Land vehicles – Wheeled – Running gear
Patent
1978-10-12
1980-06-03
Song, Robert R.
Land vehicles
Wheeled
Running gear
91390, 91445, B60G 1128
Patent
active
042058643
ABSTRACT:
In a hydraulic circuit (10) fluid is passable from a priority valve (28) through control and lockout valves (30,32) to, for example, a suspension system (27) of a work vehicle (20) or control cylinders of a steering assembly. The lockout valve (32) provides for controllably operating or locking out, for example, the operation of the suspension system (27) where desired. The control valve (30) controllably passes fluid to the suspension system (27), for example, based upon demand created by operation of the system (27). The control valve (30) also delivers a signal to the priority valve (28) for maintaining priority of fluid flow from the priority valve (28) to the suspension system (27). In the circuit (10), the signal is automatically, controllably blocked in response to locking out the operation of the suspension system (27) for preventing the priority valve (28) from maintaining priority fluid flow to the non-operative suspension system (27).
REFERENCES:
patent: 3386344 (1968-06-01), Junck
patent: 3550505 (1969-05-01), Byers, Jr.
patent: 3642019 (1972-02-01), Kramer
patent: 3865135 (1975-02-01), McWilliams
patent: 3953040 (1976-04-01), Unruh
patent: 4006667 (1977-02-01), Bianchelta
patent: 4074528 (1978-02-01), Lourigan
patent: 4076275 (1978-02-01), Hiruma
Caterpillar Tractor Co.
Heming William B.
Song Robert R.
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