Patent GB-634148-A (GB)
Title: Improvements in or relating to prefabricated metal components for partitions, doors and the like
IPC: E06B3/72
Filed: 1945-10-18
Abstract: 634,148. Composite metal frames ; panels ; joining metal sheets. DAVIDGE, A. Oct. 18, 1945, No 27382. [Classes 20 (ii), 20 (iii) and 87 (i)] A door, panel or partition is formed of readily separable sheet metal components one at least of which has some or all of its free edges flanged and the flanged part doubled back outwards to provide interlocking engagement when assembled with another component having doubled back edges, the doubled back parts lying in parallel planes. In the lower left hand comer of a door frame, Fig. 1, the cross piece consists of a channel member 13 with its web cut away from the end to a distance approximately equal to the depth of the channel but leaving sufficient material to provide a flange which is doubled back outwards upon itself as at 16, the gap between the opposed faces so formed being equal to twice the thickness of the material, this flange being cut away at 17 to provide clearance on assembly. The upright consists of a channel member 18, the edges at the end of which are formed with an inwardly projecting flange 20 (see Fig. la), cut away for clearance in the same way as the flange 16. The cross piece 13 and the upright 18 are fitted together by sliding the flanges 20 at the end of the upright under the doubledback flange 16 until the web of the upright comes to rest against the end of the cut in the web of the cross-piece. A clip 21, Fig. 3, consisting of sheet metal with its edges doubled back at 22, is then slid into place with the edges over the flange 20 and under the doubled-back flange 16, as shown in Fig. la. The open sides of the cross-piece and upright are covered by closing members, consisting of shallow channels with their flanges doubled back outwards to interlock with the inwardly doubled back edges 14 and 19 of the crosspiece and upright. Grooves 15 are formed in the webs of the cross-piece and upright to receive the edges of a panel. This panel consists of a sheet of asbestos faced with metal sheets spaced apart by shouldered distance pieces, passing through the asbestos, which are spot-welded in place. In a modification, Fig. 5, the cross-piece and uprights are each formed of two complementary parts 13a, 13a and 18a, 18a respectively, comprising channel members of rectangular cross-section with their free edges flanged and doubled back outwards as at 32, connected by closing members 33, each of which comprises a strip with its longitudinal edges doubled back as at 34 and a flanged clamping member 35, riveted in place, this clamping member co-operating with the doubled back portion 34 to form a joint with the doubled back edges 32. For uniting an upright to a cross-piece a short length of the closing member is riveted to the cross-piece where the upright is to join it, e.g. half-way along, i.e. a short length of a member 33 is riveted back to back to the member 33 which forms the closing member of a cross-piece constructed as described, and this short length of closing member receives the end of the upright. In this construction no provision is made for a panel. In a further modification, Fig. 7, the crosspiece and upright are each formed in two parts 13b, 13b and 18b, 18b, each part comprising a strip flanged along one edge and doubled back inwards, as at 37, the remaining edges being simply doubled back, as at 38. The flanges 37 are joined as shown by a closing member consisting of a strip 39 with its longitudinal edges doubled back at 40. The free outer edges of the components so formed are connected by closing members which comprise strips 41 flanged and doubled back, as at 42, to engage the doubled back portions 38. A panel is included, consisting of a rectangular sheet 43 flanged along each edge to provide engaging lugs 44 projecting in opposite directions from both faces of the panel. The lugs 44 are locked with the cross-pieces and uprights by the closing member 39 (see Fig. 8).