US1750895A - Automatic circuit breaker - Google Patents

Automatic circuit breaker Download PDF

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Publication number
US1750895A
US1750895A US266089A US26608928A US1750895A US 1750895 A US1750895 A US 1750895A US 266089 A US266089 A US 266089A US 26608928 A US26608928 A US 26608928A US 1750895 A US1750895 A US 1750895A
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United States
Prior art keywords
switch
coil
magnet
contacts
contact
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Expired - Lifetime
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US266089A
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English (en)
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Leyhausen Wilhelm
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Individual
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Individual
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/48—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having both electrothermal and electromagnetic automatic release
    • H01H73/56—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having both electrothermal and electromagnetic automatic release reset by push-button, pull-knob or slide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/36—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electromagnetic release and no other automatic release
    • H01H73/44—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electromagnetic release and no other automatic release reset by push-button, pull-knob or slide

Definitions

  • the invention has further for its object to arrange the automatic switches in such a manner that the thermic releasing device, provided on the switches besides the electromagnetic releasing device, can be made to operate at different normal current-intensities.
  • Figs. 1 and 2 show each the switch in vertical section, Fig. 1 in the cut-in position and Fig. 2 in the cut-out position.
  • Fig. 3 is a horizontal section taken just above the partition.
  • Figs. 4 and 5 show a modified closure for the aperture in the partition in two different. positions.
  • Figs. 6 and 7 show each the switch in a vertical section in the cut-in and cut-out positions respectively.
  • Fig. 8 is a top-plan-view of the same, the lid of the casing being removed.
  • Fig. 9 is a vertical section through the switch, one of the switch arms being shown in elevation in Figs. 10 to 12, an excess cur- 85 rent-switch is shown in section, comprising a modified releasing device and push-buttons for switching on and off.
  • Figs. 10 and 11 show the switch in the cut-in and cut-out positions respectively.
  • Fig. 12 shows the releasing device in elevation viewed in the direction of the switcharm.
  • Fig. 17 shows diagrammatlcally a variable thermal releasing device by way of example.
  • a disk 3 is arranged in the lower part 1 of the casing 1, 2 which carries the magnet and blowing coil 4 with a plunger armature 5.
  • a horizontal partition 22' of insulating material is mounted which has at the centre an opening 23 and two apertures 24, 24 near the edge.
  • the two-armed contactarms 8, 9 are pivotally mounted.
  • a roller 12 of insulating material is arranged, a disk-6 on the end of the plunger armature 5 being disposed between these two rollers 12, 12.
  • the upper arms 8, 8 extend through the apertures 24, 24 of partition 22 and their contacts 10, 11 engage each other above the opening 23, when the switch is in the position ready for use.
  • springs 16 are wound which press the rollers 12 against disk 6. When excess current occurs, the plunger armature 5 is attracted by the magnet-coil 4.
  • a push-button 18 serves for closing thecircuit. It is controlled by a spring 19. From the push-button extends the downwardly directed switch-rod 20 which fits in the opening 23. When the push-button 18 is depressed the switch-rod 20 pushes the armature 5 downwards into the cut-in position. The contacts 10, 11 are thereby returned to normal osition so that their contact portions ear against the switch-rod and come into engagement as soon as the push-button has returned into its initial position. If at this time,however, the circuit is 'still overloaded another cut-out action will take place instantaneously, as will be readily understood.
  • the descending movement of the plunger armature 5 is limited by an adjusting screw 14 screwed'through a bush 13 and by means of which the switch is adjusted to the desired intensity of releasing current.
  • an insulating piece 15 on the top-end of the same closes the opening 23 in the partition 22 so that the are formed between the contact portions of the contacts 10, 11 will be confined to the top part of the casing and prevented from reaching the coil. 4
  • gs. 4 and-5 show a modified construction of closure for the opening 23 of partition 22 in two difierent positions.
  • a disk 17 is pressed by the pressure of a spring 21 from below into the opening 23 and .normally closes the same.
  • the switch-rod 20 pushes the disk 17 against the plunger armature 5 and'depresses Above the coil.
  • the partition 22 separates-the arc space or chamber 25 from the coil and from the releasing device.
  • the excess current-switch shown in Figs. 6 to 9 differs from that shown in Figs. 1 to 3 in that the magnet-coil 4, in which an auxiliary, stationary armature 39 is mounted is enclosed by a capsule 26 and thatthe closing of the contacts 10, 11 is carried out by means of a stud 27 of a foot-contact.
  • the capsule 26 is mounted on the disk 3.
  • the two-armed contact-arms 8, 9, pivotally mounted on the axles 7, 7, are connected with one another by a toggle-lever 28, 29, the arms of which are oscillatably mounted on a common bolt 30. On this bolt 30 acts the plunger armature 5.
  • the lever-arm 28 is made 0t insulating material.
  • stud 27 To return the switch into the cut-in position stud 27 must be pulled down. To this stud 27 a rod 31 is connected, the upper end of which has a longitudinal slot 32 engaging over the pivot-bolt 30. A spiral-spring 33 wound around rod 31, the lower end of said spring resting on a plate 34 and the upper end pressing against a pin 35 fixed in rod 31, serves to hold this rod in the raised position limited by a collar 36. On the pulling down of stud 27 the toggle-lever 28, 29 is stretched again.
  • a vertical partition 37 is mounted so that channels 38 are formed which completely enclose the arms.
  • the magnet-coil acting upon the plunger armature 5 is enclosed by a capsule 26.
  • an elbow-lever 41 is hingedly connected by means of an axle 40, said elbow-lever being oscillat-ably mounted on a stationary stud 42 and controlled by dead centre-springs 50, attached at the one end to a transverse pin 43 of lever 41 and at the other end to stationary holding arms 44.
  • a locking disk 45 is rotatably mounted which has a stationary contact 51.
  • notch 46 through which the pin 43 extends.
  • the notch is, however, wider than the pin 43 is thick, so that a side wall of the notch will normally be spaced from the pin and will be brought to bear against said pin only after a certain part-rotation of the disk.
  • the edge of disk 44 bears against a transverse pin 47 of a two-armed lever 49, pivotally mounted on a pivot-pin 48. WVhen the disk is in the position described, the lever 49 presses the movable spring contact 52 against the The switch is then in the switching-on position shown in Fig. 10.
  • the push-button 53 is depressed against the action of its spring 54. With this button 53 a separating element 55 is connected which stands transversely to the contacts 51 and 52. This separating element 55 when descending acts upon a shiftable rod 56 which has at the lower end a slot 57 indicated in dash-dot-lincs engaging over a bolt 60 of the elbow-lever 41. On the depression of the push-button 53 the elbow-lever 41 is therefore moved back beyond its dead centreposition and then returned by the action of the springs 50 into the position shown in Fig. 10. The locking disk 54 is rotated backward and pushes the lever 49 into the initial position and tries to press the contact-spring 52 against the stationary contact 51, this being however prevented by the lowered separating element 55.
  • a push-rod 59 is pressed by the action of a spr1ng (not shown), said push-rod car- 'rying on the top-end a push-button 58.
  • This push-button executes the same cutting-in and out "movements as the lever 41 and it is ob vious that, by depressing the push-button 58, the switch member 52 may at any time be shifted to cut out position.
  • Fig. 17 An arrangement which permits regulation of the thermal-releasing device of the switch to act at different nominal current-intensities is shown in Fig. 17.
  • the current flows through the wire 61 into'the coil 4 which encloses the plunger armature 5.
  • a wire 62 leads to abimetal strip 63 and thence, through a switch-arm 65 pivotally mounted at 64, to the wire 66.
  • a transverse arm 67 is I switch non-responsive to short overloadings Within certain toleration time limits, but to efiect release of the switch when such overloads last a longer time.
  • the thermostat 63 has been regulated for 2 amp. it will have extended in one minute at 5 amp. to such a length that it lifts the plunger armature 5 and causes the releasing of the switch. W'hen-the overloading is of shorter duration, it is without effect.
  • the two shunts 68 and 69 be also tuned to 2 amp. WVhen then the switch-arm 64 is so adjusted that the bimetal strip 66 and the shunt 68 are parallel-connected, the nominal current-intensity amounts to 4 amp. and
  • Figs. 13 and 14 the lower part of a plugswitch is illustrated, in which the alteration of the nominal current-intensity can be produced by altering the toot-contact-stud.
  • the plug-body l carries the foot-contact-stud 70 which corresponds for example to a nominal current-intensity of 6 amp. It is connected by a metalstrip 71 and a Wire 72 to the thermostat (not shown) which is tuned to 6 amp. WVhen the nominal current-intensity has to be increased to 10 amp., a metal-sleeve 73 is pushed over the foot-contact 7 O. This metalsleeve is connected by contact-finger 74, spring 75 and wire 80 to a shunt resistance (not shown).
  • Another sleeve 76 is pushed over the sleeve 73.
  • the sleeve 76 is then connected by a finger 77, spring 78 and wire 79 to a shunt resistance which, together with the shunt resistance connected to sleeve 73, will be tuned to 15 amp.
  • studs of solid cross-section may be used, the diameter or length of which corresponds to the nominal current-intensity.
  • Figs. 15 and 16 show such an arrangement by way of example.
  • the metal piece-34, mounted in the plugbody 1 is connected to a thermostat (not shown) by a wire 81.
  • a tube 82 made ofelectric nonconducting material is mounted,
  • a contact-screw 83 which carries in its top-end a contact-screw 83. Between this contact-screw 83 and the stud 70 a resistance 84 is arranged.
  • the screw 83 is screwed into a contact-piece 85, which is connected to the switch by a wire 86 so that the resistance 84 acts as shunt to the thermostat.
  • the screw 83 is unscrewed from the contact-piece 85, and the stud can be removed like a cartridge and another of a different value substituted therefor.
  • the length of the stud varies in accordance with the currentintensities.
  • Fig. 16 shows a short stud 87 designed for lighter current-intensities.
  • An automatic circuit breaker of the screw-plug type comprising a casing having a spark space, a magnet coil having one of magnet-coil which faces the spark-space.
  • a c1rcu1t breaker as speclfied ln-claim 1 embodying a push-button, a switch-rod on said push-button, an insulating partition between said magnet-coil and said spark-space having two apertures at opposite points near the edge thereof for passage of said connecting-means and a central opening for said switch-rod, said plunger armature closing said central opening of said partition on a circuit breaking movement of the switch contacts.
  • a circuit breaker as specified in claim 1, in which the connecting-means between said releasing mechanism and said switchcontacts comprises arms carrying members engageable with and disengageable from the plunger armature to respectively close and openthe switch contacts.
  • a circuit breaker as specified in claim 1, comprising in combination with the magnet-coil, switch contacts on one side of said magnet coil, a releasing mechanism on the other side of said magnet coil and a plunger armature in said magnet coil, 'connectlng means between said switch contacts and said releasing mechanism consisting of two contact-arms pivotally mounted at the sides of said magnet-coil, a separating disk on the lower end of said plunger armature, a roller at the lower end of each of the two-armed contact-arms, said rollers pressing against said separating disk to press together the upper ends of said contact-arms forming the switch contacts, and springs acting on. said contact arms to force the switch contacts apart'as soon as said rollers are released by the attracted plunger armature.
  • a circuit breaker as specified in claim 1 comprising in combination with a casing having a spark space, a magnet coil, switch contacts in said spark space and on one side of said magnet coil, a releasing mechanism on the other side of said magnet coil, means connecting said switch contacts with said releasing mechanisms, and a partition of insulating material between the coil and spark space and forming passages for said connecting means one at each side of said magnet coil.
  • VVILHELM LEYHAUSEN VVILHELM LEYHAUSEN.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Push-Button Switches (AREA)
US266089A 1926-08-14 1928-03-30 Automatic circuit breaker Expired - Lifetime US1750895A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1750895X 1926-08-14

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US1750895A true US1750895A (en) 1930-03-18

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US266089A Expired - Lifetime US1750895A (en) 1926-08-14 1928-03-30 Automatic circuit breaker

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US (1) US1750895A (enrdf_load_html_response)
BE (1) BE349611A (enrdf_load_html_response)
FR (1) FR651363A (enrdf_load_html_response)
GB (1) GB309704A (enrdf_load_html_response)
NL (1) NL23514C (enrdf_load_html_response)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2612575A (en) * 1947-06-13 1952-09-30 Francis Ondrejca Resetting fuse plug
US2926288A (en) * 1954-06-01 1960-02-23 George J Kupchik Electrical protective apparatus
US5034714A (en) * 1989-11-03 1991-07-23 Westinghouse Electric Corp. Universal relay
US20160217953A1 (en) * 2013-09-10 2016-07-28 Apple Inc. Generator Button for Electronic Devices
US10056213B1 (en) * 2017-04-16 2018-08-21 Kuo-Lung Kuan Electromagnetic switch protection structure
US11545311B2 (en) * 2019-09-11 2023-01-03 Kedu Electric Co., Ltd. Electromagnetic switch

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2612575A (en) * 1947-06-13 1952-09-30 Francis Ondrejca Resetting fuse plug
US2926288A (en) * 1954-06-01 1960-02-23 George J Kupchik Electrical protective apparatus
US5034714A (en) * 1989-11-03 1991-07-23 Westinghouse Electric Corp. Universal relay
US20160217953A1 (en) * 2013-09-10 2016-07-28 Apple Inc. Generator Button for Electronic Devices
US10312039B2 (en) * 2013-09-10 2019-06-04 Apple Inc. Generator button for electronic devices
US10056213B1 (en) * 2017-04-16 2018-08-21 Kuo-Lung Kuan Electromagnetic switch protection structure
US11545311B2 (en) * 2019-09-11 2023-01-03 Kedu Electric Co., Ltd. Electromagnetic switch

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Publication number Publication date
BE349611A (enrdf_load_html_response)
NL23514C (enrdf_load_html_response)
FR651363A (fr) 1929-02-21
GB309704A (en) 1929-04-18

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