JP3903368B2 - Pipe joint structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
Since the present invention can prevent eccentricity of an elastic ring fitted into a groove for a lock ring, in particular, a groove for a lock ring, the axis of the lock ring and the receiving port can be matched, and the insertion port The present invention relates to a pipe joint structure that can be easily inserted into a receptacle.
[0002]
[Prior art]
Japanese Unexamined Patent Publication No. Hei 6-2791 discloses a push-on type pipe joint structure. Hereinafter, this pipe joint structure is referred to as a conventional joint and will be described with reference to the drawings.
[0003]
FIG. 6 is a partial sectional view showing a conventional joint, and FIG. 7 is a front view showing an elastic ring of the conventional joint.
[0004]
6 and 7, 21 is a receiving port, 22 is an insertion port, 23 is a packing inserted in a gap between the receiving port 21 and the insertion port 22, and 24 is fixed to the outer periphery of the distal end of the insertion port 22. The stop ring 25 is a lock ring groove formed in the inner periphery at the back of the packing 23 of the receiving port 21, 26 is a lock ring that can be expanded and contracted in the groove 25, and 27 is a lock ring. 26 and an elastic ring provided between the groove 26 and the groove 25.
[0005]
The lock ring 26 has such a dimension that a gap is formed between the lock ring 26 and the lock ring groove 25 in a reduced diameter state. Therefore, the lock ring 26 is not arranged concentrically with the receiving port 21 unless the lock ring 26 is fitted into the lock ring groove 25 via the elastic ring 27. If the lock ring 26 is eccentric, the distal end of the insertion opening 22 is caught by the lock ring 26 and obstructs the insertion of the insertion opening 22 into the receiving opening 21.
[0006]
As shown in FIG. 7, the elastic ring 27 is formed by radially forming protrusions 27 </ b> A on the inner periphery of the rubber ring. The protrusion 27A has a function of holding the lock ring 26 in the lock ring groove 25 without being eccentric.
[0007]
According to the conventional joint configured as described above, the receiving port 21 and the insertion port 22 are joined as follows.
[0008]
First, the elastic ring 27 is fitted into the lock ring groove 25, and then the packing 23 is fitted into the entrance of the receiving port 21. Next, the diameter of the lock ring 26 is reduced by a jig, and the lock ring 26 is fitted into the elastic ring 27 in this state. The lock ring 26 fitted in the elastic ring 27 is expanded in diameter by an elastic force. At this time, the lock ring 26 is held in the elastic ring 27 without eccentricity by the action of the protrusion 27A. The insertion port 22 is inserted into the receiving port 21 until the stop ring 24 spreads the packing 23 and the lock ring 26 and passes through the lock ring 26. Thereby, the receiving port 21 and the insertion port 22 are joined.
[0009]
When a pulling force is applied to the joint in this state, the stop ring 24 engages with the lock ring 26, and the pipe is prevented from being pulled out.
[0010]
[Problems to be solved by the invention]
However, the conventional joint described above has the following problems.
[0011]
The protrusion 27A formed on the inner periphery of the elastic ring 27 certainly prevents the lock ring 26 from being eccentric, but the elastic ring 27 may be eccentric in the lock ring groove 25. When the elastic ring 27 is eccentric, the lock ring 26 cannot be easily fitted into the elastic ring 27 and the lock ring 26 is eccentric.
[0012]
Accordingly, an object of the present invention is to prevent the eccentricity of the elastic ring fitted in the lock ring groove, so that the axis of the lock ring and the receiving port can be matched, and the insertion port is received. An object of the present invention is to provide a pipe joint structure that can be easily inserted into a mouth.
[0013]
[Means for Solving the Problems]
The invention according to claim 1 is a packing inserted in a gap between the receiving port and the insertion port, a stop ring fixed to the outer periphery of the tip of the insertion port, and an inner periphery of the back part from the packing of the receiving port. A lock ring groove formed, a lock ring with an expandable / contractable diameter fitted in the groove, and an elastic ring provided between the lock ring and the groove, and a pulling force acts on the joint. In the pipe joint structure in which the stop ring is engaged with the lock ring to prevent the pipe from coming out, a plurality of projecting pieces are formed on the outer peripheral surface of the elastic ring. On the inner peripheral surface, protrusions curved in an L-shaped cross section are formed along the inner peripheral surface, and the protruding pieces are arranged radially on the outer periphery of the elastic ring. is there.
[0015]
The invention described in claim 2 is characterized in that the protrusion is curved in an L shape in the direction of the receiving end.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
One embodiment of the pipe joint structure of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a partial cross-sectional view showing the pipe joint structure of the present invention in a state where the insertion port is inserted into the receiving port, FIG. 2 is a front view showing the elastic ring of the pipe joint structure of the present invention, and FIG. 4 is a partial perspective view showing an elastic ring of the pipe joint structure of the present invention, FIG. 4 is a partial cross-sectional view showing a state before the insertion port is inserted, and FIG. 5 is a partial cross-sectional view showing a state when the insertion port is inserted. .
[0018]
1 to FIG. 5, 1 is a receiving port, 2 is an insertion port, 3 is a packing inserted into a gap between the receiving port 1 and the insertion port 2, and 4 is fixed to the outer periphery of the distal end of the insertion port 2. The stop ring 5 is a lock ring groove formed in the inner periphery at the back of the packing 3 of the receiving port 1, 6 is a lock ring that can be expanded and contracted in the lock ring groove 5, and 7 An elastic ring provided between the lock ring 6 and the lock ring groove 5.
[0019]
As shown in FIGS. 2 and 3, the elastic ring 7 has protrusions 7A radially formed on the outer peripheral surface of the rubber ring, and the protrusions curved in an L-shaped cross section toward the end of the receiving port 1 on the inner peripheral surface. 7B is formed along the inner peripheral surface.
[0020]
According to the joint of this invention comprised in this way, the receiving port 1 and the insertion port 2 are joined as follows.
[0021]
First, the elastic ring 7 is fitted into the groove 5 for the lock ring. Next, the diameter of the lock ring 6 is reduced by a diameter reduction jig, and in this state, the lock ring 6 is fitted into the elastic ring 7. As shown in FIG. 4, the lock ring 6 fitted in the elastic ring 7 is expanded in diameter by an elastic force. Thus, the lock ring 6 is fitted on the inner peripheral side of the L-shaped protrusion 7B of the elastic ring 7, and the protrusion 7A on the outer peripheral surface of the elastic ring 7 contacts the lock ring groove 5 of the receiving port 1. Therefore, the elastic ring 7 is fitted into the lock ring groove 5 without eccentricity by the action of the projection 7A, and thereby the axis of the lock ring 6 is surely aligned with the axis of the receiving port 1.
[0022]
Next, the packing 3 is fitted into the entrance of the receiving port 1. Then, as shown in FIG. 5, the stop ring 4 spreads the packing 3 and the lock ring 6, and the insertion port 2 is inserted into the receiving port 1 until it passes through the lock ring 6 as shown in FIG. 1. Thereby, the receptacle 1 and the insertion slot 2 are joined. In the state shown in FIG. 5, the diameter of the lock ring 6 is maximized, and the protrusion 7A and the protrusion 7B of the elastic ring 7 are compressed and deformed to the maximum. Thereby, insertion of the insertion slot 2 becomes easy.
[0023]
When a pulling force is applied to the joint in the state shown in FIG. 1, the stop ring 4 engages with the lock ring 6 to prevent the pipe from coming out.
[0024]
【The invention's effect】
As described above, according to the present invention, the eccentricity of the elastic ring fitted into the groove for the lock ring by forming the protruding piece on the outer peripheral surface of the elastic ring and the L-shaped protrusion on the inner peripheral surface. Therefore, the axial center of the lock ring and the receiving port can be made to coincide with each other, and the insertion port can be easily inserted into the receiving port by the deformation of the protruding piece and the protrusion of the elastic ring. Such a useful effect is brought about.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a pipe joint structure according to the present invention in a state where an insertion slot is inserted into a receiving slot.
FIG. 2 is a front view showing an elastic ring having a pipe joint structure according to the present invention.
FIG. 3 is a partial perspective view showing an elastic ring of the pipe joint structure of the present invention.
FIG. 4 is a partial cross-sectional view showing a state before the insertion port is inserted.
FIG. 5 is a partial cross-sectional view showing a state when an insertion slot is inserted.
FIG. 6 is a partial cross-sectional view showing a conventional joint.
FIG. 7 is a front view showing an elastic ring of a conventional joint.
[Explanation of symbols]
1: receiving port 2: insertion port 3: packing 4: stop ring 5: lock ring groove 6: lock ring 7: elastic ring 7A: protruding piece 7B: protrusion 21: receiving port 22: insertion port 23: packing 24: Stop ring 25: Lock ring groove 26: Lock ring 27: Elastic ring 27A: Projection piece

Claims (2)

A packing inserted in the gap between the receiving port and the insertion port; a stop ring fixed to the outer periphery of the tip of the insertion port; A lock ring that can be expanded and contracted in the groove, and an elastic ring provided between the lock ring and the groove, and when the pulling force is applied to the joint, the stop ring is In the pipe joint structure that prevents the pipe from coming out by engaging with the lock ring,
Wherein the outer peripheral surface of the elastic ring, a plurality of projecting pieces are formed on the inner peripheral surface of the elastic ring, ridges curved in an L-shaped cross section is formed along the inner peripheral surface, said protrusion Are radially arranged on the outer periphery of the elastic ring . The pipe joint structure according to claim 1, wherein the protrusion is curved in an L shape toward the receiving end .

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