GB661961A - Improvements in appliances on motor vehicles for operating a hydraulic vehicle brakeand for regulating the fuel feed to the engine - Google Patents

Abstract

661,961. Controlling motor vehicles. GOSSWEILER, J. Jan. 21, 1949 [Jan. 21, 1948], No. 1720/49. Class 79(v) A single pedal is arranged to actuate a hydraulic braking system and a hydraulic throttle control so that on braking pressure being applied to the pedal the hydraulic throttle control is rendered inoperative, the arrangement comprising a cylinder with a springloaded control piston therein connected to the hydraulic braking system so that on application of braking pressure the control piston is moved against the spring, thereby to release the pressure in the hydraulic throttle control by placing same into communication with a hydraulic fluid resrvoir. The brake pedal may comprise a pivoted toe-plate, rocking of which actuates the throttle control whilst depression of the whole assembly applies the brakes. As shown in Fig. 1, the brake pedal 1 actuates the piston 4 in the normal hydraulic brake control cylinder 2. The brake pressure conduit 5 communicates with the ends of cylinder 15 and braking pressure lifts the control piston 16 against the spring 30. Brake pedal 1 carries a pivoted to piece 9 controlling the throttle. Rocking movement of toe piece 9 is arranged to displace piston 8 in the arcuate cylinder 6, the latter being connected by flexible tube 14, pipe 13 and annular space 28 surrounding the control piston 16 to pipe 19 and the servo motor 20 actuating the throttle control, which is spring-biassed to its closed position. This rocking movements of the toe-piece 9 result in corresponding throttle movements. On application of braking pressure to the pedal 1, control piston 16 is raised to interrupt the hydraulic connection between pipes 13 and 19, and to relieve pressure in the hydraulic throttle control by uncovering port 23 and so placing the annular space 28 and hence the servo motor 20 in communication with the reservoir 25 at atmospheric pressure. The annular space 28 and the hydraulic system in communication therewith is kept filled from the reservoir 25 through the one-way valve 33. The braking system is kept filled from the reservoir 25 by conduit 29 which enters the brake control cylinder 2 at such a point that its opening is obscured upon any braking movement of the piston 4. The opening 37 leading from reservoir 25 to the valve 33 is at a higher level than the opening 38 leading from the reservoir to the braking system, whereby the need for replenishment of the reservoir 25 is evidenced by inability to open the throttle before the brake system fails. The Specification as open to inspection under Sect. 91, describes a modified form in which a normal pedal is used, preliminary movement of which operates the throttle and further movement applies the brakes. The control cylinder for the modification is shown in Fig. 3 (Cancelled). This subject-matter does not appear in the Specification as accepted, Preliminary movements of the pedal which cause small pressure rises in the braking system insufficient to apply the brakes, lift piston 34 against the light compression springs 35, which displaces fluid along the pipe 19 leading to the servo motor controlling the throttle to produce corresponding throttle movements. Application of braking pressure to the pedal applies the brakes and also lifts piston 34 until stops 35 engage and lift control piston 16 to place pipe 19 into communication with reservoir 25 as before, whereby the throttle is closed.