Patent ID: 6739430
Filing Date: 2004-05-25
Classification: B66B

Abstract:
A ramp system for transporting material between a first site and a second site, said first site having a lower elevation than said second site, the system comprising:a) first and second rails extending between said first and second sites, said first and second rails pivotally attached at one end to said second site at first and second lower attachment points respectively, each rail bearing an upwardly extending support member near its opposite end; b) a carriage for carrying said material, said carriage having a frame comprising a front portion, a lower rear portion and an upper rear portion; c) a plurality of wheels attached to said lower rear portion of said carriage for engaging said rails; d) a first upper pulley attached to said upper rear portion of said frame on one side thereof, and a second upper pulley attached to said upper rear portion of said frame on the opposite side thereof; e) a first lower pulley attached to said lower rear portion of said frame on one side thereof, and a second lower pulley attached to said lower rear portion of said frame on the opposite side thereof; f) a first cable attached at one end to a first upper attachment point on said second site, said first upper attachment point located at a higher elevation than said first lower attachment point, said first cable attached at an opposite end to the bottom portion of said support member on said first rail, said first cable extending from said first upper attachment point over said first upper pulley and under said first lower pulley; g) a second cable attached to a second upper attachment point on said second site, said second upper attachment point located at a higher elevation than said second lower attachment point, said second cable attached at an opposite end to the bottom portion of said support member on said second rail, said second cable extending from said second upper attachment point over said second upper pulley and under said second lower pulley; and h) means for providing motive force to said carriage to move it up and down said rails between said first and second sites.