(19)

(11)

EP 0 620 907 A1

(12)

(43) Date of publication: 26.10.1994 Bulletin 1994/43 (21) Application number: 93903036.0 (22) Date of filing: 07.01.1993

(51) International Patent Classification (IPC):  F24F 3/ 14( . ) F24F 1/ 02( . ) F24F 3/ 153( . ) (86) International application number: PCT/US1993/000165 (87) International publication number: WO 1993/014353 (22.07.1993 Gazette 1993/18)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 08.01.1992 US 19920817940 (71) Applicant: EBCO MANUFACTURING COMPANY Columbus, OH 43213-0150 (US)	(72) Inventors: ACHTNER, Joseph Dublin, OH 43017 (US) BUSICK, Louis, M. Columbus, OH 43231 (US) CHANEY, David, B. Powell, OH 43065 (US) WHARTON, Steven, W. Westerville, OH 43081 (US) (74) Representative: Modiano, Guido, Dr.-Ing., et al  Modiano, Josif, Pisanty & Staub, Baaderstrasse 3 D-80469 München D-80469 München (DE)