(19)

(11)

EP 0 020 385 A1

(12)

(43) Date of publication: 07.01.1981 Bulletin 1981/01 (21) Application number: 79901035.0 (22) Date of filing: 21.12.1978

(51) International Patent Classification (IPC):  B29D 30/ 52( . ) B29D 30/ 54( . ) (86) International application number: PCT/US1978/000252 (87) International publication number: WO 1980/001262 (26.06.1980 Gazette 1980/14)

(84) Designated Contracting States: CH DE FR GB SE (71) Applicant: CATERPILLAR TRACTOR CO. Peoria, Illinois 61629 (US)	(72) Inventor: GRAWEY, Charles E. Peoria, IL 61603 (US)