Abstract: A speed governor for a rotational drive includes a rotor arranged to be driven by the rotational drive and located within a housing having a cylindrical inner side wall and an end wall. Centrifugal brake shoes are pivotally mounted on the rotor and contact the cylindrical side wall and the end wall during rotation of the rotor in a first direction and to move and remain out of contact with the cylindrical inner side wall and end wall during rotation of the rotor in the opposite direction. The brake shoes may be moved and retained out of contact with the end wall by riding up over a portion of the rotor.

Abstract: A seat belt retractor includes a spool, a single spring adapted to impart a rotational force to the spool to wind the seat belt onto the spool, and a mechanism to cause the spring to apply to the spool a first force, which is a relatively high force, only during the initial stages of extraction of the seat belt from the spool and during the final stages of retraction of seat belt onto the spool, and to apply a second lower force to the spool during the remaining part of the cycle of operation of the spool.