JP3127170U - Tool for cutting and connecting chains - Google Patents

Abstract

[PROBLEMS] To simplify work procedures and improve durability and safety.
A push screw 12 to be screwed onto a first protrusion 11a of a main body block 11, a push rod 14 having a small diameter portion 14a and a large diameter portion 14b, and a guide block 15 Is provided between the first and second protrusions 11a and 11b.
[Selection] Figure 7

Description

  The present invention relates to a tool for cutting and connecting a chain used when, for example, replacing a worn chain with a new one for a motorcycle chain or the like.

  When a motorcycle chain or the like is worn out, it must be replaced with a new chain. The work procedure at this time is to disconnect the chain from the sprocket by pulling out any one pin of the worn chain. Attach the replacement chain to the end of the chain, and connect both ends of the new chain through joint links to connect them endlessly. In general, the chain C is constructed by flexibly connecting a large number of roller links C3, C3... Via pins Ca, Ca... And link plates Cb, Cb. In the new chain C, the pins C2 and C2 of the joint link C1 are inserted into the pin holes at the ends of the roller links C3 and C3 at both ends, the joint plate C4 is press-fitted into the ends of the pins C2 and C2, and the pins C2 and C2 are inserted. Connect by caulking the tip. However, each pin C2 has seal rings C5 and C5 mounted on both outer sides of the roller link C3, but there is a type in which the seal rings C5 and C5 are not mounted.

  Thus, a cutting and connecting tool used for chain replacement work has been proposed (Patent Document 1).

This includes a substantially U-shaped first and second main body that are combined to face each other, a push screw that penetrates the bottom wall of the first main body, and a pin removing pin and plate that are individually attached to the tip of the push screw. A holder, a caulking pin, and a chain holder fixed in the second body are provided. Cutting the chain by setting the chain on the chain holder, combining the second body with the first body, and selecting and installing any of the pin removal pin, plate holder, and caulking pin at the tip of the push screw The operations of press-fitting the joint plate and caulking the pin can be executed sequentially.
JP-A-8-229756

  According to such a conventional technique, the chain must be separated from the first and second main bodies and set on the chain holder in the second main body, and the first and second main bodies must be combined together. Therefore, there is a problem that the whole operation is complicated and the work efficiency is not good because the pin removal pin, the plate holder, and the caulking pin must be individually attached to the tip of the push screw. Further, since the pin removing pin has to be thinner and longer than the pin of the chain, it may be bent or broken, making it unusable, and there is a problem that durability and safety are not sufficient.

  Therefore, in view of the problems of the prior art, the object of the present invention is to support the guide block for forming the first and second protrusions on the integrated main body block and guiding the small diameter portion of the push rod through the guide block. An object of the present invention is to provide a tool for cutting and connecting a chain that can simplify work procedures and improve work efficiency by providing a metal fitting, and can easily realize sufficient durability and safety.

  In order to achieve such an object, the configuration of the present invention is such that a main body block having first and second projecting portions opposed to each other and a screw hole penetrating the first projecting portion are attached to advance and retract toward the second projecting portion. A push screw having a smaller diameter than the chain pin, a push bar having a larger diameter larger diameter portion, and a support fitting attached to the main body block. The second protrusion passes through the chain pin. A possible through hole is formed so as to face the push screw, and the push screw is formed with a stepped hole on the shaft center that opens at the tip of the second protrusion side, and the push rod has a small diameter portion and a large diameter portion. It is possible to insert the guide block through which the small-diameter portion is slidable and hold it between the first and second protrusions. To do.

  The support bracket can be replaced with a holder block that holds the joint plate of the chain instead of the guide block, and the support bracket is elastically biased toward the first protrusion, It can be positioned via a set bolt.

  In addition, a spacer block for positioning the joint link of the chain may be detachably mounted on the front surface of the second protrusion through the through hole, and a detachable grip handle is attached to the main body block. You may attach in the direction opposite to the protrusion direction of a part.

  In the configuration of the device, the push rod has the small-diameter portion and the large-diameter portion reversed, that is, either the small-diameter portion or the large-diameter portion is directed to the second protrusion, Can be inserted into the hole. Therefore, when the small diameter portion of the push rod is directed to the second protrusion, the chain is set on the front surface of the second protrusion and the push screw is advanced, the pin of the chain is pushed out through the small diameter portion of the push rod, and extracted. The chain can be cut (unpinned). Note that the pin pushed out of the chain passes through the through hole of the second protrusion and is discharged to the outside. At this time, the small-diameter portion of the push rod passes through the guide block on the support metal slidably between the first and second protrusions and is guided through the guide block. There is no risk of bending or breaking.

  On the other hand, when the large diameter portion of the push rod is directed to the second protrusion, a chain temporarily connected at both ends via a joint link is set on the front surface of the second protrusion, and the push screw is advanced, By pressing the joint plate, the joint plate can be pressed into the pins of the joint link (plate press-fitting). Further, the chain connection can be completed by pressing the tip surface of the large diameter portion against the tip of each pin of the joint link and caulking the tip of the pin (pin caulking). However, a caulking die is formed on the tip surface of the large diameter portion in order to caulk the tip of the pin correctly.

  By replacing and mounting the holder block instead of the guide block, the support metal fitting can be set at an appropriate position by holding the joint plate on the holder block when the plate is press-fitted. The push screw at this time pushes the holder block through the large diameter portion of the push rod, and presses the joint plate on the holder block into the pin of the joint link.

  When the chain is set on the front surface of the second protrusion when unpinning, the support metal fitting biased toward the first protrusion pushes the guide block toward the second protrusion with fingers, and the guide block and the second protrusion The chain can be easily set at an appropriate position by sandwiching the chain with the part and tightening the set bolt to position the support bracket. The same applies to the press-fitting of the plate. Further, the support metal fitting moves together with the holder block toward the second protrusion by pressing the holder block via a set screw when the plate is press-fitted, and the joint plate on the holder block is moved to the front surface of the second protrusion. It can be pressed into the chain and pressed into the pin of the joint link.

  The spacer block to be mounted on the front surface of the second protrusion is designed to position the joint link of the chain at an appropriate position during plate press-fitting and pin caulking. The second protrusion is prevented from being damaged. The spacer block is positioned so that the joint link is movable in the length direction of the chain, and is removed when the pin is removed.

  The grip handle attached to the main body block must be gripped with one hand when rotating the push screw, and easily generate the necessary and sufficient rotational torque with the other hand holding the spanner or wrench that drives the push screw. Can do. Moreover, since the grip handle is detachable, it can be conveniently stored by removing it when not in use.

  Hereinafter, embodiments of the invention will be described with reference to the drawings.

  The chain cutting and connecting tool includes a main body block 11 having first and second projecting portions 11a and 11b facing each other, a push screw 12 screwed into the first projecting portion 11a, and a support metal fitting 20 attached to the main body block 11. As a main member (FIGS. 1 and 2). Note that the chain cutting and connecting tool is used for cutting and connecting the chain C in FIG.

  The first and second projecting portions 11a and 11b are projected from both end portions of the side end surface in one long side direction of the substantially rectangular parallelepiped main body block 11. A round bar-shaped grip 13 is attached to the main body block 11 so as to be detachable in a direction opposite to the first protrusion 11a, and a low protrusion 11c opposite to the second protrusion 11b is provided. However, the grip handle 13 is fixed by screwing a male screw 13a on the grip handle 13 side into a screw hole 11d on the main body block 11 side.

  The push screw 12 is screwed into a screw hole 11e penetrating the first protrusion 11a, and can be advanced and retracted toward the second protrusion 11b. The set screw 12 has a hexagonal head 12a, and a stepped hole 12b that opens at the tip on the second protrusion 11b side is formed on the shaft 12c.

  A through hole 11f is formed in the second protrusion 11b. The through hole 11f is formed on an extension line of the axis 12c of the push screw 12 so as to face the push screw 12.

  The support fitting 20 is configured by standing support rods 22 and 22 at both ends of a base block 21 that crosses the main body block 11 in the thickness direction. An O-ring 22a is housed and attached to the upper end of each support rod 22 in a narrow groove. A tip end portion of a set bolt 23 that passes through the bolt hole 11 g of the projecting portion 11 c of the main body block 11 is screwed into the base block 21. A compression spring 23 a is attached to the set bolt 23 between the protrusion 11 c and the base block 21. Therefore, the support fitting 20 is elastically biased toward the first protrusion 11a via the compression spring 23a, and between the first and second protrusions 11a and 11b via the set bolt 23. Can be positioned.

  3 is attached to the chain cutting and connecting tool, the guide block 15 in FIG. 4, the holder block 16 in FIG. 5, and the spacer block 17 in FIG.

  The push bar 14 has a small diameter portion 14a having a smaller diameter than the pins Ca and C2 of the chain C and a large diameter portion 14b having a large diameter (FIG. 3A). The small-diameter portion 14a is longer than the large-diameter portion 14b, and the tip of the large-diameter portion 14b is formed with a caulking die for the pin C2 that combines the frustoconical protrusion 14c and the surrounding ring 14d (same as above). Figures (A) and (B)). That is, the push rod 14 can fix the joint plate C4 by correctly caulking the tip of the pin C2 by pressing the tip of the large diameter portion 14b against the tip of the pin C2. However, a shallow round hole C2a is formed at the tip of the pin C2 to allow the protrusion 14c to enter and expand (FIG. 3B, FIG. 14).

  In addition, the stepped hole 12b of the push screw 12 fits the large diameter portion 14b and the small diameter portion 14a of the push rod 14 (FIG. 2). That is, the large diameter portion of the stepped hole 12b can accommodate almost the entire length of the large diameter portion 14b, and the small diameter portion can accommodate the entire length of the small diameter portion 14a. Therefore, the push rod 14 has the small-diameter portion 14a and the large-diameter portion 14b reversed, that is, only the large-diameter portion 14b is accommodated in the large-diameter portion of the stepped hole 12b, and the entire length of the small-diameter portion 14a is the second protrusion. By projecting to the side of 11b or by reversing the direction, both the full length of the small diameter portion 14a and the substantially full length of the large diameter portion 14b can be accommodated in the stepped hole 12b and inserted into the stepped hole 12b.

  The guide block 15 has notches 15a and 15a formed on both ends of one surface of the rectangular parallelepiped block (FIGS. 4A and 4B), and through holes 15b and 15b are provided in parallel with the notches 15a and 15a. A stepped hole 15c perpendicular to the through holes 15b and 15b is formed between the notches 15a and 15a. However, the stepped hole 15c has an intermediate minimum diameter portion that matches the small diameter portion 14a of the push rod 14, and a maximum diameter portion that opens in the opposite direction to the notches 15a and 15a is sufficiently larger than the large diameter portion 14b of the push rod 14. It has a large diameter. Further, the intermediate diameter portion of the stepped hole 15c opened between the notches 15a and 15a can accommodate the caulked portion at one end of an arbitrary pin Ca of the chain C, and the through holes 15b and 15b are provided as support metal fittings. It is assumed that 20 support rods 22 and 22 are fitted.

  Therefore, the guide block 15 is held between the first and second protrusions 11a and 11b via the support fitting 20 by inserting the support rods 22 and 22 of the support fitting 20 into the through holes 15b and 15b. Can do. The O-ring 22a at the tip of each support rod 22 lightly prevents the guide block 15 on the support rods 22 and 22 from being pulled out.

  The holder block 16 is formed such that a pair of long-side stepped ridges 16a and 16a are opposed to one surface of a substantially rectangular parallelepiped block (FIGS. 5A and 5B). , 16a and 16b are formed, and a shallow round hole 16c is formed in the center of the back surface on the opposite side of the protrusions 16a and 16a. However, the joint plate C4 of the chain C can be held in the gap a on the tip side of the ridges 16a, 16a, and the caulking portion of the tip of the pin C2 is provided in the gap b on the base side of the ridges 16a, 16a. It can be stored movably to the left and right. Further, the through holes 16 b and 16 b are adapted to the support rods 22 and 22 of the support fitting 20, and the round hole 16 c is adapted to the large diameter portion 14 b of the push rod 14. Therefore, the holder block 16 is replaced and attached to the support fitting 20 instead of the guide block 15 by inserting the support rods 22 and 22 of the support fitting 20 into the through holes 16b and 16b, and the first and second protrusions 11a. , 11b.

  The spacer block 17 has a groove 17a in the long side direction formed on one side of a flat block body (FIGS. 6A and 6B), and a short mounting cylinder 17b is erected at the center of the other surface. Yes. An O-ring 17c is housed and mounted in the narrow groove at the tip of the cylinder 17b. The concave groove 17a can accommodate the caulking portions of the pins C2 and C2 of the joint link C1 so as to be movable to the left and right, and the cylinder 17b with the O-ring 17c is adapted to the through hole 11f of the second protrusion 11b. Yes. Therefore, the spacer block 17 can be detachably mounted on the front surface of the second protrusion 11b by inserting the column 17b into the through hole 11f, and the O-ring 17c lightly prevents the spacer block 17 from coming off.

  The method of using such a tool for cutting and connecting a chain is as follows.

  First, to remove the pin and cut the chain C, the push rod 14 is inserted so that the entire length of the small diameter portion 14a protrudes toward the second protrusion 11b with respect to the stepped hole 12b of the push screw 12. The guide block 15 is attached to the support rods 22 and 22 of the support metal fitting 20 (FIGS. 7 and 8). At this time, the small diameter portion 14a is inserted from the maximum diameter portion side of the stepped hole 15c of the guide block 15, and the minimum diameter portion is slidably penetrated. Subsequently, the chain C is sandwiched between the second protrusion 11b and the guide block 15 via the support fitting 20, and is set on the front surface of the second protrusion 11b. When positioning is made in correspondence with the through hole 11f of the protrusion 11b and the push screw 12 is rotated and advanced toward the second protrusion 11b, the pin Ca is pushed out by the small diameter portion 14a of the push rod 14 and is extracted. The chain C can be cut by discharging to the outside through 11f.

  However, the small diameter portion 14a of the push rod 14 is guided through the minimum diameter portion of the stepped hole 15c of the guide block 15 until the pin Ca is completely extracted, and the large diameter portion 14b In the final stage, it is possible to partially enter the maximum diameter portion of the stepped hole 15c. Further, when the chain C is set on the front surface of the second protrusion 11b, the support fitting 20 applies a force in the direction in which the compression spring 23a is pushed and contracted with fingers (in the direction of arrow K in FIG. 9), the base block 21, the guide block When both 15 are moved so as to slide along different side end surfaces of the main body block 11, the chain C can be sandwiched between the guide block 15 and the second protrusion 11b. Accordingly, when the chain C is correctly set by lightly tightening the set bolt 23, the head 12a of the push screw 12 is rotated with a spanner or a wrench, and the push screw 12 and the push rod 14 are moved to the second protrusion 11b. Just move forward.

  At the time of plate press-fitting, the push rod 14 is inserted into the stepped hole 12b of the push screw 12 with the large diameter portion 14b facing the second protrusion 11b (FIGS. 10 and 11), and the support rod of the support fitting 20 The holder block 16 is mounted on the front and rear surfaces 22 and 22, and the spacer block 17 is mounted on the front surface of the second protrusion 11b. On the other hand, both ends of the chain C are temporarily connected via the joint link C1, and the joint link C1 is set on the front surface of the second protrusion 11b via the spacer block 17. Further, the joint plate C4 is held by the holder block 16. At this time, the joint link C1 and the joint plate C4 are set correctly in the center of the spacer block 17 and the holder block 16, respectively, and the tips of the pins C2 and C2 of the joint link C1 correspond to the pin holes of the joint plate C4. Then, the set bolt 23 is lightly tightened to prevent the joint plate C4 from being displaced or dropped through the holder block 16.

  Subsequently, when the push screw 12 is rotated to advance the push rod 14, the holder block 16 is pressed through the large diameter portion 14b of the push rod 14, and the joint plate C4 can be press-fitted into the pins C2 and C2. Yes (FIG. 11). However, the holder block 16 presses and compresses the compression spring 23a via the support rods 22 and 22 and the base block 21 of the support fitting 20 while sliding on the side end surface of the main body block 11 when the joint plate C4 is press-fitted. Thus, it moves to the 2nd protrusion 11b side.

  Subsequently, to fix the pin, the support bracket 20 is removed from the main body block 11 (FIGS. 12 and 13), and the ends of the pins C2 and C2 of the joint link C1 into which the joint plate C4 is press-fitted are pushed. What is necessary is just to caulk sequentially through the type | mold of the front end surface of the diameter part 14b. That is, the joint link C1 on the front surface of the spacer block 17 is moved in the length direction of the chain C so that the pins C2 and C2 correspond to the large diameter portion 14b protruding from the tip of the push screw 12 in order, and the push screw 12 is rotationally driven. The tip of each pin C2 is caulked (FIG. 3B).

  Note that the present invention can be applied to the chain C without the seal ring and the joint link C1 as it is, regardless of FIGS.

Perspective view of main part Side view of main parts Main part structure explanatory drawing (1) Main part structure explanatory drawing (2) Main part structure explanatory drawing (3) Main part structure explanatory drawing (4) Usage side view (1) Usage front view (1) Usage perspective view Usage side view (2) Usage front view (2) Usage side view (3) Usage front view (3) Exploded perspective view of the main part of the chain

Explanation of symbols

C ... Chain Ca, C2 ... Pin C1 ... Joint link C4 ... Joint plate 11 ... Body block 11a ... First projection 11b ... Second projection 11e ... Screw hole 11f ... Through hole 12 ... Push screw 12b ... Stepped hole 12c ... Axis center 13 ... Grip handle 14 ... Push bar 14a ... Small diameter part 14b ... Large diameter part 15 ... Guide block 16 ... Holder block 17 ... Spacer block 20 ... Support bracket 23 ... Set bolt

Utility model registration applicant Enuma Chain Manufacturing Co., Ltd.
Attorney Tadaaki Matsuda, Attorney

Claims (5)

  A main body block having first and second projecting portions opposed to each other, a push screw that is attached to a screw hole penetrating the first projecting portion and is advanced and retracted toward the second projecting portion, and a smaller diameter than a pin of the chain A push rod having a small-diameter portion and a large-diameter large-diameter portion and a support fitting attached to the main body block are provided, and the second protrusion has a through-hole through which a pin of a chain can pass as the push screw. The push screw is formed with a stepped hole on the shaft center that opens at the tip of the second protrusion side, and the push rod has the small diameter portion and the large diameter portion reversed. The support fitting can be inserted into the stepped hole, and the support fitting is mounted between the first and second protrusions by attaching a guide block that slidably penetrates the small diameter portion. Tool for cutting and connecting chains.   2. The chain cutting / connecting tool according to claim 1, wherein a holder block for holding a joint plate of the chain is exchanged and attached to the support fitting instead of the guide block.   3. The chain cutting and connecting tool according to claim 1, wherein the support fitting is elastically biased toward the first protrusion and is positioned via a set bolt. 4.   The chain according to any one of claims 1 to 3, wherein a spacer block for positioning a joint link of the chain is detachably mounted on the front surface of the second protrusion through the through hole. Disconnection tool.   The chain cutting / connecting tool according to any one of claims 1 to 4, wherein a detachable grip handle is attached to the main body block in a direction opposite to a protruding direction of the first protrusion. .

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