JPH1026341A - Connecting device for gas supply/exhaust tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize easy operation together with freedom from coming-off and reduce a manufacturing cost. SOLUTION: In a standard length gas supply and exhaust tube having a connecting receiver inlet 1 formed at its one end and having an outer bead 4 at its insertion port 3 side formed at the other end a structure that a window 2 is formed at the port 1 is provided. The structure further externally inserts a stopper ring 5 to the port 1 to make the stopper 5 an end 6a of a pawl 6 advance from the window 2 of the port 1 into the bead 4 to inhibit it from being removed. The structure further has a means for releasing the inhibition of removal of the pawl 6 from the bead 4 by sliding up the pawl 6 at the edge of the window 2 when the ring 5 is rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for connecting a supply / exhaust pipe of a combustion appliance or the like.

[0002]

2. Description of the Related Art In the case of a supply / exhaust pipe (cylinder) for a combustion apparatus, a pipe of a fixed size having a receiving port formed at one end and an insertion port at the other end is usually added. In the case of such a supply / exhaust pipe, a stopper is attached between the receiving port and the insertion port in order to prevent the once connected pipe from coming off and coming off.

[0003]

However, in the above-mentioned known stopper, once it is connected, it cannot be pulled out, or it can be pulled out, but the operation is troublesome, the structure is complicated, and the parts are complicated. Due to the large number, there is a disadvantage that the production is costly. SUMMARY OF THE INVENTION An object of the present invention is to propose a connection device for a supply / exhaust pipe which is inexpensive to manufacture and can be easily pulled out and stopped.

[0004]

The construction of the supply / exhaust pipe connection device according to the present invention is as follows. In a fixed-size air supply / exhaust pipe having a connection port formed at one end and an outer bead formed at the insertion port side formed at the other end, a cutout window is provided at the connection port. A claw is formed inward from a part of the stopper ring inserted outside, and the tip of this claw is inserted into the outer bead through the cutout window of the receiving port to prevent the stopper from coming off, and the stopper ring is rotated. A connection device for an air supply / exhaust pipe, characterized in that the claw is lifted up at the edge of the cutting window to release the outer bead to release the retaining.

[0005]

[Function] At the time of connection, first insert the stopper ring into the receiving port, and the tip of the stopper ring claw should be about the edge of the cut window. No In this state, when the insertion port of another supply / exhaust pipe is inserted into the receiving port to a predetermined position, the outer bead stops below the cut window at the tip of the claw.
When the stopper ring is rotated in this state, the distal end side of the claw enters through the cut window by its elastic action, and eventually enters the outer bead and stops. This state is the connection state,
The pawl acts as a stopper and the air supply / exhaust pipe cannot be pulled out.

Next, when pulling out, when the stopper ring is rotated in the direction opposite to the above, the claw is slid up at the edge of the cutting window, and the tip comes off the outer bead. Pulling the insertion port side in this state will make it easily come out.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The size of a cut window formed in a receiving port of a supply / exhaust pipe and a size of a claw formed in a stopper ring are not limited. It is necessary to be. At this time, if the width of the nail is small, play can be made. Therefore, the width that fits in the semicircular outer bead by about 1/3 to 2/3 is best. The claw may be formed by punching out a stopper ring, or a plate-shaped claw may be attached to the stopper ring by spot welding or the like.

[0008]

1 and 2 show a connection device according to the present invention and a receiving port side and an insertion port side of a supply / exhaust pipe. Reference numeral 1 denotes a receiving port. 2 are formed.
Reference numeral 3 denotes an insertion port, in which an outer bead 4 is formed. Reference numeral 5 denotes a stopper ring. The stopper ring 5 is formed with a claw 6 which faces in the circumferential direction and faces inward.

FIG. 3 is a cross-sectional view of the stopper ring 5, wherein the pawl 6 is integrated with the stopper ring 5 by punching. 4 and 5, the stopper ring 5 is externally inserted into the receiving port 1, the insertion port 3 is inserted into the receiving port 1, and the tip 6 a of the claw 6 of the stopper ring 5 is engaged from the cutout window 2 into the outer bead 4. In this state, the insertion port 3 cannot be pulled out of the receiving port 1.

FIG. 6 shows that the stopper ring 5 is rotated in the direction of the arrow in FIG. This shows a state in which the tip 6a has been removed from the outer bead 4, and the insertion port 3 side can be freely pulled out in this state.

[0011]

As described above, according to the present invention, a cutout window is formed on the receiving port side, a claw is formed on the stopper ring, and this pawl is engaged with the outer bead of the insertion port via the cutout window. To prevent pull-out, simply pull the stopper ring in the opposite direction. As a result, the connection and withdrawal operations are simple, and the cutting window and the stopper ring claw can be manufactured only by punching with a press or the like, so that the manufacturing cost is low. Further, since the claw is securely engaged with the outer bead by its elastic action, there is no fear that the claw will come off even if an external force is applied carelessly, and the claw is safe.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a connection device according to the present invention.

FIG. 2 is a cross-sectional view of the connection device according to the present invention.

FIG. 3 is an explanatory view of a stopper ring.

FIG. 4 is an explanatory view of a state where a supply / exhaust pipe is connected.

FIG. 5 is a sectional view taken along line AA ′.

FIG. 6 is an explanatory view of a state in which a tip of a claw of a stopper ring is made to escape to be pulled out.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Acceptance opening 2 Cut window 3 Insertion opening 4 Outer bead 5 Stopper ring 6 Claw 6a Tip

Claims (1)

[Claims] 1. A fixed-size air supply / exhaust pipe having a connection receiving port formed at one end and an outer bead formed at an insertion port side formed at the other end, wherein a cut window is provided at the receiving port. A claw is formed inward from a part of the stopper ring externally inserted into the receiving port, and the tip of the claw is inserted into the outer bead through the cutout window of the receiving port to prevent the stopper from coming off, A structure in which a stopper ring is rotated to lift a pawl at an edge of the cut window to release the outer bead and release the stopper, thereby releasing the supply / exhaust pipe connection.