| 摘要 |
<p>A lock of the type in which a latch means is able to be actuated if elongated members are able to pass through associated slots ( 54 ) in latch elements. There are two sets of latch elements ( 50 ) in two keyways ( 48, 49 ) such that, when the slots ( 54 ) in opposed pairs of elements are aligned, the actuating members can pass through. One set of latch elements ( 54 ) are positioned by a setter or biscuit ( 56 ) and the other set are positioned by a key ( 58 ) that corresponds to the shape of the setter to align the slots ( 54 ) of corresponding elements in each set. This type of lock is improved by providing at least one latch element ( 50 ) in one set (ie in one keyway 48 or 49 ), with a wider slot ( 54 ) to enable master keying. The master key is set to correspond to the highest or lowest position in the wide slot.</p> |
