Trolley for Transporting Materials on Seamed Roofs

Abstract

A system for transporting materials that traverses seams and stepped sections of a standing-seam type roof includes two trolleys, the lower one of which has ridges on its top simulating roof seams and upon which the wheels of the upper trolley can be placed. When a step in the roof is encountered, the upper trolley can be rolled off the lower trolley onto the upper section of the roof.

1 . A roof trolley system for negotiating a roof step between a lower portion of the roof and an upper portion of the roof, in which both portions of the roof comprises metal panels interconnected by standing seams having uniform spacing, said system comprising 
 a first trolley having wheels adapted to ride on said seams, said wheels being laterally spaced from one another by said uniform spacing, said first trolley also having ridges on its upper surface simulating the roof seams, and    a second trolley having wheels adapted to engage said ridges and being laterally spaced from one another by said uniform spacing, and    means for securing the second trolley atop said first trolley,    whereby when said second trolley is placed on said first trolley, the first trolley may be moved along the seams of the lower portion of the roof until the step is encountered, whereupon the second trolley may be released from the first trolley and rolled onto the seams of the upper portion of the roof.    
   
   
       2 . A system for transporting work materials on a standing seam roof, said system comprising first and second trolleys having wheels with identical lateral spacing, the first trolley having an upper surface with ridges simulating roof seams, whereby a second trolley may be placed with its wheels on said ridges so that, when a step between lower and upper sections of the roof is encountered by the trolley, the second trolley may be rolled off the first trolley onto the upper section of the roof.  
   
   
       3 . The system of  claim 2 , wherein each of said wheels has a peripheral groove for engaging over a room seam.