GB257780A - Device for transmitting motion applicable among other uses to actuating the brakes of automobiles and the like - Google Patents

Abstract

257,780. Andersson, G. K. K. Nov. 11, 1925. Force-transmitting mechanism; compensating for wear.-Mechanism more particularly applic. able for operating band brakes and comprising toothed gear members adapted to give a quick movement for bringing the band into engagement with the drum followed by a relatively slower tightening movement is combined with an adjusting device by which the extent of the movement during which the slack is taken up can be varied in relation to the tightening movement. Adjustment may thus be made for wear or other purpose. Rods 1, 1<1> connected, respectively to the operating pedal and the brake are connected respectively to a slide 15 working in a fixed guide 16 and to an arm on a toothed wheel 18 pivoted on the slide and engaging a rack 21 formed on the guide. The arrangement is such that during the initial movement to apply the brakes, the rod 1<1> moves more rapidly than the rod 1 by reason of the rolling movement of the wheel 18 on the neck 21, the movement of the rods becoming equal however when the pivots 19, 14, 13 are in alignment as shown. The toothed wheel may be composed of two segments of different radii adapted to co-operate alternately with each rack. The guide and rack 16 is secured to a casing 4 and to effect the adjustment a nut 7 has right- and left-handed screw-threaded engagement with a fixed rod 8 and a rod 6 forming part of a bar secured to the casing 4, which may thus be shifted to vary the initial position of the pivot 14 and thus to take up wear in the brake.