B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/76
B60T 17/00 (2006.01) B60T 13/563 (2006.01)
Patent
CA 1190576
ABSTRACT OF THE DISCLOSURE A tandem brake booster (10) having a housing (12) with a cavity therein divided by a first wall (24) and a second wall (28) into first, second and third chambers (20, 26 and 30). The first and second chambers (20, 26) are connected to each other through a control valve (62) and the first and third chambers (20, 30) are connected to each other by a conduit (38). The second wall (28) is connected to the first wall through lever arrangements (100 and 102). When the first chamber (20) is connected to a source of vacuum, air is evacuated from the first, second and third chambers (20, 26 and 30). In response to an input force, the control valve (62) interrupts communication of vacuum to the second chamber (26) and allows air to be communicated to the second chamber (26). With air in chamber (26) and vacuum in the first and third chambers (20 and 30) a pressure differential is created across walls (24 and 28). This pressure differential simultaneously acts on the first wall (24) and second wall (28) by moving the first and second walls (24 and 28) in opposite directions to develop first and second output forces. The second output force is transmitted through the lever arrangement and added to the first output force to produce an operational force for activating a master cylinder. (Figure 1)
397379
Bendix Corporation (the)
Macrae & Co.
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