(19)

(11)

EP 1 809 854 A2

(12)

(43) Date of publication: 25.07.2007 Bulletin 2007/30 (21) Application number: 05851388.8 (22) Date of filing: 07.11.2005

(51) International Patent Classification (IPC):  E21B 17/22(2006.01) (86) International application number: PCT/US2005/040208 (87) International publication number: WO 2006/055303 (26.05.2006 Gazette 2006/21)

(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: 08.11.2004 US 625722 P 01.11.2005 US 731856 P 04.11.2005 US 266242 (71) Applicant: Black & Decker Inc. Newark, Delaware 19711 (US)	(72) Inventor: BROTTO, Daniele C. Baltimore, MD 21234 (US) (74) Representative: Bell, Ian Stephen  Black & Decker UK 210 Bath Road Slough, Berkshire SL1 3YD Slough, Berkshire SL1 3YD (GB)