초록 ▼

A fastener applying tool is disclosed, powered by the gases produced from internal combustion of a fuel and air mixture. A piston connected to a fastener driver is slidably mounted within a cylinder to move reciprocally downwardly and upwardly through a driving and a return stroke. A combustion cham

A fastener applying tool is disclosed, powered by the gases produced from internal combustion of a fuel and air mixture. A piston connected to a fastener driver is slidably mounted within a cylinder to move reciprocally downwardly and upwardly through a driving and a return stroke. A combustion chamber is formed at the upper end of the cylinder. A compression chamber is formed at the lower end of the cylinder. A spark plug powered by a piezo-electric firing device, is located within the combustion chamber. The combustion chamber features a set of fan blades driven by an electric motor which is continuously in operation when the tool is in use. A main valve mechanism actuated by a set of lifting rods which are moved upwardly and downwardly when the tool is moved toward and away from the workpiece, is used to control the flow of fresh air through the combustion chamber. When the combustion chamber is isolated from the atmosphere and the fuel and air are thoroughly mixed, the spark plug is fired to explode the fuel and air mixture and force the piston through its driving stroke. The rapid discharge of combustion gases at the end of the driving stroke produces a thermal vacuum within the combustion chamber. Additional air supplied to the lower face of the piston from the atmosphere forces the piston through its return stroke.

대표청구항 ▼

A portable fastener driving tool comprising a housing, a cylinder in said housing, a piston in said cylinder and movable through a driving stroke from a driving to a driven position, a driver attached to said piston, a magazine for supplying fasteners into position to be driven by said driver, a com

A portable fastener driving tool comprising a housing, a cylinder in said housing, a piston in said cylinder and movable through a driving stroke from a driving to a driven position, a driver attached to said piston, a magazine for supplying fasteners into position to be driven by said driver, a combustion chamber formed within said housing and having said piston as one wall thereof, a fan in said combustion chamber and controls therefor to operate same to cause turbulence in said chamber, main valve means controlling the flow of air into said combustion chamber and the exhausting of the gases of combustion from said combustion chamber, means for providing fuel into said combustion chamber and igniting same for driving said piston from said driving position to said drive position to drive a fastener, and means for returning the piston to the driving position after a fastener has been driven.