CA2186438C - Improved electrically conductive joint - Google Patents
Improved electrically conductive joint Download PDFInfo
- Publication number
- CA2186438C CA2186438C CA002186438A CA2186438A CA2186438C CA 2186438 C CA2186438 C CA 2186438C CA 002186438 A CA002186438 A CA 002186438A CA 2186438 A CA2186438 A CA 2186438A CA 2186438 C CA2186438 C CA 2186438C
- Authority
- CA
- Canada
- Prior art keywords
- sheet
- electrically conductive
- layer
- joint
- insulative layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0015—Gaskets or seals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
Abstract
An electrically conductive joint and method of making, comprising off-setting a portion of one end of a composite sheet having a conductive layer and an insulative layer, bending a part of the off-set portion into a first leg with the insulative layer on the inside of the bend, bending an edge portion of a second end of the sheet into a second leg with the insulative layer on the outside of the bend, juxtaposing the two legs and compressing them to form a continuous contact joint between the conductive layers of the two ends, forming the sheet into a magnetically-shielding housing with the joint disposed on the inside of the housing.
Description
IMPROVED ELECTRICALLY CONDUCTIVE JOINT
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to an electrically conductive joint, and more specifically to a joint formed of a sheet of electrically conductive material having one surface coated with an electrically insulating coating, and which joint is useful in the fabrication of magnetic shielding for electrical apparatus.
More specifically, the invention is directed to a magnetically-shielding housing formed of such sheet, with the joint disposed on the inside of the housing.
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to an electrically conductive joint, and more specifically to a joint formed of a sheet of electrically conductive material having one surface coated with an electrically insulating coating, and which joint is useful in the fabrication of magnetic shielding for electrical apparatus.
More specifically, the invention is directed to a magnetically-shielding housing formed of such sheet, with the joint disposed on the inside of the housing.
2. Related Prior Art It is known in the prior art to provide hollow housings for magnetic shielding of electrical apparatus. For example, U.S.
Patent No. 5,028,740 discloses such a housing comprising an electrically conductive sheet, one surface of Which is coated the an insulating material such as a paint, resin, etc. A
joint is formed by bending one end of a sheet of such material into a hairpin shape and connecting that bent end to the other end of the sheet by means of rivets or screws.
U:S. Patent No. 2,876,.275 shows a shielding panel comprising a rigid member, such as plywood, provided with a metal sheathing terminating in L-shaped portions which can be locked together to provide continuity of electrical conductivity from panel-to-panel.
U.S. Patent No. 3,340,587 discloses electromagnetic shielding enclosures wherein panels are disposed in edge-to-edge relationship, with U-shaped spring clips into which panel flanges are inserted to provide an electrically continuous wall of panels.
U.S. Patent No. 5,198,290 discloses an electromagnetic shielding material comprising a flexible base fabric, a first metallic film formed by flame spraying a metal, such as Zn, on one side of the fabric, and a second metallic film, such as A1 foil, formed on the other side of the fabric.
No joint is shown.
U.S. Patent No. 4,652,695 discloses a clip enclosing an end of a knit mesh material and adapted to be installed around the periphery of a door in a shielding enclosure to maintain electrical continuity in the enclosure.
None of such prior art provides a joint in a conductive metal sheet having one insulated surface, formed only by bending the sheet.
This present invention is an improvement of that of U.S. Patent 5,532,427 which is directed to a joint formed by bending opposed edges of a sheet of conductive metal coated with an electrically insulating material, wherein the sheet is formable into a shielding container with the formed joint on the outside of the container.
SUMMARY OF THE INVENTION
Therefore it is an object of the invention to provide an electrically conductive inside joint of a sheet of conductive material coated on one surface thereof with an electrically insulating material merely by properly bending the composite sheet material. This is done by providing one end of the sheet with an off-set portion and then bending an end part of the off-set portion into the form of a first depending leg with the insulating material on the inside of the leg. The other end of the sheet is bent into the form of a second depending leg with the insulating material on the outside of the leg. The two depending legs then are juxtaposed and the two ends compressed into the form of a joint wherein electrically conductive surfaces are in face-to-face contact, providing continuity of electrical conductivity and the thus-formed joint is disposed on the inside of a shielding container formed from the sheet.
In summary, this invention seeks to provide a method of forming an electrically conductive joint in a sheet of material having top and bottom surfaces wherein one surface is formed of an electrically conductive layer and the other surface is formed of a layer of electrically insulative material overlying and bonded to the electrically conductive layer, comprising off-setting a portion of a first end of said sheet material, said off-set portion extending parallel to the top and bottom surfaces of said sheet material and spaced from the remainder of said one end of said sheet material, bending an edge part of the off-set portion into the form of a first dependent leg forming an angle with the remainder of the off-set portion and having said insulative layer on the inside of the bend, bending an edge portion of a second end of said sheet material into the form of a second dependent leg forming an angle with the remainder of said second end of said sheet material and having said insulative layer on the outside of the bend, assembling the first and second ends of the sheet material with the first and second dependent legs juxtaposed to each other, and compressing the assembly to collapse said first and second legs into a position parallel to the top and bottom surfaces of the sheet material whereby conductive surfaces of the first and second legs are in face-to-face relationship forming a continuous electrically conductive contact.
Patent No. 5,028,740 discloses such a housing comprising an electrically conductive sheet, one surface of Which is coated the an insulating material such as a paint, resin, etc. A
joint is formed by bending one end of a sheet of such material into a hairpin shape and connecting that bent end to the other end of the sheet by means of rivets or screws.
U:S. Patent No. 2,876,.275 shows a shielding panel comprising a rigid member, such as plywood, provided with a metal sheathing terminating in L-shaped portions which can be locked together to provide continuity of electrical conductivity from panel-to-panel.
U.S. Patent No. 3,340,587 discloses electromagnetic shielding enclosures wherein panels are disposed in edge-to-edge relationship, with U-shaped spring clips into which panel flanges are inserted to provide an electrically continuous wall of panels.
U.S. Patent No. 5,198,290 discloses an electromagnetic shielding material comprising a flexible base fabric, a first metallic film formed by flame spraying a metal, such as Zn, on one side of the fabric, and a second metallic film, such as A1 foil, formed on the other side of the fabric.
No joint is shown.
U.S. Patent No. 4,652,695 discloses a clip enclosing an end of a knit mesh material and adapted to be installed around the periphery of a door in a shielding enclosure to maintain electrical continuity in the enclosure.
None of such prior art provides a joint in a conductive metal sheet having one insulated surface, formed only by bending the sheet.
This present invention is an improvement of that of U.S. Patent 5,532,427 which is directed to a joint formed by bending opposed edges of a sheet of conductive metal coated with an electrically insulating material, wherein the sheet is formable into a shielding container with the formed joint on the outside of the container.
SUMMARY OF THE INVENTION
Therefore it is an object of the invention to provide an electrically conductive inside joint of a sheet of conductive material coated on one surface thereof with an electrically insulating material merely by properly bending the composite sheet material. This is done by providing one end of the sheet with an off-set portion and then bending an end part of the off-set portion into the form of a first depending leg with the insulating material on the inside of the leg. The other end of the sheet is bent into the form of a second depending leg with the insulating material on the outside of the leg. The two depending legs then are juxtaposed and the two ends compressed into the form of a joint wherein electrically conductive surfaces are in face-to-face contact, providing continuity of electrical conductivity and the thus-formed joint is disposed on the inside of a shielding container formed from the sheet.
In summary, this invention seeks to provide a method of forming an electrically conductive joint in a sheet of material having top and bottom surfaces wherein one surface is formed of an electrically conductive layer and the other surface is formed of a layer of electrically insulative material overlying and bonded to the electrically conductive layer, comprising off-setting a portion of a first end of said sheet material, said off-set portion extending parallel to the top and bottom surfaces of said sheet material and spaced from the remainder of said one end of said sheet material, bending an edge part of the off-set portion into the form of a first dependent leg forming an angle with the remainder of the off-set portion and having said insulative layer on the inside of the bend, bending an edge portion of a second end of said sheet material into the form of a second dependent leg forming an angle with the remainder of said second end of said sheet material and having said insulative layer on the outside of the bend, assembling the first and second ends of the sheet material with the first and second dependent legs juxtaposed to each other, and compressing the assembly to collapse said first and second legs into a position parallel to the top and bottom surfaces of the sheet material whereby conductive surfaces of the first and second legs are in face-to-face relationship forming a continuous electrically conductive contact.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is an isometric view of both ends of the sheet wherein one of the opposed edges of the sheet is provided with an off-set portion forming a first dependent leg and the other opposed edge of the sheet is bent in an angle forming a second dependent leg;
Fig. 2 is an isometric view of the two ends of the sheet assembled with the first and second legs juxtaposed and compressed into the form of a final joint formed on the inside 3a r of a hollow, magnetic-shielding housing formed of the sheet material.
DESCRIPTION OF PREFERRED
Fig. 1 shows a first stage of formation of the inventive joint wherein a sheet 1 comprises an electrically conductive layer 2 e.g. of metal such as aluminum or copper, and an electrically insulative layer 3, e.g. of a polyvinyl chloride (PVC), shown in hatched lines. A first end 4 of the sheet 1 is bent as at 6, providing an off-set portion 7.
Off-set portion 7 is bent as at 8 and 9, forming a first dependent leg 11 at an acute angle to the remainder of the off-set portion and wherein the insulative layer 3 is on the inside of the bend.
In Fig. 1 there also is shown a second end 12 of the composite sheet, bent as at 13, providing a second dependent leg 14 forming an acute angle with the remainder of the second end of the sheet and wherein the insulative layer 3 is on the outside of the bend.
As shown in Fig. 2, when end 4 and end 12 of the formed sheet are assembled, the first dependent leg 11 is juxtaposed to the second dependent leg 14 and, when this assembly is compressed, the collapsed dependent legs 11 and 14 provide continuous metal-to-metal contact, as at 16.
As also shown in Fig. 2, a hollow housing denoted generally by the numeral 17 is formed with ends 4 and 12 of the sheet material connected with a formed joint 18, disposed on the r inside of the housing, leaving only a narrow seam 19 on the outside of the housing. such a housing is useful for surrounding and magnetically shielding an electrical apparatus, and, with the seam on the inside of the housing, makes an aesthetically pleasing presentation.
The joint of the invention. requires no separate joining means such as rivets, screws, clips or the like but is formed only by bending and assembling the ends of the composite sheet material and compressing the assembly thereby locking the ends l0 in place and forming a continuous electrical contact between the compressed ends of the sheet.
Fig. 1 is an isometric view of both ends of the sheet wherein one of the opposed edges of the sheet is provided with an off-set portion forming a first dependent leg and the other opposed edge of the sheet is bent in an angle forming a second dependent leg;
Fig. 2 is an isometric view of the two ends of the sheet assembled with the first and second legs juxtaposed and compressed into the form of a final joint formed on the inside 3a r of a hollow, magnetic-shielding housing formed of the sheet material.
DESCRIPTION OF PREFERRED
Fig. 1 shows a first stage of formation of the inventive joint wherein a sheet 1 comprises an electrically conductive layer 2 e.g. of metal such as aluminum or copper, and an electrically insulative layer 3, e.g. of a polyvinyl chloride (PVC), shown in hatched lines. A first end 4 of the sheet 1 is bent as at 6, providing an off-set portion 7.
Off-set portion 7 is bent as at 8 and 9, forming a first dependent leg 11 at an acute angle to the remainder of the off-set portion and wherein the insulative layer 3 is on the inside of the bend.
In Fig. 1 there also is shown a second end 12 of the composite sheet, bent as at 13, providing a second dependent leg 14 forming an acute angle with the remainder of the second end of the sheet and wherein the insulative layer 3 is on the outside of the bend.
As shown in Fig. 2, when end 4 and end 12 of the formed sheet are assembled, the first dependent leg 11 is juxtaposed to the second dependent leg 14 and, when this assembly is compressed, the collapsed dependent legs 11 and 14 provide continuous metal-to-metal contact, as at 16.
As also shown in Fig. 2, a hollow housing denoted generally by the numeral 17 is formed with ends 4 and 12 of the sheet material connected with a formed joint 18, disposed on the r inside of the housing, leaving only a narrow seam 19 on the outside of the housing. such a housing is useful for surrounding and magnetically shielding an electrical apparatus, and, with the seam on the inside of the housing, makes an aesthetically pleasing presentation.
The joint of the invention. requires no separate joining means such as rivets, screws, clips or the like but is formed only by bending and assembling the ends of the composite sheet material and compressing the assembly thereby locking the ends l0 in place and forming a continuous electrical contact between the compressed ends of the sheet.
Claims (7)
1. A method of forming an electrically conductive joint in a sheet of material having top and bottom surfaces wherein one surface is formed of an electrically conductive layer and the other surface is formed of a layer of electrically insulative material overlying and bonded to the electrically conductive layer, comprising off-setting a portion of a first end of said sheet material, said off-set portion extending parallel to the top and bottom surfaces of said sheet material and spaced from the remainder of said one end of said sheet material, bending an edge part of the off-set portion into the form of a first dependent leg forming an angle with the remainder of the off-set portion and having said insulative layer on the inside of the bend, bending an edge portion of a second end of said sheet material into the form of a second dependent leg forming an angle with the remainder of said second end of said sheet material and having said insulative layer on the outside of the bend, assembling the first and second ends of the sheet material with the first and second dependent legs juxtaposed to each other, and compressing the assembly to collapse said first and second legs into a position parallel to the top and bottom surfaces of the sheet material whereby conductive surfaces of the first and second legs are in face-to-face relationship forming a continuous electrically conductive contact.
2. A method of making an electrically conductive joint comprising off-setting a portion of one end of a composite sheet having a conductive layer and an insulative layer, bending a part of the off-set portion into a first leg with the insulative layer on the inside of the bend, bending an edge portion of a second end of the sheet into a second leg with the insulative layer on the outside of the bend, juxtaposing the two legs and compressing them to form a continuous contact between the conductive layers of the two ends.
3. An electrically conductive joint formed of a sheet material comprising a layer of conductive material and having one surface of the sheet coated with an electrically insulative layer, comprising a first end of the sheet having an off-set portion and an edge part of the off-set portion bent into the form of a first depending leg forming an angle with the remainder of the off-set portion with the insulative layer on the inside of the bend, a second end of the sheet having an edge portion thereof bent into the form of a second dependent leg forming an angle with the remainder of the second end of the sheet with the insulative layer on the outside of the bend, wherein, when the first and second ends of the sheet are juxtaposed with the first and second legs in face-to-face relationship with each other and compressed, the joint provides continuous electrical contact between the electrically conductive layers of the two ends of the sheet.
4. A hollow housing for surrounding and magnetically shielding an electrical apparatus, comprising a sheet having an electrically conductive layer and an electrically insulative layer, first and second ends of the sheet forming a joint in accordance with claim 3 whereby there is provided a continuous electrical circuit about a periphery of the housing and disposed inside the housing.
5. A joint according to claim 3, wherein the electrically conductive layer is aluminium.
6. A joint according to claim 3, wherein the electrically insulative layer comprises a polyvinyl chloride.
7
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/656,464 US5796033A (en) | 1996-05-31 | 1996-05-31 | Electrically conductive joint |
| US08/656,464 | 1996-05-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2186438A1 CA2186438A1 (en) | 1997-12-01 |
| CA2186438C true CA2186438C (en) | 2001-01-02 |
Family
ID=24633142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002186438A Expired - Fee Related CA2186438C (en) | 1996-05-31 | 1996-09-25 | Improved electrically conductive joint |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5796033A (en) |
| CA (1) | CA2186438C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6977337B1 (en) | 2004-06-16 | 2005-12-20 | Visteon Global Technologies, Inc. | Electronic assembly packaging |
| WO2006063169A1 (en) * | 2004-12-08 | 2006-06-15 | General Dynamics Armament And Technical Products, Inc. | Seam bracket for emi shielded structure |
| US7012190B1 (en) * | 2004-12-08 | 2006-03-14 | General Dynamics Armament And Technical Products, Inc. | Seam bracket for EMI shielded structure |
| US8039763B1 (en) * | 2005-03-15 | 2011-10-18 | Stealthdrive, Inc. | EMI-shielding solutions for computer enclosures using combinations of two and three-dimensional shapes formed in sheet metal |
| DE102005023344A1 (en) * | 2005-05-17 | 2006-11-23 | Wolfgang Kessel | Electromagnetic shielding against high frequency radiation comprises overlapping electrically conducting braiding or grid sections that are electrically conductively connected together and connected to earth potential |
| US20060287112A1 (en) * | 2005-06-15 | 2006-12-21 | Mallory Chester L | Gaming machine with a coin collector |
| WO2023077066A1 (en) * | 2021-10-28 | 2023-05-04 | Atieva, Inc. | Conductive joint between shielded composites and metal parts |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2876275A (en) * | 1953-08-12 | 1959-03-03 | Richard B Schulz | Shielding panel and joint construction |
| US3340587A (en) * | 1965-11-26 | 1967-09-12 | Herbert K Beyer | Method of fabricating shielding enclosures |
| US4652695A (en) * | 1983-06-20 | 1987-03-24 | Pawling Corporation | Mesh-covered core strip for high frequency RFI/EMI radiation shielding |
| JPH0636617Y2 (en) * | 1988-09-03 | 1994-09-21 | 岩崎通信機株式会社 | Tubular outer case |
| JPH03156998A (en) * | 1989-11-14 | 1991-07-04 | Yoshio Niioka | Radiowave shield |
| US5532427A (en) * | 1994-10-24 | 1996-07-02 | Gerome Manufacturing Company, Inc. | Electrically conductive joint |
-
1996
- 1996-05-31 US US08/656,464 patent/US5796033A/en not_active Expired - Lifetime
- 1996-09-25 CA CA002186438A patent/CA2186438C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| MX9604928A (en) | 1997-11-29 |
| US5796033A (en) | 1998-08-18 |
| CA2186438A1 (en) | 1997-12-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |