| 摘要 |
A master tubular key co-operating with a conventional lock having a tumbler consisting of a first section rotating in the lock and having a first group of tunnels through which a group of first pins being different in length are received and a second section being fixed in the lock and having a second group of tunnels corresponding to the first group of tunnels and receiving springs and a group of second pins is disclosed. The master key has a group of springs which are much stronger than those in the lock and a plurality of strips. The springs urge the strips to force the group of first pins to keep the group of second pins completely in and the group of first pins completely off the second group of tunnels, thereby allowing the first section to rotate relative to the second section.
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