Importance

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Abstract

A fastener driving tool powered by internal combustion of an oxidizer/fuel mixture. The tool body contains a cylinder provided with a piston/driver assembly. The cylinder is surrounded by and connected to a return air chamber. A combustion chamber, provided with an ignition device, is located at the upper end of the cylinder. A positive trigger-actuated cam system, upon actuation of the trigger, is configured to open a fuel valve to introduce a measured amount of gaseous fuel from a source thereof into the combustion chamber; to thereafter open an oxidizer valve to introduce a measured quantity of gaseous oxidizer from a source thereof into the combustion chamber; to next actuate the ignition device to combust the oxidizer/fuel mixture causing the piston/driver assembly to drive a fastener and to fill the return air chamber with air under pressure; and finally to actuate a pilot valve operating an exhaust valve eliminating products of combustion from the combustion chamber, enabling air from the return air chamber to return the piston/driver assembly to its normal position. The sources of gaseous fuel and gaseous oxidizer comprise canisters of each replaceably mounted within the tool body.

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First Claim