Patent GB-408792-A (GB)
Title: Improvements in or relating to means for jointly operating vehicle brakes and carburettor throttle valves
Filed: 1933-03-13
Abstract: 408,792. Controlling motor vehicles. ABRAMSON, A., 24, Lucemburska, and NOVAK, P., 8, Ricanska, both in Prague. March 13, 1933, Nos. 7647 and 7648. Convention dates, Sept. 20, 1932, and Jan. 21, 1933. [Class 79 (v).] The brake pedal controls the throttle by means of a shaft which is operatively connected to the pedal during the entire range of movement of the pedal and is connected to the throttle linkage by disengageable coupling means. In the construction shown in Figs. 9, 12 and 13, the brake pedal 15 closes the throttle 1 when moved from I to II and applies the brakes when moved from II to III. The throttle is acted upon by a closing spring 19 and is connected by a link 2 to a shaft 3 having a spring arm 5 which is flexible laterally. The arm 5 bears against a cam 6 fixed on a shaft 7 which carries an arm 9 slidably keyed thereon and connected by a link 13 to a lever 14 having a roller 33 pressed by a spring 21 against the brake pedal. Fig. 12 shows the mechanism when the brake pedal is in position II, the throttle being shut. When the pedal is released, the spring 21 keeps the roller 33 against the pedal, the shaft 7 rotates counter-clockwise and the cam 6 presses back the arm 5 and opens the throttle. If the brake pedal is depressed beyond position 11 to apply the brakes gently the throttle is closed and is not affected by movement beyond 11 so that it does not start opening again until after the brakes are released. Means are however provided whereby, if the brakes have been fully applied, the throttle starts to open before the brakes are completely released, so that starting on a hill is possible without the use of the hand-brake. To effect this a disc 24 on the shaft 7 carries a pivoted pawl 25 pressed outwards by a spring ; this pawl carries a pin 27 adapted to co-operate with a fixed guide 28. A bell-crank lever has one arm 31 pressed by a spring 32 against the disc 24 and pawl 25 and the other arm 30 is adapted to engage and operate an arm 29 on the shaft 3. When the pedal is depressed from 11 the pin 27 rides under the guide 28, the arm 31 rests directly on the disc 24 and the throttle remains shut. If the pedal is released before position 111 the pin 27 rides back under 28 and the pawl does not affect the throttle. When the pedal, however, is fully depressed the pin 27 passes beyond the guide 28 and the pawl is projected by its spring, so that when the pedal is next released the pin 27 travels back on the outer side of the guide and prevents the pawl from being forced into the disc 24. On this return movement therefore the arm 31 is raised by the pawl and the arm 30 rotates the shaft 3 to open the throttle before the position 11 is reached in which the brakes are released. In order to allow the throttle to be closed when the car is unoccupied or for starting the engine, the shaft 7 can be moved axially, against a spring 10, by means of a lever 22 operated in any convenient manner. When this is done the cam 6 is moved out of the path of the arm 5 so that the throttle is closed by its spring 19. When the lever 22 is released the shaft 7 is pushed back by its spring 10 and the arm 5 is bent by the cam 6, so that when the pedal 15 is depressed the arm 5 can spring back over the cam 6 as soon as the position II shown in Fig. 12 is reached. In the construction shown in Figs. 2 and 3 the throttle is opened as the pedal moves from I to II, Fig. 9, and is then suddenly closed. Fig. 2 corresponds to position I of the brake pedal, so that as the pedal is depressed the cam 6 raises the spring arm 5 and opens the throttle. A cam 11 on the shaft 7 bears against a fixed pin 12 so that the shaft moves axially as it rotates, and the cam 6 slides sidewise under the arm 5. The parts are so arranged that when the arm 5 has been raised to the maximum the cam 6 moves from underneath the arm which is thus released and rides on the hub of the cam during further movement of the brake pedal. When the pedal is next released the shaft 7 is pushed back by a spring 10 and the spring arm 5 is bent aside by the cam 6, but an auxiliary cam 16 on the shaft 7 raises the arm 5 until it can slip back on to the cam 6 again, thus temporarily opening the throttle before the pedal is fully released. In order to warn the driver when the pedal is in position II in which the throttle is closed and the brakes are released a contact 17 on the arm 5 makes contact with a fixed contact 18 of a signal lamp.