| 摘要 |
<p>A key and lock combination is modified so that the key is provided with a movable indicator member which indicates the state of the lock on completion of the most recent locking or unlocking action performed by the key. The lock mechanism includes two magnet assemblies (207, 208) which are brought alternately into magnetic range of a key and a keyhole (204) dependent on whether the key, once inserted, is moved from the locked position to the unlocked position or from the unlocked position to the locked position. The key (figure 24) incorporates a moveable indicator member with a magnet at its distal end. As viewed in figure 19, the left hand magnet (207) when brought close to the keyhole (204) is close to the distal end of the key whereas the magnet (208) when brought close to the keyhole (204) is further up the shaft towards the handle. The magnets co-operate so that when magnet (207) is brough close to the shaft the indicator member is attracted by magnet (207) to move to the end of the shaft remote from the head of the key whereas when magnet (208) is brought close to the shaft the indicator member is pulled away from this position to lie as close as possible to the head.</p> |
