Safety catch mechanism of nail guns

A safety catch mechanism for nail guns comprises a through hole at the upper end of a magazine of the nail gun, an axle section protruded from one side of the magazine and pivotally coupled with a rotary rod, a blocking arm extended from the rear end of the rotary rod, a blocking plate bent from the rear end of the blocking arm for being extended and blocking the rear of the trigger; wherein a push arm is extended from the front end of the rotary rod; a limit bracket is movably embedded at the end of the push arm; a latch is defined on the limit plate to be protruded from an inner wall of the magazine; by means of the foregoing structure, if the magazine is loaded with nails, the latch can be pushed outward to drive the rotary rod to rotate, so that the blocking plate is separated from the rear of the trigger and allows users to cock the trigger.

FIELD OF THE INVENTION

The present invention relates to a nail gun assembly, more particularly to a nail gun assembly with a safety catch mechanism for preventing users from shooting the nail gun without nails.

BACKGROUND OF THE INVENTION

In general, a prior-art nail gun usually comprises a muzzle disposed at the front end of a nailing device in the main body of the nail gun, a magazine interconnectably disposed at the bottom of the muzzle for accommodating and storing nails. Further, a trigger is disposed on the handle of the main body of the nail gun for controlling the high-pressure airflow inside the nail gun and a firing pin of the nail gun for the shooting. By the shooting force of the firing pin, the nail in the muzzle can be shot into a work piece.

However, when users use such prior-art nail gun, the nails are shot continuously without knowing the current quantity of nails in the magazine. Therefore, after the nails in the magazine are exhausted, users may continue to cock the trigger. Some users even cock the trigger for several times intentionally to make sure there is no nail in the magazine before reloading the magazine with nails. As to the structure of the nail gun, shooting by a firing pin or other firing device without nails in the magazine may have adverse effects on the life of the nail gun or even cause damages to the nail gun.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a safety catch mechanism for preventing users from shooting without nails in the magazine. By means of a blocking plate and a rotary rod, if there is no nail in the magazine, the blocking plate will block the rear of the trigger and prevent the trigger from being cocked. If the magazine is loaded with nails, then the latch can be pushed to drive the push arm to rotate outward, such that the blocking plate is separated from the rear of the trigger, and thus allowing users to cock the trigger. Therefore, the present invention can effectively prevent user from shooting a nail gun without nails in the magazine, and thus preventing the structure of the firing device and firing pin from being damaged or the life of use shortened due to the firing without having nails in the magazine.

The technical measures taken by the invention to overcome the aforementioned shortcomings are given below:

A safety catch mechanism for preventing a nail gun from shooting without nails in the magazine comprises:a main body, having a trigger disposed on a handle of said main body, a muzzle disposed at the front end of the main body, and a magazine interconnectably disposed at the bottom of the muzzle; wherein a through hole is disposed on the upper wall of the magazine and an axle section protruded from one side of the magazine;a rotary rod, being movably disposed on the axle section, and having a push arm extended from the front end of the rotary rod, an embedding plate being bent from the front end of the push arm, an embedding groove disposed on the embedding plate, a blocking arm extended from the rear of the rotary rod and bent in the direction towards the trigger, and a blocking plate being bent from the rear end of the blocking arm and extended to the rear of the trigger; anda limit plate, being movably passed into the through hole of the magazine, and one end of the limit plate being movably embedded into the embedding groove of the rotary rod, wherein the limit plate forms a latch protruded from an inner wall of the magazine.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

To make it easier for our examiner to understand the objective of the invention, its structure, innovative features, and performance, we use a preferred embodiment together with the attached drawings for the detailed description of the invention.

Please refer toFIGS. 1 to 3for a safety catch mechanism of the present invention, which comprises:a main body10, having a trigger12disposed on a handle11, and a muzzle13disposed at the front end of the main body10, a magazine14disposed under the muzzle13and interconnected with the muzzle13, and a nail feeder15disposed in the magazine14for continuously pushing the nails stored in the magazine14out towards the muzzle13; wherein a through hole141is disposed on an upper wall of the magazine14; an axle section142is protruded from a side of the magazine14; and a transversal groove143is transversally disposed on the axle section142;a rotary rod20, disposed on an axial section21, and the axial section21having an axial hole211in the middle for allowing a screw rod212to pass through, and the axis of the rotary rod20being fixed in the transversal groove143of the axle section142; a push arm22being extended forward from the front end of the axial section21; an embedding plate221bent from the front end of the push arm22; an embedding groove222disposed on the embedding plate221; a blocking arm23being bent and extending in an aslant direction from the rear end of the axial section21towards the trigger12; a blocking plate231being bent from the rear end of the blocking arm23and extended to the rear of the trigger12; wherein a spring bracket24is disposed on an inner side of the rotary rod20, and a spring241is embedded in a position corresponding to a sidewall of the magazine14for providing the resilience for the rotary rod20; further, a press arm25is extended from the rotary rod20having a press button251bent from the end of the press arm25;a limit plate30, movably passing into the through hole141of the magazine14and one side of the limit plate30being movably embedded into the embedding groove222of the rotary rod20; wherein the limit plate30forms a latch31protruded from the inner wall of the magazine14.

Accompanied with the description of the foregoing structure, the principle of the movements for this invention is elaborated as follows:

Please refer toFIG. 4for the invention. If there is no nail in the magazine14, the spring bracket24of the rotary rod20will push the limit plate30towards the magazine14by a resilient force of the spring241, and then the blocking plate231will block the rear of the trigger12, such that if there is no nail in the magazine14, the blocking plate231will automatically block the rear of the trigger12to set the rotary rod20at a safety protection mode, and thus users cannot cock the trigger12. Such arrangement prevents the nail gun from being shot when there is no nail in the magazine, and thus protecting the structures including the firing device and the firing pin from being damaged by shooting without nails in the magazine or preventing the shortened life of use.

If nails are loaded in the magazine14, the nail feeder15in the magazine will continuously push the stored nails towards the muzzle13. When a nail is pushed to the top of the magazine14(as shown inFIG. 5), the nail will automatically push the latch31out from the magazine14and drive the rotary rod20to rotate, and the blocking plate231will be separated automatically from the rear of the trigger12and switched to a free shooting mode, such that a user can freely cock the trigger to shoot out a nail in the magazine14.

Further, accompanied with the disposition of the press arm25and the press button251, after the last nail in the magazine14enters into the muzzle13, there will be no nail in the magazine14to press the latch31, and thus the rotary rod20will resume its original position by the resilient force pushed by the spring241, and the blocking plate231will block the rear of the trigger12and return to the safety protection mode, which causes the situation of unable to shoot the last nail. Users may manually press the press button251of the rotary rod20to separate the blocking plate231and manually switch the rotary rod to the free shooting mode for the shooting. Alternatively, if a nail in the magazine14is stuck or has other situations, users may make use of the press button251to cock the trigger and eliminate the failing conditions.

In summation of the above description, the present invention enhances the performance of the conventional structure, and further complies with the patent application requirements and is submitted to the Patent and Trademark Office for review and granting of the commensurate patent rights.