Hydraulic elevator, comprising a pressure accumulator which acts as a counterweight and a method for controlling and regulating an elevator of this type
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 14, 2003
Grant Date -
N/A
app pub date -
Nov 28, 2001
filing date -
Aug 25, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic elevator with a pressure accumulator acting as a counterweight, includes a first pump for conveying hydraulic oil through a pump line, at least one valve unit, and a cylinder line to and from a hydraulic drive for a car, a second pump for conveying hydraulic oil by way of a solenoid valve from and to the pressure accumulator, which hydraulic oil can be supplied to and withdrawn from a tank. The two pumps are connected rigidly to each other and can be driven by an electric motor, the speed of which can be regulated. A single valve unit is installed between the first pump and the hydraulic drive, the valve unit being a relay-controllable valve and a first nonreturn valve connected in parallel to the relay-controllable valve. A control/automatic regulation unit is provided, and in order to control the speed of the car, acts on a power regulating unit for the electric motor, on the solenoid valve, and also, during descents, on the relay-controllable valve. A process for control and regulation of the operation of the elevator is provided, the elevator and its operation being such as to reduce the amount of electric energy required to drive the motor and thus to operate the hydraulic elevator.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully