US3383634A - Electromagnetic switch - Google Patents

Electromagnetic switch Download PDF

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Publication number
US3383634A
US3383634A US666399A US66639967A US3383634A US 3383634 A US3383634 A US 3383634A US 666399 A US666399 A US 666399A US 66639967 A US66639967 A US 66639967A US 3383634 A US3383634 A US 3383634A
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US
United States
Prior art keywords
armature
core
switch
passage
housing
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
US666399A
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English (en)
Inventor
Bauer Franz
Preissler Karl
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Individual
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Individual
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Publication date
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Publication of US3383634A publication Critical patent/US3383634A/en
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    • 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
    • H01H50/643—Driving arrangements between movable part of magnetic circuit and contact intermediate part performing a rotating or pivoting movement
    • 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
    • H01H50/20—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil
    • H01H50/22—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil wherein the magnetic circuit is substantially closed

Definitions

  • ABSTRACT F THE DISCLOSURE An electromagnetic switch whose core and armature have opposite pole faces in the passage of the magnetic Winding in which they are axially movable, the winding, armature, and core being enveloped in plastic except for the pole faces, and the clearance between the slidably engaged axial plastic surfaces permitting tilting movement of core and armature for full area contact between the pole faces.
  • a lever pivoted on the switch housing is engaged by stub shafts on the armature envelope with sufficient clearance for rectilinear axial armature movement during the contact-opening or closing angular movement of the lever.
  • the object of the instant invention is the provision of a switch of the general type disclosed in the afore-cited patent whose mechanical elements may largely consist of an injection-molded thermoplastic resin composition with the usual generous tolerances required for such moldings, and yet not subject to the rapid wear which is caused in known switches by misalignment of low precision parts.
  • FIGURE 2 is a front-elevational view of the switch of FIGURE l in section on the line II-II, the contact arrangement having been omitted;
  • FIGURE 3 shows the apparatus of FIGURE 1 without the top part of its housing and associated magnets in plan view.
  • the structure described so far consists entirely of plastics, preferably nylon.
  • the front and back of the housing 1 are generally open, and the side walls are connected above the contacts 18, 19 by transverse reinforcing bars 40, 42 in which metallic tie rods 43 are embedded.
  • An upper housing part 50 having the shape of an upwardly open box rests on the transverse bar 40 to which it is xedly attached.
  • the housing part 50 has a dat, horizontal bottom wall 51, side walls 52, and a front wall 53. It is rearwardly partly open, as is best seen in FIG. 3.
  • Two elongated troughs 54 extend along the tops of the side walls 52 with which they are integral.
  • the longitudinal end walls 55 of the troughs 54 have slots 55', 55",
  • the box-shaped housing part t) accommodates the magnet assembly 60 of the switch.
  • Each of two windings 62 of the assembly 60 has the shape of a ring about a horizontal axis in which corresponding parts of the armature 64 and of the core 65 are axially guided, as will presently be described in more detail.
  • the armature 64 consists of laminated ferrous material, as is conventional, the pack of metal sheets being partly embedded in a nylon envelope 72.
  • Stub shafts 73 integral with the envelope 72 coaxially project from the same into loosely fitting openings in the rocker arm 68, not themselves visible in the drawing.
  • the metal sheets of the armature have approximately aligned openings filled with a rod 74 of the plastic envelope during the same injection molding operation in which the envelope 72 and the stub shafts 73 are formed.
  • the windings 62 are also embedded in a nylon shell 75 which lines the guide passages for the armature 64 and the core 65.
  • Each winding 62 is secured against excessive movement along the passage axes by projections 82, 83 on the hollow cover 90 of the housing 1, and a similar projection 85 on the front wail 53 of the housing part 50 limits movement of the core 65 to a clearance a between the projection and the core of about 0.2-0.4 mm. in a direction away from the armature 64, and a clearance b between the core and the arm 80 of about 0.5 mm. in a direction toward the armature.
  • the transverse clearance of the core in the passages of the windings 62 is about 0.1 to 0.5 mm.
  • the transverse clearance of the windings 62 in the switch housing is practically zero.
  • the cover 90 accommodates the switch for a pilot lamp, not shown, which indicates whether the switch is opened or closed, only the actuating member 91 of the auxiliary switch being shown in engagement with a lug 92 on the rocker arm 66 under the pressure of a non-illustrated .4 biasing spring.
  • the arm 66 is formed with an opening aligned with the armature 64 for assembly purposes which is normally closed by a plug 93.
  • the several parts of the housing all of which consist of nylon or other thermoplastic material, are fastened to each other adhesively or otherwise.
  • the armature 64 moves toward the left, as viewed in FIG. 1, while the core 65 simultaneously moves toward the right as far as permitted by the very slight resilient deformation of the arms 80.
  • the path of the core is greater than the transverse clearance of the armature and the core in the passage of the winding 62, considering the nylon envelopes '72, 75, but is still only a small fraction of the greatest transverse dimension of the passage.
  • the relatively stiff arms absorb the initial impact of the core 65 until the core is engaged by the moving armature 64 and moves jointly with the latter against the projection of resilient plastic.
  • the rebound of the movable elements from the resilient plastic material of the projection 85 and of the arms 80 causes brief oscillations which are quickly damped by internal friction in this material and in the plastic envelope 75 of the core 65.
  • the windings 62 are energized by alternating current which causes cyclic variations in the magnetic attraction of the core 65 and the armature 64, the oscillatory movement of the core with the armature is damped quickly enough to prevent the separation of the pole faces which maintain engagement over their entire surface. T-here is no chattering.
  • the long useful life of the magnetic switches of the invention is due in part to yabsence of chattering between metallic parts which abuttingly engage each other during operation of t-he switch, and partly by the provision of plastic coatings or envelopes on the surfaces of the magnet assembly which slidingly engage each other under. Although these envelopes operate normally at somewhat elevated temperatures, significant wear has not been observed on the frictionally engaged sliding surfaces.
  • the dimensions of the plastic elements of the aforedescribed magnetic switch are not critical, and the clearances indicated above by way of example need not be maintained with any precision.
  • the switch is readily assembled from relatively few parts which are fastened to each other by engagement of mating projections and recesses, or by other conventional means well within the skill of untrained personnel. The assembled switch does not require adjustment prior to being installed. The switch is thus assembled at low cost from materials which may be very inexpensive, with the possible exception of the contacts i8, 19.
  • the switch is practically immune to the deteriorating influence of air and of airborne corrosive materials, and is not atfected by changes in ambient relative humidity which may cause the plastic parts to underH go dimensional changes.
  • the contacts l, 19 are engaged when the magnet windings 62 are energized, and they remain engaged until the windings are deenergized. There being no chat tering between the armature ⁇ 64 and the core e5, an important cause of arcing at the contacts is eliminated, and the life of the contacts is greatly extended.
  • nylon is the preferred material of construction for all elements of the switch assembly
  • an electromagnetically operated switch assembly having a housing, a magnet winding mounted in said housing, said winding defining a passage having an axis, a magnetic circuit including a core member of ferromagnetic material having a flat poie face extending transversely of said axis, a portion of said core member being received in said passage, and an armature member of ferromagnetic material having a flat pole face opposite the pole face of said core member, a contact assembly movable between a circuit closing and a circuit opening position, and motion transmitting means operatively interposed between said armature member and said contact assembly for moving the latter between said positions thereof in response to movement of said armtaure member toward and away from the pole face of the core member, the lmotion transmitting means including a lever member pivotaily mounted on said housing, and said contact assembly moving ti from one to the other of said positions in response to a predetermined angular movement of said lever member, the improvement which comprises:

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Breakers (AREA)
US666399A 1964-06-03 1967-09-08 Electromagnetic switch Expired - Lifetime US3383634A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT478764A AT257731B (de) 1964-06-03 1964-06-03 Magneteinrichtung für fernsteuerbare Schaltgeräte

Publications (1)

Publication Number Publication Date
US3383634A true US3383634A (en) 1968-05-14

Family

ID=3568323

Family Applications (1)

Application Number Title Priority Date Filing Date
US666399A Expired - Lifetime US3383634A (en) 1964-06-03 1967-09-08 Electromagnetic switch

Country Status (10)

Country Link
US (1) US3383634A (xx)
AT (1) AT257731B (xx)
BE (1) BE663696A (xx)
CH (1) CH444266A (xx)
DE (1) DE1540220B1 (xx)
DK (1) DK119712B (xx)
ES (1) ES313679A1 (xx)
GB (1) GB1078344A (xx)
NL (1) NL150607B (xx)
SE (1) SE333598B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3708769A (en) * 1970-10-22 1973-01-02 Ghisalba Spa Electromagnetic contactor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1726391A (en) * 1925-08-31 1929-08-27 Gen Electric Electromagnetic operating means
US3251964A (en) * 1963-12-26 1966-05-17 Allen Bradley Co Electromagnetic relay with readily demountable parts

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE950391C (de) * 1938-10-11 1956-10-11 Siemens Ag Elektromagnetisches Geraet
DE1693312U (de) * 1954-10-04 1955-02-17 Wilhelm Binder K G Hubmagnete und sonstige mit erregerspulen versehene elektromagnet-geraete mit durch giessmasse umgossener spule.
DE1138141B (de) * 1958-07-29 1962-10-18 Weyer & Zander K G Formschluessige elastische Verbindung zwischen Magnetanker und Schaltbruecke eines Luftschuetzes
DE1094365B (de) * 1958-08-14 1960-12-08 Bbc Brown Boveri & Cie Traeger fuer das nachgiebige und gedaempfte Halten des nichtschaltenden Kernes einesSchaltmagneten
US2977438A (en) * 1959-06-29 1961-03-28 Morschel Franz Relay-contactor
GB922034A (en) * 1960-10-20 1963-03-27 Christian Burkert Improvements in or relating to electromagnetically-operated fluid valves

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1726391A (en) * 1925-08-31 1929-08-27 Gen Electric Electromagnetic operating means
US3251964A (en) * 1963-12-26 1966-05-17 Allen Bradley Co Electromagnetic relay with readily demountable parts

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3708769A (en) * 1970-10-22 1973-01-02 Ghisalba Spa Electromagnetic contactor

Also Published As

Publication number Publication date
BE663696A (xx) 1965-09-01
AT257731B (de) 1967-10-25
NL6506861A (xx) 1965-12-06
CH444266A (de) 1967-09-30
DK119712B (da) 1971-02-15
SE333598B (xx) 1971-03-22
NL150607B (nl) 1976-08-16
GB1078344A (en) 1967-08-09
DE1540220B1 (de) 1971-11-11
ES313679A1 (es) 1966-02-16

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