Patent ID: 8303449
Filing Date: 2012-11-06
Classification: B23B,B25B,B25F,F16H

Abstract:
1. A transmission assembly powered by an electric motor, the transmission assembly comprising: a transmission portion including an outer ring gear; a connector moveable relative to the outer ring gear between a first position, in which the connector is rotatable with the transmission portion in response to torque received from the motor, and a second position, in which the connector and the outer ring gear are non-rotatable; and a control mechanism operable to detect the operating current of the motor and compare the operating current to a threshold current; wherein the control mechanism is operable to move the connector from the first position to the second position in response to the motor operating current exceeding the threshold current; and wherein torque multiplication occurs through the transmission portion when the connector is in the second position, and wherein torque multiplication does not occur through the transmission portion when the connector is in the first position.