| 摘要 |
<p>A cylinder lock comprising a non-rotatable cylinder housing and therein a key operated lock mechanism including a turnable cylinder and a plurality of movable locking discs. When the locking discs are in their zero position, that is, their normal position before the key is inserted into the lock, they keep the lock mechanism in a locked position, in which the cylinder is prevented from turning relatively to the cylinder housing. The locking discs are movable by the key to a cylinder releasing position, and the key forces the locking discs back to their zero position after operation of the lock mechanism. There are spring means arranged to urge at least some of the locking discs in a direction away from their cylinder releasing position towards their zero position. With respect to the normal function of the lock mechanism these spring means are functionally redundant. Their only function is to provide an improved security against lock picking. It is of special advantage to apply the invention to a lock, in which the movement of the locking discs is a turning movement and the locking discs are brought to their cylinder releasing position and back to their zero position by a turning movement of the key.</p> |
