Power tool, in particular a hand-held compressed air screwdriver

Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means

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Details

192150, 81470, B23Q 506, B25B 2345, F16D 4320

Patent

active

044678770

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 pressurized air upon 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.

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patent: 4223745 (1980-09-01), Workman, Jr.

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