| 摘要 |
951,830. Brake-applying means; fluid pressure brakes. GIRLING Ltd. Nov. 15, 1962 [Nov. 23, 1961; Jan. 9, 1962], Nos. 41879/61 and 754/62. Headings F2E and F2F. [Also in Division B7] Means for applying simultaneously and independently brakes for steering and retardation respectively of a vehicle such as a tractor comprises a pedal which is angularly movable about two axes at right angles to each other. The pedal is movable angularly about one axis for applying the brakes and about the other for causing a force applied to the pedal to be transmitted to the brakes on wheels on either or both sides of the vehicle. In one embodiment, Fig. 1, the pedal 10 is pivoted about a pin 11 in a fork in the outer end of a short shaft 12 which is rotatable about its own axis in a housing 18. Rotation of the pedal about pin 11 actuates through a rod 15 a master cylinder 16 from which fluid pressure flows to a valve 24. Fluid is directed by the valve into one or both of the outlets 25, 26 connected to the slave cylinders on opposite sides of the vehicle. Foot pressure applied in the centre of the pad 27 causes fluid to be directed into both outlets 25, 26 and foot pressure applied to one or other side of the pad actuates the shaft 12 so that a cranked plate 21 bolted to a flange 19 rigid with shaft 12 actuates a rocking spindle 23 of the valve 24 to permit fluid to be directed into one or other of the outlets 25, 26. A locking device which comprises a hand-operated spring-loaded pin which enters into a hole in the flange 19 may be provided for holding the shaft 12 in the position whereby fluid pressure is directed to both outlets 25, 26. In another embodiment, Figs. 3 and 4, foot pressure applied to one or other side of the pad 42 rotates the pedal 41 about the axis of a shaft 44 so that an arm 46 engages with one or other of the slots 52, 53 in members 47, 48 which are connected mechanically or hydraulically to the brakes on opposite sides of the vehicle. The arm 46 is normally in engagement with both slots 52, 53 so as to apply both sets of brakes. Pivotal movement of the pedal about the axis 43 causes the arm 46 to move one or both of the members 47, 48. In a further embodiment, Fig. 8, similar to the last embodiment an arm 61 has a balance bar 62 pivoted to the lower end thereof and normally spaced from parallel walls 66, 67. Links 64, 65 are connected mechanically or hydraulically to the brakes on opposite sides of the vehicle so that when one or other end of the bar 62 is moved into one or other of the slots 68 only the brakes on one side of the vehicle will be operated. |
