Key for a cylinder lock and method for making same

A key and a cylinder lock therefor,

• said lock comprising a plurality of cylindrical tumbler pins;
• and
• said key comprising an elongated blade having a key surface with a first plurality of recesses therein for receiving said tumbler pins and having a key tip at one end thereof, at least one recess of said first plurality of recesses being elongated in a direction perpendicular to the central axis of its associated tumbler pin and parallel to the longitudinal direction of said blade, and comprising
• first and second substantially parallel planar side wall portions adjacent to said key surface and extending in the longitudinal direction of said blade, said first and second wall portions being parallel to the longitudinal median plane of said one recess and to the central axis of its associated tumbler pin;
• a substantially planar base portion, said planar side wall portions being spaced from said base portion;
• third and fourth substantially planar wall portions extending between said base portion and said first and second wall portions, respectively;
• and
• sloping end wall portions defining rectilinear slide surfaces for cooperation with its associated tumbler pin, said slide surfaces being aligned with the longitudinal dimension of said blade and extending outwardly from said base portion.

A key and a cylinder lock therefor,

• said lock comprising a plurality of tumbler pins with a cylindrical portion and frustoconical distal ends;
• and
• said key comprising an elongated key blade with a key surface having a first plurality of recesses therein to receive said tumbler pins;
• said first plurality of recesses being of a lateral permutation perpendicular to said key surface, being longitudinally arrayed along said key blade and having a plurality of different depths;
• one of first plurality of recesses having the greatest depth of said first plurality of recesses and a maximum width substantially equal to the diameter of its associated tumbler pin, but slightly greater than said diameter, to receive said associated pin in close fitting sliding relationship;
• said one recess comprising
• first and second substantially parallel planar side wall portions adjacent to said key surface and
• extending in the longitudinal direction of said blade, said first and second wall portions being parallel to the longitudinal median plane of said one recess and to the central axis of its associated tumbler pin and having a height in a direction perpendicular to said key surface equal to the insertion depth of said associated tumbler pin cylindrical portion;
• a substantially planar base portion, said planar side wall portions being spaced from said base portion;
• third and fourth substantially planar wall portions extending between said base portion and said first and second wall portions, respectively;
• and
• sloping conical end wall surface portions defining rectilinear slide surfaces for cooperation with its associated tumbler pin, said slide surfaces being aligned with the longitudinal dimension of said blade and extending outwardly from said base portion.

A key and a cylinder lock therefor,

• said lock comprising a plurality of cylindrical tumbler pins;
• and
• said key comprising an elongated blade having a key surface with a first plurality of recesses therein for receiving said tumbler pins and having a key tip at one end thereof;
• at least one recess of said first plurality of recesses being elongated in a direction perpendicular to the central axis of its associated tumbler pin and parallel to the longitudinal direction of said blade, and comprising
• first and second substantially parallel planar side wall portions adjacent to said key surface and extending in the longitudinal direction of said blade, said first and second wall portions being parallel to the longitudinal median plane of said one recess and to the central axis of its associated tumbler pin;
• a substantially planar base portion, said planar side wall portions being spaced from said base portion;
• third and fourth substantially planar wall portions extending between said base portion and said first and second wall portions, respectively;
• and
• sloping end wall portions defining rectilinear slide surfaces for cooperation with its associated tumbler pin, said slide surfaces being aligned with the longitudinal dimension of said blade and extending outwardly from said base portion;
• and
• said key surface having a second plurality of recesses for receiving tumbler pins forming a permutation inclined relative to said key surface;
• at least one recess of said second plurality of recesses comprising
• a planar base section,
• a planar side wall section adjacent to said key surface and inclined relative thereto in substantially the shape of an isosceles triangle, and
• a conical side wall surface section between said base section and said planar side wall section.