Patent ID: 7380478

Claim:
A mechanical interlock comprising: a disk cam having a slot or recess, a linear cam follower having a preconfigured surface, said linear cam follower being movable between extended and retracted positions in the X direction by said disk cam whilst traveling on a cam surface of said disk cam; at least one linear roller follower having a roller and a follower, said linear roller follower changing rolling motion of said roller following said preconfigured surface of said linear cam follower to linear motion of the follower as said linear cam follower is displaced in said X direction by said disk cam; an operator interface lockable by actuation of said linear roller follower engaging said operator interface; a key switch affixed to said disk cam for actuating said disk cam to lock or unlock said operator interface via said linear cam follower; another disk cam having a slot or recess; and a direction switch affixed to said another disk cam; wherein said linear cam follower includes a locking pin arranged in said slot or recess of said another disk cam, said locking pin being positionable between a locking position and an unlocking position in said slot or recess as said linear cam follower displaces in the X direction, wherein said slot or recess of said another disk cam is adapted and arranged to allow said another disk cam to freely rotate when said locking pin is in the unlocking position and, when said locking pin is in the locking position, to prevent rotation of said another disk cam and allow said linear cam follower to displace between retracted and extended positions in the X direction.