Truck cover assembly having flow divider/combiner hydraulic circ

Details Truck cover assembly having flow divider/combiner hydraulic circ Truck cover assembly having flow divider/combiner hydraulic circ

1996-12-03

1998-09-15

Avila, Stephen

Land vehicles: bodies and tops

Tops

Load cover

B60P 702

Patent

active

058069119

ABSTRACT:
An hydraulic circuit for operating a truck cover assembly incorporates a flow divider/combiner which puts pairs of hydraulic actuators back into synchronization. The cover assembly is operable by pairs of hydraulic actuators. A hydraulic three-position, four-way valve is provided for each pair of actuators. In a first position, the valve allows hydraulic fluid to flow to each actuator of the pair through a flow divider/combiner. The flow divider/combiner includes a cross-over pressure relief valve and a divider/combiner section. The divider/combiner section divides the flow generally equally on lines to each actuator of the pair. If the actuators get out of synchronization, an increased pressure in one line triggers the cross-over relief valve to open a line to the other actuator, thereby diverting fluid away from the actuator that has finished its stroke to the actuator that is still completing its stroke. The flow divider/combiner operates in the same manner to synchronize the actuators on the return stroke when fluid from both actuators is combined on one line.

REFERENCES:
patent: 4148517 (1979-04-01), Smith
patent: 4427231 (1984-01-01), Smith
patent: 4673208 (1987-06-01), Tsukamoto
patent: 4874196 (1989-10-01), Goldstein et al.
patent: 5238287 (1993-08-01), Haddad, Jr.
patent: 5340187 (1994-08-01), Haddad, Jr.

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