JPH0642079U - Exhaust cover device for compressed air driven tools - Google Patents

Abstract

(57) [Summary] [Purpose] A compressed air driven nailer that does not scatter dust when exhausting when nailing into the corner of a woodworking structure with the nose of the nailer facing upwards. An exhaust cover device is provided. A cylindrical member with a single bottom, which is formed in a part of a housing that houses a drive mechanism using compressed air as a power source and has an exhaust hole in the peripheral wall portion that communicates the inside and the outside, in the axial direction of this member. A member having two annular grooves, which are formed on the outer surface of the peripheral wall portion on both sides of the exhaust hole, and which are symmetrical with respect to the exhaust hole and have substantially the same shape, and the peripheral wall portion made of a rubber elastic material. An annular exhaust cover to be mounted, which partially has an exhaust hole that communicates the inside and the outside with the oblique direction with respect to the thickness direction of the peripheral wall, and has a seal ring that can be fitted in and out of the annular groove so as to be axially inclinable. It consists of an exhaust cover on the side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an exhaust cover device for a compressed air driven tool that uses compressed air as a power source.

[0002]

[Prior art and its problems]

 2. Description of the Related Art Conventionally, as an exhaust cover device for a compressed air driven nail driving machine (hereinafter referred to as a nail driving machine), for example, Japanese Patent Application No. 4-45674 discloses that compressed air consumed during a nail driving process is released into the atmosphere. At least one protrusion or recess is formed near the exhaust port, and the exhaust port has an exhaust cover made of a rubber elastic material that can change the exhaust direction. The exhaust cover has the above-mentioned protrusion or recess. When the exhaust cover is rotated and the exhaust direction is changed to change the exhaust direction, the recess or protrusion of the exhaust cover rides on the protrusion or recess near the exhaust port due to rubber elastic deformation of the exhaust cover and rotates. There has been proposed an exhaust cover device which becomes impossible and is capable of engaging with a convex portion or a concave portion near the exhaust port again. The exhaust cover does not have the exhaust port facing directly to the axis of the nose of the nailing machine, but is slightly inclined downward. Also, depending on the situation of the nailing work site, the exhaust cover has a range of 360 °. The exhaust direction can be changed. The exhaust cover changes the direction of exhaust so that the exhaust does not blow directly to the nailing operator's body (particularly the face), and the dust generated by the exhaust blows to the operator's body. You can avoid it.

However, according to the above exhaust cover device, when the nailing operator drives the nose of the nailing machine upward to drive the nail into the corner portion between the ceiling plate and the side wall plate of the building, the exhaust port is used. Is inclined upwards, so that the exhaust gas blows on the ceiling plate or the side wall plate in the corner and its vicinity, causing dust to adhere to the ceiling plate or the side wall plate. This dust will directly contact the face of the nailing worker. Further, when the rotation direction position of the exhaust cover is set so that the exhaust port is directed to the rear of the nail driver, there is a drawback that the exhaust blows on the hand of a young nailing operator and causes a feeling of strangeness.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to provide an exhaust cover device for a compressed air driven nailer that does not scatter dust when exhausting when a nail is driven into the corner of a woodworking structure with the nose of the nailer facing upward. Is to provide.

[0005]

[Means for Solving the Problems]

 The present invention is a cylindrical member with a bottom, which is formed in a part of a housing that houses a drive mechanism using compressed air as a power source and has an exhaust hole in the peripheral wall portion that communicates the inside and the outside. A member made of rubber elastic material and a member having two annular grooves of substantially the same shape which are formed on the outer surface of the peripheral wall portion on both sides of the exhaust hole in the axial direction and are symmetrically located with respect to the exhaust hole. An annular exhaust cover attached to the peripheral wall portion, which partially has an exhaust hole that communicates the inside and the outside and is oblique to the thickness direction of the peripheral wall, and is fitted into and removed from the annular groove so as to be axially inclinable. And an exhaust cover having a seal ring on the inner surface.

[0006]

[Operation and effect of the device]

 When the nailer is used with the nose unit facing downwards or sideways, the exhaust vents in the exhaust cover should be either facing downwards or upwards depending on the conditions of the nailing site. Used. When nailing the corners of the ceiling and side walls of a woodwork structure, make sure that the exhaust holes in the exhaust cover are facing upwards with respect to the nailer so that the exhaust does not hit the ceiling. A hammer is used. As a result, the exhaust gas does not cause dust adhering to the ceiling plate.

[0007]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 3, a pneumatic nailer equipped with an exhaust cover device according to an embodiment of the present invention mainly includes a nailer housing 1 having a substantially L-shaped profile and a nailer housing 1. A percussion cylinder / piston mechanism 3 fixed coaxially with the main housing part 2 in a main housing part 2 formed as a front part of the machine housing 1, and a percussion cylinder / piston mechanism fixed to the lower end of the main housing part 2. 3, a nose unit 4 that extends coaxially with 3 to eject a nail, a driver 6 that extends as a piston rod of a percussion piston 5 and reciprocates in the nose unit 4, and a percussion cylinder / piston arranged at the upper end of the percussion cylinder / piston mechanism 3. A head valve 7 that controls the inflow of compressed air into the mechanism 3 and the exhaust from the striking cylinder piston mechanism 3, and the upper end of the main housing portion 2. And a trigger valve that is provided below the boundary between the housing cap 8 that forms a part of the head valve 7 and the grip portion 9 of the nailer housing 1 and the main housing portion 2 and that controls the opening and closing of the head valve 7. 10, a trigger 11 that is pivotally supported on the outer wall surface of the main housing portion 2 for an operator to manually operate the trigger valve 10, and a contact plate that is mechanically related to the trigger 11 and that has a contact plate inside the nose unit 4. Of the contact arm unit 12 that reciprocates in the axial direction of the nose unit 4 and a large number of nails fixed to the rear side wall surface of the nose unit 4 and extending rearward 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 the sheet-like connecting nails, in which finishing nails of a slightly larger size) are juxtaposed in parallel with each other and joined together. 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 and is composed of a striking piston 5 having an oval cross section and a striking cylinder 18 having an oval cross section. A compressed air storage chamber 14 surrounding the upper portion of the piston mechanism 3 is formed. A vertical partition wall 15 extending in the longitudinal direction of the main housing portion 2 is provided at the boundary between the main housing portion 2 and the grip portion 9 in the 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.

A grip cap 22 is fixed to the rear end of the grip portion 9 with a bolt (not shown). The grip cap 22 is provided with an air plug 23 for connecting via a hose (not shown) to an air compressor (not shown) existing outside the nailing machine. An annular shoulder portion 24, which is partially open toward the rear of the grip portion 9, is provided on the lower end side near the rear end of the inner wall surface of the grip portion 9. An annular shoulder portion 27 formed on the front end surface of the valve casing 26 of the 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 of 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 an O 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. The ring 30 is fitted. 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. A stem-shaped relief valve element 32 is arranged in the valve casing 26. One end of the relief valve body 32 abuts on the seat 34 of the grip cap 22 and is constantly urged to close the inner end opening of the valve casing 26 by a compression coil spring 33 that sets a relief pressure.

Striking Cylinder / Piston Mechanism: The striking cylinder / piston mechanism 3 comprises 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 communicates with the piston upper chamber formed inside the striking cylinder 18 above the striking piston 5. The striking cylinder 18 is a cylindrical body made of an aluminum alloy having an oval cross section, and can be formed by the extrusion molding according to the conventional technique except for the cutting work of 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 in which the shape viewed from the front becomes narrower toward the tip (lower end), and is provided at the lower end of the main housing portion 2 of the nailing machine 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 to act 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 T-shaped vertical cross-section that is installed inside the head valve cylinder 40. A head valve fixed and arranged between a hollow head valve piston 44, an inner wall surface of a convex portion 46 formed substantially at the center of a peripheral ceiling wall 45 of the housing cap 8 and a central ceiling wall 47 of the housing cap 8. It consists of a cylinder cap 48 and a compression coil spring 49 arranged between the head valve cylinder cap 48 and the head valve piston 44. A bumper 58 is fixed to the inner surface of the central ceiling wall 47. 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. On 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.

Exhaust Cover Device: A rubber elastic 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 °. On the outer peripheral surface of the vertical wall 54 of the convex portion 46 of the housing cap 8, annular grooves 54a and 54b having the same U-shaped cross section and having a substantially U-shaped cross section are formed at vertically symmetrical positions with the exhaust hole 55 interposed therebetween. On the other hand, on the inner surface of the exhaust cover 56, seal rings 56a and 56b having a substantially semicircular cross section are integrally formed with the main body of the exhaust cover 56 at vertically symmetrical positions with the exhaust hole 57 interposed therebetween. As shown in FIG. 1, these seal rings 56a and 56b can be fitted in the annular grooves 54a and 54b, respectively. On the other hand, as shown in FIG. 2, when the exhaust cover 56 is mounted upside down on the vertical wall 54 of the housing cap 8, the seal rings 56a and 56b are now fitted into the annular grooves 54b and 54a, respectively. It can be fitted freely.

As shown in FIG. 1, the exhaust 57 is formed so as not to be directly adjacent to the axis of the exhaust cover 56 but to face obliquely downward. Therefore, as shown in FIG. 2, when the exhaust cover 56 is mounted on the vertical wall 54 of the housing cap 8 upside down as compared with the case of FIG. 1, the exhaust hole 57 faces obliquely upward. When the nailing operation is performed with the nose unit 4 of the nailing machine oriented downward or laterally, the exhaust cover 56 is used in the state shown in FIG. On the other hand, when the nailing work is performed with the nose unit 4 of the nailing machine facing upward (especially when cornering the ceiling plate and the side wall plate of the woodworking structure), the exhaust cover 56 is used. Is used in the state shown in FIG. As a result, when the nose unit 4 is facing upward and the nailing machine is used, the direction of the exhaust holes 57 is downward, so that dust is generated by blowing the exhaust gas to the corners of the ceiling plate and the side wall plates. There is no such thing. Also, the elastic contact between the sealing rings 54a and 54b and the annular grooves 56a and 56b allows the exhaust cover 56 to be stably stopped at the desired rotational position within the range of 360 °, so that the exhaust hole 57 is located directly behind. It is possible to prevent the exhaust gas from blowing to the hands of the nailing operator in a direction slightly deviated from the direction to the left and right. When the head valve piston 44 is at the lower limit position and closes between the piston upper chamber and the compressed air reservoir chamber 14, the hollow inside of the head valve piston 44 has exhaust holes 53 and 55 and an exhaust hole of the exhaust cover 56. 57 and communicates with the atmosphere. When the head valve piston 44 rises to the upper limit position, the upper end of the head valve piston 44 comes into contact with the bumper 58 fixed to the central ceiling wall 47 of the housing cap 8 and the piston upper chamber and the compressed air reservoir. The space to the chamber 14 is opened, and the air passage formed by the exhaust holes 53, 55 and 57 is closed. The rise and fall of the head valve piston 44 is determined by whether the compressed air in the compressed air storage chamber 14 or the atmosphere is introduced into the control chamber 50.

Trigger Valve: The trigger valve 10 is of a type conventionally used, 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 bearing surface 78 at its pivot end, and is provided for operating the trigger valve 10 on the right and left rising walls 79 in the vicinity of 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. 1 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 arranged 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 the 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 main body 63, and the upper and lower walls 63a and 63b of the magazine main body 63. 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 each having a rectangular cross section for guiding the movement of the nail heads according to the lengths of the plurality of kinds (7 kinds in FIG. 3) 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. 3 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-shaped connecting nails 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 (six in FIG. 3) grooves 127 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 127. A hexagonal rear wall 129 is attached to the rear end of the slider 110 by 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, an inclined portion 130 for storing or taking out the short arm portion of the L-shaped wrench while rotating is formed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an exhaust cover device in a fluid-driven tool according to an embodiment of the present invention, showing a state in which an exhaust hole faces downward.

2 is a vertical cross-sectional view of the exhaust cover device of FIG. 1, showing an exhaust hole facing upward.

FIG. 3 is a partially cutaway vertical sectional view of a pneumatic nailing machine having an exhaust cover device of the present invention.

[Explanation of symbols]

 1 Nailer Housing 3 Strike Cylinder / Piston Mechanism 8 Housing Cap 46 Convex Part (Short Cylindrical Member) 54 Vertical Walls 54a, 54b Annular Groove 55 Exhaust Hole 56 Exhaust Cover 56a, 56b Seal Ring 57 Exhaust Hole

Claims (1)

[Scope of utility model registration request] 1. A cylindrical member with a bottom, which is formed in a part of a housing that houses a drive mechanism using compressed air as a power source and has an exhaust hole in the peripheral wall portion that communicates the inside and the outside with the shaft of the member. In a direction, a member having two annular grooves of substantially the same shape, which are formed on the outer surface of the peripheral wall portion on both sides of the exhaust hole and are symmetrical with respect to the exhaust hole, and the peripheral wall made of a rubber elastic material. A ring-shaped exhaust cover that is mounted on a portion, and has an exhaust hole that partially communicates the inside and the outside and obliquely extends in the thickness direction of the peripheral wall, and is a seal that is axially inclinably fitted into and removed from the annular groove. An exhaust cover device for a compressed air driven tool comprising an exhaust cover having a ring on the inner surface.