Abstract: In a welding apparatus of the type including a pair of opposing press plates relatively movable toward and away each other and each supporting a molded article to be welded together, and a heating plate movable into and out of a space between separated molded articles for fusing confronting surfaces of the molded articles whereby the molded articles are welded together by applying pressure thereto by the press plates, there are provided mold frames on the press plates. The mold frames define an opening having substantially the same contour as the molded articles to be welded together but having a slightly smaller size than the molded article. The inner surface of the opening is provided with an outwardly inclined surface.

Abstract: A pallet for a fork lift structurally comprises two component parts of thermoplastic resin wherein each of said component parts comprises a deck board and girders integrally formed thereon with at least one girder being disposed along each of the side edges of said deck board and along a line intermediate and parallel to the side edges, at least one of said component parts being provided with numerous ribs integrally formed on said deck board, which are lower in projection than said girders and which in areas not covered by said girders are disposed in decreased distance from one another in the neighborhood of the side edges of the deck board, said component parts being mutually melt adhered together at the respective bottom surfaces of said girders provided thereon, and wherein the deck board is provided with an anti-slip member having an upper and a lower portion and fitted into a hole penetrating a rib interally formed on the deckboard so that the lower portion of the anti-slip member protrudes from the ri

Abstract: In welding apparatus of the type comprising a pair of opposed pressing boards, and a heated platen inserted into and retracted from a space between the pressing boards and the surfaces of the articles to be welded together are fused by the heated platen and then welded together by applying a pressure to the articles, there are provided holding mechanisms for holding the article at the opposing surfaces of the pressing boards and a spacer for defining predetermined gaps between the heated platen and the pressing boards.