JP2001315065A - Pliers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve handiness of pliers of a structure opening and closing a pair of jaw parts by relatively rotating a pair of arms. SOLUTION: The pliers are provided with a cam 1 attached to a first arm 3A, and an abutted part 32 provided on a second arm 3B to be abutted by this cam 1. The cam 1 can be switched to a first position wherein the first and second arms 3A and 3B block the pair of jaw parts 30a and 30b from rotating in an opening direction by abutting to the abutted part 32 and to a second position avoiding abutment with the abutted part 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a plier as a kind of hand tool.

[0002] The pliers referred to in this specification mean hand tools having a function of sandwiching wires or other desired articles or members, and are generally referred to as "pliers". electrician's pliers). Also included are pliers (long-nose pliers) with elongated tips called “radio pliers”. Further, the pliers referred to in this specification include those having other functions such as a cutting function in addition to a function of sandwiching a desired article or member. Therefore, even if it is configured as a nipper for cutting a desired member, it has a pair of jaws, and it is possible to sandwich a desired article or member using the pair of jaws. If present, this nipper is included in the concept of pliers referred to herein.

[0003]

2. Description of the Related Art For example, pliers of the pliers type are:
It is frequently used when performing electrical work or daily carpentry, but in recent years it is also frequently used in the field of so-called wire craft and handicrafts for producing stuffed animals. In handicraft making wire craft,
Daily goods such as baskets and umbrella stands, or other decorative items are manufactured by bending wires, winding in coils, or connecting multiple wires, and use the pliers type when handling the wires. Pliers are often used. In the case of producing a stuffed animal, for example, a split pin may be used, and a pliers-type plier is also used when the split pin is worked.

As shown in FIG. 3, in a conventional pliers B of the pliers type, a pair of arms 8 are connected to each other via a connecting portion 80 so as to be rotatable relative to each other. Has a structure in which a pair of jaws 81 are formed. A pair of handle portions 82 are formed at positions near the rear ends of the pair of arms 8.

[0005]

The above-mentioned conventional pliers B
Had the following problems.

That is, in order to use the conventional pliers B to hold the desired member therebetween, it is necessary for the user to keep holding the pair of handle portions 82. Therefore, this may be a heavy burden on the user. Further, depending on the work content using the pliers B, it may be difficult to hold the pair of handle portions 82, and in the related art, such a case is particularly inconvenient. For example, when manufacturing a wire craft, the wire W may be twisted many times, for example, in the direction of arrow n1. However, the angle at which the user can rotate the pliers B at one time while holding the pair of handle portions 82 with one hand is at most about 180 °, and after twisting the wire W by 180 °, for example, the angle is further increased. In order to twist, it is necessary for the user to re-grip the pair of handle portions 82 of the pliers B and then further rotate the pliers B. However, since the rotation angle at that time is also about 180 °, it is necessary to alternately repeat the regrip of the pliers B and the rotation operation many times thereafter, and the work has been considerably troublesome.

Further, conventionally, a pair of jaws 8
In order to securely sandwich a desired member by the user 1, the user must grip the pair of handle portions 82 with a strong force, which also causes inconvenience. For example, when the tip of a split pin (not shown) is bent using the pliers B, a force for opening the pair of jaws 81 is generated as a reaction at that time. In this case, if the grip force of the user is weak, the grip force is defeated by the reaction, and the pliers B may not be able to hold the split pin properly.

[0008] Conventionally, Japanese Utility Model Laid-Open No. 63-16
There is a plier described in US Pat. This plier has a rack gear 90 provided on an arm 9A, as shown in FIG. 4 of the present application. The arm 9B is provided with a pinion gear 91 that meshes with the rack gear 90, and an operation lever 92 for preventing the rotation of the pinion gear 91. According to such a configuration, the operation lever 9
By preventing the rotation of the pinion gear 91 using the lock 2, the arms 9A and 9B can be locked, and the interval between the pair of jaws 93 can be maintained at a constant size. Therefore, according to the pliers, it is possible to eliminate the necessity of always holding the pair of handle portions 94 firmly when sandwiching a desired member. However, such a lock mechanism using the rack gear 90 and the pinion gear 91 can be applied only to a plier of a type in which one of a pair of arms slides with respect to the other. FIG.
The means shown in (1) cannot be applied to a plier having a structure that opens and closes a pair of jaws by relatively rotating a pair of arms, like a plier B shown in FIG.
The above-mentioned problem cannot be solved.

The present invention has been devised in view of such circumstances, and the pliers having a structure in which a pair of jaws are opened and closed by rotating a pair of arms relative to each other are improved in convenience compared with the prior art. Is the task.

[0010]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention employs the following technical means.

The pliers provided by the present invention are:
The first and second arms are connected via a connecting portion so as to be relatively rotatable, and a pair of the first and second arms closer to the front end and the rear end than the connecting portion has a pair of arms. A pair of pliers each having a jaw portion and a pair of handle portions, wherein the cam is attached to the first arm, and the second portion is configured to contact the cam.
The cam is in contact with the contacted portion so that the first and second arms open the pair of jaws. It is characterized in that a switching operation can be performed between a first state in which the rotation is prevented and a second state in which the contact with the contacted part is avoided.

In the present invention, the cam is moved to the first position while a desired member is sandwiched between the pair of jaws.
When the posture is set as described above, the first arm and the second arm are locked so that the pair of jaws do not open further more by the cam and the abutted portion contacting each other. Therefore, when a desired member is kept sandwiched between the pair of jaws, unlike the related art, the user does not need to keep holding the pair of handle portions with strong force. As a result, in the present invention, the burden on the user is reduced, and the usability of the pliers is improved.
For example, if you twist the wire many times,
Since the wire can be held between the pliers even if the hands are released from the pair of handle portions, the wire can be twisted by continuously rotating the pliers like a screwdriver. . Further, for example, when the tip of the split pin is bent, it is possible to prevent the pair of jaws from being opened carelessly.

On the other hand, according to the present invention, when the cam is set to the second position, the locked state of the first and second arms can be released, and the pair of jaws are moved. It can be opened and closed arbitrarily. When the cam is set to the first position in such a state, the first and second arms can be locked in the posture at that time. As a mechanism for locking the first and second arms, a mechanism for abutting the cam and the abutted portion is employed. In the present invention, the first and second arms are so-called Locking can be performed steplessly, so that the pliers can be used more easily.

In a preferred embodiment of the present invention, the first and second jaws are opened in the opening direction.
And an elastic member for urging the arm.

According to such a configuration, when the cam is in the second position in which the cam is not brought into contact with the contacted portion, if the force for grasping the pair of handle portions is relaxed, the elasticity is reduced. The pair of jaws can be easily opened using the elasticity of the member, and the operability can be improved. In addition, when the cam is set to the first posture in which the cam is brought into contact with the contacted portion, the contact state between the cam and the contacted portion is adjusted by using the force of the elastic member. Thus, the locked state of the first and second arms can be stabilized. For example, even when a desired member is not sandwiched between the pair of jaws, the first and second arms can be appropriately locked in a desired posture.

In another preferred embodiment of the present invention, the cam is provided between the handle of the first arm and the connecting portion.

According to such a configuration, since the cam is provided at a position avoiding the handle, the cam is not obstructed when the user grips the pair of handles. In addition to being able to operate the cam, the user can operate the cam without changing the grip while holding the pair of handle portions, thereby improving the operability. Further, since the cam is located closer to the rear end than the connection portion, even when the tip of the pliers is pushed into a narrow area or when a desired member is sandwiched by the pair of jaws, The cam can be kept out of the way.

[0018] In another preferred embodiment of the present invention, the cam is rotatably mounted on the first arm via a shaft around the shaft, and changes in a distance from the center of the shaft. A plate cam having an attached outer peripheral surface as a cam surface, and the abutted portion is a surface facing the rear of the second arm at a position closer to the tip of the second arm than the cam. The point of contact between this surface and the cam surface is configured to be outward in the width direction of the first and second arms from a straight line connecting the center of each of the connecting portion and the shaft.

According to this configuration, by rotating the cam, the cam surface is brought into contact with the surface of the second arm, which is the contacted portion, and the posture is separated from the posture. You can switch to Further, when the cam surface is brought into contact with the surface, it is ensured that the contact action of the cam surface causes the handle portion of the second arm to rotate in a direction away from the handle portion of the first arm. The pair of jaws can be prevented from opening. Thus, according to the above configuration, the functions intended by the present invention can be obtained with a simple structure.

[0020] In another preferred embodiment of the present invention, the cam is provided with an operation grip portion projecting outward from the first arm.

According to such a configuration, the user can easily grasp the grip portion by hand, and the cam can be easily operated using the grip portion. In addition, it is possible to prevent a problem that the gripping portion comes into contact with the second arm, for example.

Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIGS. 1 and 2 show an example of a plier according to the present invention. In FIG. 1, the pliers A of the present embodiment are configured as radio pliers type, and are characterized in that they are provided with a cam mechanism using a cam 1. The other basic configuration of the pliers A is substantially the same as the conventional pliers type pliers.

More specifically, the pliers A
Is configured to include first and second arms 3A and 3B, a spring 4, and a cam 1. The first and second arms 3A and 3B have a substantially symmetric shape, and are connected to each other via a shaft-shaped connecting portion 5 so as to be relatively rotatable. A pair of jaws 30a, 30b is formed at a portion of the first and second arms 3A, 3B closer to the distal end than the connecting portion 5, and at a portion closer to the rear end than the connecting portion 5 is. , A pair of handle portions 31a and 31b are formed. The spring 4 is, for example, a torsion coil spring, and is attached to the first and second arms 3A and 3B by its body portion being loosely fitted to the connecting portion 5. Both ends of the spring 4 are fixed to the first and second arms 3A and 3B via pins 40, for example. The spring 4
A pair of jaws 30a, 30b and a pair of handles 31a,
In the direction in which 31b opens (arrows Na and Nb directions),
An elastic force F for rotating the first and second arms 3A and 3B is exerted.

The cam 1 is a plate cam, and the first arm 3
A is attached to one side surface of A through a shaft 6 and is rotatable around the shaft 6. The cam 1 is disposed between the connecting portion 5 and the handle 31a. On the outer periphery of the cam 1, an operation grip 11 protruding outward from the first arm 3 </ b> A (a direction opposite to the direction closer to the second arm 3 </ b> B).
Are provided integrally with or separately from the cam 1. In the outer peripheral surface of the cam 1, a certain area closer to the tip of the pliers A than the grip portion 11 is a cam surface 10. The closer the cam surface 10 is to the gripper 11 to the center O of the shaft 6
This is a smooth curved surface in which the distance R from b gradually increases.

The second arm 3B is provided with a surface 32 for making contact with the cam 1. The surface 32 is a portion corresponding to an example of a contacted portion in the present invention, and is provided near the connecting portion 5. More specifically, this surface 32 is located closer to the tip of the pliers A than the cam 1 and faces the second arm 3 so as to face the cam surface 10.
It is facing the back of B. The surface 32 is connected to the connecting portion 5.
The first and second arms 3A and 3B are provided outside the width direction of the first and second arms 3A and 3B by an appropriate distance L from a straight line C connecting the center Oa of the shaft 6 and the center Ob of the shaft 6. Here, the width direction of the first and second arms 3A, 3B means the direction in which the first and second arms 3A, 3B face each other (the vertical direction in FIG. 1). Are the first and second arms 3A, 3A,
3B means a direction away from the area between the 3Bs.

Next, an example of use and operation of the pliers A having the above configuration will be described.

First, the cam 1 is provided with a pair of handle portions 31a, 31.
Since it is provided at a position avoiding b, the user can grip the pair of handle portions 31a and 31b without any trouble. Further, since the cam 1 is provided closer to the rear end of the pliers A than the connecting portion 5, even when performing an operation of inserting the tip portion of the pliers A into a narrow space, the cam 1 can be used. It can also be set up without any hindrance.

In the pliers A, when the cam surface 10 is brought into contact with the surface 32 in a state where the wire W is sandwiched between the pair of jaws 30a and 30b, as shown in FIG. Accordingly, the relative rotation operation of the first and second arms 3A and 3B is restricted. That is, the pair of handle portions 31a and 31b and the pair of jaw portions 30a and 30b
The rotation of the first and second arms 3A and 3B in the direction in which the first and second arms 3A and 3B are opened is prevented by the abutting action, and the first and second arms 3A and 3B are locked. Therefore, even if the user releases his / her hand from the pair of handle portions 31a, 31b, the wire W remains sandwiched between the pair of jaw portions 30a, 30b.

For this reason, when the wire W is twisted a number of times in the direction of arrow n2 in the figure, for example, the pliers A may be rotated in the same manner as the screwdriver is rotated. This makes the work easier. Next, when performing an operation of bending the distal end portion of the wire W into, for example, an L shape, the pliers A receive a reaction in the direction of opening the pair of jaws 30a and 30b from the wire W. However, as described above, if the first and second arms 3A and 3B are locked, a pair of jaws 30a,
30b does not open. Therefore, even if the user has a weak grip, the first and second arms 3A,
By locking the 3B, it is possible to appropriately perform the bending operation of the wire W. These effects are
This is particularly effective when the object to be bent is hard.

As shown in FIG. 2, when the grip 11 of the cam 1 is moved toward the handle 31a and the cam 1 is rotated in the direction of the arrow Nc, the contact between the cam surface 10 and the surface 32 is avoided. be able to. With this configuration, the first and second arms 3A and 3B are unlocked and can be freely rotated relative to each other, so that the same use as a normal plier can be performed. However, since the resilience F of the spring 4 acts in a direction to open the pair of jaws 30a and 30b and the pair of handles 31a and 31b, the user releases his / her hand from the pair of handles 31a and 31b. Then, the pair of handle portions 31a and 31b is greatly opened. On the other hand, if the cam 1 is operated before that to bring the cam surface 10 and the surface 32 into contact with each other, the first and second arms 3A and 3B can be locked, and the pair of handle portions can be locked. 31a and 31b can be prevented from being greatly opened. In this case, the contact state between the cam surface 10 and the surface 32 can be maintained using the elastic force F of the spring 4. A pair of handle portions 31a, 31
If locking is performed with the interval of b small, pliers A
Can be made less bulky, which is convenient for storage and storage.

In the pliers A, the center O of the shaft 6 is
The distance R from b to the cam surface 10 is varied, and the size of the gap between the cam surface 10 and the surface 32 is increased or decreased by rotating the cam 1. Therefore, as long as the cam surface 10 and the surface 32 face each other, the cam surface 10 can be appropriately brought into contact with the surface 32 by the rotation operation of the cam 1, so that the first and second cams can be brought into contact. The arms 3A and 3B can be locked steplessly. Therefore, the usability of the pliers A is further improved. Further, since the grip portion 11 of the cam 1 projects outward in the width direction of the first arm 3A, the pair of handle portions 3 is held with one hand.
While grasping 1a, 31b, it becomes easy to operate this gripping portion 11 with another one hand. Furthermore, a pair of handle portions 31a, 31b
Can be prevented from coming into contact with each other when the gripping parts 11 are brought close to each other.

The specific configuration of each part of the pliers according to the present invention is not limited to the above embodiment.

The concept of the pliers referred to in the present specification has already been described, and the pliers, radio pliers,
Regardless of the name, such as at last, a hand tool having a function of sandwiching a desired article or member is included in the concept of the pliers according to the present invention. Of course, the specific use of the pliers according to the present invention is not limited, and it does not matter whether the pliers are used for handicrafts or for electric work. Therefore, the specific shapes of the first and second arms forming the pair of jaws and handle of the pliers according to the present invention can be variously changed in design.

Further, in the present invention, the specific shape of the cam attached to the first arm and the specific configuration of the abutted portion abutting on the cam surface of this cam are also described in the above embodiment. It is not limited to one. As the cam, a cam having a different form from the plate cam of the above embodiment can be used. The contacted portion may be provided by attaching a member formed separately from the second arm to the second arm, for example.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a plier according to the present invention.

FIG. 2 is a front view showing an example when the pliers shown in FIG. 1 are operated.

FIG. 3 is a front view showing an example of a conventional pliers.

FIGS. 4A and 4B are front views showing another example of the conventional pliers.

[Explanation of symbols]

 A pliers 1 cam 3A first arm 3B second arm 4 spring 5 connecting part 6 axis 10 cam surface 11 gripping part 30a, 30b jaw part 31a, 31b handle part 32 surface (contacted part)

Claims (5)

[Claims] 1. A first and second arm are connected to each other via a connecting portion so as to be relatively rotatable, and a portion of the first and second arms closer to a front end and a rear end than the connecting portion. A plier having a pair of jaws and a pair of handles formed thereon, the pliers comprising a cam attached to the first arm and a second arm for abutting the cam. The cam is rotated in a direction in which the pair of jaws are opened when the first and second arms are brought into contact with the contacted portion. A plier characterized by being operable to switch between a first state in which the contact with the contacted portion is avoided and a second state in which contact with the contacted part is avoided. 2. The method according to claim 1, wherein the first jaw portion is opened in a direction in which the first jaw portion opens.
The pliers according to claim 1, further comprising an elastic member for urging the second arm. 3. The cam according to claim 1, wherein the cam is provided between a handle portion of the first arm and the connecting portion.
Pliers. 4. The cam is provided on the first arm so as to be rotatable around the axis via a shaft, and has an outer peripheral surface having a change in distance from the center of the shaft as a cam surface. The contact portion is a surface facing the rear of the second arm at a position closer to the tip of the second arm than the cam, and the contact portion is in contact with the cam surface. 4. The pliers according to claim 3, wherein the point is configured so as to be outward in the width direction of the first and second arms from a straight line connecting the centers of the connecting portion and the shaft. 5. 5. The operation cam according to claim 1, wherein the cam is provided with an operation grip that protrudes outward from the first arm.
A plier according to any one of claims 1 to 4.