CN113851347B

CN113851347B - Light touch switch and wiring method thereof

Info

Publication number: CN113851347B
Application number: CN202111167984.9A
Authority: CN
Inventors: 卢建昆; 羊建伟
Original assignee: Dongguan Linhong Technology Co ltd
Current assignee: Dongguan Linhong Technology Co ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2024-10-18
Anticipated expiration: 2041-10-08
Also published as: CN113851347A

Abstract

The invention relates to a tact switch and a wiring method thereof, wherein a protruding part is arranged between a first fixed contact and a second fixed contact on the inner bottom surface of a switch box, and after the elastic sheet contacts the protruding part, the second fixed contact and a third fixed contact which are kept in contact in a normal state are disconnected by pressing the elastic sheet by a driving body, so that the third fixed contact is connected with the first fixed contact by the elastic sheet, and single-pole double throw and/or single-pole single throw can be realized by different wiring modes.

Description

Light touch switch and wiring method thereof

Technical Field

The invention relates to the technical field of tact switches, in particular to a tact switch and a wiring method thereof.

Background

The tact switch is widely used in household appliances, automobiles and the like because of its small size and light weight. The tact switch is an electronic switch and belongs to the class of electronic components. The switch consists of an insert, a base, an elastic sheet, a button and a cover plate, when in use, the switch can be turned on by lightly pressing the switch button, and when the hand is released, the switch is turned off, and the internal structure of the switch is realized by the elastic force of the metal elastic sheet. Depending on the structure, the tact switch may be of the single pole double throw type, single pole single throw type, or the like.

In the prior art, chinese patent application publication No. CN1444243 a discloses a push button switch in which a first movable contact constituted by a ring-shaped portion and a protruding portion protruding from the ring-shaped portion in the same width is opposed to a peripheral fixed contact and a central fixed contact on the bottom surface of a switch case, and the ring-shaped portion is spaced from the peripheral fixed contact by a predetermined interval. The prior art provides a push button switch which occupies a small space due to its small size and can conveniently set two-stage operation of the operation force of each switch. The prior art has the following defects: the function of single-pole double-throw can be realized through two-stage actions only by arranging a complex combined spring plate structure in a narrow space.

In the prior art, the structure of the prior art is only capable of realizing single-pole single-throw function, and the prior art such as CN205810632U, CN205004218U and the like cannot realize the single-pole double-throw function on the basis.

Therefore, improvements are needed based on the existing tact switches, single pole double throw and/or single pole single throw are realized in a narrow space by using a simple structure, and certain improvements are made on the difficulty of disassembly and assembly of the structure and the reliability of the structure.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a tact switch and a wiring method thereof aiming at the defects of the prior art.

In a first aspect, an embodiment of the present invention provides a tact switch, including: a switch box with an opening is arranged on the upper surface; a first fixed contact formed at the center on the inner bottom surface of the switch case; a second fixed contact and a third fixed contact formed on the inner bottom surface of the switch box and clamping the first fixed contact; a first connection terminal, a second connection terminal, and a third connection terminal electrically connected to the first fixed contact, the second fixed contact, and the third fixed contact, respectively, at an outer periphery of the switch case; a protrusion formed on an inner bottom surface of the switch case and located between the first fixed contact and the second fixed contact; a spring piece which is arranged in the switch box and keeps contact with the second fixed contact and the third fixed contact under the action of no external force, wherein the spring piece is provided with a first contact which keeps contact with the second fixed contact and a second contact which keeps contact with the third fixed contact; and a driving body having a pressing spring, the driving body being disposed above the spring so as to be movable up and down; the driving body descends to press the elastic sheet after being acted by external force, the center of the elastic sheet is pressed to be partially deformed to be contacted with the first fixed contact, the elastic sheet is contacted with the protruding part in the process of partial deformation, and the protruding part is used as a supporting point to lift the first contact so as to release the contact state of the first contact and the second fixed contact.

In some embodiments, the first fixed contact and the first connection terminal are integrally formed first metal pieces, the second fixed contact and the second connection terminal are integrally formed second metal pieces, and the third fixed contact and the third connection terminal are integrally formed third metal pieces.

In some embodiments, a fourth connection terminal is disposed on the outer periphery of the switch box, and the fourth connection terminal and the first metal piece are integrally formed.

In some of these embodiments, the second, third and fourth metal pieces are integrally injection molded with the switch box.

In some of these embodiments, the spring has a central portion and a peripheral annular portion at the center, the central portion being higher than the annular portion, the central portion and the annular portion being joined by a conical ring.

In some of these embodiments, the protrusion is above the first, second, and third fixed contacts, and the first fixed contact is below the second and third fixed contacts.

In some embodiments, the periphery of the driving body is connected with a positioning part through a bridging part, the positioning part is erected on the end face of the opening of the switch box, the positioning part is vertically fixed through the buckling of the cover plate and the switch box, the cover plate is provided with a vertical extension part, the extension part is provided with a clamping hole, and the protruding part on the periphery of the positioning part is clamped in the clamping hole to horizontally fix the positioning part.

In a second aspect, an embodiment of the present invention provides a method for wiring a tact switch, using a tact switch as in the first aspect, including: one path of the load is electrically connected with the second connecting terminal, one path of the load is electrically connected with the third connecting terminal, one path of the load is electrically connected with the first connecting terminal, the load forms a first loop through the second connecting terminal, the elastic sheet and the third connecting terminal, the load forms a second loop through the third connecting terminal, the elastic sheet and the first connecting terminal, and the first loop and the second loop are switched by pressing the elastic sheet.

In a third aspect, an embodiment of the present invention provides a method for wiring a tact switch, using a tact switch as in the first aspect, including: one path of the load is electrically connected with the second connecting terminal, the other path of the load is electrically connected with the third connecting terminal, the load forms a third loop through the second connecting terminal, the elastic sheet and the third connecting terminal and is normally closed, after the elastic sheet is pressed, the second connecting terminal and the third connecting terminal are disconnected, the load is electrically connected with the first connecting terminal through the third connecting terminal and the elastic sheet, and the third loop is disconnected.

In a fourth aspect, an embodiment of the present invention provides a method for wiring a tact switch, using a tact switch as in the first aspect, including: one path of the load is electrically connected with the first connecting terminal, the other path of the load is electrically connected with the third connecting terminal, the load forms a fourth loop through the first connecting terminal, the elastic sheet and the third connecting terminal and is normally open, after the elastic sheet is pressed, the first connecting terminal is connected with the third connecting terminal, and the fourth loop is closed.

Compared with the related art, the tact switch provided by the embodiment of the invention has the advantages that the protruding part is arranged between the first fixed contact and the second fixed contact on the inner bottom surface of the switch box, the second fixed contact and the third fixed contact which are kept in contact in a normal state are disconnected after the elastic piece is contacted with the protruding part by pressing the elastic piece by the driving body, the third fixed contact is connected with the first fixed contact by the elastic piece, and single-pole double-throw and/or single-pole single throw can be realized by different wiring modes.

The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the invention.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

Fig. 1 is an assembled perspective view of a tact switch in accordance with an embodiment of the present invention.

Fig. 2 is an exploded view of a tact switch in accordance with an embodiment of the present invention.

Fig. 3 is a cross-sectional structural view of a tact switch in accordance with an embodiment of the present invention.

Fig. 4 is a structural diagram of a second metal piece, a third metal piece, and a fourth metal piece of the tact switch according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a wiring method of the tact switch of embodiment 1 of the present invention.

Fig. 6 is a schematic diagram of a wiring method of the tact switch of embodiment 2 of the present invention.

Fig. 7 is a schematic diagram of a wiring method of the tact switch of embodiment 3 of the present invention.

In the figure, 1, a switch box; 2. a spring plate; 3. a driving body; 4. a cover plate; 5. a second metal piece; 6. a third metal piece; 7. a fourth metal piece; 8. a first fixed contact; 9. a second fixed contact; 10. a third fixed contact; 11. a first connection terminal; 12. a second connection terminal; 13. a third connection terminal; 14. a fourth connection terminal; 15. a protruding portion; 16. a first elevation; 17. a second plateau; 18. a center portion; 19. an annular portion; 20. a conical ring portion; 21. a first contact; 22. a second contact; 23. a bridge; 24. a positioning part; 25. a protruding portion; 26. an end face; 27. an extension; 28. a clamping hole; 29. positioning columns; 30. a load; 31. a first loop; 32. a second loop; 33. a third loop; 34. a fourth loop; 35. a convex edge; 36. and a micro-protrusion.

Detailed Description

The present invention will be described and illustrated with reference to the accompanying drawings and examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by a person of ordinary skill in the art based on the embodiments provided by the present invention without making any inventive effort, are intended to fall within the scope of the present invention. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the described embodiments of the invention can be combined with other embodiments without conflict.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "a," "an," "the," and similar referents in the context of the invention are not to be construed as limiting the quantity, but rather as singular or plural. The terms "comprising," "including," "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to only those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in connection with the present invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means greater than or equal to two. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. The terms "first," "second," "third," and the like, as used herein, are merely distinguishing between similar objects and not representing a particular ordering of objects.

As shown in fig. 1-4, the tact switch according to the embodiment of the invention mainly comprises a switch box 1, a spring 2, a driving body 3 and a cover plate 4, wherein the switch box 1 is made of an insulating material and is integrally injection-molded with a second metal piece 5, a third metal piece 6 and a fourth metal piece 7 as conductive media, the spring 2 is made of a metal material which is also used as a conductive media, the driving body 3 is made of an insulating material, and the cover plate 4 can be made of a metal material or a plastic material according to requirements.

As shown in fig. 2 to 3, the switch box 1 of the present embodiment has a first fixed contact 8, a second fixed contact 9 and a third fixed contact 10 on the inner bottom surface, the switch box 1 has a first connection terminal 11, a second connection terminal 12, a third connection terminal 13 and a fourth connection terminal 14 on the outer periphery, the second metal member 5 is integrally formed by the second fixed contact 9 and the second connection terminal 12, the third metal member 6 is integrally formed by the third fixed contact 10 and the third connection terminal 13, and the fourth metal member 7 is integrally formed by the first fixed contact 8, the first connection terminal 11 and the fourth connection terminal 14. A protrusion 15 is arranged on the inner bottom surface of the switch case 1 between the first fixed contact 8 and the second fixed contact 9, the protrusion 15 being higher than the first fixed contact 8, the second fixed contact 9 and the third fixed contact 10, the first fixed contact 8 being lower than the second fixed contact 9 and the third fixed contact 10. A first raised platform 16 and a second raised platform 17 are arranged on the inner bottom surface of the switch box 1, the first raised platform 16 is positioned on one side of the connection line of the second fixed contact 9 and the third fixed contact 10, the second raised platform 17 is positioned on the other side, and the first raised platform 16 and the second raised platform 17 are lower than the height of the second fixed contact 9 and the third fixed contact 10. The first high platform 16, the second high platform 17, the second fixed contact 9 and the third fixed contact 10 are used for supporting the assembly of the elastic sheet 2, so that the transition deviation caused by the overlarge deviation range of the elastic sheet 2 after being pressed can not occur, and the stable reliability of the switch is ensured.

As shown in fig. 2 to 3, the elastic sheet 2 of the present embodiment is in a disc shape as a whole, and has a central portion 18 at the center and an annular portion 19 at the periphery, the central portion 18 being higher than the annular portion 19, and the central portion 18 and the annular portion 19 being joined by a conical ring portion 20. In a normal state, the elastic sheet 2 is not acted by external force, the annular part 19 of the elastic sheet 2 keeps contact with the second fixed contact 9 and the third fixed contact 10, the annular part 19 is contacted with the second fixed contact 9 to form a first contact 21, and the annular part 19 is contacted with the third fixed contact 10 to form a second contact 22. Under the action of external force, the central part 18 of the elastic sheet 2 is pressed and deformed, under the action of the conical ring part 20, before the elastic sheet 2 is pressed and deformed and does not contact the protruding part 15, the first contact 21 and the second contact 22 of the annular part 19 are respectively kept in contact with the second fixed contact 9 and the third fixed contact 10, so that the second fixed contact 9 and the third fixed contact 10 are kept connected through the elastic sheet 2, after the elastic sheet 2 is pressed and deformed and contacts the protruding part 15, in the process that the central part 18 of the elastic sheet 2 continues to be pressed and deformed, the annular part 19 where the first contact 21 is located is tilted by taking the protruding part 15 as a pivot, so that the first contact 21 is disconnected from the second fixed contact 9, namely, the second fixed contact 9 is disconnected from the third fixed contact 10.

In addition, the annular portion 19 of the spring 2 is configured to be in surface contact or line contact with the second fixed contact 9 and the third fixed contact 10, in this embodiment, the contact area is ensured by adopting a surface contact manner, and the protruding portion 15 is located in the vertical projection range of the central portion 18 on the inner bottom surface of the switch box 1. Compared with the first fixed contact 8, the protruding part 15 is closer to the second fixed contact 9, so that the central part 18 has a larger deformation space, and the annular part 19 of the elastic sheet 2 has a better tilting effect.

As shown in fig. 2-3, in the driving body 3 of the present embodiment, the outer periphery of the driving body 3 is connected with a positioning portion 24 through a bridging portion 23, and four directions of the outer periphery of the positioning portion 24 are respectively provided with symmetrical protruding portions 25, so that the position does not need to be adjusted when the driving body is assembled on the switch box 1, and convenience in assembly is improved. The driving body 3, the bridging portion 23 and the positioning portion 24 are made of integrally formed elastic materials, such as insulating materials like silica gel. The positioning portion 24 is erected on an end face 26 of the opening of the switch box 1, and the positioning portion 24 is vertically fixed by the cover plate 4 being fastened with the switch box 1. As shown in the drawing, the cover plate 4 of the present embodiment has a vertical extension portion 27, and the extension portion 27 has a clamping hole 28, and the clamping hole 28 is simultaneously used as a fastening hole fastened with the switch box 1, and the protruding portion 25 at the periphery of the positioning portion 24 is clamped in the clamping hole 28 to horizontally fix the positioning portion 24. The driving body 3 of the present embodiment is not entirely fitted into the switch case 1, but is mounted on the opening end face 26 of the switch case 1 by the positioning portion 24, and the difficulty in mounting and dismounting is effectively reduced. The lower edge of the fastening hole 28 formed on the extension portion 27 is recessed toward the outer wall of the switch box 1, and a micro-protrusion 36 is formed on the inner side, and the micro-protrusion 36 helps to strengthen the fastening effect of the fastening hole on the outer wall of the switch box 1, so that the structural reliability of the switch of the invention is improved.

In addition, a positioning post 29 is disposed on the outer bottom surface of the switch case 1, and the tact switch can be pre-positioned on the PCB board by inserting the positioning post 29 into a positioning hole on the PCB board when being assembled on the PCB board.

The end face 26 of the opening of the switch box 1 is provided with an annular convex edge 35 which surrounds the opening and is higher than the end face 26, and the arrangement of the convex edge 35 enhances the tightness between the switch box and the positioning part 24, thereby improving the waterproof and dustproof performance of the switch.

As shown in fig. 5, in embodiment 1 of the connection method of the tact switch according to the present invention, it is assumed that a load 30 is a load 30, the load 30 may be a chip, a lamp, or the like, one path of the load 30 is electrically connected to the second connection terminal 12, one path is electrically connected to the third connection terminal 13, one path is electrically connected to the first connection terminal 11, the load 30 forms a first loop 31 with the third connection terminal 13 via the second connection terminal 12, the spring 2, and the third connection terminal 12, the load 30 forms a second loop 32 via the third connection terminal 13, the spring 2, and the first connection terminal 11, and the first loop 31 and the second loop 32 are switched by pressing the spring 2. Embodiment 1 realizes a single pole double throw function by switching the first loop 31 and the second loop 32.

As shown in fig. 6-7, on the basis of the same tact switch, single-pole single-throw functions with different functions are realized through different wiring methods. As shown in fig. 6, embodiment 2 of the wiring method of the present invention is specifically: one path of the load 30 is electrically connected with the second connecting terminal 12, one path of the load 30 is electrically connected with the third connecting terminal 13, the load 30 forms a third loop 33 through the second connecting terminal 12, the elastic sheet 2 and the third connecting terminal 13 and is normally closed, after the elastic sheet 2 is pressed, the second connecting terminal 12 and the third connecting terminal 13 are disconnected, the load 30 is electrically connected with the first connecting terminal 11 through the third connecting terminal 13 and the elastic sheet 2, and the third loop 33 is disconnected. And as shown in fig. 7, embodiment 3 of the wiring method of the present invention is specifically: one path of the load 30 is electrically connected with the first connecting terminal 11, one path of the load 30 is electrically connected with the third connecting terminal 13, the load 30 forms a fourth loop 34 through the first connecting terminal 11, the elastic sheet 2 and the third connecting terminal 13 and is normally open, and after the elastic sheet 2 is pressed, the first connecting terminal 11 is connected with the third connecting terminal 13, and the fourth loop 34 is closed. In embodiment 2 and embodiment 3, the third circuit 33 and the fourth circuit 34 are controlled to be turned on or off by pressing the spring 2, so as to realize the function of single pole single throw.

The working principle of the embodiment of the invention is as follows:

Normally, the first fixed contact 8 is not contacted with the elastic sheet 2, and the second fixed contact 9 and the third fixed contact 10 form a passage through the elastic sheet 2; after an external force is applied to the driving body 3 from top to bottom, the driving body 3 moves down in the switch box 1 by means of the positioning part 24 and the bridging part 23, in the downward moving process, the bottom surface of the driving body 3 extrudes the central part 18 of the elastic sheet 2, the central part 18 of the elastic sheet 2 deforms downwards after being extruded, in the continuous deforming process, the bottom surface of the elastic sheet 2 contacts the protruding part 15 on the inner bottom surface of the switch box 1, then the elastic sheet 2 takes the protruding part 15 as a fulcrum, the annular part 19 of the elastic sheet 2 is tilted, the first contact 21 of the tilted annular part 19 is disconnected from the second fixed contact 9, then the disconnection between the second fixed contact 9 and the third fixed contact 10 is realized, meanwhile, the central part 18 of the elastic sheet 2 deforms to be contacted with the first fixed contact 8, and the first fixed contact 8 forms a passage with the third fixed contact 10 through the elastic sheet 2.

It should be understood by those skilled in the art that the technical features of the above-described embodiments may be combined in any manner, and for brevity, all of the possible combinations of the technical features of the above-described embodiments are not described, however, they should be considered as being within the scope of the description provided herein, as long as there is no contradiction between the combinations of the technical features.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A tact switch, comprising:

A switch box (1) with an opening is arranged on the upper surface;

A first fixed contact (8) formed at the center of the inner bottom surface of the switch case (1);

A second fixed contact (9) and a third fixed contact (10) formed on the inner bottom surface of the switch case (1) and sandwiching the first fixed contact (8);

A first connection terminal (11), a second connection terminal (12), and a third connection terminal (13) electrically connected to the first fixed contact (8), the second fixed contact (9), and the third fixed contact (10), respectively, at the outer periphery of the switch case (1);

a protrusion (15) formed on the inner bottom surface of the switch case (1) and located between the first fixed contact (8) and the second fixed contact (9);

A spring plate (2) which is in contact with the second fixed contact (9) and the third fixed contact (10) in the switch box (1) under the action of no external force, wherein the spring plate (2) is provided with a first contact (21) which is in contact with the second fixed contact (9) and a second contact (22) which is in contact with the third fixed contact (10); and

A driving body (3) for pressing the elastic sheet (2), wherein the driving body (3) is arranged above the elastic sheet (2) in a manner of being capable of moving up and down;

The driving body (3) descends to press the elastic sheet (2) after being acted by external force, the center of the elastic sheet (2) is pressed and is locally deformed to be contacted with the first fixed contact (8), the elastic sheet (2) is contacted with the protruding part (15) in the process of locally deforming, and the protruding part (15) is taken as a branch point to lift the first contact (21) so as to release the contact state of the first contact (21) and the second fixed contact (9).

2. A tact switch according to claim 1, characterized in that the first fixed contact (8) is a first metal piece integrally formed with the first connection terminal (11), the second fixed contact (9) is a second metal piece (5) integrally formed with the second connection terminal (12), and the third fixed contact (10) is a third metal piece (6) integrally formed with the third connection terminal (13).

3. A tact switch according to claim 2, characterized in that a fourth connection terminal (14) is arranged on the outer periphery of the switch box (1), the fourth connection terminal (14) being a fourth metal piece (7) formed integrally with the first metal piece.

4. A tact switch according to claim 3, characterized in that the second metal part (5), the third metal part (6) and the fourth metal part (7) are injection molded integrally with the switch box (1).

5. A tact switch according to claim 1, characterized in that the spring (2) has a central part (18) in the centre and a peripheral ring part (19), the central part (18) being higher than the ring part (19), the central part (18) and the ring part (19) being joined by means of a conical ring part (20).

6. A tact switch according to claim 5, characterized in that the protrusion (15) is higher than the first (8), second (9) and third (10) fixed contacts, the first fixed contact (8) being lower than the second (9) and third (10) fixed contacts.

7. A tact switch according to claim 1, characterized in that the periphery of the driving body (3) is connected with a positioning part (24) through a bridging part (23), the positioning part (24) is erected on the end face (26) of the opening of the switch box (1), the positioning part (24) is vertically fixed by buckling a cover plate (4) with the switch box (1), the cover plate (4) is provided with a vertical extension part (27), the extension part (27) is provided with a clamping hole (28), and a protruding part (25) on the periphery of the positioning part (24) is clamped in the clamping hole (28) so as to horizontally fix the positioning part (24).

8. A method of wiring a tact switch, characterized in that a tact switch according to any one of claims 1-7 is used, comprising: one path of load (30) with second connecting terminal (12) electricity is connected, one path with third connecting terminal (13) electricity is connected, one path with first connecting terminal (11) electricity is connected, load (30) constitute first return circuit (31) through second connecting terminal (12), shell fragment (2) and third connecting terminal (13), load (30) constitute second return circuit (32) through third connecting terminal (13), shell fragment (2) and first connecting terminal (11), through pressing shell fragment (2) switch first return circuit (31) and second return circuit (32).

9. A method of wiring a tact switch, characterized in that a tact switch according to any one of claims 1-7 is used, comprising: one path of load (30) with second connecting terminal (12) electricity is connected, one path with third connecting terminal (13) electricity is connected, load (30) constitute third return circuit (33) and normal close through second connecting terminal (12), shell fragment (2) and third connecting terminal (13), press behind shell fragment (2), second connecting terminal (12) and third connecting terminal (13) disconnection, load (30) are connected with first connecting terminal (11) electricity through third connecting terminal (13), shell fragment (2), third return circuit (33) disconnection.

10. A method of wiring a tact switch, characterized in that a tact switch according to any one of claims 1-7 is used, comprising: one path of load (30) is electrically connected with the first connecting terminal (11), one path of load is electrically connected with the third connecting terminal (13), the load (30) forms a fourth loop (34) through the first connecting terminal (11), the elastic sheet (2) and the third connecting terminal (13) and is normally open, after the elastic sheet (2) is pressed, the first connecting terminal (11) is connected with the third connecting terminal (13), and the fourth loop (34) is closed.