Cylinder lock and key combination

A key for use in combination with an associated lock comprises:

• a shell;
• a cylinder key plug rotatably mounted in said shell and having a row of central tumblers and a row of side tumblers disposed therein;
• a key slot extending in a longitudinal direction of the cylinder key plug for receiving said key which cooperates with said central and side tumblers in said cylinder key plug;
• and the key comprising:
• an elongated, essentially flat key blade extending in a main plane and having an upper, relatively narrow portion and a lower solid base portion projecting transversely from said main plane,
• wherein
• said upper, relatively narrow portion of said key blade is provided with coded upper recesses cooperating with said row of central tumblers, and
• said lower, transversely projecting solid base portion of said key blade is provided with coded side recesses cooperating with said row of side tumblers,
• and wherein
• the upper part of said transversely projecting, solid base portion of the key blade is formed as an upwardly projecting lip which extends in a longitudinal direction at a transversal distance from said main plane of the key blade so as to form a longitudinal groove therebetween, and wherein said lip tapers upwardly towards a free edge surface,
• said coded side recesses extend from an upper edge of said lip downwardly to different levels in a side surface part of said solid base portion of the key blade, and
• said key being insertable into a key slot of the lock wherein the key slot includes a cross-sectional profile corresponding to that of said key blade, generally in a main plane, including a relatively narrow upper portion, a widened, lower portion, and a downwardly projecting tongue at the transition between said upper and lower portions, said tongue fitting into said longitudinal groove of the key blade.

A cylinder lock and key combination, said cylinder lock comprising:

• a shell;
• a cylinder key plug rotatably mounted in said shell and having a row of central tumblers and a row of side tumblers disposed therein, said side tumblers being non-rotatably guided in the cylinder key plug and comprise projections projecting transversely from a circular-cylindrical mantle surface and said projections extend along the entire axial length of the associated side tumbler;
• a key slot extending in a longitudinal direction of the cylinder key plug for receiving said key which cooperates with said central and side tumblers in said cylinder key plug;
• said key comprising:
• an elongated, essentially flat key blade extending in a main plane and having an upper, relatively narrow portion and a lower solid base portion projecting transversely from said main plane,
• wherein
• said upper, relatively narrow portion of said key blade is provided with coded upper recesses cooperating with said row of central tumblers, and
• said lower, transversely projecting solid base portion of said key blade is provided with coded side recesses cooperating with said row of side tumblers,
• and wherein
• the upper part of said transversely projecting, solid base portion of the key blade is formed as an upwardly projecting lip which extends in a longitudinal direction at a transversal distance from said main plane of the key blade so as to form a longitudinal groove therebetween,
• said coded side recesses extend from an upper edge of said lip downwardly to different levels in a side surface part of said solid base portion of the key blade, and
• said key slot of the lock has a cross-sectional profile corresponding to that of said key blade, generally in a main plane, including a relatively narrow upper portion, a widened, lower portion, and a downwardly projecting tongue at the transition between said upper and lower portions, said tongue fitting into said longitudinal groove of the key blade.