JPH09266867A - Device for opening and closing excrement dropping hole in toilet chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a toilet bowl chair convenient to use by preventing the presence of closing lids for an excrement dropping hole in a chair part from hindering the use of the chair as a toilet bowl. SOLUTION: An excrement dropping hole is provided in a chair part 2 provided over a leg part 1, and a storage chamber communicated with the excrement dropping hole is provided inside the leg part 1. Inside the chair part 2, right and left closing lids 27, 28 are movably supported on the leg part 1 so that they can take positions for closing and opening the storage chamber inside the excrement dropping hole. The outer edges of the right and left closing lids 27, 28 which are opposite to the opposite inner edges of the lids 27, 28 are stored inside the right and left sides 2b, 2c of the chair part 2 when the right and left closing lids 27, 28 move to the position for closing the excrement dropping hole. The right and left closing lids 27, 28 are supported at their opposite inner edges in such a way as to be movable in a direction for moving toward and away from each other, so that they project from the right and left sides 2b, 2c of the chair part 2 when moving toward the position for opening the excrement dropping hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair that can be used as a toilet bowl for caring for a sick person.

[0002]

2. Description of the Related Art In a conventional toilet chair, as a closing lid for a stool drop hole in a stool, one that is separated from the stool or one that is tiltably supported on the stool is available. is there.

[0003]

In any toilet bowl chair, when it is used as a toilet bowl, the obstruction lid must be placed next to it apart from the stool, or the obstruction lid must be lifted and leaned against the stool. In addition, the presence of the closing lid itself hinders use and is inconvenient.

It is an object of the present invention to provide a toilet chair which is convenient to use by improving the structure of assembling the closing lid with respect to the stool.

[0005]

The present invention will be described with reference to the reference numerals in the drawings (FIGS. 1 to 11) of the embodiments described later. The toilet chair according to the first aspect of the invention is configured as follows.

In the toilet chair, the seat (2) provided on the leg (1) is provided with drop holes (17, 18), and the drop holes (17, 18) are provided in the leg (1). A storage chamber (10) communicating with is provided. In the filth drop hole opening / closing device, the cover (26) is movably supported on the leg (1) inside the stool (2), and the storage chamber (10) is held by the drop holes (17, 18). The closed position and the open position can be taken.

The second invention has the following configuration added to the first invention. The stool (2) is the front side (2a) on both feet of the user sitting on it, the left and right sides (2b, 2c) on the left and right hands of the user, and the back of the user. It has a rear side (2d). The cover (26) is provided with closing lids (27, 28) provided inside the left and right sides (2b, 2c) of the stool (2), respectively, and is provided with a drop hole (1).
(7, 18) When moving to the closing position, drop holes (17, 1)
8) has opposing inner edge portions (27a, 28b) of both closing lids (27, 28) that abut each other.

The third invention adds the following constitution to the second invention. The outer edges of the both closure lids (27, 28), which are opposite sides to the opposite inner edges (27a, 28b) of the both closure lids (2), are moved to the position where the drop holes (17, 18) are closed. It is housed inside the left and right both sides (2b, 2c). The both closing lids (27, 28) are arranged so as to project from the left and right side portions (2b, 2c) of the stool portion (2) when the dropping holes (17, 18) are moved to the opening position. 27a, 28b) are supported so as to be movable in the directions toward and away from each other.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A toilet chair according to a first embodiment of the present invention will be described below with reference to FIGS. [Outline of Toilet Chair] As shown in FIGS. 1 (a), 1 (b) and 1 (c), the toilet chair has a leg portion 1, a stool portion 2 provided on the leg portion 1, and a stool portion 2 protruding above the stool portion 2. It has a backrest portion 3 and an armrest portion 4.

(The above-mentioned leg portion 1 shown in FIGS. 1 to 3, 7 and 8) The leg portion 1 comprises a housing box 5 and a front left leg rod 6, a front right leg rod 7 and a rear left leg respectively provided at four corners thereof. It comprises a leg rod 8 and a rear right leg rod 9. An accommodation chamber 10 is provided in the accommodation box 5. A door 11 is provided on the rear side of the storage box 5, and the door 1
1, the accommodation chamber 10 is opened and closed. Inside the door 11 is a pocket 1 for storing various items such as toilet paper.
2 are provided.

(The stool portion 2 shown in FIGS. 1 to 3) The stool portion 2 includes a main body 13 mounted on the storage box 4,
The butt rest plate 1 detachably mounted on the main body 13
4 The stool body 13 is an outer frame body 15.
And an inner plate 16 attached to the inner periphery thereof. A drop hole 17 is formed at the center of the inner plate 16. A drop hole 18 is formed above the drop hole 17 of the inner plate 16 and communicates with the bottom plate 14 at the center thereof. The storage chamber 10 of the leg portion 1 communicates with these drop holes 17 and 18.

The stool section 2 is a front side section 2a on both sides of the user who sits on it, left and right side sections 2b and 2c on the left and right sides of the user, and a rear side section on the back side of the user. 2d and. The front side part 2a and the left and right side parts 2b, 2c of the stool section 2 project forward and leftward from the front upper end part and the left and right upper end parts of the storage box 5, and below the front side part 2a and the left and right side parts 2b, 2c. Thus, a space is formed on the outer circumference of the storage box 5. The rear side 2d of the stool 2 is almost directly above the rear upper end of the storage box 5. The front left leg rod 6, the front right leg rod 7, the rear left leg rod 8 and the rear right leg rod 9 of the leg portion 1 are attached to the outer frame body 15 of the stool body 13, respectively.

(The backrest portion 3 and the armrest portion 4 shown in FIG. 1) The backrest portion 3 and the armrest portion 4 are formed by the front left leg rod 6, the front right leg rod 7, the rear left leg rod 8 and the rear of the leg portion 1. Front left vertical rod 19 and front right vertical rod 2 each extending upward from the right leg rod 9 in series.
0, rear left vertical rod 21 and rear right vertical rod 22, and front left vertical rod 1
9 and the rear left vertical rod 21, the front right vertical rod 20 and the rear right vertical rod 22
From the left side rod 23 for the armrest, the right side rod 24 for the armrest, and the rear side rod 25 for the backrest, which are erected between the upper ends of the rear left vertical rod 21 and the rear left vertical rod 22 and between the upper ends thereof. Become. The vertical rods 19, 20, 21, 22 and the horizontal rods 23, 24,
The armrest part 4 and the backrest part 3 are each open between 25 and 25.

[Regarding the filth drop hole opening / closing device incorporated inside the stool part 2] (Cover 26 supported on the stool part body 13 inside the butt rest plate 14) This cover 26 is closed on both the left and right sides. Board 2
7 and 28, both left and right sides 2b, 2c of the stool 2
Are provided between the drop holes 17 of the inner plate 16 of the stool body 13 and the drop holes 18 of the buttocks plate 14 on the inside. The plain bearings 2 are mounted on the inner plate 16 on both front and rear sides of the drop hole 17.
9a is mounted, and both front and rear sides of the left and right closing plates 27, 28 are supported on the front and rear plain bearings 29a. The left and right closing plates 27, 28 slide on the front and rear plain bearings 29a and move in the left and right directions along the front and rear rails 29b.
The left and right blocking plates 27, 28 have opposite inner edge portions 27a,
A notch 30 is formed on each of the outer edges that are opposite to 28a, and a tension coil spring 31 (elastic body) is connected between the inner edge of the notch 30 and the inner plate 16. Due to the elastic force of the tension coil spring 31, as shown in FIG. 3, the opposite inner edge portions 27a and 28a of the left and right closing plates 27 and 28 are separated from each other, and the left and right closing plates 27 and 2 are closed.
A part of 8 comes into contact with the inner peripheral edge of the drop hole 17 of the inner plate 16 or the outer frame body 15 and stops. Then, the left and right blocking plates 27,
The outer edge side of 28 is the left and right side portions 2b, 2c of the stool portion 2.
Then, the storage chamber 10 is opened by the both drop holes 17 and 18.

A mounting shaft 32 (mounting portion) is supported at the inner edge of the notch 30 in the left and right closing plates 27, 28 so as to be vertically rotatable at one end thereof. Then, in the state of FIG. 1 (c) and FIG. 3 in which the outer edge portions of the left and right blocking plates 27, 28 protrude from the left and right side portions 2b, 2c of the stool section 2,
The toilet paper 33 can be inserted into the mounting shaft 32 from the other end side, and the other end can be locked to the inner edge of the notch 30 to accommodate the toilet paper 33 in the notch 30. .

(The left and right blocking plates 27 shown in FIGS.
28 interlocking mechanism) The inner plate 16 is provided on both front and rear sides of the drop hole 17.
Left and right pulleys 34, 35 are attached to the upper side, and a wire 36 is stretched between the left and right pulleys 34, 35. The wire 36 has an inner wire portion 36a and an outer wire portion 36b connected in series so as to move in opposite directions. Both front and rear portions of the right blocking plate 28 are connected to inner wire portions 36a of the front and rear wires 36 via tension springs 36c, and both front and rear portions of the left blocking plate 27 are connected to outer wire portions 36b of the front and rear wires 36. On the other hand, they are connected via a tension spring 36c.

Both the left and right closing plates 27, 28 project from the left and right both sides 2b, 2c of the stool 2 and both the drop holes 1
After the toilet paper 33 in the cutout 30 is pulled out from the mounting shaft 32 in the state of FIG. 1 (c) and FIG. 3 in which the storage chamber 10 is opened at 7 and 18, one of the left and right closing plates 27 and 28 is closed. When an object is pushed, the left and right closing plates 27, 28 are interlocked by the front and rear wires 36 against the elastic force of the tension coil spring 31. Therefore, as shown in FIG. 1 (b) and FIG.
The left and right blocking plates 27, 28 are opposed to each other on the inner edge portions 27a,
At 28a, they come into close contact with each other and simultaneously close the storage chamber 10 by both of the drop holes 17 and 18, and they are stored inside the left and right side portions 2b and 2c of the stool 2.

(The left and right blocking plates 27 shown in FIGS.
(Holding mechanism 28) Left and right magnets 37, 38 are attached to the front and rear sides of the opposite inner edge portions 27a, 28a of the left and right closing plates 27, 28, respectively. And FIG.
As shown in (b) and FIG.
a and 28a are in contact with each other, the magnets 37,
When 38 is attracted to each other, the left and right blocking plates 27 and 28 hold the positions where both the drop holes 17 and 18 are closed.

(The left and right blocking plates 27 shown in FIGS. 2 to 6,
28 holding release mechanism) The seat 2 has a rear side 2d.
A support shaft 39 is rotatably supported in the outer frame 15 at the center position in the left-right direction. At the inner end portion of the support shaft 39, the engaging member 4 is provided on the inner plate 16 of the stool body 13.
0 is attached so as to be integrally rotatable, and both the left and right closing plates 27, 28
Are sandwiched between the front and rear end portions of the facing inner edge portions 27a, 28a.

A release lever 41 is attached to the outer end portion of the support shaft 39 outside the outer frame body 15 so as to be integrally rotatable, and stopper pins 42a are provided outside the outer frame body 15 on both sides of the release lever 41. , 42b are projected. A tension coil spring 43 is connected between this and the support shaft 39 in the outer frame body 15, and the release lever 41 rotates together with the support shaft 39 by the elastic force thereof and abuts on one stopper pin 42a.
In this non-disengaged state shown in FIGS. 4 and 5, the engagement body 40 is separated from the front and rear ends of the opposed inner edge portions 27a and 28a of the left and right closing plates 27 and 28, and the magnet 37 of the opposed inner edge portions 27a and 28a is removed. , 38 are adsorbed to each other.

As shown in FIG. 6, when the release lever 41 is rotated against the elastic force of the tension coil spring 43 and brought into contact with the other stopper pin 42b, the engaging body 40 rotates together with the support shaft 39. It moves to abut the front and rear ends of the opposite inner edge portions 27a, 28a of the left and right blocking plates 27, 28, and separates them against the attraction force of the magnets 37, 38. Therefore, the left and right blocking plates 27 and 28 are opened by the elastic force of the tension coil spring 31 while the front and rear wires 36 interlock with each other to simultaneously open the storage chamber 10 in both the drop holes 17 and 18.

[How to Use the Toilet Chair] (Use as a general furniture-like chair) As shown in FIG.
While the drop holes 17 and 18 are closed by 28, a sitting table 44 is placed on the seat 2 so that the drop holes 17 and 18 cannot be seen from the outside. Then, this toilet chair is placed near a bed or the like.

(Use as a toilet bowl)
As shown in (b), the seat cushion 44 is removed from the stool section 2 and the release lever 41 is operated to separate the left and right blocking plates 27, 28 from each other as shown in FIG. open. In addition, the caregiver uses the left and right occlusion plates 27, which protrude from the left and right side portions 2b and 2c of the stool 2.
The toilet paper 33 is inserted into the mounting shaft 32 of 28. Further, as shown in FIG. 8, the caregiver opens the rear door 11 and puts the recovery bucket 45 into the accommodation chamber 10 below the drop holes 17 and 18. Next, the caregiver takes care of the user, such as a sick person, and wakes it up from the bed or the like, and makes him sit on the stool 2. After use, the caregiver takes care of the user, such as a sick person, stands up on the stool 2 and lays it on a bed or the like. Then, the caregiver returns the toilet chair to the above-mentioned use state as a furniture-like chair, opens the rear door 11 again, takes out the collection bucket 45, and disposes of the waste.

The present embodiment has the following characteristics (a) to (e) (other than other technical ideas described later). (A) Cover 26 for opening and closing the collection bucket storage chamber 10
The left and right closing lids 27, 28 are provided inside the stool section 2. Therefore, when used as a toilet bowl as shown in FIGS. 3 and 1 (c), the presence of the closure lids 27 and 28 itself does not hinder the use and is very convenient to use.

(B) The cover 26 is attached to the left and right closing lids 27,
Since it is divided into 28 parts, they can share and close the drop holes 17 and 18 as shown in FIGS. 2 and 1B. Therefore, when used as a toilet as shown in FIGS. 3 and 1 (c), the left and right closing lids 27, 28
It is possible to reduce the size of the protrusion from the right and left sides 2b and 2c of the stool 2. Therefore, in combination with the above (a), the presence of the closing lids 27, 28 themselves does not hinder the use, and is very convenient for use.

(C) As shown in FIGS. 2 and 1 (b), the outer edges of the left and right closing lids 27, 28 are provided with the drop hole 1
When the seats 7 and 18 are moved to the closed position, they are stored inside the left and right sides 2b and 2c of the stool 2. Therefore, in combination with the above (a) and (b), the presence of the closing lids 27 and 28 themselves does not hinder the use and is very convenient for use.

(D) As shown in FIGS. 3 and 1C, the outer edges of the left and right closing lids 27 and 28 are provided with the drop hole 1
It projects from the left and right side portions 2b, 2c of the stool portion 2 when moving to the open position. Therefore, the closing lid 27,
The protruding portions of 28 can be used for various purposes and are very convenient to use.

(E) As shown in FIG. 7, a space 5a is formed in front of the storage box 5 and below the front side portion 2a of the seat 2. Therefore, a user such as a sick person can put his / her foot into the space 5a to stand up and easily perform the operation.

Other Embodiments In addition to the first embodiment, the following (a) to (e) may be configured. (A) In the second embodiment shown in FIGS. 9 and 10, when used as a toilet bowl, in order to hide the front plain bearing 29a in the front side portion 2a of the stool section 2 in the first embodiment, the following configuration is used. Has been adopted.

An upper concealment plate 46 is attached to the outer frame body 15 of the stool body 13 above the left and right closing lids 27 and 28, and is pressed down on the lower side of the hip rest part 14, and the upper concealment plate 46 is The tip 46a side is the drop hole 1 of the inner plate 16 of the stool body 13
It projects to the 7 side. The upper concealing plate 46 covers the upper side of the front plain bearing 29a. In addition, both left and right closing covers 27, 28
A side concealing plate 47 is attached to the inner plate 16 below the front end of the side concealing plate 47 and protrudes into the drop hole 17.

Then, as shown in FIGS. 9 (a) and 10 (a), in a state in which the left and right closing lids 27 and 28 are open to each other, the side concealing plate 47 with respect to the tip end portion 46a of the upper concealing plate 46. The tip end portion 47a of the contact portion is in contact due to its elasticity.
Therefore, the side concealing plate 47 is interposed between the front plain bearing 29a and the drop hole 17 to cover the side of the front plain bearing 29a.

As shown in FIGS. 9 (b) and 10 (b), when the left and right closing lids 27, 28 are closed to each other, the side concealing plate is formed by the facing inner edges 27a, 28b of the left and right closing lids 27, 28. The left and right side edges of 47 are pushed, the side concealing plate 47 bends downward due to its elasticity, and the left and right closing lids 27, 28 are pushed into the lower side. Therefore, both the left and right closing lids 27 and 28 are allowed to close.

On the other hand, as shown in FIGS. 9 (a) and 10 (a), when the left and right closing lids 27, 28 are opened to each other, the side concealing plate 47 returns upward due to its elasticity and becomes the upper concealing plate 46. Abut.

(B) In the first embodiment, as shown in FIGS. 2 and 3, the release lever 4 is provided only on the rear side portion 2d of the sitting portion 2.
1 is attached, and the caregiver operates this release lever 41. In the third embodiment shown in FIG. 11, a similar release lever 41 is attached to the front side portion 2a of the stool portion 2,
A user such as a sick person can also operate the release lever 41. Therefore, it is convenient to use.

(C) The cover 26 is attached to the left and right closing lids 27,
It is composed of one lid without being divided into 28 pieces. (D) The cover 26 is composed of a single bellows-like lid.
Then, the bellows-like lid is expanded / contracted to open / close the drop holes 17, 18.

(E) As the holding mechanism and the holding release mechanism, instead of the magnets 37 and 38, detachable engaging concave and convex portions are used, and an operating portion for attaching and detaching the engaging concave and convex portions is provided.

[Other technical ideas] The technical ideas (other than the claims) that can be grasped from each embodiment will be described together with the effects.
In order to make it convenient to use, it is configured as shown in (a) to (n) below.

(A) In the second or third aspect, the both closing lids 27 and 28 are urged by an elastic body (tensile coil spring 31) so as to move to the positions where the drop holes 17 and 18 are opened. . Therefore, it is easy to open both the closure lids 27 and 28.

(B) In the above (a), both closing lids 2
7, 28 is provided with a mechanism for holding the position where the drop holes 17, 18 are closed. Therefore, the both closing lids 27 and 28 are not opened carelessly.

(C) In Claim 2 or Claim 3, or in (a) or (b) above, both of the closure lids 27, 2
8 is provided with a mechanism for interlocking with each other so that the dropping holes 17 and 18 can be closed or opened at the same time. Therefore, it is easy to open and close both closing lids 27 and 28.

(D) In (c) above, the interlocking mechanism has a first interlocking link portion (inner wire portion 36a) and a second interlocking link portion (outer wire portion 36b) connected in series so as to move in opposite directions. The endless winding transmission link (wire 36) having the above is provided, and one of the closing lids 27 and 28 is connected to the first interlocking link portion and the other closing lid 27 is connected to the second interlocking link. Connected to the department. Therefore, the interlocking mechanism can have a simple structure.

(E) In the above (b), the holding mechanism is configured such that the opposing inner edges 27a, 28 of the both closing lids 27, 28 are opposed to each other.
It is provided with magnets 37 and 38 for attracting a to each other. Therefore, the holding mechanism can have a simple structure.

(F) In the above (a), both closing lids 2
7, 28 is provided with a mechanism for holding the position where the drop holes 17 and 18 are closed, and a mechanism for interlocking them so that both closing lids 27 and 28 can take the position to close or open the drop holes 17 and 18 at the same time. The holding mechanism is provided with magnets 37 and 38 for attracting mutually facing inner edge portions 27a and 28a of the both closing lids 27 and 28 to each other.

(G) In the above (e) or (f), the opposite inner edges 27a, 2 of the both closure lids 27, 28 are opposed to each other.
A holding / releasing mechanism for separating the magnet 8a from the magnets 37, 38 is provided. Therefore, it is easy to open both the closure lids 27 and 28.

(H) In the above (g), the holding release mechanism is such that the opposed inner edge portions 27a, 2 of the both closing lids 27, 28 are opposed to each other.
Equipped with engaging bodies 41, 42 sandwiched between 8a, the engaging bodies 41, 42 are in contact with the opposite inner edge portions 27a, 28a of the both closing lids 27, 28 to separate them.
It can be set at a position away from the opposite inner edge portions 27a, 28a of the both closing lids 27, 28 and allowing suction between them. Therefore, the holding release mechanism can have a simple structure.

(I) In claim 3 or above (a) or above (b) or above (c) or above (d) or above (e) or above (f) or above (to) or above (h) The toilet paper 3 is attached to the outer edges of the closure lids 27 and 28 that project from the left and right side portions 2b and 2c of the stool 2 when the fall holes 17 and 18 are moved to the open position.
A mounting portion (mounting shaft 32) such as 3 is provided. Therefore, the protruding portions of the closing lids 27 and 28 can be used for various purposes.

(Nu) Claim 1 or Claim 2 or Claim 3 or above (a) or above (b) or above (c) or above (d) or above (e) or above (f) or above ( G) or above (h) or above (ri), the storage chamber 10 in the leg 1 is opened and closed by the door 11 provided in the leg 1. Therefore, the filth recovery bucket 45 can be easily taken in and out of the storage chamber 10.

[0048]

According to the filth drop hole opening / closing device for a toilet chair of the present invention, when used as a toilet bowl, the cover (2) for the drop holes (17, 18) of the stool (2) is used.
6) For example, the presence of both closing lids (27, 28) itself does not hinder the use and is convenient for use.

[Brief description of drawings]

FIG. 1A is a perspective view showing a state in which the toilet bowl chair according to the first embodiment is used as a general furniture-like chair without being used as a toilet bowl, and FIG. 1B is used as the toilet bowl. In this case, it is a perspective view showing a state in which both the closing lids are closed with respect to the filth drop hole of the stool, and (c) is a perspective view showing the same opened state.

FIG. 2 is a plan sectional view showing the inside of a stool in the toilet chair in the state of FIG. 1 (b).

FIG. 3 is a plan sectional view showing the inside of a stool in the toilet chair in the state of FIG. 1 (c).

FIG. 4 is a partial plan cross-sectional view of FIG. 2, showing a mechanism for holding both closed lids in a closed state and a mechanism for releasing the holding.

5 (a) is a partial rear view of FIG. 4, and FIG. 5 (b) is a partial sectional view taken along line XX of FIG.

FIG. 6 (a) is a partial rear view showing a state in which the release lever of FIG. 5 (a) is operated to open both closing lids,
FIG. 5B is a partial cross-sectional view corresponding to FIG. 5B when the both closing lids are opened.

7 is a sectional view taken along line YY of FIG.

8 is a plan sectional view showing a state in which a rear door is opened from the state of FIG.

9A is a plan sectional view corresponding to FIG. 3 in the toilet chair according to the second embodiment, and FIG. 9B is a plan sectional view corresponding to FIG.

10A is a partial sectional view taken along line Z ₁ -Z ₁ of FIG. 9A, and FIG. 10B is a partial sectional view taken along line Z ₂ -Z ₂ of FIG. 9B.

FIG. 11 is a perspective view showing a toilet chair according to a third embodiment.

[Explanation of symbols]

1 ... Legs, 2 ... seats, 10 ... accommodation chambers, 17,18 ...
Drop hole, 26 ... Cover, 27, 28 ... Closure lid, 27a,
28b ... Inner edge facing the closed lid.

Claims (3)

[Claims] 1. A drop hole (17, 18) is provided in a stool (2) provided on the leg (1), and the drop hole (17, 18) communicates with the inside of the leg (1). A storage chamber (10) is provided, a cover (26) is movably supported on the leg (1) inside the seat (2), and the storage chamber (10) is closed by the drop holes (17, 18). A filth drop hole opening / closing device for a toilet chair, characterized in that the position and the open position can be set. 2. The stool part (2) includes a front part (2a) on both feet of the user sitting on the seat, two left and right parts (2b, 2c) on the left and right hands of the user, and a user. And a rear side portion (2d) on the back side of the cover (26), and a cover (26) is provided inside the left and right side portions (2b, 2c) of the stool (2), respectively.
28), and the opposing inner edges (27a, 28b) of the both closing lids (27, 28) that come into contact with each other at the drop holes (17, 18) when moving to the position where the drop holes (17, 18) are closed.
The filth drop hole opening / closing device in the toilet chair according to claim 1, further comprising: 3. The outer edges of the both closing lids (27, 28), which are opposite to the opposite inner edges (27a, 28b) of the both closing lids (27, 28), move to a position where the drop holes (17, 18) are closed. It is stored inside both left and right sides (2b, 2c) of the stool (2) and protrudes from both left and right sides (2b, 2c) of the stool (2) when it moves to the position where the drop holes (17, 18) are opened. As described above, the both closure lids (27, 28) are movably supported by the inner edge portions (27a, 28b) facing each other so as to move toward and away from each other. Opening / closing device for filth drop holes in chairs.