| 摘要 |
<p>A lock comprises inner and outer tubular members (12, 13), relative axial movement of which occurs during operation of the lock. When the key is absent, relative axial movement is prevented by magnetic elements (24, 25, 26), each of which is disposed in a respective track formed collectively by apertures in the inner and outer members. The track is closed at the inside of the inner member by a closure sleeve (33) which defines the keyway. The track is also closed at the outside of the outer member by a closure sleeve (34) which is sealed at its ends to the outer member (13). The apertures which provide a single track are formed by making a single cut through the outer member and through the inner member prior to fitting of the closure elements. </p> |
