(57) A locking device of the cylinder-type has an additional tumbler (21) movable in a
bore (22) extending in a direction parallel to the longitudinal central plane of the
keyway (10) and opening into a side wall (10') of the keyway. The tumbler (21) has
an enlarged head (24) in which a run-up slope (26) is provided extending lengthwise
of the keyway (10). A key (12) has a control element (pin) (18) captive in a transverse
bore (15) in the blade (11), said pin being caused to project, by engagement of one
end with an abutment in the opposite side wall (10") of the keyway (10), with its
opposite end beyond the wide side of the key, thus to operate the additional tumbler
(21). The diameter of the pin (18) is substantially less than the lengthwise dimension
of the run-up slope (26).
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