Patent GB-345188-A (GB)
Title: Improvement in brake system for automotive vehicles
IPC: B60T13/24
Filed: 1930-04-15
Abstract: 345,188. Fluid pressure brakes. BRAGG, C. S., Palm Beach, Florida, and KLIESRATH, V. W., Port Washington, New York, both in U.S.A. April 15, 1930, No. 22465. Divided on 313,079, [Class 103 (i), Brakes &c.]. A Specification was laid open to inspection under Sect. 91 of the Acts, July 26, 1930. [Class 103 (i).] A brake system comprises fluid pressure operated brakes controlled by manually actuated valve mechanism and brakes connected mechanically to the manually actuated part, and means adapted to be initially adjusted by the operator whereby the operator may apply his physical force to the brakes connected to the manually actuated part selectively before, simultaneously with or after the operation of the brakes that are operated by fluid pressure. Fig. 1 shows front and rear brakes of a vehicle operated respectively by the cylinder and piston, 401,403 by the suction of the engine 460 under the control of a valve device such as shown in Figs. 8-12 of Specification 313,079. This valve device comprises a casing pivotally mounted at 433 and connected to a fixed point by a spring 450. Valves within the casing are connected to a pedal 480 which is adapted, after taking up lost motion, to engage one arm 491 of a bell-crank lever the other arm 490 of which is connected to the rod of the rear brakes. The tension of the spring 450 is adjustable by the screw 451 and its adjustment may be such that power is applied to all the brakes upon initial movement of the pedal, the pressure thus applied being dependent upon the movement of the pedal. When the lost-motion between the pedal and lever 491 is taken up, the operator may add his physical force to the rear brakes. The spring 450 may however be so adjusted that this lost-motion is taken up before the valve is operated so that the rear brakes are first applied by the direct effort of the operator. Or the direct effort and power may be simultaneously applied. The Specification as open to inspection under Sect. 91 (3) (a) describes an arrangement shown in Fig. 4 (Cancelled) comprising cylinders 701, 701a respectively operating the front brakes of a tractor, and trailer brakes, a third cylinder, not shown, provided on the same or another trailer being connected to the pipe 714b. The cylinders are respectively controlled by valves 706, 706a, 706b. The casing of the valve 706 is connected by a spring 750 to the pedal 780 as shown in Fig. 7 of Specification 313,079 and the valve rod 720 to the casing of the valve 706a the valve rod 720a of which is connected to the casing of the valve 706b. The valve rod 720c of the valve 706b is connected to the tractor rear brakes 770. The tension spring 750 is adjustable and it may be so adjusted that the valves are operated by initial movement of the pedal effecting application of all the brakes other than the brakes 770 to an extent dependent upon the movement of the pedal. When the lost-motion provided by a pin on the pedal working in a slot in a rod 751 connected to the valve casing 706 is taken up, the operator may apply the brakes 770 directly. In another arrangement a single valve arranged similarly to the valve 706, Fig. 4 (Cancelled), controls trailer brakes, the valve rod being connected to tractor brakes for the direct application thereof. This subject-matter does not appear in the Specification as accepted.