TROLLEY FOR THE TRANSPORTATION OF A LOAD ON STAIRCASES

摘要

The present invention is a trolley that can safely transport a load on staircases, so as to prevent ruining or overturning the load. The trolley can easily ascend onto the first step and easily descend from the last step of a staircase. The trolley provides adjustable transport conditions during the ascent and descent on and from a staircase. The trolley can transport a load on straight staircases and on helical staircases, even with very low curvature radius. The trolley can be driven starting from both sides. The trolley can balance the load during the transportation on staircases.

主权项

1. A trolley for the transportation of a load on staircases having a main support frame, at least one main track mounted for rotation thereby projecting below said main support frame in order to define a first lower slide surface for the trolley, motor means or actuation means for said at least one main track, and at least one load bed supported by said main support frame, wherein said trolley comprising:
at least one auxiliary frame structure provided with support and slide or roll means delimiting a second slide surface on the lower part, and lifting-lowering means for said at least one auxiliary frame structure designed to move said at least one auxiliary frame structure with respect to said main support frame between an upper rest position, in which said at least one auxiliary frame structure is located with its support and slide or roll means at a higher level than that of said first slide surface and said trolley is movable by said at least one main track, and a lower work position, in which said main support frame is at a level higher than said at least one auxiliary frame structure and said trolley rests on said at least one auxiliary frame structure and is movable on said slide or roll means; said auxiliary frame structure is housable at an intermediate section of said main support frame and when placed in said upper rest position it is arranged completely within the bulk of said main support frame.