EP 2786958 A1 20141008 - Control device for the descent of a load
Title (en)
Control device for the descent of a load
Title (de)
Steuerungsvorrichtung zum Ablassen einer Ladung
Title (fr)
Dispositif de commande pour la descente d'une charge
Publication
Application
Priority
EP 13425048 A 20130405
Abstract (en)
A control device for the descent of a load, comprising: a first conduit (2), designed to connect a first chamber (C1) of a cylinder (C) with a directional control valve (D); a second conduit (3), designed to connect a second chamber (C2) of the cylinder (C) with the directional control valve (D); a control valve (4), disposed along the first conduit (2), which is designed to allow the flow of fluid from the directional control valve (D) toward the first chamber (C1) and to allow the flow of fluid from the first chamber (C1) toward the directional control valve (D) only if supplied with a pilot pressure that is greater than a minimum value; a shut-off valve (5), disposed along the second conduit (3), which is designed to take on a closed configuration, in which it prevents the flow of fluid along the second conduit (3), and an open condition, in which it enables the flow of fluid from the directional control valve (D) toward the second chamber (C2) only if the pressure present between the shut-off valve (5) and the directional control valve (D) exceeds a given minimum pressure; a pilot conduit (6), which connects the control valve (4) with the section of the second conduit (3) between the shut-off valve (5) and the directional control valve (D); a drainage conduit (7) which connects the section of the second conduit (3) between the shut-off valve (5) and the second chamber (C2) with a drain (T); a one-way valve (8), disposed along the drainage conduit, which prevents flow from the drain (T) toward the second conduit (3) and allows flow from the second conduit (3) toward the drain only if the pressure upstream of the one-way valve (8) exceeds a given minimum pressure; a choke (13), disposed in parallel with the shut-off valve (5).
IPC 8 full level
B66F 9/22 (2006.01)
CPC (source: EP)
B66F 9/22 (2013.01); E02F 9/2203 (2013.01); E02F 9/226 (2013.01); F15B 11/003 (2013.01); F15B 2211/30505 (2013.01); F15B 2211/30515 (2013.01); F15B 2211/31552 (2013.01); F15B 2211/329 (2013.01); F15B 2211/40515 (2013.01); F15B 2211/40584 (2013.01); F15B 2211/41527 (2013.01); F15B 2211/428 (2013.01); F15B 2211/473 (2013.01); F15B 2211/50518 (2013.01); F15B 2211/5153 (2013.01); F15B 2211/5159 (2013.01); F15B 2211/555 (2013.01); F15B 2211/635 (2013.01); F15B 2211/761 (2013.01); F15B 2211/8609 (2013.01)
Citation (search report)
- [XI] EP 2372167 A1 20111005 - BOSCH REXROTH OIL CONTROL S P A [IT]
- [I] US 5034892 A 19910723 - SAOTOME YOSHIMI [JP]
- [A] DE 102004005402 A1 20050818 - JUNGHEINRICH AG [DE]
- [A] EP 1574474 A2 20050914 - DEERE & CO [US]
- [A] EP 1932797 A1 20080618 - OGNIBENE SPA [IT]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DOCDB simple family (application)
EP 13425048 A 20130405