Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1979-04-20
1982-03-23
Mackey, Robert
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
91 59, 81470, B23Q 506, B25B 23145
Patent
active
043208061
ABSTRACT:
A pneumatic screwdriver or nutsetter includes a manually actuated electrical switch and a solenoid operated motive air shutoff valve which includes a spring biased reset element for moving the shutoff valve closure element from a valve closed position to a valve open position prior to introduction of compressed air to the tool motor. The reset element is retracted away from the closure element by pressure air on startup of a tool operating cycle. The closure element is released upon deenergization of the solenoid at a predetermined signal to close the shutoff valve. In an alternate embodiment the switch is replaced by a pneumatic valve and the reset element is pressure air biased to move the shutoff element from the shutoff valve closed position to the open position.
REFERENCES:
patent: 3387669 (1968-06-01), Wise, Jr. et al.
patent: 3406762 (1968-10-01), Kramer
patent: 3512590 (1970-05-01), Tibbott
patent: 3616864 (1971-11-01), Sorensen et al.
patent: 4078618 (1978-03-01), Depagter et al.
patent: 4191282 (1980-03-01), Schoeps
patent: 4223745 (1980-09-01), Workman, Jr.
Koltermann Jurgen K. D.
Mattheiss Eugen
Polzer Bernhard J.
Stein Dieter W.
Deutsche Gardner-Denver G.m.b.H.
Mackey Robert
Martin Michael E.
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