Motors: expansible chamber type – Constantly applied motive fluid with controlled venting – Fluid vented through working member
Patent
1976-04-30
1977-01-18
Geoghegan, Edgar W.
Motors: expansible chamber type
Constantly applied motive fluid with controlled venting
Fluid vented through working member
91369A, 60328, 60404, 60484, F15B 1302
Patent
active
040032949
ABSTRACT:
A vehicle hydraulic power brake and steering system has a hydraulic brake booster provided with a mechanism for operating a switch to indicate loss of hydraulic power, and for operating a control valve for admitting hydraulic pressure from another source such as an accumulator. The mechanism includes an actuating bar mounted in a recess formed in the wall of the hydraulic brake booster power cylinder and lying in the power chamber of the booster. The bar extends axially for a distance substantially equal to the power stroke of the power piston. An annular valve seat has a ramped groove which actuates a ball positioned in a radially extending passage of the booster piston and engaging the actuating bar in rolling contact. So long as hydraulic power pressure is available, the ramped groove does not move the ball radially outward. When this pressure is lost, the annular valve seat will be moved axially relative to the power piston, forcing the ball radially outward and moving the actuating bar radially outward to close the warning switch and to open the accumulator control valve.
REFERENCES:
patent: 3691903 (1972-09-01), Shellhause
patent: 3802195 (1974-04-01), Lewis
General Motors Corporation
Geoghegan Edgar W.
McGraw D. D.
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