(19)

(11)

EP 0 096 037 A1

(12)

(43) Date of publication: 21.12.1983 Bulletin 1983/51 (21) Application number: 82902170.0 (22) Date of filing: 09.07.1982

(51) International Patent Classification (IPC):  E21B( . ) B25D 9/ 04( . ) E21B 4/ 14( . ) E21B 4/ 06( . ) E21B 4/ 00( . ) (86) International application number: PCT/EP1982/000147 (87) International publication number: WO 1983/000183 (20.01.1983 Gazette 1983/02)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 13.07.1981 SE 19810004328 (71) Applicant: NYMAN, Karl-Erik S-234 00 Lomma (SE)	(72) Inventor: NYMAN, Karl-Erik S-234 00 Lomma (SE) (74) Representative: Asketorp, Göran P., et al  Lars Holmqvist Patentbyra AB Box 4289 S-203 14 Malmö 4 S-203 14 Malmö 4 (SE)