US2346730A - Switch for electrothermal apparatus - Google Patents

Switch for electrothermal apparatus Download PDF

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Publication number
US2346730A
US2346730A US456931A US45693142A US2346730A US 2346730 A US2346730 A US 2346730A US 456931 A US456931 A US 456931A US 45693142 A US45693142 A US 45693142A US 2346730 A US2346730 A US 2346730A
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US
United States
Prior art keywords
cam
switch
segment
brushes
contacts
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
US456931A
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English (en)
Inventor
Challet Etienne
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.)
ENTPR S ELECTR FRIBOURGEOISES
ENTREPRISES ELECTRIQUES FRIBOURGEOISES
Original Assignee
ENTPR S ELECTR FRIBOURGEOISES
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 ENTPR S ELECTR FRIBOURGEOISES filed Critical ENTPR S ELECTR FRIBOURGEOISES
Application granted granted Critical
Publication of US2346730A publication Critical patent/US2346730A/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
    • 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
    • H01H19/11—Movable parts; Contacts mounted thereon with indexing means

Definitions

  • the object of the present invention is a switch for electro-thermal apparatuses, comprising fixed elastic brushes operating with contacts provided on a rotary shaft, which latter, in order to insure its working positions, carries an undulated cam cooperating with rollers bearing elastically on its periphery.
  • This switch is characterized in that the shaft is provided with contacts presenting each one a segment, both ends of which are curved inwards, and which extends over an angle slightly smaller than that separating two consecutive tops of the cam, and in that the brushes cooperating with these contacts are set in such a Way that they act on the curved-parts of the segmenta little before the rollei scome to bear on the tops of the cam.
  • Fig. l is an elevation view and Fig. 2 a horizontal section along the plane BB of Fig. 1.
  • Fig. 3 is a section in larger scale along-the plane A-A of Fig. 1.
  • Fig. 4 shows the wiring diagram of the switch according to the embodiment.
  • Fig. 5 is an alternative of this diagram.
  • Figs. 6 and 7 show a side viewand an elevation view or" a detail in larger scale.
  • Figs. 8 to 11 represent another detail in four difierent working 'positions.
  • the embodiment shown comprises a base I in insulating material to which is attached a metallic U-shaped frame 2.
  • Each one of the two, vertical branches of this frame is provided with a bearing in which revolves a shaft 3 carrying two rings 4, of equal diameter, and contacts 5 mounted on both sides of each of the rings and constituted by segments having an outer diameter larger than the ring.
  • the segment contacts on each side of the rings are displaced in respect with one another, this angular deviation being shown particularly in the diagram of Fig. 4.
  • Two main elastic brushes 6, fixed to the base I on one of its sides parallel to the shaft 3, extend vertically and bear on both rings, while the elastic brushes 1, II and L, mounted on the other side of the base, cooperate with the segment contacts 5.
  • One of the ends of the shaft 3 extends beyond its bearing in the corresponding branch of the frame and carries, outside of the latter, an undulated cam l and an actuating knob or lever not shown.
  • the three elastic brushes I, II and L are each formed by an elastic blade I l, and by a conductive part presenting a convex portion intended to cooperate with the segment contacts 5 cf the rotary shaft.
  • the conductive part is made of a strip l2 fixedunder the elastic blade, and of a U-shaped piece l3, attached by its branches on the strip and Whose middle part constitutes the above mentioned convex portion.
  • This switch whose diagram is represented in Fig. 4, operates in the following manner:
  • Both main brushes are always in contact with the two rings 4, whereas the elastic brushes, 1, II and L, the first and the second one of which are connected with two equal resistances, establish an intermittent contact with the segments 5, in order to connect the said resistances in parallel or in series, or to disconnect one of these resistances, according to the angular posi tion of the rotary shaft.
  • each segment contact extends over an angle slightly smaller than that separating two consecutive tops of the cam; and the two ends of the segments are curved inwards.
  • the contacting positions between brushes and segments coincide with contacting positions between the rollers and the hollows of the cam.
  • the extremely light construction of the elastic brushes facilitates this operation by permitting to utilize almost the whole strength of the spring blade to push the segment contact at the start and thus to pass the dead point of the cam; in addition, a very slight efiort will be necessary to overcome the inertia of the brush when the segment contact is being pushed under the latter.
  • the rings present a groove in which the ends of the brushes, in shape of sector of tore, come to bear. This disposition prevents the start 3 from sliding in its bearing and avoids the short circuit that would result therefrom.
  • the above described switch is not limited to the application given in the diagram of Fig. 4. It can also be constructed to realize four different connections without losing the advantage of having at least two breaks for each disconnection.
  • This alternative which will be realized by changing the number and the arrangement of the segment contacts 5, is shown schematically in Fig. 5.
  • the elastic brushes I and II would be connected with two different resistances, each of which could be used singly, or which could be connected in parallel or in series.
  • a combination-switch for electro-thermal apparatuses comprising fixed elastic brushes cooperating with a contacting device mounted on a rotary shaft, which latter, in order to secure its working positions, carries an undulated cam cooperating with rollers bearing elastically on its periphery, in combination, segment contacts mounted on said contacting device, curved inwards at both ends and extending over an angle slightly smaller than that separating two consecutive tops of the cam, the brushes cooperating withthese contacts being set in such a way that they act upon the curved parts of the segment a little before the rollers come to bear on the tops of the cam.
  • a combination-switch for electro-thermal apparatuses comprising fixed elastic brushes cooperating with a contacting device mounted on a rotary shaft, which latter, in order to secure its working positions, carries an undulated cam cooperating with rollers bearing elastically on its periphery, in combination, segments contacts mounted on said contacting device, curved inwards at both ends and extending over an angle slightly smaller than that separating two consecutive tops of the cam, the brushes cooperating with these contacts being set in such a way that they act upon the curved parts of the segment a little before the rollers come to bear on.
  • each brush being made of an elastic blade and of a conductive part presenting a convex portion intended to cooperate with the contacts of the rotary shaft, this conductive part being constituted by a strip attached to the elastic blade and by a U-shaped piece fixed by its branches on the strip and whose middle part forms the above mentioned convex portion.
  • a combination-switch for electro-thermal apparatuses comprising fixed elastic brushes cooperating with a contacting device mounted on a rotary shaft, which latter, in order to secure its working positions, carries an undulated cam cooperating with rollers bearing elastically on its periphery, in combination, segment contacts mounted on said contacting device, curved inwards at both ends and extending over an angle slightly smaller than that separating two consecutive tops of the cam, the brushes cooperating with these contacts being set in such a way that they act upon the curved parts of the segment a little before the rollers come to bear on the tops of the cam, said contacting device comprising contacting rings whose periphery presents a groove in which the tore-sector-shaped contacting piece of the corresponding brushes comes to bear.

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  • Mechanisms For Operating Contacts (AREA)
US456931A 1941-06-21 1942-09-01 Switch for electrothermal apparatus Expired - Lifetime US2346730A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH888405X 1941-06-21

Publications (1)

Publication Number Publication Date
US2346730A true US2346730A (en) 1944-04-18

Family

ID=4545476

Family Applications (1)

Application Number Title Priority Date Filing Date
US456931A Expired - Lifetime US2346730A (en) 1941-06-21 1942-09-01 Switch for electrothermal apparatus

Country Status (4)

Country Link
US (1) US2346730A (fr)
CH (1) CH222358A (fr)
ES (1) ES172310A1 (fr)
FR (1) FR888405A (fr)

Also Published As

Publication number Publication date
FR888405A (fr) 1943-12-13
ES172310A1 (es) 1946-03-01
CH222358A (fr) 1942-07-15

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