Importance

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Abstract

The present invention relates to a sealing device for the driver member of a pneumatically operated driving tool for fasteners. It comprises a working cylinder, a working piston slidably arranged in said working cylinder for movement between an upper and a lower dead center, a resilient stop member defining the lower dead center of the working piston movement, a driving member secured to said working piston and extending through an opening of said stop member, a control valve actuated by a trigger to alternatively connect a cylinder space above said working piston with a source of compressed air and to atmosphere, and a piston return space in communication with a cylinder space below said working piston. The device further comprises a mouth tool including a driving channel for guiding said driver member, a magazine opening into said driving channel, and a vent passage extending from the inner face of said stop member along said driving channel towards the forward end of said driver member, to vent the cylinder space below said working piston to atmosphere until the downwardly moving driver member closes off said passage. According to the invention the stop member comprises a recess facing said mouth tool, said recess sealingly receiving an extension portion of said mouth piece in a resiliently biased engagement between said recess and said extension portion. The sealing device provides for improvements with respect to the sealing as well as to venting function.

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First Claim