JP5103200B2 - Bath circulator - Google Patents

Description

  The present invention relates to a circulator for a bathtub that is attached to a side wall of a bathtub and connects a pipe that circulates the bathtub water through an external water heater to the bathtub, and circulates and heats the bathtub water.

  In this kind of bathtub circulation tool, a tightening cylinder inserted from a bathtub into a through-hole provided in a side wall of the bathtub is fastened to an external cylinder outside the bathtub and fixed to the side wall. An adapter in which a passage for sucking bath water and a discharge passage for discharging heated water heated by a water heater is partitioned is inserted and fixed in the tightening cylinder. A filter cover is installed on the outer surface of the adapter to prevent foreign matters such as dust from entering the suction passage. In general, the convex portion provided on the inner surface of the filter cover and the convex portion provided on the adapter are locked by deformation of an elastic deformation portion formed on the adapter, and the filter cover is prevented from coming off. However, if the filter cover is repeatedly attached and detached to clean the circulator for bathtubs, there is a problem that the elastically deforming portion is gradually deformed or damaged.

Measures for solving such problems are being studied. More specifically, the filter cover (filter member) is held by retaining the convex portion of the filter cover and the engaging convex portion of the adapter (adapter head) (for example, Patent Document 1). reference). That is, a stainless steel having a protrusion projecting inwardly on the inner peripheral surface of the filter member, and an engaging convex portion that allows the convex portion of the filter member to pass through elastic deformation on the outer peripheral surface of the adapter head. A leaf spring made of plastic is attached so as to be elastically deformable.
Japanese Patent No. 37099796 (first page, fourth page and sixth page)

  However, in the bathtub circulation tool described in Patent Document 1, since the plate spring of the adapter head is formed of stainless steel in order to prevent plastic deformation, the work of assembling the plate spring to the adapter head is difficult. In addition to being very troublesome, there are disadvantages that the working time is long, the production efficiency is poor, and the production cost is increased.

  Accordingly, an object of the present invention is to provide a circulator for a bathtub which has an elastically deformable portion reinforced and has durability, can be simplified in structure, can improve manufacturing efficiency, and can reduce manufacturing cost. There is to do.

  In order to achieve the above object, the bathtub circulation device according to the first aspect of the present invention is fixed in a state of being penetrated through the side wall of the bathtub, and the circulation of the bathtub water between the external water heater and the inside of the bathtub. It is the circulation tool for bathtubs for making it perform. A fastening cylinder that is fastened to an external cylinder outside the bathtub and fixed to the side wall in a state of being inserted into the through-hole provided in the side wall of the bathtub, and inserted into the fastening cylinder. And an adapter having a discharge passage for discharging the heated water heated by the bath water suction and the hot water heater into the bathtub, and a filter cover is attached to the outer surface of the adapter. Engagement protrusions projecting radially inward are provided on the inner peripheral surface of the filter cover, and the outer peripheral portion of the adapter is cantilevered by the adapter body and extends in the circumferential direction to elastically deform in the radial direction. A guide holding portion for guiding and holding the engagement protrusion of the filter cover is provided on the outer peripheral surface of the elastic deformation portion, and a reinforcing rib having a spring property is integrally formed between the elastic deformation portion and the adapter body. Built in It is characterized in.

The bathtub circulation device according to claim 2 is characterized in that, in claim 1, the reinforcing rib has a U-shape.
According to a third aspect of the present invention, in the circulator for a bathtub according to the first or second aspect, the reinforcing rib is formed by connecting a pair of rib pieces forming a U-shape at the ends, The inner angle is set to an acute angle.

According to a fourth aspect of the present invention, in the circulator for a bathtub according to any one of the first to third aspects, the reinforcing rib is formed in a thin piece shape.
The bathtub circulation device according to claim 5 is the invention according to any one of claims 1 to 4, wherein the reinforcing rib is provided between the distal end side of the elastic deformation portion and the adapter main body. It is characterized by.

  The bathtub circulation device according to claim 6 is the invention according to any one of claims 3 to 5, wherein the reinforcing rib is formed such that a cross-sectional shape of the connecting portion of the pair of rib pieces is an acute angle on the inner surface. The outer surface is formed in an arc shape.

According to the present invention, the following effects can be exhibited.
In the bathtub circulator according to claim 1, the outer periphery of the adapter in which the suction passage and the discharge passage are defined is cantilevered by the adapter body and extends in the circumferential direction and elastically deforms in the radial direction. A deformable portion is provided, and a reinforcing rib having a spring property is integrally built between the elastically deformable portion and the adapter main body. For this reason, the elastic deformation of the elastic deformation portion is reinforced by the reinforcing rib, and the durability of the elastic deformation portion can be improved. In addition, unlike conventional stainless steel leaf springs, the reinforcing ribs can be integrally formed of the same material as the elastically deforming portion and the adapter body, so that the configuration can be simplified and the production efficiency can be improved. Manufacturing costs can be reduced.

In the circulator for bathtubs according to claim 2, the reinforcing rib has a dogleg shape. For this reason, in addition to the effect of the invention according to claim 1, the reinforcing rib can be easily deformed (bent).
In the circulator for a bathtub according to claim 3, the reinforcing rib is formed by connecting a pair of rib pieces forming a U-shape at the ends, and the angle formed between the inner sides of both rib pieces is set to an acute angle. . For this reason, in addition to the effect of the invention according to claim 1 or claim 2, the reinforcing rib can be easily bent, and the elastic deformation of the elastic deformation portion can be smoothly performed in a stable state.

  In the bathtub circulation device according to claim 4, since the reinforcing rib is formed in a thin piece shape, in addition to the effect of the invention according to any one of claims 1 to 3, deformation of the reinforcing rib is easier. The elastic deformation of the elastic deformation portion can be performed more smoothly.

  In the circulator for bathtub of claim 5, since the reinforcing rib is provided between the tip end side of the elastically deformable portion and the adapter main body, in addition to the effects of the invention according to any one of claims 1 to 4. Thus, the elastic deformation of the elastic deformation portion can be effectively received.

  In the circulator for a bathtub according to claim 6, the reinforcing rib is formed such that the cross-sectional shape of the connecting portion of the pair of rib pieces is an acute angle on the inner surface and an arc shape on the outer surface. Therefore, in addition to the effects of the invention according to any one of claims 3 to 5, the reinforcing rib can be easily bent by the inner surface shape of the reinforcing rib, and the durability of the reinforcing rib can be increased by the outer surface shape of the reinforcing rib. Can be improved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments that are considered to be the best of the present invention will be described below in detail with reference to the drawings.
As shown to Fig.5 (a) and (b), the circulator 11 for bathtubs of this embodiment is the fastening cylinder 14 inserted from the inside into the through-hole 13 provided in the side wall 12 of the bathtub, and a side wall. 12, an external cylinder 15 disposed outside the adapter 12, an adapter 16 inserted and fixed to the fastening cylinder 14, and a filter cover 17 attached to the adapter 16. The circulator 11 for bathtubs of this embodiment is a polar thing, the piping 18 from a water heater and the piping 19 (refer FIG.6 (b)) to a water heater, and the discharge opening of the circulator 11 for bathtubs The connection port 22 that communicates with the portion 38 and the connection port 20 that communicates with the suction opening 37 are determined in advance.

  As shown in FIGS. 5A, 5B and 6A, 6B, the outer cylinder 15 is made of a metal such as brass or a synthetic resin such as polyphenylene sulfide (PPS), and its rear end portion. The connection port 20 connected to the piping 19 of the forced circulation piping of the hot water heater disposed outside the bathtub and the connection port 22 connected to the piping 18 are provided at the left end of FIG. Yes. An O-ring 24 is fitted on the inner periphery of the connection port 22. A female thread portion 25 is threaded on the inner peripheral surface of the open end portion of the outer cylinder 15. A flange portion 26 is provided at the opening end portion of the outer cylinder 15, and the flange portion 26 is covered with a sealing material 27, and watertightness between the outer surface of the side wall 12 is ensured.

  The fastening cylinder 14 is formed in a cylindrical shape from a synthetic resin such as polyacetal, and a flange 28 projects from the front end (the right end in FIGS. 5A and 5B). A male threaded portion 29 is threaded on the outer peripheral surface of the tightening cylinder 14, and the male threaded portion 29 is threadedly engaged with the female threaded portion 25 of the outer cylinder 15, so that the tightening cylinder 14 and the outer cylinder 15 are connected to the bathtub. The side walls 12 are connected and fixed. A plurality of detent ridges 30 extending in the axial direction are provided on the inner peripheral surface of the tightening cylinder 14. An annular engagement groove 31 is recessed in the outer peripheral surface of the flange 28. A rubber packing 32 is sandwiched between the flange 28 and the inner surface of the side wall 12 to ensure watertightness between the two.

  The adapter 16 is formed in a substantially cylindrical shape from a synthetic resin such as polyacetal, and a slip-off preventing claw 33 (see FIG. 4C) extending in the circumferential direction projects from the inner peripheral surface of the front end portion thereof. The cylindrical body 14 is adapted to be engaged with the annular engaging groove 31. The adapter 16 is prevented from coming off due to the engagement between the adapter 16 and the annular engagement groove 31 of the tightening cylinder 14.

  As shown in FIGS. 1 (a) to 1 (c), a discharge passage 34 connected to a connection port 22 provided at the center of the external cylinder 15 is provided at the center of the adapter 16, A suction passage 35 connected to the connection port 20 of the outer cylinder 15 is provided around the periphery. A partition wall 36 that partitions the flow of water is provided between the suction passage 35 and the discharge passage 34. A suction opening 37 is provided in front of the suction passage 35, and a discharge opening 38 whose direction is changed by 90 degrees in front of the discharge passage 34 (downward in FIG. 1B). Is provided. A plurality of positioning protrusions 40 for positioning are provided in the circumferential direction at the front portion of the adapter 16, and the rotation of the adapter 16 in the circumferential direction is restricted by engaging with the anti-rotation protrusion 30 of the fastening cylinder 14. Has been.

  2 (a) and 2 (b), the outer periphery of the adapter 16 is cantilevered by the adapter body 16a at the right end of FIG. 2 (b) and extends leftward in the circumferential direction. An elastic deformation portion 41 that elastically deforms is projected. A guide holding portion 60 that guides and holds the engagement protrusion 43 of the filter cover 17 is provided on the outer peripheral surface of the elastic deformation portion 41. The guide holding portion 60 extends in the axial direction of the adapter 16 and guides the engaging protrusion 43, the locking protrusion 45 extending in the axial direction at a position adjacent to the guide groove 44 in the circumferential direction, and the engagement A holding groove 46 formed at a position adjacent to the stop protrusion 45 in the circumferential direction, a restriction piece 47 extending in the circumferential direction, and a restriction protrusion 48 extending in the axial direction are configured. Then, the engagement protrusion 43 of the filter cover 17 gets over the locking protrusion 45 from the guide groove 44 and reaches the holding groove 46 to be held at that position, and the withdrawal is restricted. The top of the locking protrusion 45 is formed in a circular arc shape so that the engagement protrusion 43 of the filter cover 17 can easily get over the locking protrusion 45. Here, the alignment groove 44 a located at the center of the guide groove 44 is formed in a belt shape deeper than the guide groove 44 and extending in the axial direction, and is used for alignment (marking) with the engagement protrusion 43 of the filter cover 17. It is like that. It is also possible to make the determination easy by painting the portion of the alignment groove 44a in red.

  Between the distal end portion of the elastic deformation portion 41 and the adapter main body 16a, a flaky reinforcing rib 49 having a dogleg shape (cross-section-guelle shape) and having spring properties is integrally constructed. The reinforcing rib 49 is provided at the front end portion (the end portion on the filter cover 17 side) of the elastic deformable portion 41 that is most susceptible to the force from the elastic deformable portion 41 by the engaging protrusion 43 so that its function can be effectively exhibited. Yes. In addition, the reinforcing rib 49 is configured to be convex toward the proximal end side of the elastic deforming portion 41, and the connecting portion of the reinforcing rib 49 to the elastic deforming portion 41 and the adapter main body 16a is provided on the distal end side of the elastic deforming portion 41 as much as possible. Can do. For this reason, the elastic deformation of the elastic deformation portion 41 can be performed in a stable state. The reinforcing rib 49 is integrally formed with the adapter main body 16a and the elastic deformation portion 41 by a molding method such as an injection molding method.

  The reinforcing rib 49 is formed by connecting a pair of rib pieces 49a and 49b forming a U-shape at the ends, and the angle formed between the rib pieces 49a and 49b is set to an acute angle, for example, 40 °. Further, the elastic deformation of the elastic deformation portion 41 is supported to improve durability, and the reinforcing rib 49 is easily deformed (bent) to assist the elastic deformation of the elastic deformation portion 41. The angle is preferably about 30 to 60 °, and most preferably 40 °. When this angle is smaller than 30 ° or larger than 60 °, the urging force of the reinforcing rib 49 becomes weak and the elastic deformation portion 41 is not sufficiently supported and reinforced. Further, the cross-sectional shape of the connecting portion 50 of the pair of rib pieces 49a, 49b is formed as an acute angle on the inner surface, and formed in an arc shape on the outer surface, and the reinforcing rib 49 is easily bent by the inner surface shape. The durability of the reinforcing rib 49 is increased.

  The thickness of the reinforcing rib 49 is set to about 0.7 mm, for example. This thickness is preferably 0.5 to 2.5 mm. When the thickness is less than 0.5 mm, the reinforcing rib 49 becomes too thin and its urging force is weak, and the elastic deformation portion 41 cannot be sufficiently supported and reinforced. On the other hand, if it exceeds 2.5 mm, the reinforcing rib 49 becomes too thick to bend easily, and the elastic deformation of the elastic deformation portion 41 becomes difficult.

  A stainless steel filter cover 17 is attached to the front portion of the adapter 16. As shown in FIGS. 3A to 3D, the filter cover 17 has a bottomed cylindrical shape, and is integrally formed with a front plate 52 having a number of flow holes 51 and a peripheral wall plate 53 extending rearward from the periphery thereof. Has been. Engagement projections 43 having a substantially hemispherical shape are projected at three locations on the inner peripheral surface of the peripheral wall plate 53, and are aligned and fitted in the guide groove 44 of the adapter 16 before rotating the filter cover 17 in the circumferential direction. The filter cover 17 is configured to be restricted from moving in the circumferential direction and the axial direction by being moved and over the locking ridge 45 to be positioned in the holding groove 46. As shown in FIGS. 3C and 3D, an insertion hole 54 is opened at one place on the peripheral wall plate 53 of the filter cover 17, and communicates with the discharge opening 38 of the adapter 16. Yes.

  When the bathtub circulation tool 11 configured as described above is attached and fixed to the side wall 12 of the bathtub, the through hole 13 provided in the side wall 12 of the bathtub is tightened from the inside as shown in FIG. The attached cylindrical body 14 is inserted with the packing 32 inserted, and the male threaded portion 29 is screwed into the female threaded portion 25 of the external cylindrical body 15 disposed outside the side wall 12 to be fastened and fixed. Next, the removal preventing claw 33 of the adapter 16 is engaged with the annular engagement groove 31 of the tightening cylinder 14 so that the suction passage 35 of the adapter 16 is inserted into the tightening cylinder 14. In this way, the suction passage 35 is connected to the connection port 20 of the external cylinder 15 and the discharge passage 34 is connected to the connection port 22 of the external cylinder 15.

  Subsequently, by fixing the filter cover 17 to the adapter 16, the tub circulating tool 11 is configured as shown in FIG. Then, the connection port 20 of the external cylinder 15 is connected to the pipe 19 and the connection port 22 is connected to the pipe 18. In this state, when the bathtub water is circulated by a hot water heater outside the bathtub, the bathtub water is sucked from the front surface of the filter cover 17, flows into the suction passage 35 through the suction opening 37, and further passes through the pipe 19. Flows into the bowl. The heated water heated by the water heater is discharged from the pipe 18 through the discharge passage 34 and from the discharge opening 38 into the bathtub through the insertion hole 54 of the filter cover 17.

Next, an effect | action is demonstrated about the circulating tool for bathtubs of this embodiment.
When the filter cover 17 is attached to the adapter 16, the engagement protrusion 43 of the filter cover 17 is aligned with the guide groove 44 of the elastic deformation portion 41 of the adapter 16, as shown in FIG. The filter cover 17 is pressed and fitted into the adapter 16 side. Subsequently, as shown in FIG. 4B, the filter cover 17 is rotated in the circumferential direction (left direction in the figure), and the engaging protrusion 43 is brought into contact with the locking protrusion 45 of the adapter 16.

  Next, as shown in FIG. 4C, when the filter cover 17 is further rotated in the circumferential direction, the engagement protrusion 43 rides on the locking protrusion 45. At this time, since the elastic deformation portion 41 is pressed radially inward, the distal end portion of the elastic deformation portion 41 is elastically deformed radially inward around the base end portion. At the same time, the reinforcing rib 49 is urged radially inward by the elastic deformation of the elastic deformation portion 41, and is bent so that the pair of rib pieces 49a and 49b approach each other. For this reason, the elastic deformation of the elastic deformation portion 41 is supported and reinforced by the reinforcing rib 49. Therefore, even if the filter cover 17 is repeatedly attached to and detached from the adapter 16, it can sufficiently withstand.

  Next, as shown in FIG. 4D, when the filter cover 17 is further rotated in the circumferential direction, the engagement protrusion 43 is guided to the holding groove 46 of the elastic deformation portion 41. When the engaging protrusion 43 reaches the holding groove 46, the engaging protrusion 43 is positioned and held at that position by the locking protrusion 45, the restricting protrusion 48 and the restricting piece 47 of the elastic deformation portion 41. In that case, the elastic deformation portion 41 returns to its original position because the pressing force radially inward is released. At this time, the reinforcing rib 49 is urged inward in the radial direction by the urging force from the elastic deformation portion 41, and thus urges the elastic deformation portion 41 in a direction to return it to the original state. Accordingly, the elastic deformation of the elastic deformation portion 41 can be performed in a stable state. In this way, the attachment of the filter cover 17 to the adapter 16 is completed.

The effects exhibited by the above embodiment will be described collectively below.
-In the circulator 11 for bathtubs in embodiment, the outer peripheral part of the adapter 16 is provided with the elastic deformation part 41 which is cantilevered by the adapter main body 16a, and extends in the circumferential direction and elastically deforms in the radial direction. A reinforcing rib 49 having a spring property is integrally provided between 41 and the adapter main body 16a.

  For this reason, the elastic deformation of the elastic deformation portion 41 is reinforced by the reinforcing ribs 49, and the durability of the elastic deformation portion 41 can be improved. Further, unlike the conventional stainless steel leaf spring, the reinforcing rib 49 can be integrally formed of the same material as the elastic deformation portion 41 and the adapter main body 16a, so that the configuration can be simplified and the production efficiency can be improved. It is possible to improve the manufacturing cost.

Since the reinforcing rib has a dogleg shape, it can be bent easily.
The reinforcing rib 49 is formed by connecting a pair of rib pieces 49a and 49b forming a U-shape at the ends, and the angle formed between the rib pieces 49a and 49b is set to an acute angle. The reinforcing rib 49 can be easily bent, and the elastic deformation portion 41 can be smoothly elastically deformed in a stable state.

The reinforcement rib 49 is formed in a thin piece shape, so that the reinforcement rib 49 can be more easily deformed, and the elastic deformation portion 41 can be more smoothly deformed.
The reinforcing rib 49 is provided between the distal end side of the elastic deformation portion 41 and the adapter main body 16a, so that the elastic deformation of the elastic deformation portion 41 can be effectively received.

  The reinforcing rib 49 is formed by forming the cross-sectional shape of the connecting portion 50 of the pair of rib pieces 49a and 49b into an acute angle shape on the inner surface and an arc shape on the outer surface, so that the reinforcing rib 49 has the inner shape of the reinforcing rib 49. 49 can be easily bent, and the durability of the reinforcing rib 49 can be improved by the outer shape of the reinforcing rib 49.

By providing the reinforcing rib 49, it is possible to prevent deformation of the elastic deformation portion 41 due to sink marks or the like in the restriction piece 47 of the elastic deformation portion 41 during molding.
In addition, this embodiment can also be changed and embodied as follows.

  As shown in FIG. 7A, a cutout 55 having a rectangular cross section (concave shape) can be formed inside the connecting portion 50 of the rib pieces 49a and 49b of the reinforcing rib 49. When configured in this manner, the reinforcing rib 49 can be easily bent.

  As shown in FIG. 7B, a notch 56 having a circular arc cross section can be formed inside the connecting portion 50 of the rib pieces 49a, 49b of the reinforcing rib 49. In this case, the reinforcement rib 49 can be easily bent.

  -As shown in FIG.7 (c), the rib pieces 49a and 49b of the reinforcement rib 49 can be formed in a taper shape so that the base end side may be thick and the connection part 50 side may be thin. In this case, it is possible to facilitate bending while maintaining the strength of the reinforcing rib 49.

  The width of the reinforcing rib 49 can be set as appropriate until reaching the width of the elastic deformation portion 41, and can be set to be half the width of the elastic deformation portion 41 or the same as the elastic deformation portion 41. is there.

The reinforcing rib 49 can be configured to be convex toward the distal end side of the elastic deformation portion 41.
The reinforcing rib 49 can be configured in a shape having a spring property such as a W-shaped section or a corrugated section.

  -As the circulation device 11 for a bathtub, a non-polar type in which the connection between the piping 18 from the water heater and the piping 19 to the water heater, and the connection port 22 and the connection port 20 of the circulation device 11 for the bathtub are not defined. Things can also be used.

Further, the technical idea that can be grasped from the embodiment will be described below.
-The circulator for bathtubs according to any one of claims 1 to 5, wherein the reinforcing rib is formed so as to protrude toward the base end side of the elastically deformable portion. In this case, in addition to the effect of the invention according to any one of claims 1 to 5, the connecting portion of the reinforcing rib with respect to the elastic deformation portion and the adapter main body may be provided as far as possible on the distal end side of the elastic deformation portion. The elastic deformation of the elastic deformation portion can be performed in a stable state.

  The circulator for a bathtub according to any one of claims 1 to 5, wherein the reinforcing rib is provided at an end portion of the elastic deformation portion on a filter cover side. When constituted in this way, in addition to the effect of the invention according to any one of claims 1 to 5, the function of the reinforcing rib can be most effectively exhibited.

  The guide holding portion extends in the axial direction of the adapter and guides the engagement protrusion of the filter cover; a locking protrusion extending in the axial direction at a position adjacent to the guide groove in the circumferential direction; and the locking A holding groove formed at a position adjacent to the protrusion in the circumferential direction and a restriction extending in the circumferential direction to restrict the engagement protrusion guided to the holding groove through the guide groove and the locking protrusion. The circulator for bathtubs according to any one of claims 1 to 5, wherein the circulator is composed of a piece and a regulating protrusion extending in the axial direction. In this case, in addition to the effect of the invention according to any one of claims 1 to 5, the engagement protrusion of the filter cover passes from the guide groove to the retaining protrusion and reaches the holding groove. Held in.

(A) is the left view which shows an adapter, (b) is sectional drawing which shows an adapter, (c) is the right view which shows an adapter. (A) is a top view which expands and shows the elastic deformation part of an adapter, (b) is a front view which expands and shows the elastic deformation part and reinforcement rib of an adapter. (A) is a left side view showing the filter cover, (b) is a cross-sectional view showing the filter cover, (c) is a right side view showing the filter cover, and (d) is a bottom view showing the filter cover. (A)-(d) is a figure for demonstrating the effect | action of the circulation tool for bathtubs, Comprising: The left view which shows an adapter. (A) is sectional drawing which decomposes | disassembles and shows the circulation tool for bathtubs, (b) is sectional drawing which shows the assembly | attachment state of the circulation tool for bathtubs. (A) is a front view which shows the circulation tool for bathtubs of an assembly state, (b) is a left view of the circulation tool for bathtubs. (A)-(c) is a figure which shows another example of this invention, Comprising: The front view which expands and shows the elastic deformation part and reinforcement rib of an adapter.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Circulation tool for bathtubs, 12 ... Side wall, 13 ... Through-hole, 14 ... Clamping cylinder, 15 ... External cylinder, 16 ... Adapter, 16a ... Adapter main body, 17 ... Filter cover, 34 ... Discharge passage, 35 DESCRIPTION OF REFERENCE SYMBOLS: Inhalation passage 41: Elastic deformation part 43 ... Engagement protrusion 49 ... Reinforcement rib 49a, 49b ... Rib piece 50 ... Connection part 60 ... Guide holding part

Claims (6)

It is a circulator for a bathtub that is fixed in a state of being penetrated by a side wall of the bathtub and circulates the bathtub water between an external water heater and the inside of the bathtub,
A tightening cylinder that is fastened to an external cylinder outside the bathtub and fixed to the side wall while being inserted from the inside of the bathtub into a through-hole provided in the side wall of the bathtub, and is inserted and fixed in the tightening cylinder A bath water suction passage and an adapter having a discharge passage for discharging heated water heated by the water heater into the bathtub, and a filter cover is mounted on the outer surface of the adapter, the filter cover The inner peripheral surface of the adapter is provided with an engaging protrusion that protrudes radially inward, and an outer peripheral portion of the adapter has an elastic deformation portion that is cantilevered and supported by the adapter body and elastically deforms in the radial direction. A guide holding portion for guiding and holding the engagement protrusion of the filter cover is provided on the outer peripheral surface of the elastic deformation portion, and a reinforcing rib having a spring property is integrally installed between the elastic deformation portion and the adapter body. What Tub circulation tool for the butterflies. The circulator for bathtubs according to claim 1, wherein the reinforcing rib has a U-shape. 2. The reinforcing rib is configured by connecting a pair of rib pieces forming a dogleg shape at an end, and an angle formed between the inner sides of both rib pieces is set to an acute angle. The circulation tool for bathtubs according to claim 2. The said reinforcing rib is formed in the shape of a thin piece, The circulation tool for bathtubs of any one of Claims 1-3 characterized by the above-mentioned. The circulator for a bathtub according to any one of claims 1 to 4, wherein the reinforcing rib is provided between a distal end side of the elastically deformable portion and the adapter main body. 6. The reinforcing rib according to any one of claims 3 to 5, wherein a cross-sectional shape of the connecting portion of the pair of rib pieces is formed to have an acute angle on the inner surface and an arc on the outer surface. The circulation tool for bathtubs as described in.

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