| 摘要 |
1,131,581. Hand brakes. FORD MOTOR CO. Ltd. 17 Aug., 1966, No. 36734/66. Heading F2E. In a hand brake operating linkage an operating handle 11 is connected to a ratchet 35 (Fig. 4) through a lost-motion connection so that the operating handle can be moved back to a retracted position in which the brake is still applied, the operating handle being mounted on a slidable member 12 that slides in a sleeve 13 as the brake is applied, the sleeve being slidably mounted in a housing 21 and is adapted to slide in the housing as the brake is applied. In the brake applied position shown in Fig. 2, the handle 11 is shown in its extended position wherein the slidable member, in the form of a square-sectioned tube 12, attached to the handle 11 is slidable within a square-sectioned sleeve 13 until a stop-plate 17 welded to one side of the tube 12 abuts a collar 16 mounted on the sleeve 13. Movement of the tube 12 within the sleeve 13 is guided by a plug 18 welded in the end of the tube 12. The sleeve 13 is guided in a bush 14 which is rotatably mounted in the stationary housing 21 secured to the vehicle chassis so that the assembly of the handle 11, tube 12, sleeve 13 and bush 14 can rotate in the housing 21. Another stop collar 19 mounted on the lower part of the sleeve 13 is adapted to abut a pawl release lever 24 which surrounds and is a sliding fit on the sleeve 13, the lever 24 being held against axial movement by the housing 21. The ratchet mechanism is adapted to be released by rotation of the handle 11 which rotates the ratchet release lever 24. When the lever 24 is rotated a rod 43 (Fig. 4) actuates a brake linkage 41, 37 to release the pawl 35 from the ratchet teeth 32 formed on a fixed quadrant 31 bolted to the frame of the vehicle. In operation, when the handle 11 is pulled towards the position shown in Fig. 2 the brake rod 38 is applied and through the mechanical advantage linkwork 34, 39 the brakes are applied. The handle 11, tube 12 and sleeve 13 can now be pushed back to a released position wherein the collar 16 abuts against the housing 21. A lostmotion device oonstituted by a flexible cable 22, or by the fact that this cable 22 can slide through the plug 18, allows the handle to be pushed back without disturbing the lever 34 and the subsequent parts of the brake linkage. Instead of a mechanical brake linkage the linkage may be power-assisted. |
