CUTTING TOOL

[0001] This application is a continuation-in-part (CIP) application claiming benefit of U.S. patent application Ser. No. 18/150,583 filed on Jan. 5, 2023, which is a CIP application claiming benefit of PCT/CN2020/100849 filed on Jul. 8, 2020. The disclosures of those applications are incorporated herein in their entirety by reference.

[0002] The present invention relates to the field of board cutting and, in particular, to a cutting tool.

[0003] In our daily lives, cutting tools refer to a collection of tools using blades. Thin solid materials often need to be cut and trimmed to meet the requirements of various uses. In particular, in the fields of construction and decoration, it is a very common need to cut and trim thin wooden or plastic polymer materials such as flooring boards and wall tiles into suitable shapes and sizes so that they can be placed at edge, corner or other locations of buildings in need of the shapes. Differing from thin materials like paper and cloth, thin wooden or plastic polymer materials used for construction and decoration, such as flooring boards and wall tiles, are relatively strong, making their cutting and trimming require the application of strong pressure.

[0004] In the prior art, in order to achieve the purpose of cutting a wood board or a polymer material board, the tool used must provide a sufficiently large cutting force. To meet this requirement, cutting tools used in the prior art are associated with the problems of large sizes and heavy weights. In order to provide sufficient power, some cutting tools utilize electric, pneumatic and other external power, but this itself would increase structural complexity and cost of these cutting tools, making their application scenarios limited by site conditions. The cutting tools in the prior art are also associated with the problems of tending to cause cracking and damage to material edges.

[0005] Therefore, those skilled in the art are directing their effort toward developing a cutting tool, which can provide a cutting force sufficient to cut a wood board or a plastic polymer board simply by manpower without needing to resort to any external power and is thus simple in structure, easy to carry and low in cost. Additionally, this cutting tool can cut a material in a predictable and linear manner without causing cracking of the material during cutting.

[0006] In view of the above described shortcomings of the prior art, the problem sought to be solved by the present invention lies in how to, through structural design, provide a sufficiently large cutting force simply by manpower and to ensure that cracking will not occur to a material that is being cut.

[0007] In order to solve the above problem, the present invention provides a cutting tool comprising a bearing member, a first cutting member and a second cutting member, characterized in the first cutting member being fixedly coupled to the bearing member, the bearing member being provided thereon with a first axle, the second cutting member being pivotably coupled to the bearing member by the first axle.

[0008] Additionally, a manipulation member is further included, which is coupled to the second cutting member. The manipulation member is configured to drive the second cutting member to pivot about the first axle.

[0009] Additionally, the bearing member is provided thereon with a second axle, and the manipulation member is pivotably coupled to the bearing member by the second axle.

[0010] Additionally, an avoidance part is further included, which is configured to avoid the manipulation member from contact with a material to be cut during cutting.

[0011] Additionally, the avoidance part is a raised blade edge provided on the second cutting member.

[0012] Additionally, the raised blade edge is provided on an end of the second cutting member away from the first axle.

[0013] Additionally, the avoidance part is a notch provided in the manipulation member.

[0014] Additionally, the manipulation member is provided with an opening, and the second cutting member is fixedly provided thereon with a connecting pin. The connecting pin is inserted in the opening to couple the manipulation member to the second cutting member.

[0015] Additionally, the manipulation member is elongate in shape, and the opening is also elongate in shape. The elongate opening is arranged along a lengthwise direction of the manipulation member.

[0016] Additionally, the opening is provided at the middle of the manipulation member, and the connecting pin is provided at the middle of the second cutting member.

[0017] Additionally, the bearing member is provided thereon with a first connecting seat, in which the first axle is provided.

[0018] Additionally, the bearing member is provided thereon with a second connecting seat, in which the second axle is provided.

[0019] Additionally, the second cutting member is elongate in shape.

[0020] Additionally, a blade edge of the second cutting member is curved.

[0021] Additionally, the blade edge of the second cutting member defines a curved line concave toward a blade back of the second cutting member.

[0022] Additionally, the second cutting member has a width greater at an end thereof close to the first axle than at an end thereof away from the first axle.

[0023] Additionally, a grip member is further included, which is a trapezoidal opening provided in the bearing member.

[0024] Additionally, the manipulation member is provided thereon with a handle. The handle is disposed on an end of the manipulation member away from the second axle.

[0025] Additionally, the manipulation member is provided thereon with a locking fastener, and a securing member projects from a side face of the second cutting member. The locking fastener is configured to be able to lock the securing member to secure the manipulation member relative to the second cutting member.

[0026] Additionally, the bearing member is provided thereon with a measuring member.

[0027] The present invention further provides a cutting tool, comprising:

• • [0028] a bearing member, the bearing member being provided thereon with a first axle and a second axle;
  • [0029] a first cutting member, the first cutting member being fixedly coupled to the bearing member;
  • [0030] a second cutting member, the second cutting member being pivotably coupled to the bearing member by the first axle; the second cutting member being configured to be able to pivot to come into engagement with the first cutting member to produce a shearing force on a material to be cut that is placed on the bearing member;
  • [0031] a manipulation member, the manipulation member being pivotably coupled to the bearing member by the second axle, the manipulation member being coupled to the second cutting member, the manipulation member being configured to drive the second cutting member to pivot about the first axle;
  • [0032] a handle, the handle being configured to be insertable into and positionable at an end of the manipulation member away from the second axle; and
  • [0033] an avoidance part, the avoidance part being configured to avoid the manipulation member from contact with the material to be cut during cutting.

[0034] Additionally, the avoidance part comprises a raised blade edge provided on the second cutting member, and the raised blade edge is provided on the second cutting member at an end away from the first axle.

[0035] Additionally, the avoidance part comprises a notch provided on the manipulation member.

[0036] Additionally, the manipulation member is provided with an opening that is elongate in shape, the second cutting member is fixedly provided thereon with a connecting pin, and the connecting pin is inserted in the opening to accomplish coupling of the manipulation member and the second cutting member.

[0037] Additionally, the opening is provided at a middle of the manipulation member, and the connecting pin is provided at a middle of the second cutting member.

[0038] Additionally, the bearing member is provided thereon with a first connecting seat and a second connecting seat, the first axle is provided in the first connecting seat, and the second axle is provided in the second connecting seat.

[0039] Additionally, a blade edge of the second cutting member is straight or curved.

[0040] Additionally, the blade edge of the second cutting member defines a curved line concave toward a blade back of the second cutting member.

[0041] Additionally, a width of the second cutting member at an end thereof close to the first axle is greater than a width thereof at an end away from the first axle.

[0042] Additionally, the manipulation member is provided thereon with a locking fastener, the second cutting member comprises a securing member projecting from a side face of the second cutting member, and the locking fastener is configured to be able to lock the securing member to secure the manipulation member relative to the second cutting member.

[0043] Additionally, the bearing member is provided thereon with a measuring member.

[0044] Additionally, an end of the first cutting member is fixedly coupled to the first axle.

[0045] Additionally, an end of the first cutting member is fixedly coupled to the second axle.

[0046] Additionally, the manipulation member is provided thereon with a connecting block, the connecting block is coupled to the end of the manipulation member away from the second axle, the connecting block is provided thereon with a connecting groove, the handle is provided thereon with a connecting protrusion mating with the connecting groove, and the connecting protrusion is configured to be insertable into the connecting groove.

[0047] Additionally, it further comprises a limiting member, the limiting member is movably arranged between the handle and the connecting block, and the limiting member is configured to be able to restrict relative movement of the handle and the manipulation member along a disengagement direction.

[0048] Additionally, the limiting member comprises a pin, a bottom of the connecting groove is provided with a mating hole, and the pin is configured to be insertable through the handle into the mating hole.

[0049] Additionally, the limiting member comprises a movable lug and an actuator, a bottom of the connecting groove is provided with a catch slot, the movable lug is movably arranged in a chamber in the connecting protrusion, and the movable lug is configured to be drivable by the actuator to enter the catch slot, such that at least a portion of the movable lug is blocked by the catch slot, thereby restricting relative movement of the connecting protrusion and the connecting groove.

[0050] Additionally, the actuator comprises a first elastic member, the first elastic member is arranged between a top of the chamber and the movable lug, and the first elastic member is configured to be able to utilize an elastic force to push the movable lug into the catch slot.

[0051] Additionally, the actuator comprises an adjustment member, an end of the adjustment member is coupled to the movable lug, another end of the adjustment member is arranged to pass through the handle, and the adjustment member is configured to be adjustable to drive the movable lug to translate into the catch slot.

[0052] Additionally, the actuator comprises an adjustment member, an end of the adjustment member is coupled to the movable lug, another end of the adjustment member is arranged to pass through the handle, and the adjustment member is configured to be adjustable to drive the movable lug to rotate into the catch slot.

[0053] Compared with the prior art, the present invention has at least the following benefits:

• • [0054] 1. The product is simple in structure and does not need an external pneumatic or electric source. Therefore, it can be used in a wide range of application scenarios and is not limited by site resources. Moreover, as the product is simple in structure, it is lightweight and easy to carry.
  • [0055] 2. It is unnecessary to design a supporting power structure for an external power source. Therefore, the cost is low.
  • [0056] 3. The present application provides an avoidance part, which can prevent breakage of a material, reduce loss of the material and improve operating efficiency.
  • [0057] 4. The present application provides a new way for the handle to engage with and disengage from the manipulation member, which is convenient for user operation and allows more accurate positioning of the handle.

[0058] Below, the concept, structural details and resulting technical effects of the present invention will be further described with reference to the accompanying drawings to provide a full understanding of the objects, features and effects of the invention.

• • [0076] in which, 11 denotes a bearing member; 111, a first pivot axis point; 1111, a first holder; 1112, a first axle hole; 1113, a first bolt; 112, a second pivot axis point; 1121, a second holder; 1122, a second axle hole; 1123, a second bolt; 113, a ruler; 114, a grip opening; 12, a first cutting member; 121, a horizontal portion; 122, a bent portion; 13, a second cutting member; 131, a pin; 14, a manipulation member; 141, a slot; 142, a connecting pin; 143, an elongate notch; 144, a handle; 145, a locking fastener; 146, a connecting protrusion; 147, a chamber; 148, a catch slot; 23, a second cutting member; 311, a first pivot axis point; 312, a second pivot axis point; 32, a first cutting member; 33, a second cutting member; 330, a raised blade edge; 34, a manipulation member; 51, a bearing member; 52, a first cutting member; 53, a second cutting member; 54, a manipulation member; 541, a slot; 15, a connecting block; 151, a connecting groove; 152, a movable lug; 153, a first elastic member; 154, a limiting pin; 155, a guide hole; 156, an adjustment member; 157, a stop block; 158, a pin; 159, a mating hole; 160, a third axle; and 161, a second elastic member.

[0077] Below, the drawings accompanying this specification are referenced to introduce many preferred embodiments of the present invention so that the techniques disclosed herein become more apparent and better understood. The present invention may be embodied in many different forms of embodiment, and its protection scope is not limited only to the embodiments mentioned herein.

[0078] Throughout the accompanying drawings, structurally identical parts are indicated with identical reference numerals, and structurally or functionally similar components are indicated with similar reference numerals. The size and thickness of each element in the drawings are arbitrarily depicted, and the present invention is not limited to any size or thickness of each element. For greater clarity of illustration, the thicknesses of some parts are exaggerated as appropriate somewhere in the drawings.

[0079] FIGS. 1 to 3 show one embodiment of the present invention. It includes a bearing member 11, which is a base of the present invention for placement thereon of various components and for bearing a material to be cut. This embodiment produces, by engagement of a first cutting member 12 with a second cutting member 13, a shearing force for cutting a board. Wherein, the first cutting member 12 is elongate in shape and fixedly disposed on a side face of the bearing member 11, and the second cutting member 13 is movable relative to the bearing member. During movement of the second cutting member 13, a blade edge of the second cutting member 13 comes into engagement with a blade edge of the first cutting member 12, thereby producing a shearing force. In addition, in order to be able to provide a larger shearing force, this embodiment further includes a manipulation member 14 for driving the second cutting member 13 to move by using the law of the lever that can save effort. Specifically, on one side of the bearing member 11, a first pivot axis point 111 and a second pivot axis point 112 are provided at opposing ends thereof. The second cutting member 13 is coupled to the bearing member 11 by a connecting means disposed at the first pivot axis point 111. The manipulation member 14 is coupled to the bearing member 11 by a connecting means disposed at the second pivot axis point 112.

[0080] The first pivot axis point 111 is provided thereat with a first holder 1111. In this embodiment, the first holder 1111 is a U-shaped holder. Axle holes are provided in both arms of the first holder 1111. The second cutting member is elongate in shape and provided at one end thereof with a first axle hole 1112. This end with the first axle hole 1112 is assembled at the first pivot axis point 111. The axle holes in the two arms of the first holder 1111 are arranged in coincidence with the first axle hole 1112 provided in the second cutting member 13. A first bolt 1113 passes through the axle holes in the two arms of the first holder 1111 and the first axle hole 1112, thereby coupling the second cutting member 13 to the bearing means 11. Coupled by the first bolt 1113, the second cutting member 13 is able to pivot about a first axle provided by the first bolt 1113.

[0081] The second pivot axis point 112 is provided thereat with a second holder 1121. In this embodiment, the second holder 1121 is a U-shaped holder. Axle holes are provided in both arms of the second holder 1121. The manipulation member 14 is elongate in shape and provided at one end thereof with a second axle hole 1122. This end with the second axle hole 1122 is assembled at the second pivot axis point 112. The axle holes in the two arms of the second holder 1121 are arranged in coincidence with the second axle hole 1122 provided in the manipulation member 14. A second bolt 1123 passes through the axle holes in the two arms of the second holder 1121 and the second axle hole 1122, thereby coupling the manipulation member 14 to the bearing means 11. Coupled by the second bolt 1123, the manipulation member 14 is able to pivot about a second axle provided by the second bolt 1123.

[0082] It is to be noted that, in other embodiments, the first holder 1111 and the second holder 1112 may not be necessarily U-shaped holders, and only one axle hole may be provided for coupling of the second cutting member 13 to the bearing member 11, or for coupling of the manipulation member 14 to the bearing member 11.

[0083] The manipulation member 14 is provided therein with a slot 141, which is elongate in shape and arranged along a lengthwise direction of the manipulation member 14. The second cutting member 13 is provided with a connecting pin. The connecting pin passes through the slot 141 and is able to move within a space defined by the slot in the lengthwise direction of the manipulation member 14, thus coupling the second cutting member 13 to the manipulation member 14. In order to facilitate the movement of the connecting pin within the slot 141, rotating wheels 142 may be provided over the connecting pin. The rotating wheels 142 are sized to match a size of the slot 141 so that the connecting pin can more smoothly move in the slot 141. When the manipulation member 14 is pivoting about the second axle at the second pivot axis point 112, by means of the coupling of the slot 141 and the connecting pin, the second cutting member 13 is driven to pivot about the first axle at the first pivot axis point 111. The manipulation member 14 is provided at its end away from the second pivot axis point 112 with a handle 144. In use of this embodiment for cutting, a user applies an upward external force to the handle 144 (as used herein, the terms “upward” and “downward” refer to directions opposite to and in that of the natural gravity when the bearing member 11 is placed horizontally) to cause the manipulation member 14 to pivot about the second axle at the second pivot axis point 112. Driven by the manipulation member 14, the second cutting member 13 pivots about the first axle at the first pivot axis point 111 to separate from the first cutting member 12. After a material to be cut is properly placed on the bearing member 11, a downward external force is applied to the manipulation member 14 to cause the manipulation member 14 and the second cutting member 13 to pivot in directions opposite to those in the previous step so that the blade edge of the second cutting member 13 gradually comes into engagement with the first cutting member 12 to start a cutting action. Finally, the blade edge of the second cutting member 13 fully engages with the first cutting member 12, thereby completing the cutting action.

[0084] Since the second cutting member 13 produces a shearing force at the location where the blade edge of the second cutting member 13 contacts the material to be cut while the manipulation member 14 acts on the second cutting member 13 at the rotating wheels 142, as long as the rotating wheels 142 are disposed away from the first pivot axis point 111, an effort-saving lever can be provided. The farther away from the first pivot axis point 111 the rotating wheels 142 are disposed, the more effort the effort-saving lever can save. The user acts on the handle 144, while the second cutting member 13 acts on the manipulation member 14 at the slot 141. Since the handle 144 is provided at the end of the manipulation member 14 away from the second pivot axis point 112 while the slot 141 is obviously less distant from the second pivot axis point 112 than the handle 144 (see FIGS. 1 to 3), another effort-saving lever is provided, and the closer the slot 141 is to the second pivot axis point 112, the more effort the effort-saving lever can save. The two effort-saving levers are combined to enable the present device to exert a sufficiently large shearing force on a material to be cut under manual manipulation without needing an external electric, pneumatic or other power source.

[0085] When the present device is out of use, the first cutting member 12, the second cutting member 13 and the manipulation member 14 are collocated (as shown in FIG. 1). In this embodiment, the manipulation member 14 is further provided thereon with a locking fastener 145, and the second cutting member 13 is provided with a pin 131 at a corresponding position. When the first cutting member 12, the second cutting member 13 and the manipulation member 14 are collocated, the locking fastener 145 can lock the pin 131 to secure the first cutting member 12, the second cutting member 13 and the manipulation member 14 against one another to facilitate handling, improve safety and avoid accidents.

[0086] In this embodiment, the bearing member 11 is further provided thereon with a ruler 113 having a graduated surface, which serves as a measuring member in this embodiment. The ruler 113 is fixed to and raised over a top surface of the bearing member 11. The ruler 113 is provided on the side of the bearing member 11 proximal to the first pivot axis point 11 so as to be perpendicular to the first cutting member 12. In order to facilitate the handling of this embodiment, this embodiment further includes a grip member. The grip member is disposed on the bearing means 11 on the side opposite to the first cutting member 11. Specifically, the bearing means 11 is further provided with a grip opening 114 extending through the bearing means. The grip opening 114 is substantially trapezoidal, located on the side of the bearing member 11 opposite to the first cutting member 12, and parallel to the first cutting member 12. The user can conveniently hold the present device by virtue of the grip opening 114.

[0087] FIG. 4 schematically illustrates operation of this embodiment. In this embodiment, the manipulation member 14 is further provided with an elongate notch 143 in the vicinity of the second pivot axis point 112, which serves as an avoidance part of this embodiment. Thanks to the presence of the elongate notch 143, during the performance of a cutting action by the second cutting member 13 of this embodiment in order from a to b to c as shown in FIG. 4, a portion of its blade edge away from the first pivot axis point 111 will come into contact with a material to be cut earlier than a portion of the manipulation member 14 near the second pivot axis point 112. In this way, the manipulation member 14 can be avoided from causing damage to the material to be cut. In other embodiments, the avoidance part may assume different forms while still achieving similar results.

[0088] As shown in FIG. 5, this embodiment differs from Embodiment 1 in that a second cutting member 23 in Embodiment 2 has a blade edge that is curved. Specifically, the blade edge defines a curved line concave toward a blade back of the second cutting member 23. In this embodiment, the blade edge is preferably curved so that the second cutting member 23 has a large width at a location closer to the first pivot axis point 111 and a smaller width at a location farther away from the first pivot axis point 111. Using the curved blade edge can provide an effect of additionally saving effort and thereby enabling the creation of a greater shearing force by limited manpower.

[0089] FIG. 5 schematically illustrates a cutting performance comparison between the second cutting member 23 of Embodiment 2 having the curved blade edge and the second cutting member 13 of Embodiment 1 having a conventional straight blade edge. As can be seen from the figure, the second cutting member 23 of Embodiment 2 has a contact length of L1 with the material to be cut, and the second cutting member 13 of Embodiment 1 has a contact length of L2 with the material to be cut. Due to the curved blade edge, L1 is smaller than L2, leading to a lower pressure exerted by the material to be cut on the blade edge of Embodiment 2, as compared with Embodiment 1. This means that, for the same material to be cut, a cutting force F1 required in Embodiment 2 is smaller than a cutting force F2 required in Embodiment 1. Therefore, through providing the curved blade edge, some materials to be cut that would not have been cuttable simply by manpower because relatively great shearing forces are required can now be cut simply by manpower.

[0090] Indeed, the blade edge of the second cutting member 23 can also be configured with another curved shape concave toward the blade back than that of this embodiment, because similar results can be achieved as long as a shorter contact length is attainable between the blade edge and the material to be cut.

[0091] FIGS. 6 to 7 show another embodiment of the present invention. Similar to Embodiment 1, a first cutting member 32 is provided at a side face of a bearing member 31, and a first pivot axis point 311 and a second pivot axis point 312 are provided at a top surface of the bearing member 31. A second cutting member 33 is coupled to the bearing member 31 through a first axle provided at the first pivot axis point 311 so as to be able to pivot about the first axle. A manipulation member 34 is coupled to the bearing member 31 through a second axle provided at the second pivot axis point 312 so as to be able to pivot about the second axle. The manipulation member 34 is coupled to the second cutting member 33 so as to be able to drive the second cutting member to move.

[0092] Differing from Embodiment 1, in this embodiment, instead of an elongate notch in the manipulation member 34, a raised blade edge 330 is provided in the second cutting member 33 as an avoidance part of this embodiment. Thanks to the presence of the raised blade edge 330, even when there is no notch in the manipulation member 34, it can still be ensured that the second cutting member 33 comes into contact with a material to be cut earlier than the manipulation member 34 at any position, thereby protecting the material to be cut against any damage that may be caused by the manipulation member 34.

[0093] FIG. 8 shows a further embodiment of the present invention. Similar to Embodiment 1, a first cutting member 52 is provided at a side face of a bearing member 51, and a manipulation member 54 is coupled to a second cutting member 53 so as to be able to drive the second cutting member to move. Differing from the above embodiments, in this embodiment, a slot 541 that is elongate in shape is provided at the middle of the manipulation member 54. Through providing this slot 541 at said location, the same effect as with an avoidance part can be provided to similarly protect a material to be cut against any damage that may be caused by the manipulation member 54.

[0094] Further, in other embodiments, in order to additionally save effort, the second cutting member 53 may also have a curved blade edge as in Embodiment 2.

[0095] The above four embodiments describe a cutting tool. For example, in Embodiment 1, as shown in FIGS. 1 to 4, a handle 144 is provided at the end of the manipulation member 14 away from the second pivot axis point 112 for user convenience during cutting work. However, due to the presence of the handle, during storage and transportation of the cutting tool, especially when placing the cutting tool inside packaging, the cutting tool may occupy excessive space, which is not conducive to the purpose of storage. Therefore, during storage of the cutting tool, it is often necessary to first detach the handle, which can reduce volume occupancy and save storage space.

[0096] As shown in FIG. 3, the handle 144 is fixed to a side face of the manipulation member 14 with two bolts. When a user purchases a new cutting tool, it is needed to use a screwdriver to tighten the bolts to install the handle on the manipulation member. If a suitable screwdriver is not available, the handle cannot be installed, rendering the cutting tool unusable.

[0097] Additionally, as shown in FIGS. 1 to 2, the first cutting member 12 is provided on a side face of the bearing member 11. Specifically, the first cutting member 12 is fastened to a side of the bearing member 11 with a row of screws. In existing cutting processes for materials like flooring, this fastening method may not provide optimal stability, affecting the overall service life of the first cutting member 12.

[0098] To address the above problems, as shown in FIGS. 9 to 13, this embodiment provides a cutting tool. Similar to Embodiment 1, the first cutting member 12 is fastened to a side of the bearing member 11 with a row of screws. A first pivot axis point 111 and a second pivot axis point 112 are provided on the bearing member 11. The second cutting member 13 is coupled to the bearing member 11 through a first axle provided at the first pivot axis point 111, and pivots about the first axle. The manipulation member 14 is coupled to the bearing member 11 through a second axle provided at the second pivot axis point 112, and pivots about the second axle. The manipulation member 14 is coupled to the second cutting member 13 and drives the second cutting member to move.

[0099] This embodiment differs from Embodiment 1 in that the handle 144 in this embodiment is configured to be insertable into and positionable at an end of the manipulation member 14 away from the second axle.

[0100] Specifically, the manipulation member 14 is provided thereon with a connecting block 15. The connecting block 15 is coupled to the end of the manipulation member 14 away from the second axle. The connecting block 15 is provided thereon with a connecting groove 151. The connecting block 15 is detachably coupled to the manipulation member 14, for example, by being fixed to the side face of the manipulation member 14 with two bolts.

[0101] In other embodiments, the connecting block 15 may also be formed integrally with the manipulation member 14.

[0102] The handle 144 is provided thereon with a connecting protrusion 146 mating with the connecting groove 151. The connecting protrusion 146 may be part of the handle 144. When the connecting protrusion 146 is inserted into the connecting groove 151, a mating face of the connecting protrusion 146 fits against a bottom of the connecting groove 151.

[0103] In this embodiment, the connecting protrusion 146 is a T-shaped protrusion, and the connecting groove 151 is a T-shaped groove.

[0104] In other embodiments, the connecting protrusion may also be a dovetail, tenon, or curved protrusion, and the connecting groove may also be a dovetail groove, mortise, or curved groove.

[0105] When it is necessary to engage the handle 144 with the manipulation member 14, the connecting protrusion 146 on the handle 144 may be aligned with the connecting groove 151 on the connecting block 15, and the connecting protrusion 146 is inserted into the connecting groove 151 along an engagement direction E (indicated by the arrow in FIG. 11).

[0106] To achieve precise positioning of the handle 144 and the manipulation member 14, a limiting member is further provided between the handle 144 and the connecting block 15. The limiting member is able to restrict relative movement of the handle 144 and the manipulation member 14 along a disengagement direction D (indicated by the arrow in FIG. 11).

[0107] As shown in FIG. 12, in this embodiment, the limiting member comprises a movable lug 152 and a first elastic member 153. A chamber 147 capable of accommodating the movable lug 152 is provided in the connecting protrusion 146 of the handle 144. A bottom of the connecting groove 151 is provided with a catch slot 148. The chamber 147 has a chamber opening facing the bottom of the connecting groove 151 and a chamber top opposite the chamber opening. The movable lug 152 is arranged in the chamber 147. The movable lug 152 is a sheet with a substantially rectangular cross-section. The size of the movable lug 152 is slightly smaller than the size of the chamber 147, such that the movable lug 152 can move in the chamber 147.

[0108] In this embodiment, the first elastic member 153 may be a coil spring. The first elastic member 153 serves as an actuator.

[0109] The first elastic member 153 is arranged between the chamber top and the movable lug 152.

[0110] To prevent the movable lug 152 from being disengaged from the chamber 147, an elongate guide hole 155 may be provided on the movable lug 152. Two ends of a limiting pin 154 are fixed to an inner wall of the chamber 147. A middle portion of the limiting pin 154 passes through the guide hole 155 on the movable lug 152, such that the movable lug 152 is movable only within a certain range.

[0111] When the handle 144 is not engaged with the manipulation member 14, the first elastic member 153 pushes the movable lug 152 to move towards the chamber opening. The movable lug 152 extends out of the chamber opening at most until an end of the guide hole 155 close to the chamber top is blocked by the limiting pin 154.

[0112] In this embodiment, the cross-section of the movable lug 152 is chamfered rectangular, which facilitates the insertion of the connecting protrusion 146 into the connecting groove 151. When aligning the connecting protrusion 146 on the handle 144 with the connecting groove 151 on the connecting block 15 and inserting the connecting protrusion 146 into the connecting groove 151 along the engagement direction E, a sloped portion of the movable lug 152 first contacts the bottom of the connecting groove 151, causing the movable lug 152 to be retractable into the chamber 147 against the elastic force of the first elastic member 153, at which the end of the guide hole 155 close to the chamber opening has not yet been blocked by the limiting pin 154, thus not hindering the continued insertion of the connecting protrusion 146 into the connecting groove 151 along the engagement direction E.

[0113] When the connecting protrusion 146 on the handle 144 is fully inserted into the connecting groove 151, the chamber opening aligns with the catch slot 148. The first elastic member 153 can utilize its elastic force to push the movable lug 152 into the catch slot 148, and the end of the guide hole 155 close to the chamber top has not yet been blocked by the limiting pin 154, thereby positioning the handle 144 at a predetermined location. In this embodiment, when at least a portion of the movable lug 152 enters the catch slot 148, the limiting member is in a locked position. At this point, the handle 144 cannot move along the engagement direction E or the disengagement direction D.

[0114] Further, a stop block 157 may be provided at the end of the connecting groove 151 close to the second axle. The stop block 157 can block the handle 144 from continuing to move along the engagement direction E when the handle 144 is fully inserted.

[0115] This embodiment, by providing the chamber in the handle, the movable lug can be movably arranged in the chamber, the movable lug can limitedly move through the limiting pin, and elastic member is provided on a side of the movable lug to provide a preload force for the movable lug to move towards the position of the catch slot.

[0116] This embodiment enables tool-free installation of the handle, thus facilitating the use of the cutting tool.

[0117] This embodiment further differs from Embodiment 1 in that, as shown in FIGS. 9, 11, and 13, a second end (a right end in FIG. 11) of the first cutting member 12 can extend to the second axle. The second axle passes through the second end of the first cutting member 12, fixedly coupling the first cutting member 12 to the second axle.

[0118] In other words, the first cutting member 12 comprises a horizontal portion 121 and a bent portion 122 formed integrally. The horizontal portion 121 is fixedly coupled to a side face of the bearing member 11. An end of the bent portion 122 is coupled to an end of the horizontal portion 121. Another end of the bent portion 122 is provided with a slot. The second axle passes through the slot and is fixed to the first cutting member 12.

[0119] In this embodiment, an included angle α between the horizontal portion 121 and the bent portion 122 may be 100° to 160°.

[0120] In other embodiments, a first end (a left end in FIG. 11) of the first cutting member 12 can also extend to the first axle. The first axle passes through the first end of the first cutting member 12, fixedly coupling the first cutting member 12 to the first axle.

[0121] In other words, the first cutting member 12 comprises a horizontal portion and a bent portion formed integrally. The horizontal portion is fixedly coupled to a side face of the bearing member 11. An end of the bent portion is coupled to an end of the horizontal portion. Another end of the bent portion is provided with a slot. The first axle passes through this slot and is fixed to the first cutting member 12.

[0122] This embodiment, by fixedly coupling at least one end of the first cutting member to the first axle or the second axle, enhances the overall fixation strength of the cutting tool and increases the product's service life.

[0123] FIG. 14 shows another embodiment of the present invention. Except for the limiting member, the structure of this embodiment is similar to that of Embodiment 5 and will not be reiterated here.

[0124] As shown in FIG. 14, in this embodiment, the limiting member comprises a movable lug 152 and an adjustment member 156. A chamber 147 capable of accommodating the movable lug 152 is provided in the connecting protrusion 146 of the handle 144. A bottom of the connecting groove 151 is provided with a catch slot 148. The chamber 147 has a chamber opening facing the bottom of the connecting groove 151 and a chamber top opposite the chamber opening. The movable lug 152 is arranged in the chamber 147. The movable lug 152 is a sheet with a substantially rectangular cross-section. The size of the movable lug 152 is slightly smaller than the size of the chamber 147, so that the movable lug 152 can move in the chamber 147.

[0125] In this embodiment, the adjustment member 156 may be an adjustment screw. The adjustment member 156 serves as an actuator.

[0126] An adjustment member channel capable of accommodating the adjustment member 156 is provided in the handle 144. An end of the adjustment member channel is exposed out of a surface of the handle 144 away from the connecting protrusion 146, forming an adjustment member channel opening. Another end of the adjustment member channel communicates with the chamber 147. The adjustment member 156 is arranged in the adjustment member channel. An end of the adjustment member 156 is coupled to the movable lug 152. Another end of the adjustment member 156 passes through the handle 144 and is exposed out of the adjustment member channel opening.

[0127] The user can adjust the adjustment member 156 (e.g., by tightening or loosening the adjustment screw) to drive the movable lug 152 to translate from the chamber opening into the catch slot 148 or to retract into the chamber 147.

[0128] To prevent the movable lug 152 from being disengaged from the chamber 147, an elongate guide hole 155 may be provided on the movable lug 152. Two ends of a limiting pin 154 are fixed to an inner wall of the chamber 147. A middle portion of the limiting pin 154 passes through the guide hole 155 on the movable lug 152, so that the movable lug 152 can move only within a certain range.

[0129] When it is necessary to engage the handle 144 with the manipulation member 14, the user first adjusts the adjustment member 156 (e.g., by loosening the adjustment screw) to drive the movable lug 152 to move towards the chamber top, causing the movable lug 152 to be retractable into the chamber 147, at which the end of the guide hole 155 close to the chamber opening has not yet been blocked by the limiting pin 154, thus not hindering the continued insertion of the connecting protrusion 146 into the connecting groove 151 along the engagement direction E. In this embodiment, when the movable lug 152 is fully retracted into the chamber 147, the limiting member is in an unlocked position. At this point, the handle 144 can unlimitedly move along the engagement direction E.

[0130] When the connecting protrusion 146 on the handle 144 is fully inserted into the connecting groove 151, the chamber opening aligns with the catch slot 148. The user then adjusts the adjustment member 156 (e.g., by tightening the adjustment screw) to drive the movable lug 152 to move towards the chamber opening, causing the movable lug 152 to enter the catch slot 148, at which the end of the guide hole 155 close to the chamber top has not yet been blocked by the limiting pin 154, thereby positioning the handle 144 at a predetermined location. In this embodiment, when at least a portion of the movable lug 152 enters the catch slot 148, the limiting member is in a locked position. At this point, the handle 144 cannot move along the disengagement direction D.

[0131] Further, a stop block 157 may be provided at the end of the connecting groove 151 close to the second axle. The stop block 157 can block the handle 144 from continuing to move along the engagement direction E when the handle 144 is fully inserted.

[0132] This embodiment, by coupling the adjustment member (e.g., the adjustment screw) to the movable lug and adjusting the adjustment member (e.g., tightening or loosening the adjustment screw) to place the limiting member in the locked or unlocked position, achieves the engagement and disengagement of the handle and the manipulation member.

[0133] This embodiment provides a new way for the handle to engage with and disengage from the manipulation member, which is convenient for user operation and allows more accurate positioning of the handle.

[0134] FIG. 15 shows another embodiment of the present invention. Except for the limiting member, the structure of this embodiment is similar to that of Embodiment 5 and will not be reiterated here.

[0135] This embodiment may also be considered a simplified version of Embodiment 6.

[0136] As shown in FIG. 15, in this embodiment, the limiting member comprises a pin 158. A pin channel capable of accommodating the pin 158 is provided in the handle 144. The pin channel extends through the connecting protrusion 146 of the handle 144. An end is exposed out of a surface of the handle 144 away from the connecting protrusion 146, forming a pin inlet. Another end is exposed out of a mating face of the connecting protrusion 146, forming a pin outlet. A bottom of the connecting groove 151 is provided with a mating hole 159. When the connecting protrusion 146 on the handle 144 is fully inserted into the connecting groove 151, the pin outlet aligns with the mating hole 159. The user inserts the pin 158 into the pin channel, causing the pin 158 to pass through the handle 144 and insert into the mating hole 159. In this embodiment, when at least a portion of the pin 158 is inserted into the mating hole 159, the limiting member is in a locked position. At this point, the handle 144 cannot move along the disengagement direction D.

[0137] Further, a stop block 157 may be provided at the end of the connecting groove 151 close to the second axle. The stop block 157 can block the handle 144 from continuing to move along the engagement direction E when the handle 144 is fully inserted.

[0138] This embodiment achieves the locking function of the limiting member through a simplified pin form, thereby realizing the engagement of the handle and the manipulation member. It has the advantages of simple structure and cost saving.

[0139] FIGS. 16 to 17 show another embodiment of the present invention. Except for the limiting member, the structure of this embodiment is similar to that of Embodiment 5 and will not be reiterated here.

[0140] As shown in FIGS. 16 to 17, in this embodiment, the limiting member comprises a movable lug 152 and an adjustment member 156. A chamber 147 capable of accommodating the movable lug 152 is provided in the connecting protrusion 146 of the handle 144. A bottom of the connecting groove 151 is provided with a catch slot 148. The chamber 147 has a chamber opening facing the bottom of the connecting groove 151 and a chamber top opposite the chamber opening. The movable lug 152 is arranged in the chamber 147. The movable lug 152 is pivotably coupled through a third axle 160 with two ends fixed to an inner wall of the chamber 147. The movable lug 152 may be disc cam-shaped, and a contour curve of the movable lug 152 can be unfolded around the third axle 160. A second elastic member 161 is further provided on the third axle 160. An end of the second elastic member 161 abuts against the inner wall of the chamber 147, and another end is coupled to the movable lug 152. In this embodiment, the second elastic member 161 is a torsion spring. In other embodiments, the second elastic member may also be a tension spring, compression spring, etc. The size of the movable lug 152 is slightly smaller than the size of the chamber 147, so that the movable lug 152 can move in the chamber 147.

[0141] In this embodiment, the adjustment member 156 may be an adjustment screw. The adjustment member 156 serves as an actuator.

[0142] An adjustment member channel capable of accommodating the adjustment member 156 is provided in the handle 144. An end of the adjustment member channel is exposed out of a surface of the handle 144 away from the connecting protrusion 146, forming an adjustment member channel opening. Another end of the adjustment member channel communicates with the chamber 147. The adjustment member 156 is arranged in the adjustment member channel. An end of the adjustment member 156 is coupled to the movable lug 152. Another end of the adjustment member 156 passes through the handle 144 and is exposed out of the adjustment member channel opening.

[0143] The user can adjust the adjustment member 156 (e.g., by tightening or loosening the adjustment screw) to drive the movable lug 152 to rotate from the chamber opening into the catch slot 148 or to retract into the chamber 147.

[0144] When it is necessary to engage the handle 144 with the manipulation member 14, the user first adjusts the adjustment member 156 (e.g., by loosening the adjustment screw). The adjustment member 156 moves towards the adjustment member channel opening, causing the movable lug 152 to tend to disengage from the adjustment member 156. The second elastic member 161 utilizes its elastic force to drive the movable lug 152 to rotate counterclockwise about the third axle 160, causing the movable lug 152 to remain in contact with the adjustment member 156 until the movable lug 152 retracts into the chamber 147. In this embodiment, when the movable lug 152 is fully retracted into the chamber 147, the limiting member is in an unlocked position (as shown in FIG. 17), thus not hindering the continued insertion of the connecting protrusion 146 into the connecting groove 151 along the engagement direction E. At this point, the handle 144 can unlimitedly move along the engagement direction E.

[0145] When the connecting protrusion 146 on the handle 144 is fully inserted into the connecting groove 151, the chamber opening aligns with the catch slot 148. The user then adjusts the adjustment member 156 (e.g., by tightening the adjustment screw), causing the adjustment member 156 to move towards the inside of the chamber 147. The movable lug 152 is pushed by the adjustment member 156 and, overcoming the elastic force of the second elastic member 161, rotates clockwise about the third axle 160, causing at least a portion of the movable lug 152 to enter the catch slot 148, thereby positioning the handle 144 at a predetermined location. In this embodiment, when at least a portion of the movable lug 152 enters the catch slot 148, the limiting member is in a locked position (as shown in FIG. 16). At this point, the handle 144 cannot move along the disengagement direction D.

[0146] Further, a stop block 157 may be provided at the end of the connecting groove 151 close to the second axle. The stop block 157 can block the handle 144 from continuing to move along the engagement direction E when the handle 144 is fully inserted.

[0147] This embodiment, by coupling the adjustment member (e.g., the adjustment screw) to the movable lug and adjusting the adjustment member (e.g., tightening or loosening the adjustment screw) to place the limiting member in the locked or unlocked position, achieves the engagement and disengagement of the handle and the manipulation member.

[0148] This embodiment provides a new way for the handle to engage with and disengage from the manipulation member, which is convenient for user operation and allows more accurate positioning of the handle.

[0149] Preferred specific embodiments have been described in detail above. It is to be understood that, those of ordinary skill in the art can make various modifications and changes based on the concept of the present invention without exerting any creative effort. Accordingly, all the technical solutions that can be obtained by those skilled in the art by logical analysis, inference or limited experimentation in accordance with the concept of the present invention on the basis of the prior art are intended to fall within the protection scope as defined by the claims.