Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – With means for proportioning motive fluid supply to plural...
Patent
1977-09-12
1979-02-27
Geoghegan, Edgar W.
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
With means for proportioning motive fluid supply to plural...
60547B, 60548, 60550, 60494, F15B 1120
Patent
active
041412842
ABSTRACT:
A power brake valve and a related braking system are disclosed. The valve comprises a housing defining a first bore of large diameter and a second bore of smaller diameter, and annular pistons are slidably disposed within each bore. A biended rod, also slidable within the bores, carries reaction pistons which are radially extended to cover the annular flow space of the adjacent, associated annular pistons. When the rod is pulled in a power mode of operation, each annular piston moves toward the associated annular piston to restrict and halt the normal flow of fluid through the annular piston and create a movable end wall. As pressure rises within the chambers, pressurized fluid is discharged from the valve to brake units to cause braking action. In a manual mode of operation, pulling action on the rod causes a relatively large quantity of relatively low pressure fluid to be discharged from the first chamber so as to quickly and effectively take up systemic clearances within the brake system. Further pulling action on the rod causes a relatively small quantity of relatively high pressure fluid to be ejected from the second chamber to cause effective braking action without overextended brake pedal movement.
REFERENCES:
patent: 3298177 (1967-01-01), Kellogg
patent: 3827765 (1974-08-01), Husted
patent: 3900229 (1975-08-01), Husted
Auto Specialites Manufacturing Company
Geoghegan Edgar W.
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