EP0415969A1 - Contact bolt for switches, switching relays and the like - Google Patents
Contact bolt for switches, switching relays and the likeInfo
- Publication number
- EP0415969A1 EP0415969A1 EP19890905674 EP89905674A EP0415969A1 EP 0415969 A1 EP0415969 A1 EP 0415969A1 EP 19890905674 EP19890905674 EP 19890905674 EP 89905674 A EP89905674 A EP 89905674A EP 0415969 A1 EP0415969 A1 EP 0415969A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact
- bolt
- bead
- head
- contact bolt
- 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.)
- Withdrawn
Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 239000011324 bead Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 239000007858 starting material Substances 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- MGRWKWACZDFZJT-UHFFFAOYSA-N molybdenum tungsten Chemical compound [Mo].[W] MGRWKWACZDFZJT-UHFFFAOYSA-N 0.000 description 1
- MOWMLACGTDMJRV-UHFFFAOYSA-N nickel tungsten Chemical compound [Ni].[W] MOWMLACGTDMJRV-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
Definitions
- the invention relates to a contact bolt of the type set forth in the preamble of claim 1.
- a contact bolt of this type which is known for example from DE-OS 3,632,469, must fulfill a triple function: firstly, it must ensure the current supply through the housing, secondl it must form in the interior of the housing a contact sur ⁇ face for the cooperation with a movable switch contact and thirdly at the outside of the housing it must serve as con- tacting and securing point for connection of the current connection cables.
- contact bolts are subjected to very high electrical, thermal and mechanical stresses.
- very high currents occur, typically of 200 to 2000 amps.
- Failure of the con ⁇ tacting, for example by contact burn-up renders the switch and the starter motor inoperative. Even worse is a welding or fusing of the contacts.
- the starter motor is not switched off after the internal-combustion engine has started, the switching relay remaining in engagement, and this leads in extremely short time to complete destruct ⁇ ion of the starter motor.
- To match the high currents correspondingly largely dimensioned and heavy cables must lead to the starter motor to keep the voltage drop and heat losses as low as possible. Due to the mechanical connection of these heavy cables, coupled with the vibrations of the engine, the contact bolt is also sub ⁇ jected to high mechanical stresses.
- the bolt consists of copper. This has the advantage that the voltage drop both in the bolt and in the switch contact is small and that due to the good thermal conductivity of copper the heat dissipation through the bolt out of the switch is very good.
- the bolt In the second type the bolt consists of steel. It is dis ⁇ tinguished by very high mechanical strength so that the danger of breakage is reduced. Since steel has poor contact properties, at the switch contact point, i.e. in the head of the contact bolt, a contact bead of copper is inserted. In this type failure due to breakage of the contact bolt is practically completely eliminated. However, due to the high resistance of the steel bolt, the transition resist ⁇ ance from the contact bead to the bolt and the poor thermal conductivity of the steel bolt very high temperatures occur in the region of the switch contact. As a result the danger of contact fusing or welding is very great. Admittedly, this danger can be reduced by replacing the contact bead of copper by one of a relatively weld-resistant contact ater- ial. The high temperatures however are not reduced by this step and as a result contact burn-up and the tendency to welding remain troublesome.
- DE-PS 631,839, 898,498 and 926,745 each disclose contact pins for electrical contacts which consist of a sheath of base mat and a core arranged in a longitudinal bore of the sheath and consisting of a material of high electrical conductivity, for example copper or noble metal.
- the sheath serves to mechanically strengthen the contact pin and may consist for example of steel.
- the core may have a widening at the head of the contact pin and form the contact surface. Although this increases the strength with simultaneous good electrical conductivity of the contact pin, it does not however solve the problem of contact burn-off at the contact surface.
- the invention is based on the problem of providing a contact bolt or pin of the aforementioned type which is simple and economical to make and which is distinguished by high contact loadability of the contact surface with simultaneous good thermal conductivity and high mechanical loadability.
- the solution of the problem characterized in the claim has the advantage that the contact pin according to the in ⁇ vention consists of three different materialswhich with regard to the various functions of the contacting at the contact surface, the good electrical thermal conductivity and the good mechanical loadability can be specifically selected independently of each other and the core of material of good conductivity additionally performing the function of a connecting element holding the parts together.
- the contact pin or bolt 3 consists of a threaded shank 4 and the for example hexagonal head 5 which are integrally formed and are made from steel or a similar material with high mechanical strength. Extending in a central bore of the contact bolt 3 is a core 6 of a material with high electrical and thermal conductivity, pre- ferably copper.
- a contact bead 8 is placed on the head 5 of the steel bolt 3.
- the core 6 of copper or the like extends through bores of the steel bolt 3 and the contact bead 8 and after in- sertion is upset at both ends so that the steel bolt 3 and the contact bead 8 are thereby riveted together and mechanic ⁇ ally joined.
- the upsetting operation leads to the copper core 6 completely filling the bore of the steel bolt and the contact bead 8.
- an intimate mechanical and electrical contact of the copper core 6 with the steel bolt 3 and the contact bead 8 is established and consequently the thermal conduct ⁇ ivity of the contact bolt as a whole is improved and in particular excellent heat dissipation from the contact area is ensured.
- the contact bead 8 consists. of a contact material which is resistant to burn-up and welding or fusion, in particular in the form of suitable metal alloys such as copper-nickel, copper-graphite, tungsten-molybdenum or tungsten-nickel alloys.
- the contact bead 8 can in particular be made by powder metallurgy techniques.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Contacts (AREA)
- Manufacture Of Switches (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19883817744 DE3817744C1 (enrdf_load_stackoverflow) | 1988-05-25 | 1988-05-25 | |
| DE3817744 | 1988-05-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0415969A1 true EP0415969A1 (en) | 1991-03-13 |
Family
ID=6355079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19890905674 Withdrawn EP0415969A1 (en) | 1988-05-25 | 1989-05-18 | Contact bolt for switches, switching relays and the like |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0415969A1 (enrdf_load_stackoverflow) |
| JP (1) | JPH03504425A (enrdf_load_stackoverflow) |
| DE (1) | DE3817744C1 (enrdf_load_stackoverflow) |
| WO (1) | WO1989011725A1 (enrdf_load_stackoverflow) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836048A (zh) * | 2014-03-13 | 2014-06-04 | 常熟市平冶机械有限公司 | 一种导电螺栓 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE631839C (de) * | 1931-04-10 | 1936-06-27 | Aeg | Schnell bewegter Kontaktstift fuer elektrische Leistungsschalter |
| DE898498C (de) * | 1943-03-04 | 1953-11-30 | Siemens Ag | Kontaktniet |
| US2739370A (en) * | 1952-03-28 | 1956-03-27 | Metals & Controls Corp | Method of making electrical contacts |
| DE2621748A1 (de) * | 1976-05-15 | 1977-11-24 | Duerrwaechter E Dr Doduco | Verfahren zur herstellung eines bimetall-kontaktniets |
| IT1206706B (it) * | 1984-06-15 | 1989-04-27 | Eaton Controls Spa | Procedimento e utensile per realizzare elementi lamellari conestremita' ingrossata, in particolare lamelle di contatto esimili. |
| DE3632469A1 (de) * | 1986-09-24 | 1988-03-31 | Bosch Gmbh Robert | Elektromagnetischer schalter, insbesondere fuer andrehvorrichtungen von brennkraftmaschinen |
-
1988
- 1988-05-25 DE DE19883817744 patent/DE3817744C1/de not_active Expired
-
1989
- 1989-05-18 WO PCT/EP1989/000546 patent/WO1989011725A1/en not_active Application Discontinuation
- 1989-05-18 JP JP1505479A patent/JPH03504425A/ja active Pending
- 1989-05-18 EP EP19890905674 patent/EP0415969A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8911725A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1989011725A1 (en) | 1989-11-30 |
| JPH03504425A (ja) | 1991-09-26 |
| DE3817744C1 (enrdf_load_stackoverflow) | 1989-11-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19901126 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
| 17Q | First examination report despatched |
Effective date: 19920929 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19930505 |