JPS6128691Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a chain type wrench used for tightening not only bolts and nuts but also cylindrical bodies such as pipes.

Conventionally, this type of chain type wrench has been used as a wrench for tightening pipes, etc., and the representative ones are Utility Model No. 1758, 1973, and Utility Model No. 1758, 1972.
No. 12387, Japanese Utility Model Application No. 57-43975, etc. exist, but all of these wrenches use a roller chain or a leaf chain made of a general gourd-shaped link plate as a chain to be wrapped around a pipe or the like. Then, one end is fixed to the handle, and the pipe is tightened by wrapping it tightly around a pipe, etc., hooking the other end to the handle via the pin of the roller chain mentioned above, and turning the handle. However, in order to fit the other end of the roller chain with the handle, a long pin is made to protrude on both sides, a groove is provided in the handle, and a groove is provided at one end of the handle to prevent it from slipping with the pipe. Many have serrations to prevent slipping.

There is also a link plate in which a large number of small irregularities are provided on the outer circumferential surface of the gourd-shaped link plate to prevent slipping between the pipes.

(Utility Model Application No. 58-8573) In other words, as is clear from the conventional examples, the key points of the chain type wrench are the prevention of slippage between the chain and the pipe and the connection method with the handle.
Since the contact surface pressure is not so high in the stand-shaped link and slipping will inevitably occur, some kind of countermeasure as mentioned above must be taken, and the above connection should also use pins that protrude on both sides of the chain. is the most common and is used in most cases.

Although the chain type wrench according to the present invention is a chain, it uses a special silent type chain for the purpose of preventing slippage between pipes, and also takes into consideration connection with the handle and storage of the chain. be.

That is, it is a type of portable pipe wrench in which the silent chain is stored in the casing when not in use and pulled out when in use. Hereinafter, one embodiment of the pipe wrench according to the present invention will be described in detail based on the drawings.

The pipe wrench is composed of a casing A1, a casing B2 and a silent chain 3,
The casing A1 and the casing B2 have a U-shaped cross section, and the casing B2 opens and closes around the shaft 4, and is fitted into the casing A1.

Further, the casing A1 has a curved long hole 6, while the casing B2 has a straight long hole 7 in the longitudinal direction.
A shaft 8 is passed through both elongated holes 6 and 7, and buttons 5 and 5 are fixed to both ends of the shaft 8.

Therefore, by moving the button 5 along the elongated hole 6, the casing B2 opens and closes around the shaft 4. Further, two fixing pins 9 and 10 are fixed to the end of the casing A1 at a substantially right angle to the longitudinal direction, and are spaced apart from each other by a certain distance, approximately parallel to the longitudinal direction, a little further from the fixing pins 9 and 10. Long hole A
11 and the long hole B12, and the pin A1 has a button A15 and a button B16 fixed to both ends thereof, respectively.
3 and pin B14 are inserted.

The silent chain 3 is placed inside the fixing pins 9 and 10 in the casing A1 and casing B2 configured in this way, and the pins A13 and
and passes through both sides of pin B14, and both ends 18, 19
is attached to the connecting plate 17, and one point 2 of the connecting plate 17
A chain 21 is connected from 0, and a ring 22 is attached to the other end to prevent the other end of the chain 21 from entering into the casing A1.

By the way, to explain the procedure for using the pipe wrench below, if the button 5 is moved to open the casing B2, the clamp on the silent type chain 3 is released and it can freely slide inside the casing A1. Therefore, after wrapping the silent type chain 3 around the pipe 23, pull the chain 21 to eliminate the looseness of the silent type chain 3, and then move the button 5 again to close the casing B2.
Close.

FIG. 1 shows a state in which the casing B2 is open, so that the silent chain 3 can freely slide within the casing A1, and FIG. 2 shows a state in which the casing B2 is closed.

That is, when the casing B2 is closed, the silent type chains 3 are moved to one side, and as shown in FIG.
is sandwiched between the outer wall 28 of casing A1 and the end surface 24 of casing B2, and pin A13 and pin B
14 fits into a recess 27 between the legs 26, 26 of the link plate 25 of the silent chain 3.

Also, the pin A13 engages with the Y row and the pin B14 engages with the X row, thereby clamping the silent chain 3. In this state, if force is applied to the handle consisting of the casing A1 and the casing B2 to rotate it, the silent chain 3 will be able to rotate the pipe 23 without damaging the outer surface of the pipe 23.

The term "silent chain" as used herein is not limited to silent chains generally used for power transmission, but refers to a chain constructed using link plates similar to link plates of a silent chain.

As described above, the pipe wrench according to the present invention has a casing A1 and a casing B2 that can be opened and closed.
A silent type chain is housed inside, and when the casing B2 is opened and closed, the pins A13 and B14 passing through the elongated holes A11 and B12 are engaged with the link plate 25 and recess 27 of the silent type chain 3. The pipe wrench is used to clamp or release the silent chain 3, and as described above, the pipe wrench is prepared for operation when the pipe 23
The pipe wrench is used to clamp or release the silent type chain 3, and as described above, preparation for operation of the pipe wrench is completed by simply wrapping the silent type chain 3 around the pipe 23 and then pulling the chain 21 to close the casing B2. , it's pretty simple.

Furthermore, the silent type chain 3, which is one of the greatest features of the present invention, uses a link plate 25 with both legs 26, 26 protruding, and the shape of the link plate 25 not only has a clamping function with the casing A1. , the contact surface pressure can be increased compared to the conventional gourd-shaped link plate, and no slipping occurs between the handle and the pipe 23 when turning the handle.

In addition, the shape of the link plate 25 not only increases the contact surface pressure, but also the protruding legs 26 have flexibility as a whole of the link plate 25, and easily adapt to the pipe 23 due to the action of tension, increasing the friction between the two. It can be forced.

Further, the silent chain chain 3 is stored in the casing A1 after use, making it a convenient pipe wrench to carry.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the pipe wrench according to the present invention, and FIG. 2 shows a state in which the casing B is closed and the silent chain is clamped. 1...Casing A, 2...Casing B, 3
...Silent type chain, 4 ... shafts.

Claims (1)

[Scope of utility model registration request] A casing B2 is pivotally supported on a shaft 4 provided at one end of the casing A1 so as to be freely openable and closable, and two fixing pins 9 and 10 are mounted on the other end in a direction substantially perpendicular to the longitudinal direction of the casing A1. Two elongated holes A11 and B12 are bored almost in parallel, and pins A13 and B14 with button A15 and button B16 attached to both ends are inserted into the elongated holes A11 and B12, respectively, and the pins A13 and B14 are inserted into the elongated holes A11 and B12. The silent type chain 3 is inserted between the fixing pins 9 and 10 in A1, passes through both sides of pin A13 and pin B14, and both ends of the silent type chain 3 are fixed with the connecting plate 17, and the above casing A1 The shaft 8 is inserted through the curved long hole 6 of the casing B2 and the long hole 7 in the longitudinal direction of the casing B2, and the button 5 fixed to the shaft 8 is moved to engage the recess 27 of the link plate 25 of the silent chain 3. A chain type pipe wrench characterized in that pin A13 and pin B14 can be engaged.