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Publication numberUS3773998 A
Publication typeGrant
Publication dateNov 20, 1973
Filing dateOct 16, 1972
Priority dateOct 16, 1972
Publication numberUS 3773998 A, US 3773998A, US-A-3773998, US3773998 A, US3773998A
InventorsCoulter J, Seeger R
Original AssigneeChomerics Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pedestal and spring member for key actuator of diaphragm switch
US 3773998 A
Abstract
A keyboard actuator which includes a first member adapted to be supported over a circuit board having a conductive pattern thereon and supporting a resilient conductive layer by way of an insulator layer having a window therethrough in line with at least a portion of the conductive pattern, a second member snapable into the first member and slidable while held therein, first and second resilient biasing means, the first biasing means separating the members and the second biasing means extending between the second member and the conductive layer.
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Description  (OCR text may contain errors)

United States Patent 1 Seeger, Jr. et al.

[ Nov. 20, 1973 PEDESTAL AND SPRING MEMBER FOR KEY ACTUATOR OF DIAPHRAGM SWHTCH [75] Inventors: Richard E. Seeger, Jun, Topsfield;

John G. Coulter, Reading, both of Mass.

[73] Assignee: Chomerics, Inc., Wobum, Mass.

[22] Filed: Oct. 16, 1972 [21] Appl. No.: 297,636

[52] U.S.'Cl. 200/159 B, 200/153 V, 200/172 A [51] Int. Cl. 1101111 13/06, 110111 13/52 [58] Field of Search 200/159 B, 159 R,

200/159 A, 153 V, 172 R, 172 A [56] References Cited UNITED STATES PATENTS 3,165,611 1/1965 Hagberg 200/153 V UX 3,663,780 5/1972 Golbeck 200/159 R X 3,521,015 7/1970 Wooldridge et a1. 200/159 R 3,185,803 5/1965 Driscoll 200/159 A 3,676,615 7/1972 Wiedmer.... 200/159 B X 3,707,609 12/1972 Dapot 200/159 B X Primary ExaminerDavid Smith, Jr. Assistant ExaminerRobert A. Vanderhye Attorney-Sewall P. Bomstein et a1.

[5 7 ABSTRACT A keyboard actuator which includes a first member adapted to be supported over a circuit board having a conductive pattern thereon and supporting a resilient conductive layer by way of an insulator layer having a window therethrough in line with at least a portion of the conductive pattern, a second member snapable into the first member and slidable while held therein,

first and second resilient biasing means, the first biasing means separating the members and the second biasing means extending between the second member and the conductive layer.

7 Claims, 5 Drawing Figures PEDESTAL AND SPRING MEMBER FOR-KEY ACTUATOR OF DIAPHRAGM SWITCH STATEMENT OF THE DISCLOSURE This invention is directed to a new and improved keyboard actuator particularly adapted for use with a keyboard of the type utilizing a resilient conductive layer to make electrical contact with an electrical conductive contact.

In particular, the present invention is directed to a new and improved keyboard construction in which two parts, one movable and the other fixed in place are snaped together and two resilient biasing means are provided one of which is used to bias the movable part away fromthe fixed in place part and the other resilient biasing means is positioned between the movable part and the conductive layer in order to apply a force thereto to cause the conductive layer to contactthe contact when a force is applied to the movable part.

The present invention is usable in place of theswitch actuating means disclosed in copending US. Pat. applications Ser. No. 145,212 filed May 20, 1971 by Richard E. Seeger, Jr. and George T. Hodgson, Jr. and Ser. No. 154,752 filed June 12, 1971 by Richard E. Seeger, Jr. and William J. Lynn. The entire disclosure of these patent applications are incorporated herein by reference hereto.

The present invention permits a keyboard to be constructed with a minimum of parts, with a reduction in fabrication and assembly costs. The major parts (those not resilient in nature) used herein may be constructed of plastic moldable in a conventional manner thus providing significant cost savings.

BRIEF DESCRIPTION OF THE DISCLOSURE The keyboard actuator of the disclosure includes a fixed in place member for mounting on a circuit board over a resilient conductive layer, the fixed in place member having means for retaining a movable member snapable therein and adapted for slidable movement therein and first and second resilient biasing or spring means, the first spring means separating the members and the other positioned to be forced against the conductive layer upon movement of the movable member towards the conductive layer.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view with the parts removed of a keyboard utilizing the actuator of the invention;

FIG. 2 is a sectional view taken along line 2-2 in FIG. 1 illustrating the key in position when at rest;

FIG. 3 is a sectional view similar to FIG. 2 illustrating the actuator when a force is applied thereto;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 2; and

FIG. 5 is a sectional view taken along line 55 in FIG. 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Reference should now be had to FIGS. l-5 for a description of the preferred embodiment of the disclosure. At 6 there is shown a keyboard which comprises an outer decorative frame 7 in which there is mounted the working parts of the invention. The frame may be mounted to the working parts as shown in the aforementioned U.S. Pat. application Ser. No. 145,122 or any other conventional manner. The operating parts of the invention include an insulator board 8 (e.g., Bakelite, Formica) of the conventional type used in printed circuit applications and having holes 8a formed therethrough.

having a window 10a extending therethrough in line with at least a portion of the electrical contact means and mounting holes 10b. Positioned on the layer 10 is a resilient conductive layer or sheet 11 having mounting holes 11a. The layer 11 is selected of a material which may be forced through the window 10a into contact with the contact means 9 (see FIG. 3) and then springs back to itsat rest position shown in FIG. 2 when a force applied thereto is removed.

Various materials may be used as the conductive layer as set forth in the aforementioned referred to applications with the preferred material being a conductive plastic formed of silicone rubber (rubber is defined as a plastic in the context used herein) filled with silver flakes e.g., between 10 to 80 percent by volume.

At 12 in the drawing there is shown the actuator of the invention which includes a fixed in place or base member 13 having a hollow cavity 130 with a lip l3aa formed along the top thereof. The cavity 13a is provided with two guide channels or slots 13b within the sidewall thereof and has a pedestal 13c extending upwardly therefrom. The pedestal is provided with a bore 13d as shown.

A movable or key member is shown at 14 on which indicia e.g., numbers or letters may be mounted thereon as shown in FIG. 1.

The movable member 14 is positioned for slidable up and down movement with respect to the member 13 and has a portion thereof positioned within the confines of the cavity 13a. The member 14 is provided with projections 14a which are positionable in the slots 13b for travel therein.

The projections 14a as well as the member 14 forming a part thereof are preferably formed of a plastic material which is sufficiently flexible and resilient e.g.,

polypropylene, polyethelene, etc., so that it may snap past the lip 13aa into the cavity 13a and the slots 13b. Alternatively the base member or both members may be selected of a resilient type of material to allow the members to snap'together.

The member 14 is also provided with first and second bores 14b and 14c. The bore 14c is constructed so that it is positionable over the pedestal 13c and is slidably shown at 16 and performs the function of urging the conductive layer 11 against the contact means 9 upon application of a force to member 14 (see FIG. 3). Each of the springs may be coil springs as shown.

The spring 16 is selected such that when it is in the position shown in FIG. 2 it applies little or no force to the layer 11 and when it is forced downwardly by the member 14 it remains virtually uncompressed (see FIG. 3) and distorts the layer 11 so that it engages the contact means 9. The spring 16 is also preferably selected such that when the layer 11 bottoms against the contact means 9, it then slightly compresses so as not to substantially injure the layer 14 surface by penetrating into it. A protective cover layer e.g., of plastic may be positioned between the spring 16 and the layer 11 to provide further protection.

The actuator 12 is preferably mounted to the board 8 by the provision of rods l3e extending from the member 13. The rods extend through the holes 8a, 10b, and 11a to join them together in a sandwich.

The rods are preferably constructed of a plastic material e.g., polypropylene, nylon which may be softened with heat to form the heads 13f. Alternatively the rods may be threaded and nuts may then be used to hold the sandwich together.

As shown in the aforementioned patent application or disclosed in the aforementioned patent applications, the contact means may be segmented and thus the layer 1 1 may be used to close a circuit between the segments or alternatively the layer 11 may be grounded and the contact means made high so as to complete a circuit. Connector pins as shown in the aforementioned patent applications may be used to make contact with the layer 11 and the contact means 9. 1

We claim 1. In a keyboard or the like which includes an insulator board having electrical contact means thereon, insulator means having a window therethrough in alignment with at least a portion of the contact means and a resilient electrically conductive sheet means positioned on the insulator layer which has the property of being deformable by a force applied thereto to make electrical contact with the contact means by extending through the insulator means window and then springing back to a position out of electrical contact with the contact means, the improvement comprising a base member positioned over the conductive layer and having a portion of a movable member slidably positioned therein, first resilient biasing means'positioned between the base member and the movable member to urge the movable member and the base member apart, a lip forming a part of the base member to maintain at least a portion of the movable member within the confines of the base member by entrapping projections attached to the movable member, a second resilient biasing means positioned in contact with the movable member and positioned to apply a force to the conductive sheet means to deform it in order to make electrical contact with the contact means, said basemember having guide slots along the inner wall thereof in which the projections are slidably movable, in which the base member includes a pedestal and in which the movable member includes a first bore, the first bore of the movable member positioned about at least a portion of the pedestal.

2. Ina keyboard as claimed in claim 1 in which the pedestal has a bore in which the second resilient biasing is positioned, said second resilient biasing means ex tending into the bore beyond the pedestal to engage the movable member.

3. In a keyboard as claimed in claim 2 in which the spring is of the type which will compress once bottoming the conductive layer against the contact means.

4. In a keyboard according to claim 3 in which the first resilient biasing means surrounds the pedestal.

5. In a keyboard according to claim 4 in which the second resilient biasing means rests directly on the conductive layer.

6. In a keyboard according to claim 5 in which the resilient biasing means are coil springs.

7. In a keyboard according to claim 6 in which the base member includes rods which extend through holes in the board, the conductive layer and the insulator layer to form a sandwich.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3165611 *Jul 18, 1961Jan 12, 1965Carling Electric IncSpring biased-spring actuated momentary switch
US3185803 *Sep 11, 1964May 25, 1965Driscoll Neil JPush button switch with flexible contact
US3521015 *May 13, 1968Jul 21, 1970Singer CoKey switch with axially misaligned shuttle bridging member
US3663780 *Jun 8, 1970May 16, 1972Oak Electro Nectics CorpSwitch in a button
US3676615 *Jul 13, 1970Jul 11, 1972IbmPushbutton keyboard switch array and associated printed circuit logic cards
US3707609 *Oct 27, 1971Dec 26, 1972Texas Instruments IncDiaphragm pushbutton switch array for keyboards
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3862381 *Oct 29, 1973Jan 21, 1975Chomerics IncKeyboard switch assembly with multilayer, coextensive contactor means
US3862382 *Oct 29, 1973Jan 21, 1975Chomerics IncKeyboards switch assembly with multilayer pattern contact means
US3911233 *Aug 20, 1973Oct 7, 1975Matsushita Electric Ind Co LtdKeyboard switch for desk top electronic calculators
US3961147 *Apr 10, 1974Jun 1, 1976Teletype CorporationKeying contact assembly
US4027129 *Sep 30, 1974May 31, 1977Giko Kabushiki KaishaPush button switch
US4117292 *Jun 10, 1977Sep 26, 1978Telaris Telecommunications, Inc.Dual spring actuator for keyboard switch assembly
US4129758 *Jun 10, 1977Dec 12, 1978Telaris Telecommunications, Inc.Keyboard switch assembly having flexible contact carrying member between contact carrying substrate and flexible, resilient, key-depressible bubble protrusions
US4156802 *Oct 25, 1977May 29, 1979Telaris Telecommunications, Inc.Electrical switch assembly
US4249055 *May 23, 1979Feb 3, 1981Alps Electric Co., Ltd.Push button switch
US4251703 *Oct 25, 1979Feb 17, 1981International Standard Electric CorporationPushbutton for use with pushbutton switches
US4334134 *Nov 13, 1980Jun 8, 1982Gte Automatic Electric Labs Inc.Identification cap actuator assembly
US4350857 *Oct 3, 1980Sep 21, 1982Allen-Bradley CompanyIlluminated industrial membrane switch
US4376239 *Apr 30, 1982Mar 8, 1983Allen-Bradley CompanyIndustrial membrane switch
US4440999 *Aug 13, 1982Apr 3, 1984Press On, Inc.Membrane switch
US4471177 *Aug 13, 1982Sep 11, 1984Press On, Inc.Enlarged switch area membrane switch and method
US4602138 *May 3, 1985Jul 22, 1986Ing. C. Olivetti & C., S.P.A.Keyboard with removable modular keys
US5895901 *Sep 11, 1997Apr 20, 1999Matsushita Electric Industrial Co., Ltd.Long-stroke push-on switch with reduced height
US7442894 *Mar 5, 2008Oct 28, 2008Coactive Technologies, Inc.Electrical switch having a variable return force
DE2651376A1 *Nov 11, 1976May 26, 1977Electronic Components LtdDrucktastenanordnung fuer einen elektrischen schalter
DE3013115A1 *Apr 3, 1980Oct 8, 1981Schoeller & Co ElektrotechElektrischer tastenschalter
DE3148299A1 *Dec 5, 1981Jul 21, 1983Krone GmbhTastenschalter fuer fernmeldegeraete, insbesondere fernsprechapparate
EP0572860A1 *May 18, 1993Dec 8, 1993VDO Adolf Schindling AGBarshaped button
Classifications
U.S. Classification200/517, 200/330
International ClassificationH01H13/14, H01H13/705, H01H13/70
Cooperative ClassificationH01H2233/056, H01H2235/004, H01H13/705, H01H2209/078, H01H13/14, H01H2229/034, H01H2233/024
European ClassificationH01H13/705, H01H13/14
Legal Events
DateCodeEventDescription
Feb 8, 1990ASAssignment
Owner name: AMP KEYBOARD TECHNOLOGIES, INC., A WHOLLY OWNED SU
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMP INCORPORATED;REEL/FRAME:005258/0518
Effective date: 19890418
Owner name: LUCAS DURALITH AKT CORPORATION
Free format text: CHANGE OF NAME;ASSIGNOR:AMP KEYBOARD TECHNOLOGIES INC.;REEL/FRAME:005258/0527
Effective date: 19890428
Feb 8, 1990AS01Change of name
Owner name: AMP KEYBOARD TECHNOLOGIES INC.
Effective date: 19890428
Owner name: LUCAS DURALITH AKT CORPORATION
May 21, 1981ASAssignment
Owner name: AMP INCORPORATED, HARRISBURG, PA., 17105, A CORP.
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CHOMERICS, INC.;REEL/FRAME:003854/0523
Effective date: 19810511