Patent ID: 7096762

Claim:
A hand tool, comprising: an elongated column ( 101 ) that includes a main shaft; an output interface ( 102 ) connected to an end of the main shaft for driving a cutter or a tool carried thereon; a handle ( 106 ) coupled to the column ( 101 ) for driving the hand tool manually; a transmission gearbox ( 107 ) mounted on the column ( 101 ), the gearbox having an input end that is coupled to said handle ( 106 ) and having an output end that is coupled to the main shaft; a one-way drive arrangement ( 109 ) connected between the handle ( 106 ) and the transmission gearbox ( 107 ), so that torque is transmitted to the main shaft in a single direction via the transmission gearbox ( 107 ) to rotate the main shaft in a single direction when the handle ( 106 ) is manually reciprocated, torque being transmitted to the main shaft when the handle ( 106 ) is moved in a first direction but not when the handle ( 106 ) is moved in a second direction, wherein the transmission gearbox ( 107 ) has a transmission speed ratio, so that a transmitting operation of different speed ratio is formed between the main shaft and the handle ( 106 ) when said handle ( 106 ) is driven rotatably in the first direction; and an additional handle ( 104 ) connected to the column ( 101 ) and extending radially for holding the hand tool steady.