Profiled key for cylinder locks

The A key for use in a cylinder lock with a rotatable key plug having a profiled key way, said key comprising:

• an elongated, substantially flat one piece key blade (120) having a longitudinal profile groove (122) extending along at least a portion of the length of the flat one piece key blade (120), with an inner wall surface (124) of said longitudinal profile groove (122) being substantially parallel to a to an external side wall 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 flat one piece key blade (120), the outside of said ridge portion forming a part of said external side wall surface (123) of the flat one piece key blade (120),
• said external side wall surface (123) at the a lower part of said flat one piece key blade (120) lying substantially in the same plane as a side an upper sidewall surface (1123′) of the flat one piece key blade (120) at an upper part thereof, above said longitudinal profile groove (122),
• said longitudinal profile groove (122) defining, at an upper part thereof, a smallest opening width (w) as seen perpendicularly to said external side wall surface (123) of said lower portion of said flat one piece key blade (120), between an upper wall surface (160) and said ridge portion (128), and
• the inside of said ridge portion facing (128) being opposite said inner wall surface (124) of said longitudinal profile groove (122), wherein:
• said undercut portion (129) of said longitudinal profile groove extends downwardly substantially in a vertical direction (VD) in parallel to the upper side wall surface (1123′) and the external side wall surface (123) of the flat one piece key blade (120),
• said undercut portion (129) of said longitudinal profile groove (122), at its an innermost part inside said ridge portion (128), is extended further, substantially in a the same direction as said vertical direction in parallel to said upper and lower side surfaces (123) of the key blade (120), (VD) into a longitudinal, substantially bulbous wide longitudinal widened pocket (135) having a larger lateral width relative to than a narrowest part of the longitudinal undercut portion (129) of the profile groove (122), said bulbous wide widened pocket (135) being formed by opposite inner and outer lateral wall surface portions (132, 133), and said inner wall surface (124) of said longitudinal profile groove (122) adjoins, by way of a continuously downwardly extending wall surface portion (136), said inner lateral wall surface portion (132) of the pocket (135) and the inner lateral wall surface portion (132) of the pocket (135) extends continuously further downwardly to a lowermost transverse end wall surface (134), wherein the highest point of said inner lateral wall surface portion (132) is located below the lowest point of said inner wall surface (124) of said longitudinally profile groove (122), and a the lowermost transverse end wall surface (134) which is slightly curved and faces upwardly in a direction in a central plane (A) of the key blade opposite to said vertical direction (VD) towards said upper wall surface of said longitudinal profile groove (122).

The A key for use in a cylinder lock with a rotatable key plug having a profiled key way, said key comprising:

• an elongated, substantially flat one piece key blade (120) having a longitudinal profile groove (122) extending along at least a portion of the length of the flat one piece key blade (120), with an inner wall surface (124) of said groove being substantially parallel to a external side wall 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 flat one piece key blade (120), the outside of said ridge portion forming a part of said external side wall surface (123) of the flat one piece key blade (120),
• said external side wall surface (123) at the lower part of said flat one piece key blade (120) lying substantially in the same plane as a an upper side wall surface (1123′) of the flat one piece key blade (120) at an upper part thereof, above said longitudinal profile groove (122),
• said longitudinal profile groove (122) defining, at an upper part thereof, a smallest opening width (w), as seen perpendicularly to said external side wall surface (123) of said lower portion of said flat one piece key blade (120), between an upper wall surface (160) and said ridge portion (128), and
• the inside of said ridge portion facing (128) being opposite said inner wall surface (124) of said longitudinal profile groove (122), wherein:
• said undercut portion (129) of said longitudinal profile groove extends downwardly substantially in a vertical direction (VD) in parallel to the upper side wall surface (1123′) and the external side wall surface (123) of the flat one piece key blade (120),
• said undercut portion (129) of said longitudinal profile groove (122), at its an innermost part inside said ridge portion (128), is extended further, substantially in a the same direction as said vertical direction in parallel to said upper and lower side surfaces (123) of the key blade (120), (VD) into a longitudinal, substantially uniformly wide pocket (135) having being interrupted by at least one longitudinal recess (132a) formed in at least one of opposite inner and outer lateral wall surface portions (132, 133) and wherein said inner wall surface (1243) of said longitudinal profile groove (122) adjoins the inner lateral wall surface portion (1324), located opposite to said ridge portion and said inner lateral wall surface portion (1324) extends downwardly to a lowermost transverse end wall surface (134), said lowermost transverse end wall surface (134) being substantially flat or slightly curved and being substantially parallel to a lower lowermost edge portion wall surface (127) of the key blade and which faces upwardly in a direction being parallel to a central plane (A) of the key blade opposite to said vertical direction (VD) towards said upper wall surface of said longitudinal profile groove (122) with said opposite lateral wall surface portions (132, 133) of said pocket (135) being substantially parallel to said upper side wall surface (1123″) and lower the external side wall surfaces (123) of the flat one piece key blade (120).