Patent ID: 7024895

Claim:
An electrical steering lock device comprising: a lock shaft operative to protrude into and retract from a lock groove, formed on a steering shaft, such that the lock shaft assumes a protruding position to engage with the lock groove for blocking rotation of the steering shaft while assuming a retracting position to disengage from the lock groove for unlocking rotation of the steering shaft; a drive unit for protruding and retracting the lock shaft; and a drive member linked with the drive unit in engagement with the lock shaft, which serves as a cam follower, to protrude and retract the lock shaft with respect to the lock groove, wherein the drive member includes a cam having a cam surface with a contour shape to allow the lock shaft to move at a first speed, at which the lock shaft moves from inside the lock groove, to be slower than a second speed, at which the lock shaft moves outside the lock groove, and wherein a surface area of a sliding surface between the drive member and the cam follower includes a first surface area associated with the first speed and a second surface area associated with the second speed which is narrower than the first surface area.