GB668116A - Improvements in or relating to hand brake operating mechanisms - Google Patents

Abstract

668,116. Hand brakes. BERLIET & CIE. Jan. 17, 1950 [Jan. 31, 1949], No. 1265/50. Class 103 (i). A vehicle hand-brake mechanism which is so arranged that an initial brake application, in addition to the taking-up of play, is obtained by moving the hand-lever in one direction, while a progressively increasing braking action results from return movement of the handlever, comprises a brake-operating cable passed around a pulley mounted on a support rotatable about the same axis as the hand-lever, a toothed segment movable with the pulley and cooperating with a first pawl, a second fixed toothed segment co-operating with a second pawl on the pulley support, and means for effecting disengagement of the pawls to release the brake. As shown in Fig. 2, the brake cable 8 passes around a pulley 7 carried at the lower end of a lever 5 mounted on the shaft 2 supporting the hand lever 1, the lower end of the latter being connected to an arm on the pulley by a link 18. The upper end of the lever 5 carries a pawl 12 movable over a fixed toothed segment 4 and a rack on the pulley 7 is engaged by a second pawl 10 on the lever 5, the two pawls being connected by a slotted link 14. For the initial brake application the lever 1 is moved to the left, the lever 5 remaining fixed and the pulley 7 being rotated by the link 18 to wind on the brake cable 8, Fig. 3 (not shown). Upon return movement of the lever 1, the levers 1, 5 and the pulley 7 are rendered rigid by the pawl 10 so that direct tension is applied to the cable 8. The lever 1 is retained in position by engagement of the pawl 12 with the fixed segment 4, Fig. 4 (not shown). Release of the brake is effected by depressing a button 16 at the top of the hand-lever which, through a link 15, effects disengagement of the pawl 12, and then moving the lever 1 to bring the lever 5 against an adjustable stop 20 to disengage the second pawl 10, after which the hand-lever may be returned to its initial position. In the modification shown in Fig. 5 the lower end of the hand-lever 31 is attached to the brake cable 60, which passes around a pulley 36, the support for which carries an arcuate rack 38 engaged by a pawl 47 on the hand-lever, and also carries a second pawl 39 engaging a fixed rack disposed parallel to the rack 38. During the initial brake application the cable 60 is drawn around the pulley 36, the pawl 47 passing over the rack 38, and on the return movement of the hand-lever to apply direct tension to the cable, the pawl 39 engages its associated rack to retain the hand-lever in its adjusted position. The pawls are released by a lever 50 and rod 49 actuating members 43, 42, 46.