Internal-combustion engines – High tension ignition system – Safety device
Patent
1991-11-25
1992-07-28
Neill, Raymond A.
Internal-combustion engines
High tension ignition system
Safety device
123 46SC, 123597, 123598, 123613, 123615, F02P 1100
Patent
active
051333295
ABSTRACT:
For a combustion-powered tool, an ignition system is powered by a battery and is arranged so that a sudden discharge of a capacitor, as charged via an oscillator, produces a spark at a spark gap of a spark plug, so that the oscillator is enabled if a trigger switch is closed while a head switch is closed, but not if the trigger switch is closed while the head switch is opened, and if a battery voltage, as monitored, is not less than a reference voltage, and so that a silicon-controlled rectifier, which is arranged to produce a sudden discharge of the capacitor, is switched to a conductive state if the capacitor voltage, as monitored, and is not less than a reference voltage. The head and trigger switches, which are photoelectric, are polled intermittently to determine whether they are closed. Predominantly, solid-state components are used.
REFERENCES:
patent: 4483473 (1984-11-01), Wagdy
patent: 4483474 (1984-11-01), Nikolich
patent: 4522162 (1985-06-01), Nickolich
patent: 4930466 (1990-01-01), Osborne, Jr.
patent: 4949684 (1990-08-01), Gabiara
patent: 4986228 (1991-01-01), Tharman
patent: 5076250 (1991-12-01), Sasaki et al.
patent: 5101802 (1992-04-01), Reinhard
Rodseth William G.
Wendling Ernest J.
Buckman Thomas W.
Illinois Tool Works Inc.
Johnson Neal C.
Neill Raymond A.
O'Brien John P.
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