Machine element or mechanism – Gearing – Interchangeably locked
Patent
1982-09-08
1985-01-15
Herrmann, Allan D.
Machine element or mechanism
Gearing
Interchangeably locked
74375, 74369, 74421A, 192 481, 173163, F16H 308, F16D 2100, E21B 300
Patent
active
044932235
ABSTRACT:
A gear shifting speed change apparatus for a rotary electric tool such as a drill having an electric motor driving a first pair of unequal diameter pinion gears which are in continuous driving engagement with a second pair of pinion gears. The gears of second pair are independently mounted next to each other for free rotation on a shaft having an axial keyway. An axially sliding key is manually shifted to engage either one, but not both, of the second pair of gears by means of a pair of projections extending radially outwardly from the sliding key, one projection being axially outside the outer face of each gear and engageable with a recess in the outer face of the adjacent gear.
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Kishi Ichiro
Nakagawa Hisao
Herrmann Allan D.
Matsushita Electric & Works Ltd.
Quiray Arthur T.
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