WO1986007497A1 - Earthing system for an apparatus cabinet - Google Patents

Earthing system for an apparatus cabinet Download PDF

Info

Publication number
WO1986007497A1
WO1986007497A1 PCT/SE1986/000231 SE8600231W WO8607497A1 WO 1986007497 A1 WO1986007497 A1 WO 1986007497A1 SE 8600231 W SE8600231 W SE 8600231W WO 8607497 A1 WO8607497 A1 WO 8607497A1
Authority
WO
WIPO (PCT)
Prior art keywords
bars
contact
plate
earthing system
contact plate
Prior art date
Application number
PCT/SE1986/000231
Other languages
French (fr)
Inventor
Rolf Torbjörn OLSSON
Hans Olov Wilhelm Andersson
Original Assignee
Telefonaktiebolaget Lm Ericsson
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson filed Critical Telefonaktiebolaget Lm Ericsson
Priority to BR8606722A priority Critical patent/BR8606722A/en
Priority to DE8686903653T priority patent/DE3663099D1/en
Priority to KR1019870700122A priority patent/KR910004011B1/en
Priority to AT86903653T priority patent/ATE42653T1/en
Publication of WO1986007497A1 publication Critical patent/WO1986007497A1/en
Priority to NO870224A priority patent/NO167835C/en
Priority to FI870382A priority patent/FI75692C/en
Priority to DK073187A priority patent/DK163547C/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
    • 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
    • H05K9/0016—Gaskets or seals having a spring contact

Definitions

  • the invention relates to an earthing system for apparatus cabinets containing electrical equipment in accordance with the preamble to the following indepen ⁇ dent claim.
  • One kind of earth connection used so far comprises conductors with cable shoes placed between the apparatus and their stand, the shoes being screwed to the apparatus and to the stand.
  • Another kind of earth connection is a serrated washer placed between the apparatus casing and the plates of the stand. A fastening screw which fastens the apparatus to the stand is taken through this serrated washer.
  • An example of such a contact means is described in SE - C- 7509869 * 9 (387201).
  • Figure 1 illustrates two apparatus cabinets with bars
  • Figure 2 illustrates a junction point between a vertical and horizontal bar
  • Figure 3 and 4 illustrate a spring-biased contact plate
  • Figure 5 illustrates a contact plate inserted in an intersection point between bars
  • Figure 6 illustrates a connection bar between horizontal bars.
  • Two appartus cabinets 1 are' illustrated as .an example in Figure 1, each containing two vertical bars 2 and two horzontal bars 3. Each vertical bar 2 is bent inwards at right angles at each end, and in each cabinet there is an unillustrated connection terminal arranged on one of the bent-in parts for connecting an earth conductor. Any of the four bent-in parts may be used for connecting the earth conductor.
  • a contact plate 4 is disposed, as illustrated in Figure 2, at an intersection point between one of the vertical bars 2, and one of the horizontal bars 3.
  • the vertical bar 2 has a rectangular cross section and is attached to the side wall of the apparatus cabinet with unillustrated fastening screws, while the horizontal bar 3, which is carried by a surrounding plate 5, is fastened to the apparatus cabinet with other fastening screws and pressed against the narrow edge of the vertical bar.
  • the contact plate 4 has a rectangular shape, punched out from sheet metal, and is provided with a plurality of contact tongues, four in the example, which are punched out in a row along the centre line of the plate and alternatingly bent out of the plane of the plate so that there is formed a total of eight contact-making edges 7.
  • the edges 7 are right- angular and sharp to give good electrical contact against the bars.
  • a small part of the short ends 8 of the contact plate is somewhat bent out from one face of the plate to form retaining flanges.
  • the material in the contact plate 4 is tin bronze and is tinned, whereby the plate will give durable electrical contact against the aluminium bars without the danger of corrosion needing to be considered.
  • the contact plate may be made from some other similar material, e.g. beryllium copper.
  • the contact plate 4 is inserted in an opening in the plate 5 and is there pressed between the vertical bar 2 and the horizontal bar 3.
  • the retaining flanges 8 of the contact plate are urged against the edges in the opening of the plate 5 so that the contact plate will be prevented from falling out during assembly, and the contact tongues 6 are bent such that the thickness of the contact plate measured over the edges 7 is greater than the space between both bars, such that the contact edges will engage against the bars with a continuous pressure after insertion. Since the contact plate 4 is disposed in the plate 5 the contact tongues 6 are prevented from being completely pressed together.
  • connection bar 11 for connecting the horizontal bars 3 in side-by-side apparatus cabinets.
  • the material in the connection bar 11 is aluminium and its cross section is substantially rectangular with two low outstanding edges on one of the wide sides of the bar, so that its cross section has the form of a shallow U.
  • two nodules 12 are pressed into the bar along its centre line in the same direction as that of the edges of the bar.
  • the nodules and the edges of the bar are adapted to give retention of the previously described contact plate 4, there being one contact plate at either end of the bar 11.
  • the horizontal bar 3 is provided with a longitudinal groove 13 with a width and depth suited to the reception of the connection bar 11 with its accompanying plate 4 in the manner illustrated by a curved arrow in Figure 6.
  • the thickness of the horizontal bar 3 is adjusted in relation to the width of the groove 13 so that the contact tongues on the contact plate 4 are prevented from being completely pressed together.
  • the apparatus cabinet 1 is provided with a plurality of unillustrated openings at different heights in the side walls of the cabinets.
  • the horizontal bars 3 and indirectly the vertical bars 2 also, in two or more cabinets are electrically connected to each other with one or more connection bar 11, whereby occurring earth currents are effectively spread in the bars and are led away to the earth conductors connected to each cabinet, so that occuring potential rises are limited to a value which is not dangerous.
  • Electronic apparatus placed in the apparatus cabinet 1 are each provided with an earth conductor intended for connection to one of the horzontal bars 3, preferably with a connection means of the kind described in SE-C-7509890-5 (387480) and which is intended for fastening by a screw, screwed into the groove 13 of the horizontal bar.

Abstract

An earthing system for apparatus cabinets containing electronic equipment is made up from vertical bars (2), horizontal bars (3) and connection bars (11) between the horizontal bars, all the bars being made from aluminium. At the connection points between the bars there are mounted contact-making, spring-biased contact plates (4). The contact plate (4) is rectangular and provided with contact tongues (6) arranged in rows projecting from either face of the plate.

Description

EARTHING SYSTEM FOR AN APPARATUS CABINET
TECHNICAL FIELD
The invention relates to an earthing system for apparatus cabinets containing electrical equipment in accordance with the preamble to the following indepen¬ dent claim.
BACKGROUND ART
Where electronic equipment is placed in apparatus cabinets, there is the requirement that occurring earth currents, which can be considerable, shall be led off with a rise in potenial which is so small that the sensitive electronic equipment is not damaged by it. One kind of earth connection used so far, comprises conductors with cable shoes placed between the apparatus and their stand, the shoes being screwed to the apparatus and to the stand. Another kind of earth connection is a serrated washer placed between the apparatus casing and the plates of the stand. A fastening screw which fastens the apparatus to the stand is taken through this serrated washer. An example of such a contact means is described in SE - C- 7509869 * 9 (387201).
DISCLOSURE OF INVENTION
The invention described here includes, inter alia, a further development of the mentioned serrated washer. The invention is characterized as disclosed in the characterizing portions of the following claims.
In the earthing system there are bars which are connected to each other, and together thus have conductive capacity which is so great that occuring earth currents are led away with only a small rise in potential as a result, and spring- biased contact plates at the junction points between the bars give a continous, low transfer resistance between them, although the material of the bars is of soft metal, in this case aluminium, which yields somewhat to compression stress. The horizontal bars in side-by-side apparatus cabinets are united by connection bars of aluminium with the aid of the same spring-biased contact plate as unites the bars in an apparatus cabinet.
BRIEF DESCRIPTION OF DRAWINGS
An example of an earthing system in accordance with the invention is described in the following with reference to the accompanying drawings, where
Figure 1 illustrates two apparatus cabinets with bars
Figure 2 illustrates a junction point between a vertical and horizontal bar
Figure 3 and 4 illustrate a spring-biased contact plate
Figure 5 illustrates a contact plate inserted in an intersection point between bars
Figure 6 illustrates a connection bar between horizontal bars.
EMBODIMENT OF INVENTION
Two appartus cabinets 1 are' illustrated as .an example in Figure 1, each containing two vertical bars 2 and two horzontal bars 3. Each vertical bar 2 is bent inwards at right angles at each end, and in each cabinet there is an unillustrated connection terminal arranged on one of the bent-in parts for connecting an earth conductor. Any of the four bent-in parts may be used for connecting the earth conductor.
A contact plate 4 is disposed, as illustrated in Figure 2, at an intersection point between one of the vertical bars 2, and one of the horizontal bars 3. The vertical bar 2 has a rectangular cross section and is attached to the side wall of the apparatus cabinet with unillustrated fastening screws, while the horizontal bar 3, which is carried by a surrounding plate 5, is fastened to the apparatus cabinet with other fastening screws and pressed against the narrow edge of the vertical bar.
As illustrated in Figures 3 and 4, the contact plate 4 has a rectangular shape, punched out from sheet metal, and is provided with a plurality of contact tongues, four in the example, which are punched out in a row along the centre line of the plate and alternatingly bent out of the plane of the plate so that there is formed a total of eight contact-making edges 7. The edges 7 are right- angular and sharp to give good electrical contact against the bars.
A small part of the short ends 8 of the contact plate is somewhat bent out from one face of the plate to form retaining flanges.
The material in the contact plate 4 is tin bronze and is tinned, whereby the plate will give durable electrical contact against the aluminium bars without the danger of corrosion needing to be considered. Alternatingly, the contact plate may be made from some other similar material, e.g. beryllium copper.
As previously mentioned, and as will be more clearly perceived from Figure 5, the contact plate 4 is inserted in an opening in the plate 5 and is there pressed between the vertical bar 2 and the horizontal bar 3. The retaining flanges 8 of the contact plate are urged against the edges in the opening of the plate 5 so that the contact plate will be prevented from falling out during assembly, and the contact tongues 6 are bent such that the thickness of the contact plate measured over the edges 7 is greater than the space between both bars, such that the contact edges will engage against the bars with a continuous pressure after insertion. Since the contact plate 4 is disposed in the plate 5 the contact tongues 6 are prevented from being completely pressed together.
In the inventive earthing system, there is further included, as will be seen from Figures 1 and 6, a connection bar 11 for connecting the horizontal bars 3 in side-by-side apparatus cabinets. As with other bars, the material in the connection bar 11 is aluminium and its cross section is substantially rectangular with two low outstanding edges on one of the wide sides of the bar, so that its cross section has the form of a shallow U. At either of the connection bar, two nodules 12 are pressed into the bar along its centre line in the same direction as that of the edges of the bar. The nodules and the edges of the bar are adapted to give retention of the previously described contact plate 4, there being one contact plate at either end of the bar 11.
The horizontal bar 3 is provided with a longitudinal groove 13 with a width and depth suited to the reception of the connection bar 11 with its accompanying plate 4 in the manner illustrated by a curved arrow in Figure 6. The thickness of the horizontal bar 3 is adjusted in relation to the width of the groove 13 so that the contact tongues on the contact plate 4 are prevented from being completely pressed together.
To enable mounting the connection bar 11, the apparatus cabinet 1 is provided with a plurality of unillustrated openings at different heights in the side walls of the cabinets.
The horizontal bars 3 and indirectly the vertical bars 2 also, in two or more cabinets are electrically connected to each other with one or more connection bar 11, whereby occurring earth currents are effectively spread in the bars and are led away to the earth conductors connected to each cabinet, so that occuring potential rises are limited to a value which is not dangerous.
Electronic apparatus placed in the apparatus cabinet 1 are each provided with an earth conductor intended for connection to one of the horzontal bars 3, preferably with a connection means of the kind described in SE-C-7509890-5 (387480) and which is intended for fastening by a screw, screwed into the groove 13 of the horizontal bar.

Claims

1. Earthing system for apparatus cabinets containing electrical equipment, in which there are included bars of a yielding, soft metal, e.g. aluminium, for leading off earth currents, characterized by a first kind of bars (2), and a second kind of bars (3) and by contact-making, spring-biased contact plates (4) at the connection points between the bars, the contact plates being inserted in an opening in a plate (5), between the bars (2, 3) to prevent complete pressing together of the contact plate.
2. Earthing system as claimed in claim 1, characterized by an aluminium bar (11) connecting the horizontal bars (3) in sidε-by-side apparatus cabinets 1 and by the said contact-making, spring-biased contact plates (4) in the connection points between the bars.
3. Earthing system as claimed in claim 1 or 2, characterized by the contact plate (4) being rectangular and by contact tongues (6) arranged in rows projecting from both side faces of the contact plate.
4. Earthing system as claimed in claim 3, characterized by a small part of the short ends (8) of the contact plate (4) being bent out from one face of the plate to form retaining flanges.
5. Earthing system as claimed in claim 3, characterized in that the material in the contact plate (4) is tinned tin bronze.
PCT/SE1986/000231 1985-06-14 1986-05-16 Earthing system for an apparatus cabinet WO1986007497A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BR8606722A BR8606722A (en) 1985-06-14 1986-05-16 EARTH CONNECTION SYSTEM FOR APPLIANCE CABINET
DE8686903653T DE3663099D1 (en) 1985-06-14 1986-05-16 Earthing system for an apparatus cabinet
KR1019870700122A KR910004011B1 (en) 1985-06-14 1986-05-16 Earthing system for an apparatus cabinet
AT86903653T ATE42653T1 (en) 1985-06-14 1986-05-16 GROUNDING SYSTEM FOR AN EQUIPMENT CABINET.
NO870224A NO167835C (en) 1985-06-14 1987-01-19 EQUIPMENT EARNINGS SYSTEM.
FI870382A FI75692C (en) 1985-06-14 1987-01-29 JORDNINGSSYSTEM FOER APPARATSKAOP.
DK073187A DK163547C (en) 1985-06-14 1987-02-13 EQUIPMENT EARNINGS SYSTEM

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8502976-7 1985-06-14
SE8502976A SE448331B (en) 1985-06-14 1985-06-14 EARTHING OF CABINETS

Publications (1)

Publication Number Publication Date
WO1986007497A1 true WO1986007497A1 (en) 1986-12-18

Family

ID=20360587

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1986/000231 WO1986007497A1 (en) 1985-06-14 1986-05-16 Earthing system for an apparatus cabinet

Country Status (24)

Country Link
US (1) US4781603A (en)
EP (1) EP0228405B1 (en)
JP (1) JP2597561B2 (en)
KR (1) KR910004011B1 (en)
AU (1) AU590290B2 (en)
BR (1) BR8606722A (en)
CA (1) CA1280802C (en)
DE (1) DE3663099D1 (en)
DK (1) DK163547C (en)
DZ (1) DZ939A1 (en)
EG (1) EG19801A (en)
ES (1) ES296718Y (en)
FI (1) FI75692C (en)
GR (1) GR861358B (en)
IE (1) IE57363B1 (en)
MA (1) MA20709A1 (en)
MX (1) MX168026B (en)
NZ (1) NZ216127A (en)
PT (2) PT82758A (en)
SE (1) SE448331B (en)
TN (1) TNSN86087A1 (en)
TR (1) TR23124A (en)
WO (1) WO1986007497A1 (en)
YU (1) YU47041B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1009818A4 (en) * 1995-08-23 1997-09-02 Huber Signalbau Ag Device for ground elements modular cabinet.
EP0952765A2 (en) * 1998-04-23 1999-10-27 Kathrein-Werke KG Strip for making electrical contact and/or for EMI shielding, and corresponding shielded device
WO2013004774A1 (en) * 2011-07-05 2013-01-10 European Aeronautic Defence And Space Company Eads France Assembled structure having electrical continuity
WO2014067738A1 (en) * 2012-10-31 2014-05-08 A. Raymond Et Cie Device for ensuring an electric connection between two parts to be interconnected
WO2018050395A1 (en) * 2016-09-16 2018-03-22 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Frame for a brake control device of a railbound vehicle

Families Citing this family (7)

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DE19809224A1 (en) * 1998-03-04 1999-09-09 Bosch Siemens Hausgeraete Home appliance
US6444900B1 (en) 1999-05-19 2002-09-03 Fci Americas Technology, Inc. Electromagnetic interference shielding gasket
US6405058B2 (en) * 2000-05-16 2002-06-11 Idigi Labs, Llc Wireless high-speed internet access system allowing multiple radio base stations in close confinement
US6839571B2 (en) 2000-05-19 2005-01-04 Xg Technology, Llc RF shielding design for wireless high-speed internet access system
US6997722B2 (en) * 2003-03-25 2006-02-14 Elma Electronic Inc. ESD system for grounding electronics within an enclosure
CN103928775B (en) * 2014-03-31 2016-10-19 国家电网公司 The substation secondary air switch little ground wire of enclosed type ground connection
DE102018112013A1 (en) * 2018-05-18 2019-11-21 Maschinenfabrik Reinhausen Gmbh CONTACT SYSTEM FOR A LOAD TERMINAL SWITCH

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DE2250639B2 (en) * 1972-10-16 1976-03-18 Siemens AG, 1000 Berlin und 8000 München ELECTROMAGNETIC SEALING OF CONNECTING JOINTS FOR SCREWED SHIELDING ELEMENTS
US4082410A (en) * 1976-05-06 1978-04-04 Amerace Corporation Electrical connectors and contact assemblies therefor
GB2054777B (en) * 1979-07-05 1983-01-26 Lucas Industries Ltd Servo boosters for vehicle braking systems
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US4572921A (en) * 1984-07-30 1986-02-25 Instrument Specialties Co., Inc. Electromagnetic shielding device
DE3445118A1 (en) * 1984-12-11 1986-06-12 Alfred Teves Gmbh, 6000 Frankfurt Vacuum brake booster
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No relevant documents have been disclosed *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1009818A4 (en) * 1995-08-23 1997-09-02 Huber Signalbau Ag Device for ground elements modular cabinet.
DE19530924C2 (en) * 1995-08-23 2001-11-08 Huber Signalbau Ag Device for grounding a modular housing unit
EP0952765A2 (en) * 1998-04-23 1999-10-27 Kathrein-Werke KG Strip for making electrical contact and/or for EMI shielding, and corresponding shielded device
EP0952765A3 (en) * 1998-04-23 2000-07-05 Kathrein-Werke KG Strip for making electrical contact and/or for EMI shielding, and corresponding shielded device
WO2013004774A1 (en) * 2011-07-05 2013-01-10 European Aeronautic Defence And Space Company Eads France Assembled structure having electrical continuity
WO2014067738A1 (en) * 2012-10-31 2014-05-08 A. Raymond Et Cie Device for ensuring an electric connection between two parts to be interconnected
WO2018050395A1 (en) * 2016-09-16 2018-03-22 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Frame for a brake control device of a railbound vehicle

Also Published As

Publication number Publication date
FI75692B (en) 1988-03-31
FI75692C (en) 1988-07-11
IE861538L (en) 1986-12-14
DK163547B (en) 1992-03-09
DK73187A (en) 1987-02-13
DK163547C (en) 1992-07-27
JPS62503135A (en) 1987-12-10
PT8506T (en) 1992-11-30
AU5961186A (en) 1987-01-07
EP0228405B1 (en) 1989-04-26
DE3663099D1 (en) 1989-06-01
TR23124A (en) 1989-04-03
SE8502976L (en) 1986-12-15
EP0228405A1 (en) 1987-07-15
FI870382A (en) 1987-01-29
JP2597561B2 (en) 1997-04-09
DZ939A1 (en) 2004-09-13
SE448331B (en) 1987-02-09
MA20709A1 (en) 1986-12-31
YU98486A (en) 1988-04-30
PT8506U (en) 1995-12-29
KR910004011B1 (en) 1991-06-20
FI870382A0 (en) 1987-01-29
TNSN86087A1 (en) 1990-01-01
PT82758A (en) 1986-07-01
DK73187D0 (en) 1987-02-13
YU47041B (en) 1994-12-28
MX168026B (en) 1993-04-29
US4781603A (en) 1988-11-01
CA1280802C (en) 1991-02-26
NZ216127A (en) 1989-04-26
EG19801A (en) 1996-02-29
IE57363B1 (en) 1992-08-12
KR880700485A (en) 1988-03-15
ES296718U (en) 1987-12-16
SE8502976D0 (en) 1985-06-14
BR8606722A (en) 1987-08-11
GR861358B (en) 1986-05-28
AU590290B2 (en) 1989-11-02
ES296718Y (en) 1988-05-16

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