A push button switch

Abstract

A pushbutton switch includes an upper housing, a lower housing, a button, a conductive sheet, and contact pins. The conductive sheet is connected to the button and is powered on and off by the downward / upward movement of the button. The outer wall of the conductive sheet extending beyond the button is provided with multiple contact sheets corresponding to the multiple contact pins on the same side. The inner wall of the upper end of the contact pin is provided with an inwardly extending contacted sheet. When powered on, the contact sheet contacts the contacted sheet and generates a force that causes the contact sheet to bend inward. When powered off, the contact sheet does not contact the contacted sheet and is located within a gap defined by the width difference between the contact pin and the contacted sheet. The contact portion of the conductive sheet of the present invention adopts an arc-shaped configuration, which allows the contact portion to bend inherently. This allows the contact portion to remain in a bent state regardless of deformation caused by the extrusion force generated by contact with the contacted sheet or by the influence of current, thereby ensuring power supply stability.

Description

Technical Field

[0001] The present invention relates to the technical field of switches, in particular to a key switch. Background Art

[0002] Currently, pushbutton switches operate by applying pressure in the direction of the switch's operating force to close the switch. Removing the pressure disconnects the switch. The internal structure relies on the force applied to a metal dome to achieve on-off switching. The metal domes in pushbutton switches are thin sheets. Long-term exposure to electrical current can cause the section where they contact the contact pins to warp. This warping shortens the metal dome, preventing it from contacting the contact pins. This can cause the pushbutton switch to malfunction, shortening its service life. Summary of the Invention

[0003] The present invention aims to solve the above-mentioned shortcomings of the prior art and provides a key switch to solve the above-mentioned problems.

[0004] The present invention adopts a technical solution to solve its technical problems: this push button switch includes an upper shell, a lower shell, a button, a conductive sheet, and a contact pin. The conductive sheet is connected to the button and realizes power off / on by moving the button downward / upward. The outer side wall of the conductive sheet extending outside the button is provided with multiple contact sheets corresponding to the multiple contact pins on the same side. The inner side wall of the upper end of the contact pin is provided with a contacted sheet extending inward. The contact sheet contacts the contacted sheet in the power-on state and generates a force that causes the contact sheet to bend inward when in contact. In the power-off state, the contact sheet does not contact the contacted sheet and is located in a gap with a width difference formed between the contact pin and the contacted sheet. The principle of the present invention is that the contact piece bends when subjected to force, so that the contact piece has the elastic deformation ability to reset itself. It is also by utilizing this ability that the contact piece can generate a resistance force to reset itself when bending, that is, to restore its original shape outward. By utilizing this resistance force to restore the original shape outward, the contact piece can increase the contact tightness with the contacted piece, thereby ensuring the timely contact between the contact piece and the contacted piece and the stability in the power-on state, and will not have the defect of length shortening when bending. At the same time, a single conductive piece has two contact pieces and can contact two contact feet at one time, which simplifies the structure.

[0005] Further improvement, the contact piece has an extension part and two contact parts, the extension part is integrally formed on the outer side wall of the conductive piece and is inclined from the inside to the outside, the two contact parts are integrally formed on the extension part and are symmetrically distributed front to back, and the contact part has a lower end, an upper end and a connecting section connecting the two, the lower end is connected to the extension part, the upper end is located on the upper inner side of the lower end, the connecting section has a rectangular cross-section extending from the lower end to the upper end, and the extension trajectory is a clockwise arc, and there are multiple places in contact with the contacted piece. The arc-shaped configuration allows the contact portion to always remain in a bent state, and it is not bent due to the influence of current. This will not affect the usable length of the contact piece, and it has elastic deformation ability. Moreover, the contact position with the contacted piece can be multiple, so that if one of the contact points cannot contact the contacted piece, the other contact points can be used to achieve contact and power supply between the two. At the same time, the extension portion is tilted from the inside to the outside so that when the contact portion contacts the contacted piece, the extension portion will swing inward. After swinging, the extension portion will generate a force to reset itself, so that the contact tightness between the contact portion and the contacted piece is further increased under the blocking effect of the contacted piece.

[0006] A further improvement is the inwardly recessed groove at the bottom of the connecting section, which forms an outwardly protruding spring on the top of the connecting section. This spring contacts the contacted piece. This serves two purposes: one is to increase the overall thickness of the connecting section, making it easier to contact the contacted piece and generating significant friction between the connecting section and the contacted piece when the connecting section moves upward; the other is to increase structural strength, preventing the contact portion from deforming due to the influence of current.

[0007] Further improvements have been made to the contacted piece, which has a first contacted portion and a second contacted portion. The first contacted portion is integrally formed on the inner side wall of the contact pin, and the second contacted portion is integrally formed on the upper end of the first contacted portion and extends toward the contact piece. Both the first contacted portion and the second contacted portion are in contact with the spring. This has two functions: on the one hand, the first contacted portion and the second contacted portion create two contact points with the contact piece; on the other hand, it creates a width gap between the contacted piece and the contact pin. This width gap allows the contact piece to disengage when the button moves downward, that is, it no longer contacts the contact pin, thereby disconnecting the power supply.

[0008] Further improvements are made, with first notches centrally located on the front and rear end surfaces of the upper shell. A first plug-in block extending downward and protruding outward is located in the middle of the upper shell. A latch that mates with the first plug-in block is located centrally on the front and rear end surfaces of the lower shell. A first insertion structure extending downward and penetrating the latch is located in the middle of the latch. The first plug-in block is inserted into the first insertion structure, and the latch acts on the first notch during insertion. This ensures the stability of the upper and lower shells after assembly, and the method is simple: simply insert the first plug-in block into the first insertion structure. The latch then engages the first notch, allowing the upper and lower shells to form a single unit after assembly.

[0009] Further improvements are made, with second notches centered on the front and rear end surfaces of the lower shell. The bracket includes two connecting rods and two connecting blocks for connecting the two connecting rods. The connecting rods are vertically fixed to the corresponding inner side walls of the second notches and extend above the outside of the second notches. The two connecting blocks are respectively located at the upper and lower ends of the connecting rods. The spacing between the two connecting blocks serves as a first insertion structure for the first insertion block to be inserted therein. The outer side walls of the connecting blocks are coplanar with the outer side walls of the connecting rods, and the inner side walls of the connecting blocks are inclined from the inner bottom to the outer top. This not only forms the first insertion structure, but also provides the bracket with improved overall structural strength, capable of withstanding the forces applied when the upper and lower shells are disassembled. It also facilitates the rapid insertion of the first insertion block into the first insertion structure while the bracket is moving.

[0010] Further improvements have been made to the upper shell, featuring two U-shaped, symmetrically spaced thickened sections within the interior. These sections extend to the lower end of the upper shell, and a second plug-in block, connected to the first plug-in block, is located between the upper shell and the upper shell. The second plug-in block is inserted into a second insertion structure formed by the inclined surface of the connecting block. The thickened sections enhance the structural strength of the upper shell, increasing overall strength when assembled with the lower shell. The second plug-in block, inserted into the second insertion structure, further enhances the stability of the upper and lower shell assembly.

[0011] Further improvements are made by spacing the two thickened sections apart to form a third insertion structure in the upper shell. A filling section is provided at the corresponding position of the lower shell, allowing the two thickened sections to squeeze and fill the gap when the lower shell enters the third insertion structure. This improves the structural stability of the upper and lower shells after assembly, ensuring they will not separate if dropped or otherwise impacted.

[0012] As a further improvement, channels for the common contact pins are opened at four right-angle positions inside the lower shell, which facilitates the contact pins to extend outside the lower shell and thus achieve connection with other parts.

[0013] As a further improvement, a positioning rod is fixed in the center of the lower housing. A spring is mounted on the rod, and the upper end of the spring is positioned within the button. The spring's elasticity prevents the button from moving downward without external force, thereby ensuring stable and continuous power flow.

[0014] The beneficial effects of the present invention are:

[0015] (1) The conductive sheet of the present invention can contact the two contact pins simultaneously through the two contact parts, and the contact parts adopt an arc-shaped configuration, so that the contact parts themselves are in a curled state. This configuration allows the contact parts to maintain the curled state regardless of the deformation caused by the extrusion force generated by the contact with the contacted sheet or the deformation caused by the current. The characteristic of the arc shape is that the outer peripheral surface of the connecting section always has a commanding height. The commanding height will change due to the change of the arc, but it can always maintain contact with the contacted sheet, thereby ensuring the stability of the power supply and allowing the contact part to have elastic deformation ability;

[0016] (2) The top surface of the connecting section of the present invention forms an outwardly protruding spring sheet, which can increase the thickness of the connecting section. The thickness can increase the tightness of the connecting section when it acts on the contacted sheet, and the bending direction of the connecting section is limited, that is, it can only bend along the arc trajectory of the connecting section;

[0017] (3) The stability of the upper shell and the lower shell after assembly of the present invention is achieved by the latch and the first plug-in block, and the outer wall of the first plug-in block is an inclined surface. This arrangement makes the volume of the first plug-in block only half the volume of the first insertion structure. The inner wall of the connecting block of the latch is also an inclined surface. In this way, there will be no interference that prevents the latch from moving, and the latch can be slightly swung outward during the movement, so that the first plug-in block can be smoothly inserted into the latch.

[0018] (4) The upper shell and the lower shell of the present invention are connected firmly by the second snap-fit ​​structure and the second plug-in block. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the explosion structure of the present invention;

[0020] Figure 2 This is a schematic structural diagram of the conductive sheet and contact pins of the present invention;

[0021] Figure 3 Schematic diagram of the structure of the conductive sheet of the present invention;

[0022] Figure 4 Schematic diagram of the structure of the contact pin of the present invention;

[0023] Figure 5 It is a schematic diagram of the full cross-section structure of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the upper shell of the present invention;

[0025] Figure 7 It is a structural schematic diagram of the lower shell of the present invention;

[0026] Figure 8 It is a schematic structural diagram of the present invention as a whole. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings:

[0028] Referring to the accompanying drawings: This push button switch includes an upper shell 1, a lower shell 2, a button 3, a conductive sheet 4, and a contact foot 5. The conductive sheet 4 is connected to the button 3 and the power is turned off / on by moving the button 3 downward / upward. The outer side wall of the conductive sheet 4 extending to the outside of the button 3 is provided with multiple contact sheets 41 corresponding to the multiple contact feet 5 on the same side. The inner side wall of the upper end of the contact foot 5 is provided with a contacted sheet 51 extending inward. The contact sheet 41 contacts the contacted sheet 51 in the energized state, and generates a force that causes the contact sheet 41 to bend inward when in contact. The contact sheet 41 does not contact the contacted sheet 51 in the de-energized state and is located in the gap of the width difference formed between the contact foot 5 and the contacted sheet 51. When power is connected, the button 3 is pressed to make the contact piece 41 contact the contact foot 5. The pressing slider 3 and the conductive piece 4 are integrally formed. The contact piece 41 bends when subjected to force, so that the contact piece 41 has the elastic deformation ability to reset itself. It is also by utilizing this ability that the contact piece 41 can generate a resistance force to reset itself when bending, that is, to restore to its original shape outward. This resistance force to restore to its original shape outward enables the contact piece 41 to increase its contact tightness with the contacted piece 51, thereby ensuring the timeliness of the contact between the contact piece 41 and the contacted piece 51 and the stability in the power-on state, and the contact piece 41 will not be shortened in length. At the same time, the single conductive piece 4 has two contact pieces 41, which can contact the two contact feet 5 at one time, and the contact foot 5 is also integrally formed with the upper shell 2, which simplifies the structure and ensures the stability of the contact foot 5.

[0029] As for the contact piece 41, the contact piece 41 has an extension portion 41-a and two contact portions 41-b. The extension portion 41-a is integrally formed on the outer wall of the conductive piece 4 and is inclined from the inner bottom to the outer top. The two contact portions 41-b are integrally formed on the extension portion 41-a and are symmetrically distributed front to back. The contact portion 41-b has a lower end 41-b1, an upper end 41-b2 and a connecting section 41-b3 connecting the two. The lower end 41-b1 and the extension portion 41 -a connection, the upper end 41-b2 is located above the inner side of the lower end 41-b1, the connecting section 41-b3 is a rectangular cross section formed by the lower end 41-b1 extending to the upper end 41-b2, and the extension trajectory is a clockwise arc, and there are multiple contacts with the contacted piece 51, the contact portion 41-b adopts an arc-shaped configuration, so that the contact portion 41-b itself is in a curved state, so that the contact portion 41-b is arranged so that the contact portion 41-b is in a curved state whether it is in contact with the contacted piece 51. 1. The deformation caused by the extrusion pressure generated by the contact or the deformation caused by the influence of the current can all maintain the curled state, and the characteristic of the arc shape is that the outer peripheral surface of the connecting section 41-b3 always has a commanding height. This commanding height will change due to the change of the arc, but it can always maintain contact with the contacted piece 51, thereby ensuring the stability of the power supply and allowing the contact part 41-b to have elastic deformation ability. At the same time, the position of contact with the contacted piece 51 can be multiple, that is, if one of the contact points cannot contact the contacted piece 51, other contact points can be used to achieve contact and power supply between the two. At the same time, the extension part 41-a is tilted from the inside to the outside so that when the contact part 41-b contacts the contacted piece 51, the extension part 41-a will swing inward. After the swing, the extension part 41-a will generate a force to reset itself, so that under the blocking effect of the contacted piece 51, the contact tightness between the contact part 41-b and the contacted piece 51 is further increased.

[0030] Further improvement, the bottom surface of the connecting section 41-b3 is provided with an inwardly concave groove 41-b31, and the top surface of the connecting section 41-b3 is formed with an outwardly protruding spring piece 41-b32 through the groove 41-b31. The spring piece 41-b32 contacts the contacted piece 51. The thickness of the connecting section 41-b3 can be increased by the spring piece 41-b32. The thickness can increase the tightness of the connecting section 41-b3 when it acts on the contacted piece 51, because the moving distance of the conductive sheet 4 with the button 3 is still the same as that without increasing the thickness after the thickness is increased. The moving distance of the connecting section 41-b3 is such that the connecting section 41-b3 will inevitably be squeezed under the influence of the increased thickness, thereby being bent and generating a resistance force to reset itself through the bending, thereby ensuring the tight contact between the connecting section 41-b3 and the contacted piece 51. Moreover, the spring piece 41-b32 is in the shape of an isosceles triangle, and the right-angle end is transitioned through a circular arc. This arrangement can increase the structural strength of the connecting section 41-b3, so that the bending direction of the connecting section 41-b3 is limited, that is, the connecting section 41-b3 can only be bent along the arc trajectory of the connecting section 41-b3.

[0031] As for the contacted piece 51, the contacted piece 51 has a first contacted portion 51-a and a second contacted portion 51-b. The first contacted portion 51-a is integrally formed on the inner side wall of the contact foot 5, and the second contacted portion 51-b is integrally formed on the upper end of the first contacted portion 51-a and extends toward the contact piece 41. The first contacted portion 51-a and the second contacted portion 51-b are both in contact with the spring 41-b32. The contacted piece 51 is configured in an L shape by the arrangement of the first contacted portion 51-a and the second contacted portion 51-b. In this way, not only can the first contacted portion 51-a be utilized, but also the second contacted portion 51-b can be utilized. The width difference between the part 51-a and the contact foot 5 serves as the space in which the contact piece 41 does not contact the contacted piece 51 in the power-off state. The first contacted part 51-a and the second contacted part 51-b can also be used as the contacted parts that are in contact with the connecting section 41-b3 at the same time, thereby ensuring stability in the power-on state. Moreover, the L-shaped configuration also enables the contacted piece 51 to generate a clamping space, that is, to generate a restraining force to restrain the extension part 41-a from continuing to swing inward due to the stimulation of electric current, thereby ensuring stable contact between the contact part 41-b and the contacted piece 51.

[0032] In order to ensure the connection stability of the upper shell 1 and the lower shell 2 after splicing, a first notch 11 is provided in the center position of the front and rear end surfaces of the upper shell 1, and the first notch 11 is provided with a first plug-in block 6 extending downward and protruding outward at the middle of the upper shell 1, and a latch 7 adapted to the position of the first plug-in block 6 is provided in the center position of the front and rear end surfaces of the lower shell 2. A first insertion structure extending downward and passing through the latch 7 is provided at the middle of the latch 7. The first plug-in block 6 is inserted into the first insertion structure, and the latch 7 acts on the first notch 11 while being inserted. One purpose of the first notch 11 is to provide a setting space for the first plug-in block 6, and the second purpose is to allow the latch 7 to be placed inside after the upper shell 1 and the lower shell 2 are spliced, so that the two can be integrated after splicing, and the structure is simple, easy to operate, and the connection stability that can be provided is good, that is, the latch 7 The lateral width of the lowermost ear 7 that first enters the first notch 11 is consistent with the lateral width of the first notch 11, and then the ear 7 is moved upward by the guidance of the first notch 11. When it moves up to the first plug-in block 6, the first plug-in block 6 gradually enters the first insertion structure, and the outer side wall of the first plug-in block 6 is an inclined surface inclined from the inside to the outside. This arrangement makes the volume of the first plug-in block 6 only half of the volume of the first insertion structure. Its purpose is to avoid the interference of the first plug-in block 6 with the ear 7 when it moves upward, and the inclined surface makes the thickness of the first plug-in block 6 gradually increase, which can also generate a thrust to push the ear 7 outward, thereby allowing the first plug-in block 6 to be smoothly inserted into the first insertion structure. At the same time, the first plug-in block 6 will not be completely filled when it exists in the first insertion structure, so that when the splicing is subsequently released, the first plug-in block 6 can also quickly detach from the first insertion structure.

[0033] As for the ear 7, a second notch 21 is provided in the center of the front and rear end surfaces of the lower shell 2. The ear 7 has two connecting rods 71 ​​and two connecting blocks 72 for connecting the two connecting rods 71. The connecting rods 71 ​​are fixed to the corresponding inner side walls of the second notch 21 in a vertical arrangement and extend to the outside and above the second notch 21. The two connecting blocks 72 are respectively arranged at the upper and lower ends of the connecting rods 71, and the distance between the two connecting blocks 72 serves as a first insertion structure for the first insertion block 6 to be inserted therein. The outer side wall of the connecting block 72 is on the same horizontal plane as the outer side wall of the connecting rod 71, and the inner side wall of the connecting block 72 is an inclined surface inclined from the inside to the outside. The ear 7 is not arranged on the upper surface of the lower shell 2, but is arranged in the second notch 21 using the connecting rod 71. Compared with being arranged on the upper surface of the lower shell 2 The advantage is that the contact point of a single connecting rod 71 is changed from one to two, and the contact area is increased from the original bottom area of ​​the connecting rod 71 to the bottom area and side area of ​​the connecting rod 71, thereby increasing the connection stability of the ear 7 and increasing its resistance when a force is applied to it, that is, it will not be easily broken, and when it is swung outward in the disengaged state, it needs to be swung outward so that the first plug-in block 6 can be disengaged from the first insertion structure, thereby avoiding the problem that the first plug-in block 6 cannot be fully inserted into the first insertion structure. At the same time, the setting of the two connecting blocks 72 between the two connecting rods 71 ​​not only makes the structural strength of the ear 7 good, but also can form a first insertion structure, thereby simplifying the structure. The setting of the inner side wall of the connecting block 72 as a slope is also to constrain the swing amplitude of the ear 7.

[0034] Further improvement, the upper shell 1 is provided with two U-shaped thickened portions 12 symmetrically distributed in the front and rear. The thickened portion 12 extends to the lower end of the upper shell 1, and a second plug block 8 connected to the first plug block 6 is provided between the upper shell 1. The second plug block 8 is inserted into the second insertion structure formed by the inclined surface of the connecting block 72. One purpose of the thickened portion 12 is to thicken the wall thickness of the upper shell 1, and the U-shaped configuration makes its effective surface wide. The second purpose is to increase the overall length of the upper shell 1, and the thickened portion 12 is also integrally formed with the contact foot 5, so that the extended portion can be used to strengthen the strength of the contact foot 5, thereby compensating for the contact The defect of the foot 5 being relatively thin is that there will be no problem of bending and deformation of the contact foot 5 due to external force when connected to other components. At the same time, the outer wall of the thickened portion 12 is at the same level as the outer wall of the upper shell 1 after the first notch 11 is opened, which undoubtedly increases the installation area. Therefore, the usable length of the second plug-in block 8 can be consistent with the distance length from the upper end face of the upper connecting block 72 to the lower end face of the lower connecting block 72. In this way, the second plug-in block 8 can be simultaneously inserted into the second insertion structure formed by the inclined surface of the two connecting blocks 72, thereby increasing the splicing firmness of the upper shell 1 and the lower shell 2.

[0035] For further improvement, a spacing is formed between the two thickened parts 12 through spaced distribution to form a third insertion structure in the upper shell 1, and a filling part 9 is provided at the corresponding position of the lower shell 2 and the third insertion structure, which allows the filling part 9 to be squeezed by the two thickened parts 12 and fill the spacing when entering the third insertion structure. Such an arrangement allows the filling part 9 to be formed in the lower shell 2 with a structural shape when the upper shell 1 and the lower shell 2 are spliced ​​together, and can be integrally formed in the lower shell 2. Its lateral width is slightly larger than the spacing between the two thickened parts 12, so that after entering, it can be squeezed by the two thickened parts 12 and form a tight fit, so that the structural stability of the upper shell 1 and the lower shell 2 after splicing is better, that is, it will not be separated when falling to the ground or affected by other collision factors, and the upper end of the filling part 9 is triangular in configuration, which can reduce the lateral width of the upper end and facilitate the rapid entry of the filling part 9.

[0036] As a further improvement, channels 22 for the contact pins 5 to pass through are opened at four right-angle positions inside the lower shell 2, so that the contact pins 5 pass through the channels 22, which makes it easier for the contact pins 5 to be connected to other components.

[0037] For further improvement, a positioning rod 23 is fixed at the center position inside the lower shell 2, and a spring 10 is provided on the outer sleeve of the positioning rod 23. The upper end of the spring 10 is placed in the button 3. In the disconnected state, the button 3 slides downward and the spring 10 is in a compressed state. In the powered state, the button 3 slides upward and the spring 10 returns to its initial state. In this way, the spring 10 can prevent the button 3 from moving downward without external force under its elastic action, thereby ensuring the stability and continuity of the power supply.

[0038] Although the invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A push button switch, comprising an upper housing (1), a lower housing (2), a button (3), a conductive sheet (4), and a contact pin (5), characterized in that: The conductive sheet (4) is connected to the button (3) and realizes power off / on by downward / upward movement of the button (3), and the outer side wall of the conductive sheet (4) extending to the outside of the button (3) is provided with a plurality of contact sheets (41) corresponding to the plurality of contact feet (5) on the same side, and the inner side wall of the upper end of the contact foot (5) is provided with a contacted sheet (51) extending inward, and the contact sheet (41) contacts the contacted sheet (51) in the power-on state and generates a force that causes the contact sheet (41) to bend inward when in contact, and the contact sheet (41) does not contact the contacted sheet (51) in the power-off state and is located in a gap of a width difference formed between the contact foot (5) and the contacted sheet (51); The contact piece (41) has an extension portion (41-a) and two contact portions (41-b), the extension portion (41-a) is integrally formed on the outer side wall of the conductive piece (4) and is inclined from the inner bottom to the outer top, the two contact portions (41-b) are integrally formed on the extension portion (41-a) and are symmetrically distributed front to back, and the contact portion (41-b) has a lower end (41-b1), an upper end (41-b2) and a connecting section (41-b3) connecting the two, the lower end (41-b1) is connected to the extension portion (41-a), the upper end (41-b2) is located above the lower end (41-b1) and the connecting section (41-b3) is a rectangular cross section formed by extending from the lower end (41-b1) to the upper end (41-b2), and the extension trajectory is a clockwise arc, and contacts the contacted piece (51) at multiple locations.

2. The key switch according to claim 1, wherein: An inwardly recessed groove (41-b31) is provided on the bottom surface of the connecting section (41-b3), and an outwardly protruding elastic sheet (41-b32) is formed on the top surface of the connecting section (41-b3) through the groove (41-b31), and the elastic sheet (41-b32) contacts the contacted sheet (51).

3. The key switch according to claim 2, characterized in that: The contacted piece (51) comprises a first contacted portion (51-a) and a second contacted portion (51-b), wherein the first contacted portion (51-a) is integrally formed on the inner side wall of the contact foot (5), and the second contacted portion (51-b) is integrally formed on the upper end of the first contacted portion (51-a) and extends toward the contact piece (41), and the first contacted portion (51-a) and the second contacted portion (51-b) are both in contact with the spring piece (41-b32).

4. The key switch according to claim 1, wherein: The front and rear end surfaces of the upper shell (1) are both centrally provided with a first notch (11), and a first plug-in block (6) extending downward and protruding outward is provided at the middle of the upper shell (1). The front and rear end surfaces of the lower shell (2) are both centrally provided with a latch (7) adapted to the position of the first plug-in block (6), and a first insertion structure extending downward and penetrating the latch (7) is provided at the middle of the latch (7). The first plug-in block (6) is inserted into the first insertion structure, and the latch (7) acts on the first notch (11) during the insertion.

5. The key switch according to claim 4, characterized in that: A second notch (21) is provided at the center of the front and rear end surfaces of the lower shell (2), the ear (7) has two connecting rods (71) and two connecting blocks (72) for connecting the two connecting rods (71), the connecting rods (71) are fixed to the corresponding inner side walls of the second notch (21) in a vertical arrangement and extend to the upper part of the outside of the second notch (21), the two connecting blocks (72) are respectively arranged at the uppermost end and the lowermost end of the connecting rod (71), and the distance between the two connecting blocks (72) serves as a first insertion structure for the first insertion block (6) to be inserted therein, the outer side wall of the connecting block (72) and the outer side wall of the connecting rod (71) are in the same horizontal plane, and the inner side wall of the connecting block (72) is an inclined surface inclined from the inner bottom to the outer top.

6. The key switch according to claim 5, characterized in that: Two thickened portions (12) having a U-shaped configuration and symmetrically distributed frontally and rearwardly are provided inside the upper shell (1). The thickened portion (12) extends to the lower end of the upper shell (1), and a second plug-in block (8) connected to the first plug-in block (6) is provided between the thickened portion (12) and the upper shell (1). The second plug-in block (8) is inserted into a second insertion structure formed by the inclined surface of the connecting block (72).

7. The key switch according to claim 6, characterized in that: A gap formed by the spaced distribution between the two thickened portions (12) forms a third insertion structure in the upper shell (1), and the lower shell (2) is provided with a filling portion (9) at a position corresponding to the third insertion structure, which allows the filling portion (9) to be squeezed by the two thickened portions (12) and fill the gap when entering the third insertion structure.

8. The key switch according to claim 1, wherein: Channels (22) for the contact pins (5) to pass through are provided at four right-angled positions inside the lower shell (2).

9. The key switch according to claim 1, wherein: A positioning rod (23) is fixed at a central position inside the lower shell (2), and a spring (10) is provided on the outer sleeve of the positioning rod (23), and the upper end of the spring (10) is placed inside the button (3).

Images