Portable treestand and climbing stick system

[0001] This application is a divisional of co-pending U.S. patent application Ser. No. 15/997,463 filed Jun. 4, 2018, by the same inventors, which claims the benefit of U.S. Provisional Patent Application No. 62/548,384, filed on Aug. 21, 2017, by the same inventors, and also claims the benefit of U.S. Provisional Patent Application No. 62/622,960, filed on Jan. 28, 2018, by the same inventors, all of which are incorporated herein by reference in their respective entireties.

[0002] This invention relates generally to elevated hunting platforms, and more particularly to portable treestand systems.

[0003] Portable treestand systems have become commonplace in big game hunting. Typically, a portable treestand system includes a treestand and a plurality of climbing sticks. The treestand includes a platform, a frame, a seat, and a means for securing the treestand to a tree. The platform provides a flat base for the hunter to stand on while the seat provides a place for the hunter to sit. Typically, the platform and the seat are mounted on the bottom and top ends, respectively, of the frame. The securing means is typically some type of suitable fastener(s) (e.g., ratchet strap, chain, steel cable, rope, etc.) that secures the frame to the tree. Each climbing stick typically includes a set of steps, a set of tree engaging features, a frame, and a means (e.g., ratchet strap, chain, steel cable, rope, etc.) for securing the climbing stick to the tree. The steps are affixed to the frame to provide surfaces to grab and step on when ascending and descending the tree. The tree engaging features are also affixed to the frame to facilitate the mounting of the climbing stick to the tree.

[0004] In designing and manufacturing treestand systems, there are several factors that must be taken into consideration. For example, mobile hunters typically carry their treestand systems to their hunting locations, and it is, therefore, desirable to make the system as lightweight and compact as possible. Of course, in making the system as lightweight and compact as possible, it must also maintain a structural integrity sufficient for safe use. As another example, it is essential that the system be extremely quiet both when being mounted to a tree and also during the hunt so as not to alert game of the hunter's presence. There are several prior art treestand system designs that attempt to minimize weight. For example, treestand platforms are often formed by welding metal mesh onto square stock that has been bent into the shape of the platform. Likewise, the climbing sticks are often formed from lightweight metal tube having steps and tree engaging features welded thereon. Although such an approach can provide for a lightweight treestand system, it also suffers from undesirable noise caused by flexing materials and poor welds. In attempting to address problems associated with flexing materials and poor welds, some manufacturers have developed treestands having cast metal platforms that minimize weld points. Although cast metal platforms minimize weld points, they suffer other drawbacks. For example, cast metals are inherently brittle and, therefore, the platform has to be relatively large to compensate for the undesirable mechanical properties of cast metal. Of course, the added size results in a relatively heavy and bulky treestand. In addition, the failure of brittle materials tend to be catastrophic (e.g., shattering instead of bending), therefore causing significant safety problems.

[0005] What is needed, therefore, is a treestand system that is lighter, stronger, smaller, more silent, and/or less prone to catastrophic failure than prior treestand systems.

[0006] The present invention overcomes the problems associated with the prior art by providing a portable treestand and climbing stick system that is lighter, safer, and more versatile than prior art systems.

[0007] An example method of manufacturing a treestand includes providing a seat, providing one or more tree engaging structures, and providing a monolithic platform. The monolithic platform is formed by removing portions of a solid piece of material to form openings between a top surface of the platform and a bottom surface of the platform and to form structural supports between the openings. The seat, the one or more tree engaging structures, and the monolithic platform are combined to create a treestand.

[0008] In a specific example, the method further includes subjecting the solid piece of material to a strengthening process. In a more specific example, the solid piece of material is subjected to the material strengthening process before the step of forming openings between the top surface of the platform and the bottom surface of the platform. In an even more specific example, the solid piece of material includes aluminum.

[0009] In another specific example, the step of removing portions of the solid piece of material includes cutting the solid piece of material using a computer numerical control (CNC) system. In a more specific example, the step of removing portions of the solid piece of material includes machining the solid piece of material using a computer numerical control (CNC) system. In one specific example, the step of removing portions of the solid piece of material includes using an automated system to remove portions of the solid piece of material.

[0010] In yet another example, the step of providing one or more tree engaging structures includes removing portions of the solid piece of material to form at least one of the tree engaging structures integral with the platform as a single monolithic structure. In a more specific method, an intermediate portion of the monolithic structure between the platform and the tree engaging structure has a width, and the width of the intermediate portion of the monolithic structure is narrower than a width of the platform. The width of the intermediate portion of the monolithic structure can also be narrower than a width of the integral tree engaging structure. In an even more specific example, the method further includes providing a tubular frame structure and coupling the frame structure to the intermediate portion of the monolithic structure. The tubular frame structure has a length and a cross-sectional dimension. The width of the intermediate portion of the monolithic structure is no more than twice the cross-sectional dimension of the tubular frame structure.

[0011] Another example method further includes providing a tubular frame structure including a top end, a bottom end, and a plurality of weight reduction apertures arranged between the top end and the bottom end. The example method further includes coupling the seat to the top region of the frame structure and coupling the platform to the bottom region of the frame structure. In a more specific example, the step of coupling the platform to the bottom region of the frame structure includes providing a hinge bracket, fixably mounting the hinge bracket on the platform, and hingably coupling the frame structure to the hinge bracket.

[0012] An even more specific example further includes providing a first tensile support, a first fastener, a second tensile support, and a second fastener. The first tensile support includes a first end and a second end, and the second tensile support includes a first end and a second end. The example also includes forming a first aperture through a first peripheral sidewall of the platform. The first aperture is disposed below a top surface of the structural supports of the platform and above a bottom surface of the structural supports of the platform. The example also includes coupling the first end of the first tensile support to the first aperture with the first fastener and coupling the second end of the first tensile support to the frame structure. The example also includes forming a second aperture through a second peripheral sidewall of the platform. The second aperture is disposed below the top surface of the structural supports of the platform and above the bottom surface of the structural supports of the platform. The example also includes coupling the first end of the second tensile support to the second aperture with the second fastener and coupling the second end of the second tensile support to the frame structure.

[0013] In yet another example method, the seat is a monolithic structure formed by removing portions of a solid piece of material to form openings between a top surface of the seat and a bottom surface of the seat, forming structural supports therebetween.

[0014] Another more specific example method further includes removing a portion of the solid piece of material to form an integral bow receiving feature in the platform, providing a bow engaging device, and adjustably coupling the bow engaging device to the platform.

[0015] In another specific example method, forming the monolithic platform includes forming at least some recesses in the top surface of the platform but leaving portions of the bottom surface of the platform between adjacent structural supports formed by the recesses.

[0016] An example treestand is also described. The example treestand includes a seat, a first tree engaging structure, and a platform. The platform is coupled to the first tree engaging structure and is made of a strengthened material defining a web of structural supports that define openings between a top surface of the platform and a bottom surface of the platform.

[0017] In a particular embodiment, the strengthened material includes strengthened metal. In a more particular embodiment, the strengthened metal includes aluminum. In an even more particular embodiment, the strengthened metal includes an aluminum alloy with magnesium and silicon. In another particular embodiment, the strengthened metal is an extruded metal.

[0018] In an example embodiment, the tree engaging structure and the platform are integral parts of a monolithic structure. In a more particular embodiment, an intermediate portion of the monolithic structure between the platform and the tree engaging structure has a width, and the width of the intermediate portion of the monolithic structure is narrower than a width of the platform. The width of the intermediate portion of the monolithic structure is also narrower than a width of the tree engaging structure.

[0019] In a more particular embodiment, the treestand further includes a tubular frame having a length and a cross-sectional dimension. The frame structure is coupled to the intermediate portion of the monolithic structure, and the width of the intermediate portion of the monolithic structure is no more than twice the cross-sectional dimension of the tubular frame.

[0020] In another particular embodiment, the treestand further includes a tubular frame having a top end and a bottom end. The seat is hingably coupled to the top end of the frame, and the platform is hingably coupled to the bottom end of the frame. In a more particular example, the treestand further includes a hinge bracket hingably coupled to the frame. The hinge bracket is formed separately from, and fixed to, the platform.

[0021] In a more particular example, the treestand further includes a first tensile support, a second tensile support, a first fastener, a second fastener, a first aperture, and a second aperture. The first tensile support includes a first end and a second end. Likewise, the second tensile support includes a first end and a second end. The first aperture is disposed through a first peripheral sidewall of the platform, below a top surface of the structural supports of the platform, and above a bottom surface of the structural supports of the platform. The second aperture is disposed through a second peripheral sidewall of the platform, below the top surface of the structural supports of the platform, and above the bottom surface of the structural supports of the platform. The first end of the first tensile support is coupled to the first aperture by the first fastener, and the second end of the first tensile support is coupled to the frame structure. The first end of the second tensile support is coupled to the second aperture by the second fastener, and the second end of the second tensile support is coupled to the frame structure.

[0022] In yet another example embodiment, the seat is a monolithic structure made of a solid piece of strengthened material and includes a web of support structures defining openings between a top surface of the seat and a bottom surface of the seat.

[0023] Optionally, the treestand further includes an integral bow receiving feature defined by the platform and a bow engaging device adjustably coupled to the platform.

[0024] In yet another particular embodiment, the platform includes at least some recesses formed in the top surface of the platform but leaving portions of the bottom surface of the platform between adjacent structural supports formed by the recesses.

[0025] Example climbing sticks are also disclosed. An example climbing stick includes a frame tube, a first step, a second step, a first tree engaging structure, and a second tree engaging structure. The frame tube extends along an axis and includes a first end and a second end. The first step is mounted to the first end of the frame tube, and the second step is mounted to the second end of the frame tube. The first tree engaging structure is fixed to the first end of the frame tube, and the second tree engaging structure is fixed to the second end of the frame tube.

[0026] The frame tube includes a plurality of weight reduction apertures formed therethrough.

[0027] In an example embodiment, the frame tube includes a front wall, a first side wall, a rear wall, and a second side wall. The first side wall is disposed between the front wall and the rear wall. The second side wall is also disposed between the front wall and the rear wall, on an opposite side of the front and rear walls. The plurality of weight reduction apertures include a first plurality of apertures formed in the front wall of the frame tube. The plurality of weight reduction apertures additionally includes a second plurality of apertures formed in the first side wall of the frame tube. Apertures of the first plurality of apertures formed in the front wall of the frame tube are vertically offset with respect to adjacent apertures of the second plurality of apertures formed in the first side wall of the frame tube. In a more particular embodiment, the plurality of weight reduction apertures includes a third plurality of apertures passing through the rear wall of the frame tube. Apertures of the first plurality of apertures are vertically aligned with corresponding apertures of the third plurality of apertures. The plurality of weight reduction apertures includes a fourth plurality of apertures passing through the second side wall of the frame tube. Apertures of the second plurality of apertures are vertically aligned with corresponding apertures of the fourth plurality of apertures.

[0028] In an even more particular embodiment, the climbing stick is configured to stack on a second climbing stick in a substantially horizontally aligned position, when the frame tube of the climbing stick and the frame tube of the second climbing stick are oriented horizontally. An example climbing stick is configured to engage a second climbing stick in an aligned position, with corresponding features of the climbing stick and the second climbing stick substantially aligned along an axis perpendicular to the axis of the frame tube of the climbing stick and to a corresponding axis of a frame tube of the second climbing stick. In a more particular example, the first tree engaging structure includes a frame engaging feature configured to engage the frame tube of the second climbing stick. The first step includes a restraining feature facilitating the engagement of the frame tube by a tree engaging structure of a third climbing stick and limiting relative motion between the climbing stick and the third climbing stick. The second tree engaging structure includes a frame engaging feature configured to engage the frame tube of the second climbing stick. The second step includes a restraining feature facilitating the engagement of the frame tube by a second tree engaging structure of the third climbing stick and limiting relative motion between the climbing stick and the third climbing stick.

[0029] In yet another particular example, a portion of each of the first and second steps is configured to receive a respective tree engaging structure of another climbing stick. In a more particular example, the portions of the steps each includes a restraining feature configured to prevent the tree engaging structures of the other climbing stick from sliding along the frame tube.

[0030] In one particular embodiment, at least one of said tree engaging structures includes a first tooth and a second tooth. The first tooth and the second tooth are adapted to bite into a tree, and the first tooth and the second tooth are configured together to receive a frame tube of the other climbing stick therebetween.

[0031] Optionally, at least one of the tree engaging structures defines a channel configured to seat the frame tube. The channel prevents rotation of the tree engaging structure(s) relative to the frame tube, when the tree engaging structure(s) is/are fixed to the frame tube.

[0032] A method of manufacturing a climbing stick is also disclosed. The method includes providing a frame tube, a first step structure, a second step structure, a first tree engaging structure, and a second tree engaging structure. The frame tube includes a first end, a second end, and a plurality of weight reduction apertures between the first end and the second end. The method further includes mounting the first step structure to the first end of the frame tube, mounting the second step structure to the second end of the frame tube, mounting the first tree engaging structure to the first end of the frame tube, and mounting the second tree engaging structure to the second end of the frame tube.

[0033] In a particular embodiment, the frame tube includes a front wall, a first side wall, a rear wall, and a second side wall. The first side wall is disposed between the front wall and the rear wall. The second side wall is disposed between the front wall and the rear wall, opposite the first side wall. The plurality of weight reduction apertures include a first plurality of apertures formed in the front wall of the frame tube. The plurality of weight reduction apertures additionally includes a second plurality of apertures formed in the first side wall of the frame tube. Apertures of the first plurality of apertures formed in the front wall of the frame tube are vertically offset with respect to adjacent apertures of the second plurality of apertures formed in the first side wall of the frame tube. In a more particular example, the plurality of weight reduction apertures includes a third plurality of apertures passing through the rear wall of the frame tube. Apertures of the first plurality of apertures are vertically aligned with corresponding apertures of the third plurality of apertures. In addition, the plurality of weight reduction apertures includes a fourth plurality of apertures passing through the second side wall of the frame tube, and apertures of the second plurality of apertures are vertically aligned with corresponding apertures of the fourth plurality of apertures.

[0034] An example method further includes configuring the climbing stick to stack on a second climbing stick in a substantially horizontally aligned position, when the frame tube of the climbing stick and the frame tube of the second climbing stick are oriented horizontally. A more particular example method includes configuring the climbing stick to engage a second climbing stick in an aligned position, with corresponding features of the climbing stick and the second climbing stick substantially aligned along an axis perpendicular to the axis of the frame tube of the climbing stick and a corresponding axis of a frame tube of the second climbing stick. In an even more particular example method, the first tree engaging structure includes a frame engaging feature configured to engage the frame tube of the second climbing stick. In addition, the first step includes a restraining feature facilitating the engagement of the frame tube by a tree engaging structure of a third climbing stick and limiting relative motion between the climbing stick and the third climbing stick. The second tree engaging structure includes a frame engaging feature configured to engage the frame tube of the second climbing stick. The second step includes a restraining feature facilitating the engagement of the frame tube by a second tree engaging structure of the third climbing stick and limiting relative motion between the climbing stick and the third climbing stick.

[0035] In yet another particular method, a portion of each of the first step and the second step is configured to receive a respective tree engaging structure of another climbing stick. In a more particular example embodiment, the portions of the steps each include a restraining feature configured to prevent the tree engaging structures of another climbing stick from sliding along the frame tube.

[0036] In another particular method, the tree engaging structure includes a first tooth and a second tooth. The first tooth and the second tooth are adapted to bite into a tree. In addition, the first tooth and the second tooth are configured together to receive a frame tube of another climbing stick therebetween.

[0037] In another example method, the first tree engaging structure and the second tree engaging structure each defines a channel configured to seat the frame tube. The frame tube is seated in the channel, and the channel prevents rotation of the tree engaging structure relative to the frame tube, when the tree engaging structure is fixed to the frame tube.

[0081] The present invention overcomes the problems associated with the prior art, by providing a more portable treestand and climbing stick system. In the following description, numerous specific details are set forth (e.g., material types, fastener types, etc.) in order to provide a thorough understanding of the invention. Those skilled in the art will recognize, however, that the invention may be practiced apart from these specific details. In other instances, details of well-known manufacturing practices (e.g., extruding, welding, etc.) and components have been omitted, so as not to unnecessarily obscure the present invention.

[0082] FIG. 1 shows a perspective view of a portable treestand and climbing stick system 100 mounted on a tree 102. System 100 includes a treestand 104, a plurality of climbing sticks 106, and a plurality of cam straps 108. Treestand 104 is configured to be mounted up in a tree to provide a user with a secure structure to stand and sit on. Treestand 104 is shown deployed and fastened to tree 102 with two of straps 108. Climbing sticks 106 are configured to be removably mounted to tree 102 so that a user can climb into, and out of, treestand 104. Each of climbing sticks 106 is secured to tree 102 with a respective one of straps 108. Straps 108 are, for example, lightweight nylon cam straps having an adjustable length to accommodate for trees having varying trunk diameters. Each end of strap 108 includes a closed loop adapted to easily engage and disengage small posts structures of treestand 104 and/or climbing sticks 106.

[0083] FIG. 2 shows a perspective view of system 100 in a stowed position, with treestand 104 in a collapsed position and four of sticks 106 stacked and secured to treestand 104 with a set of bungee cords 200. Alternatively, bungee cords 200 can be omitted and sticks 106 can be secured to treestand 104 using straps 108. Although not shown, backpack straps can be fastened to the bottom of treestand 104, so that system 100 can be carried on the back of a user.

[0084] FIG. 3 shows an exploded perspective view of treestand 104 according to one embodiment of the present invention. Treestand 104 includes a platform 300, a hinge bracket 302, a frame 304, a cable assembly 306, a seat assembly 308, a tree engaging structure 310, and a set of posts 312.

[0085] Platform 300 provides a relatively planar surface upon which a user can stand when treestand 104 is deployed and secured to a tree.

[0086] Bracket 302 facilitates the pivoting of platform 300 with respect to frame 304. Bracket 302 is seated and fixed in a recess 314 of platform 300. In the example embodiment, bracket 302 is fixed directly to platform 300 with a set of screws 317.

[0087] Frame 304 provides structural support to treestand 104 and is hingably connected to bracket 302 with a bolt 316 and a nut 318. A set of oil-infused nylon washers 320 are disposed between bracket 302 and frame 304, to eliminate metal-on-metal contact therebetween. By eliminating metal-on-metal contact, noise is minimized when platform 300 is pivoted with respect to frame 304.

[0088] Cable assembly 306 provides tensile support to platform 300 when treestand 104 is deployed. Cable assembly 306 includes a set of steel cables 322, each having a first end 324 and a second end 326. Each of first ends 324 is fastened to platform 300 with a respective bolt 328 and a nut 330. Second ends 326 are adjustable secured to frame 304 with an adjustable shaft assembly 332, which facilitates the leveling of platform 300 with respect to frame 304.

[0089] Seat assembly 308 includes a seat 334 and a leveling system 336. Seat 334 is hingably connected to frame 304 with a bolt 338 and a nut 340. A second set of oil-infused nylon washers 342 are disposed between seat 334 and frame 304, to eliminate metal-on-metal contact therebetween. Leveling system 336 facilitates the leveling of seat 334 with respect to frame 304. A polymer pad 344 is attached to frame 304 and is adapted to abut leveling system 336.

[0090] In the example embodiment, treestand 104 further includes a bow engaging device 346 and polymer pad 348 for securing a bow (i.e., an archery bow) to platform 300. Bow engaging device 346 is adjustably secured to platform 300 with two set screws 350. Polymer pad 348 provides a soft surface that abuts the limb of the bow.

[0091] Tree engaging structure 310 is mounted to the rear side of frame 304, to facilitate the mounting of treestand 104 to a tree. Tree engaging structure 310 is configured to bite into the tree, to prevent treestand 104 from slipping against the tree. Furthermore, tree engaging structure 310 is adapted engage trees of varying sizes and also helps to secure frame 304 in a vertical position when treestand 104 is mounted to a section of a tree that is not exactly vertical. Tree engaging structure 310 is mounted directly to frame 304 with a bolt 352 and a complementary nut 354.

[0092] Posts 312 provide a structure onto which end loops of straps 108 are positioned when securing treestand 104 to a tree. Each of posts 312 is attached to frame 304 with a respective bolt 356 and complementary nut 358. In this example, each of posts 312 is machined from black DELRIN™ polymer.

[0093] FIG. 4A is a perspective view of platform 300, which is a monolithic structure. In the example embodiment, platform 300 is computer numeric control (CNC) machined from a single solid plate of 6061 aluminum alloy. Before platform 300 is cut from the solid plate, the plate is subjected to pre strengthening and/or toughening processes including, but not limited to, metal working processes (e.g., cold working/rolling, hot working/rolling, extrusion, forging, etc.) and/or temperature treatment processes (e.g., tempering, annealing, quenching, case hardening, precipitation strengthening, normalizing, etc.). Because the plate is subjected to one or more of such processes, platform 300 has several advantages over prior art cast platforms. For example, platform 300 is lighter than cast platforms because the plate from which platform 300 is cut is pre-strengthened/toughened, thus requiring less material to support the same load. Another reason for this is that platform 300 is more ductile than a cast platform and, therefore, not as susceptible to sudden, catastrophic fracture. Because treestands support people at relatively high elevations, sudden fracture of a brittle platform is highly undesirable. To avoid such catastrophic failures, cast platforms have to be over-engineered. Platform 300, however, is more ductile and tough and, therefore, much more likely to deform (e.g., bend) before failing (e.g., shattering). This allows platform 300 to have a much more relaxed safety factor. Indeed, platform 300 is lighter, stronger, and safer than larger platforms that are cast from similar metals and designed to support the same load.

[0094] Platform 300 includes a plurality of peripheral sidewalls 400, a plurality of structural supports 402, and a tree engaging feature 404.

[0095] In the example embodiment, the height of peripheral sidewalls 400 is the same as the thickness of the plate from which platform 300 is cut from. The left and right portions of sidewalls 400 each define a respective aperture 406 passing completely therethrough. Each of apertures 406 is adapted to receive a respective one of bolts 328 to facilitate the fastening of cables 322 to platform 300. Because apertures pass through sidewalls 400, no upward projections are required to connect cables 322 to platform 300, thereby reducing the required thickness of the metal plate from which platform 300 is cut.

[0096] Structural supports 402 define a plurality openings 408 therebetween. Openings 408 pass completely through platform 300 such that structural supports 402 are arranged in a web configuration. The web configuration is intentionally irregular shaped so that platform 300 blends in with irregular shaped surrounding structures such as branches, limbs, etc. This provides a camouflage effect and prevents game from noticing the presence of treestand 104. As shown, the height of supports 402 is slightly less than the thickness of the plate from which platform 300 is formed. Each of supports 402 includes a plurality of channels 410, machined therein, to provide additional traction and prevent the foot of a user from slipping on platform 300. Structural supports 402 also define an integral bow receiving feature 412, which receives the bottom limb and cam of a compound bow. The structural supports 402 defining bow receiving feature 412 include a plurality of threaded apertures 414 passing therethrough. Apertures 414 are threaded to receive set screws 350 of bow engaging device 346. The number of apertures 414 allow bow engaging device 346 to be adjustably positioned at any two of apertures 414 to compensate for different sized bows. Furthermore, apertures 414 are positioned on both sides of bow receiving feature 412 thus allowing bow engaging device 346 to be set up for either left or right handed bows/hunters.

[0097] Tree engaging feature 404 is an integral part of platform 300 and facilitates the mounting of treestand 104 to a tree. Feature 404 is angled to accommodate for varying width trees and defines a plurality of teeth 416 configured to grip/bite into the side of a tree when treestand 104 is fastened thereto.

[0098] Recess 314 is formed in an intermediate portion 417 of platform 300, disposed between tree engaging feature 404 and the web of support structures 402. Because platform 300 is machined from a single piece of pre-strengthened/toughened metal, the width of intermediate portion can be significantly narrowed, resulting in substantial weight reduction. Indeed, in this example embodiment, intermediate portion 417 is only slightly (e.g., 10%) wider than recess 314 and significantly less than twice the cross-sectional dimension of tubular frame 304.

[0099] In the example embodiment, platform 300 further includes a plurality of recesses 418 that do not pass completely through platform 300. Retaining a thin portion of the bottom surface of platform 300 within the recesses 418 provides significant weight reduction while still maintaining a high structural strength immediately adjacent intermediate portion 417.

[0100] FIG. 4B shows a rear perspective view of platform 300. As shown, two of the four recesses 418 (shown in FIG. 4A) include hoof-shaped openings 420 passing completely therethrough. The hoof-shaped openings resemble deer tracks and are considered to be aesthetically pleasing to hunters.

[0101] FIG. 5 shows an exploded perspective view of bow engaging device 346, which includes a body 500, a pair of set screws 502, a polymer tube 504, and a hex screw 506. Body 500 is a generally c-shaped metal structure defining a channel 508, a set of threaded apertures 510, and another threaded aperture 512. Channel 508 is configured to receive a structural support 402 of platform 300. Threaded apertures 510 receive set screws 350. During the mounting of body 500 to one of structural supports 402, apertures 510 are coaxially aligned with a selected pair of apertures 414. Once aligned, each of screws 502 is threaded into both a respective aperture 510 and a respective aperture 414, thereby fastening body 500 to platform 300. Accordingly, apertures 414 and 510 have the same thread specifications. Threaded aperture 512 receives screw 506. Before screw 506 is threaded into aperture 512, tube 504 is disposed around the shaft of screw 506. Tube 504 provides a relatively soft surface that effectively engages a bow without damaging it and/or causing noise.

[0102] FIG. 6 shows a close-up perspective view of bow engaging device 346 and polymer pad 348 attached to platform 300.

[0103] FIG. 7 is a cross-sectional view of platform 300 taken along line A-A of FIG. 6 wherein a bow 700 is shown seated in bow receiving feature 412. As shown, pad 348 abuts the bottom limb 702 of bow 700 while tube 504 abuts a cam 704 and a string 706 of bow 700. The center of mass of bow 700 is in front of pad 348 and, therefore, bow 700 has a tendency to lean forward (to the left in FIG. 7). Bow 700 is prevented from tipping forward by the downward force exerted on cam 704 by tube 504.

[0104] FIGS. 8A-8D show plan views of the front wall 800, right side wall 802, rear wall 804, and left side wall 806, respectively, of frame 304. In the example embodiment, frame 304 is formed from a section of extruded aluminum square tube.

[0105] Front wall 800 of frame 304, shown in FIG. 8A, includes a first set of apertures 808, a second aperture 810, and a plurality of weight reduction apertures 812, all passing completely therethrough. Apertures 808 provide passages through which bolts 356 are disposed to mount posts 312 to frame 304. Aperture 810 provides a passage through which bolt 352 is disposed to mount tree engaging structure 310 to frame 304. Apertures 812 reduce the overall weight of frame 304 while also making it more difficult for animals to see frame 304, when treestand 104 is mounted in a tree. In this example, each of apertures 812 includes a 45 degree chamfer, which further reduces the weight of frame 304.

[0106] The right side wall 802 of frame 304, shown in FIG. 8B, includes a first aperture 814, a second aperture 816, a slotted cutout 818, and additional weight reduction apertures 812, all passing completely therethrough. Aperture 814 provides a passage through which bolt 316 is disposed to hingably mount frame 304 to bracket 302. Aperture 816 provides a passage through which bolt 338 is disposed to hingably mount seat 334 to frame 304. Cutout 818 provides multiple downward angled channels that allow a user to optionally change the vertical position of adjustable shaft assembly 332, which connects cables 322 to frame 304 (FIG. 3). The vertical position of adjustable shaft assembly 332, therefore, dictates the angle of platform 300 with respect to frame 304. For example, if treestand 104 is mounted in a rear leaning tree, platform 300 can be leveled by moving adjustable shaft assembly 332 to a lower one of the downward angled channels, thereby increasing the angle between platform 300 and frame 304.

[0107] Rear wall 804 is similar to front wall 800. The only difference being that rear wall 804 includes apertures 820, which are coaxially aligned with apertures 808, respectively, but are much larger. The larger diameter of apertures 820 allow a tool (e.g. socket) to pass through rear wall 804 during the fastening of nuts 358 onto bolts 356 (FIG. 3). As shown, aperture 810 passes through both front wall 800 and rear wall 804.

[0108] Left side wall 806 is a mirror reflection of right side wall 802. As shown, aperture 814, aperture 816, slotted cutout 818, and weight reduction apertures 812 pass completely through both right side wall 802 and left sidewall 806.

[0109] One advantageous aspect of this example embodiment is that weight reduction apertures 812 are offset between adjacent walls. For example, the vertical center points of apertures 812 formed through front wall 800 and rear wall 804 are located halfway between the vertical center points of apertures 812 formed through right side wall 802 and left side wall 806. This offset allows the maximum number of weight reduction apertures 812 to be formed in frame 304, while sacrificing only minimal structural strength.

[0110] FIG. 9 shows an exploded perspective view of seat assembly 308. In the example embodiment, seat 334 is a monolithic structure formed from a single solid plate of 6061 aluminum alloy. Before seat 334 is cut from the solid plate, the plate is subjected to a strengthening process. This allows seat to be stronger and lighter than prior art seats. As a result, seat 334 can be made thinner and lighter than prior art seats.

[0111] Seat 334 includes a plurality of structural supports 900, a set of threaded apertures 902, and a set of smooth apertures 904. Structural supports 900 are similar to structural supports 402 of platform 300 in that they define a plurality openings 906 therebetween. Openings 906 pass completely through seat 334, so that structural supports 900 are arranged in a web configuration. This allows seat 334 to be as light as possible while still having sufficient structural strength to support a user seated thereon, when treestand 104 is mounted in a tree. Threaded apertures 902 are adapted to receive a set of screws 908 which fasten leveling system 336 to the rear surface of seat 334. Smooth apertures 904 are adapted to receive the smooth exterior shaft of bolt 338 so as to hingably couple seat 334 to frame 304. Accordingly, apertures 904 coaxially align with aperture 816 of frame 304.

[0112] Leveling system 336 provides a means for changing the angle between seat 334 and frame 304, to accommodate for non-vertical trees and/or user preference. Leveling system 336 includes a bracket 910 and a screw 912. Bracket 910 includes a set of apertures 914 and a threaded aperture 916. Apertures 914 are adapted to receive screws 908 and facilitate the mounting of bracket 910 to seat 334. Aperture 916 is adapted to receive screw 912 such that threading screw 912 into aperture 916 causes the angle between seat 334 and frame 304 to increase. Oppositely, loosening screw 912 causes the angle between seat 334 and frame 304 to decrease. The tip of screw 912 urges against polymer pad 344 when a user sits in seat 334.

[0113] FIG. 10 shows a top view of tree engaging structure 310 removed from frame 304. Tree engaging structure 310 is an aluminum structure formed, for example, by first extruding the antler-shaped profile along an axis into a beam format and then cutting the beam perpendicular to the axis. Accordingly, a single beam yields multiple tree engaging structures 310.

[0114] Tree engaging structure 310 includes a channel 1000, an aperture 1002, a set of outside teeth 1004, a set of middle teeth 1006, and a set of inside teeth 1008. Channel 1000 is adapted to seat frame 304, to prevent tree engaging structure 310 from rotating about bolt 352 (FIG. 3). Channel 1000 is defined by a first surface 1010, a second surface 1012, and a third surface 1014. When tree engaging structure 310 is mounted to frame 304, first surface 1010 engages rear wall 804 of frame 304, second surface 1012 engages right sidewall 802 of frame 304, and third surface 1014 engages left sidewall 806 of frame 304. Aperture 1002 is adapted to receive bolt 352 and coaxially aligns with aperture 810 of frame 304. Teeth 1004, 1006, and 1008 are configured to bite into the bark of a tree. In the example embodiment, the points of teeth 1004 and 1006 are coplanar while the points of teeth 1008 are slightly set back closer to channel 1000. During the mounting of treestand 104 to a tree, only two of the six teeth 1004, 1006, and 1008 need to bite into the tree. The number and configuration of teeth 1004, 1006, and 1008 is such that tree engaging structure 310 can engage various size and shaped trees. This is beneficial in that tree engaging structure 310 can engage angled trees while still securing frame 304 in a vertical upright position. Optionally, teeth 1004 can be made sharper than teeth 1006, so that teeth 1004 can penetrate deeper into a tree than teeth 1006, to accommodate the round contour of a non-vertical tree, while maintaining treestand 104 in a substantially level position.

[0115] FIG. 11 shows a perspective view of hinge bracket 302 fixed to platform 300 according to another embodiment of the present invention. In this particular embodiment, bracket 302 is fixed to platform 300 via a weld joint 1100 rather than by screws 317.

[0116] FIGS. 12A-12C show side views of treestand 104 as it is transitioned from a deployed position to a collapsed position. More specifically, FIG. 12A shows a side view of treestand 104 in a deployed position, FIG. 12B shows a side view of treestand 104 transitioning from a deployed position to a collapsed position, and FIG. 12C shows a side view of treestand 104 in a collapsed position.

[0117] FIG. 13 illustrates forming of platform 300 from a solid plate 1300 of 6160 aluminum alloy. In this example, plate 1300 is strengthened/toughened before it is CNC machined into the shape of platform 300.

[0118] FIG. 14 illustrates forming of seat 334 from a solid plate 1400 of 6160 aluminum alloy. In this example, plate 1400 is CNC machined into the shape of seat 334.

[0119] FIG. 15 illustrates the forming of multiple platforms 300 and seats 334 from a single solid 6061 aluminum plate. By forming multiple platforms 300 and seats 334 from a single plate 1500, there is less scrap aluminum plate as compared to forming each part from a separate plate. This is because the platforms 300 and seats 334 can be collectively arranged to more efficiently occupy plate real-estate.

[0120] In the example embodiments shown in FIGS. 13-15, platform 300 and seat 334 are machined (milling, drilling, etc.) from plates using a CNC machine. However, other cutting means can be implemented in place of machining. For example, platform 1300 and seat 334 can be cut from a plate using other processes including, but not limited to, water jet cutting, plasma cutting, flame cutting, laser cutting, stamping/punching, drilling, and/or any other manufacturing process for removing material. Such alternate cutting processes can optionally be automated, using CNC or other systems, or manual.

[0121] FIG. 16 is a perspective view of a platform 1600 according to an alternate embodiment of the present invention. Platform 1600 is substantially similar to platform 300 of treestand 100, except that platform 1600 includes an antler-shaped tree engaging feature 1602. Indeed, platform 1600 can be used in place of platform 300 in treestand 104. Features of platform 1600 that are identical to those of platform 300 are denoted with like reference numbers and their descriptions are withheld from the description of FIG. 16 to avoid redundancy.

[0122] Antler-shaped tree engaging feature 1602 (as well as tree engaging structure 310 shown in FIG. 10) includes both functional and ornamental features. In particular, the shape of tree engaging feature 1602 resembles the antlers (rack) of a deer and is, therefore, thought to be aesthetical pleasing to hunters. In addition, the tines of the antler design are effective to penetrate the bark of a tree and prevent unwanted movement with respect to the tree.

[0123] FIG. 17 is a perspective view of a climbing treestand 1700 according to another alternate embodiment of the present invention. Treestand 1700 includes a platform assembly 1702 and a seat assembly 1704, both of which are configured to be fastened to a tree. Platform assembly 1702 includes a platform 1706 and an adjustable strap assembly 1708 coupled thereto. Platform 1706 includes an integral tree engaging feature 1710. Seat assembly 1704 includes a seat 1712 and an adjustable strap assembly 1714 coupled thereto. Seat 1712 also includes an integral tree engaging feature 1716. Platform 1706 and seat 1712 are each machined from a solid plate (either the same plate or different plates) of aluminum alloy or other pre-strengthened metal.

[0124] FIG. 18 shows a top view of an alternate tree engaging structure 1800 for use with treestand 104. Tree engaging structure 1800 includes a channel 1802, an aperture 1804, a set of outside teeth 1806, a set of middle teeth 1808, and a set of inside teeth 1810. Channel 1802 is adapted to receive/seat frame 304 to prevent tree engaging structure 1800 from rotating about bolt 352. Channel 1802 is defined by a first surface 1812, a second surface 1814, and a third surface 1816. When tree engaging structure 1800 is mounted to frame 304, first surface 1812 engages rear wall 804 of frame 304, second surface 1814 engages right sidewall 802 of frame 304, and third surface 1816 engages left sidewall 806 of frame 304. Aperture 1804 is adapted to receive bolt 352 and coaxially aligns with aperture 810 of frame 304. Teeth 1806, 1808, and 1810 are configured to bite into the bark of a tree. In the example embodiment, the points of teeth 1806 and 1808 are coplanar while the points of teeth 1810 are slightly set back closer to channel 1802. It is important to note that outside teeth 1806 are substantially sharper than middle teeth 1808. Therefore, outside teeth 1806 can bite deeper into the tree than do middle teeth 1808. Because outside teeth 1806 bite deeper into the tree, tree engaging structure 1800 can engage substantially angled trees while still securing frame 304 in a vertical upright position.

[0125] FIG. 19 is a flowchart summarizing an example method 1900 of manufacturing a treestand. In a first step 1902, a seat is provided. Then, in a second step 1904, a tree engaging structure is provided. Next, in a third step 1906, a monolithic platform is provided. Finally, in a fourth step 1908, the seat, tree engaging structure, and the monolithic platform are combined to form a treestand.

[0126] FIG. 20 is a flowchart summarizing an example method 2000 of performing third step 1906 (provide monolithic platform) of method 1900. In a first step 2002, a solid piece of material (e.g., pre-strengthened or pre-toughened metal) is provided. Then, in a second step 2004, portions of the solid piece of material are removed to form openings between a top and bottom surface of the platform defining structural supports therebetween.

[0127] FIG. 21 shows an exploded perspective view of one of climbing sticks 106. Climbing stick 106 includes a set of step structures 2100, a set of feet 2102, a post 2104, and a set of end caps 2106 coupled to a frame 2108. Step structures 2100 provide a surface for a user to grab and stand on when ascending and descending a tree via climbing stick 106. Feet 2102 are essentially tree engaging structures which are configured to bite into a tree to maintain a fixed relationship between climbing stick 106 and the tree. Post 2104 provides a structure for a strap 108 (shown in FIG. 1) to engage when securing climbing stick 106. End caps 2106 are disposed in opposite ends of frame 2108 for aesthetic purposes and to cover the sharp edges of frame 2108. Frame 2108 is a tubular structure with a square cross-section, and provides the main structure to which all other components of climbing stick 106 are mounted.

[0128] Each of step structures 2100 is fixably mounted to frame 2108 by a top bolt 2110, a top nut 2112, a bottom bolt 2114, and a bottom nut 2116. Bolts 2110 are coaxially disposed through a top aperture 2118 of step structure 2100, an aperture 2120 of frame 2108, and finally through nut 2112. Bolts 2114 also facilitate the mounting of step structures 2100 and feet 2102 to frame 2108. Bolts 2114 are coaxially disposed through a bottom aperture 2124 of step structures 2100, an aperture 2126 of frame 2108, aperture 2122 of feet 2102 and finally through nut 2116.

[0129] Post 2104 provides a structure onto which each loop of a strap 108 engages during the mounting of climbing stick 106 to a tree. Post 2104 is mounted to frame 2108 with a bolt 2128 and nut 2130. More specifically, bolt 2128 is disposed through an aperture 2132 of post 2104, an aperture 2134 of frame 2108, and finally through nut 2130.

[0130] FIG. 22 shows a rear perspective view of one of step structures 2100. In addition to apertures 2118 and 2124, step structure 2100 further includes a channel 2200, a set of protrusions 2202, a plurality of grooves 2204, two slots 2206, and a plurality of weight reduction apertures 2208. Channel 2200 is adapted to receive and seat the outer surface of frame 2108 so as to distribute the forces exerted by step structure 2100 on bolts 2110, 2114, and frame 2108, when a user stands on step structure 2100. Channel 2200 also prevents relative movement (e.g., rotational and/or translational movement) between step structure 2100 and frame 2108. Protrusions 2202 also engage opposite sides of frame 2108 to resist the torque exerted on step structure 2100 when a user stands on step structure 2100. Protrusions 2202 also function as restraining features configured to prevent the tree engaging structures of another climbing stick from sliding along frame 2108 when climbing sticks 106 are stacked onto one another. Slots 2206 allow feet 2102 of other climbing sticks 106 to engage frame 2108, when stacking climbing sticks 106 onto one another. Grooves 2204 provide traction to the boot of a user standing on step structure 2100, and apertures 2208 reduce the weight of step structures 2100 without sacrificing significant structural strength.

[0131] FIG. 23 shows a rear view of one of step structures 2100. As shown, each side 2300 of step structure 2100 is slightly pitched upward at an angle of twelve degrees with respect to the horizontal. This provides additional grip between the boot of a user and step structure 2100. In the example embodiment, each of step structures 2100 is formed first extruding an aluminum beam having a cross-sectional profile as shown in FIG. 23. Then, the beam is cut perpendicularly with respect to the extrusion axis of the beam. Finally, channel 2200 is machined into each step structure 2100.

[0132] FIG. 24 shows a top plan view of one of feet 2102. Each of feet 2102 further includes a plurality of antler-shaped teeth 2400, a channel 2402, apertures 2404, and a channel 2406. Teeth 2400 are configured to bite into the outer surface of a tree to facilitate the mounting of climbing stick 106 to the tree. Channel 2402 is adapted to receive the outer surface of frame 2108 to prevent relative rotation of feet 2102 with respect to frame 2108. That is, each side 2408 of channel 2402 engages a respective opposite side of frame 2108. Apertures 2404 reduce the overall weight of climbing sticks 106. Channel 2406 is a frame engaging feature that is adapted to receive the frame 2108 of another climbing stick 106, when climbing sticks 106 are stacked on one another. The stacking of climbing sticks 106 will be shown in greater detail in FIG. 26.

[0133] FIGS. 25A-25D show plan views of the front wall 2500, right side wall 2502, rear wall 2504, and left side wall 2506, respectively, of frame 2108. In the example embodiment, frame 2108 is formed from a section of extruded aluminum square tube.

[0134] Front wall 2500 of frame 2108 shown in FIG. 25A includes apertures 2120, apertures 2126, aperture 2134 and a plurality of weight reduction apertures 2508, all passing completely therethrough. Apertures 2120 provide passages through which bolts 2110 are disposed to mount step structures 2100 to frame 2108. Apertures 2126 provides a passage through which bolts 2114 are disposed to mount step structures 2100 to frame 2108 and to also mount feet 2102 to frame 2108. Aperture 2134 receives bolt 2128 to mount post 2104 to frame 2108. Apertures 2508 reduce the overall weight of frame 2108 while also making it more difficult for animals to see frame 2108 when climbing sticks 106 are mounted to a tree. In this example, each of apertures 2508 includes a 45 degree chamfer, which further reduces the weight of frame 2108.

[0135] The right side wall 2502 of frame 2108 shown in FIG. 25B also includes a plurality of chamfered weight reduction apertures 2508.

[0136] Rear wall 2504 is similar to front wall 2500, except that rear wall 2504 includes apertures 2510 and 2512. Apertures 2510 and 2512 are coaxially aligned with apertures 2120 and 2134, respectively, but are larger. The larger diameter of apertures 2510 and 2512 allow a tool (e.g. socket) to pass through rear wall 2504 during the fastening of nuts 2116 and 2130 onto bolts 2110 and 2128, respectively. As shown, apertures 2126 pass through both front wall 2500 and rear wall 2504.

[0137] Left side wall 2506 is identical to right side wall 2500 and is, therefore, not explained in detail to avoid redundancy.

[0138] One important aspect of example climbing stick 106 is that weight reduction apertures 2508 are offset with respect to apertures 2508 on adjacent walls. For example, the vertical center points of apertures 2508 formed through front wall 2500 and rear wall 2504 are located halfway between the vertical center points of apertures 2508 formed through right side wall 2502 and left side wall 2506. This offset allows an increased number of weight reduction apertures 2508 to be formed in frame 2108, while sacrificing only minimal structural strength.

[0139] FIG. 26 shows a top plan view of climbing sticks 106 being stacked onto one another. As shown, each of channels 2406 is adapted to engage the frame 2108 of an underlying one of climbing sticks 106.

[0140] FIG. 27 shows a side view of climbing sticks 106 being stacked onto one another. Climbing sticks 106 are configured to stack on to one another in a substantially horizontally aligned position, when frames 2108 are oriented horizontally. In other words, climbing sticks 106 are configured to engage one another in an aligned position such that corresponding features of climbing sticks 106 are substantially aligned along an axis 2700. Axis 2700 is perpendicular to an axis 2702 of frame 2108, as well as to the axes of the other stacked frames 2108. In this example, climbing sticks 106 stack directly on top of one another such that bolts 2114 of each respective one of climbing sticks 106 are substantially coaxially aligned with one another within a predetermined tolerance. Horizontal alignment provides an important advantage by reducing the size (e.g., the width in FIG. 27) of the stack of climbing sticks 106, making the stack of climbing sticks 106 easier to carry through thick, tangled brush.

[0141] FIG. 28 shows a perspective view of one of climbing sticks 106 being stacked onto another one of climbing sticks 106. When stacked, channel 2406 of the top climbing stick 106 engages the portion of frame 2108 that is exposed by slots 2116 of step 2000 of the underlying climbing stick 106. Protrusions 2202 of the underlying climbing stick 106 engage the tree engaging structure 2102 of the climbing stick 106 stacked thereon, thereby preventing the top climbing stick 106 from sliding along frame 2108 of the underlying climbing stick 106.

[0142] FIG. 29 shows a perspective view of an alternate climbing stick 2900. Climbing stick 2900 includes a frame 2902, a post 2904, and a pair of step structures 2906. Post 2904 provides a structure that straps 108 can engage, when mounting climbing stick 2900 in a tree. Post 2904 is mounted to frame 2902 with a bolt 2908. Each of step structures 2906 is mounted at an opposite end of frame 2902 with a respective bolt 2910.

[0143] FIG. 30 shows a perspective view of one of step structures 2906 removed from frame 2902. Step structure 2906 includes an integral tree engaging feature 3000, a frame receiving aperture 3002, a bolt receiving aperture 3004, and a step feature 3006. Tree engaging feature 3000 is configured to bite into a tree and to facilitate the stacking of climbing sticks 2900 onto one another. Frame receiving aperture 3002 is configured to receive an end of frame 2902. Aperture 3004 passes completely through step structure 2906 such that bolt 2910 can be disposed simultaneously through both step structure 2906 and frame 2902. Step structure 2906 is a monolithic structure including tree engaging feature 3000 and step feature 3006 as integral parts thereof. The monolithic nature of step structure 2906 provides important advantages including, but not limited to, simpler assembly, fewer parts, improved stability, and increased strength.

[0144] FIG. 31 shows a perspective view of another alternate climbing stick 3100. Climbing stick 3100 includes a frame 3102, a post 3104, and a pair of step structures 3106. Post 3104 provides a structure which straps 108 can engage, when mounting climbing stick 3100 to a tree. Post 3104 is mounted to frame 3102 with a bolt 3108. Each of step structures 3106 is mounted at an opposite end of frame 3102 with a respective bolt 3110.

[0145] FIG. 32 shows a perspective view of one of step structures 3106 removed from frame 3102. Step structure 3106 includes an integral tree engaging feature 3200, a frame receiving protrusion 3202, a bolt receiving aperture 3204, and a step feature 3206. Tree engaging feature 3200 is configured to bite into a tree and to facilitate the stacking of climbing sticks 3100 onto one another. Frame receiving protrusion 3202 is adapted to slide into and fit closely within an end of frame 3102. Aperture 3204 passes completely through protrusion 3202 such that bolt 3110 can be disposed simultaneously through both step structure 3100 and frame 3102. Step structure 3106 is a monolithic structure including tree engaging feature 3200 and step feature 3206 as integral parts thereof. The monolithic nature of step structure 3106 provides important advantages similar to step structure 2906 of FIG. 30.

[0146] FIG. 33 is a flowchart summarizing a method 3300 of manufacturing a climbing stick. In a first step 3302, a frame tube is provided. Then, in a second step 3304, weight reduction apertures are formed in the frame tube. Next, in a third step 3306, a step structure is provided. Then, in a fourth step 3308, the step structure is coupled to the frame tube. Next, in a fifth step 3310, a tree engaging structure is provided. Finally, in a sixth step 3312, the tree engaging structure is coupled to the frame tube. Optionally, the step structure and tree engaging feature are integral parts of a monolithic structure, and fourth step 3308 and sixth step 3313 are performed simultaneously.

[0147] The description of particular embodiments of the present invention is now complete. Many of the described features may be substituted, altered or omitted without departing from the scope of the invention. For example, alternate treestand and/or climbing stick mounting straps (e.g. rope), may be substituted for the cam straps. As another example, alternate material types (e.g., plastic and/or other polymers, titanium and/or other metals/alloys, etc.), may be substituted for the 6061 aluminum plates from which the example platform and/or seat are/is formed. These and other deviations from the particular embodiments shown will be apparent to those skilled in the art, particularly in view of the foregoing disclosure.