Composite elements of plastic-covered plate for composable structures, especially shelving

Abstract: Composite elements of plastic-covered plate for composable structures, especially shelving, formed by the connection of a flat plate element (11) and a box-type plate element (12), wherein one element acts as a supporting shelf or as an exterior surface of the composable structures and the other element acts as a reinforcing element, wherein the flat plate element (11) is plastic-covered on both of its surfaces (13) and the box-type plate element (12) is plastic-covered on its exterior surface or is plastic-covered on both of its surfaces, the flat plate element (11) being provided with a plurality of non plastic-covered zones (14), which are opposite and connected to a plurality of non plastic-covered and drawn zones (16,17) provided on the plastic-covered exterior surface of the box-type plate element (12).

Description: This invention relates to composite elements of plastic-covered plate for composable structures, especially shelving. Composite structures composed of twin elements or elements which can be linked together, e.g. shelving, shelves, panels, structures for electro-domestic appliances, window and door frames, etc., are at present produced using unit plate elements plastic-covered on one single surface, which may be the exterior surface of the finished product, the other surface being non plastic-covered and capable of being connected by means of welding to identical and complementary surfaces of other elements or reinforcing elements. Once finished, a product of this kind has a non plastic-covered surface which may be of limited or limitative use for particular applications. On the other hand, unit elements of bi-plastic-covered plate, or plate plastic-covered on both of its surfaces directed towards the exterior, are also known. Once unit elements of this kind are assembled together in the required manner, they are able to satisfy the particular market requirements with respect to specialized applications and, at the same time, can result in the production of a more useful product with an improved finish. The object of this invention is to provide a product formed of mono-plastic-covered and/or bi-plastic-covered plate elements which can be used in the production of composable structures without necessarily involving extremely costly production, and able to use welding machines and completely automatic assembly. This problem is solved according to this invention by the production of composite elements of plastic-covered plate for composable structures, especially shelving, formed by the connection of at least one flat plate element and at least one box-type plate elements, wherein one element acts as a supporting shelf or as an exterior surface of said composable structures and the other element acts as a reinforcing element, characterized in that said at least one flat plate element is plastic-covered on both of its surfaces and said at least one box-type plate element is plastic-covered at least on its exterior surface, said at least one flat plate element being provided with a plurality of non plastic-covered zones, which are opposite and connected to a plurality of non plastic-covered and drawn zones provided on the plastic-covered exterior surface of said at least one box-type plate element. Said at least one box-type plate element is preferably plastic-covered on both of its surfaces and has openings aligned with said non plastic-covered zones provided on one surface for the introduction of a spot-welding electrode in correspondence with the interior surface of said at least one box-type plate element, wherein the latter has said drawn zones. The composite elements according to this invention are advantageously produced by a method consisting of a phase for preparing at least one flat plate element plastic-covered on both of its surfaces and at least one box-type plate element plastic-covered at least on its exterior surface, a phase for producing a plurality of non plastic-covered zones on said at least one flat plate element, a phase for producing non plastic-covered zones on the exterior surface of said at least one box-type plate element and for producing drawing work in correspondence with these last-mentioned zones, and a phase for disposing the two abovementioned elements opposite said non plastic-covered zones and connecting one to the other by means of electric welding so as to join together said at least two elements. The method preferably also provides for a phase for producing in said at least one box-type plate element plastic-covered on both of its surfaces openings aligned with said non plastic-covered zones provided on one surface for the introduction of a spot-welding electrode in correspondence with the interior surface of said at least one box-type plate element, where the latter has said drawn zones. The structural and functional features and advantages of the composite elements according to this invention will be more readily understood from the following description given by way of a non-limiting example with reference to the accompanying schematic drawings, in which: Fig. 1 shows an exploded section of an example of a composite element according to this invention; Fig. 2 shows a section identical to that of Fig. 1, with the composite element in its final arrangement; Fig. 3 shows an exploded section of a second embodiment of the composite element according to this invention, and Fig. 4 shows a section identical to that of Fig. 3, with the composite element in its final arrangement. With reference to the drawings, a composite element of plate for composable structures, especially for shelving, but equally suitable for the production of shelves, panels, structures for electro-domestic appliances, window and door frames, furniture in general and coverings, comprises, in diagrammatic form, at least one substantially flat plate element, designated in general by the reference numeral 11, and at least one box-type plate element, designated in general by the reference numeral 12. In the example illustrated, a supporting or shelf element formed essentially of a flat supporting surface and a series of reinforcing cross members is to be produced. These supporting elements are not shown in their totality but merely and essentially in correspondence with a smaller portion of the flat surface and of a reinforcing beam. The flat plate element 11 is formed of a plate 10 plastic-covered by means of a film 13, e.g. of PVC, held in place by the interposition of an adhesive agent, on both of its surfaces and on which are provided non plastic-covered zones 14, e.g. by removing the film 13 of PVC and the associated interposed adhesive by means of appropriate removing tools. The box-type plate element 12, formed of a plate 9 plastic-covered by means of the film 13 on at least one surface, in the example, the surface exterior, is obtained by means of appropriate blanking so as to form a series of openings 15 and, after portions of film in localized zones 16 have been removed by means of appropriate removing tools, is provided with drawing work 17 directed towards the exterior of the appropriate element in correspondence with said zones without the film 16. Alternatively, the box-type plate element can be plastic-covered on both its interior and exterior surfaces. These elements 12 are successively folded over to produce a box shape so as to define a corresponding position between the openings 15 and the associated drawing work 17. In the case of the example illustrated in the drawings, in view of the fact that the box-type plate element 12 has two mirror-like portions alongside one another defined by its folds and provided with two parallel rows of both openings 15 and drawing work 17, the distance between the two rows of openings 15 and drawing work 17 should be equal to the distance of the two corresponding rows of non plastic-covered zones 14 of the flat plate element 11. The composite element of plate in its final form will be produced by assembly and by being locked in its final position by means of spot-welding effected by the introduction of two rows of electrodes, indicated by the broken lines at 18, which define the passage of the current with fusion of the drawing work 17 directed towards the exterior and in contact with the non plastic-covered zones 14 and with the production of joining points. This results in a composite element of plate having both its surfaces directed towards the exterior completely plastic-covered, and it is possibile to obtain elements of this kind in spite of at least one element of plate having both of its exterior surfaces plastic-covered. As mentioned briefly hereinabove, an element composed in this manner is produced by a method consisting essentially of a phase for preparing at least one substantially flat plate element plastic-covered on both of its surfaces and at least one box-type plate element essentially plastic-covered on its exterior surface by means of a covering of film held firmly in position by means of an adhesive agent. The at least two elements of plate are subjected successively to the action of appropriate tools for removing the film from localized zones, so as to produce a plurality of non plastic-covered zones on said at least one substantially flat plate element and to produce non plastic-covered zones on the exterior surface of said at least one box-type plate element. Following the non plastic-covered zones of the box-type element, said element is also provided with drawing work directed towards the exterior. Before these operations are effected, said at least one box-type plate element is preferably provided with openings aligned with said non plastic-covered zones provided on one surface opposite to the surface without the film. The openings are such that they permit the introduction of spot-welding electrodes so as to bring them into correspondence with the interior surface of said at least one box-type plate element, where the latter has said drawn zones. The spot-welding in correspondence with these last-mentioned zones is effected once the two above mentioned elements have been disposed opposite said non plastic-covered zones in such a way that they are joined together by means of electric welding. As indicated hereinabove, the method allows for the production of a composite element whose surfaces directed towards the exterior are plastic-covered, and the junction of the component parts is obtained in spite of the fact that at least one of these components has its exterior surfaces completely plastic-covered. The second embodiment shown in Figures 3 and 4 illustrates a composite element of plate for composable structures essentially having the same form as the composite element described and illustrated hereinbefore, but differing therefrom essentially in that a plastic-covered film 113 is also disposed on the interior surface of the box-type plate element which is designated in general by the reference numeral 112 and has a simpler single-box structure. It should be noted that the reference numerals relating to similar elements have been varied in that they are increased by 100.

Claims: Composite elements of plastic-covered plate for composable structures, especially shelving, formed by the connection of at least one flat plate element (11,111) and at least one box-type plate element (12,112), wherein one element acts as a supporting shelf or as an exterior surface of said composable structures and the other element acts as a reinforcing element, characterized in that said at least one flat plate element (11,111) is plastic-covered (13,113) on both of its surfaces and said at least one box-type plate element (12,112) is plastic-covered (13,113) at least on its exterior surface, said at least one flat plate element (11,111) being provided with a plurality of non plastic-covered zones (14,114), which are opposite and connected to a plurality of non plastic-covered (16,116) and drawn (17,117) zones provided on the plastic-covered exterior surface of said at least one box-type plate element (12,112). Composite elements according to claim 1, characterized in that said at least one box-type plate element (112) is plastic-covered (113) on both of its surfaces. Composite elements according to claim 1, characterized in that said at least one box-type plate element (12,112) has openings (15,115) aligned with said non plastic-covered zones (16,116) provided on one surface for the introduction of a spot-welding electrode (18,118) in correspondence with the interior surface of said at least one box-type plate element (12,112), wherein the latter has said drawn zones (17,117). Composite elements according to claim 1, characterized in that said drawn zones (17,117) are directed towards the exterior of said element (12,112). Composite elements according to claim 1, characterized in that said at least one flat plate element (11) is provided with two parallel rows of non plastic-covered zones (14) and in that said at least one box-type plate element (12) is provided with two rows of openings (15) and drawing work (17) in correspondence with said non plastic-covered zones (16), wherein the distance between the two rows of openings (15) and drawing work (17) is equal to the distance of the two corresponding rows of non plastic-covered zones (16) of the flat plate element (11). Method for the production of composite elements according to any one of the preceding claims, characterized in that it comprises a phase for preparing at least one flat plate element (11,111) plastic-covered (13,113) on both of its surfaces and at least one box-type plate element (12,112) plastic-covered (13,113) at least on its exterior surface, a phase for producing a plurality of non plastic-covered zones (14,114) on said at least one flat plate element (11,111), a phase for producing non plastic-covered zones (16,116) on the exterior surface of said at least one box-type plate element (12,112) and for producing drawing work (17,117) in correspondence with these last-mentioned zones (16,116), and a phase for disposing the two abovementioned elements opposite said non plastic-covered zones and connecting one to the other by means of electric welding so as to join together said at least two elements (11,111;12,112). Method according to claim 6, characterized moreover by preparing said at least one box-type plate element (112) plastic-covered (113) on both of its surfaces. Method according to claim 6, characterized in that it comprises moreover a phase for producing in said at least one box-type plate element (12,112) openings (15,115) aligned with said non plastic-covered zones (16,116) provided on one surface for the introduction of a spot-welding electrode (18,118) in correspondence with the interior surface of said at least one box-type plate element (12,112), where the latter has said drawn zones (17,117).

Inventors: MARZARO ROBERTO, MARZARO, ROBERTO
Applicants: ARNEG, ARNEG S.P.A.
Application year: 1990
Main classification: B29C65
IPC codes: B29C65