Importance

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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).

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First Claim