US3809839A - Momentary switch with serpentine movable and coil spring stationary contacts - Google Patents

Momentary switch with serpentine movable and coil spring stationary contacts Download PDF

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Publication number
US3809839A
US3809839A US00323012A US32301273A US3809839A US 3809839 A US3809839 A US 3809839A US 00323012 A US00323012 A US 00323012A US 32301273 A US32301273 A US 32301273A US 3809839 A US3809839 A US 3809839A
Authority
US
United States
Prior art keywords
contact member
push
button
switch
coil spring
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
US00323012A
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English (en)
Inventor
S Beddoe
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.)
Plessey Overseas Ltd
Original Assignee
Plessey Handel und Investments AG
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 Plessey Handel und Investments AG filed Critical Plessey Handel und Investments AG
Application granted granted Critical
Publication of US3809839A publication Critical patent/US3809839A/en
Assigned to PLESSEY OVERSEAS LIMITED reassignment PLESSEY OVERSEAS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PLESSEY HANDEL UND INVESTMENTS AG, GARTENSTRASSE 2, ZUG, SWITZERLAND
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
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
    • H01H13/506—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member with a make-break action in a single operation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
    • H01H1/242—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting the contact forming a part of a coil spring

Definitions

  • ABSTRACT An electric switch of the push-button type affording a momentary switching action comprising a springbiased push-button which in response to the depression thereof causes a cam surface to bear against a springing moving contact member initially to produce bowing of the member so that it makes electrical contact with a fixed contact member in the form of a coil spring and thereafter during the depression of the push-button to permit the compressive forces in the contact member to be released suddenly by snap deflection of the member as it rides over the cam surface thereby to interrupt electrical contact with the member by the straightening of the moving contact member.
  • an electric switch of the push-button type affording a momentary switching action comprising a spring biased push-button which in response to the depression thereof causes a cam surface to bear against a springy moving contact member of the switch initially to produce bowing of the said contact member so that it makes electrical contact with or disengages from a fixed contact member and thereafter during the depression of the push-button to permit the compressive forces in the contact member to be released suddenly by snap deflection of the member as it rides over the cam surface thereby to interrupt or restore electrical contact with the fixed contact member by the straightening of the moving contact member.
  • the fixed contact member preferably comprises a coil spring which also serves as the biasing spring for the push-button in which case the springy moving contact member may be positioned at least partially inside the coil spring so that the moving contact member as it bows under the action of the cam makes contact with the inside of the coil spring.
  • FIGURE drawing shows a diagrammatic crosssectional view of a key-switch according to the invention.
  • the switch comprises an insulating body 1 which accommodates a coiled spring 2 biasing a push-button key 3 upwards as shown.
  • This spring 2 also forms the fixed contact member of the switch.
  • the moving contact member consists of a strip of springy metal 4 which is pre-bent into a serpentine shape.
  • the fixed and moving contact members have 2 terminal parts 5 and 6 respectively, the base of the body 1.
  • the push-button key 3 is depressed against the action of the spring 2.
  • the push-button has a concave cam surface 7 on its underside which bears down upon the turned over head of the springy strip 4 and by so doing the centre part of the strip 4 bows outwards until it engages with the inner surface of the spring 2.
  • closure of the switch contacts is effected but having made contact with the coil spring the force exerted on the strip 4 by continued downward movement of the push button 3 causes the head of the strip 4 suddenly to move up the cam surface 7 into the cavity 8 and in so doing the springy strip 4 restores substantially to its pre-bent shape as illustrated so that it disengages from the spring 2 and thereby breaks electrical contact therewith. It will therefore be appreciated that the switch affords a momentary make action.
  • the button After release of the push-button 3 the button is restored to the position illustrated and the head of the strip 4 accordingly moves out of the cavity 8 so that the top of strip 4 deflects to the right as viewed in the drawing and takes up the position illustrated.
  • the switch according to the invention is a very simple construction and although a switch having momentary make action has been described, a change-over or break switching action could alternatively be provided.
  • An electric switch of the push-button type affording a momentary switching action during activation of the switch, the switch comprising a spring-biased pushbutton which in response to the depression thereof causes a cam surface to bear against a springy moving contact member of the switch initially to produce bowing of said contact member so that it makes electrical contact with or disengages from the inside of a coil spring constituting a fixed contact member and thereafter during the depression of the push-button to permit the compressive forces in the moving contact member to be released suddenly by snap deflection of the member as it rides over the cam surface thereby to interrupt or restore electrical contact with the fixed contact member by the straightening of the moving contact member.

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  • Push-Button Switches (AREA)
US00323012A 1972-01-19 1973-01-26 Momentary switch with serpentine movable and coil spring stationary contacts Expired - Lifetime US3809839A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB268272A GB1372927A (en) 1972-01-19 1972-01-19 Electric switches

Publications (1)

Publication Number Publication Date
US3809839A true US3809839A (en) 1974-05-07

Family

ID=9743923

Family Applications (1)

Application Number Title Priority Date Filing Date
US00323012A Expired - Lifetime US3809839A (en) 1972-01-19 1973-01-26 Momentary switch with serpentine movable and coil spring stationary contacts

Country Status (5)

Country Link
US (1) US3809839A (sv)
DE (1) DE2302699A1 (sv)
FR (1) FR2168466A1 (sv)
GB (1) GB1372927A (sv)
IT (1) IT976918B (sv)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52144783A (en) * 1976-05-28 1977-12-02 Nesutetsuku Kk Switch
US4090053A (en) * 1974-10-30 1978-05-16 Anton Schaumann Spring contact switch assembly
US4406931A (en) * 1982-06-23 1983-09-27 Amp Incorporated Joystick switch
US4599497A (en) * 1983-04-15 1986-07-08 Amp Incorporated Single and dual in-line package switch
US4612422A (en) * 1983-04-15 1986-09-16 Amp Incorporated Single in-line package switch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3018810A1 (de) * 1980-05-16 1981-11-26 Preh, Elektrofeinmechanische Werke, Jakob Preh, Nachf. Gmbh & Co, 8740 Bad Neustadt Drucktastenschalter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153130A (en) * 1961-06-07 1964-10-13 Bell Telephone Labor Inc Momentary contact switch
CH440419A (de) * 1964-07-14 1967-07-31 Olympia Werke Ag Tastenschalter mit mechanischer Schaltzeitsteuerung
US3699296A (en) * 1971-05-21 1972-10-17 Ibm Catastrophically buckling compression column switch and actuator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153130A (en) * 1961-06-07 1964-10-13 Bell Telephone Labor Inc Momentary contact switch
CH440419A (de) * 1964-07-14 1967-07-31 Olympia Werke Ag Tastenschalter mit mechanischer Schaltzeitsteuerung
US3699296A (en) * 1971-05-21 1972-10-17 Ibm Catastrophically buckling compression column switch and actuator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM Technical Disclosure, Vol. 14, No. 6, p. 1865, 11/1971; Wire Contact Data Entry Keyboard Mechanism ; by Harris (II). *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4090053A (en) * 1974-10-30 1978-05-16 Anton Schaumann Spring contact switch assembly
JPS52144783A (en) * 1976-05-28 1977-12-02 Nesutetsuku Kk Switch
JPS5639487B2 (sv) * 1976-05-28 1981-09-14
US4406931A (en) * 1982-06-23 1983-09-27 Amp Incorporated Joystick switch
US4599497A (en) * 1983-04-15 1986-07-08 Amp Incorporated Single and dual in-line package switch
US4612422A (en) * 1983-04-15 1986-09-16 Amp Incorporated Single in-line package switch

Also Published As

Publication number Publication date
GB1372927A (en) 1974-11-06
IT976918B (it) 1974-09-10
DE2302699A1 (de) 1973-07-26
FR2168466A1 (sv) 1973-08-31

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