Combustion gas powered fastener driving tool

Elongated-member-driving apparatus – With interlock means

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Details

227 10, B25C 104

Patent

active

044037228

ABSTRACT:
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.

REFERENCES:
patent: 3042008 (1962-07-01), Liesse
patent: 3858781 (1975-01-01), Obergfell et al.
patent: 3967771 (1976-07-01), Smith
patent: 4260092 (1981-04-01), Austin
patent: 4331277 (1982-05-01), Green

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