JP6000141B2 - Pipe fitting and its socket - Google Patents

Description

  The present invention relates to a pipe joint, and more particularly to a pipe joint suitable for food piping and a socket (female joint member) constituting the pipe joint.

  Since pipes for feeding foods and beverages are prone to breeding bacteria, it is usually necessary to disassemble and clean each time they are used. For this reason, the pipes need to be easily disassembled.

  For this reason, in food piping, a pair of semicircular clamp members are pivoted at one end around the flange of the pipe end, rather than a general flange fitting that attaches a flange at the pipe end and tightens it with a bolt and nut. Pipe fittings that are tightened by turning the attached clamps and tightening the free ends of both semicircular clamp members to each other are widely used, but in food piping, connection / disconnection (disassembly) is frequent. In addition, it is required to be able to perform connection and disconnection (disassembly) operations more easily.

  In response to such demands, pipe joints have been developed to facilitate pipe connection / disconnection operations. For example, Patent Documents 1 and 2 include a socket (female joint member) attached to one of pipe ends to be connected and a plug (male joint member) attached to the other and inserted into the socket. A generally U-shaped locking member having a slender plug locking portion which is arranged in the circumferential direction around the socket and has elasticity extending on both sides in the diameter direction of the socket. When the locking part is inserted into the socket through the openings provided on both side surfaces of the socket and the plug is inserted into the socket, the plug is inserted while pushing the plug locking part away from each other, and the insertion is completed. The plug locking part is engaged with an annular groove provided on the outer peripheral surface of the plug, and in that state, a cover that covers the connected pipe ends is attached. The plug locking portion is disclosed that to prevent apart from one another. However, these pipe joints all have a large number of parts, and do not fully satisfy the ease of disassembly and the ease of cleaning required for pipe joints in the food and beverage fields.

  On the other hand, the inventor of the present application is a pipe joint using a substantially U-shaped locking member having a pair of plug locking portions, but the plug is inserted into the socket without using the cover member as described above. In this case, there has been proposed a pipe joint in which a locking operation member that is rotatable in order to connect / disconnect the distal end portions of both plug locking portions of the locking member to the socket is proposed. This pipe joint has a smaller number of parts than those disclosed in Patent Documents 1 and 2 and the like, and can be connected / disconnected by a simple operation and is easy to clean (patent) Reference 3).

JP 2006-226532 A JP 2004-125158 A JP2011-7303

  The present invention is obtained by further improving the one disclosed in Patent Document 3, and an object of the present invention is to provide a pipe joint that can be connected / disconnected with a simpler operation, has fewer parts, and is easy to clean. And

That is, the present invention
In a socket in a pipe joint comprising a socket and a plug inserted and connected to the socket,
A cylindrical socket body for receiving the plug, the socket body having two openings provided at intervals in the circumferential direction and penetrating the socket body in the radial direction;
A plug locking member configured to extend around the socket body in the circumferential direction so as to surround the socket body, and has both ends that are opposed to each other in the circumferential direction of the socket body around the socket body And a plug locking portion that passes through the two openings in a portion from one end to the other of the both end portions of the plug locking member and enters the inner peripheral surface of the socket body, and is inserted into the socket body. A plug locking member having a plug locking portion for engaging with the outer peripheral surface of the plug and holding the plug in the socket;
A locking operation member set so as to be rotatable about an axis extending in a radial direction of the socket body between the opposite end portions of the plug locking member, the plug being inserted into the socket body A plug setting position for allowing the both end portions to be separated from each other when the plug locking portion is displaced away from each other by the plug locking portion; A locking operation member that is rotatable between a locking position that prevents both end portions of the plug locking member held inside from being displaced in a direction away from each other;
Have
The socket body includes a shaft portion that protrudes radially outward from the outer peripheral surface of the socket body between the both end portions of the plug locking member, and a radially outer tip of the shaft portion provided from the tip of the shaft portion. A first mounting protrusion comprising a head portion having a portion extending outward in the transverse direction with respect to the axis of the shaft portion;
The locking operation member includes an insertion hole that allows the head portion to be inserted in the direction of the axis of the shaft portion, an annular hub portion around the insertion hole, and a position facing the hub portion in the diameter direction. A pair of arm portions extending, the pair of arm portions being spaced radially outward from the hub portion and extending in one of a clockwise direction and a counterclockwise direction about the axis. The locking member of the plug locking member is engaged with the outer periphery of the plug inserted into the socket, and the locking operation member is clockwise and counterclockwise around the axis of the shaft portion. The circumferential portion of the arm portion becomes the radially outer position of both end portions of the plug locking member so that the both end portions are separated from each other. To prevent it from moving,
In the locking operation member, the insertion hole passes through the head portion of the first mounting projection in the axial direction of the shaft portion to be a position around the shaft portion, and the lock operating member is disposed in the shaft portion. An operating member mounting position that allows the shaft to be set to be rotatable around the shaft portion, and is rotated around the axis line from the operating member mounting position. When the plug is set, the insertion hole is shaped so that the head cannot be inserted in the direction of the axis, and the outer peripheral edge of the hub portion is the plug locking member. There is provided a socket for a pipe joint having a locking portion for engaging with both ends to lock the locking operation member in the plug setting position.

  In the socket of this pipe joint, the locking operation member is set as the operation member mounting position so as to be rotatable around the shaft portion of the first mounting portion, and is set to the plug setting position around the shaft portion. If it is rotated, when the plug is subsequently inserted into the socket and the locking operation member is rotated to the locking position, there is no possibility that the locking operation member is detached from the socket body. In the pipe joint of Patent Document 3 described above, a mounting pin is required to prevent the locking operation member from being detached from the socket body. However, such a mounting pin is not necessary, and therefore the number of parts is small. The work of assembling the socket body and the locking operation member into a socket and the work of disassembling it are facilitated. Further, since there are no small parts that need to be removed when the socket is cleaned, such as the mounting pins, the possibility of loss that occurs when the small parts are removed can be eliminated.

  The said locking part in the said socket has a recessed part formed in the outer periphery of the said hub part, and can accept the both ends of the said plug locking member.

  By receiving both ends of the plug locking portion in the locking recess, the locking operation member is prevented from rotating and the locking operation portion is locked at the plug setting position.

  The cross section of the head of the first mounting projection may be non-circular, and the cross section of the insertion hole may be a complementary shape to the cross section of the head.

  The shaft portion of the first mounting projection has a circular cross section, and the head has an arcuate edge having a diameter larger than that of the shaft portion, and at least one recess edge recessed radially inward from the arcuate edge The cross section of the insertion hole may have an arcuate portion corresponding to the arcuate edge and a convex portion corresponding to the recess edge.

The socket body has a shaft portion extending outwardly along an axis extending in the diameter direction of the socket body at a position opposite to the diameter direction of the socket body from the first mounting protrusion on the outer peripheral surface thereof. A second mounting protrusion comprising a head having a cross section larger than that of the shaft portion;
The plug locking member is provided at a position between the two plug locking portions, and a second insertion hole that allows the head of the second mounting projection to be inserted in the direction of the axis of the second mounting projection. And when the second insertion hole is positioned around the shaft portion of the second mounting projection through the head of the second mounting projection, the engagement is performed around the shaft portion of the second mounting projection. And a locking member fixture that engages with the head of the second mounting projection to prevent the displacement when the second insertion hole is about to be displaced outward along the axis of the second mounting projection. Can be included.

  The plug locking member fixture is a generally U-shaped member having a pair of elongated fixing portions extending in the tangential direction of the shaft portion on both sides of the shaft portion of the second mounting projection, When the second insertion hole attempts to displace outward along the axis of the second mounting projection, it engages with the head of the second mounting projection to prevent the displacement. The fixing portions are biased in a direction approaching each other, and the locking member attachment is displaced in the direction of the open end of the substantially U shape or in the opposite direction so that it is separated from the head. Engagement can be prevented.

  The present invention also provides a pipe joint having a socket as described above and a plug inserted and connected to the socket.

  Specifically, the plug includes a front end portion having a small diameter, a taper portion having a diameter that increases toward the rear after the front end portion, and a diameter smaller than the rear end of the taper portion following the taper portion. A locking portion larger than the portion, and the locking portion engages with the plug locking portion of the plug locking member in a state where the plug is inserted and fitted into the socket. The plug locking portion can be prevented from being pulled out from the socket body, and the locking operation member can be rotated to the locking position by separating the plug locking portion from the locking portion of the locking operation member.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a pipe joint according to the present invention will be described with reference to the accompanying drawings.

It is a top view of the pipe joint concerning the present invention, and shows the state where the socket and plug which constitute the pipe joint are separated, and the locking operation member of the socket exists in the plug setting position. It is the 1B-1B sectional view taken on the line of FIG. 1A. It is a top view which shows the state in which the plug was inserted in the socket. FIG. 2B is a cross-sectional view taken along line 2B-2B in FIG. 2A and rotated 90 degrees counterclockwise. It is a top view which shows the state by which the plug was inserted in the socket and the locking operation member was made into the locking position. FIG. 3B is a diagram illustrating a cross-sectional view taken along line 3B-3B in FIG. 3A by rotating it 90 ° counterclockwise. It is a top view which shows the state by which the locking operation member was made into the open position in the state in which the plug was inserted in the socket. It is the 4B-4B sectional view taken on the line of FIG. 4A. It is a cross-sectional side view of a socket main body and a plug. It is a top view of a socket main body. It is a perspective view of the plug locking member attached to a socket main body. FIG. 6 is a right side view of the plug of FIG. 5. It is a figure which shows the procedure for attaching a plug locking member to a socket main body, (A) shows the state immediately after attaching a locking operation member to a socket main body, (B) is a locking operation member, a plug locking member is a socket. A state where the plug locking member is rotated to a position for attachment to the main body, (C) shows a state where the plug locking member is inserted and attached from below the socket main body, and (D) shows a state where the plug locking member is attached to the socket body. Show. It is a top view of a locking operation member. FIG. 6 is a right side view of the socket body of FIG. 5. It is a top view of the head of the projection for attachment provided in the top part of the socket main part. It is a figure which shows the structure for mounting | wearing with the protrusion for attachment provided in the bottom part of the socket main body with a plug locking member, (A) is in the position which prevents a locking member fixture from removing a plug locking member from a socket main body. A state is shown, (B) has shown the state which exists in the position which displaced the locking member attachment tool and the plug locking member removed from the socket main body.

  As shown in FIGS. 1A and 1B, the pipe joint 10 according to the present invention includes a socket 12 and a plug 14 inserted and connected to the socket. The tube 12 is connected to the rear end of each of the socket 12 and the plug 14.

  The socket 12 includes a socket body 16 (FIGS. 1A, 1B, 5, and 6) that receives the plug 14, and a plug locking member that is set to surround the socket body by extending in the circumferential direction around the socket body. 18 (FIGS. 1B and 7), and a locking operation member 20 (FIGS. 1A, 1B, 9, and 10) for operating the plug locking member 18 to connect / disconnect the plug to / from the socket; Have

  As shown in FIGS. 5 and 6, the socket body 16 is a cylindrical member as a whole, and has a through hole 16 b extending from a large-diameter receiving portion 16 a that receives the plug 14 from the front end to the rear end.

  The peripheral wall 16c that defines the receiving portion 16a is provided with elongated openings 16d and 16d that are aligned with each other in the circumferential direction on the left and right sides thereof, and that penetrates the peripheral wall 16c in the radial direction.

  As shown in FIG. 1B and FIG. 7, the plug locking member 18 is formed of an elongated leaf spring material and is generally U-shaped as a whole, and the central lower portion 18b has a mounting hole 18d. A mounting projection 22 provided on the outer peripheral surface of the socket main body 16 and extending radially outward of the socket main body 16 is passed through the mounting hole 18d and attached to the socket main body 16, and extends in the circumferential direction of the socket main body 16. In the top portion of the socket body 16, both end portions 18a, 18a face each other. A portion of the plug locking member 18 extending from the central lower portion 18b to both end portions 18a, 18a passes through the left and right openings 16d, 16d of the socket body 16, and a part of the plug locking member 18 enters the inside of the inner peripheral surface 16f of the peripheral wall 16c. It is set as the parts 18c and 18c. The plug locking portions 18c and 18c are separated from each other to such an extent that the small-diameter front end portion 14a of the plug 14 inserted into the receiving portion 16a can pass between the plug locking portions 18c and 18c. When the plug 14 is expanded by the portion 14b and is radially aligned with the small-diameter engaging portion 14c formed at the rear portion of the tapered portion 14b of the plug 14, the plug 14 is engaged with the engaging portion 14c. Lock inside. In the illustrated example, both end portions 18a, 18a of the plug locking member 18 extend upward from the upper end portions 16e, 16e of the openings 16d, 16d, and have their tip portions slightly bent outward. As can be seen from FIG. 8 which is a right side view of the plug 14 shown in FIG. 5, the rear side of the locking portion 14c has substantially the same outer diameter as the front end portion 14a. Three support protrusions 14d are provided at equal intervals in the circumferential direction, and engage with the inner peripheral surface 16f of the receiving portion 16a of the socket body 16 when the plug 14 is inserted and fitted into the socket 12. Thus, the plug 14 can be kept aligned with the socket 12 in the axial direction.

  The locking operation member 20 is rotatably fixed to the outer peripheral surface of the socket body 16 between both end portions 18a, 18a of the plug locking member 18 by mounting protrusions 24, and both end portions 18a, 18a of the plug locking member 18 have a radius. Locking position (FIGS. 3A and 3B) that prevents spreading outward in the direction, release position (FIGS. 4A and 4B) separating both end portions 18a and 18a, and separation of both end portions 18a and 18a from each other It can be displaced between the allowable plug setting positions (FIGS. 1A to 2B). As will be described later, when the plug 14 is inserted into the receiving portion 16a of the socket body, the taper portion 14b of the plug 14 pushes the plug locking portions 18c and 18c outward in the radial direction when the plug 14 is inserted into the receiving portion. The locking position (FIG. 3A, FIG. 3B) is a position that allows the plug 14 to be moved into the socket 16a. When the plug 14 is inserted into the socket body, the plug locking engagement with the locking portion 14c of the plug 14 is performed. This is a position for preventing the portions 18c and 18c from coming off the locking portion 14c and locking the plug 14 in the receiving portion 16a. In the release position (FIGS. 4A and 4B), the plug locking portions 18c and 18c are disengaged from the locking portions 14c of the plug 14 by pushing out both end portions 18a and 18a of the plug locking member 18, and the plug 14 is pulled out from the socket 12. It is a position to make possible.

  Specifically, the locking operation member 20 includes a hub portion 20a that is rotatable about the axis 24a of the mounting projection 24, and a pair of arm portions 20b extending from positions opposed to each other in the diameter direction of the hub portion 20a. 20b, and the arm portions 20b, 20b have circumferential portions 20c, 20c spaced radially outward from the hub portion 20a and extending clockwise about an axis 24a. The circumferential portions 20c and 20c are provided with protrusions 20f and 20f for placing a finger when the operator rotates the locking operation member 20.

  The hub portion 20a has an insertion hole 20g through which the mounting protrusion 24 is passed in the center. As shown in FIGS. 9A and 10, the insertion hole 20 g has a circular cross section as a whole, but has protrusions 20 g-1 on the left and right as viewed in the same drawing.

  The mounting protrusion 24 has a shaft portion 24b extending along a radial axis 24a (FIGS. 1, 2, and 11) of the socket body 16 and a head portion 24c formed at the tip of the shaft portion. . The shaft portion 24b has a circular cross section, and the head portion 24c has a larger cross section than the shaft portion 24b as a whole, and has a shape complementary to the cross section of the insertion hole 20g of the locking operation member 20. That is, as shown in FIG. 12, an arcuate edge 24c-1 corresponding to the arc 20g-2 (FIG. 10) of the insertion hole 20g and a recess edge 24c-2 corresponding to the protrusion 20g-1 of the insertion hole 20g are formed. Have.

  The locking operation member 20 has a set position (that is, the head of the mounting projection 24) that allows the insertion hole 20g to be set around the shaft portion 24b through the head 24c of the mounting projection 24. From the position where the protrusion 20g-1 on the inner peripheral surface of the insertion hole 20g corresponding to the recess edge 24c-2 of the portion 24c corresponds to the recess edge 24c-2 of the head 24c of the mounting protrusion 24), the shaft portion 24b When the plug is set to the plug setting position (FIG. 1A, FIG. 9B), the projection 20g-1 of the insertion hole 20g is not aligned with the recess edge 24c-2, and the head 24c Are not allowed to be inserted in the axial direction, and both end portions 18a of the plug locking member 18 are respectively received at the outer peripheral edge 20a-1 of the hub portion 20a so that the locking operation member 20 is moved from the plug setting position. Stop turning It has a part 20h.

  When the locking operation member 20 is in the plug setting position (FIG. 1A, FIG. 9B), the plug 14 is inserted into the receiving portion 16a of the socket body 16, and the plug locking portion 14c of the plug 14 is plug-locked. In a state where the portions 18c and 18c are fitted, the both end portions 18a and 18a of the plug locking member 18 are slightly detached outward from the recesses 20h and 20h of the hub portion 20a (FIGS. 2A and 2B).

  In this state, when the locking operation member 20 is rotated clockwise around the axis 24a, the circumferential portions 20c and 20c of the arm portions 20b and 20b are moved radially outward of both end portions 18a and 18a of the plug locking member 18. It will be in the state adjacent to both ends, and it will prevent that this both ends separate from each other (FIG. 3A, FIG. 3B). This position is the above-described locking position of the locking operation member 20, and in this embodiment, the circumferential portions 20c of the arm portions 20b and 20b, and the radially inner edge 20c-1 of the 20c are provided at both ends of the plug locking member 18. Protrusions 20i and 20i are provided as locking member locking portions that engage with the portions 18a and 18a to prevent clockwise rotation.

  The side surfaces 20j and 20j (FIG. 10) in which the protrusions 20i and 20i of the locking operation member 20 in the locking position (FIG. 3A) are engaged with both end portions 18a and 18a of the plug locking member 18 are slightly inclined. When the locking operation member 20 is rotated counterclockwise with a certain force or more, the inclined side surfaces 20j and 20j rotate while displacing both end portions 18a and 18a of the plug locking member 18 radially inward. . Thus, when the locking operation member 20 is changed from the locking position (FIG. 3A) to the release position (FIG. 4A), the circumferential portions 20c, 20c of the arm portions 20b, 20b are disengaged from the radially outer position of the plug locking member 18, The hub portion 20a engages both end portions 18a, 18a of the plug locking member 18 from the inside in the radial direction, pulls the both end portions 18a, 18a away from each other, and the plug locking portions 18c, 18c of the plug locking member 18 are connected to the plug 14. So as to be disengaged radially outward from the locking portion 14c.

  When the locking operation member 20 is rotated from the locking position (FIG. 3A) to the release position (FIG. 4A), the hub portion 20a has an engagement position that engages with both end portions 18a and 18a of the plug locking member 18. As the locking operation member 20 rotates, it is contoured so as to gradually move away from the axis 24a, and both end portions 18a, 18a are gradually separated from each other by the rotation of the locking operation member 20 to the release position. Yes.

  FIG. 13 shows a structure for attaching the plug locking member 18 to an attachment projection 22 provided at the bottom of the socket body 16. That is, as shown in FIG. 7, the central lower portion 18b of the plug locking member 18 is provided with standing edges 18e on both sides of the mounting hole 18d, and each of the standing edges 18e is provided with two openings 18f. In addition, a locking member attachment 30 for attaching the plug locking member to the attachment protrusion 22 is attached to the central lower portion 18b as a whole in a substantially U shape. The locking member fixture 30 is formed by bending an elongated spring member, and has a central portion 30a formed by bending the spring member into an oval shape and a pair of fixing portions 30b extending from both sides of the central portion 30a. The fixing portion 30b is passed through the opening 18f of one rising edge 18e (upper side in the drawing) and further through the opening 18f of the other rising edge 18e (lower side in the drawing). The tip portion 30c is opened to the left and right. As shown in FIG. 13A, when the fixing portions 30b are attached to the central lower portion 18b as described above, the fixing portions 30b are substantially parallel to each other, and are inwardly provided on the fixing portions 30b. The curved portion 30d overlaps with the mounting hole 18d of the central lower portion 18b. In this state, the inclined portion 30e extending from the inwardly curved portion 30d to the tip portion 30c obliquely passes through the opening 18f of the lower standing edge 18e and engages with the edge of the opening, so that the lower center portion of the plug locking member 18 is engaged. The position of the locking member fixture 30 with respect to the portion 18b is fixed. In this state, the central portion 30a is positioned away from the upper standing edge 18e as viewed in the figure of the plug locking member 18 ((B) of FIG. 13).

  The mounting protrusion 22 has the same shape as the mounting protrusion 24 provided on the top of the socket body 16, and in order to attach the locking member mounting tool 30 to the socket body 16 as shown in FIG. When the plug locking member 18 having the locking member mounting tool 30 in the state shown in (A) is fitted into the mounting projection 22 in the mounting hole 18d, the head portion 22a of the mounting projection 22 (FIG. 1B). Advances while pushing the inwardly curved portion 30d of the locking member fixture 30 outward, and when the shaft portion 22b of the mounting projection 22 is in a position corresponding to the locking member fixture 30, the inwardly curved portion 30d is the original It moves to the inner position and comes to engage with the outer peripheral surface of the shaft portion 22b, so that the locking member attachment tool 30 is not detached from the attachment projections 22.

  When the plug locking member 18 is removed from the socket body 16, the plug 14 is removed from the socket 12, and the central portion 30a of the locking member mounting tool 30 is pushed in as shown in FIG. As a result, the inclined portion 30e of the fixing portion 30b of the locking member fitting 30 slides on the edge of the opening 18f of the lower standing edge 18e as seen in the figure, and the fixing portion 30b opens to the outside. The inwardly curved portion 30d of 18b is displaced to the outside of the mounting opening 18d of the plug locking member 18, so that the plug locking member 18 can be detached from the mounting protrusion 22.

  Although one embodiment of the pipe joint according to the present invention has been described above, the present invention is not limited to this. For example, in the illustrated example, the locking member mounting tool 30 is configured to open the fixing portion 30b by being pushed into the plug locking member. However, the locking member mounting tool 30 is displaced in the direction in which the locking member mounting tool 30 is pulled out from the plug locking member. Thus, the fixing portion 30b can be opened.

Pipe joint 10; Socket 12; Plug 14; Front end portion 14a; Tapered portion 14b; Locking portion 14c; Socket body 16; Receiving portion 16a; Through hole 16b; Plug locking member 18; both end portions 18a and 18a; central lower portion 18b; plug locking portion 18c; mounting hole 18d; standing edge 18e; opening 18f; locking operation member 20; hub portion 20a; Portion 20b; circumferential portion 20c;
Radial inner edge 20c-1; insertion hole 20g; projection 20g-1; arc 20g-2; projection 20f; recess 20h; projection 20i; side 20j; mounting projection 22 (second in the claims) Head portion 22a; shaft portion 22b; mounting projection 24 (first mounting projection in the claims); axis 24a; shaft portion 24b; head portion 24c; arcuate edge 24c- 1; recess edge 24c-2; locking member fixture 30; central portion 30a; fixing portion 30b; tip portion 30c; inwardly curved portion 30d;

Claims (8)

In a socket in a pipe joint comprising a socket and a plug inserted and connected to the socket,
A cylindrical socket body for receiving the plug, the socket body having two openings provided at intervals in the circumferential direction and penetrating the socket body in the radial direction;
A plug locking member configured to be removable from the socket body so as to extend around the socket body in a circumferential direction and surround the socket body , and is mutually connected in the circumferential direction of the socket body around the socket body. A plug locking portion that passes through the two openings in a portion extending from one end to the other of the both end portions of the plug locking member, and enters the inside of the inner peripheral surface of the socket body. A plug locking member having a plug locking portion for engaging with the outer peripheral surface of the plug inserted into the socket body to hold the plug in the socket;
A locking operation member set so as to be rotatable about an axis extending in a radial direction of the socket body between the opposite end portions of the plug locking member, the plug being inserted into the socket body A plug setting position for allowing the both end portions to be separated from each other when the plug locking portion is displaced away from each other by the plug locking portion; A locking operation member that is rotatable between a locking position that prevents both end portions of the plug locking member held inside from being displaced in a direction away from each other;
Have
The socket body includes a shaft portion that protrudes radially outward from the outer peripheral surface of the socket body between the both end portions of the plug locking member, and a radially outer tip of the shaft portion provided from the tip of the shaft portion. A first mounting protrusion comprising a head portion having a portion extending outward in the transverse direction with respect to the axis of the shaft portion;
The locking operation member includes an insertion hole that allows the head portion to be inserted in the direction of the axis of the shaft portion, an annular hub portion around the insertion hole, and a position facing the hub portion in the diameter direction. A pair of arm portions extending, the pair of arm portions being spaced radially outward from the hub portion and extending in one of a clockwise direction and a counterclockwise direction about the axis. The locking member of the plug locking member is engaged with the outer periphery of the plug inserted into the socket, and the locking operation member is clockwise and counterclockwise around the axis of the shaft portion. The circumferential portion of the arm portion becomes the radially outer position of both end portions of the plug locking member so that the both end portions are separated from each other. To prevent it from moving,
該施unlocking operation member becomes a position around the shaft portion insertion hole is through the head portion of the projection for attaching the first in axial line direction of the shaft portion, those該施Jomisao operation member shaft An operating member mounting position that allows the shaft to be set to be rotatable around the portion, and the operating member mounting position to rotate around the axis while being set around the shaft portion. When the plug is set to the plug setting position, the insertion hole is shaped so that the head cannot be inserted in the direction of the axis, and the outer peripheral edge of the hub portion is formed by the plug locking member. engaged with the both ends fraction of該施unlocking operation member has a locking portion for locking to the plug setting position,
In a state where the plug locking member is attached to the socket body, the both end portions of the plug locking member rotate around the axis and engage with the locking operation member toward the operation member attachment position in the circumferential direction. In addition, a socket for a pipe joint that prevents the locking operation member from rotating to the operation member mounting position . Locking portion, the socket of the pipe joint according to claim 1 which is to receive the the both end portion of the plug locking members has a recess formed on the outer periphery of the hub portion.   3. The tube according to claim 1, wherein a cross section of the head of the first mounting projection is non-circular, and a cross section of the insertion hole is complementary to the cross section of the head. Fitting socket.   The shaft portion of the first mounting protrusion has a circular cross section, and the head portion has an arcuate edge having a diameter larger than that of the shaft portion, and at least one indented radially inward from the arcuate edge The pipe joint according to any one of claims 1 to 3, further comprising: a concave edge, wherein a cross section of the insertion hole includes an arc-shaped portion corresponding to the arc-shaped edge and a convex portion corresponding to the concave edge. Socket. The socket body has a shaft portion extending outwardly along an axis extending in the diametrical direction of the socket body at a position opposite to the diametrical direction of the socket body from the first mounting protrusion on the outer peripheral surface thereof. A second mounting protrusion comprising a head having a cross section larger than that of the shaft portion;
The plug locking member is provided at a position between the two plug locking portions, and can be inserted through the head of the second mounting projection in the direction of the axis of the second mounting projection. A locking member fixture attached to the plug locking member, the hole passing through the head of the second mounting projection around the shaft portion of the second mounting projection. The second mounting projection is engaged around the shaft portion and the mounting hole is displaced outwardly along the axis of the second mounting projection. The socket for a pipe joint according to any one of claims 1 to 4, further comprising: a locking member fixture that engages with the head portion of the second mounting projection to prevent the displacement.   The locking member fixture is a generally U-shaped member having a pair of elongated fixing portions respectively extending in the tangential direction of the shaft portion on both sides of the shaft portion of the second mounting protrusion, When the mounting hole is to be displaced outward along the axis of the second mounting projection, the mounting hole engages with the head of the second mounting projection to prevent the displacement. The fixing portions are biased in a direction approaching each other, and the locking member fixture is displaced in the direction of the open end of the substantially U-shape or vice versa, thereby separating the heads from each other. 6. The socket according to claim 5, wherein said engagement with said is prevented from occurring.   A pipe joint comprising the socket according to any one of claims 1 to 6 and a plug inserted and connected to the socket. The plug has a small-diameter front end that can be advanced between the plug locking portions of the plug locking member, and a taper that can be advanced while pushing the plug locking portion as the diameter increases toward the rear following the front end portion. And a locking portion having a diameter smaller than the rear end of the taper portion and larger than the front end portion at a position subsequent to the taper portion, and the locking portion is fitted into the socket when the plug is inserted into the socket. in engaged state, engage the plug locking portion of the plug locking members, together with the plug is prevented from being withdrawn from the socket body, release the both end portions from the engaging portion of該施unlocking operation member The pipe joint according to claim 7, wherein the locking operation member is configured to be rotatable to the locking position.

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