US3697706A - Push type electric switch with contact post, movable coil spring contact and interposed non conductive plunger - Google Patents
Push type electric switch with contact post, movable coil spring contact and interposed non conductive plunger Download PDFInfo
- Publication number
- US3697706A US3697706A US155752A US3697706DA US3697706A US 3697706 A US3697706 A US 3697706A US 155752 A US155752 A US 155752A US 3697706D A US3697706D A US 3697706DA US 3697706 A US3697706 A US 3697706A
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- United States
- Prior art keywords
- plunger
- pin
- movable contact
- contact
- face plate
- 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.)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H15/00—Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
- H01H15/02—Details
- H01H15/06—Movable parts; Contacts mounted thereon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/32—Insulating body insertable between contacts
-
- 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 A push-pull type electric switch for single or matrix switching applications comprising a fixed contact in the form of an elongated pin, and at least one movable contact biased to a closed position against the fixed contact.
- An insulative plunger is slidably mounted on the fixed contact and is axially movable thereon between a depressed position wherein it shifts the movable contact away from the fixed contact toan open position, and a retracted position wherein it permits the movable contact to assume its biased closed position against the fixed contact.
- the invention relates to a push-pull type electric switch, and more particularly to an electric switch suitable for single or matrix switching applications.
- the present invention is directed to a simple electric switch wherein standard or low cost molded components may be used.
- the switch of the present invention requires no critical assembly operations and, once assembled, all parts are captive.
- the switch may be provided with any desired form of face plate, and by simple removal of the face plate, all parts of the switch are accessible.
- the switch is characterized by a positive switching action, and the contacts are self-cleaning. When used with a printed circuit board, the board need have an etched pattern on one side only.
- Each switch of the present invention is capable of having more than one movable contact.
- the switch of the present invention is particularly adapted to matrix uses, since it is characterized by a high packing density.
- the switch of the present invention comprises an elongated pin-like fixed contact a movable contact biased against the pin and plunger means slidably mounted on the pin and axially movable between a position wherein it lies between the pin and the movable contact and a position wherein it is withdrawn from between the pin and the movable contact.
- the pin is affixed to a printed circuit board and makes electrical connection with the pattern on the board, as required.
- the movable contact comprises a helical spring, tensioned between two mounts affixed to the board. The spring mounts are so positioned on the board as to cause the spring to normally contact the pin.
- a plunger made of insulative material, is slidably mounted on the pin. The plunger has a tapered end so that as it is moved to its depressed position it shifts the spring or movable contact away from the pin.
- a face plate is provided in parallel spaced relationship to the printed circuit board.
- the free end of the plunger extends through a perforation in the face plate.
- Axial movement of the plunger along the pin in a direction toward the face plate may be limited by an annular flange on the plunger contacting the inner surface of the face plate.
- a cylindrical spacer is located about the pin and plunger in the space between the face plate and the spring or movable contact. This spacer limits movement of the spring in a direction toward the face plate.
- a cylindrical washer is provided about the pin and in the space between the spring or movable contact and the printed circuit board to limit movement of the spring in a direction toward the printed circuit board.
- the plunger may be provided with an annular groove adjacent its tapered end for a more positive engagement of the plunger and the movable contact or spring when the plunger is in its off position.
- the plunger may also have a colored band so located on its body as to show above the face plate when the plunger is in its on position.
- a single switch of the present invention may be provided with more than one spring contact, each spring contact being separated from the other by a panel of insulative material.
- a number of switches of the present invention may be located adjacent each other and may share the same common spring contact.
- a plurality of switches of the present invention may be applied to a matrix system, as for example the matrix system used in association with the setter boards of electric organs.
- any suitable means may be provided to actuate the plungers. They may, for example, simply be actuated by hand. The free ends of the plungers may be provided with knobs to assist hand actuation. Finally, the plungers may be actuated by other means such as the rocker tabs or tone color tabs of an electric organ.
- FIG. 1 is a fragmentary elevational view, partly in cross section, illustrating the switch of the present invention in its open position.
- FIG. 2 is a cross sectional view, taken along the section line 2-2 of FIG. 1, but illustrates the switch in its closed position.
- FIG. 3 is a fragmentary plan view, partly in cross section, illustrating a plurality of switches of the present invention utilizing a common movable contact.
- FIG. 4 is an elevational view of a plunger of the present invention provided with an annular groove.
- FIG. 5 is a fragmentary, elevational view, partly in cross section, and illustrating a face plate and a plunger of the present invention, the plunger being provided with a color band.
- FIG. 6 is a fragmentary plan view, partly in cross sec tion, illustrating a plurality of switches of the present invention as used in a matrix system.
- FIG. 7 is a fragmentary elevational view, partly in cross section, illustrating a switch of the present invention having two movable contacts.
- FIG. 8 is a fragmentary elevational view, partly in cross section, illustrating a face plate and a pair of plungers provided with knobs.
- FIG. 9 is a fragmentary elevational view, partly in cross section, illustrating a plunger of the present invention actuated by a rocker tab.
- FIG. 10 is a cross sectional view taken along the section line 10-10 of FIG. 9.
- FIG. 11 is a fragmentary elevational, partly in cross section, illustrating a plunger of the present invention actuated by a tone color tab.
- FIG. 12 is a fragmentary perspective view of the plunger and tone color tab of FIG. 11.
- FIG. 1 DESCRIPTION OF THE PREFERRED EMBODIMENTS
- the switch of the present invention is illustrated in its simplest form in FIG. 1 and 2.
- an etched board or printed circuit board is shown at 1.
- portion of a circuit is illustrated (of exaggerated thickness) on the rearward side of the board, as at 2.
- the pin 3 may be affixed to the printed circuit board 1 in any suitable manner.
- the rearward end of the pin is shown as passing through a perforation 1a in the printed circuit board. That portion of the rearward end of the pin which extends beyond the'rearward surface of the printed circuit board is upset to form a head 4, in the manner of a rivet or the like.
- the head 4 makes electrical contact with the printed circuit portion 2.
- the pin 3 is provided with an annular flange 5 which serves a number of purposes. First of all, the annular flange 5 determines the extent to which the rearward end of the pin extends through the perforation 1a. Secondly, the annular flange cooperates with the head 4 to firmly affix the pin 3 to the printed circuit board 1. An additional purpose of the flange 5 will be described hereinafter.
- a movable contact is illustrated at 6 in the form of a coil spring.
- the ends of the coil spring are affixed to mounts 7 and 8.
- the mounts 7 and 8 may be affixed to the printed circuit board by any suitable means.
- they are illustrated as affixed by rivets 9 and 10, respectively.
- the mounts 7 and 8 may either connect with the printed circuit on the board 1, or they may serve as terminals for external wiring.
- the rivet 9 is illustrated as making contact with a portion 11 of the printed circuit.
- the rivet 10 is illustrated as having a wire 12 connected thereto by soldering or the like.
- the mounts 7 and 8 are so positioned with respect to the pin 3 that the pin will lie in the normal axial path of the spring contact 6 between the mounts 7 and 8, with the result that the spring contact 6 will be biased into contact with the pin 3.
- a face plate 13 is affixed to the printed circuit board 1 by means of a plurality of supports, one of which is shown at 14. These supports maintain the face plate in parallel spaced relationship to the printed circuit board.
- the assembly of the face plate, the printed circuit board and the supports may be made in any suitable manner, as by screws 15 and 16.
- the face plate 13 has a perforation therein, indicated at 17. It will be noted from FIGS. 1 and 2 that the pin 3 extends part way through the perforation 17.
- a plunger, made of insulative material, is shown at 18.
- the plunger has a central bore 19 adapted to receive the pin 3 with a sliding fit.
- the plunger 18 is supported by the pin 3 and extends through the perforation 17 in the face plate 13.
- the rearward end of the plunger is provided with a tapered surface or nose portion 20.
- the body of the plunger is provided with an annular flange 21.
- the annular flange 21 is of greater diameter than the perforation 17 in the face plate, so that the uppermost or retracted position of the plunger is determined by the abutment of the rearward surface of the face plate 13 and the annular flange 21.
- the lowermost position of the plunger may be determined either by the bottoming of the pin 3 in the perforation 19 or by the abutment of the tapered nose 20 and the annular pin flange 5.
- the plunger 18 may also be provided with an annular groove 18a at its forward end. The annular groove may serve as means to assist manual actuation of the plunger, or it may serve as means for attachment of some other form of actuation means, as will be described hereinafter.
- a cylindrical spacer is shown at 22.
- the spacer 22 has an internal diameter slightly greater than the diameter of the plunger flange 21. It will be noted from FIGS. 1 and 2 that the spacer 22 is captively held by the plunger between the rearward surface of the face plate 13 and the spring contact 6.
- a cylindrical washer is shown at 23.
- the washer 23 has an internal diameter greater than the diameter of the plunger body and is captively held by the pin 3 between the spring contact 6 and the forward surface of the printed circuit board 1. Finally, it will be noted that the plunger 18 is captively held on the pin 3 by virtue of the cooperation of the rearward surface of the face plate 13 and the annular plunger flange 21.
- FIG. 2 illustrates the switch in its closed condition.
- the plunger is in is retracted position and the movable or spring contact 6 is free to make electrical contact with the fixed contact or pin 3.
- the plunger 18 is moved to its retracted position illustrated in FIG. 2. As the plunger moves upwardly, the spring 6 will contact the spacer 22, which will serve to limit upward movement of the spring. When the plunger attains its fully retracted position, the spring 6 will be free to make electrical contact with the pin 3.
- the annular pin flange 5 will serve to space the cylindrical washer 23 from the main body of the pin, so that the washer 23 cannot interfere with the downward movement of the plunger nose 20.
- the plunger 18, the cylindrical spacer 22 and the cylindrical washer 23 are all made of insulative material. They can, for example, comprise simple molded parts of plastic or other insulative material.
- FIG. 3 is a fragmentary view illustrating a plurality of switches similar to that shown in FIG. 1 and 2.
- the printed circuit board is illustrated at 24 and may be similar to the printed circuit board 1 of FIGS. 1 and 2.
- the board is provided with a plurality of pins 25 through 28, each identical to the pin 3 of FIGS. 1 and 2, and each having a pin flange 25a through 28a, respectively, identical to the pin flange 5 of FIGS. 1 and 2.
- the pins 25 through 28 are surrounded with cylindrical washers 29 through 32, respectively, identical to the cylindricalwasher 23 of FIGS. 1 and 2.
- Each of the pins 25-28 will be provided with a plunger and a cylindrical spacer, identical to the plunger 18 and cylindrical spacer 22 of FIGS. 1 and 2.
- a face plate similar to face plate 13 of FIGS. 1 and 2 will also be provided, having a plurality of perforations through which the plungers will extend.
- the plungers, cylindrical spacers and the face plate have not been illustrated in FIG. 3, but their respective purposes and modes of operations will be identical to that described with respect to FIGS. 1 and 2.
- FIG. 3 The purpose of FIG. 3 is to illustrate that a plurality of switch assemblies may use a common movable contact.
- the movable contact in FIG. 3 is illustrated as a coil spring 33 substantially identical to the spring contact 6 of FIGS. 1 and 2. It will be understood by one skilled in the art that the ultimate ends of the spring contact 33 will be provided with mounts which may be similar to those shown at 7 and 8 in FIGS. 1 and 2.
- the spring contact 33 is threaded about the pins 25 through 28 in a zig-zag manner, so that the spring contact 33 is biased into contact with each of the pins.
- pins 25 and 27 serve as effective mounts for that of the spring contact 33 which makes electrical contact with the pin 26.
- Pins 26 and 28 serve as effect mounts for that portion of the spring 33 which makes electrical contact with pin 27, and so on.
- the operation of the individual switch assemblies of FIG. 3 is identical to that described with respect to FIGS. 1 and 2, the only difference being that each fixed contact or pin 25 through 28 will make electrical contact with the same movable contact 33 when its respective plunger is in its retracted position.
- FIG. 4 illustrates a plunger substantially identical to that shown in FIGS. 1 and 2, and like parts have been given like index numerals.
- the pin of FIG. 4 differs from that of FIGS. 1 and 2 only in that it is provided with an annular notch 34 adjacent its nose portion 20.
- the annular notch 34 is so sized that when the plunger of FIG. 4 is in its fully depressed position (as shown in FIG.
- the spring contact will engage the annular notch 34 and more positively hold the plunger in its depressed or switch-off position.
- the nature of the interengagement of the spring contact and the annular notch 34 is such, however, as to not interfere with movement of the plunger to its retracted or switch-on position, when a pulling force is applied to the plunger.
- FIG. 5 illustrates a face plate and plunger substantially identical to that shown in FIGS. 1 and 2, and like parts have been given like index numerals.
- Instant visual identification of the state of the switch can be facilitated by providing a color band about the body of the plunger and so positioned that the color shows above the face plate 13 only when the plunger is in its retracted or switch-on position.
- a color band is shown at 35 in FIG. 5.
- the band is of such width that when the plunger is in its depressed or switch-off position (i.e., the position shown in FIG. 1) the band 25 will be wholly below the face plate 13 and will not be visable to the observer.
- FIG. 6 illustrates a plurality of switches of the present invention in a matrix arrangement.
- the Figure illustrates the forward or upper surface of a printed circuit board 36 substantially equivalent to the printed circuit board 1 of FIGS. 1 and 2.
- the lower or rearward side of the printed circuit board 36 is illustrated as having 3 printed circuit pattern elements 37 through 39 thereon, together. with 9 additional printed circuit elements 40 through 48.
- the printed circuit elements 40 through 42 are connected to the printed circuit element 37 via resistors, diodes or the like, indicated at 49 through 51.
- the printed circuit elements 43 through 45 are connected to the printed circuit element 38 via resistors 52 through 54 and the printed circuit elements 46 through 48 are connected to the printed circuit elements 39 via resistors 55 through 57.
- pins 58 through 60 make electrical contact with printed circuit elements 40 through 42, respectively.
- pins 61 through 63 make electrical contact with printed circuit elements 43 through 45, respectively, and pins 64 through 66 make electrical contact with printed circuit elements 46 through 48, respectively.
- the matrix is provided with 3 movable contact elements 67, 68 and 69.
- the movable contact element 67 is adapted to make contact with pins 58, 61 and 64, in the same zig-zag manner illustrated in FIG. 3.
- movable switch contact 68 is intended to make electrical contact with pins 59, 62 and 65
- movable contact 69 is intended to make electrical con tact with pins 60, 63 and 66.
- each of the printed circuit elements 37 through 39 are connected to their own particular circuitry, and if each of the movable contact elements 67 through 69 are connected to their own particulary circuitry, it will be evident from FIG. 6 that the circuit of movable contact 67 may be connected to any one of, or all of, the circuits of printed circuit elements 37 through 39 through the agency of the switch assemblies respresented by pins 58, 61 and 64. The same is true with respect to the circuit connected to movable switch contact 68, through the agency of switch assemblies respresented by pins 59 62 and 65. Finally, the circuit connected to the movable contact 69 may be connected to any or all of the circuits of printed circuit elements 37 through 39 through the agency of switch assemblies represented by pins 60, 63 and 66.
- FIG. 6 illustrates how well the switch assemblies of the present invention lend themselves to a matrix system and how a great many such switch assemblies may be located in a relatively small space on the printed circuit board 36.
- each of the movable contact elements will have adaquate contact pressures against their respective pins, regardless of errors in alignment of the pins.
- FIG. 7 wherein, for purposes of an exemplary illustration, a switch is shown having two movable contacts.
- a printed circuit board is shown at 70 equivalent to the printed circuit board in FIGS. 1 and 2.
- a portion of a printed circuit is indicated at 70a, similar to that portion shown at 2 in FIGS. 1 and 2.
- a pin 71 is affixed to the board 70 and has an annular flange 71a. Again, the pin 71 is equivalent to the pin 3 of FIGS. 1 and 2.
- a plunger is illustrated at 72.
- a face plate is shown at 73 having a perforation for the pin 71 and the plunger 72 at 74. Finally, a cylindrical spacer 75 and a cylindrical washer 76 are also shown. It will be understood by one skilled in the art that the plunger 72, face plate 73, cylindrical spacer 75 and cylindrical washer 76 are equivalent to the plunger 18, face plate 13, cylindrical spacer 22 and cylindrical washer 23 of FIGS. 1 and 2.
- a pair of movable contacts in the form of coil springs, are shown at 77 and 78. While the embodiment is not so limited, for purposes of an exemplary showing the contacts 77 and 78 are illustrated as being oriented generally at right angles to each other.
- the contacts 77 and 78 will be provided with any suitable form of mounts (not shown).
- the mounts may, for example, be substantially identical to those shown at 7 and 8 in FIGS. 1 and 2. It will be understood that the mounts will be so located with respect to the pins that both the upper contact 77 and lower contact 78 will be biased into contact with the pin 71 in the same manner described with respect to contact 6 of FIGS. 1 and 2.
- the mounts for the contacts 77 and 78 may be electrically connected to portions of the printed circuit, or they may comprise terminals for external wiring.
- the upper movable contact 77 and the lower movable contact 78 are separated from each other by an insulative plate 79 having a perforation 80 therethrough of sufficient diameter to permit passage of the pin 71 and the plunger 72.
- the face plate 73, the printed circuit board 68 and the separating plate 79 are maintained in parallel spaced relationship by a plurality of supports, two of which are illustrated at 81 and 82. Again the assembly may be held together by any suitable means such as screws or bolts 83 and 84.
- the plunger 72 has a tapered nose 85 and an annular flange 86 similar to the tapered noise 20 and annular flange 21 of the plunger 18 in FIGS. 1 and 2.
- the distance between the tapered nose 85 and the annular flange 86 must be sufficient to permit the tapered nose to extend downwardly beyond the lower movable contact 78.
- FIG. 7 The operation of the embodiment of FIG. 7 is substantially identical to that of the embodiment of FIGS. 1 and 2 and may be described as follows.
- the plunger 72 is illustrated in its retracted to switch-on position. This uppermost position is limited by contact of the plunger flange 86 and the rearward surface of the face plate 73.
- the plunger will retain this position by virtue of the fact that the nose portion will rest lightly on the upper switch contact 77.
- movable contacts 77 and 78 will make electrical contact with the fixed pin 71 and the switch will be on.
- the tapered nose 85 of the plunger will engage the upper movable contact 77 shoving it downwardly along the pin 71 thereby cleaning the contact areas between these two elements.
- FIG. 8 illustrates a face plate 87 equivalent to the face plate 13 of FIGS. 1 and 2 or the face plate 73 of FIG. 7.
- the face plate is provided with a pair of perforations 87a and 87b.
- a plunger 88 extends through the perforation 87a and a plunger 89 extends through the perforation 87b.
- the plungers 88 and 89 may be the equivalent of any of the plunger illustrated in FIGS. 1, 2, 4, 5, or 7.
- FIG. 8 is intended to illustrate that when the plunger or plungers are intended to be manipulated by hand, they may be provided with knobs to facilitate engagement by the operators finger.
- the plunger 88 is provided with a knob 90 and the plunger 89 is provided with a knob 91.
- the particular configuration of the knobs 90 and 91 and their manner of attachment to their respective plunger do not constitute a limitation on the present invention.
- FIGS. 9 and 10 illustrate a switch means of the present invention actuated by a typical rocker tab of an electric or gan.
- a rocker tab (of conventional configuration) is illustrated at 92 and is rockably mounted on a pivot pin 93, supported by conventional support means (not shown). The upper portion of the rock tab extends through a perforation 94 in a panel 95, again as is conventional.
- a switch plunger of the present invention is shown at 96. The plunger may be considered the equivalent of any of the plungers illustrated in FIGS. 1,
- the plunger is illustrated as having an annular groove 97 adjacent its upper end.
- rocker tab 92 One end of the rocker tab 92 is provided with an outwardly extending lug 98.
- the underside of the lug 98 is provided with a depression 99 of sufficient size as to receive the uppermost end of plunger 96.
- a resilient spring clip 100 is provided on the lug 98 and is intended to frictionally engage the lug.
- the lower surface of the spring clip 100 has a slot 101 (see FIG. 10). The slot is so sized as to permit engagement by the clip of the plunger 96 at the annular groove 97.
- the spring clip 100 operatively connects the plunger 96 to the rocker tab lug 98.
- FIGS. 11 and 12 illustrate a switch of the present invention actuable by means of a conventional tone color tab of an electric'organ.
- the tone color tab comprises a shank 103 having an enlarged portion 104 engageable by the operators fingers.
- the shank 103 extends through an opening in a panel 105 and is pivotally mounted as at 106 to a conventional lug or mount 107.
- the upper end of a switch plunger of the present invention is illustrated at 108, extending through a perforation 109 in a face plate 110.
- the face plate 110 may be considered to be the equivalent of face plates 13 or 73 in FIGS. 1, 2, 5 and 7, respectively.
- the plunger 108 may be considered to be the equivalent of any of the plungers illustrated in FIGS. 1, 2, 4, 5 and 7.
- the upper end of the plunger 108 is again provided with an annular groove 111.
- the upper end of the plunger 108 passes through a perforation 112 in the rearward end of the tone color tab shank 103. As is clearly shown both in FIGS.
- the rearward end of the shank 103 is provided with a resilient spring clip 113 of U-shaped cross section and adapted to frictionally engage the shank 103.
- the bottom portion of the U-shaped clip has a slot 113a there of a width equivalent to the diameter of the body of the plunger 108.
- the upper portion of the U-shaped clip has a slot l13b of a width equivalent to the diameter of the plunger 108 at the annular groove 111.
- the plunger 108 is illustrated in its fully depressed position. If the tone color tab is caused to rock or pivot in a clockwise direction about the pivot point 106, the plunger 108 will be moved to its retracted position. Rocking of the tone color tab about the pivot point 106 in a counterclockwise direction will return the plunger 108 to the position illustrated. The limited movement of the plunger between its depressed and retracted positions will limit the amount of rocking of the tone color tab.
- Sufiicient clearance must be provided with respect to the perforation 112 and the clip slots 1 13a and l13b to accommodate the changes in angular orientation of the shank 103 with respect to the plunger 108, brought about by the rocking of the tone color tab about the pivot point 106.
- a push-pull type electric switch assembly for single and matrix applications comprising an elongated, fixed, pin-like contact mounted on a base and a movable contact, means to mount said movable contact perpendicular to said pin, means to bias said movable contact to a closed position against said pin, an insulative plunger having a nose portion at one end, said plunger beingslidably mounted on said pin, said plunger being reciprocable' between a depressed position wherein said nose portion lies between said pin and said movable contact and a retracted position wherein said nose portion is removed from between said pin and said movable contact, and means to limit movement of said movable contact by said plunger along said pin parallel to the axis of said pin.
- the structure claimed in claim 1 including a second movable contact, said movable contacts being mounted one above the other, means to bias said second movable contact to a closed position against said pin, means to limit movement of said second movable contact by said plunger along said pin parallel to the axis of said pin, the nose of said plunger lying between said pin and both of said movable contacts when said plunger is in its depressed position, the nose of said plunger lying between said pin and both of said movable contacts when said plunger is in its retracted position, and means to prevent contact between said movable contacts.
- said base comprises a planar member having first and second parallel surfaces, said pin being mounted on said first surface normal thereto, a pair of spaced mounts said movable contact comprising an elongated, resilient contact having its ends affixed to said mounts and being in parallel spaced relationship with said first surface, said mounts being affixed to said first surface on either side of said pin, said mounts being so located with respect to said pin as to cause said biasing of said movable contact.
- said base member comprises a printed circuit board, said board having a printed circuit on said second surface, said pin extending through said base and making electrical contact with a portion of said printed circuit.
- the structure claimed in claim 5 including a face plate, means for affixing said faceplate to said base in parallelspaced relationship to said first surface, said movable contact being located between said first surface and said face plate, said face plate having a perforation therein, the end of said plunger opposite said end having said nose portion extending through said perforation in said face plate with a clearance fit, a flange on said plunger adapted to abut said face plate and determine said retracted position of said plunger.
- said means to limit movement of said movable contact along said pin parallel to said pin axis comprises a cylindrical washer surrounding said pin and positioned between said first surface of said base and said movable contact, said washer having an internal diameter sufficient to permit passage of said plunger nose portion therein, said washer having an axial length slightly less than the distance between said first surface of said base and said movable contact, and a cylindrical spacer about said pin and said plunger and positioned between said face plate and said movable contact, said cylindrical spacer having an internal diameter sufficient to permit passage of said plunger and plunger flange therethrough, said cylindrical spacer having an axial length slightly less than the distance between said face plate and said movable contact.
- the structure claimed in claim 10 including a color band about said plunger and so positioned thereon as to be visible above said face plate when said plunger is in its retracted position.
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Abstract
Description
Claims (13)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US15575271A | 1971-06-23 | 1971-06-23 |
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US3697706A true US3697706A (en) | 1972-10-10 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US155752A Expired - Lifetime US3697706A (en) | 1971-06-23 | 1971-06-23 | Push type electric switch with contact post, movable coil spring contact and interposed non conductive plunger |
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US (1) | US3697706A (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
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US3735058A (en) * | 1971-09-15 | 1973-05-22 | Addmaster Corp | Keyboard printed circuit switch assembly with axially movable coil spring contact and associated key type actuator |
US3895203A (en) * | 1973-01-24 | 1975-07-15 | Gen Electric Co Ltd | Manually operable electric switch with movable coil spring contact |
US3927284A (en) * | 1973-11-07 | 1975-12-16 | Facit Ab | Keyboard switch assembly having coil spring contacts providing point contacts engagement |
US4088855A (en) * | 1977-02-28 | 1978-05-09 | Korry Manufacturing Co. | Keyboard electro-mechanical switch with coil spring contact |
US4145589A (en) * | 1976-06-30 | 1979-03-20 | Gnt Automatic A/S | Pushbutton arrangement |
JPS5547179U (en) * | 1978-09-22 | 1980-03-27 | ||
EP0211282A1 (en) * | 1985-08-02 | 1987-02-25 | Ellenberger & Poensgen GmbH | Excess current protective circuit breaker |
US5939989A (en) * | 1998-05-12 | 1999-08-17 | Richard M. Bang | Electronic switch utilized in, for example, a drowsiness warning device |
US8404990B2 (en) | 2010-06-30 | 2013-03-26 | 3M Innovative Properties Company | Switch system having a button travel limit feature |
CN106449234A (en) * | 2016-12-23 | 2017-02-22 | 福建逢兴机电设备有限公司 | Breaker combined electric appliance |
US11051738B2 (en) * | 2013-01-24 | 2021-07-06 | Irhythm Technologies, Inc. | Physiological monitoring device |
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US11141091B2 (en) | 2010-05-12 | 2021-10-12 | Irhythm Technologies, Inc. | Device features and design elements for long-term adhesion |
US11246523B1 (en) | 2020-08-06 | 2022-02-15 | Irhythm Technologies, Inc. | Wearable device with conductive traces and insulator |
US11289197B1 (en) | 2014-10-31 | 2022-03-29 | Irhythm Technologies, Inc. | Wearable monitor |
US11350865B2 (en) | 2020-08-06 | 2022-06-07 | Irhythm Technologies, Inc. | Wearable device with bridge portion |
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US3735058A (en) * | 1971-09-15 | 1973-05-22 | Addmaster Corp | Keyboard printed circuit switch assembly with axially movable coil spring contact and associated key type actuator |
US3895203A (en) * | 1973-01-24 | 1975-07-15 | Gen Electric Co Ltd | Manually operable electric switch with movable coil spring contact |
US3927284A (en) * | 1973-11-07 | 1975-12-16 | Facit Ab | Keyboard switch assembly having coil spring contacts providing point contacts engagement |
US4145589A (en) * | 1976-06-30 | 1979-03-20 | Gnt Automatic A/S | Pushbutton arrangement |
US4088855A (en) * | 1977-02-28 | 1978-05-09 | Korry Manufacturing Co. | Keyboard electro-mechanical switch with coil spring contact |
JPS5547179U (en) * | 1978-09-22 | 1980-03-27 | ||
JPS6222986Y2 (en) * | 1978-09-22 | 1987-06-11 | ||
EP0211282A1 (en) * | 1985-08-02 | 1987-02-25 | Ellenberger & Poensgen GmbH | Excess current protective circuit breaker |
US5939989A (en) * | 1998-05-12 | 1999-08-17 | Richard M. Bang | Electronic switch utilized in, for example, a drowsiness warning device |
US11141091B2 (en) | 2010-05-12 | 2021-10-12 | Irhythm Technologies, Inc. | Device features and design elements for long-term adhesion |
US8404990B2 (en) | 2010-06-30 | 2013-03-26 | 3M Innovative Properties Company | Switch system having a button travel limit feature |
US11051738B2 (en) * | 2013-01-24 | 2021-07-06 | Irhythm Technologies, Inc. | Physiological monitoring device |
US11627902B2 (en) | 2013-01-24 | 2023-04-18 | Irhythm Technologies, Inc. | Physiological monitoring device |
US11756684B2 (en) | 2014-10-31 | 2023-09-12 | Irhythm Technologies, Inc. | Wearable monitor |
US11605458B2 (en) | 2014-10-31 | 2023-03-14 | Irhythm Technologies, Inc | Wearable monitor |
US11289197B1 (en) | 2014-10-31 | 2022-03-29 | Irhythm Technologies, Inc. | Wearable monitor |
CN106449234A (en) * | 2016-12-23 | 2017-02-22 | 福建逢兴机电设备有限公司 | Breaker combined electric appliance |
US11253186B2 (en) | 2020-02-12 | 2022-02-22 | Irhythm Technologies, Inc. | Methods and systems for processing data via an executable file on a monitor to reduce the dimensionality of the data and encrypting the data being transmitted over the wireless network |
US11497432B2 (en) | 2020-02-12 | 2022-11-15 | Irhythm Technologies, Inc. | Methods and systems for processing data via an executable file on a monitor to reduce the dimensionality of the data and encrypting the data being transmitted over the wireless |
US11925469B2 (en) | 2020-02-12 | 2024-03-12 | Irhythm Technologies, Inc. | Non-invasive cardiac monitor and methods of using recorded cardiac data to infer a physiological characteristic of a patient |
US11083371B1 (en) | 2020-02-12 | 2021-08-10 | Irhythm Technologies, Inc. | Methods and systems for processing data via an executable file on a monitor to reduce the dimensionality of the data and encrypting the data being transmitted over the wireless network |
US11246524B2 (en) | 2020-02-12 | 2022-02-15 | Irhythm Technologies, Inc. | Non-invasive cardiac monitor and methods of using recorded cardiac data to infer a physiological characteristic of a patient |
US11375941B2 (en) | 2020-02-12 | 2022-07-05 | Irhythm Technologies, Inc. | Methods and systems for processing data via an executable file on a monitor to reduce the dimensionality of the data and encrypting the data being transmitted over the wireless network |
US11382555B2 (en) | 2020-02-12 | 2022-07-12 | Irhythm Technologies, Inc. | Non-invasive cardiac monitor and methods of using recorded cardiac data to infer a physiological characteristic of a patient |
US11253185B2 (en) | 2020-02-12 | 2022-02-22 | Irhythm Technologies, Inc. | Methods and systems for processing data via an executable file on a monitor to reduce the dimensionality of the data and encrypting the data being transmitted over the wireless network |
US11504041B2 (en) | 2020-08-06 | 2022-11-22 | Irhythm Technologies, Inc. | Electrical components for physiological monitoring device |
US11399760B2 (en) | 2020-08-06 | 2022-08-02 | Irhythm Technologies, Inc. | Wearable device with conductive traces and insulator |
US11589792B1 (en) | 2020-08-06 | 2023-02-28 | Irhythm Technologies, Inc. | Wearable device with bridge portion |
US11246523B1 (en) | 2020-08-06 | 2022-02-15 | Irhythm Technologies, Inc. | Wearable device with conductive traces and insulator |
US11350864B2 (en) | 2020-08-06 | 2022-06-07 | Irhythm Technologies, Inc. | Adhesive physiological monitoring device |
US11751789B2 (en) | 2020-08-06 | 2023-09-12 | Irhythm Technologies, Inc. | Wearable device with conductive traces and insulator |
US11350865B2 (en) | 2020-08-06 | 2022-06-07 | Irhythm Technologies, Inc. | Wearable device with bridge portion |
US11806150B2 (en) | 2020-08-06 | 2023-11-07 | Irhythm Technologies, Inc. | Wearable device with bridge portion |
US11337632B2 (en) | 2020-08-06 | 2022-05-24 | Irhythm Technologies, Inc. | Electrical components for physiological monitoring device |
US11998342B2 (en) | 2022-11-10 | 2024-06-04 | Irhythm Technologies, Inc. | Methods and systems for processing data via an executable file on a monitor to reduce the dimensionality of the data and encrypting the data being transmitted over the wireless network |
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