(19)

(11)

EP 0 230 461 A1

(12)

(43) Date of publication: 05.08.1987 Bulletin 1987/32 (21) Application number: 86904724.0 (22) Date of filing: 30.07.1986

(51) International Patent Classification (IPC):  B25B 13/ 46( . ) B25B 21/ 00( . ) (86) International application number: PCT/US1986/001563 (87) International publication number: WO 1987/000786 (12.02.1987 Gazette 1987/04)

(84) Designated Contracting States: DE FR GB IT SE (30) Priority: 02.08.1985 US 19850762115 23.05.1986 US 19860866594 (71) Applicant: CIRCLE A PRODUCTS, INC. Williston, ND 58801 (US)	(72) Inventors: ANDERSON, Marvin, L. Williston, ND 58801 (US) IRVINE, Gerald, O. Crosby, MN 56441 (US) LINDENBERGER, Christopher, A. Arvada, CO 80005 (US) (74) Representative: Cross, Rupert Edward Blount, et al  BOULT, WADE & TENNANT 27 Furnival Street London EC4A 1PQ London EC4A 1PQ (GB)