US2458552A - Method of making electrical contacting elements - Google Patents

Method of making electrical contacting elements Download PDF

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Publication number
US2458552A
US2458552A US708855A US70885546A US2458552A US 2458552 A US2458552 A US 2458552A US 708855 A US708855 A US 708855A US 70885546 A US70885546 A US 70885546A US 2458552 A US2458552 A US 2458552A
Authority
US
United States
Prior art keywords
noble metal
bar
wipers
wiper
base metal
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
US708855A
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English (en)
Inventor
David G Blattner
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
Bell Telephone Laboratories 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
Priority to BE468047D priority Critical patent/BE468047A/xx
Priority to GB15415/46A priority patent/GB612251A/en
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US708855A priority patent/US2458552A/en
Application granted granted Critical
Publication of US2458552A publication Critical patent/US2458552A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • a still further and more particular object is to set forth a means of manufacturing the composite wiper, having the above advantages, by means of a simple and economically practical process, the steps of which may be followed one after the other at the same place with inappreciable time delays between said steps or may be followed at different places and with considerable time delay between said steps.
  • brushes or wipers may be required to travel over a multiplicity of terminals before arriving at the one with which electrical contact is desired, and when it arrives at the desired terminal it is essential that an intimate, low-resistance contact should be established, particularly when the contact is in a circuit carrying talking currents.
  • One way of obtaining such a contact is to make the terminal and the wiper of a noble metal. This, however, is expensive and furthermore may not be entirely satisfactory because of the fact that the wiper and terminal must not only be made of suitable material, but they must also be held in contact with suitable mechanical pressure and materials suitable from a contact point of view do not in general have good spring characterisitcs.
  • a feature of the applicants invention is therefore to provide a method of manufacture which permits increase in the bonding area and proper disposition of it so as to increase the mechanical reliability and to facilitate manufacture, realization of suitable strentgh, securing of a long life noble metal contact in so far as wear of the Wiper is concerned and reduction to a minimum of the amount of noble metal. required.
  • Fig. 1 shows a typical terminal bank and a wiper on a shaft for establishing electrical connections with said terminals
  • Fig. 2 shows an enlarged cross-section of the compound noble metal and base metal bars from which the wipers are made
  • Fig. 3 shows a sheet rolled out from such a composite bar as shown in Fig. 2 and comprising the noble metal band and the base metal sides with wipers marked as punched out from the sheet;
  • Fig. 4 shows a side view of a wiper made in accordance with my method
  • Fig. 5 shows an enlarged side view of a portion of the free end of a wiper
  • Fig. 6 shows an enlarged top view of the end shown in Fig. 5;
  • Fig. 7 shows an enlarged cross-section of the free end with the noble metal tip engaging a a typical terminal bank which may consist of a semicircular arrangement of terminals 5 arranged in horizontal planes with suitable insulation plates 6 between the layers and suitable end plates 1 and binding screws 8 for holdingthe parts together in a complete terminal bank.
  • a shaft 9 is provided on which a typical wiper assembly I may be mounted and so arranged that on the rotation of the shaft the 'free tip of a wiper will engage the surfaces of succeeding terminals 5 of the group. It is, of course, understood that this is merely a typical illustration of wipers and terminal banks well-known in the art and that my invention may be applied to other types without departing from the spirit thereof.
  • a noble metal bar or slug I5 is provided as shown in Fig. 2 of a trapezoidal crosssection with the two opposite sides It and I1 parallel and the two opposite sides [8 and I9 slanted towards each other from the base side l1 to the top side l6.
  • Adjacent to the side I8 is placed the base metal bar 22 of the same thickness as the distance between the sides i6 and ll of the noble metal slug and a similar bar 23 is placed adjacent to the side I9.
  • An alternative arrangement would be to provide in place of bars 22 and 23 a single bar with a suitable slot therein to accommodate the slug i5.
  • my method of manufacture includes such a procedure as may comprise the use of only one bar such as 22 or 23 with the noble metal slug i5. It may be advisable in some instances to so modify the composite bar shown in Fig. 2. The preferred method is as shown but is not intended to exclude from the scope of the invention such obvious rearrangements as mentioned above.
  • the bars 22, I5 and 23 are then welded or otherwise bonded together by methods well known in the art and the composite structure is then rolled out lengthwise so as to form a strip of the proper thickness and flexibility required for wipers.
  • Such a strip is illustrated by numeral 26 in Fig. 3 and it should be noted that the noble metal bar I5 is shown with its side l6 towards the top while the bottom side I! is shown in dotted lines.
  • of the bonding surface marked 32 may be, for example, .05 inch while the thickness 33 of the wipers may be only .01 inch, thus making the slanting bonding surface 32 five times as wide as a bonding surface if run perpendicularly across the' wiper with the resulting effect that the bond would be at least five times as strong as could be obtained with the conventional type of edge lay bond. It is not to be assumed, however, that the scope of.the invention is limited to producing any particular magnification of bondin surface.
  • Fig. 3 may be punched out wipers of the desired formation in pairs such as the pair 34, each wiper being a separate piece but the wipers of a pair having their tips located end to end in the noble metal area so that each wiper would contain a noble metal tip 35 bonded to the base metal shank in the manner described. It would also be satisfactory to slit the sheet lengthwise through the middle of the noble metal strips I6 and punch out the wipers singly instead of in pairs if preferred. ,In either case the processed strip permits manufacture of noble metal-tipped wipers in quantity and therefore advances the art from a manufacturing point of view. After the wipers 34 have been punched out they are formed to desired shape illustrated by the side view, Fig.
  • this bonding surface of the wiper lies entirely in the area comprising the free end including the tips 39 so that the bonding surface is of a considerably larger area than it would be if extended across the narrower portion of the wiper.
  • the bonding surface 32 lies parallel with the terminal surface 42 the pressure of the wiper against the terminal surface is exerted at substantially right angles to the bonding surface. This gives a tension effect at the bondv whereas with a conventional edge lay bond the bond surface would be substantially parallel with the direction of the forces and would put the bond in sheer stress, an inherently weaker construction.
  • the method of manufacturing sheets of composite material from which bank terminal wipers having a noble metal contacting tip and a base metal shank may be punched comprising assembling a noble metal bar of a trapezoidal crosssection with a base metal bar located against at least one of the slanting sides of said noble metal bar, bonding said bars together and rolling said composite bar lengthwise until a thin flexible sheet is obtained wherein the bonding surface between said noble metal and said base metal is at an acute angle with the plane of said sheet.
  • the method of manufacturing wipers for cooperation with bank terminals comprising assembling a noble metal bar of a trapezoidal crosssection with a base metal bar located against each slanting side of said noble metal bar, bonding said bars together, rolling said composite bar lengthwise until a thin flat flexible sheet is obtained wherein the bonding surfaces between said noble metal and said base metal are at acute angles with the plane of said sheet, punching out wipers from said sheet in pairs with the contact tips of each pair located with their ends adjacent in the noble metal area of said sheet and bending each wiper so that the bonding surface between the noble metal contact tip and the base metal shank will be located substantially parallel with the terminal surfaces over which it will travel.
  • the method of manufacturing wipers for cooperation with bank terminals comprising assembling a noble metal bar -of a trapezoidal crosssection with a base metal bar located against each of the slanting sides of said noble metal bar, bonding said bars together at the slanting sides, rolling said composite bar so that the original relation between the widths of upper and lower parallel sides of the noble metal bar is substantially retained and until a thin flexible sheet is obtained wherein the bonding surfaces between said noble metal and said base metal are at acute angles with the plane of said sheet, punching out wipers from said sheet in pairs with the contact tips of each pair located with adjacent ends in the noble metal area and with the longitudinal axis running through each pair located substantially perpendicular to the noble metal bar, and bending each wiper so that the bonding surface between the noble metal contact tip and. the base metal will be located substantially parallel with the terminal surfaces over which the wiper will travel.
  • the method of manufacturing wipers for cooperation with bank terminals comprising assembling a noble metal bar of a trapezoidal crosssection with a base metal bar located against each of the slanting sides of said noble metal bar, bonding said bars together at the slanting sides, rolling said composite bar so that the original relation between the widths of upper and lower parallel sides of the noble metal bar is substantially retained and until a thin flexible sheet is obtained wherein the bonding surfaces between said noble metal and said base metal are at acute angles with the plane of said sheet, punching out wipers from said sheet in pairs with the contact tips of each pair located with their ends connected to each other end to end in the noble metal area and with the. longitudinal axis running through each pair located perpendicular to the noble metal bar, and

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Switches (AREA)
US708855A 1943-12-20 1946-11-09 Method of making electrical contacting elements Expired - Lifetime US2458552A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE468047D BE468047A (enrdf_load_stackoverflow) 1943-12-20
GB15415/46A GB612251A (en) 1943-12-20 1946-05-21 Improvements in wipers for contacting with bank terminals in electrical switches andan improved method of manufacturing such wipers
US708855A US2458552A (en) 1943-12-20 1946-11-09 Method of making electrical contacting elements

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US51494343A 1943-12-20 1943-12-20
US708855A US2458552A (en) 1943-12-20 1946-11-09 Method of making electrical contacting elements

Publications (1)

Publication Number Publication Date
US2458552A true US2458552A (en) 1949-01-11

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US708855A Expired - Lifetime US2458552A (en) 1943-12-20 1946-11-09 Method of making electrical contacting elements

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US (1) US2458552A (enrdf_load_stackoverflow)
BE (1) BE468047A (enrdf_load_stackoverflow)
GB (1) GB612251A (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2545352A (en) * 1947-08-05 1951-03-13 George S Gibbs Method of making raised electrical contact points
US2571040A (en) * 1948-07-08 1951-10-09 Western Electric Co Method of making switch parts
US2649525A (en) * 1951-05-16 1953-08-18 Gibson Electric Company Contact
US2699597A (en) * 1950-02-07 1955-01-18 Hewlett Packard Co Method of manufacturing finger contacts
US2706760A (en) * 1951-11-09 1955-04-19 Clarostat Mfg Co Inc Variable electric control
US2734257A (en) * 1950-05-05 1956-02-14 jonsson
US2740843A (en) * 1949-02-10 1956-04-03 Int Standard Electric Corp Cross-bar commutating mechanism
US2879345A (en) * 1956-02-01 1959-03-24 Jr Donald P Mossman Selective switching apparatus
US2932880A (en) * 1955-02-24 1960-04-19 Western Electric Co Method of making electrical switching devices
US3134701A (en) * 1961-05-15 1964-05-26 Beryllium Corp Metallic product and method of manufacture thereof
US3229354A (en) * 1961-04-24 1966-01-18 Gen Electric Method of assembling a mercury button switch
US3233211A (en) * 1962-11-19 1966-02-01 Brush Beryllium Co Elongated edge bonded multi-metal strip of dissimilar alloys
US3252206A (en) * 1962-07-09 1966-05-24 Molding Engineers Inc Method of molding and forming a switch device
US3268701A (en) * 1964-04-22 1966-08-23 Alloys Unltd Inc Clad electrical contacts
US3398387A (en) * 1966-03-16 1968-08-20 Litton Prec Products Inc Inorganic brush and slip-ring assembly
US3437984A (en) * 1968-02-08 1969-04-08 Ney Co J M Probe assembly
US3893218A (en) * 1972-05-02 1975-07-08 Amerock Corp Method of mounting cabinet drawer rollers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1222999A (en) * 1916-03-20 1917-04-17 Herbert S Mills Commutator-brush.
US1378501A (en) * 1920-04-28 1921-05-17 Ashbel T Wall Pin components and method of making the same
US2373861A (en) * 1942-10-08 1945-04-17 Bell Telephone Labor Inc Method of making contact wiper springs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1222999A (en) * 1916-03-20 1917-04-17 Herbert S Mills Commutator-brush.
US1378501A (en) * 1920-04-28 1921-05-17 Ashbel T Wall Pin components and method of making the same
US2373861A (en) * 1942-10-08 1945-04-17 Bell Telephone Labor Inc Method of making contact wiper springs

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2545352A (en) * 1947-08-05 1951-03-13 George S Gibbs Method of making raised electrical contact points
US2571040A (en) * 1948-07-08 1951-10-09 Western Electric Co Method of making switch parts
US2740843A (en) * 1949-02-10 1956-04-03 Int Standard Electric Corp Cross-bar commutating mechanism
US2699597A (en) * 1950-02-07 1955-01-18 Hewlett Packard Co Method of manufacturing finger contacts
US2734257A (en) * 1950-05-05 1956-02-14 jonsson
US2649525A (en) * 1951-05-16 1953-08-18 Gibson Electric Company Contact
US2706760A (en) * 1951-11-09 1955-04-19 Clarostat Mfg Co Inc Variable electric control
US2932880A (en) * 1955-02-24 1960-04-19 Western Electric Co Method of making electrical switching devices
US2879345A (en) * 1956-02-01 1959-03-24 Jr Donald P Mossman Selective switching apparatus
US3229354A (en) * 1961-04-24 1966-01-18 Gen Electric Method of assembling a mercury button switch
US3134701A (en) * 1961-05-15 1964-05-26 Beryllium Corp Metallic product and method of manufacture thereof
US3252206A (en) * 1962-07-09 1966-05-24 Molding Engineers Inc Method of molding and forming a switch device
US3233211A (en) * 1962-11-19 1966-02-01 Brush Beryllium Co Elongated edge bonded multi-metal strip of dissimilar alloys
US3268701A (en) * 1964-04-22 1966-08-23 Alloys Unltd Inc Clad electrical contacts
US3398387A (en) * 1966-03-16 1968-08-20 Litton Prec Products Inc Inorganic brush and slip-ring assembly
US3437984A (en) * 1968-02-08 1969-04-08 Ney Co J M Probe assembly
US3893218A (en) * 1972-05-02 1975-07-08 Amerock Corp Method of mounting cabinet drawer rollers

Also Published As

Publication number Publication date
GB612251A (en) 1948-11-10
BE468047A (enrdf_load_stackoverflow) 1946-09-20

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