EP 0502411 A3 19930203 - HYDRAULIC SYSTEM FOR CONTROLLING A LOADDRIVEN ACTUATOR
Title (en)
HYDRAULIC SYSTEM FOR CONTROLLING A LOADDRIVEN ACTUATOR
Publication
Application
Priority
DE 4106845 A 19910304
Abstract (en)
[origin: EP0502411A2] 2.1 Hydraulic systems (10) of the said type are used, e.g. in harvesters, to lower a harvesting attachment to a level at which it is supported with a predetermined force on the ground. In order to achieve this aim, conventional hydraulic systems are provided with a multiplicity of valves which are controlled in a complicated manner. 2.2 It is proposed to use a proportional pressure-relief valve as a pilot valve (20) for a main valve (18) permitting the lowering operation, which pilot valve (20) can be preloaded by means of a magnet (66) variable in its voltage. 2.3 Hydraulic systems (10) of this type are used in the positional control of harvesting attachments on harvesters. <IMAGE>
IPC 1-7
IPC 8 full level
F15B 11/02 (2006.01)
CPC (source: EP US)
F15B 11/02 (2013.01 - EP US); F15B 2211/20538 (2013.01 - EP US); F15B 2211/212 (2013.01 - EP US); F15B 2211/30505 (2013.01 - EP US); F15B 2211/40515 (2013.01 - EP US); F15B 2211/41572 (2013.01 - EP US); F15B 2211/426 (2013.01 - EP US); F15B 2211/45 (2013.01 - EP US); F15B 2211/50518 (2013.01 - EP US); F15B 2211/50536 (2013.01 - EP US); F15B 2211/5151 (2013.01 - EP US); F15B 2211/528 (2013.01 - EP US); F15B 2211/615 (2013.01 - EP US); F15B 2211/625 (2013.01 - EP US); F15B 2211/7052 (2013.01 - EP US)
Citation (search report)
- [Y] US 4873817 A 19891017 - HARMS LOUIS C [US]
- [Y] US 4622803 A 19861118 - LECH RICHARD J [US]
- [A] US 4401009 A 19830830 - ZEUNER KENNETH W [US], et al
- [A] US 4276811 A 19810707 - ZEUNER KENNETH W, et al
- [A] US 4276810 A 19810707 - ZEUNER KENNETH W, et al
- [A] US 3597907 A 19710810 - NEAL ARCHIE E
- [A] DE 2024328 A1 19701217
- [A] DE 1937346 A1 19710204 - BOSCH GMBH ROBERT [DE]
Designated contracting state (EPC)
BE DE DK FR GB IT
DOCDB simple family (publication)
EP 0502411 A2 19920909; EP 0502411 A3 19930203; DE 4106845 A1 19920924; DE 4106845 C2 19930304; US 5355773 A 19941018
DOCDB simple family (application)
EP 92103245 A 19920226; DE 4106845 A 19910304; US 84350092 A 19920228