US2620416A - Moving contact of electric switches - Google Patents

Moving contact of electric switches Download PDF

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Publication number
US2620416A
US2620416A US73833A US7383349A US2620416A US 2620416 A US2620416 A US 2620416A US 73833 A US73833 A US 73833A US 7383349 A US7383349 A US 7383349A US 2620416 A US2620416 A US 2620416A
Authority
US
United States
Prior art keywords
contact
strip
carrier
moving contact
contacts
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
US73833A
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English (en)
Inventor
Besag Ernst
Thomas D G Wintle
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.)
JA Crabtree and Co Ltd
Original Assignee
JA Crabtree and Co Ltd
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 JA Crabtree and Co Ltd filed Critical JA Crabtree and Co Ltd
Application granted granted Critical
Publication of US2620416A publication Critical patent/US2620416A/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
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/546—Contact arrangements for contactors having bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts

Definitions

  • the contact is made of the thinnest metal commensurate with its conductance, that is, the contact is of an adequate cross section to carry the requisite current, the physical strength to compensate for this thinness being imparted by the structural modifications in the form of flanges, ribs or the like.
  • the provisions of these formations enables the employment of a relatively soft metal, such as copper, which constitutes an efiicient conductor.
  • the contact strip of an electric motor starting switch adapted to carry 15 amps the thickness of the metal thereof has hitherto been of the order of .080 and an overall width of .300, this width being required for accommodating the silver contact buttons mounted on the contact strip.
  • the contact strip for such a switch will have a thickness of only about .018".
  • the improvements of the present invention enable the contacts to be employed for increased current values without impairing their efficiency. Also the life of the contacts is increased and, hence, the necessity for their renewal and. replacement is reduced.
  • the production of the moving contacts from thin sheet metal with strengthening formations thereon also provides a large surface area in relation to mass, for the purpose of enhancing the dissipation of heat.
  • Figure 1 is a perspective view.
  • Figure 2 is a sectional perspective View with parts disassembled.
  • Figure3 is a sectional elevation, the chain lines indicating the fixed contacts and associated parts.
  • Figure 4 is a section on the line IVIV of Figure 3.
  • Figure 5 is a section on the line VV of Figure 3.
  • Figure 6' is a perspective view of a modified construction of moving contact.
  • Figures 2-6 are drawn to a larger scale than Figure l.
  • the insulating carrier a has three vertical recesses a in each of which is mounted a moving contact b having riveted to each end thereof a silver button 0 for engagement with a fixed contact d.
  • Each moving contact 12 is formed from a thin narrow strip of metal having its longitudinal edges bent to form flanges e which impart stiffness and strength to the strip, and which provide a contact of channel section.
  • the external flat faces of these flange e aiiord smooth guiding engagement of the contact with the side walls of the chambers or recesses a
  • flat stems f extend freely through the contact I), and constitute mountings for helical compression springs 9.
  • Each stem may be in the form of a flat arrow having the spring g coiled around its reduced part.
  • the head f is passed through a slot 1' in the casing while said head is disposed horizontally as shown in the upper part of Figure 2.
  • the stem ,1 is then turned to the vertical position shown in the lower half of Figure 2, and its head i is passed through a keyhole slot 7c in the contact, after which it is turned again to the horizontal position thus securing the contact I) resiliently to the carrier a.
  • Each contact 12' may be formed with a bulge or bow b in the neighbourhood of a keyhole slot is.
  • the contact strip 22 is formed with downturned flanges m at its opposite ends, in addition to the flanges e at the sides of said strip.
  • These end flanges m may constitute abutments for leaf or blade springs received in the channel formed by said flanges.
  • the flanges e and m may be formed by bending the strip b or by a drawing operation.
  • the strip may be provided with a dishing extending along a central longitudinal line.
  • other raised formations may be provided for the same purpose.
  • a pair of spaced stationary contacts a pair of spaced stationary contacts; an insulating armature carrier mounted between said contacts for reciprocation into and out of contact-closing position with the top and bottom of said carrier spaced inwardly of said contacts; an elongated, light, contact strip of thin sheet metal having strengthening formations thereon; and means for resiliently mounting said contact strip on the front face of the armature carrier with the end portions of said contact strip extendin above and below the front face of said carrier and in alinement with said stationary contacts, said means comprising a stem connected to said strip and extending through the front wall of the carrier,
  • a pair of spaced stationary contacts an insulating armature carrier mounted between said contacts for reciprocation into and out of contaot-c1osing position with the top and bottom of said carrier spaced a inwardly of said contacts; a contact strip; and means for resiliently mounting said contact strip on the front face of the armature carrier with the end portions of said contact strip extending above and below the front face of said carrier and in alinement with said stationary contacts, said means comprising a stem connected to said strip and extending through the front wall of the carrier, and a compression spring surrounding said stem and acting between the inner end thereof and the inner surf-ace of the front wall of said carrier to resiliently maintain said strip in contact with the front face of said carrier.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Push-Button Switches (AREA)
US73833A 1948-04-24 1949-01-31 Moving contact of electric switches Expired - Lifetime US2620416A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11332/48A GB642622A (en) 1948-04-24 1948-04-24 Improvements in and connected with moving contacts of electric switches

Publications (1)

Publication Number Publication Date
US2620416A true US2620416A (en) 1952-12-02

Family

ID=9984305

Family Applications (1)

Application Number Title Priority Date Filing Date
US73833A Expired - Lifetime US2620416A (en) 1948-04-24 1949-01-31 Moving contact of electric switches

Country Status (5)

Country Link
US (1) US2620416A (xx)
BE (1) BE488398A (xx)
FR (1) FR984257A (xx)
GB (1) GB642622A (xx)
NL (1) NL146071C (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2819366A (en) * 1956-05-11 1958-01-07 William Wesley Hicks Thermostatic switch
US3004127A (en) * 1957-09-16 1961-10-10 Crabtree & Co Ltd J A Contacts for electric switches
DE1202879B (de) * 1957-04-24 1965-10-14 Licentia Gmbh Elektrisches Schaltegraet mit U-foermigem, ueberbrueckendem Kontaktbuegel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675448A (en) * 1951-04-07 1954-04-13 Bendix Aviat Corp Electrical apparatus
DE1135989B (de) * 1960-10-14 1962-09-06 Telefunken Patent Schalter, insbesondere Schiebeschalter mit Kurzschlusskontakten fuer Nachrichtengeraete
FR2538037B1 (fr) * 1982-12-21 1987-04-17 Paris & Du Rhone Axe composite de contacteur electromagnetique de demarreur electrique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1362379A (en) * 1920-12-14 Electric switch
US1809368A (en) * 1929-06-10 1931-06-09 Clum Mfg Company Ignition switch, contact carrier and actuator
US2211412A (en) * 1940-01-02 1940-08-13 Filko John Breaker arm for ignition devices
US2276698A (en) * 1939-09-30 1942-03-17 Westinghouse Electric & Mfg Co Contactor
US2359605A (en) * 1941-11-08 1944-10-03 Fed Electric Prod Co Resilient removable contact member

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1362379A (en) * 1920-12-14 Electric switch
US1809368A (en) * 1929-06-10 1931-06-09 Clum Mfg Company Ignition switch, contact carrier and actuator
US2276698A (en) * 1939-09-30 1942-03-17 Westinghouse Electric & Mfg Co Contactor
US2211412A (en) * 1940-01-02 1940-08-13 Filko John Breaker arm for ignition devices
US2359605A (en) * 1941-11-08 1944-10-03 Fed Electric Prod Co Resilient removable contact member

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2819366A (en) * 1956-05-11 1958-01-07 William Wesley Hicks Thermostatic switch
DE1202879B (de) * 1957-04-24 1965-10-14 Licentia Gmbh Elektrisches Schaltegraet mit U-foermigem, ueberbrueckendem Kontaktbuegel
US3004127A (en) * 1957-09-16 1961-10-10 Crabtree & Co Ltd J A Contacts for electric switches

Also Published As

Publication number Publication date
NL146071C (xx)
FR984257A (fr) 1951-07-04
GB642622A (en) 1950-09-06
BE488398A (xx)

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