JP3163008B2 - Supply and exhaust pipe connection device - Google Patents

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 supply / exhaust pipe having a connection receiving port formed at one end and an outer bead formed at an insertion port formed at the other end, an outside of the receiving port is provided.
Providing the cut window in a part of the peripheral, the receiving opening cut windows
The stopper ring is rotatably inserted outside of the cutout window at the portion where the stopper ring is located.
Is punched in a U-shape so that it faces in the circumferential direction.
Form a claw with the tip side of the U-shaped piece formed by punching inward, and attach the stopper ring formed with this claw.
By rotating toward the front end side of the nail, from cut windows the tip of the nail the receiving port is advanced within the outer bead performs <br/> stopper, the direction opposite from the stopper ring
A structure in which the tip of the claw is released from the outer bead by releasing the tip of the claw from the outer bead by rotating the tip of the claw at the edge of the cut window, thereby releasing the retainer. .

[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]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The size of the cut window formed in the receiving port of the supply / exhaust pipe and the size of the claw formed in the stopper ring are not limited, but at least the size of the outer bead formed on the insertion port side can be inserted into the outer bead. 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. 4, and the pawl 6 is rotated to the position (6 ') indicated by the alternate long and short dash line so that the pawl 6 is slid up at the edge of the cutting window 2. 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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-174166 (JP, A) JP-A-5-245076 (JP, A) Fully open 63-158675 (JP, U) Really open 1959 103512 (JP, U) Shokai Sho 63-56393 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23L 17/12 F16L 37/12 F23J 13/04

Claims (1)

(57) [Claims] 1. A fixed-size supply / exhaust pipe having a connection receiving port formed at one end and an outer bead formed at an insertion port formed at the other end, wherein a cut is made at a part of an outer periphery of the receiving port. Providing a window, outside of the cutout window of the receiving opening ,
Externally insert the stopper ring around the window to rotate freely
And a part of this stopper ring in the circumferential direction.
Punched in a U-shape and formed by this punching.
Form the nail with the tip side of the U-shaped piece facing inward.
Turn the stopper ring with the claw toward the tip of the claw
By rotating performs retained by the cutting window of the distal end of the nail the receiving port is advanced within the outer bead and the stopper ring is rotated in the opposite direction the pawl tip
By sliding the side up with the edge of the cut window , the tip of the nail
A structure for releasing the retainer by escaping from the outer bead, and a connection device for the supply / exhaust pipe.