(57) A key-operable lock cylinder (2) comprises a rotor (4), a stator (6), a keyway (10)
extending axially into the rotor (4) and a plurality of locking pins (16, 16'). The
rotor (4) is mounted within the stator (6) for rotation about its axis and a plurality
of transverse passageways (12) extend through the rotor (4) and the stator (6) and
intersect the keyway (10). A pair of the locking pins (16, 16') are slidably mounted
in each passageway (12) and the locking pins (16, 16') of a pair are resiliently biased
so as to be in mutual abutment within the keyway (10) by a biasing means associated
with each locking pin (16, 16'), such that one locking pin (16, 16') of each pair
projects across an interface (22) between the rotor (4) and stator (6) so as to prevent
rotation of the rotor (4). In use, when a complementary key (30) is inserted in the
keyway (10), the locking pins (16, 16') are movable by the key (30) such that all
the locking pins (16, 16') become located entirely within the rotor (4), so as to
permit rotation of the rotor (4) (Fig 2).
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