Quick Coupler

Abstract

When the sleeve built into the plug or socket of a quick coupler is movable, the present invention provides a sleeve that maintains its shape and can form an external flow path that ensures a sufficient fluid flow rate. [Solution] In a quick coupler 1 in which a fluid shut-off means is configured by a plug-side valve body 24 that moves along a plug-side sleeve 23 built into the plug 2, the plug-side sleeve 23 is movable and has a plurality of plug-side support walls 232 in the circumferential direction of its outer surface that extend in the direction of movement of the plug-side sleeve 23 and protrude outward in the radial direction of the cross-section and slide in contact with the inner circumferential surface of the plug 2, and the space between the plug-side support walls 23 is configured as a plug-side outer flow path 233.

Description

【Technical Field】 【0001】 The present invention relates to a quick coupler (joint having fluid shut-off means) used for connecting and separating hydraulic pipes of an attachment detachment device of a construction machine, for example. 【Background Art】 【0002】 A quick coupler inserts and removes a plug into and from a socket to connect and separate pipes connected to the plug and the socket respectively. A quick coupler for connecting and separating pipes of an attachment detachment device of a construction machine has fluid shut-off means for preventing oil leakage provided in the plug and the socket. Thereby, in the separated state before the plug is inserted into the socket, the fluid shut-off means is closed in the quick coupler to prevent oil from leaking out of the plug and the socket, and in the connected state where the plug is inserted into the socket, the fluid shut-off means is opened to communicate the plug and the socket to form a flow path so that oil can flow. 【0003】 The flow path in the plug or socket that opens and communicates the fluid shut-off means is configured as an external flow path outside the components partitioning the components constituting the plug or socket or an internal flow path inside the components (for example, Patent Document 1). The plug disclosed in Patent Document 1 uses a through hole in a sleeve (cylindrical partitioning body) with a valve body (movable body) externally fitted as the internal flow path, and the gap between the case of the plug and the sleeve as the external flow path. The socket disclosed in Patent Document 1 also uses a through hole in a sleeve with a valve body externally fitted as the internal flow path, and the gap between the case of the plug and the sleeve as the external flow path, similar to the plug. 【Prior Art Documents】 【Patent Documents】 【0004】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2000-055258 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0005】 When the sleeve built into the plug or socket of a quick coupler is movable, the external flow path formed by the sleeve is often provided as a through-hole in the circumferential wall of the sleeve in order to maintain its shape. In this case, if the circumferential wall of the sleeve does not have sufficient thickness, the external flow path, which is a through-hole, becomes narrow, and it becomes impossible to flow the necessary and sufficient fluid (e.g., oil). Therefore, we investigated a sleeve that can form an external flow path that maintains its shape and ensures a sufficient fluid flow rate when the sleeve built into the plug or socket of a quick coupler is movable. [Means for solving the problem] 【0006】 The quick coupler developed as a result of the study is characterized in that a fluid shut-off means is configured by a valve body that moves along a sleeve built into a plug or socket, the sleeve is movable and has a plurality of support walls in the circumferential direction of its outer surface that extend in the direction of movement of the sleeve and protrude outward in the radial direction of the cross-section and slide in contact with the inner surface of the plug or socket, and the space between the support walls is an external flow path. Preferably, the sleeve has a plurality of support walls at equal intervals in the circumferential direction of its outer surface, and the external flow path between the support walls has a semicircular cross-section. [Effects of the Invention] 【0007】 The quick coupler of the present invention has support walls provided on the outer circumferential surface of the sleeve that slide against the inner circumferential surface of the plug or socket. As a result, the inner circumferential wall of the plug or socket is supported by the support walls, and the radially outward-opening external flow channel maintains its shape. Furthermore, the radially outward-opening external flow channel can increase the fluid flow rate compared to a through-hole. If multiple support walls are provided at equal circumferential intervals on the outer circumferential surface of the sleeve, the stress on the support walls can be made uniform in the circumferential direction, preventing damage to the support walls due to stress concentration. If the external flow channel is formed with a semi-circular cross-section, the stress on the support walls can be relieved in the circumferential direction of the outer circumferential surface of the sleeve along the cross-sectional shape of the external flow channel. This improves the load-bearing capacity of the support walls and allows the external flow channel to maintain its shape more stably. [Brief explanation of the drawing] 【0008】 [Figure 1] This is a perspective view of an example of a quick coupler to which the present invention is applied, as seen from the socket side. [Figure 2] This is a perspective view of the quick coupler in this example, seen from the plug side. [Figure 3] This is a cross-sectional view of the quick coupler in this example, with the plug and socket separated. [Figure 4] This is a perspective view from the socket side showing the assembly relationship between the plug-side sleeve and the plug-side valve body that make up the plug. [Figure 5] This is a perspective view of the socket-side connector body, which makes up the socket, as seen from the plug side. [Figure 6] This is a cross-sectional view showing the first step in inserting the plug into the socket, specifically the state when you begin to insert the plug into the socket. [Figure 7] This is a cross-sectional view of the socket-side sleeve O-ring after it has passed the socket-side communication hole, as part of the insertion procedure 2 for inserting the plug into the socket. [Figure 8] This is a cross-sectional view showing the state after the plug-in procedure 3, in which the plug-in side external flow path is connected to the socket-side communication hole, and the plug and socket are connected. [Figure 9] This is a cross-sectional view showing the procedure for inserting and removing a plug from a socket, with the O-ring for the socket-side sleeve straddling the communication hole on the socket side. [Modes for carrying out the invention] 【0009】 The embodiments for carrying out the present invention will be described below with reference to the figures. As shown in Figures 1-3, the present invention is applied to a quick coupler 1 used, for example, for connecting and disconnecting hydraulic piping in an attachment attachment device of construction machinery. The attachment attachment device (not shown) has a fixed hook and a movable hook or a pair of movable hooks that engage with the connection shaft of the attachment. The quick coupler 1 has a plug 2 and a socket 3 positioned on the fixed hook and the movable hook or a pair of movable hooks, and the plug 2 is inserted into and removed from the socket 3 as the movable hook moves to close or connect the oil flow path. 【0010】 Plug 2 consists of a plug-side connecting body 21 to which the plug-side piping 4 is connected, a plug-side insertion body 22 equipped with a plug-side insertion projection 221 that is inserted into the socket 3, a plug-side sleeve 23 that moves through the plug-side intermediate passage 223 of the plug-side insertion body 22, and a plug-side valve body 24 that moves inside the plug-side sleeve 23. In this example, plug 2 forms a passage by directly connecting the plug-side outer passage 233 to the socket-side communication hole 322, so the plug-side sleeve 23 does not have a plug-side inner passage or a plug-side communication hole. 【0011】 The plug-side connection body 21 is a multi-stage cylindrical member in which a large-diameter rear portion (left portion in Figure 3) to which the plug-side piping 4 is connected and a small-diameter front portion (right portion in Figure 3) to which the plug-side insertion body 22 is connected are integrated, and the plug-side connection flow path 213 extends through it in the direction of extension. Female threads to which the plug-side connection connector 41 attached to the plug-side piping 4 is screw-connected are provided on the inner circumferential surface of the plug-side connection flow path 213 in the rear portion. The plug-side piping 4 is connected to the plug-side connection flow path 213 by connecting the plug-side connection connector 41 to the plug-side connection body 21. 【0012】 Furthermore, the plug-side connection body 21 has a male thread on the outer surface of its front half for screw-connecting to the plug-side insertion body 22, and an O-ring 211 for the plug-side body is fitted onto the outer surface of the front half at a position closer to the socket side from the male thread. The screw-connected plug-side connection body 21 and plug-side insertion body 22 are connected in a state where oil leakage is prevented by pressing the O-ring 211 for the plug-side body against the inner surface of the plug-side insertion body 22. 【0013】 Furthermore, the plug-side connection body 21 has a step near the middle of the extension direction of the inner circumferential surface of the plug-side connection passage 213, which supports the plug-side sleeve pressing spring 212 that biases the plug-side sleeve 23 toward the socket. The plug-side sleeve pressing spring 212 is housed in the plug-side connection passage 213 and does not obstruct the flow of oil. The plug-side piping 4 communicates with the outer passage 233 of the plug-side sleeve 23 via the plug-side connection passage 213 of the plug-side connection body 21, the plug-side through hole 231 and plug-side outer passage 233 of the plug-side sleeve 23, and the plug-side intermediate passage 223 of the plug-side insertion body 22. 【0014】 The plug-side insertion body 22 is a multi-stage cylindrical member in which a large-diameter rear portion (left portion in Figure 3) to which the plug-side connection body 21 is connected and a small-diameter plug-side insertion projection 221 that is inserted into the socket 2 are integrated, and a plug-side intermediate flow path 223 passes through in the extending direction. Female threads for screw-connecting the plug-side connection body 21 are provided on the inner circumferential surface of the rear portion. In this example, the plug-side insertion body 22 limits the amount that the plug 2 can be inserted into the socket 3 by bringing the end face of the plug-side restricting portion 222, which is provided at the boundary between the rear portion and the plug-side insertion projection 221, into contact with the end face of the socket-side restricting portion 332. 【0015】 The plug-side insertion projection 221 is a cylindrical member that surrounds an opening communicating with the plug-side intermediate passage 223. When the plug 2 and socket 3 are connected, it pushes the socket-side valve body 34 inward and retracts. When the plug 2 and socket 3 are separated, the forward-moving plug-side sleeve 23 blocks the plug-side intermediate passage 223 from the opening of the plug-side insertion projection 221, and the plug-side valve body 24, which has moved forward from the plug-side sleeve 23, closes the opening of the plug-side insertion projection 221. When the plug 2 and socket 3 are connected, the plug-side valve body 24 retracts first, pushed by the socket-side sleeve 32, followed by the socket-side sleeve 32 retracting, and the plug-side intermediate passage 223 and the open opening of the plug-side insertion projection 221 communicate with each other. 【0016】 The plug-side sleeve 23 is a multi-stage cylindrical member composed of a rear half portion (the left portion in FIG. 3) that has a plurality of plug-side through holes 231 arranged at equal intervals in the circumferential direction and each extending in the moving direction of the plug-side sleeve 23, and a front half portion (the right portion in FIG. 3) that is provided with a plurality of plug-side outer flow paths 233 on the outer peripheral surface which are continuous with the plug-side through holes 231 and extend in the moving direction of the plug-side sleeve 23. The front half portion houses a plug-side valve body 24 inside (see FIG. 4). The plug-side outer flow path 233 in this example is a groove with a semicircular arc-shaped cross section that is formed continuously with the plug-side through hole 231. The plug-side support walls 232 that protrude radially outward from the plug-side sleeve 23 are provided sandwiching the plug-side outer flow paths 233 arranged at equal intervals in the circumferential direction, so they are also arranged at equal intervals in the circumferential direction and provided on the outer peripheral surface of the front half portion. 【0017】 The plug-side outer flow path 233 with a semicircular arc-shaped cross section is formed in the front half portion that moves inside the small-diameter plug-side insertion convex portion 221. Compared with the case where a through hole is provided with a thickness until the outer peripheral surface of the front half portion reaches the inner peripheral surface of the plug-side insertion main body 22, the cross-sectional area can be increased, and a sufficient oil flow rate can be ensured. Also, the plug-side outer flow path 233 with a semicircular arc-shaped cross section releases the stress applied from the plug-side insertion convex portion 221 to the plug-side support wall 232 in the circumferential direction of the outer peripheral surface of the plug-side sleeve 23, improving the load-bearing capacity of the plug-side support wall 232. The plug-side support wall 232 is in sliding contact with the inner peripheral surface of the plug-side intermediate flow path 223 and functions as a guide to stabilize the movement of the plug-side sleeve 23 while maintaining the shape of the plug-side outer flow path 233 that is open radially outward. 【0018】 The plug-side valve body 24 is a flat cylindrical member that closes the opening of the plug-side intermediate flow path 223 in the plug-side insertion convex portion 221, and a plug-side latching bolt 242 protrudes from the inner end surface (the left end surface in FIG. 3). The plug-side latching bolt 242 penetrates the rear end (the left end in FIG. 3) of the plug-side sleeve 23 that supports the externally fitted plug-side valve body pressing spring 234, and a plug-side latching nut 245 is attached. The plug-side valve body 24 is biased in the forward direction, which is the direction to close the opening of the plug-side intermediate flow path 223, by engaging the plug-side latching nut 245 with the rear end of the plug-side sleeve 23 to compress the plug-side valve body pressing spring 234. 【0019】 The plug-side valve body 24 holds the O-ring 241 for the plug-side valve body in an externally fitted state on its outer peripheral surface, presses the O-ring 241 for the plug-side valve body against the inner peripheral surface of the opening, and closes the opening of the plug-side intermediate flow path 223. When the plug 2 is inserted into the socket 3, the plug-side valve body 24 is pushed into the socket-side sleeve 32, retreats while compressing the plug-side valve body pressing spring 234, and opens the opening of the plug-side intermediate flow path 223. Then, when the plug 2 is pulled out from the socket 3, the socket-side sleeve 32 separates, so the plug-side valve body 24 is pushed forward by the plug-side valve body pressing spring 234 and closes the opening of the plug-side intermediate flow path 223 again. 【0020】 The socket 3 is composed of a socket-side connection main body 31 to which the socket-side pipe 5 is connected, a socket-side receiving main body 33 into which the plug 2 is inserted, and a socket-side valve body 34 that moves in a state of being externally fitted to the socket-side sleeve 32 extending from the socket-side connection main body 31. In the socket 3 of this example, when the socket-side valve body 34 moves by being pushed by the plug-side insertion convex portion 221, the socket-side communication hole 322 that was blocked from the outside is communicated with the plug-side outer flow path 233, and the plug-side intermediate flow path 223 and the socket-side inner flow path 321 are connected through the socket-side communication hole 322 to form a flow path. 【0021】 The socket-side connection main body 31 is a multi-stage cylindrical member in which a large-diameter rear half (the right part in FIG. 3) to which the socket-side pipe 5 is connected, a medium-diameter intermediate part (the intermediate part in FIG. 3) to which the plug-side insertion main body 22 is connected, and a smaller-diameter socket-side sleeve 32 are integrated, and a socket-side connection flow path 313 is provided that penetrates the rear half and the intermediate part and extends to the inside of the socket-side sleeve 32. A female thread to which the socket-side connection connector 51 attached to the socket-side pipe 5 is screwed is provided on the inner peripheral surface of the socket-side connection flow path 313 in the rear half. The socket-side pipe 5 is communicated with the socket-side connection flow path 313 by screwing the socket-side connection connector 51 to the socket-side connection main body 31. 【0022】 Furthermore, the socket-side connecting body 31 has a male thread on the outer circumferential surface of its intermediate section for screw-connecting to the socket-side receiving body 32, and an O-ring 311 for the socket-side body is fitted onto the outer circumferential surface of the intermediate section at a position closer to the socket side from the male thread. The screw-connected socket-side connecting body 31 and the socket-side receiving body 32 are connected in a state where oil leakage is prevented by pressing the O-ring 311 for the socket-side body against the inner circumferential surface of the socket-side receiving body 32. In this example, the socket-side connecting body 31 has a socket-side sleeve 32 protruding from its intermediate section, and a socket-side valve body pressing spring 312 fitted onto the socket-side sleeve 32 is supported on the end face of the intermediate section. 【0023】 The socket-side sleeve 32 is a cylindrical member equipped with a socket-side internal passage 321 that communicates with the socket-side connecting passage 313, and its tip is closed (see Figure 5). In this example, the space between the inner circumferential surface of the socket-side receiving body 33 and the outer circumferential surface of the socket-side sleeve 32 is not used as an external passage. The space between the inner circumferential surface of the socket-side receiving body 33 and the outer circumferential surface of the socket-side sleeve 32 is sealed from the outside by the socket-side valve body 34. The socket-side communication hole 322 that connects the socket-side internal passage 321 to the outside is a linear elongated hole perpendicular to the circumferential direction of the O-ring held by the socket-side valve body 34. 【0024】 The socket-side receiving body 33 is a substantially cylindrical member through which the plug-side intermediate flow path 223 passes in the extending direction, and a female thread for screw-connecting the socket-side connecting body 31 is provided on the inner surface of the rear half. In this example, the socket-side receiving body 33 has its end face in contact with the end face of the plug-side restricting portion 222 to limit the insertion amount of the plug 2 into the socket 3. The socket-side restricting portion 332 has an O-ring 331 for the socket-side valve body fitted to its inner surface, and an annular socket-side body step 333 is provided closer to the socket-side connecting body 31 from the O-ring 331 for the socket-side valve body. 【0025】 The socket-side valve body 34 is an annular member with the same end face shape as the plug-side insertion projection 221, which fits between the outer circumferential surface of the socket-side sleeve 32 and the inner circumferential surface of the socket-side restricting portion 332. It has a socket-side valve body step 342 that engages with the socket-side main body step 333, and holds a socket-side sleeve O-ring 341 that presses against the outer circumferential surface of the socket-side sleeve 32 in a fitted state on its inner circumferential surface. In this example, the socket-side valve body 34 is biased in the forward direction (left in Figure 3) by being pressed by a socket-side valve body pressing spring 312 supported in the middle part of the socket-side connecting body 31 from which the socket-side sleeve 32 protrudes. 【0026】 When the plug 2 and socket 3 are separated, the socket-side valve body 34 is pushed by the socket-side valve body compression spring 312, causing the socket-side valve body step 342 to advance (move to the left in Figure 3) until it engages with the socket-side body step 333, and positioning the socket-side sleeve O-ring 341 closer to the outside of the socket-side communication hole 322. When the plug 2 and socket 3 are connected, the socket-side valve body 34 is pushed by the plug-side insertion projection 221, compressing the socket-side valve body compression spring 312, causing the socket-side valve body step 342 to retract (move to the right in Figure 3) away from the socket-side body step 333, and positioning the socket-side sleeve O-ring 341 further away from the outside of the socket-side communication hole 322. 【0027】 In this example, the insertion procedure for inserting a plug into a socket in the quick coupler 1 will be explained. In this example, the quick coupler 1 assigns the plug 2 and socket 3 to the fixed hook and movable hook of the attachment attachment / detachment device, and the movement of the movable hook causes one of the plug 2 and socket 3 to move closer to or away from the other. As a result, in this example, the quick coupler 1 separates the respective flow paths when the plug 2 and socket 3 are separated and closes each flow path (see Figure 3), and connects each flow path when the plug 2 and socket 3 are connected. For the sake of explanation, the movement will be described assuming that the plug 2 moves and is inserted into the socket 3. 【0028】 In insertion procedure 1, when inserting plug 2 into socket 3, as shown in Figure 6, plug 2 is brought close to socket 3, and the plug-side insertion projection 221 and plug-side valve body 24 of plug 2 are brought into contact with the corresponding socket-side valve body 34 and socket-side sleeve 32 of socket 3. In insertion procedure 1, the plug-side intermediate passage 223 to which the plug-side piping 4 is connected is blocked by the plug-side valve body 24, and the O-ring 341 for the socket-side sleeve is located further outward than the socket-side communication hole 322, so no oil leaks from plug 2 and socket 3 during insertion procedure 1. 【0029】 In insertion procedure 2, during the process of inserting plug 2 into socket 3, as shown in Figure 7, the plug-side valve body 24, pushed by the socket-side sleeve 32, retracts (moves to the left in Figure 7) until it engages with a step inside the plug-side sleeve 23. If the plug-side sleeve 23 has not yet retracted in insertion procedure 2, the plug-side intermediate passage 223 communicating with the plug-side piping 4 is blocked from the outside by the plug-side sleeve 23, and the gap between the inner circumferential surface of the plug-side insertion projection 221 and the inner circumferential surface of the plug-side sleeve 23 is blocked by the socket-side sleeve 32 instead of the plug-side valve body 24. 【0030】 Furthermore, in insertion procedure 2, the socket-side valve body 34 of the socket 3 is pushed in by the plug-side insertion projection 221, and the socket-side sleeve O-ring 341 is positioned far from the outside of the socket-side communication hole 322. However, the socket-side communication hole 322 is blocked by the inner surface of the plug-side insertion projection 221, which penetrates the socket-side receiving body 33, and the socket-side valve body O-ring 331 is pressed against its outer surface. In this way, both the plug-side intermediate passage 223 and the socket-side communication hole 322 are blocked from the outside, so no oil leaks from the plug 2 and socket 3 during insertion procedure 2. 【0031】 In insertion procedure 3, when the plug 2 is connected to the socket 3, as shown in Figure 8, the plug 2 is inserted into the socket 3 until the plug-side restricting portion 222 and the socket-side restricting portion 332 come into contact. As a result, the plug-side sleeve 23, which is pushed by the socket-side sleeve 32 via the plug-side valve body 24 engaged with the step, retracts, causing the plug-side intermediate passage 223, which communicates with the plug-side piping 4, to appear in front of the plug-side sleeve 23. The socket-side sleeve 32, which is deeply inserted into the plug-side insertion projection 221, then opens the socket-side communication hole 322 to the plug-side intermediate passage 223. 【0032】 In this way, the plug-side piping 4, the plug-side connecting passage 213, the plug-side through hole 231 and plug-side outer passage 233 of the plug-side sleeve 23, the plug-side intermediate passage 223, the socket-side communication hole 322, the socket-side inner passage 321, the socket-side connecting passage 313, and the socket-side piping are all connected, forming a passage. When the plug 2 and socket 3 are connected, the socket-side valve body O-ring 331 is pressed against the outer surface of the plug-side insertion projection 221, sealing the gap between the plug 2 and socket 3, so no oil leaks occur. 【0033】 The plug-side sleeve 23 retracts while sliding its front half, which is a plug-side support wall 232 that demarcates the plug-side outer passage 233, and its rear half, which has an outer peripheral surface that penetrates the plug-side through hole 231, against the corresponding inner peripheral surface of the plug-side insertion body 22. Since the plug-side through hole 231 is formed by penetrating the rear half of the plug-side sleeve 23, the outer peripheral surface of the rear half supports and maintains the shape of the plug-side insertion body 22. In addition, the plug-side outer passage 233 is maintained in shape by the plug-side support wall 232 supporting the plug-side insertion body 22. When the plug 2 and socket 3 are connected and the passage is formed, the plug-side outer passage 233, which is open radially outward, ensures a sufficient flow rate of oil. 【0034】 In the withdrawal procedure for removing plug 2 from socket 3, as shown in Figure 9, the plug-side valve body 24 begins to retract (move to the left in Figure 9) due to being pushed by the socket-side sleeve 32, and the socket-side valve body 34 begins to retract (move to the right in Figure 9) due to being pushed by the plug-side insertion projection 221. In insertion procedure 2, the plug side continuous with the plug-side intermediate passage 223 is blocked by the plug-side valve body 24, and the socket-side communication hole 322, which is the open end of the socket-side internal passage 321 to which the socket-side piping 5 is connected, is blocked by the socket-side valve body 34, so no oil leaks from plug 2 and socket 3. 【0035】 As the socket-side valve body 34 retracts, the socket-side sleeve O-ring 341 held by the socket-side valve body 34 moves across the socket-side communication hole 322, as can be seen in the core portion of Figure 9. In this example, the socket-side sleeve 32 does not have a groove in the portion including the socket-side communication hole 322, so the socket-side sleeve O-ring 341 does not expand in the recess and then compress again. Furthermore, since the socket communication hole 322 is an elongated hole perpendicular to the circumferential direction of the socket-side sleeve O-ring 341, it is not wide enough for the socket-side sleeve O-ring 341 to fall in, and does not cause the socket-side sleeve O-ring 341 to get caught. In this way, the socket-side sleeve O-ring 341, which moves in a constant compressed state, does not exert any braking force on the valve body. [Explanation of Symbols] 【0036】 1 Quick Coupler 2 plugs 21 Plug-side connection body 211 O-ring for plug-side body 212 Plug-side sleeve compression spring 213 Plug-side connection path 22 Plug-side insertion body 221 Plug-side insertion protrusion 222 Plug-side restricting section 223 Plug-side intermediate flow path 23 Plug-side sleeve 231 Plug-side through hole 232 Plug-side support wall 233 Plug-side external flow path 234 Plug-side valve body compression spring 24 Plug-side valve body 241 O-ring for plug-side valve body 242 Plug-side retaining bolt 243 Plug-side retaining nut 3 sockets 31 Socket-side connection body 311 O-ring for socket body 312 Socket-side valve body compression spring 313 Socket-side connection path 32 Socket-side sleeve 321 Socket-side internal flow path 322 Socket side communication hole 33 Socket-side receiving body 331 O-ring for socket-side valve body 332 Socket-side restricting section 333 Socket side outer step 34 Socket-side valve body 341 O-ring for socket-side sleeve 342 Socket-side valve body step 4. Plug-side piping 41 Plug-side connector 5. Socket-side piping 51 Socket-side connector

Claims

[Claim 1] In a quick coupler in which a fluid shut-off mechanism is configured by a valve body that moves along a sleeve built into the plug or socket, The sleeve is movable and has multiple support walls extending in the direction of movement of the sleeve and projecting outward in the radial direction of the cross-section, sliding against the inner surface of the plug or socket, with the spaces between the support walls forming an external flow path. A quick coupler characterized by the following features. [Claim 2] The quick coupler according to claim 1, wherein the sleeve is provided with a plurality of support walls at equal intervals in the circumferential direction on its outer surface. [Claim 3] The quick coupler according to claim 1 or 2, wherein the sleeve has a semicircular cross-section for the external flow path between the support walls.

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