Patent ID: 7379272

Claim:
A disk drive comprising: a head slider opposed to a disk; a ramp member located at a position outside the disk; a head actuator member supporting the head slider, said head actuator member following a predetermined path when the head actuator member swings around a support shaft so as to get released from the ramp member; a lever supported on a first shaft for swinging movement; a weight supported on the first shaft for connection to the lever, said weight getting closer to the head actuator member based on swinging movement around the first shaft in a first direction; a restriction member designed to prevent the swinging movement of the weight around the first shaft in a second direction opposite to the first direction; and a swinging member supported on a second shaft for swinging movement, said swinging member being contacted with the lever swinging around the first shaft so that the swinging member gets into the predetermined path of the head actuator member through the swinging movement around the second shaft, wherein said restriction member comprises first and second contact surfaces designed to simultaneously generate rotation moments in opposite directions around the second shaft based on contact of the lever swinging around the first shaft in the second direction.