Nail gun with safety portion mechanism for preventing misfires

Abstract

A nail gun has a free end 19a and central potion of a trigger arm 19 positioned within a trigger 11, on an upper end 12a of a safety portion 12 and at a plunger 17, respectively. When the trigger 11 is pivoted on its pivot end 16, pivoting movement of the trigger 11 moves a pivot end 18 of the trigger arm 19 to press the central portion of the trigger arm 19 into contact with the plunger 17 and, with the plunger 17 serving as a fulcrum, to press the free end 19a downward against the upper end 12a of the safety portion 12. If downward movement of the safety portion 12 is obstructed when the trigger 11 is pivoted, the upper end 12a contacted by the free end 19a of the trigger arm 19 serves as a fulcrum around which the trigger arm 19 pivots with movement of the trigger 11, whereupon the central portion of the trigger arm 19 presses the plunger 17 inward so that an activation switch 10 activates a blade 7 to eject a nail through a nose piece 5.

Description

[0001]This is a reissue of U.S. Pat. No. 6,820,788, which is a continuation of application Ser. No. 10 / 119,721 filed Apr. 11, 2002 now U.S. Pat. No. 6,641,018 which is a continuation of application Ser. No. 09 / 861,546 filed May 22, 2001; now U.S. Pat. No. 6,394,332; the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a nail gun that drives a nail through, for example, the hole of a connection clasp and to a nail gun that can accurately drive nails into a desired drive position.[0004]2. Description of the Related Art[0005]A variety of different types of clasp fixing nail guns have been proposed. U.S. Pat. No. 5,193,730 discloses a nail gun that separates nails one at a time from a nail band and supplies the nail to a nail injection hole of the nosepiece. The nail tip is protruded from the end of the nosepiece before the nail gun drives the nail.[0006]The nail gun further has a saf...

AI Technical Summary

Benefits of technology

[0009]It is an objective of the present invention to overcome the above-described problems and provide a nail gun that more easily allows visual confirmation of the nail tip location and that uses a simpler configuration, which improves reliability by helping prevent the danger of misfires.

[0011]With this configuration, a long stroke can be achieved for the safety portion. Therefore, the lower end of the safety portion can be separated from the nail tip in the initial condition, so that whether the nail tip is properly set in the clasp hole can be visually confirmed with ease. That is, the position where nails will be driven into the work piece can be accurately set.

[0012]Also, only the trigger arm is provided within the trigger and the safety portion is configured from only the upper safety portion and the lower safety portion. Operations are more reliable because the configuration is so simple.

[0014]As a result, a nail driving operation can be reliably performed.

Problems solved by technology

However, the intermediate lever can only be lengthened within the movement range of the trigger.

Therefore, it is difficult to lengthen the stroke of the work-piece contact member.

This makes it difficult to see the nail tip so that it is difficult to position the nail at the precise position where it is to be driven into the work piece.

Also, the intermediate lever and the operation lever are provided in a narrow space above the trigger and operate in a fairly complicated manner against urging force of springs.

A slight error in component or position dimensions, abrasion caused by friction, or dust, dirt, and the like clinging to components could easily become the cause of misfires.

As a result, reliability of the nail gun suffers.

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