Patent GB-294894-A (GB)
Title: Improvements in brakes and brake mechanism
IPC: F16D51/50
Filed: 1928-07-30
Abstract: 294,894. Hallot, P. July 30, 1928. [A Specification was laid open to inspection under Sect 91 of the Acts, July 30, 1928]. Addition to 252,227. Actuated by running axle or wheel and speed regulators; blocks acting on drums; hand; electric and magnetic. -The brake of the parent Specification is modified so that the reaction of the friction bands multiplies the power with which-all the brake shoes are applied irrespective of the direction of rotation. Also positive means are provided for holding the bands in contact with the brake segments. A brake is shown comprising a band pressed against a drum by two shoes connected by a floating pivot and actuated by a cam. The shoes have recesses adjacent their pivot or the cam on which move lugs on each end of the band. One of the lugs will engage an end of its recess when the brake is applied in either direction of travel. Clips on the shoes hold the band in contact with the brake segments. In a modification, the lugs on the band engage stops on the shoes and the band is provided with a T- section rib fitting in a recess in the shoes. In a further modification, Fig. 6, lugs 2, 3 constructed as shown in Fig. 7, engage the shoes 5, 6 respectively according to the direction of rotation. In a further modification, each shoe is provided with a band, one end of each band abutting against a fixed stop and the other end against stops on the shoes. A floating cam may be used and a fixed stop which absorbs the reactions of the brake segments. The Specification as open to inspection under Sect. 91 (3) (a) also describes a brake as shown in Fig. 1 (Cancelled) comprising a looselymounted quadrant 1 adapted to be pressed into engagement with the drum S by the brake segment 5 on which the quadrant moves freely and operates the vehicle front wheel brakes by means of a rod 39. On reverse movement the quadrant remains locked against the edge 5<1>, or the front brakes may be operated by a cable passing over a pulley on the disc 9. Brakes comprising centrifugal weights may have the brake drum automatically coupled to the rotary spindle by spring-pressed pawls, which are forced into inoperative position on forward travelling by shaped parts of the drum. In Fig. 26 (Cancelled) stops occupy the ends of the same diameter. In other Figures are shown stop pins arranged on the closing disc of the brake and working in recesses in the brake shoes or against lugs thereon to take the thrust of the brake segments. The recesses are made sufficiently wide to allow for wear of the brake lining. The position of the stops may be adjustable on the disc. The brake shoes may be operated by articulated levers and a cable passing over a pulley. By suitablv arranging the pulley the braking effort exerted on the two steering wheels of a vehicle may be varied when turning a corner. The articulated levers are also shown operated by a screw and thrust plate acting on a roller, the spindle of which connects the articulated levers. In Fig. 14 (Cancelled) the shoes 5, 6 form a movable articulated collar operated by levers 14, 15 connected by means of a slot n. The shoes are adapted to strike a stop 10 either in forward or reverse movement. Another Figure shows the shoes adapted to be separated by a cam, the spindle of which is arranged on a floating support or in a slot, and the shoes abut against a stop between them. In Fig. 23 (Cancelled) the cam 7 acts on the shoes by means of levers 208, 209 pivoted to them and to a bar 213 enabling the shoes to move freely and abut against a stop 10. The mechanism is guided by the flanges of rollers 7<1>, 7<11> acting on the levers 208, 209, or by a forked member acting on the bar 213. In another modification, is shown how the cross-section of the cam can be varied for regulating the braking effort, flanges on the cam guiding the levers 208, 209. The shoes are freely articulated and held in position by four guides. In Fig. 20 (Cancelled) a part 10 acts as both the abutment for the shoes and the holder for cams 7, 7<1> adapted to move in a channel in the holder and compress a spring W. In an arrangement for actuating brakes by means of the vehicle transmission the brake pedal by means of a balance lever actuates both a cam of a servobrake on the transmission and also the frontwheel brakes. One of two nipples on the servobrake actuates one of two arms of a lever according to the direction of movement of the vehicle, and the lever is connected to the front vehicle brake connections to exert an additional effort thereon. The servo-brake may be mechanical, electrical or fluid-pressure. A spring may be arranged in the front-wheel brake connections. In a construction using an electric servo-brake the brake rod is operated by a lever acted on by an electromagnet supplied with current by a battery under the control of a distributor operated by the brake pedal which also acts on the brake rod by means of a dog thereon. Two conjugated brake pedals are shown so that the driver may operate one or two brakes with or without a servo-brake. Specifications 139,818. 154,174, and French Specifications 373,705, 474,518, 548,315 and 573,705 and its addition 26469 are referred to. This subject-matter does not appear in the Specification as accepted.