Hydraulic lift device for an attaching device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 9, 2003
Grant Date -
Dec 26, 2002
app pub date -
May 21, 2002
filing date -
May 28, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic lift device for an attaching device of a tractor which has a hydraulic pressure supply device and a hydraulic tank, comprising for each of two lower steering arms, a double acting hydraulic cylinder having a cylinder housing, a piston rod, a piston with a piston-end piston area and a piston rod-end piston area, as well as a piston-end cylinder chamber and a piston rod-end cylinder chamber. The device further comprises a first switching valve, which has at least three switching positions and four ports. The first port represents a connection to the pressure supply device. The second port represents the connection to the hydraulic tank. The third port represents the connection to the piston-end cylinder chamber of the first hydraulic cylinder and the fourth port represents the connection to the piston rod-end cylinder chamber of the second hydraulic chamber. The piston rod-end cylinder chamber of the first hydraulic cylinder is connected via a line to the piston-end cylinder chamber of the second hydraulic cylinder. The piston rod-end piston area of the first hydraulic cylinder and the piston-end piston area of the second hydraulic cylinder have the same size or a predetermined size relationship to each other.
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