Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1980-07-09
1982-01-19
Truhe, J. V.
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
043112129
ABSTRACT:
A hydraulic elevator is employed having the usual call buttons at the respective floors and selector buttons for all floors located in the elevator cab. When a button is pushed to select a floor to which the cab is to travel, up or down, as the case may be, the cab starts moving slowly in the selected direction. During initial movement a cam on the cab triggers components in an electric circuit which, by motivating hydraulic valving causes the cab initially to accelerate to a selected rate of travel after which travel proceeds at the selected rate to a slow down point. At that point another component is triggered and the valving causes the cab to decelerate for a selected interval of travel, after which the cab moves slowly to the level to which it was called.
The invention here disclosed is one of a balanced electric bridge circuit which is made constantly sensitive to the rate of travel of the cab by use of a stationary tape extending for the full height of the vertical hoist way. The tape has in it a series of perforations through which light passes from a light emitting diode to a photodetector. Fluctuations in the amount of light caused by changes in speed of travel of the elevator cab causes a constant rebalancing of the resistance conditions in one side or the other of an electric bridge circuit whereby to constantly return the travel of the cab to the selected rate, the deviations being so quickly compensated for as to be unnoticed by the occupants of the cab.
REFERENCES:
patent: 3119501 (1964-01-01), Lemelson
patent: 3187844 (1965-06-01), MacNair et al.
patent: 3553560 (1971-01-01), Lemen
patent: 3963098 (1976-06-01), Lewis et al.
patent: 3977497 (1976-08-01), McMurray
patent: 4034275 (1977-07-01), Mangel
patent: 4276506 (1981-06-01), Little
Beehler Vernon D.
Duncanson Jr. W. E.
Elevator Equipment Co.
Truhe J. V.
LandOfFree
Valve control system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Valve control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Valve control system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1911408