| 摘要 |
718,754. Fluid-pressure brakes. BENDIX AVIATION CORPORATION. Oct. 17, 1952 [Oct. 17, 1951], No. 26129/52. Class 103(1) In a fluid-pressure servo-device of the type described in Specification 702,554, the diaphragm 58 which operates to transmit " feel '' to the operator through button 114 is of such a construction that it provides an initial low pressure reaction right from the first movement of the pedal followed by a further reaction at a higher pressure range after the brake shoe clearance has been taken up. This form of operation is provided by constructing the diaphragm with two concentric rigid portions 102 and 104 interconnected by means of a flexible member 106. When the control valve is operated to actuate the device, evacuation of air from chamber 50 and simultaneously from chamber 56 to the left of the diaphragm at first causes only the centre part 102 and flexible member 106 to move to the left due to the force of spring 118 holding the outer part 104 to the right. At a later stage the force of the spring 118 is overcome whereupon the entire reaction member moves to the left. |
