| 摘要 |
<p>Latch operating means, preferably for a door, are provided in which linear movement of an operating member towards or away form the door causes rotational movement of a latch operating member by interaction of a thread on one member with a thread engaging cam on the other member, in which the thread is a groove and the cam engagement of the members is provided by a bearing, for example, a roller bearing or ball bearing captive between the groove on the one hand and a cavity on the other.</p> |
