Patent GB-727082-A (GB)
Title: Improvements in a combined control device for the brakes and accelerator of a motor vehicle
Inventor: DEPUTY MARSHALL PIERCE
Filed: 1953-01-06
Abstract: 727,082. Controlling vehicles. UNI-DRIVE CORPORATION. Jan. 6, 1953, No. 412/53. Class 79(5). [Also in Group XXIX] A combined control device for the brakes and accelerator of a motor vehicle having a fluid operated brake system comprises levers connecting the brake system to the heel end of a pedal plate and to one of three pistons in a cylinder block, the cylinders being inter-connected and containing liquid, levers connecting the toe end of the plate to the second of the pistons and levers connecting the third piston to the throttle of the vehicle engine, whereby depressing the toe end of the plate opens the throttle and depressing the heel end closes the throttle and applies the brakes. As shown the pedal plate 28<SP>1</SP> is pivotally connected to a rod 7 and an arm 6. The arm 6 is carried by a lever 7<SP>1</SP> pivoted in a bracket 8 and connected to the piston rod 10 of the master cylinder 11 of the hydraulic braking system. The lever 7<SP>1</SP> carries a pin 12 engaging a slot 13 in a lever 14 pivotally carried on a shaft 16 which also carries a lever 31 pivoted to the rod 7. The levers 31, 14 are connected respectively to rods 32, 19. The rods 32, 19 are connected to arms 33, 21 respectively. The arm 33 pivoted at 34 is connected by a piston rod 35 to the second piston 36 in the cylinder block 18 and the arm 21 is carried by a shaft 22 which is connected by an arm 26 and a rod 27 to the piston 28 in the second cylinder 29 in the block 18. The third cylinder 38 in the block is connected with the other cylinders by a passage 50 whose ends are formed by threaded plugs 55 having extensions 55<SP>1</SP>. Between the extensions 551 is arranged a perforated ball 53. In the third cylinder 38 is the piston 39 connected by a rod 40, an arm 41, a shaft 42, an arm 43 and a rod 44 to a' bell crank lever 46 to which is connected a rod 49 operatively connected to the engine throttle (not shown). The liquid in the cylinders 29, 37, 38 is supplied from a reservoir 51 by orifices into the cylinder 37. The arm 21 is connected to a spring 59 whose other end is connected to a cable 60 passing over pulleys 61, 63 and secured to a hand lever 66 disposed beneath the vehicle instrument panel and carrying a spring-urged pawl 67 engaging teeth on a quadrant 69 so that the tension of the spring 59 on the arm 21 can be varied. The position of the pedal plate 28<SP>1</SP> corresponds to that in which the engine idles and the brakes are not applied. Depression of the toe of the plate causes. clockwise movement of the lever 31, Fig. 1, which through the linkages 32, 33, 35 moves the piston 36 downwardly in the cylinder 37. Such piston movement causes upward movement of the piston 39, the piston 28 being maintained in its position shown in Fig. 4 by the spring 59 and the bores 54 in the ball 53 allowing gradual transference of liquid from the cylinder 37 to the cylinder 38. Such upward movement of the piston 39 causes through the linkage 40, 41, 42, 43, 44, 46 the rod 49 to open the throttle against the action of its usual spring. Depression of the heel of the plate causes through the linkage 6, 7<SP>1</SP>, 10 the master cylinder 11 to apply the brakes. Such move. ment of the lever 7<SP>1</SP> causes through the pin and slot connection 12, 13, clockwise movement of the lever 14 which causes through the linkage 19, 21, 22, 26, 27 and against the action of the spring 59 upward movement of the piston 28. Such movement of the piston 28 causes the pistons 36, 39 to move downwardly, thus closing the throttle.