Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1985-10-09
1987-01-20
Shoop, Jr., William M.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66B 104
Patent
active
046374957
ABSTRACT:
An hydraulic elevator control system is provided including a by-pass valve connected between the supply and return of a source that normally supplies pressure fluid to the cylinder of the elevator and a setting valve that is operable by fluid supplied from the operating chamber of the by-pass valve to control the operation of the check valve, thereby to achieve a creeping speed of travel of the elevator car as it approaches a stopping point relative to the floor of a building to compensate for variation in oil temperature and/or pressure that occur through increased loading of the elevator, there is mixed with the primary flow of fluid to the setting valve a secondary flow of pressure--and viscosity--responsive fluid that flows over a long-edged restrictor device.
REFERENCES:
patent: 3141386 (1964-07-01), Loughridge
patent: 3474811 (1969-10-01), Blain
patent: 3530958 (1970-09-01), Brannon et al.
patent: 3977497 (1976-08-01), McMurray
patent: 4153074 (1979-05-01), Risk
patent: 4534452 (1985-08-01), Ogasawara et al.
Chovanes Eugene
Duncanson Jr. W. E.
Shoop Jr. William M.
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