(19)

(11)

EP 0 270 533 A1

(12)

(43) Date of publication: 15.06.1988 Bulletin 1988/24 (21) Application number: 86904537.0 (22) Date of filing: 17.06.1986

(51) International Patent Classification (IPC):  B23B 31/ 12( . ) B25B 13/ 18( . ) B23B 31/ 173( . ) B25B 13/ 44( . ) (86) International application number: PCT/US1986/001319 (87) International publication number: WO 1987/007864 (30.12.1987 Gazette 1987/29)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (71) Applicant: COLVIN, David S. Farmington Hills, MI 48018 (US)	(72) Inventor: COLVIN, David S. Farmington Hills, MI 48018 (US) (74) Representative: Fisher, Bernard  Raworth, Moss & Cook 36 Sydenham Road Croydon Surrey CR0 2EF Croydon Surrey CR0 2EF (GB)