Passenger lift movable at variable speeds

Details Passenger lift movable at variable speeds Passenger lift movable at variable speeds

1992-07-28

1994-05-03

Bucci, David A.

Material or article handling

Self-loading or unloading vehicles

Loading or unloading by other carrier or mover means, and...

91 31, 91 32, 91533, 414917, 414921, B60P 144

Patent

active

053082150

ABSTRACT:
A hydraulic drive passenger lift with distinct lifting "up and down" (loading, unloading) and "fold-unfold" (storage) motion patterns, includes a flow control structure that accommodates various hydraulic flows, somewhat unrestricted for "up-and-down" movement, and different for "fold" and "unfold" movements. The flow control structure includes multiple paths between a source and an actuator, with control for selecting the appropriate path to yield predetermined flow rates. A solenoid driven spool valve and a biased movable orifice member select the desired path. Accordingly, while the flow is substantially unrestricted during "up-and-down" movement, it is somewhat restricted for reduced speed during the "unfold" movement and is more restricted during the power-driven "fold" movement.

REFERENCES:
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patent: 3415161 (1968-12-01), Mindran
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patent: 4808056 (1989-02-01), Oshima
patent: 4821622 (1989-04-01), Burk
patent: 4917001 (1990-04-01), Yoshikawa et al.
patent: 5110252 (1992-05-01), Aoki
patent: 5142963 (1992-09-01), Piekutowski

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