(19)
(11) EP 0 429 226 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.09.1991 Bulletin 1991/37

(43) Date of publication A2:
29.05.1991 Bulletin 1991/22

(21) Application number: 90312256.2

(22) Date of filing: 09.11.1990
(51) International Patent Classification (IPC)5: E05B 21/00
(84) Designated Contracting States:
CH DE LI SE

(30) Priority: 24.11.1989 GB 8926637

(71) Applicant: CHUBB RESEARCH LIMITED
Sunbury-on-Thames Middlesex TW16 7AR (GB)

(72) Inventors:
  • Johns-Hunt, John
    Dudley, Worcestershire (GB)
  • Robinson, William Keith
    Wolverhampton, West Midlands (GB)

(74) Representative: Obee, Robert William 
Group Patents Department Racal Group Services Limited Richmond Court 309 Fleet Road
Fleet Hampshire GU13 8BU
Fleet Hampshire GU13 8BU (GB)


(56) References cited: : 
   
       


    (54) Lever locks


    (57) A lever lock includes an additional arrester member 16 to restrict the movement of a barrel-and-curtain member 11 in such a way that, in the locking condition with the bolt 3 extended, the barrel-and-curtain member cannot be turned to the extent which would enable the barrel slot 13 to face that region of the lever bellies 10 from which information on the key bit pattern might be derived by observation of the pattern of wear. The arrester member is in the form of a plate sliding in parallel with the bolt and linked to it through a lost-motion pin and slot coupling 18/19. When the bolt is being retracted by the correct key the arrester member is also freed for retraction and is driven back by abutment with the turning curtain portion 14. Subsequent return movement of the arrester member when the bolt is extended occurs through the pin and slot coupling 18/19.







    Search report