Patent ID: 6016945
Filing Date: 2000-01-25
Classification: B25C

Abstract:
A fastener driving tool operable through an internal combustion driven piston, the tool comprising:(a) a driver body comprising a piston housing, a piston slidably housed in the piston housing, a driving member coupled to the piston; a combustion chamber defined by the body, piston housing, and piston; the piston and driving member being axially arranged and configured within the piston housing to drive a fastener upon combustion of a metered amount of gaseous fuel in the combustion chamber;(b) a pump system; the pump system comprising an intake system, an exhaust system, a pump sleeve, a pump housing, and the piston housing; the pump sleeve sealably contacting the piston housing and defining a space around the piston housing; the pump housing being arranged and configured to move axially in the space and to sealably contact the pump sleeve; a pump compression spring in the space axially biasing the pump housing; the intake system being arranged and configured for fluid communication with the combustion chamber; the exhaust system being arranged and configured for fluid communication with the space; and(c) a linear cam system and a fuel valve; the linear cam system being arranged and configured to activate the fuel valve upon compression of the pump housing into the space; the fuel valve being arranged and configured to dispense a metered amount of gaseous fuel into the combustion chamber upon activation.