| 摘要 |
<p>A lock, to be specific, a secondary key lock, which comprises: a lock body, a plug, inner pins having secret key notches, a code distinguishing plate, and a plug pin or clutch bolt. The improvement made to this kind of lock by the present invention is that the code distinguishing plate is improved to be an axial and normally relaxed code distinguishing plate, and that a drive means for driving the code distinguishing plate and a lock unlocking control member controlled by the code distinguishing plate are provided in the lock; the code distinguishing action of the code distinguishing plate is indirectly driven by the drive means through a spring; the drive means is a turning drive means or a key insertion drive means comprising a line-bit key; the lock unlocking control member is a rigid plug pin or/and a clutch bolt. A further improvement made to such kind of lock by the present invention is that the inner pins thereof are arranged radially in a row or arranged radially in more than one row. The lock provided by the present invention that is made of a key insertion drive means in combination with a clutch bolt and locating steel balls can be used in locks that require precise locating.</p> |
