JP2557757Y2 - Trigger lock mechanism for power tools - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger lock mechanism for a power tool which is manually operated via a trigger, and more particularly, to a reciprocally movable air piston / pneumatic piston powered by compressed air.
The present invention relates to a trigger locking mechanism for manually operating a trigger valve of a pneumatic nailing machine which drives a nail into a nail driving material by a cylinder and controls a pneumatic piston mechanism by a pneumatic valve mechanism.

[0002]

2. Description of the Related Art In general, a pneumatic nailing machine is slidable in the axial direction of a nose unit for ejecting nails provided on a coaxial extension of an air piston / cylinder. Only when the contact arm unit and the trigger which are pressed against the nailing material before being pressed against the nailing material have a nailing positional relationship, the trigger pulling operation of the operator is transmitted to the trigger valve. I have. Therefore, the contact arm unit is a safety device that automatically operates at the time of nailing, but the tip of the contact arm unit carelessly comes into contact with an object around the nailing work site and is in a positional relationship with the trigger. As a result, nails may be ejected against the intention of the operator. Therefore, in order to prevent inadvertent ejection of nails, a conventional pneumatic nailing machine is provided with a trigger lock mechanism that locks the trigger at the inoperative position by manual operation of the operator near the trigger ( See Japanese Utility Model Application Laid-Open No. 51-118290).

[0003] However, the conventional trigger lock mechanism has such a lock operation portion that the pneumatic nailer cannot operate with the fingers of the hand while holding the grip portion of the pneumatic nailer, both when the lock device is operated and when the lock is released. Operability is poor because it protrudes greatly from the grip of the nailing machine. In addition, the conventional trigger lock mechanism is composed of two to several parts,
There is the disadvantage that manufacturing and assembly costs are high.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a trigger lock mechanism for a power tool which is excellent in operability (in particular, operability of unlocking immediately before nailing work) and has low manufacturing and assembly costs. That is.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a housing having a grip portion, a trigger pivotally attached to the grip portion at a pivot, and a drive mechanism provided in the housing and operated by rotating the trigger. A boss portion of a grip portion provided near the pivot point and formed with a concave portion opened toward the trigger, and a trigger lock body inserted in the concave portion so as to be rotatable in the rotational direction. First
A trigger lock body having a projection disposed at a position in the rotation direction of the trigger to prevent rotation of the trigger, and having a groove for receiving a pulled trigger at a second position in the rotation direction; Latch means for latching the trigger lock body at the first position or the second position in the rotation direction by engagement of the peripheral wall surface of the trigger lock body with the trigger lock body; and between the trigger lock body and the trigger disposed between the trigger lock body and the trigger. And a spring for urging the opening in the opening direction.

[0006]

When the trigger lock body is rotated so that the groove faces the trigger and latched at that position, the trigger can be pulled. On the other hand, when the trigger lock main body is rotated so that the protrusion is opposed to the trigger and latched at that position, the trigger is locked.

Since the trigger lock body can be rotated by the fingers of the operator who operates the trigger by gripping the grip portion, the operability is good. Further, the trigger lock mechanism is assembled by simply inserting the trigger lock body into the recess of the boss portion and is fixed using the return spring of the trigger, so that the trigger lock mechanism has a good assembling property. Therefore, the trigger lock mechanism
The only additional component required for the configuration is the trigger lock body, and the number of components is small. Therefore, the manufacturing cost and the assembly cost of the trigger lock mechanism are low.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the pneumatic nailer having the trigger lock mechanism of the present invention mainly includes a nail driver housing 1 having a substantially L-shaped overall shape and a front part of the nail driver housing 1. Main housing part 2 formed
A striking cylinder / piston mechanism 3 disposed coaxially with the main housing part 2 and fixed therein; a nose unit 4 fixed to the lower end of the main housing part 2 and extending coaxially with the striking cylinder / piston mechanism 3 to eject nails; A driver 6 extending as a piston rod of a striking piston 5 and reciprocating in a nose unit 4; a flow of compressed air into the striking cylinder / piston mechanism 3 arranged at the upper end of the striking cylinder / piston mechanism 3; 3, a head valve 7 for controlling the exhaust from the housing 3, a housing cap 8 for closing the upper end of the main housing part 2 and forming a part of the head valve 7, a grip part 9 of the nail driving machine housing 1, and the main housing part 2. And a trigger valve 10 provided at the lower side of the boundary of the main housing 2 for controlling the opening and closing of the head valve 7. A trigger 11 for the operator to manually operate the trigger valve 10, a contact arm unit 12 mechanically associated with the trigger 11, and a contact plate in which the contact plate reciprocates in the nose unit 4 in the axial direction of the nose unit 4; A large number of nails (particularly finished nails whose head diameter is slightly larger than the shank diameter) are fixed to the rear side wall surface of the nose unit 4 and extend rearward substantially parallel to the grip portion 9 without gaps. And a magazine unit 13 for loading the sheet-like connecting nails arranged and joined together. Hereinafter, each part will be described in detail.

Nailer housing: Nailer housing 1
Consists of 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 a compressed air storage chamber 14 surrounding the upper part of the striking cylinder / piston mechanism 3. A vertical partition 15 extending in the longitudinal axis direction of the main housing part 2 is provided at a boundary between the main housing part 2 and the grip part 9 at a lower portion inside the main housing part 2. An oblong shoulder 16 is formed at an axially middle portion of the inner wall surface of the main housing portion 2 including the vertical partition wall 15. The cylinder ring 17 is fixed laterally with the cylinder ring 17 mounted on the shoulder 16, and the impact cylinder 18 is positioned in the lateral direction.

On the cylinder ring 17 is mounted a rubber-made ring-shaped transverse partition / check valve unit 19. The horizontal bulkhead / 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 externally inserted into the impact cylinder 18. The horizontal bulkhead / check valve unit 19 is a relatively thick horizontal bulkhead 1.
9a and the horizontal partition 1 are thinner than the horizontal partition 19a.
9a, and a check valve portion 19b provided on the inner periphery of 9a. The horizontal partition wall 19a closes and seals the space between the compressed air storage chamber 14 and the compressed air storage chamber 21 for blowback formed around the lower part of the impact cylinder 18 and inside the vertical partition wall 15.

A grip cap 22 is fixed to the rear end of the grip portion 9 by bolts (not shown).
The grip cap 22 is provided with an air plug 23 for connection via a hose (not shown) to an air compressor (not shown) existing outside the nailing machine. At the lower end near the rear end of the inner wall surface of the grip portion 9, a grip portion 9 is provided.
A rearwardly open annular shoulder 24 is provided. An annular shoulder 27 formed on the front end surface of the valve casing 26 of the relief valve 25 inserted from behind the grip 9 is in contact with the shoulder 24. The valve casing 26 is a stepped open-end cylinder. The rear end surface of the valve casing 26 is larger than the rear end surface 9a of the grip portion 9.
It protrudes slightly rearward, and is in contact with an annular shoulder 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-ring for sealing the compressed air storage chamber 14 is provided between the shoulder 28 on the grip cap 22 side and the rear end surface of the outer flange 29. 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 28. In the valve casing 26, a stem-shaped relief valve body 32 is arranged. One end of the relief valve body 32 abuts against the seat 34 of the grip cap 22 and is constantly urged by a compression coil spring 33 that sets the relief pressure so as to close the inner end opening of the valve casing 26.

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. A plurality of air holes 35 each having a check valve 19b mounted on the outer wall surface are distributed in the circumferential direction of the striking cylinder 18 at a substantially middle portion of the striking cylinder 18 in the longitudinal direction of the striking cylinder 18. . The inside of the impact cylinder 18 communicates with the blowback compressed air storage chamber 21 through the air hole 35. At the lower end of the peripheral wall of the striking cylinder 18, a number of rectangular cutouts 36 are dispersedly arranged in the circumferential direction of the striking cylinder 18. The inside of the impact cylinder 18 communicates with the blow-back compressed air storage chamber 21 by these notches 36. This communication is ensured even when the striking piston 5 is stationary at the lower end. The lower end of the impact cylinder 18 is connected to an oval-shaped bumper 37 disposed on the inner bottom of the main cylinder 2.
Is in contact with the upper surface. The upper end of the impact cylinder 18 abuts on the lower end of an oblong head valve cylinder 40 extending downward from the ceiling wall of the housing cap 8 via spacers 38 and 39, whereby the impact cylinder 18 is connected to the main housing. The portion 2 is fixed in the vertical axis direction. The spacer 39 includes a head valve cylinder 40
It has cutouts (not shown) that are arranged between the lower end of the spacer and the spacer 38 and are 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 upper striking piston chamber formed above the striking piston 5 inside the striking cylinder 18. The striking cylinder 18 is a cylindrical body made of an aluminum alloy having an oval cross section, and can be formed by extrusion molding according to a conventional technique except for cutting of the air hole 35 and the notch 36.

The impact piston 5 has a piston ring fitting groove 43 for fitting a piston ring 41 and a backup ring 42 on its outer peripheral wall. The piston ring 41 is an oblong body having a rectangular cross section, is made of a synthetic resin having lubricity (for example, polyimide), and has a slit (not shown) in an annular portion forming one end side in the long axis direction. ). The backup ring 42
It is a conventional O-ring.

Driver: The driver 6 extends as a piston rod of the striking piston 5 and has a blade shape.

Nose unit: The nose unit 4
The shape as viewed from the front is an acute isosceles triangular shape as a whole, which becomes narrower toward the tip (lower end).
Is fixed to the lower end of the main housing part 2 of the main body. To be more precise, a wear plate 59 serving as a rear member of the nose unit 4 is fixed to the lower end of the main housing portion 2, and the 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 main body 63 of the magazine unit 13 by bolts 62. A driver guide path 64 on which the blade-shaped driver 6 reciprocates is formed on the center axis of the wear plate 59. A rectangular opening 65 that extends along the driver guide path 64 and penetrates the wear plate 59 back and forth is provided near the upper end of the wear plate 59 so as to be continuous with the driver guide path 64.

On the other hand, a rectangular contact plate 66 of the contact arm unit 12 forms a part of the driver guide path 64 between the nose front cover 60 and the wear plate 59, and acts as a nail guide to act as a nail guide. Cover 6
The connection piece 67 is disposed so as to be slidable with the inner surface of the contact plate 66 and protrudes rearward at the upper end of the contact plate 66.
Project 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. The head valve cylinder 40 and the vertical cross section of the head valve cylinder 40 are T-shaped. The hollow head valve piston 44 and the ceiling wall 4 around the housing cap 8
5, a head valve cylinder cap 48 fixedly disposed between an inner wall surface of a recess 46 formed substantially at the center of the housing 5 and a center ceiling wall 47 of the housing cap 8, a head valve cylinder cap 48 and a head valve piston 44.
And a compression coil spring 49 disposed therebetween. 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 dispersedly 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 center 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,
It can rotate 0 °. Thus, when the head valve piston 44 is at the lower limit position and closes the space between the upper striking piston chamber and the compressed air storage chamber 14, the hollow inside of the head valve piston 44 has the exhaust holes 53 and 55 and the exhaust cover It communicates with the atmosphere through the 56 exhaust holes 57.
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 a bumper 58 fixed to the central ceiling wall 47 of the housing cap 8, and the impact piston upper chamber and the compressed air storage chamber 14 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 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. And a poppet 69. The upper end of the poppet 69 is the trigger valve cylinder 6
The lower end of the poppet 69 protrudes and retracts with respect to 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 periphery of the hole 70 and
And the downward conical portion of the poppet 69 is separated from the O-ring 71, and the control chamber 50 is connected to the compressed air storage chamber 14.
And 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 by the grip 9 in the vicinity of the outer wall surface of the main housing 2 by the pin 72 as described above. A lock body 75 of a trigger lock mechanism 74 is provided on the lower surface side of the grip portion 9 on the side of the finger hook portion 73 of the trigger 11 so as to face the finger hook portion 73. It is inserted in.

The trigger 11 has a U-shaped cross section.
As shown in FIG. 8 and FIG. 8, the pivot end 77 has a downwardly facing spring receiving surface 78, and in the vicinity of the pivot end 77,
The trigger valve 10 is provided on the right and left rising walls 79a and 79b.
And a bearing hole 82 for supporting a pin 81 pivotally supporting a top 80 for operating the finger.
A spring receiver 83 protruding in the lateral direction is provided on the rising wall 79b closer to the side 3. The rising wall 79a of the trigger 11
A spring receiving boss 84 protruding upward is provided at the front end of the finger hooking portion 73 between the first and the 79b. At a substantially intermediate portion of the rising wall 79b, a step 85 is formed so that the side of the finger hook 73 becomes lower.

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 in a U-shape, and the working end member 87 of the contact arm unit 4 is provided.
And the spring receiver 83. Contact plate 66
When the tip of the contact plate 66 abuts against the nail driving material and the tip of the contact plate 66 retracts to the tip of the wear plate 59 of the nose unit 4, the operating end member 8 of the contact arm unit 4
7 pushes up the other end of the torsion coil spring 86, and
8 As a result, the spring force of the torsion coil spring 86 is increased, and the top 80 moves clockwise in the figure to a position where it can engage with the lower end of the poppet 69 of the trigger valve 10 as shown in FIG. It is urged to. vice versa,
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 to a position where it cannot engage with the lower end of the poppet 69. It turns. Therefore, even if the tip of the contact plate 66 is pressed against the nail driving material, the top 80 does not push up the poppet 69.

The trigger lock mechanism 74 includes a trigger lock body 75 and a compression coil spring 88 disposed between the trigger lock body 75 and the spring receiving boss 84 of the trigger 11.
And a concave portion 76 formed in the boss portion 96 of the grip portion 9. 1 and FIGS. 3 to 6.
, 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. And a positioning key portion 91 protruding laterally from the outer peripheral surface of the main body. The handle portion 89 includes a finger hook portion 92 having serrations at one end in the circumferential direction, and a cylindrical portion 90 with one bottom.
And a short cylindrical spring receiver 9 which is coaxial with and protrudes downward.
3, a locking block 94 that projects laterally from the spring receiver 93 and is at the first position in the rotation direction, and has grooves 95a and 95b extending in parallel on both sides of the spring receiver 93. The groove 95a is an unlocking groove at the first position in the rotation direction, and the groove 95b is a lightening groove. The outer edge shape of the handle portion 89 is the same as the circular rear end portion shape of the boss portion 96 extending rearward of the grip portion 9 from the main housing portion 2 on the lower surface side of the boundary between the main housing portion 2 and the grip portion 9. When the trigger lock body 75 is inserted into the concave portion 76, the outer edge of the handle portion 89 slightly protrudes from the circular rear end portion 96a of the boss portion 96 when the trigger lock body 75 is inserted into the concave portion 76. Therefore, the operator operates the finger hook 92
When the forefinger is placed on the grip portion 9, there is no uncomfortable feeling that the handle portion 89 protrudes from the boss portion 96 of the grip portion 9. As shown in FIGS. 4 and 5, the positioning key 91 has left and right inclined surfaces 97a and 97b from the upper end to the lower end, and has a triangular flat portion 98 in the middle.

On the other hand, as shown in FIG.
6 is provided with a cylindrical concave portion 99 into which the cylindrical portion 90 with one bottom of the trigger lock main body 75 is inserted, and a key hole portion 100 into which the key portion 91 of the trigger lock main body 75 is inserted. At the bottom of the key hole 100, a cylindrical recess 9 is provided at the center.
9 has a triangular ridge 101 extending radially outward.
Grooves 102 and 10 are provided on both sides of the ridge 101.
3 are formed. The rotation of the trigger lock body 75 causes the flat portion 98 of the key portion 91 to be inserted and positioned in one of the grooves 102 and 103. As a result, one of the unlocking groove 95a of the handle portion 89 and the locking block 94 faces the trigger 11, and it is determined whether the trigger 11 is unlocked or locked. As shown in FIGS. 1 and 3, the compression coil spring 88 is conventionally used as a return spring of the trigger 11, and is used for the trigger lock body 7.
Reference numeral 5 denotes a spring receiver on the nail driving machine housing 1 side of the compression coil spring 88. Thus, the trigger lock mechanism 7
The component 4 is substantially only the trigger lock main body 75, and the other components can be said to be those adapted from those conventionally existing.

As shown in FIG. 1, the handle portion 8 is held so that the lock block 94 faces the trigger 11.
When the lock 9 is positioned, the rising walls 79a and 79b of the trigger 11 are prevented from rotating by the locking block 94. The top 80 does not come into contact with the lower end of the poppet 69 even if it retracts to the top end of the top. On the other hand, as shown in FIG. 3, when the handle portion 89 is positioned such that the unlocking groove 95a faces the trigger 11, the trigger 11 enters the unlocking groove 95a, The pulling operation is possible. First, the contact plate 66 is pressed against the nail driving material,
Next, when the trigger 11 is pulled, the top 80 comes into contact with the lower end of the poppet 69 and pushes the poppet 69 up.

Contact Arm Unit: The contact arm unit 12 has a rectangular contact plate 66 of the contact arm unit 12 between the nose front cover 60 and the wear plate 59 as described in the section of the nose unit 4. A connecting piece 67 which forms a part of the driver guide path 64, acts as a nail guide, is slidable with the inner surface of the nose front cover 60, and projects rearward at the upper end of the contact plate 66 is a wear plate. 59 protrudes rearward from the opening 65. The rear end of the connecting piece 67 of the contact plate 66 is simply inserted into a rectangular groove 105 formed in the joint 104 of the contact arm unit 12 and extending in the longitudinal direction of the grip 9. The joint 104 is connected to the L
It is coupled to the U-shaped operating end member 87 so as to reciprocate integrally in the vertical direction. As described above, 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 nailing machine is improved. In addition, the connecting piece 67
Since the contact plate 66 and the working end member 87 are connected only by being inserted into the rectangular groove 105 of the joining portion 104, even if 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 is easy to disassemble, and the nail is easily removed. Subsequent nose unit 4 and contact arm unit 12
Is easy to assemble.

Magazine unit: Magazine unit 1
Reference numeral 3 denotes a magazine body 63 fixed to the wear plate 59 and having a C-shaped cross section, and a front-rear direction with respect to the magazine body 63 along a groove extending in the front-rear direction of the upper wall 63a and the lower wall 63b of the magazine body 63. And a slider 110 that reciprocates in the direction and that opens the side surface of the magazine body 63 when moved rearward. As described above, the magazine unit 4 is of a horizontal insertion type in which nails are 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 guide grooves having a rectangular cross section for guiding the movement of the head of the nail according to the length of the nails of plural kinds (in FIG. 2, seven kinds). Reference numeral 111 extends in the front-rear direction.
A pusher guide groove 112 having a rectangular cross section extends in the front-rear direction below the inner wall surface of the magazine body 63. The pusher 113 is attached to the inside wall surface of the magazine body 63 so as to be able to reciprocate in the front-rear direction. At the rear end of the magazine body 63, a hanger 116 connected to the rear end of the grip 9 is provided.
A rear wall portion 115 protruding toward the slider 110 is provided integrally therewith. At the rear end of the pusher 113, a short cylindrical spring receiver 114 is provided. 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 constantly biases the pusher 113 toward the nose unit 4. Magazine body 63
Body 113a of pusher 113 integrally with rear wall 115
A pusher stopper 118 is provided in contact with the rear surface of the pusher. On the side closer to the inner wall surface of the magazine body 63 than the pusher stopper 118, the pusher lock lever 11
9 is pivotally supported by a member integral with the pusher stopper 118,
The torsion coil spring 120 urges the counterclockwise direction in FIG. At the front end of the pusher lock lever 119, a claw 122 is provided slightly forward of the spring receiver 114 of the pusher 113 to engage with a hook portion 121 having a triangular cross section provided on the upper surface 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 portion 121 has a slope 121a gradually rising from the rear portion to the front portion of the pusher 113.
Having. At the upper end of the pusher lock lever 119 in the middle in the front-rear direction, a rectangular claw 123 projecting upward and releasing the pusher lock projects in the horizontal axis direction of the pusher lock lever 119. The claw 123 is formed as an inclined plate that gradually decreases from the rear to the front with respect to the longitudinal axis of the pusher lock lever 119. The lower surface of the claw 123 is fixed to the slider 110 side, and is engaged with and disengaged from the upper surface of an unlocking claw 125 protruding toward the magazine body 63. In the vicinity of the front end of the pusher 113, a rectangular engaging piece 126 protruding toward the inner wall surface of the slider 110 is provided. The hook 126 engages with the rear side of the front wall (not shown) of the slider 110 on the front side.

When the operator loads the connecting nail into the magazine unit 13 and the slider 110 is pulled backward with respect to the magazine body 63, the front wall of the slider 110 is hooked on the hook 126 of the pusher 113. Then, the compression coil spring 117 is moved backward integrally with the slider 110 while compressing the compression coil spring 117. When the slider 110 is pulled toward the rearmost position with respect to the magazine main body 63, the slope 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 slider 110 moves backward. With the movement, the claw 122
Is pushed up, and the pusher lock lever 119 is rotated clockwise in FIG. When the slider 110 is pulled to the rearmost position with respect to the magazine body 63, the pusher 11
3 comes into contact with the pusher stopper 118 and the claw 12
2 engages with the front surface of the hook portion 121 of the pusher 113. On the other hand, when the slider 110 is pushed forward with respect to the magazine main body 63 after the operator loads the connecting nail from the side surface of the magazine main body 63, the pusher 113 remains locked behind the magazine main body 63. 1
10 moves forward only by the force of the operator's hand without receiving the force of the compression coil spring 117. When the front wall of the slider 110 approaches the wear plate 59, the unlocking claw 125 engages with the claw 123 of the pusher lock lever 119 to rotate the pusher lock lever 119 clockwise in FIG. The engagement between the part 121 and the claw 122 is released, and the lock of the pusher 113 is released. This allows
The pusher 113 is pushed by the compression coil spring 117,
It comes into contact with the last nail of the connecting nail loaded in the magazine body 63.

The slider 110 is provided with a guide groove 1 for each nail head.
A plurality (six in FIG. 2) of grooves 127 extend in the front-rear direction of the slider 110 corresponding to the groove 11. Each groove 12
Opposite to 7, each nail head holding bar 128 for holding the nail head is arranged extending in the front-rear direction of the slider 110.

A hexagonal rear wall 129 is attached to the rear end of the slider 110 by bolts (not shown). An L-shaped hexagon wrench (not shown) that extends 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 accommodating or removing the short arm portion of the L-shaped wrench while rotating is formed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway longitudinal sectional view of a pneumatic nailer having a trigger lock mechanism of the present invention, showing a state in which a trigger is locked.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a longitudinal sectional view of the trigger lock mechanism of FIG. 1 and a peripheral portion thereof, showing a state in which the trigger is unlocked.

FIG. 4 is a side view of the trigger lock main body.

FIG. 5 is a plan view of a trigger lock main body.

FIG. 6 is a bottom view of the trigger lock main body.

FIG. 7 is a longitudinal sectional view of a trigger.

FIG. 8 is a plan view of the trigger.

FIG. 9 is a partially cutaway bottom view of the housing of the pneumatic nailer of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nailer housing 9 Grip part 11 Trigger 72 Pin (pivot point) 75 Trigger lock body 76 Depression 88 Compression coil spring 91 Positioning key part (latch means) 94 Lock block (projection part) 95a Unlocking groove (groove) 96 Boss 101 Protrusion (Latch) 102 Groove (Latch) 103 Groove (Latch)

Claims (1)

(57) [Scope of request for utility model registration] 1. A power tool including a housing having a grip portion, a trigger pivotally attached to the grip portion at a pivot, and a drive mechanism provided in the housing and operated by rotating the trigger. A boss portion of a grip portion provided near a fulcrum and formed with a concave portion opened toward the trigger, and a trigger lock body inserted in the concave portion so as to be rotatable about an axis. A trigger lock body having a protrusion arranged in the movement direction to prevent rotation of the trigger, and having a groove for receiving the pulled trigger at a second position in the rotation direction; a peripheral wall surface of the recess and a trigger lock body Latch means for latching the trigger lock body at the first position or the second position in the rotation direction by engagement of the trigger lock, and a latch means disposed between the trigger lock body and the trigger to open between the trigger lock body and the trigger. A trigger lock mechanism for the power tool, the spring being biased in a direction.