Device for preventing uncontrolled acceleration of an...

B - Operations – Transporting – 66 – B

Patent

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Details

B66B 5/04 (2006.01)

Patent

CA 2362325

The invention relates to a device for preventing uncontrolled acceleration of an elevator car (1) installed in an elevator installation. The inventive device comprises a limiting cable (18) which is guided over rollers (19, 20) in a direction of movement of the elevator car (1). A braking device (6) joined to the elevator car (1) is connected to the limiting cable (18) via a release (7) and brakes the elevator car (1) in both a downward and upward direction when the limiting cable (18) transmits a predetermined release force to the release (7). A speed limiter (27) is connected to one of the rollers (19) and stops the roller (19) when the traveling speed of the elevator car (1) exceeds a predetermined limiting speed either in a downward or upward direction. According to the invention, the release (7) of the braking device (6) is connected via a slide connection (30) to the limiting cable (18) for limiting the force transmitted to the release (7) so that the limiting cable (18) slides through on said slide connection (30) when a force which is significantly larger than the release force required for releasing the braking device (6) is transmitted from the limiting cable (18) to the release (7) of the braking device (6).

Dispositif destiné à empêcher l'accélération non contrôlée de la cabine (1) d'un ascenseur, qui possède un câble de limitation (18) guidé sur des poulies (19, 20) dans le sens de déplacement de la cabine (1). Un dispositif de freinage (6), qui est connecté à la cabine (1) et relié au câble de limitation (18) par l'intermédiaire d'un déclencheur (7), freine la cabine (1) tant dans le sens ascendant que dans le sens descendant, lorsque le câble de limitation (18) transmet une force de déclenchement prédéterminée au déclencheur (7). Un limiteur de vitesse (27) est connecté à l'une des poulies et immobilise la poulie (19) lorsque la vitesse de déplacement de la cabine (1) tant dans le sens descendant que dans le sens ascendant dépasse une vitesse limite prédéterminée. Selon la présente invention, le déclencheur (7) du dispositif de freinage (6) est connecté au câble de limitation (18) destiné à limiter la force transmise au déclencheur (7) par l'intermédiaire d'une liaison par glissement (30), si bien que le câble de limitation (18) glisse sur la liaison par glissement (30) lorsqu'une force qui est considérablement plus élevée que la force nécessaire au déclenchement du dispositif de freinage est transmise du câble de limitation (18) au déclencheur (7) du dispositif de freinage (6).

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