Pendulum operated inertia switch for safety belt mechanism with reciprocating cam follower

Claim 1

An inertia switch device comprising a supporting member, a vertically extending tubular socket member located on said supporting member, a switch including a contact element and a switch arm mounted on said support member and being mutually electrically insulated, said switch arm extending across the top of said socket member and being movable between an actuated and a deactuated position to alternatively engage and disengage said contact element and normally urged to its deactuated position, a pendulum depending from said supporting member for universal swinging relative to said supporting member and including a head member located at the upper part of said pendulum and being angularly movable with the swinging of said pendulum and having a cam defining upper face registering with the lower part of said tubular socket member, and means including a follower member engaging said cam and vertically slidably movable in said tubular socket member by said cam to an advanced raised position to move said arm to its actuated position when said pendulum swings a predetermined angle from its normal rest position and is slidably movable to a lower retracted position to permit the movement of said switch arm to its deactuated position when the angle of said pendulum relative to said rest position is less than said predetermined angle.