| 摘要 |
<p>The problem to be resolved consists in making automatic the locking and unlocking of the frame in front of the opening. This enclosure comprises an opening on either side of which are arranged two support means, to at least one of which is fastened one or more flexible links 1a, 1b, 1c, 1d at an intermediate level of the opening, whereas a frame is mounted so as to be movable between two positions for the blocking and release of the opening by means of this or these flexible links. According to the invention, each flexible link is permanently fastened on the two support means, whereas the movable frame (12) carries means (17a, ..., 20a, 17b, ..., 20d) for the transverse displacement of the flexible link between the said intermediate level and one of the end levels (15, 16) of the said opening (14). The invention finds an advantageous application in batteries for the rearing of birds. <IMAGE></p> |
