US3592996A - Method of securing an electrical contact to a support - Google Patents

Method of securing an electrical contact to a support Download PDF

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Publication number
US3592996A
US3592996A US844290A US3592996DA US3592996A US 3592996 A US3592996 A US 3592996A US 844290 A US844290 A US 844290A US 3592996D A US3592996D A US 3592996DA US 3592996 A US3592996 A US 3592996A
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Prior art keywords
support
contact
hole
securing
region
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Expired - Lifetime
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US844290A
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Lawrence Norman Sayer
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ZF International UK Ltd
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Lucas Industries Ltd
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    • 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
    • H01H11/041—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00—Electron-beam welding or cutting
    • B23K15/0046—Welding
    • 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
    • H01R4/02—Soldered or welded connections

Definitions

  • An electron beam is then caused to traverse the contact in support in such a way that the part of the support traversed by the beam melts and an area of the contact close to the melted portion of the support is heated to a temperature between the melting points of the contact and support so that the support flows to form a joint.
  • the spring support has to be subjected to a heat treatment to give it the required properties, and if the contact is brazed to the support before this heat treatment, the brazing joint is ruined by the heat treatment.
  • the alternative is to braze the contact to the spring support after the heat treatment, but then the brazing operation ruins the spring properties.
  • the present invention seeks to overcome this problem, but although it provides primarily a method of securing a contact to a spring support, it can also be used advantageously to secure a contact to a support which does not have to have resilient properties. in the latter case, straightforward brazing can of course b employed, but the method in accordance with the invention is more convenient.
  • the method according to the invention comprises maintaining a contact in facial engagement with a support, the contact having a higher melting point than the support, and causing an electron beam to traverse the contact and support in such a way that the part of the support traversed by the beam melts and an area of the contact close to the melted portion of the support is heated to a temperature between the melting points of the contact and support so that the support flows to form a joint.
  • the support is formed with a hole through which the contact is exposed, and the portion of the support around the hole is melted.
  • a contact 11 formed from tungsten to a spring steel support 12.
  • the support 12 is formed with a circular hole 13, and the contact I] is supported in facial contact with the support 12 so that the contact H is exposed through the hole 13.
  • the joining is effected by means of an electron beam having a focus indicated at 14. with the focal axis indicated at 15.
  • the axis impinges on the contact 1! adjacent the edge of the hole 13, and because the focus 14 is above the support 12, the beam diverges as indicated and impinges on the support 12.
  • the focus is moved in a circular path indicated at 16 so that the axis 15 moves in a circular path parallel to the edge of the hole 13.
  • the support 12 melts and the contact is heated to a temperature above the melting point of the support, so that the melted support flows to the hotter region and effects the required joint.
  • the differential heating could of course be achieved in other ways, for example by controlling the beam density and/or path of traverse.
  • the focus could be on or below the contact and the beam moved in a circular path but with a sinusoidal component.
  • the voltage which accelerates the electrons from their source could be suitably controlled.
  • the invention is of particular use with movable contacts for distributor contactsets, and has been found to increase contact life and substantially increase the permissible operating speed of the contacts.
  • a method of securing an electrical contact to a support comprising the steps of maintaining the contact in facial engagement with the support, the contact having a higher melting point than the support, and the support being formed with a ole through whic the contact is exposed, and causing an electron beam to traverse the contact and the region of the support directly adjacent the hole in such a way that the region ofthe support traversed by the beam melts and an area of the contact close to the melted region of the support is heated to a temperature between the melting points of the contact and support so that the melted region of the support flows into said hole to form a joint between the contact and the support.

Abstract

In manufacturing a movable contact for use in electrical apparatus, for example a contact breaker in a distributor, the contact is maintained in facial engagement with a support which has a lower melting point than the contact. An electron beam is then caused to traverse the contact in support in such a way that the part of the support traversed by the beam melts and an area of the contact close to the melted portion of the support is heated to a temperature between the melting points of the contact and support so that the support flows to form a joint.

Description

United States Patent METHOD OF SECURING AN ELECTRICAL CONTACT TO A SUPPORT 2 Claims, l Drawing Fig.
U.S.Cl 2l9/l2l, 200/166 Int. Cl 523k 15/00 Field of Search 29/630;
[56] References Cited UNITED STATES PATENTS 2,057,604 10/1936 Zickrick 200/166 2.987.610 6/ I961 Steigerwald 0. 219/117 3,075,281 1/1963 Spooner 29/l55.55 3,240,908 3/1966 Marcoux H 200/138 Primary Examiner-J. V. Truhe Assistant Examiner-R. E. O'Neill Attorney-Holman and Stern ABSTRACT: in manufacturing a movable contact for use in electrical apparatus, for example a contact breaker in a distributor, the contact is maintained in facial engagement with a support which has a lower melting point than the contact. An electron beam is then caused to traverse the contact in support in such a way that the part of the support traversed by the beam melts and an area of the contact close to the melted portion of the support is heated to a temperature between the melting points of the contact and support so that the support flows to form a joint.
METHOD OF SECURING AN ELECTRICAL CONTACT TO A SUPPORT in the manufacture of a movable contact for use in electrical apparatus, for example a contact breaker in a distributor for a road vehicle, it is necessary to secure the actual contact, which may be made from tungsten, to a spring support, which typically will be made from steel. The usual way of effecting such a connection is to braze the contact to a support pin, then to insert the support pin through a hole in the spring support and rivet the pin in position. Clearly, it would be much more convenient to secure the contact directly to the spring support, but this operation leads to difficulty. The spring support has to be subjected to a heat treatment to give it the required properties, and if the contact is brazed to the support before this heat treatment, the brazing joint is ruined by the heat treatment. The alternative is to braze the contact to the spring support after the heat treatment, but then the brazing operation ruins the spring properties.
The present invention seeks to overcome this problem, but although it provides primarily a method of securing a contact to a spring support, it can also be used advantageously to secure a contact to a support which does not have to have resilient properties. in the latter case, straightforward brazing can of course b employed, but the method in accordance with the invention is more convenient.
The method according to the invention comprises maintaining a contact in facial engagement with a support, the contact having a higher melting point than the support, and causing an electron beam to traverse the contact and support in such a way that the part of the support traversed by the beam melts and an area of the contact close to the melted portion of the support is heated to a temperature between the melting points of the contact and support so that the support flows to form a joint.
Preferably the support is formed with a hole through which the contact is exposed, and the portion of the support around the hole is melted.
The accompanying drawing illustrates diagrammatically one example of the invention.
Referring to the drawing, it is desired to secure a contact 11 formed from tungsten to a spring steel support 12. The support 12 is formed with a circular hole 13, and the contact I] is supported in facial contact with the support 12 so that the contact H is exposed through the hole 13. The joining is effected by means of an electron beam having a focus indicated at 14. with the focal axis indicated at 15. The axis impinges on the contact 1! adjacent the edge of the hole 13, and because the focus 14 is above the support 12, the beam diverges as indicated and impinges on the support 12. The focus is moved in a circular path indicated at 16 so that the axis 15 moves in a circular path parallel to the edge of the hole 13. and the arrangement is such that the support 12 melts and the contact is heated to a temperature above the melting point of the support, so that the melted support flows to the hotter region and effects the required joint. The differential heating could of course be achieved in other ways, for example by controlling the beam density and/or path of traverse. For example the focus could be on or below the contact and the beam moved in a circular path but with a sinusoidal component. Alternatively, the voltage which accelerates the electrons from their source could be suitably controlled.
The invention is of particular use with movable contacts for distributor contactsets, and has been found to increase contact life and substantially increase the permissible operating speed of the contacts.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is:
l. A method of securing an electrical contact to a support, comprising the steps of maintaining the contact in facial engagement with the support, the contact having a higher melting point than the support, and the support being formed with a ole through whic the contact is exposed, and causing an electron beam to traverse the contact and the region of the support directly adjacent the hole in such a way that the region ofthe support traversed by the beam melts and an area of the contact close to the melted region of the support is heated to a temperature between the melting points of the contact and support so that the melted region of the support flows into said hole to form a joint between the contact and the support.
2. A method as claimed in claim 1 in which the support is a spring support.

Claims (2)

1. A method of securing an electrical contact to a support, comprising the steps of maintaining the contact in facial engagement with the support, the contact having a higher melting point than the support, and the support being formed with a hole through which the contact is exposed, and causing an electron beam to traverse the contact and the region of the support directly adjacent the hole in such a way that the region of the support traversed by the beam melts and an area of the contact close to the melted region of the support is heated to a temperature between the melting points of the contact and support so that the melted region of the support flows into said hole to form a joint between the contact and the support.
2. A method as claimed in claim 1 in which the support is a spring support.
US844290A 1968-08-09 1969-07-24 Method of securing an electrical contact to a support Expired - Lifetime US3592996A (en)

Applications Claiming Priority (1)

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GB3806468 1968-08-09

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US3592996A true US3592996A (en) 1971-07-13

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US (1) US3592996A (en)
JP (1) JPS501423B1 (en)
DE (1) DE1940436A1 (en)
ES (1) ES371019A1 (en)
FR (1) FR2015351A1 (en)
GB (1) GB1265309A (en)
SE (1) SE363961B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066864A (en) * 1973-07-09 1978-01-03 Owens-Corning Fiberglas Corporation Method and apparatus for producing feeders for supply of heat softenable materials
US4341942A (en) * 1978-10-31 1982-07-27 International Business Machines Corporation Method of bonding wires to passivated chip microcircuit conductors
EP0118859A2 (en) * 1983-03-11 1984-09-19 INOVAN-Stroebe GmbH & Co. KG Method of manufacturing electromechanical contact components
EP1355331A2 (en) * 2002-04-19 2003-10-22 Kramski GmbH Fixation of a contact element
US20080110230A1 (en) * 2006-11-14 2008-05-15 Guay Matthew J Systems and methods for producing assemblies

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3005662C2 (en) * 1980-02-15 1983-10-27 G. Rau GmbH & Co, 7530 Pforzheim Method for producing a contact element
DE4317950A1 (en) * 1993-05-28 1994-12-01 Siemens Ag Coated metal strip as a semi-finished product for electrical contact pieces and method for applying such contact pieces to a carrier
DE4416104C2 (en) * 1994-04-19 2000-07-13 Siemens Ag Switch contact arrangement of an electrical circuit breaker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2057604A (en) * 1934-05-23 1936-10-13 Gen Electric Electrical switch contact
US2987610A (en) * 1959-02-20 1961-06-06 Zeiss Carl Method and means for welding using a controlled beam of charged particles
US3075281A (en) * 1958-10-03 1963-01-29 Engelhard Ind Inc Method for producing an electrical contact element
US3240908A (en) * 1960-12-19 1966-03-15 Texas Instruments Inc Thermostatic switches

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2057604A (en) * 1934-05-23 1936-10-13 Gen Electric Electrical switch contact
US3075281A (en) * 1958-10-03 1963-01-29 Engelhard Ind Inc Method for producing an electrical contact element
US2987610A (en) * 1959-02-20 1961-06-06 Zeiss Carl Method and means for welding using a controlled beam of charged particles
US3240908A (en) * 1960-12-19 1966-03-15 Texas Instruments Inc Thermostatic switches

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066864A (en) * 1973-07-09 1978-01-03 Owens-Corning Fiberglas Corporation Method and apparatus for producing feeders for supply of heat softenable materials
US4341942A (en) * 1978-10-31 1982-07-27 International Business Machines Corporation Method of bonding wires to passivated chip microcircuit conductors
EP0118859A2 (en) * 1983-03-11 1984-09-19 INOVAN-Stroebe GmbH & Co. KG Method of manufacturing electromechanical contact components
EP0118859A3 (en) * 1983-03-11 1985-01-09 INOVAN-Stroebe GmbH & Co. KG Method of manufacturing electromechanical contact components
EP1355331A2 (en) * 2002-04-19 2003-10-22 Kramski GmbH Fixation of a contact element
EP1355331A3 (en) * 2002-04-19 2004-03-17 Kramski GmbH Fixation of a contact element
US6812418B2 (en) 2002-04-19 2004-11-02 Kramski Gmbh Fastening of a contact element
US20080110230A1 (en) * 2006-11-14 2008-05-15 Guay Matthew J Systems and methods for producing assemblies
US7823272B2 (en) 2006-11-14 2010-11-02 The Gillette Company Systems for producing assemblies
US20110010929A1 (en) * 2006-11-14 2011-01-20 Guay Matthew J Systems for producing assemblies

Also Published As

Publication number Publication date
SE363961B (en) 1974-02-11
JPS501423B1 (en) 1975-01-17
GB1265309A (en) 1972-03-01
DE1940436A1 (en) 1970-02-12
ES371019A1 (en) 1972-03-16
FR2015351A1 (en) 1970-04-24

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