JP4129642B2 - Seal mechanism in coupler - Google Patents

Description

  The present invention allows each plug to be attached to a plug having a different shape connected to a dedicated pneumatic tool driven by compressed air in the normal pressure region and compressed air in a higher pressure region. The present invention relates to a seal mechanism in a coupler that supplies compressed air to each tool.

  Generally, when supplying compressed air for driving from a compressed air source such as an air compressor to the air tool side, an air hose is used to connect or disconnect between the compressed air source and the air hose or between the air hose and the air tool. In addition, a coupler disposed on the compressed air source side and a plug connected to the coupler on the air tool side are detachably attached to the coupler, whereby the compressed air supplied from the compressed air supply source is supplied to the air tool. It is trying to supply to the side. As an air working tool driven by compressed air, an air tool dedicated to normal pressure that is driven by compressed air in a normal pressure range where the working air pressure is, for example, 10 kg / cm 2 or less, and the working air pressure is higher than the pressure in the normal pressure range. A pneumatic tool dedicated to high pressure driven by compressed air in a high pressure region is used in the field. Plugs connected to the tool side to supply compressed air with a predetermined working air pressure to these dedicated tools for normal pressure and high pressure have different incompatible shapes to prevent incorrect connection. Each is used.

In the compressed air supply system in which compressed air of the working air pressure of each tool is supplied to the tool dedicated to normal pressure and the tool dedicated to high pressure, the compressed air supplied from the compressed air supply source side into the coupler. A pressure reducing valve for reducing the pressure of the air is formed. Further, a socket portion for connecting both a normal pressure plug and a high pressure plug connected to each tool is formed on the coupler. When a plug dedicated to high pressure is attached to the socket portion of this coupler, compressed air in the high pressure region supplied from the compressed air source is supplied to the tool dedicated to high pressure via the plug dedicated to high pressure, and further to the coupler socket. When a plug dedicated to normal pressure is attached to the part, the compressed air of the pressure reduced to the pressure in the normal pressure range by the pressure reducing valve formed in the coupler passes through the plug dedicated to normal pressure to the tool dedicated to normal pressure To be supplied.
JP 2003-97448 A

  The coupler socket has a sealing mechanism constituted by an O-ring housed in an annular groove which is in close contact with the outer peripheral surface of each plug when a normal pressure plug and a high pressure plug are mounted. Is formed. Since the seal portion of the high-pressure plug is formed to have a smaller diameter than the seal portion of the normal pressure plug, the seal mechanism for the high-pressure plug that is fitted and sealed with the high-pressure plug is a seal that seals the normal pressure plug. It is formed inside the mechanism. The O-rings forming these sealing mechanisms are accommodated and disposed in respective annular grooves formed on the inner peripheral surface of the annular member disposed in the socket portion.

  In the above coupler, when the high pressure plug is attached to the socket portion and compressed air in the high pressure region is supplied to the high pressure tool, the high pressure plug is removed from the O ring for the high pressure plug when the high pressure plug is detached from the socket portion. At the moment of separation, the air hose connected to the tool side and the compressed air supplied into the tool flow backward and are ejected from the tip of the high-pressure plug. In order to prevent the air hose from oscillating due to the jet output of the compressed air thus ejected from the plug tip, an opening for supplying the compressed air into the plug is directed in the radial direction at the end of the high-pressure plug. Compressed air ejected from the opening of the high-pressure plug is ejected in the radial direction, and is ejected into an annular groove in which an O-ring for sealing the normal-pressure plug is accommodated. The O-ring for sealing the pressure plug may blow out from the groove.

  Such a phenomenon may occur when the O-ring itself is softened by being exposed to high-temperature compressed air supplied to the tool, or when the pressure of compressed air supplied to the tool is high and the jet output of compressed air from the plug is high. Occurs when strong. In order to prevent such an O-ring from popping out, the width of the annular groove accommodating the O-ring is narrowed or an O-ring having a large sectional diameter is used to press-fit the O-ring into the annular groove. In this way, the holding force can be increased, but it becomes difficult for the compressed air to go around to the back side of the O-ring, and the pressing force that presses the O-ring in the inner diameter direction by the back pressure is reduced, and the sealing performance is reduced. There was a problem.

  It is an object of the present invention to solve the above-described problems in the prior art and to provide a coupler sealing structure in which a sealing member does not come off even when compressed air ejected from the tip of a high-pressure plug acts. To do.

In order to solve the above-described problems, the sealing mechanism in the coupler of the present invention has an air supply port for supplying compressed air at one end, a socket at the other end, and a tip of a plug that is detachably mounted in the socket. by being sealed connection between the inner peripheral surface of the sleeve member outer peripheral surface and the formed in the socket, a coupler to form a sealing mechanism which is adapted to supply compressed air to the plug side, the The sleeve includes an annular groove formed in a dovetail shape in which the groove width dimension of the inlet portion is smaller than the cross-sectional diameter of the O-ring and the groove width dimension of the inner portion of the annular groove is larger than this. and forming on the inner peripheral surface of the member, this dovetail groove-shaped annular groove is positioned accommodated the O-ring, and further, the inner wall of the groove bottom portion of the air supply port side than the annular groove of the annular groove Characterized in that it is configured to form an air passage is communicated with an opening to.

The invention of claim 2 is an air supply port for supplying compressed air to the one end is formed, which has a socket portion at the other end, the the tip outer peripheral surface of the plug which is detachably mounted in the socket part in the socket And a coupler that forms a seal mechanism that supplies compressed air to the plug side by being connected to the inner peripheral surface of the sleeve member formed in the cross-sectional shape. An outer peripheral surface of a plug in which one end of an annular seal member formed in a U-shape or C-shape is fixedly attached to the inner peripheral surface of the sleeve member, and a bent end of the elastic seal member is mounted in the socket portion It is configured to be closely attached to the air supply port side .

Further, the invention of claim 3, the air supply port for supplying compressed air to the one end is formed, which has a socket portion at the other end, the the tip outer peripheral surface of the plug which is detachably mounted in the socket part in the socket And a coupler that forms a seal mechanism that supplies compressed air to the plug side by being connected to the inner peripheral surface of the sleeve member formed in the seal member. An annular groove formed in a cross-sectional shape in which a shoulder portion protruding in an overhang shape toward the center of the groove width is formed at the entrance is formed on the inner circumferential surface of the sleeve member, and the outer circumferential side into the annular groove. An annular seal member having a cross-sectional shape having protrusions extending in the width direction on both side surfaces of the annular seal member is received in the annular groove so that the protrusions of the annular seal member engage with shoulders of the annular groove, and Annular groove shoulder And compressed air to the rear side of the annular seal member to the protruding portion of the annular sealing member is characterized by being configured by forming a notch to be supplied.

According to the seal structure of the present invention, the seal mechanism has an ant having a cross-sectional shape with a groove width dimension of the inlet portion smaller than the cross-sectional diameter of the O-ring and a deeper width dimension of the annular groove. An annular groove formed in a groove shape is formed on the inner peripheral surface of the sleeve member, an O-ring is accommodated in the annular groove in the dovetail groove shape, and the groove bottom portion of the annular groove is more than the annular groove. Since the air passage is formed in communication with the inner wall surface on the air supply port side , the holding force of the O-ring by the annular groove can be increased, and the high pressure plug is ejected in the radial direction. Even if the compressed air to be blown is blown into the annular groove containing the O-ring, the O-ring is not blown out by the compressed air. Further, in a state where the normal pressure plug is attached to the socket portion, the compressed air supplied to the plug is supplied to the groove bottom portion of the annular groove via the air passage, and the O-ring is pressed from the back side. The allowable range for the diameter and surface roughness of the plug is expanded and good sealing performance can be maintained.

According to the invention of claim 2, the seal mechanism is attached by fixing one end side of an annular seal member having a U-shaped or C-shaped cross section to the inner peripheral surface of the sleeve member. Since the bent inner diameter side end portion is directed to the air supply port side and is in close contact with the outer peripheral surface of the plug mounted in the socket portion, the annular seal member is compressed by the compressed air ejected from the plug. In addition, when the plug is inserted into the annular seal member, only the U-shaped or C-shaped bent part is pressed and deformed, so the insertion load of the plug can be reduced and the plug mounting operation Can be performed easily.

  According to a third aspect of the present invention, the sleeve is provided with an annular groove formed in a cross-sectional shape in which a shoulder portion protruding in an overhang shape toward the center of the groove width is formed at the entrance of the groove. An annular seal member having a cross-sectional shape formed on the inner peripheral surface of the member and having protrusions extending in the width direction on both side surfaces on the outer peripheral side into the annular groove is formed. The shoulder portion of the annular groove and the protrusion portion of the annular seal member are formed with notches so that compressed air is supplied to the back side of the annular seal member. Therefore, when the protrusion of the annular seal member engages with the shoulder of the annular groove, the compressed air ejected in the radial direction from the tip of the high-pressure plug enters the annular groove containing the annular seal member. Even when blown, the annular seal member is compressed It is not necessary to become blown out by the gas. In addition, in a state where the normal pressure plug is attached to the socket portion, the compressed air supplied to the plug is pressed from the back side of the annular seal member via the notch, so the diameter and surface roughness of the plug are not affected. The allowable range is expanded and the sealing performance can be maintained.

  The purpose of the present invention is to prevent the sealing member from being removed by the jet power of compressed air or the like even when compressed air ejected from the tip of the plug acts on the sealing member when the plug is detached from the coupler. An annular groove is formed on the inner peripheral surface of the sleeve member formed in the socket portion to which the plug is mounted so that the width dimension of the inlet portion of the groove on the inner diameter side is smaller than the diameter of the O-ring. The O-ring is accommodated and disposed in the annular groove, and an opening communicating with the groove bottom of the annular groove is opened on the inner peripheral surface of the sleeve member on the compressed air supply side. Examples will be described below.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a coupler 10 for supplying compressed air in which the seal structure of the present invention is implemented. As shown in FIG. 2, the coupler 10 is a normal pressure tool driven by compressed air in a normal pressure range. And a compressed air supply system configured to supply compressed air in the operating pressure range of each tool to a high-pressure tool driven by compressed air in a pressure range higher than the normal pressure range. In the compressed air supply system, compressed air in a high pressure region capable of driving a high pressure tool is generated by an air compressor 4 including compressors 2 and 3 driven by an electric motor 1 and stored in an air tank 5. The air tank 5 is configured by connecting at least one compressed air supply means 7 including a pressure regulator 6 and a coupler 10 to which a plug connected to the tool side is mounted. In the figure, 8 and 9 are pressure gauges for displaying the air pressure value in the air tank 5 and the pressure value adjusted by the pressure regulator 6, respectively.

  As shown in FIG. 1, an air supply port 11 connected to the pressure regulator 6 and supplied with compressed air adjusted to an arbitrary pressure from the normal pressure region to the high pressure region is provided on one end side of the coupler 10. A female socket portion 12 for receiving and mounting a plug attached to an air hose connected to the tool is formed at the opposite end of the coupler 10. The socket portion 12 is formed so that both a normal pressure plug connected to a normal pressure tool having a different shape and a high pressure plug connected to a high pressure tool can be connected. Further, the coupler 10 is blocked so as to prevent the compressed air from flowing out from the socket part 12 side when the plug is not attached to the socket part 12, and the plug is attached to the socket part 12. The two shut-off valves are formed so as to supply compressed air to the compressed air moving tool or the like through the plug.

  One shut-off valve 13 is a hollow movable cylindrical member disposed in the socket portion 12 so as to be slid by being engaged with the end face of the normal pressure plug by attaching the normal pressure plug to the socket portion 12. It is comprised by the O-ring with which the outer peripheral surface of the body 14 was mounted | worn. The movable cylindrical body 14 is slidably biased toward the socket portion 12 by a spring 15, and the O-ring 13 is normally brought into close contact with a valve seat 17 formed in the coupler housing 16 and is supplied to the air supply port 11. The side and the socket part 12 side are blocked. As shown in FIG. 3, when the atmospheric pressure plug P <b> 1 is connected to the socket portion 12, the movable cylindrical body 14 is slid against the urging force of the spring 15, and the O-ring 13 is connected to the coupler housing 16. The normal pressure plug P1 side that is separated from the valve seat 17 and is introduced into the movable cylindrical body 14 through the opening 18 formed in the peripheral wall of the movable cylindrical body 14 and attached to the socket portion 12 It is made.

The other shut-off valve 19 is formed so as to be slidable along the rod 21 disposed at the center of the coupler 10 so as to be in close contact with or separated from the open end surface of the movable cylindrical body 14. Normally, the spring 20 acting from the back side is brought into close contact with the end surface of the movable cylindrical body 14 to block the air supply port 11 side from the socket part 12 side. As shown in FIG. 4, when the high-pressure plug P <b> 2 is attached to the socket portion 12, the rod 21 is engaged with the tip of the high-pressure plug P <b> 2 to be slid, and the stopper attached to the outer periphery of the rod 21. When the ring 22 is engaged with the shutoff valve 19, the shutoff valve 19 is moved together with the rod against the pressing force of the spring 20, and is separated from the end surface of the movable cylindrical body 14 to be an air supply port. 11 side and the socket part 12 side are connected, and compressed air is conduct | electrically_connected to the high voltage | pressure plug P2 side.

A pressure reducing valve mechanism 23 is formed between the shutoff valves 13 and 19 and the air supply port 11 to reduce the pressure of compressed air in the high pressure range supplied to the air supply port 11 to a pressure in the normal pressure range. The pressure reducing valve mechanism 23 is opened and closed so as to block and flow compressed air from the air supply port 11 in the direction of the shutoff valves 13 and 19 by being in close contact with and separated from a valve seat 24 formed in the coupler housing 16. a valve 25, is slid actuated by the balance between the pressing force of the opening and closing valve 25 of the plug are arranged in side-off valve 25 of the plug tone is applied from the pressure and the back side of the compressed air side pressure spring 27 Thus, the on-off valve 25 is opened / closed to generate a pressure-reduced pressure on the plug side of the on- off valve 25.

  As shown in FIG. 3, when the normal pressure plug P <b> 1 is connected to the socket portion 12, the compressed air in the normal pressure region decompressed by the pressure reducing valve mechanism 23 passes through the shutoff valve 13 to the normal pressure plug P <b> 1. Then, it is supplied to the normal pressure plug P1. The other end side of the rod 21 that is operated in contact with the high-pressure plug P2 extends through the opening 28 formed in the center of the pressure regulating piston 26 and extends in the direction of the on-off valve 25, As shown in FIG. 4, when the high pressure plug P <b> 2 is attached to the socket part 12 and the rod 21 is slid, the tip of the rod 21 comes into contact with the opening / closing valve 25, and the opening / closing valve 25 is connected to the valve seat 24. Keep it open and away from. As a result, when the high pressure plug P2 is attached to the socket portion 12, the compressed air in the high pressure region supplied to the air supply port 11 is supplied to the high pressure plug P2 via the shut-off valve 19.

  As shown in FIG. 1, a plurality of openings 29 are formed in the circumferential wall of the coupler housing 16 that forms a socket portion 12 that receives a plug at the end of the coupler 10 and spaced in the circumferential direction. In the opening 29, a steel locking ball 30 is accommodated and disposed so as to protrude inward of the socket portion 12. This locking ball 30 advances into the socket portion 12 so that it can engage with an annular groove 31 formed on the outer peripheral surface of the plugs P1, P2 inserted into the socket portion 12. Further, an operating sleeve 32 that is slidable is provided outside the coupler housing 16 by a spring 33, and the operating sleeve 32 is slid by the urging force of the spring 33 to move inside the socket portion 12. The locking balls 30 protruding in the direction and engaged with the annular grooves 31 of the plugs P1 and P2 are locked so as not to move in the outer diameter direction, so that the plugs P1 and P2 are mounted and held in the socket portion 12.

Further, on the inner peripheral surface of the coupler housing 16, a sleeve member 34 for holding the locking ball 30 so as not to protrude inward of the socket portion 12 from a position where the locking ball 30 is retracted in the outer diameter direction slides. The annular portion at the tip of the sleeve member 34 is advanced to the inner peripheral surface side of the portion where the opening 29 of the coupler housing 16 is formed, so that the locking ball 30 is moved from the opening 29 to the socket. Protruding to the inside of the portion 12 is prevented. The sleeve member 34 is slidably biased by a spring 35 so that the tip portion is advanced to the inside of the locking ball 30.

Inside the sleeve member 34 is disposed a hollow movable cylindrical body 14 that guides compressed air to the socket portion 12 side when the shut-off valves 13 and 19 are opened. When the normal pressure plug P1 is attached to the socket portion 12, the cylindrical body 14 is brought into contact with the distal end portion of the normal pressure plug P1 to be slid. An annular groove 36 is formed on the inner peripheral surface of the front end portion of the movable cylindrical body 14, and an O-ring 37 is slidably contacted with the outer peripheral surface of the high-pressure plug P <b> 2 inserted into the socket portion 12 in the annular groove 36. The compressed air supplied to the movable cylindrical body 14 through the shut-off valve 19 is guided to the high-pressure plug P2.

A sealing mechanism 40 that forms a hermetic seal with the outer peripheral surface of the normal pressure plug P1 so as to guide the compressed air supplied into the movable cylindrical body 14 to the normal pressure plug P1 is an inner peripheral surface of the sleeve member 34. Is formed. As shown in detail in FIG. 5, the seal mechanism 40 uses an O-ring 41 that is normally used as a seal member in close contact with the outer peripheral surface of the normal pressure plug P <b> 1, and accommodates the O-ring 41. Therefore , an annular groove 42 is formed on the inner peripheral surface of the sleeve member 34. As shown in FIG. 6, the cross-sectional shape of the annular groove 42 is set such that the groove width dimension W1 of the entrance is smaller than the cross-sectional diameter D of the O-ring 41, and the groove width dimension W2 at the back of the groove. Is formed in a dovetail shape formed larger than this, and the O-ring 41 is fitted and arranged in the annular groove 42 of the dovetail shape. Furthermore, the so compressed air to the outer circumferential surface of the O-ring 41 housed in an annular groove 42 is provided, the air from the position where the annular groove 42 is formed in the sleeve member 34 a groove bottom of the annular groove 42 An air passage 43 communicating with the inner wall surface on the supply port side is formed.

Thus, by forming the cross-sectional shape of the annular groove 42 that accommodates the O-ring 41 into a dovetail shape and making the width dimension W1 of the entrance portion of the groove smaller than the diameter D of the O-ring 41, the O When the holding force of the ring 41 is increased and the high pressure plug P2 is detached from the socket portion 12 as shown in FIG. 7, the compressed air ejected in the radial direction from the tip of the high pressure plug P2 is O-ring. Even if the O-ring 41 is blown into the annular groove 42 containing the 41, it is possible to prevent the O-ring 41 from being blown out of the annular groove 42. Further, since the groove bottom portion of the annular groove 42 communicates with the inner circumferential wall surface of the sleeve member 34 closer to the air supply port than the annular groove 42, the normal pressure plug P1 is attached to the socket portion 12. In this state, the compressed air supplied to the plug P1 is supplied to the groove bottom portion of the annular groove 42 via the air passage 34 and presses the O-ring 41 from the back side. The permissible range for roughness can be expanded and good sealing performance can be maintained.

FIG. 8 shows a modified example of the sealing mechanism 40 according to the above-described embodiment, and is configured by mounting an O-ring 41 in an annular groove 42 having a dovetail shape as in the above-described embodiment. However, in this embodiment, the sleeve member 34 in which the annular groove 42 is formed is divided into two parts, that is, a part 34a arranged on the outside and a part 34b arranged on the inside, and the dovetail groove is formed. A shaped annular groove 42 is formed between these two parts. By placing the O-ring 41 between these two parts 34a and 34b and assembling both parts, the O-ring 41 is accommodated in the dovetail groove 42 and assembled. Furthermore, an opening 44 communicating with the groove bottom of the annular groove 42 is formed in the peripheral wall of the component 34b arranged on the inner side, and compressed air flows to the back side of the O-ring 41 when the normal pressure plug P1 is connected. To be supplied.

FIG. 9 shows a seal mechanism 50 according to a second embodiment of the present invention, and in this embodiment, an annular seal member 51 having a U-shaped or C-shaped cross section is used. . The annular seal member 51 is bonded to the inner peripheral wall surface of the sleeve member 34 with one end on the outer peripheral side of the annular seal member 51 so that the inner surface bent in a U-shape or C-shape faces the air supply port side. Are installed and configured. By mounting the normal pressure plug P1 on the annular seal member 51, the bent portion of the elastic seal member 51 is brought into close contact with the outer peripheral surface of the normal pressure plug P1, and the compressed air supplied to the plug P1 is annular sealed. The bent portion acting on the bent inner surface of the member 51 is brought into close contact with the outer peripheral surface of the plug P1 to be sealed.

According to this embodiment, when the normal pressure plug P1 is inserted into the annular seal member 51, only the portion bent in the U-shape or C-shape is pressed and deformed, so that the insertion load of the plug can be reduced and the plug mounting operation can be performed. Can be performed easily. Further, in the above embodiment, the annular seal member 51 bent in advance in a U-shape or C-shape is used. However, the normal pressure plug P1 is inserted into the socket portion 12 to be bent in contact with the outer peripheral surface of the plug P1. You may make it use the annular seal member made to be made. Further, in the above embodiment, the annular seal member 51 is bonded to the inner wall surface of the sleeve member 34 with an adhesive, but the end portion of the annular seal member 51 may be sandwiched and attached between two parts.

FIG. 10 shows a seal mechanism 60 according to a third embodiment of the present invention. The seal mechanism 60 in this embodiment is substantially convex with protrusions 64 projecting in the width direction on both side surfaces on the outer peripheral side. An annular groove 62 is formed on the inner peripheral surface of the sleeve member 34 so as to accommodate the annular seal member 61 formed in the cross section of the sleeve , and the annular groove 62 is directed to the groove width center at the groove entrance. Thus, it is formed in a cross-sectional shape in which a shoulder 63 protruding in an overhang shape is formed. The protrusion 64 of the annular seal member 61 accommodated in the annular groove 62 engages with the shoulder 63 of the annular groove 62, thereby preventing the annular seal member 61 from being blown out from the annular groove 62 by compressed air. Is done. Further, a notch is formed in the shoulder 63 on the air supply port side formed in the annular groove 62 and the protrusion 64 facing the air supply port side of the annular seal member 61, so that the annular seal member 61 is a normal pressure plug. When P1 is sealed and joined, compressed air is applied to the back side of the annular seal member 61, and the annular seal member 61 is brought into close contact with the peripheral surface of the plug P1 by the pressing action of the compressed air.

In any of the above embodiments, the sealing mechanism 40, 50, 60, formed on the inner peripheral surface of the sleeve member 34 which is adapted to hold the locking ball 30 to lock the plug to the mounting position to the retracted position, the sleeve The member 34 and the normal pressure plug P1 are sealed and connected, but it is not always necessary to form the seal mechanism 40, 50, 60 on the sleeve member 34, and the socket portion 12 in which the plug is attached is provided. It can be formed in the formed sleeve-like portion, and can also be implemented in a coupler or the like in which the sleeve member 34 is not formed.

Longitudinal side view of coupler implementing the sealing mechanism of the present invention Configuration diagram showing a compressed air supply system using the coupler of FIG. Longitudinal side view showing the main part of the coupler of FIG. 1 with a normal pressure plug connected Longitudinal side view showing the main part of the coupler of FIG. 1 with the high-pressure plug connected Longitudinal side view of the seal mechanism with the normal pressure plug attached FIG. 5 is an enlarged vertical side view showing an annular groove in which the O-ring of FIG. 5 is accommodated. Longitudinal side view of the coupler showing the state immediately after the high-pressure plug is removed from the socket 1 is a longitudinal side view showing a sealing mechanism according to a modified embodiment of the first embodiment. Vertical sectional side view showing a sealing mechanism according to a second embodiment of the present invention Vertical side view showing a sealing mechanism according to a third embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Coupler 12 Socket part 34 Sleeve member 40 Seal mechanism 41 O-ring 42 Annular groove 43 Air passage

Claims (3)

Air supply port for supplying compressed air to the one end is formed, which has a socket portion at the other end, of the sleeve member which is formed the tip outer peripheral surface of the plug which is detachably mounted in the socket part and in said socket A coupler that forms a seal mechanism that supplies compressed air to the plug side by being sealed to and from a peripheral surface , wherein the seal mechanism has a groove width dimension of an inlet portion that is a cross section of an O-ring. An annular groove formed in a dovetail shape formed smaller than the diameter and having a groove width dimension at the back of the annular groove larger than this is formed on the inner peripheral surface of the sleeve member. to accommodate placing the O-ring in the annular groove, further, JP that it is configured to form an air passage is communicated with the opening in the inner wall surface of the air supply port side than the annular groove of the groove bottom of the annular groove Seal mechanism in the coupler to be. Air supply port for supplying compressed air to the one end is formed, which has a socket portion at the other end, of the sleeve member which is formed the tip outer peripheral surface of the plug which is detachably mounted in the socket part and in said socket A coupler that forms a seal mechanism that supplies compressed air to the plug side by being sealed with a peripheral surface, and the cross-sectional shape of the coupler is formed in a U-shape or a C-shape. One end of the annular seal member is fixedly attached to the inner peripheral surface of the sleeve member, and the bent end of the elastic seal member is directed to the outer peripheral surface of the plug mounted in the socket portion toward the air supply port side. A seal mechanism in a coupler, characterized in that the seal mechanism is configured to be in close contact. Air supply port for supplying compressed air to the one end is formed, which has a socket portion at the other end, of the sleeve member which is formed the tip outer peripheral surface of the plug which is detachably mounted in the socket part and in said socket A coupler that forms a seal mechanism that supplies compressed air to the plug side by being sealed with a peripheral surface , the seal mechanism being directed toward the center of the groove width at the entrance of the groove An annular groove formed in a cross-sectional shape with a shoulder portion protruding in an overhang shape is formed on the inner peripheral surface of the sleeve member, and extends in the width direction on both side surfaces on the outer peripheral side into the annular groove. An annular seal member having a cross-sectional shape formed with a protrusion is accommodated in the annular groove so that the protrusion of the annular seal member engages with the shoulder of the annular groove, and further, the shoulder of the annular groove and the annular seal member Protrusion Sealing mechanisms in the coupler compressed air to the rear side of the annular seal member is characterized by being configured by forming a notch to be supplied to.

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