GB1595831A - Contact body for use in an electric circuit - Google Patents
Contact body for use in an electric circuit Download PDFInfo
- Publication number
- GB1595831A GB1595831A GB3308/78A GB330878A GB1595831A GB 1595831 A GB1595831 A GB 1595831A GB 3308/78 A GB3308/78 A GB 3308/78A GB 330878 A GB330878 A GB 330878A GB 1595831 A GB1595831 A GB 1595831A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contact body
- contact
- body according
- grid
- fibres
- 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
Links
- 238000010276 construction Methods 0.000 claims description 19
- 239000004020 conductor Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 239000004642 Polyimide Substances 0.000 claims description 8
- 229920001721 polyimide Polymers 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000002923 metal particle Substances 0.000 claims description 3
- 239000006061 abrasive grain Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 230000008021 deposition Effects 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- USBWXQYIYZPMMN-UHFFFAOYSA-N rhenium;heptasulfide Chemical compound [S-2].[S-2].[S-2].[S-2].[S-2].[S-2].[S-2].[Re].[Re] USBWXQYIYZPMMN-UHFFFAOYSA-N 0.000 description 1
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
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
- H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof
Landscapes
- Motor Or Generator Current Collectors (AREA)
- Contacts (AREA)
- Manufacture Of Switches (AREA)
- Conductive Materials (AREA)
- Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
Description
(54) CONTACT BODY FOR USE IN AN ELECTRIC CIRCUIT
(71) We, ROBERT BOSCH GmbH, a
German company, of Postfach 50, 7 Stuttgart 1, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The present invention relates to a contact body for use in an electric circuit.
The present invention provides a contact body for use in an electric circuit, the contact body being made of a polyimide and containing means for conducting electric current; wherein the contact body is produced by a sintering of the polyimide; and the means for conducting electric current are in the form of a grid like construction in the contact body. These means may be formed for example. by electrically conducting fibres or by one or more metal wires.
A contact body, used as a brush, is aIready known which consists of carbon and contains esters of aliphatic and inorganic acids to improve its running properties. In the case of a contact body of this kind there is, however, the difficulty of binding in these additives so that they are retained throughout the entire life of the contact body with the result that the positive properties occasioned by these additives progressively disappear.
Furthermore, a contact body is also known which consists substantially of silver and rhenium sulfide. The high price of this contact body. however detracts from its advantageous properties.
The contact body in accordance with the invention has the advantage the it has very good operating properties which stay the same throughout the whole of its life, that it is very cheap to manufacture and that it is subject to negligibly low wear in certain cases of use. Because of the latter. it especially counteracts the creation of creepage current.
The contact body in accordance with the invention is further distinguished by an extraordinarily long life and by smaller dimensions due to the absence of wear.
Embodiments of the invention are shown in the accompanying drawing in which:
Fig. I shows the design of a contact body of the invention in an enlarged diagrammatic representation, partiaIly cut away:
Figs. 2a and 2b are sections through contact bodies of the invention; and
Fig. 3 shows a contact body of the invention attached to a pressing spring of and electrical machine, the body being insertable, for example, as a brush.
The contact body 10 in accordance with
Fig. I is made of a polyimMe. For the purposes of conducting current, however, means generally indicated at 12 are disposed in the contact body. In the erl odiment in accordance with Fig. I these means are formed by a grid-like construction 112 of a conducting material. In order to improve the passage of current, with this arrangement, the poIymide itseIf can furthermore be filled with graphite up to a certain degree. The arrangement of the grid-like co ntstructiou construction 112 in the contact body 10 assists in the practical use of the contact body IO. The grid-like construction 112 can by way of example comprise a metal, preferably silver or copper.
In certain cases of use it is, however, af advantage if the grid-like construction 112 is a web of carbon or graphite fibres or artificial carbon. The arrangement of the grid-like construction, chiefly for use as a siding contact, is done in such a way that at least one end section of the grid-like construction is exposed at a contact free face 14 of the contact body 10 and/or at an opposing face of 16 of the contact body 10. lft is, however, also conceivable that connecting means are attached to the opposing face 16 of the contact body 10, by means of which the contact body can be connected to other components. In accordance with the embodiment of Figure 1, as shown in Fig. 2a, several grid-like constructions 112 are disposed in planes which are parallel to one another in the contact body 10.
An improvement in the strength of the contact body IO can lie achieved if in accordance with an embodiment shown in
Fig. 2b the grid-like constructions are disposed in intersecting planes.
In the embodiments as shown in Figs. 2a and 2b the means 112 for conducting the electric current are disposed in a uniform distribution in the contact body.
The insertion of the means 12 into the contact body 10 is preferably carried out at the stage of the process at which the contact body 10 is itself manufactured. The process is by a sintering of the raw material. It is, however, conceivable that the contact body 10 also undergo vapour deposition with an electrically conducting material so that the electric conductor penetrates to some extent the surface region of the contact body 10 and thus the contact body 10 possesses on its surface very good conductivity.
Particularly in the use of the contact body as a brush for an electric machine it can be of advantage if the contact body, at least in the region of its contact surface abutting the machine collector, is provided with abrasive means which can be formed by way of example by mineral or metallic abrasive grains or by glass fibres. This enables the machine collector which co-operates with the contact body to be kept clean so that a good passage of current is always ensured.
In addition to the above-mentioned examples of the applications of the contact body in accordance with the invention, it is also especially suited for use as a contact breaker in the ignition system of an internal combustion engine. Particularly in this application, the carrier for the contact body can also comprise polyimide, whereby certain sections of the carrier are kept free of the electrically conducting means. These regions of the carrier could then be used for the insulated attachment of the carrier to other components. As Fig. 3 shows, it is, however, also conceivable to attach the contact body 10 to an electric conductor 30 which serves as a supporting body. For this purpose an electrically conducting adhesive is preferably used.
In addition to the individual production of the contact bodies already mentioned, they may be produced several at a time by being cut out of a single blank.
The substantial advangages of the contact body in accordance with the invention are that it can be manufactured very cheaply, and that it has an extraordinarily compact dimensions and an extraordinarily long life.
In certain cases of use, a further advantage of the contact body in accordance with the invention is the fact that it is subject to a negligibly low wear. This prevents the formation of creepage currents. which in the case of known brushes are unavoidable in the region of the dust formed from the wear.
Finally, the contact body in accordance with the invention has the further advantage that only small quantities of expensive contact metals are required in its production.
The contact resistance of the contact body in accordance with the invention can be influenced by the thickness of the conducting material in the contact body. It is also worthwhile to bear in mind that discrete metal particles and graphite fibres may be used along with the different grid arrangements.
WHAT WE CLAIM IS:-
1. A contact body for use in an electric circuit, the contact body being made of a polyimide and containing means for conducting electric current; wherein the contact body is produced by a sintering or the polyimide, and the means for conducting electric current are in the form of a grid-like construction in the contact body.
2. A contact body according to claim 1, wherein said grid-like construction is made up of fibres of an electrically conducting material.
3. A contact body according to claim 2, wherein the fibres are graphite fibres.
4. A contact body according to claim 1, wherein said grid-like construction is made up of metal wires.
5. A contact body according to claim 4, wherein each wire consists of silver or copper.
6. A contact body according to any of claims I to 5, wherein at least one part of said means is exposed at its ends at a contact face or there and at an opposing face of the contact body.
7. A contact body according to any of claims 1 to 6, wherein several grid-like constructions are disposed in planes which are parallel to one another in the contact body.
8. A contact body according to any of claims 1 to 6, wherein several grid-like constructions are disposed in intersecting planes in the contact body.
9. A contact body according to any of the preceding claims, and intended for use as a sliding contact with the collector of an electric machine, wherein it is provided with an abrasive means in the region of its contact face with the collector.
10. A contact body according to claim 15, wherein the abrasive means are formed by glass fibres.
II. A contact body according to any of the preceding claims, wherein the contact body is produced individually.
12. A contact body according to any of the preceding claims 1 to 10, wherein the contact body is produced in plurality from a blank.
13. A contact body according to any of the preceding claims wherein the contact body is attached to an electric conductor by means of an electrically conducting adhesive.
14. A contact body according to any of the preceding claims, wherein the body
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (15)
1. A contact body for use in an electric circuit, the contact body being made of a polyimide and containing means for conducting electric current; wherein the contact body is produced by a sintering or the polyimide, and the means for conducting electric current are in the form of a grid-like construction in the contact body.
2. A contact body according to claim 1, wherein said grid-like construction is made up of fibres of an electrically conducting material.
3. A contact body according to claim 2, wherein the fibres are graphite fibres.
4. A contact body according to claim 1, wherein said grid-like construction is made up of metal wires.
5. A contact body according to claim 4, wherein each wire consists of silver or copper.
6. A contact body according to any of claims I to 5, wherein at least one part of said means is exposed at its ends at a contact face or there and at an opposing face of the contact body.
7. A contact body according to any of claims 1 to 6, wherein several grid-like constructions are disposed in planes which are parallel to one another in the contact body.
8. A contact body according to any of claims 1 to 6, wherein several grid-like constructions are disposed in intersecting planes in the contact body.
9. A contact body according to any of the preceding claims, and intended for use as a sliding contact with the collector of an electric machine, wherein it is provided with an abrasive means in the region of its contact face with the collector.
10. A contact body according to claim 15, wherein the abrasive means are formed by glass fibres.
II. A contact body according to any of the preceding claims, wherein the contact body is produced individually.
12. A contact body according to any of the preceding claims 1 to 10, wherein the contact body is produced in plurality from a blank.
13. A contact body according to any of the preceding claims wherein the contact body is attached to an electric conductor by means of an electrically conducting adhesive.
14. A contact body according to any of the preceding claims, wherein the body
additionally contains discrete metal particles and/or graphite fibres.
15. A contact body for use in an electrical circuit substantially as hereinbefore described with reference to Fig. 1 and Fig. 2a or to Fig. 2b or to Fig. 3 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772703759 DE2703759A1 (en) | 1977-01-29 | 1977-01-29 | CONTACT BODY FOR USE IN AN ELECTRICAL CIRCUIT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1595831A true GB1595831A (en) | 1981-08-19 |
Family
ID=5999907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3308/78A Expired GB1595831A (en) | 1977-01-29 | 1978-01-27 | Contact body for use in an electric circuit |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5396472A (en) |
| AU (1) | AU510691B2 (en) |
| DD (1) | DD136079A5 (en) |
| DE (1) | DE2703759A1 (en) |
| FR (1) | FR2379180A1 (en) |
| GB (1) | GB1595831A (en) |
| IT (1) | IT1091824B (en) |
| SE (1) | SE433893B (en) |
| SU (1) | SU882429A3 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS568081U (en) * | 1979-06-29 | 1981-01-23 | ||
| US4337407A (en) * | 1980-04-29 | 1982-06-29 | Westinghouse Electric Corp. | Insulated strand brushes |
| CA1233210A (en) * | 1981-12-17 | 1988-02-23 | Howard L. Jacobs | Rip detecting antenna |
| US4518648A (en) * | 1983-03-10 | 1985-05-21 | Alps Electric Co., Ltd. | Sheet material and production method thereof |
| JPS60109112A (en) * | 1983-11-17 | 1985-06-14 | 日立化成工業株式会社 | Contactor |
| JP3087294B2 (en) * | 1989-09-29 | 2000-09-11 | ジェイエスアール株式会社 | Method for producing anisotropic conductive sheet |
| US5387832A (en) * | 1991-04-25 | 1995-02-07 | Tokyo Electric Co., Ltd. | Brush and commutator motor having brush device using the same |
| DE19929686A1 (en) * | 1999-06-28 | 2001-01-25 | Christian Felber | Brush ring for electric motor e.g. for machine tools, has current-conducting contact element consisting of fine, current-conducting fibres, preferably carbon fibres, fixed in current-conducting bearer element |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1507566A (en) * | 1920-09-27 | 1924-09-09 | Vincent G Apple | Commutator brush and method of making it |
| US1703191A (en) * | 1925-04-14 | 1929-02-26 | Delcoremy Corp | Dynamo brush |
| US2019065A (en) * | 1934-01-31 | 1935-10-29 | Darroch Gourley | Dynamo electric machine commutator brush with integral shunt |
| FR897936A (en) * | 1942-09-15 | 1945-04-05 | Process for making a durable, electrically conductive junction of porous conductors, in particular of carbon, either with each other or with metallic conductors | |
| GB1421534A (en) * | 1972-03-30 | 1976-01-21 | Nat Res Dev | Electrical brushes |
| DE2316796A1 (en) * | 1973-04-04 | 1974-10-17 | Carbone Ag | COAL BRUSH |
-
1977
- 1977-01-29 DE DE19772703759 patent/DE2703759A1/en not_active Ceased
-
1978
- 1978-01-10 AU AU32312/78A patent/AU510691B2/en not_active Expired
- 1978-01-26 SE SE7800965A patent/SE433893B/en unknown
- 1978-01-27 IT IT19749/78A patent/IT1091824B/en active
- 1978-01-27 JP JP822678A patent/JPS5396472A/en active Pending
- 1978-01-27 DD DD78203453A patent/DD136079A5/en unknown
- 1978-01-27 SU SU782571846A patent/SU882429A3/en active
- 1978-01-27 GB GB3308/78A patent/GB1595831A/en not_active Expired
- 1978-01-30 FR FR7802558A patent/FR2379180A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DD136079A5 (en) | 1979-06-13 |
| IT1091824B (en) | 1985-07-06 |
| IT7819749A0 (en) | 1978-01-27 |
| SE7800965L (en) | 1978-07-30 |
| SE433893B (en) | 1984-06-18 |
| JPS5396472A (en) | 1978-08-23 |
| FR2379180A1 (en) | 1978-08-25 |
| SU882429A3 (en) | 1981-11-15 |
| DE2703759A1 (en) | 1978-08-03 |
| AU3231278A (en) | 1979-07-19 |
| FR2379180B1 (en) | 1983-06-24 |
| AU510691B2 (en) | 1980-07-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |