ES232784U - Drum brake with internal shoes. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Drum brake with internal shoes, characterized in that it comprises a pair of brake shoes which can be expanded, against the action of the shoe recovery spring means, alternatively by the fluid-operated service brake device or by the manually operated auxiliary brake device; a column of adjustable length that transmits the loads applied manually between the shoes but that is released from the load when the service brake device comes into action, the column comprising a pair of relative rotation elements screwed together, and a ratchet device for effecting a relative rotation of the elements in order to lengthen the column in response to the excess travel of the brake shoes upon entry of the brake in action, whereby the ratchet device comprises a ratchet wheel secured to one of the rotating elements of the column and the pawl of the pawl is pushed by a ratchet pawl spring device in a direction that makes adjustment of the column, applying the spring device of the pawl in the column an intermediate force to the necessary to effect the relative rotation of the elements of the column when the recovery spring device acts to tr before the column and the necessary when loading; of the recovery spring device is released by the service brake, the relative rotation being carried out only when the service brake comes into action to release the load imposed on the column by the recovery spring device, and because the pawl of the ratchet and the hand brake lever that is part of the auxiliary brake device is both mounted on one of the brake shoes to rotate about a common pivot axis. (Machine-translation by Google Translate, not legally binding)