Lock and key blade

A fence member for use with a cylinder lock having a cylinder shell (19), a key plug (20) rotationally mounted in said cylinder shell to provide a shear line between said cylinder shell and said key plug, a key slot (11) extending into said key plug parallel to the rotational axis thereof for receiving a key blade (1), a plurality of locking tumblers (23a-23e) arranged in a row, each locking tumbler including an elongated body portion extending and being guided within a complementary, transverse cavity (33a-33e) in said key plug, said elongated body portion (23ab-23eb) being capable of rotational movement about a longitudinal axis (B), each said locking tumbler includes a finger (23af-23ef) having a first end affixed to one end of said elongated body portion and a second end extending outwardly therefrom and terminating in a free end (60) so as to pivot about said longitudinal axis of said elongated body portion during rotation of the latter, said finger extending into said key slot for engagement with said key blade for effecting rotational positioning of the elongated body portion of the locking tumbler, a plurality of locking pins (22a-22f) arranged in a row spaced from said plurality of locking tumblers (23a-23e), said fence member comprising:

• a fence bar (29,29',29") blockingly associated with said locking tumblers and said locking pins and shaped so that rotational positioning of said locking tumblers and engagement with a properly shaped key blade allows said fence bar to clear the shear line;
• said fence bar including a first plurality of projections (40"a,40'a, between 29"a and 29"b) extending outwardly therefrom a first predetermined distance for engagement with said plurality of locking tumblers (23a-23e) and a second plurality of projections (29a-29f) extending outwardly therefrom a second predetermined distance for engagement with said plurality of locking pins (22a-22f).