| 摘要 |
The arrangement has force transmitting devices (7, 8) of adjustable length mounted between a key and respective brake shoes; a wheel (19) is freely journalled on the key shaft (4) and at one side is in engagement with tooth racks of the force transmitting devices (7, 8) and on the other side a spring latch (20) rigidly mounted on the key shaft (4) is arranged to contact ridges and grooves on the whell as in Figure 6. During brake application, teeth (18) of the tooth racks slide in inclined grooves of the wheel (19) to cause rotary movement of the wheel relative to spring latch (20), and at excessive angular movement of key shaft (4) a port (24) of the latch (20) enters into a neighbouring groove of wheel (19) so that, upon brake release, the part (24) causes a tongue on the wheel (19) to increase the lengths of devices (7, 8). Toothed racks may be axially adjustable on the threaded elements (10, 11) of the devices (7, 8) for usage with different keys (6) (see e.g. Figures 9, 10). <IMAGE> |
