US1907930A - Process of manufacturing electrical contact members - Google Patents

Process of manufacturing electrical contact members Download PDF

Info

Publication number
US1907930A
US1907930A US497755A US49775530A US1907930A US 1907930 A US1907930 A US 1907930A US 497755 A US497755 A US 497755A US 49775530 A US49775530 A US 49775530A US 1907930 A US1907930 A US 1907930A
Authority
US
United States
Prior art keywords
contact
metal
base metal
base
process
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
Application number
US497755A
Inventor
Arthur H Adams
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Western Electric Co Inc
Original Assignee
Western Electric Co Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to US497755A priority Critical patent/US1907930A/en
Application granted granted Critical
Publication of US1907930A publication Critical patent/US1907930A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00Apparatus or processes specially adapted for manufacture of electric switches
    • H01H11/04Apparatus or processes specially adapted for manufacture of electric switches of switch contacts
    • H01H11/041Apparatus or processes specially adapted for manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion
    • H01H11/043Apparatus or processes specially adapted for manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion by resistance welding
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49002Electrical device making
    • Y10T29/49117Conductor or circuit manufacturing
    • Y10T29/49204Contact or terminal manufacturing
    • Y10T29/49208Contact or terminal manufacturing by assembling plural parts
    • Y10T29/4921Contact or terminal manufacturing by assembling plural parts with bonding
    • Y10T29/49211Contact or terminal manufacturing by assembling plural parts with bonding of fused material
    • Y10T29/49213Metal

Description

1-2 ADAMs May 9, 19330 PROCESS OF MANUFACTURING ELECTRICAL CONTACT MEMBERS Filed Nov. 24, 1930 Patented May 9 1933 UNITED STATES PATENT OFFICE ARTHUR H. ADAMS, OF NEW YORK, N. Y., ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, 011' NEW YORK, N. Y., A CORPORATION OF NEW YORK PROCESS OF MANUFACTURING ELECTRICAL CONTACT MEMBERS Application filed November 24, 1930. Serial No. 497,755.

This invention relates to a process of manufacturing electrical contact members, and more particularly to a process of manufacturing bimetallic electrical contact elements.

It is the object of the present 1nvent1on'to provide a process of manufacturingbimetallic, electrical contact elements, utilizing a minimum quantity of contact metal wh1le providing a substantial effective contact surface.

In accordance with one embodiment, the invention contemplates forming a substantially rectangular ribbon of base metal, forming a strip of contact metal to a sub stantially elliptical cross-sectional shape with laterally extending portions at the smaller ends of the ellipse, and welding the contact metal to the base metal. After the strip of contact metal and the ribbon of. base metal have been shaped as described hereinbefore and welded together, the laterally extending portions of the contact metal are bent out of their normal plane to surround partially the adjacent edges of the base metal, thereby to provide a greater area protected by contact metal when the contact elements are mounted upon contact springs of electrical apparatus. A composite strip of base and contact metal formed as hereinbefore described may be cut to predetermined lengths and welded to contact springs and angularly disposed with respect to each other.

A better understanding of the invention may be had by referring to the following de'- tailed description of one embodiment thereof when considered in conjunction with the accompanying drawing, wherein Fig. 1 is a cross-sectional view through a forming apparatus in which the wire of contact metal is positioned and formed to the shape shown;

Fig. 2 is a sectional view through a strip of contact metal and ribbon of base metal'and a pair of welding electrodes showing the relative position of the electrodes and the base and contact metal before the welding operation takes place;

Fig. 3 is a cross-sectional view of a com- 50 posite bimetallic strip composed of a ribbon of base metal and strip of contact metal after the welding operation;

Fig. 4 is a plan view showing a composite bimetallic strip after the laterally extending portions of the contact metal have been formed out of their normal plane;

Fig. 5 is a sectional view taken on the line 5-615 of Fig. 4 in the direction of the arrows, an

Fig. 6 is a perspective View of a contact spring with the composite bimetallic contact element welded thereto.

Referring now to the drawing wherein like reference characters designate the same parts throughout the several views, the numeral 7 indicates a wire of contact metal such as platinum, palladium, alloys of platinum and gold or palladium and gold or sim ilar metals of the composition commonly used in electrical contact elements which has been deformed from a regular cylindrical w1re by means of cooperating swage blocks 8 and 9 to the shape shown wherein portions of the metal of the wire have been swaged outwardly at diametrically opposite points to form laterally extending projections 11 and 13 and upper and lower rounded surfaces 10 and 12, respectively. After a wire of contact metal has been so formed a strip or ribbon of base metal 15 of nickel silver or pure nickel of a substantially rectangular cross-section with rounded edges is combined with the contact metal in the manner shown in Fig. 2 with the rounded lower surface 12 of the contact metal making a line contact with the base metal and welding electrodes 17 and 19 are applied to the lower, flat surface of the base metal 15 and the upper, rounded surface 10 of the wire 7 of contact metal and a welding current is applied to the electrodes in any well known manner. As is usual in welding operations, pressure is exerted upon the contact and base metals while the welding current is being applied to cause them to join together by fusion thereof in the manner shown in Fig. 3.

It has been found that because of the difference in fusing temperatures of contact metal such as platinum or palladium and alloys thereof and base metal such asnickel silver, pure nickel or other metals havin a high resistance to corrosion, that if a line contact is rovided between the two metals, as shown in Fig. 2, the welding current in assing from the wire 7 of platinum or Slmlar metal to the strip 15 of nickel silver or similar metal will be concentrated and will encounter the greatest resistance at the line of contact and the metals will fuse simultaneously roviding a very satisfactor weld with an al oy ofthe two-metals being ormed in the area indicated by the numeral 18, Fig. 3. This substantially simultaneous fusing of the contact and base metals is due to the fact that the base metal being large in crosssectional area will not heat as rapidly as the contact metal, which at the line where the welding action takes place and where the concentration of the welding current occurs is relatively small in cross-sectional area, thereby causing the base and contact metals along the line of contact therebetween to reach their melting temperatures at approximately the same time, thus providing an intimate mixture and alloying of the metals and a strong welded union between them.

After a ribbon of base metal and a wire of contact metal have been welded together to form a continuous strip of theshape shown in cross-section in Fig. 3, the laterally extending projections 11 and 13 of contact metal are formed by suitable forming-members to the shape shown in cross-section in Fig. 5, whereupon the composite strip so formed may. be cut to predetermined lengths along the lines 20 and 21 (Fig. 4) to form composite bimetallic contact elements 23. The laterally extending projections 11 and 13 thus form an apron over the base metal to provide a greater area covered with contact metal thereby preventing the deposition of oxides of the base metal on the contact metal which would otherwise be caused by arcing between the base and contact metal of cooperating contact elements.

Contact elements 23 formed in accordance with the steps outlined hereinbefore may then be secured by welding to springs 22 for use in electromagnetic relays or like apparatus. It will be noted that the contact element 23 as shown in Fig. 6, is angularly disposed upon the fiat surface of the contact spring 22. Another contact element 23 fixed diagonally to a spring (not shown) will provide a cooperating contacting surface for use in conjunction with the contact element and spring shown in Fig. 6, the contact elements being angularly disposed with respect to each other, a cross contact being thus provided.

Although this invention has been described as utilizing a specific form of ribbon or base metal and wire of contact metal, it will be understood that various modifications and adaptations of the method outlined in detail hereinbefore may be made without departing from the scope of the invention, which is to be limited only by the scope of the appended claims.

\Vhat is claimed is:

1. The process of manufacturing bimetallic contact elements which includes forming a base metal to predetermined dimensions, forming a contact metal to a predetermined irregular formation, combining the base metal and contact metal, welding the contact metal to the base metal to form a composite member, and forming the contact metal over the base metal to protect the base metal.

2. The process of manufacturing bimetallic contact elements which includes forming a ribbon of base metal of predetermined dimensions, pressing a wire of contact metal to form horizontally extending projections upon diametrically opposite portions thereof, combining the ribbon of base metal and the wire of contact metal with the projections of the wire of contact metal parallel to the widest surface of the base metal, welding the base metal and wire of contact metal while maintained in that relative position, and thereafter forming the composite strip into its final shape.

3. The process of manufacturing bimetallic contact elements which includes forming a ribbon of base metal of predetermined dimensions, pressing a wire of contact metal to form horizontally extending projections upon diametrically opposite portions thereof, combining the ribbon of base metal and the wire of contact metal with the projections of the contact metal parallel to the widest surface of the base metal, welding the base metal and the wire of contact metal while maintained in that relative position, and forming the projections of contact metal out of their normal horizontal plane to surround partially the vertical portions of the base metal.

4. The process of manufacturing bimetallic contact elements which includes forming a ribbon of base metal of predetermined dimensions, pressing a wire of contact metal to form horizontally extending projections upon diametrically opposite portions thereof, combining the ribbon of base metal and the wire of contact metal with the projections of the contact metal parallel to the widest surface of the base metal, welding the base metal and the wire of contact metal while maintained in that relative position, and formingthe projections of contact metal out of their normal horizontal plane to surround partially the vertical portions of the base metal while retaining the rounded upper surface of the contact metal.

5. The process of manufacturing bimetallic contact elements which includes forming a ribbon of base metal of predetermined dimensions, forming contact metal to a predetermined irregular formation, combining the neoaeso base metal and contact metal, welding the contact metal to the base metal, forming the composite strip into its final shape, and weld ing the composite strip in its final shape to a contact spring.

6. The process of manufacturing bimetallic contact elements which includes forming a ribbon of base metal of substantially rectangular cross-section, forming a wire of contact metal to an approximately elliptical cross-sectional shape with projecting portions at the smaller ends of the ellipse, welding the contact metal to the base metal with the pro jecting portions of the contact metal parallel to the flat surface of the base metal, and forming the, projecting portions of the contact metal to surround partially the base metal,

7. The process of manufacturing bimetallic contact elements which includes forming a ribbon of base metal of substantially rectangular cross-section, forming a wire of contact metal to an approximately elliptical crosssectional shape with projecting portions at the smaller ends of the ellipse, welding the contact metal to the base metal with the projecting portions of the contact metal parallel to the fiat surface of the base metal, forming the projecting portions of the contact metal to surround partially the base metal, cutting the composite base and contact metal strip into predetermined lengths, and welding the composite strip to contact springs.

8. The process of manufacturing bimetallic contact elements which includes forming a base metal of substantially rectangular cross-sectional shape, forming outwardly extending ridges on a wire of contact metal, combining the base metal and the contact metal, welding the contact metal to the base metal, and forming the ridges of the contact metal over the base metal.

9. The process of forming bi-metallic con-= tact elements for contact arms which comprises forming a base member and a contact 7 member, providing one of said members with a convex surface to make a line contact with the other to localize an electric current, applying an electric current to the parts to weld them together into a. composite member,

forming one of the members over the other member to enclose a portion thereof, and weldmg the composite member to a contact arm.

In witness whereof, I hereunto subscribe my name this 18th day of November, A, D.

ARTHUR H. ADAMS,

US497755A 1930-11-24 1930-11-24 Process of manufacturing electrical contact members Expired - Lifetime US1907930A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US497755A US1907930A (en) 1930-11-24 1930-11-24 Process of manufacturing electrical contact members

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US497755A US1907930A (en) 1930-11-24 1930-11-24 Process of manufacturing electrical contact members

Publications (1)

Publication Number Publication Date
US1907930A true US1907930A (en) 1933-05-09

Family

ID=23978172

Family Applications (1)

Application Number Title Priority Date Filing Date
US497755A Expired - Lifetime US1907930A (en) 1930-11-24 1930-11-24 Process of manufacturing electrical contact members

Country Status (1)

Country Link
US (1) US1907930A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2925647A (en) * 1958-01-28 1960-02-23 Engelhard Ind Inc Method of making electrical contacts
US2960757A (en) * 1956-05-21 1960-11-22 Texas Instruments Inc Method of making electrical heating assembly
US3042474A (en) * 1962-07-03 Vern m
US5334809A (en) * 1990-02-14 1994-08-02 Particle Interconnect, Inc. Particle enhanced joining of metal surfaces
WO2014111416A1 (en) * 2013-01-16 2014-07-24 Tyco Electronics Austria Gmbh Contact element, relay comprising a contact element and method for producing a contact element

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042474A (en) * 1962-07-03 Vern m
US2960757A (en) * 1956-05-21 1960-11-22 Texas Instruments Inc Method of making electrical heating assembly
US2925647A (en) * 1958-01-28 1960-02-23 Engelhard Ind Inc Method of making electrical contacts
US5334809A (en) * 1990-02-14 1994-08-02 Particle Interconnect, Inc. Particle enhanced joining of metal surfaces
US5835359A (en) * 1990-02-14 1998-11-10 Particle Interconnect Corporation Electrical interconnect using particle enhanced joining of metal surfaces
WO2014111416A1 (en) * 2013-01-16 2014-07-24 Tyco Electronics Austria Gmbh Contact element, relay comprising a contact element and method for producing a contact element

Similar Documents

Publication Publication Date Title
US3180958A (en) Thermal switch having temperature sensitive pellet and sliding disc contact
KR890001690B1 (en) Surface-metalized,bonded fuse with mechanically-stabilized end caps
US2790656A (en) Aluminum-dissimilar metal joint and method of making same
USRE25988E (en) Electrical switching device and method for making
US3781981A (en) Method for making armature-commutator assembly having armature winding of very small diameter
US5668522A (en) Slowly-breaking fuse and method of production
US3548239A (en) Spark plug electrode construction
CN102027560B (en) Protective element and method for manufacturing the same
US2387903A (en) Contacting element
US3356882A (en) Spark plug having the center electrode sheath with a nickel alloy
JP3562685B2 (en) Fuse and a method of manufacturing the same
US4944084A (en) Fuse and manufacturing method thereof
JP3636603B2 (en) Connection method of connecting plate and connecting plate
US3384958A (en) Method of brazing
US2250156A (en) Electrical connection
US3592993A (en) Method of joining aluminum to aluminum
JPH0766734B2 (en) Method of manufacturing a fuse
US3136032A (en) Method of manufacturing semiconductor devices
US2888742A (en) Compound metal member
US2137617A (en) Electrical contact and method of making the same
US4344058A (en) Low voltage cartridge fuse design
US2069171A (en) Relay
US2709211A (en) Electrical connectors for resistance elements on glass plates
US3819418A (en) Thermoelectric generator and method of producing the same
US3307246A (en) Method for providing multiple contact terminations on an insulator