(57) A lock comprises a body (2), a bolt member (10, 40) mounted for movement relative
to the body (2), a drive means (8) and a link means (10d, 14, 42). The link means
(10d, 14, 42) comprises a first member (14) slidable relative to the body (2) which
is engageable with the drive means (8) for movement thereby. A second member (10d,
42), moveable about a pivot mounting (22), is driveably connected with the bolt member
(10, 40) and the first member (10d) is coupled to the second member (14, 42) at a
position between the pivot mounting (22) and the bolt member (10, 40), such that in
use, activation of the drive means (8) causes movement of the first member (10d) which
in turn produces a relatively larger movement of the bolt member (10, 40).
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