(19)

(11)

EP 0 484 375 A1

(12)

(43) Date of publication: 13.05.1992 Bulletin 1992/20 (21) Application number: 90911000.0 (22) Date of filing: 12.07.1990

(51) International Patent Classification (IPC):  G05B 15/ 02( . ) H04Q 9/ 00( . ) G05B 19/ 042( . ) (86) International application number: PCT/US1990/003875 (87) International publication number: WO 1991/002300 (21.02.1991 Gazette 1991/05)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 28.07.1989 US 19890387019 (71) Applicant: Johnson Service Company Milwaukee Wisconsin 53209 (US)	(72) Inventors: PASCUCCI, Gregory, Adorno Waukesha, WI 53186 (US) PIERSON, John, Charles Glendale, WI 53209 (US) DUENKEL, Gerald, A. Grafton, WI 53024 (US) (74) Representative: UEXKÜLL & STOLBERG  Patentanwälte Beselerstrasse 4 D-22607 Hamburg D-22607 Hamburg (DE)