(19)

(11)

EP 2 470 421 A1

(12)

(43) Date of publication: 04.07.2012 Bulletin 2012/27 (21) Application number: 10812403.3 (22) Date of filing: 23.08.2010

(51) International Patent Classification (IPC):  B63H 25/38(2006.01) (86) International application number: PCT/SE2010/050904 (87) International publication number: WO 2011/025444 (03.03.2011 Gazette 2011/09)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 27.08.2009 SE 0950618 (71) Applicant: Rolls-Royce Aktiebolag 681 29 Kristinehamn (SE)	(72) Inventor: FORSSTRÖM, Jan-Olov S-681 35 Kristinehamn (SE) (74) Representative: Johansson, Lars E.  Hynell Patenttjänst AB P.O. Box 138 683 23 Hagfors 683 23 Hagfors (SE)