Patent GB-453772-A (GB)
Title: Method and device for braking motor vehicles
IPC: F01L13/00
Filed: 1935-03-13
Abstract: 453,772. Controlling motor vehicles; brake systems. OETIKER, E., (trading as OETIKER & CO. MOTORWAGENFABRIK), 40, Anemonenstrasse, Albisrieden, Zurich, Switzerland. March 13, 1935, No. 7846. Convention date, March 14, 1934. [Class 79 (v)] [See also Groups XXVII, XXIX, and XXXIV] Comprises a braking system in which the engine is used as a brake by cutting off the fuel supply and closing a valve in the exhaust pipe, the engine brake being so combined with ordinary vehicle brakes that the engine brake comes into action first and remains in action during the actuation of the vehicle brakes. In the construction shown, the brake pedal C, Figs. 1 and 2, when depressed first closes a valve 120, Fig. 3, between the carburetter V and the induction pipe L, opens an air valve 58, and closes a valve in a valvebox 1 on the exhaust pipe A. The air thus compressed in the engine cylinders passes from the valve-box 1 through a pipe 71, filter 72, pipe 73, non-return valve 74, valve-box 75, and pipe 105, to a reservoir 106. Further depression of the brake pedal, through a link 115, opens a valve in the valve-box 75 and allows air to pass to brake cylinders 99, 100 applying ordinary vehicle brakes. If the clutch pedal is depressed to disengage the clutch while the brake pedal is depressed the engine is restored to ordinary working conditions, the clutch pedal for this purpose being connected by a link 66 to a valve 68 which closes the air intake to the air valve 58, and by links 61, 116 to valves in the boxes 1, 75 which respectively open a byepass for the exhaust in the exhaust pipe A, and close the opening of the pipe 73 into the box 75. The brake pedal C acts on the exhaust-closing valve in the box 1 through linkage B and an arm 38 working in an L-slot 41, 42. The movement of the arm in the first leg 41 of the slot closes a main slide valve 20, Fig. 8, whilst leaving open a byepass valve 28, Fig. 9, and movement in the second leg 42 of the slot leaves the main valve closed but also closes the byepass valve. Thus the main valve is easily moved since the byepass is always open during movement of the main valve. The two valves are operated by perpendicular circumferential grooves 33, 34 formed in a ball 31 fixed to the arm 38. The main valve 20 is controlled by an arm 18 having on its pivot boss 15 a lug 35 engaging the ball groove 33. Similarly the byepass valve is controlled by an arm 26 having a lug 23 engaging the ball groove 34. Thus, when the ball 31 is rotated about one axis it rotates one valve arm, and when rotated about a perpendicular axis it rotates the other valve arm. When the valve 28 is in the position shown in Figs. 9 and 10 the byepass 29 is open but the valve closes the end of the pipe 71 leading from the exhaust-box 1 to the valve-box 75 and the air reservoir, so that as the valve closes the bye-pass it opens the pipe 71 to the compressed gases. When the clutch pedal is depressed it actuates through the link 61 and arms 62, 44 a slide valve 45 which then exposes an opening 46 of a byepass 48 leading into the exhaust pipe A. The valve box 75, Figs. 12 and 13, contains slide valves 82, 88 and 90. The valve 82 is operated simultaneously with the valve 45 by depression of the clutch pedal through links 61, 116, arm 107 and shaft 80, so as to close the opening of the pipe 73 into the valve-box. The valves 88, 90 are both operated by an arm 87 on a shaft 85 actuated by the brake pedal through link 115 and an arm 108. The valve 88 controls an opening 89 between two chambers 77, 76 of the valvebox, and the valve 90 controls three ports 91, 92, 93. In the " off " position shown the brake cylinders 99, 100 are connected to the atmosphere by pipes 98, a byepass 102 in the cores 78, port 92, an annular groove 103 in the valve 90, port 93 and passage 104. When the brake pedal is depressed, the clutch pedal being released and the valve 82 therefore open, the valve 88 is moved away from the opening 89 so that the compressed air can pass from pipe 73 to chamber 76 and to the air reservoir through a pipe 105. Further depression of the brake pedal causes valve 90 to uncover port 91 so that compressed air can pass through pipes 98 to the brake cylinders to apply the brakes. The air reservoir may be used to supply air for various purposes such as for actuating an hydraulic brake, door- or window-opening appliances, signals, or a screen-wiper.