JP5757621B2 - Valve drive device with microswitch in water tap - Google Patents

Description

The present invention relates to a drive mechanism that opens and closes a valve by converting the rotational motion of a direct current motor into a linear motion in order to remotely control the water drain plug, and in particular, a switch using a microswitch that supplies and interrupts current to the direct current motor The present invention relates to a water drain valve driving device characterized by the structure of the device.

In cold regions, in order to prevent water pipes from freezing in winter, a water drain plug (for example, utility model registration No. 2513962), which is a device that discharges water in the pipes to the outside, has been conventionally used. In addition to manual operation, electric remote control with a DC motor is also performed.
FIG. 5 is a schematic view of the whole of a generally adopted apparatus using electric remote control applied to a water drain plug. Here, the drain plug V is configured by a valve unit B, a transmission unit T including an operation shaft 21 and a valve body 22, and a valve driving device D incorporating a DC motor, and is operated remotely by the valve driving device D and the code C. Board E is connected. A switch S0 is attached to the operation panel E. The water pipe P is extended from the valve part B of the water drain plug V, and a faucet is disposed at the end.
The operation of this device is as follows. When the switch S0 of the operation panel E is operated, the valve driving device D works to open and close the valve part B. When the valve part B is opened, water is discharged from the faucet through the water pipe P, and the valve part V is When closed, the water in the water pipe P is discharged into the ground via the valve part B.
By this apparatus, the water supply work to the water supply pipe and the drainage work are further simplified.

In the above-described device using electric remote control, the present applicant has previously proposed a microswitch operating body used in a valve drive device incorporating a DC motor in Patent Document 1 (Japanese Utility Model Publication No. 7-45858). did.

In the above-mentioned prior device, the rotary motion of a small DC motor that can be rotated forward, stopped, and reversed by two micro switches having a lever is decelerated and converted into linear motion, and the valve is supplied with water by linear motion of the drive shaft or In the valve drive mechanism for draining, internal teeth are also formed on the inner periphery of the recesses on both sides of the spur gear meshing with the teeth carved on a part of the drive shaft, and there are protrusions in the radial direction and the circumference The operation body of the micro switch having a structure in which a disc with a notch is fitted in the recesses on both side surfaces of the spur gear is characterized.
According to the preceding “operation body”, when the switch S0 of the operation panel E is operated, the direct current motor is driven, and the valve inside the drain plug connected through the member connected to the direct current motor is in one state. When the motor starts to move and moves by a predetermined amount, the current to the DC motor is cut off and the driving is stopped, and accordingly, the drain valve is also stopped in another state.
And by adopting a micro switch with a lever, the contact is turned on and off by mechanical movement that is not coaxial with the contact, such as a structure in which the protrusion of the disk pushes the contact of the switch indirectly via the lever of the micro switch It was possible to adjust the position easily.

No. 7-45858

In the above-described prior device, the configuration is simple and the assembly is facilitated. However, because the drive shaft configured as the operating body in the valve drive device uses a metal material such as brass due to its strength, the drive shaft is complicated to provide teeth for meshing with the spur gear. Necessitates cutting. In addition, the micro switch with a lever has the merit of adopting a mechanical motion that is not coaxial with the contact, as described above, but it is structurally suitable for incorporating a spur gear or a micro switch. Therefore, it is necessary to reduce the size of the valve driving device itself, including facilitating manufacture and strengthening of the structure.
In view of the above, it is possible to eliminate the structure of the operating body using a spur gear, which requires the cutting of teeth to mesh with the spur gear on the drive shaft, and cope with the cutting of grooves. Further, the above-mentioned problem is solved by adopting a switch actuating member having a claw and a projecting portion capable of suppressing the processing cost and using an L-shaped bracket having a mounting hole for mounting two micro switches. Is.

(Claim 1)
The present invention includes a cylindrical casing having a slit and a guide groove in the circumferential surface axial direction, a bracket fixing surface on the outer surface adjacent to the slit, and attached to the upper end of the valve body of the water drain plug.
A drive shaft which is screwed into a feed screw of a valve drive device capable of forward / reverse rotation / stop control by a direct current motor and which is non-rotatable and slidable in the cylindrical casing and which operates the operation shaft of the drain plug; ,
An operation member having a projection that operates in conjunction with the drive shaft and operates the microswitch while being guided by the guide groove of the cylindrical casing;
An L-shaped bracket having an attachment plate surface attached to a fixed surface of the cylindrical casing and an upright plate surface erected at a right angle from an end portion of the attachment plate surface, and the actuating member on the attachment plate surface An L-shaped bracket having a longitudinal slit hole that allows movement of the protruding portion and a longitudinal mounting hole on the standing plate surface;
The mounting hole of the L-shaped bracket standing plate surface includes a micro switch with a contact that does not have two levers that are attached by setting the linear movement of the drive shaft in accordance with the opening and closing of the valve,
Each contact of the microswitch is operable by a protrusion of an operating member guided by a cylindrical casing, and at that time, an L-shaped bracket having a predetermined thickness for restricting a switch pressing amount between the operating member and the microswitch. A valve driving device for a water drain with a switch device in which a mounting plate surface is interposed;
I will provide a.

(Claim 2)
The present invention comprises a structure that further embodies the invention of claim 1,
In order to properly reduce the rotational motion of the DC motor that can be rotated forward, stop, and reverse, and convert it to linear motion, a feed screw and a valve drive device having a drive shaft that is screwed to the feed screw are provided. A water drain valve drive device that is opened and closed by an operating shaft,
(A) In order to control the opening and closing of the water drain plug, the valve drive device is mounted on a valve casing and assembled and mounted on the cylindrical casing to control linear movement of the drive shaft. Two micro switches that are set according to opening and closing, an operating member that operates these micro switches in conjunction with the drive shaft, and an L-shape that is attached to the cylindrical casing by mounting the two micro switches as a set And a switch device including a bracket.
(B) In the switch device, the cylindrical casing has a DC motor and a reduction gear fixedly mounted on one end side thereof so as to be able to transmit the rotation by reducing a feed screw member therein, and on the other end side. The feed screw member is screw-fitted and provided with the drive shaft that is inserted in the cylindrical casing while being rotated and protruded from the other end, and further, an annular groove is formed on the upper outer periphery of the drive shaft,
(C) Further, the cylindrical casing has a longitudinally long claw insertion slit in the axial direction, a guide groove for operating member guidance, and a flat bracket fixing surface adjacent to the longitudinal direction of the guide groove,
(D) The actuating member has a claw that fits into the annular groove of the drive shaft, and has a sliding guide surface that is guided along the slit and guide groove of the cylindrical casing, and each of the operating members on the upper surface. It has a protrusion that presses the micro switch and is provided so as to be movable in the axial direction together with the drive shaft.
(E) When the L-shaped bracket is fixed to the bracket fixing surface of the cylindrical casing, the slit hole is positioned so as to overlap in the same direction as the slit and the guide groove, and the L-shaped bracket is inserted through the fixing hole. The two micro switches without levers can be actuated by actuating members in the longitudinally long mounting holes formed on the other outwardly facing plate surface perpendicular to the plate surface on the slit hole side. Provided is a valve driving device for a water faucet, which is mounted in series at an appropriate position and a microswitch is cantilevered on an L-shaped bracket.

(Claim 3)
Further, according to the present invention, as a countermeasure against overload absorption at the time of operation of the switch device, the L-shaped bracket in the valve drive device is a plate material made of a material having a spring property. Provide with the device.

As described above, according to the present invention, the structure of the operating body using the spur gear as in the prior art is abolished, and the switch device structure is configured by the operating member having the claw and the protrusion, so Since it is not necessary to cut the teeth for meshing and only the grooves are cut, the processing cost can be reduced.
In addition, in the present invention, a micro switch having no lever is employed, and a slit hole for sliding an operating member on one surface and two micro switches not having a lever on the other surface that is perpendicular to the same are mounted. By using an L-shaped bracket having a mounting hole to be mounted, it has a mounting hole that can be arranged in parallel with the guide groove of the cylindrical casing, so two general-purpose microswitches are connected in series at appropriate positions. It can be mounted appropriately, the valve drive device itself can be miniaturized, and the cost can be reduced.
Furthermore, by adopting a structure in which an L-shaped bracket is interposed between the microswitch and its operating member, the amount of pushing of the microswitch into the contact point of the microswitch by the operating member as a slide-type switch can be made constant.

Here, for the L-shaped bracket, if this is a plate material having a spring property, even if an external force that is pushed to the contact side is applied by the operating member, the external force is Since the L-shaped bracket itself can be released to the outside with the fixed hole portion of the L-shaped bracket supported by the cantilever as a fulcrum, the load on the microswitch is not applied more than necessary. Breakage of the switch and wear and breakage of the operating member can be prevented, and as a result, the life of the switch operating portion can be extended.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic external view of a valve drive device D including an embodiment of the switch device S of the present invention, and FIG. 2 shows a partial cross section and a mounting structure of the valve drive device and the switch device S. 2A is a cross-sectional view mainly showing a section of the switch device partly viewed from the arrow along the YY line in the axial direction of FIG. 1, and FIG. 2B is a cross-sectional view of FIG. Sectional drawing of the switch apparatus in a horizontal direction XX position is each shown.
In FIG. 1, the valve drive device D is provided with a gear G as a speed reduction transmission mechanism attached to the upper end of a cylindrical casing 11, a DC motor M connected thereto, and a feed screw 10 as an output shaft of the gear G. Further, as shown in FIG. 2B, a drive shaft 12 is assembled to the feed screw 10 so as to be non-rotatable and slidable in the cylindrical casing 11. Further, at the lower part of the drive shaft 12 shown in FIG. 2 (a), as shown in FIG. 5, a water drain plug is connected via a transmission portion T including an operation shaft 21 connected to the water drain plug V and a valve body 22. It is connected to the valve part B of V.
Here, the switch device S of the present invention mainly includes a cylindrical casing 11 (hereinafter referred to as “casing”), a drive shaft 12, an operating member 13, an L-shaped bracket 14, and a micro that does not include two levers. It is configured by switches 15A and 15B.
As described above, the valve drive device D including the switch device S of the present invention includes, in addition to the above-described members, the DC motor M used in the prior art, the gear G for appropriately reducing the rotation of the DC motor M, and the gear G A feed screw 10 is provided for transmitting the rotation to the drive shaft 12 in a rotational motion. In addition to this, as shown by a dotted line in FIG. 1, a cover 30 covering the entire apparatus and a manual handle 20 as auxiliary means for the electric valve driving device are provided.

(Description of casing 11 and drive shaft 12 of switch device S)
In the switch device S, the linear motion of the drive shaft 12 screwed on the feed screw 10 will be described with reference to FIGS. The casing 11 is provided with an axial slit 11a and a guide groove 11b on its peripheral wall, and a fixing surface 11c for fixing one surface of the L-shaped bracket 14 on the outer surface.
Further, the drive shaft 12 is assembled in the casing 11 so that the drive shaft 12 can be inserted. As shown in FIG. 2B, for example, the hexagonal drive shaft 12 is inserted into the hexagonal insertion port in the casing 11. . As shown in FIG. 2A, the upper end of the drive shaft 12 in the figure has a female screw 12b, and a feed screw 10 is screwed to the female screw 12b. Accordingly, the rotation from the DC motor M is appropriately decelerated and converted into a linear motion of the drive shaft 12, and the linear motion is transmitted to the valve portion B in the drain plug V shown in FIG. 22 is connected to the valve part B of the water drain plug V via a transmission part T including 22. In this case, the drive shaft 12 and the operation shaft 21 can be forcibly moved up and down by pin coupling. Further, when the valve portion B is of a spring return type valve type, the drive shaft 12 and the operation shaft 21 are configured to abut on the end face, and the operation shaft 21 is pushed down against the spring by the drive shaft 12, The present invention can be applied to a structure in which the drive shaft 12 is pulled back and the operation shaft 21 is pushed up by a spring.
In any case, the vertical movement of the drive shaft 12 converted into the linear motion is transmitted to the valve portion B in the drain plug V shown in FIG.
In addition, although the drive shaft 12 gave the example which made the outer shape hexagon according to the hexagonal insertion opening in the casing 11, it supposes that it is assembled in the casing 11 so that it cannot rotate and is slidable by using other rotation stopping means. There is no problem.

(Description of drive shaft 12 and actuating member 13 of switch device S)
Details of the switching device S will be described with reference to FIG. FIG. 3 is a perspective view showing the casing 11, the actuating member 13, the L-shaped bracket 14, the micro switches 15 </ b> A and 15 </ b> B, and the spacer 16 that can be added as necessary, as the constituent members of the switch device S of the present invention. It is.
As shown in FIG. 2, the drive shaft 12 is provided with an annular groove 12 a circumferentially at the upper portion thereof, and the operating member 13 is moved from the outside of the slit 11 a of the casing 11 to the claw 13 a of the operating member 13. Is attached to the inside of the annular groove 12a so that the claw 13a of the operating member 13 is fitted into the annular groove 12a. By fitting the annular groove 12a and the claw 13a, the operating member 13 is guided by the slit 11a and the guide groove 11b in conjunction with the drive shaft 12, and is assembled so as to be slidable up and down within the range.
Further, as shown in FIG. 3, the actuating member 13 has an L shape having a claw 13a, and an inclined surface 13c, a flat surface 13b, and an inclined surface 13g are provided on the side opposite to the protruding direction of the claw 13a. Protrusions 13h formed adjacent to each other are provided and have sliding guide surfaces 13d starting from positions lower than the side surface 13e and the flat surface 13b on both sides in the sliding direction.
The actuating member 13 is a pressing member that pushes the contacts 15a and 15b of the microswitches 15A and 15B. The actuating member 13 is provided with the inclined surfaces 13c and 13g. This is to prevent damage.

(Description of L-shaped bracket 14 of switch device S)
The L-shaped bracket 14 will be described with reference to FIGS. 2 and 3.
The L-shaped bracket 14 has a slit hole 14a for sliding the operating member 13 on one surface and a fixing hole 14b for fixing the L-shaped bracket 14 to the casing 11, and has a microscopic surface on the other surface standing upright at the corner. A mounting hole 14c for mounting the switches 15A and 15B is provided.
When attaching the L-shaped bracket 14 to the casing 11, the mounting member 13 is covered from above and attached from the outside, the protrusion 13 h of the operating member 13 is positioned in the slit hole 14 a, and the fixing hole The screw is fixed at 14b.

(Description of the microswitches 15A and 15B of the switch device S)
As shown in FIG. 2 and FIG. 3, two micro switches 15A and 15B are used which directly press the contact points 15a and 15b. In this case, unlike the above-described prior device, the levers The one without specifications is adopted. Since each of the micro switches 15A and 15B uses an L-shaped bracket 14 made of a plate material, the micro switches 15A and 15B can be mounted in series at appropriate positions in the mounting holes 14c, and can be disposed in parallel with the outer surface of the casing 11.
The mounting positions of the two micro switches 15A and 15B in the mounting hole 14c are mounted in consideration of the movement distance of the valve portion B of the water drain plug V shown in FIG.

The contact operation of the thus configured switch device S will be further described with reference to FIGS. The bottom surfaces of the micro switches 15A and 15B are attached in a state where they contact the surface 14d of the L-shaped bracket 14 except that the contacts 15a and 15b enter the guide holes 14a.
The microswitches 15A and 15B are operated by the sliding of the actuating member 13 interlocked with the drive shaft 12 so that the inclined surface 13c or the inclined surface 13g reaches the contact point 15a or 15b, and further moves while pushing the contact point. It operates when it reaches the required pushing amount.
In addition, the pushing amount of the contact member 15a, 15b is limited by the regulating surface 13f of the working member 13 so that the contact point is not loaded. Even if the inclined surface 13c or 13g may pass through the contact point 15a or 15b, the amount of pressing the contact points 15a and 15b on the flat surface 13b adjacent to the inclined surface 13c or 13g becomes the maximum pressing amount. This is never exceeded.
Further, by adopting a structure in which an L-shaped bracket 14 is interposed between the microswitches 15A and 15B and the operation member 13, the facing surfaces of the microswitches 15A and 15B are not in direct contact with the operation member 13. As a result, the operation without interference between the two members is guaranteed, so that the two members can be prevented from being damaged. From the above, the actuating member 13 can slide stably along the L-shaped bracket 14, and the pushing amount of the contacts 15a and 15b by the actuating member 13 can be made constant.

Further, when the L-shaped bracket 14 is made of a stainless steel material having a spring property, even if an external force is applied to the actuating member 13 to the contact 15a, 15b side, Since the L-shaped bracket 14 itself escapes outward with the fixing hole 14b portion fixed to the screw of the bracket 14 as a fulcrum, there is no load that damages the contacts 15a and 15b.

(Operation of switch device S)
Next, the operation of the switch device S according to the present invention will be described with reference to FIG. 4A is a cross-sectional view showing the state of the switch device S when the valve portion B of the water drain plug V is in one open / closed state, and FIG. It is sectional drawing which shows the state of the switch apparatus S when B is holding the other closed / open state,
4A, the drive shaft 12 in the casing 11 stays upward, and the upper inclined surface 13c of the actuating member 13 shown in FIG. 3 is pressing the contact 15a of the upper microswitch 15A. . In this state, it is assumed that the state of the water drain plug V connected to the switch device S is a water supply state (a state where water can be used).
In such a state of use, when there is a concern about water supply freezing in winter or the like, the switch S0 of the operation panel E connected to the valve drive device D using the switch device S of the present invention shown in FIG. Push. Then, a current flows through the direct current motor M in the valve drive device D and is started and decelerated by the gear G. In FIG. 4A, the drive shaft 12 starts to linearly move downward in the figure.
Immediately after startup, the upper inclined surface 13c of the actuating member 13 that has been pushing the contact 15a of the upper micro switch 15A is separated from the contact 15a, and the actuating member 13 moves downward while interlocking with the drive shaft 12.
When moved by a predetermined amount, the lower inclined surface 13g of the actuating member 13 shown in FIG. 3 comes into contact with the contact 15b of the lower microswitch 15B and gradually pushes in the contact 15b.
It further moves, finally reaches the required pushing amount, the lower micro switch 15B is activated, the current supplied to the DC motor M is cut off, and the movement of the drive shaft 12 stops.
At this time, the valve portion B of the drain plug V connected to the drive shaft 12 via the operation shaft 21 of the transmission portion T also descends in conjunction with it, stopping the supply flow of water from the upstream side of the drain plug V, The water in the downstream water pipe P is discharged out of the water pipe through the water drain plug V, so-called drained state. (State of FIG. 4B)

When it is desired to return the water tap V to the water supply state again from the water drained state in FIG. 4B, when the operation switch S0 of the operation panel E shown in FIG. However, a current in the opposite direction flows. For this reason, this time, in the drained state in FIG. 4B, the drive shaft 12 starts to linearly move upward, and immediately after the activation, the contact 15b of the lower micro switch 15B has been pushed until FIG. The lower inclined surface 13g of the illustrated actuating member 13 moves away from the contact 15b, and the actuating member 13 moves upward while interlocking with the drive shaft 12.
When the predetermined amount of movement is reached, the upper inclined surface 13c of the actuating member 13 comes into contact with the contact 15a of the upper micro switch 15A and gradually pushes in the contact 15a. When the required push amount is finally reached, the upper micro switch 15A is reached. Is activated, the current supplied to the DC motor M is cut off, and the drive shaft 12 stops moving. (State of FIG. 4A)

The flat surface 13b of the actuating member 13 in the switch device S of the present invention has a certain length in the up and down direction in which it can move as shown in FIG.
This is not particularly touched on the valve driving device D using the switch device S of the present invention, but manual operation is performed so that the drain plug V can be operated via the valve driving device D in the event of a power failure. It also has functions that can be performed. This is the manual handle 20 shown in FIG. During manual operation, the operating member 13 moves slightly more than the specified distance, but the flat surface 13b of the operating member 13 has a certain length as a margin.

Supplementally, the control of the valve drive device having the switch device according to the present invention is the same as that of the circuit board incorporating the control circuit disclosed in the above-mentioned prior art document (Japanese Utility Model Publication No. 7-45858) by the applicant. The thing is adopted and incorporated in the cover 30 of the valve drive device D.

It is an external view of the valve drive device which has the switch apparatus S which shows one Example of this invention. 1A and 1B are cross-sectional views of the switch device S, where FIG. 1A is a cross-sectional view of the switch device S as viewed along the axial direction of the YY line of FIG. It is a partial sectional view seen from a line. It is an external appearance perspective view of the assembly component which decomposed | disassembled switch apparatus S of this invention. The operation state of the switch apparatus S of this invention is shown, (a) is sectional drawing which shows the state when the valve part of a water draining plug is holding one state, (b) is the valve part of a water draining plug It is sectional drawing which shows a state at the time of hold | maintaining the other state. The whole schematic which applied the device by electric remote control to the water tap is shown.

V Water drain plug B Valve portion T Transmission portion D Valve drive device E Operation panel S0 Operation switch S Switch device C Code P Water pipe M DC motor G Gear 10 Feed screw 11 Cylindrical casing 11a Slit 11b Guide groove 11c Fixed surface 12 Drive shaft 12a annular groove 12b female screw 12c pin hole 13 actuating member 13a claw 13b flat surface 13c inclined surface 13d sliding guide surface 13e side surface 13f regulating surface 13g inclined surface 13h protrusion 14 L-shaped bracket 14a slit hole 14b fixing hole 14c mounting hole 14d Front surface 14e Back surface 15A, 15B Microswitch 15a, 15b Contact 16 Spacer 16a Slit hole 17 Screw 20 Manual handle 21 Operation shaft 22 Valve body 30 Cover

Claims (3)

A cylindrical casing having a slit in the circumferential surface direction and a guide groove, and a bracket fixing surface on the outer surface adjacent to the slit, and attached to the upper end of the valve body of the water drain plug;
A drive shaft which is screwed into a feed screw of a valve drive device capable of forward / reverse rotation / stop control by a direct current motor and which is non-rotatable and slidable in the cylindrical casing and which operates the operation shaft of the drain plug; ,
An operation member having a projection that operates in conjunction with the drive shaft and operates the microswitch while being guided by the guide groove of the cylindrical casing;
An L-shaped bracket having an attachment plate surface attached to a fixed surface of the cylindrical casing and an upright plate surface erected at a right angle from an end portion of the attachment plate surface, and the actuating member on the attachment plate surface An L-shaped bracket having a longitudinal slit hole that allows movement of the protruding portion and a longitudinal mounting hole on the standing plate surface;
The mounting hole of the L-shaped bracket standing plate surface includes a micro switch with a contact that does not have two levers that are attached by setting the linear movement of the drive shaft in accordance with the opening and closing of the valve,
Each contact point of the microswitch is operable by a protrusion of an operating member guided by a cylindrical casing, and at that time, an L-shaped bracket having a predetermined thickness for restricting a switch pressing amount between the operating member and the microswitch. A valve driving device for a water drain, comprising a switch device in which a mounting plate surface is interposed. In order to properly reduce the rotational motion of the DC motor that can be rotated forward, stop, and reverse, and convert it to linear motion, a feed screw and a valve drive device having a drive shaft that is screwed to the feed screw are provided. A water drain valve drive device that is opened and closed by an operating shaft,
(A) In order to control the opening and closing of the water drain plug, the valve drive device is mounted on a valve casing and assembled and mounted on the cylindrical casing to control linear movement of the drive shaft. Two micro switches that are set according to opening and closing, an operating member that operates these micro switches in conjunction with the drive shaft, and an L-shape that is attached to the cylindrical casing by mounting the two micro switches as a set And a switch device including a bracket.
(B) In the switch device, the cylindrical casing has a DC motor and a reduction gear fixedly mounted on one end side thereof so as to be able to transmit the rotation by reducing a feed screw member therein, and on the other end side. The feed screw member is screw-fitted and provided with the drive shaft that is inserted in the cylindrical casing while being rotated and protruded from the other end, and further, an annular groove is formed on the upper outer periphery of the drive shaft,
(C) Further, the cylindrical casing has a longitudinally long claw insertion slit in the axial direction, a guide groove for operating member guidance, and a flat bracket fixing surface adjacent to the longitudinal direction of the guide groove,
(D) The actuating member has a claw that fits into the annular groove of the drive shaft, and has a sliding guide surface that is guided along the slit and guide groove of the cylindrical casing, and each of the operating members on the upper surface. It has a projecting portion composed of an inclined surface and a flat surface for pressing the micro switch, and is provided so as to be movable in the axial direction together with the drive shaft.
(E) When the L-shaped bracket is fixed to the bracket fixing surface of the cylindrical casing, the slit hole is positioned so as to overlap in the same direction as the slit and the guide groove, and the L-shaped bracket is inserted through the fixing hole. The two micro switches without levers can be actuated by actuating members in the longitudinally long mounting holes formed on the other outwardly facing plate surface perpendicular to the plate surface on the slit hole side. A valve driving device for a water draining plug, wherein the microswitch is cantilevered on an L-shaped bracket when mounted in series at an appropriate position. The valve driving device for a water draining plug according to claim 1, wherein the L-shaped bracket in the valve driving device is made of a plate material having a spring property.

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