Patent GB-984436-A (GB)
Title: Improvements in disc brakes
Inventor: WELLS KENNETH JOHN
IPC: F16D65/095
Filed: 1961-11-23
Abstract: 984,436. Disc brakes, fluid pressure brakes. GIRLING Ltd. Nov. 15, 1962 [Nov. 23, 1961; March 21, 1962; June 30, 1962], Nos. 41880/61, 10789/62. and 25189/62 Headings F2E and F2F. A disc brake has friction pads removably mounted on guiding surfaces on a stationary torque-taking plate adjacent to the disc, the pads being applied to the disc by means located in or on a clamping member which is removably mounted on the guiding surfaces independently of the pads or is removably mounted on the pads themselves. In one embodiment, Figs. 1 and 2, the pads 19, 21 bonded or otherwise secured to backing plates 22 are mounted in a central gap in a sector-shaped dished pressing 14 in such a way that notches in the backing plate slidably engage with an axially extending flange 18 on the pressing 14 which is reinforced by steel strips 23. The flange 18 on the side next to the radial part of the pressing may be cut away to allow the backing plate on that side to be inserted radially and then moved axially or alternatively the backing plates may have lugs on each end engaging the outer surface of the flange so that the backing plate can be inserted radially, outward movement thereof being prevented by a clamping member 24. The pads are applied against the disc by a piston cylinder assembly 26, 27 in the clamping member 24 which can move axially in the gap and is retained in position on abutments 33 formed on the backing plates by a curved spring strip 28 the ends of which are detachably anchored to the flange 18 of the pressing 14 by means of pins 32 in co-operating eyes. Antifriction balls or rollers 34 are located between the strip and the clamping member 24. A dust shield 17 is carried by the pressing. In a modification, Fig. 4, in which the brake is operated mechanically by a hand lever, a lever 35 is pivoted between lugs 36 on the clamping member and actuates a plunger 38 which extends through an axial bore in the piston. An automatic adjusting device comprises a nut 42 screw-threaded on the plunger 38 and having ratchet teeth 45 which co-operate with a pawl tooth in a member 46 to rotate the nut when adjustment is required. Rotation of the plunger 38 is prevented by a pin 43. In another embodiment. Fig. 6, the backing plates are formed with rectangular notches, and bosses 66 on the ends of the clamping member, slidably engage with abutments 59 detachably secured to the axial flange 58 of the torque-taking member 55. The bosses 66 of the clamping member are fitted with rubber pads 67 to cushion vibration. In a further embodiment, Fig. 9, notches in the backing plates 82, 83 co-operate with inclined guiding surfaces 91, 92 in torque-taking guides 79 secured to an axial flange 77 of a member 76. The pads 84 are applied against the disc by a clamping member having notches formed therein which co-operate with the inclined surfaces 86, 87 and due to the inclined surfaces 92, 93 are carried round with the disc to provide a self-servo action. The clamping member follows the circumferential movement of the pads by movement along the surfaces 86, 87.