From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Patent specification for a mechanical actuating mechanism for motor-vehicle brakes.
| Identifier | ExFiles\Box 147\3\ scan0106 | |
| Date | 19th July 1937 | |
| 2 479,893 projection 23 which, when the main con- is equally distributed between the wheels, trol lever is in the off position shown, a condition which reduces the likelihood engages the floating lever 16 substanti- of skidding occurring to a minimum but ally midway of its length. In these con- where maximum retardation is required 5 ditions the preliminary movement of the the braking effort on the front wheels is 45 main control member in the brake-apply- increased above that on the rear wheels. ing direction distributes the applied pres- Having now particularly described and sure substantially equally to the brakes of ascertained the nature of our said inven- the front and rear wheels. tion and in what manner the same is to 10 If, however, the applying force is be performed, we declare that what we 50 increased above a predetermined value the claim is :— spring 21 is compressed sufficiently for the 1. Mechanical actuating mechanism, projecting part 24 of the main control for the brakes of a motor-vehicle, of the member directly to engage the floating kind specified, where the main control 15 lever and at a place the distance x of member carries a spring-pressed arm 55 which from the end where the front wheel through which the floating lever is rod 17 is connected is less than the dis- actuated at one place when the applying tance y to the other end to which the force is below a predetermined value, rear wheel rod 15 is connected through whilst for a greater applying force the 20 the one-to-one lever 13. The result is spring is stressed sufficiently to enable the 60 therefore that the pull applied to the front main control member directly to engage wheel brakes will be greater than that the floating lever at another place. applied to the rear wheel brakes. In the 2. Mechanical actuating mechanism, particular arrangement illustrated the dis- according to Claim 1, characterised in 25 tribution will in the conditions specified that the main control member is a pedal 65 be approximately 70 to 30, but obviously lever with the spring-pressed arm slidingly any desired ratio may be obtained. supported or pivotally mounted upon its It will be observed that in Figure 2 heel, stop means being provided for limit- the distance x¹ is less than the distance ing the movement of the arm relatively to 30 z², meaning that when the applying force the heel in the direction in which it is 70 exceeds the predetermined value the main spring pressed. control member 11 acts on the floating 3. Mechanical actuating mechanism, lever 16 with a greater leverage than for the brakes of a motor-vehicle, sub- before, thus giving a greater braking stantially as hereinbefore described with 35 effect in severe conditions. In Figure 1 reference to the accompanying drawing. 75 the reverse is the case. For this reason Dated this 19th day of July, 1937. the arrangement of Figure 2 is preferred WALFORD & HARDMAN BROWN, to that of Figure 1. Chartered Patent Agents, Thus, by means of the invention, for Roslyn Chambers, 47, Warwick Road, 40 ordinary relatively-light braking the load Coventry, Warwickshire. Leamington Spa: Printed for His Majesty's Stationery Office, by the Courier Press.—1938. | ||