| 摘要 |
1,198,535. Fire doors. WESTLAND ENGS. Ltd. 17 Feb., 1969 [5 March, 1968], No. 10569/68. Heading A5A. [Also in Divisions E2 and F2] A sliding concertina-type fire door 10 is held in the open folded back position (chaindotted lines) unless rising temperature affects a fusible link or sensor arrangement at the junction of cable 27 with bracket 30 on the door, causing an auxiliary weight 26 to drop onto latch releasing mechanism 31 thereby releasing the open door which closes automatically by means of pretensioned spring 16 initially and then weight 19 moving downwards.
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