US2761040A - Lever-actuated switch - Google Patents

Lever-actuated switch Download PDF

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Publication number
US2761040A
US2761040A US507945A US50794555A US2761040A US 2761040 A US2761040 A US 2761040A US 507945 A US507945 A US 507945A US 50794555 A US50794555 A US 50794555A US 2761040 A US2761040 A US 2761040A
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US
United States
Prior art keywords
lever
arm
switch
switching point
contact
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
US507945A
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English (en)
Inventor
Ulrich Alfred
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.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
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.)
Filing date
Publication date
Application filed by Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US2761040A publication Critical patent/US2761040A/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
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/38—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H9/383—Arcing contact pivots relative to the movable contact assembly

Definitions

  • Lever switches for heavy currents are known, which are provided with two current carrying switching points, said switching points being guided in such manner that they will open and close one after the other with the operating mechanism reversing its direction for each make and break.
  • lever switches with one main and one auxiliary switching point where the auxiliary contact takes over the duty of making and breaking the circuit; it is always the first to close and the last to open the circuit.
  • An object of the invention is to provide a lever switch with two parallel and current carrying switching points, one of which will always be the last to be opened as well as the last to be closed. It is the basic characteristic of the invention that the moveable contact of that switching point, which will always be the last to be active, is located on a bellcrank lever, said lever being subjected to a compressive force and mounted to pivot at the end of a singlenrmed lever, said single-armed lever carrying the moveable contact of the second switching point, and that the free arm of said bellcrank lever is connected by means of a steering arm to another single-armed lever which in turn is linked to the first single-armed lever carrying the moveable contact of the second switching point and forming a knee joint with a driving crank, which turns always in the same direction, said knee joint being in its stretched position when the switch is closed.
  • FIG. 1 shows the switch in the on position, i. e. with the switch contacts closed
  • Fig. 3 shows the switch in the off position, i. c. with the switch contacts open
  • Figs. 2 and 4 show, respec tively, the positions of the switch actuating mechanism immediately before breaking, and immediately before making of the circuit controlled by the switch contacts.
  • numeral 1 indicates the base plate of the switch and upon which the contact actuating mechanism is mounted.
  • the base plate carries stationary contact elements 2, 3 which with their moveable counter contact elements 2a, 3a mounted on the moveable switch mechanism form the current carrying switching points which are, electrically speaking, in parallel.
  • the switching point 2, 2a has the duty to make the circuit and the stationary contact 2 is provided with laminated, or finger, contacts which engage practically simultaneously the moveable counter part 2a thereby di- 2,761,040 Patented Aug. 28, 1958 ice viding the load and keeping the mechanical and thermal stresses to a minimum.
  • the switching point 3, 3a serves as the circuit breaker; its contacts are massive block contacts which can endure a certain amount of wear caused by the cut-off arc.
  • the moveable contact 2a of the switching point 2, 2a is located at the outer end of a single-arm lever 4 mounted pivotally at 12 at its opposite end on a bracket 5 extending laterally outward from the base plate 1.
  • the moveable contact 30: of the switching point 3, 3a is located on and at the outer end of one arm 6a of a bellcrank lever 6 mounted pivotally at 13 intermediate its arms to the outer end of lever 4. Force is applied to lever 6 by a helical compression spring 7 which is connected at 14 to, and acts on, the other arm 6b of lever 6, the opposite end of the spring 7 being secured at 15 to bracket 5.
  • Arm 6b of bellcrank lever 6 is also connected at its outer end by a sliding pivot connection 16 to one end of a steering arm 8, the opposite end of arm 3 being pivotally conected at 17 to an intermediate portion of a single-arm dog-leg-shaped lever 9.
  • One end of lever 9 is connected pivotally at 10 to lever 4 intermediate the ends of the latter, and the opposite end of lever 9 is pivotally connected at 18 to the outer end of a crank 11, the inner end of this crank being fixed to a shaft rotatable about its axis 19.
  • the dog-lever 9 forms a knee joint with the driving crank 11 which is arranged to always rotate in the direction indicated by the arrow and will assume a dead-center position when the switch contacts are closed, the position indicated in Fig. 1, wherein it will be seen that the crank axis 19, crank pivot 18 and pivot 16 all lie in a straight line.
  • the driving crank 11 can be operated either manually, or by a motor or a spring driven device. It performs one complete revolution during one circuit breaking and making operation.
  • crank 11 When, for the purpose of breaking the circuit, crank 11 is set in motion in the direction indicated by the arrow, lever 9 will deflect the knee joint, and lever will then begin to turn about its pivotal mounting point 12 at the bracket 5.
  • the switching point 2, 2a then opens. Due to the pivotal mount of the lever 4 the position of bellcrank lever 6, which is then using the switching point 3, 3a as it fulcrum, will also change.
  • the spring '7 will now expand longitudinally and its pressure will lessen. However, the contacts of the switching point 3, 3a will still be subject to, at least, the same pressure because, due to the displacement of the bellcrank lever 6, the eifective leverage of the spring 7 has increased (see Figure 2).
  • a lever actuated switching mechanism comprising two current carrying and parallel arranged sets of switching points, one of said sets of switching points being the last to be opened as well as the last to be closed, the movable contact element of said set of switching points that is last to be opened and closed being located on one arm of a bellcrank lever, said bellcrank lever being subjectable to a force tending to rotate the same about its pivot and said bellcrank lever being pivotally mounted at the end of a first single-arm lever, and said first single arm-lever carrying the movable contact element of said other set of switching points, the other arm of said bellcrank lever having pivotally connected thereto one end of a steering arm, the other end of said steering arm being pivotally connected to an intermediate portion of a second singlearm lever, one end of said second single-arm lever being pivotally connected at an intermediate point on said first single-arm lever and the other end of said second single arm lever being pivotally connected to the outer end of a crank arm rotatable always in the same direction, said second single-arm lever forming

Landscapes

  • Switches With Compound Operations (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
US507945A 1954-05-17 1955-05-12 Lever-actuated switch Expired - Lifetime US2761040A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2761040X 1954-05-17

Publications (1)

Publication Number Publication Date
US2761040A true US2761040A (en) 1956-08-28

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ID=4571567

Family Applications (1)

Application Number Title Priority Date Filing Date
US507945A Expired - Lifetime US2761040A (en) 1954-05-17 1955-05-12 Lever-actuated switch

Country Status (3)

Country Link
US (1) US2761040A (enrdf_load_stackoverflow)
BE (1) BE538234A (enrdf_load_stackoverflow)
DE (1) DE1009697B (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959654A (en) * 1958-12-19 1960-11-08 Ite Circuit Breaker Ltd Latched type shunted contact for three stage contact construction
US2993105A (en) * 1957-12-13 1961-07-18 Westinghouse Electric Corp Circuit breaker
US3017480A (en) * 1958-08-27 1962-01-16 Hazemeijer Co High-voltage circuit-breaker
US3020374A (en) * 1959-07-02 1962-02-06 Ite Circuit Breaker Ltd Circuit breaker arcing contact construction
US3042766A (en) * 1958-10-28 1962-07-03 Jennings Radio Mfg Corp Vacuum load-break switch
US3076882A (en) * 1957-08-22 1963-02-05 Gen Electric Electric circuit breaker
US3210506A (en) * 1957-12-13 1965-10-05 Westinghouse Electric Corp Circuit breaker with improved contact structure
US3249729A (en) * 1963-10-18 1966-05-03 Gen Electric Electric circuit breaker wherein the operation of separable arcing contacts is dependent on the magnitude of current in the main contacts
US3496319A (en) * 1966-12-07 1970-02-17 Empire Switchboard Co Inc High current electric switch with arc chute interlocked with movable contact,and spring driving means
US4544811A (en) * 1984-06-08 1985-10-01 Methode Electronics, Inc. Electric switch
EP4075464A1 (fr) * 2021-04-16 2022-10-19 Schneider Electric Industries SAS Interrupteur de courant sur un circuit électrique de moyenne ou haute tension

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4369371A1 (en) * 2022-11-09 2024-05-15 ABB Schweiz AG Electrical contact and method of designing an electrical contact

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581181A (en) * 1950-01-07 1952-01-01 Gen Electric Heavy-duty air circuit breaker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE540926C (de) * 1932-01-05 Siemens Schuckertwerke Akt Ges Schalter mit Vorstufe
US2174236A (en) * 1937-02-27 1939-09-26 Westinghouse Electric & Mfg Co Multiple-blade disconnecting switch

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581181A (en) * 1950-01-07 1952-01-01 Gen Electric Heavy-duty air circuit breaker

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076882A (en) * 1957-08-22 1963-02-05 Gen Electric Electric circuit breaker
US2993105A (en) * 1957-12-13 1961-07-18 Westinghouse Electric Corp Circuit breaker
US3210506A (en) * 1957-12-13 1965-10-05 Westinghouse Electric Corp Circuit breaker with improved contact structure
US3017480A (en) * 1958-08-27 1962-01-16 Hazemeijer Co High-voltage circuit-breaker
US3042766A (en) * 1958-10-28 1962-07-03 Jennings Radio Mfg Corp Vacuum load-break switch
US2959654A (en) * 1958-12-19 1960-11-08 Ite Circuit Breaker Ltd Latched type shunted contact for three stage contact construction
US3020374A (en) * 1959-07-02 1962-02-06 Ite Circuit Breaker Ltd Circuit breaker arcing contact construction
US3249729A (en) * 1963-10-18 1966-05-03 Gen Electric Electric circuit breaker wherein the operation of separable arcing contacts is dependent on the magnitude of current in the main contacts
US3496319A (en) * 1966-12-07 1970-02-17 Empire Switchboard Co Inc High current electric switch with arc chute interlocked with movable contact,and spring driving means
US4544811A (en) * 1984-06-08 1985-10-01 Methode Electronics, Inc. Electric switch
EP4075464A1 (fr) * 2021-04-16 2022-10-19 Schneider Electric Industries SAS Interrupteur de courant sur un circuit électrique de moyenne ou haute tension
FR3122032A1 (fr) * 2021-04-16 2022-10-21 Schneider Electric Industries Sas Interrupteur de courant sur un circuit électrique de moyenne ou haute tension

Also Published As

Publication number Publication date
DE1009697B (de) 1957-06-06
BE538234A (enrdf_load_stackoverflow)

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