JPH09320385A - Push button switch, manufacturing method thereof and keyboard manufacturing method using the same - Google Patents

Abstract

[PROBLEMS] To provide a push button switch used for an input device such as a personal computer, which can reduce the number of assembling steps and stabilize the quality and has a good operation feeling, and a manufacturing method thereof. With the goal. SOLUTION: The cup rubber 13 is directly pressed by the key top 15 through a ring portion at the center of the link member supporting the key top 15, and a combination of a first member 16 and a second member 17 constituting the link member. The inclined groove 16F is provided in the hole 16D of the first member 16 serving as the engaging portion,
By rounding the tip of the cylindrical protrusion 17D of the second member 17 to facilitate engagement, it is possible to provide a push button switch with a stable operation feeling and excellent assembly workability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push button switch used in an input device such as a personal computer, a method of manufacturing the same, and a method of manufacturing a keyboard using the same.

[0002]

2. Description of the Related Art The general structure of a conventional push button switch used for a keyboard device is that the stem portion provided on the key top is fitted into a guide portion provided on the case and slid to move the key top up and down. Some push button switches have such a structure, but if the push button switch is made thin, the length of the above fitting part becomes shorter, and if the end of the key top is pressed and operated, the key top tilts and twists. In order to solve this problem, the stem part of the key top and the guide part of the case are not fitted to each other, and the link member having an X-shaped side view is formed between the key top and the case. A thin push-button switch that moves a key top up and down with an intervening button has been proposed, one example of which is shown in FIG.
As shown in FIG.

FIG. 9 is a cross-sectional view of an essential part of the conventional thin push button switch, and FIG. 10 is a perspective view showing a link member of the push button switch. In FIG. 9, reference numeral 1 is a substrate made of a hard material such as a metal plate. A membrane sheet 2 having a membrane switch printed thereon is placed on the substrate 1, and a dome-shaped cup rubber 3 is arranged so as to correspond to the switch portion of the membrane sheet 2. Reference numeral 4 denotes a case made of synthetic resin, and the central square hole is made of synthetic resin. The first member 6 and the second member 7 are X-shaped link members in a side view.
An engaging recess 4A is provided to engage the support shafts 6B and 7B provided at the end of the shaft so as to be rotatable and slidable.

Further, the support shaft portions 6A and 7A provided at the other ends of the first member 6 and the second member 7 are rotatably engaged with a locking portion 5A provided on the key top 5 formed of synthetic resin. In addition, the central portion of the first member 6 has a cylindrical protrusion 6C.
And a long hole 7C provided in the center of the second member 7
Is rotatably and slidably engaged with the first member 6 and the second member 7 as a link member.

Further, a linear pressing portion 6D for operating the cup rubber 3 is provided at the center of the first member 6, and when the link members constituting this link mechanism are combined, the individual members are separated. First member 6 which is disjointed
An assembling method in which an operator manually combines the second member 7 and the second member 7 with each other has been generally adopted.

[0006]

However, in the conventional push-button switch having such a structure, the cup rubber 3 is used.
Since the linear pressing portion 6D is at a point about half the length of the first member 6 and the second member 7, the operation stroke of the cup rubber 3 is about half the stroke of the key top 5.
In addition, the operating load of the cup rubber 3 needs to be about twice as much as the load required for the key top 5, and the linear pressing portion 6D between the first member 6 and the cup rubber 3 moves to make an arc motion. However, there is a problem that it is difficult to manufacture the cup rubber 3 which is complicated and has a stable operation and a good operation feeling.

Further, in the above-mentioned conventional method, since the link members which are individually separated are manually assembled, there is a problem that it takes a lot of man-hours for the combination and that the quality of the finished product varies.

SUMMARY OF THE INVENTION The present invention is intended to solve such a conventional problem, and facilitates assembling, reduces the number of assembling steps and stabilizes the quality, and has a good operation feeling, and a manufacturing method thereof. It is an object to provide a keyboard manufacturing method using the same.

[0009]

In order to solve the above problems, in the push button switch of the present invention, the cup rubber is directly pressed by the key top through the ring portion in the middle of the connecting portion of the first member forming the link member. In addition to the above structure, an inclined groove is provided in the round hole of the first member which is a combined engaging portion of the first member and the second member, and the tip end of the cylindrical convex portion of the second member is rounded for engagement. It was made easy.

Thus, the operation stroke and the operation load of the key top and the cup rubber can be made the same, and the combination of the first member and the second member can be easily and stably performed, and a plurality of connected members can be connected. The first member and the second member can be combined at the same time by using a jig.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present invention, a pair of plate-like arm portions facing each other are connected at a central upper portion by a connecting portion having a ring portion in the middle thereof. A pair of plates facing each other with a molded resin first member provided with an inclined groove in which the plate thickness is gradually thinned in the plate thickness direction and is gradually widened obliquely downward in the plate thickness direction outside the circular holes respectively provided in the center. -Shaped arm portions are connected at one end with a support shaft to form a substantially U-shape, and cylindrical protrusions having rounded tips provided at substantially center inner sides of both arm portions have both arms of the first member. A second member made of a molding resin that forms a link member having an X-shape in side view and is inserted into and combined with a circular hole in the approximate center of the part, and an X-shape in side view composed of the first member and the second member. The support shaft portions of the first member and the second member, which are the lower support portions of the ring-shaped link member,
One is rotatable and the other is rotatably slidably held, and a support shaft portion of the first and second members serving as an upper support portion of the link member. One is rotatable and the other is rotatable and slidable. A key top made of a molded resin to be held on the first top, and a ring rubber in the middle of the connecting portion of the first member is inserted to constantly urge the key top upward, and a cup rubber having a convex portion at the lower center, and a cup rubber. Is a push-button switch composed of a substrate having a membrane switch having a contact portion that is pressed into contact with the convex portion of the substrate, and the key top is vertically engaged with the link member to move vertically without tilting,
Since the key top directly presses the cup rubber to perform the switching operation, the operation stroke and the operation load of the key top and the cup rubber are the same, and the operation feeling is good. Second
The roundness of the tip of the cylindrical protrusion of the member has the effect that two types of members can be easily combined.

According to a second aspect of the present invention, in the first aspect of the present invention, the support member of the first member that serves as the lower support portion of the X-shaped side view link member and the second member that serves as the upper support portion of the first member. Of the first member so that the tip ends of the cylindrical protrusions on the substantially central inner side of both arm portions of the second member fit into the lower ends of the inclined grooves on the lower outer sides of the substantially central portions of both arm portions of the first member without overlapping the support shaft portions. Member and second
The members are overlapped with each other, the first member is pressed diagonally to the second member, and the cylindrical protrusions of the two arm portions of the second member are inserted into the round holes of the both arm portions of the first member, and a side view X After forming a letter-shaped link member, this link member is a manufacturing method of a push button switch that is combined with a case, a key top, a cup rubber, and a substrate having a membrane switch on the upper surface. It has an effect that a link member and a push button switch using the same can be manufactured.

According to a third aspect of the present invention, in the invention according to the second aspect, a plurality of first members and second members are connected in a strip shape at the same pitch by using a spool runner at the time of molding. , The upper ends of the cylindrical grooves of the second members are fitted so as to fit the lower ends of the slanted grooves substantially outside the centers of the first members of the first members, and then a plurality of these are formed. Using the assembly jig that pushes diagonally at the same time at the same time, insert the cylindrical protrusions of both arm portions of each second member into the round holes of both arm portions of each first member and combine them, and then connect each connecting portion. Since the individual link members are formed by cutting, and the link member can be formed by simultaneously combining a plurality of first members and second members using a jig,
This has the effect of reducing the number of steps for assembling the push button switch and stabilizing the quality.

According to a fourth aspect of the present invention, in the first aspect of the present invention, two supporting shaft portions serving as lower support portions of the first member and the second member that form the X-shaped side view link member are provided. It has a size that protrudes outwards on both sides from the two support shafts that serve as the upper support, and uses spools and runners during molding to connect multiple strips at a pitch that matches the pitch of the keyboard keytops. Both the first member and the second member are provided so that the support shaft portion of the first member that serves as the lower support portion of the link member and the support shaft portion of the second member that serves as the upper support portion do not overlap. Part of the second member is overlapped so that the tips of the cylindrical projections of the inner sides of both arms of the second member fit in the lower ends of the inclined grooves, and then a plurality of these are simultaneously pressed in an oblique direction. Using the tool, the circle of both arm parts of each first member After inserting the column-shaped protrusions of both arm portions of each second member and combining them, each connecting member is cut and divided into individual link members, and at the same time, each link member is attached to each switch from the bottom surface side of the keyboard case. After dropping the square hole for use and engaging the two support shafts, which are the lower support of each link member, with the locking recesses for each push button switch, the substrate having the membrane switch on the top surface, the cup rubber, and the key top This is a method of manufacturing a keyboard in which the above are combined, and has the effect of significantly reducing the number of assembly steps for the entire keyboard.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a sectional view of a main part of a push button switch according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view showing an assembling method of the main part, and FIG. It is a side view which shows the combination method of a 2nd member.

In FIGS. 1 and 2, reference numeral 11 denotes a substrate made of a hard material such as a metal plate, on which a membrane sheet 12 having a membrane switch printed thereon is placed, and the switch portion of the membrane sheet 12 is placed. The dome-shaped cup rubber 13 is arranged so as to correspond to. Reference numeral 14 denotes a case formed of synthetic resin, which is provided with two guide walls 14A from both sides toward the central square hole, and a pair of locking recesses at the corners of the central square hole of the case 14. 14C and 14D are formed.

Reference numeral 15 is a key top made of synthetic resin, and the head portion 1 of the cup rubber 13 is located at the center of the back surface.
A cylindrical stem portion 15A with which 3A abuts is provided, and a pair of locking portions 15B and 15C are provided on both sides, respectively.

Reference numeral 16 is a first member made of synthetic resin, and both sides of the linear support shaft portion 16A are rotatably and slidably sandwiched between the locking recess 14D of the case 14 and the membrane sheet 12. And plate-shaped arm section 1 facing each other
A cylindrical support shaft portion 16C is provided inside the tip portion of 6B, and is rotatably engaged with a locking portion 15B of the key top 15.

Reference numeral 17 denotes a second member formed of synthetic resin, which is assembled so as to cross the outside of the first member 16 and
Both ends of the linear support shaft portion 17A are rotatably sandwiched between the locking recessed portion 14C of the case 14 and the membrane sheet 12, and a circle is formed on the outer side of the tip end of the opposed plate-shaped arm portion 17B. A columnar support shaft portion 17C is provided, and is engaged with the locking portion 15C of the key top 15 in a rotatable and slidable manner.

The plate-like arm portion 16 of the first member 16 is also provided.
In the round hole 16D for locking provided in the central portion of B, the second
A cylindrical convex portion 17D provided at the center of the plate-shaped arm portion 17B of the member 17 is rotatably engaged with the first member 1
6 and the second member 17 are configured to interlock with each other, and further, the cup rubber 13 passes through the ring portion provided in the connecting portion 16E at the upper center of the first member 16, and the head portion 13A thereof.
Engages with the stem portion 15A of the key top 15.

Next, a method of assembling the push button switch of the present embodiment having the above-mentioned structure will be described. First, the second member 17 is formed in the circular hole 16D for locking the first member 16.
The link member is formed by engaging and combining the cylindrical protrusions 17D of the first member, and the combination method is, as shown in FIG. 3A, a first member that serves as a lower support portion of the link member. The support shaft portion 16A of 16 and the lower support shaft portion 17C of the second member 17, which serves as the upper support portion, face each other so as not to overlap each other, and as shown in FIG.
At the lower end portion of the inclined groove 16F provided so as to become deeper and wider in the plate thickness direction and the planar direction as it goes downward at the outer lower part of the round hole 16D at the substantially center of each of the six arm portions 16B,
The first member 16 and the second member 17 are overlapped with each other so that the convex portion 17D having a rounded tip provided on the inside of the center of each of the arm portions 17B of the second member 17 fits into each other. ), By pressing the both in an oblique direction, the cylindrical convex portion 17D of the second member 17 is pressed.
The rounded portion of the tip slides along the inclined groove 16F of the first member 16, the cylindrical convex portion 17D fits into the round hole 16D, and as shown in FIG. The two members 17 are rotatably combined to form a link member, and at this time, the support shaft portion 16A of the first member 16 becomes the second member 17
It will be in a state of being sunk under the support shaft portion 17C.

Next, the both ends of the support shaft portion 16A of the first member 16 and the both ends of the support shaft portion 17A of the second member 17 of the combined link member are connected to the locking recess 1 of the link member of the case 14.
Insert at 4D and 14C.

Then, the cup rubber 13 is attached to the first member 16
Is inserted into the cup rubber positioning portion formed by the ring portion of the connecting portion 16E and the two guide walls 14A of the case 14, and subsequently, the substrate 11 having the membrane sheet 12 on the upper surface is combined and screwed or the like. After fixing to the case 14 by means of the key top 15 so that the support shaft portion 16C of the first member 16 and the support shaft portion 17C of the second member 17 of the link member engage with the locking portions 15B and 15C of the key top 15. Then, the assembly is completed, and at this time, the head portion 13A of the cup rubber 13 is engaged with the cylindrical stem portion 15A of the key top 15 by utilizing the tapered portion at the tip thereof.

Next, the operation of the push button switch according to this embodiment will be described. When a part of the upper surface of the key top 15 of the push button switch having the X-shaped side view link mechanism combined as described above is pressed with a fingertip, the pressed part first moves downward.

At this time, the first member 16 and the second member 1 engaged with the locking portions 15B and 15C of the key top 15
Support shaft portions 16C and 17C of 7 rotate and slide in rotation, and a support shaft portion 16A rotatably and slidably sandwiched between the case 14 and the membrane sheet 12 rotates and slides to support support shaft portion 17A.
Rotates.

In the above operation, the first member 16
The circular hole 16D and the cylindrical protrusion 17D of the second member 17 are engaged, so that the first member 16 and the second member 17
The key top 15 is pushed down in a substantially horizontal state regardless of which part of the key top 15 is pressed by the upward and downward movements of the cup top 13, and the convex portion 13B below the center of the cup rubber 13 that biases the key top 15 upwards causes the membrane. Sheet 1
The switch part 2 is pushed and the switch is turned on.

In the above description, the center of rotation of the first member 16 is the round hole 16D and the center of rotation of the second member 17 is the cylindrical convex portion 17D. However, the circular hole 16D and the cylindrical convex portion are not shown. 17
It goes without saying that D may be arranged in reverse.

(Second Embodiment) FIGS. 4 and 5 show a first embodiment.
A perspective view and a combination procedure showing a method for manufacturing a push button switch according to a second embodiment of the present invention, in which a plurality of link members are simultaneously formed by simultaneously combining a plurality of members and a plurality of second members in a strip shape. 6 is a perspective view showing a method of cutting a plurality of linked link members into individual link members.

First, as shown in FIGS. 4 and 5 (a), a connecting portion 17E of the second member 17 which is connected in a plurality of strips by using the spool / runner at the time of molding is specially assembled. The jigs were inserted into and positioned between the pair of positioning portions 22A of the receiving plate 22, and a plurality of strips were similarly connected from above by using spool runners during molding. The first member 16 is combined with the pair of narrow positioning portions 22B of the receiving plate 22 so that the connecting portion 16G is sandwiched therebetween and the outer side of the linear support shaft portion 16A is in contact,
As shown in FIG. 5B, the first member 16 is placed on the second member 17.

In this state, the support shaft portion 16A of each first member 16
And the support shaft portions 17C of the respective second members 17 do not overlap each other, and the rounded tips of the cylindrical convex portions 17D substantially inside the both arm portions 17B of the respective second members 17 have the same shape as those of the respective first members 16. The arm portion 16B is engaged so as to fit into the lower end portion of the inclined groove 16F below the outside of the center of the arm portion 16B.

Next, by pushing the upper surfaces of all the first members 16 downward by the pushing plate 21 which is a dedicated assembling jig shown in FIG. 4, the outside of the linear support shaft portion 16A is the receiving plate. The first member 16 descends downward along the narrow positioning portion 22B of 22 and when the support shaft portion 16A reaches the taper portion 22C at the lower end of the positioning portion 22B, as shown in FIG. Proceed diagonally downward along 22C.

At this time, both arm portions 16B of the first member 16
Both arm portions 1 of the second member 17 engaged with the inclined groove 16F of
The columnar convex portion 17D of 7B advances diagonally upward in the inclined groove 16F and fits into the circular hole 16D above it, and the support shaft portion 16A of the first member 16 becomes the support shaft portion 17C of the second member 17. As a result, as shown in FIG. 5D, the plurality of first members 16 and the plurality of second members 1 are inserted.
7 is combined with the round hole 16D and the columnar convex portion 17D, and a plurality of link members are formed by the first member 16 and the second member 17
It becomes the form connected by the spool runner.

FIG. 6 shows a method of separating the link members thus formed, which are connected to each other, into individual link members.
Is shown in a perspective view.

In the figure, reference numeral 23 is a cutting blade, 24 is a pedestal, and 25 is a chute. A plurality of linked link members are placed on the pedestal 24, and the connecting portions 16G and 17E are cut by the cutting blade 23 to be individually cut. Chute 2 as a link member for
5 is to be collected.

As a result, the link member can be formed efficiently and inexpensively, and the push button switch using the link member can be made inexpensive.

The direction in which a plurality of the first member 16 and the second member 17 are connected in a strip shape by using the spool / runner at the time of molding may be changed by 90 ° from that in the present embodiment. Of course.

(Third Embodiment) FIG. 7 is a perspective view for explaining a method of manufacturing a keyboard according to a third embodiment of the present invention. In FIG. 7, 18 and 19 are the same as those in the second embodiment. In addition, there are a plurality of first members and second members that form a link member connected in a strip shape by using a spool runner at the time of forming process. As shown in the plan view of the link member in FIG. The support shaft portion 18A of the first member 18 and the support shaft portion 19A of the second member 19 which are the lower support portions of each link member are respectively the support shaft portion 19B and the first member 19B of the second member 19 which are the upper support portions. The size is such that it protrudes outward from both sides of the support shaft portion 18B of 18 and the connection pitch is the square hole portion 2 for the switch of the keyboard case 20.
The strips are connected at a pitch of 0A, that is, a pitch that matches the arrangement pitch of the key tops.

Further, although 26 and 27 are the cutting blades and pedestals similar to those of the second embodiment, these blades 26
The arrangement pitch of A and the drop holes 27A is also matched to the arrangement pitch of the key tops.

The link members connected in a strip shape are the first member 1 which is in the upside-down direction of the second embodiment.
8 on the lower side and the second member 19 on the upper side are placed on the pedestal 27, and are individually cut by the cutting blade 26, and at the same time, dropped down from the drop hole 27A of the pedestal 27, as shown in FIG. The support shaft portion 1 of the first member 18 which is dropped into the switch square hole portion 20A of the keyboard case 20 with the lower surface side facing upward and serves as a lower support portion of each link member.
8A and the protrusions outwardly on both sides of the support shaft portion 19A of the second member 19 are respectively provided with locking recesses 20B of the keyboard case 20.
It is to be engaged with 20C, 20D, 20E.

After that, a keyboard having a membrane switch, a cup rubber and a key top is combined on the lower surface of the keyboard case 20 to complete a keyboard.

[0041]

As described above, according to the present invention, since the key top is engaged with the link member, the key top moves vertically without tilting and the cup rubber is directly pressed by the key top to perform the switching operation. The operation feeling is good and the link member can be easily and stably formed.
A link member in which a plurality of link member pieces are connected in a strip shape by a connecting portion using a spool / runner, the first member and the second member are collectively combined, and then the connecting portion is collectively cut. Can be assembled, and the advantageous effect that not only the number of steps can be reduced but also the quality can be stabilized can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a push button switch according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an assembling method of the main part.

FIG. 3 is a side view showing a method of combining the first member and the second member.

FIG. 4 is a perspective view showing a method for manufacturing a push button switch according to a second embodiment of the present invention.

FIG. 5 is a side view showing the same combination procedure.

FIG. 6 is a perspective view showing a method of cutting a plurality of linked link members into individual link members.

FIG. 7 is a perspective view showing a method of manufacturing a keyboard according to a third embodiment of the present invention.

FIG. 8 is a plan view of the link member.

FIG. 9 is a sectional view of a main part of a conventional thin push button switch.

FIG. 10 is a perspective view showing the link member.

[Explanation of symbols]

 11 substrate 12 membrane sheet 13 cup rubber 13A head 13B convex portion 14 case 14A guide wall 14C, 14D locking concave portion 15 key top 15A stem portion 15B, 15C locking portion 16 first member 16A, 16C spindle portion 16B arm portion 16D round hole 16E connecting part 16F inclined groove 16G connecting part 17 second member 17A, 17C supporting shaft part 17B arm part 17D convex part 17E connecting part 18 first member 18A, 18B supporting shaft part 19 second member 19A, 19B supporting shaft Part 20 Keyboard case 20A Square hole for switch 20B, 20C, 20D, 20E Locking recess 21 Push plate 22 Receiving plate 22A, 22B Positioning part 22C Tapered part 23 Cutting blade 24 Receptacle 25 Chute 26 Cutting blade 26A Blade 27 Receptacle 27A pit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Koma 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A pair of plate-shaped arm portions facing each other are connected at a central upper portion by a connecting portion having a ring portion in the middle, and a plate thickness is provided outside and below circular holes respectively provided at substantially central portions of both arm portions. In the direction, the plate thickness is gradually thin, and in the plane direction, a first member made of a molded resin having an inclined groove that gradually widens downward is provided, and one end of a pair of plate-shaped arm portions facing each other is connected by a support shaft to substantially A cylindrical convex portion having a rounded tip provided at the inside of the center of both arm portions and having a rounded tip is inserted from the outside into a round hole at the center of both arm portions of the first member, respectively, and combined. A second member made of a molding resin that constitutes a side-view X-shaped link member, and a first member that serves as a lower support portion of the side-view X-shaped link member formed of the first member and the second member; A case that holds the support shaft of the second member such that one is rotatable and the other is rotatable and slidable; 1st which becomes the upper support part of a link member
A key top made of a molded resin for holding the supporting member and the supporting shaft of the second member so that one is rotatable and the other is rotatable and slidable;
The key top is always urged upward by inserting the ring portion in the middle of the connecting portion of the first member, and has a cup rubber having a convex portion in the central lower portion and a contact portion pressed against the convex portion of the cup rubber. A push button switch consisting of a substrate with a membrane switch on the top surface. 2. An arm portion of the first member without the support shaft portion of the first member serving as the lower support portion of the X-shaped side view of the side member and the support shaft portion of the second member serving as the upper support portion overlapping each other. The first member and the second member so that the tips of the cylindrical protrusions on the substantially central inner side of both arm portions of the second member fit into the lower ends of the inclined grooves on the lower outer side of the central part.
The members are overlapped with each other, the first member is pressed diagonally to the second member, and the cylindrical protrusions of the two arm portions of the second member are inserted into the round holes of the both arm portions of the first member, and a side view X 2. The method for manufacturing a push button switch according to claim 1, wherein after forming the character-shaped link member, the link member is combined with a substrate having a case, a key top, a cup rubber and a membrane switch on the upper surface. 3. A plurality of first members and second members connected in a strip shape at the same pitch by using a spool runner at the time of molding are provided at a substantially outer center center of both arm portions of each first member. The lower ends of the inclined grooves are overlapped with each other so that the tips of the cylindrical protrusions inside the centers of both arms of each second member fit, and then a plurality of these are simultaneously pressed in an oblique direction by using an assembling jig. After inserting the cylindrical protrusions of both arm portions of each second member into the round holes of both arm portions of one member and combining them,
The method for manufacturing a push button switch according to claim 2, wherein each linking portion is cut to form an individual link member. 4. The two supporting shaft portions serving as lower supporting portions of the first member and the second member forming the link member having an X-shape in side view are located outwardly on both sides than the two supporting shaft portions serving as upper supporting portions. A plurality of first and second members connected in a strip shape at a pitch that matches the arrangement pitch of the keyboard key tops of the keyboard by using the spool runner at the time of molding The support shaft portion of the first member serving as the support portion and the support shaft portion of the second member serving as the upper support portion do not overlap with each other, and the second end is provided at the lower end portion of the inclined groove substantially outside the center of both arm portions of each first member. Both arms of the member are stacked so that the tips of the cylindrical protrusions inside the center are fitted together, and then a plurality of these are simultaneously pressed in an oblique direction by using an assembly jig to make round holes in both arms of each first member. Insert the cylindrical protrusions of both arms of each second member into After mating, each connecting part is cut and divided into individual link members, and at the same time, each link member is dropped into the switch square hole from the lower surface side of the keyboard case to form two lower support parts for each link member. 2. The method for manufacturing a keyboard using a push button switch according to claim 1, wherein a substrate having a membrane switch on an upper surface thereof, a cup rubber and a key top are combined after the support shaft portion is engaged with a locking recess for each push button switch.