US2821598A - Electromagnetic switches - Google Patents

Electromagnetic switches Download PDF

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Publication number
US2821598A
US2821598A US451374A US45137454A US2821598A US 2821598 A US2821598 A US 2821598A US 451374 A US451374 A US 451374A US 45137454 A US45137454 A US 45137454A US 2821598 A US2821598 A US 2821598A
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US
United States
Prior art keywords
interference
magnet
movement
finger
actuator
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
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US451374A
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English (en)
Inventor
Rommel Frederick Emil
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.)
Telephone Manufacturing Co Ltd
Original Assignee
Telephone Manufacturing Co Ltd
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Filing date
Publication date
Application filed by Telephone Manufacturing Co Ltd filed Critical Telephone Manufacturing Co Ltd
Application granted granted Critical
Publication of US2821598A publication Critical patent/US2821598A/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
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/24—Parts rotatable or rockable outside coil
    • H01H50/26—Parts movable about a knife edge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H67/00—Electrically-operated selector switches
    • H01H67/22—Switches without multi-position wipers
    • H01H67/26—Co-ordinate-type selector switches not having relays at cross-points but involving mechanical movement, e.g. cross-bar switch, code-bar switch

Definitions

  • inventiom relates. tos electrornagnetic ⁇ switchesV of the type employing a plurality of contact-sets, ⁇ apreselector: or so+callcd'fnger magnet pertaining to each contact; sett; andea maintoperaftingmagnet.
  • the .interference .piecemustibe made sol astobe capable; of: substantially independent motions inftwo dilfectitns, ⁇ in; response. ⁇ to theL fingen magnet and to the maimrna-gnetfrespectively, butfatftheisame time any-movemont; which would. give r-isefto. incorrect-operation of ⁇ the ewitch mustrbe avoided'.
  • lig'ure.r 4 ⁇ isf al fragmentary .section onl the line x-.x of Figure 2;
  • EigureA 6 is an endview, on. an. enlarged. scale,v of the armatureandrinterfereneepieee Qf FigureS;
  • this baseplate has an. upwardly turned jange '10a which. Supports three. finger magnets. 11,; these masr'retshave dores llwhichare screwedinmandthrdush ange lila and there held by. l'ockrnitsl 1g; As willv be seen,v these magnets lie with their cores parallel to each otherv and to the bvaseplate. At the.
  • ange- 10a At.- the sameY endf of they baseplate as ange- 10a is a fur-thenange'. 10d-g which servesito, carryy a main magnet; the maimmagnetcomprises a core t7 which. is butt welded to flange 10d; and upon. which is they operating coilf 20. "Ihegcoili is helda imposition on the ⁇ core by an internally .tQO.thedrspringI clip 2l; The armature for-thetmainmagnet includes. a; rectangular.,v elementl 22. of soft iron. ⁇ mounted uponv a carrier ⁇ 2133having a; substantially'venticalat.
  • the assembly includes a mounting block 33 which is secured to the guide block 31 by screws 34, and sets of both stationary and moving contacts carried on this mounting block.
  • the stationary contacts 35 are clamped in a stack of insulating spacers 36 and the moving contacts 37 are carried but not necessarily clamped in this stack.
  • the stack is clamped to the mounting block by screws 38.
  • the moving contacts of each set are operated by a card 40; as shown there are seven sets of contacts each with its card.
  • the moving contacts of each set enter slots in the edges of the card, and the cards are guided at their upper ends by means of a tongue-d spring plate 41, which provides a light downward bias pressure on the cards, and at their lower ends by a relatively rigid plate 42 secured to block 33 by screws 43.
  • the contact assembly forms a separate unit which can be attached to or removed from the rest of the switch, by means of the screws 34.
  • each finger magnet 11 has an armature which includes an armature element 44 and a spring arm 45, the latter carrying an interference piece 46, while the armatures of finger magnets 14 have correspondingly an element 47 and spring arm 48, the latter carrying an interference piece 50.
  • the interference pieces lie to one side of the actuator 30, as shown in Figure 2, the interference pieces 46 lying to the right and the interference pieces 50 to the left of the actuator.
  • each interference piece is limited in its upward movement by the lower edge of the card 40, and in its downward movement by the surface of the guide block 31 upon which it normally rests.
  • the upper surface of the guide block 31 is provided with a series of recesses or grooves 31a, one for each of the interference pieces 46, and corresponding recesses or grooves 31b for interference pieces 50.
  • the lower part of the interference pieces is located, at all times, between the side walls of these recesses and so the interference pieces are likewise limited against movement in the direction at right angles to the interfering and, in this case also, the actuating direction, Since the recesses 31a and 31b have closed ends, the movement of the interference pieces in the interfering direction is also limited.
  • the guide blocks 31 are also formed with webs 31e which lie between the adjacent armatures.
  • the armature elements of the finger magnet armatures are arranged to provide the necessary pivotal mounting for the armatures.
  • the elements 44 or 47 are identical in construction through transposed in position in assembly and consist of a rectangular strip of soft iron of which one end is machined to a knife edge as shown at 44a and 37a in Figures 4, 5 and 6.
  • the baseplate is formed with two series of depressions 10e, 101, the depressions 10e for knife edges 44a and 10f for 47a.
  • the depressions 10e are in line, and 10]c are likewise in line, and the two lines are parallel with each other.
  • each row of depressions can be formed as a single elongated depression, but the separate depressions are preferred. Itis convenient to form the depressions by a pressing operation, in which case a hole may be formed in the metal before the pressing operation in order that the metal may iiow more easily.
  • spring arms 45 and 48 are also similar in shape, and are formed as stampings of spring material, such as Phosphor bronze or brass.
  • spring 45 has a at portion 45a which lies against that face of the armature element 44 which is adjacent the core of the finger magnet, and a flange 45b along each edge to increase the stiffness of the spring.
  • the spring is secured to its element by three small rivets 51. From the bottom edge of the flat portion 45a of the spring extend two small fingers 45C at right angles.
  • each interference piece as shown in Figure 7 as a short cylinder with a ange at one end and an intermediate narrow circumferential groove 46a.
  • the end of each extension has a hole in it, with a slot leading from the hole to the end of the extension.
  • the groove in the interference piece allows the latter to enter the slot and hence the hole, and the interference piece is then deformed endwise to cause it to be firmly and permanently clamped on the extension, and at the same time dimensioned within a close tolerance in the actuating direction.
  • each armature member 45 or 48 supports the associated interference piece 46 or 50 with sufficient flexibility to allow it to be moved easily in the actuating direction, and also the interference piece to rest with light pressure on top of the guide block 31 in the energised condition of the finger magnet.
  • This latter is an advantage because, as explained above, the contact assembly can be removed as a unit; this assembly includes the cards 40. When the contact assembly is removed in this way the interference pieces will continue to rest in position upon the guide block, and replacement of the assembly is facilitated.
  • the interference pieces are moved in two directions, the interfering direction and the actuating direction, as defined above.
  • the interfering direction is from left to right or right to left as seen in the view of Figure 4, while the actuating direction is up and ,down in this figure; clearly the interference piece must be capable of motion in these two directions.
  • this freedom of movement is not in itself sufficient and it must be arranged that no damage will result if the main magnet is operated first, or if its operation is followed instead of preceded by the operation of the finger, and there must be no danger of incorrect operation of the switch in these circumstances.
  • the mounting of the interference piece on the resilient part of the finger magnet armature, thereby to permit the necessary movement in at least the actuating direction, is advantageous in this respect, but the danger would then normally arise that the interference piece if it moves excessively by the resilience of its carrier may foul some part of the switch and might not be drawn by the finger magnet into the correct position, and ncorrect actuation would result.
  • each interference piece is limited in its movement not only in the actuating direction when it is moving in the interfering direction, but also in the direction at right angles to the actuating direction.
  • the finger magnet armature moves its associated interference piece in the interfering direction, but in this movement, notwithstanding the flexibility of its support the interference piece is wholly guided, and it cannot escape from a prescribed path extending between the interfering and non-interfering positions.
  • the invention provides a construction of switch which is relatively cheap to manufacture, and of reliable operation.
  • An electromagnetic switch device comprising a main operating magnet, a contact set, an operator for the contacts of the contact set, a finger magnet having an armature carrying an interference piece arranged to be moved in an interfering direction upon operation of said finger magnet so as to be interposed between said operator and an actuator arranged to be moved in an actuating direction by the armature of sai-d main magnet, and guide means providing guide surfaces eiective over the range of movement of said interference piece in the interfering direction to limit movement of said piece in directions at a substantial angle to the interfering direction without impeding movement of said piece in the interfering direction.
  • An electromagnetic switch device as defined in claim l wherein said operator has a substantially straight edge arranged substantially parallel to a guide surface provided by said guide means to define a guide space in which said interference piece is constrained to move.
  • said guide means includes a member providing a guide surface extending over the range of movement of said interference piece, said member being provided with a recess therein to receive said interference piece.
  • said guide means includes a member providing a guide surface extending over the range of movement of said interference piece, said member being provided with an elongated aperture therein providing an interruption in said guide surface, sai-d actuator being arranged to be moved through said aperture upon operation of said main magnet.
  • An electromagnetic switch device as defined in claim 4 wherein said member is provided with a recess therein to receive said interference piece, said recess extending across said elongated aperture at a substantial angle thereto.
  • An electromagnetic relay comprising a plurality of contact sets, an operator for the contacts of each of said contact sets, said operators being arranged in a row, a guide block below said row of operators, said guide block having a plurality of transverse, parallel spaced guide grooves located respectively in alignment with said operators and a second vertical groove extending at a right angle to said guide grooves and intersecting the same, said second groove extending in the direction of said row of operators, a main operating magnet, an actuator member disposed in said second groove of said guide block and movable upwardly upon energization of said main operating magnet, a plurality of finger magnets corresponding respectively to said plurality of contact sets, each of said finger magnets having an armature member actuated thereby and an interference piece carried by each armature, said interference pieces being received respectively by and slidably guided in said transverse guide grooves from a position to one side of said second groove and actuator when the corresponding finger magnet is unenergized to a position between said actuator and the corresponding operator when said finger magnet is energize

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
US451374A 1953-08-24 1954-08-23 Electromagnetic switches Expired - Lifetime US2821598A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23285/53A GB781851A (en) 1953-08-24 1953-08-24 Improvements in and relating to electromagnetic devices

Publications (1)

Publication Number Publication Date
US2821598A true US2821598A (en) 1958-01-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
US451374A Expired - Lifetime US2821598A (en) 1953-08-24 1954-08-23 Electromagnetic switches

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US (1) US2821598A (en(2012))
BE (2) BE531358A (en(2012))
GB (2) GB781851A (en(2012))

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476789A (en) * 1944-03-13 1949-07-19 Ericsson Telefon Ab L M Contact selecting finger for crossbar switches
US2553517A (en) * 1946-02-15 1951-05-15 Isserstedt Siegfreid Gordon Electrical remote control
US2630500A (en) * 1949-12-08 1953-03-03 Telephone Mfg Co Ltd Electric contact making device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476789A (en) * 1944-03-13 1949-07-19 Ericsson Telefon Ab L M Contact selecting finger for crossbar switches
US2553517A (en) * 1946-02-15 1951-05-15 Isserstedt Siegfreid Gordon Electrical remote control
US2630500A (en) * 1949-12-08 1953-03-03 Telephone Mfg Co Ltd Electric contact making device

Also Published As

Publication number Publication date
BE531359A (en(2012))
BE531358A (en(2012))
GB781851A (en) 1957-08-28
GB781852A (en) 1957-08-28

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