Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1985-10-21
1987-01-27
Rolla, Joseph J.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187 85, 187 17, 254 89H, 91517, 91445, B66F 716, F15B 1307
Patent
active
046388869
ABSTRACT:
An apparatus for disabling an obstructed lift mechanism having at least two hydraulic cylinders for controllably lifting and lowering a load includes a pair of valves, each arranged for sensing the differential pressure between a first sensing line and a second sensing line. The first valve is movable to a position for preventing the flow of hydraulic fluid from a first cylinder when the pressure in the second sensing line exceeds that in the first sensing line by a first predetermined value. The second value is movable to a position for preventing the flow of hydraulic fluid from the first cylinder when the pressure in the first sensing line exceeds that in the second sensing line by a second predetermined value. If the flow of hydraulic fluid from the first cylinder is prevented by the movement of either the first valve or the second valve, the operator is required to lift the load slightly to remove the obstruction.
REFERENCES:
patent: 2144892 (1939-01-01), Parker
patent: 2698517 (1955-01-01), Witt
patent: 3960286 (1976-06-01), Spooner et al.
patent: 4457401 (1984-07-01), Taylor et al.
patent: 4567727 (1986-02-01), Grams
patent: 4573663 (1986-03-01), Nussbaum
Pedersen Nils E.
Rolla Joseph J.
Shupe Larry L.
Sta-Rite Industries, Inc.
LandOfFree
Apparatus for disabling an obstructed lift mechanism does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for disabling an obstructed lift mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for disabling an obstructed lift mechanism will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-853425