EP 2699804 A4 20150729 - SYNCHRONIZED LIFTING APPARATUS

Title (en)

SYNCHRONIZED LIFTING APPARATUS

Title (de)

SYNCHRONISIERTE HEBEVORRICHTUNG

Title (fr)

APPAREIL DE LEVAGE SYNCHRONISÉ

Publication

EP 2699804 A4 20150729 (EN)

Application

EP 12859424 A 20120410

Priority

US 201161477931 P 20110421
US 2012032836 W 20120410

Abstract (en)

[origin: WO2013095693A1] A synchronous lifting system with single-rod, single-acting hydraulic cylinders controlled by parallel-connected lift valves having two fluid passages. Hydraulic fluid for extending the actuators is delivered by a hydraulic supply system alternating between the two passages. Each time the supply circuit alternates passages, a fixed volume of hydraulic fluid is transferred by the lift valves to the cylinders causing the rods to lift a proportionate amount. All of the rods extend by approximately the same increment each time the supply circuit alternates passages. Because the rods all extend the same increment each cycle, the load is lifted evenly and the need for height sensors or transducers is eliminated.

IPC 8 full level

B66F 3/24 (2006.01); B66F 3/46 (2006.01); E01D 15/02 (2006.01); E04B 1/35 (2006.01); F15B 7/00 (2006.01); F15B 11/13 (2006.01); F15B 11/22 (2006.01)

CPC (source: EP)

B66F 3/24 (2013.01); B66F 3/46 (2013.01); F15B 11/13 (2013.01); F15B 11/22 (2013.01); E04B 1/3511 (2013.01); F15B 2211/20538 (2013.01); F15B 2211/3051 (2013.01); F15B 2211/30515 (2013.01); F15B 2211/327 (2013.01); F15B 2211/6309 (2013.01); F15B 2211/7052 (2013.01); F15B 2211/782 (2013.01)

Citation (search report)

[XI] CN 201461586 U 20100512 - JIANXIN ZHOU
[XAI] US 4241581 A 19801230 - CHACE RICHARD A [US]
[X] CN 101705951 A 20100512 - XCMG GROUP ENGINEERING MACHINE
[A] EP 0206382 A2 19861230 - CORGHI ELETTROMECC SPA [IT]
[XA] US 2004020197 A1 20040205 - CRAY DONALD L [US]
[X] US 3783620 A 19740108 - MOE J
[X] FR 2695861 A1 19940325 - SIPAD SA [FR]
See references of WO 2013095693A1

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

DOCDB simple family (publication)

WO 2013095693 A1 20130627; AU 2012355968 A1 20131031; CN 103562563 A 20140205; EP 2699804 A1 20140226; EP 2699804 A4 20150729

DOCDB simple family (application)

US 2012032836 W 20120410; AU 2012355968 A 20120410; CN 201280025408 A 20120410; EP 12859424 A 20120410