JPH06100302B2 - Detachment prevention fitting - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a separation prevention fitting.

2. Description of the Related Art In one of the conventional separation prevention pipe joints, the insertion port of the mating pipe is inserted into the receiving port of one of the pipes via a ring-shaped sealing material, and is directed to the inside of the receiving port from its open end toward the inside. An inner peripheral tapered surface gradually increasing in diameter is formed, and an outer peripheral surface contacting the inner peripheral tapered surface and an inner peripheral hooking blade contacting the outer peripheral surface are provided between the inner peripheral tapered surface and the outer peripheral surface of the insertion opening. There is one in which a lock ring divided in the circumferential direction is bonded. This detachment prevention pipe joint elastically expands the diameter of the lock ring slightly when the insertion port is inserted into the inner circumference hooking blade of the lock ring, and the diameter reducing force as the restoring force is applied to the inner circumference hooking blade. Given to. Therefore, the inner peripheral hooking blade clings to the outer surface of the insertion slot. When the pulling force acts on the joint portion, the outer peripheral surface of the lock ring is pressed against the inner peripheral tapered surface of the receiving port, and the wedge action of the inner peripheral tapered surface generates a strong reducing force on the lock ring. Therefore, the inner peripheral hooking blade is held so as to bite into the outer surface of the insertion opening to prevent the joint portion from coming off.

Problems to be Solved by the Invention However, according to the above-described conventional configuration, due to dimensional tolerances in the lock ring, the inner peripheral taper surface, etc., there is a risk that the inner peripheral hooking blade of the lock ring will not be sufficiently clung to the outer surface of the insertion opening. There was a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to sufficiently hold a lock ring in an insertion opening.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a pipe joint in which an insertion opening of one pipe to be connected to the other pipe is inserted through an annular sealing material. In the inner surface of the receiving opening, an inner peripheral taper surface that gradually expands inward from its opening end, an annular groove that follows this inner peripheral taper surface, and a locking surface in the pipe axis direction that follows this annular groove. And a lock ring which is divided in the circumferential direction and has an outer peripheral surface in contact with the inner peripheral tapered surface and an inner peripheral hooking blade in contact with the outer peripheral surface of the insertion opening, is formed between the inner peripheral tapered surface and the insertion outer surface. Then, an elastic ring is attached to the annular groove so that the lock ring is pressed against the inner peripheral taper surface from the rear surface of the lock ring so that the inner peripheral hooking blade can be clung to the outer surface of the insertion opening. The structure is such that a locking portion capable of contacting the surface is formed.

Operation In the above-mentioned structure, since the same lock ring as the conventional separation preventing pipe joint can be mounted, the connection and separation preventing function of the joint portion is performed in the same manner as the conventional pipe joint. Moreover, even if there are dimensional tolerances on the lock ring or the inner peripheral tapered surface, the elastic ring presses the lock ring from the back surface to the inner peripheral tapered surface,
A diameter reducing force is generated in the lock ring, and the retaining ring on the inner circumference securely and strongly clings the outer surface of the insertion slot. Also, since the elastic ring has a locking part that can come into contact with the locking surface on the inside of the receiving port, even if the lock ring expands and moves to the back side of the receiving port when joining joints, etc. The ring is prevented from falling excessively, and thereafter, due to the restoring force of the elastic ring due to the deformation of the locking portion or the like, the lock ring is pushed back to its original position and clings to the outer surface of the insertion slot.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the separation preventing pipe joint of the present embodiment, the insertion port 5 of the other pipe 4 is inserted into the receiving port 3 of the one pipe 2 to be connected to each other, and the sealing material is provided between the receiving port 3 and the insertion port 5. 6, the lock ring 7 and the elastic ring 8 are attached. The pipe 2 is a cast iron pipe having an inner surface provided with a mortar lining 9, and a receiving port 3 is formed at an end portion on the connection side. The inner surface of the receiving port 3 is formed with an inner peripheral taper surface 10 which gradually expands inward from the opening end and an annular groove 11 following the inner peripheral taper surface, and an annular projection 12 and a sealing material pressure contact member are formed on the inner side thereof. A surface 13 is formed.
An annular protrusion 14 for engaging a sealing material is formed on the sealing material pressure contact surface 13. The pipe 4 is a cast iron pipe having an inner surface provided with a mortar lining 15, and the above-mentioned insertion port 5 is formed at the end portion on the connection side.

The lock ring 7 is a metal annular body having a radial contraction and divided in the circumferential direction, and has an outer peripheral tapered surface 16 in contact with the inner peripheral tapered surface 10.
The inner peripheral taper face 10 is formed in the inner peripheral taper surface 10 while the two inner peripheral retaining blades 17 are formed in the peripheral direction. The elastic ring 8 is an annular body made of an elastic material such as rubber, and has an annular pressing portion 18 on the front surface and an annular locking portion 19 on the rear surface and is formed in an L-shaped cross section. The lock ring 7 is fitted into the annular groove 11 and the end surface of the pressing portion 18 presses the lock ring 7 from the back surface thereof to the inner peripheral tapered surface 10. Therefore, the outer peripheral taper surface 16 of the lock ring 7 is
The lock ring 7 is in a state of being clung to the outer surface of the insertion slot 4 due to the wedge action between the tapered surfaces 16 and 10.

On the inner surface of the receiving port 2 between the annular groove 11 and the annular protrusion 12, a locking surface 20 in the pipe axis direction is formed. Further, the elastic ring 8 is integrally formed with a locking portion 19 having a triangular cross section that can contact the locking surface.

In the above configuration, in order to join the two tubes 2 and 4, the insertion port 5 is inserted into the receiving port 3 while the lock ring 7, the elastic ring 8 and the sealing material 6 are stored in the receiving port 3. At that time, the second
As shown in the figure, the lock ring 7 is slightly expanded in diameter by elastic deformation and moves to the rear side of the receiving port to elastically deform the elastic ring 8. At this time, the engaging portion 19 of the elastic ring 8 is engaged with the engaging surface 20.
The elastic ring 8 is prevented from excessively collapsing by being contacted with. After the joining work of the joint is completed, the lock ring 7 is pushed back by the restoring force of the elastic ring 8. As a result, the outer peripheral taper surface 16 of the lock ring 7 is returned to the receiving port 3 again.
When the lock ring 7 comes into contact with the inner peripheral taper surface 10 and a reducing force is generated, therefore, even if there are dimensional tolerances in the lock ring 7 or the inner peripheral taper surface 10, etc. Clings to the outer surface of the insertion slot 5.

When the pulling force acts on the joint portion, the outer peripheral tapered surface 16 of the lock ring 7 is pressed against the inner peripheral tapered surface 10 of the receiving port 3, and the wedge action between both tapered surfaces 16 and 10 causes a strong contraction to the lock ring 7. Radial force occurs. Therefore, the inner circumference stop blade 17
Clinging to the outside of the mouth 5, hug it,
To prevent the departure.

As described above, the elastic ring 8 freely deforms when the insertion opening 5 is inserted into the receiving opening 3 to allow the diameter of the lock ring 7 to expand, and after insertion, the elastic ring 8 is restored by the restoring force.
Is pressed against the inner peripheral tapered surface 10 to apply a diameter reducing force to the lock ring 7 to ensure that the inner peripheral hooking blade 17 is securely attached to the insertion opening 5.

EFFECTS OF THE INVENTION As described above, according to the present invention, since the lock ring is pressed toward the inner peripheral taper surface by the elastic ring, it is possible to prevent the inner peripheral hooking blade of the lock ring from clinging to the outer surface of the insertion opening. As a result, even if there is dimensional tolerance in the lock ring and inner tapered surface, it is possible to obtain a reliable separation prevention function, and the elastic ring contacts the locking surface on the inner surface of the receiving port. Since the lockable part is formed, it is possible to prevent the elastic ring from falling excessively even when the lock ring expands and moves to the rear side of the receiving port when joining the joint, etc. With the restoring force of the elastic ring based on the deformation of the locking portion and the like, the lock ring can be pushed back to the original position and held on the outer surface of the insertion slot.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing the action of an elastic ring. 3 ... Receptacle, 5 ... Insert, 7 ... Lock ring, 8 ...
Elastic ring, 10 ... Inner taper surface, 11 ... Annular groove, 17 ...
… Inner circumference stop blade.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 61-55574 (JP, U) Japanese Patent Sho 59-47473 (JP, B2) Actual Sho 56-18767 (JP, Y2)

Claims (1)

[Claims] 1. A pipe joint in which an insertion opening of the other pipe is inserted into a receiving opening of one of the pipes to be connected to each other through an annular sealing material, and is directed to an inner surface of the receiving opening from an opening end thereof to an inward direction. An inner peripheral taper surface that gradually increases in diameter, an annular groove that follows this inner peripheral taper surface, and a locking surface in the pipe axis direction that follows this annular groove. In the meantime, a circumferentially split lock ring having an outer peripheral surface in contact with the inner peripheral taper surface and an inner peripheral retaining blade in contact with the outer surface of the insertion slot is mounted, and the lock ring is inserted in the annular groove from its rear surface. An elastic ring is attached to hold the inner peripheral hooking blade to the outer surface of the insertion opening by pressing it against the peripheral taper surface, and the elastic ring is formed with a locking portion capable of contacting the locking surface. Preventive disconnection fitting.