(19)

(11)

EP 0 513 222 A1

(12)

(43) Date of publication: 19.11.1992 Bulletin 1992/47 (21) Application number: 91904662.0 (22) Date of filing: 04.02.1991

(51) International Patent Classification (IPC):  F04D 13/ 02( . ) F04D 29/ 046( . ) F04D 29/ 70( . ) F04D 29/ 04( . ) F04D 29/ 06( . ) (86) International application number: PCT/US1991/000762 (87) International publication number: WO 1991/012412 (22.08.1991 Gazette 1991/19)

(84) Designated Contracting States: DE ES FR GB IT (30) Priority: 06.02.1990 US 19900475930 (71) Applicant: INGERSOLL-RAND COMPANY Phillipsburg, NJ 08865 (US)	(72) Inventors: BUSE, Frederic, W. Allentown, PA 18104 (US) COOPER, Paul Titusville, NJ 08560 (US) (74) Representative: Feakins, Graham Allan, et al  RAWORTH, MOSS & COOK RAWORTH HOUSE 36 Sydenham Road Croydon, Surrey CRO 2EF Croydon, Surrey CRO 2EF (GB)