| 摘要 |
<p>A cylinder lock has tumblers mounted in two rows, the tumblers being arranged symmetrically in pairs, each pair having one tumbler from each row in a plane, and the tumblers in each pair being mutually offset and displaceable parallel to one another in opposite directions against biassing springs when a key is inserted, whereby protruding parts of the tumblers are withdrawn from recesses in the outer cylinder of the lock to allow the barrel to be turned. The key may be reversible, i.e. the profile on one edge may be a mirror image of that of the other edge about the longitudinal center line of the key. To shorten the length of the lock for a given number of tumblers the rows are staggered longitudinally of the lock. Each tumbler may have two key engaging edges, stepped relative to the diametral direction to engage correspondingly stepped key profiles. The invention increases the number of tumblers, and hence the number of alternative key profiles, in a given length of lock compared with conventional locks.</p> |
