US3864654A - Electrical switches - Google Patents

Electrical switches Download PDF

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Publication number
US3864654A
US3864654A US382382A US38238273A US3864654A US 3864654 A US3864654 A US 3864654A US 382382 A US382382 A US 382382A US 38238273 A US38238273 A US 38238273A US 3864654 A US3864654 A US 3864654A
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US
United States
Prior art keywords
vane
embossments
recesses
strip
electrical switch
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
US382382A
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English (en)
Inventor
David Charles Bradbury
George Henry Brown
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.)
Lucas Electrical Co Ltd
Original Assignee
Lucas Electrical Co Ltd
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 Lucas Electrical Co Ltd filed Critical Lucas Electrical Co Ltd
Application granted granted Critical
Publication of US3864654A publication Critical patent/US3864654A/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
    • H01H61/00—Electrothermal relays
    • H01H61/06—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts
    • H01H61/066—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts making use of an extensible wire, rod or strips

Definitions

  • An electrical switch of the intermittently operating type comprises a resilient metal vane carrying a heat- 30 Foreign Application p i i m extensible metal strip and a movable contact electri- July 25 1972 GM England 34684, cally connected wlth the strip.
  • the movable contact 1s movable towards and away from a fixed contact as the [52] CL 337/135 337/141 resilient vane flexes as permitted by the metal strip.
  • [5 l] IL Cl. i 6mm The vane is of rectangular form and the metal strip is [58] Field of I41 39] connected at its ends to diagonally opposite corners thereof.
  • the vane is provided with two sets of embossments thereon.
  • One set of embossments is shallower [56] Raferences Cited than the other set and is formed to project from one surface of the vane whilst the other set of embossment 2 166 238 SDTATES PATENTS 33 I X projects from the other surface of the vane.
  • This invention relates to electrical switches of the intermittently operating type. Such switches are commonly used in direction indicator control circuits for motor vehicles. More particularly, the invention relates to an electrical switch of the intermittently operating type which comprises a body. a fixed contact on the body, a resilient vane mounted on the body to be flexed between a first position and a second position.
  • the vane being embossed so that flexing occurs with a snap ac tion and so that the vane is inherently biased into its second position, a contact movable with the vane and arranged to engage the fixed contact when the vane is in one of its positions and to be disengaged with the fixed contact when the vane is in the other of its positions, and a heat extensible, electrically conducting strip connected to the vane so as to hold the latter in its first position when the strip is unheated but to allow the vane to snap into its second position when the strip is heated, said strip being electrically connected between the movable contact and a terminal on the body.
  • Such an electrical switch will hereinafter be referred to as an electrical switch as defined herein.
  • the vane is embossed by striking one side of the vane with a tool so that recesses are formed therein which define projections on the opposite side of the vane.
  • the vane is of rectanguiar shape and the strip is attached to diagonally opposed edges of the vane.
  • the recesses are of elongate form and are axially spaced apart on the diagonal joining of the two aforesaid corners of the vane.
  • An object of the present invention is to provide an electrical switch as defined herein in which the abovementioned disadvantage is obviated or mitigated.
  • an electrical switch as defined herein, wherein the vane is formed with two sets of embossments thereon, one set of embossments being formed by recesses formed in one surface of the vane so as to define projections on the other surface of the vane and the other set of embossments being formed by recesses in the said other surface of the vane so as to define projections on the said one surface of the vane.
  • the recesses of the said one set of embossments are shallower than the recesses of the said other set of embossments.
  • the vane is of rectangular form
  • the ends of the heat extensible strip are respectively connected to diagonally opposite corners of the vane so that the strip extends diagonally across the said one surface of the vane
  • the recesses of the said other set of embossments comprise a pair of longitudinally spaced elongate recesses on the diagonal joining the said diagonally opposite corners of the vane
  • the recesses of the said one set of embossments comprise a pair of longitudinally spaced elongate recesses extending along the diagonal joining the other diagonally opposite corners of the vane.
  • FIG. I is an end view of an electrical switch as defined herein, according to the present invention.
  • FIG. 2 is a plan view of the underside of the vane shown in FIG. I,
  • FIG. 3 is a plan view from above of the vane shown in FIG. 2,
  • FIG. 4 is a side elevational view of the electrical switch according to the present invention depicting the vane in its first position thereof;
  • FIG. 5 is a side elevational view of the electrical switch of the invention depicting the vane in a second position thereof;
  • FIG. 6 is a perspective illustration of the top side of the vane similar to that depicted in FIG. 3;
  • FIG. 7 is a sectional view of the vane of FIG. 6 taken along lines 7-7 thereof illustrating the direction of projection of the vane embossments.
  • the electrical switch comprises a body 10 having a pair of terminals II and I2 mounted thereon.
  • the terminal II is electrically con nected with a stud-type fixed contact I3 having a contact pad 14 carried thereon.
  • the terminal 12 is electrically connected with a metal support plate I5 having an integral post I6 extending therefrom.
  • a spring steel vane 17 of rectangular form is tack welded to the post 16 at a point 18 which is intermediate the ends of one of the longitudinal edges of the vane I7.
  • the vane 17 has a heat extensible, electrically conducting metal strip 19 extending diagonally across one surface thereof.
  • the strip 19 is connected at its ends 20 and 21 with diagonally opposed corners 22 and 23, respectively. of the vane 17.
  • the vane I7 is provided with embossments thereon in the form of two pairs of recesses 24 and 25.
  • the set of recesses 24 are formed in the said other surface of the vane 17, i.e., that surface of the vane opposite to the surface over which the strip [9 extends, so as to define projections on said one surface of the vane 17.
  • FIG. 3 FIG.
  • the recesses 24 are of elongate form, are longitudinally spaced apart, and extend along the diagonal of the vane joining the corners 22 and 23 thereof.
  • the other set of recesses 25 are formed in the said one surface of the vane 17 so as to define projections on the said other surface of the vane 17, i.e., that surface of the vane opposite to the strip 19 as best shown in FIG. 7.
  • the set of recesses 25 are of elongate form, are spaced apart longitudinally on the diagonal joining the remaining two diagonally opposed corners 26 and 27 of the vane I7 and are shallower than the recesses 24.
  • the embossments on the vane I7 as described above is such that the latter can be flexed be tween a first position as shown in FIGS. I and 4, and a second position as shown in FIG. 5 so that movement of the vane 17 between the positions occurs with a snap action. Furthermore. the embossments cause the vane to be inherently biassed into its second position. However, the length of the strip 19 is so arranged that it holds the vane I7 in its first position (as shown in FIG. I and FIG. 4) when the strip 19 is unheated. When strip I9 is heated due to passage of current therealong, it extends and permits the vane 17 to snap into its second position. Referring to FIG.
  • the strip 19 is provided with a central contact 28 which is electrically connected with the vane 17 via the strip 19 whose ends 20 and 2! are connected with the corners 22 and 23 of the vane l7 as described herein above.
  • the contact 28 is thus mounted for movement with the vane 17 and is electrically connected with the terminal 12 since the vane 17 is electrically connected with the support plate 15 via the integral post 16.
  • the vane 17 is normally held in its first position by the strip 19.
  • the contact 28 engages the contact pad 14 of the fixed contact 13 and thereby causes the terminals H and 12 to be interconnected through the intermediary of the strip I9.
  • the effect of the current passing through strip 19 causes the latter to be heated and therefore to extend.
  • Extension of the strip 19 causes. as described above, the vane l7 to snap into its second position (see FIG. 5) in which the contact 28 is disengaged from the fixed contact 13. In the second position.
  • An electrical switch of the intermittently operating type comprising a body. a fixed contact on said body, a resilient. rectangular vane mounted on said body to be flexed between a first position and a second position. said vane being embossed so that flexing occurs with a snap-action and so that said vane is inherently biased into its second position. a contact movable with said vane and arranged to engage said fixed contact when said vane is in one of its positions and to be displaced from said fixed contact when said vane is in the other of its positions. and a heat extensible. electrically conducting strip connected to diagonally opposite corners of said vane so as to hold the latter in its first position when said strip is unheated but to allow said vane to snap into its second position when said strip is heated.
  • said strip being electrically connected with said movable contact and a terminal on said body.
  • said vane is formed with two sets of embossments thereon. one set of embossments being formed by recesses formed in one surface on said vance so as to define projections on the other surface of said vane. and the other set of embossments being formed by recesses in said other surface of said vane so as to define projec tions on said one surface of said vane.
  • said recesses of said other set of embossments comprising a pair of longitudinally spaced elongate recesses on the diagonal joining said diagonally opposite corners of said vane
  • said recesses of said one set of embossments comprising a pair of longitudinally spaced elongate recesses extending along the diagonal joining the other diagonally opposite corners of said vane.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Breakers (AREA)
  • Tumbler Switches (AREA)
US382382A 1972-07-25 1973-07-25 Electrical switches Expired - Lifetime US3864654A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3468472A GB1421158A (en) 1972-07-25 1972-07-25 Electrical switches

Publications (1)

Publication Number Publication Date
US3864654A true US3864654A (en) 1975-02-04

Family

ID=10368684

Family Applications (1)

Application Number Title Priority Date Filing Date
US382382A Expired - Lifetime US3864654A (en) 1972-07-25 1973-07-25 Electrical switches

Country Status (9)

Country Link
US (1) US3864654A (pl)
JP (1) JPS5444104B2 (pl)
AU (1) AU474343B2 (pl)
BR (1) BR7305439D0 (pl)
CA (1) CA988133A (pl)
DE (1) DE2337503C3 (pl)
FR (1) FR2194039B1 (pl)
GB (1) GB1421158A (pl)
IT (1) IT989966B (pl)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2166238A (en) * 1939-07-18 Movement-producing device
US2861149A (en) * 1956-02-09 1958-11-18 Sylvania Electric Prod Snap action switch
US2870292A (en) * 1957-06-06 1959-01-20 Hoda Corp Snap action device
US3218415A (en) * 1960-12-20 1965-11-16 Tung Sol Electric Inc Thermally actuated snap action device
US3711808A (en) * 1970-10-28 1973-01-16 Mitsubadenkiseisak Usho Co Ltd Snap operating device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE563880A (pl) * 1951-07-21
FR1298056A (fr) * 1960-12-20 1962-07-06 Tung Sol Electric Inc Commutateur à action rapide

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2166238A (en) * 1939-07-18 Movement-producing device
US2861149A (en) * 1956-02-09 1958-11-18 Sylvania Electric Prod Snap action switch
US2870292A (en) * 1957-06-06 1959-01-20 Hoda Corp Snap action device
US3218415A (en) * 1960-12-20 1965-11-16 Tung Sol Electric Inc Thermally actuated snap action device
US3711808A (en) * 1970-10-28 1973-01-16 Mitsubadenkiseisak Usho Co Ltd Snap operating device

Also Published As

Publication number Publication date
IT989966B (it) 1975-06-10
JPS5444104B2 (pl) 1979-12-24
GB1421158A (en) 1976-01-14
FR2194039A1 (pl) 1974-02-22
FR2194039B1 (pl) 1978-08-11
JPS4958370A (pl) 1974-06-06
DE2337503C3 (de) 1978-09-28
CA988133A (en) 1976-04-27
AU474343B2 (en) 1976-07-22
AU5800373A (en) 1975-07-10
DE2337503B2 (de) 1978-01-26
BR7305439D0 (pt) 1974-08-22
DE2337503A1 (de) 1974-02-14

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