US2733313A - Automatic switches - Google Patents

Automatic switches Download PDF

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Publication number
US2733313A
US2733313A US2733313DA US2733313A US 2733313 A US2733313 A US 2733313A US 2733313D A US2733313D A US 2733313DA US 2733313 A US2733313 A US 2733313A
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US
United States
Prior art keywords
lever
switch
solenoid
contact
bar
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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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English (en)
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.)
Publication date
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Publication of US2733313A publication Critical patent/US2733313A/en
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    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures
    • 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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/504—Manual reset mechanisms which may be also used for manual release provided with anti-rebound means

Definitions

  • a lever carrying the movable contact is controlled for the automatic opening operation by the movable core of a solenoid traversed by the current to be interrupted, the core acting on a bar slidably mounted along the vertically disposed axis of the solenoid.
  • this lever is easily susceptible to vibration at the instant of the opening, which action may easily cause the reestablishment of the are after it has been cut out.
  • the switch of the present invention which while substantially based on the same general principles as the known switches, is still differentiated therefrom by the fact that the active part of the control bar of the contact carrying lever has a wedge-like profile having a constant inclination, so as to obtain at the moment of opening an explosive distance of the contacts increasing according to a linear function of the excess current to be interrupted.
  • the switch of the present invention also provides means for dampening the oscillations tending to occur in the contact-carrying lever during the opening, which means co-operate to ensure the quickness of the closing.
  • the ordinary spring means for the quick closure of the switch are furthermore caused to act upon the contact-carrying lever at a point located between the contact and the fulcrum point of the lever, in the immediate neighbourhood of the fulcrum point.
  • Fig. l is a longitudinal section of one embodiment of the invention with contacts closed;
  • Fig. 2 is a similar section with the switch in the open position caused by actuation of the hand control, and
  • Fig. 3 is also a similar section, but in the open position caused by operation of the automatic control.
  • the switch is composed in a known way of a base 1 having a cross cavity 1' housing an oscillating pivoted lever 2 by means of which is effected the manual control of the switch, this lever contacting a wing 3' obtained by partially shearing a piece from a lever 3 carrying movable contact 4.
  • Fixed contact 5 carried by base 1 as shown.
  • Spring 6 which determines the quick closure when lever 2 is carried from the position shown in Fig. 2 to that shown in Fig. 1, acts at one end upon lever 3 at a point situated between its fulcrum 7 and movable contact 4 and at its other end is caused to react on a projection 8' of a frame 8 which supports the solenoid 9.
  • Frame 8 is carried by the base 1.
  • leaf spring 12 fastened as by rivet 12' to lever 3 and reacting with its opposite end upon cylinder 11' (see Fig. 3) depending from solenoid 9.
  • This leaf spring has shown itself to be very useful in practice either as a vibration dampener or as an auxiliary means co-operating with spring 6 for increasing the rapidity of closing.
  • Incline 10' of bar 10 co-operates with tail 3" of lever 3 for operating the automatic opening of the contacts and has uniform taper, so that the action exerted upon bar 10 by core 11 of solenoid 9, variable in relation to the intensity of the current passing through the solenoid, always causes the contacts to open with an explosive distance variable in relation to the intensity of the excess current. Therefore, since the required work for opening varies proportionately, it follows that it will suffice if the number of turns of solenoid 9 is proportioned to the required explosive distance for the smallest excess current that is to be interrupted. The overall dimensions of the solenoid and the required quantity of copper are thus reduced to a minimum.
  • solenoid 9 that is traverse by said current attracts core 11 which, developing a strength greater than the action of its own weight, of the weight of bar 10 and of the component of the action of springs 6 and 12 in the direction of the bar, lifts bar 10 causing its incline 10' to slide in contact with the end of tail 3" of lever 3, which is thus caused to rotate clockwise.
  • This opens contacts 4 and 5 by a quantity proportional to the thrust of core 11 against bar 10; the reaction of spring 6 and 12 against incline 10' blocks bar 10 at the point reached and prevents bar 10 from falling back, while core 11 falls due to the interruption of the current, thus ensuring the maintenance of the switch in the open position (Fig. 3).
  • manual control lever 2 In this position manual control lever 2 is still in the position of closure of the switch; by carrying said lever 2 to the open position as represented in Fig. 2, a further clockwise rotation of lever 3 is caused, thus disengaging its tail 3" from bar 10 which can thus fall back under the action of its own weight to predispose itself for a new automatic operation. Said manual control lever 2 may then be carried again to the position of closure represented in Fig. l with the certainty that when the excess current re-occurs, the automatic opening of the switch will again be effected.
  • a slow manual opening and quick closing switch with automatic opening for excess current comprising a fixed contact, an oscillating pivoted lever, a movable contact carried by said oscillating lever, spring means acting on said lever for urging the movable contact into closing position, a solenoid traversed by the current to be interrupted upon separation of the contacts and having a vertical axis, an axial cylindrical guide in said solenoid, a core movable axially of said solenoid in said cylindrical guide, a rod slidably mounted in the same guide in alignment with said core and having a wedge'like head, said lever having a portion lying in the path of travel of said wedgelike head, said head being actuated by said core for engaging and controlling said oscillating lever for the automatic opening of the contacts against the action of said spring means and for yieldingly keeping said contacts open, and manually operated means for positively bringing said contacts in position of complete opening permitting the resetting of the rod with wedge-like shaped head for the automatic opening and for leaving them free to the action of said spring means for the
  • a switch as in claim 1 wherein said spring means consist in a spiral spring acting on a point located between the contact and the fulcrum of the oscillating lever in the immediate proximity of the fulcrum.
  • a switch as in claim 2 wherein means are provided for dampening the oscillations of the oscillating lever during the opening and for aiding closing, said means consisting in a leaf spring fixed at one end to a point of the oscillating lever located between the fulcrum of said lever and the movable contact thereby carried and reacting at its other end on a fixed point of the frame.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Breakers (AREA)
US2733313D 1951-09-29 Automatic switches Expired - Lifetime US2733313A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT306171X 1951-09-29

Publications (1)

Publication Number Publication Date
US2733313A true US2733313A (en) 1956-01-31

Family

ID=11230200

Family Applications (1)

Application Number Title Priority Date Filing Date
US2733313D Expired - Lifetime US2733313A (en) 1951-09-29 Automatic switches

Country Status (6)

Country Link
US (1) US2733313A (cs)
BE (1) BE513905A (cs)
CH (1) CH306171A (cs)
DE (1) DE927938C (cs)
FR (1) FR1062658A (cs)
GB (1) GB709173A (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211955A (en) * 1960-03-29 1965-10-12 Westinghouse Electric Corp Circuit interrupting device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1700240A (en) * 1920-06-21 1929-01-29 Betts & Betts Corp Current limiter
US1749602A (en) * 1924-02-18 1930-03-04 Westinghouse Electric & Mfg Co Electrical protective device
US1842128A (en) * 1929-10-17 1932-01-19 John F Maertz Railroad crossing gate
US2503632A (en) * 1949-04-20 1950-04-11 Prather Porter Automatic electric switch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1700240A (en) * 1920-06-21 1929-01-29 Betts & Betts Corp Current limiter
US1749602A (en) * 1924-02-18 1930-03-04 Westinghouse Electric & Mfg Co Electrical protective device
US1842128A (en) * 1929-10-17 1932-01-19 John F Maertz Railroad crossing gate
US2503632A (en) * 1949-04-20 1950-04-11 Prather Porter Automatic electric switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211955A (en) * 1960-03-29 1965-10-12 Westinghouse Electric Corp Circuit interrupting device

Also Published As

Publication number Publication date
DE927938C (de) 1955-05-20
CH306171A (fr) 1955-03-31
GB709173A (en) 1954-05-19
BE513905A (cs)
FR1062658A (fr) 1954-04-26

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