PERFECCIONAMIENTOS EN UN MECANISMO DE AJUSTE AUTOMATICO DE UN FRENO DE TAMBOR

摘要

An internal shoe drum brake having a pair of hydraulically actuated brake shoes and an automatic brake adjusting mechanism. The brake adjusting mechanism includes a variable length strut disposed between the two brake shoes and actuated to increase in length by use of of a notched wheel which is rotated through engagement with a lever pivotally connected to one of the brake shoes and biased to rotate the wheel by use of a compression spring. The action of the one lever is controlled by a second lever also pivotally connected to the brake shoe and engageable by the strut and the one lever so that pivotal movement of the second lever permits a pivotal movement of the one lever of approximately three times the movement of the second lever away from the strut as great of the first lever.