JP3686901B2 - Drain valve opening / closing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drain plug opening / closing device, and more particularly, to a drain plug opening / closing device used for opening / closing a drain plug attached to a water-circulating portion such as a bathtub or a basin of a wash basin using an electric motor as a drive source.
[0002]
[Prior art]
Patent Document 1 listed as a conventional example has a description of a drainage device in which a drain plug is switched between an open state and a closed state by manually pushing and pulling a release wire. In this drainage device, the release wire connected to the drain lid plug lid installed at the bottom of the tank body of the bathtub is also connected to the operation unit installed at a place where manual operation is possible, and the operation unit is operated manually. The stopper lid moves up and down to open and close the drain port.
[0003]
Further, Patent Document 2 listed as another conventional example has a description of a drainage device that opens and closes a plug lid of a drainage plug mechanism by remote control using an operation panel. In this drainage device, a pinion of a pinion / rack mechanism is fixed to a rotating shaft of an electric motor, a release wire that opens and closes a plug lid by performing a push-pull movement is connected to the rack, and the rack is meshed with the pinion. . The rotation of the pinion using an electric motor as a drive source is converted into a reciprocating movement of the rack to push and pull the release wire. Also, using a magnet and a member that reacts to the magnet as means for detecting the open or closed state of the plug lid (plug position detection means), attaching the electric motor to the moisture-proof case, and housing the release case with the release wire It is described that it is attached to an operation case, and the magnet and a member that reacts to the magnet are separately installed in a moisture-proof case at another location.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-99077 [Patent Document 2]
Japanese Patent Laid-Open No. 2002-54206
[Problems to be solved by the invention]
As in the above two conventional examples, it is well known that the drain plug is opened and closed using a release wire, and the pushing and pulling movement of the release wire is performed remotely using an electric motor as a drive source.
[0006]
However, as seen in Patent Document 2, when a drain plug is opened and closed by remote control, an electric motor as a drive source is attached, a moisture-proof case, a magnet that is a plug position detecting means, and a member that reacts to the magnet. When adopting the configuration of attaching to separate locations, when changing the existing manually operated drainage device using a release wire to the remote control method, the moisture-proof case and the plug position detecting means can be attached in separate steps. There is a problem that the work process becomes complicated due to the necessity.
[0007]
The present invention has been made in view of the above problems, and a case in which a drainage device in which a drain plug is opened and closed by a push-pull movement of a release wire, for example, is changed to a remote control type drainage device. However, an object of the present invention is to provide a drain plug opening / closing device excellent in workability of mounting a motor as a drive source and a plug position detecting means.
[0008]
Further, in the present invention, when a casing containing a linear body that is pushed and pulled, such as a relace wire, is communicated with the water passage of the drain plug, water flows from the water passage of the drain plug. To provide a drain plug opening / closing device that does not cause a situation in which water enters the inside of the drain plug opening / closing device attached to the casing and deteriorates its operation performance even if it flows backward into the casing. With the goal.
[0009]
Furthermore, the present invention provides a drainage that does not cause a situation in which water that has flowed back into the housing moves down the outer surface of the drainage plug device and drops after the assembly is simple and compact. An object is to provide a stopper opening and closing device.
[0010]
[Means for Solving the Problems]
In the drain plug opening and closing device according to the present invention, a rack of a pinion rack mechanism is connected to a linear body that switches a drain plug between an open state and a closed state by a push-pull motion, and the linear body is moved by a reciprocating motion of the rack. While being pushed and pulled, it is provided with plug position detecting means for detecting the position of the drain plug.
[0011]
The rack is configured to reciprocate through forward and reverse rotation of the pinion of the pinion / rack mechanism using an electric motor as a drive source, and the plug position detecting means is a magnet and a magnet that is a counterpart of the magnet. Combining with position detection sensor. The electric motor and the magnet position detection sensor are housed in a hollow case that is divided into a case body and a cover that is integrated and overlapped with an annular region on the outer periphery of the case body, and the hollow An annular joint between the case body and the cover of the case is sealed in a water-tight manner by an annular first sealing material, and a rotating shaft integral with the pinion is inserted through an insertion hole formed in the outer wall of the hollow case. Projecting to the outside of the hollow case, the gap between the rotating shaft and the hole wall surface of the insertion hole is watertightly closed with an annular second sealing material, and the rack is integrated with the hollow case. It is meshed with the pinion in a state of being reciprocably held by a rack holder provided on the outside, and the magnet is provided in the rack.
[0012]
According to this invention, the magnet of the stopper position detecting means is provided in the rack, the rack is held by the holder integrated with the hollow case, and the magnet position detection sensor which is the counterpart of the magnet is the hollow case together with the electric motor. And the hollow case is divided into a case main body and a cover integrated on the outer peripheral annular region of the case main body, so that the electric motor, the rack, and the plug position detecting means Can be assembled into one hollow case. Therefore, the drain plug opening / closing device can be provided as a single compact shape, and the assembly of the drain plug opening / closing device itself is also improved.
[0013]
Moreover, since the inside of the hollow case is sealed watertight by the first sealing material and the second sealing material, the performance of the magnet position detection sensor of the electric motor and plug position detecting means accommodated in the hollow case is infiltrated. The situation of being lowered by water does not occur.
[0014]
In the present invention, the hollow case is provided with a flange for accommodating the linear body so as to be capable of pushing and pulling, and for attaching a housing for accommodating a part of the hollow case in a form crossing the fitting portion. The flange is divided into a first part on the case body side and a second part on the cover side, and the outer side from the first sealing material to the overlapping part of the first part and the second part. A seal piece consisting of a projecting piece extending to is interposed and the overlapping portion is sealed in a water-tight manner, and this seal piece passes through the mating point to move the water moving path from the inside of the housing to the outside. It is desirable to cross.
[0015]
According to this, when the flange of the hollow case is attached to the casing, the situation where the water that flows back into the casing moves from the inside of the casing to the outside through the mating point of the hollow casing is caused by the seal piece. Be blocked. For this reason, a situation in which water that has traveled from the inside of the housing to the outside through the matching portion of the hollow case falls from the hollow case outside the housing does not occur.
[0016]
In the present invention, the rotating shaft of the pinion is connected to a worm fixed to the rotating shaft of the electric motor via a speed reduction mechanism formed of a gear train, and the rotating shaft of the electric motor, the worm, and the above It is desirable that the gear train be accommodated in the hollow case. According to this, since the speed reduction mechanism is housed in the hollow case together with the electric motor and the magnet position detection sensor, the drain plug opening / closing device can be provided as one compact form.
[0017]
In the present invention, the outer wall of the hollow case is provided with a cylindrical portion through which the signal cable of the electric motor is inserted and led out, and an end portion of a tube made of a watertight material covering the signal cable is provided in the cylindrical portion. It is desirable that the fitting portion with respect to the tubular portion of the tube is tightened by a heat-shrinkable tube contracted via an adhesive layer and the fitting portion is sealed in a watertight manner. According to this, the introduction portion of the signal cable in the hollow case is also sealed watertight.
[0018]
In the present invention, it is preferable that the case main body and the cover are provided with a rib-shaped pressing portion that clamps the cylindrical body of the electric motor and fixes the electric motor. According to this, since the vibration of the electric motor can be suppressed without assembling another part in the hollow case, it is possible to provide a drain plug opening / closing device that is less likely to generate vibration and abnormal noise with a reduced number of parts. become.
[0019]
According to the present invention, the rack holder is formed by a cylindrical portion that slidably holds the rack and allows its reciprocating movement, and the side wall that sandwiches the axis of the rack holder There is an opening in which the meshing location of the pinion and the rack is provided, and the other side wall has an opening formed by removing the entire length of the rack holder, and through the opening, the rack holder has an inside. It is desirable that a locking portion with the linear body to be inserted is provided at a position facing the opening of the rack. According to this, the operation of connecting the linear body to the latching portion of the rack can be easily and quickly performed using the opening of the rack holder.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
1 is a front view of a drain plug opening and closing device according to an embodiment of the present invention, FIG. 2 is a view taken along the arrow II in FIG. 1, and FIG. 3 is a view taken along the arrow III in FIG.
[0021]
In FIG. 1 to FIG. 3, reference numeral 1 denotes a rectangular and flat hollow case made of a resin molded body, which is divided into a case main body 2 and a cover 3, and brackets 31 provided at four corners of the cover 3 are inserted. The tightening screws 12 inserted into the holes 32 (see FIG. 6 or FIG. 16) are screwed into the screw holes 22 of the brackets 21 provided at the four corners of the case body 2 and tightened, whereby the case body 2 and the cover are covered. 3 are combined and integrated.
[0022]
4 is a back view of the case body 2, FIG. 5 is a back view of the case body 2 with an electric motor 6 and the like to be described later assembled, FIG. 6 is a back view of the cover 3, and FIG. 7 is a mounting structure of the electric motor 6. FIG. 8 is a sectional view of a portion taken along line VIII-VIII in FIG. FIG. 14 is an enlarged perspective view of the main part of the case body 2, and FIG. 15 is an enlarged perspective view of the main part of the first sealing material 41.
[0023]
As shown in FIG. 4, a substantially rectangular annular region on the outer periphery of the case body 2 is provided with an endless groove 23, and a first seal member 41 made of rectangular annular rubber is fitted into the groove 23 as shown in FIG. ing. A seal seat surface 33 is formed in a substantially rectangular shape on the outer periphery of the cover 3. In the state where the case main body 2 and the cover 3 are combined and integrated as described above, the first seal material 41 includes the groove bottom surface of the groove portion 23 on the case main body 2 side and the seal seat surface 33 on the cover 3 side. The annular joint portion 12 (see FIG. 2 or FIG. 3) formed by the case main body 2 and the cover 3 is pressed by the first sealing material 41 and sealed in a watertight manner.
[0024]
As shown in FIG. 1 to FIG. 3, the hollow case 1 is provided with an annular flange 5 in a form that crosses the annular joint portion 12 at a right angle. The flange 5 is divided into a U-shaped first portion 51 provided integrally with the case body 2 and a U-shaped second portion 56 provided integrally with the cover 3. Moreover, as shown in FIG. 4 or FIG. 5, the two end portions of the first portion 51 are formed thick, and the back surface of the thick portion 52 is flush with the outer peripheral back surface of the case body 2. . Further, as shown in FIG. 6, each of the two end portions of the second portion 56 is also formed thick, and the seal seat surface 58, which is the back surface of the thick portion 57, is formed on the outer peripheral back surface and the surface of the cover body 3. It is one. In addition, as shown in FIG. 4 or FIG. 14, the thick portion 52 of the first portion 51 is provided with a short recess 24 extending perpendicularly from the groove portion 23. Alternatively, as shown in FIG. 15, a sealing piece 42 formed by a protruding piece extending from the first sealing material 41 to the outside thereof is fitted. In the state where the case body 2 and the cover 3 are combined and integrated as described above, the seal piece 42 has a thickness on the bottom surface of the recess 23 of the thick portion 52 on the first portion 51 side and the thickness on the cover 3 side. By being elastically pressed by the seal seat surface 58 of the meat portion 57, the overlapping portion 50 (see FIG. 3) between the first portion 51 and the second portion 56 of the flange 5 is closed and sealed in a watertight manner. Further, at the overlapping portion 50, the tightening screw 53 inserted through the insertion hole 59 (see FIG. 6) of the thick portion 57 on the second portion 56 side is inserted into the screw hole 54 of the thick portion 52 on the first portion 51 side. Screwed and tightened. Therefore, even if the flange 5 is a resin molded body that is more flexible than metal, the tightening force by the tightening screw 53 is efficiently transmitted to the overlapping portion 50, and the water tightness of the overlapping portion 50 by the seal piece 42 is kept good. .
[0025]
As shown in FIG. 4, the case body 2 is provided with ribs 25 that define the installation location of the cylindrical body 61 of the electric motor 6, and the body 61 is accommodated in a section formed by the ribs 25. The bearing 63 of the rotating shaft 62 protruding from the front end surface of the body 61 is engaged with the recess 26 provided in the rib 25 in a fitting manner as shown in FIG. Further, as shown in FIG. 7, rib-shaped pressing portions 27 and 34 are provided on the case body 2 and the cover 3, respectively, and the body 61 is pinched by the pressing portions 27 and 34. With this configuration, the electric motor 6 is accommodated so as not to move in the hollow case 1, and vibrations of the electric motor 6 and the generation of abnormal noise associated with the vibration are suppressed by the pressing structure of the body 61 by the pressing portions 27 and 34. The
[0026]
As shown in FIG. 4, the outer wall of the case body 2 is provided with a circular insertion hole 28 on the side portion of the electric motor installation location. The insertion hole 28 has a circular annular stepped surface 29 on which a second seal material 45 made of a rubber O-ring shown in FIG. As shown in FIG. 8, a rotation shaft 72 of a pinion 71 of the pinion rack mechanism 7 to be described later is inserted into the insertion hole 28, and the clearance between the rotation shaft 72 and the hole wall surface of the insertion hole 28 is the above-described first. 2 is sealed watertight by the sealing material 45.
[0027]
Next, as shown in FIG. 5, a metal worm 8 is fixed to the rotating shaft 62 of the electric motor 6 by press-fitting. The rotating shaft 72 of the pinion 71 is connected to the worm 8 via a speed reduction mechanism 81 formed of a gear train. The speed reduction mechanism 81 includes a worm wheel 82 meshed with the worm 8, an intermediate large gear 84 meshed with a small diameter gear 83 concentrically integrated with the worm wheel 82, and a small diameter concentrically integrated with the intermediate diameter large gear 84. The final diameter large gear 86 is formed integrally with the rotary shaft 72 of the pinion 71 described above. In the illustrated speed reduction mechanism 81, the worm wheel 82 and the small diameter gear 83 are supported at both ends by a pair of bosses 87a and 87b provided on the case body 2 and the cover 3 shown in FIGS. The intermediate diameter large gear 84 and the small diameter gear 85 are rotatably supported by a metal support shaft (not shown), and the intermediate diameter large gear 84 and the small diameter gear 85 are the other provided in the case main body 2 and the cover 3 shown in FIGS. It is rotatably supported by a metal support shaft (not shown) supported at both ends by a pair of bosses 88a and 88b. On the other hand, the final diameter large gear 86 is provided with a projecting portion 89 concentrically and integrally as shown in FIG. 8, and the final diameter large gear 86 and the projecting portion 89 are inserted into the insertion passage as shown in FIG. The boss portion 101 forming the hole 28 and the boss portion 35 provided on the cover 3 and fitted to the protruding portion 89 are rotatably held.
[0028]
Next, as shown in FIG. 1 to FIG. 3 or FIG. 8, a rack holder 200 is provided integrally with the case body 2 on the outside thereof. The rack holder 200 is formed by a cylindrical portion that allows linear reciprocation of the rack 75 in the arrow Y direction, and an opening 211 with the pinion 71 facing the side wall portion 210 sandwiching the axis of the rack holder 200 is formed. It is equipped. The other side wall 220 is provided with an opening 221 formed by removing the entire length of the rack holder 200. As shown in FIG. 1 or FIG. 3, a meshing position “a” between the rack 75 and the pinion 71 held by the rack holder 200 in a reciprocating manner is provided in the opening 211.
[0029]
9 is a plan view of the rack 75, FIG. 10 is a cross-sectional view taken along the line XX of FIG. 9, FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. FIG.
[0030]
As shown in FIG. 12, the stopper position detection means 300 is a combination of a magnet 310 and a magnet position detection sensor 320 that is a hall element that is a counterpart of the magnet 310, and the magnet position detection sensor 320 is close to the magnet 310. It demonstrates the function to detect when they are separated. 9 to 11, the magnet 310 is inserted into the recess 76 on one side of the rack 75 and fixed by the adhesive 77, whereas the magnet position detection sensor 320 is provided on the case body 2. It is mounted on a wiring board 321 that is screwed inside. Therefore, when the rack 75 is held by the rack holder 200 and reciprocates, the magnet 310 is displaced between a position approaching the magnet position detection sensor 320 and a position separating it.
[0031]
FIG. 13 is a partially cutaway side view showing the signal cable lead-out portion into the hollow case 1.
[0032]
At this lead-out location, a plurality of signal cables 65 of the electric motor 6 are inserted into the cylindrical portion 15 provided on the outer wall of the case body 2 (that is, the outer wall of the hollow case). Further, an end portion of a tube 66 made of a watertight material such as rubber covering the signal cable 65 is externally fitted to the cylindrical portion 15 in a press-fit state. And the fitting location with respect to the cylindrical part 15 of the tube 66 is clamp | tightened by the heat-shrinkable tube 67 which shrunk through the adhesive bond layer. Accordingly, the fitting portion of the tube 66 with respect to the tubular portion 15 is sealed watertight by the close contact between the tubular portion 15 and the tube 66.
[0033]
FIG. 16 is a partial cross-sectional view illustrating a state in which the drain plug opening and closing device having the above configuration is attached to a housing 400 that houses a release wire (not shown), and FIG. 17 is a schematic perspective view of the drain plug 500.
[0034]
The drain plug 500 shown in FIG. 17 is moved up and down by the push-pull movement of the linear body 510 made of a release wire, and the drain plug 500 is switched between an open state and a closed state. A housing 400 shown in FIG. 16 is a member that accommodates the linear body 510 so as to be capable of pushing and pulling, and the internal space of the housing 400 is communicated with the drainage channel of the drain plug 500. Therefore, a situation may occur in which water flows backward from the drain plug 500 into the housing 400.
[0035]
As shown in FIG. 16, a part of the hollow case 1 of the drain plug opening / closing device is inserted into the inside through the opening 410 of the housing 400. Then, the flange 5 of the hollow case 1 is overlapped with the flange 420 on the housing 400 side, and a plurality of overlapping portions are connected via attachment screws (not shown).
[0036]
According to this mounting structure, even if water flows backward from the drain plug 500 into the housing 400, the hollow case 1 has a first matching portion 12 (see FIG. 2 or 3) between the case body 2 and the cover 3. Since the gap between the rotation shaft 72 of the pinion 71 and the hole wall surface of the insertion hole 28 is watertightly closed by the second sealant 45 and the inside of the hollow case 1 is watertight. Does not occur and the performance of the electric motor 6 and the magnet position detection sensor 320 of the plug position detection means 300 is deteriorated by the intrusion water. In addition, the situation in which water that has flowed back into the housing 400 travels from the inside of the housing 400 to the outside through the mating location 12 of the hollow case 1 crosses the mating location 12 that is the water movement path. The sealing piece 42 is blocked. Therefore, the situation where the water that has traveled from the inside of the housing 400 to the outside through the matching portion 12 of the hollow case 1 falls from the hollow case 1 outside the housing 400 does not occur.
[0037]
When the electric motor 6 rotates forward and backward, the rotation is transmitted to the pinion 71 via the speed reduction mechanism 81, and the rotation of the pinion 71 is converted into a reciprocating motion of the rack 75. Therefore, if the linear body 510 is connected to the rack 75, the linear body 510 is pushed and pulled by the reciprocating motion of the rack 510, and the drain plug 500 is opened and closed. The electric motor 6 can be remotely controlled using an operation panel (not shown). Further, when the rack 510 reciprocates, the magnet 310 provided in the rack 519 moves between the approach position and the separation position with respect to the magnet position detection sensor 320, so that the magnet position detection sensor 320 performs drainage. The position of the plug 500 (i.e., open position or closed position) is detected.
[0038]
In this embodiment, as shown in an enlarged view in FIG. 16, the adhesive 43 is applied across the outer surface of the seal piece 42 and the side surface of the thick portion 52, and the seal piece 42 is thickened by the adhesive 43. It is fixed to the meat part 52. If this is done, a situation in which the seal piece 42 protrudes from the recess 24 to cause a seal failure does not occur.
[0039]
In this embodiment, as can be seen from FIG. 3, the end of the linear body 510 (see FIG. 17) is inserted from the side into the rack holder through the opening 221 of the rack holder 200, and the end is inserted into the rack 75. It can be made to engage with a locking portion 78 provided at a location facing the opening 221. Therefore, the operation of connecting the linear body 510 to the rack 75 can be easily performed.
[0040]
As described above, the drain plug opening and closing device of this embodiment is a hollow case in which components necessary for remote control such as the electric motor 6, the speed reduction mechanism 81, and the wiring board 321 mounted with the magnet position detection sensor 320 are sealed in a watertight manner. 1, by simply attaching the hollow case 1 to the housing 400, for example, an existing manually operated drainage device can be changed to a remote control system. In addition, when the hollow case 1 is attached to the casing 400, the water that has flowed back into the casing 400 enters the hollow case 1 or travels along the matching portion 12 of the hollow case 1 to the casing 400. There is no situation of falling from inside to outside.
[0041]
【The invention's effect】
The drain plug opening and closing device according to the present invention can be easily changed from a drain device whose drain plug is opened and closed by a push-pull movement of a release wire to a remote control type drain device, for example, with a simple operation. Even if the housing containing the linear body is communicated with the water passage of the drain plug, the water that has flowed back into the casing is inside the drain plug opening / closing device. It does not happen that the operation performance is degraded due to intrusion. In addition, a drain plug opening / closing device that does not cause a situation in which water that has flowed back into the housing moves along the outer surface of the drain plug device and drops even though the assembly is simple and compact. It becomes possible to provide.
[Brief description of the drawings]
FIG. 1 is a front view of a drain plug opening and closing device according to an embodiment of the present invention.
FIG. 2 is a view taken in the direction of arrow II in FIG.
FIG. 3 is a view taken in the direction of arrow III in FIG.
FIG. 4 is a rear view of the case body with the electric motor assembled thereto.
FIG. 5 is a rear view of a case body in which an electric motor, a speed reduction mechanism, and the like are assembled.
FIG. 6 is a rear view of the cover.
FIG. 7 is a cross-sectional view showing an electric motor mounting structure.
8 is a cross-sectional view of a portion along the line VIII-VIII in FIG.
FIG. 9 is a plan view of a rack.
10 is a cross-sectional view taken along line XX of FIG.
11 is a cross-sectional view taken along line XI-XI in FIG.
FIG. 12 is an explanatory view showing an arrangement state of plug position detecting means.
FIG. 13 is a partially broken side view showing a part where the signal cable is drawn out into the hollow case.
FIG. 14 is an enlarged perspective view of a main part of the case main body.
FIG. 15 is an enlarged perspective view of a main part of the first sealing material.
FIG. 16 is a partial cross-sectional view illustrating a state in which the drain plug opening / closing device is attached to the housing.
FIG. 17 is a schematic perspective view of a drain plug.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hollow case 2 Case main body 3 Cover 5 Flange 7 Pinion rack mechanism 8 Worm 12 Matching location 15 Cylindrical part 27, 34 Pressing part 28 Insertion hole 41 1st sealing material 42 Sealing piece 45 2nd sealing material 50 Overlapping location 51 1st 1 part 56 2nd part 61 Electric motor body 62 Rotating shaft 65 of the electric motor Signal cable 66 Tube 67 Heat shrinkable tube 71 Pinion 72 Rotating shaft 75 Rack 78 Locking part 81 Deceleration mechanism 200 Rack holder 211 Opening 221 Opening 300 Plug position Detecting means 310 Magnet 320 Magnet position detecting sensor 400 Housing 500 Drain plug 510 Linear body a Pinion of the pinion and the rack

Claims (6)

A rack of a pinion rack mechanism is connected to a linear body that switches a drain plug between an open state and a closed state by a push-pull movement, and the linear body is pushed and pulled by a reciprocating movement of the rack. A drain plug opening and closing device provided with a plug position detecting means for detecting the position of the drain plug,
The rack reciprocates through forward and reverse rotation of the pinion of the pinion / rack mechanism using an electric motor as a drive source, and the stopper position detecting means detects the position of the magnet, which is the counterpart of the magnet. In combination with a sensor
The electric motor and the magnet position detection sensor are accommodated in a hollow case that is divided into a case body and a cover that is integrated with an annular region on the outer periphery of the case body, and the hollow case The annular joint portion between the case body and the cover is sealed in a watertight manner by the annular first sealing material,
The rotation shaft integral with the pinion is inserted into an insertion hole formed in the outer wall of the hollow case so that the pinion protrudes to the outside of the hollow case, and the clearance between the rotation shaft and the hole wall surface of the insertion hole. Is sealed watertight with the annular second sealing material,
The rack is meshed with the pinion in a state of being reciprocally held by a rack holder provided on the outside integrally with the hollow case, and the rack is provided with the magnet. Drain plug opening and closing device. In the hollow case, a flange for accommodating the linear body so as to be capable of pushing and pulling and for attaching a housing for accommodating a part of the hollow case is provided in a form crossing the fitting portion, and the flange is It is divided into a first part on the case body side and a second part on the cover side, and extends from the first sealing material to the outside of the overlapping part between the first part and the second part. A seal piece made of a protruding piece is interposed to seal the overlapping portion in a watertight manner, and the seal piece crosses a water movement path that moves from the inside of the housing to the outside through the mating point. The drain plug opening and closing device according to Item 1. The rotation shaft of the pinion is connected to a worm fixed to the rotation shaft of the electric motor via a speed reduction mechanism including a gear train, and the rotation shaft of the electric motor, the worm, and the gear train are connected to each other. The drain plug opening and closing device according to claim 1 or 2, which is accommodated in the hollow case. A cylindrical portion through which the signal cable of the electric motor is inserted and led out is provided on the outer wall of the hollow case, and an end portion of a tube made of a watertight material covering the signal cable is externally fitted to the cylindrical portion. The fitting portion of the tube with respect to the cylindrical portion is fastened by a heat shrinkable tube contracted via an adhesive layer, and the fitting portion is sealed in a watertight manner. The drain plug opening and closing device described in any one of the items. The said case main body and the said cover are equipped with the rib-shaped press part which clamps the cylindrical body of the said electric motor, and fixes the electric motor, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Drain plug opening and closing device. The rack holder is formed by a cylindrical portion that slidably holds the rack and allows the reciprocating motion thereof, and the pinion and the rack are arranged on one side wall portion sandwiching the axis of the rack holder. The above linear shape is provided with an opening in which a meshing portion is provided, and the other side wall has an opening formed by removing the entire length of the rack holder, and is inserted into the rack holder through the opening. The drain plug opening and closing device according to any one of claims 1 to 5, wherein a locking portion with a body is provided at a location facing the opening of the rack.

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