Patent ID: 6655473
Filing Date: 2003-12-02
Classification: B25B,B25F,F16H

Abstract:
A hand tool with an adjustable rotational speed and torsion force, comprising:a hollow body; a motor securely received in the hollow body and having an output axle partially extending out of the motor; a shaft rotatably and movably received in the hollow body and driven by the output axle of the motor, the shaft having a first end connected to the output axle of the motor and a second end formed a first main gear; a first planet gear set mounted in the body and longitudinally connected to the second end of the shaft, the first planet gear set being driven by the shaft and including: a first rotator being rotatable relative to the body and having a first hole longitudinally defined in the first rotator for receiving the second end of the shaft, the first hole having a toothed portion form near a bottom thereof and the first main gear selectively engaged to the toothed portion of the first hole; a first stub longitudinally extending form the first rotator and co-axially corresponding to the shaft; a second main gear formed on a free end of the first stub; a first ring secured on an inner periphery of the body and surrounding the first rotator such that the first rotator is rotatable relative to the first ring; and two first gears rotatably mounted in the first rotator and partially laterally extending into the first hole for selectively engaging to the first main gear, each first gear laterally extending through the first rotator and engaged to a toothed inner periphery of the first ring; a second planet gear set mounted in the body and longitudinally connected to the first planet gear set, the second planet gear set being driven by the first planet gear set and including: a second rotator being rotatably relative to the body and having a second hole longitudinally defined to receive the first stub of the first rotator; a second stub longitudinally extending from the second rotator through the body, the second stub co-axially corresponding to the first stub of the first rotator; a second ring secured on the inner periphery of the body and surrounding the second rotator; and two second gears rotatably mounted in the second rotator and partially laterally extending into the second hole for engaging to the second main gear of the first planet gear set, each second gear laterally extending through the second rotator and engaged to a toothed inner periphery of the second ring; and a tool holder securely connected a free end of the second stub of the second planet gear set, the tool holder longitudinally and co-axially corresponding to the second stub of the second planet gear set for clamping a working piece.