MXPA96004928A - Electrically conductor connection better - Google Patents

Abstract

An electrically conductive connection and the method for making it, comprising deforming a part of an end of a composite sheet having a conductive layer and an insulating layer, folding a portion of the deformed part into a first leg with the insulating layer in the part Inside the curvature, bend a part of a second end of the sheet in a second leg with the insulating layer on the outside of the curvature, juxtapose the two legs and compress them to form a continuous contact connection between the conductive layers of the ends, forming the sheet in a magnetically protective frame with the connection placed on the inside of the frame

Description

ELECTRICALLY IMPROVED CONDUCTOR CONNECTION DESCRIPTION BACKGROUND AND FIELD OF THE INVENTION This invention relates to an electrically conductive connection or junction, and more specifically to a connection constructed of a sheet of electrically conductive material which has a surface covered with an electrically insulating coating, and whose connection is useful in the manufacture of magnetic shielding for electric appliances. More specifically, the invention relates to magnetically protected frames constructed of such a sheet, with the connection placed inside the frame. It is known in the state of the art to provide hollow frames for magnetic protection of electrical appliances. For example, U.S. No. 5,028,740 describes such a frame which comprises an electrically conductive sheet, one of whose surfaces is covered with an insulating material such as paint, resin, etc. A connection is formed by bending one end of a blade of such a fork-shaped material and that bent end is connected to the other end of the blade by means of rivets or screws. The U.S. patent No. 2,876,275 shows a protection panel which comprises a rigid member, such as plywood, provided with a metal coating terminating in L-shaped parts which can be closed together to provide continuity of electrical conduction from panel to panel. The U.S. patent No. 3,340,587 describes electromagnetic protective covers in which the panels are placed in edge-to-edge relationship, with U-shaped spring clips into which the flanks of the panel are inserted to provide an electrically continuous wall of panels. The U.S. patent No. 5,198,290 discloses an electromagnetic shielding material comprising a flexible cloth base, a first metal film formed by spray metallization, such as Zn, on one side of the cloth and a second metal film, such as aluminum foil, formed on the other side of the fabric. No connection is shown The U.S. patent No. 4,652,695 discloses a fastener which encloses an end of a knit mesh material and is adapted to be installed around the periphery of a door in a protective box to maintain electrical continuity in the box. Nothing in the prior art provides a connection in a conductive sheet of metal having an insulated surface, formed only by bending the sheet. This invention is an improvement to that of the serial patent application No. 08 / 328,141 which refers to a connection formed by bending opposite edges of a sheet of conductive metal coated with an electrically insulating material, in which the sheet is formed in a protective container with the connection formed on the outside of the container. Therefore, it is an object of the invention to provide an electrically conductive interior connection of a sheet of conductive material coated on a surface thereof with an electrically insulating material, only by suitable bending of the sheet of composite material. This is done by providing one end of the sheet with a deformed part and then bending an end part of the deformed part in the form of a first sloping leg, with the insulating material on the inside of the leg. The other end of the blade is bent in the form of a second sloping leg with the insulating material on the outside of the leg. Subsequently the two hanging legs are juxtaposed and the two ends are compressed in the form of a connection in which the electrically conductive surfaces are in face-to-face contact, providing continuity of electrical conduction and the connection thus formed is placed inside a Protective container built from the sheet.

DESCRIPTION OF THE DRAWINGS Figure 1 is an isometric view of both ends of the sheet further characterized in that one of the opposite edges of the sheet is provided with a deformed part which forms a first sloping leg and the other opposite edge of the sheet is bent at an angle which forms a second leg pending. Figure 2 is an isometric view of the two ends of the blade armed with the first and second legs juxtaposed and compressed in the form of a final connection built into a cavity, magnetic protective frame built of sheet material. Figure 1 shows a first step of forming the inventive connection further characterized in that a sheet 1 comprises an electrically conductive layer 2 p. ex. of metal such as aluminum or copper, and an electrically insulating layer 3, p. ex. of a polyvinyl chloride (PVC), shown in shaded lines. A first end 4 of the sheet 1 is bent as in 6, providing a deformed part 7. The deformed part 7 is bent as in 8 and 9, forming a first leg 11 at an acute angle to the remainder of the deformed part and in where the insulating layer 3 is on the inside of the curvature. In Figure 1 there is also shown a second end 12 of the composite sheet, folded as in 13, providing a second slope leg 14 forming an acute angle with the remainder of the second end of the sheet and wherein the insulating layer 3 is in the outer part of the curvature.

As shown in Figure 2, when the end 4 and the end 12 of the formed sheet are assembled, the first slope leg 11 is juxtaposed to the second slope leg 14 and, when this assembly is compressed, the legs 12 and 14 compressed provide metal to metal continuous contact, as in 16. As also shown in Figure 2, a hollow frame is formed, denoted generally by the number 17 with the ends 4 and 12 of the sheet of material connected with a formed connection 18, placed on the inside of the frame, leaving only a narrow seam 19 on the outside of the frame. Such a frame is useful for magnetically enclosing and protecting an electrical appliance, and, with the stitching on the inside of the frame, makes an aesthetically pleasing presentation. The connection of the invention does not require any separate joining means such as rivets, screws, clasps or the like but is formed only by bending and arming the ends of the composite material sheet and compressing the assembly thus securing the ends in their position and forming a continuous electrical contact between the compressed ends of the blade.

Claims (9)

1. A method for forming an electrically conductive connection in a sheet of material having upper and lower surfaces in which one surface is formed of an electrically conductive layer and the other is formed of a layer of electrically insulating material superimposed and electrically bonded to the layer conductive, characterized in that it comprises deforming a part of a first end of the sheet of material, the deformed part extends parallel to the upper and lower surfaces of the sheet of material and is separated from the remainder of one end of the sheet of material , bending an edge portion of the deformed part in the shape of a first sloping leg which forms an angle with the remainder of the deformed part and having the insulating layer on the inside of the curvature, bending an edge part of a second end of the sheet of material in the form of a second, sloping leg which forms an angle with the remainder of the second leg or the sheet of material and having the insulating layer on the outside of the curvature, assemble the first and second ends of the sheet of material with the first and second legs hanging, juxtapose one to the other, and compress the assembly for collapsing the first and second legs in a position parallel to the upper and lower surfaces of the sheet of material by means of which the first and second legs are in face-to-face contact forming a continuous electrically conductive contact.

2. A method for making an electrically conductive connection characterized in that it comprises deforming a part of one end of a composite sheet having a conductive layer and an insulating layer, bending a portion of the deformed portion in a first leg with the insulating layer in the inner part of the curvature, bending an edge part of a second end of the sheet in a second leg with the insulating layer on the outside of the curvature, juxtaposing the two legs and compressing them to form a continuous contact between the conductive layers of The two extremes.

3. A connection formed in accordance with the method of claim 1.

4. A connection formed in accordance with the method of claim 2.

5. An electrically conductive connection constructed of a sheet of material comprising a layer of conductive material and having a sheet surface coated with an electrically insulating layer, characterized in that it comprises a first sheet end having a deformed portion and an edge portion of the deformed portion folded in the form of a first leg which hangs which forms an angle with the remainder of the deformed part with the insulating layer being on the inside of the curvature, a second end of the sheet having an edge portion thereof bent into a second sloping leg that forms an angle with the remainder of the second end of the sheet being the insulating layer on the outside of the curvature, where, when the first and second ends of the sheet are juxtaposed With the first and second legs in face-to-face relation to each other and compressed, the connection provides continuous electrical contact between the electrically conductive layers of the two ends of the sheet.

6. A hollow frame for magnetically enclosing and protecting an electrical apparatus, characterized in that it comprises a sheet having an electrically conductive layer and an electrically insulating layer, first and second sheet ends forming a connection in accordance with claim 3, with which provides a continuous electrical circuit over a periphery of the frame and is placed in the internal part of the frame. A hollow frame for magnetically enclosing and protecting an electrical appliance, characterized in that it comprises a sheet having an electrically conductive layer and an electrically insulating layer, first and second sheet ends forming a connection in accordance with claim 4 by means of which provides a continuous electrical circuit on a periphery of the frame and where the connection is placed inside the frame. 8. A connection according to claim 3, further characterized in that the electrically conductive layer is aluminum. 9. A connection according to claim 7, further characterized in that the electrically insulating layer comprises polyvinyl chloride. VMRA (9ól01) 09/96