Land vehicles – Body elevation or tilt – Establishing riding or trim height
Patent
1984-05-01
1986-07-01
Love, John J.
Land vehicles
Body elevation or tilt
Establishing riding or trim height
180 41, 251282, 251903, 254423, 261DIG38, 280DIG1, B60S 900
Patent
active
045975841
ABSTRACT:
A system for automatically levelling a vehicle, such as a recreational vehicle, relative to gravity includes a plurality of extensible jacks, preferably hydraulic, disposed at strategic positions on the bottom of the vehicle. A plurality of switches sense the downward tilting of the vehicle relative to gravity at the strategic positions and produce signals to operate the jacks in accordance with such tilting. The jacks are extended in a particular sequence depending upon the particular directions in which the vehicle is tilted relative to gravity. The jacks become extended only when the hydraulic pressure in a hydraulic circuit exceeds a particular value. Since the rear of the vehicle weighs considerably more than the front, the switches are constructed and are connected in a circuit to resolve any ambiguities in favor of initially operating the jacks at the rear of the vehicle. A delay is preferably provided between the operation of each jack and the operation of the next jack in the sequence so that transients in the levelling of the vehicle from the operation of each jack can be eliminated before the next jack is operated. When the vehicle has been levelled, jacks still not engaging the ground are extended until they engage the ground with a reduced force. When the hydraulic forces in the jacks are less than a particular value while the vehicle is travelling, the hydraulic fluid in the jacks is slowly bled to a reservoir so that hydraulic forces cannot accumulate in the jacks to operate the jacks.
REFERENCES:
patent: 3404899 (1968-10-01), Vogel
patent: 3669409 (1972-06-01), Eranosian
patent: 3817493 (1974-06-01), Hanser
patent: 3885813 (1975-05-01), Kern
patent: 4061309 (1977-12-01), Hanser
patent: 4067543 (1978-01-01), Orth et al.
patent: 4084830 (1978-04-01), Daniel, Jr. et al.
patent: 4165861 (1979-08-01), Hanser
HWH Corporation
Love John J.
Rice Kenneth R.
Roston Ellsworth R.
Schwartz Charles H.
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