JPS593820Y2 - Lock ring work tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power tool for expanding the diameter of a lock ring, which is used in a pipe joint and has a split portion at one location in the circumferential direction.

In a pipe joint, a socket is inserted into the socket, a sealing material is interposed between the inside surface of the socket and the outside surface of the socket, and the diameter is reduced so that it can be secured to an annular groove or protrusion provided on the inside surface of the socket. A detachment method that prevents separation between socket sockets by providing a split lock ring with force and fitting the single split lock ring into an annular groove on the outer surface of the socket or engaging with a protrusion. Anti-protection fittings are known from the prior art.

In order to connect and disassemble this type of pipe joint, it is necessary to expand the diameter of the lock ring against the diameter reduction biasing force, but this work is difficult because the working space is extremely narrow.

The purpose of the present invention is to provide a power tool that can easily expand the diameter of the lock ring by engaging the divided end faces of the lock ring and separating them from each other. I will explain based on this.

First, an example of the above-mentioned pipe joint will be described with reference to FIGS. 4 and 5. Reference numeral 11 denotes a socket into which a socket 12 is inserted.

13 is a sealing material bearing surface 14 formed on the inner surface of the socket and the socket 1
This is a sealing material consisting of a rubber ring interposed between the two outer surfaces.

An annular protrusion 15 is protruded from the inner surface of the socket, located on the back side of the socket from the sealing material seat surface 14, and a large-diameter cylinder between this projection 15 and the step surface 16 at the back end of the socket. A lock ring receiving space is formed by the shaped inner surface 17.

An annular groove 18 is provided on the outer surface of the tip of the insertion port 12, and a lock ring 19 having a split portion at one location in the circumferential direction is fitted therein by its diameter reducing force.

This lock ring 19 can be engaged with the protrusion 15 from the back side of the socket in the tube axis direction, and its engagement prevents the socket 12 from coming off from the socket 11.

As shown in FIG. 5, the lock ring 19 has an engagement recess 21 for a power tool for expanding the lock ring in its opposing divided end faces 20a and 20b.

A working tool according to the present invention for expanding the diameter of the lock ring 19 in the above-mentioned pipe joint will be explained with reference to FIGS. 1 and 2.

The working tool 1 includes a pair of arm rods 2 a and 2 b whose one ends are in contact with each other and each of which has an engaging protrusion 3 protruding from a side surface opposite to the side surface of the one end that is in contact with each other; In order to guide the arm rods so that they can come into contact with and separate from each other, each arm rod 2a, 2
A guide shaft 5 passing through a boss 4 fixed to the other end of b, a bolt 6 rotatably supported at an intermediate portion of one of the pair of arm rods 2a, and a bolt 6 fixed to the other arm rod 2b. It consists of a nut 7 into which the bolt 6 is screwed.

The bolt 6 is rotatably supported by a support hole 9 of a support boss 8 fixed on one arm rod 2a, and the support boss 8 is supported by a bolt head 6a and a collar 10 fixed to the bolt shaft. The clamping prevents movement in the axial direction.

Note that one end of the pair of arm rods 2 a and 2 b is bent appropriately so that the bolt 6 is located at a location where it can be easily operated even when the one end is positioned at the position of the lock ring 19 to be operated. be done.

In the illustrated example, the bolt 6 and the guide shaft 5 are bent into an L-shape from a straight line portion to one end, and are configured to be arranged and operated as shown by the imaginary line in FIG. 4.

According to the above configuration, the arm rods 2a, 2b (7
) After inserting one end and positioning the engagement protrusion 3 in the engagement recess 21 facing each other, when the bolt 6 is rotated using a suitable tool such as a ratchet wrench or a spanner, the pair of arm rods 2a, 2
b move away from each other, and as a result, after the engagement protrusion 3 fits into and engages the engagement recess 21, the split end surface 20 of the lock ring 19
a and 20 b are separated, and the lock ring 19
expands in diameter against the biasing force for diameter reduction, and can be removed from the annular groove 18.

Figures 3a and 3b show modified examples of the retaining portion formed at one end of each arm rod 2a, 2b with the split end face of the lock ring, and a is the first
In contrast to the pyramid-shaped engaging protrusion 3 of the embodiment shown in FIGS. and 2, a pin-shaped engaging protrusion 11 is provided, and
1 is constructed of a mere abutting and securing surface 12 without providing an engaging protrusion.

According to the lock ring working tool of the present invention, as is clear from the above description, the lock ring can be locked simply by inserting the engaging portion at one end between the split end faces of the lock ring whose diameter is to be expanded and rotating the bolt. The diameter of the ring can be expanded easily and reliably.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and the first figure is a plan view and the second figure is a plan view.
The figure is a front view, Figures 3a and 3b are front views showing modified examples of the shape of one end, Figure 4 is a vertical sectional view showing an example of a pipe joint in which the tool according to the present invention can be used, and Figure 5 is a front view. The lock ring in the pipe joint of FIG. 4 is shown, and a is a front view and b is a side view. 1... Working tool, 2a, 2b... Arm rod, 3, 11... Engaging protrusion, 5... Guide shaft, 6... ...Boruto, 7...Natsuto, 8
...Support boss, 9...Support hole, 10.
...Brim, 12...Abutting and engaging surface.

Claims (1)

[Scope of utility model registration request] A pair of arm rods are provided at one end having a retaining portion with opposing split end surfaces of the lock ring, and a guide shaft for guiding the pair of arm rods so as to be able to come into contact with and separate from each other is passed through the other end of each arm rod. ,
A power tool for a lock ring, characterized in that a bolt is rotatably supported at an intermediate portion of one of the pair of arm rods, and a nut into which the bolt is screwed is fixed to the other arm rod.