JPH0751253Y2 - Pipe wrench - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to improvement of a pipe wrench.

<Prior Art> Conventionally, as a pipe wrench for gripping the outer periphery of the pipe from both sides to rotate the pipe, one shown in FIG. 4 is known.

This is provided with a pipe holding part b for holding the pipe outer periphery on the tip side of a long wrench body a, and an operation part c for rotating the wrench body a on the rear end side, and a pipe holding part b. Insertion part e into which the pipe U is formed and the pipe p is inserted
Is formed, and two pipe locking portions d, d each having a plurality of toothed portions d1 ... d1 having sharpened tips are provided on both sides of the lower end of the insertion portion e so as to face each other. Then, by operating the adjusting screw part f provided on the upper part to adjust the interval between the pipe locking parts d, d, the pipe locking parts d, d are brought into contact with the outer periphery of the pipe p to set, and then the operation part By pressing c downwardly and rotating the wrench body a, both pipe locking portions d, d hold the outer periphery of the pipe p to rotate the pipe p.

However, when the pipe p has its outer peripheral surface subjected to a film treatment such as a polyethylene film or a surface treatment such as painting or plating, the plurality of teeth having sharpened tips so as to easily bite the outer periphery of the pipe. When the pipe locking portions d, d composed of the portions d1 ... d1 are brought into contact with the outer circumference of the pipe and held between them, the surface treatment is peeled off, and there is a problem that it is difficult to use for the pipe subjected to the surface treatment. Also, to insert the pipe p into the insertion part e and hold it between the two pipe locking parts d, d,
Since the adjusting screw portion has to be rotated, it takes time to hold it, and the operation is troublesome. Further, the adjustment screw portion must be provided, and there is a problem that the structure is complicated and the manufacturing cost is high.

On the other hand, for example, Japanese Utility Model Application Laid-Open No. Sho 142-142895 and Japanese Patent Laid-Open No. Sho 49-1259.
In Japanese Patent Laid-Open No. 99, a pipe locking portion is formed in a curved shape so that the pipe is not easily scratched.
Specifically, the two curved pipe locking parts are rotatably attached to the wrench body, and the interval between the pipe locking parts can be adjusted by operating the operation part and the adjusting screw part. Even different pipes can be held between the pipe locking parts.

However, in these things, it is possible to prevent the pipe from being scratched easily, but when holding the pipe like the previous one, you have to operate the screw of the operation part and the adjustment screw part, There is a problem that it takes time to hold it, the operation is troublesome, and the structure is complicated and the manufacturing cost is high.

<Problems to be solved by the invention> The present invention has been proposed in view of the above-mentioned circumstances, and it is difficult for the pipe to be scratched, and the pipe can be used even when used for various pipes having different diameters. It is an object of the present invention to provide a pipe wrench that can be easily held and manufactured at low cost.

<Means for Solving the Problems> The present invention solves the above problems by providing a pipe wrench having the following features.

The pipe wrench of the present invention is a long wrench body 1
A pipe holding portion 2 for holding the outer circumference of the pipe is provided on the front end side of the and the operation portion 3 for rotating the wrench body 1 is provided on the rear end side. The pipe gripping portion 2 is provided with two pipe locking portions 11 and 20 facing each other at a front portion and a rear portion of the pipe holding portion 2 with a predetermined gap therebetween, and thus the two pipe locking portions 11 and 20 are provided. A pipe insertion portion 4 into which a pipe can be inserted from below is formed between the two.

The pipe locking portion 20 on one side includes a locking member 21 and an elongated slanted groove 6 formed in the wrench body 1.

Since one end of the locking member 21 is provided with a contact surface 21a having a curved shape, one end side of the locking member 21 can come into contact with the outer peripheral surface of the pipe. The other end of the locking member 21 is slidably and rotatably attached to the inclined groove 6.

One end of the inclined groove 6 in the longitudinal direction is extended from the other end to the other side of the pipe engaging portion 11 side and to the upper side,
The locking member 21 can move in the vertical direction while approaching / retreating the pipe locking portion 11 on the other side.

<Operation> In the present invention, the contact surface 21 that can be in contact with the outer peripheral surface of the pipe
A locking member 21 having a is rotatably and slidably attached to the elongated slant groove 6, and the other side of the pipe locking portion 11
It is possible to move up and down while approaching and retreating.

By doing so, for example, as shown in FIG. 1, the pipe P is inserted into the pipe insertion portion 4 formed between the two pipe locking portions 11 and 20.
In the case of inserting the pipe P, the locking member 21 attached to the slant groove 6 slides downward of the slant groove 6 by its own weight, and the interval of the pipe insertion portion 4 is widened. It can be easily inserted regardless of. After inserting the pipe P into the pipe insertion portion 4, as shown in FIG. 1, the locking member 21 is slid to the upper side of the inclined groove 6 so that the abutment surface 21a of the locking member 21 is fixed to the pipe P. When the operating portion 3 is pressed downward (in the X direction in the drawing) by contacting the outer periphery of the locking member 21, the locking member 21 tries to move upward along the inclined groove 6 due to the pressing force. Since the entire abutting surface 21a of the pipe abuts on the outer periphery of the pipe P from the rear side of the pipe locking portion 11 on the tip side, the upward movement is blocked, while the abutting face 21a is provided with the outer periphery of the pipe P. A pressing force that presses in the radial direction is applied, and the locking member
The outer periphery of the pipe P can be held between the pipe 21 and the pipe locking portion 11 to rotate the pipe P. At this time, if the pipe P is inserted into the pipe insertion portion 4 so that the other side pipe locking portion 11 and the outer circumference of the pipe P are brought into contact with each other, the diameter of the pipe P becomes small as shown in FIG. The position of the center O2 ... O4 of each pipe P is displaced toward the upper left side in the figure as the distance increases. However, in the present invention, the longitudinal direction of the inclined groove 6 is obliquely aligned vertically. The locking member 21 can be slid substantially in the direction in which the centers O2 ... O4 of the pipes P are displaced. Accordingly, the locking member 21 can be always held in contact with the pipe P from the rear side of the other side of the pipe locking portion 11 regardless of the diameter of the pipe P and held.

Further, in the production, it is not necessary to provide an adjusting screw portion as in the conventional case, the structure can be simplified, and the production can be performed at low cost.

<Embodiment> An embodiment of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the present invention.

The pipe wrench of the present invention is a long wrench body 1
Is provided with a pipe holding portion 2 for holding the outer periphery of the pipe P, and a rear end side with an operation portion 3 for rotating the wrench body 1.

The pipe holding portion 2 is formed integrally with the wrench body 1 in a curved shape, and a pipe insertion portion 4 into which the pipe P can be inserted is formed inside thereof. The pipe holding portion 2 has pipe locking portions 11 and 20 at the lower portions of the front end side and the rear end side, respectively.
Is provided.

The distal end side pipe locking portion 11 is provided integrally with the wrench body 1 so as to project into the pipe insertion portion 4. or,
The tip portion 11a of the pipe locking portion 11 is formed in an R shape with a small radius so that it can be in point contact with the outer periphery of the pipe P as much as possible, and when the slip occurs, the outer periphery of the pipe P is not scratched as much as possible. There is. In addition, this pipe locking portion 11 is
The pipe P is not limited to be in contact with one location on the outer periphery, and a plurality of R-shaped tip portions 11a may be provided.

The pipe locking portion 20 on the rear end side includes an inclined groove 6 formed in the wrench body 1 and a locking member 21 that is separate from the wrench body 1. The locking member 21 is attached such that its rear end side is slidable and rotatable in the longitudinal direction of the inclined groove 6 of the wrench body 1. Specifically, as shown in FIG. 2, the locking member 21
In addition to providing a fitting insertion groove 21b into which the wrench body 1 is fitted to increase the area of the contact surface, a shaft pin fitting hole 21c into which the shaft pin 5 is fitted is provided, and as shown in FIG. As described above, the shaft pin 5 is passed through the shaft pin fitting insertion hole 21c together with the sliding member 7 that fits and slides in the inclined groove 6 of the wrench body 1 so that the locking member 21 is tilted. It is attached to the groove 6 so as to be movable and rotatable. Also, in this embodiment,
The inclination of the inclined groove 6 of the wrench body 1 is such that, from the lower end to the upper end, various pipes P having different diameters are inserted into the pipe insertion portion 4, and the outer periphery of each pipe P is in contact with the contact portion P1 with which the pipe locking portion 11 abuts. When the pipe is inserted so as to pass through two points, that is, a point P2 above the contact portion P1, it is inclined diagonally to the upper left side in the same direction as the inclination of the line q3 connecting the centers O2 ... O4 of the respective pipes P. This allows
It is arranged along the outer circumference of various pipes P having different diameters. Then, the front surface of the locking member 21 is provided with a contact surface 21a.

A method of using the pipe wrench thus configured will be described. First, when the pipe P is inserted into the pipe insertion portion 4 formed between the two pipe locking portions 11 and 20, the locking member 21 attached to the inclined groove 6 itself moves below the inclined groove 6 by its own weight. It slides and the interval between the pipe insertion parts 4 is widened, and the pipe P can be easily inserted regardless of the diameter. From that state, as shown in FIG. 1, the locking member 21 is slid to the upper side of the inclined groove 6 so that the contact surface 21a of the locking member 21 is brought into contact with the outer periphery of the pipe P, and the operating portion 3 is operated. Is pressed downward (X direction in the drawing), the locking member 21 tries to move upward along the inclined groove 6 due to the pressing force,
The entire abutment surface 21a of the locking member 21 is the pipe locking portion 11 on the tip side.
Since the pipe P is in contact with the outer periphery of the pipe P from the rear side, the upward movement is prevented, while the contact face 21a receives a pressing force that radially presses the outer periphery of the pipe P, and the locking member 21 The pipe P can be rotated by holding the outer periphery of the pipe P with the pipe locking portion 11. Therefore, the pipe P can be held by only the operation of moving the locking member 21 upward along the inclined groove 6 without rotating the operation portion or the adjusting screw portion as in the conventional case. It can be easy. Further, at that time, when the pipe P is inserted into the pipe insertion portion 4 so that the pipe locking portion 11 on the other side and the outer circumference of the pipe P are brought into contact with each other, the diameter of the pipe P as shown in FIG. The smaller the position, the more the positions of the centers O2 ... O4 of the pipes P are displaced toward the upper left side in the figure. Therefore, the locking member 21 can be slid substantially in alignment with the direction in which the centers O2 ... O4 of the pipes P are displaced. As a result, regardless of the diameter of the pipe P, the locking member 21 can be always held in contact with the pipe P from the rear side of the pipe locking portion 11 on the other side and held. Therefore, the pipe P can be reliably turned regardless of the diameter of the pipe P.

Further, in the production, it is not necessary to provide an adjusting screw portion as in the conventional case, and the production can be simplified and produced at a low cost.

The above-mentioned locking member 21 may be provided in the pipe locking portion 11, and the outer circumference of the pipe P may be held by the contact surfaces 21a of the two locking members 21. Can be used more effectively.

With the above structure, the number of parts can be reduced as compared with the conventional one, and the manufacturing cost can be reduced and the manufacturing can be facilitated.

The materials, shapes, and the like of the locking member 21 and the pipe locking portion 11 are not limited to those shown in this embodiment, and can be changed as appropriate.

<Effect> As described above in the embodiments, according to the present invention, the pipe can be held only by the operation of sliding the locking member along the inclined groove regardless of the diameter of the pipe. It can be easy to operate. Moreover, regardless of the diameter of the pipe, the locking member can be always held in contact with the pipe from the rear side of the pipe locking portion on the other side, and can be reliably rotated.

Further, in the production, it is not necessary to provide an adjusting screw portion as in the conventional case, and the production can be simplified and produced at a low cost.

As described above, the present invention can provide a useful and practical pipe wrench that can easily and surely turn a pipe without scratching the outer circumference of the pipe.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a perspective view of a locking member, and FIG. 3 is III-I in FIG.
A sectional view taken along line II and FIG. 4 are side views showing a conventional example. 1 ... Wrench body, 2 ... Pipe holding part, 3 ... Operating part, 4 ... Pipe insertion part, 5 ... Shaft pin, 11 ... Pipe locking part, 21 ... Locking member, 21a ... Abutment surface, P ... Pipe.

Claims (1)

[Scope of utility model registration request] 1. A long wrench body (1) is provided with a pipe holding portion (2) for holding the pipe outer periphery on the tip side, and an operating portion for rotating the wrench body (1) on the rear end side. 3), and two pipe locking portions (11) in which the pipe holding portions (2) face each of the front portion and the rear portion that are separated by a predetermined distance.
By providing the (20), the pipe insertion part (4) into which the pipe can be inserted from below is formed between the two pipe locking parts (11) and (20), and the pipe locking part on one side ( 20) comprises a locking member (21) and an elongated slanted groove (6) formed in the wrench body (1), and one end of the locking member (21) has a curved shape. Contact surface (21
By providing a), one end side of the locking member (21) can come into contact with the outer peripheral surface of the pipe, and the locking member (2
The other end of 1) is slidably and rotatably attached to the slant groove (6), and one end of the slant groove (6) in the longitudinal direction is connected to the other end of the pipe locking portion (11). ) Side and the upper side so that the locking member (21) is provided on the other side of the pipe locking portion (11).
A pipe wrench characterized in that it can move up and down while approaching and retreating.