JPH0642078U - Relief valve in fluid driven equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a relief valve for a fluid drive device which is easy to assemble, does not require cutting work, and has a small number of parts. A hollow valve accommodating portion is formed on an inner surface of a continuous wall forming an accumulator and has a substantially double-ended opening and extends to an opening of the accumulator. A shoulder portion facing the opening is provided at the inner end of the valve accommodating portion.
The relief valve further includes a cap that closes the opening of the accumulator and has a through hole that is continuous with the outer end opening of the valve accommodating portion and extends in the axial direction of the valve accommodating portion, and the inner end of the shoulder portion of the valve accommodating portion. A tubular valve casing that is open at both ends and has an outer end abutting the inner end surface of the cap, and a stem-shaped valve body inside the valve casing that is located on the innermost side of the valve casing. A valve body whose end is closed and whose outer end is arranged to be able to move in and out of the through hole, and a compression coil spring which sets a relief pressure, is arranged around the valve body and whose outer end is in contact with the inner end surface of the cap. And a compression coil spring whose inner end is supported by the valve body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a relief valve provided in an accumulator in a fluid driven device.

[0002]

[Prior art and its problems]

 BACKGROUND ART Conventionally, a pneumatic nailing machine (hereinafter, referred to as a nailing machine) that uses compressed air as a power source has been used as a fluid drive type device incorporating an accumulator. This nailer has a nailer housing with a generally T-shaped profile. The nailing machine housing is composed of a main housing portion corresponding to a T-shaped horizontal bar that houses the striking piston / cylinder mechanism, and a grip portion corresponding to a T-shaped vertical bar. Almost the entire grip part constitutes an accumulator, and a cast cap is attached to the rear end. The cap is equipped with an air plug connected to the tip of the hose extending from a compressed air source existing outside the nailer, and a relief valve for keeping the air pressure in the accumulator within a safe range. ing.

A boss projecting into and out of the accumulator is provided in the center of the cap, and a valve accommodating hole formed by a casting method for accommodating a relief valve that is opened into the accumulator is formed in the inward projecting portion of the boss. In addition, a threaded hole formed by a cutting method for screwing the air plug is formed on the outer protruding portion of the boss. In this way, since the relief valve and the air plug are centrally arranged on the boss of the cap, the relief valve and the atmosphere communicating hole and the air plug and the accumulator communicating hole are respectively connected to the relief valve and the air plug. In order to avoid the interference of the, it must be machined so as to be oblique to the longitudinal axis of the cap. In addition, in order to fix the relief valve to the valve accommodating hole, the spring pin must be driven in the lateral axis of the inward protruding portion of the boss. As described above, the relief valve according to the related art has the drawbacks that the cap needs to be cut, it is difficult to assemble, and the number of parts is large.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to provide a relief valve for a fluid drive device which is easy to assemble, does not require cutting work, and has a small number of parts.

[0005]

[Means for Solving the Problems]

 The present invention is a relief valve in a fluid-driven device in which an opening provided on a continuous wall forming an accumulator is closed by a cap, and the inner surface of the wall has a substantially double-ended open tubular shape. A hollow valve accommodating portion extending to the opening of the accumulator, the valve accommodating portion having a shoulder portion opposite to the accumulator opening at its inner end, and the accumulator opening closed on the wall. A cap having a through hole that is continuous with the outer end opening of the valve accommodating portion and extends in the axial direction of the valve accommodating portion; A tubular valve casing that is open at both ends that abuts the inner end face, and a system-shaped valve body that is axially movable inside the valve casing. And a valve body whose outer end is arranged to be able to move in and out of the through hole, and a compression coil spring which sets a relief pressure, the outer end being arranged around the valve body and the outer end contacting the inner end surface of the cap. The inner end is composed of a compression coil spring supported by the valve body.

[0006]

[Operation and effect of the device]

 Prior to fixing the cap to the opening of the accumulator, the valve casing is brought into contact with the shoulder of the valve accommodating portion, and the valve body and the compression coil spring are assembled to the valve casing. Therefore, by fixing the cap to the wall of the accumulator, the outer end opening of the valve casing and the outer end of the compression coil spring come into contact with the inner end surface of the cap, and the outer end of the valve body comes into the through hole of the cap. When inserted, the relief valve is fully assembled. As described above, the relief valve in the fluid-driven device of the present invention is easy to assemble, does not require cutting of the cap, and has a small number of parts.

[0007]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 2, a pneumatic nailer equipped with a relief valve according to an embodiment of the present invention mainly comprises a nailer housing 1 having a substantially L-shaped profile and a nailer. A striking cylinder / piston mechanism 3 arranged and fixed coaxially with the main housing part 2 in a main housing part 2 formed as a front part of the housing 1, and a striking cylinder / piston fixed to the lower end of the main housing part 2. A nose unit 4 that extends coaxially with the mechanism 3 and ejects a nail, a driver 6 that extends as a piston rod of a striking piston 5 and reciprocates in the nose unit 4, and a striking cylinder and a striking cylinder arranged at the upper end of the piston mechanism 3. The head valve 7 that controls the inflow of compressed air into the piston mechanism 3 and the exhaust from the striking cylinder / piston mechanism 3 and the upper end of the main housing portion 2 are closed. A housing cap 8 forming a part of the head valve 7, and a trigger valve 10 provided below the boundary between the grip portion 9 of the nailing machine housing 1 and the main housing portion 2 for controlling opening / closing of the head valve 7. And a trigger 11 that is pivotally supported on the outer wall surface of the main housing part 2 for the operator to manually operate the trigger valve 10, and the contact plate inside the nose unit 4 is mechanically related to the trigger 11. The contact arm unit 12 that reciprocates in the axial direction and a large number of nails fixed to the rear side wall surface of the nose unit 4 and extending rearward and substantially parallel to the grip portion 9 (especially, the diameter of the head is equal to the diameter of the shank portion). On the other hand, a magazine unit 13 for loading sheet-like connecting nails, in which finishing nails of a slightly larger size) are juxtaposed in parallel and joined together without a gap. Hereinafter, each part and its related parts will be described in detail.

Nailer Housing: The nailer housing 1 comprises a main housing part 2 and a grip part 9. The inside of the grip part 9 is integrated with a part of the inside of the main housing part 2 and the inside of the housing cap 8 to form an accumulator or a compressed air storage chamber 14 surrounding the upper part of the striking cylinder / piston mechanism 3. A vertical partition wall 15 extending in the longitudinal direction of the main housing portion 2 is provided at a boundary portion between the main housing portion 2 and the grip portion 9 in a lower portion inside the main housing portion 2. An oval shoulder 16 is formed in the axially intermediate portion of the inner wall surface of the main housing portion 2 including the vertical partition wall 15. The cylinder ring 17 is laterally fixed while being mounted on the shoulder portion 16, and laterally positions the striking cylinder 18.

On the cylinder ring 17, a rubber-made oval lateral partition wall / check valve unit 19 is mounted. The horizontal partition / check valve unit 19 is fixed in the longitudinal direction of the main housing portion 2 by a spacer 20 and a cylinder ring 17 which are fitted onto the striking cylinder 18. The horizontal partition / check valve unit 19 includes a relatively thick horizontal partition 19a and a check valve 19b that is thinner than the horizontal partition 19a and is provided on the inner circumference of the horizontal partition 19a. Become. The horizontal partition wall 19a closes and seals between the compressed air storage chamber 14 and the blowback compressed air storage chamber 21 formed inside the vertical partition 15 around the lower portion of the striking cylinder 18.

Relief valve: A grip cap 22 is fixed to the rear end of the grip portion 9 with a bolt (not shown). An air plug 23 for connecting to an air compressor (not shown) existing outside the nailing machine through a hose (not shown) is screwed into the screw hole 22a of the grip cap 22. On the lower end side near the rear end of the inner wall surface of the grip portion 9, there is formed a valve accommodating portion 25a having a substantially open-ended tubular shape. At the inner end of the valve accommodating portion 25a, a circular ring-shaped shoulder portion 24 that is open toward the rear of the grip portion 9 is provided. An annular shoulder portion 27 formed on the front end surface of a valve casing 26 of a relief valve 25 inserted from the rear of the grip portion 9 is in contact with the shoulder portion 24. The valve casing 26 is a stepped open-ended cylinder. The rear end surface of the valve casing 26 projects slightly rearward from the rear end surface 9a of the grip portion 9 and abuts on an annular shoulder portion 28 formed near the lower end of the inner wall surface of the grip cap 22. An outer flange 29 is formed near the rear end of the valve casing 26, and a seal for sealing the compressed air storage chamber 14 is provided between the shoulder portion 28 on the grip cap 22 side and the rear end surface of the outer flange 29. 30 is fitted. The seal 30 has a portion arranged also around the inner opening of the air plug 23. In the grip cap 22, a through hole 31 with a seat 34 is formed on the inner peripheral side of the shoulder portion 28. As can be understood from the vertical cross-sectional shape of the grip cap 22, the grip cap 22 can be mold-cast including the through hole and the pilot hole of the screw hole 22a.

A stem-shaped valve body 32 is arranged in the valve casing 26. The valve body 32 is constantly urged to close the inner end opening of the valve casing 26 by a compression coil spring 33, one end of which contacts the seat 34 of the grip cap 22 and which sets a relief pressure. An O-ring 32a is fitted on the inner end portion 32b of the valve body 32. When the air pressure in the compressed air storage chamber 14 does not reach the relief pressure, the inner end portion 32b of the valve body 32 is inserted into the inner end portion of the valve casing 26 by the force of the compression coil spring 33, and the grip cap 22 The compressed air storage chamber 14 is hermetically sealed in the through hole 31 of FIG. When the valve body 32 having the above structure is assembled to the grip portion 9, the valve casing 26, the valve body 32 and the compression coil spring 33 are integrally inserted from the rear of the grip portion 9 and the shoulder portion 27 of the valve casing 26 is After abutting against the shoulder portion 24 formed on the inner wall surface of the grip portion 9, the grip cap 22 is inserted into the through hole 31 of the grip cap 22 with the outer end portion of the valve body 32 inserted. It is attached and fixed to the rear end surface of 9 with bolts.

Striking Cylinder / Piston Mechanism: The striking cylinder / piston mechanism 3 includes a striking cylinder 18 having an oval cross section, and a striking piston 5 having a cross section substantially the same as the cross section of the striking cylinder 18. On the circumferential wall of the striking cylinder 18, a large number of air holes 35 having check valves 19b mounted on the outer wall surface are arranged in the circumferential direction of the striking cylinder 18 at approximately the middle portion in the longitudinal direction of the striking cylinder 18. There is. The inside of the striking cylinder 18 communicates with the blowback compressed air storage chamber 21 through an air hole 35. A large number of rectangular cutouts 36 are arranged at the lower end of the peripheral wall of the striking cylinder 18 in the circumferential direction of the striking cylinder 18. Due to these notches 36, the interior of the impact cylinder 18 communicates with the blowback compressed air storage chamber 21. This communication is ensured even when the striking piston 5 is stationary at the lower end. The lower end of the striking cylinder 18 is in contact with the upper surface of the oblong bumper 37 arranged on the inner bottom portion of the main cylinder portion 2. The upper end of the striking cylinder 18 abuts the lower end of an elliptical head valve cylinder 40 extending downward from the ceiling wall of the housing cap 8 via the spacers 38 and 39, whereby the striking cylinder 18 is moved to the main housing. It is fixed in the longitudinal direction of the part 2. The spacer 39 is arranged between the lower end of the head valve cylinder 40 and the spacer 38, and has notches (not shown) distributed in the circumferential direction. Due to this notch, when the head valve piston 44 of the head valve 7 rises, the compressed air storage chamber 14 and the striking piston upper chamber formed above the striking piston 5 inside the striking cylinder 18 communicate with each other. The striking cylinder 18 is an aluminum alloy cylindrical body having an oval cross section, and can be formed by extrusion molding according to the conventional technique except for cutting the air holes 35 and the notches 36.

The striking piston 5 has a piston ring fitting groove 43 for fitting the piston ring 41 and the back-up ring 42 on the outer peripheral wall thereof. The piston ring 41 is an oblong annular body with a rectangular cross section, is made of a synthetic resin having lubricity (for example, polyimide), and has a slit (Fig. (Not shown). The backup ring 42 is a conventional O-ring.

Driver: The driver 6 extends as a piston rod of the striking piston 5 and is blade-shaped.

Nose unit: The nose unit 4 has an acute isosceles isosceles triangle shape as a whole, which is narrowed toward the tip (lower end) when viewed from the front, and is located at the lower end of the main housing portion 2 of the nailer housing 1. It is fixed. To be precise, a wear plate 59, which is a rear member of the nose unit 4, is fixed to the lower end of the main housing portion 2, and a nose front cover 60 is detachably fixed to the wear plate 59 by bolts 61. The wear plate 59 is integrally assembled with the magazine body 63 of the magazine unit 13 by bolts 62. On the central axis of the wear plate 59, a driver guide path 64 through which the blade-shaped driver 6 reciprocates is formed. In the vicinity of the upper end portion of the wear plate 59, which is continuous with the driver guide path 64, a rectangular opening 65 extending along the driver guide path 64 and penetrating the wear plate 59 back and forth is provided.

On the other hand, between the nose front cover 60 and the wear plate 59, the rectangular plate-shaped contact plate 66 of the contact arm unit 12 forms a part of the driver guide path 64 and acts as a nail guide. A connecting piece 67, which is arranged so as to be slidable with the inner surface of the front cover 60 and projects rearward at the upper end of the contact plate 66, projects rearward from the opening 65 of the wear plate 59.

Head Valve: The head valve 7 is a three-way valve that is controlled to open and close by a differential pressure of air pressure, and has a head valve cylinder 40 and a vertical T-shaped vertical section inside the head valve cylinder 40. The head valve piston 44 is fixed between the hollow head valve piston 44, the inner wall surface of the recess 46 formed in the center of the peripheral ceiling wall 45 of the housing cap 8 and the central ceiling wall 47 of the housing cap 8. It includes a Linda cap 48 and a compression coil spring 49 arranged between the head valve cylinder cap 48 and the head valve piston 44. A control chamber 50 formed by the head valve cylinder 40, the head valve cylinder cap 48, and the head valve piston 44 communicates with an annular air passage 52 of the trigger valve 10 via an air passage 51 shown by a broken line. . At the upper end of the head valve cylinder cap 48, a plurality of exhaust holes 53 are distributed and arranged in the circumferential direction of the head valve cylinder cap 48. An exhaust hole 55 is also formed in the vertical wall 54 between the central ceiling wall 47 and the peripheral ceiling wall 45 of the housing cap 8. An annular exhaust cover 56 is attached to the outer periphery of the vertical wall 54. The exhaust cover 56 has a rectangular exhaust hole 57 at one location and can rotate 360 °. As a result, when the head valve piston 44 is at the lower limit position and the space between the striking piston upper chamber and the compressed air storage chamber 14 is closed, the hollow inside of the head valve piston 44 becomes the exhaust holes 53 and 55. It communicates with the atmosphere through the exhaust hole 57 of the exhaust cover 56. When the head valve piston 44 rises to the upper limit position, the upper end of the head valve piston 44 abuts on the bumper 58 fixed to the central ceiling wall 47 of the housing cap 8 so that the striking piston upper chamber and the compressed air storage chamber 14 are separated from each other. The air passages formed by the exhaust holes 53, 55 and 57 are closed. The ascent and descent of the head valve piston 44 are determined by whether the compressed air in the compressed air storage chamber 14 or the atmospheric pressure is introduced into the control chamber 50.

Trigger Valve: The trigger valve 10 is of a conventionally used type, and has a trigger valve cylinder 68 screwed and fixed to the grip portion 9, and an upward conical portion and a downward conical portion at the upper end. It consists of a poppet 69. The upper end of the poppet 69 is disengaged from the hole 70 at the upper end of the trigger valve cylinder 68, and the lower end of the poppet 69 projects in and out from the lower end surface of the trigger valve cylinder 68. When the poppet 69 is pushed up by the trigger 11, the upward conical portion of the poppet 69 comes into contact with the peripheral edge of the hole 70 to close the hole 70, and the downward conical portion of the poppet 69 separates from the O-ring 71, so that the control chamber 50 is closed to the compressed air storage chamber 14 and is open to the atmosphere at the same time. On the other hand, when the trigger 11 is released, the opposite positional relationship occurs.

Trigger and Trigger Lock Mechanism: The trigger 11 is pivotally supported on the grip portion 9 by the pin 72 in the vicinity of the outer wall surface of the main housing portion 2 as described above. On the side of the finger-holding portion 73 of the trigger 11, the lock body 75 of the trigger lock mechanism 74, which faces the finger-holding portion 73, is provided on the lower surface side of the grip portion 9 in the recess 76 of the boss portion 96 formed on the outer wall surface thereof. It has been inserted.

The trigger 11 has a U-shaped cross section, has a downward spring receiving surface 78 at its pivot end, and is provided for operating the trigger valve 10 on the right and left rising walls 79 near the pivot end. A bearing hole for supporting a pin 81 pivotally supporting the top 80 is provided, and a spring receiver 83 protruding in the lateral direction is provided on one rising wall 79 on the side closer to the finger-holding portion 73 than the bearing hole. . A spring receiving boss 84 protruding upward is provided at the front end of the finger hook 73 between the ascending walls 79 of the trigger 11. A step 85 is formed in a substantially middle portion of the rising wall 79 so that the finger hanging portion 73 side is lowered.

A top 80 is pivotally supported by the pin 81. A torsion coil spring 86 is attached to the top 80, one end of which is engaged with the top 80 and the other end is bent into a U shape, and an operating end member 87 of the contact arm unit 4 and a spring receiver 83 are provided. Is engaged with. When the tip of the contact plate 66 is brought into contact with the nail driving material and the tip of the contact plate 66 is retracted to the tip of the wear plate 59 of the nose unit 4, the operating end member 87 of the contact arm unit 4 is replaced with the torsion coil spring 86. The end is pushed up and brought into contact with the spring receiver 78. As a result, the spring force of the torsion coil spring 86 is strengthened, and the top 80 is urged clockwise in FIG. 2 to a position where it can be engaged with the lower end of the poppet 69 of the trigger valve 10. On the contrary, if the operator pulls the trigger 11 before pressing the tip of the contact plate 66 against the nail driving material, the top 80 rotates counterclockwise together with the trigger 11 and engages with the lower end of the poppet 69. It will rotate to a position that does not exist. Therefore, even if the tip of the contact plate 66 is pressed against the nail driving material, the comma 80 does not push up the poppet 69.

The trigger lock mechanism 74 includes a trigger lock body 75, a compression coil spring 88 disposed between the trigger lock body 75 and the spring receiving boss 84 of the trigger 11, and a boss portion 96 of the grip portion 9. And the formed concave portion 76. The trigger lock main body 75 includes a handle portion 89 having a fan-shaped peripheral surface, a single-bottomed cylindrical portion 90 protruding upward from the handle portion 89, and a single-bottomed cylindrical portion 90 on the upper surface of the handle portion 89. A positioning key portion (not shown) protruding laterally from the outer peripheral surface. The handle portion 89 is coaxial with the finger-holding portion (not shown) having serrations at one end in the circumferential direction, the cylindrical portion 90 with one bottom, and a short cylindrical boss projecting downward and a short cylindrical boss. It has a locking block 94 that projects laterally and is in the first position in the rotational direction, and two grooves (not shown) that extend in parallel on both sides of the short cylindrical boss. One groove is an unlock groove at the first position in the rotation direction, and the other groove is a weight-reducing groove. The outer edge shape of the handle portion 89 is the circular rear end shape of the boss portion 96 extending from the main housing portion 2 to the rear of the grip portion 9 on the lower surface side of the boundary portion between the main housing portion 2 and the grip portion 9. When the trigger lock body 75 is inserted into the recess 76, the outer edge of the handle portion 89 slightly protrudes from the circular rear end of the boss portion 96. Therefore, when the operator puts his / her index finger on the finger rest 92, there is no discomfort that the handle 89 projects from the boss 96 of the grip 9. The positioning key portion has slopes (not shown) extending from the upper end to the lower end on the left and right, and has a triangular flat portion (not shown) in the middle.

On the other hand, the recess 76 has a cylindrical recess into which the cylindrical portion 90 with a bottom of the trigger lock body 75 is inserted and a key hole (not shown) into which the key portion of the trigger lock body 75 is inserted. It is provided. At the center of the bottom of the key hole, there is provided a ridge (not shown) having a triangular cross-section extending radially outward from the cylindrical recess, and grooves (not shown) on both sides of the ridge. ) Has been formed. By the rotation of the trigger lock main body 75, the flat portion of the key portion is inserted and positioned in any of these grooves. As a result, either one of the unlock groove of the handle portion 89 and the lock block 94 faces the trigger 11, and it is determined whether the trigger 11 is unlocked or locked.

Contact arm unit: As described in the section of the nose unit 4, the contact arm unit 12 includes a rectangular plate-shaped contact plate 66 of the contact arm unit 12 between the nose front cover 60 and the wear plate 59. Is formed so as to form a part of the driver-provided inner passage 64 and to act as a nail guide so as to be slidable with the inner surface of the nose front cover 60, and a connecting piece 67 protruding rearward is provided at the upper end of the contact plate 66. The wear plate 59 projects rearward from the opening 65. The rear end portion of the connecting piece 67 of the contact plate 66 is only fitted into the rectangular groove 105 formed in the contact portion 104 of the contact arm unit 12 and extending in the longitudinal direction of the grip portion 9. The joining portion 104 is joined to the L-shaped actuating end member 87 via the adjusting dial 106 so as to reciprocate integrally in the vertical direction. In this way, since the contact plate 66 is arranged inside the nose unit 4 and the connecting piece 67 also projects rearward from the opening 65 of the wear plate 59, there is no business trip around the nose unit 4. The cornering performance of the nail driver is improved. Further, since the connecting piece 67 connects the contact plate 66 and the operating end member 87 only by inserting the connecting piece 67 into the rectangular groove 105 of the joining portion 104, even when the nail is clogged in the driver guide path 64 of the nose unit 4, The nose unit 4 and the contact arm unit 12 can be easily disassembled and the nails can be easily removed. Subsequent assembly of the nose unit 4 and the contact arm unit 12 is easy.

Magazine Unit 13: The magazine unit 13 is fixed to the wear plate 59 and has a C-shaped cross-section of the magazine body 63, and the upper and lower walls 63a and 63b of the magazine body 63, which are formed in grooves extending in the front-rear direction. The slider 110 is reciprocally attached to the magazine body 63 along the front and rear directions, and opens the side opening of the magazine body 63 when the magazine body 63 is moved rearward. As described above, the magazine unit 13 is of a horizontal loading type in which the nail is loaded into the magazine main body 63 from the side. On the inner wall surface of the magazine body 63, a plurality of nail head guides having a rectangular cross section for guiding the movement of the nail heads according to the lengths of a plurality of types (7 types in Fig. 2) of nails used. The groove 111 extends in the front-rear direction. A pusher guide groove 112 having a rectangular cross section is provided in the lower part of the inner wall surface of the magazine body 63 in the front-rear direction. The pusher 113 is attached to the inner wall surface of the magazine body 63 so as to be reciprocally movable in the front-rear direction. At the rear end of the magazine main body 63, there is provided a rear wall portion 115 projecting toward the slider 110 integrally with a hanger 116 connected to the rear end of the grip portion 9. A short cylindrical spring receiver 114 is provided at the rear end of the pusher 113. A compression coil spring 117 is arranged between the rear wall portion 115 of the magazine body 63 and the spring receiver 114 of the pusher 113, and always urges the pusher 113 toward the nose unit 4. A pusher stopper 118 is provided integrally with the rear wall portion 115 of the magazine body 63 so as to contact the rear surface of the body 113a of the pusher 113. A pusher lock lever 119 is pivotally supported by a member integrated with the pusher stopper 118 on the side closer to the inner wall surface of the magazine body 63 than the pusher stopper 118, and is biased counterclockwise in FIG. 2 by a torsion coil spring 120. . At the front end of the pusher lock lever 119, a claw 122 that engages with a hook portion 121 having a triangular cross section provided on the upper surface of the pusher 113 is provided slightly forward of the spring receiver 114 of the pusher 113. The claw 122 is a rectangular plate extending in the horizontal axis direction of the pusher lock lever 119. On the other hand, the hook part 121 has a slope 121a that gradually increases from the rear part of the pusher 113 toward the front part. At the upper end of the pusher lock lever 119 in the middle in the front-rear direction, a rectangular claw 123 that projects upward and releases the pusher lock projects in the lateral axis direction of the pusher lock lever 119. The claw 123 is formed as an inclined plate that gradually lowers from the rear portion to the front with respect to the vertical axis of the pusher lock lever 119. The lower surface of the claw 123 is fixed to the slider 110 side and is disengaged from the upper surface of the lock releasing claw 125 protruding toward the magazine body 63. In the vicinity of the front end of the pusher 113, a rectangular hooking piece 126 protruding toward the inner wall surface of the slider 110 is provided. The hooking piece 126 engages with the rear surface side of the front wall portion (not shown) of the slider 110 on the front surface side thereof.

When the operator loads the sheet-like connecting nail into the magazine unit 13, when the slider 110 is unlatched and pulled rearward with respect to the magazine body 63, the front wall portion of the slider 110 is pushed by the pusher 113. It is hooked on the hooking piece 126, compresses the compression coil spring 117, and is moved backward together with the slider 110. When the slider 110 is pulled until it comes close to the rear end position with respect to the magazine body 63, the inclined surface 121a of the hook portion 121 of the pusher 113 comes into contact with the lower surface of the claw 122 of the pusher lock lever 119, and the rear portion of the slider 110 is moved. The pusher lock lever 119 is rotated in the clockwise direction in FIG. When the slider 110 is pulled to the rear end position with respect to the magazine body 63, the pusher 113 contacts the pusher stopper 118 and the claw 122 engages with the front surface of the hook portion 121 of the pusher 113. On the other hand, when the operator loads the sheet-like connecting nail from the side surface of the magazine body 63 and then the slider 110 is pushed forward with respect to the magazine body 63, the pusher 113 is moved to the rear end position with respect to the magazine body 63. Since it remains locked, the force of the compression coil spring 117 is not applied to the sheet-like connecting nail, and the slider 110 is not affected by the force of the compression coil spring 117, and only the force of the operator's hand is used. Advance. When the front wall of the slider 110 approaches the wear plate 59, the lock release claw 125 engages with the claw 123 of the pusher lock lever 119 to rotate the pusher lock lever 119 clockwise in FIG. When the slider 110 reaches the front end position, the hook portion 121 of the pusher 113 and the claw 122 are disengaged, and the pusher 113 is unlocked. As a result, the pusher 113 is pushed by the compression coil spring 117 and comes into contact with the tailmost nail of the sheet-like connecting nails loaded in the magazine body 63.

The slider 110 has a plurality of grooves extending in the front-rear direction of the slider 110 corresponding to the nail head guide grooves 111. One nail head pressing bar 128 for pressing the nail head is arranged to extend in the front-rear direction of the slider 110 so as to face each groove. A hexagonal rear wall 129 is attached to the rear end of the slider 110 with a bolt (not shown). An L-shaped hexagon wrench (not shown) extending from the rear wall 129 in the longitudinal direction of the slider 110 is housed. On the rear surface of the rear wall 129, there is formed an inclined portion 130 for storing or taking out the short arm portion of the L-shaped wrench while rotating.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a relief valve in a fluid-driven device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway vertical sectional view of a pneumatic nailer equipped with a relief valve of the present invention.

[Explanation of symbols]

 9 Grip part (wall) 9a Rear end face 14 Compressed air storage chamber (accumulator) 22 Grip cap (cap) 24 Shoulder part 25a Valve housing part 26 Valve casing 28 Shoulder part (inner end face of cap) 31 Through hole 32 Valve body 33 Compression Coil spring 34 seat (inner end surface of cap)

Claims (1)

[Scope of utility model registration request] 1. A relief valve in a fluid-driven device in which an opening provided in a continuous wall forming an accumulator is closed by a cap, the relief valve being formed in a substantially double-ended open cylindrical shape on an inner surface of the wall. A hollow valve accommodating portion extending to the opening of the accumulator,
A valve accommodating portion having a shoulder portion facing the opening portion of the accumulator at its inner end, and closing the accumulator opening portion that is attached to the wall and is continuous with the outer end opening portion of the valve accommodating portion in the axial direction of the valve accommodating portion. A cap having a through hole extending to the inside of the valve housing, a tubular valve casing with both ends opened, the inner end of which is in contact with the shoulder and the outer end of which is in contact with the inner end surface of the cap, and the inside of the valve casing. A stem-shaped valve body that is movable in the axial direction, and when it is located on the innermost side with respect to the valve casing, the inner end of the valve casing is closed, and the outer end is arranged to be able to move in and out of the through hole. And a compression coil spring that sets a relief pressure, the compression coil spring being arranged around the valve body, the outer end of which is in contact with the inner end surface of the cap and the inner end of which is supported by the valve body. Lily in F valve.