Elongated-member-driving apparatus – With control means responsive to sensed condition – Work-responsive
Patent
1985-12-27
1987-07-14
Bell, Paul A.
Elongated-member-driving apparatus
With control means responsive to sensed condition
Work-responsive
227131, B25C 106
Patent
active
046797190
ABSTRACT:
An electronic control system for a pneumatic fastener driving tool of the type having a body containing a cylinder with a piston mounting a driver, a firing valve above and normally closing the upper end of the cylinder, and a space or volume above the firing valve. The volume above the firing valve is normally connected to a source of air under pressure to maintain the firing valve closed. When this volume is connected to exhaust the firing valve opens allowing air under pressure within the cylinder above the piston to cycle the tool. The electronic control system comprises a solenoid actuated valve which, when actuated, connects the volume above the firing valve to exhaust to cycle the tool, a source of electrical current and a control circuit. The control circuit establishes a desired mode of operation for the tool and has inputs from at least a manual trigger and a safety and interprets the inputs including their presence or absence and their sequence. When the inputs satisfy the desired mode of operation, the control circuit will generate an output signal to the valve solenoid and the tool will cycle.
REFERENCES:
patent: 3278104 (1966-10-01), Becht et al.
patent: 3278106 (1966-10-01), Becht et al.
patent: 3964659 (1976-06-01), Eiben et al.
patent: 4298072 (1981-11-01), Baker et al.
patent: 4500938 (1985-02-01), Dulin
patent: 4516713 (1985-05-01), Meijer
patent: 4556803 (1985-12-01), Weigert
Bell Paul A.
Senco Products Inc.
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