(19)

(11)

EP 0 770 162 A1

(12)

(43) Date of publication: 02.05.1997 Bulletin 1997/18 (21) Application number: 95924426.0 (22) Date of filing: 07.07.1995

(51) International Patent Classification (IPC):  E01F 13/ 08( . ) (86) International application number: PCT/GB1995/001601 (87) International publication number: WO 1996/001924 (25.01.1996 Gazette 1996/05)

(84) Designated Contracting States: BE DE DK FR GB NL (30) Priority: 08.07.1994 GB 19940013775 (71) Applicant: Autolok Security Products Limited Erdington, Birmingham B24 0QG (GB)	(72) Inventors: CUMBERWORTH, Simon Cheshire WA4 4NA (GB) BREARLEY, David Oldham OL9 9DX (GB) (74) Representative: Wilson, Nicholas Martin, et al  WITHERS & ROGERS 4 Dyer's Buildings Holborn London EC1N 2JT London EC1N 2JT (GB)