TWM629791U - Improved structure of microswitch - Google Patents

Abstract

An improved structure of a micro switch, comprising: a switch seat, which includes a seat, A accommodating space is arranged in the base body, and a circuit pin group is arranged in the base body, and the circuit pin group has an electrode contact portion and a plurality of welding pins protruding from the base body; a cover body, which is provided with a cover body a through hole; a metal shrapnel embedded in the accommodating space; a shielding cover gasket integrally assembled between the seat body and the cover body, the shielding cover gasket is provided with a shielding pad through hole, the shielding cover The bottom edge of the gasket has a folding portion extending toward the seat body, and the folding portion covers the bottom edge of the seat body. A metal shrapnel, the other end of the button push handle protrudes out of the base through the cover through hole and the cover through hole, and the metal shrapnel is linked with the electrode by pressing the button push handle. The contact part is in electrical contact conduction; in this way, it can solve the problem that the vaporized flux of the solder melted tin escapes into the inside of the switch along the tiny gap during the welding and positioning process of the micro switch.

Description

Micro switch improved structure

This creation is about a micro switch, especially an improved structure of the micro switch that prevents flux from entering the switch and causing poor product operation.

The current micro switch is a commonly used circuit switch mechanism, which is widely used in industry, electronics, machinery, metallurgy, electric power and other fields. or protection function.

As shown in FIG. 1, the micro switch 90 includes a switch base 91 and a cover 92. The switch base 91 is provided with a contact piece 93 and a plurality of circuit pins 94. The contact piece 93 The rear (in the direction shown in Figure 1, the same below) is provided with a phase-separated metal dome (Dome) 95. The contact piece 93 and the metal dome 95 are respectively connected with the circuit of the corresponding polarity of the plurality of circuit pins 94. , and each circuit pin 94 is inserted into the corresponding pin socket 101 of a circuit board 100 for soldering and fixing, and a soldering connection 98 is formed. The cover body 92 is provided with a stem 96 , and a push portion 961 is arranged in front of the push handle 96 . The push portion 961 is in contact with the metal elastic piece 95 , and a support leg 921 extends from the cover body 92 . The support pins 921 are inserted into the corresponding support pin sockets 102 of the circuit board 100 to be welded and fixed, and form a welding fixing portion 98 . When the push handle 96 is pressed, the push portion 961 pushes the metal elastic piece 95 forward, and elastically deforms the metal elastic piece 95 to contact the contact piece 93 for electrical conduction, that is, in a state of electrical conduction. When the push handle 96 is released, the push portion 961 releases the pressing force on the metal dome 95, and causes the metal dome 95 to push the push portion 961 (push handle 96) backwards according to its own elastic restoring force, and makes the metal dome 95 and the contact piece 93 come into contact again. The state of separation and no contact is the power-off state.

Although the aforementioned conventional microswitch 90 technology can achieve the touch effect of turning on or off the circuit by pressing and releasing the push handle 96, it still has its shortcomings. For example, there is a small gap 97 between the switch base 91 and the cover 92 of the micro switch 90. After the switch base 91 and the cover 92 are riveted and assembled, the plurality of circuit pins 94 and 921 are The circuit board 100 is positioned on the circuit board 100 by the DIP (Dual In Line Package Process) soldering process, so that the flux (Flux) in the molten tin during the soldering process will generate vapors 981, and the vapors 981 follow the The gap 97 penetrates into the micro switch 90, and after condensing, it will solidify to form a solidified substance 982 between the inside of the cover 92 and the push handle 96, which will cause the push handle 96 to operate unsmoothly/badly, and even lead to The phenomenon of stuck key, showing the non-ideal structural design.

For this reason, in view of the lack of use of the existing micro switch technology and the fact that the structural design is not ideal, the creator of this case started to develop its solution, hoping to develop a more pressing operation smoother and better. The improved structure of the micro switch with the best quality and effect, in order to serve the public and promote the development of this industry, has been conceived for a long time and this creation has been produced.

The purpose of this creation is to provide an improved structure for the micro switch, which can solve the problem of the lack of vaporized flux from the solder melted tin into the switch along the tiny gap during the welding positioning process of the micro switch, so as to ensure the pressing operation of the micro switch. smoothness and better product quality.

Another object of the present invention is to provide an improved structure for a micro switch, which can be formed by adding a shield to prevent flux vapor from rising up between the switch base and the cover, so as to effectively The effect of suppressing flux vapors from escaping into the micro switch from tiny gaps is achieved.

The technical means adopted by the improved structure of the micro-switch of the present invention to achieve the above-mentioned purpose includes: a switch base body, which includes a base body, the base body is provided with an accommodating space, and the base body is provided with a circuit pin group, the circuit The pin set has an electrode contact portion and a plurality of welding pins protruding from the base body; a cover body, which is provided with a cover body through hole; a metal elastic piece embedded in the accommodating space; a shielding cover gasket, The one-piece assembly is fixed between the seat body and the cover body, the shielding cover gasket is provided with a shielding pad through hole, and the bottom edge of the shielding cover gasket has a folding portion extending toward the seat body. The folding portion The cover is arranged on the bottom edge of the seat body; a push button handle, one end of which is arranged in the space for pressing the metal elastic sheet, the other end of the push button push handle passes through the through hole of the cover, and the cover body passes through The hole protrudes out of the base, and the push-button push handle is pressed to link the metal elastic piece, so that the metal elastic piece and the electrode contact portion are electrically contacted and conducted.

In this embodiment, the base body is provided with a plurality of riveting posts protruding backwards around the accommodating space, and a plurality of riveting holes corresponding to the riveting posts are provided around the through hole of the cover body, and the cover is through A plurality of riveting holes corresponding to the riveting posts are arranged around the holes, and the riveting posts and the riveting holes are riveted and consolidated.

In this embodiment, the circuit pin group includes a first circuit pin and a second circuit pin that are separated and not connected, the first circuit pin is in contact with the metal elastic sheet, and the second circuit pin is in contact with the metal spring. The electrode contact portion is formed on the circuit pin, and both the first circuit pin and the second circuit pin respectively have the soldering pin protruding from the base.

In this embodiment, the soldering pins are inserted into corresponding pin sockets on a circuit board.

In this embodiment, the soldering pins are set with horizontal soldering pins Set up for Surface Solder Mount Technology (SMT).

In this embodiment, the cover body has at least one support pin protruding downward from the base body, and the support pin is inserted into the corresponding support pin socket on the circuit board.

In this embodiment, a side cover portion extends backward from the side of the cover body, a buckling piece is arranged above the side cover portion, and the side cover portion is provided with at least one supporting leg protruding downward.

In this embodiment, the metal elastic sheet has a central portion of the elastic sheet and a peripheral portion of the elastic sheet, and the first circuit pin has at least one pin contact portion, and the pin contact portion is in contact with the peripheral portion of the elastic sheet.

In this embodiment, the button push handle is provided with a button head with a larger diameter and a width and a button pusher with a smaller diameter and width, the button head is arranged in the accommodating space, and the front end of the button head The protrusion is provided with a pushing portion with the smallest diameter and width, and the pushing portion abuts against the central portion of the elastic piece.

In this embodiment, a missing space is provided in the push button handle, and a pushing portion protrudes from the missing space toward the metal elastic sheet, and the pushing portion abuts against the central portion of the elastic sheet.

In this embodiment, the bottom edge of the base body is provided with a groove, and the groove is used for embedding and accommodating the folding portion.

1. 1A: Micro switch

10: switch seat

11: seat body

111: Groove

12: Accommodating space

13: Riveted post

13A: Riveting Consolidation

14: circuit pin group

14a: The first circuit pin

14b: Second circuit pin

140: pin contact part

141: Soldering feet

143: Electrode Contacts

15: Electrode contact position

16: Gap

20: Cover

21: Riveting holes

22: Cover through hole

23: Support feet

24: Side cover

241: Support feet

242: Buckle

30: Metal shrapnel

30A: The central part of the shrapnel

30B: The peripheral part of the shrapnel

40: Button push handle

41: Button head

42: Pushing Department

43: Button pusher

44: Missing space

50: Masking cover gasket

51: Folding part

52: Riveting hole

53: Pad through hole

60: circuit board

61: pin jack

62: Support foot jack

63: Welding consolidation part

631: Vapor

FIG. 1 is a schematic structural diagram of the prior art.

FIG. 2 is a three-dimensional schematic diagram of the first embodiment of the present invention.

Fig. 3 is an exploded schematic diagram of the first embodiment of the present invention.

FIG. 4A is a schematic cross-sectional view of the first embodiment of the present invention.

Fig. 4B is a schematic cross-sectional view taken along line A-A of Fig. 4A.

FIG. 5 is a schematic cross-sectional view of the welding operation of the first embodiment of the present invention.

FIG. 6 is a three-dimensional schematic diagram of the second embodiment of the present invention.

FIG. 7 is an exploded schematic diagram of the second embodiment of the present invention.

FIG. 7A is a schematic diagram of the rear view of the base of the second embodiment of the present invention.

Please refer to Figures 2, 3 and 4A, 4B to illustrate the first embodiment of the improved structure of the micro switch of the present invention. The micro switch 1 includes: a switch base 10, a cover 20, a metal spring 30, a The button push handle 40 and a cover gasket 50; the switch base 10 includes a base 11, the base 11 is provided with an accommodating space 12, the base 11 is provided with a plurality of backwards around the accommodating space 12 The protruding riveting post 13, the base body 11 is provided with a circuit pin group 14 and an electrode contact position 15, the circuit pin group 14 includes a first circuit pin 14a and a second circuit pin 14a which are separated and unconducted The circuit pin 14b, wherein the first circuit pin 14a has a pin contact portion 140 separated on both sides, and the structure of the two pin contact portions 140 (the first circuit pin 14a) can just be located at the electrode contact position 15 On both sides of the second circuit pin 14b, the second circuit pin 14b is located at a downwardly extending position from the electrode contact position 15, an electrode contact portion 143 is formed above the second circuit pin 14b, and the electrode contact portion 143 is disposed on the The electrode contacts the position 15, and the shape, composition and arrangement position of the first circuit pin 14a and the second circuit pin 14b are not limited.

As shown in FIG. 4A , the first circuit pin 14a and the second circuit pin 14b (circuit pin group 14 ) have soldering pins 141 protruding downward from the base 11 , respectively. These circuit pins The soldering pins 141 of the group 14 are inserted into the corresponding pin sockets 61 of a circuit board 60 to form the setting of circuit conduction, so that the electrode contact position 15 and the circuit board 60 form the main part of the micro switch 1 Operation, control composition.

The cover body 20 is a metal cover body, a cover body through hole 22 is formed in the center of the cover body 20 , and a plurality of riveting holes 21 corresponding to the riveting column 13 are arranged around the cover body through hole 22 . 20 has at least one support pin 23 protruding downward from the base body 11. As shown in FIG. 4A, the support pin 23 is inserted into the corresponding support pin socket 62 of the circuit board 60 to provide the micro-movement The switch 1 is securely positioned on the circuit board 60 .

The metal elastic piece 30 is embedded in the accommodating space 12 of the base body 11 , and the metal elastic piece 30 has an arc edge surface. It has the elastic function of pressing, deforming and restoring; the metal elastic piece 30 has a central part 30A of the elastic piece and a peripheral part 30B of the elastic piece, and the peripheral part 30B of the elastic piece can just correspond to the pin contact parts on both sides of the first circuit pin 14a 140.

The button push handle 40 is provided with a button head portion 41 with a larger diameter and a width and a button push portion 43 with a smaller diameter and width. The button head portion 41 is disposed in the accommodating space 12 of the base body 11 . In an appropriate implementation In the method, the front end of the button head 41 protrudes with a pushing portion 42 with a smaller diameter and width, and the pushing portion 42 abuts against the central portion 30A of the elastic piece at the arc convex portion at the rear end of the metal elastic piece 30 , and the The arc concave portion at the front end of the metal dome 30 corresponds to the electrode contact portion 143 (electrode contact position 15 ).

The shielding cover gasket 50 abuts on the base body 11 at the front, and abuts on the cover body 20 at the rear. The center part of the gasket 50 is provided with a mask through hole 53, and a plurality of riveting holes 52 corresponding to the riveting post 13 are arranged around the mask through hole 53. The bottom edge of the mask gasket 50 has a front end (toward The folding portion 51 extends vertically in the direction of the seat body 11 . In a suitable embodiment, as shown in FIG. 4A , a groove 111 is formed on the bottom edge of the base body 11 for embedding and accommodating the folding portion 51 .

In the aforementioned structure, there is a gap 16 between the cover body 20 and the base body 11 , and the cover gasket 50 is located at the position of the gap 16 , and is embedded in the base body 11 by the folding portion 51 . The groove 111 on the bottom edge can achieve the best effect of shielding the gap 16 from being affected by the welding operation.

In the combination of the first embodiment of the improved structure of the micro-switch of the present invention, the metal shrapnel 30 and the button head 41 of the button push handle 40 are arranged in the accommodating space 12 of the base body 11 , and the button pusher of the button push handle 40 is The part 43 passes through the cover through hole 53 of the cover gasket 50 and the cover through hole 22 of the cover body 20 successively backwards, so that the button head 41 is restrictedly located in the accommodating space 12 to prevent It protrudes out of the base body 11 backwards. Furthermore, the plurality of riveting posts 13 of the base body 11 pass through the riveting holes 52 of the cover gasket 50 and the riveting holes 21 of the cover body 20 successively for riveting and fixing, and form a plurality of riveting joints on the cover body 20 The microswitch 1 is formed by consolidating 13A and assembling.

After the micro switch 1 is assembled on the circuit board 60 , when the push button handle 40 is pressed, the pushing portion 42 will push the metal elastic piece 30 forward together, and elastically deform the metal elastic piece 30 to connect with the electrode The contact parts 143 are in contact with each other, and are then electrically conductive, that is, the microswitch 1 is in an electrically conductive state. When the button push handle 40 is released, the pushing portion 42 releases the pressing force on the metal elastic piece 30 , and the metal elastic sheet 30 pushes the pushing portion 42 (the push button push handle 40 ) backward according to its own elastic restoring force Push, and make the metal dome 30 and the electrode contact portion 143 be separated and not in contact again, which is the power-off state of the micro switch 1 .

Please also refer to FIG. 5 to illustrate the state of the first embodiment of the improved microswitch structure of the present invention in which the soldering assembly is fixed to the circuit board 60 . For example, the DIP (Dual In Line Package Process) soldering process is used. When the solder pins 141 of the group 14 (the first circuit pin 14a, the second circuit pin 14b) and the support pins 23 of the cover 20 are soldered to the circuit board 60, they will be The bottom edges of the pin sockets 61 and the support pin sockets 62 form a welding solid portion 63, and a vapor 631 as shown in FIG. 5 is generated during the welding operation. The vapor 631 is formed during the welding process. Formed by the flux (Flux) in the molten tin, although the vapor 631 will rise from bottom to top, but it is blocked by the folded portion 51 (shielding gasket 50 ), so that the vapor 631 cannot follow The original gap 16 enters the adjacent area between the inner side of the cover body 20 and the base body 11, so as to avoid the phenomenon of loss caused by the condensation and solidification of the vapor 631, so as to ensure the smooth operation of the button push handle 40, such as no It will lead to the phenomenon of stuck keys, so as to ensure the production yield and the quality of operation and use of the micro switch 1 .

Please refer to Figures 6, 7, and 7A to illustrate the second embodiment of the improved structure of the micro switch of the present invention. This embodiment is based on the structure of the first embodiment and is designed by transformation. The difference lies in: the micro switch 1A The circuit pin group 14 disposed in the base body 11 is provided with a horizontal soldering pin 141 for performing the surface soldering and adhesion technology operation (SMT) of the tin furnace; the button push handle 40 is provided with a missing There is a space 44, and a pushing portion 42 protrudes from the missing space 44 toward the metal dome 30. The pushing portion 42 also provides a pressing operation against the metal dome 30; both sides of the cover body 20 extend backward respectively There is a side cover portion 24, a buckle piece 242 is arranged above the side cover portion 24, so that the cover body 20 can properly shield and cover the base body 11, and the side cover portion 24 is provided with at least one downwardly protruding protrusion. Supporting feet 241, the supporting feet 23, 241 are inserted into the corresponding supporting pin sockets on the circuit board to provide stable positioning of the micro switch 1A on the circuit board.

The improved structure of the micro switch of the present invention can solve the problem that the vaporized flux of the molten tin escapes into the inside of the switch along the tiny gap during the welding positioning process of the micro switch, so as to ensure the smoothness of the pressing operation of the micro switch. and better product quality; at the same time, this creation can prevent the flux vapor from rising up by adding a shielding structure between the switch base and the cover. It is used to effectively prevent the flux vapor from escaping into the micro switch from the tiny gap.

The present invention has been described in more detail through the above preferred specific embodiments, but the present invention is not limited to the above-mentioned examples, and within the scope of the technical idea disclosed in the present invention, various changes and modifications to these structures are still possible. It is within the scope of this creation.

1: Micro switch

10: switch seat

11: seat body

13A: Riveting Consolidation

14: circuit pin group

14a: The first circuit pin

14b: Second circuit pin

20: Cover

23: Support feet

40: Button push handle

50: Masking cover gasket

Claims (11)

An improved structure of a micro switch, comprising: A switch base includes a base, the base is provided with an accommodating space, the base is provided with a circuit pin group, the circuit pin group has an electrode contact portion and a plurality of welding protruding from the base foot; a cover body, which is provided with a cover body through hole; a metal shrapnel embedded in the accommodating space; A cover gasket is integrally assembled between the base body and the cover body, the cover gasket is provided with a cover through hole, and the bottom edge of the cover gasket has a folding block extending toward the base body part, the folded part covers the bottom edge of the base body; A button push handle, one end of which is set in the space to press against the metal dome, and the other end of the button push handle protrudes out of the seat through the through hole of the cover pad and the through hole of the cover body, and By pressing the button push handle, the metal elastic sheet is linked, so that the metal elastic sheet and the electrode contact part are electrically contacted and conducted. The improved structure of the micro switch according to claim 1, wherein the base body is provided with a plurality of riveting posts projecting backwards around the accommodating space, and a plurality of riveting posts corresponding to the riveting posts are provided around the through hole of the cover body A plurality of riveting holes corresponding to the riveting posts are arranged around the through hole of the masking pad, and the riveting posts and the riveting holes are riveted and consolidated. The improved structure of the micro switch as claimed in claim 1, wherein the circuit pin group includes a first circuit pin and a second circuit pin that are separated and not connected, and the first circuit pin is in contact with the metal elastic sheet The second circuit pin is formed with the electrode contact portion, and the first circuit pin and the second circuit pin are respectively provided with the soldering pin protruding from the base body. The improved structure of the micro switch as claimed in claim 3, wherein the soldering pins are inserted into corresponding pin sockets on a circuit board. The improved structure of the microswitch as claimed in claim 4, wherein the soldering pins are arranged with soldering pins having a horizontal shape for performing surface soldering and sticking technology operation (SMT). The improved structure of the micro switch as claimed in claim 4, wherein the cover body has at least one supporting leg protruding downward from the base body, and the supporting leg is inserted into the corresponding supporting leg socket on the circuit board. The improved structure of the micro switch as claimed in claim 1, wherein a side cover portion extends backward from the side of the cover body, a clasp is arranged above the side cover portion, and the side cover portion is provided with at least one supporting leg protruding downward. . The improved structure of the micro switch as claimed in claim 3, wherein the metal elastic piece has a central part of the elastic piece and a peripheral part of the elastic piece, the first circuit pin has at least one pin contact part, and the pin contact part abuts against the peripheral part of the elastic piece catch. The improved structure of the micro switch as claimed in claim 8, wherein the button push handle is provided with a button head with a larger diameter and width and a button pusher with a smaller diameter and width, and the button head is arranged in the accommodating space, A pushing portion with the smallest diameter and width protrudes from the front end of the button head, and the pushing portion abuts against the central portion of the elastic piece. The improved structure of the micro switch as claimed in claim 8, wherein a missing space is provided in the push button handle, and a pushing portion protrudes from the missing space toward the metal elastic piece, and the pushing portion abuts against the center of the elastic piece part. The improved structure of the micro-switch as claimed in claim 1, wherein a bottom edge of the base body is provided with a groove, and the groove is used for embedding and accommodating the folding portion.

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