JP4563846B2 - Residual pressure release valve - Google Patents

Description

  According to the present invention, by rotating a knob provided in the casing, the knob discharges the pressure air on the pneumatic device side from the supply position that enables the pressure air to be supplied from the pressure air source to the pneumatic device. The present invention relates to a residual pressure discharge valve configured to be able to take a discharge position.

  Conventionally, a residual pressure discharge valve has been provided between the pressure air source and the pneumatic device to shut off the pressure air supplied from the pressure air source and to discharge the pressure air (residual pressure) on the pneumatic device side. (For example, refer to Patent Document 1). This residual pressure discharge valve has a position in which pressure air can be supplied from the pressure air source to the pneumatic equipment by moving the valve body accommodated in the casing by rotating the knob, and the pressure air on the pneumatic equipment side. It is possible to switch to a position that allows the discharge of water.

  Also, recently, the residual pressure discharge valve has been installed in order to prevent accidental operation of the knob during discharge of compressed air on the pneumatic equipment side and supply of pressurized air from the pressurized air source to the pneumatic equipment. Means are taken to prevent operation of the knob during discharge of pressurized air. The means for preventing the knob operation is performed by locking the knob by an administrator. In order to lock the knob, the casing of the residual pressure discharge valve is provided with two key holes facing each other so as to sandwich the knob. Even if the casing is inverted 180 degrees so that the air supply port and the connection port of the casing correspond to the arrangement of the pressure air source and the pneumatic equipment, one key hole is always located on the work side of the manager As shown, two key holes are provided.

On the other hand, the knob has only one key hole. When the knob is rotated when discharging the compressed air, one of the two key holes of the casing (the key hole located on the manager's work side) matches the key hole of the knob. At this time, the other keyhole of the casing remains open. Then, the manager locks the knob by attaching a padlock to the key hole of the casing and the key hole of the knob.
Japanese Utility Model Publication No. 57-49954

  Generally, one padlock is attached to one residual pressure control valve, and the number of prepared padlocks also matches the number of residual pressure control valves. However, in the residual pressure discharge valve in which the casing is provided with two key holes, both the key holes of the casing are opened when the pressure air is discharged. For this reason, in a state where the knob is rotated for discharging the pressure air, the administrator may attach the padlock to the keyhole of the casing that does not match the keyhole of the knob. In addition, there is a possibility that the padlock may be accidentally attached to the key hole of another casing although the padlock is attached to the key hole of the casing and the key hole of the knob. In this case, the administrator may mistakenly assume that padlocks are attached to all residual pressure discharge valves and that all the residual pressure discharge valves have discharged pressure air because all padlocks have been lost. It was.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to provide a residual pressure discharge valve capable of preventing the occurrence of inconvenience when discharging pressurized air. There is to do.

  In order to solve the above problems, the invention according to claim 1 enables the supply of pressure air from a pressure air source to a pneumatic device by rotating the knob provided in the casing. A residual pressure discharge valve configured to be capable of taking a supply position for discharging and a discharge position for discharging the pressure air on the pneumatic equipment side, wherein the casing has two casing-side key holes through the knob. The knobs are formed opposite to each other, and the knob does not match the two casing-side keyholes at the supply position, but matches one of the two casing-side keyholes at the discharge position. A knob-side keyhole is formed, and the knob is provided with a closing portion that closes a casing-side keyhole that does not match the knob-side keyhole in conjunction with rotation of the knob from the supply position to the discharge position. This is the gist.

The gist of a second aspect of the present invention is the residual pressure discharge valve according to the first aspect, wherein the closing portion is formed by a projecting piece provided on the knob.
A third aspect of the present invention is the residual pressure discharge valve according to the first or second aspect, wherein the closing portion is integrally formed with the knob.

  According to a fourth aspect of the present invention, in the residual pressure discharge valve according to any one of the first to third aspects, the casing closes two casing-side keyholes at the supply position. The gist is that a pair of closing portions are further provided.

  According to a fifth aspect of the present invention, the knob provided on the casing is rotated, so that the knob can be supplied with pressure air from the pressure air source to the pneumatic equipment, and the pneumatic equipment side A residual pressure discharge valve configured to be capable of taking a discharge position for discharging the pressure air of the casing, wherein the casing has two casing-side key holes formed opposite to each other via the knob. , Two slide members for separately closing the two casing side keyholes in the supply position are provided, and any one of the two slide members is rotated from the supply position to the discharge position. The gist is that the casing side keyhole is slid and moved in conjunction with the movement.

  According to a sixth aspect of the present invention, in the residual pressure discharge valve according to the fifth aspect, the knob is formed with a locking portion that is locked to one slide member that opens the casing-side keyhole, The gist is that the locking portion is locked to the slide member in conjunction with the rotation of the knob.

  According to a seventh aspect of the present invention, in the residual pressure discharge valve according to the fifth or sixth aspect, the casing is formed with a slide groove that converts the rotary motion of the knob into a linear motion of the slide member. It is a summary.

  According to the present invention, it is possible to prevent the occurrence of inconvenience when discharging pressurized air.

(First embodiment)
Hereinafter, a first embodiment embodying a residual pressure discharge valve of the present invention will be described with reference to FIGS. In the following description, “upper” and “lower” refer to the direction of the arrow Y1 shown in FIG.

  As shown in FIG. 1, the residual pressure discharge valve 11 includes a casing 12 having a rectangular tube shape. A spool valve (not shown) for switching the flow path of the pressure air is provided inside the casing 12. The spool valve is accommodated in the casing 12 so as to be reciprocally movable in the vertical direction of the casing 12.

  An air supply port 26 is formed in the casing 12 (see FIGS. 3 to 5). A primary side air circuit 15 is connected to the air supply port 26, and a pressure air source 14 for supplying the pressure air is connected to the primary side air circuit 15. A connection port 16 is formed in the casing 12 so as to face the air supply port 26 (see FIGS. 1 to 5). A secondary air circuit 18 is connected to the connection port 16, and a pneumatic device (for example, an air cylinder) 17 to which the pressurized air is supplied is connected to the secondary air circuit 18. An exhaust port 19 is formed on the lower surface of the casing 12 (see FIGS. 1 and 2). The exhaust port 19 is formed in the casing 12 in order to discharge the pressure air from the secondary air circuit 18 to the atmosphere and to discharge the pressure air (residual pressure) in the pneumatic device 17.

  In the residual pressure discharge valve 11, the casing 12 is provided with a knob 13 for moving the spool valve. The knob 13 is connected to the spool valve. The knob 13 is provided in the casing 12 so as to be rotatable by 90 degrees in the direction of the arrow Y2 shown in FIG. 3, and the spool valve is moved up and down in the casing 12 by rotating the knob 13.

  The residual pressure discharge valve 11 communicates the supply port 26 and the connection port 16 by rotating the knob 13 (clockwise in the direction of arrow Y2) to move the spool valve. That is, the pressure air source 14 and the primary side air circuit 15, the secondary side air circuit 18 and the pneumatic device 17 are communicated with each other via the residual pressure discharge valve 11, and the pressure air is supplied from the pressure air source 14 to the pneumatic device 17. It has become so. The position of the knob 13 where the air supply port 26 and the connection port 16 communicate with each other is defined as a supply position.

  On the other hand, as shown in FIG. 5, the residual pressure discharge valve 11 is operated by rotating the knob 13 at the supply position by 90 degrees (counterclockwise direction of the arrow Y2) to move the spool valve. The communication between the connection port 16 and the connection port 16 is blocked, and the connection port 16 and the exhaust port 19 are communicated with each other. That is, the supply of the pressure air to the pneumatic device 17 is shut off by the residual pressure discharge valve 11, and the pressure air in the air circuit (secondary air circuit 18 and pneumatic device 17) is discharged from the exhaust port 19 to the atmosphere. It has become so. The communication between the air supply port 26 and the connection port 16 is cut off, and the position of the knob 13 where the connection port 16 and the exhaust port 19 communicate with each other is defined as a discharge position.

  As shown in FIGS. 3 to 5, two casing-side keyholes 20 a are formed on the casing 12 on the side where the knob 13 is disposed (upper side). The two casing-side key holes 20a are formed to face each other with the knob 13 interposed therebetween. Further, in the casing 12, a part of the padlock N as a key that communicates with the casing side key hole 20a and is locked to the casing side key hole 20a can be accommodated below the casing side key hole 20a. A housing recess 20b is formed.

  The knob 13 is formed with a pair of handle portions 13a facing each other. Further, on the casing 12 side (lower side) of the knob 13, a first projecting piece 21, a second projecting piece 22, a third projecting piece 23, and a fourth projecting piece extending in a plate shape along the peripheral surface of the knob 13. 24 is integrally formed. These first to fourth projecting pieces 21 to 24 are formed at equal intervals along the circumferential direction of the knob 13. That is, in the first to fourth projecting pieces 21 to 24, adjacent projecting pieces are formed at positions shifted by 90 degrees along the circumferential direction of the knob 13.

  The first projecting piece 21 and the third projecting piece 23 face each other with the knob 13 interposed therebetween, and the second projecting piece 22 and the fourth projecting piece 24 face each other with the knob 13 interposed therebetween. A knob-side keyhole 25 is formed in the first projecting piece 21 which is one of the first to fourth projecting pieces 21 to 24 so as to penetrate the first projecting piece 21, and the other second to second projecting pieces. No knob side key hole 25 is formed in the four projecting pieces 22 to 24.

  As shown in FIG. 3, when the knob 13 is rotated to the supply position, the first to fourth projecting pieces 21 to 24 are interlocked with the rotation of the knob 13, and the second projecting piece 22 and the fourth projecting piece 24 are respectively casings. It is rotationally moved to a position overlapping the upper side of the side keyhole 20a. On the other hand, as shown in FIG. 5, when the knob 13 is rotated from the supply position to the discharge position, the first to fourth projecting pieces 21 to 24 are interlocked with the rotation of the knob 13, and the third projecting piece 23 is the knob side key. It is rotationally moved to a position overlapping the upper side of the casing side key hole 20a that does not match the hole 25. And the 2nd-4th protrusions 22-24 are formed in the knob 13 as a closing part.

  The knob 13 can be removed from the spool valve, and can be attached to the spool valve after being rotated 180 degrees from the state before being removed from the spool valve. For example, a wall (not shown) is erected on the upper side of the residual pressure discharge valve 11 in FIG. 3 (the wall side shown in FIG. 3), and the lower side of the residual pressure discharge valve 11 (on the work side shown in FIG. 3). Is the working side where the operator operates the knob 13. Then, as shown in FIG. 4, it is assumed that the arrangement positions of the pressure air source 14 and the pneumatic device 17 are reversed by 180 degrees, and the installation direction of the residual pressure discharge valve 11 is reversed accordingly. In this case, the knob 13 is rotated 180 degrees so that the knob 13 can be locked using the casing side keyhole 20a located on the working side (lower side in FIG. 4) instead of the wall side (upper side in FIG. 4). And attached to the spool valve.

  Now, in the residual pressure discharge valve 11 having the above-described configuration, as shown in FIG. 3, the knob 13 is rotated and positioned at the supply position. Then, the pressure air source 14 and the primary side air circuit 15, the secondary side air circuit 18 and the pneumatic device 17 are communicated with each other via the residual pressure discharge valve 11, and the pressure air is supplied to the pneumatic device 17. At this time, one (working side) casing side keyhole 20a of the two casing side keyholes 20a is closed by the second projecting piece 22, and the other (wall side) casing side keyhole 20a is the first. The four projecting pieces 24 are closed.

  The first projecting piece 21 is disposed at a position not corresponding to the two casing side key holes 20a (an intermediate position between the two casing side key holes 20a along the circumferential direction of the knob 13). Does not match any casing-side keyhole 20a. For this reason, when the knob 13 is in the supply position and the compressed air is supplied to the pneumatic device 17, the padlock N is prevented from being locked in the two casing-side key holes 20a.

  On the other hand, as shown in FIG. 5, when the pressurized air is discharged, the knob 13 at the supply position is positioned at the discharge position. Then, the communication between the air supply port 26 and the connection port 16 is blocked by the residual pressure discharge valve 11, and the connection port 16 and the exhaust port 19 are connected to discharge the pressurized air from the secondary air circuit 18 and the pneumatic device 17. . At this time, the first to fourth projecting pieces 21 to 24 rotate in conjunction with the rotation of the knob 13. Then, the closing of the casing-side keyhole 20a by the second and fourth projecting pieces 22 and 24 is released, and the first projecting piece 21 is disposed above the casing-side keyhole 20a located at the rotational movement destination of the knob 13. The As a result, the knob-side key hole 25 and the casing-side key hole 20a on the working side are matched, and the knob 13 is locked by attaching the padlock N to the knob-side key hole 25 and the casing-side key hole 20a. At this time, a part of the padlock N is accommodated in the accommodating recess 20b.

  Further, when the knob 13 is in the discharging position, the third projecting piece 23 opposite to the first projecting piece 21 sandwiching the knob 13 is disposed above the other casing side keyhole 20a (wall side), The casing side keyhole 20 a is closed by the third protrusion 23. Therefore, when discharging the pressure air of the secondary side air circuit 18 and removing the residual pressure, the knob 13 can be locked to prevent the knob 13 from rotating, and at the same time, another casing side keyhole 20a can be provided. Can be closed. That is, when the pressurized air is discharged, only one casing-side key hole 20a that allows the knob 13 to be locked is opened to prevent the knob 13 from rotating, and the other casing-side key hole 20a is closed to close both casing-side keys. The holes 20a are not opened simultaneously.

According to the above embodiment, the following effects can be obtained.
(1) The knob 13 is formed with a knob-side keyhole 25 and a third protrusion 23. When the knob 13 is rotated to the discharging position, the knob side keyhole 25 matches one casing side keyhole 20a in conjunction with the rotation of the knob 13, and the third projecting piece 23 matches the knob side keyhole 25. Another casing side keyhole 20a that is not to be closed is closed. That is, it is possible to eliminate the simultaneous opening of the two casing-side keyholes 20a when the pressurized air is discharged. As a result, when the knob 13 is rotated to the discharge position, the manager of the padlock N can be prevented from attaching the padlock N to the casing-side keyhole 20a that does not match the knob-side keyhole 25. It is possible to prevent the occurrence of inconvenience at the time of discharging.

  (2) Further, when the pressurized air is discharged, the casing-side keyhole 20 a that does not match the knob-side keyhole 25 is closed by the third projecting piece 23. For this reason, if the padlock N is attached to the casing-side keyhole 20a that matches the knob-side keyhole 25, it becomes impossible to attach another padlock N to the residual pressure discharge valve 11, and the administrator can use one residual pressure discharge valve. It is possible to eliminate attaching two padlocks N to 11. As a result, since the manager has lost all the padlocks N, the padlocks N are attached to all the residual pressure discharge valves 11 (that is, the residual pressure discharge valves 11 provided in the factory equipment), and all the residual pressures are removed. It is possible to eliminate the misunderstanding that the pressure air is discharged by the discharge valve 11, and it is possible to prevent the occurrence of inconvenience when the pressure air is discharged.

  (3) Further, when the pressurized air is supplied, the two casing-side key holes 20 a are closed by the second projecting piece 22 and the fourth projecting piece 24. For this reason, when the pressurized air is supplied, there is no open casing-side keyhole 20a, and the padlock N can be prevented from being attached to the casing-side keyhole 20a. As a result, since the padlock N is attached to the residual pressure discharge valve 11 in spite of the supply of the pressure air, it is possible to prevent the occurrence of inconvenience that may be mistaken for the discharge of the pressure air. .

  (4) The second to fourth projecting pieces 22 to 24 are formed in a plate shape. For this reason, the second to fourth projecting pieces 22 to 24 are lightweight and small, and do not hinder the rotation of the knob 13. Therefore, even if the residual pressure discharge valve 11 has a configuration for closing the casing-side keyhole 20a, the configuration of the residual pressure discharge valve 11 is not complicated or enlarged.

  (5) Since the first to fourth projecting pieces 21 to 24 are integrally formed with the knob 13, the first to fourth projecting pieces 21 to 24 can be reliably moved simultaneously with the rotation of the knob 13. Therefore, the casing-side keyhole 20a and the knob-side keyhole 25, and the casing-side keyhole 20a and the third projecting piece 23 can be reliably matched by the rotation of the knob 13. Compared with the case where the first to fourth projecting pieces 21 to 24 are formed separately from the knob 13 and interlocked with the rotation of the knob 13, the cooperation between the knob 13 and the first to fourth projecting pieces 21 to 24 is achieved. The structure can be simplified, and the structure of the residual pressure discharge valve 11 can be simplified.

  (6) The first to fourth projecting pieces 21 to 24 are formed every 90 degrees along the circumferential direction of the knob 13. For this reason, the knob side keyhole 25 can be matched with one casing side keyhole 20a only by rotating the knob 13 90 degree | times, and the other casing side keyhole 20a can be closed by the 3rd protrusion piece 23. FIG.

  (7) First to fourth projecting pieces 21 to 24 are formed in the knob 13, and a knob-side keyhole 25 is formed in one first projecting piece 21. Therefore, even if the knob 13 is rotated 180 degrees and attached to the spool valve, at the time of discharging, the knob-side key hole 25 is matched with the one casing-side key hole 20a and the other casing-side key hole 20a is moved by the third protrusion 23. Both casing side keyholes 20a can be closed by the first and fourth projecting pieces 21 and 24 when pressurized air is supplied.

(Second Embodiment)
Next, a second embodiment in which the residual pressure discharge valve of the present invention is embodied will be described with reference to FIGS. In addition, since 2nd Embodiment is the structure which changed the knob 13 of 1st Embodiment and added the slide member 30, the overlapping description is abbreviate | omitted about the same part.

  As shown in FIGS. 6 and 7, the first slide member 30 and the second slide member 31 are arranged between the lower surface of the knob 13 and the upper surface of the casing 12 so as to sandwich the rotation center (rotation axis) of the knob 13. It is installed. As shown in FIGS. 8A and 8B, the first and second slide members 30 and 31 each have a rectangular plate shape, and the first and second slide members 30 and 31 have through holes 32. Is formed. Further, the first and second slide members 30 and 31 are provided with two locking pieces 33 extending in the short side direction of the slide members 30 and 31 so as to face each other. Hereinafter, the locking piece 33 on the side of the through hole 32 is referred to as a first locking piece 33a, and the locking piece 33 facing the first locking piece 33a is referred to as a second locking piece 33b.

  As shown in FIGS. 6 and 7, on the lower surface of the knob 13, one locking portion (protruding shape) 35 that can be locked to the first and second locking pieces 33 a and 33 b is directed toward the casing 12. Projected. Further, only the first projecting piece 21 is formed integrally with the knob 13, and a knob side key hole 25 is formed in the first projecting piece 21. On the upper surface of the casing 12, slide grooves 36 are respectively provided on the air supply port 26 side and the connection port 16 side. Each slide groove 36 is formed so as to extend in a direction perpendicular to the flow direction of the pressurized air from the supply port 26 to the connection port 16.

  The first slide member 30 is disposed on the upper surface of the casing 12 on the air supply port 26 side so that the long side direction extends in a direction orthogonal to the flow direction of the pressurized air. The first slide member 30 moves relative to the casing 12 by fixing the fixing screw B from the through hole 32 to the slide groove 36 with one of the two casing side key holes 20a (wall side) closed. Is regulated. In this movement restricted state, the first and second locking pieces 33a and 33b protrude to the knob 13 side.

  On the other hand, on the upper surface of the casing 12 and on the connection port 16 side, the second slide member 31 is disposed so that its long side direction extends in a direction orthogonal to the flow direction of the pressurized air. The second slide member 31 is disposed in the casing 12 in a state in which the screw portion of the mounting screw 37 fixed to the through hole 32 is inserted into the slide groove 36. In this arrangement state, the first and second locking pieces 33a and 33b protrude to the knob 13 side. An engaging portion 35 formed on the knob 13 can be engaged with the first and second engaging pieces 33a and 33b.

  When the knob 13 is rotated, the locking portion 35 is locked to the first locking piece 33 a or the second locking piece 33 b of the second slide member 31 in conjunction with the rotation of the knob 13 and the locking piece 33. Is to be pressed. Then, the second slide member 31 slides along the extending direction of the slide groove 36 as the screw portion of the mounting screw 37 moves along the slide groove 36. In other words, the rotary motion of the knob 13 is converted into the linear motion of the second slide member 31 by the slide groove 36. The second slide member 31 that opens and closes the casing-side keyhole 20 a located on the working side among the two slide members 30 and 31 slides in conjunction with the rotation of the knob 13.

  Now, as shown in FIG. 6, when the knob 13 is rotationally moved to the supply position, the locking portion 35 is locked to the second locking piece 33b and pressed, and one second slide member 31 (working side) is pressed. ) Is slid toward the casing side keyhole 20a. Then, one casing side keyhole 20a is closed by the second slide member 31. At this time, since the movement of the first slide member 30 relative to the casing 12 is restricted by the fixing screw B, the second slide member 31 can be slid in conjunction with the rotation of the knob 13. The casing side keyhole 20a is kept closed. That is, when the knob 13 is in the supply position, the two casing-side keyholes 20 a are separately closed by the first slide member 30 and the second slide member 31. The knob side keyhole 25 does not match any of the two casing side keyholes 20a.

  On the other hand, as shown in FIG. 7, when the knob 13 is rotated from the supply position to the discharge position, the locking portion 35 is locked to the first locking piece 33a and the second slide member 31 is moved to the casing side keyhole. It is slid in a direction away from 20a. Then, when the second slide member 31 slides, one casing side key hole 20a located on the working side is opened, and the knob side key hole 25 matches the casing side key hole 20a.

  That is, the second slide member 31 slides in a direction to open the casing-side keyhole 20a that matches the knob-side keyhole 25 at the discharge position in conjunction with the rotation of the knob 13 from the supply position to the discharge position. . And the 2nd slide member 31 closed the casing side keyhole 20a which corresponds with the knob side keyhole 25 in the discharge position in the said supply position. Then, the padlock N is attached to the opened casing side key hole 20a and the knob side key hole 25, and the knob 13 is locked. That is, the knob side keyhole 25 matches the casing side keyhole 20a at the discharge position in order to prevent the knob 13 from rotating.

  Also at this time, since the movement of the first slide member 30 with respect to the casing 12 is restricted by the fixing screw B, even if the second slide member 31 is slid in conjunction with the rotation of the knob 13, another one ( The wall side) casing side keyhole 20a is kept closed.

  In addition, the movement of the second slide member 31 with respect to the casing 12 is restricted by the fixing screw B, the attachment screw 37 is attached to the first slide member 30, and the screw portion of the attachment screw 37 is connected to the slide groove 36. Insert into. Then, the first slide member 30 can be slid in conjunction with the rotation of the knob 13, while the second slide member 31 can be fixed to the casing 12.

  Therefore, according to the residual pressure discharge valve 11 of the second embodiment, the arrangement of the first slide member 30 and the second slide member 31 with respect to the casing 12 is changed, whereby the pressure air source 14 and the pneumatic device 17 are changed. The slide members 30 and 31 that are slidably moved according to the change of the arrangement position, the installation position of the residual pressure discharge valve 11 and the like can be used properly. As a result, the configuration of the residual pressure discharge valve 11 can be simplified as compared with the case where slide members having different shapes are provided to perform each function.

In addition, you may change this embodiment as follows.
In the first embodiment, the second projecting piece 22 and the fourth projecting piece 24 may be deleted, and only the first projecting piece 21 and the third projecting piece 23 may be formed on the knob 13.

  In the first embodiment, the first to fourth projecting pieces 21 to 24 are separately formed on the knob 13, but the flange that extends along the entire circumferential direction of the knob 13 is outward on the lower side of the knob 13. The knob side keyhole 25 may be formed in the collar portion. When the knob 13 is located at the supply position, the knob-side keyhole 25 is not aligned with the casing-side keyhole 20a. When the knob 13 is located at the discharge position, the knob-side keyhole 25 is placed on one casing side. You may make it match only with the keyhole 20a.

  -In 2nd Embodiment, the latching | locking part 35 is formed in the 1st slide member 30 and the 2nd slide member 31, and the 1st latching piece 33a and 2nd latching which can be latched to the latching | locking part 35 in the knob 13 are carried out. The stop piece 33b may be formed. Then, by rotating the knob 13, the first locking piece 33 a or the second locking piece 33 b of the knob 13 is locked to the locking portion 35 of the first slide member 30 or the second slide member 31 and is slid. Also good.

  -In 2nd Embodiment, if the casing side keyhole 20a which the knob side keyhole 25 corresponds can be closed in the discharge | emission position of the knob 13, even if the slide movement of the 2nd slide member 31 is not a linear movement, For example, the sliding movement may be performed along the rotation direction of the knob 13.

  -In 2nd Embodiment, you may delete the 1st protrusion 21 from the knob 13, and delete the knob side keyhole 25. FIG. Then, the second slide member 31 is slid in conjunction with the rotation of the knob 13, and the padlock N is attached only to the casing side keyhole 20a in a state where the casing side keyhole 20a located on the work side is opened. When configured in this way, the second slide member 31 contacts the padlock N even if the knob 13 is to be rotated. For this reason, when the slide movement of the second slide member 31 is restricted, the knob 13 cannot be rotated, and the knob 13 can be prevented from rotating.

In the second embodiment, the residual pressure discharge valve 11 may be configured such that the first slide member 30 and the second slide member 31 are embedded in the casing 12.
The first to fourth projecting pieces 21 to 24 may be formed separately from the knob 13 so as to be detachable from the knob 13.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(1) A knob side keyhole is formed in the knob, and the knob side keyhole does not coincide with the two casing side keyholes at the supply position, and the slide member slides at the discharge position. The residual pressure discharge valve according to any one of claims 5 to 7, wherein the residual pressure discharge valve is formed at a position that matches the opened casing-side keyhole.

  (2) Of the two slide members, the slide member that opens the casing-side keyhole at the discharge position slides in conjunction with the rotation of the knob, and the other slide member is restricted from moving relative to the casing. The residual pressure discharge valve according to any one of claims 5 to 7 and the technical idea (1), wherein the casing keyhole is always closed.

The perspective view which shows the state which attached the padlock to the residual pressure discharge valve of 1st Embodiment. The perspective view which shows the residual pressure discharge valve of 1st Embodiment. The top view which shows the residual pressure discharge valve in a supply position. The top view which shows the state which reversed the residual pressure discharge valve. The top view which shows the residual pressure discharge valve in a discharge position. The top view which shows the residual pressure discharge valve in a supply position in 2nd Embodiment. The top view which shows the residual pressure discharge valve in a discharge position in 2nd Embodiment. (A) is a top view which shows a slide member, (b) is a side view which shows a slide member.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Residual pressure discharge valve, 12 ... Casing, 13 ... Knob, 14 ... Pressure air source, 17 ... Pneumatic equipment, 20a ... Casing side key hole, 25 ... Knob side key hole, 22, 23, 24 ... As a closed part 2nd-4th protrusion, 30, 31 ... The 1st and 2nd slide member as a slide member, 35 ... Locking part, 36 ... Slide groove.

Claims (7)

By rotating a knob provided on the casing, the knob is provided with a supply position that enables the supply of pressure air from the pressure air source to the pneumatic equipment, and a discharge position that discharges the pressure air on the pneumatic equipment side. A residual pressure discharge valve configured to take
Two casing-side keyholes are formed in the casing so as to face each other via the knob, and the knob does not match the two casing-side keyholes in the supply position, and is in the discharge position. A knob-side keyhole that matches any one of the two casing-side keyholes is formed,
Residual pressure discharge, wherein the knob is provided with a closing portion for closing a casing-side keyhole that does not match the knob-side keyhole in conjunction with rotation of the knob from the supply position to the discharge position. valve. The residual pressure discharge valve according to claim 1, wherein the closing portion is formed by a projecting piece provided on the knob. The residual pressure discharge valve according to claim 1 or 2, wherein the closing portion is integrally formed with the knob. The residual pressure discharge valve according to any one of claims 1 to 3, wherein the knob is further provided with a pair of closing portions for closing two casing-side key holes at the supply position. By rotating a knob provided on the casing, the knob is provided with a supply position that enables the supply of pressure air from the pressure air source to the pneumatic equipment, and a discharge position that discharges the pressure air on the pneumatic equipment side. A residual pressure discharge valve configured to take
The casing is provided with two casing-side keyholes facing each other via the knob, and two slide members are provided for separately closing the two casing-side keyholes at the supply position. The residual pressure discharge is characterized in that any one of the two slide members is slid in a direction to open the casing side keyhole in conjunction with rotation of the knob from the supply position to the discharge position. valve. The locking part is formed in the knob to be locked to one slide member that opens the casing side keyhole, and the locking part is locked to the slide member in conjunction with rotation of the knob. 5. The residual pressure discharge valve according to 5. The residual pressure discharge valve according to claim 5 or 6, wherein a slide groove for converting the rotary motion of the knob into a linear motion of the slide member is formed in the casing.

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