| 摘要 |
The mechanism for raisable doors comprises the arrangement of the counter-weight (1) which is jointly fixed by means of a hanger cable (3) and a hanger chain (4), which pass respectively on a pulley (9) and a pinion (10) which are situated on a shaft (11) the latter also having a pinion (12) which may be actuated by means of a chain (13) from an acutating crank (14), and wherein, in case of rupture of one of the hanging elements (3 or 4) of the counter-weight (1), there is always one of the two hanging elements acting as a security element in order to avoid that the rockable door (2) falls unexpectedly. |
