US2794080A - Rotary multi-contact switch - Google Patents

Rotary multi-contact switch Download PDF

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Publication number
US2794080A
US2794080A US509900A US50990055A US2794080A US 2794080 A US2794080 A US 2794080A US 509900 A US509900 A US 509900A US 50990055 A US50990055 A US 50990055A US 2794080 A US2794080 A US 2794080A
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US
United States
Prior art keywords
contact
rotary
adjacent
stationary
bars
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
US509900A
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English (en)
Inventor
Stoecklin Josef
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 US2794080A publication Critical patent/US2794080A/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
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/56—Angularly-movable actuating part carrying contacts, e.g. drum switch
    • H01H19/566—Angularly-movable actuating part carrying contacts, e.g. drum switch in which the contact making surfaces are inclined, i.e. not perpendicular, to the axial or radial direction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/10—Movable parts; Contacts mounted thereon
    • H01H19/12—Contact arrangements for providing make-before-break operation, e.g. for on-load tap-changing

Definitions

  • the principal object of the present invention is to provide an improved device for switching from one contact to another in changing taps on the secondary of a current transformer without interrupting the secondary circuit.
  • This objective is attained by means of an improved rotary switch comprising one rotary arm and contact thereon adapted to make successive engagement with each of a plurality of stationary contacts arranged in a generally circular array, the stationary contacts being so constructed that the rotary contact engages the next contact in the series before disengaging the one with which it has been in contact or engaged. Consequently a circuit is always established between the rotary contact and one of the stationary contacts notwithstanding the fact that the rotary contact shifts from one to another of the stationary contacts. Actually when passing from one to another of the stationary contacts the rotary contact simultaneously engages the adjacent end portions of adjacent stationary contacts thus assuring continuity of the secondary circuit of the current transformer.
  • a more particular object of the invention is to provide a rotary multi-contact point switch comprising a rotary contact adapted to make successive engagement with each of a plurality of stationary contact bars arranged generally in a circular array about the center of rotation of the rotary contact, the adjacent ends of adjacent bars being overlapped as related to the path travelled by the rotary contact so that the latter will, for a brief period, in passing between adjacent contacts be engaged simultaneously with those adjacent overlapping bar ends.
  • the stationary contact bars are straight and each bar is provided with a centrally located notch with sloping sides to receive the rotary contact. Also, adjacent contact bars are located at an angle to each other and with the adjacent ends of adjacent bars laterally overlapped with respect to the path of travel of the rotary contact.
  • Fig. 1 is a front elevation of the rotary 2,794,080 Patented May 28, 1957 2 switch
  • Fig. 2 is a vertical section taken on line 2-2 of Fig. 1.
  • the body of the switch is seen to be comprised of a support 10 which is of insulating material and preferably made from pressed laminations of sheets of insulating material.
  • the stationary contacts are indicated at 11 and these are seen to be constituted at their contact faces by bars 12 each having a centrally located recess 13 with sloping sides so as to permit the rotary contact member 14 to more easily move into and out of the recess.
  • Each of the stationary contacts includes a stem portion 15 extending through the support 10 and which terminates in a lug 16 by which to make a soldered connection with the conductor end. It is also possible to press the bars 12 into the face of the laminated insulating support plate 10 at the time the plate is manufactured.
  • the stationary contact bars 12 are arranged in a generally circular array about the center of rotation of the rotary contact member 14.
  • the adjacent end portions 12:: of the contact bars are laterally overlapped as regards the path of rotation of contact member 14 to the end that contact member 14 simultaneously engages such end portions for a brief period when switching from one to an adjacent stationary contact. In this manner, circuit continuity is always maintained between the rotary contact member 14 and at least one of the stationary contact members or bars 12.
  • each of the stationary contact bars 12 makes, or is set at, an oblique angle to its adjacent bar and that the bars form an angle a with the tangent to the circle.
  • the rotary contact member 14 constitutes the outer end of an arm 17 which is secured at its inner end to a spindle 18 having a knob 19 for ease in turning by hand.
  • Spindle 18 is journalled in a bushing sleeve 20 secured within an opening extending through plate 10.
  • a spring 21 is located on spindle 18 at the side of plate 10 opposite that on which the rotary contact member 14 is located and the spring is retained in position on the spindle and under compression by means of a washer 22 and pin 23 which passes transversely through the outer end of the spindle.
  • One end of the spring 21 bears against the washer 22 and the other end bears against the back face of plate 10. The result of such arrangement is to bias spindle 18 and hence arm 17 and contact member 14 into engagement with the stationary contacts 12.
  • a screw 24 at the end of spindle 18 provides a means for connecting a conductor end to the spindle and hence to the rotary contact member 14, it being assumed of course that all parts of the switch excepting the mounting plate 10 are made of electrically conductive material.
  • a rotary switch comprising a sup- 3 port plate of insulating material, a rotary contact mem ber mounted on said support, a plurality of flat elongated stationary contact members mounted on said support in a substantially arcuate array about the center of rotation of said rotary contact member, the contact ends of said stationary contact members engaged by said rotary contact member being recessed between their narrow sides for engagement in succession by said rotary contact member, adjacent recessed ends of adjacent ones of saidstationary contact members being laterally and obliquely overlapped so that said rotary contact member in moving from one to another of said stationary contact members simultaneously and temporarily engages said overlapped end portions thereby maintaining temporary circuit continuity between said rotary contact member and adjacent 15 2664473 ,4 ones of said stationary contact members, said stationary contact members extending through said support plate and including connection means such as lugs at the opposite ends thereof.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
US509900A 1955-02-16 1955-05-20 Rotary multi-contact switch Expired - Lifetime US2794080A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2794080X 1955-02-16

Publications (1)

Publication Number Publication Date
US2794080A true US2794080A (en) 1957-05-28

Family

ID=4571840

Family Applications (1)

Application Number Title Priority Date Filing Date
US509900A Expired - Lifetime US2794080A (en) 1955-02-16 1955-05-20 Rotary multi-contact switch

Country Status (3)

Country Link
US (1) US2794080A (en, 2012)
CH (1) CH329534A (en, 2012)
DE (1) DE1049471B (en, 2012)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3098130A (en) * 1958-06-19 1963-07-16 Electro Commutation L Electric switches
US3183464A (en) * 1959-12-21 1965-05-11 Sony Corp Tuner device for a radio or television receiving apparatus
US3221111A (en) * 1961-12-16 1965-11-30 Philips Corp Hearing aid construction

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US734438A (en) * 1902-11-13 1903-07-21 Westinghouse Electric & Mfg Co Voltage-regulator.
US825838A (en) * 1905-02-04 1906-07-10 Pittsfield Spark Coil Company Electric switch.
US1395886A (en) * 1920-03-03 1921-11-01 Amberton Richard Electric-circuit controller
US1493817A (en) * 1922-10-24 1924-05-13 Clayton Mcrae R Automatic pressure-regulating valve
US1624391A (en) * 1923-11-09 1927-04-12 Western Electric Co Electric switch
US2454295A (en) * 1946-06-05 1948-11-23 Edwards & Company Inc Push-button switch construction
US2664473A (en) * 1952-01-21 1953-12-29 Brown Brockmeyer Company Selector switch

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US734438A (en) * 1902-11-13 1903-07-21 Westinghouse Electric & Mfg Co Voltage-regulator.
US825838A (en) * 1905-02-04 1906-07-10 Pittsfield Spark Coil Company Electric switch.
US1395886A (en) * 1920-03-03 1921-11-01 Amberton Richard Electric-circuit controller
US1493817A (en) * 1922-10-24 1924-05-13 Clayton Mcrae R Automatic pressure-regulating valve
US1624391A (en) * 1923-11-09 1927-04-12 Western Electric Co Electric switch
US2454295A (en) * 1946-06-05 1948-11-23 Edwards & Company Inc Push-button switch construction
US2664473A (en) * 1952-01-21 1953-12-29 Brown Brockmeyer Company Selector switch

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3098130A (en) * 1958-06-19 1963-07-16 Electro Commutation L Electric switches
DE1213515B (de) * 1958-06-19 1966-03-31 Electrocommutation Elcom Sa L Elektrischer Umschalter
US3183464A (en) * 1959-12-21 1965-05-11 Sony Corp Tuner device for a radio or television receiving apparatus
US3221111A (en) * 1961-12-16 1965-11-30 Philips Corp Hearing aid construction

Also Published As

Publication number Publication date
CH329534A (de) 1958-04-30
DE1049471B (en, 2012)

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