Linear actuator with internal mechanical locking

(19)

(11)

EP 1 310 681 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	20.04.2005 Bulletin 2005/16

(43)	Date of publication A2:
	14.05.2003 Bulletin 2003/20

(21)	Application number: 02023599.0

(22)	Date of filing: 23.10.2002

(51)	International Patent Classification (IPC)⁷: F15B 15/26

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

(30)

Priority:

13.11.2001 IT TO20011066

(71)	Applicant: ROLFO S.p.A.
	I-12042 Bra (Cuneo) (IT)

(72)	Inventors:
	Ghirardo, Giovanni 12042 Bra (CN) (IT) Rolfo, Giorgio 12042 Bra (CN) (IT)

(74)	Representative: Garavelli, Paolo
	A.BRE.MAR. S.R.L., Via Servais 27 10146 Torino 10146 Torino (IT)

(54)	Linear actuator with internal mechanical locking

(57) A linear actuator (1) is disclosed that comprises: an elongated containing body (2) with a head (3); and a multi-start driving screw (9) that rotates around the longitudinal axis (A) of the actuator (1) and operatively cooperates with a nut screw (11); and means (15) for bidirectionally locking the driving screw (9) when it has reached its own final operating, pulling or pushing position, wherein such means (15) are equipped with holding means (16) for the screw (9) and cooperate with elastic means (18) in order to occupy an engagement position with the screw (9) for locking it, or a locking-release position of the screw (9).

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