Patent GB-1371323-A (GB)
Title: Disc braking assembly
IPC: F16D65/02
Filed: 1973-07-25
Abstract: 1371323 Sliding-caliper spot-type disc brakes KELSEY-HAYES CO 25 July 1973 [11 Aug 1972] 35487/73 Heading F2E A disc braking assembly comprises a fixed supporting member and guide means on the supporting member and on a caliper member for sliding movement parallel to the disc axis, brake pad means associated with, and actuating means carried by, the caliper member for sliding the caliper member and actuating the brake pad means, and resilient hold-down means for maintaining the guide means in contact, the hold-down means comprising a plate fixed relative to one of the members and a formed spring, the formed spring having a first portion retainingly engaged with the plate and a second portion slidably engaged with the other of the members, the first and second portions of the spring being resiliently deflectable relative to each other for exerting a resilient force on the guide surfaces. As shown in Figs. 1, 2, caliper 29 slides by its horizontal surfaces 33, 34 and vertical surfaces 35, 36 in contact respectively with horizontal faces 25, 27 and vertical faces 26, 28 on arms 23, 24 of torque plate 22. The directly-actuated brake pad 39, Fig. 1, has a pair of offset ears (not shown) slidably supported on the arms 23, 24.  In one example of hold-down means, Figs. 5, 6, a plate 44, shown complete in Fig. 1, has notches 45, 46, and generally-rectangular openings 47, 48 from which extend notched-out portions 49, 51 respectively. A plate spring 53 lies under plate 44 and has an aperture aligned with an aperture 52 in plate 44 whereby both components may be secured to an arm of the torque plate. The plate spring 53 is retained under plate 44 by tabs 54, 55 and tangs 56, 57 and when the hold-down assembly is in position, rounded ends 61, 62 respectively of cantilevered arms 58, 59 respectively of spring 53 bear down resiliently on one of the machined upper surfaces 67 or 68 of the caliper, Figs. 1, 2, while rounded end 64 of cantilevered portion 63 bears down on one end of the backing plate of brake pad 39. In a second example of hold-down means Fig. 7, a formed wire spring 73 has its two ends 86, 87 retained in the vertical part of a T- shaped groove in the underside of plate 72 by tabs bent down and inwards from the plate, and straight portions 84, 85 located in the horizontal part of the T-shaped groove. Side portions 82, 83 are curved downwards so that straight portion 81 of the spring 73 lies below the general plane of plate 72. When the plate is secured by bolts through apertures 78, 79 to an arm of the torque plate, straight portion 81 bears down on the caliper. Portion 81 may be formed with an offset so as to engage the brake pad also.  In a third example, Fig. 10, the formed wire spring 103 resembles that of Fig. 7, except that the ends are separated (Fig. 10 is oriented the opposite way round to Fig. 7). A separate leaf spring 104 in the form of a cross has tabs 122, 123 which pass under the spring portions 118, 119 to hold them in the plate grooves 106, 108 and a portion 124 ending in a U-section overlapping the edge of plate 102. When in position in the disc brake assembly, spring portions 113, 104 bear resiliently on the caliper and brake pad respectively.