Patent GB-940769-A (GB)
Title: Disc brake
IPC: F16D65/14
Filed: 1961-10-10
Abstract: 940,769. Disc brakes. BENDIX CORPORATION. Oct. 10, 1961 [Oct. 20, 1960; Nov. 21, 1960], No. 36357/61. Heading F2E. A disc brake comprises a cage structure supported by and axially movable with respect to a fixed support and carrying a pair of friction members adapted to be brought into engagement with the opposite faces of the disc to be braked. The cage structure comprises two interconnected circumferentially spaced brackets straddling the disc and restraining the friction members against circumferential movement. The circumferential effects to which the cage is subjected when the friction members are brought into engagement with the disc are transmitted to the support through one or the other of the brackets, which engage anchoring surfaces on the support. In one embodiment, Figs. 2 and 6, the cage comprises two spaced brackets 20, 22 which are guided by engagement of lugs 24, 26 on the fixed support 16 with apertures 35, 39, a fluid motor housing 28 bolted to the brackets, and a friction member 32 which has spaced segments of friction material 40 whose backing 37 is notched at 42, 44 so that it will fit in recesses 46 of the brackets 20, 22 and is clamped therein by a bolt 36. The cage is free to move pivotally on the lugs 24, 26 in planes transverse to the disc 10 and is axially slidable on surfaces 21, 23 of the support on which surfaces the braking torque is taken. A resilient spring 87 is placed between each bracket 20, 22 and its anchoring surface 21, 23 to cushion anchoring load and prevent brake noise. The other friction member 34 includes a backing 48 having turned back flanges 50, 52 and additional flanges 54, 56 which fit within slots 35, 39 to guide the member in its lateral movement towards and away from the disc 10. Within the fluid motor housing 28 is a fluid responsive piston 64 having an 0-ring seal 66 and a rubber sealing boot 68. Fluid pressure is applied through port 76 via passages 79, 78 and grooves 83 to power chamber 70. Slidably mounted on a stem 72 having a head 73 are two flanged sleeves 74, 82. A retracting spring 81 is compressed between the flange of sleeve 82 and a ring 77 frictionally held in the bore 80 of the cylinder. The ring 77 and the end of the sleeve 82 are spaced a predetermined distance apart which if exceeded, i.e. on wear of the friction linings 34, 40, will cause on application of the brake the end of the sleeve 82 and the ring 77 to abut so as to move the latter axially along the bore 80 and maintain the predetermined spacing. A spring 75 is compressed between the flange of the sleeve 74 and the end of the cylinder. In a modification, Fig. 9, the brake incorporates a parking brake by which the friction members can be mechanically actuated. A pair of levers 96 having openings 98 for connecting to a cable which is pulled to apply the brake are fastened by a pin 99 to a second pair of levers 100 which are mounted for pivotal movement on a pin 102 on the fixed support 16 and have rounded abutment surfaces 104 which contact shoulder 106 of pin 108 extending through an opening in the support member to bear against friction member 34. Lever 96 have rounded abutment surfaces 112 to engage the head 114 at the end of an adjusting screw 116. In another embodiment the fixed support is constructed so that the external faces of the two brackets bear against the anchoring surfaces. In a further embodiment, Fig. 23, the fixed support 200 has a transverse flange 206 and is provided with two sets of lugs 210, 212; 214, 216 (the latter not being shown) which engage with slots 240, 242; 244, 246. The transverse flange 206 is provided with convexly curved anchoring surfaces upon which the cage can move axially and angularly.