JPH0319437B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a joint structure of an air supply and exhaust pipe used for combustion appliances such as gas stoves, water heaters, and the like.

[Prior Art] Since the air supply and exhaust pipes are of a fixed length and are extended outdoors, it is necessary to prevent them from accidentally slipping out once they are connected.

However, there are cases where it becomes necessary to remove the air supply and exhaust pipes that have been connected for some reason.

As a joint structure that satisfies these conditions, a locking hole is provided in the socket of the exhaust pipe, a locking tongue is attached that protrudes from the locking hole, and a locking tongue is attached to the insertion port side. There is a proposal to provide a circumferential groove in which the protrusion of the locking tongue engages. (Jitsukai 61-168389).

[Problem to be Solved] However, in the above-mentioned known example, the locking tongue protrudes from the outer circumferential surface of the exhaust pipe, which can easily cause injury, and the locking tongue may be pulled by something. The drawback is that it can easily fall out if it gets stuck. Also, since this locking tongue only engages with the groove due to its elastic action, it will not come off with a small force, but if a large force is applied, the locking tongue will escape by itself. In this case as well, there is a drawback that it can be missed.

An object of the present invention is to propose a joining structure for an air supply and exhaust pipe that is easy to join and remove, and that does not easily come off once fixed.

[Means for Solving the Problems] As a means for achieving the above object, the present invention proposes a joint structure for intake and exhaust pipes having the following structure.

1 A socket formed by forming a cut in a part of the outer periphery, and attaching a claw made of an elastic material with the tip facing toward the inner circumference and partially protruding outward into the cut, and a part of the outer periphery. an insertion opening formed by forming a circumferential groove into which the tip of the claw engages; and a stop ring rotatably fitted around the outer periphery of the socket and having a relief part for the claw formed in a part of the insertion opening. A joint structure of an air supply and exhaust pipe consisting of .

2. A socket formed by cutting a part of the outer periphery in a U-shape to form a claw portion with the tip depressed toward the inner circumference, and also making a U-shaped cut in a position symmetrical to this claw portion to form a release portion. and a joint of an air supply and exhaust pipe formed by forming a circumferential groove in a part of the outer periphery in which the tip of the claw part engages, and also forming a relief from which the release part can escape when displaced in the inner circumferential direction. structure.

In the above joint structure, in item 1, if the relief part of the stop ring is aligned with the position of the claw, the insertion opening can be inserted into the receiving opening. Then, when the stop ring is rotated to remove the escape portion from the pawl, the pawl is pushed by the stop ring and its tip is displaced in the inner circumferential direction and engaged in the circumferential groove. As a result, the insertion port inserted into the receiving port will not come out. Then, when the stop ring is rotated and the relief portion is aligned with the pawl, the pawl becomes free in the radial direction, and its elasticity causes the tip to come off the circumferential groove. As a result, the insertion port can be pulled out from the receiving port.

In the case of item 2, when the insertion opening is inserted into the receiving opening, the claw portion engages with the circumferential groove on the insertion opening side, and is connected in this state, and cannot be removed as it is. Therefore, when removing it, push in the release part on the opposite side of the claw part.
The force acting on the release portion acts as a reaction force on the claw side, and the claw side is lifted up and removed from the circumferential groove.
As a result, the insertion port can be pulled out from the receiving port.

[Example] The figures show an example of the present invention, in which FIGS. 1 to 3 correspond to claim 1, and FIGS. 4 to 6 correspond to claim 2.

Reference numeral 1 indicates the opening, which is one end of a fixed-length supply cylinder or exhaust pipe. Reference numeral 2 denotes one end of another fixed-length supply cylinder or exhaust cylinder inserted into the receiving port 1. Therefore, in the case of a normal supply/exhaust pipe, the receiving port 1 is provided at one end and the insertion port 2 is provided at the other end.

3 is a cut formed in a part of the outer periphery of the receiving opening 1, and this cut 3 has its tip 4' in the inner circumferential direction.
A claw (stopper) 4 is attached which is directed outward and has a protrusion 5 formed therein. The claw 4 is made of an elastic material, and the socket 1 is closed when no load is applied.
The tip 4' escapes from the inner surface of the tube.

Reference numeral 6 denotes a circumferential groove (engaging groove) formed on the outer periphery of the insertion opening 2, and is the position where the tip 5 of the pawl 4 engages when the insertion opening 1 is inserted.

7 is an O-ring 8 formed in a part of the insertion port 1.
This is the housing section for the.

Reference numeral 9 designates a stop ring that can be inserted into the outside of the socket 1, and a part of the stop ring is provided with the claw 4.
A relief part 10 is formed through which the water can escape to the outside.

In the above embodiment, when the insertion opening 2 is inserted into the receiving opening and the stop ring 9 is fitted onto the receiving opening 2 as shown in FIG.
The pawl 4 is pushed inward and its tip 4' engages in the circumferential groove 6.

As a result, the receiving port 1 and the insertion port 2 are fixed, and according to experiments, a strength of 40 kg or more is ensured in a cylinder with a straight line of 100 m/m.

When pulling out, the stop ring 9 is rotated as shown in FIG. 2, and when the relief part 10 is aligned with the claw 4, the claw 4 returns to its original position due to its elasticity.
The tip 4' is removed from the circumferential groove 6. As a result, the insertion port 2 can be easily removed.

In Fig. 4, reference numeral 10' denotes a stopper formed by making a U-shaped cut 11 in a part of the outer periphery on the side of the socket 1, and this claw part 10' is designed to protrude toward the inner circumference. is formed.

Reference numeral 12 denotes a release part (pushing part) formed by a notch 13 made at a symmetrical position (toward the opposite side) to the claw part 10', and the claw part 10' and the release part 1 are
A joint 14 with the socket 1 is formed between the two.

Reference numeral 15 denotes a relief formed on the outer circumferential surface of the insertion port 2 side at a portion facing the release portion 12 when inserted into the receiving port 1.

In this embodiment, an insertion opening 2 is provided within the receiving opening 1.
When inserted, the claw portion 10' engages in the circumferential groove 6 on the side of the insertion port 2, as shown in FIG. 5, and the insertion port 2 does not come out.

In order to pull it out, as shown in FIG. 6, when the release part 12 is pushed in with a finger, the release part 12 is pushed inward along the relief 15, and this reaction force acts on the claw part 10'. This claw portion 10' side rises and escapes from the circumferential groove 6.

As a result, the insertion port 2 can be removed.

In the case of the embodiment shown in Figs. 1 to 3, the relief parts of the pawl and the stop ring may be provided at multiple locations, but in the case of the embodiment shown in Figs.
Since it is troublesome to pull out while pushing in more than one place, it is better to do it in one place.

[Effects of the Present Invention] The present invention can achieve the following effects through the configuration and operation described above.

(a) In claim 1, since the pawl is prevented from escaping by the stop ring, once it is engaged with the circumferential groove, it will never come off.

As a result, there is no need to worry about the air supply and exhaust pipe coming off after installation, and by rotating the stop ring and letting it escape from the pawl, the pawl will be displaced from the circumferential groove due to its elasticity, so it can be easily removed even after it has been joined. Can be done.

b In claim 2, since the claw part and the release part are formed by making a cut in the socket, other materials will not protrude from the outer peripheral surface of the socket, and there will be no possibility that something will get caught. Since there are no parts, it will not come off accidentally, and since no other parts are required, it can be manufactured at low cost.

(c) In claim 2, when the release part is pressed, the claw part lifts up due to the reaction force, so no effort is required to remove it once it is connected.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of a joint structure that uses a stop ring to secure the pawl, and Fig. 2 is a sectional view of the state in which the insertion opening is inserted into the socket and the pawl escapes into the relief part of the stop ring. , Fig. 3 is a sectional view showing a state in which the stop ring in Fig. 2 is rotated and the pawl is engaged with the circumferential groove, and Fig. 4 is another embodiment in which the pawl part and the release part are formed directly in the socket. Fig. 5 is a sectional view showing the insertion slot inserted into the socket and fixed, and Fig. 6 shows the release part being pressed with a finger to release the claw part. FIG. 1... Reception port, 2... Insertion port, 4... Claw (stopper), 6... Circumferential groove (engaging groove), 9... Stop ring, 10'... Claw portion (stopper), 12...
...Release part, 15...Escape.

Claims (1)

[Scope of Claims] 1. A socket in which a cut is formed in a part of the outer periphery, and a claw made of an elastic material is attached inside the cut, the tip of which faces toward the inner circumference and partially projects outward. an insertion opening having a circumferential groove formed in a part of the outer periphery in which the tip of the claw engages; and an insertion opening rotatably fitted on the outer periphery of the socket and having a relief part for the claw in a part thereof. A joint structure between a stop spring formed by the above structure and an air supply and exhaust pipe formed by the above structure. 2. A socket formed by cutting a part of the outer periphery in a U-shape to form a claw portion with the tip depressed toward the inner circumference, and making a U-shaped cut in a position symmetrical to the claw portion to form a release portion. and a joint of an air supply and exhaust pipe, which has a circumferential groove formed in a part of the outer periphery in which the tip of the claw part engages, and a recess from which the releasing part can escape when displaced in the inner circumferential direction. structure.