CN211908618U - Press self-reset self-generating switch - Google Patents

Abstract

The utility model relates to a press self-reset self-generating switch, which comprises a base and an upper cover which are mutually matched, a coil, a PCB board, two magnetic conductive sheets which are distributed at intervals up and down and are parallel to each other and a reset spring are arranged in the base, a magnet which is respectively matched with the magnetic conductive sheets from top to bottom is arranged between the two magnetic conductive sheets, the two magnetic conductive sheets are fixed on the top and the bottom of a magnet fixing frame, the coil is sleeved outside the iron core, one end of the iron core extends into the space between the two magnetic conductive sheets and is correspondingly matched with the magnet, the other end of the iron core is fixed in the base, two guide rods are arranged in the base, two ends of the magnet fixing frame are respectively sleeved outside the guide rods, the guide rods below the magnet fixing frame are sleeved with one reset spring, the upper cover is provided with a button, and a push plate which is abutted against the magnet fixing frame and can drive the magnet fixing frame to move downwards when the button is pressed is arranged below the button. The structure is simpler in overall structure, more convenient to install and higher in overall stability.

Description

Press self-reset self-generating switch

Technical Field

The utility model relates to a from power generation facility's technical field, more specifically relate to press from self-reset formula spontaneous switch.

Background

The self-generating wireless switch can realize the functions of turning on, turning off, multi-control, mutual control and the like without connecting a light wire body and installing a power supply battery. The mechanical energy is converted into electric energy by utilizing the habitual action of pressing the switch by the fingers of people, and the radio frequency control signal is emitted without a battery energy storage device, so that the radio frequency control switch is widely applied to the life of people and used as a switch.

However, the current self-generating wireless switch has the following problems: 1. the internal structure is complex and the installation is inconvenient; 2. the stability of the overall reset is poor and therefore improvements are needed.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a simple structure, simple to operate, the good self-generating switch of pressing of stability that wholly resets are pressed.

In order to solve the technical problem, the technical scheme of the utility model is that: a press self-reset self-generating switch comprises a base and an upper cover which are mutually matched, wherein a coil, a PCB (printed Circuit Board), two magnetic conductive sheets which are vertically distributed at intervals and are mutually parallel and a reset spring are arranged in the base, a magnet which is respectively matched with the magnetic conductive sheets from top to bottom is arranged between the two magnetic conductive sheets, the two magnetic conductive sheets are fixed on the top and the bottom of a magnet fixing frame, the coil is sleeved outside the iron core, one end of the iron core extends into the space between the two magnetic conductive sheets and is correspondingly matched with the magnet, the other end of the iron core is fixed in the base, two guide rods are arranged in the base, two ends of the magnet fixing frame are respectively sleeved outside the guide rods, the guide rods below the magnet fixing frame are sleeved with one reset spring, the upper cover is provided with a button, and a push plate which is abutted against the magnet fixing frame and can drive the magnet fixing frame to move downwards when the button is pressed is arranged below the button.

In order to facilitate the operation, one side of the base is provided with a hinged shaft, a catching groove which is rotatably connected on the hinged shaft is arranged in the upper cover, the other side of the base is provided with a lower limiting hook, an upper limiting hook which is mutually buckled with the lower limiting hook is arranged in the upper cover, and the button and the upper cover are integrally formed.

In order to limit the movable position of the magnet fixing frame and avoid the magnet fixing frame from deviating from the guide rod when resetting, and later-stage power generation failure is caused, guide plates are arranged on the periphery of the base relative to the magnet fixing frame, a limiting hole for installing the magnet fixing frame is formed by the guide plates on the periphery in a matched mode, the guide rods are arranged in the limiting hole, and first barbs for preventing the magnet fixing frame from deviating from the guide rods are arranged on the guide plates on the two sides of symmetry.

In order to facilitate installation, the coil is fixed outside the iron core through the coil support.

In order to fix the iron core, one side in the base is provided with an iron core mounting frame, and the other side in the base is provided with an iron core limiting groove, wherein the iron core is clamped between the iron core mounting frame and the iron core limiting groove.

In order to carry out spacingly to the iron core, avoid influencing the generating efficiency, the iron core mounting bracket include the fixed plate, be located the second barb of fixed plate both sides, be equipped with the third barb in the outside of iron core spacing groove, the lower surface and fixed plate, iron core spacing groove of iron core offset, the both sides of iron core upper surface offset with second barb and third barb respectively.

For the installation of convenience, be equipped with first mounting groove, second mounting groove and the third mounting groove that communicates each other in proper order from the top down at the magnet mount, the magnetic conductive piece of top inserts in the first mounting groove, and magnet inserts in the second mounting groove, and the magnetic conductive piece of below inserts in the third mounting groove, first mounting groove, second mounting groove and third mounting groove constitute "worker" style of calligraphy structure, just iron core one end is inserted in the second mounting groove and is had the interval with upper and lower magnetic conductive piece, still be equipped with in magnet mount both sides with guide bar complex through hole, the upper cover closes the base lid in the upper cover.

The invention also discloses a press self-reset self-generating switch, which comprises a base and an upper cover which are matched with each other, a coil, a PCB board, two magnetic conductive sheets which are distributed at intervals up and down and are parallel to each other and a reset spring are arranged in the base, a magnet which is respectively matched with the magnetic conductive sheets from top to bottom is arranged between the two magnetic conductive sheets, the two magnetic conductive sheets are fixed on the top and the bottom of a magnet fixing frame, the coil is sleeved outside the iron core, one end of the iron core extends into the space between the two magnetic conductive sheets and is correspondingly matched with the magnet, the other end of the iron core is fixed in the base, a push plate which is arranged below the button and is abutted against the magnet fixing frame and can drive the magnet fixing frame to move downwards when the button is pressed down, the side of the magnet fixing frame is provided with a connecting rod which is rotatably connected with the base, and the reset spring is a pagoda-shaped spring or a double-torsion spring structure which can reset the magnet fixing frame.

Furthermore, when the return spring is a pagoda-shaped spring, the return spring is abutted between the lower part of the magnet fixing frame and the base.

Further, reset spring be two torsional springs, integrated into one piece has torsional spring connecting portion between two torsional springs of two torsional springs, is equipped with the torsional spring mount that is located the iron core both sides in the base, all is equipped with a torsional spring fixed column that is arranged in cup jointing two torsional springs in each torsional spring mount outside, torsional spring connecting portion offset with magnet mount lower surface, and the magnet mount is pressed the back, two torsional springs are in the state of wrench movement.

The utility model discloses compare prior art, its overall structure is simpler, and it is more convenient to install, realizes resetting more stably through the cooperation of both sides guide bar and spring simultaneously.

Drawings

FIG. 1 is a schematic view showing the overall structure of a self-energizing switch of the push-to-reset type in accordance with embodiment 1;

FIG. 2 is an exploded view of the entire structure of a self-resetting self-generating switch pressed in accordance with embodiment 1;

FIG. 3 is an exploded view of the structure of a PCB board and a base without a mounting coil in example 1;

fig. 4 is a schematic structural view of the base in embodiment 1 without the coil, the PCB, the magnet fixing frame, the upper magnetic conductive sheet, and the coil support;

FIG. 5 is a schematic view showing the structure of a core mount in embodiment 1;

FIG. 6 is a bottom view of the upper cover in embodiment 1;

FIG. 7 is a schematic view showing the structure of a self-resetting self-generating switch of embodiment 2 without mounting a top cover, a coil and a PCB;

FIG. 8 is a schematic view of the partially exploded structure of FIG. 7;

fig. 9 is a schematic view of the combination of the magnet holder, two magnetic conductive plates and the magnet according to embodiment 2;

fig. 10 is a schematic structural diagram of a self-reset switch of embodiment 3 without an upper cover, a coil and a PCB.

Wherein: the magnetic conductive plate comprises a base 1, an upper cover 2, a coil 3, a PCB 4, a magnetic conductive sheet 5, a reset spring 6, a button 7, an iron core 8, a guide rod 9, a push plate 10, a hinge shaft 11, a catching groove 12, a lower limiting hook 13, an upper limiting hook 14, a guide plate 15, a limiting hole 16, a first barb 17, an iron core mounting frame 18, an iron core limiting groove 19, a fixing plate 20, a second barb 21, a third barb 22, a magnet fixing frame 23, a magnet 24, a second mounting groove 25, a first mounting groove 26, a third mounting groove 27, a through hole 28, a coil support 29, a connecting rod 30, a torsion spring connecting part 6-1, a torsion spring fixing frame 6-2 and a torsion spring fixing column 6-3.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and grasped.

Example 1:

as shown in fig. 1 to 6, the press self-resetting self-generating switch disclosed in this embodiment includes a base 1 and an upper cover 2, which are mutually matched, a coil 3, a PCB 4, two magnetic conductive plates 5 and a reset spring 6 which are vertically spaced and parallel to each other are disposed in the base 1, a magnet 24 which is vertically matched with the magnetic conductive plates 5 is disposed between the two magnetic conductive plates 5, the two magnetic conductive plates 5 are fixed on the upper and lower sides of a magnet fixing frame 23, the coil 3 is sleeved outside an iron core 8, one end of the iron core 8 extends into the space between the two magnetic conductive plates 5 and is correspondingly matched with the magnet 24, the other end of the iron core 8 is fixed in the base 1, two guide rods 9 are disposed in the base 1, two ends of the magnet fixing frame 23 are respectively sleeved outside the guide rods 9, one reset spring 6 is sleeved outside the guide rods 9 below the magnet fixing frame 23, a button 7 is disposed on the upper cover, a push plate 10 which is abutted against the magnet fixing frame 23 and can drive the magnet fixing frame 23 to move downwards when the button 7 is pressed is arranged below the button 7, the coil 3 is used for generating current to realize power generation, and the PCB 4 is used for receiving the power generated by the coil 3 and then transmitting a control signal.

For convenience of operation, a hinge shaft 11 is arranged on one side of the base 1, a catching groove 12 which is rotatably connected to the hinge shaft 11 is arranged in the upper cover 2, a lower limiting hook 13 is arranged on the other side of the base 1, an upper limiting hook 14 which is mutually buckled with the lower limiting hook 13 is arranged in the upper cover 2, and the button 7 and the upper cover 2 are integrally formed.

In order to limit the movable position of the magnet fixing frame 23 and avoid the later generation failure caused by the fact that the magnet fixing frame is separated from the guide rod 9 when the magnet fixing frame is reset, a guide plate 15 is arranged in the base 1 around the magnet fixing frame 23, a limit hole 16 for installing the magnet fixing frame 23 is formed by matching the guide plates 15 around, the guide rod 9 is arranged in the limit hole 16, first barbs 17 for preventing the magnet fixing frame 23 from falling off the guide rod 9 are arranged on the guide plates 15 at two symmetrical sides, by arranging the first barbs 17 at two sides, once the magnet fixing frame 23 is clamped in the limiting hole 16, in time, under the action of the spring, the magnet fixing frame 23 is not easy to be separated from the limiting hole 16, and the deflector 15 all around plays the guide effect, avoids magnet mount 23 to appear the problem of skew when reciprocating, finally further guarantees to be stability.

For ease of installation, the coil 3 is fixed outside the core 8 by a coil support 29.

In order to fix the iron core, an iron core mounting frame 18 is arranged on one side in the base 1, an iron core limiting groove 19 is arranged on the other side in the base 1, and the iron core 8 is clamped between the iron core mounting frame 18 and the iron core limiting groove 19.

In order to limit the iron core and avoid influencing the power generation efficiency, the iron core mounting frame 18 comprises a fixing plate 20 and second barbs 21 positioned on two sides of the fixing plate 20, third barbs 22 are arranged outside the iron core limiting groove 19, the lower surface of the iron core 8 abuts against the fixing plate 20 and the iron core limiting groove 19, and two sides of the upper surface of the iron core 8 abut against the second barbs 21 and the third barbs 22 respectively.

For convenient installation, a first installation groove 26, a second installation groove 25 and a third installation groove 27 which are mutually communicated are sequentially arranged on the magnet fixing frame 23 from top to bottom, the upper magnetic conductive sheet 5 is inserted into the first installation groove 26, the magnet 24 is inserted into the second installation groove 25, the lower magnetic conductive sheet 5 is inserted into the third installation groove 27, the first installation groove 26, the second installation groove 25 and the third installation groove 27 form an I-shaped structure, one end of the iron core 8 is inserted into the second installation groove 25 and has a distance with the upper and lower magnetic conductive sheets 5, through holes 28 matched with the guide rods 9 are further arranged on two sides of the magnet fixing frame 23, through the structure, the magnet 24 is inserted into the second installation groove 25 and is abutted against the upper and lower magnetic conductive sheets 5, one end of the iron core 8 is inserted into the second installation groove 25 and is abutted against the side edge of the magnet 24, then when the magnet fixing frame 23 is driven to move up and down, will drive inside two magnetic conduction pieces 5 and magnet 24 also synchronous up-and-down motion, and produce the magnetic flux with the one end of iron core 8, and the in-process magnetic flux of up-and-down motion changes and produces the purpose that the electricity generation was realized to the electric current, simultaneously in order to guarantee that magnet mount 23 can normal up-and-down motion, avoid being blocked by inserted iron core 8, consequently, the upper and lower needs of iron core 8 to keep apart from with upper and lower magnetic conduction piece 5 or at least with the magnetic conduction piece 5 of one side and keep apart from, consequently, need guarantee that second mounting groove 25 has and can let magnet mount 23 when being pressed, can let iron core 8 have the space of dodging relatively.

Further, improve water-proof effects, upper cover 2 closes base 1 lid in upper cover 2.

Through the structural design, the PCB 4 on the product is firstly in communication connection with the corresponding equipment, and the way of how the PCB 4 is in communication connection with the equipment belongs to the conventional technology in the field, so detailed description is not needed, when the product is required to work to realize power generation, the button 7 is pressed at the moment, when the button 7 is pressed, because one end of the lower cover 2 is rotatably connected on the hinge shaft 11 through the lower limit hook 13, the button position of the lower cover 2 can rotate around the hinge shaft 11 and move downwards, at the moment, the magnet fixing frame 23 is moved downwards and extrudes the reset spring 6 through the push plate 10, at the moment, the two magnetic conductive sheets 5 and the magnet 24 between the two magnetic conductive sheets 5 can be synchronously driven to move downwards, when the hand is released, the magnet fixing frame 23 is moved upwards to realize reset under the action of the reset spring 6 until the two sides of the magnet fixing frame 23 are abutted against the first barbs 17 on the two sides to realize the limiting effect on the magnet 23, the problem of unstable power generation in the later period caused by the fact that the power generation is separated from the guide rod 9 due to continuous upward movement is avoided, therefore, in the point-pressing manner, the magnet fixing frame 23 drives the magnet 24 inside to reciprocate up and down, so that the magnetic flux between the two magnetic conductive sheets 5 can be changed to influence the iron core 8, and the iron core 8 can generate electric energy, then the signal is transmitted to the PCB 4, finally the PCB 4 drives the circuit of the switch to start working and sends out a control signal, meanwhile, under the action of the two reset springs and the guide rod, the magnet fixing frame 23 has two side guide effects when moving up and down, finally ensures the stability of the movement and also ensures the rationality of the installation, therefore, compared with the prior art, the overall structure is simpler, the installation is more convenient, and the resetting is more stable through the matching of the guide rods 9 on the two sides and the springs.

Example 2:

as shown in fig. 7 to 9, the self-reset switch disclosed in this embodiment includes a base 1 and an upper cover 2, which are engaged with each other, a coil 3, a PCB 4, two magnetic conductive plates 5 and a reset spring 6, which are spaced from each other and parallel to each other, are disposed in the base 1, a magnet 24 is disposed between the two magnetic conductive plates 5 and is engaged with the magnetic conductive plates 5, the two magnetic conductive plates 5 are fixed on the upper and lower sides of a magnet holder 23, the coil 3 is sleeved outside the iron core 8, one end of the iron core 8 extends between the two magnetic conductive plates 5 and is engaged with the magnet 24, the other end of the iron core 8 is fixed in the base 1, a button 7 is disposed on the upper cover 2, a push plate 10 is disposed below the button 7 and is abutted against the magnet holder 23 and is capable of driving the magnet holder 23 to move downward when the button 7 is pressed, a connecting rod 30 is rotatably connected to the base 1 is disposed, the return spring 6 is a pagoda-shaped spring or a double torsion spring structure which can reset the magnet fixing frame 23, when the return spring 6 is a pagoda-shaped spring, the return spring is abutted between the lower part of the magnet fixing frame 23 and the base 1, because the structure of the upper cover 2 in the embodiment is completely the same as that of the embodiment 1, the structure display of the upper cover 2 is omitted in fig. 7, the specific structure thereof can refer to the structure disclosed in the embodiment 1, the embodiment is different from the embodiment 1 in the structure of the return spring, the whole working principle thereof can also refer to the embodiment 1, the difference is that when the product is required to work to realize power generation, the button 7 is pressed, when the button 7 is pressed, because one end of the lower cover 2 is rotatably connected on the hinge shaft 11 through the lower limit hook 13, the button position of the lower cover 2 can rotate around the hinge shaft 11 and move downwards, at this moment, the magnet fixing frame 23 moves downwards and extrudes the reset spring 6 through the push plate 10, meanwhile, the connecting rod 30 can be rotatably connected in the base 1, the two magnetic conductive sheets 5 and the magnet 24 between the two magnetic conductive sheets 5 can be synchronously driven to move downwards, and when the hand is opened, the magnet fixing frame 23 moves upwards to realize resetting under the action of the reset spring 6 until two sides of the magnet fixing frame 23 abut against the first barbs 17 on two sides to realize the limiting effect on the magnet fixing frame 23.

Example 3:

as shown in fig. 10, in the self-resetting self-generating switch of this embodiment, the reset spring 6 is a double-torsion spring, a torsion spring connecting portion 6-1 is integrally formed between two torsion springs of the double-torsion spring, torsion spring fixing brackets 6-2 located at two sides of the iron core 8 are disposed in the base 1, a torsion spring fixing post 6-3 for sleeving a corresponding torsion spring in the double-torsion spring is disposed at an outer side of each torsion spring fixing bracket 6-2, the torsion spring connecting portion 6-1 abuts against a lower surface of the magnet fixing bracket 23, and after the magnet fixing bracket 23 is pressed, the double-torsion spring is in a twisted state. The general structure of the present embodiment is the same as that of embodiment 1, except that the structure adopted for resetting is different, when the product is required to work to realize power generation, the button 7 is pressed, when the button 7 is pressed, since one end of the lower cover 2 is rotatably coupled to the hinge shaft 11 through the lower limit hook 13, the button position of the lower cover 2 is rotated about the hinge shaft 11 to move downward, at which time the magnet holder 23 is moved downward by the push plate 10 and presses the torsion spring connecting portion 6-1, at the same time, the connecting rod 30 is connected in the base 1 in a rotating way, and can synchronously drive the two magnetic conductive sheets 5 and the magnet 24 between the two magnetic conductive sheets 5 to move downwards, when the hand is opened, the torsion spring connecting part 6-1 is reset under the action of the torsion springs at the two sides, the magnet fixing frame 23 moves upwards to realize reset, and the magnet fixing frame 23 is limited by the two sides of the magnet fixing frame 23 abutting against the first barbs 17 at the two sides.

Of course, the above is only a specific application example of the present invention, and the protection scope of the present invention is not limited at all. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a press from spontaneous electric switch of reset formula, includes base (1) and upper cover (2) that mutually support, be equipped with coil (3), PCB board (4), two upper and lower interval distribution and magnetic conductive plate (5) and reset spring (6) that are parallel to each other in base (1), be equipped with between two magnetic conductive plate (5) about respectively with magnetic conductive plate (5) complex magnet (24), its characterized in that: two magnetic conductive sheets (5) are fixed on the upper portion and the lower portion of a magnet fixing frame (23), a coil (3) is sleeved outside an iron core (8), one end of the iron core (8) extends between the two magnetic conductive sheets (5) and is correspondingly matched with a magnet (24), the other end of the iron core (8) is fixed in a base (1), two guide rods (9) are arranged in the base (1), two ends of the magnet fixing frame (23) are respectively sleeved outside the guide rods (9), one reset spring (6) is sleeved outside the guide rods (9) below the magnet fixing frame (23), a button (7) is arranged on an upper cover (2), and a push plate (10) which is abutted against the magnet fixing frame (23) and can drive the magnet fixing frame (23) to move downwards when the button (7) is pressed is arranged below the button (7).

2. Self-generating switch according to claim 1, characterized in that: be equipped with articulated shaft (11) in base (1) one side, be equipped with catching groove (12) of rotation connection on articulated shaft (11) in upper cover (2), be equipped with down spacing hook (13) at base (1) opposite side, be equipped with in upper cover (2) with the last spacing hook (14) of the mutual lock of lower spacing hook (13), button (7) and upper cover (2) integrated into one piece.

3. Self-generating switch according to claim 2, characterized in that: all be equipped with a deflector (15) around for magnet mount (23) in base (1), cooperate between deflector (15) all around to constitute a spacing hole (16) that is used for installing magnet mount (23), guide bar (9) arrange in spacing hole (16), be equipped with on the deflector (15) on symmetry both sides and prevent that magnet mount (23) deviate from first barb (17) from guide bar (9).

4. Self-generating switch according to claim 3, characterized in that: the coil (3) is fixed outside the iron core (8) through a coil bracket (29).

5. Self-generating switch according to claim 4, characterized in that: one side in base (1) is equipped with iron core mounting bracket (18), and the another side in base (1) is equipped with iron core spacing groove (19), iron core (8) card is between iron core mounting bracket (18) and iron core spacing groove (19).

6. Self-generating switch according to claim 5, characterized in that: iron core mounting bracket (18) including fixed plate (20), be located second barb (21) of fixed plate (20) both sides, be equipped with third barb (22) in the outside of iron core spacing groove (19), the lower surface and fixed plate (20), iron core spacing groove (19) of iron core (8) offset, the both sides of iron core (8) upper surface offset with second barb (21) and third barb (22) respectively.

7. Self-generating switch according to claim 6, characterized in that: be equipped with first mounting groove (26), second mounting groove (25) and third mounting groove (27) that communicate each other in proper order from the top down in magnet mount (23), in magnetic conduction piece (5) of top inserted first mounting groove (26), magnet (24) insert in second mounting groove (25), in magnetic conduction piece (5) of below insert third mounting groove (27), first mounting groove (26), second mounting groove (25) and third mounting groove (27) constitute "worker" style of calligraphy structure, just iron core (8) one end insert in second mounting groove (25) and have the interval with magnetic conduction piece (5) from top to bottom, still be equipped with in magnet mount (23) both sides with guide bar (9) complex through hole (28), upper cover (2) close base (1) lid in upper cover (2).

8. A press self-reset self-generating switch comprises a base (1) and an upper cover (2) which are matched with each other, wherein a coil (3), a PCB (4), two magnetic conductive sheets (5) which are distributed at intervals from top to bottom and are parallel to each other and a reset spring (6) are arranged in the base (1), magnets (24) which are matched with the magnetic conductive sheets (5) from top to bottom are arranged between the two magnetic conductive sheets (5), the two magnetic conductive sheets (5) are fixed on the top and the bottom of a magnet fixing frame (23), the coil (3) is sleeved outside an iron core (8), one end of the iron core (8) extends into the space between the two magnetic conductive sheets (5) and is correspondingly matched with the magnets (24), the other end of the iron core (8) is fixed in the base (1), a button (7) is arranged on the upper cover (2), a push plate (10) which is abutted against the magnet fixing frame (23) and can drive the magnet fixing frame (23) to move downwards when the button (, the method is characterized in that: a connecting rod (30) rotatably connected to the base (1) is arranged on the side edge of the magnet fixing frame (23), and the reset spring (6) is of a pagoda-shaped spring or double-torsion spring structure capable of resetting the magnet fixing frame (23).

9. A push-on self-resetting self-generating switch according to claim 8, wherein: when the return spring (6) is a pagoda-shaped spring, the return spring is abutted between the lower part of the magnet fixing frame (23) and the base (1).

10. A push-on self-resetting self-generating switch according to claim 8, wherein: the reset spring (6) is a double-torsion spring, a torsion spring connecting portion (6-1) is integrally formed between two torsion springs of the double-torsion spring, torsion spring fixing frames (6-2) located on two sides of the iron core (8) are arranged in the base (1), a torsion spring fixing column (6-3) used for being sleeved with the corresponding torsion spring in the double-torsion spring is arranged on the outer side of each torsion spring fixing frame (6-2), the torsion spring connecting portion (6-1) is abutted to the lower surface of the magnet fixing frame (23), and the double-torsion spring is in a twisting state after the magnet fixing frame (23) is pressed.

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