Patent Grant
11927004
The present invention relates to a flush water tank device and particularly to a flush water tank device for supplying flush water to an upper spout port above a retained water surface in a flush toilet main body and a lower spout port below the retained water surface and a flush toilet apparatus provided with the same.
Japanese Patent Laid-Open No. 6-146365 (Patent Document 1) describes a toilet washing tank device. According to the toilet washing tank device, a lever member is pressed down through rotation of a lever handle, and as a result, a selector valve is switched to a rim water passage side, and a water supply valve is opened. In this manner, ejection of flush water, which has been supplied from a water supply source such as tap water, from a rim water passage portion is started. Here, a float is attached to a distal end of the lever member, and a force pushing up the lever member acts on the lever member due to a buoyant force acting on the float. However, a state where the lever member is pushed down is held by engagement between a rotary pushing portion and the lever member included in the toilet washing tank device.
Furthermore, a reservoir tank is provided with a delayed valve opening-type water discharge means, and flush water in the reservoir tank is drained to a jet water conduit with delay after water ejection from the rim water passage portion is started. When the water level in the reservoir tank is lowered to a predetermined water level by the flush water in the reservoir tank being drained, then the buoyant force does not act on the float provided at the lever member, and the engagement between the rotary pushing portion and the lever member is thus released. When the engagement between the rotary pushing portion and the lever member is released, then the rotary pushing portion is turned, and consequently the selector valve is switched to the side of water supply to the tank. In this manner, the water ejection from the rim water passage portion is stopped, and the flush water flowing in from the water supply source through the water supply valve is supplied to the reservoir tank. When the water level in the reservoir tank is raised by the water supply to the reservoir tank, the lever member is pushed up due to the buoyant force acting on the float. When the water level in the reservoir tank is raised to a predetermined water level, the water supply valve of a ball tap type is opened by the lever member, and the toilet washing tank device is restored to an initial state.
Here, in the toilet washing tank device described in Patent Document 1, engagement between rotary pushing portion and the lever member is released by the flush water in the reservoir tank being drained and by the water level in the reservoir tank being thus lowered, and the selector valve is switched from the side of the rim water passage to the side of the water supply to the tank. Therefore, according to the toilet washing tank device described in Patent Document 1, stopping of the water ejection from the rim spout port is determined depending on the water level in the reservoir tank. However, since the water level in the reservoir tank changes depending on the flow rates of discharged water of the flush water from the reservoir tank and the flush water flowing into the reservoir tank via the water supply valve, it is difficult to finely control the water level.
Also, in the toilet washing tank device described in Patent Document 1, the engagement state between the rotary pushing portion and the lever member is maintained by the buoyant force acting on the float attached to the lever member. Therefore, there may be a case where the engagement between the rotary pushing portion and the lever member is released at an unintended timing due to ruffling or the like of the water surface in the reservoir tank. Therefore, the toilet washing tank device described in Patent Document 1 has a problem that it is difficult to accurately control a timing at which the flush water supplied from the water supply source and ejected from the rim water passage portion is to be stopped.
Therefore, an object of the present invention is to provide a flush water tank device capable of reliably stopping flush water supplied from a water supply source at an accurate timing and a flush toilet apparatus provided with the same.
In order to solve the aforementioned problem, the present invention provides a flush water tank device for supplying flush water to an upper spout port above a retained water surface in a flush toilet main body and a lower spout port below the retained water surface, the flush water tank device including: a flush water tank main body; a discharge valve that causes the flush water retained in the flush water tank main body to be drained and causes the flush water to be ejected from the lower spout port on the basis of an operation of a user; a first on-off valve for performing switching between an ejection state from the upper spout port and an ejection stopped state of the flush water supplied from a water supply source; a first on-off valve driving mechanism that is moved from a stopped position at which the first on-off valve is brought into the ejection stopped state to an ejection position at which the first on-off valve is brought into the ejection state on the basis of the operation of the user; a biasing mechanism that causes a bias force such that the first on-off valve driving mechanism is moved to the stopped position; a holding mechanism that holds the first on-off valve driving mechanism which has been moved to the ejection position at the ejection position against the bias force caused by the biasing mechanism; and a releasing mechanism that releases the holding of the first on-off valve driving mechanism achieved by the holding mechanism, using the flush water flowing out from the first on-off valve.
In the present invention configured in this manner, the discharge valve causes the flush water retained in the flush water tank main body to be ejected from the lower spout port of the flush toilet main body on the basis of an operation of the user. Also, the first on-off valve driving mechanism is moved from the stopped position at which the first on-off valve is brought into the ejection stopped state to the ejection position at which the first on-off valve is brought into the ejection state on the basis of an operation of the user, and the first on-off valve causes the flush water supplied from the water supply source to be ejected from the upper spout port. Moreover, the biasing mechanism causes a bias force such that the first on-off valve driving mechanism is moved to the stopped position, and the holding mechanism holds the first on-off valve driving mechanism at the ejection position against the bias force caused by the biasing mechanism. The releasing mechanism releases the holding of the first on-off valve driving mechanism achieved by the holding mechanism, using the flush water flowing out from the first on-off valve.
According to the present invention configured in this manner, the held state of the first on-off valve driving mechanism is released and the first on-off valve driving mechanism is moved to the stopped position using the flush water supplied from the water supply source such as tap water and flowing out from the first on-off valve, and it is thus possible to reliably cause the water ejection from the upper spout port to be stopped at an accurate timing without being affected by a water level in the flush water tank main body. Also, since the first on-off valve driving mechanism is biased by the bias force of the biasing mechanism, the bias force is stable, and it is possible to prevent the first on-off valve driving mechanism from being accidentally moved and to cause the first on-off valve driving mechanism to reliably operate.
Preferably, the releasing mechanism causes the holding of the first on-off valve driving mechanism to be released and causes the first on-off valve driving mechanism to move to the stopped position on the basis of an amount of the flush water flowing out from the first on-off valve in the present invention.
According to the present invention configured in this manner, the releasing mechanism causes the holding of the first on-off valve driving mechanism to be released on the basis of the amount of flush water flowing out from the first on-off valve, and it is thus possible to accurately set a time during which the first on-off valve is opened and to finely control the amount of flush water to be ejected from the upper spout port.
Preferably, the flush water flowing out from the first on-off valve is branched and supplied to each of the upper spout port and the releasing mechanism in the present invention.
According to the present invention configured in this manner, the flush water flowing out from the first on-off valve is branched and supplied to each of the upper spout port and the releasing mechanism, and it is thus possible to use the flush water supplied from the water supply source and flowing out from the first on-off valve both for washing the flush toilet and for operating the releasing mechanism.
Preferably, the releasing mechanism includes a water receiving portion into which the flush water supplied from the first on-off valve flows and causes the holding of the first on-off valve driving mechanism achieved by the holding mechanism to be released when the flush water retained in the water receiving portion exceeds a predetermined amount in the present invention.
According to the present invention configured in this manner, the holding of the first on-off valve driving mechanism is released depending on the amount of flush water supplied from the first on-off valve and retained in the water receiving portion, and it is thus possible to release the holding achieved by the holding mechanism on the basis of the amount of flush water with a simple mechanism.
Preferably, a second on-off valve for causing the discharge valve to open is further included, the releasing mechanism causing the holding of the first on-off valve driving mechanism to be released and causing the second on-off valve to open when the flush water retained in the water receiving portion exceeds a predetermined amount in the present invention.
According to the present invention configured in this manner, the releasing mechanism causes the holding of the first on-off valve driving mechanism to be released and causes the second on-off valve to open when the flush water retained in the water receiving portion exceeds the predetermined amount, and it is thus possible to control the discharge valve as well using the flush water flowing out from the first on-off valve.
Preferably, a water pressure driving mechanism that causes the discharge valve to open and close is further included, the water pressure driving mechanism causing the discharge valve to open by a water pressure of the flush water supplied via the second on-off valve in the present invention.
According to the present invention configured in this manner, the water pressure driving mechanism that causes the discharge valve to open and close is included, and it is thus possible to cause the discharge valve to open even with a relatively small amount of flush water flowing out from the second on-off valve.
Preferably, the biasing mechanism includes a small tank that is provided inside the flush water tank main body and retains the flush water and a biasing float that is disposed inside the small tank, and the biasing mechanism uses a buoyant force acting on the biasing float in the present invention to generate the bias force.
According to the present invention configured in this manner, the bias force caused by the biasing mechanism is caused using the buoyant force acting on the biasing float, and it is thus possible to reliably cause the bias force with a simple mechanism. Also, since the biasing float is disposed in the small tank, it is possible to cause a stable bias force regardless of a water level in the flush water tank main body.
Preferably, the holding mechanism includes an engaging member and an engaged member that is engaged with the engaging member, and the first on-off valve driving mechanism is held at the ejection position by the engaging member engaging with the engaged member in the present invention.
According to the present invention configured in this manner, the holding mechanism holds the first on-off valve driving mechanism at the ejection position by the engaging member engaging with the engaged member, and it is thus possible to reliably hold the first on-off valve driving mechanism at the ejection position with a simple mechanism.
Preferably, the engaging member is provided such that the engaging member is movable between an engagement position and an engagement released position, and the engaging member is biased by an elastic member toward the engagement position in the present invention.
According to the present invention configured in this manner, the engaging member is biased by the elastic member toward the engagement position, and it is thus possible to reliably cause the engaging member to move to the engagement position and to cause the holding mechanism to reliably operate with a simple mechanism.
Preferably, the engaging member includes a sloped surface, and when the first on-off valve driving mechanism is moved to the ejection position based on the operation of the user, the engaging member is moved toward the engagement released position against a bias force of the elastic member by the sloped surface sliding along the engaged member in the present invention.
According to the present invention configured in this manner, the engaging member is moved toward the engagement released position by the sloped surface of the engaging member sliding along the engaged member, and it is thus possible to reliably cause the engaging member to move with a simple mechanism on the basis of an operation of the user.
Also, the present invention provides a flush toilet apparatus including: a flush toilet main body that includes an upper spout port above a retained water surface and a lower spout port below the retained water surface; and the flush water tank device according to the present invention that supplies the flush water to the upper spout port and the lower spout port
According to the flush water tank device of the present invention, it is possible to accurately set an ejection timing of flush water without using a motor for pulling up the discharge valve.
Next, a flush toilet apparatus according to embodiments of the present invention will be described with reference to the accompanying drawings.
As illustrated in
Additionally, as a modification example, the present invention can also be configured such that the bowl 2a is washed in response to an operation performed on a remote controller device (not illustrated) attached to a wall surface. Alternatively the present invention can also be configured such that the bowl 2a is washed in response to elapse of a predetermined time after a human sensor (not illustrated) provided at a toilet seat detects separation of a user from the seat. In this case, the human sensor (not illustrated) can be provided at the toilet seat, can be provided at a position where it can detect a user's motion of being seated, being separated from the seat, approaching the seat, leaving, or placing his/her hand near it, and for example, it is possible to provide the human sensor in the flush toilet main body 2 or the flush water tank device 4. Also, any human sensor (not illustrated) can be used as long as it can detect the user's motion of being seated, being separated from the seat, approaching the seat, leaving, or placing his/her hand, and for example, it is possible to use an infrared sensor or a microwave sensor as the human sensor. As described above, “on the basis of the user's operation” in the present specification means a user's arbitrary motion that serves as a trigger to start washing the toilet.
Next, the flush water tank device 4 includes a reservoir tank 10 that is a flush water tank main body for retaining flush water to be supplied to the flush toilet main body 2, a discharge valve 12 for opening and closing a drain port 10a provided in the reservoir tank 10, and a discharge valve water pressure drive portion 14 that is a water pressure driving mechanism for driving the discharge valve 12 as illustrated in
Next, the flush water tank device 4 further includes a water supply valve driving mechanism 16 that is a first on-off valve driving mechanism that is moved from a stopped position at which the water supply control valve 19 is brought into an ejection stopped state to an ejection position at which the water supply control valve 19 is brought into an ejection state on the basis of an operation of the user and a biasing mechanism 17 that causes a bias force such that the water supply valve driving mechanism 16 is moved to the stopped position as illustrated in
The reservoir tank 10 is a tank configured to retain the flush water to be supplied to the jet spout port 2b of the flush toilet main body 2, and the drain port 10a (
As illustrated in
Next, a structure of the discharge valve water pressure drive portion 14 will be described with reference to
The discharge valve water pressure drive portion 14 is configured to drive the discharge valve 12 using a water supply pressure of the flush water supplied from the tap water C. As illustrated in
The cylinder 14a is a cylindrical member, is disposed with an axial line thereof directed in a vertical direction, and slidably receives the piston 14b therein. Also, the inlet pipe 23 is connected to a lower end portion of the cylinder 14a such that water flowing out from the discharge valve control valve 18 flows into the cylinder 14a from the lower end portion. Therefore, the piston 14b in the cylinder 14a is pushed upward against a biasing force of the spring 14c due to the water that has flowed into the cylinder 14a.
On the other hand, an outlet hole is provided at an upper end portion of the cylinder 14a, and the outlet pipe 24 communicates with the inside of the cylinder 14a through the outlet hole. Therefore, once water flows into the cylinder 14a from the inlet pipe 23 connected to the lower portion of the cylinder 14a, the piston 14b is pushed upward from the lower portion of the cylinder 14a. Then, when the piston 14b is pushed upward above the outlet hole, the water flowing into the cylinder 14a flows out from the outlet hole through the outlet pipe 24. In other words, the inlet pipe 23 and the outlet pipe 24 communicate with each other via the inside of the cylinder 14a when the piston 14b is moved upward.
Also, as illustrated in
Next, as illustrated in
Also, a clearance 14d is provided between the rod 15 projecting from the lower side of the cylinder 14a and an inner wall of the through-hole 14f of the cylinder 14a, and a part of water flowing into the cylinder 14a flows out from the clearance 14d. The water flowing out from the clearance 14d flows into the reservoir tank 10. Note that since the clearance 14d is relatively narrow, and a flow channel resistance is large, the pressure in the cylinder 14a increases due to the water flowing into the cylinder 14a from the inlet pipe 23 even in a state in which the water flows out from the clearance 14d, and the piston 14b is pushed upward against the biasing force of the spring 14c.
Furthermore, the clutch mechanism 22 is provided at a midpoint of the rod 15. The clutch mechanism 22 is configured to separate the rod 15 into the upper rod 15a and the lower rod 15b when the discharge valve 12 is lifted by a predetermined distance along with the rod 15. In a state in which the clutch mechanism 22 is separated, the lower rod 15b does not move in conjunction with motion of the piston 14b and an upper portion of the upper rod 15a, and the lower rod 15b is lowered due to a gravity along with the discharge valve 12 while working against the buoyant force.
Also, a discharge valve float mechanism 26 is provided in the vicinity of the discharge valve 12. The discharge valve float mechanism 26 is configured such that a delay is applied to the lower rod 15b and the discharge valve 12 being lowered and causing the drain port 10a to be closed after the rod 15 is lifted by a predetermined distance and the lower rod 15b is separated by the clutch mechanism 22. Specifically, the discharge valve float mechanism 26 includes a float portion 26a and an engaging portion 26b that moves in conjunction with the float portion 26a.
The engaging portion 26b is configured to establish engagement with the lower rod 15b separated and lowered by the clutch mechanism 22 and prevent the lower rod 15b and the discharge valve 12 from being lowered and seated in the drain port 10a. Then, when the float portion 26a is lowered along with lowering of a water level in the reservoir tank 10, and the water level in the reservoir tank 10 is lowered to a predetermined water level, then the float portion 26a causes the engaging portion 26b to turn, and the engagement between the engaging portion 26b and the lower rod 15b is released. Through the release of the engagement, the lower rod 15b and the discharge valve 12 are lowered and are seated in the drain port 10a. In this manner, the closing of the discharge valve 12 is delayed, and an appropriate amount of flush water is drained from the drain port 10a.
Also, as illustrated in
Next, the discharge valve control valve 18 includes a control valve main body portion 18a, a main valve body 18b disposed in the control valve main body portion 18a, and a pilot valve port 18c (
In other words, the discharge valve control valve 18 controls supply and stopping of the supplied flush water to the discharge valve water pressure drive portion 14. In the present embodiment, the entire amount of flush water flowing out from the discharge valve control valve 18 is supplied to the discharge valve water pressure drive portion 14 through the inlet pipe 23 as illustrated in
On the other hand, the flush water supplied from the tap water C is supplied to the discharge valve control valve 18 via a stop cock 32a, a fixed flow valve 32b, a water supply pipe branching portion 33, and a first branching pipe 33a as illustrated in
The stop cock 32a is provided to stop water supply to the flush water tank device 4 at the time of maintenance or the like and is typically used in an opened state. The fixed flow valve 32b is provided to allow water supplied from the tap water C to flow into the discharge valve control valve 18 and the water supply control valve 19 at a predetermined flow rate and is configured such that water is supplied at a constant flow rate regardless of an installation environment of the flush toilet apparatus 1.
On the other hand, a second branching pipe 33b branched by the water supply pipe branching portion 33 is connected to the water supply control valve 19.
The water supply control valve 19 is configured to cause water supplied from the second branching pipe 33b to flow out to a rim water supply pipe 25. The rim water supply pipe 25 communicates with the rim spout port 2d of the flush toilet main body 2 (not illustrated in
The water supply control valve 19 includes a water supply valve main body portion 19a, a main valve body 19b disposed in the water supply valve main body portion 19a, and a pilot valve port 19c (
Next, newly referring to
As illustrated in
In other words, since the pilot valve port 19c is closed by the pilot valve portion 16c of the drive arm member 16a in a state in which the drive arm member 16a has been moved to the stopping position, the pressure in the pressure chamber 19d of the water supply control valve 19 increases, and the main valve body 19b of the water supply control valve 19 is closed. On the other hand, since the pilot valve port 19c is opened in a state in which the drive arm member 16a has been moved to the ejection position, the pressure in the pressure chamber 19d decreases, and the main valve body 19b opened. Also, the drive arm member 16a of the water supply valve driving mechanism 16 is moved from the stopping position to the ejection position by the user operating the lever handle 8 (
As illustrated in
Note that in the present embodiment, the biasing mechanism 17 includes the small tank 17a and the biasing float 17b and generates a biasing force by the buoyant force acting on the biasing float 17b. In regard to this, it is also possible to configure the biasing mechanism 17 such that the biasing force is generated by an elastic member such as a coil spring in a modification example.
The holding mechanism 20 includes a holding mechanism main body portion 20a, an engaging member 20b that is attached to the holding mechanism main body portion 20a, and an engaged member 20c that is engaged with the engaging member 20b as illustrated in
The engaged member 20c is a plate-shaped member fixed at a position where it faces the holding mechanism main body portion 20a and is provided with an opening 20f for receiving the engaging member 20b. When the drive arm member 16a is turned about the support portion 16b by the user operating the lever handle 8, then the biasing rod 17c and the holding mechanism main body portion 20a attached thereto are pushed downward as illustrated in the section (a) of
If the holding mechanism main body portion 20a is further pushed downward, and the drive arm member 16a is moved to the ejection position, the engaging member 20b is moved to a position at which it matches the opening 20f provided in the engaged member 20c. When the engaging member 20b matches the opening 20f of the engaged member 20c, then the engaging member 20b projects to the inside of the opening 20f of the engaged member 20c due to the biasing force of the spring 20d as illustrated in the section (c) of
Next, a configuration of the releasing mechanism 21 will be described.
As illustrated in
The releasing arm member 21a is supported such that the releasing arm member 21a is rotatable about the support portion 21b and is configured to be moved between a released position illustrated by the solid line in
Also, as illustrated in
On the other hand, the water receiving portion 21c is connected to the other end portion of the releasing arm member 21a as illustrated in
The water receiving portion 21c is a cup-shaped member that opens on the upper side and is configured such that flush water that has been branched from the rim water supply pipe 25 by the branching portion 25a and has flowed to the downcomer 25b flows into the water receiving portion 21c. Also, the bottom portion of the water receiving portion 21c is provided with a discharge hole 21h, and the flush water that has flowed into the water receiving portion 21c is drained from the discharge hole 21h into the reservoir tank 10. Here, the flow rate of the flush water that flows from the downcomer 25b into the water receiving portion 21c is higher than the flow rate of the flush water that flows out from the discharge hole 21h, and in a state in which the flush water flows in from the downcomer 25b, the water level of the flush water in the water receiving portion 21c increases.
The balance float 21d is a float attached to a lower side of the water receiving portion 21c via the connecting portion 21e. The balance float 21d is configured to receive a buoyant force from the flush water retained in the reservoir tank 10 and push the water receiving portion 21c upward. In a case in which the flush water is not retained in the water receiving portion 21c, the water receiving portion 21c is brought into a state in which the balance float 21d is pushed upward by the buoyant force. In this state, the releasing arm member 21a connected to the water receiving portion 21c has been moved to the non-released position.
On the other hand, when the flush water flows from the downcomer 25b into the water receiving portion 21c, the weight of the water receiving portion 21c increases, and the balance float 21d is pushed downward by the water receiving portion 21c. When the weight of the water receiving portion 21c increases and overcomes the buoyant force acting on the balance float 21d due to the flush water flowing into the water receiving portion 21c, then the releasing arm member 21a is moved to the released position. When the releasing arm member 21a is moved to the released position, the pilot valve port 18c is opened, and the main valve body 18b of the discharge valve control valve 18 is thus opened.
Note that since the water receiving portion 21c is connected to the upper side of the balance float 21d via the connecting portion 21e, the water receiving portion 21c is still located above the stopped water level L1 in the reservoir tank 10 even in a state in which the flush water has flowed in and the position of the water receiving portion 21c has been lowered. Therefore, the water receiving portion 21c itself does not receive the buoyant force from the flush water in the reservoir tank 10, and the water receiving portion 21c can effectively push the balance float 21d downward by the flush water flowing thereinto.
Next, newly referring to
First, in a toilet washing standby state at a clock time t0 in
Next, when the user operates the lever handle 8 (
On the other hand, the biasing mechanism 17 biases the holding mechanism main body portion 20a upward using the buoyant force acting on the biasing float 17b, and the holding mechanism main body portion 20a is kept at the pushed-down position through the engagement of the engaging member 20b with the engaged member 20c. In this manner, the holding mechanism 20 holds the drive arm member 16a of the water supply valve driving mechanism 16 that has been moved to the ejection position at the ejection position against the biasing force of the biasing mechanism 17 by the engaging member 20b establishing engagement with the engaged member 20c.
If the drive arm member 16a of the water supply valve driving mechanism 16 is moved to the ejection position, the pilot valve port 19c (
If the amount of flush water that has flowed in from the downcomer 25b and has been retained in the water receiving portion 21c exceeds a predetermined amount at a clock time t2 in
If the discharge valve control valve 18 is opened, the tap water supplied from the water supply pipe 32 to the discharge valve control valve 18 via the water supply pipe branching portion 33 and the first branching pipe 33a flows into the inlet pipe 23 (
The flush water retained in the reservoir tank 10 flows out through the drain port 10a by the drain port 10a being opened and is ejected as “jet ejected water” from the jet spout port 2b (
In this manner, in the flush toilet apparatus 1 according to the present embodiment, the supply of the flush water from the rim spout port 2d is continued even during occurrence of the siphon phenomenon by the flush water drained from the jet spout port 2b. Therefore, it is possible to prevent an excessive decrease in retained water in the bowl 2a due to retained water drawing in through the siphon phenomenon, which leads to interruption of sealed water in the water discharge trap pipe 2e. When the sealed water in the water discharge trap pipe 2e is interrupted, there is a concern that odor flows backward from the water discharge trap pipe 2e. However, it is possible to prevent this in the present embodiment. Also, since the supply of the flush water from the rim spout port 2d is continued even during occurrence of the siphon phenomenon, the sealed water is not interrupted, and it is possible to continue the siphon phenomenon and thereby to prevent the siphon phenomenon from ending in the process.
On the other hand, when the piston 14b is pushed upward by the discharge valve water pressure drive portion 14, and in response with this, the rod 15 and the discharge valve 12 are pulled upward to predetermined positions, then the clutch mechanism 22 separates the lower rod 15b and the discharge valve 12 from the upper rod 15a. In this manner, the upper rod 15a is maintained to be pushed upward along with the piston 14b when the discharge valve control valve 18 is opened, while the lower rod 15b and the discharge valve 12 are lowered due to their own weights. However, the separated lower rod 15b establishes engagement with the engaging portion 26b of the discharge valve float mechanism 26, and lowering of the lower rod 15b and the discharge valve 12 are prevented. In this manner, the drain port 10a of the reservoir tank 10 is maintained to be opened even after the clutch mechanism 22 is separated, and water discharge from the reservoir tank 10 is continued.
Also, when the flush water flows from the inlet pipe 23 into the cylinder 14a of the discharge valve water pressure drive portion 14, and the piston 14b is pushed upward to the upper portion of the cylinder 14a, the flush water in the cylinder 14a flows out through the outlet pipe 24 (
On the other hand, when the releasing arm member 21a is moved to the released position, the release end 21g (
Then, when the water level in the reservoir tank 10 is lowered to a predetermined water level by the flush water in the reservoir tank 10 being drained from the drain port 10a, the float portion 26a of the discharge valve float mechanism 26 is lowered, and this causes the engaging portion 26b to move. In this manner, the engagement between the lower rod 15b and the engaging portion 26b is released, and the lower rod 15b and the discharge valve 12 start to move downward again. Then, the drain port 10a of the reservoir tank 10 is closed by the discharge valve 12 at a clock time t3 in
Furthermore, since the discharge valve control valve 18 is in the valve opened state even after the drain port 10a is closed, the water supplied from the water supply pipe 32 flows into the discharge valve water pressure drive portion 14 and flows out to the outlet pipe 24 (
Furthermore, the drive arm member 16a of the water supply valve driving mechanism 16 that has been moved by the biasing rod 17c of the biasing mechanism 17 reaches the stopping position at a clock time t4 after the water ejection from the jet spout port 2b is stopped at the clock time t3 in
Note that in the present embodiment, a part of the remaining flush water that has flowed out from the outlet pipe 24 flows into the overflow pipe 10b through the first downcomer 24b, and this is used as a refill for the bowl 2a. In this regard, it is also possible to adjust water ejection time from the rim spout port 2d of the flush toilet main body 2, for example, and to use the flush water ejected from the rim spout port 2d after the jet water ejection is ended as a refill for the bowl 2a in a modification example.
On the other hand, when the water supply control valve 19 is closed, the flush water flowing into the water receiving portion 21c of the releasing mechanism 21 through the downcomer 25b branched from the rim water supply pipe 25 (
If the amount of flush water in the water receiving portion 21c decreases to a predetermined amount at a clock time t5 in
On the other hand, when the supply of water to the discharge valve water pressure drive portion 14 is stopped by the discharge valve control valve 18 being closed, the piston 14b (
According to the flush water tank device 4 in the embodiment of the present invention, the holding state of the water supply valve driving mechanism 16 is released using flush water supplied from the water supply source such as tap water C and flowing out from the water supply control valve 19 that is a first on-off valve, the water supply valve driving mechanism 16 is moved to the stopped position, and it is thus possible to reliably cause water ejection from the rim spout port 2d to stop at an accurate timing without being affected by the water level in the reservoir tank 10. Also, since the water supply valve driving mechanism 16 is biased by the bias force of the biasing mechanism 17, the bias force is stable without being affected by the water level in the reservoir tank 10, and it is possible to prevent the water supply valve driving mechanism 16 from accidentally moved and to cause the water supply valve driving mechanism 16 to reliably operate.
Also, according to the flush water tank device 4 of the present embodiment, the releasing mechanism 21 causes the holding of the water supply valve driving mechanism 16 to be released on the basis of the amount of flush water flowing out from the water supply control valve 19, and it is thus possible to accurately set a time during which the first on-off valve is opened and to finely control the amount of flush water ejected from the upper spout port.
Furthermore, according to the flush water tank device 4 of the present embodiment, the flush water flowing out from the water supply control valve 19 is branched and supplied to each of the rim spout port 2d and the water receiving portion 21c of the releasing mechanism 21, and it is thus possible to use the flush water supplied from the water supply source and flowing out from the water supply control valve 19 both for washing the flush toilet and for operating the releasing mechanism 21.
Also according to the flush water tank device 4 of the present embodiment, the holding of the water supply valve driving mechanism 16 is released depending on the amount of flush water supplied from the water supply control valve 19 and retained in the water receiving portion 21c, and it is thus possible to release the holding achieved by the holding mechanism 20 on the basis of the amount of flush water with a simple mechanism.
Moreover, according to the flush water tank device 4 of the present embodiment, the releasing mechanism 21 causes the holding of the water supply valve driving mechanism 16 to be released and causes the discharge valve control valve 18 which is a second on-off valve to be opened when the flush water retained in the water receiving portion 21c exceeds the predetermined amount, and it is thus possible to control the discharge valve 12 as well using the flush water flowing out from the water supply control valve 19.
Also, according to the flush water tank device 4 of the present embodiment, the discharge valve water pressure drive portion 14 which is a water pressure driving mechanism that opens and closes the discharge valve 12 is included, and it is thus possible to cause the discharge valve 12 to be opened even with a relatively small amount of flush water flowing out from the discharge valve control valve 18.
Furthermore, according to the flush water tank device 4 of the present embodiment, the bias force of the biasing mechanism 17 is caused by the buoyant force acting on the biasing float 17b, and it is thus possible to reliably cause the bias force with a simple mechanism. Also, since the biasing float 17b is disposed in the small tank 17a, it is possible to cause stable bias force regardless of the water level in the reservoir tank 10.
Also, according to the flush water tank device 4 of the present embodiment, the holding mechanism 20 holds the water supply valve driving mechanism 16 at the ejection position by the engaging member 20b being engaged with the engaged member 20c, and it is thus possible to reliably hold the water supply valve driving mechanism 16 at the ejection position with a simple mechanism.
Moreover, according to the flush water tank device 4 of the present embodiment, the engaging member 20b is biased by the spring 20d which is an elastic member toward the engagement position, and it is thus possible to cause the engaging member 20b to move to the engagement position with a simple mechanism and to cause the holding mechanism 20 to reliably operate.
Also, according to the flush water tank device 4 of the present embodiment, the engaging member 20b is moved toward the engagement released position by the sloped surface 20e of the engaging member 20b sliding along the engaged member 20c, and it is thus possible to reliably cause the engaging member 20b to move with a simple mechanism on the basis of an operation of the user.
Although the embodiments of the present invention have been described hitherto, various modifications can be added to the aforementioned embodiments. For example, although the rim spout port 2d that causes the flush water to be ejected along the wall surface of the rim 2c at the upper end of the bowl 2a is provided as the upper spout port in the aforementioned embodiments, it is possible to use, as the upper spout port, various spout ports provided above the retained water surface W of the flush toilet main body 2. Moreover, although the jet spout port 2b provided at the bottom portion of the bowl 2a to face the inlet of the water discharge trap pipe 2e is provided at the lower spout port in the aforementioned embodiments, it is possible to use, as the lower spout port, various spot ports provided below the retained water surface W of the flush toilet main body 2.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2021-139357 | Aug 2021 | JP | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 20210040717 | Kitaura | Feb 2021 | A1 |
| 20210040718 | Kitaura | Feb 2021 | A1 |
| 20210270023 | Kitaura | Sep 2021 | A1 |
| Number | Date | Country |
|---|---|---|
| H06-146365 | May 1994 | JP |
| Number | Date | Country | |
|---|---|---|---|
| 20230069634 A1 | Mar 2023 | US |
