| 摘要 |
A fastener driving tool powered by internal combustion of an oxidizer/fuel mixture. The tool body contains a cylinder (8) provided with a piston/driver assembly (16). The cylinder (8) is surrounded by and connected to a return air chamber (11). A combustion chamber (27), provided with an ignition device, is located at the upper end of the cylinder (8). A positive trigger-actuated cam system (97), upon actuation of the trigger (57), is configured to open a fuel valve to introduce a measured amount of gaseous fuel from a source thereof into the combustion chamber (27); to thereafter open an oxidizer valve to introduce a measured quantity of gaseous oxidizer from a source thereof into the combustion chamber (27); to next actuate the ignition device to combust the oxidizer/fuel mixture causing the piston/driver assembly (16) to drive a fastener and to fill the return air chamber (11) with air under pressure; and finally to actuate a pilot valve (64) operating an exhaust valve (32) eliminating products of combustion from the combustion chamber (27), enabling air from the return air chamber (11) to return the piston/driver assembly (16) to its normal position. The sources of gaseous fuel (79) and gaseous oxidizer (78) comprise canisters each replaceably mounted within the tool body. |
