CN212967499U

CN212967499U - Key switch

Info

Publication number: CN212967499U
Application number: CN202022023485.XU
Authority: CN
Inventors: 许迪佳; 龚金和
Original assignee: Ningbo Gongniu Electric Appliances Co Ltd
Current assignee: Ningbo Gongniu Electric Appliances Co Ltd
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2021-04-13
Anticipated expiration: 2030-09-16

Abstract

The utility model discloses a key switch relates to switch contact operating device technical field for solve among the prior art because of the too big problem that leads to key switch fragile of the effort of button effect on dabbing the switch. The key switch comprises a shell, a circuit board, a mounting seat, a key, a wane and an elastic piece, wherein the circuit board is fixed in the shell and is provided with at least one light touch switch; the mounting seat is fixed in the shell; the key is provided with at least one key which corresponds to the tact switches one by one, the key is rotatably assembled on the mounting seat, and the key comprises a driving arm, a driven arm and a reset part; the rocker is provided with at least one button which corresponds to the button one by one, and the rocker is rotatably assembled on the shell; when the rocker is in a free state, the driving arm is in contact with the rocker, a gap is reserved between the driven arm and the rocker, and the rocker can drive the driven arm to rotate from an initial position to a pressing position for pressing the tact switch; the elastic member acts between the reset portion and the housing or between the reset portion and the mount.

Description

Key switch

Technical Field

The utility model relates to a switch contact operating device technical field especially relates to a key switch.

Background

The key switch generally comprises a shell, a circuit board, a mounting seat, a key and a rocker, wherein the circuit board and the mounting seat are fixedly mounted in the shell, the circuit board is provided with a tact switch, the key is rotatably assembled on the mounting seat, the key is provided with a pressing part for pressing the tact switch and a jacking part in jacking fit with the rocker, and the rocker is rotatably assembled on the shell; after the key switch is assembled and when no one presses the rocker, the rocker is in a free state, and the top pressing part of the key presses the rocker at the moment; when key switch is operated to needs, the user presses the wane, and the wane rotates through pressing the top pressure portion drive button on the button, and then makes pressing the splenium on the button can press the switch that dabs on the circuit board to realize key switch's function.

When the key switch is used, the key has no buffer in the process of pressing the touch switch, and the acting force of the key on the touch switch is too large.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a key switch for solve among the prior art because of the too big problem that leads to key switch to be fragile of the effort of button effect on dabbing the switch.

In order to achieve the above object, the utility model provides a key switch adopts following technical scheme:

the key switch includes:

a housing;

the circuit board is fixed in the shell and provided with at least one tact switch;

the mounting seat is fixed in the shell;

the key is provided with at least one key which corresponds to the tact switches one by one, the key is rotatably assembled on the mounting seat through a rotating shaft, the key also comprises a driving arm, a driven arm and a reset part, the driving arm, the driven arm and the reset part are arranged on the rotating shaft, and the driven arm is used for pressing the tact switches;

the rocker is provided with at least one button, and the rocker is in one-to-one correspondence with the buttons and is rotatably assembled on the shell;

when the rocker is in a free state, the driving arm is in contact with the rocker, a gap is reserved between the driven arm and the rocker, and the rocker can drive the driven arm to rotate from an initial position to a pressing position for pressing the tact switch by pressing the driving arm in a rotating stroke;

and the elastic piece acts between the resetting part and the shell or acts between the resetting part and the mounting seat and is used for rotating the driven arm from the pressing position to the initial position.

The utility model provides a key switch's beneficial effect is: when the rocker is in a free state (namely the state of the rocker when a user does not press the rocker), the driving arm is in contact with the rocker, a gap is reserved between the driven arm and the rocker, when the user presses the rocker, the rocker drives the key to rotate by pressing the driving arm, and the driven arm rotates along with the key and gradually rotates to a pressing position for pressing the tact switch from an initial position (namely the position of the driven arm when the rocker is in the free state), so that the function of the key switch is completed; in the process that the driven arm presses the tact switch, the rocker presses the driving arm to drive the driven arm to press the tact switch, and the driving arm has a certain length and can deform to a certain extent, so that when the driven arm presses the tact switch to complete the operation of the tact switch, the driving arm can stop the rotation of the key or reduce the rotation amplitude of the key through deformation, the phenomenon that the passive arm presses the tact switch excessively is avoided, the phenomenon that the acting force of the driven arm on the tact switch is too large to cause the damage of the key switch and the circuit board is avoided, and the damage of the key switch is prevented; in addition, the driven arm has a certain length, so that the driven arm can deform to a certain extent, and thus, the driven arm can weaken the acting force on the tact switch through the deformation of the driven arm per se, and further, the tact switch is prevented from being pressed excessively; moreover, because master arm and wane contact, have the interval between slave arm and the wane, so the wane rotates a less angle and can realize that the slave arm presses the light touch switch, and so, the rotation space that the wane needs is less, can reduce the size of casing, improves this key switch's compact structure nature.

Furthermore, the mounting seat is provided with a limiting bulge, and the limiting bulge limits the driven arm when the driven arm rotates to the pressing position. With this arrangement, it is possible to further prevent the driven arm from pressing the tact switch excessively to cause damage to the tact switch and the circuit board.

Furthermore, the mounting seat is of a plate-shaped structure, the mounting seat covers the circuit board, a through hole for the light touch switch to be inserted into is formed in the mounting seat, and a pressing protrusion capable of being inserted into the through hole to press the light touch switch is arranged on the driven arm. The gap between the mounting seat and the circuit board can be reduced, and the structural compactness of the key switch is further improved.

Furthermore, the limiting bulge surrounds the via hole and surrounds the via hole. The arrangement enables the driven arm to be stopped timely and accurately.

Furthermore, a stopping structure is arranged on the shell and limits the rocker when the rocker presses the driving arm to a set position. The stop structure is arranged to prevent the driving arm and the driven arm from deforming beyond the elastic deformation limit of the driving arm and the driven arm due to the fact that the rocker is too large in rotation angle.

Furthermore, reinforcing ribs are arranged on the side surface of the driving arm facing to and/or back to the circuit board. By such an arrangement, the structural strength of the active arm can be improved.

Furthermore, the elastic part is a torsion spring sleeved on the rotating shaft, the torsion spring is provided with a first force application end and a second force application end, the torsion directions of the first force application end and the second force application end are opposite, the first force application end acts on the mounting seat, and the second force application end acts on the reset part. The driven arm can be conveniently driven to rotate to the initial position from the pressing position through the torsion spring, the torsion spring is simple to mount, and a mounting structure of the elastic piece is not required to be arranged on the mounting seat, so that the complexity of the overall structure of the key switch can be reduced.

Furthermore, an avoiding hole for the first force application end to extend into is formed in the mounting seat, and the first force application end acts on the hole wall of the avoiding hole. The installation structure of the key switch can reduce the space of the torsion spring occupying the upper side of the installation seat, and can improve the structural compactness of the key switch.

Further, the driving arm and the driven arm are located between the rotation central axis of the rocker and the rotation central axis of the rotating shaft. With this arrangement, the user can drive the follower arm to the depressed position with only a small amount of force applied to the rocker.

Further, the reset part is pressed on the mounting seat when the driven arm is at the initial position, a positioning bulge is arranged on one side, facing the mounting seat, of the reset part, and the reset part is in contact with the mounting seat through the positioning bulge. The size that can set up the other parts that the location is protruding to compare the portion that resets is less, and then can reduce the consumptive material of button.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an exploded perspective view of an embodiment of a push switch provided in the present invention;

fig. 2 is a schematic view illustrating the installation of the casing, the circuit board and the tact switch in the embodiment of the key switch provided by the present invention;

fig. 3 is a schematic structural diagram of a mounting seat in an embodiment of a key switch provided in the present invention;

fig. 4 is a schematic structural diagram of a key in an embodiment of the key switch provided in the present invention;

fig. 5 is a schematic view of a torsion spring mounted on a key according to an embodiment of the key switch provided by the present invention;

fig. 6 is a schematic diagram of a key switch according to an embodiment of the present invention, which is configured to cooperate with a nearby structure after the key is mounted;

fig. 7 is a schematic diagram of states of structures before a user presses a rocker in an embodiment of the key switch provided by the present invention;

fig. 8 is a schematic diagram illustrating states of structures when the pressing protrusion contacts the tact switch according to an embodiment of the present invention;

fig. 9 is a schematic diagram showing the state of the structures when the driven arm is stopped by the limit projection in the embodiment of the push switch of the present invention.

In the drawings: 1-shell, 2-circuit board, 3-mounting seat, 4-key, 5-torsion spring, 6-rocker, 7-tact switch, 11-skirt edge, 31-via hole, 32-limit protrusion, 33-mounting groove, 41-rotating shaft, 42-driving arm, 43-driven arm, 44-reset plate, 51-spring ring, 52-first force application end, 53-second force application end, 61-stopping part, 331-mounting hole, 421-reinforcing rib, 431-pressing protrusion and 441-positioning protrusion.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The utility model provides a key switch's embodiment:

as shown in fig. 1-3, the key switch includes a housing 1, a circuit board 2, a mounting seat 3, a key 4, a torsion spring 5, a rocker 6 and a tact switch 7, wherein the circuit board 2 is mounted in the housing 1, the mounting seat 3 is a plate-shaped structure, the mounting seat 3 is press-fitted on the circuit board 2 and fixedly connected with the housing 1 through screws, and the circuit board 2 is fixed while the mounting seat 3 is fixed; dab switch 7 and be equipped with threely, three in the definition this embodiment dabs switch 7 and arranges along left right direction, the thickness direction of circuit board 2 is upper and lower direction, three dabs switch 7 install on circuit board 2 and with circuit board 2 signal connection, it all is equipped with via hole 31 to correspond each dabs switch 7 on mount pad 3, after circuit board 2 and mount pad 3 are fixed with casing 1, three dabs switch 7 and stretches into respectively on mount pad 3 in the via hole 31 that corresponds, mount pad 3 all is equipped with round spacing arch 32 around each via hole 31 on the side of circuit board 2 dorsad.

As shown in fig. 1, 3, 4 and 5, the key 4 includes a rotating shaft 41, a driving arm 42, a driven arm 43 and a reset plate 44 are disposed on an outer circumferential surface of the rotating shaft 41, the driving arm 42, the driven arm 43 and the reset plate 44 are made of nylon and are formed by an integral injection molding process, and the driving arm 42 and the driven arm 43 are both long, so that they have certain elasticity and can deform. One side of the mounting seat 3, which is opposite to the circuit board 2, is provided with a mounting groove 33 corresponding to the three through holes 31, the left and right groove walls of the mounting groove 33 are provided with a guide groove extending up and down, the bottom of the guide groove is provided with a mounting hole 331 extending left and right along the axis, and the two mounting holes 331 in the same mounting groove 33 are opposite and coaxial left and right. When the key 4 is used, the key is installed in the installation groove 33, the distance between the bottoms of the two guide grooves in the same installation groove 33 is slightly smaller than the axial size of the rotating shaft 41, the size of the guide grooves in the front-back direction is slightly larger than the diameter of the rotating shaft 41, and the diameter of the installation hole 331 is slightly larger than the diameter of the rotating shaft 41; when the key 4 is installed, the two ends of the rotating shaft 41 are squeezed into the two guide grooves by the deformation of the rotating shaft 41, so that the rotating shaft 41 moves to the installation holes 331, and finally the two ends of the rotating shaft 41 respectively extend into the two installation holes 331, and after the key 4 is installed, the key 4 can rotate around the rotating central axis of the rotating shaft 41 in the installation groove 33. In this embodiment, there are two keys 4, and the two keys 4 are respectively installed in the leftmost and rightmost installation grooves 33 on the installation base 3.

As shown in fig. 1 and 7, in the present embodiment, two seesaws 6 are provided, front ends of the two seesaws 6 are hinged to a front end of the housing 1, so that the two seesaws 6 can rotate around a rotation central axis extending left and right, and a mutually matched limiting structure (not shown in the figure) is provided between rear ends of the two seesaws 6 and the rear end of the housing 1, so as to prevent the seesaw 6 from excessively rotating upwards, so that the two seesaws 6 can only rotate within a specific angle range, and the connection between the seesaw 6 and the housing 1 is the prior art, which is not described herein again. The rocker 6 is defined to be in the starting position when it is pivoted upwards to be stopped by the above-mentioned limit structure. The driving arm 42 and the driven arm 43 of the key 4 in this embodiment are located between the rotation center axis of the rotating shaft 41 and the rotation center axis of the rocker 6.

As shown in fig. 1 and 5, the torsion spring 5 includes two coils 51, one end of each coil 51 forms a first force application end 52, and the other ends of the two coils 51 are connected together to form a common second force application end 53, and the first force application end 52 and the second force application end 53 are twisted in opposite directions. In this embodiment, two torsion springs 5 are provided and are respectively installed on two keys 4, two coils 51 of each torsion spring 5 are respectively sleeved on the rotating shaft 41 from two ends of the rotating shaft 41 when the torsion spring 5 is installed, and the torsion spring 5 is installed on the key 4 before the key 4 is installed in the installation groove 33. The torsion spring 5 constitutes an elastic member.

As shown in fig. 6 and 7, an avoiding hole (not shown) is formed in the front portion of the bottom of each mounting groove 33, and when the key 4 is mounted in the mounting groove 33, the two first force applying ends 52 of the torsion spring 5 can extend into the corresponding avoiding holes and press against the wall of the front side hole of the avoiding hole; when the key 4 is installed, the first force application end 52 of the torsion spring 5 is in a pre-pressing state, and at the moment, the second force application end 53 of the torsion spring 5 is pressed on the reset plate 44 of the key 4, and the reset plate 44 is pressed on the groove bottom surface of the installation groove 33; at this time, the rocker 6 is mounted on the housing 1, the driving arm 42 on the key 4 pushes the rocker 6 upward to make the rocker 6 be at the initial position, and when the rocker 6 is at the initial position, a gap is formed between the rocker 6 and the driven arm 43 of the key 4. The follower arm 43 is provided with a pressing protrusion 431 on a side facing the mount base 3, the pressing protrusion 431 is integrally formed with the follower arm 43, and the pressing protrusion 431 has a cylindrical shape whose diameter is smaller than the minimum dimension of the through hole 31 in the mount base 3 in the horizontal direction.

As shown in fig. 7, 8 and 9, in use, the rocker 6 is in its initial position before the user presses the rocker 6, and the rocker 6 is in its free state; when a user presses the rocker 6, the rocker 6 rotates and presses the driving arm 42, the driving arm 42 is pressed to drive the key 4 to rotate, and the key 4 rotates anticlockwise at the moment, and meanwhile the driven arm 43 and the reset plate 44 also rotate anticlockwise; in the process that the driven arm 43 rotates counterclockwise, the pressing protrusion 431 on the driven arm 43 can extend into the through hole 31 on the mounting base 3 and press the tact switch 7, thereby realizing the power on or off of the circuit board 2 (in this embodiment, the tact switch 7 is matched with the circuit board 2, when the tact switch 7 is pressed for the first time, the circuit board 2 is powered on, when the tact switch 7 is pressed for the second time, the circuit board 2 is powered off, and the matching and the specific structure of the tact switch 7 and the circuit board 2 are repeated, and the matching and the specific structure of the tact switch 7 and the circuit board 2 are mature technologies in the switch field, and the detailed structure of the tact switch 7 and the specific matching mode of the circuit board 2 are not repeated here, of course, in other embodiments, the circuit board 2 can be powered on when the tact switch 7 is pressed, and when the tact switch 7 is not pressed, the circuit board 2, when the pressing protrusion 431 presses the tact switch 7 to a certain extent, the side surface of the follower arm 43 facing the mount base 3 is stopped by the stopper protrusion 32 provided on the peripheral side of the through hole 31, thereby preventing the pressing protrusion 431 from pressing the tact switch 7 excessively; after the follower arm 43 is stopped, the user cannot see that the follower arm 43 is stopped, and therefore, the user can further press the rocker 6 to further rotate the rocker 6 by a small angle, and in the process, the rocker 6 further presses the master arm 42, and since the follower arm 43 is stopped, the master arm 42 and the follower arm 43 are both elastically deformed to meet the pressing of the rocker 6.

As shown in fig. 2, 7, 8 and 9, in the process that the driven arm 43 is stopped and the rocker 6 continues to press the driving arm 42, in order to prevent the driving arm 42 and the driven arm 43 from being excessively deformed, a stop portion 61 is disposed at the rear end of the rocker 6, when the rocker 6 is pressed and rotated by a certain angle, the stop portion 61 on the rocker 6 is stopped by the skirt 11 at the corresponding position on the housing 1, when the stop portion 61 is stopped by the skirt 11, the driving arm 42 is pressed to the set position, and the height of the skirt 11 is set appropriately, so that it can be ensured that the driving arm 42 and the driven arm 43 are not excessively deformed and damaged when the driving arm 42 is pressed to the set position. Skirt 11, which is in stop engagement with stop 61 on rocker 6, constitutes a stop structure on housing 1.

As shown in fig. 7, 8 and 9, when the user releases the rocker 6, the second force application end 53 of the torsion spring 5 presses the reset plate 44 of the button 4, so that the button 4 rotates clockwise, during the clockwise rotation of the button 4, the pressing protrusion 431 on the driven arm 43 releases the tact switch 7, and the driving arm 42 pushes the rocker 6, when the reset plate 44 is pressed on the bottom surface of the mounting groove 33, the button 4 stops rotating, and the rocker 6 is pushed to its initial position.

When rocker 6 is in the starting position, follower arm 43 on button 4 is in its initial position, and when follower arm 43 is stopped by stop lug 32, follower arm 43 is in its depressed position.

As shown in fig. 5, 7, 8 and 9, the positioning protrusion 441 is disposed on the side surface of the reset plate 44 facing the bottom surface of the mounting groove 33, and the size of the positioning protrusion 441 in the left-right direction can be set to be smaller, so that the size of the reset plate 44 in the circumferential direction of the rotating shaft 41 is ensured to be larger, the second force application end 53 of the torsion spring 5 can provide a larger restoring force for the key 4, and the consumption of the reset plate 44 is reduced. The reset plate 44 constitutes a reset portion of the key 4.

As shown in fig. 4, 5 and 8, in order to improve the structural strength of the active arm 42, reinforcing ribs 421 are provided on both sides of the active arm 42 facing and away from the circuit board 2, and the reinforcing ribs 421 are elongated protrusions extending along the length direction of the active arm 42.

In the above-mentioned embodiment, be equipped with three on the circuit board and dabble the switch, the button is equipped with two, and the wane is equipped with two equally, and two buttons of two wane control rotate, and two buttons correspond two and dabble the switch respectively. In other embodiments, the number of the tact switches, the number of the keys and the number of the rocker can be other numbers, and the number of the keys is not more than the number of the tact switches.

In the above embodiment, the mounting seat is provided with the mounting groove, and the key is rotatably assembled in the mounting groove through the rotating shaft. In other embodiments, two mounting plates can be arranged on the mounting seat corresponding to each key, the two mounting plates are arranged at intervals from left to right, the two mounting plates are provided with mounting holes which are opposite from left to right and extend from left to right, the spacing distance between the two mounting plates is slightly smaller than the axial dimension of the rotating shaft, and the rotating shaft is inserted into the two mounting holes to realize rotating assembly and can be used as well.

In the above embodiment, the elastic member is a torsion spring, the mounting seat is provided with an avoiding hole corresponding to the first force application end of the torsion spring, and the first force application end acts on the front side hole wall of the avoiding hole. In other embodiments, the mounting seat may not be provided with an avoidance hole, the first force application end directly acts on the bottom surface of the mounting groove on the mounting seat, or the mounting seat is provided with an avoidance hole, a region opposite to the lower side of the avoidance hole is free of a circuit board, and the first force application end passes through the avoidance hole and then acts on the shell, and the first force application end can also be used; the torsional spring also can be replaced by other elastic component, if can be ordinary spring, set up an holding tank on the tank bottom surface of mounting groove, the tank bottom at the holding tank is fixed to the one end of ordinary spring, the other end is fixed on the protruding side towards mounting groove tank bottom surface of location, and set up ordinary spring and be in tensile state when the wane is in the initial position, then at the anticlockwise rotation in-process of button, ordinary spring is further stretched, and then when the user loosens the wane, ordinary spring can pull the reset plate clockwise turning and make the button reset.

In the above embodiment, a circle of limiting protrusions is disposed around the through hole of the mounting seat, and when the driven arm of the key is at the pressing position, the limiting protrusions limit and stop the driven arm. In other embodiments, the limiting protrusion may also be disposed at other positions of the mounting seat, such as the rear side or the front side corresponding to the via hole, as long as the driven arm can be limited and stopped; of course, the limiting protrusion is not required to be arranged, and the limiting protrusion can be used.

In the above embodiments, the driving arm and the driven arm of the key are located between the rotation central axis of the rotating shaft and the rotation central axis of the rocker. In other embodiments, the driving arm and the driven arm of the key may also be located on a side of the rotation central axis of the rotating shaft away from the rotation central axis of the rocker, and the same may also be used.

In the above embodiment, the skirt edge on the housing blocks the rocker when the rocker presses the active arm to the set position, and the skirt edge for blocking the rocker constitutes a blocking structure. In other embodiments, the housing may not be provided with a stopping structure for stopping the rocker, and a user may determine to turn the light touch switch on or off by rotating a certain angle according to experience.

In the above embodiment, the side surfaces of the driving arm facing and facing away from the circuit board are provided with the reinforcing ribs. In other embodiments, the reinforcing rib may be only disposed on the side of the active arm facing the circuit board, or only disposed on the side facing away from the circuit board.

In the above embodiment, the side of the reset plate facing the bottom surface of the mounting groove is provided with the positioning protrusion. In other embodiments, the reset plate may not have positioning protrusions and may be used as well.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A key switch, comprising:

a housing (1);

the circuit board (2) is fixed in the shell (1), and at least one light touch switch (7) is arranged on the circuit board;

the mounting seat (3) is fixed in the shell (1);

the key (4) is provided with at least one key and corresponds to the light touch switches (7) one by one, the key (4) is rotatably assembled on the mounting seat (3) through a rotating shaft (41), the key (4) further comprises a driving arm (42), a driven arm (43) and a reset part, the driving arm (42), the driven arm (43) and the reset part are arranged on the rotating shaft (41), and the driven arm (43) is used for pressing the light touch switches (7);

the rocker (6) is provided with at least one and corresponds to the keys (4) one by one, and the rocker (6) is rotatably assembled on the shell (1);

when the rocker (6) is in a free state, the driving arm (42) is in contact with the rocker (6), a gap is reserved between the driven arm (43) and the rocker (6), and the rocker (6) can drive the driven arm (43) to rotate from an initial position to a pressing position for pressing the tact switch (7) by pressing the driving arm (42) in a rotating stroke;

an elastic member acting between the reset portion and the housing (1) or between the reset portion and the mount (3) for rotating the follower arm (43) from the pressed position to the initial position.

2. A push-button switch according to claim 1, characterised in that the mounting (3) is provided with a stop protrusion (32), which stop protrusion (32) stops the driven arm (43) when the driven arm (43) is rotated to the depressed position.

3. The push switch according to claim 2, wherein the mounting base (3) is a plate-shaped structure, the mounting base (3) is covered on the circuit board (2), a through hole (31) for inserting the tact switch (7) is formed on the mounting base (3), and a pressing protrusion (431) capable of being inserted into the through hole (31) to press the tact switch (7) is formed on the driven arm (43).

4. A key switch according to claim 3, wherein said limiting protrusion (32) surrounds said through hole (31) and surrounds said through hole (31) around the periphery of said through hole (31).

5. The key switch according to claim 1, 2, 3 or 4, wherein the housing (1) is provided with a stopping structure, and the stopping structure limits the rocker (6) when the rocker (6) presses the driving arm (42) to a set position.

6. A key switch according to claim 1 or 2 or 3 or 4, characterised in that a reinforcement (421) is provided on the side of the active arm (42) facing and/or facing away from the circuit board (2).

7. A key switch according to claim 1 or 2 or 3 or 4, characterized in that said elastic member is a torsion spring (5) sleeved on said rotating shaft (41), said torsion spring (5) has a first force application end (52) and a second force application end (53) with opposite torsion directions, said first force application end (52) acts on said mounting seat (3), said second force application end (53) acts on said reset portion.

8. The key switch according to claim 7, wherein the mounting base (3) is provided with an avoiding hole for the first force applying end (52) to extend into, and the first force applying end (52) acts on the wall of the avoiding hole.

9. A key switch according to claim 1 or 2 or 3 or 4, characterised in that said master arm (42) and said slave arm (43) are located between the centre axis of rotation of said rocker (6) and the centre axis of rotation of said rotary shaft (41).

10. A push-button switch according to claim 1 or 2 or 3 or 4, characterised in that the reset portion is pressed against the mounting (3) when the driven arm (43) is in the initial position, that the reset portion is provided with a positioning projection (441) on the side facing the mounting (3), and that the reset portion is in contact with the mounting (3) via the positioning projection (441).