Global Patent Index - EP 1867879 A2

EP 1867879 A2 20071219 - Hydraulic system with automatic boom extension locking

Title (en)

Hydraulic system with automatic boom extension locking

Title (de)

Hydraulisches System mit automatischer Auslegerverriegelung

Title (fr)

Système hydraulique avec blocage automatique d'allonge de flèche

Publication

EP 1867879 A2 20071219 (EN)

Application

EP 07107740 A 20070508

Priority

IT RE20060073 A 20060614

Abstract (en)

A hydraulic system comprises: - a first fluid distribution line (A) and a second fluid distribution line (B) communicating with a stem chamber (11) of a double-acting cylinder (10) destined to move two reciprocally mobile parts; - a third fluid distribution line (O) communicating with a single-acting cylinder (20) for blocking the mobile parts; - a solenoid distributor (2) which intercepts the third line (O) and switches the third line (O) between a first position in which it pressurises the single-acting cylinder (20) and a second position in which it discharges the single-acting cylinder (20); - a first bistable selector valve (7) sending in outlet a pressure signal when a pressure difference between the first line (A) and the second line (B) exceeds a certain value; - a pressure sensor (8) communicating with the first selector valve (7) and associated to the solenoid distributor (2) such as to switch the solenoid distributor (2) into the second position when the fluid pressure coming from the outlet of the first selector valve (7) exceeds a predetermined value.

IPC 8 full level

F15B 11/20 (2006.01)

CPC (source: EP)

B66C 23/705 (2013.01); B66C 23/708 (2013.01); F15B 11/20 (2013.01); F15B 2211/7052 (2013.01); F15B 2211/7053 (2013.01); F15B 2211/78 (2013.01)

Citation (applicant)

None

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

Designated extension state (EPC)

AL BA HR MK YU

DOCDB simple family (publication)

EP 1867879 A2 20071219; EP 1867879 A3 20110504; IT RE20060073 A1 20071215; US 2007289436 A1 20071220

DOCDB simple family (application)

EP 07107740 A 20070508; IT RE20060073 A 20060614; US 75953307 A 20070607