Self-centring expanding shaft

(19)

(11)

EP 1 043 259 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	23.05.2001 Bulletin 2001/21

(43)	Date of publication A2:
	11.10.2000 Bulletin 2000/41

(21)	Application number: 99119660.1

(22)	Date of filing: 04.10.1999

(51)	International Patent Classification (IPC)⁷: B65H 75/24

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

(30)

Priority:

29.03.1999 IT MI990647

(71)	Applicant: Finsid S.r.l.
	20121 Milano (IT)

(72)	Inventor:
	Garella, Paolo 20050 Lesmo (MI) (IT)

(74)	Representative: Faggioni, Carlo Maria, Dr. Ing. et al
	Fumero Studio Consulenza Brevetti Franz-Joseph-Strasse 38 80301 Munich 80301 Munich (DE)

(54)	Self-centring expanding shaft

(57) A composite expanding shaft comprising a pneumatic expanding blocking system of a bobbin and a pneumechanic centering system is disclosed, wherein the pneumechanic system comprises at least a movable thrust element (3ai) operated by a fluid under pressure supplied into an expansion chamber (4), a first passage way (8a) being apt to connect said expansion chamber (4) to an inflation duct (11) of the pneumatic system, and comprising further an obstructing means (9a) of said first passage way (8a), jointly movable with said thrust element (3ai) of the centering system, apt to keep closed said first passage way (8a) for at least a predetermined portion of the thrust element stroke.

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