Safety system in a hydraulic apparatus for controlling a front loader of a work machine for use in load lifting and holding operations

(19)

(11)

EP 1 561 867 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	26.10.2005 Bulletin 2005/43

(43)	Date of publication A2:
	10.08.2005 Bulletin 2005/32

(21)	Application number: 05002110.4

(22)	Date of filing: 02.02.2005

(51)	International Patent Classification (IPC)⁷: E02F 9/22, E02F 3/627

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR LV MK YU

(30)

Priority:

06.02.2004 IT PR20040007

(71)	Applicant: OLEOSTAR S.P.A.
	42100 Reggio Emilia (IT)

(72)	Inventor:
	Bedogni, Giorgio 42100 Reggio Emilia (IT)

(74)	Representative: Guareschi, Antonella
	c/o Ing. Dallaglio S.r.l. Viale Mentana 92/C 43100 Parma 43100 Parma (IT)

(54)	Safety system in a hydraulic apparatus for controlling a front loader of a work machine for use in load lifting and holding operations

(57) The invention relates to the field of control equipment for hydraulic front load raising systems in work machines. Particularly, the invention provides an electrically operated shutoff valve (A1,A2) in the supply circuit for each of the hydraulic lift cylinders (5,6), which valve is actuated by an electric signal from a slide valve (DS) to protect the system during load lifting and holding operations; particularly, the electromechanical system allows the valve to be opened during lowering operations and as the working machine swings to follow the road profile (floating condition of the Front Loader).

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