(19)

(11)

EP 0 067 815 A1

(12)

(43) Date of publication: 29.12.1982 Bulletin 1982/52 (21) Application number: 81901579.0 (22) Date of filing: 24.12.1980

(51) International Patent Classification (IPC):  F15B 11/ 20( . ) B66F 9/ 22( . ) F15B 11/ 08( . ) B66C 13/ 20( . ) F15B 11/ 02( . ) F15B 11/ 16( . ) (86) International application number: PCT/US1980/001741 (87) International publication number: WO 1982/002230 (08.07.1982 Gazette 1982/17)

(84) Designated Contracting States: DE FR GB SE (71) Applicant: CATERPILLAR TRACTOR CO. Peoria, Illinois 61629 (US)	(72) Inventor: HALL, Lowell R. Elmwood, IL 60421 (US) (74) Representative: Wagner, Karl H.  WAGNER & GEYER Patentanwälte Gewuerzmuehlstrasse 5 Postfach 246 D-8000 München 22 D-8000 München 22 (DE)