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摘要

A high pressure stud gun or fastener driving tool includes a housing providing a cylinder, a combustion chamber, and a drive track to which studs or fasteners to be driven are supplied. A piston movable in the cylinder actuates a driver slidable in the drive track. A fluid controlled main valve is normally biased by compressed air supplied to a large area valve piston surface to close communication between the combustion chamber and the cylinder. A control assembly on a housing handle supplies a metered charge of combustible material to the chamber and initiates combustion thereof. A small area valve piston surface communicating with the combustion chamber opens the main valve when the gas resulting from combustion reaches a relatively high pressure, and this gas then enters the cylinder to actuate the fastener driver through a power stroke. The control assembly also includes valving for opening and closing the main valve and for purging the combustion chamber and the cylinder of combustion products. The pressure of the compressed air supplied to the large area valve piston surface controls the pressure of the gas admitted to the cylinder, and adjustable regulators on the compressed air source control the driving force applied.