Up leveling control system for small elevators

Details Up leveling control system for small elevators Up leveling control system for small elevators

1991-08-15

1993-08-03

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187110, B66B 104

Patent

active

052320707

ABSTRACT:
An up leveling control system for small elevators that uses an adjuster having a small orifice coordinating with an up speed metering edge of a separate spool in the form of a taper to meter the rate of flow of pilot oil from a bypass chamber to control the position of a bypass valve and thereby regulate the volume of oil flow proportionately to the elevator cylinder and to the pump reservoir.

REFERENCES:
patent: 3141386 (1964-07-01), Loughridge
patent: 3474811 (1969-10-01), Blain
patent: 3977497 (1976-08-01), McMurray
patent: 4153074 (1979-05-01), Risk
patent: 4534452 (1985-08-01), Ogasawara et al.
patent: 4637495 (1987-01-01), Blain
patent: 4800990 (1989-01-01), Blain
patent: 4825909 (1989-05-01), Martin et al.
patent: 4938119 (1990-07-01), Rita

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