(19)

(11)

EP 0 430 981 A1

(12)

(43) Date of publication: 12.06.1991 Bulletin 1991/24 (21) Application number: 89909022.0 (22) Date of filing: 20.07.1989

(51) International Patent Classification (IPC):  B66F 3/ 35( . ) F15B 15/ 10( . ) (86) International application number: PCT/GB1989/000834 (87) International publication number: WO 1990/001120 (08.02.1990 Gazette 1990/04)

(84) Designated Contracting States: BE DE FR IT (30) Priority: 23.07.1988 GB 19880017623 (71) Applicant: HUNTING ENGINEERING LIMITED Bedfordshire MK45 2HD (GB)	(72) Inventor: COLLETT, Robert, George Flitton Bedfordshire MK45 5DY (GB) (74) Representative: Horton, Andrew Robert Grant  BOWLES HORTON Felden House Dower Mews High Street Berkhamsted Hertfordshire HP4 2BL Berkhamsted Hertfordshire HP4 2BL (GB)