Hoist driven by the transfer gearbox of a vehicle

B - Operations – Transporting – 66 – D

Patent

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Details

B66D 1/00 (2006.01) B60K 25/00 (2006.01) B66D 1/14 (2006.01) B66D 1/16 (2006.01) B66D 1/22 (2006.01) B66D 3/00 (2006.01) B66D 5/24 (2006.01)

Patent

CA 2271829

The present invention relates to traction and traction-loading hoists which are mounted on vehicles for improving their progression capability, for helping other vehicles which are blocked, for dragging loads onto the platforms of vehicles as well as for lifting or lowering loads. The hoist of the present invention comprises the following members mounted on two supports: a winding drum; a winding drum switching mechanism that disconnects said drum for unwinding more rapidly the hoist cable; a reduction gear which is in the shape of one conical and one planetary gears connected by a linking shaft and has a lower reduction ratio than that of the current ones; and a mechanism for stopping the winding drum which is made in the shape of a dented free-wheel clutch. In order to lower a load which has been previously lifted, the hoist comprises a brake system usually connected to an electro-accumulator. In order to increase the braking action, the hoist may also include a braking chamber having its control connected to the clutch control of the vehicle. The potential yield of this hoist is higher than that of similar devices.

L'invention se rapporte aux treuils de traction ou de traction/de chargement installés sur des véhicules et servant à améliorer leurs performances tout-terrain de ces derniers. Ces treuils permettent également d'aider d'autres véhicules bloqués, de tirer des charges sur le plateau du véhicule, et de lever et de faire descendre des charges. Le treuil comporte les éléments suivants montés sur deux supports: un tambour d'enroulement; un mécanisme de découplage du tambour d'enroulement permettant de désacoupler ledit tambour afin d'accélérer le déroulement du câble de treuil; un réducteur composé d'engrenages conique et planétaire reliés par un arbre, lequel possède un rapport de démultiplication inférieur à celui des réducteurs traditionnels; et un mécanisme d'arrêt du tambour d'enroulement, constitué par un embrayage à roue libre dentée. Afin de faire descendre une charge déjà levée, le treuil est muni d'un frein normalement enclenché à un accumulateur électrique. Afin d'accroître l'action de freinage, le treuil est équipé d'une chambre de freinage dont la commande est solidaire de celle de l'embrayage du véhicule. Le rendement potientiel de ce dispositif est supérieure à celle de dispositifs analogues.

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