| 摘要 |
1349862 Brake lever mechanism; wire strainers; linkwork H O SCHROTER 30 April 1971 [2 May 1970] 12470/71 Headings F2E F2G and F2K A straining lever mechanism, e.g. for brakes, comprises a pivoted operating lever 1 on which is fulcrummed a control lever 11 having attached thereto an output force transmission member 8. In the released condition of the mechanism the control lever 11 engages a fixed abutment 14 about which the lever 11 swings during the initial operating movement of the operating lever 1. The control lever 11 is so mounted that the swinging movement causes the longitudinal axis of the transmission member to move towards the pivot of the operating lever 1 so that the axis intersects or passes across the fulcrum of the control lever 11. For the remainder of the operating movement the control lever 11 is maintained in a fixed position relative to the longitudinal axis of the transmission member as by the control lever abutting the lower surface of the operating lever. In the construction shown the operating lever 1 constitutes a handbrake lever which may be held in one of a plurality of positions by a spring biased pawl and ratchet mechanism. Two output force transmission members 8 are provided (Fig. 2, not shown) each being connected to a different brake. In a modification the free end of the control lever is interposed between the fixed abutment and a cam face, the cam face urging the control lever over centre into engagement with the abutment on release of the brakes. In a further embodiment (Figs. 4, 4a, not shown) the fixed abutment comprises a pair of cam slots in which ride rollers affixed to the operating lever. The force transmission member works in thrust and the operating lever consists of a brake pedal. |
