Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1993-06-17
1994-04-05
Dayoan, D. Glenn
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187 847, 254 89H, B60S 1300
Patent
active
052996581
ABSTRACT:
An improved hydraulic circuit for a two-post lift having a master cylinder hydraulically connected to a slave cylinder. The master cylinder and slave cylinder are sized so fluid volume displaced at the rod end of the master cylinder is equal to the volume displaced at the piston side of the slave cylinder. The hydraulic circuit employs an automatic leveling valve assembly disposed to open when the lift reaches a fully lowered position to automatically equalize the displaced fluid volume of the master and slave cylinders so as to relevel the lift each time the lift is fully lowered. A sequence valve is positioned to pre-pressurize the slave cylinder before raising to compensate for any air in the circuit and fluid compressibility. A pilot operated check valve is designed to close and stop the descent of the lift in a level position if an obstruction is encountered under a side of the lift. Velocity sensor fuses connected to cylinder ports and actuated by a drop in pressure or rapid descent of the cylinders lock the cylinders in aligned positions in the event of a hydraulic leak.
REFERENCES:
patent: 3279562 (1966-10-01), Farrell
patent: 4763761 (1988-08-01), McKinsey et al.
patent: 5207297 (1993-05-01), Beattie et al.
Cox Joseph H.
Hierholzer Brian K.
Killeen Richard A.
Olsen Michael A.
Roloff Paul W.
Dayoan D. Glenn
Hunter Engineering Company
Noland Kenneth
LandOfFree
Automatic hydraulic lift circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic hydraulic lift circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic hydraulic lift circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-506179