Elongated-member-driving apparatus – Explosive-type driving means – With plunger
Patent
1986-07-02
1988-04-26
Kazenske, E. R.
Elongated-member-driving apparatus
Explosive-type driving means
With plunger
123465C, B25C 108
Patent
active
047399155
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.
Kazenske E. R.
Senco Products Inc.
Wolfe James L.
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