JP2011230233A - Pliers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide pliers which can automatically open jaw parts.SOLUTION: The pliers include a pair of handles 1A and 1B having the upper and lower jaw parts 2A and 2B, a bolt 7, and a nut 8. The pliers have the pair of handles 1A and 1B rotatably journaled using the bolt 7 and the nut 8. A spring 9 is attached to the outer periphery of the bolt 7 for journaling the handles 1A and 1B, and the respective jaw parts 2A and 2B of the pair of handles 1A and 1B are opened using a resilient urging force of the spring 9 attached to the outer periphery. Thus, since an unnecessary increase in the number of components is prevented, the cost of the priers themselves becomes low, and assembly workability is extremely improved. Furthermore, since a limitation is not imposed on a storage space for the spring 9, permanent set in fatigue, which is caused by long-term use, can also be effectively prevented by virtue of the use of the relative large spring.

Description

  The present invention relates to various pliers such as water pump pliers and combination pliers, for example.

  Of the various pliers, the conventional water pump pliers are not specifically shown, but a pair of handles having upper and lower jaws at the tip, and bolts and nuts that rotatably support the pair of handles, A ring-shaped spring that elastically biases the other handle having the lower jaw in the opening direction to open the upper and lower jaws, and a latch that removably engages with an engagement tooth of a guide slot that will be described later An insertion hole having a claw and having a toothed guide toothed hole having a serrated shape at the neck of one handle having an upper jaw, while inserting the tip of the bolt into a corresponding portion of the neck of the other handle A mounting groove for mounting the ring-shaped spring is formed on the outer periphery of the insertion hole on a concentric circle, and a through-hole for fitting both ends of the spring is formed in a part of the mounting groove. Composition (E.g., see Patent Document 1).

  When assembling, the both ends of the spring are fitted into the through holes of the other handle, and the spring is mounted in the mounting groove, while the locking claw is installed in the guide long hole of the one handle. Insert the tip of the bolt through the insertion hole of the other handle, which has the lower jaw, from the insertion hole of the other jaw while facing the inside, and insert the long end of the spring fitted in the through hole into the engagement claw. The water pump pliers are assembled by tightening the bolt tip protruding from the guide slot of the one handle having the upper jaw with a nut.

  Further, in such an assembled state, the other handle having the lower jaw is elastically biased in the opening direction by the elastic biasing force of the spring, and the lower jaw and the upper jaw of the pair of handles are separated. Since the mouth will open, after that, if you move the locking claw in the guide slot and adjust the distance between the upper and lower jaws and grab the tap tap screw or pipe screw etc., it will be tightened easily Or it can relax.

Japanese Utility Model Publication No. 39-1391

  Therefore, under the conventional water pump pliers, by using a spring, the upper and lower jaws can be automatically opened, so that there is an advantage that the workability is good, but on the other hand, In addition to the bolts and nuts that support the handle, springs and locking claws are required, which naturally increases the number of parts and increases the cost. There was a dislike to be serious.

  In addition, since the storage space of the spring itself is limited, the spring that can be used is naturally reduced, and not only a sufficient elastic urging force can be obtained, but also there is a sufficient risk of lethality. In addition, for the other handle, an insertion hole, a mounting groove or a through hole is provided, and in a type using a locking claw, an engagement tooth of a guide long hole is provided for one handle. Since it has to be processed into a dedicated sawtooth shape, in any case, the processing becomes difficult and the cost increases.

  The present invention was developed in order to effectively solve the problems of the conventional pliers, and the invention according to claim 1 includes a pair of handles having upper and lower jaws and bolts and nuts. In the pliers that pivotally support a pair of handles with the bolts and nuts, a spring is mounted on the outer periphery of the bolt that supports the handle, and the elastic biasing force of the spring mounted on the outer periphery is attached. The jaws of the pair of handles are opened.

  According to a second aspect of the present invention, on the premise of the first aspect, the spring is a torsion coil spring.

  According to a third aspect of the invention, on the premise of the second aspect, one end of the torsion coil spring is fixed to the bolt side, and the other end is slidably locked to one handle side. Features.

  Therefore, in the invention described in claim 1, since the springs that open the jaws of the pair of handles are only mounted on the outer periphery of the bolt, the number of parts can be increased. As a result, the cost of the pliers itself is reduced, and the assembly workability is easily increased. In addition, since the storage space for the spring is not limited, a relatively large spring can be used, so that settling due to long-term use can be effectively prevented.

  In the invention described in claim 2, since the torsion coil spring is used as the spring, the mouth opening of each jaw can be reliably ensured, and the existing torsion coil spring can be used, so that the cost is also reduced. It will be cheap.

  In the invention of claim 3, since one end of the torsion coil spring is fixed to the bolt side and the other end is slidably locked to one handle side, workability is improved. Needless to say, the processing is simplified, and the cost is reduced from this point.

It is a disassembled perspective view which shows the pliers which concern on the Example of this invention. It is a perspective view which shows a torsion coil spring. It is a perspective view which shows the state which mounted | worn with the torsion coil spring around the outer periphery of the volt | bolt. It is a perspective view which shows the state which assembled the pliers. It is a principal part side view which shows the assembled pliers.

  The present invention comprises a pair of handles having upper and lower jaws and bolts and nuts, and the bolts and nuts are provided on the premise of a pliers that rotatably support the pair of handles. A spring is attached to the outer periphery, and the jaws of the pair of handles are opened by the elastic urging force of the spring attached to the outer periphery, thereby reducing the number of parts and the structure of the pliers itself. This is intended to simplify the process.

  Hereinafter, the present invention will be described in detail with reference to a preferred embodiment shown in the drawings. The embodiment according to the present invention has been developed for water pump pliers, and as shown in FIG. A pair of handles 1A and 1B having 2B, a bolt 7 and a nut 8 for pivotally supporting the pair of handles 1A and 1B, and a torsion coil spring 9 as a spring, and having an upper jaw portion 2A A guide long hole 4 for loosely fitting a bolt 7 is formed in the neck 3A of one handle 1A, and a wavy engagement tooth 5 is formed on one side edge of the guide long hole 4, while the other having a lower jaw 2B. An insertion hole 6 for inserting the tip of the bolt 7 is formed in a corresponding portion of the neck portion 3B of the handle 1B.

  Therefore, under this embodiment, if the tip of the bolt 7 is inserted into the insertion hole 6 of the other handle 1B through the guide long hole 4 of one handle 1A and tightened with the nut 8, this results in a pair of handles. Since 1A and 1B are rotatably supported, after that, the bolt 7 is moved in a predetermined direction in the guide long hole 4 and locked with the engaging tooth 5 at that position as in the conventional case. If a state is acquired and the distance between both jaw parts 2A and 2B is adjusted, it becomes possible to easily tighten or relax the tap screw or the like of the water supply.

  The water pump pliers according to the present embodiment, on the premise of such a configuration, bend one end portion 9a of the torsion coil spring 9 as the spring inward as shown in FIG. The one end portion 9a is configured to be fitted into the fixing hole 10 formed in the shaft portion of the bolt 7, and the other end portion 9b is bent outward, and the bent other end portion 9b is connected to one handle 1A. The upper jaw portion 2A and the handle 1A are slidably locked to the side surface of the neck portion 3A.

  Therefore, in the present embodiment, when the pliers are assembled, as shown in FIG. 3, the bent one end portion 9 a of the torsion coil spring 9 is inserted into the fixing hole 10 formed in the shaft portion of the bolt 7. To obtain a state in which the torsion coil spring 9 is attached to the outer periphery of the bolt 7, and the other end 9b of the bent portion is hooked on the neck 3A of one handle 1A while the tip of the bolt 7 is If the guide long hole 4 of the handle 1A is inserted into the insertion hole 6 of the other handle 1B and tightened with the nut 8, the pliers themselves can be assembled very easily as shown in FIG.

  In such an assembled state, as shown in FIG. 5, unlike the prior art, the torsion coil spring 9 is mounted on the outer periphery of the shaft portion of the bolt 7. The spring 9 does not get in the way of use, but in no way harms the function of the water pump pliers themselves. Therefore, a simplified pliers having a structure having the same function as the conventional one can be provided.

  In addition, although the said Example is intended for water pump pliers, this invention is not limited to this, Unless it is contrary to the mind of this invention, it can apply also to other various pliers. Needless to say.

  Since the pliers according to the present invention have a very simple structure and can easily obtain automatic jaw opening, if this is applied to various pliers such as a water pump pliers and combination pliers, it will be very advantageous.

DESCRIPTION OF SYMBOLS 1A One handle 1B The other handle 2A Upper jaw part 2B Lower jaw part 3A Neck part 3B Neck part 4 Guide long hole 5 Engagement tooth 6 Insertion hole 7 Bolt 8 Nut 9 Torsion coil spring (spring)
9a One end of torsion coil spring 9b Other end of torsion coil spring 10 Fixing hole

Claims (3)

  A pair of handles having upper and lower jaws and bolts and nuts, and a pliers that rotatably supports the pair of handles with the bolts and nuts, a spring is mounted around the outer periphery of the bolts that support the handles. The pliers are characterized in that the jaws of the pair of handles are opened by the elastic biasing force of a spring mounted on the outer periphery.   2. The pliers according to claim 1, wherein the spring is a torsion coil spring.   3. The pliers according to claim 2, wherein one end of the torsion coil spring is fixed to the bolt side, and the other end is slidably locked to one handle side.

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