Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes fluid supporting ram in drive-means
Patent
1993-12-09
1994-12-20
Noland, Kenneth W.
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes fluid supporting ram in drive-means
187276, 187393, 91454, B66B 100
Patent
active
053747941
ABSTRACT:
A control valve assembly for an hydraulically operated elevator includes separate control valve units for controlling upwards and downwards movements of the elevator. The up valve unit is connected to a pump output and controls connection of the pump output to the elevator cylinder via a check valve. The up valve unit includes an orifice for connecting the pump output to a reservoir, and a valve member for varying the size of the orifice to control the amount of fluid passed to the reservoir, and thus the amount of fluid supplied to the elevator cylinder. The down valve unit has an inlet for connection to the elevator cylinder, a variable orifice connected to a reservoir, and a valve member for controllably varying the size of the orifice to control the rate of descent of the elevator.
REFERENCES:
patent: 2355164 (1944-08-01), Jaseph
patent: 3187844 (1965-06-01), MacNair
patent: 3706357 (1972-12-01), Simpson
patent: 3707166 (1972-12-01), Lawrence et al.
patent: 3977497 (1976-08-01), McMurray
patent: 4000754 (1977-01-01), Risk
patent: 4011888 (1977-03-01), Whelchel et al.
patent: 4148248 (1979-04-01), Risk
patent: 4153074 (1979-05-01), Risk
patent: 4457211 (1984-07-01), Risk
patent: 4676140 (1987-06-01), Haussler
patent: 4694935 (1987-09-01), Lawrence
patent: 5014823 (1991-05-01), Huikko
patent: 5046586 (1991-09-01), Pelto-Huikko
patent: 5082091 (1992-01-01), Fargo
patent: 5289901 (1994-03-01), Fargo
Noland Kenneth W.
United States Elevator Corp.
LandOfFree
Elevator control valve assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Elevator control valve assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elevator control valve assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2387145