Tool driving or impacting – Means to drive tool about an axis – Electric motor
Reexamination Certificate
2007-01-09
2007-01-09
Tawfik, Sameh H. (Department: 3721)
Tool driving or impacting
Means to drive tool about an axis
Electric motor
C173S216000
Reexamination Certificate
active
10547494
ABSTRACT:
A power tool comprises a housing (10) with a cylindrical outer surface (11), a rotation motor, and a power train including a reverse gearing (14, 24) with a first planetary gearing (14) for “forward” operation and a second planetary gearing (24) for “reverse” operation, and a ring gear mechanism (19, 26, 40) for establishing a reaction torque support relative to the housing (10) by coupling either one of the first planetary gearing (14) and the second planetary gearing (24) to the housing (10) to thereby shift the power transmission from a “forward” operation mode to a “reverse” operation mode, wherein the gear ring mechanism comprises a separate rotatable ring gear (19, 26) for each planetary gearing (14, 24) and an axially displaceable coupling ring (40) for alternative engagement with the ring gears (19, 26). The coupling ring (40) is connected to a maneuver ring (53; 153) which is rotatably supported on the outer surface (11) of the housing (10), and screw mounted sleeves (48, 49) extend radially from the coupling ring (40) to co-operate with helical slots (50) in the housing (10) for transforming rotational movement of maneuver ring (53) to axial displacement of the coupling ring (40). An open ended leaf spring element (60; 160) is mounted inside the maneuver ring (53; 153) and pre-tensioned to embrace the outer surface (11) of the housing (10), thereby forming a releasable arresting means for the maneuver ring (53; 153). The leaf spring element (60; 160) has apertures (71, 72; 171, 172) for locking engagement with shoulders (66, 67; 166, 167) formed by wire elements attached to the housing (10).
REFERENCES:
patent: 4255987 (1981-03-01), Ciolli
patent: 4274304 (1981-06-01), Curtiss
patent: 4364286 (1982-12-01), Ciolli
patent: 4573370 (1986-03-01), Clemens
patent: 5692575 (1997-12-01), Hellstrom
Atlas Copco Tools AB
Chukwurah Nathaniel
Frishauf Holtz Goodman & Chick P.C.
Tawfik Sameh H.
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