Hydraulic unit with automatic regenerative system typically for log splitting machines operated by a single-acting cylinder-piston unit

(19)

(11)

EP 1 213 486 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	07.01.2004 Bulletin 2004/02

(43)	Date of publication A2:
	12.06.2002 Bulletin 2002/24

(21)	Application number: 01204395.6

(22)	Date of filing: 16.11.2001

(51)	International Patent Classification (IPC)⁷: F15B 11/024, B27L 7/00

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

05.12.2000 IT RE20010125

(71)	Applicant: Bell S.R.L.
	42100 Reggio Emilia (IT)

(72)	Inventor:
	Magnani, Elio 42100 Reggio Emiila (IT)

(74)	Representative: Corradini, Corrado et al
	Studio Ing. C. CORRADINI & C. S.r.l. 4, Via Dante Alighieri 42100 Reggio Emilia 42100 Reggio Emilia (IT)

(54)	Hydraulic unit with automatic regenerative system typically for log splitting machines operated by a single-acting cylinder-piston unit

(57) A hydraulic operating system for a tool, typically for a log splitting machine, comprising a single acting hydraulic cylinder-piston unit (9), a motor-driven pump (1) and a hydraulic distributor (5) arranged to selectively connect the piston chamber (90) of said cylinder-piston unit (9) to the pump delivery (4) or to discharge (15), in which the piston rod chamber (91) of the cylinder-piston unit (9) is connected to the piston chamber (90) by a conduit (13) comprising a unidirectional valve (130) which prevents oil transfer towards the piston rod chamber (91), and to the oil reservoir (3) by a discharge conduit (12) closed by a preset overpressure valve (120) sensitive to the pump delivery pressure and by a separate suction conduit (14) provided with a unidirectional valve (140) which prevents oil flow towards the reservoir (3).

Search report