Electronic two-hand safety system for power tools

Details Electronic two-hand safety system for power tools Electronic two-hand safety system for power tools

1981-10-22

1985-01-15

Meister, James M.

Tool driving or impacting

Drive control operable by hand engaging manipulating handle

192129A, 192131R, 200DIG1, 200157, F16P 320

Patent

active

044933770

ABSTRACT:
To permit operation of the power tool only if both hands of an operator are engaged, the tool is formed with a handle portion which has a sensing surface thereon, electrically coupled to a current flow sensing circuit, preferably including an opto-coupler or a field-effect transistor (FET) circuit which permits firing of a triac, thyristor, or the like only if current flows over the sensing surface by area contact therewith. The sensing surface is energized, preferably, from a resistive or capacitative voltage divider; the capacitative voltage divider has the advantage that the triac firing circuit can cause the triac to fire during null or zero crossings of ac supplied power. If a locking-type switch is used, two handles or touch-areas are needed; if a spring-loaded switch is provided, it can function as one safety element, and a touch-area sensing surface as the other.

REFERENCES:
patent: 3641410 (1972-02-01), Vogelsberg
patent: 3651391 (1972-03-01), Vogelsberg
patent: 3761736 (1973-09-01), Malcolm
patent: 3854055 (1974-12-01), Sparks

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