Patent GB-470393-A (GB)
Title: Improvements in braking devices
IPC: B60T11/04
Filed: 1935-12-13
Abstract: 470,393. Vehicle brakes. ATHIMON, A. Dec. 13, 1935, No. 34590. Convention date, Dec. 14, 1934. [Class 103 (i)] In vehicle brake-operating mechanism wherein the reaction exerted by a brake drum upon the friction means applied thereto applies another brake and/or increases the application of the same brake, this reaction is transmitted by the vehicle axle upon which the friction means is mounted. In Fig. 1, the pedal 6 applies the front wheel brake 26 by cable 5 and cam lever 4 and the reaction of the braking torque on the axle 2 is transmitted to the cam lever 24 of the rear brake by an arm 1 secured to the axle 2, cable 7, lever 20, and lever 22 upon which the lever 20 is pivoted at 221. The lever 20 is connected by cable 21 to the pedal the operation of which is thus also assisted by the reaction of the brake 26. The movement of the axle 2 and arm 1 deflects the spring 3 as indicated. The axle may instead be arranged to oscillate relatively to the spring 3 by the interposition of elastic members between it and the spring and the nuts 31 of the straps by which the axle is attached. Or the axle may be pivoted to a member by which it is attached to the spring, its oscillation being resisted by spring plungers engaging the arm 1. When the pressure applied to the front brake exceeds the skidding pressure, the lever 22 ceases to move further; movement of the pedal beyond the point at which this pressure is applied may be arranged to cause the upper end of the lever 20 to contact with an extension 161, Fig. 9, of the lever 22, thus slackening the cable 21 and relieving the force applied to the pedal. The Specification as open to inspection under Sect. 91 comprises also the following subject-matter. In Fig. 7 (Cancelled) the anchor plate 60 of a front wheel brake is rotatable on the axle and the brake is applied by a cable 72, a lever 68 haying a fixed pivot 69 and a cable 70 looped round a fixed disc 61 and passed round a roller 71 on the cam lever. The torque on the anchor plate when the brake is applied is transmitted to the brakes or brakes to be operated thereby, by one or other of two cables 64, 64<1>, according to the direction of rotation of the wheel, attached to the anchor plate at 67, 67<1> and passing over pulleys 63, 63<1> mounted on a fixed lug 62. Cables 64, 64<1> are connected to a cable 65. The cables 72, 55 pass over pulleys 73 disposed in the axis of the steering pivot. Interference with the application of the brake either by the turning of the anchor plate or steering movement is thus prevented. In Figs. 14, 15 (Cancelled), the front wheel brake is applied by a cable 84 and sector 82 to which is attached a cable 81 connected to a lever 80 pivoted to a lug on a support 75 fixed to the stub axle. The edge of the sector 82 passes through the steering axis. A cable 78 passing round a ring 77 on the support 75 and a roller 79 on the cam lever is attached to the lever 80 and to the ring 77. The anchor plate 74 which carries the shoes and cam lever is rotatably mounted on an extension of the support 75 and applies the other brake or brakes by cables 85, 85<1> attached to a sector 86 pivoted on the support 75 and connected by a universal joint 88 to a shaft 89 carrying a pair of arms 92 connected by cables to the other brake or brakes. The bearing 90 for the shaft 89 is attached to the chassis by flexible strips to accommodate movements of the chassis. An arrangement is also shown in which the brake is applied and the torque transmitted by Bowden cables. Fig. 21, (Cancelled) shows an arrangement for two bogies of a railway vehicle. The operating lever 127<1> applies directly the brake on one wheel of each bogie by cables 127, 128, levers 129, cables 130 and cam levers 131 and the braking torque on one wheel applies the brake on the next wheel by the connections shown including upper and lower links 137, 139 operative according to the direction of rotation. The link 133 by which the brake on the first wheel applies that on the second wheel is connected by a floating lever 134 and cable 137 to the lever 127<1> so that the torque of the first brake increases the pressure on that lever. The torque of the right-hand brake of an axle may be transmitted to the lefthand brake of the next axle. An arrangement is also shown in which the torque of a brake of a tractor vehicle applies trailer brakes. In Fig. 22 (Cancelled) in which hydraulic transmission is used the front brakes are applied by a pedal operated master cylinder 143 through pipes 144 and the torque of these brakes is transmitted hydraulically to apply the rear brakes through pipes 148. For this purpose the anchor plate 114, Fig. 13 (Cancelled) of each front brake has rollers 120, 121 one or other of which, when the brake is applied actuates through lever 118 or 119 a piston in a cylinder mounted on a fixed disc 116 and connected at 123 to the pipes 148 leading to the rear brakes. The pipes 148 are also connected to a cylinder 149 the piston in which is linked at 151 to the piston of the master cylinder 143 the pressure in which is thus increased by the pressure in these pipes. In another arrangement front and rear brakes are applied by separate master cylinders the pistons of which are operated by a common pedal through an equalizing lever and the torque of the rear brakes acts through a mechanical linkage on the pedal to increase the application of all the brakes. This subjectmatter does not appear in the Specification as accepted.