JP3469520B2 - Gas tap - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a gas plug connectable to a flexible pipe joint for connecting a bellows pipe.

[0002]

2. Description of the Related Art As a flexible pipe joint, there is one as shown in FIG. The one in the drawing is configured separately from the gas plug. The tubular joint main body (1) and the tightening nut to be screwed into the rear end (right side in the drawing) of the joint main body (1). (2)
And an annular retainer (3) located in front of the tightening nut (2) in the joint main body (1).
In the drawing, the main body of the joint (1) is integrated with the gas plug by screwing the front end of the joint into the gas inlet of the gas plug. It may be integrally configured as a part.

A tightening nut (2) described later can be screwed into the inner peripheral surface of the rear end portion of the joint main body (1), and an engaging projection is formed on the inner peripheral surface in front of the screwing area. The part (11) is formed in an annular shape, and the retainer housing chamber (1
7) has been formed. An annular pipe receiving surface (15) and an annular groove (18) on the outside thereof are formed on the front end surface of the retainer housing chamber (17).
The annular groove (18) is loaded with an O-ring (14) for ensuring airtightness with the bellows tube (8).

The retainer (3) is housed in the joint main body (1) on the front side of the tightening nut (2). This retainer (3) has
A plurality of notches (32) axially cut from the downstream end are provided so that the thin portion (31) is formed at the upstream end that is the tightening nut (2) side. The front end side of the retainer (3) can be easily expanded and contracted. An annular flange (34) is projected on the outer peripheral surface, and a bellows tube is provided at the front end.
An annular engaging end (33) is formed so as to surround the valley (82) of (8) so as to surround it.

To assemble this flexible pipe joint, first, the retainer (3) is attached to the engaging end (3) from the upstream end of the joint main body (1).
3) Insert from the side. Then, the flange portion (34) engages with the engaging protrusion (11) of the joint main body (1) from the upstream side, and the retainer (3) is coaxially positioned with respect to the joint main body (1). To be done. After this, tighten the tightening nut on the joint main body (1).
Screw (2) so that the pressing end surface (25), which is the front end surface of the tightening nut (2), contacts the retainer (3).

In the flexible pipe joint assembled in this way,
When the bellows tube (8) is inserted, the leading edge (81) of this bellows tube (8) abuts the engaging end (33) of the retainer (3) as shown by the solid line in the figure. When the bellows tube (8) is pushed further in, the crests (81) at the tip of the bellows tube (8) push the engaging end (33) to the outer peripheral side, and the front end of the retainer (3) expands. As shown by the broken line in the figure, the crest portion (81) projects further forward than the engagement end portion (33). After that, the elastic end of the elastic ring (35) externally fitted to the retainer (3) causes the engagement end portion (33) to move.
The valley (82) following the peak (81) is surrounded, and the peak (81) of the bellows tube (8) is provided between the engaging end (33) and the pipe receiving surface (15).
Will be located. When the tightening nut (2) is tightened from this state, the retainer (3) is pushed by the tightening nut (2), and the engagement of the flange (34) with the engaging projection (11) is released. , The retainer (3) is pushed into the retainer housing chamber (17).

The retainer accommodating chamber (17) is formed in a cylindrical shape or a taper shape which substantially corresponds to the outer diameter of the retainer (3),
By forcibly pushing the retainer (3) into the retainer housing chamber (17), the diameter of the engaging end (33) of the retainer (3) is reduced, and the diameter reduction of this retainer (3) reduces the engagement. End (33)
Fits further into the trough (82) of the bellows tube (8) and the retainer
(3) will be fitted onto the trough (82) in a state where expansion is prevented.
Further, by tightening the tightening nut (2) to the final position, the engaging end portion (33) and the pipe receiving surface (15) flatten the pinch (81) of the bellows pipe (8). At the same time, it is pressed against the O-ring (14). In this way, the bellows tube (8) is connected to the joint in a state where the sealing property of the tip portion is secured.

As shown in FIG. 6, when the flexible pipe joint having the above structure is used for each of the gas inlet port and the gas outlet port of the three-way joint (10), the first side of the gas inlet port side is used. Joint part (1
The gas pipe (43) is connected to 0a), and the branch pipes (44a) and (44b) are connected to the other two second and third joint parts (10b) and (10c) on the gas outlet side, respectively. It As a result, the gas sent from the upstream side of the gas pipe (43) is supplied to the three-way joint (10).
Via, can be branched and sent to the branch pipes (44a) (44b) respectively, if the gas appliances (41) (42) are connected to the pipe terminals of the branch pipes (44a) (44b), respectively, Each gas appliance (4
The gas from the gas pipe (43) can be supplied to 1) and 42. However, each of the branch pipes (44a) (44b) has a gas plug (4
It is necessary to arrange 0a) and (40b).

[0009]

As described above, since each flexible pipe joint is only for connecting the bellows pipe as the pipe, each joint portion (10a) (10b) of the three-way joint (10) is ) (1
0c) must be connected to gas pipes (43) and branch pipes (44a) (44b), and branch pipes (44a) (44b) are to be equipped with gas plugs (40a) (40b), respectively. Since they must be installed, there is a problem in that parts and piping for connecting pipes to these gas plugs (40a) and (40b) are required, and the work for connecting pipes is complicated. An object of the present invention is to make it possible to directly connect a gas plug to the flexible pipe joint having the above-mentioned configuration. <Item 1>

[0010]

Means for Solving the Problems The solution means of the present invention taken to solve the above-mentioned problems is that "a tubular portion projects rearward from the outer periphery of an annular pipe receiving surface with which an end of a flexible pipe abuts. Joint main body, a tightening nut screwed into the tubular portion of the joint main body, and a front end portion that is positioned in front of the tightening nut and is tightened by the tightening nut so that the front end portion faces the pipe receiving surface. A gas plug that is an expandable and contractible annular body and is detachably connected to a flexible pipe joint of a type that includes a retainer that maintains a reduced diameter state at the final tightening position of the tightening nut. The retainer comprises a connecting cylinder portion having an annular flange body, which is insertable into the tightening nut and has a diameter larger than the inner diameter of the front end portion of the retainer, formed at the tip, and the flange body comprises:
With the tightening of the tightening nut, the front end portion of the retainer and the pipe receiving surface are held in a hermetically sealed state.

The connecting tube portion provided in the gas plug is inserted into the flexible pipe joint consisting of the joint main body, the retainer and the tightening nut. Then, the flange body provided at the tip end of the connection tube portion comes into contact with the front end portion of the retainer having an inner diameter smaller than that from the rear, but the diameter of the retainer can be expanded. Therefore, the inner diameter of the front end portion is enlarged by forcibly pushing in the connecting cylinder portion, and the flange body can pass through the front end portion. Then, by elastically returning the retainer, the front end portion of the retainer surrounds the body portion of the connecting tubular portion. In that state, when the tightening nut is tightened to the final tightening position in the tubular part mainly composed of the joint, the front end part is opposed to and close to the pipe receiving surface while maintaining the reduced diameter state, and the flange body is It is pinched and held between the receiving surface and the front end of the retainer,
The connecting tube portion of the gas plug is connected to the flexible pipe joint having the above-described structure in a retaining state and in an airtight state.

<2> In the above item 1, in the case where “the O-ring for ensuring the airtight state is provided on the pipe receiving surface in contact with the flange body”, tighten the tightening nut. By this, the front end surface of the flange body is pressed against the pipe receiving surface and simultaneously pressed against the O-ring.

<3> In each of the above items, “the outer diameter of the body of the connecting cylinder is set to be equal to or larger than the inner diameter of a waterproof annular packing provided on the inner peripheral surface of the tightening nut”.
In this configuration, the waterproof annular packing provided in the tightening nut is in airtight contact with the outer peripheral surface of the body of the connection tubular portion when the connection tubular portion is connected to the flexible pipe joint.

<4> In each of the above items, “the flange body is exposed to the outside from the tightening nut in a state of being clamped and held by the front end portion of the retainer and the pipe receiving surface. A male threaded portion is formed on the outer peripheral surface of the connection tubular portion, and a nut body that comes into contact with the rear end surface of the tightening nut in a state of being screwed into the male threaded portion is further provided. Since the nut body screwed to the connecting tubular portion is positioned in contact with the rear end surface of the tightening nut that presses the flange body against the pipe receiving surface in the joint main body through the retainer, The nut body functions as a locking prevention means for the tightening nut.

As the flexible pipe joint to which the connecting cylinder portion of the gas plug can be connected, "a retainer of a type that is engaged with and retained by the tightening nut so as to be rotatable relative thereto is provided, and the flange body is provided. May be clamped against the pipe receiving surface by a retainer of the above type.

[0016]

EFFECTS OF THE INVENTION By inserting and connecting the connecting tube portion having the above-described structure to the flexible pipe joint, the gas plug is directly connected to the flexible pipe joint having the above-mentioned structure which is conventionally arranged for connecting a flexible pipe. Since the flexible pipe joint can be used, the range of use of the flexible pipe joint is widened, and it is easy to use. When the gas tap is used by directly connecting it to the joint, piping is not required, so the number of parts for gas supply is reduced, manufacturing costs can be reduced, and connection work is simplified. It Furthermore, the space occupied by the gas pipe at the installation location of the gas appliance is also reduced.

According to the second aspect, in addition to the above effect, the flange body of the connecting cylinder portion of the gas plug is held by being clamped between the front end portion of the retainer and the pipe receiving surface, and is then brought into pressure contact with the O-ring. Since it is configured, the gas plug can be connected to the joint in a state where the sealing property is reliably ensured.

According to the item (3), even if there is a gap between the inner surface of the rear end portion of the tightening cylinder and the outer surface of the body portion of the connecting cylinder portion of the gas plug, dust, water droplets, etc. that enter through the gap are The waterproof packing blocks invasion of the inside of the installation position. That is, even during use with the gas plug connected to the joint, dust and the like will not enter the joint, so when connecting the flexible pipe instead of the gas plug for reuse. However, there is no inconvenience that the flexible tube is supported by the impurities such as dust entering the joint.

According to the fourth aspect, since the nut body is provided behind the tightening nut as a means for preventing the tightening nut from loosening, the tightening nut is inadvertently loosened during the connection of the gas plug, and the connecting cylinder is connected. There is no inconvenience in the mounting state of the parts.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
It will be described with reference to the drawings. FIG. 1 shows that a sliding gas plug (20) is adopted as a gas plug in the embodiment of the present invention, and the sliding gas plug (20) is connected to a three-way branch joint.
FIG. 9 is a cross-sectional view showing a state in which the flexible pipe joints (4a), (4b), and (4c) provided at the respective open ends of (4) are connected.

As the flexible pipe joints (4a) (4b) (4c) provided in the branch joint (4) of this embodiment, the joint main body (1) integrally provided in the branch joint (4) is used. ), And a retainer (3) which is inserted into the joint main body (1) and whose insertion end side is expandable and contractible in the radial direction, and is screwed into the open end of the joint main body so that the retainer (3) is inserted into the joint main body (1). ) And a tightening nut (2) that is pushed inward in the direction of ()). That is, the retainer (3) is provided with a plurality of notches cut in the axial direction from the downstream end so that a thin portion is formed at the upstream end which is the tightening nut (2) side. As a result, the front end side of the retainer (3) can be easily expanded and contracted.

The main body of the joint (1) in the gas passage of the branch joint (4)
On the outer peripheral side of the end edge continuous with, there is provided a pipe receiving surface (15) against which the insertion end of the bellows pipe (8) abuts, and further an annular groove is formed in the outer region of the pipe receiving surface (15). (18) is provided, and the annular groove (18) has a bellows tube in the same manner as the conventional one.
It is equipped with an O-ring (14) to ensure airtightness with (8).

Further, a hexagonal wrench engaging portion (25) is formed in a region rearward of the screwing portion of the tightening nut (2) into the joint main body (1), and its inner periphery is A recess (26) is formed over the entire circumference, and an annular packing (27) is loaded in the recess (26). The inner diameter of the annular packing (27) is a bellows pipe that can be connected to each of the flexible pipe joints (4a) (4b) (4c).
Insert the bellows pipe (8) into the joint as shown in the flexible pipe joint (4c) in the figure, which is approximately the same as the outer diameter of the synthetic resin covered pipe (80) that covers (8). Then, the covering pipe (80) comes into contact with the annular packing (27). This prevents rainwater, dust, etc. from entering the branch joint (4). Further, a C-shaped elastic ring (35) is externally fitted and attached to the outer periphery of the retainer (3) on the side of the insertion end, and the elasticity of the insertion end after the diameter is expanded. I am urging me to return.

The branch joint (4) has one gas inlet tube (45).
And two gas outflow cylinders (46) (47) provided so as to communicate with each other at a right angle to the joint (4c) provided at the end of the gas inflow cylinder (45). Is connected to the bellows pipe (8) as a continuous gas supply pipe from the outdoor pipe, and to the joints (4a) (4b) provided at the ends of the gas outlet cylinders (46) (47), respectively. According to the application, the bellows tube or the slide type gas plug (20) can be connected to each other. In the drawing, the fitting (4a) on the side of one gas outlet tube (46)
Shows a state in which a slide type gas plug (20) is connected, and the other side is not connected to the joint (4b) on the side of the gas outflow tube portion (47).

As the slide type gas plug (20), a stopper (2
1), the lift valve (22), and the spring (23) (24) for urging them in a normally closed state may be used. Said closure (21) and lift valve (22)
Is provided at one end of a gas rubber tube connected to a gas appliance and has a structure that does not open unless a special connector (not shown) commonly called a "socket" is connected. There is. In addition, a connection tube portion (5) is provided as a connection port portion for connecting and communicating with the gas flow path in the slide type gas plug (20).

The connecting tube portion (5) has a body portion (50) having an outer diameter smaller than the inner diameters of the tightening nut (2) and the retainer (3).
And a flange body (51) provided at the tip of the retainer (3). The outer diameter of the flange body (51) is an annular shape formed on the insertion end side of the retainer (3) and protruding inward. It is set to be larger than the inner diameter of the engaging end portion (33) and the outer diameter of the pipe receiving surface (15), and the outer diameter of the body portion (50) substantially matches the inner diameter of the annular packing (27). Yes or slightly larger than that.

The axial width of the flange body (51) is determined by tightening the tightening nut (2) up to the final tightening position.
About the distance from the pipe receiving surface (15) to the front end surface (36) of the engaging end (33) of the retainer (3) when the retainer (3) is pushed into the retainer housing chamber (17). It is set. That is, as seen in the flexible pipe joint (4c), the width of the bellows pipe (8) in the connected state is substantially the same as or slightly larger than the width of the crest portion of the flattened tip. It may be formed. To connect the slide type gas plug (20) having such a connecting tube portion (5) to the flexible pipe joint,
The connecting tube portion (5) may be inserted into the joint main body (1) in which the retainer (3) and the tightening nut (2) are assembled.

Since the outer diameter of the flange body (51) is as described above, the front end of the flange body (51) comes into contact with the engaging end portion (33) of the retainer (3) from the rear side. Joint end (3
Since it can be expanded and contracted in the radial direction from the insertion end side where the 3) is formed, the engaging end portion (33) is pushed outward by the flange body (51) by further pressing the connecting cylinder portion (5). Then, the insertion end of the retainer (3) is expanded. As a result, the flange body (51) is inserted farther into the branch joint (4) than the retainer (3), as shown in the figure.

The procedure for inserting the flange body (51) is the same as the procedure for projecting the mountain portion at the tip of the bellows tube forward of the engaging end portion (33). After that, the retainer (3) is elastically returned by the elastic return force of the elastic ring (35), and the engagement end (33) surrounds the body (50) near the base end of the flange body (51). The connecting cylinder portion (5) is attached to the joint (4a) in a retaining state.

Since the axial width of the flange body (51) is as described above, the tightening nut (2) is tightened on the joint main body (1) to the final tightening position, and the retainer (3) is tightened. When the flange body (51) is pushed into the retainer accommodating chamber (17), the flange body (51) is sandwiched between the pipe receiving surface (15) and the front end surface (36) of the retainer (3). The front end face (36) side of the retainer (3) accommodated in the retainer accommodating chamber (17) is maintained in the reduced diameter state, and thus the flange body (51) having a larger diameter than this is maintained.
Is retained by the retainer (3) that is pushed into the retainer accommodating chamber (17), and the outer peripheral end of the flange body (51) is beyond the pipe receiving surface (15) and the O-ring ( 1
It reaches 4) and is pressed by these. As a result, the connecting tube portion (5) is connected in an airtight state as shown in the joint (4a).

When the flange body (51) is pressed against the pipe receiving surface (15) in an airtight state by tightening the tightening nut (2), the outer peripheral surface of the body portion (50) of the connecting tubular portion (5) is Has a structure in which the annular packing (27) of the tightening nut (2) comes into contact, so when the connecting tube part (5) of the slide type gas plug (20) is inserted into the flexible pipe joint. The inside of the mounting position of the annular packing (27) is in a state where the sealing property is secured by the contact between the annular packing (27) and the body portion (50). Therefore, there is no inconvenience that impurities such as water droplets and dust enter the flexible pipe joint (4a) in the state where the slide type gas plug (20) is connected and the gas passage that follows it.

When the tightening nut (2) is tightened, the flange portion (34) of the retainer (3) engaged with the engaging convex portion (11) is forcibly pushed forward. However, by adopting a retainer (3) of a type in which the flange portion (34) is not deformed or damaged, if the sliding gas plug (20) is removed, the same flexible pipe joint (4a), for example, sliding gas plug It is also possible to connect the bellows tube (8) instead of (20).

To remove the sliding gas plug (20) from the fitting (4a), first loosen the tightening of the tightening nut (2) to the fitting main body (1), and then slide the tightening nut (2) into the sliding type. Gas tap (2
While moving to the 0) side, pull out the connecting tube portion (5) of the sliding gas plug (20) from the joint main body (1). Then, the retainer (3) is pushed by the flange body (51) of the connecting tubular portion (5), and is pushed out by the moving distance of the tightening nut (2). Then, when the tightening nut (2) is completely disengaged from the joint main body (1), the retainer (3) is also connected to the sliding gas plug (20).
Together with (5), it will be taken out from the joint (4a). After that, the engaging end (33) side of the retainer (3) is forcibly enlarged to connect the retainer (3) and the tightening nut (2) to the connecting tube (5).
Just pull it out.

Then, the retainer (3) and the tightening nut (2)
Again, after accommodating and assembling it into the joint main body (1),
Insert (8) from the tightening nut (2) side, and follow the procedure above.
Between the front end surface (36) of the retainer (3) and the pipe receiving surface (15), instead of the flange body (51) of the sliding gas plug (20),
As shown by the chain double-dashed line in Fig. 5, project the tip (81) of the bellows tube (8) and tighten the tightening nut (2) to the final tightening position, then retainer (3). Front end face of
The mountain portion (81) can be clamped and flattened between the pipe (36) and the pipe receiving surface (15) for connection.

In this way, the conventional flexible pipe joint is added to the bellows pipe.
Not only (8) but also the slide type gas stopper (20) can be connected, so that the flexible pipe joint can be used in a wider range, and the slide type gas stopper (20) can be used without using the unnecessary bellows tube (8). ) Can be directly connected to the joints (4a) (4b) (4c), the space occupied by the pipe for gas connection can be significantly reduced.

The above-mentioned embodiment has a tightening nut.
Although a joint in which (2) and retainer (3) are configured separately is adopted, the connecting cylinder part (5) equipped on the gas plug has the retainer (3) tightened as shown in FIG. It can also be connected to a flexible pipe joint having a structure in which it is rotatably connected to the nut (2). A gasket (16) is fitted to the pipe receiving surface (15) of the joint main body (1) in the joint having this structure.

The outer surface of the front end of the tightening nut (2) is mainly the joint.
It is screwed into the open end of (1) and has an annular groove (28) on its inner surface for locking the retainer (3) so that it can rotate and move axially. . An annular packing (27) is loaded on the inner surface of the spanner engaging portion (25) at the rear end, similar to the tightening nut (2) of the joint having the above-mentioned configuration.

The retainer (3) is fixed to a metal engaging portion (37) composed of four divided pieces and a rear end portion of the engaging portion (37) to hold each of the divided pieces in an annular shape. It consists of a synthetic resin guide cylinder (38), and the rear end of the guide cylinder (38) has an engagement protrusion (39) that engages with the groove (28) of the tightening nut (2). Has been formed. Since the guide tube portion (38) is made of elastically deformable synthetic resin, the engagement projection (39) is set in the recess groove (28) by reducing the diameter of the rear end of the guide tube portion (38). It will be rotatably fitted inside. The four locking portions (37) and the guide tube portion (38) are integrally fixed with an adhesive or the like.

In this way, the tightening nut (2) formed by integrally connecting the retainer (3) is screwed into the open end of the joint main body (1). Install the tightening nut (2) so that the distance between the front end surface of the locking part (37) and the gasket (16) corresponds to one ridge of the tip of the bellows tube (8). ), The spacer (13) is placed between the rear end of the joint main body (1) and the front end face of the spanner engaging part (25) of the tightening nut (2). ) Is attached.

The connecting tube portion (5) protruding from the gas plug is inserted into the flexible pipe joint having the above structure. The shape of the connecting tube portion (5) is set to be similar to that of the above-described embodiment, and the retainer (5) is forcibly inserted into the retainer (5). The diameter of the locking part (37), which is composed of the divided pieces that make up 3), is expanded, and the flange body (51)
Passes through between the locking portions (37) and contacts the gasket (16), as shown by the chain double-dashed line in FIG. From this state, as shown in Fig. 3, remove the spacer (13) and tighten the tightening nut.
When the (2) is tightened to the final tightening position, the retainer (3) rotatably engaged with the tightening nut (2)
It moves to the pipe receiving surface (15) side without rotating together with the tightening nut (2), the front end surface of the locking portion (37) is pushed into the retainer housing chamber (17), and the flange body (51 ) Is the locking part
It is pinched between the front end face of (37) and the gasket (16). As a result, the flange body (51) of the connecting tubular portion (5) becomes
The front end face of 7) and the gasket (16) are connected in an airtight state.

At the same time, the outer surface of the body portion (50) of the connecting tube portion (5) is attached to the annular packing (27) attached to the inner periphery of the tightening nut (2) near the upstream end thereof. A sealed state is secured on the inner side of the mounting portion of (27). The connecting cylinder part (5) is not limited to the slide type gas plug (20), but the inside of the cock body can be operated by the operation of the operation knob part which is interlocked with the plug and is projected upward. The gas cock of the type that opens and closes the plug body built in may be projected from the cock body. Further, in this case, the connecting cylinder part (5) can be used as a gas outflow port part as in the case of the above-described embodiment, and can also be used as a gas inflow port part to the gas cock.

FIG. 4 shows a gas plug according to another embodiment, which has an annular shape when connected to the proximal end side of the connecting tube portion (5), preferably a flexible pipe joint. Place the body (50) on the rear side of the packing (27) on the flange body.
(51) with an outer diameter not less than the outer diameter,
The threaded portion (52) is provided on the large diameter portion.

[0043] A nut body (5
3) is pre-screwed from the flange body (51) side of the connecting tube part (5) and is positioned near the base end part of the thread ridge (52), and in this state, tightening nut (2) ) Insert the connecting tube (5) into the flexible pipe joint from the rear of (), and attach it as described above. Then, in the connection completed state of the connection tubular portion (5), the nut body (53) is attached to the screw thread portion (52) so as to abut the rear end surface of the spanner engaging portion (25) of the tightening nut (2). If they are screwed together, the nut body (53) will function as a locking member for the tightening nut (2), and the tightening nut (2) and the joint main body (1) will not be screwed together. Carefully loosen and the tightening nut (2) moves rearward so that the flange body (51) of the retainer (3) is received on the pipe receiving surface.
It is possible to prevent the inconvenience that the pressing force applied to (15) is loosened.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a gas plug according to a first embodiment of the present invention is connected to a flexible pipe joint provided in a three-way joint.

FIG. 2 is a cross-sectional view showing a state in which the gas plug according to the first embodiment is inserted into another type of flexible pipe joint.

FIG. 3 is a cross-sectional view showing a state in which the gas pipe according to the first embodiment of the present invention is connected to the flexible pipe joint of FIG.

FIG. 4 is an explanatory diagram showing a connected state of a gas plug according to another embodiment.

FIG. 5 is a sectional view showing an example of a conventional flexible pipe joint.

FIG. 6 is a schematic configuration diagram showing a case where a conventional three-way joint is used.

[Explanation of symbols]

(1) ・ ・ ・ Mainly fittings (15) ・ ・ ・ Receiving surface (2) ・ ・ ・ Tightening nut (3) ・ ・ ・ Retainer (20) ・ ・ ・ Gas plug (5) ・ ・ ・ Connection tube (51) ・ ・ ・ Flange body

Continuation of the front page (56) Reference JP-A-7-239073 (JP, A) JP-A-9-189393 (JP, A) JP-A-8-14458 (JP, A) JP-A-11-22885 (JP , A) JP-A-11-201355 (JP, A) Actually open 3-105778 (JP, U) Actually open 64-18682 (JP, U) Utility model registration 2560351 (JP, Y2) (58) Field (Int.Cl. ⁷ , DB name) F16K 27/00-27/12 F16L 29/00-39/04

Claims (5)

(57) [Claims] 1. A joint main body in which a tubular portion projects rearward from the outer circumference of an annular pipe receiving surface with which an end portion of a flexible tube abuts, and a tightening nut screwed into the tubular portion of the main joint body. An expandable / retractable annular body located in front of the tightening nut and having a front end facing and approaching the pipe receiving surface by tightening the tightening nut, wherein the tightening nut has a reduced diameter at a final tightening position. A gas plug detachably connected to a flexible pipe joint of a type in which a retainer is maintained, the annular plug being insertable into the tightening nut and having a diameter larger than an inner diameter of a front end portion of the retainer. Is connected to the front end of the retainer and the pipe receiving surface, and the flange body is clamped and held in an airtight state by the tightening of the tightening nut. A gas tap characterized by being performed. 2. The gas plug according to claim 1, wherein an O-ring for ensuring the airtight state is provided on the pipe receiving surface in contact with the flange body. 3. The gas plug according to claim 1, wherein the outer diameter of the body of the connecting cylinder is set to be equal to or larger than the inner diameter of a waterproof annular packing provided on the inner peripheral surface of the tightening nut. Is a gas tap. 4. The gas plug according to any one of claims 1 to 3, wherein from the tightening nut, the flange body is clamped and held by the front end portion of the retainer and the pipe receiving surface. A male screw portion is formed on the outer peripheral surface of the connecting tubular portion exposed to the outside, and a nut body that contacts the rear end face of the tightening nut in a state of being screwed onto the male screw portion is further provided. The gas tap that is being used. 5. The gas plug according to any one of claims 1 to 4, wherein the flexible pipe joint is provided with a retainer of a type that is engaged with and held by the tightening nut so as to be relatively rotatable, The flange body is a gas plug that is pressed against the pipe receiving surface by a retainer of the above type.