Two-speed power tool
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United States of America Patent
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-
May 30, 1989
Grant Date -
N/A
app pub date -
Jun 17, 1987
filing date -
Jun 24, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A two-speed power tool having a rotation motor supported in a housing (10) and driving an output spindle via three planetary reduction gears (13, 25, 22). The ring gear (17) of a first planetary gear (13) is rotatable relative to the housing (10) as well as axially displaceable between a high speed position and a low speed position. A friction coupling (37) is associated with the housing (10) and the ring gear (17) of the first planetary gear (13) to lock the latter against rotation either relative to the planet wheel carrier (16) of the first planetary gear (13) when occupying its high speed position or relative to the housing (10) when occupying its low speed position. The ring gear (22) of a second planetary gear (19) which is located after the first planetary gear (13) is rotatable relative to the housing (10) and cooperates with a cam (40, 41) to shift the first planetary gear ring gear (17) against the action of a spring (32) from the high speed position to a low speed position as a certain reaction torque threshold level in the second planetary gear ring gear (22) is exceeded. The cam (40, 41) also provides a torque responsive release function which comes into operation at a reaction torque level corresponding to the desired maximum output torque of the tool.
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