JP3681667B2 - Flexible pipe joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flexible pipe joint, and more particularly to a flexible pipe joint of a type in which a flexible pipe is connected with one touch.
[0002]
[Prior art]
JP-A-2001-99374 is disclosed as this type of flexible pipe joint.
As shown in FIG. 7, this has an annular shape in a tubular joint body (4) in which an inner thread portion (40) is formed at one end and an outer thread portion (41) is formed at the other end. The seal material (42) and the retainer (43) are accommodated in order, and after these are accommodated, the fastening tube (5) is connected to the external thread portion (50) formed at one end thereof by the joint body. It is configured to be mounted and fixed by being screwed into the inner screw portion (40) of (4).
[0003]
The joint body (4) is made of a metal such as brass, and can be coupled to the gas plug body by screwing the outer screw portion (41) into a gas inlet portion such as a gas plug. The retainer (43) is an annular body formed from a metal material such as brass so that it can be expanded and contracted, and a convex part (44) having a taper part whose diameter decreases toward the tip is formed in an annular shape on the inner peripheral surface thereof. Has been. Further, a cylindrical portion (51) having a diameter larger than that of the external thread portion (50) is formed on the other end side of the tightening tube (5), and the cylindrical portion (51) is rotated in the screwing direction. By doing so, the outer thread portion (50) is screwed into the inner thread portion (40) of the joint body (4). Thus, by integrally assembling the joint body (4), the retainer (43), and the fastening cylinder (5), a gas inlet such as a gas stopper, and a bellows pipe (6 ) Can be made to function as a joint.
[0004]
The bellows tube (6) has a peak portion (6a) and a valley portion (6b), and is inserted from the open end of the cylindrical portion (51) of the fastening tube (5). The portion excluding the predetermined range on the insertion end side is covered with a resin cover (60). The inner diameter of the convex portion (44) of the retainer (43) is set smaller than the outer diameter of the peak portion (6a) in the bellows tube (6) and larger than the outer diameter of the valley portion (6b). .
[0005]
When the insertion end portion of the bellows tube (6) is inserted from the open end of the tightening tube (5), the peak portion (6a) at the tip of the bellows tube (6) becomes the convex portion (44) of the retainer (43). At this time, the sealing material (42) is pushed into the inner end of the joint body (4) through the retainer (43). From this state, when the bellows tube (6) is further pushed in, the retainer (43) expands the diameter of the bellows tube (6) by pressing the tapered portion against the peak portion (6a) of the bellows tube (6). Some of the peaks (6a) on the insertion end side pass through the convex portion (44) of the retainer (43). The crest (6a) that has passed is sent to the back while closely contacting the inner surface of the sealing material (42), the tip of the bellows tube (6) abuts the back end surface of the joint body (4), and the retainer (43) The insertion is stopped in a state where the convex portion (44) is engaged in one way with one of the valley portions (6b) of the bellows tube (6). This state is a state in which the bellows tube (6) is connected to the joint.
[0006]
When a force in the direction pulled out from the joint is applied to the connected bellows tube (6), the convex portion (44) of the retainer (43) in one of the valley portions (6b) of the bellows tube (6). The retainer (43) is moved in the pulling direction together with the bellows tube (6) in a state in which is fitted. Then, the taper outer surface (45) provided on the outer periphery of the retainer (43) hits the taper inner surface (52) provided on the inner surface of the front end of the fastening cylinder (5), and the retainer (43) is not pulled out any further. On the upper side, a reaction force inward in the radial direction is received from the fastening tube (5). Due to the reaction force, the convex portion (44) of the retainer (43) presses the outer periphery of the trough (6b) over the entire circumference, and the engagement of the retainer (43) with the bellows tube (6) is ensured. It will be something. As a result, the bellows tube (6) does not fall out of the joint even when a force drawn from the joint is applied to the connected bellows tube (6).
[0007]
[Problems to be solved by the invention]
In this conventional one, the bellows tube (6) is forced from the open end of the tightening tube (5) to the joint in which the joint body (4), the retainer (43) and the tightening tube (5) are assembled in advance. It is possible to connect the bellows pipe (6) to the joint with a single touch and keep it in a state of being prevented from being detached, so that the bellows pipe (6) can be easily connected to the joint. It is easy to use.
[0008]
However, in the conventional flexible pipe joint configured as described above, in order to screw the outer thread portion (50) of the tightening tube (5) to the inner thread portion (40) of the joint body (4), the tightening tube ( The cylindrical portion (51) of 5) is protruded from the joint body (4). For this reason, in use, there is a possibility that the cylindrical portion (51) may be rotated in the direction opposite to the tightening direction due to excessive or mischief. When the cylindrical part (51) is rotated in the direction opposite to the tightening direction and the tightening degree of the tightening cylinder (5) with respect to the joint body (4) is loosened, the connection of the bellows pipe (6) becomes unstable. The problem arises. Furthermore, if the tightening tube (5) is inadvertently removed, the bellows tube (6) cannot be retained in the joint body (4) by the retainer (43). It is a danger.
[0009]
The present invention is “a cylindrical joint body in which an internal thread portion is formed,
An outer threaded portion that can be screwed to the inner threaded portion, and a fastening cylinder that is threaded from one end of the joint body;
A retainer that is an expandable / contractable annular body that is positioned forward in the screwing direction of the tightening tube and that holds the flexible tube inserted into the joint body from the rear end of the tightening tube in a retaining state; An object of the present invention is to prevent the flexible pipe joint from being easily disassembled after assembly.
<1>
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the solution means of the invention is as follows: "The fastening cylinder holds the retainer in a state of being prevented from coming off in a final tightened state, and the whole of the fastening cylinder is the joint body. It is set so that the rear end of the tightening cylinder is not exposed from the open end of the joint body .
The fastening tube is configured as a separate body of a first metal tube portion screwed first and a second resin tube portion housed from the rear of the first tube portion, and the second tube portion. It is assumed that the packing portion projects in an annular shape on the inner surface of the cylindrical portion, and the external thread portion provided in the fastening cylinder is formed at least in the first cylindrical portion .
[0011]
The above solution works as follows.
When the fastening cylinder is screwed into the joint body after the retainer is accommodated, the fastening cylinder moves forward in the joint body while pushing the retainer at the front end, and in the final tightened state, The whole tightening cylinder is housed in the joint body. That is, in the assembled state, the rear end portion of the tightening cylinder is not exposed from the open end of the joint body.
[0012]
In this case, it is assumed that the outer thread portion provided in the tightening cylinder is formed at least in the first cylinder portion, and in this case, the inner thread portion formed in the joint body is screwed at least with the first cylinder portion. It suffices if it is formed in the central portion. Then, previously, the first cylindrical portion Toe screwed into the joint body, from the rear, is inserted in a state retaining the second barrel portion. In the case where only the first tube portion is set to be accommodated in a screwed state, the second tube portion only needs to be set so as to be pressed tightly into the joint body. Thus, when the 1st cylinder part and the 2nd cylinder part are constituted separately, even if the insertion degree of the 2nd cylinder part may loosen, it does not affect the 1st cylinder part. . Therefore, the final tightened state of the first tube part can be maintained regardless of the degree of insertion of the second tube part.
[0013]
Further, the outer periphery of the flexible tube inserted into the joint body is covered with a cover made of synthetic resin, and when the flexible tube is inserted from the open end of the second tube portion, the outer peripheral surface of the cover Will be in contact with the packing portion provided on the inner peripheral surface of the second cylindrical portion.
[0014]
< Item 2 >
In the invention described in detail in 1 above, in the case where “a retaining ring for retaining the fastening tube in a retaining state is provided in the vicinity of the one end of the joint body”, the retaining ring The fastening cylinder cannot be pulled out from the joint body unless is removed.
[0015]
< Section 3 >
In the invention described in detail in each of the above items, “the other end of the joint main body is connected to the other end of the gas plug main body in which the hose end portion protrudes at one end”, the gas inlet portion of the gas plug Can function as a flexible pipe joint.
[0016]
【The invention's effect】
Since the tightening cylinder is set so as not to be exposed from the joint body when the joint is assembled, the tightening degree cannot be loosened unless a special tool is used. In other words, since the joint once assembled is not easily disassembled, the connection state of the flexible tube inserted into the joint is reliably maintained in a retaining state and becomes stable.
[0017]
In addition, since the second cylinder part constituting the rear area of the fastening cylinder is made of resin and the packing part is provided on the inner peripheral surface thereof, rainwater or the like into the joint body is provided in the fastening cylinder. There is no need to attach a seal packing to prevent intrusion. Therefore, since the number of parts is reduced, there is an effect that the assembling work becomes easier. Further, when the first and second cylinder parts are separate from each other, the tightening state of the first cylinder part can be maintained more reliably.
[0018]
According to the second aspect , the tightening cylinder can be reliably maintained in the retaining state, so that the degree of screwing of the tightening cylinder with respect to the joint body can be more reliably maintained.
[0019]
According to the third aspect , when a gas pipe is connected to the gas plug, it is possible to eliminate the trouble of attaching a joint to the gas inlet of the gas plug, so that it is possible to provide a user-friendly gas plug.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, in the flexible pipe joint according to the embodiment of the present invention, the hose end portion (102) projects at a right angle with respect to the upstream cylindrical portion (10) through which the gas is sent. A gas fitting (100) of the type, which is used by being coupled to the upstream end of the upstream cylindrical portion (10), and a tubular joint body (1) having one end directly coupled to the upstream end; A tightening tube (2) screwed from the opening on the other end side of the joint body (1), and the other end of the joint body (1) in the joint body (1) rather than the tightening tube (2) And a retainer (3) located on the side.
The joint body (1), the fastening cylinder (2) and the retainer (3) are made of a metal material such as brass or brass.
[0021]
First, the joint body (1) will be described.
The one end of the joint body (1) is formed with a cylinder part (15) for external fitting to the open end of the upstream cylinder part (10), and the cylinder part (15) is connected to the joint body ( By coupling the open end of 1) in an airtight state via an O-ring (101), the joint body (1) and the gas stopper (100) are integrated.
[0022]
An annular flange body (12) protrudes inwardly from the inner surface of the base end portion of the tube portion (15), and the both sides of the flange body (12) are on the tube portion (15) side. The surface is set so as to come into contact with the open end of the upstream side cylinder portion (10), and the back surface thereof is inserted from the open portion side of the joint body (1) as shown in FIG. It will function as a tube receiving surface (16) that receives the tip (insertion end) of the bellows tube (6) as a gas pipe.
[0023]
From the inner peripheral end of the flange body (12), a cylindrical insertion body (13) inserted into the distal end portion of the bellows tube (6) is formed extending along the axis of the joint body (1). .
[0024]
An annular space between the insertion body (13) and the inner peripheral surface of the joint body (1) serves as a seal material accommodation portion (18) in which a rubber seal material (300) is accommodated. The sealing material (300) is an annular fireproof expansion packing (31) positioned on the side close to the flange body (12), and a cylindrical shape integrally coupled to the rear end portion of the fireproof expansion packing (31). It consists of a seal rubber part (32), and the fireproof expansion packing (31) is made of a relatively hard material having fire resistance, and the seal rubber part (32) is soft and sealable, although it has no fire resistance. It is made of a material with excellent performance.
[0025]
Further, an annular groove (17) is formed on the inner peripheral surface of the joint body (1) in the vicinity of the opening, and the seal material accommodating part (18) is formed from the peripheral edge on the back side of the annular groove (17). It is assumed that an inner screw portion (11) is formed in a predetermined range leading to). Incidentally, the inner diameter of the joint body (1) in the range where the inner thread portion (11) is formed is set larger than the inner diameter of the seal material accommodating portion (18), and the inner thread portion (11) formation region And a stepped portion (19) is provided at a boundary portion between the sealing material accommodating portion (18) and the sealing material accommodating portion (18).
[0026]
Next, the tightening cylinder (2) will be described.
The fastening cylinder (2) is made of a synthetic resin that is separated from the metal first cylinder part (21) and the first cylinder part (21) and is accommodated in the joint body (1) after this. The second cylinder portion (22).
[0027]
The inner peripheral surface that continues to the front end surface side that is the front end in the insertion direction of the first tube portion (21) is a tapered inner surface (20) that increases in diameter toward the front end surface. A tool engaging groove (21a) is formed along one of the diameter lines. An outer thread portion (23a) that can be screwed into the inner thread portion (11) of the joint body (1) is formed on the outer peripheral surface of the first tube portion (21).
[0028]
The second cylinder part (22) is a resin-made annular body, and an outer screw part (23b) is formed on the outer peripheral surface of the second cylinder part (22b) so as to follow the outer screw part (23a) of the first cylinder part (21). The front end surface is in contact with the rear end surface where the groove portion (21a) of the first tube portion (21) is formed, and the rear end surface has a groove portion (22a) similar to the groove portion (21a). Is formed. An annular projection that functions as an annular packing (24) for sealing projects integrally inward at a predetermined position on the inner peripheral surface near the rear end surface of the second cylindrical portion (22). This annular packing (24) contacts the outer peripheral surface of the synthetic resin cladding tube (60) that covers the outer periphery of the bellows tube (6), and prevents intrusion of rainwater and the like into the joint body (1). Is for the purpose.
[0029]
Incidentally, the total length of the continuous outer thread portions (23a) (23b) of the tightening cylinder (2) is set to be equal to or less than the length of the inner thread portion (11) of the joint body (1), The first tube portion (21) is tightened until the tip end portion of the outer screw portion (23a) reaches the step portion (19) in front of the inner screw portion (11), and the second tube portion is in contact with the rear end portion. In the state in which (22) is tightened, the entire tightening cylinder (2) is accommodated in the joint body (1), and an annular groove (17) is formed behind the second cylinder (22). It becomes an aspect. This state is a state in which the tightening cylinder (2) is tightened until it reaches the final tightening position in the joint body (1).
[0030]
Finally, the retainer (3) will be described.
The retainer (3) is a cylindrical body having a substantially C-shaped cross section in which a single slit is formed in the axial direction and is expandable / contractible in the radial direction. The retainer (3) It is provided so as to be positioned between the first tube portion (21) and the seal rubber portion (32).
[0031]
The outer peripheral edge of the rear end portion of the retainer (3) is formed with a tapered outer peripheral edge (30) whose diameter decreases toward the rear, and the degree of taper of the tapered outer peripheral surface (30) is the first cylindrical portion ( It is made to correspond to that of the taper inner surface (20) of 21).
[0032]
The inner edge of the front end portion of the retainer (3) is formed so as to project inwardly in a tapered shape, thereby forming a biting portion (33). The inner diameter of the biting portion (33) is set to be smaller than the outer diameter of the peak portion (6a) of the bellows tube (6) in a free state where it is not expanded or contracted and slightly larger than the outer diameter of the valley portion (6b).
[0033]
To assemble this flexible pipe joint, first, from the open end side where the annular groove part (17) of the joint body (1) is formed, a sealing material comprising a fireproof expansion packing (31) and a seal rubber part (32) ( 300) is pushed into the joint body (1) so that the fireproof expansion packing (31) is located on the flange body (12) side. At this time, it is not necessary to push in until the fireproof expansion packing (31) comes into contact with the pipe receiving surface (16) of the flange body (12).
[0034]
Then, in a state where the tapered outer peripheral edge (30) of the retainer (3) is in contact with the tapered inner surface (20) of the first cylindrical part (21) of the tightening cylinder (2), the first cylindrical part. Screw (21) into the joint body (1). By inserting a plate-like tool into the groove portion (21a) formed on the rear end surface of the first tube portion (21) and turning it, the outer screw portion (23a) of the first tube portion (21) becomes the joint body. It can be screwed into the inner threaded portion (11) of (1), and the first tube portion (21) advances deeper in the joint body (1). When the first tube portion (21) is screwed into the joint body (1), the retainer (3) is pushed by the first tube portion (21) and moved to the back inside the joint body (1). The seal material (300) is pushed into the seal material accommodating portion (18) by being pushed by the retainer (3).
[0035]
The first tube portion (21) is advanced deeply into the joint body (1) in the manner described above by tightening, but when the front end reaches the step portion (19), it is screwed further. Is blocked. At that time, since there is a response, it can be seen that the first tube portion (21) has reached the final tightening position.
Thereafter, the second cylinder portion (22) is screwed into the joint body (1) in the same manner.
[0036]
The length of the inner thread part (11) provided in the joint body (1) is the length of the outer thread part (23a) (23b) provided in the first cylinder part (21) and the second cylinder part (22). In the state where the second tube portion (22) is tightened until the front end surface of the second tube portion (22) contacts the rear end surface of the first tube portion (21). The second tube portion (22) is entirely accommodated in the joint body (1), and the annular groove (17) of the joint body (1) is formed in the rear region from the rear end portion. It becomes an aspect. Then, a retaining ring (14) such as a C-shaped ring is fitted into the annular groove (17) to complete the assembly of the joint.
[0037]
The bellows pipe (6) as the flexible gas pipe has a configuration in which it is covered with a resin cover (60) except for a predetermined range on the insertion end side, and the flexible gas pipe is assembled as described above. It is inserted into the pipe joint from the rear of the tightening tube (2). Then, as shown in FIG. 2, after the foremost peak portion (6a) of the bellows tube (6) abuts against the biting portion (33) of the retainer (3) from the rear, the state is maintained in that state as shown in FIG. As shown in FIG. 3, the retainer (3) and the sealing material (300) are connected to the front end portion of the sealing material accommodating portion (18), that is, the gas stopper (100) side of the front end of the fireproof expansion packing (31). The joint body (1) is pushed in until it comes into contact with the tube receiving surface (16) on the back side of the flange body (12) formed on the inner surface of the joint body (1).
[0038]
From this state, when the bellows tube (6) is pushed more strongly, the retainer (3) is forced to expand by being pushed by the peak (6a), and as shown by the two-dot chain line in the figure, Several crests (6a) located at the front end portion of the pipe (6) pass between the biting parts (33), and are externally fitted to the support (13) in the joint body (1). It is pushed into the accommodating part (18). When the tip of the bellows tube (6) contacts the tube receiving surface (16) of the joint body (1) and further insertion is prevented, the retainer (3) is in the free state by its elastic return force. The biting part (33) bites into the valley part (6b) at the corresponding position. This is the connection completion state of the bellows tube (6), and each peak portion (6a) of the bellows tube (6) in the state of being accommodated in the seal material accommodating portion (18) is fireproof of the seal material (300). The bellows tube (6) is kept in an airtight state in the joint body (1) because it comes into close contact with the inner surfaces of the expansion packing (31) and the seal rubber portion (32). In addition, the outer surface of the covering (60) of the bellows tube (6) is in close contact with the annular packing (24) provided in the second cylindrical portion (22), so that rainwater and dust are contained in the joint body (1). Etc. will be prevented from entering.
[0039]
In this connected state, as shown by the arrow in FIG. 4, when a pulling force is applied to the bellows tube (6), the back side of the valley (6b) into which the biting portion (33) is fitted The crest portion (6a) following the abutment comes into contact with the biting portion (33) and pushes the retainer (3) toward the open portion of the joint body (1).
[0040]
The retainer (3) is pushed by the bellows tube (6) and moved in the pulling direction, but the tapered outer periphery (30) of the retainer (3) has reached the tapered inner surface (20) of the tightening cylinder (2). At that point, the movement is blocked. The fastening cylinder (2) does not move in the joint body (1) unless the second cylinder part (22) and the first cylinder part (21) are loosened, and the outer periphery of the fastening cylinder (2) 30) is pressed against the taper inner surface (20), so that the retainer (3) is not pushed any further, and the inner tube is opposite from the first tube portion (21) of the tightening tube (2). You will receive power. The reaction force causes the biting portion (33) of the retainer (3) to deeply bite into the valley portion (6b) over the entire circumference, and the bellows tube (6) is prevented from being pulled out further.
[0041]
In this state, the outer surface of each peak portion (6a) of the bellows tube (6) located behind the biting portion (33) of the retainer (3) remains in close contact with the sealing material (300). Therefore, even if the bellows tube (6) is inadvertently pulled in the pulling direction, there is no inconvenience that gas leaks.
[0042]
In addition, even if the screwing of the tightening cylinder (21) may be loosened carelessly, it will not come off in the vicinity of the open end of the joint body (1) behind the second cylinder part (22). Since the ring (14) is fitted, the second tube portion (21) does not fall out of the joint body (1). Even if there is an inconvenience that the retaining ring (14) comes off and the second cylinder part (21) falls off the joint body (1), it is configured separately from the second cylinder part (22). The first cylinder portion (21) can be kept in the screwed state at the final tightening position regardless of whether the second cylinder portion (22) is loosened or dropped off, so that the retainer (3) is prevented from coming off. It can be held in a state.
[0043]
In the above embodiment, the inner thread portion (11) is formed over the entire area of the first cylindrical portion (21) in the joint body (1). However, as shown in FIG. The inner threaded portion (11) is formed only at the central portion of the joint body (1) to which the first metal tubular portion (21) is screwed, and the inner portion is not provided with an inner thread on the open side. It is good also as a shape part (25). In this case, it is not necessary to provide the external threaded portion on the resin-made second cylindrical portion (22), and the outer diameter thereof is set to be substantially the same as or slightly larger than the inner diameter of the cylindrical portion (25). . As a result, if the first cylindrical portion (21) is forcibly fitted into the cylindrical portion (25) after the first cylindrical portion (21) is fastened to the inner screw portion (11), the second cylindrical portion (22) is prevented from coming off. It can be accommodated in a state.
[0044]
Although not related to the present invention , the tightening cylinder (2) may be configured to integrally connect the first cylinder part (21) and the second cylinder part (22). In this case, it is not necessary to provide the groove portion (21a) on the rear end surface of the first tube portion (21). Further, as shown in FIG. 6, the entire fastening cylinder (2) may be made of metal. In this case, a groove (26) may be formed in an annular shape on the inner peripheral surface near the rear end, and a sealing annular packing (27) may be fitted in the groove (26).
[0045]
In each of the above embodiments, the tubular portion (15) of the joint body (1) is configured to be attached to the gas stopper (100) including the hose end portion (102). Needless to say, it can also be used by being attached to a gas inlet of a gas plug of the type that includes a knob portion and a stopper that opens and closes the gas passage.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state in which a flexible pipe joint in an embodiment of the present invention is connected to a gas stopper.
FIG. 2 is a cross-sectional view showing a state in which a bellows tube is inserted shallowly into the flexible pipe joint in the embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a state in which the bellows tube is inserted deeply into the flexible pipe joint according to the embodiment of the present invention, and a two-dot chain line portion shows a connection completion state of the bellows tube.
FIG. 4 is a cross-sectional view showing a state in which a pulling direction force is applied to the bellows tube in a state connected to the flexible pipe joint in the embodiment of the present invention.
FIG. 5 is a sectional view showing another example of the flexible pipe joint in the embodiment of the present invention.
FIG. 6 is a cross-sectional view showing another example of the flexible pipe joint according to the embodiment of the present invention.
FIG. 7 is an explanatory view of a conventional flexible pipe joint.
[Explanation of symbols]
(1) ... Fitting body
(11) ・ ・ ・ ・ ・ Inner thread
(2) ... Tightening cylinder
(21) (22) ・ ・ ・ External thread
(3) ・ ・ ・ ・ ・ Retainer
(6) ・ ・ ・ ・ ・ Flexible tube

Claims (3)

A cylindrical joint body in which an internal thread is formed;
An outer threaded portion that can be screwed to the inner threaded portion, and a fastening cylinder that is threaded from one end of the joint body;
A retainer that is an expandable / contractable annular body that is positioned forward in the screwing direction of the tightening tube and that holds the flexible tube inserted into the joint body from the rear end of the tightening tube in a retaining state; In a flexible pipe joint consisting of
The tightening tube retains the retainer in a state in which the retainer is prevented from coming off in a final tightened state, and the entire tightening tube is accommodated in the joint body, and a rear end portion of the tightening tube is open to the joint body. It is set not to be exposed from the edge ,
The fastening tube is configured as a separate body of a first metal tube portion screwed first and a second resin tube portion housed from the rear of the first tube portion, and the second tube portion. A flexible pipe joint in which a packing part projects in an annular shape on the inner surface of the cylinder part, and an external thread part provided in the fastening cylinder is formed at least in the first cylinder part . The flexible pipe joint according to claim 1 , wherein a retaining ring for holding the fastening tube in a retaining state is provided near the one end of the joint body. The flexible pipe joint according to claim 1 or 2 , wherein the other end of the joint body is connected to the other end of a gas plug body of a type in which a hose end portion projects from one end.

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