CN1484265A

CN1484265A - push lever switch

Info

Publication number: CN1484265A
Application number: CNA03127496XA
Authority: CN
Inventors: 六波罗贵久; 树; 海野隆树
Original assignee: Mikaku Electronic Industry Co Ltd (jp) Tokyo Japan
Current assignee: Mikaku Electronic Industry Co Ltd (jp) Tokyo Japan
Priority date: 2002-06-07
Filing date: 2003-06-07
Publication date: 2004-03-24
Anticipated expiration: 2023-06-07
Also published as: CN100472691C; JP2004063450A

Abstract

A push bar switch. The existing U-shaped contact reed switch is extremely thin because the extremely small and narrow reed (less than 1.0mm) is integrally installed on the push bar. It is necessary to form a stable structure to withstand hundreds of thousands of It is difficult to switch twice, and it is also difficult to give the U-shaped contact reed the spring force required for the switch. A push rod switch that solves the above problems. The switch is extremely small, thin, stable and durable. It is provided with a contact reed assembly A and a push rod assembly B. The contact reed assembly A uses riveting and other fixing means to connect the double touch The point reed is integrally fixed on the reed holder made of high-strength metal; the pressing rod assembly B installs the contact reed assembly A under the pressing rod so that the two are integrated. Insert the pressing lever assembly B into the case so that the outer contact reed contact a is in contact with the fixed contact of the case (ON) and the inner contact reed contact a' is opposite to the fixed contact (OFF) state, while making the operating part protrude from the case.

Description

Press lever switch

Technical field

The present invention relates to press lever switch, this kind switch has the pressing lever assembly, fixing means such as this pressing lever assembly utilization riveted joint are fixed on the double-contact reed integratedly and form contact spring assembly on the reed retainer, with contact spring assembly be installed in pressing lever below, make both as a whole; This pressing lever assembly is inserted in the shell, the contact of outer contacts reed is in the fixed contact contact (ON) of shell, the contact of inboard contact reed is in the relative separately state that separates (OFF) with fixed contact, make operating portion protrude in shell, therefore, a kind of very little and thin stability, the press lever switch of excellent in te pins of durability are provided.

Background technology

With horizontal U font reed (contact reed, brush) and retainer (pressing lever, action element) structure for " contact reed " assembly of one is the initial exploitation of China invites the person, till now, at the various switches relevant with this contact spring assembly, many patent applications have been proposed, the Japanese patent laid-open 5-211021 of famous being called " push switch " (the flat 4-183002 of special hope) (speciallyying permit No. 3118086); Name is called the Japanese patent laid-open 6-124623 (the special flat 4-297666 of hope) of " push switch "; Name is called the Japanese patent laid-open 10-50174 (the special flat 8-216164 of hope) of " the U-shaped contact reed of switch " etc.

For example, above-mentioned spy opens the switch designs put down in writing among the flat 10-50174 and is shape as thin as a wafer, its U-shaped contact reed is made of inside and outside two-layer elongated reed, but the contact spring assembly this respect is set for this U-shaped contact reed is installed on the pressing lever (action element) integratedly, though suitable as far as possible its support (spring contact effect aspect does not play the part of elastic reaction) of installing, but problem is, because (for example with minimal type and elongated reed, width 1.0mm is following) be installed on the pressing lever, so wanting to be mounted to stable structure is difficult to stand hundreds thousand of inferior on-off actions, and, because reed is little and elongated, even two-layer elastic force is still very weak, therefore the problem that exists is, the contact that is not enough to not made this reed and fixed contact produce enough pressures that contacts of trembling, and also deficiency etc. of the original position restoring force of pressing lever (action element).Past becomes possibility in order to make above-mentioned little and thin press lever switch structure, by both strong stable connections, meanwhile, wishes that exploitation provides the effective means of the elastic force that can increase reed between U-shaped contact reed and pressing lever.

Summary of the invention

The present invention has solved the problems referred to above by " contact spring assembly " and " pressing lever assembly " is set.Described " contact spring assembly ", before will being installed on the pressing lever by the contact reed that above-mentioned elongated inside and outside two-layer reed constitutes, this double-contact reed is fastened on the reed retainer that is fixed on high duty metal system U-shaped parts integratedly with suitable fixing means such as riveted joints, utilize durable stable structure, increased the elastic force of reed; Then this contact spring assembly is installed in and forms the pressing lever assembly on the pressing lever.In addition,,, carry out the versatility exploitation again, in the future, can improve the versatility of U-shaped contact reed especially with the moving contact member (parts) that the contact spring assembly of exploitation is used as various switches for addressing the above problem.

[press lever switch]

The present invention has solved the problems referred to above by press lever switch, and this switch comprises:

Set contact spring assembly, this contact spring assembly is being that two elongated U-shaped contact reeds constituting of the contact portion of contact are as the double-contact reed by support, U-shaped portion and with the front end, the contact of outer contacts reed is overlapped in the place ahead of the contact of inboard contact reed with staggering

And, be provided with the reed retainer that forms by bent sheet metal, this reed retainer is made up of the installation portion of fixing this double-contact reed support, the U-shaped portion lid that covers U-shaped portion and contact portion and contact portion lid, and two side-prominently is provided with little fulcrum shaft what U-shaped portion covered

With the support that compresses the double-contact reed to the inside and the power of the holding state of contact portion, above-mentioned double-contact reed is entrenched in the inboard of this reed retainer, meanwhile, the support one is fixed to installation portion with fixing means such as riveted joints,

Constitute by the fulcrum shaft of an end and the chevron operating portion of the other end, and be the center in set angle setting operation portion freely to rotate, and be provided with pressing lever with pivot suspension this fulcrum shaft on shell,

The installation portion with above-mentioned contact spring assembly be connected to this pressing lever below in, in the centre bore with the fulcrum shaft that is entrenched in pressing lever of the little fulcrum shaft concentric shafts shape of contact spring assembly, pressing lever and contact spring assembly are combined, and be provided with the pressing lever assembly

This pressing lever assembly is inserted in the shell, with its fulcrum shaft pivot suspension and be installed in freely to rotate with set angle in the axis hole of shell, make the double-contact reed the outer contacts reed contact and shell fixed contact contact (ON), inboard contact reed contact separate relative (OFF) with the fixed contact of shell and be provided with, meanwhile, utilize the recovery elastic force of double-contact reed, it is that rotate upward at the center with the fulcrum shaft that this pressing lever assembly application of force is made it, and makes the outstanding outside that is arranged on shell of its operating portion.

[push-button switch]

And the present invention utilizes push-button switch to solve the problems referred to above, and this switch comprises,

Contact spring assembly is inserted in the shell, the fulcrum shaft of its U-shaped portion lid sets up and at set angle freely to rotate in the axis hole of pivot suspension at shell, meanwhile, make the contact of outer contacts reed contact (ON) with the fixed contact of shell, the support of button is positioned on the installation portion of this contact spring assembly, utilizing when the recovery elastic force of outer contacts reed rotates it to the contact spring assembly application of force upward, make the button portion of button outstanding, and the contact of inboard contact reed separate (OFF) with the fixed contact of shell from shell.

[various switch contact spring assembly]

Further, the present invention utilizes various switches to solve the problems referred to above with contact spring assembly, and described various switches comprise with contact spring assembly:

With by support, U-shaped portion and with the front end be two elongated U-shaped contact reeds constituting of the contact portion of contact as the double-contact reed, the contact of outer contacts reed is overlapped in the place ahead of the contact of inboard contact reed with staggering;

Be provided with the reed retainer that forms by bent sheet metal, this reed retainer is made up of the support of double-contact reed, the installation portion that covers U-shaped portion and contact portion, U-shaped portion lid and contact portion lid, and two side-prominently is provided with little fulcrum shaft what U-shaped portion covered; With the support that compresses the double-contact reed to the inside and the power of the holding state of contact portion, above-mentioned double-contact reed is entrenched in the U-shaped portion lid of this reed retainer, meanwhile, with fixing means such as riveted joint grade with the support overall fixed to installation portion.

Description of drawings

Fig. 1 is front elevation, plane graph, right hand view and the subsequent figures of embodiment of the invention push switch;

Fig. 2 is the profile of D-D along the line in the plane graph of Fig. 1;

Fig. 3 is the operating instruction figure of Fig. 2;

Fig. 4 is front elevation, plane graph and the E direction view of contact spring assembly;

Fig. 5 is front elevation, plane graph and the left surface figure of outer contacts reed;

Fig. 6 is front elevation, plane graph and the left surface figure of inboard contact reed;

Fig. 7 is front elevation, plane graph and the left surface figure of reed retainer;

Fig. 8 is front elevation, plane graph, right hand view and the ground plan of pressing lever;

Fig. 9 is the profile of F-F along the line in the plane graph of Fig. 8;

Figure 10 is front elevation, plane graph, right hand view and the subsequent figures of shell;

Figure 11 is the profile of G-G along the line in the plane graph of Figure 10;

Figure 12 is the profile of H-H along the line in the plane graph of Figure 10;

Figure 13 is the sectional arrangement drawing of embodiment of the invention push-button switch.

Description of reference numerals

A is a contact spring assembly, and B is the pressing lever assembly, and C is a button, a, a ' are the contacts, and 1a is the outer contacts reed, 1b is an inboard contact reed, the 2nd, and support, 2a are the kick sheets, 2b is a コ shape portion, the 3rd, and U-shaped portion, the 4th, contact portion, the 5th, reed retainer, the 6th, installation portion, the 7th, U-shaped portion lid, the 8th, contact portion lid, the 9th, little fulcrum shaft, the 10th, pressing lever, the 11st, fulcrum shaft, 11a are centre bores, and 11b is a seam, the 12nd, operating portion, the 13rd, shell, the 14th, axis hole, the 15th, fixed contact (shared), the 16th, fixed contact, the 17th, recess, the 18th, rib.

Embodiment

[press lever switch] is (with reference to Fig. 1-Figure 12)

With two elongated U-shaped contact reed 1a, 1b constituting as the contact portion 4 of contact a, a ' by support 2, U-shaped portion 3 with front end as double-contact reed 1a, 1b, it makes the contact a of outer contacts reed 1a overlap in the place ahead of the contact a ' of inboard contact reed 1b with staggering

The reed retainer 5 that setting forms by bent sheet metal, this reed retainer 5 is made up of the installation portion 6 of the support 2 of fixing this double-contact reed 1a, 1b and the U-shaped portion lid 7 and the contact portion lid 8 of covering U-shaped portion 3 and contact portion 4, and side-prominently be provided with little fulcrum shaft 9 at two of U-shaped portion lid 7

With the

support

2,2 that compresses double-contact reed 1a, 1b to the inside and the power of the holding state of

contact portion

4,4, above-mentioned double-contact reed 1a, 1b are entrenched in the inboard of this reed retainer 5, meanwhile, with fixing means such as riveted joint with

support

2,2 overall fixed to installation portion 6, and be provided with contact spring assembly A

Constitute by the fulcrum shaft 11 of an end and the chevron operating portion 12 of the other end, and be provided with the operating portion 12 that freely rotates with set angle as the center with pivot suspension this fulcrum shaft 11 on shell 13 etc., and be provided with pressing lever 10,

The installation portion 6 with above-mentioned contact spring assembly A be connected to this pressing lever 10 below in, with the little fulcrum shaft 9 concentric shafts shapes of contact spring assembly A be entrenched among the centre bore 11a of fulcrum shaft 11 of pressing lever 10, be provided with the pressing lever assembly B that pressing lever 10 and contact spring assembly A are combined thus;

This pressing lever assembly B is inserted in the shell 13, described fulcrum shaft 11 pivot suspensions also are installed in set angle in the axis hole 14 of shell 13 freely to rotate, double-contact reed 1a, the contact a of the outer contacts reed 1a of 1b contacts (ON) with the fixed contact 15 of shell 13, the contact a ' of inboard contact reed 1b and 16 relative the separating of fixed contact (OFF) of shell 13, meanwhile, utilize double-contact reed 1a, the recovery elastic force of 1b, to this pressing lever assembly B application of force, making it is that rotate upward at the center with fulcrum shaft 11, make its operating portion 12 outstanding outsides that are arranged on shell 13, and be provided with press lever switch.

The means of the support 2 that is used for fixing double-contact reed 1a, 1b of contact spring assembly A and the installation portion 6 of reed retainer 5 are, outstanding kick sheet 2a and the riveted joint that is arranged on support 2 both sides of outer contacts reed 1a of on the installation portion 6 of the support 2 of inboard contact reed 1b and reed retainer 5, reeling, carry out fixing of integral body etc., if the means that the three is integrally fixed, riveted joint, welding, scolding tin welding or bonding etc. with binding agent all be suitable.

Illustrated embodiment (Fig. 4-Fig. 7) describe to contact spring assembly A, outer contacts reed 1a is by support 2, U-shaped portion 3 and form with the contact portion 4 of front end as contact a, support 2 two side-prominent kick sheet 2a is set in, the front end of support 2 is curved＜shape (Fig. 5), inboard contact reed 1b is by support 2, U-shaped portion 3 and form with the contact portion 4 of front end as contact b, when the front end of support 2 forms the コ shape 2b of portion, formation is than the contact portion 4 (Fig. 6) of contact portion 4 weak points of outer contacts reed 1a, reed retainer 5 is by installation portion 6, U-shaped portion lid 7 and contact portion lid 8 are formed, the outstanding little fulcrum shaft 9 (Fig. 7) that is provided with in the two sides of U-shaped portion lid 7

With above-mentioned outer contacts reed 1a and inboard contact reed 1b coincidence becoming double-contact reed 1a, 1b, to compress double-contact reed 1a to the inside, the support 2 of 1b, 2 and

contact portion

4,4 the power of holding state, with this double-contact reed 1a, 1b is entrenched in the inboard of reed retainer 5, meanwhile, at the support 2 of inboard contact reed 1b and the outstanding kick sheet 2a that is arranged on support 2 both sides of outer contacts reed 1a of installation portion 6 coilings of reed retainer 5, riveted joint two front ends on installation portion 6, with

support

2,2, installation portion 6 is integrally fixing, and, with the support 2 of outer contacts reed 1a＜crimping of shape curved end is fixed on below the inboard contact reed 1b support 2.

Contact spring assembly A is installed on the pressing lever 10 suits with these means that pressing lever assembly B is set, comprise: as shown shown in the example (seeing figures.1.and.2), on the one hand, form the recess 17 of the U-shaped portion lid 7 that inserts contact spring assembly A in an end bottom of pressing lever 10 (with reference to Fig. 8 and 9), the outstanding fulcrum shaft 11 that is provided with in the left and right sides of this recess 17, when the center of this fulcrum shaft 11 has centre bore 11a, have seam 11b between below this centre bore 11a and the fulcrum shaft 11, contact spring assembly A intercalation is to above-mentioned recess 17, the little fulcrum shaft 9 of its both sides passes above-mentioned seam 11b and is entrenched among this centre bore 11a, diaxon is the concentric shafts shape and installs, on the other hand, the コ shape 2b of portion that the front end of the support 2 of the inboard contact reed 1b of contact spring assembly A forms is chimeric with the rib 18 that is darted at below the pressing lever 10, prevent the side-to-side vibrations of this contact spring assembly A front end, and contact spring assembly A is installed together with pressing lever assembly B.

Embodiment

[push-button switch] (with reference to Figure 13)

Push-button switch has such structure: contact spring assembly A is inserted in the shell 13, the fulcrum shaft 9 of its U-shaped portion lid 7 set up and with set angle freely to rotate pivot suspension in the axis hole 14 of shell 13, meanwhile, the contact a of outer contacts reed 1a contacts (ON) with the fixed contact 15 of shell 13, the support of button C is positioned on the installation portion 6 of this contact spring assembly A, when the recovery elastic force that utilizes outer contacts reed 1a rotates it to the contact spring assembly A application of force upward, the button portion of button C is outstanding from shell 13, and the contact a ' of inboard contact reed 1b separates (OFF) with the fixed contact 16 of shell 13.

Embodiment (with reference to Fig. 4,2 and 13)

[various switch contact spring assembly]

Further, the invention provides various switches contact spring assembly A, this assembly as double-contact reed 1a, 1b, makes the contact a of its outer contacts reed 1a overlap in the place ahead of the contact a ' of inboard contact reed 1b with 2 U-shaped contact reed 1a, 1b constituting as the contact portion 4 of contact a, a ' by support 2, U-shaped portion 3 and with front end with staggering;

Be provided with the reed retainer 5 that forms by bent sheet metal, this reed retainer 5 is made up of the support 2 of this double-contact reed 1a, 1b, the installation portion 6 that covers U-shaped portion 3 and contact portion 4, U-shaped portion lid 7 and contact portion lid 8, and U-shaped portion cover 7 two side-prominently be provided with little fulcrum shaft 9; With the

support

contact portion

4,4, above-mentioned double-contact reed 1a, 1b are entrenched in the U-shaped portion lid 7 of this reed retainer 5, meanwhile

support

2,2 overall fixed are arrived installation portion 6 with fixing means such as riveted joints.

Effect

Operating portion 12 by pressing pressing lever or button C etc., in case contact spring assembly A is that fulcrum rotates with

fulcrum shaft

11 or 9, its double-contact reed 1a, 1b rotate simultaneously, when just the contact a of the outer contacts reed 1a of contact more effectively is crimped on the fixed contact 15 from beginning as common return, the contact a ' of inboard contact reed 1b is crimped on the fixed contact 16 switch ON (opening).

In case remove pushing to operating portion 12 or button C etc., recovery elastic force by double-contact reed 1a, 1b, contact spring assembly A is that fulcrum rotates recovery with

fulcrum shaft

11 or 9, the contact a ' of inboard contact reed 1b leaves fixed contact 16, switch OFF (closing) (the contact a of outer contacts reed 1a still contacts fixed contact 15), meanwhile, the operating portion 12 of pressing lever or button C restore to the original state.

Effect

Owing to like this contact spring assembly is set, with the support that compresses to the inside the double-contact reed and The power of the holding state of contact section is entrenched in the double-contact reed on the reed retainer of high duty metal system, Meanwhile, integratedly support is fixed on the installation portion with fixing means such as riveted joints, so, The contact section of each contact reed can keep powerful elastic force, even (set at the width of contact reed Be the width roughly the same with reed retainer 5) set in the minimum situation, also can obtain fully Spring force, so that performance is as effect, the effect of switch, but the movable contact of contact reed just The setting contact of point and the fixed contact of shell keep, tremble prevent and by pressure welding institute The effect of the cleaning of playing, effect.

Equally, will be two with the power of the holding state of the support that compresses to the inside the double-contact reed and contact section Contact reed is entrenched on the reed retainer of high duty metal system, and meanwhile, usefulness riveted joint etc. are solid Decide means and integratedly support is fixed on the installation portion, because contact spring assembly is set like this, Can access the contact spring assembly of very strong stable, the excellent in te pins of durability of structure.

Novel being characterised in that is according to above-mentioned characteristic with become the reed retainer of strong matrix Width consistent, can set the width of contact reed and the width of pressing lever (thickness), therefore, Can form minimum and thin press lever switch.

Be characterised in that, owing to cover outstanding establishing in the U-shaped section of the reed retainer of contact spring assembly Little fulcrum shaft is arranged, and with the fulcrum shaft concentric shafts shape ground of pressing lever this little fulcrum shaft is installed, when to press When the fulcrum shaft of depression bar is the fulcrum rotating operation, contact spring assembly also with identical fulcrum along identical Orbit rotation, can not produce the imbalance in the operation.

By the little fulcrum shaft of spring assembly, concentric shafts shape ground is installed in pressing lever with two fulcrum shafts and props up In the seam of some axle, meanwhile, only with the コ shaped part of the inboard contact reed of contact spring assembly Be entrenched on the outstanding rib that is arranged at below the pressing lever, having can be very simply, promptly assembling With the advantage of dismounting pressing lever assembly, and, behind the shell of packing into, utilize the elastic force of double-contact reed, Have and effectively to prevent the characteristics that assembly direction departs from.

The advantage that contact spring assembly is bigger is, with the pressing lever of operating contact spring assembly, press The shape of button etc., size irrespectively be arranged in the shell, can bring into play its effect, effect owing to have Characteristics as independent parts (parts), can be common to various switches with this contact spring assembly.

Claims

1. A push rod switch, comprising:

The contact reed assembly consists of two slender U-shaped contact reeds composed of a support part, a U-shaped part and a contact part with the front end as a double contact reed, so that the outer contact reed The contacts of the inner contact spring coincide in a staggered manner in front of the contacts of the inner contact spring,

And there is a reed holder formed by bending a metal sheet. The reed holder is composed of a mounting part that fixes the double-contact reed support part, a U-shaped part cover that covers the U-shaped part and the contact part, and a contact. A small fulcrum shaft protrudes from both sides of the U-shaped part cover to compress the supporting part of the double-contact reed and the power-storing state of the contact part inwardly, and insert the double-contact reed Closed on the inner side of the reed holder, at the same time, use riveting and other fixing means to integrally fix the support part to the installation part;

The pressing lever is composed of a fulcrum shaft at one end and a mountain-shaped operating part at the other end, and the operating part is provided with the operating part freely rotatable at a set angle around the fulcrum shaft pivotally supported on the shell or the like; the pressing lever assembly, While connecting the mounting part of the contact reed assembly to the bottom of the pressing rod, the small fulcrum shaft of the contact reed assembly is concentrically fitted into the central hole of the fulcrum shaft of the pressing rod , combining the pressing lever and the contact reed assembly together,

Insert the pressing rod assembly into the shell, pivotally support the fulcrum shaft and install it freely rotatably in the shaft hole of the shell at a set angle, so that the contacts of the outer contact reed of the double contact reed are in contact with the The fixed contact of the shell is in contact (ON), and the contact of the inner contact reed is separated (OFF) from the fixed contact of the shell and is arranged oppositely. At the same time, the pressing force of the double contact reed is used to The rod assembly exerts force to rotate upward around the fulcrum axis, and its operating part protrudes from the outside of the casing.

2. The push rod switch according to claim 1, wherein the means for fixing the supporting part of the double contact reed and the mounting part of the reed holder of the contact reed assembly is that the inner contact The supporting part of the reed and the mounting part of the reed holder are wound and riveted to the small protrusions protruding on both sides of the supporting part of the outer contact reed, and the whole is fixed, etc. If the three are fixed as a whole The means of riveting, welding, soldering or bonding with adhesives are all suitable.

3. The push lever switch according to claim 1, characterized in that: a contact reed assembly is provided, and the outer contact reed is composed of a supporting part, a U-shaped part and a contact part with the front end as a contact, The small protruding pieces are protruded on both sides of the supporting part. At the same time, the inner contact reed is composed of a supporting part, a U-shaped part and a contact part with the front end as a contact, and a U-shaped shape is formed at the front end of the supporting part. At the same time, the contact part is made shorter than the contact part of the outer contact reed. The reed holder is composed of a mounting part, a U-shaped part cover and a contact part cover, and on both sides of the U-shaped part cover. A small fulcrum shaft is protrudingly provided, and the outer contact reed and the inner contact reed are overlapped to form a double contact reed, so as to compress the supporting part and the contact part of the double contact reed inwardly in the power storage state, The double contact reed is fitted inside the reed holder, and at the same time, the supporting part of the inner contact reed and the mounting part of the reed holder are wound and protruded to the support of the outer contact reed. The small protruding pieces on both sides of the mounting part are riveted to the two front ends on the mounting part to fix the three as a whole.

4. The push lever switch according to claim 1, characterized in that: the means for installing the push lever assembly by installing the contact reed assembly on the push lever comprises: forming an insertion contact spring at the lower part of one end of the push lever In the concave part of the U-shaped part cover of the chip assembly, a fulcrum shaft is protruded on the left and right sides of the concave part. While a central hole is opened in the center of the fulcrum shaft, a slit is opened between the central hole and the lower side of the fulcrum shaft. Insert the contact spring assembly into the recess, make the small fulcrum shafts on both sides pass through the seam and fit into the center hole, and install the two shafts concentrically. On the other hand, the contact spring The U-shaped portion of the inner contact reed of the sheet assembly fits on the rib protruding from the lower side of the pressing rod, so as to prevent the left and right vibration of the front end of the contact reed assembly.

5. A button switch, which includes: inserting the contact reed assembly into the shell, erecting the fulcrum shaft of the U-shaped part cover and pivotally supporting it in the shaft hole of the shell freely rotating at a set angle, and At the same time, make the contact of the outer contact reed contact with the fixed contact of the shell (ON), and position the supporting part of the button on the mounting part of the contact reed assembly, and use the outer contact reed to restore the elastic force to the While the contact spring assembly is biased to rotate upward, the button portion of the push button protrudes from the housing, and the contacts of the inner contact spring separate (OFF) from the fixed contacts of the housing.

6. A contact reed assembly for various switches, comprising:

Two slender U-shaped contact reeds composed of a support part, a U-shaped part and a contact part with the front end as a double contact reed make the contacts of the outer contact reeds contact on the inner side. The fronts of the contacts of the dot reeds overlap in a staggered manner;

A reed holder formed by bending a metal sheet is provided, and the reed holder is composed of the support part of the double contact reed, the mounting part covering the U-shaped part and the contact part, the U-shaped part cover, and the contact part cover. Composed, and a small fulcrum shaft protrudes from both sides of the U-shaped part cover; the double-contact reed is embedded in the state of accumulating force inwardly compressing the supporting part and the contact part of the double-contact reed The U-shaped portion of the reed holder is covered, and at the same time, the entire supporting portion is fixed on the mounting portion by fixing means such as riveting.