JP4758745B2 - Cutting tool - Google Patents

Description

  The present invention relates to a cutting tool mainly used manually.

In this type of prior art, like the double gutter type shear rod of Patent Document 1 shown in FIG. 5, the rod piece 12 is pivotally attached by a fulcrum pin 18 closer to the tip than the central portion, and the handle 15 is pivoted. 16, the rear end of the collar piece 12 and the tip of the handle 15 are pivoted by a pin 14, the gripping force at the handle 15 is increased at the pin 14, and the cutting edge 12 b of the collar piece 12 is further increased. In order to generate a large shear force.
Published by Gihodo Co., Ltd. “Mechanical motion mechanism, Chapter 13 Booster mechanism, 706 Double shearing shearing machine”

In the prior art, the gripping force can be doubled and sheared by the hook piece 12, but when the material to be cut is a tough wire element or a stranded wire, the hook piece 12 may be bent and elastically deformed. Since it is difficult to continue applying a force against the deformation restoring force to the handle, it may be difficult to complete the cutting easily and quickly.
An object of the present invention is to provide a cutting tool that can solve such problems of the prior art.
An object of the present invention is to provide a cutting tool that makes it possible to perform simpler and more reliable cutting by using a restoring force of elastic deformation received by a cutting blade from a material to be cut as a cutting force.

Specific means for solving the problems in the present invention are as follows.
First, a pair of cutting blades 2 are pivotally connected by a connecting member 3 so as to be openable and closable, and a tip of a handle 5 is pivotally attached to a base portion 2a of each cutting blade 2 via a blade pivoting member 4. The handle 5 is pivotally attached by a handle pivoting member 6 so that it can be opened and closed.
When the pair of handles 5 is changed from the open state to the closed state, the handle pivot member 6 is set at a position that crosses the center line S connecting the pair of blade pivot members 4 from the handle 5 side to the cutting blade 2 side. ing.

  Secondly, the handle 5 is closed on the pair of handles 5 at a position where the handle pivot member 6 crosses the center line S connecting the pair of blade pivot members 4 from the handle 5 side to the cutting blade 2 side. A stopper 7 for stopping is provided.

  According to the present invention, the cutting blade 2 is elastically deformed when it is difficult to complete the cutting of the material to be cut. The restoring force due to the elastic deformation is applied to the handle pivoting member 6 and the centerline S of the blade pivoting member 4. By traversing from the handle 5 side to the cutting blade 2 side, the cutting blade 2 can be caused to act as a cutting force, whereby the material to be cut can be cut more reliably.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1-4, the cutting tool 1 which can cut | disconnect tough to-be-cut | disconnected material of a wire strand or a strand wire, for example is illustrated.
In the cutting tool 1, a pair of cutting blades 2 are pivotally connected by a connecting member 3 so as to be openable and closable, and a distal end of a handle 5 is pivotally attached to a base portion 2 a of each cutting blade 2 via a blade pivoting member 4. The handle 5 is pivotally attached to the handle pivotable member 6 so as to be openable and closable.
Each cutting blade 2 has a blade portion 2b formed at the tip, and the base portion 2a side is inclined away from the blade portion 2b and gradually becomes thinner. A pair of cutting blades 2 are arranged to face each other so that the blade portions 2 b face each other, and a pair of connecting members 3 formed of plate pieces are arranged on both sides of the pair of cutting blades 2.

The pair of connecting members 3 sandwich the pair of cutting blades 2 on the side of the blade portion 2b from the longitudinal center of the cutting blade 2, and pivotally connect the pivoting member 8 formed of bolts to both. Yes. Therefore, the cutting blade 2 swings around the pivot member 8 and opens and closes to cut the material to be cut.
In the cutting blade 2, the distance from the connecting member 3 to the base 2 a is longer than the distance from the connecting member 3 to the tip of the blade 2 b so that the lever action force acts on the blade 2 b. The tip of a handle 5 is pivotally attached to 2a via a blade pivot attachment member 4.
The pair of handles 5 are formed with pivoting portions 5a projecting in the opposite inward direction at the tips, and the pivoting portions 5a of both handles 5 are opened and closed by a handle pivoting member 6 formed of bolts (solid line in FIG. 2). It can be pivoted to change from a state to a two-dot chain line state). Note that one pivoting portion 5a of the handle 5 has a bifurcated shape, and the other pivoting portion 5a has a bifurcated shape.

Each of the handles 5 has a bell crank shape because it has a pivot portion 5a, and the handle pivot member 6 forms a fulcrum and the blade pivot member 4 forms an action point. Is connected to the cutting blade 2, the handle pivoting member 6 moves around the blade pivoting member 4 by opening and closing the handle 5.
The handle pivoting member 6 has a center line S that connects the pair of blade pivoting members 4 when the pair of handles 5 are closed (indicated by solid lines in FIGS. 1 and 3 and indicated by a two-dot chain line in FIG. 2). Is located on the cutting blade 2 side by a slight dimension Q.

Therefore, when the pair of handles 5 are changed from the open state (shown by solid lines in FIG. 2) to the closed state, the handle pivot member 6 moves the center line S connecting the pair of blade pivot members 4 from the handle 5 side. Crossing to the cutting blade 2 side. Further, the positions of the blade pivoting member 4 and the handle pivoting member 6 in the handle 5 are set so as to cross the center line S from the handle 5 side to the cutting blade 2 side.
The pair of handles 5 is provided with a stopper 7 that protrudes in an opposing inward direction toward the grip portion 5 b from the handle pivot member 6. The both stoppers 7 abut on the center line S connecting the pair of blade pivot members 4 from the handle 5 side to the cutting blade 2 side, and the both stoppers 7 abut. As a result, the closing operation of the handle 5 is stopped.

Next, the cutting operation of the cutting tool 1 having the above-described configuration will be described.
When the pair of cutting blades 2 are used to cut a workpiece such as a wire, the pair of cutting blades 2 hold the pair of handles 5 and change them from an open state to a closed state. , The base 2a of the cutting blade 2 is moved in the opposite outward direction, and the cutting blade 2 is closed.
When the cutting blade 2 gradually bites into the workpiece by the closing operation and the handle pivot member 6 substantially reaches the center line S connecting the pair of blade pivot members 4, the pair of cutting blades 2 come into contact with each other. More precisely, the pair of cutting blades 2 come into contact slightly before the handle pivot member 6 reaches the center line S connecting the pair of blade pivot members 4.

When the handle pivot member 6 reaches the center line S connecting the pair of blade pivot members 4, if the workpiece is soft, the cutting is completed, but the workpiece is tough. The cutting blade 2 undergoes elastic deformation (escape) between the pivot member 8 and the blade pivot member 4, and the elastic deformation produces a restoring force in the opening direction of the pair of handles 5.
When the handle pivoting member 6 crosses the cutting blade 2 side from the handle 5 side over the center line S connecting the pair of blade pivoting members 4, the cutting blade 2 passes through the theoretically completely closed state. A restoring force is generated in a direction in which the blade 2 is completely brought into contact with the blade portion 2 a side, and a force in a direction to open the handle 5 acts in a direction to close the handle 5. Then, the restoring force of the elastic deformation becomes a cutting force in the direction of closing the cutting blade 2, and the blade portion 2a is further digged into the tough object to be cut that has not been completed, thereby completing the cutting.

Moreover, after the handle pivoting member 6 crosses the center line S, the restoring force of the elastic deformation of the cutting blade 2 acts in the direction of closing the handle 5, so that the closing operation of the handle 5 is stopped by the stopper 7. The cutting force is maintained, and the tough object to be cut is more reliably cut by the restoring action of the cutting blade 2 that has been elastically deformed.
In the contact state of the cutting blade 2 in a state in which the workpiece is cut, it is preferable that the restoring force of the elastic deformation of the cutting blade 2 remains.
In the present invention, the shape of each member and the positional relationship between the front, rear, left, and right in the embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.

For example, the stopper 7 may be formed on one of the pair of handles 5 so as to contact the other, and the blade pivot member 4, the handle pivot member 6 and the pivot member 8 are formed of bolts. Although the nut is screwed to prevent it from coming off, it may be formed by a pin or a headed pin and stopped by crimping its end.
Although the cutting tool 1 is mainly used manually, it can be configured to open and close the pair of handles 5 via the driving means.

It is an enlarged front view of the principal part which shows embodiment of this invention. It is explanatory drawing which shows the movement of a handle pivot attachment member. It is the same whole front view. It is the same whole top view. It is a perspective view which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Cutting blade 2a Base 2b Blade part 3 Connecting member 4 Blade pivoting member 5 Handle 5a Pivoting part 6 Handle pivoting member 7 Stopper 8 Pivoting member S Center line

Claims (2)

A pair of cutting blades (2) are pivotally connected by a connecting member (3) so that they can be opened and closed, and the tip of the handle (5) is connected to the base (2a) of each cutting blade (2) via the blade pivoting member (4). Is pivotally attached, and the pair of handles (5) is pivotally attached to the handle pivotable member (6) so as to be opened and closed.
When the handle pivot member (6) changes the pair of handles (5) from the open state to the closed state, the center line (S) that connects the pair of blade pivot members (4) from the handle (5) side. A cutting tool characterized in that it is set at a position that crosses the cutting blade (2).   In the pair of handles (5), the handle pivot member (6) crosses the center line (S) connecting the pair of blade pivot members (4) from the handle (5) side to the cutting blade (2) side. The cutting tool according to claim 1, wherein a stopper (7) for stopping the closing operation of the handle (5) at a position is provided.

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