Abstract: An extendable table has a legged base defining a horizontal support surface extending in longitudinal and transverse directions and having a pair of outer transversely extending edges, a first table panel resting on the support surface and having a transversely extending inner edge intermediate and generally parallel to the outer edges, and a second table panel restable on the support surface, having a transversely extending inner edge buttable with the inner edge of the first panel, and formed with a pair of transversely open and longitudinally extending grooves. Respective rollers on the base underneath the second panel define a transversely extending first pivot axis, and extend transversely into guiding engagement with the grooves. Thus the second panel can slide longitudinally relative to the base on the rollers and can be pivoted on the rollers about the first pivot axis.

Abstract: A structural element, such as a section of a duckboard (e.g. a landing mat) to be removably fastened to a similar section, has one or more edges provided with male coupling formations adapted to be converted into complementary female formations by breaking off a projecting part thereof. The projecting part is generally T-shaped, with its frangible stem rising from the bottom of a preferably dovetail-shaped recess. Such an element can therefore be readily joined to another element having a mortise complementary to the head of the T or a tenon complementary to the recess.

Abstract: A process for making synthetic resin structures in which the double wall element of a synthetic resin is molded with a channel open on one side of the element and into which a reinforcing body is fitted so that the walls of the channel flank this body. Each wall of the channel is provided with a row of openings, preferably extending in the longitudinal direction of the channel, the openings of each row registering with a respective groove formed in the reinforcement body. A cap or cover is molded over the open side of the channel so that portions of the synthetic resin of the cover can penetrate the openings and the grooves which can have a dovetail cross section.

Abstract: An article of furniture having a seat of a generally constant orientation but a back which can be tilted at various angles has a generally X-shaped relationship of the seat and back and, on each side a pair of horizontally spaced pins, affixed to the seat, one of which rides on the upper surface of a cooperating member of the back while the other can be selectively fitted into notches of a rack structure on the lower edge of the respective member. The upper edge or surface of these members have a cam configuration and the distance separating this edge from the bottoms of each of the respective notches is progressively increased downwardly along the rack so that the seat inclination is substantially constant for all positions in which the pins engage the notches.

Abstract: A method of moulding containers consisting of two plastic materials compatible with and sealable to each other, of differing nature and/or color, wherein the material is injected into a space provided between the walls of a mould and a counter-mould, and comprising defining within said space by means of removable separators a first and a second sub-space; injecting into said first sub-space a first one of said materials to fill it fully, injecting into the second sub-space the second material, removing said separators and continuing the injection under pressure of said second material until local interpenetration thereof.

Abstract: A tubular synthetic-resin body usable as a roadway marker comprises spaced upper and lower tubular parts interconnected by thin webs formed integrally with the upper and lower parts. A middle part of contrasting color lies between these upper and lower parts and has grooves receiving the connecting webs. Such a roadway marker is made by fitting the middle part over a core of a mold, and then injecting synthetic-resin material into the mold around this sleeve so as to form the upper and lower parts and the web.

Abstract: Luffas are subject to disintegration into fibers which are carded and needled to a textile support. The resulting product is impregnated with a synthetic resin, dried and calendared to produce a foil from which, for example, inner soles can be cut or stamped.

Abstract: A cupboard, chest or like article of furniture having a top, front wall, side walls and rear wall, has its top wall formed from a panel of wood composition completely encased in a sheath of synthetic resin which also forms a frame around the periphery of the top and is integrally molded with formations adapted to connect the top to the walls of the article. These formations can include tongues or blades adapted to fit snugly into hollows of the walls and/or spaced-apart lips or flanges adapted to receive a wall between them.