Importance

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Abstract

A repetitive striking type pneumatically operated nail gun for repeatedly striking, by a drive bit, a head of a nail for sinking the nail into a workpiece. The drive bit is connected to a piston reciprocally movably disposed in a cylinder. A return chamber is provided around the cylinder and in communication therewith. A head valve chamber is provided at a position above a head valve disposed above the cylinder. A drive air is provided for selectively applying compressed air to the head valve chamber or into the cylinder. A repetitive valve chamber is provided for providing selective communication with the return valve, the head valve chamber and a trigger valve. A cylinder guide is provided which prevents the cylinder from being moved in its axial direction in a case where the pressure within the return chamber becomes higher than that in the drive air chamber. A partition segment is provided to the cylinder guide for separating the return chamber from the drive air chamber. Further, an air passage is formed in the cylinder guide for fluidly connecting the repetitive valve chamber to the return chamber.

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First Claim