Motor vehicles – Surface effect vehicles – Dynamic seal or fluid curtain
Patent
1990-12-06
1991-06-11
Hill, Mitchell J.
Motor vehicles
Surface effect vehicles
Dynamic seal or fluid curtain
60405, B62D 506
Patent
active
050224816
ABSTRACT:
An emergency power steering backup apparatus is adapted for supplying a vehicle's power steering unit with an emergency supply of power steering fluid only when the vehicle's primary power steering pump fails to provide fluid under sufficient pressure while the vehicle is traveling above a minimum activating speed. A pressure sensor and pressure operated switch along with a vehicle speed sensor and vehicle speed operated switch preferably provide an activating signal for activating the emergency fluid supply. The pump pressure and the vehicle speed sensors and their respective switches operate to ensure that the emergency fluid supply is activated only in an emergency situation. As an alternative, or in addition to the pump pressure and vehicle speed sensors and their respective switches, a pump drive linkage sensor may be included in the apparatus for providing a signal for activating the emergency fluid supply upon failure of the pump drive linkage. The method of the invention includes charging an emergency power steering fluid supply, preferably manually, and then activating the emergency fluid supply for powering the vehicle's power steering unit only when the power steering pump pressure fails below a minimum level while the vehicle is traveling at a speed above a minimum activating speed.
REFERENCES:
patent: 3434282 (1969-03-01), Shelhart
patent: 3762492 (1973-10-01), Ron
patent: 4114720 (1978-09-01), Ericson et al.
patent: 4190130 (1980-02-01), Beck
patent: 4204584 (1980-05-01), de Maight
patent: 4476677 (1984-10-01), Hanshaw
patent: 4574904 (1986-03-01), Goode
Culbertson Russell D.
Hill Mitchell J.
Shaffer, Jr. J. Nevin
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