US2932880A - Method of making electrical switching devices - Google Patents

Method of making electrical switching devices Download PDF

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Publication number
US2932880A
US2932880A US490219A US49021955A US2932880A US 2932880 A US2932880 A US 2932880A US 490219 A US490219 A US 490219A US 49021955 A US49021955 A US 49021955A US 2932880 A US2932880 A US 2932880A
Authority
US
United States
Prior art keywords
tips
strip
plates
switching devices
electrical switching
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
US490219A
Other languages
English (en)
Inventor
John S Gellatly
Charles F Triteline
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.)
AT&T Corp
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 US490219A priority Critical patent/US2932880A/en
Priority to FR1143064D priority patent/FR1143064A/fr
Priority to NL201806A priority patent/NL99591C/xx
Priority to DEW18067A priority patent/DE1171547B/de
Priority to BE544153A priority patent/BE544153A/xx
Priority to GB5496/56A priority patent/GB781557A/en
Application granted granted Critical
Publication of US2932880A publication Critical patent/US2932880A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H63/00—Details of electrically-operated selector switches
    • H01H63/02—Contacts; Wipers; Connections thereto
    • H01H63/04—Contact-making or contact-breaking wipers; Position indicators therefor
    • 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
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
    • Y10T29/4921—Contact or terminal manufacturing by assembling plural parts with bonding
    • Y10T29/49211—Contact or terminal manufacturing by assembling plural parts with bonding of fused material
    • Y10T29/49213—Metal

Definitions

  • This invention relates to the method of making electrical switching devices, and more particularly to the method of making step-by-step switch wipers.
  • An object of the invention is to provide new and improved methods of making switch wipers.
  • Another object of the invention is to provide new and improved methods of making step-by-step switch wipers.
  • a further object of the invention is to provide methods of making contact springs or wipers having convex precious metal contacts backed by convex base metal tips.
  • a method illustrating certain features of the invention may include cutting out portions of a strip of spring metal to form only tip ends of elongated contact springs, welding precious metal tips to the tip ends, and then forming the tip ends and blanking and forming the remaining portions of the contact springs.
  • FIG. 1 is a top plan view of a strip of stock having contact wiper springs in progressive stages of completion fonned therefrom by a method forming one embodiment of the invention
  • Fig. 2 is an enlarged top plan view of a finished contact wiper spring
  • Fig. 3 is an enlarged side elevation of the wiper spring shown in Fig. 2;
  • Fig. 4 is an enlarged fragmentary partially sectional view of the wiper spring shown in Fig. 2, and
  • Fig. 5 is an enlarged fragmentary perspective view of the spring shown in Fig. 2.
  • a strip composed of electroconductive spring metal stock such as, for example, nickel silver or solder coated nickel silver from which a step-by-step wiper spring 11 is to be fabricated, cut and formed.
  • Pilot holes 12 are first formed in the strip to index the strip, and notches 13 are formed in the strip to form tips 14 and necks 15.
  • rectangular plates 16 of precious metal such as, for example, an alloy of gold, silver and palladium, larger than the tips 14 are welded to one face of the tips.
  • the plates 16 have welding beads or bars 24 thereon which fuse with the tips 14 at the portions thereof in contact with the tips 14.
  • the notches 13 are preferably formed by a punch press and then welding of the plates can be effected by a separate welding machine, the strip 10 being uncoiled from a roll and then recoiled for each of these steps, after which the remaining steps may be done by a progressive punch and die.
  • the strip has no portions except the thin fiat plates 16 out of the plane thereof to interfere with reeling and unreeling operations thereof.
  • the tips 14 of the wipers 11 are strongly bonded to the plates 16 and provide rigidity and mechanical strength for the resulting tip assemblies. Also, the plates 16 extend beyond the front and sides of the tips 14 so that the ends 17 of the plates may be cut olf or trimmed without also cutting the tips 14.
  • the precious metal plates 16 are not contaminated by the base metal of the tips 14 as: would occur if the tips 14 were trimmed with the plates 16.
  • the scrapping of the plates 16 is avoided, and the precious metal scrap is uncontaminated.
  • the plate extends substantially beyond the tip 14 so that a large quantity of precious metal is available before the edge 19 wears down to the tips 14.
  • the material available for wear is that to the right of a broken-line 31, as viewed in Fig. 4. This wear material is increased at the critical point by the bead.
  • the tips 14 provide high mechanical strength to the combined tip assemblies, and, since the tips 14 are full thickness throughout, this strength is present near the wear portions of the plates 16.
  • the method of making wiper springs each having a body portion, a terminal, a bent shank, a bent neck, a convex tab and a convex face plate of precious metal connected to the tab which comprises forming notches along one edge of a strip of fiat spring metal to form the neck and a laterally extending tab having rounded ends, welding a fiat rectangular face plate substantially longer and wider than the tab to one face of the tab whereby the plate extends beyond the front and the sides of the tab, trimming only the portions of the rectangular plate extending beyond the front and sides of the tab to conform to the shape of the tab, then forming the tab and the plate to convex shapes, cutting the terminal outlines in the strip, then cutting the notches longer to form the shank, then bending the neck and the shank to final bent form, then forming the body portion in the strip, and then cutting the finished spring from the strip.
  • a method of fabricating electrical contact wipers having precious metal contact surfaces which comprises punching out spaced acute angular sections along an edge of a strip of flat base metal to form spaced contact shanks having two tips laterally extending from the ends thereof, welding individual fiat precious metal contact elements to the flat tips of the shanks so that the elements overlay and extend laterally and forwardly beyond the edges of the tips, trimming the edges of the precious metal that extend beyond the edges of the tips without Patented Apr. 19,.196 0 Q 7 trimmingathe tips, then formingboth the tabs and precious metal contact elements into a convex shape,- and then punching out body portions attached to the shanks from the strip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Switches (AREA)
US490219A 1955-02-24 1955-02-24 Method of making electrical switching devices Expired - Lifetime US2932880A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US490219A US2932880A (en) 1955-02-24 1955-02-24 Method of making electrical switching devices
FR1143064D FR1143064A (fr) 1955-02-24 1955-10-11 Ressort de contact
NL201806A NL99591C (forum.php) 1955-02-24 1955-11-07
DEW18067A DE1171547B (de) 1955-02-24 1955-12-16 Verfahren zur Herstellung von mit Edelmetall-Kontakten ausgestatteten Kontaktfedern
BE544153A BE544153A (forum.php) 1955-02-24 1956-01-04
GB5496/56A GB781557A (en) 1955-02-24 1956-02-22 Electric switch contact wiper spring and method of making the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US490219A US2932880A (en) 1955-02-24 1955-02-24 Method of making electrical switching devices

Publications (1)

Publication Number Publication Date
US2932880A true US2932880A (en) 1960-04-19

Family

ID=23947106

Family Applications (1)

Application Number Title Priority Date Filing Date
US490219A Expired - Lifetime US2932880A (en) 1955-02-24 1955-02-24 Method of making electrical switching devices

Country Status (6)

Country Link
US (1) US2932880A (forum.php)
BE (1) BE544153A (forum.php)
DE (1) DE1171547B (forum.php)
FR (1) FR1143064A (forum.php)
GB (1) GB781557A (forum.php)
NL (1) NL99591C (forum.php)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127491A (en) * 1960-01-11 1964-03-31 Mc Graw Edison Co High voltage air switch
US3172982A (en) * 1963-07-25 1965-03-09 Sensing Devices Inc Sensing brush assembly
US3190996A (en) * 1963-05-02 1965-06-22 Republic Ind Corp Precision formed metal bars having hardened bearing portions
US3210508A (en) * 1963-08-05 1965-10-05 Automatic Elect Lab Replacement terminal for attachment to broken off end of electrical contact spring
US3229357A (en) * 1961-07-05 1966-01-18 Schlatter Ag Process and apparatus for manufacturing contact blades
US3251121A (en) * 1962-08-07 1966-05-17 Bell Telephone Labor Inc Method of making reed-type switch contacts
US3283106A (en) * 1964-03-05 1966-11-01 Burgess Products Co Ltd Electrical contact elements
US3302270A (en) * 1962-11-09 1967-02-07 Photocircuits Corp Method of wear-resistant coating a commutator contact surface
US3343257A (en) * 1965-05-05 1967-09-26 Automatic Elect Lab Method of applying precious metal tip to base metal switch wiper
US3559604A (en) * 1967-04-13 1971-02-02 Elco Corp Method of forming swaged contacts using progressive die
US3665881A (en) * 1970-07-27 1972-05-30 Amf Inc Spring blades for contact arms and the method for making the same
DE2166378A1 (de) * 1970-08-17 1973-11-29 Fraze Ermal C Verfahren zur herstellung einer ringaehnlichen zuglasche aus blechmaterial zum leichten oeffnen einer dosenstirnwand
US6329621B1 (en) * 1997-04-08 2001-12-11 Trw Automotive Electronics & Components Gmbh & Co. Kg Electric switch apparatus with resilient bent wire contact members

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1093867B (de) * 1958-08-07 1960-12-01 Siemens Ag Schalter oder Stecker mit schleifendem Kontakt
JP3034011B2 (ja) * 1990-10-31 2000-04-17 アルプス電気株式会社 摺動接点の製造方法
CN113798395B (zh) * 2020-06-11 2022-11-08 福立旺精密机电（中国）股份有限公司 一种u型件的制造方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2116269A (en) * 1937-01-18 1938-05-03 Kobzy Steven Method of forming electrical contacts
US2127648A (en) * 1936-09-26 1938-08-23 Western Electric Co Welding method
US2360063A (en) * 1940-05-07 1944-10-10 Western Electric Co Composite article
US2379641A (en) * 1942-07-21 1945-07-03 Baker & Co Inc Electrical contact element
US2458552A (en) * 1943-12-20 1949-01-11 Bell Telephone Labor Inc Method of making electrical contacting elements
US2571040A (en) * 1948-07-08 1951-10-09 Western Electric Co Method of making switch parts
US2699597A (en) * 1950-02-07 1955-01-18 Hewlett Packard Co Method of manufacturing finger contacts
US2746131A (en) * 1949-04-02 1956-05-22 Gen Motors Corp Method of making a circuit breaker lever

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2032926A (en) * 1935-02-01 1936-03-03 Gen Electric Electrical contact
DE909754C (de) * 1946-06-26 1954-04-26 Erik Arne Angerby Verfahren zur Herstellung von mit Kontakten ausgebildeten Kontaktfedern

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2127648A (en) * 1936-09-26 1938-08-23 Western Electric Co Welding method
US2116269A (en) * 1937-01-18 1938-05-03 Kobzy Steven Method of forming electrical contacts
US2360063A (en) * 1940-05-07 1944-10-10 Western Electric Co Composite article
US2379641A (en) * 1942-07-21 1945-07-03 Baker & Co Inc Electrical contact element
US2458552A (en) * 1943-12-20 1949-01-11 Bell Telephone Labor Inc Method of making electrical contacting elements
US2571040A (en) * 1948-07-08 1951-10-09 Western Electric Co Method of making switch parts
US2746131A (en) * 1949-04-02 1956-05-22 Gen Motors Corp Method of making a circuit breaker lever
US2699597A (en) * 1950-02-07 1955-01-18 Hewlett Packard Co Method of manufacturing finger contacts

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127491A (en) * 1960-01-11 1964-03-31 Mc Graw Edison Co High voltage air switch
US3229357A (en) * 1961-07-05 1966-01-18 Schlatter Ag Process and apparatus for manufacturing contact blades
US3251121A (en) * 1962-08-07 1966-05-17 Bell Telephone Labor Inc Method of making reed-type switch contacts
US3302270A (en) * 1962-11-09 1967-02-07 Photocircuits Corp Method of wear-resistant coating a commutator contact surface
US3190996A (en) * 1963-05-02 1965-06-22 Republic Ind Corp Precision formed metal bars having hardened bearing portions
US3172982A (en) * 1963-07-25 1965-03-09 Sensing Devices Inc Sensing brush assembly
US3210508A (en) * 1963-08-05 1965-10-05 Automatic Elect Lab Replacement terminal for attachment to broken off end of electrical contact spring
US3283106A (en) * 1964-03-05 1966-11-01 Burgess Products Co Ltd Electrical contact elements
US3343257A (en) * 1965-05-05 1967-09-26 Automatic Elect Lab Method of applying precious metal tip to base metal switch wiper
US3559604A (en) * 1967-04-13 1971-02-02 Elco Corp Method of forming swaged contacts using progressive die
US3665881A (en) * 1970-07-27 1972-05-30 Amf Inc Spring blades for contact arms and the method for making the same
DE2166378A1 (de) * 1970-08-17 1973-11-29 Fraze Ermal C Verfahren zur herstellung einer ringaehnlichen zuglasche aus blechmaterial zum leichten oeffnen einer dosenstirnwand
US6329621B1 (en) * 1997-04-08 2001-12-11 Trw Automotive Electronics & Components Gmbh & Co. Kg Electric switch apparatus with resilient bent wire contact members

Also Published As

Publication number Publication date
DE1171547B (de) 1964-06-04
NL99591C (forum.php) 1961-11-15
FR1143064A (fr) 1957-09-26
GB781557A (en) 1957-08-21
BE544153A (forum.php) 1956-01-31
NL201806A (forum.php) 1961-06-15

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