Fuel system for combustion-powered, fastener-driving tool

Details Fuel system for combustion-powered, fastener-driving tool Fuel system for combustion-powered, fastener-driving tool

1992-11-13

1993-11-23

Argenbright, Tony M.

Internal-combustion engines

Free piston

Single chamber; one piston

123484, B25C 108

Patent

active

052634396

ABSTRACT:
For use in a combustion-powered, fastener-driving tool having a combustion chamber, a source of a combustible fuel, and a switch that must be closed to enable the tool, a fuel system comprises a fuel injector, which includes a normally closed, solenoid-energized valve between the fuel source and the combustion chamber, and an electronic circuit responsive to the switch for energizing the solenoid to open the valve when the switch is closed and for deenergizing the solenoid after a time interval. A resistive-capacitive network defining the time interval includes a first resistor, a second resistor arranged to be selectively connected in parallel therewith, a thermistor connected in parallel therewith, and a variable resistor connected to the parallel resistors. Another network effects a time delay between closure of the switch and energization of the solenoid. Optionally, another network varies the time interval in response to ambient pressure.

REFERENCES:
patent: 2926642 (1960-03-01), Huber
patent: 3042010 (1962-07-01), McCrory et al.
patent: 3769950 (1973-11-01), Braun
patent: 3967688 (1976-07-01), Inenaga et al.
patent: 4200213 (1980-04-01), Liesse
patent: 4483474 (1984-11-01), Nikolich
patent: 4739915 (1988-04-01), Cotta
patent: 5133329 (1992-07-01), Rodseth et al.
patent: 5181495 (1993-01-01), Gschwend et al.

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