Two-speed power tool

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

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Details

81476, 74674, B25B 2314

Patent

active

048341924

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.

REFERENCES:
patent: 3610343 (1975-10-01), Bratt
patent: 4215594 (1980-08-01), Workman, Jr. et al.
patent: 4513827 (1985-04-01), Dubiel
patent: 4650007 (1987-03-01), Fujita et al.

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