Stairclimbing and descending hand truck

B - Operations – Transporting – 62 – B

Patent

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Details

B62B 5/02 (2006.01)

Patent

CA 2644990

A towing device comprising a power-assisted spider wheel assembly for ascending and descending stairwells is capable of avoiding unintentional back turning hazards that may result while descending shallower stairwells by applying torque alternatively in the climb-down and climb-up direction to the spider assembly responsive to the angle formed between the spider assembly and lower stair riser. This ensures that the unit will not suddenly fall to a lower tread, which results if the lower-leaning wheel is not first pinned against the lower inside riser and rolls forward instead. The torque exerting means may also lock said spider assembly in a fixed arbitrary orientation during ascent and descent to allow the spider assembly to achieve a safe orientation before stopping mid-stairwell increasing safety.

Dispositif de remorquage comprenant un ensemble roue à croisillons motorisée pour monter et descendre les cages d'escalier, permettant d'éviter les risques de rotations arrière involontaires qui peuvent se produire lors de descente de cage d'escalier peu profondes, par application d'un couple alternativement dans le sens descendant et dans le sens montant à l'ensemble à croisillons, en fonction de l'angle formé entre l'ensemble à croisillons et le montant inférieur d'escalier. Ainsi l'unité ne tombe pas soudainement sur un échelon inférieur, ce qui se produit si la roue inférieure n'est pas d'abord goupillée contre le montant interne inférieur et, au lieu de cela, roule vers l'avant. Le moyen d'application du couple peut aussi bloquer l'ensemble à croisillons dans une orientation arbitraire fixe durant la montée et la descente pour permettre à l'ensemble à croisillons d'atteindre une orientation de sécurité avant de stopper en cours de cage d'escalier, augmentant ainsi la sécurité.

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