| 摘要 |
<p>A combination lock comprises a plurality of manually rotatable rings coaxially mounted about a rotatable member, a protruding cam end of a bowed annular spring fixed in an annular groove in the member pressing outwardly against inner cylindrical surfaces of the rings. Reference marks on the rings and on a non-manually rotatable external part of the member can be set to a combination corresponding to alignment of grooves in the inner surfaces of the rings with the cam, in which case the cam engages in the grooves and locks one of the rings for rotation with the member. The other grooves each have a profile such that their ring does not lock for rotation with the member, so that rotation of these rings causes retraction of the cam from the grooves.</p> |
