(19)

(11)

EP 1 871 974 A2

(12)

(43) Date of publication: 02.01.2008 Bulletin 2008/01 (21) Application number: 06750647.7 (22) Date of filing: 18.04.2006

(51) International Patent Classification (IPC):  E21B 17/22(2006.01) (86) International application number: PCT/US2006/014656 (87) International publication number: WO 2006/113764 (26.10.2006 Gazette 2006/43)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK YU (30) Priority: 10.04.2006 US 400376 19.04.2005 US 672499 P (71) Applicant: Black & Decker Inc. Newark, Delaware 19711 (US)	(72) Inventor: PUZIO, Daniel Baltimore, Maryland 21234 (US) (74) Representative: Bell, Ian Stephen et al Black & Decker, 210 Bath Road Slough, Berkshire SL1 3YD Slough, Berkshire SL1 3YD (GB)