Variable speed gearing in rotary electric tool
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United States of America Patent
Stats
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Jan 9, 1990
Grant Date -
N/A
app pub date -
Jun 29, 1988
filing date -
Jul 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A variable speed gearing apparatus for a rotary electric tool, including a differential gear mechanism for being mounted within a gear case, an intermediate gear and a clutch mechanism, a final planetary gear mechanism having internal gear with projections formed on the outer peripheral surface of the internal gear in the differential gear mechanism, a torque-setting cam arranged so that said projections of the internal gear of the final planetary gear mechanism are capable of being engaged with and disengaged from the torque-setting cam a first planetary gear mechanism having an internal gas, wherein the outer peripheral surface of the internal gear of the first planetary gear mechanism in the differential gear mechanism is tapered, a brake disk having a tapered surface corresponding to the tapered surface of the internal gear of the first planetary gear mechanism, the brake disk being arranged to be axially movable to be brought into pressure contact through the tapered surface of the brake disk with the tapered surface of the internal gear of the first planetary gear mechanism movably in a rotation-stopped condition, the brake disk being arranged so that it can be interlocked against axial movement with respect to the internal gear of the final planetary gear mechanism.
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