Conveyors: power-driven – Conveyor or accessory therefor specialized to convey people
Patent
1990-07-24
1991-10-29
Dayoan, D. Glenn
Conveyors: power-driven
Conveyor or accessory therefor specialized to convey people
198798, 198800, B66B 2110
Patent
active
050607790
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a moving ramp intended e.g. for transportation of people, comprising plates supported by wheels, which are guided for movement at an upper level to form the loaded part of the moving ramp, and at a lower level which is substantially parallel with the upper level, to form the returning part of the moving ramp adjacent plates in each part being close to each other, wherein stationary guides are provided as upper and lower runway tracks for the wheeled plates, the plates at the edges thereof are pivotally connected to endless chains at one end of the plates said chains extending along the parts to be driven in one direction in the upper part and in the opposite direction in the lower part, the other end of the plates being free for angular adjustment in cooperation with guides at the ends of the moving ramp to lower and raise, respectively, the plates by vertical displacement thereof in a substantially horizontal position one at the time from one part to the other.
U.S. Pat. No. 3,447,666 describes a moving ramp of this kind wherein the chains move in a substantially rectangular path, turning sprockets being provided at the four corners of the rectangle, and wherein a transition portion of each chain between the upper part and the lower part being utilized to transfer the end of the plates which is connected to the chain, from the upper part to the lower part, and vice versa. For the transfer of the free end of the plates there is provided at each end of the moving ramp endless auxiliary chains which are also guided in a rectangular path over turning sprockets in the four corners of the rectangle, vertical transfer portions being provided in parallel with the transition portions to take care of the free end of the plates and transfer this end from the upper part to the lower part, and vice versa, the plates being guided for parallel movement.
In another prior art moving ramp according to U.S. Pat. No. 2,893,538 wherein no endless chains are provided and wherein the plates are guided on upper and lower guide rails in the supporting and returning part, respectively, the plates are driven by means of gear wheels engaging racks on the plates in the upper part as well as the lower part. The plates are transferred between the parts at the two ends of the moving ramp by means of synchronously driven arms engaging the plates at the two ends thereof to transfer the plates by a parallel movement between the parts.
These prior art devices necessitate a large construction height in order that means provided for the transfer of the plates from one part to the other at the ends of the endless chains and for advancing the plates in the upper and lower parts will function in a satisfactory way.
If it is necessary to have the loaded part located substantially at the level of the supporting floor structure a substantial space must be provided below the loaded part to receive the returning part and the driving machinery, which means that the floor structure must form a "ditch" providing the necessary space.
SUMMARY OF THE INVENTION
The purpose of the invention is to provide a moving ramp of the kind referred to above which allows an extremely small construction height which may be less than 150 mm so that no modification at all of the supporting floor structure is necessary and the moving ramp does not interfere with existing space below the floor structure due to the fact that the moving ramp can be disposed directly on the floor structure. By this arrangement the further advantage is achieved that the moving ramp can easily be relocated should this be necessary when the room or other premises where the moving ramp is located have to be remodeled.
The said purpose is achieved by the moving ramp of the kind referred to above having obtained the characterizing features of claim 1.
BRIEF DESCRIPTION OF THE DRAWING
Embodiments of the invention will be described in more detail below reference being made to the accompanying drawings in which
FIG. 1 is a diagrammatic side vi
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Dayoan D. Glenn
Rollomatic AB
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