JP2015025522A - Socket and pipe joint having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a socket that enables stable attachment/detachment with a simple structure, and a pipe joint having the same.SOLUTION: A socket 10 according to the present invention mainly comprises: a base part 18; steel balls 22, 24 housed in a housing hole of the base part 18; an outer support part 26 supporting the steel ball 22 and the like from outside; and an inner support part 25 supporting the steel ball 22 and the like from inside. Under an insertion state, a diameter-enlargement part 42 of a plug 12 is fitted with the steel ball 22 arranged at a tip side of the base part 18. Under a semi-insertion state, the steel ball 22 moves outward in a radial direction, and fitting of the diameter-enlargement part 42 and the steel ball 22 is cancelled, and the steel ball 24 on a rear end side is fitted with the diameter-enlargement part 42. Under a non-connection state, the steel ball 24 moves outward in the radial direction, and fitting with the diameter-enlargement part 42 is cancelled and the plug 12 is pulled out of the socket 10.

Description

  The present invention relates to a socket interposed in a path through which compressed air flows and a pipe joint having the socket.

  Generally, a socket is provided at an air supply port of an air compressor for supplying compressed air to a nailer driven by compressed air, and a plug is provided at one end of a hose connected to the socket of the air supply port. Is provided. Also, a socket is provided at the other end of the hose, and a plug is provided at a portion of a so-called pneumatic tool that is driven by compressed air such as a nailing machine connected to the socket at the other end of the hose. ing. Compressed air can be supplied from the air supply port of the air compressor into the hose by inserting and fixing the plugs to the sockets. A general socket or plug is described in, for example, Patent Document 1 below.

  Moreover, the structure for simplifying the connection of a plug and a socket is described in the following patent documents 2 and patent documents 3.

  In Cited Document 2, as shown in FIG. 1 and the like, the small outer diameter cylindrical portion 3a of the socket body 3 has a plurality of lock ball fitting holes 8 formed in the circumferential direction. Each of the fitting holes 8 is a long hole that is long in the axial direction, and some of the lock ball fitting holes 8a are longer than the other lock ball fitting holes 8b. .

  In Cited Document 3, referring to FIG. 1 and the like, a lock sleeve 3 is disposed inside the cylindrical socket body 1, and a cutout portion 32 is disposed on the extension line of the ball stopper piece 31 in the lock sleeve 3. The When connecting the cylindrical socket body 1 and the plug 7, the lock ball 2 enters between the ball stopper piece 31 and the ball pressing piece 41 in the notch 32.

JP 2000-55272 A JP 2001-14695 A JP 2012-31956 A

  Referring to FIG. 1 of the cited document 2, it is necessary to form the fitting hole 8a for accommodating the lock ball used for fitting with the socket in an elongated shape along the axial direction. However, it is not easy to form such a fitting hole 8a by excavation, and there is a problem that the processing time becomes long.

  Further, referring to FIG. 1 and the like of the cited document 3, an elongated notch 32 for accommodating the lock ball 2 is formed. By providing such a notch 32, the mechanical mechanism of the lock sleeve 3 is provided. There was a problem that the strength decreased.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a socket capable of stable attachment and detachment with a simple configuration and a pipe joint having the socket.

  The socket according to the present invention includes a base portion having a substantially cylindrical shape, a valve body housed in the base portion, a plurality of first steel balls housed in first housing holes provided through the base portion, and the first A plurality of second steel balls, which are accommodated in a second accommodation hole penetrating the base portion, on the rear end side of the one accommodation hole, and support the first steel ball and the second steel ball from the inside. A ring-shaped inner support that is displaceable along the axial direction, and a ring-shaped outer support that supports the first steel ball and the second steel ball from the outside and is displaceable along the axial and rotational directions. A first urging means for applying an urging force to the valve body along the axial direction, a second urging means for applying an urging force to the inner support portion along the axial direction, and an axial direction and a rotational direction. And a third urging means for applying an urging force to the outer support portion along the plug, and the plug is inserted into an airtight state. In the inserted state, the diameter-enlarged portion of the plug is fitted to the first steel ball disposed radially inward by contacting the first groove provided on the inner surface of the outer support portion, and the plug is In the semi-insertion state that is inserted and becomes non-airtight, the outer support portion is displaced in the rotational direction, and is provided in the second groove deeper than the first groove provided on the inner surface of the outer support portion. The first steel ball is disposed radially outward, the fitting between the first steel ball and the enlarged diameter portion of the plug is released, and the enlarged diameter portion of the plug is fitted with the second steel ball. In the non-insertion state in which the plug is pulled out, the outer support portion is displaced in the axial direction, whereby the first steel ball and the second steel ball are disposed radially outward, and the plug The expanded diameter portion and the second steel ball are disengaged from each other.

  According to this invention, the 1st steel ball for fitting with a plug at the time of insertion is arrange | positioned in the 1st accommodation hole provided in the front end side of the base. Moreover, the 2nd steel ball for fitting with a plug at the time of half insertion is arrange | positioned in the 2nd accommodation hole provided in the rear end side of the base. Therefore, each steel ball is placed in a different storage hole, and no long hole is required. Therefore, the storage hole can be easily formed by cutting, and further, the mechanical strength of the base due to the provision of the storage hole is suppressed. it can.

It is a perspective view which shows the pipe joint of this invention. It is a figure which shows the pipe joint of this invention, (A) is a top view which shows a pipe joint, (B) is sectional drawing. It is a figure which shows the outer side support part which comprises the pipe joint of this invention, (A) is a perspective view which shows an outer side support part, (B) is sectional drawing in alignment with the axial direction, (C) and ( D) is a cross-sectional view along the circumferential direction. (A) is a disassembled perspective view which shows the socket of this invention, (B) is sectional drawing in alignment with the axial direction of a pipe joint. It is a disassembled perspective view which shows the socket of this invention. It is a figure which shows the pipe joint of this invention, (A) is a top view which shows a pipe joint, (B) is sectional drawing of an axial direction, (C) And (D) is sectional drawing of the circumferential direction It is. It is a figure which shows the pipe joint of this invention, (A) is a top view which shows a pipe joint, (B) is sectional drawing.

  With reference to FIG. 1, the structure of the pipe joint 14 which concerns on this form is demonstrated. The pipe joint 14 of this embodiment includes a socket 10 and a plug 12 inserted into the socket 10, and the pipe joint 14 is configured by inserting the plug 12 into the socket 10. The role of the pipe joint 14 is to be installed in a hose that connects a compressed air generating device such as a compressor and a compressed air using device such as a nail driver, and is detachable. Under use conditions, the compressed air flows from the socket 10 to the plug 12. Here, the plug may be referred to as a male joint member, and the socket may be referred to as a female joint member.

  As for the state of the pipe joint 14, an insertion state in which the plug 12 is inserted into the socket 10 to be in an airtight state, a semi-insertion state in which the plug 12 is in a non-airtight state in the inserted state, and the plug 12 is pulled out from the socket 10. There is a non-insertion state. This figure shows a non-inserted state in which the plug 12 is pulled out of the socket 10.

  A method for shifting the pipe joint 14 from the non-insertion state to the insertion state is as follows. The plug 12 is inserted into the socket 10, and the diameter-enlarged portion 42 of the plug 12 is fitted into a steel ball disposed on the rear end side inside the socket 10, so that the semi-inserted state is achieved. When in the half-inserted state, the outer support portion 26 of the socket 10 moves to the rear end side. When the plug 12 is further inserted into the socket 10 in this state, an insertion state is realized in which the diameter-expanded portion 42 of the plug 12 is fitted to another steel ball disposed on the distal end side inside the socket 10 and becomes airtight. The At this time, the outer support portion 26 of the socket rotates counterclockwise as viewed from the front end side.

  The method for shifting from the inserted state to the non-inserted state is as follows. When the outer support portion 26 is rotated by a predetermined angle clockwise when viewed from the distal end side while the base portion 18 of the socket 10 is fixed in the inserted state, the diameter-enlarged portion of the plug 12 from the steel ball on the distal end side incorporated in the socket 10 42 comes off, and the enlarged diameter portion 42 is fitted to the steel ball on the rear end side. Thereby, a semi-insertion state is realized in which the airtight state is released while the state where the plug 12 is inserted into the socket 10 is maintained. Thereafter, the base portion 18 is fixed and the outer support portion 26 is moved to the distal end side, so that the expanded diameter portion 42 of the plug 12 is detached from the steel ball of the socket 10, and the plug 12 is pulled out of the socket 10 and is not inserted. Is realized.

  The details of the pipe joint 14 in the inserted state will be described with reference to FIG. 2, the half-inserted state will be described with reference to FIG. 6, and the non-inserted state will be described with reference to FIG.

  With reference to FIG. 2, the structure of the pipe joint 14 in an insertion state is demonstrated. 2A is a plan view showing the pipe joint 14 in a state where the plug 12 is inserted into the socket 10, and FIG. 2B is a cross-sectional view of the pipe joint 14 shown in FIG. It is sectional drawing at the time of cut | disconnecting. In FIG. 2B, the cross section showing the socket 10 is shown by sparse hatching, and the cross section showing the plug 12 is shown by dense hatching.

  Referring to FIG. 2B, the socket 10 includes a cylindrical base portion 18, a cylindrical tip base portion 16 inserted into the base portion 18 from the distal end side, and a substantially annular partition wall portion built in the base portion 18. 19, a valve body 30 that is inscribed in the partition wall 19 and closes the air flow path, steel balls 22 and 24 that are accommodated in an accommodation hole that penetrates the base 18, and a steel provided coaxially within the base 18. An inner support portion 25 that supports the balls 22 and 24 from the inside and an outer support portion 26 that is provided coaxially on the outer side of the base portion 18 and supports the steel balls 22 and 24 from the outside are mainly provided.

  The base 18 is made of a cylindrical metal material whose both ends are open, and its inner diameter is slightly larger than the outer diameter of the plug 12. A plurality of storage holes penetrating in the thickness direction are provided on the rear end side of the base 18 along the circumferential direction, and steel balls 22 and 24 made of spherical metal are stored in these storage holes. Here, the steel ball may be referred to as a rock ball.

  The distal end base portion 16 is made of a cylindrical metal material whose both ends are open, and a part thereof is inserted and connected to the distal end side of the base portion 18. The connection between the two is realized by screwing, bonding, or a combination thereof. This connection structure is the same for other members with insertion. Here, the tip base 16 can also be regarded as a part of the base 18.

  The partition wall portion 19 is a ring-shaped member that is inscribed in the base portion 18, and has a role of maintaining the airtightness of the air flow path 38 of the socket 10 together with the valve body 30 under use conditions. The position of the partition wall portion 19 inside the base portion 18 is defined by the end portion on the rear end side of the distal end base portion 16 contacting the partition wall portion 19. In addition, an O-ring is accommodated in the partition wall portion 19, and the outer surface of the plug 12 inserted into the socket 10 comes into contact with the O-ring, so that gas leaks from between the plug 12 and the socket 10 to the outside. It is prevented.

  The valve body 30 has a bottomed cylindrical shape having an open port on the rear end side, and is built in the base portion 18 so that an outer surface thereof abuts against an inner surface of the partition wall portion 19. Further, a plurality of holes 44 penetrating the side wall of the valve body 30 are provided at equal intervals along the circumferential direction, and the air flow path 40 of the plug 12 and the socket 10 are connected via the holes 44. The air flow path 38 is in communication. Further, a spring 28 is provided between the valve body 30 and the inner wall of the front end base portion 16, and this spring 28 generates a biasing force for moving the valve body 30 to the rear end side. In the illustrated insertion state, the valve body 30 pressed by the plug 12 has moved to the distal end side, whereby the hole portion 44 of the valve body 30 is disposed on the distal end side with respect to the partition wall portion 19 and the communication state described above is achieved. Is realized.

  The inner support portion 25 is a substantially ring-shaped metal member coaxially incorporated in the base portion 18 and has a role of supporting the steel balls 22 and 24 stored in the storage holes of the base portion 18 from the inside. The side surface on the rear end side of the inner support portion 25 is an inclined surface that can be brought into surface contact with the enlarged diameter portion 42 of the plug 12. A spring 32 is disposed between the inner support portion 25 and the partition wall portion 19, and this spring 32 generates an urging force for moving the inner support portion 25 to the rear end side. In this inserted state, the inner support portion 25 is moved to the distal end side by the enlarged diameter portion 42 of the plug 12 inserted in the socket 10. Therefore, the inner support portion 25 is not in contact with any of the steel balls 22 and 24. The steel balls 22 and 24 are supported from the inside by the inserted plug 12.

  The outer support portion 26 is a ring-shaped metal member that coaxially covers the base portion 18 from the outside, and has a role of supporting the steel balls 22 and 24 accommodated in the base portion 18 from the outside. A spring 34 is disposed between the base portion 18 and the outer support portion 26, and this spring 34 generates an urging force to move the outer support portion 26 toward the rear end side with respect to the base portion 18. Yes. Further, when the socket 10 is viewed from the distal end side, the spring 34 also generates a biasing force that attempts to rotate the outer support portion 26 counterclockwise with respect to the base portion 18. Here, the outer side support part 26 may be called a sleeve.

  Further, a steel ball 20 for restricting the movement of the outer support portion 26 relative to the base portion 18 is disposed between the end portion on the distal end side of the outer support portion 26 and the base portion 18. The base 18 is provided with a hemispherical groove for accommodating the steel ball 20, and an L-shaped groove for movement restriction is provided on the inner surface of the outer support part 26. Here, the steel ball 20 may be referred to as a rock ball.

  With reference to FIG. 3, the structure of the outer side support part 26 which comprises the above-mentioned socket 10 is demonstrated. 3A is a perspective view showing the outer support portion 26, FIG. 3B is a cross-sectional view when the outer support portion 26 is cut in the axial direction, and FIG. 3C is a circumferential direction. It is sectional drawing at the time of cut | disconnecting the outer side support part 26, FIG.3 (D) is sectional drawing which shows the outer side support part 26 after rotation by the same cross section as FIG.3 (C).

  Referring to FIGS. 3A and 3B, the outer support portion 26 has a substantially ring shape, and has two annular protrusions 45 whose inner walls protrude inwardly in an annular shape. , 47 are provided. The annular protrusion 45 is provided on the tip side of the annular protrusion 47. In the inserted state in which the plug 12 is inserted into the socket 10 (FIG. 2B), the steel ball 22 is supported from the outside by the annular protrusion 45, and the steel ball 24 is supported from the outside by the annular protrusion 47. Yes. Here, the degree to which the annular protrusion 45 and the annular protrusion 47 protrude inward in the radial direction is the same. The length by which the annular protrusions 45 and 47 protrude inward is such that the steel balls 22 and 24 pressed by the ring protrusions 45 and 47 can be fitted to the diameter-expanded portion 42 of the plug 12.

  With reference to FIG.3 (C), the some groove | channel is provided along the axial direction by denting the inner surface of the cyclic | annular convex part 45 partially outside. Specifically, a relatively shallow first groove 46 and a second groove 48 deeper than the first groove 46 are provided. For example, six first grooves 46 are provided at equal intervals in the circumferential direction at locations corresponding to the steel balls 22. Six second grooves 48 are provided at equal intervals in the circumferential direction, for example, at locations corresponding to the steel balls 22 between the first grooves 46. The distance between the adjacent first groove 46 and second groove 48 along the circumference is substantially the same. The 1st groove | channel 46 is a site | part which the steel ball 22 fits in the insertion state shown in FIG. As a result, the positions of the base 18 and the outer support portion 26 with respect to the rotation direction in the inserted state are fixed, and the outer support portion 26 is rotated at an inappropriate timing to prevent the inserted state from being released. ing.

  Referring to FIG. 3D, when the outer support portion 26 is rotated clockwise as viewed from the front end side in the inserted state, the steel ball 22 is removed from the first groove 46 and then the deep second groove. The steel ball 22 moves to the outer side in the circumferential direction. Therefore, referring to FIG. 2 (B), the fitting between the enlarged diameter portion 42 of the plug 12 and the steel ball 22 is released, and the steel ball 24 and the enlarged diameter portion 42 on the rear end side are fitted and half-inserted. It becomes a state.

  Also, referring to FIG. 3A, a groove 62 is provided in which the inner surface of the end portion on the front end side of the outer support portion 26 is recessed in an L shape. When the steel ball 20 shown in FIG. 2B is fitted into the groove 62, the relative positions of the base 18 and the outer support 26 are restricted in the axial direction and the rotational direction.

  With reference to FIG. 4 and FIG. 5, the correlation with the base 18, the spring 34, and the outer side support part 26, and the accommodation hole provided in the base 18 are demonstrated. 4A is a perspective view of these viewed from the front end side, and FIG. 5 is a perspective view of these viewed from the rear end side.

  With reference to FIG. 4, the accommodation hole formed in the base 18 is demonstrated. 4A is an exploded perspective view showing a part of the socket 10, and FIG. 4B is a cross-sectional view showing the pipe joint 14 provided with the socket 10.

  Referring to FIG. 4A, as described above, the base 18, the spring 34, and the outer support 26 are arranged coaxially from the inside in this order. The spring 34 is compressed in the axial direction, and the end portion on the rear end side abuts on the stepped portion provided on the inner surface of the outer support portion 26, and the end portion on the front end side is provided on the outer surface of the base portion 18. It is in contact with the step.

  A plurality of storage holes 50 and 52 are provided through the base 18 in a circular shape. The storage hole 50 is a hole for storing the steel ball 22 (see FIG. 4B) into which the expanded diameter portion 42 of the plug is fitted in the state where the plug 12 is inserted into the socket 10, and the base 18 is circular. It is provided to penetrate through. The storage holes 50 are arranged at substantially equal intervals in the circumferential direction at the same location in the axial direction of the base portion 18. Here, six storage holes 50 are formed in the base 18.

  The housing hole 52 is provided in a circular shape through the base 18 on the rear end side of the housing hole 50 and accommodates a steel ball 24 that fits into the enlarged diameter portion 42 of the plug 12 in a half-inserted state. It is. The storage holes 52 are provided at substantially equal intervals in the circumferential direction at the same location in the axial direction. Here, three storage holes 52 are formed in the base 18.

  The relative positions of the storage hole 50 and the storage hole 52 will be described. When both are viewed in the axial direction, the storage hole 52 is disposed between the storage holes 50. Thereby, the distance between the storage hole 50 and the storage hole 52 is sufficiently secured.

  Specifically, referring to FIG. 4B, when the plug 12 is inserted into the socket 10, the steel balls 22 and 24 are interposed between the enlarged diameter portion 42 and the enlarged diameter portion 43 of the plug 12. Need to be deployed. This is because the steel ball 22 and the enlarged diameter portion 42 are fitted in the inserted state, and the steel ball 24 and the enlarged diameter portion 42 are fitted in the half inserted state (see FIG. 6B). . Therefore, the storage holes 50 and 52 in which the steel balls 22 and 24 are stored also need to be disposed between the enlarged diameter portion 42 and the enlarged diameter portion 43. However, referring to FIG. 4B, the distance L4 between the enlarged diameter portion 42 and the enlarged diameter portion 43 of the plug 12 is as narrow as about 10 mm, for example. Therefore, in this embodiment, the storage holes 52 are shifted from each other so that the storage holes 52 are disposed between the storage holes 50 when viewed in the axial direction. A suitable position of the storage hole 52 is the central portion between the storage holes 50. Here, six storage holes 50 are provided on the front end side of the base 18, and a storage hole 52 is provided between the storage holes 50 and on the rear end side. In other words, sets each including two storage holes 50 and one storage hole 52 are arranged at substantially equal intervals along the circumferential direction of the base 18.

  Thereby, even if the distance between the end portion on the front end side of the storage hole 50 and the end portion L1 on the rear end side of the storage hole 52 is as short as 10 mm or less, the distance at which the storage hole 50 and the storage hole 52 are separated from each other. L2 and L3 can be ensured to be, for example, 3.0 mm or longer. Therefore, a decrease in mechanical strength of the base 18 due to the provision of the storage holes 50 and 52 is suppressed.

  Further, referring to FIG. 4A, the end portion on the rear end side of the spring 34 is inserted into a hole portion 54 provided on the inner surface of the outer support portion 26. Thereby, the spring 34 and the outer side support part 26 are fixed to a rotation direction. Further, referring to FIG. 5, the end portion on the distal end side of the spring 34 is inserted into a hole portion 58 provided in the step portion of the base portion 18. As described above, both end portions of the spring 34 are inserted into the holes of the outer support portion 26 and the base portion 18, so that the outer support portion 26 is incorporated in a state of being biased in the rotation direction with respect to the base portion 18. Here, the outer side support part 26 is urged | biased so that it may rotate clockwise seeing from the rear end side.

  Furthermore, referring to FIG. 5, a steel ball 60 is embedded in the base 18 so as to be rotatable about half. This steel ball 60 is fitted in an L-shaped groove portion 56 provided in the outer support portion 26 shown in FIG. As a result, the amount of movement of the outer support portion 26 in the axial direction and the rotational direction is restricted.

  With reference to FIG. 6, the structure of the pipe joint 14 in a half-insertion state is demonstrated. 6A is a plan view showing the pipe joint 14 in this state, FIG. 6B is a cross-sectional view taken along the line BB ′ of FIG. 6A, and FIG. 6B is a cross-sectional view taken along line CC ′ in FIG. 6B, and FIG. 6D is a cross-sectional view taken along line DD ′ in FIG.

  Referring to FIG. 6A, in the above-described insertion state, the pipe joint 14 is in a half-insertion state by rotating the outer support portion 26 clockwise as viewed from the distal end side while fixing the base portion 18. Here, the half-inserted state is also referred to as a purge state.

  In the half-inserted state, as shown in FIG. 6C, the steel ball 22 is housed in the deep second groove 48 provided in the outer support portion 26 and moves outward in the radial direction. As a result, referring to FIG. 6 (B), the engagement between the enlarged diameter portion 42 of the plug 12 and the steel ball 22 is released, and the plug 12 is moved to the rear end side together with the inner support portion 25 by the urging force of the spring 34. Moving. On the other hand, referring to FIG. 6B and FIG. 6D, the steel ball 24 on the rear end side is supported by the annular convex portion 47 of the outer support portion 26, and is radially inward from the steel ball 22. Has been placed. Therefore, the enlarged diameter portion 42 of the plug 12 is fitted to the steel ball 24 on the rear end side. At the same time, the valve body 30 is also moved to the rear end side by the biasing force of the spring 28, and the hole portion 44 of the valve body 30 is covered with the partition wall portion 19. Thereby, the communication between the air flow path 38 of the socket 10 and the air flow path 40 of the plug 12 is blocked. Further, since the airtight state between the plug 12 and the socket 10 is released, the compressed air inside the hose connected to the plug 12 is discharged to the outside through the gap between the plug 12 and the socket 10. Further, the air flow path 38 is closed by the valve body 30 inside the hose connected to the socket 10 to ensure an airtight state.

  Next, a non-connected state in which the plug 12 is pulled out from the socket 10 will be described with reference to FIG. FIG. 7A is a plan view showing the pipe joint 14 in a non-connected state, and FIG. 7B is a cross-sectional view taken along line B-B ′ of FIG.

  With reference to FIG. 7A, when the outer support portion 26 is slid to the distal end side while fixing the base portion 18 in the above-described half-inserted state, the fitting between the socket 10 and the plug 12 is released, The plug 12 can be pulled out of the socket 10.

  With reference to FIG. 7 (B), operation | movement of the steel ball 24 etc. at the time of transfering from a semi-insertion state to a non-connection state is demonstrated. When the outer support portion 26 is slid to the distal end side in the half-inserted state, the annular convex portion 47 moves to the distal end side rather than the steel ball 24, and the steel ball 24 moves radially outward. And the enlarged diameter part 42 is pushed out with the inner side support part 25 with the urging | biasing force of the spring 32 to the rear end side, and the fitting with the socket 10 and the plug 12 is cancelled | released completely. At this time, the steel balls 22 and 24 are supported by the inner support portion 25 from the inside.

  For example, the pipe joint 14 of the present embodiment described above can be modified as follows.

  Referring to FIG. 5, in this embodiment, six storage holes 50 are provided on the front end side of base 18, three storage holes 52 are provided on the rear end side, and steel balls are stored in the respective storage holes. This number may be adjusted to an arbitrary number. For example, eight storage holes 50 may be provided, and four storage holes 52 may be provided.

  Referring to FIG. 4A, in the above embodiment, the rear end side storage hole 52 is arranged in the center of the storage holes 50 when viewed in the axial direction, but the positional relationship between the two can be changed. Specifically, when the socket 10 is viewed in the axial direction, a part of the storage hole 52 may be arranged at the center of the storage holes 50. The above-described effects can be sufficiently achieved by the twist.

DESCRIPTION OF SYMBOLS 10 Socket 12 Plug 14 Pipe joint 16 Tip base part 18 Base part 19 Partition part 20 Steel ball 22 Steel ball 24 Steel ball 25 Inner support part 26 Outer support part 28 Spring 30 Valve body 32 Spring 34 Spring 38 Air flow path 40 Air flow path 42 Expanded portion 43 Expanded portion 44 Hole 45 Annular convex 46 First groove 47 Annular convex 48 Second groove 50 Storage hole 52 Storage hole 54 Hole 56 Groove 58 Hole 60 Steel ball 62 Groove

Claims (5)

A base having a substantially cylindrical shape;
A valve body housed in the base,
A plurality of first steel balls housed in a first housing hole provided through the base;
A plurality of second steel balls stored in second storage holes provided through the base on the rear end side of the first storage holes;
A ring-shaped inner support that supports the first steel ball and the second steel ball from the inside and is displaceable along the axial direction;
A ring-shaped outer support portion that supports the first steel ball and the second steel ball from the outside and is displaceable along the axial direction and the rotation direction;
First biasing means for biasing the valve body along the axial direction;
A second biasing means for imparting a biasing force to the inner support portion along the axial direction;
A third urging means for applying an urging force to the outer support portion along the axial direction and the rotation direction,
In the insertion state in which the plug is inserted to be in an airtight state, the diameter of the plug is increased on the first steel ball disposed radially inward by contacting the first groove provided on the inner surface of the outer support portion. Part is mated,
In the semi-insertion state in which the plug is inserted to be in an airtight state, the outer support portion is displaced in the rotation direction, so that the second groove is provided on the inner surface of the outer support portion and is deeper than the first groove. The stored first steel ball is disposed radially outward, the fitting between the first steel ball and the expanded diameter portion of the plug is released, and the expanded diameter portion of the plug is connected to the second steel ball. Mated,
In the non-insertion state in which the plug is pulled out, the outer support portion is displaced in the axial direction, whereby the first steel ball and the second steel ball are disposed radially outward, and the plug The socket characterized in that the fitting between the enlarged diameter portion and the second steel ball is released.   The socket according to claim 1, wherein the second storage hole is disposed between the first storage holes when viewed from the axial direction.   The socket according to claim 1 or 2, wherein the first groove and the second groove are provided at equal intervals along a circumferential direction.   The one end of the third urging means is inserted into the hole of the base portion, and the other end of the third urging means is inserted into the hole portion of the outer support portion. 4. The socket according to any one of 3. A pipe joint comprising the socket according to claim 1 and a plug inserted into the socket.

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