Clamping system to block the metallic blades of centrifugal vacuum fans

(19)

(11)

EP 0 711 922 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	01.04.1998 Bulletin 1998/14

(43)	Date of publication A2:
	15.05.1996 Bulletin 1996/20

(21)	Application number: 95830413.1

(22)	Date of filing: 04.10.1995

(51)	International Patent Classification (IPC)⁶: F04D 29/28

(84)	Designated Contracting States:
	DE FR GB IT SE

(30)

Priority:

13.10.1994 IT AN940050

(71)	Applicant: F.I.M.E. - FABBRICA ITALIANA MOTORI ELETTRICI - S.r.l.
	I-60022 Castelfidardo (AN) (IT)

(72)	Inventor:
	Bacchiocchi, Alberto I-60022-Castelfidardo (AN) (IT)

(74)	Representative: Baldi, Claudio
	Piazza Ghislieri, 3 I-60035 Jesi (Ancona) I-60035 Jesi (Ancona) (IT)

(54)	Clamping system to block the metallic blades of centrifugal vacuum fans

(57) The instant invention concerns a clamping system to block the metallic blades of centrifugal vacuum fans. Said procedure consists of subjecting the teeth of the vacuum fan's radial blades to a calking process, during which several deep notches are cut into the edges of the teeth, causing them to buckle and be forcibly restrained within the related housing slots.

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