JPH0685760U - wrench - Google Patents

Abstract

(57) [Abstract] [Purpose] A pipe wrench having a tightening strip 1 in which a plurality of links 2 to 5 are swingably connected to each other, and a lever 9 connected to one end of this link via a pivot pin 10. In the case of loosening the pipe P screw-connected, even if the lever 9 swings largely in the D direction due to the release of the fastening force, the claw portion 11 of the lever 9 and the free end portion side of the tightening strip 1 The engagement state with the engagement pin 14 is prevented from being disengaged. [Structure] When the claw portion 11 of the lever 9 and the engaging pin 14 of the tightening strip 1 are engaged, the head 10 of the pivot pin 10 is engaged.
The connecting member 20 is attached to both the a and the head 14a of the engagement pin 14 so as to maintain the mutual distance therebetween.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wrench used for rotating or stopping rotation of pipes, rods, piles, nuts and the like.

[0002]

[Prior art]

 Conventionally, as this type of large wrench used for steel pipe piles, concrete piles, etc., a plurality of links are swingably connected to each other via connecting pins, and A pipe wrench having a lever connected to one end of a strip via a pivot pin is known. The lever is provided with a claw portion that is engageable with and disengageable from the free end portion (where the engaging pin is provided) of the tightening strip on the tip side of the pivot pin position. Therefore, with this wrench, the tightening strip is wound around the steel pipe pile, and the free end of the wrench is engaged with the lever claws before operating the lever or fixing the lever. By rotating the piles etc., the steel pipe piles etc. are screwed together and loosened in the opposite direction.

[0003]

[Problems to be solved by the device]

 The conventional wrench has the following drawbacks, for example, when it is used to release the connection between the steel pipe piles screwed together. At the beginning of applying force to the lever, strong fastening forces act on each other, so it is necessary to apply a considerably large operating force.However, once the steel pipe piles loosen and start to rotate, the mutual operation of the steel pipe piles will start. With the sudden release of the fastening force, the operating force acting on the lever may be surplus and the lever may be swung greatly. When the lever is swung, the lever may cause the lever claw to come off the free end of the tightening strip.If this happens, the wrench itself may be large and heavy, resulting in a very dangerous situation. Is clear.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a claw portion of a lever and a free end portion of a tightening strip even when the lever bounces. The purpose of the present invention is to provide a wrench that can be used safely by preventing the engagement state of the wrench from being disengaged.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention takes the following technical means. That is, according to the present invention, a plurality of links are swingably connected to each other via connecting pins, and a fastening pin is connected to one end of the fastening strip via a pivot pin to determine the pivot pin position. When the lever having the free end of the tightening strip and the claw that can be engaged and disengaged on the tip side of the lever and the free end of the tightening strip and the claw of the lever are engaged with each other, the free end is It is characterized in that it comprises a connecting member attached between the engaging portion and the pivot pin so as to maintain the mutual distance between them.

Further, in the present invention, an engaging pin used for engaging with a claw portion of a lever is provided at a free end portion of the tightening strip, and the engaging pin and the pivot pin are at least One end of each of them projects laterally from the side surface of the tightening strip, and the connecting member is rotatable around at least the projection of either the engaging pin or the pivot pin. It is characterized in that it is connected and held in a state, and can be engaged with and disengaged from the other protruding portion by a hook portion.

It is preferable that a handle is provided on the connecting member.

[0008]

[Action]

 According to the present invention, when the free end portion of the tightening strip and the claw portion of the lever are engaged with each other, the connecting member extends over the engaging portion of the free end portion and the pivot pin holding the lever. Since the lever is attached, even if the lever swings largely, the above-mentioned engaged state is not disengaged.

If the connecting member is connected and held to the lever or the tightening strip, it is not necessary to carry the connecting member separately when carrying or handling the wrench as a whole. If the connecting member is provided with a handle, there will be no trouble in holding the connecting member or the lever in various handling.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 6 show a first embodiment of a wrench according to the present invention, in which 1 is a tightening thread, and four arc-shaped links 2, 3, 4, 5 are connected to each other by a connecting pin 6, It is swingably connected via 7 and 8 so that it can be freely formed into an annular shape or a linear shape as a whole. Reference numeral 9 denotes a lever, which is swingably connected to the end of the link 2 on one end side of the tightening strip 1 via a pivot pin 10. The lever 9 is formed such that the tip end side of the position where the pivot pin 10 is penetrated is bent slightly toward the side opposite to the extending direction of the link 2, and the projecting end of this bent part is formed. The side is a claw 11 having a semi-cylindrical recess 11a. The claw portion 11 is engageable with and disengageable from an engagement pin 14 provided at the end portion of the free end side link 5 of the tightening strip 1. Reference numeral 20 denotes a connecting member, which is attached to both of the claw portions 11 of the lever 9 and the engaging pins 14 of the tightening strip 1 so as to maintain the engaged state. In this embodiment, the connecting member 20 is connected and held to the free end side link 5 (engagement pin 14) of the tightening strip 1. The connecting member 20 has a main body portion 21 having a U-shaped cross section with a back plate 21a and both side plates 21b and 21c, and a handle 24 is attached to the back plate 21a.

As shown in FIG. 4, a bifurcated projecting piece 18 is provided at the end of the free end side link 5 in the tightening strip 1, and the above-mentioned engagement is made such that these projecting pieces 18 extend over each other. The pin 14 is penetrated. The engaging pin 14 has a disk-shaped head portion 14a which is locked to one side surface of the link 5 and projects, and a collar 17 is fitted to the pin tip end side projecting to the other side surface of the link 5. It is fixed by the split pin 16. The portion 14b where the engaging pin 14 is exposed between the protruding pieces 18 is used for engaging with the claw portion 11 of the lever 9 described above. The collar 17 is formed with a cylindrical portion 17a between the side surface of the link 5 (lower side in FIG. 4) and the insertion position of the split pin 16 into which a long hole portion 22 of a connecting member 20 described later is fitted. As described above, it has a predetermined thickness.

As shown in FIG. 5, a bifurcated connecting portion 12 is provided at an end portion of the one-end side link 2 in the tightening strip 1, and a lever 9 is fitted into the connecting portion 12 so that these three The pivot pin 10 described above is penetrated so as to extend over the person. The pivot pin 10 has a disk-shaped head 10a that is locked to one side surface of the link 2 and projects. A collar 19 is fitted to the pin tip end side of the link 2 that projects to the other side surface. It is fixed with the split pin 16. The collar 19 has a cylindrical portion 19a formed between the side surface of the link 5 (lower side in FIG. 5) and the insertion position of the split pin 16 to which a hook portion 23 of a connecting member 20 described later is fitted. In addition, it has a predetermined thickness.

In the tightening article 1, the connecting structure of the links 2 to 5 has a bifurcated connecting portion 12 provided at one end of each link, as shown in FIG. 6 showing a connecting portion between the links 2 and 3. And the connecting pieces 13 provided at the other ends of the links and fitted in the connecting portion 12, respectively, are fitted to each other, and the headed connecting pins 6 to 8 are pierced through them, and the pin protrusions The collar 15 is fitted on the end side, and the collar 15 is fixed to the pin projecting end by the split pin 16.

As shown in FIG. 1 and FIG. 3, in the connecting member 20, the side plates 21b and 21c of the connecting member 20 are provided near the one end, to the head portion 14a of the engaging pin 14 and the cylindrical portion 17a of the collar 17. An elongated hole portion 22 is formed so that it can be fitted with a slight margin, and the head portion 10a of the pivot pin 10 and the cylindrical portion 19a of the collar 19 are engaged with and separated from the other end with a slight margin. The hook portion 23 is formed so that it can be freely moved. The hook portion 23 is formed so that the engaging opening 23a is directed to the edge of the side plates 21b, 21c opposite to the back plate 21a, and the head of the pivot pin 10 is fitted to the engaging opening 23a. With the portion 10a and the cylindrical portion 19a of the collar 19 fitted, a crank-like long opening shape is formed so that the connecting member 20 as a whole can be moved to the free end side link 5 side of the tightening strip 1. To have. Further, the elongated hole portion 22 has its longitudinal direction oriented in a direction that allows the movement of the connecting member 20 at this time with respect to the free end side link 5 (direction slightly oblique to the longitudinal direction of the crank of the hook portion 23). Is formed in this way.

Locking claws 25, 26, 27 are attached to the inner surfaces of the links 3 to 5 of the tightening strip 1 respectively. These locking claws 25 to 27 are provided so as to be able to move in and out by bolts 28, 29, 30 and are adapted to various steel pipe piles P or the like having different outer diameters by adjusting the degree of each moving in and out. Can be made. Next, the usage of the wrench of the present invention constructed as described above will be described. Now, as shown in FIG. 2, there is a steel pipe pile P that is vertically connected by screwing. Among them, the lower steel pipe pile P is screwed with the upper steel pipe pile P being prevented from rotating by an appropriate method. It is assumed that they are rotated in the loosening direction (direction D in FIG. 1) to unfasten them. First, the tightening strip 1 is wound around the lower steel pipe pile P so that the locking claws 25 to 27 come into contact with the outer peripheral surface of the steel pipe pile P or the like, and the engaging pin 14 of the free end side link 5 is engaged. The claw portion 11 of the lever 9 is engaged with. Next, holding the grip 24 of the connecting member 20, the hook portions 23 are hooked on the head portion 10 a of the pivot pin 10 and the cylindrical portion 19 a of the collar 19. Further, preferably, while holding the grip 24, the lever 9 of FIG. 1 is pushed while applying a force so as to press the connecting member 20 toward the free end side link 5 (it is not always necessary to do so). Operate in the D direction. As a result, even if the fastening between the steel pipe piles P is loosened and the lever 9 may be swung in the D direction at a stretch due to the excessive operating force, the connecting member 20 causes the pivot pin 20 and the engaging pin 14 to move. Are held at a mutual distance from each other, so that the engagement between the claw portion 11 of the lever 9 and the engagement pin 14 of the tightening strip 1 is not disengaged by the momentum. After the fastening of the steel pipe piles P is loosened, the hook portion 23 is pulled toward the protruding direction of the lever 9 by the handle 24 so that the hook portion 23 is moved to the head 10a of the pivot pin 10 and the cylinder of the collar 19. Then, the claw portion 11 of the lever 9 is disengaged from the engaging pin 14 of the tightening strip 1.

Unlike the above case, when the upper steel pipe pile P is rotated in the loosening direction of the screw while the lower steel pipe pile P is stopped, the wrench is used. After turning the whole body upside down as shown in Fig. 1, perform the operation in the same manner as described above (the operation direction of the wrench is opposite to the D direction). FIG. 7 is an exploded perspective view showing a connecting member 20 used in the second embodiment of the present invention. The difference from the first embodiment is that the head 10a of the pivot pin 10 and the cylindrical portion 19a of the collar 19 are different. The hook 23 that is hooked to is not a crank shape but is formed as a notch that is partially opened, and the portion that is fitted into the head portion 14a of the engaging pin 14 and the cylindrical portion 17a of the collar 17 is a long hole portion. It is not a point 22 but a round hole 31. In the second embodiment, in order to prevent each hook portion 23 from coming off from the head portion 10a of the pivot pin 10 and the cylindrical portion 19a of the collar 19, due to the bounce when the lever 9 swings largely. , The both side plates 21b, 21c are provided with projecting pieces 32 having through holes 32a at the projecting ends, and the inner side of the claw portion 11 of the lever 9 (the outer peripheral surface of the steel pipe pile P or the like is provided over the both projecting pieces 32. The safety pin 33 can be inserted so as to be placed in Since the structure of the wrench itself and the usage condition thereof as a whole are substantially the same as those of the first embodiment, detailed description thereof is omitted here.

FIG. 8 is an exploded perspective view showing a connecting member 20 used in a third embodiment of the present invention, the main body 21 of which is a strip-shaped plate, and the tip end side of which is a pivot pin. The hook portion 23 has a round hole 23b that fits into the head portion 10a of the ten. Further, the engaging pin 14 used in the third embodiment has its head portion 14a formed as a flat hinge piece, and the forked base portion 21d provided on the main body portion 21 of the connecting member 20 is fitted therein. The hinge shaft 35 is attached so as to be swingable. The configuration of the lens itself (excluding the engaging pin 14) and the usage status thereof as a whole are substantially the same as those in the first embodiment, and therefore detailed description thereof is omitted here.

FIG. 9 is a perspective view showing a connecting member 20 used in the fourth embodiment of the present invention, in which the main body portion 21 has a plate shape and is fitted to the head portion 10 a of the pivot pin 10. Round holes 31 that fit into the openings 23c and the head 14a of the engagement pin 14 are formed at predetermined intervals. A handle 24 is attached to the main body 21. Since the structure of the wrench itself and the usage status thereof as a whole are substantially the same as those of the first embodiment, a detailed description thereof will be omitted.

In the first to third embodiments and the like, the connecting member 20 is configured to be connected and held to the free end side link 5 (engagement pin 14) of the tightening strip 1. It is also possible to connect and hold to the pivot pin 10 connecting the lever 2 and the lever 9. Further, in the fourth embodiment and the like, the connecting member 20 may be connected to the lever 9 or the tightening strip 1 by an appropriate string member (not shown) such as a chain so as to prevent the loss thereof.

[0020]

[Effect of device]

 The present invention has the above-mentioned structure, and in the state where the claw portion of the lever is engaged with the free end portion (engagement pin) of the tightening strip, the connecting member is attached to both of them to attach them to each other. Since the space between the levers is maintained, even if the fastening of steel pipe piles is loosened by the operation of the wrench, and the lever may shake at a dash due to excess operating force, it will not be The engagement state with the free end (engagement pin) of the tightening strip will not be disengaged. Therefore, safety in use is achieved.

When the connecting member is connected and held to the lever or the tightening strip by using the engaging pin, the pivot pin, or the like, the connecting member can be prevented from being lost, and the wrench can be carried or handled as a whole. It will be easier. Providing a handle on the connecting member facilitates attachment and detachment of the connecting member, and also allows the handle to be attached to the lever when operating the lever, which provides stability.

[Brief description of drawings]

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

FIG. 2 is a side view of FIG.

FIG. 3 is a perspective view showing a main part of FIG. 1 for easy understanding.

FIG. 4 is an enlarged sectional view taken along line AA of FIG.

5 is an enlarged sectional view taken along line BB of FIG.

6 is an enlarged cross-sectional view taken along the line CC of FIG.

FIG. 7 is an enlarged perspective view showing an exploded state of a connecting member used in the second embodiment.

FIG. 8 is an enlarged perspective view showing the connecting member used in the third embodiment in an exploded manner.

FIG. 9 is an enlarged perspective view showing a connecting member used in a fourth embodiment.

[Explanation of symbols]

 1 Tightening Articles 2-5 Links 6-8 Connection Pins 9 Lever 10 Pivot Pins 11 Claws 14 Engagement Pins 20 Connecting Members 23 Hooks 24 Handles

Claims (3)

[Scope of utility model registration request] 1. A tightening strip in which a plurality of links are swingably connected to each other via a connecting pin, and one end of the tightening strip is connected via a pivot pin to a tip end of the pivot pin position. When the lever having the free end of the tightening strip and the claw that can be engaged and disengaged on the side and the free end of the tightening strip and the claw of the lever are engaged with each other, the engagement at the free end A wrench, characterized in that it comprises a connecting member mounted between the portion and the pivot pin so as to maintain a mutual distance therebetween. 2. An engaging pin used for engaging with a claw portion of a lever is provided at a free end portion of the tightening strip, and the engaging pin and the pivot pin have at least one end portion thereof. Projecting laterally from the side surface of the tightening strip, the connecting member is connected to and held by at least the projection of one of the engagement pin and the pivot pin in a rotatable state at least around it. The wrench according to claim 1, wherein the other protruding portion is detachable by a hook portion. 3. The wrench according to claim 1, wherein the connecting member is provided with a handle.