Patent ID: 8210009

Claim:
The key for use in a cylinder lock with a rotatable key plug having a profiled key way, said key comprising: an elongated, substantially flat key blade ( 120 ) having a longitudinal profile groove ( 122 ) extending along at least a portion of the length of the key blade, with an inner wall ( 124 ) of said groove being substantially parallel to a side surface ( 123 ) of said flat key blade, said longitudinal profile groove ( 122 ) having, at a lower part thereof, an undercut portion ( 129 ) adjacent to and inside a ridge portion ( 128 ) of the key blade, the outside of said ridge portion forming a part of said side surface ( 123 ) of the key blade, said side surface at the lower part of said key blade lying substantially in the same plane as a side surface of the key blade at an upper part thereof, above said longitudinal groove, said longitudinal profile groove ( 122 ) defining, at an upper part thereof, a width (w) perpendicularly to said side surface ( 123 ) of said lower portion of said key blade, between an upper wall and said ridge portion ( 128 ), and the inside of said ridge portion facing said inner wall of said groove, wherein said undercut portion ( 129 ) of said longitudinal profile groove ( 122 ), at its innermost part inside said ridge portion ( 128 ), is extended, substantially in a direction in parallel to said upper and lower side surfaces ( 123 ) of the key blade ( 120 ), into a longitudinal, substantially uniformly wide pocket ( 135 ) having a uniform width with opposite substantially parallel lateral wall portions ( 132 , 133 ) and a lowermost transverse end wall ( 134 ), which is substantially flat or slightly curved, and which is substantially parallel to a lower edge portion ( 127 ) of the key blade and faces upwardly in a direction in a central plane (A) of the key blade towards said upper wall of said longitudinal profile groove ( 122 ) with said opposite lateral wall portions ( 132 , 133 ) of said pocket ( 135 ) being substantially parallel to said upper and lower side surfaces ( 123 ) of the flat key blade ( 120 ).