Lock and key with double code pattern

A key (100) for operating a cylinder lock having a key plug with a key slot and at least two side locking tumblers, said key comprising:

• a substantially flat key blade (102) having, in a side recess, a code pattern (110) for engagement with transverse fingers projecting transversely from the side locking tumbler and positioning said side locking tumblers into positions that allow said key plug to rotate in said cylinder lock upon insertion of the key blade into the key slot, comprising:
• said code pattern in the side recess of the key blade comprises at least two separate code surfaces being formed on at least one side of the key blade and extending along at least a part of the length of the key blade for engagement with the transverse fingers projecting transversely from the side locking tumbler and being rotatable, comprising, on the same side (101) of the key blade:
• a primary code surface (131-135;
• 141′;
• 151) with first code surface portions specifically distributed longitudinally on at least one side wall in an external portion of said side recess and adjoining said one side surface of the key blade, and
• at least one secondary code surface (141-145;
• 142′;
• 152) with second code surface portions specifically distributed longitudinally in an internal, deeper portion of said side recess,
• said first and second code surface portions being located in well-defined positions which are generally variable or separated in three dimensions in a respective tumbler contacting region of said key blade, namely:
• in a direction upwards and downwards in a vertical plane defining said flat key blade,
• in a depth direction which is perpendicular to said vertical plane, and
• in a longitudinal direction along said key blade, such that a compact code pattern with an increased number of code combinations is formed on the key blade.

A lock and key combination including

• a cylinder lock with a rotatable key plug having a key slot for receiving a flat key blade, and
• a key (100) with said flat key blade, and
• at least two side locking tumblers (201a, 201b;
• 301, 302;
• 401, 402) in said cylinder lock, said side locking tumblers being guided for at least one of elevational and rotational movement in associated chambers in said key plug and having transverse fingers (211a, 211b;
• 311, 312;
• 411, 412a, 412b) projecting into said key slot for engagement with said key blade, upon inserting said key into said key slot, and
• an associated code pattern (110) in a side recess (115, 118) of said key blade for engagement with said side locking tumblers and positioning said side locking tumblers into positions that allow said key plug to rotate in said cylinder lock upon inserting a correctly coded key into the key slot,
• wherein said associated code pattern in the side recess of the key blade comprises at least two separate code surfaces (111, 112;
• 141, 142;
• 151, 152) formed on at least one side of the key blade and extending along at least a part of the length of the key blade, wherein at least one of the two separate code surfaces is wave-like, comprising, on the same side surface (101) of the key blade:
• a primary code surface (131-135;
• 141′;
• 151) located on at least one side wall or shelf surface in an external portion of said side recess and adjoining said one side surface, and
• at least one secondary code surface (141-145;
• 142′;
• 152) being defined in an internal groove forming a deeper portion of said side recess, and that
• said side locking tumblers of said cylinder lock comprise:
• at least one first side locking tumbler (201b;
• 301;
• 401) having a transverse first finger (211b, 311, 411) configured to engage with said primary code surface on said side wall or shelf surface in said side recess, and
• at least one second side locking tumbler (201a;
• 302;
• 402a), located on the same side of the key slot as said first side locking tumbler and having a transverse second finger (211a, 312, 412a) extending into the internal deeper portion of said side recess and being configured to engage with said secondary code surface,
• wherein said primary code surface is formed by an external groove forming said external portion (111;
• 141′, 151) of said side recess, said external groove comprising two opposite side walls adjoining said one side surface of the flat key blade and said internal groove (152) is undercut and wider than said external portion (151) of said side recess.