JP2820053B2 - Trigger lock device for nailing machine - 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 device for a nailing machine, and more particularly to a trigger lock device having improved reliability.

[0002]

2. Description of the Related Art As a safety device for a nailing machine for a hand-held operation, a device provided with a trigger lock device is known. There are various types of trigger lock devices, but generally, a stopper is moved during the movable path of the trigger lever so that the trigger lever cannot be operated. The stopper is mounted on the upper end of the grip of the nailing machine so as to face the trigger lever, and can rotate between the trigger lock position and the unlock position. When the trigger lever is pulled as the trigger lock position, the trigger lever hits the stopper. The nailing machine is formed so as not to be able to start due to the contact and being prevented from moving.

When the stopper is rotated to the unlocked position, the stopper is retracted from the path of the trigger lever, or the groove or hole provided on the front surface of the stopper faces the trigger lever so that the trigger lever can be operated. Becomes

A finger lever is provided on the side surface of the stopper, and the thumb of the hand holding the grip of the nail driver pushes and pulls the finger lever to rotate the stopper to the trigger lock position or the unlock position. Can be. A moderation mechanism for fixing the stopper to the trigger lock position and the lock release position is provided in the stopper and the stopper mounting portion of the nailing machine, and has a structure that gives a click feeling to the operator.

[0005]

In the conventional trigger lock device in which the finger lock lever is provided on the trigger lock stopper, the finger lock lever protrudes to the side of the nailing machine in the trigger locked state. In addition, because it is a structure that can easily switch between the trigger lock position and the unlock position,
If the finger lever contacts the human body or other objects when the trigger lever is locked and moved, the stopper may rotate to the unlocked position and be in a state in which nailing can be performed, resulting in high reliability. Not enough.

Therefore, there is a technical problem to be solved in order to eliminate the risk of the stopper accidentally rotating from the locked position to the unlocked position against the intention of the operator and to improve safety. It is an object of the present invention to solve the above problems.

[0007]

SUMMARY OF THE INVENTION The present invention is proposed to achieve the above object. A dial opposing a rear surface of a trigger lever is rotatably mounted on an upper front surface of a grip of a nailing machine. A stopper portion protruding forward is provided on a part of the front surface of the dial, and a trigger lock position in which the stopper portion is located in a path of the trigger lever by rotating the dial, and a lock release position retracted from the path. In a trigger lock device of a nailing machine, which is formed so as to be switchable and has a moderation mechanism for fixing the dial at the trigger lock position and the unlock position, a dial mounting of the back surface of the dial and the grip is provided. One of the seats is provided with a spherical convex portion, and the other is provided with a concave portion which engages with the convex portion at a trigger lock position and an unlock position, and is provided with a spring. The dial is pressed against the dial mounting seat of the grip to form a moderation mechanism, and the upper edge portion of the concave portion at the trigger lock position forms a substantially vertical wall surface, and the upper edge portion of the concave portion at the lock release position The present invention provides a trigger locking device for a nailing machine having a gentle slope.

[0008]

When the dial mounted on the upper front of the grip of the nailing machine is rotated to the trigger lock position or the unlock position, the dial is fixed at the above two positions by the moderation mechanism comprising the convex portion, the concave portion and the spring. At the trigger lock position, the stopper that protrudes forward from the front of the dial faces the back of the trigger lever, making it impossible to pull the trigger lever. At the unlocked position, the stopper retracts from the path of movement of the trigger lever. Nail driving operation becomes possible.

The concave portion at the unlocked position has a gentle slope on the edge and is continuous with the dial mounting seat. When a rotational force is applied to the dial, the convex portion of the spherical surface separates from the concave portion along the slope, and Can be easily turned to the trigger lock position.

The edge of the recess at the trigger lock position has a wall surface that is perpendicular or nearly perpendicular to the dial mounting seat. Even if a rotational force is applied to the dial at the trigger lock position, the protrusion is formed at the edge of the recess. It is difficult to disengage by colliding with the part. Therefore, when releasing the lock, the dial is pulled up against the bias of the spring of the detent mechanism that presses the dial against the dial mounting seat, and the dial is rotated after releasing the engagement between the protrusion and the recess. Since a stepwise operation is required, there is no possibility that the dial will come into contact with the surroundings and the trigger lock will be released.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows an air-driven nail driver 1 in which a grip 3 is integrally formed with a mechanism housing 2. A nose portion 4 is attached to a front portion of the mechanism housing 2, and a driver rod coupled to a piston loosely fitted to a cylinder portion (not shown) in the mechanism housing 2 moves in the nose portion 4 in conjunction with the piston. To reciprocate. A nail magazine 6 is connected to the nail feed mechanism 5 on the lower surface of the nose portion 4, and the connected nails loaded in the nail magazine 6 are sequentially supplied into the nose portion 4.

A trigger lever 7 is slidably mounted on the lower surface of the mechanism housing 2. The hose connector plug 8 at the end of the grip 3 is connected to an air compressor via an air hose, and the trigger lever 7 is pulled. As a result, a trigger valve (not shown) connected to the trigger lever 7 is opened. As a result, the piston and the driver rod move rapidly toward the distal end of the nose part 4 due to the air pressure in the mechanism housing 2, and strike the head of the nail supplied into the nose part 4, so that the nail strikes the object. Be included.

A trigger lock device 9 is provided on the upper front surface of the grip 3, and a dial 10 of the trigger lock device 9 faces the rear surface of the trigger lever 7. As shown in FIG. 2, the circular dial 10 has a knurl formed on the outer periphery of a disk portion 10a and a center hole 11 in the center. A pair of spherical convex portions 12 displaced by 180 degrees about the center hole 11 project from the rear surface, and a pair of rectangular holes 13 are opened at positions rotated 90 degrees from the convex portions 12, respectively. A stopper 14 is provided on the surface of the same position as one of the protrusions 12 and projects forward. A knurl is formed on the outer peripheral surface of the stopper 14, but the outer peripheral surface of the stopper 14 is dialed. 10 bulges slightly outside the outer diameter.

FIG. 3 shows the rear half of the mechanism housing 2, and a dial mounting seat 15 is formed on the upper front surface of the grip 3. A boss 16 is provided at the center of the dial mounting seat 15, and the boss 16 is inserted through the center hole 11 of the dial 10 to rotatably support the dial 10. Two pairs of spherical concave portions 17 and 18 are provided on the upper, lower, left and right sides of the boss 16 at positions equidistant from the center of the boss 16, and formed in positions and shapes corresponding to the above-mentioned convex portions 12 of the dial 10, respectively. Have been. Therefore, if the dial 10 is inserted into the boss 16 and the dial 10 is rotated, the protrusion 1
2 can circularly move about the boss 16 and can be engaged with the left and right recesses 17 or the upper and lower recesses 18.

FIG. 4 is an expanded sectional view taken along the line AA of FIG. 3A, and shows a moving path of the convex portion 12 of the dial 10. As shown in the figure, the left and right recesses 17 are shallower than the upper and lower recesses 18 and the upper edge is formed with a smooth curved surface and a gentle slope connected to the seating surface. In addition, the seating surface has a slope that rises slightly from the left and right recesses 17 to the upper and lower recesses 18, and as shown in FIGS.
A substantially vertical wall surface is formed on the left and right edge portions of 8.

As shown in FIG. 3, dial covers 19, 20 for covering the outer peripheral surface of the dial 10 are provided upright on the lower and upper sides of the dial mounting seat 15, respectively.
The inner diameter of the dial mounting seat 15 is substantially equal to the outer diameter of the dial 10. The height of the lower dial cover portion 20 from the dial mounting seat 15 is equal to the disk portion 10 of the dial 10.
The thickness of the upper dial cover 19 is substantially equal to the total height of the dial 10 including the stopper 14. Therefore, the stopper 14 bulging slightly outward from the outer peripheral portion of the dial 10 interferes with the left and right upper dial covers 19, so that the rotation angle of the dial 10 is limited to about 180 degrees.

As shown in FIG. 1, a compression coil spring 21 is interposed between the dial 10 mounted on the dial mounting seat 15 and the trigger lever 7, so that the dial 10 is pressed against the dial mounting seat 15, and the convex portion 12 and the concave portion are formed. A moderation mechanism is constituted by the compression coil springs 17 and 18. The left and right sides of the dial 10 are exposed to the outside. In the unlocked position shown in FIG. 5A, the outer peripheral knurls of the stopper portion 14 project slightly laterally from the upper and lower cover portions 19 and 20, so that the grip 3 It is easy to perform a lock operation with the hand or finger holding the device.

In the unlocked position, the dial 10
Are fitted into the left and right recesses 17 of the dial mounting seat 15, and when the dial finger is put on the outer peripheral knurl of the dial 10 and the dial rotation operation is performed, the protrusion 12 is easily detached from the shallow recess 17. . When the dial 10 is rotated 90 degrees to the left or right, the dial 10 is brought into the trigger lock position as shown in FIG. 5B, and the convex portion 12 of the dial 10 is fitted into the upper and lower concave portions 18 and the stopper 10 is stopped. Since the portion 14 faces the rear surface of the trigger lever 7, a trigger lock state in which the movable range of the trigger lever 7 is limited is established.

In the trigger lock position, the dial 10
Side does not protrude outside the upper and lower cover portions 19 and 20, there is little possibility that the dial 10 comes into contact with surrounding objects. Further, the convex portion 12 of the dial 10 is fitted into the upper and lower concave portions 18, and the upper edge portion of the concave portion 18 is almost vertically stood up. It is difficult to release the engagement between the lock member and the concave portion 18, and there is no possibility that the locked state is released accidentally.

When the trigger lock is released, the dial 10 is grasped by a finger, the dial 10 is pulled up in the direction of the trigger lever 7 against the urging of the compression coil spring 21, and the dial 10 is rotated to form The engagement with the concave portion 18 is released. When the dial 10 is rotated left or right by 90 degrees, the outer peripheral portion of the stopper portion 14 comes into contact with the left or right upper dial cover portion 19 and the rotation is stopped,
The convex portion 12 and the left and right concave portions 17 are fitted and fixed to the unlocked position shown in FIG.

As described above, the trigger lock operation can be easily performed with a small finger, but the unlock operation is performed as two operations of pulling up and rotating the dial so that the lock is not accidentally released. .

[0022]

According to the present invention, as described in detail in the above embodiment, the locking of the dial of the trigger locking device in the trigger locking position is made different from the fixing force in the unlocking position, and the unlocking is performed in two stages. The operation is performed by the following operation. Further, since the side surface of the dial does not protrude to the side of the grip portion at the trigger lock position and the surrounding object is prevented from coming into contact with the dial, the possibility that the trigger lock is released unexpectedly is eliminated. It can contribute to improvement of safety.

[Brief description of the drawings]

FIG. 1 is a side view of a nailing machine according to an embodiment of the present invention.

FIG. 2 shows the dial of FIG. 1, (a) is a front view,
(B) is a side view, and (c) is a rear view.

FIG. 3 shows a dial mounting seat of a mechanism housing;
(A) is a front view, (b) is a side view.

FIG. 4 is a cross-sectional development view taken along line AA of FIG.

5A and 5B show a trigger lock device, wherein FIG. 5A is a front view in an unlocked state, and FIG. 5B is a front view in a trigger locked state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nailer 2 Mechanism housing 3 Grip 7 Trigger lever 9 Trigger lock device 10 Dial 10a Disk part 12 Convex part 14 Stopper part 15 Dial mounting seat 16 Boss 17, 18 Recess 19, 20 Dial cover 21 Compression coil spring

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B25C 7/00 B25C 1/04

Claims (1)

(57) [Claims] 1. A dial opposing a rear surface of a trigger lever is rotatably mounted on a front upper portion of a grip of a nail driver.
A stopper portion protruding forward is provided on a part of the front surface of the dial, and a trigger lock position in which the stopper portion is located in a path of the trigger lever by rotating the dial, and a lock release position retracted from the path. In a trigger lock device of a nailing machine, the dial (1) is formed so as to be switchable and provided with a moderation mechanism for fixing the dial at the trigger lock position and the unlock position.
0) and the dial mounting seat (1) of the grip (3).
5) is provided with a spherical convex portion (12), and the other is provided with the convex portion (1) at a trigger lock position and a lock release position.
2) and recesses (17, 18) for engaging with the spring (2).
The dial (10) is pressed against the dial mounting seat (15) of the grip (3) by the bias of (1) to form a moderation mechanism, and the recess (1) at the trigger lock position is formed.
8) The trigger locking device for a nailing machine, wherein the upper edge portion forms a substantially vertical wall surface, and the upper edge portion of the concave portion (17) in the unlocked position forms a gentle slope.