JPS5940632Y2 - squeezer for lock ring - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lock ring wringer that reduces the diameter of a circumferentially divided lock ring used in a pipe joint or the like during joint joining work or the like.

In joints for cast iron pipes, a circumferentially split lock ring is used to prevent the socket and socket from coming apart from each other.

It is necessary to reduce the diameter of the lock ring in order to insert it into the socket when joining the joint, and a wringer is used to reduce the diameter.

Figure 4 shows a conventional wringer, where 41 is a tube body, 42
is a lock ring, and 43 is a wringer.

The lock ring 42 is formed into a wide piece in the circumferential direction, and coupling members 45 and 46 that engage with each other via an engagement piece 44 are attached to both ends.

The coupling members 45 and 46 are engaged after the lock ring 42 is contracted in diameter at a predetermined position, and then held in the contracted state.

Diameter reduction holes 47 are provided on the side surfaces of both ends of the lock ring 42 .

The wringer 43 includes a pair of support members 48a and 48b having pins that engage with the holes 47 of the lock ring 42, and a pipe-shaped kite member 49a that slidably fits into each other.
The support members 48a and 48b are connected to each other so as to be movable near and far, and the support members 48a and 48b are moved by a turn baffle 50.

The kite members 49a, 49b are curved with approximately the same curvature as the lock ring 42 for ease of operation.

However, since the kite members 49a and 49b are curved in this way, the manufacturing cost increases, and the lock ring 42
The kite members 49a and 49b are easily deformed when narrowing down the lock ring 42, which causes the problem that the engagement pin may come off from the hole 47 of the lock ring 42.

Therefore, the service life is short.

In addition, since the operation is performed using the thin turn baffle 50, there is a drawback that it cannot be used for expanding the diameter of a lock ring that can be tightened.

The present invention aims to solve the above problems.

In order to achieve this purpose, the present invention has a fixed member fixed to one end of the screw shaft, and a sliding member fitted externally to the other end.
Engagement pins that engage with holes on both end sides of the split lock ring are provided, and a part of the nut screwed onto the other end of the screw shaft is internally fitted into the slide member, and the slide member at this fitting portion is inserted into the slide member. Alternatively, a circumferential annular groove is formed on one of the nuts, and a protrusion in the diametrical direction of the screw shaft is formed on the other side to fit into the annular groove.

Therefore, since the slide member can be moved along the screw shaft, the tank bottom is simpler than the conventional turnbuckle type, and there is no problem of deformation, which eliminates the problem of the engagement pin coming off. Moreover, it can have a long life.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

1 is a screw shaft, a fixing member 2 is fixed to one end by a parallel pin 3, and a slide member 4 is fixed to the other end by a screw shaft insertion hole 1.
1, it is slidably fitted onto the outside.

A support plate 5 is provided on the fixed member 2 and the slide member 4 so as to project slightly inwardly from each other, and an insertion member 6 is fixed to the tip of the support plate 5 in a cantilevered manner.

Two support plates 5 of each of the fixed member 2 and the slide member 4 are provided in parallel.

The insertion member 6 is inserted between the receiver lower and the insertion port 8 of the pipe joint, extends in a direction perpendicular to the screw shaft 1, and has an engagement pin 9 at its tip that engages with the hole 47 of the lock ring 42. is installed protrudingly.

A nut 10 is screwed into the threaded portion 1a of the screw shaft 1.

The nut 10 has a flange 10a at the center in the axial direction, the negative side part thereof is a cylindrical part 10b, and the other side part is a polygonal part 10a.
It is formed in c.

The cylindrical portion 10b of the oak 10 is fitted into a large diameter portion provided in the screw shaft insertion hole 11 of the slide member 4 so as to be relatively rotatable.

An annular groove 12 is formed on the outer surface of the cylindrical portion 10b, and two set bolts 13, which serve as protrusions that fit into the annular groove 12, are screwed onto the slide member 4 from the outer surface.

The set bolt 13 has a hexagonal hole in its head.

The two set bolts 13 are arranged on both sides of the screw shaft 1 in the diametrical direction.

Note that the slide member 4 may be provided with an annular groove, and the nut 10 may be provided with a protrusion that fits into the annular groove.

Next, the effect will be explained.

For narrowing down, first, the engagement pins 9 of the fixed member 2 and the engagement pins 9 of the slide member 4 are inserted into the holes 47 at both ends of the lock ring 42.

Then, the nut 10 is rotated using a ratchet wrench or the like.

The nut 10 is rotatable with respect to the slide member 4 and is engaged with the set bolt 13. Therefore, the rotation of the nut 10 causes the slide member 4 to move toward the fixed member 2 while being guided by the screw shaft 1. Approach, lock ring 42
are narrowed down.

In this way, since the slide member 4 is moved along the screw shaft 1, the conventional guide members 49a and 49b are
The structure is simpler than that using a turn baffle 50, and since the straight screw shaft 1 is used, there is no problem of deformation of the screw shaft 1, and there is no problem of the engagement pin 9 coming off.

Therefore, it has a long service life.

Furthermore, if the support plates 5 of the fixed member 2 and the slide member 4 are tilted inward (jl) from each other as in this embodiment, the support plates 5 are deformed in the upright direction due to the elasticity of the lock ring 42 that acts during narrowing. Therefore, the engagement pin 9 is prevented from coming off more reliably than in the case where the support plate 5 is provided vertically in advance.

Furthermore, since the structure is simple, a thick screw shaft 1 can be used, and by rotating the nut 10 in the opposite direction, it is also possible to expand the diameter of the lock ring, which is capable of contracting.

As explained above, according to the present invention, the structure is simple, there is no problem of deformation, there is no problem of the engagement pin coming off, the life is long, and the aperture can also be used to expand the diameter of the lock ring. equipment can be provided.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being a partially cutaway front view, Figure 2 being a side view, and Figure 3 being in use.
FIG. 4 is a diagram showing the usage state of a conventional wringer. 1...Screw shaft, 2...Fixing member, 3.
...Parallel pin, 4...Slide member, 6
...Insert member, 9...Engagement pin, 10
...Nut, 10a...Inner cylinder part, 11
...screw shaft insertion hole, 12 ... annular groove,
13... Set bolt, 41... Tube, 42... Lock ring, 47... Hole.

Claims (1)

[Scope of utility model registration request] A fixing member fixed to one end of the screw shaft and a sliding member externally fitted to the other end are provided with engaging pins that engage with holes on both end sides of the split lock ring. A part of the nut screwed into the nut is internally fitted into the slide member, and a circumferential annular groove is formed in either the slide member or the nut at this fitting part, and the other is fitted into the annular groove. A wringer for lock rings characterized by forming a protrusion in the diametrical direction of the screw shaft.