US2451239A - Shockproof electromagnet with armature - Google Patents

Shockproof electromagnet with armature Download PDF

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Publication number
US2451239A
US2451239A US4403A US440348A US2451239A US 2451239 A US2451239 A US 2451239A US 4403 A US4403 A US 4403A US 440348 A US440348 A US 440348A US 2451239 A US2451239 A US 2451239A
Authority
US
United States
Prior art keywords
armature
notch
core
movement
arm
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
US4403A
Other languages
English (en)
Inventor
Paul J Relfschneider
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.)
General Electric Co
Original Assignee
General Electric Co
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 BE486999D priority Critical patent/BE486999A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US4403A priority patent/US2451239A/en
Application granted granted Critical
Publication of US2451239A publication Critical patent/US2451239A/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
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/1054—Means for avoiding unauthorised release
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/1054—Means for avoiding unauthorised release
    • H01H2071/1063—Means for avoiding unauthorised release making use of an equilibrating mass

Definitions

  • My invention reiatesto improvements in electromagnetic devices and more particularly to improvements in electromagnetic devices for directly tripping circuit breakers.
  • An object of my invention is to provide a com-v pact, simple and economical electromagnetic device. Another object of my invention is to provide for circuit breakers an improved direct trip electromagnetic device which is so effectively shockproof as to avoid false tripping actions in cases of shock and the like.
  • an electromagnetic tripping device comprising'a generally U-shaped core I of suitable magnetic material.
  • the core is provided with an energizing winding 2 and a cooperating armature 3.
  • the core i is mounted on a channel-shaped supporting frame 4 by suitable fastening means such as bolts 5. These pass through the web 6 of the frame 4 into T-shaped slots I in the leg 8 of the core I and engage nuts 9.
  • suitable fastening means such as bolts 5.
  • the end of the leg II of the core i and the end of armature 'l are shown with stepped pole faces so that a short circuit-ins or shading winding, not shown, may be conveniently placed about the higher or projecting portion l3 of the core to reduce chatter as is well-known to the art.
  • a steel ring may be placed about the portion iii to reduce the air gap between the vertical faces of the poles thereby increasing the magnetic force at the open air-gap position of the arms- 4 Claims. (Cl. 175-338) 2 L- ture. as is well-known to the art.
  • An anchoring strip I4 is used to hold the coil 2 in place on the core leg ii, the lower flange I! being bent over after assembly.
  • the armature 3 has a pivotal edge l8 which, in the illustrated embodiment of my invention, is formed by the intersection of the substantially plane end and side surfaces i1 and i8 respectively of the armature. Also in accordance with my invention, I provide means'mounting the pivotal edge i8 of the armature 3 adjacent one end of the core i for angular movement of the armature toward and away from the other end of the core.
  • the angle between the end and side surfaces i1 and i8 of the armature is substantially 90, whereas the angle between the plane surfaces is and 2c forming the notch is greater than 90 by a predetermined amount suillcient to permit the desired angular movement of the armature 3 to and from the attracted position shown 'in Fig. 1.
  • I For moving the armature 3 away from the attracted position which, in the illlustrated embodiment ofmy invention, happens to be at the end of the tripping movement, I provide suitable preferably resilient energy storing means such as ,a spring 2i which is suitably connected between the web 8 of the frame 4 and a tripping arm or projection 22 mounted on the armature.
  • a spring 2i which is suitably connected between the web 8 of the frame 4 and a tripping arm or projection 22 mounted on the armature.
  • the tripping arm 22 is so arranged relatively to the trip lever 23 on the trip shaft 24 of a circuit breaker that, upon movement of the armature to the attracted position, the trip lever is turned counterclockwise to effect a similar movement of the trip shaft whereby to release the tripping mechanism, not shown, of the circuit breaker;
  • a resilient stop such as a leaf spring element 25 which, as shown, is mounted on the inside of the frame 4 near the top thereof and on an inturned flange 28. In the unattracted position of the armature, this spring element also prevents bouncing of the armature on the occurrence of shocks.
  • this means includes on the armature 3 an arm iii which can be an extension of arm 32 and which has a portion 28 of substantially circular configuration with its centeroi curvature in the pivotal edge It of the armature and of an angular extent at least equal to the desired angular movement of the armature.
  • a blocking member such as a transverse rod 23 positioned adiacent the notch intersection substantially directly above the intersection of surfaces i9 and and, as shown, extending transversely of the frame d between the sides thereof.
  • my inventionil provide means for preventing movement of the armature 3 along the face 20 of the notch in consequence of shocks and the like.
  • this means comprises a stop element such as the web 6 of the frame 4 and a cooperating pro- Jection 31 on an extension 32 of the arm 27 proexpensive and shockproof pivotal mounting for the armature of an electromagnetic device which is particularly adapted for tripping circuit breakers on war craft and the like where all apparatus on board may be subjected to violent shock conditions.
  • an electromagnetic device comprising a generally U-shaped core, an energizing winding. and an armature having a pivotal edge at one end, means mounting the pivotal edge of the armature adjacent one end of the core for angular movement of the armature toward and away from the other end of the'core comprising two intersecting plane surfaces on'the one end of the core forming a notch within which the pivotal edge of the armature is seated substantially coincidently with the line of intersection of the plane surfaces of the notch, resilient mean tending to turn the armature away from the other end of the core and having a force component tending to move the pivotally supported edge of the armature out of said notch, and means for preventing such movement of the armature including an arm onithe armature having a portion of circular configuration with its center in the pivotal edge of the arm and of an angular extent at least equal to the angular movement'of the armature, and a blocking member positioned adjacent the notch intersection and having a confin
  • any shock having a downwardly directed force component tending to lift the pivotal ed e of the armature 3 out of the notch will be inefiective to do so because 01 the stop 29.
  • the armature 3, however, will always be free to move about its pivotal edge l6.
  • an electromagnetic device comprising a generally U-shaped core, an energizing winding, and an armature having a plane end surface and a plane, side surface intersecting at an angle of substantially 90 degrees to form apivotal edge at one end, means mounting the pivotal edge of core, a spring tending to turn the armature away from the other end of the core and having a force component tending to move the pivotally supported edge of the armature out or said notch,
  • armature including an arm on the armature having a portion of circular configuration with its center in the pivotal edge of the armature and of an angular extent at, least equal to the angular movement of the armature, and a blocking member positioned adjacent the notch intersection and having a confining surface in engagement with the circular configuration of said arm during the angular movement of the armature.
  • means for preventing such movement of the armature including an arm on the armature having a portion of circular configuration with its center in the pivotal edge of the armature and of an angular extent at least equal to the angular movement of the armature, and a blocking member positioned adjacent the notch intersection and having a confining surface in engagement with the circular configuration of saidarm during the angular movement of the armature, and means for preventing movement of the armature along the other face of said notch in consequence of shocks and the like comprising a stop element and a projection on said arm engageable with said stop element.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Breakers (AREA)
  • Electromagnets (AREA)
US4403A 1948-01-26 1948-01-26 Shockproof electromagnet with armature Expired - Lifetime US2451239A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE486999D BE486999A (nl) 1948-01-26
US4403A US2451239A (en) 1948-01-26 1948-01-26 Shockproof electromagnet with armature

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4403A US2451239A (en) 1948-01-26 1948-01-26 Shockproof electromagnet with armature

Publications (1)

Publication Number Publication Date
US2451239A true US2451239A (en) 1948-10-12

Family

ID=21710623

Family Applications (1)

Application Number Title Priority Date Filing Date
US4403A Expired - Lifetime US2451239A (en) 1948-01-26 1948-01-26 Shockproof electromagnet with armature

Country Status (2)

Country Link
US (1) US2451239A (nl)
BE (1) BE486999A (nl)

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
BE486999A (nl)

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