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(11)

EP 2 547 535 A2

(12)

(88) Date of publication A3: 05.01.2012 (43) Date of publication: 23.01.2013 Bulletin 2013/04 (21) Application number: 11757078.8 (22) Date of filing: 18.03.2011

(51) International Patent Classification (IPC):  B60B 15/02(2006.01) E01C 19/26(2006.01) E02D 3/026(2006.01) (86) International application number: PCT/US2011/029040 (87) International publication number: WO 2011/116310 (22.09.2011 Gazette 2011/38)

(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 RS SE SI SK SM TR (30) Priority: 17.03.2011 US 50051 19.03.2010 US 315487 P (71) Applicant: Caterpillar, Inc. Peoria, IL 61629-9510 (US)	(72) Inventors: MCPHAIL, James D. Peoria IL 61604 (US) HINRICHSEN, Michael Hans Congerville IL 61729 (US) SCHOEPKE, Randy E. Lacon IL 61540 (US) (74) Representative: Wagner & Geyer  Partnerschaft Patent- und Rechtsanwälte Gewürzmühlstrasse 5 80538 München 80538 München (DE)