JP7032245B2 - Shearing tool - Google Patents

Description

The present disclosure relates to shear tools.

Conventionally, a shear tool for cutting the head of a rivet driven into a wall, a roof, or the like is known (see, for example, Patent Document 1 and Patent Document 2).
These conventional techniques include a pair of rotating members that can rotate so as to sandwich an object to be cut such as a rivet, and a blade is provided on both or one of them, and the rotating member is rotated to rotate the blade portion. It is designed to cut the rivet with. Further, both rotating members are provided with an arm for transmitting the operating force, and the arm arranges the position where the operating force is input far from the center of rotation to obtain a lever ratio according to the length of the arm. Obtainable.

Japanese Unexamined Patent Publication No. 50-101985 Jikkai Sho 54-14791 No.

However, in the above-mentioned conventional shear tool, the length of the arm becomes long in order to obtain a large cutting force, and depending on the working environment, it may not be possible to secure a space for rotating the long arm.
On the other hand, if the length of the arm is shortened so that the work can be performed even in a narrow place, the lever ratio obtained becomes small, and it becomes difficult to obtain a sufficient cutting force.

The present disclosure has been made focusing on the above-mentioned problems, and an object of the present invention is to provide a shearing tool capable of obtaining a sufficient cutting force while being able to work even in a narrow place.

To this end, the shear tools of the present disclosure are:
A cutter portion having a pair of relative rotatable cutter members and capable of cutting an object to be cut arranged between the cutting edge portions formed on each cutter member.
A pair extended from the center of rotation so as to apply rotational power to each cutter member so as to perform cutting by the double-edged cutting edge portion and to transmit an operating force based on the lever ratio to the cutting edge portion as an action point. Arm and
A single connecting shaft member in which a pair of the arms are rotatably connected to each other, and a movement that is interposed between at least one of both arms and the connecting shaft member and is movable along the connecting shaft member. An arm operating unit having a member and having the moving member move along the connecting shaft member to input the operating force to the arm.
Equipped with
A handle that can be gripped at a position separated in the direction along the rotation center axis of the arm is provided.
A cover member for suppressing the scattering of the object to be cut, which is cut by the double-edged edge portion, is provided.
The cover member is
A first cover member attached to the handle and provided so as to face the cutter portion with a space between the cutter portion and the first cover member.
Shearing including a second cover member that covers the space between the first cover member and the cutter portion and is attached to the cutter portion so as to be able to follow the rotation of the cutter member. It was a tool.

With the above configuration, the shear tool of the present disclosure can work even in a narrow place and can obtain a sufficient cutting force. Further, by providing a handle, workability is excellent. Further, by providing the cover member composed of the first cover member and the second cover member, the scattering of the object to be cut can be suppressed in all directions, and the usability is excellent.

It is a front view which shows the shearing tool A of embodiment. It is a side view which shows the shearing tool A of embodiment. It is a figure which shows the connection part of the arm 21 and the slider 32 in the shearing tool A of Embodiment 1, and shows the state which saw the slider 32 and the arm 21 from the direction along the axial direction of the connection shaft member 31. FIG. 3 is a front view of the first slider 32 of the shear tool A of the first embodiment as viewed from the front in the same direction as FIG. FIG. 5 is a side view of the first slider 32 of the shear tool A of the first embodiment as viewed from a direction along the axial direction of the connecting shaft member 31. FIG. 1 is a plan view of the first slider 32 of the shear tool A of the first embodiment as viewed from above in FIG. It is a top view which shows the upper protection cover 51 of the cover member 50 of the shear tool A of Embodiment 1. FIG. It is a top view which shows the end surface of the side cover 52 of the cover member 50 of the shear tool A of Embodiment 1. FIG. FIG. 5 is a front view of the side cover 52 of the cover member 50 of the shear tool A of the first embodiment as viewed from the extending direction of the cutting edge portions 11b and 12b. It is an operation explanatory view of the shearing tool A of Embodiment 1, and shows the work of removing a gasket 320 from a building H. It is an operation explanatory view of the shearing tool A of Embodiment 1, and shows the work of removing the outer wall panel 300 from a building H. It is an operation explanatory view of the shearing tool A of Embodiment 1, and shows the state which formed the gap 500 between the outer wall panel 300 and the pillar 310. It is an operation explanatory view of the shearing tool A of Embodiment 1, and shows the state which expanded the gap 500 further from the state of FIG. 7C.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
First, the structure of the shear tool A of the embodiment will be described.
FIG. 1 is a front view showing a shear tool A.
The shear tool A includes a cutter portion 10, an arm portion 20, an arm operating portion 30, a handle 40, and a cover member 50.

(Cutter part)
First, the cutter portion 10 will be described.
The cutter portion 10 has a plate-shaped first cutter piece 11 and a second cutter piece 12 as cutter members. Each of the cutter pieces 11 and 12 is rotatably supported around the rotation support shafts 11a and 12a that are raised and fixed to the plate-shaped cutter piece support member 13, and the cutting edge portions of both cutter pieces 11 and 12 are supported. The rivet 100 (see FIG. 7D), which will be described later, is cut by 11b and 12b.

Further, both the cutter pieces 11 and 12 are provided with lever portions 11c and 12c extending from the rotation support shafts 11a and 12a on the side opposite to the cutting edge portions 11b and 12b, and the rotation of the tips of the lever portions 11c and 12c described later. The operating force is input from the connecting shaft 26. Here, in the cutter pieces 11 and 12, the rotation support shafts 11a and 12a and the lever portion which is the force point rather than the distance from the rotation support shafts 11a and 12a at the center of rotation to the cutting edge portions 11b and 12b which are the points of action. The distance between the tips of 11c and 12c and the rotary connecting shaft 26 is longer. Therefore, at the cutting edge portions 11b and 12b, which are the points of action, a large force can be obtained by obtaining a lever ratio based on the ratio of the distance to the operating force input to both the cutter pieces 11 and 12.

Further, as shown in FIG. 2, the cutter pieces 11 and 12 have lever portions 11c and 12c tilted at an angle θ with respect to the cutting edge portions 11b and 12b. That is, when the cutting edge portions 11b and 12b are aligned with the installation surface 200 such as a wall surface on which the rivet 100 to be cut is provided, the arm portion 20 and the arm operation portion 30 are arranged apart from the installation surface 200. It has become like.

Further, on the back surface of the cutter piece support member 13, a seat member 14 is attached so that the entire cutting edge portions 11b and 12b are brought into contact with each other along the installation surface 200 as shown in FIG. That is, in the cutter piece support member 13, the end surface 13a located on the lower side of FIG. 2 and the lower end surface 14a of the seat member 14 have the above-mentioned angle θ with respect to the surface located on the side of the cutter pieces 11 and 12. It is inclined to form and is arranged along the cutting edge portions 11b and 12b.

Therefore, when the entire surface of the end surface 13a of the cutter piece support member 13 and the end surface 14a of the seat member 14 is brought into contact with the installation surface 200, the cutting edge portions 11b and 12b of the cutter pieces 11 and 12 come into contact with the installation surface 200 over the entire length thereof. It is arranged along.

(Arm part)
Next, the arm portion 20 will be described.
The arm portion 20 is a portion that performs an operation of applying rotational power to the lever portions 11c and 12c, and as shown in FIG. 1, the arm portion 20 is connected to the first arm 21 connected to the lever portion 11c and the lever portion 12c. A second arm 22 is provided.

Each of the arms 21 and 22 has the same configuration, and each includes a plate-shaped arm main body 23 and a plate member 24 provided integrally with the arm main body 23 with the arm main body 23 interposed therebetween.
The arm bodies 23 and 23 are rotatably connected to each other about the rotation shaft 25. Then, one end of the arm bodies 23 and 23 is rotatably connected to the lever portions 11c and 12c by the rotary connecting shaft 26, and the other end side is integrally connected to the plate member 24.

As shown in FIG. 3, the plate member 24 is formed by arranging two plate members side by side and sandwiching the arm main body 23. The sliders 32 and 33 of the arm operation unit 30, which will be described later, are rotatably connected to the tip of the plate member 24. The sliders 32 and 33 and the direction of rotation thereof will be described later.

In the arm portion 20 described above, in FIG. 1, the first arm 21 rotates clockwise around the rotation shaft 25, and the second arm 22 rotates counterclockwise around the rotation shaft 25. When moved, the cutter pieces 11 and 12 rotate so as to cut at the cutting edge portions 11b and 12b.

Here, each of the arms 21 and 22 is a tip portion of the plate member 24 which is a point of effort described later with the rotation shaft 25 rather than the distance between the rotation connection shaft 26 which is the point of action and the rotation shaft 25 which is the center of rotation. The distance to and is formed longer. Therefore, in each of the arms 21 and 22, in the rotation connecting shaft 26 which is the point of action, it is possible to obtain a rotational power larger than the operating force input to the plate member 24 by the lever ratio based on the above-mentioned distance ratio. ..

(Arm operation unit)
Next, the arm operation unit 30 will be described.
The arm operating unit 30 transmits an operating force for rotating the pair of arms 21 and 22 to the arm unit 20, and the connecting shaft member 31 connected to each arm 21 and 22 and the first moving member. The slider 32 and the second slider 33 are provided.

The connecting shaft member 31 is formed in the shape of a rod having a circular cross section. A first male screw 31a and a second male screw 31b are formed on the outer periphery of the connecting shaft member 31 with an intermediate portion in the axial direction interposed therebetween. The first male screw 31a and the second male screw 31b are spiral male screws, respectively, but the directions of the spirals are opposite. Here, the first male screw 31a is a left-handed screw and the second male screw. The male screw 31b is a right-handed screw.
Further, nuts 31c and 31d are fixed to both ends of the connecting shaft member 31, and nuts 31e as stoppers are fixed to an intermediate portion in the axial direction of the connecting shaft member 31.

The first slider 32 and the second slider 33 have female screws 32a and 33a formed on the inner circumferences thereof, respectively. That is, the first slider 32 is mounted on the outer circumference of the first male screw 31a by engaging the female screw 32a with the first male screw 31a. Similarly, the second slider 33 is mounted on the outer circumference of the second male screw 31b by engaging the female screw 33a with the second male screw 31b.

4A, 4B, and 4C show the first slider 32. In these figures, the first slider 32 is shown, but since both sliders 32 and 33 have the same configuration, it is assumed that the second slider 33 is also shown in parentheses. The code is also shown.

4A is a front view of the first slider 32 as viewed from the front in the same direction as FIG. 1, and FIG. 4B is a side view of the first slider 32 as viewed from the axial direction of the connecting shaft member 31. FIG. 4C is a plan view of the first slider 32 as viewed from above in FIG.

As shown in FIGS. 4A to 4C, the slider 32 includes a slider main body 321 and a pair of connecting shafts 322 and 322.
The slider main body 321 is formed in a substantially cylindrical shape, and a screw hole 321a is formed in a direction orthogonal to the axis of the cylinder. The female screw 32a described above is formed on the inner circumference of the screw hole 321a.

The connecting shaft 322 projects at the axial center positions of both end faces of the slider main body 321 in a direction along the axial center. As shown in FIG. 3, both connecting shafts 322 and 322 are rotatably supported by a pair of plates of the plate members 24 of each arm 21 and 22. That is, the arms 21 and 22 are rotatably connected to the sliders 32 and 33 about the connecting shaft 322 facing in the direction orthogonal to the central axis of the connecting shaft member 31.

As described above, since the slider main body 321 is supported by the plate member 24, when the connecting shaft member 31 is rotated about its axis, the sliders 32 and 33 move along the connecting shaft member 31. .. Since the directions of the spirals of the first male screw 31a and the second male screw 31b of the connecting shaft member 31 are opposite to each other, when the connecting shaft member 31 is rotated, the sliders 32 and 33 are moved. It slides in the opposite direction along the connecting shaft member 31.

For example, when the connecting shaft member 31 is rotated in one of the clockwise direction and the counterclockwise direction, the sliders 32 and 33 approach each other, for example, as shown by arrows M1 and M2 in FIG. Move like. Further, when the connecting shaft member 31 is rotated in the opposite direction, the sliders 32 and 33 move in the directions opposite to the arrows M1 and M2 so that the two sliders 32 and 33 are separated from each other.

Therefore, when the sliders 32 and 33 move in the directions of the arrows M1 and M2 in FIG. 1 so as to be relatively close to each other, in the arm portion 20, the first arm 21 rotates in the clockwise direction in FIG. , The second arm 22 rotates counterclockwise in FIG. Therefore, in the cutter portion 10, both cutter pieces 11 and 12 cut the object to be cut between the cutting edge portions 11b and 12b.

On the contrary, when the sliders 32 and 33 move in a direction opposite to the arrows M1 and M2 in FIG. 1 and in a direction relatively distant from each other, in the arm portion 20, the first arm 21 moves in the counterclockwise direction in FIG. The second arm 22 rotates clockwise in FIG. 1. Therefore, in the cutter portion 10, both cutter pieces 11 and 12 rotate so that the cutting edge portions 11b and 12b are separated from each other.
Further, when the sliders 32 and 33 move with respect to the rotation of the connecting shaft member 31, the sliders 32 and 33 decelerate and move with respect to the rotation speed of the connecting shaft member 31. Therefore, the operating force (torque) is increased and transmitted from the sliders 32 and 33 to the arms 21 and 22.

(Handle)
Next, the handle 40 will be described.
The handle 40 is used to hold the shear tool A when cutting an object to be cut such as a rivet 100. As shown in FIG. 2, the handle 40 is formed in a substantially L shape by the grip portion 41 and the connecting portion 42.

The grip portion 41 is a portion to be gripped by an operator, and is arranged at a position separated from the lever portions 11c and 12c and the arm portion 20 in a direction along the axis of the rotation shaft 25 of the arm portion 20. Further, the connecting portion 42 is fixed to the cutter piece support member 13 by welding or the like.

(Cover member)
Next, the cover member 50 will be described.
The cover member 50 is for preventing members on the separated side of the object to be cut, such as the head of the rivet 100, from scattering, and as shown in FIG. 1, the upper protective cover 51 as the first cover member and the upper protective cover 51. A side cover 52 as a second cover member is provided.

As shown in FIG. 5, the upper protective cover 51 includes a main body 51a and a connecting piece 51b. The main body 51a is formed in a thin plate shape having a hexagonal plane shape. Further, the connecting piece 51b is projected outward from the longest side of the main body 51a, and is fixed to the handle 40 by the binding member 53 as shown in FIG. The upper protective cover 51 is made of a resin such as vinyl.

As shown in FIG. 2, the side cover 52 is provided so as to cover the space between the upper protective cover 51 and the portions of the cutter pieces 11 and 12 where the cutting edge portions 11b and 12b are provided. The side cover 52 includes a pair of side wall portions 52a and 52b shown in FIG. 6A, and a back wall portion 52c connecting one ends of both side wall portions 52a and 52b.

As shown in FIG. 1, the side wall portions 52a and 52b are formed in a shape that can follow the outside of the cutter pieces 11 and 12, and the screws 54 are attached to the bracket portions 11d and 12d provided on the cutter pieces 11 and 12, respectively. Is attached by. Further, the back wall portion 52c is provided along the back surface of the connecting portion 42 of the handle 40.
Further, the side cover 52 is formed of a resin plate having a certain strength such as an acrylic plate, and can be deformed by following the rotation of the cutter pieces 11 and 12.

(Action of embodiment)
Next, the operation of the embodiment will be described with reference to FIGS. 7A to 7D.
In order to explain the operation, a procedure of cutting the rivet 100 in which the existing outer wall panel 300 is fixed to the pillar 310 (see FIG. 7C) when the outer wall panel 300 of the building H is replaced will be described.

First, as shown in FIG. 7A, the gasket 320 provided at the edge of the outer wall panel 300 of the building H is removed using pliers 410.
Next, as shown in FIG. 7B, the lower end portion of the existing outer wall panel 300 to be replaced is peeled off from the pillar 310 as shown in FIG. 7C by using the jig 420 for removing the outer wall panel 300, and the outer wall panel is removed. A gap 500 is formed between the 300 and the pillar 310. At this time, the protective sheet 430 is arranged between the jig 420 and the adjacent outer wall panel 300b so as not to damage the panel 300b.

Next, the shear tool A is inserted into the gap 500 from the lower end side of the outer wall panel 300. In this case, the gap 500 is inserted from the cutter pieces 11 and 12 of the cutter portion 10, and the rivet 100 is inserted between the cutting edge portions 11b and 12b of the cutter pieces 11 and 12. Further, the end surface 14a of the seat member 14 of the cutter portion 10 is aligned with the pillar 310 as the installation surface 200 so that the cutting edge portions 11b and 12b form a right angle with respect to the direction along the axis of the rivet 100.

Next, the operator grips the grip portion 41 of the handle 40 with one hand, and while holding the shear tool A, engages an impact wrench (not shown) with either of the nuts 31c and 31d to engage the connecting shaft member. 31 is rotated in a predetermined direction.
Due to the rotation of the connecting shaft member 31, the sliders 32 and 33 meshed with the male screws 31a and 31b move in the directions of the arrows M1 and M2 in FIG. Rotational connection shafts 26, 26 rotate so as to be separated from each other. Then, with the rotation of the arm portion 20, the cutter pieces 11 and 12 rotate, and the rivet 100 is cut by the cutting edge portions 11b and 12b.
The maximum stroke of the arms 21 and 22 at this time is regulated by the slide of the slider 33 being regulated by the nut 31e.

Further, at the time of the above cutting, in each of the arms 21 and 22, the position of the sliders 32 and 33 at one end, the distance between the rotation shaft 25 at the center of rotation, and the distance between the rotation shaft 25 and the rotation connection shaft 26 are determined. The lever ratio based on is obtained. Further, also in the cutter pieces 11 and 12, the distance between the rotation connecting shafts 26 and 26 on the input side and the rotation support shafts 11a and 12a at the center of rotation, and the rotation support shafts 11a and 12a and the cutting edge portions 11b and 12b. The lever ratio based on the distance to the cut portion is obtained.
In addition, between the connecting shaft member 31 and the sliders 32 and 33, the rotational movement between the male screws 31a and 31b and the female screws 32a and 33a is decelerated when the slides of the sliders 32 and 33 are converted. By doing so, the torque increases.
Due to the above lever ratio and deceleration, even if the lengths of the arms 21 and 22 are short, a large cutting force can be obtained at the cutting edge portions 11b and 12b.

After cutting the rivet 100 as described above, the connecting shaft member 31 is rotated in the direction opposite to that at the time of cutting by an impact wrench (not shown), and the sliders 32 and 33 are referred to as the arrows M1 and M2 in FIG. Slide in the opposite direction. As a result, in the shear tool A, as shown in FIG. 1, the cutting edge portions 11b and 12b of the cutter pieces 11 and 12 return to a state in which they are separated from each other. Further, the movement of the sliders 32 and 33 at this time can be regulated by the nuts 31c and 31d.

(Effect of embodiment)
The effects of the shear tool A of the embodiment are listed below.
(1) The shear tool A of the embodiment is
A pair of cutter pieces 11 and 12 that can rotate relative to each other are provided, and an object to be cut such as a rivet 100 arranged between the cutting edge portions 11b and 12b formed on the cutter pieces 11 and 12 can be cut. Cutter part 10 and
Rotation is applied to each cutter piece 11 and 12 so as to perform cutting by both cutting edges 11b and 12b, and the operating force based on the lever ratio is transmitted to the cutting edge 11b and 12b as the point of action. A pair of arms 21 and 22 extended from the central rotation shaft 25, and
One connecting shaft member 31 in which a pair of arms 21 and 22 are connected so as to be relatively rotatable, and an interposition between both arms 21 and 22 and a connecting shaft member 31 and moving along the connecting shaft member 31. An arm operating unit 30 having sliders 32, 33 as possible moving members, and having the sliders 32, 33 move along the connecting shaft member 31 to input an operating force to the arms 21 and 22.
To prepare for.
Therefore, the cutting force at the cutting edge portions 11b and 12b depends not only on the lever ratio depending on the length of the arms 21 and 22 but also on the operating force on the sliders 32 and 33. Therefore, by increasing the operating force input to the sliders 32 and 33, it is possible to shorten the arms 21 and 22 to enable work in a narrow place and to obtain a sufficient cutting force.

(2) The shear tool A of the embodiment is
The arm operating unit 30 has a deceleration mechanism that decelerates and transmits the operating force to the sliders 32 and 33.
Therefore, the deceleration mechanism can increase the operating force to the sliders 32 and 33 and transmit it, and secure the cutting force at the cutting edge portions 11b and 12b without lengthening the arms 21 and 22 as in (1) above. Can be done.

(3) The shear tool A of the embodiment is
The arm operation unit 30 serves as a deceleration mechanism.
Male screws 31a and 31b formed on the outer circumference of the connecting shaft member 31 and
A female screw 32a, 33a formed on the sliders 32, 33 and meshing with the male screw 31a, 31b is provided.
The sliders 32 and 33 are formed so as to be movable along the connecting shaft member 31 by the rotation of the connecting shaft member 31.
Therefore, although the structure is compact, the sliders 32 and 33 can be decelerated and moved with respect to the rotation speed of the connecting shaft member 31.

(4) The shear tool A of the embodiment is
The arm operation unit 30 is
A pair of sliders 32, 33 to which a pair of arms 21 and 22 are connected, respectively, are provided.
The connecting shaft member 31 includes a pair of male screws 31a and 31b formed at different positions along the axial direction, and the male screws 31a and 31b are formed in opposite directions to each other.
The pair of sliders 32, 33 are formed with female screws 32a, 33a in a spiral direction corresponding to the male screws 31a, 31b that mesh with each other.
Therefore, when the connecting shaft member 31 is rotated, both sliders 32 and 33 slide in opposite directions, and can rotate the arms 21 and 22 to narrow the distance between them and widen the distance between them. As a result, the cutting operation by the cutting edge portions 11b and 12b and the operation in the opposite direction can be performed.
Therefore, as compared with the case where only one of the arms 21 and 22 is rotated, the required movement amount of the sliders 32 and 33 can be suppressed, and an efficient cutting operation can be performed.

(5) The shear tool A of the embodiment is
A handle 40 that can be gripped at a position separated in a direction along the rotation center axis (axis center of the rotation shaft 25) of the arms 21 and 22 is provided.
Therefore, the operator can rotate the connecting shaft member 31 while holding the handle 40 and holding the shear tool A, which is excellent in workability.
Further, since the handle 40 is formed in a substantially L shape by the grip portion 41 and the connecting portion 42 and is arranged apart from the arms 21 and 22 and the cutter pieces 11 and 12, for example, when not in use, the handle 40 is gripped. The portion 41 can be inserted into a pocket of a scaffold or the like and held. As a result, it is possible to prevent the fall and it is excellent in usability.

(6) The shear tool A of the embodiment is
A cover member 50 is provided with both cutting edge portions 11b and 12b to suppress scattering of the object to be cut.
Therefore, it is possible to suppress the scattering of the object to be cut such as the head of the cut rivet 100, and the usability is excellent.

(7) The shear tool A of the embodiment is
The cover member 50 is
An upper protective cover 51 as a first cover member, which is attached to the handle 40 and is provided so as to face the cutter portion 10 by opening a space between the cutter portion 10 and the handle 40.
A side cover 52 as a second cover member, which is attached to the cutter portion 10 so as to cover the space between the upper protective cover 51 and the cutter portion 10 and is formed so as to be able to follow the rotation of the cutter member 10. Be prepared.
Therefore, when the object to be cut such as the rivet 100 is cut, the entire circumference of the cutter portion 10 can be covered, and the scattering of the head of the rivet 100 or the like can be prevented more reliably. That is, the upper protective cover 51 covers the direction facing the cutter pieces 11 and 12, and between the upper protective cover 51 and the cutter pieces 11 and 12, the side wall portions 52a and 52b of the side cover 52 and the back wall portion 52c form a space between the upper protective cover 51 and the cutter pieces 11 and 12. It surrounds the entire circumference and can prevent scattering in all directions.
In particular, in the embodiment, when the cutting edge portions 11b and 12b come into contact with each other, the side wall portions 52a and 52b of the side cover 52 attached to the cutter pieces 11 and 12 are in contact with each other as shown in FIG. 6B. It is designed to come into contact. Therefore, the above-mentioned scattering prevention can be performed more reliably.
In addition, the side cover 52 is formed of an acrylic plate, and damage due to scattering of the head of the rivet 100 or the like can be suppressed.

Although the shearing tool of the embodiment has been described above, the shearing tool of the present invention is not limited to the present embodiment and can be appropriately changed without changing the gist of the present invention.
For example, a rivet is shown as an object to be cut, but the object to be cut is not limited to this, and other members such as nails and screws can also be cut in the shear direction.
Further, in the embodiment, the cutter member provided with the cutting edge portion and the arm are shown as separate bodies, but the arm may be integrated with the cutter member. In the embodiment, the lever ratio can be obtained in two stages by forming the cutter member and the arm separately.

Further, in the embodiment, although both of the pair of arms slide with respect to the connecting shaft member, only one of the pair of arms may slide with respect to the connecting shaft member. For example, a pair of arms may have a slider in which one is rotatably connected to the connecting shaft member and only the other has a female screw that meshes with the male screw of the connecting shaft member, as in the embodiment. It may be rotatably connected via. In this case, only one of the pair of arms slides with respect to the connecting shaft member, but both arms can rotate relatively to perform cutting by the pair of cutting edges.

Further, in the embodiment, an example in which an impact wrench is used to rotate the connecting shaft member has been shown, but the present invention is not limited to this, and the connecting shaft member may be rotated manually. For example, a handle may be extended in the outer diameter direction from the connecting shaft member, and the handle may be held to rotate the handle.
Further, in the embodiment, a male screw and a female screw are used to move the moving member along the connecting shaft member, but the structure for moving the moving member is not limited to this. A rack may be provided on the connecting shaft member, a pinion may be provided on the moving member, and the pinion may be rotated.

10 Cutter part 11 (1st) Cutter piece (cutter member)
11b Cutting edge 12 (second) cutter piece (cutter member)
12b Cutting edge part 20 Arm part 21 (1st) arm 22 (2nd) arm 25 Rotating shaft 26 Rotating connecting shaft 30 Arm operating part 31 Connecting shaft member 31a 1st male screw 31b 2nd male screw 32 (First) slider (moving member)
32a Female screw 33 (second) slider (moving member)
33a Female screw 40 Handle 50 Cover member 51 Upper protective cover (first cover member)
52 Side cover (second cover member)
100 rivets (object to be cut)
A Shearing tool (of the embodiment)

Claims (3)

A cutter portion having a pair of relative rotatable cutter members and capable of cutting an object to be cut arranged between the cutting edge portions formed on each cutter member.
A pair extended from the center of rotation so as to apply rotational power to each cutter member so as to perform cutting by the double-edged cutting edge portion and to transmit an operating force based on the lever ratio to the cutting edge portion as an action point. Arm and
A single connecting shaft member in which a pair of the arms are rotatably connected to each other, and a movement that is interposed between at least one of both arms and the connecting shaft member and is movable along the connecting shaft member. An arm operating unit having a member and having the moving member move along the connecting shaft member to input the operating force to the arm.
Equipped with
A handle that can be gripped at a position separated in the direction along the rotation center axis of the arm is provided.
A cover member for suppressing the scattering of the object to be cut, which is cut by the double-edged edge portion, is provided.
The cover member is
A first cover member attached to the handle and provided so as to face the cutter portion with a space between the cutter portion and the first cover member.
Shearing including a second cover member that covers the space between the first cover member and the cutter portion and is attached to the cutter portion so as to be able to follow the rotation of the cutter member. tool. In the shearing tool according to claim 1,
The arm operation unit is
The male screw formed on the outer circumference of the connecting shaft member and
A female screw, which is formed on the moving member and meshes with the male screw, is provided.
A shear tool in which the moving member is formed so as to be movable along the connecting shaft member by the rotation of the connecting shaft member. In the shearing tool according to claim 2,
The arm operation unit is
The pair of moving members, each of which is connected to the pair of arms, are provided.
As the male screw, a pair of the male screws formed at different positions along the axial direction in the connecting shaft member are provided, and each male screw is formed with the spiral directions opposite to each other.
The pair of moving members is a shearing tool in which the female screw in a spiral direction corresponding to each meshing male screw is formed.

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