Machine element or mechanism – Gearing – Interchangeably locked
Patent
1983-12-30
1986-03-04
Braun, Leslie A.
Machine element or mechanism
Gearing
Interchangeably locked
173163, 418270, 74343, F16H 506, F16H 322, E21B 300
Patent
active
045733708
ABSTRACT:
A gear reversal mechanism for a hand held power tool is selectively operative to reverse the output of a unidirectional motor and provides a direct drive forward mode and an indirect drive reverse mode, with the selection therebetween being implemented by a manual shift collar operating a cam mechanism selectively to reorient the gear train and consequent direction of motor output. The shift collar is temporarily locked to the gear housing during tool operation by using the operative air pressure of the tool to expand a locking mechanism into locking engagement with such shift collar. With or without the locking mechanism, an exhaust shutoff shift interlock may be provided to permit exhaust air to exit the housing when the shift collar is in either its forward or reverse operating positions or alternatively to close the housing exhaust ports to block exhaust air flow to preclude motor operation when the shift collar is between its operating positions.
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Braun Leslie A.
The Rotor Tool Company
Wright D.
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