US 4,583,908 AGrant
Mobile Device for Handling Material
Issue Date:1986-04-22
•19 Claims
•5 Drawing Sheets
Abstract
A mobile device for handling material of various types including a frame having an endless track mounted on each side thereof for providing mobility to the frame. A source of power in the form of an internal combustion engine is mounted directly on the frame. A turntable is rotatably mounted on the frame with a boom pivotally connected at its lower end to the turntable at a point spaced from the rotating axis of the turntable for pivotal movement of the boom in a vertical plane over the turntable by means of a hydraulic ram connected at its lower end to the turntable at a point intermediate the rotating axis of the turntable and the pivotal connection of the lower end of the boom with the upper end of the ram connected to the boom. The turntable is mounted on the frame for pivotal movement of the same with the boom thereon transversely to each side of the device. Material handling apparatus for trees may be mounted on the outer end of the boom and conventional controls are provided for actuation of the boom, the endless tracks, the turntable and the material handling apparatus.
Metadata
Inventor
- Patrick J. Crawford
Application Information
Application Number:US 6849857
Filing Date:1984-12-21
Priority Date:1980-02-12
Art Unit:317
Classifications
IPC:
B66D 300
Field of Search:
414144212280685;687;688;694;7182 Z;3 D;34 R;34 E;335;339238;253;2546 R;6 H
Patent Drawings (5 sheets)
Description
Summary
The invention herein disclosed relates to an improvement in a mobile device for handling material and with a tree handling apparatus on the boom thereof a standing tree may be delimbed, felled and moved to a desired location. Other material handling devices may be mounted on the end of the boom such as a bucket, a clam, or a grapple and the like for handling items of various natures such as dirt, containers, machines etc.
The device disclosed uses hydrostatic driven endless tracks mounted on a frame for propelling the same but differs from known machines in that the engine for providing power is mounted directly on the frame and not on the revolving roller bearing platform. Such construction allows for a unique boom geometry on the platform with which no counterbalance is needed and which gives the capability of handling, in one example, the cutting of a tree and then revolving 360 degrees, all within the width of the endless tracks.
Additionally and with reference to handling trees, the boom with a shear and delimbing clamp tower apparatus on the outer end thereof can be extended substantially straight up to their total length above the ground allowing for the delimbing of softwood trees from the top down. With the turntable mounted in the middle of the frame and above the engine it allows for the mounting of two spaced large hydraulic rams for pivoting of the turntable to either side of the device up to some 30 degrees and leaves one end of the frame for the mounting of an inverted grapple for use in skidding sheared trees or the mounting of a bunk for carrying wood in 8 foot lengths.
The device having apparatus for handling material such as trees is known in the trade as a "feller buncher" and this is the first known device designed from the ground up, primarily as a "feller buncher". Present day known bunchers are spin-offs of primarily dirt moving and log handling machines such as front end loaders and excavators. Advantages include the engine mounted low in the rigid main frame instead of on a rotating platform which not only lowers the center of gravity but allows the moving of the main boom and main lift cylinder pivot points well offset from the center of the turntable. With such pivot points offset greater stability is gained for the boom than hanging a large counterweight on a boom platform and the weight of the machine is reduced which gives less ground pressure and provides better maneuverability of the device.
With no counterweight and engine on a turntable platform as in known devices and the pivot points for boom and boom lift hydraulic ram offset from the center of the rotatable platform, the geometry of the booms is such that a tree can be cut, picked up and turned 360 degrees all within a nine foot overall width of the device. Known swing boom bunchers require 25 to 30 feet to be turned. Thus with applicant's device work can be done in cramped quarters and without damage to trees or other items making up the cramped quarters. With applicant's device selective tree cutting and thinning can be done much more profitably and with less damage to remaining trees.
The boom configuration also allows for a vertical reach of the extended boom to almost ninety degrees. With a delimbing top clamp on shear head apparatus mounted on the end of the boom it gives the added capability of reaching some 30 to 40 feet up a tree and delimbing the tree from the top down by simply lowering the shear.
In tree plantations where the trees are planted in rows five to six feet apart, the machine herein disclosed will row thin by delimbing, cutting and pivoting the severed trees 180 degrees all within the width of the machine and two rows of trees and placing the tree on the rear end of machine in an inverted grapple or on the ground. With the turntable tiltable to either side of the machine about thirty degrees the machine may be positioned on a slope of ground while the turntable and a cab thereon are in a level position also this feature gives extra reach in the boom down position. Additionally the turntable and boom thereon may be pivoted whereby the boom and delimber and shear thereon may be angled for positioning on a tree growing at an angle or something less then 90 degrees from the ground.
The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawings, showing by way of example a preferred embodiment of the inventive idea wherein like numerals refer to like parts throughout.
In the drawings forming part of this application:
FIG. 1 is a side elevational view of a mobile tree felling and handling device embodying the invention with the pivotal boom in a raised position and in line with the longitudinal axis of the device and in the direction of the rear of the device.
FIG. 2 is a front elevational view of the device with the cab at a right angle to the longitudinal axis of the device and the boom in a lowered compact position with the butt of a felled tree held substantially vertically in the tree shear and delimber unit.
FIG. 3 is a perspective view of the device with the cab and boom in line with the longitudinal axis of the device and the boom shown in raised position with the shear and delimber in position upon the upper portion of a tree.
FIG. 4 is a front elevational view of the device with the boom and cab angularly lowered to one side with the tree shear and delimber in engagement with the trunk of a standing tree.
FIG. 5 is a side elevational view with the boom and cab in line with the longitudinal axis of the device and the boom in a lowered compact position with the butt end of a tree in position on the shear and delimber.
FIG. 6 is an end view of the device positioned on an inclined surface with the cab and boom horizontally disposed.
FIG. 7 is a view similar to FIG. 6 but with the incline in the opposite direction.
FIG. 8 is a transverse sectional view through the mechanism for tilting the cab and boom thereon.
FIG. 9 is a sectional view on the line 9--9 of FIG. 8.
FIG. 10 is a perspective view of the boom-mounted shear and delimbing unit.
FIG. 11 is a diagrammatic top plan view of the device shown in position in a plantation of trees to be felled and moved.
FIG. 12 is a perspective view principally of the main frame and rotatable turntable thereon with the driving tracks shown in broken lines.
FIG. 13 is a view on the line 13--13 of FIG. 8.
Referring to the drawings in detail, the mobile tree felling and handling device A includes the longitudinally extending main frame 16. The frame 16 includes the spaced longitudinal side members 18 and 20 connected together by the front end member 22 and the rear end member 24 and the frame extends within and between the conventional endless driving tracks 26 and 28. The tracks 26 and 28 are mounted on the frame 16 adjacent the side members, respectively, by conventional means, and the tracks are independently driven by conventional means such as hydraulic motors and the like. The device A is referred to in the trade as a "feller buncher".
Mounted directly on the frame 16 between the frame side members 18 and 20 below and independent of the rotatable boom platform hereinafter described is the relatively low mounted power supply means in one form of an internal combustion engine E which supplies power to the tracks 26 and 28 and the mechanism for operation of the boom B hereinafter described. The mounting of the engine as described reduces the horizontal extent of the rotatable boom platform due to the fact that the engine in not mounted on the platform, and it provides a low center of gravity for the entire device A.
Further provided are a pair of spaced upright side mounts 30 and 32 for the cab C and boom B which are connected to the main frame side members 18 and 20, respectively. The side mount 30 includes the front oblique member 34 connected to the top member 36 which in turn is connected to the rear oblique member 38. The side mount 32 includes the front oblique member 40 connected to the top member 42 which in turn is connected to the rear oblique member 44. The members 34 and 38 of side mount 30 are connected at the lower ends to the frame side member 18, and the members 40 and 44 of side mount 32 are connected at the lower ends to the frame side member 20. The side mount 30 also includes the vertical frame members 39 and 41 connected to the frame member 18 and the top member 36. The side mount 32 also includes the vertical frame members 43 and 45 connected to the frame member 20.
Referring in particular to FIGS. 8 and 9 the numeral 46 designates a roller bearing turntable which is above and independent of the engine E and it includes the stationary ring gear 48 which is engaged by the driven pinion gear 50 mounted on the shaft 52 of the hydraulic motor 54. The turntable 46 also includes the circular base 56 on which the ring gear 48 is mounted and the rotatable platform 58 which mounts the motor 54 and the cab C independent of the engine E. The shaft 52 of the hydraulic motor extends through a hole 60 formed in the platform 58. It will be seen that the engine E is mounted relatively low with respect to and below the plane of the cab platform 58 and turntable 46 and also independent of the platform 58 on which the cab C is mounted. Controls for operation of the tracks, the turntable, the boom and a tree handling device on the end of the boom are conventional and are mounted in the cab C. Additionally, the rotatable platform 58 does not require a counterweight mounted thereon due to the location of the engine E and the geometry of the mounting of the boom as hereinafter described.
The turntable base 56 is mounted for pivotal movement to either side of the device on an axis parallel to the longitudinal axis of the device A by means of the spaced ears 62 connected to and centrally of the cross bar 59 with a first pin 66 positioned thru the ears 62 and a hole in the lug 67 connected to the base 56, particularly FIGS. 8, 9 and 12. A second pin 68 is positioned freely through holes formed in the spaced ears 64 connected to cross bar 61 and extending through holes formed in lugs identical to lugs 67 and connected to base 56 opposite lugs 67. With the turntable mounted centrally of the frame and above the engine E, it allows for the mounting of two rams hereinafter referred to for pivoting of the turntable platform transversely to either side of the machine.
With particular reference to FIGS. 8, 9 and 12 there is provided a first pair of spaced ears 70 connected to base 56, and pivotally connected therebetween by means of the pin 72 is the outer end of the piston 74 of the hydraulic ram 76. The ram 76 is pivoted at its lower end between a pair of spaced ears 78 by means of the pin 80, the ears 78 connected to the frame member 20. Additionally provided is a second pair of spaced ears 82, connected to base 56 180.degree. therefrom and pivotally connected therebetween by means of the pin 84 is the outer end of the piston 86 of the hydraulic ram 88. The ram 88 is pivotally connected at its lower end between a pair of spaced ears 90 by means of the pin 92, the ears 90 connected to the frame member 18.
Secured to the platform 58 are a pair of upstanding boom support spaced plates 92 and 94 which extend parallel to the platform and turntable with the outer ends of the boom support plates beyond the perimeter of the turntable, said boom support plates not extending substantially beyond the width of the tracks 26 and 28 at any position of said turntable rotated relative to the device.
The numeral 96 designates a main boom member having a lower portion 98 which is pivoted at its lower end between the plates 92 and 94 by means of the pin 100 at the outer ends of the plates for pivotal movement of the boom in a vertical plane over said boom support plates and said turntable. The pivot 100 extends from the center of the turntable 46 a distance substantially no greater than one half the distance between the overall width of the tracks 26 and 28. The upper end of the lower boom portion 98 terminates in the upper portion 102 which is angularly disposed to the lower portion 98.
Further provided is the hydraulic ram 104 pivotally connected at its lower end between the inner end portions of plates 92 and 94 by pin 106 at a point intermediate the rotating axis of the turntable and the pin 100. The upper end of the piston 108 of the ram 104 is pivotally connected to the upper end of the boom portion 98 by means of the pin 108a. Pivotally connected at its lower end to the upper end of the upper main boom portion 102 is the upper boom member 110 by means of the pin 112a.
The upper boom member 110 is pivoted by means of the hydraulic ram 113 pivotally connected at its lower end to the upper main boom portion 102 by means of the pin 114 with the piston 116 of the ram pivotally connected at its outer end to the upper boom portion 110 by means of the pin 118. The outer end of the upper boom portion 110 terminates in the offset portion 112. Pivotally connected to the outer end of the offset portion 112 is the tree processing member in one form of the shear and delimbing unit S by means of the pin 124. The unit S briefly includes particularly FIG. 10, the shear blades b and b and the tree-clamping jaws d and d spaced from the blades b and b. A tree is clamped in the unit S whereby it can be sheared off by means of the blades b and b and moved about with the unit S. Delimbing is accomplished by elevating the unit S to the top of a tree and allowing it to drop down the tree which severs the limbs. The unit designated as S is disclosed in U.S. Pat. No. 4,046,179 and is pivoted by means of hydrualic ram 126 pivotally connected at its lower end to the boom member 110 by means of pin 112 with the piston 128 pivotally connected at its outer end to the unit S by means of the pin 130. The boom is manipulated whereby the shear and delimbing unit S is placed at the top of a standing tree and moved down the tree thereby delimbing the tree by the shearing force of the concave cutting area 132 and 134 of the clamps and the curved cutting member 136 of the unit S striking the limbs. With the tree delimbed the same is sheared off at the bottom by means of the shear blades b and b, and while the tree is clamped by the unit S and the butt thereof restrained by the collar portions c-c, the tree can be placed, for example, from a point in front of the device A to a point behind the unit A by rotating the turntable and cab C thereon and boom 180.degree. between and all within the width of the tracks 26 and 28 and without contacting the rows of trees T at the sides of the device as illustrated in FIG. 11 to point Y. Alternatively the tree can be placed at any point about the device A.
Operation
One manner of operation of the device A is as follows: The device is moved by means of the tracks to a point adjacent a standing tree. The boom is elevated to a point whereby the delimbing and shear unit S is loosely clamped about the top portion of a tree. The unit S is caused to move downwardly and upon the tree thereby delimbing the tree by means of the cutting edges hereinbefore referred to. With the unit S at the bottom of a tree the clamps d-d are moved into tight clamping engagement with the tree and the blades b-b operated to shear off the tree at the base thereof.
With the tree still clamped and held by the unit S, the tree can be rotated by means of the boom and turntable from a point P in front of the device to, for example, behind the device to point Y in plantation tree rows, FIG. 11, with the boom, cab, turntable, shear unit S and tree within the extent of the device and not contacting the row trees closely adjacent the device, FIGS. 2 and 11.
It will be seen that with the pivot pin of the lower end of the boom offset from the center of the turntable and the ram pivoted at its lower end on the turntable at a point between the rotational axis of the turntable and the boom pivot pin together with the boom pivotal over the turntable, that feature together with the engine E mounted on the frame does away with the need of a counterweight on the boom platform.
Additionally, the device may be operated as angularly disposed on the side of a hill with the cab maintained in a vertical position due to the tilting ability of the turntable, FIGS. 6 and 7. Further, with the tilt feature of the turntable and the positioning geometry of the boom pivot and ram therefore the reach of the boom is extended, particularly FIG. 4.
With a tree standing at less than 90.degree. to the ground the shear unit S can be tilted through the boom by means of tilting the turntable 46 to accommodate the angle of the tree.
A further advantage of the turntable described is to tilt the turntable whereby the boom can reach well below the ground level of the tracks illustrated to some extent in FIG. 4. With the device described a tree may be cut, held in the position of FIG. 2 and rotated 360.degree. within the extent of the device with less damage to remaining trees and which allows selective cutting and thinning of standing trees to be done more profitably.
Claims
Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:
1. Device for handling material comprising, in combination: a frame having a first frame axis and a second frame axis which is perpendicular to the first frame axis; a base portion; a rotatable platform rotatably mounted relative to the base portion about a turntable pivot axis; means for rotating the platform relative to the base portion about the turntable pivot axis, with the base portion and the rotatable platform forming a turntable assembly; means for handling material operatively attached to the rotatable platform of the turntable assembly; means for pivotally mounting the base portion to the frame about a base portion pivot axis which is parallel to the second frame axis; means for pivoting the base portion about the base portion pivot axis, with the frame having a shape complementary to and for pivotal receipt of the base portion in a non-interfering manner allowing the base portion to be pivoted by the base portion pivoting means in the range of 30 degrees without the turntable assembly and the material handling means interfering with the frame, wherein the material handling means can be positioned relative to the material by pivoting the rotatable platform about the turntable pivot axis by the platform rotating means and/or by pivoting the base portion about the base portion pivot axis by the base portion pivoting means
2. The device of claim 1 wherein the material handling means includes: a first boom having an outer end and an inner end; means for pivotally mounting the inner end of the first boom to the rotatable platform of the turntable assembly about a first boom pivot axis which is generally perpendicular to and spaced from the turntable pivot axis with the first boom substantially overlying a diameter of the turntable assembly; a first hydraulic ram having its lower end pivotally connected to the rotatable platform about a first boom ram pivot axis which is perpendicular to and spaced from the turntable pivot axis, parallel to the first boom pivot axis, and intermediate the turntable pivot axis and the first boom pivot axis and having an upper end pivotally connected to the first boom; a second boom having an outer end and an inner end; means for pivotally mounting the inner end of the second boom to the outer end of the first boom about a second boom pivot axis, with the second boom pivot axis being parallel to the first boom pivot axis; and a second hydraulic ram having a lower end pivotally connected to the first boom and having an upper end pivotally connected to the second boom, with the spacing of the first boom pivot axis and the first boom ram pivot axis from the turntable pivot axis allowing greater stability without the necessity of a counterbalance.
3. The device of claim 2 wherein the extent of the material handling means and the rotatable platform of the turntable assembly in the direction of the first boom pivot axis and spacing of the first boom pivot axis from the turntable pivot axis is substantially equal to one half the overall width of the frame allowing the rotatable platform and the material handling means including the first and second booms to be pivoted 360 degrees about the turntable pivot axis within the horizontal extent of the frame when the material handling means is in a lowered condition with the first hydraulic ram in an extended condition and the second hydraulic ram in a retracted condition.
4. The device of claim 2 wherein the material handling means further comprises, in combination: means for clamping a tree including means for delimbing the tree and a shear for cutting the tree held within the clamping means.
5. The device of claim 1 wherein the frame includes first and second longitudinal side members lying along the second frame axis; wherein the device further comprises, in combination: a source of power, with the source of power being mounted between the first and second longitudinal side members; and means associated with the source of power for actuating the platform rotating means, the base portion pivoting means, and the material handling means.
6. The device of claim 1 further comprising, in combination: means operatively attached to the rotatable platform and alongside the material handling means for supporting an operator rotatable with the rotatable platform and the material handling means.
7. The device of claim 1 wherein the base portion pivoting means comprises, in combination: at least a first hydraulic ram including a hollow cylinder having a first, open end and a second, closed end and a piston reciprocally received in the first open end of the hollow cylinder, means for pivotally mounting the free end of the piston to the base portion about a piston pivot axis generally parallel to but spaced from the base portion pivot axis, and means for pivotally mounting the cylinder to the frame about a cylinder pivot axis which is perpendicular to the ram and parallel to the piston pivot axis and the base portion pivot axis.
8. The device of claim 1 wherein the frame comprises, in combination: first and second longitudinal side members lying along the second frame axis; a first top member located above and generally parallel to the first longitudinal side member; a second top member located above and generally parallel to the second longitudinal side member, with the top members having first and second ends; a first cross member extending between the first ends of the first and second top members; and a second cross member extending between the second ends of the first and second top members, with the base portion pivot axis being generally perpendicular to the first and second cross members and parallel to and intermediate the first and second top members.
9. The device of claim 8 wherein the spacing of the first and second top members from the base portion pivot axis is greater than the extent of the base portion from the base portion pivot axis, with the top members and cross members being free of members in the path of the base portion when pivoted by the base portion pivoting means allowing parts of the base portion to pass through a plane defined by the top members.
10. The device of claim 9 wherein the base portion pivoting means comprises, in combination: at least a first hydraulic ram having a first end and a second end; means for pivotally mounting the first end of the hydraulic ram to the base portion about a first, ram pivot axis generally parallel to but spaced from the base portion pivot axis; and means for pivotally mounting the second end of the hydraulic ram to the frame about a second, ram pivot axis which is perpendicular to the hydraulic ram and parallel to the first, ram pivot axis and the base portion pivot axis.
11. The device of claim 10 wherein the second, ram pivot axis is located below the plane of the top members and wherein a substantial portion of the hydraulic ram is located below the plane of the top members.
12. The device of claim 8 wherein the base portion pivoting means comprises, in combination: at least a first hydraulic ram having a first end and a second end; means for pivotally mounting the first end of the hydraulic ram to the base portion about a first, ram pivot axis generally parallel to but spaced from the base portion pivot axis; and means for pivotally mounting the second end of the hydraulic ram to the frame about a second, ram pivot axis which is perpendicular to the hydraulic ram and parallel to the first, ram pivot axis and the base portion pivot axis; and wherein the second, ram pivot axis is located below the plane of the top members and wherein a substantial portion of the hydraulic ram is located below the plane of the top members.
13. The device of claim 8 wherein the frame further includes means for securing the first top member to the first longitudinal side member and means for securing the second top member to the second longitudinal side member.
14. The device of claim 13 wherein the top member securing means comprises, in combination: vertical frame members extending between and connected to the top members and the longitudinal side members.
15. The device of claim 1 further comprising, in combination: a source of power mounted on the frame, with the source of power having an uppermost portion and a width, with the width of the source of power being less than the width of the frame, with the source of power mounted on the frame so that a plane extending through and defined by the rotatable platform of the turntable assembly does not in all positions of the turntable assembly extend through a plane extending through the uppermost portion of the source of power and parallel to the first and second frame axes and having a width equal to the width of the source of power.
16. The device of claim 1 further comprising, in combination: a source of power mounted on the frame; ground engaging means mounted on the frame for providing mobility to the frame; and means associated with the source of power for actuating the ground engaging means, the platform rotating means, the base portion pivoting means, and the material handling means.
17. Device for handling material comprising, in combination: a frame; a base portion; means for mounting the base portion to the frame; a rotatable platform rotatably mounted relative to the base portion about a turntable pivot axis; means for rotating the platform relative to the base portion about the turntable pivot axis, with the base portion and the rotatable platform forming a turntable assembly; means operatively attached to the device for supporting an operator; and means for handling material operatively attached to the platform of the turntable assembly comprising, in combination: a first boom having an outer end and an inner end; means for pivotally mounting the inner end of the first boom to the rotatable platform of the turntable assembly about a first boom pivot axis which is generally perpendicular to and spaced from the turntable pivot axis with the first boom substantially overlying a diameter of the turntable assembly; a second boom having an outer end and an inner end; means for pivotally mounting the inner end of the second boom to the outer end of the first boom about a second boom pivot axis, with the second boom pivot axis being parallel to the first boom pivot axis; a first hydraulic ram having its lower end pivotally connected to the rotatable platform about a first boom ram pivot axis which is perpendicular to and spaced from the turntable pivot axis, parallel to the first boom pivot axis, and intermediate the turntable pivot axis and the first boom pivot axis and having an upper end pivotally connected to the first boom; a second hydraulic ram having a lower end pivotally connected to the first boom and having an upper end pivotally connected to the second boom, with the spacing of the first boom pivot axis and the first boom ram pivot axis from the turntable pivot axis allowing greater stability without the necessity of a counterbalance.
18. The device of claim 17 wherein the extent of the material handling means and the rotatable platform of the turntable assembly in the direction of the first boom pivot axis and the spacing of the first boom pivot axis from the turntable pivot axis is substantially equal to one half the overall width of the frame allowing the rotatable platform and the material handling means including the first and second booms to be pivoted 360 degrees about the turntable pivot axis within the horizontal extent of the frame when the material handling means is in a lowered condition with the first hydraulic ram in an extended condition and the second hydraulic ram in a retracted condition.
19. Device for handling material comprising, in combination: a frame; a base portion; means for mounting the base portion to the frame; a rotatable platform rotatably mounted relative to the base portion about a turntable pivot axis; means for rotating the platform relative to the base portion about the turntable pivot axis, with the base portion and the rotatable platform forming a turntable assembly; means operatively attached to the device for supporting an operator; and means for handling material operatively attached to the rotatable platform of the turntable assembly comprising, in combination: a first boom having an outer end and an inner end; means for pivotally mounting the inner end of the first boom to the rotatable platform of the turntable assembly about a first boom pivot axis which is generally perpendicular to and spaced from the turntable pivot axis with the first boom substantially overlying a diameter of the turntable assembly; a second boom having an outer end and an inner end; means for pivotally mounting the inner end of the second boom to the outer end of the first boom about a second boom pivot axis, with the second boom pivot axis being parallel to the first boom pivot axis; a first hydraulic ram having its lower end pivotally connected to the rotatable platform about a first boom ram pivot axis which is perpendicular to and spaced from the turntable pivot axis, parallel to the first boom pivot axis, and intermediate the turntable pivot axis and the first boom pivot axis and having an upper end pivotally connected to the first boom; a second hydraulic ram having a lower end pivotally connected to the first boom and having an upper end pivotally connected to the second boom, with the extent of the material handling means and the rotatable platform of the turntable assembly in the direction of the first boom pivot axis being substantially equal to one half the overall width of the frame, with the horizontal extent of the material handling means from the turntable pivot axis in the direction away from the first boom pivot axis in a lowered condition with the first hydraulic ram in an extended condition and the second hydraulic ram in a retracted condition being substantially equal to one half the overall width of the frame allowing the rotatable platform and the material handling means including the first and second booms to be pivoted 380 degrees about the turntable pivot axis within the horizontal extent of the frame.
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