GB2229577A - Mounting contact elements on printed circuit boards - Google Patents

Mounting contact elements on printed circuit boards Download PDF

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Publication number
GB2229577A
GB2229577A GB8906757A GB8906757A GB2229577A GB 2229577 A GB2229577 A GB 2229577A GB 8906757 A GB8906757 A GB 8906757A GB 8906757 A GB8906757 A GB 8906757A GB 2229577 A GB2229577 A GB 2229577A
Authority
GB
United Kingdom
Prior art keywords
printed circuit
circuit board
plate
contact element
mounting means
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.)
Withdrawn
Application number
GB8906757A
Other versions
GB8906757D0 (en
Inventor
Chi Moon Chui
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.)
Well Treasure Ind Ltd
Original Assignee
Well Treasure Ind 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 Well Treasure Ind Ltd filed Critical Well Treasure Ind Ltd
Priority to GB8906757A priority Critical patent/GB2229577A/en
Publication of GB8906757D0 publication Critical patent/GB8906757D0/en
Publication of GB2229577A publication Critical patent/GB2229577A/en
Withdrawn legal-status Critical Current

Links

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
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/7006—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard comprising a separate movable contact element for each switch site, all other elements being integrated in layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2205/00—Movable contacts
    • H01H2205/016—Separate bridge contact
    • H01H2205/024—Means to facilitate positioning
    • H01H2205/03—Apertured plate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/034—Positioning of layers

Landscapes

  • Mounting Of Printed Circuit Boards And The Like (AREA)

Abstract

A contact element 1 is held in position on a printed circuit board 2 by means of a cover plate 4. The cover plate 4 has recesses (7) (Fig. 2) to accommodate the contact elements 1, which recesses terminate in apertures 8 through which the contact elements may be actuated. Cover plate 4 may be secured by projections 9 which are accommodated in apertures 10 in the p.c.b.. <IMAGE>

Description

MOUNTING CONTACT ELEMENTS ON PRINTED CIRCUIT BOARDS Field of the Invention This invention relates to the mounting of contact elements on printed circuit boards.
Background to the Invention It is commonly necessary to mount one or more contact elements on a printed circuit board, such contact elements being used, for example, in switches, operating buttons and the like. It is known to use an adhesive tape to secure the contact element in position on the board but this does not always result in a sufficiently accurate or stable mounting for the contact element.
Summary of the Invention The present invention now provides a printed circuit board having a contact element held in position thereon by a mounting means, wherein sald mountIng means comprises a plate which overlays at least part of the contact element and means whereby the sald plate may be secured to the printed cIrcuIt board.
In a further aspect, this InventIon also provIdes a method of mounting a contact element on a printed circuit board, which method comprises placIng the contact element in position on the board, overplaying at least part of the contact element with a plate and securing said plate to the printed circuit board.
In yet another aspect, this invention provIdes mounting means suItable for use with said printed circuit board or in said method, which mounting means comprises a plate adapted to overlay at least part of a contact element and means whereby said plate may be secured to a printed circuit board.
Brief Description of the Drawings Figure 1 is a top view of part of a printed circuit board on which two contact elements are mounted by means of a strip of adhesive tape, Figure 2 15 a view of the underside of an exemplary mounting means according to this inventions Figure 2A shows a section through the mounting means of Figure 2 along the line A-A, and Figure 3 is a perspective view showing the manner in which contact elements may be mounted on a printed circuit board using the mounting means shown in Figures 2 and 2A.
In the Figures, like parts are denoted by like numerals.
Description of Preferred Embodiments Before turning to the illustrated embodiment of the present invention, it may be helpful first to describe the prior-art embodiment shown in Figure 1. In that embodiment, two contact elements in the form of contact plates 1 are mounted side by side on a printed circuit board 2 (only part of which is shown in Figure 1). The contact plates 1 are overlaId by a strip of adhesive tape 3 and the area of the tape surrounding the contact elements is pressed firmly into adhesive engagement with the surface of the printed circuit board, thereby holding the contact element In place. However, as IndIcated above, It is not always easy to ensure reproducable and precise placement of the contact elements and the elements may not always be held as firmly in place as is desirable.
Turning now to the illustrated embodiment of the present Invention, a mounting means is provided in the form of a cover plate 4 having a generally planar top surface 5 and a bottom surface 6 parallel therewith.
The cover plate 4 may be made of any suitable material, for example a plastics material.
Cover plate 4 is generally of an elongate octagonal shape and two recesses 7 are provided in the bottom surface 6, said recesses being side by side along the length of the cover plate.
The recesses 7 are so shaped as to conform to the shape of the contact plates 1. Each recess terminates in an aperture 8 In the top surface 5.
The means for securing the plate to the printed circuit board is preferably adapted for frictional engagement with corresponding means in or on the printed circuit board. In the illustrated embodiment, the cover plate 4 is provided with two pegs 9 which project perpendicularly from the bottom surface 6, the pegs being arranged on the mid-section of the cover plate and being disposed side by side along the width of the latter. The size and spacing of the pegs 9 are such that the pegs may be accommodated within apertures 10 in the upper surface 11 of the printed circuit board 2. Preferably, the pegs should fit firmly in their respective apertures.
To mount the contact plates 1 on the printed circuit board 2 in accordance with the present invention, the said plates 1 are placed in position on the upper surface of the board and the cover plate IS placed on top of them and the pegs pushed firmly home Into the apertures 10. The contact plates 1 are accommodated within their respective recesses 7 in the cover plate 4 and are thereby accurately sIted on the printed circuit board 2. Since the contact plates are generally non-circular and since the shape of the recesses conforms therewIth, rotational, lateral and vertlcal displacement of the contact plates on the surface of the printed board can be substantially prevented (depending upon how closely the contact plates 1 fit into the respective recesses).
In the finished assembly, it is preferred that the lower surface 6 of the cover plate 4 should engage the upper surface 11 of the printed circuit board.
The apertures in the top surface 5 of the cover plate 4 provide access to, and hence permit actuation of, the contact plates 1.
The dimensions of the cover plate 4 can be readily selected by those skilled in the art in order to accommodate contact elements of any gIven sIze. Moreover, although the illustrated embodiment is capable of mounting two contact plates, the mounting means of this invention may be readily adapted to provide for the mounting of just one contact element or of three or more such elements.
The use of just one peg or projection, although possible, is not favoured since it could permit pivotal displacement of the cover plate; however, there is no reason in principle why the number of pegs should not be increased to three or more and this may even be desirable to provide added secureness when a plurality of contact elements are to be mounted by means of a single cover plate.
It will of course be understood that the present invention has been described above purely by way of example, and modifications of detail can be made within the scope of the invention.

Claims (11)

Claims
1. A printed circuit board having a contact element held in position thereon by a mounting means, wherein said mounting means comprises a plate which overlays at least part of the contact element and means whereby the plate may be secured to the printed board.
2. A printed circuit board accordIng to claim 1, wherein the plate is provided with a recess adapted to accommodate the contact element.
3. A printed circuit board according to claim 1 or 2, wherein the plate is provided with an aperture through which the contact element may be actuated.
4. A printed circuit board according to claim 1, 2 or 3, wherein the mounting means IS provIded with means whereby the plate may be releasably secured to the printed circuit board.
5. A printed circuit board according to any of claims 1 to 4, wherein the means for securing the plate to the printed circuit board is adapted for frictional engagement with corresponding means in or on the printed circuit board.
6. A printed circuit board according to any of claims 1 to 5, wherein the means for securing the plate to the printed circuit board comprises at least one projection adapted to be receIved within an aperture in the printed circuit board.
7. A printed circuit board according to any of claims 1 to 6, wherein the plate is adapted to hold two or more contact elements in position with respect to the board.
8. A printed circuit board according to claim 1 wherein the mounting means is substantially as hereinbefore described and/or as illustrated in Figures 2, 2A and 3 of the accompanying drawings.
9. A method of mounting a contact element on a printed circuit board, which method comprises placing the contact element in position on the printed circuit board, overlaying at least part of the contact element with a plate and securing the plate to the printed circuit board.
10. A method according to claim 9, wherein the said plate is part of a mounting means as defined in any of claims 2 to 8.
11. Mounting means for holding a contact element in position on a printed circuit board, being mounting means as defined in any of claims 1 to 8.
GB8906757A 1989-03-23 1989-03-23 Mounting contact elements on printed circuit boards Withdrawn GB2229577A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8906757A GB2229577A (en) 1989-03-23 1989-03-23 Mounting contact elements on printed circuit boards

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8906757A GB2229577A (en) 1989-03-23 1989-03-23 Mounting contact elements on printed circuit boards

Publications (2)

Publication Number Publication Date
GB8906757D0 GB8906757D0 (en) 1989-05-10
GB2229577A true GB2229577A (en) 1990-09-26

Family

ID=10653922

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8906757A Withdrawn GB2229577A (en) 1989-03-23 1989-03-23 Mounting contact elements on printed circuit boards

Country Status (1)

Country Link
GB (1) GB2229577A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0572993A1 (en) * 1992-06-05 1993-12-08 ABBPATENT GmbH Electrical switch
EP0583715A1 (en) * 1992-08-14 1994-02-23 ABBPATENT GmbH Electrical switch
WO2010037757A1 (en) * 2008-09-30 2010-04-08 Huf Hülsbeck & Fürst Gmbh & Co. Kg Actuation unit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643041A (en) * 1970-12-30 1972-02-15 Unidynamics Phoenix Pushbutton diaphragm switch with improved dimple actuator and/or capacitance-type switch contact structure
GB1430399A (en) * 1973-01-02 1976-03-31 Bowmar Instrument Corp Keyboard switch assembly
GB1537686A (en) * 1975-04-16 1979-01-04 Northern Telecom Ltd Multi-contact push-button switch
GB2046996A (en) * 1979-04-11 1980-11-19 Electronic Components Ltd Electrical switch
GB2088131A (en) * 1980-11-21 1982-06-03 Keyboard The Co Keyboard switch actuators
US4771139A (en) * 1986-06-27 1988-09-13 Desmet Gregory L Keyboard with metal cover and improved switches

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643041A (en) * 1970-12-30 1972-02-15 Unidynamics Phoenix Pushbutton diaphragm switch with improved dimple actuator and/or capacitance-type switch contact structure
GB1430399A (en) * 1973-01-02 1976-03-31 Bowmar Instrument Corp Keyboard switch assembly
GB1537686A (en) * 1975-04-16 1979-01-04 Northern Telecom Ltd Multi-contact push-button switch
GB2046996A (en) * 1979-04-11 1980-11-19 Electronic Components Ltd Electrical switch
GB2088131A (en) * 1980-11-21 1982-06-03 Keyboard The Co Keyboard switch actuators
US4771139A (en) * 1986-06-27 1988-09-13 Desmet Gregory L Keyboard with metal cover and improved switches

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0572993A1 (en) * 1992-06-05 1993-12-08 ABBPATENT GmbH Electrical switch
EP0583715A1 (en) * 1992-08-14 1994-02-23 ABBPATENT GmbH Electrical switch
WO2010037757A1 (en) * 2008-09-30 2010-04-08 Huf Hülsbeck & Fürst Gmbh & Co. Kg Actuation unit
US8809710B2 (en) 2008-09-30 2014-08-19 Huf Hülsbeck & Fürst Gmbh & Co. Kg Actuation unit
EP2800117A1 (en) * 2008-09-30 2014-11-05 Huf Hülsbeck & Fürst GmbH & Co. KG Actuating unit
CN104485242A (en) * 2008-09-30 2015-04-01 霍弗·霍斯贝克及弗斯特两合公司 Actuation unit
CN104485242B (en) * 2008-09-30 2017-07-04 霍弗·霍斯贝克及弗斯特两合公司 Actuating unit
DE102009033486B4 (en) 2008-09-30 2018-12-27 Huf Hülsbeck & Fürst Gmbh & Co. Kg operating unit

Also Published As

Publication number Publication date
GB8906757D0 (en) 1989-05-10

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)