US3739127A - Keyboard pulse switch - Google Patents

Keyboard pulse switch Download PDF

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Publication number
US3739127A
US3739127A US00227058A US3739127DA US3739127A US 3739127 A US3739127 A US 3739127A US 00227058 A US00227058 A US 00227058A US 3739127D A US3739127D A US 3739127DA US 3739127 A US3739127 A US 3739127A
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United States
Prior art keywords
terminal
trip member
actuator
contact
movement
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
US00227058A
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English (en)
Inventor
E Long
W Cherry
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.)
Cherry Corp
Original Assignee
Cherry Electrical Products Corp
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.)
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Publication date
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Publication of US3739127A publication Critical patent/US3739127A/en
Assigned to CHERRY CORPORATION THE reassignment CHERRY CORPORATION THE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE JULY 14, 1986 Assignors: CHERRY ELECTRICAL PRODUCTS CORPORATION
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
    • 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

Definitions

  • a spring contact is stressed by [56] References Cited the trip member, and when released springs into m0- UNITED STATES PATENTS mentary contact with a stationary contact with a sta- Y tionary terminal.
  • the spring contact may be coated gz g zf with lead, tin, or other dense material to absorb and re- 3:662:l38 5 1972 111111155151. 200 160 bmmce of the Contact 2,004,610 6/1935 Jones 200/166 H UX 7 Claims, 7 Drawing Figures PMENTE l] 21975 KEYBOARD PULSE swrrcu SUMMARY OF THE INVENTION
  • An electric switch adapted to be associated with a keyboard type switch assembly and having a momentary circuit-making pulse.
  • the switch includes a reciprocal movable elongated actuator, a stationary terminal, and a second terminal biased in a predetermined spaced position relative to the fixed terminal, with the second terminal being physically moved against its bias and farther away from the fixed terminal by a pivotal trip member carried by and moved with the actuator.
  • the trip lever has one end in contact with one of the circuit-making contacts at a point below its centerline as well as beneath the point of pivotal connection to the actuator. This arrangement results in a line of forced movement between the lever and the circuit-making contact which increases as the actuator is moved in one direction and the point of pivotal connection between the lever and the actuator approaches the line of contact between the lever and the circuit-making contact.
  • the actuator member moves the trip member over a cam surface provided by the second terminal to a point of forced reactance where the trip member is uncontrollably pivoted free of contact with the second terminal, permitting it to overreact through the kinetic energy developed therein by an increased biased loading of the trip member as it moves over the cam surface of the second terminal, such that when the second terminal is freed from the trip member, it will strike momentarily the fixed contact, establishing a single electrical pulse therebetween.
  • FIG. 1 is a perspective view of the keyboard pulse switch
  • FIG. 2 is a detailed side elevational view of the pulse switch of this invention in its normal or raised position
  • FIG. 3 is a fragmentary detailed sectional view similar to FIG. 2, but showing the parts in an intermediate actuated position;
  • FIG. 4 is a fragmentary sectional detailed view similar to FIG. 3, showing the parts in yet another actuated position;
  • FIG. 5 is a fragmentary sectional detailed view similar to FIG. 4, showing the parts thereof in a position during the return of the switch actuator and trip lever;
  • FIG. 6 is an enlarged perspective view of the components of the invention in an exploded relation.
  • FIG. 7 is a detailed sectional view showing the interior of the housing for such switch.
  • This invention relates to a push-button type switch which may be readily used in what is known as keyboard equipment utilized in computers, data processing machines, calculators, and electric typewriters.
  • the object of this invention is to provide in such a switch assembly a means whereby a single electrically energized pulse is established between current conductive terminals, with the switch providing by its structural and component arrangements a teaseproof yet positive switching action as desired.
  • the keyboard pulse switch 10 of this invention is shown as including a hollow housing 11, the normally open base thereof being closed by a base plate 12.
  • the top wall 13 of the housing 11 provides a central rectangularly shaped opening 14 through which the stem 15 of an actuator 37 is adapted to be reciprocally moved.
  • the free or exposed end of the actuator stem carries a cap 16 having a configuration as required by the environment in which the switch 10 is placed.
  • the base plate 12 on one face thereof provides a raised platform 17 which includes adjacent to one side edge, parallel grooves 18 and 19 which have a portion thereof extending through the base 12 so that certain hereinafter defined terminal ends may be journalled so as to be positioned exteriorly of the switch housing 10.
  • a center recess 20 is formed in the platform 17 and is positioned between the grooves 18 and 19 and a raised generally rectangularly shaped lug 21.
  • a fixed terminal plate 22 Adapted to be mounted on the base plate 12 is a fixed terminal plate 22 which provides on its bottom edge 23 a depending terminal 24 adapted to project through the groove 18 so as to be disposed beneath the base 12 as shown in FIGS. 1 and 2 through 5.
  • the upper edge of the fixed terminal 22 provides a head 25 which is adapted to be projected into a retaining recess 26 formed on the inner wall surface 27 of the top wall 13 of the housing 11.
  • This terminal 28 provides an enlarged base portion 29 which is received in the groove 19 and from which depends a terminal 30 adapted to be projected through the base 12 so as to be exposed therefrom as shown in FIGS. 1 and 2 through 5.
  • an arm 32 Extending laterally from one longitudinal edge 31 of the terminal 28 is an arm 32 which is preformed to provide a cam surface which consists of a flat face 33 that extends obliquely with respect to the longitudinal plane of the terminal 28 and which terminates at its lower edge into an angularly reversely bent face 34.
  • the switch includes as an operative component the actuator 37, which actuator comprises a generally rectangularly shaped body 38 at the lower end of the stem 15 and also providing a frictional insert 39 adapted to be pressfitted into the hollow internal shank 40 of the cap 16 of the switch.
  • the bottom edge of the body 38 of the actuator 37 is notched as at 41 to provide a longitudinally extending center stud 42.
  • each longitudinal side edge of the body 38 adjacent to either side of the center stud 42 are guide lugs 43 which are adapted to project into opposing channels 44 formed on the inner wall surfaces of the side walls of the housing 11, as shown in FIG. 7.
  • a pair of laterally extending shoulders 45 and 46 are also formed on the opposite longitudinal side edges of the body 38 of the actuator 37 at a point approximately in the middle line thereof. These shoulders, like the lugs 43, are adapted to project into and move through the channels 44.
  • trip lever 50 Between the shoulder 46 and the lug 43 and mounted upon a pin 49, is a trip lever 50.
  • This trip lever 50 provides a reduced cam face 51 at one end thereof, with the cam face 51 lying below the plane of a centerline drawn through the trip lever 50 as well as beneath the aperture 52 formed in the trip lever 50 which receives the pivot pin 49.
  • a stop flange 53 Adjacent the opposite end of the trip lever 50 and formed on the upper longitudinal edge thereof, is a stop flange 53.
  • This stop flange 53 is of a height equal to the thickness of the stop piece 48, so that when the trip lever 50 is mounted on the actuator 37 and the switch is in its normal position, the stop piece 48 will engage the upper longitudinal edge 54 of the trip lever 50, while the stop flange 53 will engage the under wall surface of the top 13 of the switch housing 11, as seen in FIG. 2.
  • the actuator is maintained in its normal position as shown in FIG. 2 by a coil spring 55 which has one end disposed within the center recess of the base 12, while its opposite end embraces the stud 42 provided adjacent the bottom edge of the actuator 37.
  • the cam face 51 In its normal or rest position and with the parts related to one another as depicted in FIG. 2, the cam face 51 will be in engagement with the flat face 33 of the arm 32 provided by the terminal 28. In this position the contact heads 35 and 36 of the terminals 22 and 28 are spaced apart and out of contact with each other.
  • the plunger or actuator 37 As the plunger or actuator 37 is depressed by an external force applied against the cap 16, the actuator 37 together with the trip lever 50 will move inwardly of the housing 11 in the direction of the base 12 against the tension of the spring 55.
  • the cam face 51 of the trip lever 50 will ride upon the flat face 33 of the arm 32 of the terminal 28 and because of its formation a camming effect will take place, causing the terminal 28 to be spring-loaded in a direction away from the fixed terminal 22. Because of the relation between the pivotal connection of the trip finger 50 with the pivot pin 49 and the cam face 51 thereof, the trip lever 50 will remain in its generally transverse plane with respect to the longitudinal axis of the actuator 37 during this initial movement as
  • the bottom edge of the trip lever 50 will engage the upwardly projecting lug 21 provided by the base 12, causing the trip lever 50 to pivot in an anti-clockwise direction as shown in FIG. 4, causing the cam face 51 thereof to ride off the flat face cam surface 33 of the arm 32 and to extend beneath the reversely bent face 34 thereof.
  • the reaction of the terminal 28 will be such that it effects an almost uncontrollable pivoting of the trip lever 50 out of contact with the arm 32 of the terminal 28, as shown in FIG. 4.
  • the freed spring-loaded terminal will then move with a sufficient reaction beyond its original biased position, such that its contact head 35 will strike the contact 36 of the terminal 22, causing a momentary electrical tioned terminal 28 is principally one of action and reac-.
  • the trip lever 50 will move upwardly with the actuator 37, and the cam face 51 thereof will be restrained by its engagement with the face 34 of the cam surface of the arm 32 until the uppermost corner of the stop flange 53 engages the under side of the top wall 13 of the housing 11, as seen in FIG. 5, so as to act as a pivot point for the trip lever 50 as it is caused to move upwardly with the actuator 37 until it resumes its original position as seen in FIG. 2.
  • An electrical push-button pulse switch having a hollow housing for a stationary contact-bearing terminal, a second contact-bearing terminal having a free end biased in the direction of but spaced from the stationary terminal, and an elongated actuator reciprocally movable in the housing, wherein the improvement comprises a. a trip member carried by the actuator and being of a length so as to extend beyond the longitudinal edges of the actuator and reciprocally movable therewith through the housing,
  • said trip member providing a pre-shaped end portion extending beyond one face of the actuator in the direction of and in contact with the second terminal to resiliently bend the free end of said terminal against its bias
  • An electrical push-button pulse switch as defined by claim 1 wherein said means on the free end of the second terminal comprises an arm extending laterally from one longitudinal edge of the second terminal adjacent to its free end and providing a surface angled downwardly and in the direction of the actuator and in the path of movement of said one end of said trip member.
  • trip member comprises a generally rectangularly shaped substantially fiat plate extending transveersely to either side of the actuator, said pre-shaped end portion of said trip member being tapered to a point below the centerline thereof and said means for pivotally connecting said trip member to the actuator so as to maintain a forced contact between said tapered end of said trip member and said means on the second terminal until said trip member is initially pivoted in the direction of movement of the actuator, permitting said forced contact to freely pivot with a snap action said tapered end of said trip member out of contact with the second terminal.
  • trip member comprises a generally rectangularly shaped substantially flat plate extending transversely to either side of the actuator, said pre-shaped end portion of said trip member being tapered to a point below the centerline thereof, and said means for pivotally connecting said trip member to the actuator so as to maintain a forced contact between said tapered end of said trip member and said means on the second terminal until said trip member is initially pivoted in the direction of movement of the actuator, permitting said forced contact to freely pivot with a snap action said tapered end of said trip member out of contact with the second terminal.

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  • Push-Button Switches (AREA)
US00227058A 1972-02-17 1972-02-17 Keyboard pulse switch Expired - Lifetime US3739127A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US22705872A 1972-02-17 1972-02-17

Publications (1)

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US3739127A true US3739127A (en) 1973-06-12

Family

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Application Number Title Priority Date Filing Date
US00227058A Expired - Lifetime US3739127A (en) 1972-02-17 1972-02-17 Keyboard pulse switch

Country Status (6)

Country Link
US (1) US3739127A (enrdf_load_stackoverflow)
JP (1) JPS4889363A (enrdf_load_stackoverflow)
DE (1) DE2230193A1 (enrdf_load_stackoverflow)
FR (1) FR2172069B3 (enrdf_load_stackoverflow)
GB (1) GB1345309A (enrdf_load_stackoverflow)
IT (1) IT960987B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866006A (en) * 1972-08-23 1975-02-11 Siemens Ag Pushbutton switch with reciprocating cam
US3902033A (en) * 1974-09-27 1975-08-26 Cherry Electrical Prod Momentary switch
US4764993A (en) * 1985-03-11 1988-08-23 American Brass & Aluminum Foundry Co. Inc. Two-position latchable drain valve
US5931289A (en) * 1998-03-10 1999-08-03 Eaton Corporation Circuit breaker with quick closing mechanism

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6025782Y2 (ja) * 1978-05-25 1985-08-02 アルプス電気株式会社 押釦スイツチ
DE3036336C2 (de) * 1980-09-26 1982-09-09 Triumph-Adler Aktiengesellschaft für Büro- und Informationstechnik, 8500 Nürnberg Tastatur in flacher Bauweise
JPS58176328U (ja) * 1982-05-21 1983-11-25 ナイルス部品株式会社 自動車用ストツプランプスイツチ

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866006A (en) * 1972-08-23 1975-02-11 Siemens Ag Pushbutton switch with reciprocating cam
US3902033A (en) * 1974-09-27 1975-08-26 Cherry Electrical Prod Momentary switch
US4764993A (en) * 1985-03-11 1988-08-23 American Brass & Aluminum Foundry Co. Inc. Two-position latchable drain valve
US5931289A (en) * 1998-03-10 1999-08-03 Eaton Corporation Circuit breaker with quick closing mechanism

Also Published As

Publication number Publication date
FR2172069B3 (enrdf_load_stackoverflow) 1975-10-03
GB1345309A (en) 1974-01-30
IT960987B (it) 1973-11-30
JPS4889363A (enrdf_load_stackoverflow) 1973-11-22
FR2172069A1 (enrdf_load_stackoverflow) 1973-09-28
DE2230193A1 (de) 1973-08-23

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AS Assignment

Owner name: CHERRY CORPORATION THE, STATELESS

Free format text: CHANGE OF NAME;ASSIGNOR:CHERRY ELECTRICAL PRODUCTS CORPORATION;REEL/FRAME:004610/0553

Effective date: 19860702

Owner name: CHERRY CORPORATION THE

Free format text: CHANGE OF NAME;ASSIGNOR:CHERRY ELECTRICAL PRODUCTS CORPORATION;REEL/FRAME:004610/0553

Effective date: 19860702