Reversible power wrench

Details Reversible power wrench Reversible power wrench

1995-10-31

1997-12-02

Hail, III, Joseph J.

Tool driving or impacting

Means to drive tool about an axis

Gear drive

173 47, 173217, 475290, 475299, B25F 500, B25B 2100

Patent

active

056925751

ABSTRACT:
A reversible power wrench includes a housing (10), a rotation motor, and a power transmission coupling the motor to an output shaft (21), and further includes a reduction gearing (20) with first planetary gearing (28) for transferring torque in the "forward" direction of rotation and a second planetary gearing (29) for transferring torque in the "reverse" direction of rotation. The first and second planetary gearings (28, 29) have rotationally interconnected sun gears (31, 39) and a common planet wheel carrier (34). The second planetary gearing (29) includes an inner set of planet wheels (37) intermeshing with the sun gear (39) and an outer set of planet wheels (38) intermeshing with the inner set of planet wheels (37) and engageable with a ring gear (40) which is axially shiftable between an "forward" position in which it engages the planet wheels (33) of the first planetary gearing (28) only and a "reverse" position in which it engages the outer sets of planet wheels (38) of the second planetary gearing (29) only. Speed responsive centrifugal weights (46) prevent by positive locking the ring gear (40) from being shifted during operation of the power wrench.

REFERENCES:
patent: 2046412 (1936-07-01), Reynolds
patent: 4255987 (1981-03-01), Ciolli
patent: 4274304 (1981-06-01), Curtiss
patent: 4364286 (1982-12-01), Ciolli
patent: 4573370 (1986-03-01), Clemens

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