EP 4382675 A1 20240612 - CONSTRUCTION MACHINE
Title (en)
CONSTRUCTION MACHINE
Title (de)
BAUMASCHINE
Title (fr)
ENGIN DE CHANTIER
Publication
Application
Priority
- JP 2022060801 A 20220331
- JP 2022046416 W 20221216
Abstract (en)
Provided is a construction machine having a front work implement to be coupled with an attachment via a quick hitch, a directional control valve that controls pressurized fluid delivered from a hydraulic pump and drives an actuator of the front work implement, and an operation lever that operates the directional control valve. The construction machine also includes a lock port to be connected to a lock-side hydraulic chamber of a lock cylinder of the quick hitch, an unlock port to be connected an unlock-side hydraulic chamber of the lock cylinder, a selector valve that switches connection destinations of the lock port and the unlock port to any one of the hydraulic pump and a reservoir, a switch that operates the selector valve, a pilot drive type relief valve disposed in a hydraulic line connecting the hydraulic pump and the selector valve, and a relief pilot line that connects, to a hydraulic chamber of the relief valve, a hydraulic line to be boosted as a result of an operation of the operation lever.
IPC 8 full level
CPC (source: EP KR)
E02D 29/0233 (2013.01 - KR); E02D 29/0266 (2013.01 - KR); E02F 3/3663 (2013.01 - EP); E02F 9/226 (2013.01 - EP); E02D 2200/16 (2013.01 - KR); E02D 2300/0071 (2013.01 - KR); E02D 2600/20 (2013.01 - KR); E02D 2600/30 (2013.01 - KR)
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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4382675 A1 20240612; CN 117916427 A 20240419; JP WO2023188593 A1 20231005; KR 20240042053 A 20240401; WO 2023188593 A1 20231005
DOCDB simple family (application)
EP 22935721 A 20221216; CN 202280061087 A 20221216; JP 2022046416 W 20221216; JP 2024511228 A 20221216; KR 20247007704 A 20221216