US2260901A - Electric switch - Google Patents

Electric switch Download PDF

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Publication number
US2260901A
US2260901A US309284A US30928439A US2260901A US 2260901 A US2260901 A US 2260901A US 309284 A US309284 A US 309284A US 30928439 A US30928439 A US 30928439A US 2260901 A US2260901 A US 2260901A
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United States
Prior art keywords
switch
contacts
movable
fixed
electro
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Expired - Lifetime
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US309284A
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English (en)
Inventor
Hinks Bernard
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Individual
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Individual
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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
    • 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
    • H01H50/644—Driving arrangements between movable part of magnetic circuit and contact intermediate part performing a rotating or pivoting movement having more than one rotating or pivoting part
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/005—Inversing contactors

Definitions

  • This invention relates to electro-magnetically operated switches of the type in which the movable contact carrying member is carried by the movable member of an electromagnet which may be the plunger of a solenoid or an armature, and which closes the movable contact member on the fixed contact carrying member when the magnet is energised.
  • An object of the present invention is to construct a switch in which the movable contact carrying member when moving from one set of contacts will automatically engage in an eflicient manner. another set of contacts.
  • a further object of the present invention isto eflect an automatic change over from one set of contacts closing one circuit to another set of contacts closing another circuit after an interval of time.
  • Figure 2 is an underside plan view of Figure 1 but showing the switch closed in the star position.
  • FIG 3 is a diagrammatic arrangement of the switch as shown in Figures 1 and 2, the switch being in the off position.
  • Figure 4 is a similar view of Figure 3, showing the switch closed in the star position.
  • Figure 5 is a view of a switch, as shown by Figure 3, in the "delta position.
  • Figure 6 is a diagrammatic arrangement of a modified form of switch and circuit with the switch in the off position.
  • Figure 7 is the arrangement shown by Figure 6 with the switch in position with an auto-transformer in circuit and supplying a current at reduced voltage to the motor.
  • Figure 8 is the arrangement shown by Figure 6 showing the switch in position with the autotransformer disconnected.
  • Figure 9 is a side elevation of a modified form of switch.
  • Figure 10 is a plan of the switch shown by Figure 9.
  • Figure 11 is a sectional elevation, the section being taken on line XIV-XIV of Figure 10.
  • Fig. 12 is a circuit diagram for the switch shown in Figs. 9, 10 and 11, the switch being shown in the off position.
  • Fig. 13 is a circuit diagram for the switch shown in Figs. 9, 10 and 11, the primary resistance being in circuit.
  • Fig. 14 is a. circuit diagram for the switch shown in Figs. 9, 10 and 11, the resistance being cut out.
  • the switch is adapted to automatically change over from the star to the delta" circuit of an electric motor.
  • the magnet comprises three limbs I I having the windings 'III on the centre limb.
  • the fixed contact carrying member I'Ia is supported by the electro-magnet and the armature 2 of the electro-magnet is supported by the links 5 which pivot on fixed spindles la, the spindles 4b fixed to the armature 2 being mounted in slots in the links 5.
  • the armature 2 is thus supported by the links 5 when the switch is in the oil position, but the armature is free to rise when in any laterally adjusted position.
  • the fixed contact carrying member Ila carries three sets of star contacts 28 and delta contacts 3
  • the moving contact carrying member I carrying three sets of blades 29, is fixed to the armature by the connecting pieces 3.
  • the frame Ila fixed to the electro-magnet carries the thermostatic switch I4 and the automatic change over switch I1 is also mounted on the fixed frame IIa.
  • each spindle 4b lies to one side of the pointed portion of a guide member I, so that when the armature rises the spindle will be guided by the side Ia of the members I (see Figure 4).
  • the spring 8 normally retains the movable contact carrying member in this position. When the armature is moved laterally to the right and is then lifted it will pass up between the side lb of the guide, and the fixed frame member He on the left hand side of the switch (see Figure 5).
  • the operation of the switch is as follows: The moving switch member I on the armature 2, is held a distance over with the spindle 4b to one side of the guides I, towards the star contacts 28, by means of the spring 8.
  • the start button 9 is pressed ( Figure 4) the coil III circuit is now completed by the current passing through the leads A, B, C, D, and E to L3 to contacts 3IA and this magnetises the three limbed member I I, and attracts the armature which tends to rise vertically and when the armature has moved a small.
  • a secondary voltage is now induced into the secondary coil l which will cause a large current to pass through the lead H, l4, G, D, E, to L3, through the switch blade and the retaining blade 40, Figures 2 and 4, and the lead K.
  • the blade 40 lies under a blade 29 and presses on the respective contact L3, when the blade 29 presses on its respective contact.
  • 4 should have become heated by the secondary current passing through this which causes this to distort and so break the circuit of the coil l0 and when the armature tends to fall the thermal switch contacts M will be opened further by means of the member 6 relieving the pressure from the thermal switch and so giving a quick break of the thermal switch.
  • the thermal switch I4 is only in series with one of the retaining contacts l3 and the said secondary thermal switch circuit is completed when the contactor is in the star position.
  • 4 acts as the retaining switch when the switch is in the star position, current passing from L2, A, l0, B, contacts 9a, C, F, H, 8, D, E to L3.
  • the autochangeover switch acts as the retaining switch when the switch is in the delta position, current passing from L2, A, III, B, contacts 9a, C, F, M, H, E to L3.
  • the secondary coil I5 is switched ofi when the contactor is in the delta position.
  • each pair of switch blades comprises a long blade 29a and a short blade 29b.
  • the long blade 25a bridges the contacts 35 and cuts out the autotransformer and allows the current at full voltage to pass to the motor.
  • the circuits except for the cutting out or putting in the auto-transformer insteadof having the star" and delta circuits, are as described with reference to Figures 3 to 5.
  • the main leads are indicated by Ll, L2 and L3 and the motor leads by Ml, M2 and M3.
  • the auto-transformer is of the known type.
  • the switch member 46 is normally held in one position by the weight bar 49 which rests on the bar 42 and in this position the switch member 46 is in position, when the solenoid is energised for the bridge contacts to engage the fixed contacts 50 of the fixed contact member on the frame 45 to include the primary resistances 5
  • the automatic action of the switch is similar to that described with reference to Figures 6, '7 and 8.
  • a is closed on the contact 52 by the projection 53 and after an interval of time, the thermostatic switch breaks and deenergises the solenoid.
  • the plunger with the switch member 46 is opened by the springs 54 and when the switch member 46 reaches the limit of its outward movement the momentum of the weight bar 49 causes the switch member to swing over and close the spring blade switch contact 55 against the contact 56 and energise the solenoid. This causes the plunger to be attracted to move the switch member into the on" position with the bridge contacts 41 engaging the fixed contacts 56.
  • the fixed contacts 56 are separated by the insulating walls 58. 59 are the retaining switch contacts which coact with the spring arm contact 66 on the switch member 46.
  • the switch arm 55 is located in a slot in the member 6
  • the spring blade contact 55 is fixed at one end to the fixed contact carrying member and near its other end it passes through the slot in the member 6
  • the spring blade contact therefore moves laterally with the movable contact carrying member 46 and the said slot permits the member 6
  • the contact 56 is at its inner end connected to the fixed contact carrying member.
  • the switch is guided into the correct position by the guide members 62 and 63 which coact respectively with the projection 64 and a bridge contact blade 41.
  • the blade 41 will co-act with the inclined upper edges of the. guide members position the movable contact member, if necessary, when attracted to the fixed contact carry- 62, 66 to correctly ing member.
  • the projection 64 will then be in a similar position to co-act with the said inclined upper edges of the guide members 62, 63 if necessary.
  • An electro-magnetically operated switch comprising an electro-magnetic device, a movable contact carrying switch member attached to'the movable member of the electro-magnetic device and supported on pivoted links so that when in the oil position it is capable of swinging laterally, a row of bridge contacts carried by said movable switch members a fixed contact carrying member having contacts which can be selectively bridged to complete either of two electric circuits the movable switch being normally positioned so that when attracted by the electromagnetic device it will bridge the contacts of one circuit, a thermostatic switch for breaking the circuit of the electro-magnet to cause the movable contact member to move into the off position, means for causing the movable contact member to swing over when in the ofi position into position for completing a second circuit, and a switch operated by the said swinging over of the movable contact member for energising the electro-magnet and moving the switch member into position for closing the said second circuit.
  • An electromagnetically operated selecting switch comprising an electro-magnetic device, a movable contact carrying switch member attached to the movable member of the electromagnetic device, a plurality of parallel bridge contacts carried by the said movable switch member, a fixed contact carrying member, and means for mounting the said movable switch member so that it automatically moves in a lateral direction when moving from one contacting position to place such member into position for being attracted to contact a second set 01 contacts and a switch which is operated by the lateral movement of the movable contact carrying; member for energising the electro-magnet to cause the movable contact carrying member to move to contact such second set of contacts.
  • An electro-magnetically operated selecting switch comprising an electro-magnetic device, a movable contact carrying switch member attached to the movable member of the electromagnetic device and supported on pivoted links so that when in the off position it is capable of swinging laterally, a row of bridge contacts carried by said movable switch member, a fixed contact carrying member having contacts which can be selectively bridged to complete either of two electric circuits, means for automatically swinging the movable contact carrying member laterally into position, for being raised into engagement with the second set of fixed contacts, when moving from one contacting position and a switch, which is operated by contact with the movable contact carrying member when such member swings laterally, for energising the electro-magnet to cause the movable contact carrying member to engage the said second set of contacts.
  • An electro-magnetically operated selecting v switch comprising an electro-magnetic device, a movable contact carrying switch member attached to the movable member of the electroc-' magnetic device, a plurality of parallel bridge contacts carried by the said movable switch member, a fixed contact carrying member, and means for mounting the said movable switch member so that it automatically moves in a lateral direction when moving from one contacting position to place such member into position for being attracted to contact a second set of contacts, a switch which is operated by the lateral movement of the movable contact carrying member for energizing the electro-magnet to cause the movable contact carrying member to move to contact such second set of contacts and means for de-energizing the said electro-magnet after an interval of time so that the movable switch member will be free to move from one contacting position to the other.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Motor And Converter Starters (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Branching, Merging, And Special Transfer Between Conveyors (AREA)
US309284A 1938-12-22 1939-12-14 Electric switch Expired - Lifetime US2260901A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB37287/38A GB524015A (en) 1938-12-22 1938-12-22 Improvements in electromagnetically-operated selecting switches
GB32411/39A GB534103A (en) 1938-12-22 1939-12-18 Improvements in electro-magnetically operated selecting switches

Publications (1)

Publication Number Publication Date
US2260901A true US2260901A (en) 1941-10-28

Family

ID=32095232

Family Applications (1)

Application Number Title Priority Date Filing Date
US309284A Expired - Lifetime US2260901A (en) 1938-12-22 1939-12-14 Electric switch

Country Status (4)

Country Link
US (1) US2260901A (enrdf_load_stackoverflow)
BE (1) BE468341A (enrdf_load_stackoverflow)
FR (1) FR865346A (enrdf_load_stackoverflow)
GB (2) GB524015A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
GB524015A (en) 1940-07-29
BE468341A (enrdf_load_stackoverflow) 1946-11-30
GB534103A (en) 1941-02-27
FR865346A (fr) 1941-05-23

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