JPH0139986Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a detachment prevention pipe joint.

Conventional configuration and its problems As shown in FIG.
2, and between the inner tapered surface 22 and the outer surface 24 of the socket 23, an outer tapered surface 25 that contacts the inner tapered surface 22, and an inner latching blade that contacts the outer surface of the socket 23. A detachment prevention pipe joint has been proposed that is provided with a ring 27 that is divided in the circumferential direction and has a diameter of 26. According to this configuration, when an ejection force is applied to the insertion port 23, the ring 27 is pressed toward the inner tapered surface 25 due to the frictional force between the outer surface 24 of the insertion port 23 and the inner peripheral latching blade 26. Due to the action of this inner circumferential tapered surface 25, the latch blade 26 is attached to the outer surface 2 of the socket 23.
4 to prevent it from coming off. However, with such conventional devices, there is a problem in that when a large ejection force is applied to the socket 23, slippage is likely to occur between the retaining blade 26 of the ring 27 and the outer surface 24 of the socket 23. .

Purpose of the invention Therefore, the purpose of the present invention is to prevent slippage between the rilling and the socket even if an ejection force is applied to the socket.

Structure of the invention In order to achieve the above object, the present invention applies an annular sealing material to the inner surface of the socket in a compressible pipe joint between the inner surface of the socket and the outer surface of the socket, and gradually expands the diameter toward the back of the socket. a first outer circumferential tapered surface that abuts the inner circumferential tapered surface, and a first outer circumferential tapered surface that is closer to the socket than the first outer circumferential tapered surface; Continuing with this first outer peripheral tapered surface on the opening end side,
a second outer circumferential tapered surface that is inclined at a steeper angle with respect to the tube axis direction than the first outer circumferential tapered surface; A ring is provided that has an inner circumferential retaining blade that comes into contact with the outer surface of the socket corresponding to the back side.

Therefore, when an ejection force is applied to the socket, the ring will fall in a direction centering on the boundary in a direction in which the second outer peripheral tapered surface approaches the inner peripheral tapered surface, so that the latching blade will not touch the outer surface of the socket. This effectively prevents slippage between the ring and the socket, and provides a reliable separation prevention function.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a tube socket, and 2 is an insertion port. On the inner surface of the socket 1, an inner flange 3, a sealing material pressure contact surface 4 in the tube axis direction, and an inner circumferential tapered surface 5 whose diameter gradually increases toward the back of the socket are formed in order from the open end. Reference numeral 6 denotes an annular sealing material that seals between the socket sockets, which is compressed between the sealing material pressure contact surface 4 and the socket outer surface 7, and is compressed by the inner flange 3.
It has been backed up.

Between the inner circumferential tapered surface 5 and the socket outer surface 7, a circumferentially split ring 8 having a diameter reducing force is provided. As also shown in FIG. It has a second outer circumferential tapered surface 10 that is continuous with the outer circumferential tapered surface 9 . Reference numeral 11 denotes a boundary between both tapered surfaces 9 and 10, which has a ridge shape in the circumferential direction. Second outer peripheral tapered surface 10
is inclined at a steeper angle with respect to the tube axis direction 12 than the first outer circumferential tapered surface 9, and in this example, the angle between the first outer circumferential tapered surface 9 and the tube axis direction 12 is
The angle between the second outer peripheral tapered surface 10 and the tube axis direction 12 is 25 degrees. Inside the ring 8, there is a first inner circumferential retaining blade 1 that comes into contact with the outer surface 7 of the socket.
3 and a second inner circumferential retaining blade 14 are formed, and the first inner circumferential retaining blade 13 is located on the back side of the socket with respect to the boundary portion 11.

The pipes constituting the socket 1 and the socket 2 are made of ductile cast iron, and the ring 8 is made of hardened stainless steel.

In such a configuration, when an ejection force acts on the insertion port 2, the ring 8 is pressed toward the inner peripheral tapered surface 5 due to friction between the outer surface 7 of the insertion port and the inner peripheral locking blades 13 and 14. Then, the ring 8 falls in the direction in which the second outer circumferential tapered surface 10 approaches the inner circumferential tapered surface 5 with the boundary portion 11 as the center, and as shown in FIG.
The outer circumferential tapered surface 10 contacts the inner circumferential tapered surface 5, and the first inner circumferential retaining blade 13 bites into the socket outer surface 7. This effectively prevents slippage between the ring 8 and the socket 2,
A reliable separation prevention function can be obtained.

In addition, when joining the joint, it is only necessary to insert the socket 2 with the sealing material 6 and the ring 8 placed in the socket 1, and the work can be easily performed.

Further, in the above embodiment, the ring 8 is placed deeper than the sealing material 6, which is suitable for passing electric wires etc. into the pipe. When passing through the ring 8, the ring 8 may be placed closer to the opening end of the socket than the sealing material 6.

FIG. 4 shows another example of the ring 8,
In this example, the inner periphery of the ring 8 is cut into an arcuate cross section. 15 is the meat stealing department. In this way, the thickness of the ring 8 is reduced, so that the ring 8 becomes less rigid and bends easily, making it easier to fit into the socket 1 during the joining operation.

Effects of the Invention As described above, according to the present invention, it is possible to make the latch blade bite into the outer surface of the receptacle due to the fall of the ring, and it is possible to effectively prevent slippage between the ring and the receptacle. Thus, a reliable detachment prevention function can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of the present invention, Fig. 2 is a detailed view of the cross-sectional shape of the ring, Fig. 3 is a view showing the state when an extraction force is applied to the insertion opening, and Fig. 4 5 is a diagram showing another example of the ring, and FIG. 5 is a diagram showing a conventional example. 1...Socket, 2...Socket, 5...Inner peripheral tapered surface, 7...Socket outer surface, 8...Ring, 9...First
outer peripheral tapered surface, 10... second outer peripheral tapered surface,
DESCRIPTION OF SYMBOLS 11... Boundary part, 12... Tube axis direction, 13... First inner circumferential retaining blade.

Claims (1)

[Claims for Utility Model Registration] An inner circumferential tapered surface that gradually increases in diameter toward the back of the socket on the inner surface of the socket in a pipe joint in which an annular sealing material can be compressed between the inner surface of the socket and the outer surface of the socket. A first outer circumferential tapered surface that contacts the inner circumferential tapered surface is formed between the inner circumferential tapered surface and the socket outer surface, and a first outer circumferential tapered surface that is closer to the socket opening end than the first outer circumferential tapered surface. Continuing with the first outer peripheral tapered surface,
a second outer circumferential tapered surface that is inclined at a steeper angle with respect to the tube axis direction than the first outer circumferential tapered surface; A detachment prevention pipe joint characterized by being provided with a ring having an inner circumferential latching blade that comes into contact with the outer surface of the insertion port corresponding to the back side.