Device for blocking a safety brake for lift

Details Device for blocking a safety brake for lift Device for blocking a safety brake for lift

B - Operations, Transporting

66

B

B66B 5/04 (2006.01) B66B 5/18 (2006.01)

Patent

CA 2404677

In this lift equipment a lift cage (2) is on the way down, wherein a halt at the bottom storey is scheduled. If the lift cage (2) does not halt at the bottom storey according to plan, the lift cage (2) in its further travel is caught by buffers (26). In that case a safety brake (16) can be tripped due to the inertia of a speed limiter (13) and a limiter cable (19). So that the undesired tripping of the safety brake (16) can be avoided in the case of buffer travel, there is provided in the lift shaft (1) a blocking element (27) which blocks the movement of a blocking lever (25) as soon as the lift cage (2) has gone down past the bottom storey. The blocked blocking lever (25) blocks one double lever (14) and, by way of a linkage (18), the other double lever (14). Tripping of the safety brake (16) is thus precluded.

Dans cet ascenseur, une cabine (2) descend jusqu'à un arrêt, prévu au niveau inférieur. Si la cabine (2) ne s'arrête pas au niveau inférieur comme prévu, des amortisseurs (26) immobilisent la cabine (2) après qu'elle a dépassé sa course nominale. En pareil cas, un frein de sécurité (16) peut se déclencher du fait de l'inertie d'un limiteur de vitesse (13) et d'un câble de freinage (19). Pour éviter le déclenchement intempestif du frein de sécurité (16), en cas de course jusqu'aux amortisseurs, la gaine d'ascenseur (1) est pourvue d'un élément de verrouillage (27) qui empêche le déplacement d'un levier de blocage (25) dès que la cabine (2) dépasse le niveau inférieur. Étant immobilisé, le levier de blocage (25) verrouille un double levier (14) et, grâce à une timonerie (18), un autre double levier (14). Le déclenchement du frein de sécurité (16) est ainsi interdit.

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