FR2620563A1 - Novel type of contactor for a small-pitch keyboard of the alphanumeric type - Google Patents

Novel type of contactor for a small-pitch keyboard of the alphanumeric type Download PDF

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Publication number
FR2620563A1
FR2620563A1 FR8712914A FR8712914A FR2620563A1 FR 2620563 A1 FR2620563 A1 FR 2620563A1 FR 8712914 A FR8712914 A FR 8712914A FR 8712914 A FR8712914 A FR 8712914A FR 2620563 A1 FR2620563 A1 FR 2620563A1
Authority
FR
France
Prior art keywords
contactor
housing
piston
rib
cabochon
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.)
Granted
Application number
FR8712914A
Other languages
French (fr)
Other versions
FR2620563B1 (en
Inventor
Alain Reynal
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.)
ALPHAMERIC SA
Original Assignee
ALPHAMERIC SA
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 ALPHAMERIC SA filed Critical ALPHAMERIC SA
Priority to FR8712914A priority Critical patent/FR2620563B1/en
Publication of FR2620563A1 publication Critical patent/FR2620563A1/en
Application granted granted Critical
Publication of FR2620563B1 publication Critical patent/FR2620563B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70Switches 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
    • H01H13/702Switches 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 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/705Switches 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 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2217/00Facilitation of operation; Human engineering
    • H01H2217/012Two keys simultaneous considerations
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00Dimensions; Characteristics
    • H01H2227/032Operating force
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2233/00Key modules
    • H01H2233/05Actuator part on body
    • H01H2233/054Snap coupling
    • H01H2233/056Snap coupling with limited freedom
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2233/00Key modules
    • H01H2233/07Cap or button on actuator part
    • H01H2233/086Inserting

Abstract

The subject of the present invention is a novel type of contactor for a small-pitch keyboard of the alphanumeric type. The contactor is notable in particular in that the cap 9 comprises four inclined lateral faces, one convex upper face 10 off-centred towards the rear so as to reduce the risks of simultaneously pressing plural contactors. Furthermore, the cap is provided with two lugs 11 projecting downwards and which engage forcibly into the housing 12 of the plunger 8 on either side of a diametral rib 13 for reinforcing the plunger. The electro-conducting element 4 of the contactor is carried by a deformable membrane 3 designed so that the curve representing the relationship between the force applied to the cap and the distance travelled by the cap has a slope which is positive, then zero, then negative until contact is established. <IMAGE>

Description

The present invention relates to a new type of contactor for low pitch keyboard of the alpha-numeric type.

By keyboard step, we mean the interval between two consecutive contactors.

The use of contactors for low-pitch keyboards intended for intensive use presupposes that the problems of simultaneous support on several contactors, mechanical resistance and comfort of use are resolved, resulting directly from the reduction of the dimensions of said contactors. .

The object of the present invention is to solve the abovementioned problems by implementing a new type of contactor provided with arrangements to reduce the risk of simultaneous support.

The present invention also relates to a contactor, each of its members having good mechanical strength and in particular the movable members.

In addition, the present invention relates to a contactor having good comfort of use.

To this end, the contactor according to the invention for low pitch keyboard subjected to intensive use comprising a body provided with a housing in which is arranged an elastic bell-shaped membrane provided with an electrically conductive element brought into contact with a second electrically conductive element of a printed circuit, by deformation of the membrane under the effect of the depression in a bore of the body, of a piston provided with a cap having four lateral faces and an upper face of finger support is essentially characterized in that the four lateral faces of the cabochon are inclined so as to form each with the upper support face an obtuse dihedral and that said upper face is off-center towards the rear, so that that said bearing face can be released as much as possible from the neighboring cabochons, ie from the cabochon of each contactor situated in front and from the cabochon of the contactors situated laterally, which reduces the risks of simultaneous support on several cabochons.

According to another characteristic, the upper face of the cabochon is convex.

According to another characteristic, the cabochon is provided with two parallel legs projecting downward, of the same length, providing between them an interval, both of which lock in a recess of the piston, respectively on either side of a diametrical rib of this housing.

The underside of the cap is brought into abutment against the piston, which allows the cap to be completely immobilized relative to the piston.

The rib of the housing made in the piston and the lugs of the cabochon coming to block in the housing, increase the resistance of the piston.

Other advantages and characteristics of the invention will appear on reading the description of a preferred embodiment given by way of non-limiting example with reference to the accompanying drawings in which - Figure 1 is a view in longitudinal section of the contactor according to the invention, this being shown in the closed position, - Figure 2 is a view in longitudinal section of the cap, - Figure 3 is a view in longitudinal section of the piston, - Figure 4 is a cross-sectional view of the piston according to the invention, - Figure 5 is an external view of the contactor according to the invention, - Figure 6 shows the curve representing the relationship between the force applied by the cap on the finger and the distance traveled by the cabochon.

As shown, the contactor according to the invention for low-pitch alpha-numeric keyboard subjected to intensive use comprises a key body 1 by which it is mounted and locked by elastic tabs of the key body in an opening of the chassis of the keyboard.

Contactors 1 are organized in several rows.

The key body is provided with a housing 2 in which is arranged an elastic membrane 3, in the shape of a bell provided with an electrically conductive element 4 brought into contact simultaneously with two studs 5 of a printed circuit 6, by deformation of the membrane 3 under the effect of the depression in the housing 2 of a piston 8 guided in a bore 7 of the body 1 and provided with a cap 9 having four lateral faces and an upper face 10 for supporting the finger.

According to the invention, the four lateral faces are inclined so as to form with the upper face an obtuse dihedral and the upper face is offset backwards, which makes it possible to separate the bearing face as much as possible from the contactors neighbors, i.e. two side switches in the same row, and the switch in the front row.

The purpose of this arrangement is to reduce the risk of simultaneous support on two cabochons.

Preferably, the re-entrant angle formed by the front side face of the cap with the upper face is of greater value than that of the re-entering angle formed by the rear side face and by the upper face.

In another way, the front face compared to the other side faces is more straightened.

The front and upper sides can receive inscriptions.

Preferably, the front face is convex in shape in order to improve the finger attack.

This arrangement, by moving the finger support area upwards, also contributes to reducing the risks of simultaneous support on two cabochons.

According to the preferred embodiment, the upper face is curved along a relatively large radius arc, which allows the use of pencils and other similar objects for actuation of the contactor without risk of slipping on the upper face. .

Preferably, the axis of revolution of the face 10 intersects the front and rear side faces.

According to the invention, the cabochon is provided with two parallel legs 11 projecting downward, both rooted on its underside, of equal lengths, spaced from one another by which the cabochon is fixed to the piston 8 .

These tabs are inserted in forcing into an axial housing 12 of the piston respectively on either side of a vertical median rib 13 of said housing partitioning the latter.

According to the preferred embodiment, the tabs 11 each have a cross section of rectangular shape.

These tabs 11 are oriented relative to one another so that the large face of one is arranged opposite and is parallel to one of the large faces of the other.

These two faces, facing each other, will be referred to below as internal faces.

The gap between the two internal faces is intended to be filled by the rib 13 of the housing 12 of the piston.

According to the preferred embodiment, the housing 12 is of cylindrical shape. The rib 13 of this housing extends along a diametrical plane of the housing, from the bottom of the latter along substantially 2/3 of its height.

The cross section of this rib substantially follows the outline of a rectangle.

This rib is rooted to the wall of the housing by its two faces corresponding to the short sides of its cross section.

Preferably, the two faces of the rib corresponding to the two long sides of the cross section are each provided with at least one bead 14 extending along their entire height.

On either side of the rib 13, on the wall of the housing are rooted two beads 15 extending along the entire height of said housing the tabs 11 of the cap each being sandwiched between the bead 14 and the two beads 15. These two beads 15 each have a flat face 15A parallel to the large corresponding face of the rib 13 extending along their entire height.

Each tab 11, being inserted into the housing as defined above, is clamped between the bead 14 of the rib 13 and the flat faces 15A of the beads 15.

In addition, each housing 11 on either side of the rib is also equipped with two other beads 16, in the interval of which the tab 11 is introduced.

These beads are both rooted to the wall of the housing and each have a flat vertical face 16A perpendicular to the large face of the rib. The two flat faces 16A are turned towards one another and are spaced from each other by a value very little greater than the width of the tabs 11.

Each flat face 16A aims to oppose the tilting in one direction or the other of the tab 11 in the housing 12, which strengthens the connection between the cap and the piston 8. Preferably, the underside of the cabochon is brought into contact with the piston, which further increases the stability of one relative to the other.

The tabs 11 coming to be housed in forcing in the housing 12 of the piston contribute to improving the mechanical resistance of the latter.

The generally cylindrical piston is guided in translation in the bore of the key body. To this end, the piston following at least one of its generatrices comprises an external stud 17 which cooperates in sliding with a groove 18 of corresponding shape hollowed out in the wall of the bore 7 of the key body 1.

This bore opens into the housing 2.

According to the preferred embodiment, the piston and the bore 3 of the key body are provided with four studs and four grooves respectively.

The studs and the grooves are offset from each other by 900.

The pins, while essentially having a guiding function, contribute to increasing the mechanical resistance of the piston.

The piston in the lower part is provided with a collar 19 by means of which it is pressed against the membrane in the housing 2 of the key body 1.

This flange, projecting on its periphery comprises two lugs 20 which slide in engagement, each in a vertical groove 21 formed in the wall of the housing 2 of the body 1.

These lugs allow the correct angular positioning of the piston with respect to the key body 1 during assembly.

In addition, these pins coming into abutment against the lower end of their groove limit the movement of driving the piston into the housing 2 of the body 1.

The upward movement of the piston in the housing is limited by the support of the upper face of the flange against the mouth of the bore in the housing 2.

 It should be noted that the piston is inserted into the housing 2 from the bottom.

In order to facilitate its introduction, the lugs are provided with an upper chamfer, whereby they can more easily deform and be brought more easily into their respective grooves.

Preferably laterally to each groove 21, the body 1 is provided with an elastic tab or clip.

At the base of the wall of the bore, the body 1 comprises a square-shaped base for example.

The underside of the base is intended to bear against the perimeter zone of the opening of the keyboard chassis in which the body of the contactor is inserted.

The elastic tabs each have a head and by the latter coming to bear against the perimeter zone of the opening, firmly hold the body of the contactor in place in the opening.

Advantageously, the membrane is designed so that the relationship between the force applied by the finger on the cap and the deformation of the membrane, represented by the distance traveled by the cap, passes through a maximum, this between the start of the course of the cabochon and the limit switch corresponding to the establishment of contact.

In other words, the slope of the curve is first positive then becomes zero and finally becomes negative until contact is established.

The maximum of this curve corresponds to a force applied to the cabochon equal to 0.45 Newton.

At the end of the stroke, the force required to maintain contact is around 0.3 newton.

 It is obvious that these values are given for information only and that they can vary within reasonable limits.

 It should be noted that the given curve takes into account the weight of the moving elements.

Finally, it should be noted that thanks to the tactile sensation provided by the aforementioned technical characteristics, the risk of simultaneous support on several cabochons is further reduced.

The arrangements as previously described allow the production of contactors for keypads of the alpha-numeric type with low pitch intended for intensive use.

 It goes without saying that the present invention can receive all arrangements and all variants without departing from the scope of this patent.

Claims (1)

  1.  R1 / Contactor for low-pitch alpha-numeric keypad
     nant a body (1) provided with a housing (2) in which is dis
     placed an elastic bell-shaped membrane (3) provided
     an electrically conductive element (4) brought into contact with
     two pads (5) of a printed circuit (6) by deformation of the
     membrane under the effect of the depression in the housing (2)
     a piston (8) guided in a bore (7) of the body (1), the
     said piston comprising a cabochon (9) having four faces
     lateral and an upper face (10) for supporting the charac
     terized in that the four lateral faces are inclined by
     so as to form an angle with the upper bearing face (10)
     obtuse dihedral and that said face is offset backwards,
     which makes it possible to separate the bearing face, as much as possible from
     cabochons of neighboring contactors.
    R2 / Contactor according to claim 1 characterized in that the
     front side of the lens (9) is more straightened than
     the other side faces.
    R3 / Contactor according to claim 1 characterized in that the
     upper face (10) of the cabochon is convex.
    R4 / Contactor according to claim 1 characterized in that the
     cabochon (9) is provided with two parallel legs (11) in
     protruding downwards, both rooted on its lower side
     apart, separated from each other, by which the cabochon
     is fixed in an axial housing (12) of the piston.
    R5 / Contactor according to claim 4 characterized in that the
     tabs (11) are forced into the housing
     axial (12) of the piston respectively on either side of a
     vertical median rib (13) of said housing partitioning this
     latest.
    R6 / Contactor according to claim 5 characterized in that the
     large faces of the rib (13) are each provided with a
     bead (14) extending along their entire height and that
     on either side of the rib (13), at the wall of the housing
     (12) are rooted two beads (15) extending along
     the entire height of the housing, the tabs (11) of the cabochon
     each being sandwiched between a bead (14) and the two
     corresponding beads (15).
    R7 / Contactor according to claim 4 characterized in that the
     legs each have a straight section in the shape of a rec
     tangle.
     R8 / Contactor according to claim 6 characterized in that
     each bead (15) has a flat face (15A) turned
     towards the large face of the rib (13), the tab (11) being
     sandwiched between the bead (14) and the flat faces (15A).
    R9 / Contactor according to claim 4 characterized in that the
     housing (11) on either side of the rib is equipped with
     two beads (16) in the interval of which is introduced
     you paw (11).
    R10 / Contactor according to claim 9 characterized in that
     the beads (16) each have a flat face (16A)
     vertical perpendicular to the long face of the rib
     (13).
    Rll / Contactor according to claim 1 characterized in that
     the piston following at least one of its generators comprises
     an external stud (17) which cooperates in sliding with a
     groove (18) of corresponding shape carved into the wall
     of the bore (7) of the body.
    R12 / Contactor according to claim 1 characterized in that the
     curve representing the relationship between the force applied by
     the finger on the cabochon and the deformation of the membrane,
     represented by the distance traveled by the lens, pre
     first feels a positive slope, then zero, corres
     laying at a maximum, then negative until establishment
     of the contact.
    R13 / Contactor according to claim 12 characterized in that
     the maximum of this curve corresponds to a force of 0.45
     newton.
    R14 / Contactor according to claim 12 characterized in that
     the force required at the end of the stroke to maintain the con
     tact is 0.3 newton.
FR8712914A 1987-09-14 1987-09-14 New type of contactor for low-step keyboard of the alpha-digital type Expired - Fee Related FR2620563B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8712914A FR2620563B1 (en) 1987-09-14 1987-09-14 New type of contactor for low-step keyboard of the alpha-digital type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8712914A FR2620563B1 (en) 1987-09-14 1987-09-14 New type of contactor for low-step keyboard of the alpha-digital type

Publications (2)

Publication Number Publication Date
FR2620563A1 true FR2620563A1 (en) 1989-03-17
FR2620563B1 FR2620563B1 (en) 1992-07-10

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ID=9355002

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8712914A Expired - Fee Related FR2620563B1 (en) 1987-09-14 1987-09-14 New type of contactor for low-step keyboard of the alpha-digital type

Country Status (1)

Country Link
FR (1) FR2620563B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8307578B1 (en) 2009-11-12 2012-11-13 Azhocar Frederick S Gun magazine-clip finger-tip supplemental-release tool
USD753257S1 (en) 2014-11-13 2016-04-05 Frederick Steven Azhocar Firearm tool
WO2018172468A1 (en) * 2017-03-24 2018-09-27 Cherry Gmbh Key module

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2169812A1 (en) * 1971-12-13 1973-09-14 Datanetics Corp
GB2070518A (en) * 1980-02-27 1981-09-09 Int Standard Electric Corp Type-printer keyboard
US4421432A (en) * 1981-09-04 1983-12-20 Honeywell Inc. Key switch cap mounting arrangement
US4565460A (en) * 1984-03-05 1986-01-21 Kline Alva C Convex key top configurations
US4659879A (en) * 1985-03-11 1987-04-21 Topre Corporation Key switch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2169812A1 (en) * 1971-12-13 1973-09-14 Datanetics Corp
GB2070518A (en) * 1980-02-27 1981-09-09 Int Standard Electric Corp Type-printer keyboard
US4421432A (en) * 1981-09-04 1983-12-20 Honeywell Inc. Key switch cap mounting arrangement
US4565460A (en) * 1984-03-05 1986-01-21 Kline Alva C Convex key top configurations
US4659879A (en) * 1985-03-11 1987-04-21 Topre Corporation Key switch

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8307578B1 (en) 2009-11-12 2012-11-13 Azhocar Frederick S Gun magazine-clip finger-tip supplemental-release tool
US8635799B2 (en) 2009-11-12 2014-01-28 Frederick S. Azhocar Gun magazine-clip finger-tip supplemental-release tool
USD753257S1 (en) 2014-11-13 2016-04-05 Frederick Steven Azhocar Firearm tool
WO2018172468A1 (en) * 2017-03-24 2018-09-27 Cherry Gmbh Key module

Also Published As

Publication number Publication date
FR2620563B1 (en) 1992-07-10

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Date Code Title Description
SN Distraint notified (in the national patent register)
ST Notification of lapse