JIG FOR WELDING MITERED JOINTS BETWEEN THE MEMBERS OF MOLDED PLASTIC WINDOW AND DOOR FRAMES

摘要

A JIG for WELDING MITERED JOINTS BETWEENthe MEMBERS of MOLDED PLASTIC WINDOW andDOOR FRAMESABSTRACT of the DISCLOSUREA jig for welding mitered joints between membersof molded plastic window and door frames, comprisingfour mutually positionable clamp assemblies, one toeach corner of the frame, each of which comprises apair of horizontal rests serving to support the membersof the frame, and respective upwardly-projecting fencesdisposed transversely and parallel to the horizontalexit path followed by the frames, that register withthe external faces of the rails and the uprights of theframe; each clamp assembly further comprises a pair ofplates, located above the corresponding pairs of rests,that serve-to hold the frame members fast against therests as and when necessary. The fences disposed trans-versely to the exit path of the welded frame areembodied independently of the relative rests, andcapable of movement between a first limit position, inwhich the rails are checked, and a second limit positionin which the rails are freed and the fences themselvescompletely clear of the frame's transverse dimension.fig 1