US2268161A - Switching device - Google Patents

Switching device Download PDF

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Publication number
US2268161A
US2268161A US308862A US30886239A US2268161A US 2268161 A US2268161 A US 2268161A US 308862 A US308862 A US 308862A US 30886239 A US30886239 A US 30886239A US 2268161 A US2268161 A US 2268161A
Authority
US
United States
Prior art keywords
contact
relay
armature
fingers
air gap
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
US308862A
Other languages
English (en)
Inventor
Alfred B Miller
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.)
Hitachi Rail STS USA Inc
Original Assignee
Union Switch and Signal 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 BE477675D priority Critical patent/BE477675A/xx
Application filed by Union Switch and Signal Inc filed Critical Union Switch and Signal Inc
Priority to US308862A priority patent/US2268161A/en
Application granted granted Critical
Publication of US2268161A publication Critical patent/US2268161A/en
Priority to FR952042D priority patent/FR952042A/fr
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
    • H01H50/56—Contact spring sets

Definitions

  • My invention relates to electromagnetic switching devices, and particularly to electromagnetic relays suitable for use in centralized traflic controlling systems for railroads, such for example, as that disclosed in an application for Letters Patent of the United States, Serial No. 31,592, filed by Clarence S. Snavely and others on July 16, 1935, for Remote control systems.
  • One object of my invention is to reduce the amount of energy required to reliably operate a relay of the type described without in any way adversely affecting the stability of the relay and its contacts.
  • a relay constructed in accordance with my invention is an improvement upon that described and claimed in Letters Patent of the United States No. 2,178,289, granted to Clarence S.
  • the relay comprises a magnetizable armature ll disposed between the pole pieces 4 of an electromagnet A which is mounted on an insulating top plate B, and a pair of vertically spaced constantly magnetized auxiliary pole pieces I2 which are secured to the underside of the top plate B through the medium of an insulating supporting bracket II.
  • the armature is moulded or otherwise secured to the upper end of a contact operating member I8 of suitable insulating material, and is adapted to be moved vertically, in response to energization of the electromagnet A, from a lower position in which its lower face engages a backstop Ila formed on a forwardly projecting tongue Hb comprising part of the bracket II, to an upper position in which its upper surface engages a pair of spaced depending front stops 2I formed on the underside of the top plate.
  • the contact operating member I8 is guided in a manner to permit the necessary movement of the armature by means of a vertical guide rod 28 and a guide pin (not shown).
  • the guide rod 28 is mounted at its upper end in an opening provided in the tongue 1 lb and at its lower end in an opening 3
  • the contact support 22 is secured at its upper end to the underside of the top plate B in a manner not shown.
  • the contact mechanism of the relay which contact mechanism embodies my present invention, comprises a plurality of vertically spaced superposed contact fingers 20 which are moulded into the opposite legs of the contact support 22 in such manner that alternate fingers are located in different legs and extend in opposite directions. These fingers extend intermediate their ends into slots
  • the reason for this arrange are each provided with contact buttons 25 of lowv resistance conducting material such as silver, which contact buttons cooperate with contact buttons 26, also of low resistance conducting material such as silver provided on the associated fixed contact members.
  • the contact fingers and fixed contact members each extend through the associated legs of the contact support, and are provided with notched or pierced outer ends to facilitate making electrical connections with the fingers and fixed contact members.
  • the ampere turns required to operate a given relay vary directly with variations in the reluctance of the magnetic circuit.
  • the reluctance of the magnetic circuit varies directly with its length. Since the air gap which must be provided between the armature and the pole pieces of theelectromagnet of a relay when the relay is deenergized forms a part of the magnetic circuit of the electromagnet, it follows that the reluctance of the magnetic circuit of a given relay, and, therefore, the ampere turns required to reliably operate the relay, decrease as the armature air gap is decreased. If the turns of the electromagnet are kept constant, then the current required to operatea given relay will vary directly as the open air gap.
  • Switching means comprising an insulating supporting member having spaced parallel legs, a plurality of flexible contact fingers moulded into said legs in superposed parallel spaced relation in such manner that alternate fingers are located in different legs and extend in opposite directions, a plurality of rigid front and back contact members moulded into said legs and each cooperating with a difierent one of said fingers, each said frontor back contact member being disposed in the leg opposite to that in which the associated finger is moulded, and means for operating said fingers operatively connected with the fingers intermediate their ends, said fixed contact members being so positioned with respect to the associated flexible contact finger that when said operating means is in its mid-stroke position each finger will just touch the associated fixed contact member, whereby the stroke of said operating means necessary to operate said contacts is reduced to a minimum.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Contacts (AREA)
US308862A 1939-12-12 1939-12-12 Switching device Expired - Lifetime US2268161A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE477675D BE477675A (cs) 1939-12-12
US308862A US2268161A (en) 1939-12-12 1939-12-12 Switching device
FR952042D FR952042A (fr) 1939-12-12 1947-08-13 Perfectionnements aux dispositifs commutateurs électro-magnétiques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US308862A US2268161A (en) 1939-12-12 1939-12-12 Switching device

Publications (1)

Publication Number Publication Date
US2268161A true US2268161A (en) 1941-12-30

Family

ID=23195699

Family Applications (1)

Application Number Title Priority Date Filing Date
US308862A Expired - Lifetime US2268161A (en) 1939-12-12 1939-12-12 Switching device

Country Status (3)

Country Link
US (1) US2268161A (cs)
BE (1) BE477675A (cs)
FR (1) FR952042A (cs)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567870A (en) * 1946-09-07 1951-09-11 Conn Ltd C G Switch for electrical musical instruments
US2639355A (en) * 1951-05-25 1953-05-19 Magnaflux Corp Electrical contact
US2838631A (en) * 1955-02-01 1958-06-10 Westinghouse Air Brake Co Electrical relays
US2864913A (en) * 1954-04-09 1958-12-16 Siemens Ag Relay contact arrangement and operation
US3828286A (en) * 1973-07-05 1974-08-06 Datron Syst Inc Miniature relay

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567870A (en) * 1946-09-07 1951-09-11 Conn Ltd C G Switch for electrical musical instruments
US2639355A (en) * 1951-05-25 1953-05-19 Magnaflux Corp Electrical contact
US2864913A (en) * 1954-04-09 1958-12-16 Siemens Ag Relay contact arrangement and operation
US2838631A (en) * 1955-02-01 1958-06-10 Westinghouse Air Brake Co Electrical relays
US3828286A (en) * 1973-07-05 1974-08-06 Datron Syst Inc Miniature relay

Also Published As

Publication number Publication date
FR952042A (fr) 1949-11-08
BE477675A (cs)

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