Claims
- 1. In a contact arrangement for a switch having two coaxially arranged and generally cylindrical contacts having respectively closed leading surfaces covered by contact overlays, the improvement comprising one of the contacts having a coaxial core of ferromagnetic material; and a current-carrying envelope surrounding the core, at least a portion of which is in the form of a helix.
- 2. An improvement as defined in claim 1, wherein the helix is defined by grooves whose depth is less than the radial thickness of the envelope.
- 3. An improvement as defined in claim 1, wherein the envelope comprises rods twisted in helical fashion.
- 4. An improvement as defined in claim 1, further comprising helical, electrically poorly conducting inserts located within the envelope.
- 5. An improvement as defined in any of claims 1-4, wherein the core comprises a shaped body provided with helical ribs running axially of the contact.
- 6. An improvement as defined in any of claims 1-4, wherein the core comprises a shaped body provided with helical laminae running axially of the contact.
- 7. An improvement as defined in any of claims 1-4, further comprising the other of the contacts having the same configuration as the one of the contacts, with the helixes of the two contacts running in the same direction.
- 8. A generally cylindrical contact having a closed leading surface covered by a contact overlay, for use in a switch having two coaxially arranged contacts, comprising an axial core of ferromagnetic material; and a current-carrying envelope surrounding the core, at least a portion of which is in the form of a helix, whereby a current flowing in the envelope will have a radial component for establishing a magnetic field which runs axially of the contact.
- 9. A contact as defined in claim 8, wherein the contact further comprises a leading contact-making surface having a generally ellipsoid shape, whereby the magnetic field set up by a current flowing in the envelope will be generally normal at all points of the contact-making surface.
- 10. A contact arrangement for a switch comprising two coaxially arranged generally cylindrical contacts, each of which has a coaxial core of ferromagnetic material and a current-carrying envelope surrounding the core, at least a portion of which is in the form of a helix; the helixes of the two contacts running in the same direction; whereby a current flowing in the envelopes of the two contacts will establish a magnetic field which runs axially of the contacts and reinforces the closure of the contacts when the switch is in its closed position.
- 11. An improvement as defined in claim 1, further comprising the other of the contact being a substantially flat contact, comprising a leading contact-making surface having a substantially flat shape.
- 12. An improvement as defined in claim 10, wherein both contacts have substantially flat contact surfaces, said flat contact surfaces being substantially parallel to one another.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3112009 |
Mar 1981 |
DEX |
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CROSS REFERENCE
This application is a continuation-in-part of my U.S. patent application, Ser. No. 351,860, entitled CONTACT ARRANGEMENT FOR A SWITCH, which was filed on Feb. 24, 1982.
US Referenced Citations (4)
Foreign Referenced Citations (3)
Number |
Date |
Country |
1266130 |
May 1961 |
FRX |
46-16851 |
May 1971 |
JPX |
147768 |
Nov 1954 |
CHX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
351860 |
Feb 1982 |
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