Internal combustion powered tool for driving fastening elements

Details Internal combustion powered tool for driving fastening elements Internal combustion powered tool for driving fastening elements

1991-10-10

1993-05-25

Watts, Douglas D.

Elongated-member-driving apparatus

Explosive-type driving means

With plunger

227 8, B25C 108

Patent

active

052132471

ABSTRACT:
A portable, internal combustion power operated working device, such as a setting tool for driving fastening elements into a receiving material, has a combustion chamber (9) for burning an air-fuel mixture. A piston (7, 7a), guided within a guide cylinder (8), is driven by the gas pressure generated by the combustion of the air-fuel mixture. The combustion chamber volume can be varied by at least one displaceable combustion chamber wall (11). To prepare the air-fuel mixture, a metering chamber (67) holds a predetermined quantity of gaseous fuel. Fuel from the metering chamber along with air is drawn into the combustion chamber by a negative pressure produced in the combustion chamber when the combustion chamber volume is increased by displacing the at least one combustion chamber wall (11).

REFERENCES:
patent: 4200213 (1980-04-01), Liesse
patent: 4405072 (1983-09-01), Kindle et al.
patent: 4712379 (1987-12-01), Adams et al.
patent: 4717060 (1988-01-01), Cotta
patent: 4721240 (1988-01-01), Cotta
patent: 4759318 (1988-07-01), Adams
patent: 4773581 (1988-09-01), Ohtsu et al.

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