EP0649187B1 - Moulded article with electrical contact - Google Patents
Moulded article with electrical contact Download PDFInfo
- Publication number
- EP0649187B1 EP0649187B1 EP94115755A EP94115755A EP0649187B1 EP 0649187 B1 EP0649187 B1 EP 0649187B1 EP 94115755 A EP94115755 A EP 94115755A EP 94115755 A EP94115755 A EP 94115755A EP 0649187 B1 EP0649187 B1 EP 0649187B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- molding
- metal
- prongs
- metal covering
- cornered
- 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 - Lifetime
Links
Images
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
- H01R4/26—Connections in which at least one of the connecting parts has projections which bite into or engage the other connecting part in order to improve the contact
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
Definitions
- the invention relates to a molded body made of a metal fiber reinforced Thermoplastic material that has at least one electrical contact. (e.g. grounding).
- Thermoplastic materials that are filled with metal fibers are used, among other things, for heating elements (surface heating conductors), shielding housings and antistatic components.
- the conductive metal fibers do not reach the surface directly.
- the less conductive layer that forms on the surface and is depleted of metal fibers makes it difficult to attach electrical contacts. This problem does not occur on surfaces created by sawing.
- the electrical contacts are therefore made by drilling the moldings and then pressing in metal bushings or metal pins or by screwing in self-tapping metal screws.
- a molded body according to claim 1 has now been found. Drilling beforehand is not necessary.
- the prongs preferably form isosceles triangles. If the bodies made of thermoplastic material are in the form of a plate, the metal coating should preferably be clipped at two opposite locations on the plate. The prongs are preferably arranged offset in the 2 opposite legs of the clip. If the shaped body is cylindrical, the metal coating can have the shape of a pipe clamp which encloses the circumference of the cylinder.
- the moldings to be provided with contacts can be, for example, housing parts and other injection molded parts, such as handles, wheels or buttons. The electrical contacts make it possible to heat these parts electrically.
- Figure 1 shows a one-piece clip (1) with prefabricated bending edges (2) and staggered triangular prongs (3) which drill through the less conductive (outer) layers into the interior of a plate (6) when the metal clip is pressed together.
- the distance d corresponds to the thickness of the plate (6) to which the metal clip is to be applied.
- Figure 2 shows the section through a plate-shaped body (6) of thickness d on the edge of which the metal clip (1) is fastened with the prongs 3 along the section line II-II of Figure 1.
- Figure 3 shows a metal clip (4) in the form of a hose clamp with triangular prongs (3) and a tensioning device (5). When (5) is closed, the prongs 3 drill into the surface of a cylindrical molded body made of thermoplastic material (not shown).
- the tines can be replaced very advantageously because of inexpensive metal shavings are sprinkled on the surface at the contact point, and like the prongs when closing the metal clamp or pipe clamp Penetrate the surface.
- the metal chips are preferably made of brass or Stainless steel. Their dimensions should be so large that the non-conductive Surface of the molded body is penetrated. Preferably 1 to 3 mm large metal shavings sprinkled on the molded body and pressed. A Warming the surface makes it easier for the teeth to penetrate or chips.
- the content of metal fibers in the thermoplastic material is preferably less than 20% by weight, in particular 5 to 10% by weight.
- the molded body can be reinforced with glass fiber to increase the mechanical strength. Adding carbon black can slightly increase the electrical conductivity.
- Steel fibers, in particular stainless steel fibers, are preferably used as metal fibers.
- the metal fibers preferably have a length of 1 to 20 mm and a thickness of 5 to 15 ⁇ m.
- the thermoplastic material is preferably selected from the group of amorphous thermoplastics, such as polycarbonate and acrylonitrile / butadiene / styrene copolymers, PC / ABS blends or partially crystalline thermoplastics such as polypropylene, polyamide 66, polybutylene terephthalate or polyphenylene sulfide.
- amorphous thermoplastics such as polycarbonate and acrylonitrile / butadiene / styrene copolymers, PC / ABS blends or partially crystalline thermoplastics such as polypropylene, polyamide 66, polybutylene terephthalate or polyphenylene sulfide.
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Switches With Compound Operations (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Description
Die Erfindung betrifft einen Formkörper aus einem metallfaserverstärkten Thermoplastmaterial, der mindestens einen elektrischen Kontakt aufweist. (z.B. Erdung).The invention relates to a molded body made of a metal fiber reinforced Thermoplastic material that has at least one electrical contact. (e.g. grounding).
Thermoplastwerkstoffe, die mit Metallfasern gefüllt sind, werden unter anderem
für Heizelemente (Flächenheizleiter), abschirmende Gehäuse und antistatisch
ausgerüstete Bauteile verwendet. Bei der Herstellung solcher Formkörper durch
Spritzgießen oder durch Extrusion gelangen die leitfähigen Metallfasern nicht
unmittelbar an die Oberfläche. Die sich an der Oberfläche ausbildende an
Metallfasern verarmte, weniger leitfähige Schicht erschwert die Anbringung von
elektrischen Kontakten. An Oberflächen, die durch Sägen erzeugt wurden, tritt
dieses Problem nicht auf.
Üblicherweise werden deshalb die elektrischen Kontakte durch Bohren der
Formkörper und nachfolgendes Einpressen von Metallbuchsen oder Metallstiften
oder durch Eindrehen von selbstschneidenden Metallschrauben angebracht.
Diese bekannte Methoden der Anbringung von Kontakten sind arbeits- und
materialaufwendig, insbesondere wenn größere Kontaktflächen erforderlich sind.
Es bestand daher die Aufgabe, einen leicht herstellbaren elektrisch leitfähigen
Formkörper mit elektrischen Kontakten zu schaffen.Thermoplastic materials that are filled with metal fibers are used, among other things, for heating elements (surface heating conductors), shielding housings and antistatic components. When such molded articles are produced by injection molding or extrusion, the conductive metal fibers do not reach the surface directly. The less conductive layer that forms on the surface and is depleted of metal fibers makes it difficult to attach electrical contacts. This problem does not occur on surfaces created by sawing.
Usually, the electrical contacts are therefore made by drilling the moldings and then pressing in metal bushings or metal pins or by screwing in self-tapping metal screws. These known methods of attaching contacts are labor and material intensive, especially when larger contact areas are required. It was therefore the task of creating an easily producible electrically conductive molded body with electrical contacts.
Es wurde nun ein Formkörper gemäß Anspruch 1
gefunden.
Ein vorheriges Bohren ist nicht erforderlich.
Vorzugsweise bilden die Zacken gleichschenklige Dreiecke.
Falls die Körper aus thermoplastischen Material die Form einer Platte aufweisen,
so soll vorzugsweise die Metallbeschichtung an 2 gegenüberliegenden Stellen
der Platte verklammert sein. Vorzugsweise sind die Zacken in den 2
gegenüberliegenden Schenkeln der Klammer versetzt angeordnet.
Falls der Formkörper zylinderförmig ist, so kann die Metallbeschichtung die Form
einer Rohrschelle aufweisen, die den Zylinderumfang umschließt.
Die mit Kontakten zu versehenden Formkörper können beispielsweise
Gehäuseteile und andere Spritzguß-Formteile, wie Griffe, Räder oder Tasten
sein. Die elektrischen Kontakte ermöglichen es, diese Teile elektrisch zu
beheizen.
Figur 1 zeigt eine einstückige Klammer (1) mit vorgefertigten Biegekanten (2)
und versetzt angeordneten dreieckigen Zacken (3), die sich beim
Zusammenpressen der Metallklammer durch die weniger leitfähigen (äußeren)
Schichten ins Innere einer Platte (6) bohren. Die Strecke d entspricht der Dicke
der Platte (6) an die die Metallklammer appliziert werden soll. Figur 2 zeigt den
Schnitt durch einen plattenförmigen Formkörper (6) der Dicke d an dessen Kante
die Metallklammer (1) mit den Zacken 3 befestigt ist entlang der Schnittlinie II-II
von Figur 1.
Figur 3 zeigt eine Metallklammer (4) in Form einer Schlauchschelle mit
dreieckigen Zacken (3) und einer Spannvorrichtung (5). Beim Zuziehen von (5)
bohren sich die Zacken 3 in die Oberfläche eines zylinderförmigen Formkörpers
aus thermoplastischen Material (nicht dargestellt).A molded body according to
If the bodies made of thermoplastic material are in the form of a plate, the metal coating should preferably be clipped at two opposite locations on the plate. The prongs are preferably arranged offset in the 2 opposite legs of the clip.
If the shaped body is cylindrical, the metal coating can have the shape of a pipe clamp which encloses the circumference of the cylinder.
The moldings to be provided with contacts can be, for example, housing parts and other injection molded parts, such as handles, wheels or buttons. The electrical contacts make it possible to heat these parts electrically.
Figure 1 shows a one-piece clip (1) with prefabricated bending edges (2) and staggered triangular prongs (3) which drill through the less conductive (outer) layers into the interior of a plate (6) when the metal clip is pressed together. The distance d corresponds to the thickness of the plate (6) to which the metal clip is to be applied. Figure 2 shows the section through a plate-shaped body (6) of thickness d on the edge of which the metal clip (1) is fastened with the
Figure 3 shows a metal clip (4) in the form of a hose clamp with triangular prongs (3) and a tensioning device (5). When (5) is closed, the
Die Zacken können sehr vorteilhaft, da kostengünstig, durch Metallspäne ersetzt werden, die an der Kontaktstelle auf die Oberfläche aufgestreut werden, und wie die Zacken beim Schließen der Metallklammer oder Rohrschelle die Oberfläche durchdringen. Die Metallspäne sind vorzugsweise aus Messing oder Edelstahl. Ihre Abmessungen sollen so groß sein, daß die nichtleitende Oberfläche der Formkörper durchdrungen wird. Vorzugsweise werden 1 bis 3 mm große Metallspäne auf den Formkörper aufgestreut und eingepreßt. Ein Erwärmen der Oberfläche erleichtert in allen Fällen das Eindringen der Zacken oder Späne. The tines can be replaced very advantageously because of inexpensive metal shavings are sprinkled on the surface at the contact point, and like the prongs when closing the metal clamp or pipe clamp Penetrate the surface. The metal chips are preferably made of brass or Stainless steel. Their dimensions should be so large that the non-conductive Surface of the molded body is penetrated. Preferably 1 to 3 mm large metal shavings sprinkled on the molded body and pressed. A Warming the surface makes it easier for the teeth to penetrate or chips.
Der Gehalt des thermoplastischen Material an Metallfasern beträgt vorzugsweise
weniger als 20 Gew.-%, insbesondere 5 bis 10 Gew.-%. Darüberhinaus kann
der Formkörper zur Erhöhung der mechanischen Festigkeit durch Glasfaser
verstärkt sein. Ein Zusatz an Ruß kann die elektrische Leitfähigkeit etwas
erhöhen.
Vorzugsweise werden als Metallfasern Stahlfasern, insbesondere
Edelstahlfasern, verwendet. Die Metallfasern besitzen vorzugsweise eine Länge
von 1 bis 20 mm und eine Dicke von 5 bis 15 µm. Das thermoplastische
Material wird vorzugsweise ausgewählt aus der Gruppe von amorphen
Thermoplasten, wie Polycarbonat und Acrylnitril/Butadien/Styrol-Copolymerisaten,
PC/ABS-Blends oder teilkristallinen Thermoplasten wie
Polypropylen, Polyamid 66, Polybutylenterephthalat oder Polyphenylensulfid.The content of metal fibers in the thermoplastic material is preferably less than 20% by weight, in particular 5 to 10% by weight. In addition, the molded body can be reinforced with glass fiber to increase the mechanical strength. Adding carbon black can slightly increase the electrical conductivity.
Steel fibers, in particular stainless steel fibers, are preferably used as metal fibers. The metal fibers preferably have a length of 1 to 20 mm and a thickness of 5 to 15 µm. The thermoplastic material is preferably selected from the group of amorphous thermoplastics, such as polycarbonate and acrylonitrile / butadiene / styrene copolymers, PC / ABS blends or partially crystalline thermoplastics such as polypropylene, polyamide 66, polybutylene terephthalate or polyphenylene sulfide.
Claims (7)
- A molding of a thermoplastic material reinforced with metal fibers, with at least one electric contact, wherein the contacts comprise a metal covering which is connected to the molding by three-cornered prongs (3), the prongs (3) penetrating the less conductive layer on the surface of the molding.
- The molding as claimed in claim 1, wherein the prongs (3) have the form of isosceles triangles.
- The molding as claimed in claim 1, wherein, instead of by three-cornered prongs (3), the metal covering is connected to the molding by means of metal chips which penetrate the surface.
- The molding as claimed in any one of claims 1 to 3, wherein the molding has the form of a board and the metal covering is clamped on both sides of the board.
- The molding as claimed in claim 4, wherein the three-cornered prongs (3) of the metal covering are arranged offset on both sides of the molding (6) in board form.
- The molding as claimed in claims 1 to 3, wherein the molding is cylindrical and the metal covering has the form of a pipe clip.
- The molding as claimed in any one of claims 1-6, wherein the penetration of the prongs (3) or metal chips is facilitated by heating the surface or penetration into the surface which is still warm from processing.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9315490U DE9315490U1 (en) | 1993-10-13 | 1993-10-13 | Molded body with electrical contact |
DE9315490U | 1993-10-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0649187A1 EP0649187A1 (en) | 1995-04-19 |
EP0649187B1 true EP0649187B1 (en) | 1999-01-07 |
Family
ID=6899275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94115755A Expired - Lifetime EP0649187B1 (en) | 1993-10-13 | 1994-10-06 | Moulded article with electrical contact |
Country Status (4)
Country | Link |
---|---|
US (1) | US5692922A (en) |
EP (1) | EP0649187B1 (en) |
JP (1) | JPH07164574A (en) |
DE (2) | DE9315490U1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3060116B2 (en) * | 1995-09-04 | 2000-07-10 | 中洲電機株式会社 | Members and tools used for electrical connection and for obtaining electrical conductivity |
US9808249B2 (en) | 2013-08-23 | 2017-11-07 | Ethicon Llc | Attachment portions for surgical instrument assemblies |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1665548A1 (en) * | 1951-01-28 | 1971-03-25 | Siemens Ag | Clamp connection for the electrical connection of a cable shield |
US3305623A (en) * | 1964-10-19 | 1967-02-21 | Metex Corp | Shielded window construction |
US3504101A (en) * | 1968-09-30 | 1970-03-31 | Amp Inc | Electric connector for aluminum foil |
US3715705A (en) * | 1971-03-29 | 1973-02-06 | Thomas & Betts Corp | Multicompartment connector |
BE794320A (en) * | 1972-01-19 | 1973-07-19 | Thomas & Betts Corp | INSULATION AND OXIDE DRILLING CONTACT MEANS |
US3818415A (en) * | 1973-02-16 | 1974-06-18 | Amp Inc | Electrical connections to conductors having thin film insulation |
GB1437721A (en) * | 1973-06-21 | 1976-06-03 | Cannon Electric Great Britain | Electrical termination arrangements for flat cables |
US3846577A (en) * | 1973-07-10 | 1974-11-05 | Thomas & Betts Corp | Electrical splice |
DE2911575C2 (en) * | 1979-03-23 | 1982-11-04 | Eternit Ag, 1000 Berlin | Tensile pipe coupling |
US4248493A (en) * | 1979-05-25 | 1981-02-03 | Thomas & Betts Corporation | Self-locking clamp member |
US4558915A (en) * | 1980-02-21 | 1985-12-17 | Thomas & Betts Corporation | Electrical connector |
US4412255A (en) * | 1981-02-23 | 1983-10-25 | Optical Coating Laboratory, Inc. | Transparent electromagnetic shield and method of manufacturing |
JPS5957866U (en) * | 1982-10-08 | 1984-04-16 | 松下電工株式会社 | Structure of flat cable connection |
US4820170A (en) * | 1984-12-20 | 1989-04-11 | Amp Incorporated | Layered elastomeric connector and process for its manufacture |
FR2638026B1 (en) * | 1988-10-18 | 1990-12-21 | Mecatraction | CONNECTION OF A CABLE TO A LAMINATED PANEL ELECTRODE, IN PARTICULAR A HEATING PANEL, BY STAPED TERMINAL, TERMINAL FOR SUCH A JOINT AND A BAR MADE OF A MULTIPLICITY OF LINKED TERMINALS |
JPH0291360U (en) * | 1988-12-29 | 1990-07-19 | ||
US5174766A (en) * | 1990-05-11 | 1992-12-29 | Canon Kabushiki Kaisha | Electrical connecting member and electric circuit member |
US5140405A (en) * | 1990-08-30 | 1992-08-18 | Micron Technology, Inc. | Semiconductor assembly utilizing elastomeric single axis conductive interconnect |
US5101553A (en) * | 1991-04-29 | 1992-04-07 | Microelectronics And Computer Technology Corporation | Method of making a metal-on-elastomer pressure contact connector |
US5211567A (en) * | 1991-07-02 | 1993-05-18 | Cray Research, Inc. | Metallized connector block |
-
1993
- 1993-10-13 DE DE9315490U patent/DE9315490U1/en not_active Expired - Lifetime
-
1994
- 1994-10-06 EP EP94115755A patent/EP0649187B1/en not_active Expired - Lifetime
- 1994-10-06 DE DE59407592T patent/DE59407592D1/en not_active Expired - Fee Related
- 1994-10-11 US US08/321,109 patent/US5692922A/en not_active Expired - Fee Related
- 1994-10-13 JP JP6247652A patent/JPH07164574A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0649187A1 (en) | 1995-04-19 |
DE59407592D1 (en) | 1999-02-18 |
JPH07164574A (en) | 1995-06-27 |
DE9315490U1 (en) | 1994-11-10 |
US5692922A (en) | 1997-12-02 |
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