Apparatus for forming standing seams along the edges of sheet material

Claim 1

In apparatus for forming a standing seam along the edges of sheets such as metal roofing in which the edges initially have upstanding side by side sections with overlapping laterally directed portions at the upper edges of the upstanding secTions, a. a frame, b. metallic rolls on the frame disposed to engage the overlapped portions of the sheets and bend the edge of one of the overlapped portions under the other, c. other metallic rolls disposed to engage the partially formed seam resulting from the operation set forth in (b ) above and to further bend the portions downwardly, d. a first pair of rolls one of which has a working surface of resilient material such as rubber disposed to engage between them the partially formed seam resulting from the operations set forth in (b) and c. above and to bend the same further downwardly, e. a second pair of cooperating rolls one of which is resilient surfaced and located to operate on the partially formed seam resulting from all the foregoing bending operations to bend the same downwardly to lie alongside the upstanding sections of the sheet, and f. means positively to drive the resilient surfaced rolls defined in (d) and (e) above.