| 摘要 |
The invention relates to a lock whose bolt is moved by means of a threaded rod screwing into a cutaway part, also threaded, of said bolt. The threaded rod is driven by an electric motor to which power is supplied by two wires at a permanent potential difference. When their polarities are reversed, the direction of movement of the bolt is reversed. An arrangement of limit switches and diodes enables the movement of the bolt in one direction to be limited whilst allowing it to move in the other direction. Closure of the locks may be brought about automatically by the closure of one of the doors. A single external or automatic control may control any number of locks on any number of doors. <IMAGE>
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