JP2010038281A - Socket for connecting gas pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an advancing and retreating ring 2 from being carelessly pushed back to the retreating direction by external impact or mischief in the state of being connected to a plug part 3 in a socket for connecting a gas pipe in a structure that the advancing and retreating ring 2 energized to the advancing direction is advanced and is maintained to be in an advancing state of being protruded from an opening end 10 of an outer cylinder 1 for a prescribed length when the plug part 3 is connected, and connection of the plug part 3 is released when the advancing and retreating ring 2 is pushed back to the retreating direction. <P>SOLUTION: An advancing state maintaining means 20 for maintaining the advancing and retreating ring 2 in the advancing state is disposed on the outer cylinder 1 or the advancing and retreating ring 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gas pipe connection socket that can be attached to and detached from a plug portion of a gas plug with a single touch.

5 and 6 are generally used as sockets for connecting a gas pipe that can be attached to the end of a gas pipe and can be connected to the plug portion of the gas plug with a single touch.
The plug portion (3) provided so as to protrude from the gas stopper (31) communicates with the gas passage (34), and an annular concave groove (30) is formed in the outer peripheral portion of the tip.

The socket (4) is pressed against the end surface of the plug portion (3) and is urged toward the open end side (forward, upward in the drawing) of the socket (4) by the spring (42); A holding cylinder (43) fitted on the rubber cylinder (41), a locking ball (44) provided so as to penetrate the holding cylinder (43), and an axial slide with respect to the holding cylinder (43) Advancing and retracting ring (2) urged in the direction of protruding forward of socket (4) by spring (45), and freely slidable in the axial direction with respect to advancing and retracting ring (2) And an outer cylinder (1) to be externally fitted.
Note that a small-diameter step (47) is provided on the inner peripheral surface of the advance / retreat ring (2), and the socket (4) is not connected to the plug (3). The ball (44) is supported from the inner side of the holding cylinder (43) by the outer peripheral surface of the rubber cylinder (41) and protrudes outward from the outer peripheral surface of the holding cylinder (43). . The front end surface of the small-diameter step portion (47) of the holding cylinder (43) is engaged with the protruding portion of the locking ball (44) protruding outward from the holding cylinder (43) from the rear, so that the forward and backward movement is achieved. The ring (2) is maintained in the advance prevention state.

  The plug portion (3) to which the socket (4) having the above-described configuration is connected communicates with the gas passage (34) and is provided so as to protrude below the gas plug (31) in the case shown in FIG. . An annular concave groove (30) is formed on the outer periphery of the tip.

  When the socket (4) is fitted into the plug portion (3) of the gas plug (31) and pushed in, as shown in FIG. 6, the front surface of the rubber tube (41) is located at the tip of the plug portion (3). When pressed, the spring (42) contracts, and when the annular groove (30) of the plug portion (3) reaches the position where the locking ball (44) is disposed, the locking ball (44) Then, it is pushed inward by the small-diameter step portion (47) and fits into the annular groove (30). At the same time, the engagement of the small diameter step portion (47) with the locking ball (44) is released, and the advance / retreat ring (2) advances forward by the biasing force of the spring (45), and the advance / retreat ring (2) The large diameter portion (21) provided at the front end of the outer cylinder is separated from the open end (10) of the outer cylinder (1) by a predetermined distance. In this state, the outer side of the locking ball (44) is pressed from the outside by the inner peripheral surface of the small diameter portion (22) of the advance / retreat ring (2), and the locking ball (44) It will be engaged with the annular groove (30) of (3). As a result, the socket (4) is maintained in a state of being connected to the plug portion (3) in a retaining state.

  In this state, when the operation knob (35) of the gas plug (31) is turned to the open position, the overflow prevention valve (37), the plug (38) from the inlet (36) of the gas plug (31). ) Through which gas is supplied to the plug part (3).

A pipe connecting part (46) extends rearward at the rear end of the holding cylinder (43), and the gas rubber pipe (5) is connected to the pipe connecting part (46) for use.
Thereby, the gas sent from the inlet (36) is connected to the gas device (50) via the plug part (3), the socket (4), and the pipe connection part (46) and the gas rubber pipe (5). To be supplied.

Then, to remove the socket (4) from the plug portion (3), after turning the operation knob (35) of the gas plug (31) to the closed position, the large diameter portion (21 ) By pushing back backward with your finger. As a result, when the locking ball (44) is positioned in front of the small-diameter step portion (47) of the advance / retreat ring (2), the rubber tube (41) is elastically restored by the urging force of the spring (42), and the plug portion At the same time as pushing the end face of (3), the locking ball (44) is ejected out of the annular groove (30). Thereby, the socket (4) is removed from the plug part (3).
Japanese Patent Laid-Open No. 7-127784

  However, when such a socket (4) is connected to the plug part (3) of the gas plug (31) installed in the kitchen, the large diameter part (21) of the advance / retreat ring (2) If it is pushed to the open end side of the outer cylinder (1) for some reason, the socket (4) may come off from the plug part (3) as described above. At this time, if the socket (4) is completely removed from the plug part (3), the user can visually confirm the state, so if the gas plug (31) is open, the operation knob ( By rotating 35) to the closed position, gas outflow can be prevented. In addition, when the socket (4) is completely dropped, the overflow prevention valve (37) built in the gas stopper (31) is operated, so that no gas leakage occurs, but depending on the state of the gas rubber pipe (5), In some cases, the socket (4) is not completely separated from the plug part (3) and is incompletely held by the plug part (3).

For example, despite the fact that the locking ball (44) is detached from the annular groove (30) of the plug part (3), the tip of the plug part (3) is attached to the socket (by the elastic force of the gas rubber tube (5)). 4) It remains in the state fitted in, and in this state, if gas flows into the gas flow path (34), the sealing performance between the socket (4) and the plug part (3) is not secured, There is a disadvantage that gas leaks from the open end of the plug part (3). In such a state, the overflow prevention valve provided in the gas plug (31) does not operate, and a trace amount of gas continues to leak from the plug portion (3), which is dangerous.
According to the present invention, “a holding cylinder incorporating a connecting mechanism in which a plug part is detachable, a large-diameter part that is externally fitted to the holding cylinder so as to be able to advance and retreat and projects to the front end, and a subsequent small-diameter part. And an advancing / retreating ring biased in the advancing direction, and an outer cylinder fitted onto the small diameter portion of the advancing / retreating ring,
When the plug part is not connected, the advance / retreat ring is held in the advancement preventing state,
When the plug cylinder is connected to the holding cylinder, the advancement blocking state is released, and the advance / retreat ring is urged in the advancement direction so that the large diameter part and the small diameter part that follows the open part are opened. Maintained in the advanced state protruding a predetermined distance from the end,
When the advance / retreat ring is pushed back in the backward direction, in the gas pipe connection socket configured to release the connection of the plug part, the advance / retreat ring is connected to the plug part, and the advance / retreat ring is subjected to external impact and mischief. It is an object of the present invention to prevent it from being pushed back in the backward direction inadvertently.

(1) The socket for connecting a gas pipe of the invention according to claim 1 is characterized in that “the advance state holding means for holding the advance / retreat ring in the advanced state is provided in the outer tube or the advance / retreat ring”. Is.
When the socket is not used, the advancing / retreating ring is held in a state where the advancement / retreating is prevented, so that the outer cylinder is fitted over the entire small diameter portion of the advancing / retreating ring, and the large diameter portion protrudes from the open end of the outer cylinder. Is in a state. When the plug cylinder is connected to the holding cylinder from this state, the advancement / retraction ring is released from the advance / retreat ring by the action of the coupling mechanism, and the advance / retreat ring is urged in the advance direction by the urging means. . Along with this, the large-diameter portion is separated from the open end of the outer cylinder, and the subsequent small-diameter portion projects a predetermined length from the open end of the outer cylinder. This state is the advance state of the advance / retreat ring.
The advancing / retreating ring in the advancing state or the advancing / retreating ring is not retracted even if the retracting force is applied to the large diameter portion by providing the advancing state holding means on the outer cylinder. . Therefore, since the advance / retreat ring is held in the advanced state, the connection state of the plug portion is maintained.

(2) A socket for connecting a gas pipe according to a second aspect of the present invention is the socket according to the first aspect, wherein the advancement / retraction ring in the advanced state from the open end of the outer cylinder as the advanced state holding means. A C-shaped ring having a width that substantially matches the distance to the rear surface of the large-diameter portion and that can be tightly fitted to the small-diameter portion exposed from the open end of the outer cylinder. Even if a force in the backward direction is applied to the advancing / retreating ring in the advanced state, the rear surface of the large diameter portion comes into contact with the C-shaped ring, so that the open end of the outer cylinder to the rear surface of the large diameter portion. The distance is not shortened.

(3) The socket for connecting a gas pipe of the invention according to claim 3 is the one according to claim 1, wherein the outer cylinder is fixed to the holding cylinder on the rear end side of the holding cylinder. Divided into a fixed outer cylinder and a movable outer cylinder that can move forward and backward in the advance direction of the advance and retract ring,
The moving outer cylinder is moved in the advancing direction, and when the front end thereof is brought into contact with the rear surface of the large-diameter portion of the advance / retreat ring in the advanced state, the moving outer cylinder faces the rear end of the moving outer cylinder. A gap is formed between the fixed outer cylinder and the opposing surface.
The advancing state holding means is provided with a C-shaped ring having a width substantially coinciding with the gap and capable of being tightly fitted in the gap ”. It consists of two parts of the cylinder, and only the moving outer cylinder can be moved in the advance direction. Therefore, when the movable outer cylinder is moved until it contacts the rear surface of the large diameter portion of the advance / retreat ring in the advanced state, a gap is formed between the fixed outer cylinder and the movable outer cylinder. By fitting a C-shaped ring as advancing state holding means into this gap, movement of the moving outer cylinder in the backward direction is prevented, and the rear surface of the large diameter portion comes into contact with the front end of the moving outer cylinder. Therefore, the movement of the forward / backward ring in the backward direction is also prevented.

(4) The socket for connecting a gas pipe of the invention according to claim 4 is the one according to claim 2 or claim 3, wherein an annular fixing member is attached to the pipe connecting portion extending rearward of the holding cylinder. It is attached and the C-shaped ring is connected to the annular fixing member via a connecting band. ”When removing the socket from the plug portion, the C-shaped ring is removed from the advancing / retracting ring or the outer cylinder. After removal, the C-shaped ring is held by a ring-shaped fixing member attached to a pipe connection portion extending rearward of the socket via a coupling band. The annular fixing member is also attached from above the pipe connected to the pipe connecting portion.

(5) The socket for connecting a gas pipe of the invention according to claim 5 is the one according to claim 1, wherein the outer cylinder is fixed to the holding cylinder on the rear end side of the holding cylinder. Divided into a fixed outer cylinder and a movable outer cylinder that can move forward and backward in the advance direction of the advance and retract ring,
As the advance state holding means, the fixed outer cylinder and the movable outer cylinder are provided with screw parts that can be screwed together,
By loosening the threaded portion of the movable outer cylinder with respect to the threaded portion of the fixed outer cylinder, the front end of the movable outer cylinder comes into contact with the rear surface of the large-diameter portion of the advancing and retracting ring in the advanced state. The fixed outer cylinder and the movable outer cylinder are screwed together, and the advance distance of the movable outer cylinder from the fixed outer cylinder is determined by the degree of screwing of both. That is, when the moving outer cylinder is rotated in the tightening direction, the moving outer cylinder approaches the fixed outer cylinder, and when the moving outer cylinder is rotated in the loosening direction, the moving outer cylinder advances in the advance direction. Therefore, if the screwing of the movable outer cylinder to the fixed outer cylinder is loosened and the front end of the movable outer cylinder is brought into contact with the large diameter portion of the advancing / retreating ring in the advanced state, the movable outer cylinder is advanced from the large diameter portion. It functions as an advance state holding means for holding the state.

(6) The socket for connecting a gas pipe of the invention according to claim 6 is the one according to claim 1, wherein the outer cylinder is fixed to the holding cylinder on the rear end side of the holding cylinder. Divided into a fixed outer cylinder and a movable outer cylinder movable in the advancing direction of the advance / retreat ring;
As the advance state holding means, a cylindrical cam structure is provided on the fixed outer cylinder and the movable outer cylinder,
By rotating the movable outer cylinder by a predetermined angle with respect to the fixed outer cylinder, the movable outer cylinder can move until its front end abuts on the rear surface of the large-diameter portion of the advance / retreat ring in the advanced state. age,
An engagement member that engages with each other and prevents reverse rotation of the movable outer cylinder when the movable outer cylinder is rotated to the final movement state is provided. Instead, by providing a cylindrical cam structure, the movable outer cylinder can be rotated in the advancing direction by rotating with respect to the fixed outer cylinder. When the moving outer cylinder is rotated until the front end of the moving outer cylinder contacts the rear surface of the large-diameter portion of the advancing / retreating ring in the advanced state, the moving outer cylinder is engaged with the moving outer cylinder. Rotation in the opposite direction is prevented.

  As described above, according to the first aspect of the present invention, the advancing / retreating ring connected to the plug portion and being in the advanced state remains held in the advanced state by the advanced state holding means. Even if a force in the backward direction is applied to the diameter portion due to an external impact or mischief, it does not move backward. Therefore, since the socket does not inadvertently come off from the plug portion, there is no danger that the gas plug is opened without knowing that it is detached and gas leakage occurs.

  Further, according to the invention according to claim 2, as long as the C-shaped ring is externally fitted to the small diameter portion exposed from the open end of the outer cylinder, the advance / retreat ring does not move in the backward direction. The effect similar to that of the first aspect can be obtained, and since the C-shaped ring is adopted as the advancement state holding means, it can be easily attached to and detached from the small diameter portion, and can be applied to an existing socket. Can do.

  According to the invention of claim 3, the same effect as in claim 1 can be obtained, and the outer cylinder is divided into a fixed outer cylinder and a moving outer cylinder, and the moving outer cylinder is moved. Thus, the C-shaped ring is externally fitted into the gap formed between the two, so that the gap is not exposed to the outside when the socket is not used. Therefore, even if the gap portion is damaged due to the mounting of the C-shaped ring, the scratch is concealed when the socket is not used.

  Further, according to the invention of claim 4, since the C-shaped ring of claim 2 or claim 3 is connected to the annular fixing member, the C-shaped ring after the socket is removed from the plug portion is removed. It is possible to prevent the inconvenience of losing the C-shaped ring during use.

  Further, according to the inventions according to claims 5 and 6, the moving outer cylinder can be moved in the advancing / retreating direction only by rotating the moving outer cylinder, so that the advancement state holding means can easily function. Can do. Further, since the advancing state holding means is provided at the rear end portion of the outer cylinder, it can be applied not only to an exposed type gas stopper but also to an embedded type gas stopper such as a box cock.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
In FIG. 1, the gas pipe connection socket of the first embodiment is connected to the plug portion (3) and the advancing / retracting ring (2) of the socket (1) is held in the advanced state. It is sectional drawing which shows the state which provided the C-shaped ring (20) as an advancing state holding means in the advancing / retreating ring (2).
The socket can have the same configuration as the socket (4) described in the conventional example, and the large-diameter portion (21) of the advance / retreat ring (2) protrudes from the open end (10) of the outer cylinder (1). The advancing / retracting ring (2) is moved by the spring (45) interposed between the rear end (23) of the advancing / retracting ring (2) and the step (48) in the outer cylinder (1). It is biased in the direction protruding forward (the advance direction) with respect to (1).

The holding cylinder (43) that is fitted inside the outer cylinder (1) and the advance / retreat ring (2) and into which the plug portion (3) is inserted has three through holes (49) formed at equal intervals in the circumferential direction. Each of the through holes (49) is fitted with a locking ball (44).
When the plug portion (3) is inserted into the holding cylinder (43), the locking ball (44) is fitted into the annular groove (30) of the plug portion (3) as detailed in the description of the conventional example. By engaging, the engagement between the locking ball (44) and the small diameter step (47) on the inner peripheral surface of the advance / retreat ring (2) is released, and the advance / retreat is made from the open end (10) of the outer cylinder (1). The ring (2) protrudes for a predetermined length.

  The advancing / retracting ring (2) is composed of a large-diameter portion (21) at the front end and a small-diameter portion (22) following it, and the advancing / retreating ring (2) projects from the open end (10) of the outer cylinder (1). By doing so, a part of the small diameter part (22) is exposed between the open end (10) of the outer cylinder (1) and the rear surface (24) of the large diameter part (21).

The C-shaped ring (20) has a width that substantially matches the length (L) of the exposed portion of the small diameter portion (22), and has an inner diameter that substantially matches the outer diameter of the small diameter portion (22). It is a material body and is attached by forcibly fitting to the small diameter portion (22).
By attaching the C-shaped ring (20) to the exposed part of the small-diameter part (22) of the forward / backward ring (2), the large-diameter part even if a force in the reverse direction acts on the large-diameter part (21). The rear surface (24) of (21) comes into contact with the C-shaped ring (20), and the forward / backward ring (2) is held in the advanced state without moving in the backward direction.
An annular fixing member (25) is attached to the pipe connecting portion (46) extended to the rear of the holding cylinder (43) via a gas rubber tube (5), and the annular fixing member (25) and The C-shaped ring (20) is connected via a connecting band (26). This prevents the C-shaped ring (20) from being lost when the C-shaped ring (20) is removed from the advanced / retracted ring (2). can do.

  2 shows the connection state of the socket (4) and the plug part (3) of the second embodiment, and the outer cylinder (1) is attached to the rear end of the holding cylinder (43). It is configured to be divided into a fixed cylinder part (11) to be fixed and a movable outer cylinder (12) that can move in a reciprocating manner in such a manner that it slides on the small diameter part (22) of the advance / retreat ring (2). .

  When the plug part (3) is connected to the holding cylinder (43) and the advance / retreat ring (2) advances in the advance direction, the front end (14) of the moving cylinder part (12) (the open end open end of the outer cylinder (1)) (Corresponding to (10)) moves the movable cylinder portion (12) in the advancing direction until it contacts the rear surface (24) of the large diameter portion (21) of the advancing / retreating ring (2) in the advancing state. At this time, a gap portion (16) is formed between the rear end rear surface (13) of the movable tube portion (12) and the facing surface (15) of the fixed tube portion (11) facing this. The C-shaped ring (201) is fitted into the gap (16).

  The C-shaped ring (201) of this embodiment has a width substantially equal to the width of the gap portion (16) and is a part of the fixed cylinder portion (11) constituting the gap portion (16). It is an elastic material body having an inner diameter substantially corresponding to the outer diameter, and a fixed cylinder portion of the movable cylinder portion (12) of the outer cylinder (1) by externally fitting the C-shaped ring (201) into the gap portion (16). The movement toward the (11) side is prevented, and the front end (14) of the movable cylinder portion (12) remains in contact with the rear surface (24) of the large diameter portion (21) of the advance / retreat ring (2). Thereby, the movement of the advance / retreat ring (2) in the backward direction is prevented, and the advance / retreat ring (2) is maintained in the state of being held in the advanced state.

Further, the C-shaped ring (201) is connected to the annular fixing member (25) to be mounted on the pipe connecting portion (46) via the connecting band (26), as in the first embodiment. The configuration.
FIG. 3 is an explanatory diagram of the third embodiment, and this also moves the outer cylinder (1) with the fixed cylinder portion (11) in the same manner as in the second embodiment. It is divided into the cylindrical part (12), and the fixed cylindrical part (11) is provided with a male screw (11a), and the movable cylindrical part (12) is provided with a female screw (12a). It is possible.

  When the movable tube portion (12) is rotated in the tightening direction, the rear surface (13) of the movable tube portion (12) and the opposed surface (15) of the fixed tube portion (11) are brought into close contact, and the fixed tube portion (11). By rotating the moving cylinder part (12) in the direction of loosening the screw, the rear surface (13) of the moving cylinder part (12) moves away from the opposing surface (15) of the fixed cylinder part (11). The tubular portion (12) can be moved in the advance direction, and the advanced state is maintained unless the movable tubular portion (12) is rotated. Therefore, until the front surface (14) of the movable tube portion (12) contacts the rear surface (24) of the large diameter portion (21) of the advance / retreat ring (2) in the advanced state, the fixed tube portion (11) and the movable tube portion If the screwed state with the part (12) is loosened, the advanced state of the advance / retreat ring (2) is maintained by the movable cylinder part (12). That is, in this embodiment, the movable cylinder portion (12) can function as the advance state holding means.

  FIG. 4 is an explanatory diagram of the fourth embodiment, and this also, like the second and third embodiments, attaches the outer cylinder (1) to the fixed cylinder portion ( 11) and a movable cylinder part (12) .The fixed cylinder part (11) is formed with a cam groove (11b), and the cam is located at a predetermined position on the inner surface of the movable cylinder part (12). A pin (12b) that moves in the groove (11b) is projected to form a cylindrical cam structure between the fixed cylinder part (11) and the movable cylinder part (12).

In this case, by rotating the movable cylinder part (12), the pin (12b) moves in the cam groove (11b), and the movable cylinder part (12) can be moved in the forward and backward directions.
Rotate the moving outer cylinder (12) until the final moving state where the front surface (14) of the moving cylinder part (12) abuts the rear surface (24) of the large diameter part (21) of the advancing and retracting ring (2) in the advanced state It is assumed that the engagement protrusion (17) with which the pin (12b) engages protrudes into the cam groove (11b) when being moved. If the pin (12b) is forcibly rotated until it exceeds the engaging protrusion (17), the pin (12b) will be engaged with the engaging protrusion (17), and the moving cylinder part (12) will end. Since the moving state is maintained, the moving cylinder part (12) is not carelessly rotated in the reverse direction and separated from the large diameter part (21).
In the third and fourth embodiments, the advance state holding means is provided at the rear end of (4) and can be moved in the forward / backward direction only by rotating (12). Therefore, it can be used not only for the exposed type gas stopper (31) as shown in FIG. 5, but also for an embedded type gas stopper such as a box cock.

Sectional drawing which shows the use condition of the socket for gas pipe connection of 1st Embodiment. Sectional drawing which shows the use condition of the socket for gas pipe connection of 2nd Embodiment. Sectional drawing which shows the use condition of the socket for gas pipe connection of 3rd Embodiment. Sectional drawing of the socket for gas pipe connection of 4th Embodiment. Explanatory drawing of the conventional socket for gas pipe connection. Explanatory drawing which shows the state which connected the conventional socket for gas pipe connection to the gas stopper.

Explanation of symbols

(1) ・ ・ ・ ・ ・ ・ ・ ・ Outer cylinder
(10) ... Open end
(3) ... Plug part
(43) ... Holding cylinder
(2) ・ ・ ・ ・ ・ ・ ・ ・ Advance / Retreat Ring
(20) ..... Advance state holding means (C-shaped ring)
(21) ... Large diameter part
(22) ... Small diameter part

Claims (6)

It consists of a holding cylinder having a connecting mechanism in which the plug part is detachable, a large-diameter part that is externally fitted to the holding cylinder so as to be able to advance and retreat and projects to the front end, and a subsequent small-diameter part. An advancing / retracting ring that is biased, and an outer cylinder that is externally fitted to the small diameter portion of the advancing / retreating ring,
When the plug part is not connected, the advance / retreat ring is held in the advancement preventing state,
When the plug cylinder is connected to the holding cylinder, the advancement blocking state is released, and the advance / retreat ring is urged in the advancement direction so that the large diameter part and the small diameter part that follows the open part are opened. Maintained in the advanced state protruding a predetermined distance from the end,
In the socket for connecting a gas pipe, the connection of the plug part is released when the forward and backward ring is pushed back in the backward direction.
A socket for connecting a gas pipe, wherein an advancing state holding means for holding the advancing / retreating ring in the advancing state is provided in the outer cylinder or the advancing / retreating ring.   2. The gas pipe connection socket according to claim 1, wherein the advancing state holding means is a width that substantially matches a distance from an open end of the outer cylinder to a rear surface of the large-diameter portion of the advancing / retreating ring that is in the advancing state. And a C-shaped ring that can be tightly fitted to the small diameter portion exposed from the outer cylinder. 2. The gas pipe connection socket according to claim 1, wherein the outer cylinder is freely movable in the advancing direction of the advancing and retracting ring, and a fixed outer cylinder fixed to the holding cylinder on a rear end side of the holding cylinder. Divided into movable outer cylinders,
The moving outer cylinder is moved in the advancing direction, and when the front end thereof is brought into contact with the rear surface of the large-diameter portion of the advance / retreat ring in the advanced state, the moving outer cylinder faces the rear end of the moving outer cylinder. A gap is formed between the fixed outer cylinder and the opposing surface.
A gas pipe connection socket characterized in that a C-shaped ring having a width substantially coinciding with the gap portion and capable of being closely fitted to the gap portion is provided as the advance state holding means.   4. The gas pipe connection socket according to claim 2, wherein an annular fixing member is attached to a pipe connection portion extending rearward of the holding cylinder, and a connecting band is attached to the annular fixing member. The gas pipe connecting socket is characterized in that the C-shaped ring is connected. 2. The gas pipe connection socket according to claim 1, wherein the outer cylinder is freely movable in the advancing direction of the advancing and retracting ring, and a fixed outer cylinder fixed to the holding cylinder on a rear end side of the holding cylinder. Divided into movable outer cylinders,
As the advance state holding means, the fixed outer cylinder and the movable outer cylinder are provided with screw parts that can be screwed together,
By loosening the threaded portion of the movable outer cylinder with respect to the threaded portion of the fixed outer cylinder, the front end of the movable outer cylinder comes into contact with the rear surface of the large-diameter portion of the advancing and retracting ring in the advanced state. Gas pipe connection socket characterized by being movable to 2. The gas pipe connection socket according to claim 1, wherein the outer cylinder is movable in the advancing direction of the advancing and retracting ring, and a fixed outer cylinder fixed to the holding cylinder on a rear end side of the holding cylinder. Divided into a moving outer cylinder,
As the advance state holding means, a cylindrical cam structure is provided on the fixed outer cylinder and the movable outer cylinder,
By rotating the movable outer cylinder by a predetermined angle with respect to the fixed outer cylinder, the movable outer cylinder can move until its front end abuts on the rear surface of the large-diameter portion of the advance / retreat ring in the advanced state. age,
The gas pipe connection socket is provided with an engagement member that engages with each other to prevent reverse rotation of the movable outer cylinder when the movable outer cylinder is rotated to a final movement state.

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