(19)
(11) EP 0 108 553 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.09.1984 Bulletin 1984/36

(43) Date of publication A2:
16.05.1984 Bulletin 1984/20

(21) Application number: 83306499

(22) Date of filing: 26.10.1983
(84) Designated Contracting States:
AT BE CH DE FR IT LI LU NL SE

(30) Priority: 05.11.1982 GB 8231628

(71) Applicant: Chubb & Son's Lock and Safe Company Limited
 ()

(72) Inventors:
  • Sands, Raymond Leonard
     ()
  • Willis, David Christopher
     ()

   


(54) Security bars


(57) A security bar for use in grilles or gratings, for example to protect the window openings in secure buildings against intrusion or escape. The bar has a central steel core 5 to provide bending resistance, sheathed in a layer 7 of material having enhanced resistance to sawing and filing. The layer 7 preferably comprises nuggets 8 of alumina, silicon carbide or the like very hard material bound in a matrix 9 of polymer or cement, cast into the sapce between the core 5 and an outer finishing skin 6.






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