Safety structure of nail gun

A safety structure of a nail gun includes a trigger set including a trigger and a plate. The trigger is pivoted on a main frame to be moved toward a trigger device. The plate is pivoted on the trigger between the trigger and the trigger device. A linkage is pivoted on the main frame to press a free end of the plate. A spring urges the linkage to move back the linkage when the linkage is moved away from the trigger. A tappet is pivoted on the main frame to be moved by the linkage. An arm is on the muzzle for reciprocation, which has an extending portion extending to a front of the trigger. A cover is pivoted on the extending portion of the arm and covers the tappet and the linkage. The linkage leans on the cover so that the cover is moved by the linkage.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a nail gun, and more particularly to a safety structure of a nail gun.

2. Description of the Related Art

Typically, to prevent a nail gun from being triggered unexpectedly to hurt somebody, the nail guns are equipped with a safety for protection of user and people around.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a safety structure of a nail gun, which has a safety may be moved backwardly to expose a tip of a nail for aiming a target.

According to the objective of the present invention, a safety structure of a nail gun includes a trigger set including a trigger and a plate. The trigger is pivoted on a main frame of the nail gun to be moved toward the trigger device. The plate is pivoted on the trigger between the trigger and the trigger device. A linkage is pivoted on the main frame to press a free end of the plate. A spring urges the linkage to move back the linkage when the linkage is moved away from the trigger. A tappet is pivoted on the main frame to be moved by the linkage. An arm is on the muzzle for reciprocation, which has an extending portion extending to a front of the trigger. A cover is pivoted on the extending portion of the arm and covers the tappet and the linkage. The linkage leans on the cover so that the cover is moved by the linkage.

DETAILED DESCRIPTION OF THE INVENTION

As shown inFIG. 1toFIG. 3, a safety structure of the present invention is mounted on a conventional power or pneumatic nail gun. The nail gun includes a main frame1, which has a muzzle2, a handle3, a trigger device4and a magazine5. The safety structure of the present invention includes:

A trigger set10includes a trigger11and a plate12. The trigger11has an end nearby the trigger device4which can be swung toward the trigger device4. The plate12has an end pivoted on the trigger11wherein the plate12is located between the trigger11and the trigger device4.

As shown inFIG. 3, a linkage20has an end which abuts against a free end of the plate12and another end with a protrusion21and two posts22beside the protrusion21. The linkage20is engaged on the main frame1nearby the trigger11so it can be moved toward the trigger11or away from the trigger11.

A spring30has an end mounted on the main frame1and the other end fitted to the protrusion21of the linkage20so that the linkage will be moved back by the spring30after it is moved away from the trigger11.

A tappet40has an end pivoted on the main frame1and another end with an inclined portion41. The inclined portion41is engaged on the linkage20to permit the posts22to push the inclined portion41and swing tappet40.

An arm50is engaged around the muzzle2for reciprocation along the muzzle2. The arm50has an extending portion extending to a front of the trigger11.

A cover60has an end pivoted on the extending portion of the arm50and a free end with a chamber61. The tappet40and the linkage20are received in the chamber61wherein the tappet40is located between the linkage20and the cover60. The cover60has two gaps62on opposite sides of the chamber61to receive the posts22of the linkage20therein when the cover60covers the tappet40and the linkage20.

An elastic member70is mounted on a proximal end of the cover60to urge the cover60to normally cover the tappet40and the linkage20.

With the structure described above, there are two conditions in operation of the present invention. First condition is an unpercussion condition. As shown inFIG. 3andFIG. 4, when the muzzle2of the nail gun is not pressed on an object, the trigger11of the trigger set10is moved toward the trigger device4together with the plate12to press the trigger device4, and the free end of the plate12is moved away from the trigger device4to move the linkage20forward. After the linkage20is moved, the linkage20will pull the spring30and push the inclined portion41of the tappet40by the posts22to move the tappet upwardly that will move the cover60outwardly to move the linkage20freely. As a result, the plate12having not enough pressure to activate the trigger device4and the nail gun will not fire a nail.

The second condition is a percussion condition. As shown inFIG. 3andFIG. 5, when user presses the muzzle2of the nail gun on an object, the arm50is move backwardly. The trigger11of the trigger set10is moved toward the trigger device4together with the plate12and the free end of the plate12will be moved away from the trigger device4by the trigger device4to move the linkage20forward. In the same time, because the arm50and the cover60are moved backwardly, the posts22of the linkage20will be in the gap and engage the cover60. Further because the arm50is pressed by the object and can not be moved anymore, the cover60also can not be moved, so that the tappet40will not be moved away by the posts22of the linkage20, and the cover60will not be moved away by the tappet40. Accordingly, the plate12has enough pressure to press the trigger device4because the trigger11keeps being pressed. As a result, a tip of a nail will be exposed to aim the object that may prevent user from hurt because the nail gun is not touching the object and triggered unexpectedly.

The description above is a few preferred embodiments of the present invention and the equivalence of the present invention is still in the scope of the claim of the present invention.