| (19) |
 |
|
(11) |
EP 0 578 393 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
02.03.1994 Bulletin 1994/09 |
| (43) |
Date of publication A2: |
|
12.01.1994 Bulletin 1994/02 |
| (22) |
Date of filing: 16.06.1993 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR IT |
| (30) |
Priority: |
04.07.1992 GB 9214249
|
| (71) |
Applicant: ROVER GROUP LIMITED |
|
Canley
Coventry CV4 9DB (GB) |
|
| (72) |
Inventor: |
|
- Burton, Stephen
Coventry CV4 9FJ (GB)
|
| (74) |
Representative: Wilson, Alan Stuart |
|
Rover Group Limited,
Patent Department,
Gaydon Test Centre,
Banbury Road
Lighthorne, Warwick CV35 0BL
Lighthorne, Warwick CV35 0BL (GB) |
|
| |
|
| (54) |
A key for a remote control security device |
(57) The mechanical door or ignition key has a shaft 32 and a key head 30 with a battery
42, switch 38, coding circuit 36 and RF oscillator 40. RF coupling between the shaft
52 and the oscillator 40 causes the shaft 52 to act as an RF aerial.