JP7650773B2 - Shower head - Google Patents

Description

The present invention relates to a showerhead. More specifically, the present invention relates to a showerhead that includes a housing that includes a head portion that serves as a water spray section and a grip portion that extends cylindrically from the peripheral wall of the head portion, and a cylindrical flow path member that is incorporated inside the housing and forms a flow path for hot and cold water.

Patent Document 1 discloses a shower head for use in a bathroom. This shower head comprises a housing with a head section and a grip section, and a flow path member that is incorporated into the housing and forms a flow path for hot and cold water. The flow path member is divided into a head-side flow path section that is provided in the head section of the housing, and a grip-side flow path section that is provided in the grip section.

The head-side flow passage is inserted through an opening in the head of the housing before the water sprinkler plate is attached and fixed inside the head. The grip-side flow passage is inserted through an opening on the base end side into the grip of the housing and is screwed into and connected to the head-side flow passage, thereby being fixed inside the grip.

Patent No. 6470943

When considering a configuration in which a water purification cartridge is installed between the head-side flow path section and the grip-side flow path section, there is a risk that these may be difficult to assemble. Therefore, the present invention provides a showerhead that can be assembled in a state in which the water purification cartridge and flow path member are properly connected to the flow path inside the grip section of the housing.

In order to solve the above problems, the showerhead of the present invention takes the following measures. That is, the showerhead comprises a housing having a head portion that serves as a water spray portion and a grip portion that extends cylindrically from the peripheral wall of the head portion, and a cylindrical flow path member that is incorporated inside the housing and forms a flow path for hot and cold water. The flow path member has a head side flow path that is fixed inside the head portion and extends into the grip portion, and a grip side flow path that is directly or indirectly flow-connected to the head side flow path from the base end side in the cylindrical axis direction within the grip portion. The showerhead further comprises a water purification cartridge that is set in a state in which the head side flow path and the grip side flow path are flow-connected in the cylindrical axis direction, and a locking member that is fitted from the outside in the cylindrical diameter direction into a through hole formed in the cylindrical wall of the grip portion and engages with the grip side flow path in a state that restricts movement in the cylindrical axis direction relative to the grip portion.

According to the above configuration, the water purification cartridge can be provided in a state where the flow path is appropriately connected in the axial direction between the head side flow path fixed to the head portion of the housing and the grip side flow path that is directly connected to the head side flow path in the grip portion or indirectly connected via the water purification cartridge and prevented from coming off by a locking member. Therefore, the water purification cartridge and the flow path member can be assembled in the grip portion of the housing in a state where the flow paths are appropriately connected.

The showerhead of the present invention may be further configured as follows: The head-side flow path and/or the grip-side flow path have a recessed fitting recess into which the water purification cartridge can be fitted in the axial direction to connect the flow path.

According to the above configuration, the water purification cartridge can be assembled in a state where it is more simply and appropriately connected to the head side flow path and/or the grip side flow path. In addition, when the grip side flow path is connected to the head side flow path directly or indirectly via the water purification cartridge, by fitting the water purification cartridge into the fitting recess, it is possible to easily assemble them with the water purification cartridge temporarily held in the fitting recess.

The showerhead of the present invention may be further configured as follows: The head-side flow path and the grip-side flow path are directly connected to each other by fitting an outer tubular portion extending from one of them in the axial direction onto the outer periphery of the other, and a water purification cartridge is provided in the connected flow path.

With the above configuration, the head side flow path and the grip side flow path are directly connected to each other, making it possible to provide a purified water flow path that passes through the water purification cartridge and another flow path that passes outside the water purification cartridge.

The showerhead of the present invention may be further configured as follows: The grip portion extends straight in the axial direction of the cylinder from the peripheral wall of the head portion at an angle in a bent shape. The outer cylinder portion is formed in the grip-side flow path.

According to the above configuration, by forming an outer tube portion on the grip-side flow path that passes through the grip portion that extends straight in the axial direction, the grip-side flow path can be smoothly passed through the grip portion even in the presence of the outer tube portion.

The showerhead of the present invention may be further configured as follows: The outer cylindrical portion has a diameter dimension that fits into the cylindrical wall of the grip portion with the gap in the cylindrical direction narrowed. With the above configuration, the outer cylindrical portion can suppress rattling of the head-side flow path and the grip-side flow path relative to the grip portion in the cylindrical direction.

The showerhead of the present invention may be further configured as follows: The grip-side flow path has a protruding portion at a portion where it does not overlap with the water purification cartridge in the axial direction of the cylinder, which fits into the cylindrical wall of the grip portion in a state where the gap in the axial direction of the cylinder is filled. The locking member engages with the protruding portion.

According to the above configuration, the protruding portion can more appropriately suppress rattling of the grip-side flow path relative to the grip portion in the tube diameter direction. In addition, since the protruding portion does not overlap with the water purification cartridge in the tube axis direction, it is possible to engage the locking member by fitting it deeper into the protruding portion from the outside in the tube diameter direction.

The showerhead of the present invention may be further configured as follows: The grip-side flow path has a terminal engagement portion that engages with the base end terminal of the grip portion in the axial direction. The terminal engagement portion has an annular terminal mating portion that projects outward from the base end terminal of the grip portion and is fitted in the axial direction along the entire circumference of the base end terminal, and a terminal fitting portion that fits into the cylindrical wall of the base end terminal of the grip portion in a state where the gap in the axial direction is filled.

With the above configuration, the terminal engagement portion of the grip-side flow path can be exposed from the terminal on the base end side of the grip portion in a shape that looks integrated with the grip portion and has a good appearance.

The showerhead of the present invention may be further configured as follows: Between the outer peripheral wall of the grip-side flow passage at the base end in the axial direction of the cylinder and the inner peripheral wall of the grip section at the base end in the axial direction of the cylinder, there is provided a concave-convex structure that fits into each other in the axial direction of the cylinder to restrict rotation of the grip-side flow passage in the axial direction of the cylinder relative to the grip section.

The above configuration allows the grip-side flow path to be assembled in a state where it is appropriately prevented from rotating relative to the grip portion.

1 is a perspective view illustrating an overall configuration of a shower head according to a first embodiment. FIG. 2 is a partial cross-sectional perspective view showing the internal structure of the shower head. FIG. 3 is a cross-sectional view corresponding to FIG. 2 . FIG. 2 is an exploded perspective view of the shower head. FIG. 5 is an exploded perspective view of FIG. 4 as seen from the opposite side. FIG. 4 is a cross-sectional view illustrating a state before internal parts are assembled into a housing. 4 is a cross-sectional view showing a state in which a head-side flow passage is assembled in a head portion of a housing. FIG. 13 is a cross-sectional view showing the state in which the water purification cartridge is fitted into the fitting recess of the grip-side flow path. FIG. 11 is a cross-sectional view showing a state in which a grip-side flow passage is connected to a head-side flow passage portion. FIG. FIG. 4 is an enlarged view of a portion X in FIG. 3 .

Below, the form for implementing the present invention is explained with reference to the drawings.

First Embodiment
(Schematic configuration of showerhead 1)
First, the configuration of a showerhead 1 according to a first embodiment of the present invention will be described with reference to Figures 1 to 10. In the following description, when directions such as front, back, top, bottom, left, and right are indicated, they refer to the respective directions shown in each figure.

The directions shown in each figure are those seen by a user standing in front of the showerhead 1. In the following explanation, if no specific reference figure is given or if there is no reference number corresponding to the reference figure, one of Figures 1 to 10 will be referenced as appropriate.

As shown in FIG. 1, the showerhead 1 according to this embodiment is configured as a water spraying device that is detachably mounted on the wall of a bathroom (not shown). The showerhead 1 is connected to a shower device installed in the bathroom via a shower hose (not shown). The showerhead 1 takes in hot water discharged from the shower device and sprays it toward the user in a wide distribution from a spray plate 30 attached to the front of the head.

The showerhead 1 comprises a resin housing 10 that serves as its exterior component, a resin flow path member 20 (see Figures 2 and 3) that is fitted inside the housing 10, and a resin disk-shaped water spray plate 30 that is attached to the head portion 11 of the housing 10. The showerhead 1 also comprises a cylindrical water purification cartridge 40 that is fitted inside the flow path member 20, and an ultra-fine bubble generator 50 that is made up of multiple disks stacked on top of each other.

As shown in FIG. 4, the housing 10 is integrally provided with a head portion 11 in the shape of a shallow cylindrical container with a circular assembly opening 11A to which the water spray plate 30 can be assembled from the front side, and a grip portion 12 that extends cylindrically from the peripheral wall of the head portion 11 downward in the figure. The grip portion 12 functions as a grip when the user holds the shower head 1 in their hand.

The grip section 12 is configured such that a vertically long extended opening 12A that connects to the assembly opening 11A of the head section 11 is formed on the front side wall of the tip side (top end side in the figure) that connects to the head section 11. The extended opening 12A is configured to be a wide vertically long opening that connects to the assembly opening 11A, so that when the head side flow passage 21 of the flow passage member 20 described later is assembled inside the housing 10, the head side flow passage 21 can be widely accommodated between the assembly opening and the extended opening 12A. When the head side flow passage 21 is assembled, a resin cap 13 that is assembled together with the head side flow passage 21 is attached to the extended opening 12A in a manner that closes the inside of the opening. This allows the extended opening 12A to be closed in a manner that looks good from the outside (see Figures 2 to 3).

As shown in Figures 2 and 3, the flow path member 20 is divided into two parts: a cylindrical head-side flow path 21 that is fixed inside the head portion 11 of the housing 10, and a cylindrical grip-side flow path 22 that is inserted into the grip portion 12 from an opening on the base end side (the lower end side in the figure) and connected to the head-side flow path 21. Specifically, the grip-side flow path 22 is inserted into the grip portion 12 and connected to the head-side flow path 21 as follows.

First, as shown in FIG. 8, the tubular portion of the water purification cartridge 40 at the lower end side (upstream side) is inserted into the grip side flow path 22 before it is inserted into the grip portion 12. Next, the grip side flow path 22 together with the water purification cartridge 40 is inserted into the grip portion 12 from the opening at the base end side and inserted into the connecting tubular portion 21A of the head side flow path 21. As a result, as shown in FIG. 9, the outer tubular portion 22B of the grip side flow path 22 is fitted onto the outer periphery of the connecting tubular portion 21A of the head side flow path 21, and the grip side flow path 22 and the head side flow path 21 are directly connected to each other.

The tubular portion at the upper end (downstream side) of the water purification cartridge 40 is fitted into the connecting tubular portion 21A of the head side flow path 21. As a result, the water purification cartridge 40 is set in a form interposed within the connecting flow path in which the head side flow path 21 and the grip side flow path 22 are directly flow-connected, and is in a state of flow path connection to the head side flow path 21 and the grip side flow path 22 in the tubular axis direction. Here, the "tubular axis direction" refers to the direction in which the tube of the grip side flow path 22 extends.

After the grip-side flow passage 22 is inserted, the clip CL is fitted into the through hole 12B formed in the rear wall of the base end side of the grip portion 12 of the housing 10, and the clip CL is engaged with the grip-side flow passage 22. As a result, as shown in FIG. 10, the grip-side flow passage 22 is fixed in a state in which its movement in the axial direction relative to the grip portion 12 is restricted and it is prevented from coming off. Here, the clip CL corresponds to the "locking member" of the present invention.

Thus, even if the flow path member 20 is divided into two parts, the head side flow path 21 and the grip side flow path 22, these can be easily assembled in a flow path connected state within the housing 10. Furthermore, the flow path member 20 is configured so that by assembling the grip side flow path 22 to the head side flow path 21, the water purification cartridge 40 can also be set in a state in which the flow path is appropriately connected between them. Furthermore, the flow path member 20 is configured so that the grip side flow path 22 can be easily removed from the connected state with the head side flow path 21 by pulling out the clip CL fitted into the grip part 12. Furthermore, the flow path member 20 is configured so that by removing the grip side flow path 22, the water purification cartridge 40 fitted into the grip side flow path 22 can also be easily removed from the grip part 12.

(Configuration of each part of showerhead 1)
Below, we will explain in detail the specific configuration of each part of the showerhead 1. As shown in Figures 4 and 5, in addition to the above-mentioned housing 10, flow path member 20, spray plate 30, water purification cartridge 40, and ultra-fine bubble generator 50, the showerhead 1 further comprises a resin elbow 60, a resin switching shaft 70, and a resin switching body 80.

(Housing 10)
The housing 10 includes the head portion 11 having the shallow cylindrical container shape described above, and a cylindrical grip portion 12 extending downward in the figure from the peripheral wall on the lower end side in the figure of the head portion 11. The housing 10 also includes a curved plate-like cap 13 attached to close an extended opening 12A formed in the grip portion 12.

As shown in FIG. 4, the head portion 11 is in the shape of a cylindrical container with an assembly opening 11A that opens in a perfect circle toward the front side of the figure. The grip portion 12 is in the shape of a cylinder that extends straight from the head portion 11 at an angle in a bent shape so that it extends diagonally from the peripheral wall of the lower end side of the head portion 11 toward the front and downward in the figure. The grip portion 12 is in the shape of a cylindrical body that extends in the axial direction of the cylinder with a constant wall thickness. The grip portion 12 is in the shape of a through hole in the axial direction so that its inside is connected to the inside of the container of the head portion 11.

The extension opening 12A formed in the grip portion 12 is formed across the wall area that extends in the left-right direction from the peripheral wall on the base side that connects to the grip portion 12 of the head portion 11. As a result, in addition to being a wide vertical opening that connects to the assembly opening 11A, the extension opening 12A is formed so that the portion facing the assembly opening 11A forms a wide receiving port, making it easy to incorporate the head-side flow path 21 inside.

The cap 13 is formed in a curved plate shape that matches the shape of the extension opening 12A. As shown in Figures 6 to 7, the cap 13 is fastened to the head-side flow passage 21 with a set screw S1 (see Figure 5) to form a unit, and is configured to be assembled to the housing 10 together with the head-side flow passage 21.

Specifically, as the head-side flow passage 21 is assembled into the head portion 11 of the housing 10, the claw 13B formed on the edge of the lower end side in the figure is hooked from the inner periphery to the edge facing the extended opening 12A of the grip portion 12, and the cap 13 is set in a shape that covers the extended opening 12A. Then, the cap 13 is held in a state in which it is fixed integrally to the housing 10 via the head-side flow passage 21, as the head-side flow passage 21 is fixed into the head portion 11 via an elbow 60 described below. The cap 13 is set in a shape that completely blocks the extended opening 12A, and is provided in a shape that smoothly connects without any steps to the cylindrical wall of the adjacent grip portion 12 and the peripheral wall of the head portion 11.

(Flow Channel Member 20)
2 and 3, the flow path member 20 includes a cylindrical head-side flow path 21 that is set in the head portion 11 of the housing 10 described above, and a cylindrical grip-side flow path 22 that is inserted into the grip portion 12 from an opening on the base end side and connected to the head-side flow path 21. The head-side flow path 21 includes a cylindrical connecting tube portion 21B that is connected to an elbow 60 described below and is fixed in the head portion 11, and a cylindrical connecting tube portion 21A that extends from the connecting tube portion 21B into the grip portion 12 in a bent shape.

The head-side flow path 21 is configured with an insertion recess 21C that allows the tubular portion of the water purification cartridge 40 at the upper end side (downstream side) shown in the figure to be inserted from below in the axial direction of the tube into the connecting tube portion 21A that extends into the grip portion 12 to connect the flow path. The insertion recess 21C is configured as a cylindrical concave surface with an inner diameter that is slightly larger than the outer diameter of the tube wall portion of the water purification cartridge 40, and allows the water purification cartridge 40 to be set with a gap in the axial direction of the tube.

The water purification cartridge 40 is configured such that a thick-diameter portion 41 is formed on the outer periphery of the middle portion that is fitted into the connecting tube portion 21A of the head side flow path 21, and the thick-diameter portion 41 is expanded in a partially annular shape. The thick-diameter portion 41 functions as a gap-filling portion that fills the gap between the connecting tube portion 21A of the head side flow path 21 and the thick-diameter portion 41 in the tube diameter direction. By filling the gap between the thick-diameter portion 41 and the connecting tube portion 21A, the thick-diameter portion 41 suppresses the flow rate of hot water that flows from the grip side flow path 22 to the head side flow path 21 through the outside of the water purification cartridge 40 without passing through the inside. Therefore, by adjusting the gap between the thick-diameter portion 41 and the connecting tube portion 21A, the flow rate of hot water that flows through the outside of the water purification cartridge 40 can be appropriately adjusted.

A circular step portion 21D that narrows the diameter of the cylinder in a step-like manner around the entire circumference is formed on the periphery of the fitting recess 21C of the head side flow path 21, which is recessed in the axial direction. The fitting recess 21C is configured to hold the water purification cartridge 40 in a centered position on the central axis inside the cylinder by fitting the tip portion of the water purification cartridge 40 in the axial direction into the reduced diameter portion surrounded by the step portion 21D. The step portion 21D has an inner diameter that gently fits the tip portion of the water purification cartridge 40 in the axial direction. Therefore, when the grip side flow path 22 is pulled out of the grip portion 12 in the gravitational direction, the water purification cartridge 40 is pulled out together with the grip side flow path 22 to the outside without being held by the step portion 21D.

The head-side flow passage 21 is set in the head portion 11 of the housing 10 by the following procedure. First, the cap 13 is attached integrally to the head-side flow passage 21. Specifically, as shown in FIG. 5, each of the cylindrical female thread tubes 13A protruding from each corresponding position on the inner peripheral surface of the cap 13 is abutted from the front side against each of the fin portions 21E protruding from the left and right side walls of the connecting tube portion 21B of the head-side flow passage 21. Then, a set screw S1 is inserted from each of the fin portions 21E side to integrally fasten each of the female thread tubes 13A. This allows the cap 13 to be attached integrally to the head-side flow passage 21.

In addition to attaching the cap 13, the multiple disks constituting the ultra-fine bubble generator 50 are set in a state where they are stacked in the cylindrical axis direction inside the connecting tube portion 21B of the head side flow path 21. Furthermore, the connecting tube portion 61 of the elbow 60 is inserted into the connecting tube portion 21B of the head side flow path 21 to connect the flow paths. As a result, as shown in FIG. 6, each disk constituting the ultra-fine bubble generator 50 is set in a state where it is stacked in the cylindrical axis direction inside the connecting tube portion 21B of the head side flow path 21 by attaching the elbow 60. Furthermore, the head side flow path 21, the cap 13, and the elbow 60 are assembled into an integrated unit.

After the above assembly, the connecting tube portion 21A of the head-side flow passage 21 is inserted into the grip portion 12 from the elongated opening consisting of the assembly opening 11A and the extension opening 12A of the housing 10, and the claw 13B of the cap 13 is hooked onto the edge facing the extension opening 12A of the grip portion 12. Then, together with the above assembly, the elbow 60 is inserted into the head portion 11 from the assembly opening 11A of the housing 10, and the cylindrical fitting protrusion 63 protruding from the inner wall of the bent portion of the elbow 60 is fitted into the cylindrical fitting tube 11B protruding from the center of the bottom plate of the cylindrical container of the head portion 11.

As a result, as shown in FIG. 7, the head-side flow passage 21, the cap 13, and the elbow 60 are held in a state where they are integrally assembled to the housing 10. With the above assembly, the head-side flow passage 21 has its downstream connecting tube portion 21B fixed inside the head portion 11 via the elbow 60. Also, the head-side flow passage 21 is held in a centered state in which its upstream connecting tube portion 21A enters the cylindrical interior of the grip portion 12 and extends straight in the cylindrical axial direction inside the grip portion 12 along a position on the central axis inside the cylindrical interior.

As shown in Figures 2 and 3, the grip-side flow path 22 includes a cylindrical connecting tube portion 22A that is connected to the connecting tube portion 21A of the head-side flow path 21 inside the grip portion 12 of the housing 10, and an outer tube portion 22B that is a size larger than the connecting tube portion 22A and extends concentrically in the tube axis direction from the tip (upper end shown) of the connecting tube portion 22A. The connecting tube portion 22A is cylindrical with approximately the same outer and inner diameters as the connecting tube portion 21A of the head-side flow path 21.

As shown in FIG. 8, the grip-side flow passage 22 is inserted into the tubular interior of the grip section 12 from the tip side where the outer tube portion 22B is formed, and the connecting tube portion 21A of the head-side flow passage 21 is fitted into the tubular interior of the outer tube portion 22B. By the above insertion, the grip-side flow passage 22 is connected in a state where the outer tube portion 22B is in close contact with the connecting tube portion 21A of the head-side flow passage 21 around the entire circumference via an O-ring (not shown) attached to the outer periphery of the connecting tube portion 21A of the head-side flow passage 21. As a result, the connecting tube portion 22A of the grip-side flow passage 22 and the connecting tube portion 21A of the head-side flow passage 21 are connected to each other in the axial direction.

The outer tube portion 22B has an outer diameter that allows it to be inserted into the inside of the grip portion 12 and fit into the grip portion 12 without creating any gap in the tube diameter direction. Therefore, by fitting the outer tube portion 22B of the grip side flow path 22 into the connecting tube portion 21A of the head side flow path 21, both the outer tube portion 22B and the connecting tube portion 21A of the head side flow path 21 are in a state where rattling in the tube diameter direction relative to the grip portion 12 is suppressed.

The grip-side flow path 22 is configured with an insertion recess 22C inside the connecting tube portion 22A, into which the tube portion of the water purification cartridge 40 at the lower end side (upstream side) shown in the figure can be inserted from above in the axial direction of the tube to connect the flow path. The insertion recess 22C is configured as a cylindrical concave surface with an inner diameter slightly larger than the outer diameter of the tube wall portion of the water purification cartridge 40, and is configured so that the water purification cartridge 40 can be set with a gap in the tube diameter direction.

The water purification cartridge 40 is configured such that base end protrusions 42 of the same shape that protrude upright are formed at four positions in the circumferential direction on the outer periphery of the base end (lower end in the figure). The water purification cartridge 40 is also configured such that intermediate protrusions 43 of the same shape that protrude hemispherically are formed at four positions in the circumferential direction on the outer periphery of the middle part that is fitted into the connecting tubular part 22A of the grip-side flow path 22.

When the water purification cartridge 40 is fitted into the connecting tube portion 22A of the grip-side flow path 22, these base end protrusions 42 and intermediate protrusions 43 are fitted in a state in which there is almost no gap in the tube diameter direction relative to the connecting tube portion 22A. Therefore, by fitting the water purification cartridge 40 into the connecting tube portion 22A of the grip-side flow path 22, the water purification cartridge 40 can be set in a centered position relative to the connecting tube portion 22A of the grip-side flow path 22 without any rattling in the tube diameter direction.

A circular stepped portion 22D that narrows the diameter of the cylinder in a stepped manner around the entire circumference is formed on the periphery of the fitting recess 22C of the grip side flow path 22, which is recessed in the axial direction of the cylinder. When the water purification cartridge 40 is inserted into the connecting cylinder portion 22A of the grip side flow path 22, the stepped portion 22D abuts against each base end protrusion 42 of the water purification cartridge 40 in the axial direction, and functions as a restricting portion that restricts the insertion position of the water purification cartridge 40.

As shown in FIG. 9, the grip-side flow path 22 is configured such that a protruding portion 22F that protrudes in an annular shape and expands in diameter is formed on a base portion 22E that is fitted into the inside of the tube at the base end (lower end in the figure) of the grip portion 12. The base portion 22E on which the protruding portion 22F is formed is formed at a position spaced apart in the axial direction (downward in the figure) from the fitting recess 22C into which the water purification cartridge 40 is fitted. Therefore, the base portion 22E is a portion that does not overlap with the water purification cartridge 40 in the axial direction.

The protruding portion 22F protruding from the base portion 22E is annular and has the same outer diameter as the outer tube portion 22B. Therefore, by inserting the protruding portion 22F into the cylindrical interior of the grip portion 12, it is fitted to the grip portion 12 in a state where there is almost no gap in the cylindrical diameter direction, and is set in a state where rattling in the cylindrical diameter direction is suppressed relative to the grip portion 12. A locking groove 22G that is recessed in an annular shape around the entire circumference is formed in the middle part of the protruding portion 22F in the cylindrical axis direction.

When the grip-side flow passage 22 is inserted into the tubular interior of the grip portion 12, the locking groove 22G is set in a state where it overlaps with the through hole 12B formed in the rear wall of the grip portion 12 in the axial direction. The locking groove 22G has a groove width in the axial direction that is approximately the same shape as the hole width in the axial direction of the through hole 12B. After the grip-side flow passage 22 is inserted, the locking groove 22G is set in a state where the clip CL made of resin is inserted into the through hole 12B from the outside, with the clip CL fitted inside the groove (see FIG. 10). This restricts the grip-side flow passage 22 from moving in the axial direction relative to the grip portion 12 and prevents it from coming loose.

As shown in Figures 4 and 5, the clip CL has an open ring-shaped groove fitting portion CL1 that fits into the locking groove 22G, and a plate-shaped hole fitting portion CL2 that fits into the through hole 12B of the grip portion 12. After the grip-side flow path 22 is inserted into the grip portion 12, the clip CL is inserted into the through hole 12B of the grip portion 12 from the outside, so that the groove fitting portion CL1 elastically fits inside the locking groove 22G and is snap-fitted to prevent it from coming out. Specifically, the open ring-shaped groove fitting portion CL1 elastically fits inside the locking groove 22G in a shape that sandwiches the cylindrical wall of the grip-side flow path 22 in the left-right direction.

Then, together with the above fitting, the hole fitting portion CL2 fits into the through hole 12B of the grip portion 12 so as to close the through hole 12B, and is set in a state in which the outer surface is flush with the outer peripheral surface of the grip portion 12. The groove fitting portion CL1 is shaped to have a thickness in the axial direction that allows it to fit into the locking groove 22G in a state in which there is almost no gap in the axial direction.

The hole fitting portion CL2 is shaped to have a thickness in the axial direction and a width that fit into the through hole 12B with almost no gap in the axial direction and lateral direction, respectively. Therefore, by fitting the groove fitting portion CL1 and the hole fitting portion CL2 of the clip CL into the locking groove 22G and the through hole 12B, respectively, the movement of the grip-side flow path 22 in the axial direction relative to the grip portion 12 is appropriately restricted via the clip CL that is attached across the two (see FIG. 10).

10, the grip-side flow passage 22 further includes a terminal engagement portion 22H that extends downward (in the axial direction) from the base portion 22E. The terminal engagement portion 22H is a portion that is engaged in an exposed state by being abutted against the terminal on the base end side (lower end side in the figure) of the grip portion 12 in the axial direction when the grip-side flow passage 22 is inserted into the tubular interior of the grip portion 12.

Specifically, the terminal engagement portion 22H has a terminal mating portion H1 that protrudes in an annular shape with an expanded diameter, and a terminal fitting portion H2 that is annular and has a stepped shape with a reduced diameter along the upper edge of the terminal mating portion H1. The terminal mating portion H1 is formed in an annular shape with an outer diameter that is slightly smaller than but approximately the same as the outer diameter of the cylindrical wall of the grip portion 12.

When the grip-side flow path 22 is inserted into the grip portion 12, the terminal fitting portion H1 abuts against the terminal on the base end side (lower end side in the figure) of the grip portion 12 in the axial direction. This abutment causes the terminal fitting portion H1 to restrict the movement of the grip-side flow path 22 in the axial direction relative to the grip portion 12. When the grip-side flow path 22 is inserted into the cylindrical interior of the grip portion 12 to a position where the locking groove 22G and the through hole 12B are aligned in the axial direction (position fixed by the clip CL), the terminal fitting portion H1 is set in a state where there is almost no gap in the axial direction relative to the terminal on the base end side of the grip portion 12.

When the grip-side flow path 22 is inserted into the grip portion 12, the terminal fitting portion H2 is fitted into the terminal recess 12C, whose inner circumferential surface is enlarged in an annular shape, and is formed inside the tube at the base end side (lower end side in the figure) of the grip portion 12. The terminal recess 12C has an inner circumferential surface that is enlarged in diameter more than the inner diameter of the other inner circumferential surfaces of the grip portion 12. The terminal fitting portion H2 has an outer diameter that fits into the terminal recess 12C in a state where there is almost no gap in the tube diameter direction. Therefore, when the terminal fitting portion H2 is fitted into the terminal recess 12C, the terminal engagement portion 22H is set in a state where rattling in the tube diameter direction is suppressed relative to the grip portion 12.

As shown in FIG. 4, the terminal engagement portion 22H has terminal projections H3 that project from two opposing positions in the circumferential direction of the tube on the upper surface of the terminal mating portion H1. Each terminal projection H3 is composed of a pair of protruding plates spaced apart in the circumferential direction of the tube. When the grip-side flow path 22 is inserted into the grip portion 12, each terminal projection H3 engages with a corresponding locking projection 12D (see FIG. 5) that is formed to project from a corresponding position inside the tube on the base end side (lower end side in the figure) of the grip portion 12.

Specifically, each terminal projection H3 fits into each locking projection 12D formed inside the tube on the base end side of the grip portion 12 between the respective protruding plates. This restricts the terminal engagement portion 22H from rotating in the circumferential direction relative to the grip portion 12. Therefore, by carrying out the above series of assembly, the grip-side flow path 22 is fixed in a state in which it does not move in either the axial direction or the circumferential direction (rotational direction) relative to the grip portion 12. Here, the uneven fitting structure formed by each terminal projection H3 and each locking projection 12D corresponds to the "uneven structure" of the present invention.

As shown in FIG. 10, the grip-side flow path 22 further includes a male threaded tube 22J extending in the axial direction from the illustrated lower end of the terminal engagement portion 22H. An end of a shower hose extending from a shower device (not shown) is screwed into the male threaded tube 22J to connect the flow path.

(Water purification cartridge 40)
The water purification cartridge 40 is made of a cylindrical member filled with granular calcium sulfite as a filter medium. As shown in Figures 2 and 3, the water purification cartridge 40 is assembled into the flow path member 20 by the above-mentioned procedure, and takes in a portion of the hot and cold water flowing from the grip-side flow path 22 to the head-side flow path 21 into the cartridge from the base end side (the lower end side in the figure) in the cylindrical axis direction.

As a result, the water purification cartridge 40 dissolves minute amounts of calcium sulfite into the hot water taken in, and removes residual chlorine contained in the hot water by reacting with the sulfite ions. Calcium sulfite has the characteristic of being able to properly purify the hot water while maintaining the flow rate of the hot water flowing inside, as it reacts quickly with residual chlorine.

The water purification cartridge 40 is designed so that a portion of the hot water flowing inside it leaks out through the tube walls to the outside of the tube. As a result, the hot water that flows from the grip side flow path 22 through the gap between the tube walls to the head side flow path 21 without passing through the inside of the water purification cartridge 40 is mixed with the hot water in which calcium sulfite has dissolved and leaked from inside the water purification cartridge 40, and the hot water that does not pass through the water purification cartridge 40 is also properly purified.

(Ultra-fine bubble generator 50)
The ultra-fine bubble generator 50 is composed of a cylindrical laminated member in which circular disks, each having a plurality of blade surfaces radially extending inside, are stacked in an axial direction. The ultra-fine bubble generator 50 is set in a state where they are stacked in the axial direction inside the connecting cylindrical portion 21B of the head-side flow path 21. In this way, the ultra-fine bubble generator 50 takes in hot water flowing from the head-side flow path 21 through the narrow gaps between the blade surfaces of each disk, and causes the hot water to collide with each blade surface while increasing the flow rate of the hot water.

Then, the ultra-fine bubble generator 50 varies the water pressure of the hot water to generate air bubbles inside. Furthermore, the ultra-fine bubble generator 50 causes the hot water to collide with the blade surface, shearing the air bubbles and generating air bubbles smaller than 1 μm inside the hot water. Note that the ultra-fine bubble generator 50 has the same configuration as the publicly known configuration disclosed in JP 2020-171914 A, so a detailed description of the configuration will be omitted.

(Other components)
2 and 3, the elbow 60 is made of a resin tubular member molded into an L-shape. The elbow 60 is connected to the flow path by inserting the connection tube portion 21B of the head-side flow path 21 into one of the cylindrical connection tube portions 61 of the elbow 60. As described above in FIG. 7, the elbow 60 is assembled to the center of the bottom plate of the head portion 11 by fitting the cylindrical fitting protrusion 63 protruding from the inner wall of the bent portion into the cylindrical fitting tube 11B protruding from the center of the bottom plate of the cylindrical container of the head portion 11. With the above assembly, the elbow 60 is set in a state in which the other cylindrical connection tube portion 62 is oriented straight toward the front side in the figure, which is the opening direction of the head portion 11, at the center of the head portion 11.

As shown in Figures 2 and 3, the switching shaft 70 comprises a cylindrical main shaft 71 and a shaft fixing plate 72 that extends in a disk-like shape in the radial direction from the main shaft 71 as the center. A separate outer peripheral ring 73 is attached to the outer periphery of the switching shaft 70, and is fitted along the outer periphery in a cylindrical protruding shape from the outer periphery. As shown in Figure 7, the switching shaft 70 is assembled into the head portion 11 through the assembly opening 11A of the head portion 11 after the elbow 60 is set in the head portion 11.

Specifically, the switching shaft 70 is assembled into the head portion 11 as follows. First, the tube portion at the rear side in the figure of the main shaft 71 is fitted into the outer periphery of the connecting tube portion 62 of the elbow 60. Then, at the same time as this fitting, the shaft fixing plate 72 is abutted from the front side in the figure against each of the cylindrical female threaded tubes 11C that protrude from four positions on the bottom plate of the head portion 11. Each female threaded tube 11C protrudes from four positions in the circumferential direction on the bottom plate portion around the fitting tube 11B of the head portion 11 (see Figure 4).

After the above assembly, set screws S2 are inserted from the front side of the figure into each position of the shaft fixing plate 72 to which each female threaded tube 11C is attached, and the shaft fixing plate 72 is fastened integrally to each female threaded tube 11C. As a result, as shown in FIG. 8, the switching shaft body 70 is attached integrally to the inside of the head portion 11. This fastening causes the elbow 60 to be pressed against the head portion 11 by the main shaft 71 of the switching shaft body 70 and fixed integrally to the head portion 11. The switching shaft body 70 is configured such that a part of its shaft fixing plate 72 is abutted from the front side of the figure against the connecting tube portion 21B of the head side flow path 21 assembled to the elbow 60, supporting the connecting tube portion 21B of the head side flow path 21 from the front side of the figure.

As shown in Figures 2 and 3, the switching body 80 comprises a cylindrical body shaft 81, a body plate 82 that extends in a radial direction from the body shaft 81 in a disk-like shape, and a male threaded tube 83 that extends in a cylindrical shape from the outer periphery of the body plate 82 toward the front side in the figure. After the switching shaft 70 described above is assembled inside the head part 11, the switching body 80 is assembled from the front side in the figure so as to cover the assembly opening 11A of the head part 11.

Specifically, the switching body 80 is assembled in the head portion 11 as follows. First, the cylindrical portion at the rear side of the body shaft 81 is fitted onto the outer periphery of the cylindrical portion at the front side of the body shaft 71 of the switching shaft body 70. Then, a set screw S3 is inserted into a seat portion formed in the center of the cylinder of the body shaft 81 from the front side in the figure, and the set screw S3 is fastened integrally to the end portion at the front side in the figure of the body shaft 71 of the switching shaft body 70. As a result, the switching body 80 is attached integrally to the head portion 11 via the switching shaft body 70, as shown in FIG. 8.

As shown in Figures 2 and 3, the water sprinkler plate 30 comprises a disk-shaped plate body 31, a female threaded tube 32 that extends cylindrically from the outer periphery of the plate body 31 toward the rear side in the figure, and a knob 33 that protrudes from the outer periphery of the cylindrical wall of the female threaded tube 32. After the switching body 80 described above is assembled to the head portion 11, the water sprinkler plate 30 is assembled to the switching body 80 from the front side in the figure.

Specifically, the sprinkler plate 30 is assembled to the switching body 80 as follows. First, the female threaded tube 32 of the sprinkler plate 30 is set to match the outer periphery of the male threaded tube 83 of the switching body 80, and the female threaded surface of the female threaded tube 32 is turned so as to screw into the male threaded surface of the male threaded tube 83. As a result, as shown in FIG. 8, the female threaded tube 32 of the sprinkler plate 30 is butted against the tip of the cylindrical wall of the cylindrical container of the head part 11, with the end of the outer ring 73 sandwiched between them. As a result, the sprinkler plate 30 is set relative to the head part 11 in a way that it encases the switching body 80 inside.

Assembled as described above, the sprinkler plate 30 forms a sprinkler flow path between its plate body 31 and the main plate 82 of the switching body 80, through which hot and cold water flowing from the flow path member 20 flows. When hot and cold water flows into the sprinkler flow path, the sprinkler plate 30 disperses and sprays the hot and cold water to the outside from the numerous sprinkler holes 31A formed through the plate body 31.

The knob 33 is configured as an operating part that allows the user to hook his/her finger on it to rotate the sprinkler plate 30. When the user hooks his/her finger on the knob 33 and rotates it in the rotational direction, the internal switching body 80 rotates accordingly, and the form of hot water sprayed from the sprinkler plate 30 is switched between mist-like spray and shower-like spray.

In summary, the shower head 1 according to the first embodiment has the following configuration. Note that the reference characters in parentheses below correspond to the respective components shown in the above embodiment.

That is, the shower head (1) comprises a housing (10) including a head portion (11) that serves as a spray portion, and a grip portion (12) that extends cylindrically from the peripheral wall of the head portion (11), and a cylindrical flow path member (20) that is incorporated inside the housing (10) and forms a flow path for hot and cold water. The flow path member (20) has a head-side flow path (21) that is fixed inside the head portion (11) and extends into the grip portion (12), and a grip-side flow path (22) that is directly or indirectly connected to the head-side flow path (21) from the base end side in the cylindrical axis direction inside the grip portion (12).

The shower head (1) further includes a water purification cartridge (40) that is set in a state where the head-side flow path (21) and the grip-side flow path (22) are connected in the axial direction of the cylinder, and a locking member (CL) that is fitted from the outside in the axial direction of the cylinder into a through hole (12B) formed in the cylindrical wall of the grip portion (12) and engages with the grip-side flow path (22) in a state that restricts movement in the axial direction of the cylinder relative to the grip portion (12).

According to the above configuration, the water purification cartridge (40) can be provided in a state where the head side flow path (21) fixed to the head portion (11) of the housing (10) and the grip side flow path (22) that is flow-path connected to the head side flow path (21) in the grip portion (12) directly or indirectly via the water purification cartridge (40) and is prevented from coming off by the locking member (CL) in a state where the water purification cartridge (40) is appropriately connected to the flow path in the cylindrical axis direction. Therefore, the water purification cartridge (40) and the flow path member (20) can be assembled in the grip portion (12) of the housing (10) in a state where the water purification cartridge (40) and the flow path member (20) are appropriately connected to each other.

The head side flow path (21) and/or the grip side flow path (22) have a recessed fitting recess (21C, 22C) into which the water purification cartridge (40) can be fitted in the axial direction to connect the flow path.

According to the above configuration, the water purification cartridge (40) can be assembled in a state where it is more simply and appropriately connected to the head side flow path (21) and/or the grip side flow path (22). In addition, when the grip side flow path (22) is connected to the head side flow path (21) directly or indirectly via the water purification cartridge (40), the water purification cartridge (40) can be fitted into the fitting recesses (21C, 22C) to easily assemble them in a state where the water purification cartridge (40) is temporarily held in the fitting recesses (21C, 22C).

The head-side flow path (21) and the grip-side flow path (22) are directly connected to each other by fitting an outer tube portion (22B) extending from one of them in the axial direction onto the outer periphery of the other, and a water purification cartridge (40) is provided in the connected flow path.

With the above configuration, the head side flow path (21) and the grip side flow path (22) are directly connected to each other, making it possible to provide a purified water flow path that passes through the water purification cartridge (40) and another flow path that passes outside the water purification cartridge (40) between them.

The grip portion (12) extends straight in the axial direction of the cylinder, bending at an angle from the peripheral wall of the head portion (11). An outer tube portion (22B) is formed in the grip-side flow path (22). According to the above configuration, by forming the outer tube portion (22B) in the grip-side flow path (22) that passes through the grip portion (12) that extends straight in the axial direction of the cylinder, the grip-side flow path (22) can be smoothly passed through the grip portion (12) even with the outer tube portion (22B).

The outer tube portion (22B) has a diameter dimension that fits into the tube wall of the grip portion (12) with the gap in the tube diameter direction narrowed. With the above configuration, the outer tube portion (22B) can suppress rattling of the head side flow path (21) and the grip side flow path (22) relative to the grip portion (12) in the tube diameter direction.

The grip-side flow path (22) has a protruding portion (22F) that fits into the cylindrical wall of the grip portion (12) in a position where it does not overlap with the water purification cartridge (40) in the axial direction of the cylinder, filling the gap in the radial direction of the cylinder. The locking member (CL) engages with the protruding portion (22F).

According to the above configuration, the protrusion (22F) can more appropriately suppress rattling of the grip-side flow path (22) relative to the grip portion (12) in the tube diameter direction. In addition, since the protrusion (22F) does not overlap with the water purification cartridge (40) in the tube axis direction, it is possible to engage the locking member (CL) by fitting it more deeply into the protrusion (22F) from the outside in the tube diameter direction.

The grip-side flow path (22) also has a terminal engagement portion (22H) that engages with the terminal on the base end side of the grip portion (12) in the tubular axis direction. The terminal engagement portion (22H) has an annular terminal mating portion (H1) that protrudes outward from the terminal on the base end side of the grip portion (12) and is fitted in the tubular axis direction along the entire circumference of the terminal on the base end side, and a terminal fitting portion (H2) that fits into the tubular wall of the terminal on the base end side of the grip portion (12) in a state where the gap in the tubular diameter direction is filled.

According to the above configuration, the terminal engagement portion (22H) of the grip-side flow path (22) can be exposed from the terminal on the base end side of the grip portion (12) in a shape that looks good and is integrated with the grip portion (12).

In addition, a concave-convex structure (H3, 12D) is provided between the outer peripheral wall of the grip side flow passage (22) at the base end in the axial direction of the cylinder and the inner peripheral wall of the grip portion (12) at the base end in the axial direction of the cylinder, which fits into each other in the axial direction of the cylinder to restrict the rotation of the grip side flow passage (22) in the axial direction of the cylinder relative to the grip portion (12).

The above configuration allows the grip-side flow path (22) to be assembled in a state where it is appropriately prevented from rotating relative to the grip portion (12).

Other embodiments
Although one embodiment of the present invention has been described above, the present invention can be embodied in various forms as described below in addition to the above embodiment.

1. The showerhead of the present invention may be configured as a so-called handheld showerhead that is held by the user in the hand, or as a so-called overhead showerhead that is fixed to the wall or ceiling of the bathroom and sprays shower water onto the user from above.

2. The grip portion of the housing may extend straight from the peripheral wall of the head portion in the axial direction at an angle in a bent shape, or may extend straight from the peripheral wall of the head portion. The grip portion may be cylindrical, angular, or irregularly shaped. The grip portion may be configured to be fitted in a state where the grip-side flow path is prevented from rotating by being formed in a cylindrical shape other than a cylindrical shape.

3. The head-side flow path and the grip-side flow path that constitute the flow path member may be cylindrical, square, or irregularly shaped. The grip-side flow path may be directly connected to the head-side flow path and have a water purification cartridge installed inside, or may be indirectly connected to the head-side flow path via a water purification cartridge. In that case, the water purification cartridge is individually connected to the grip-side flow path and the head-side flow path, and hot and cold water flowing from the grip-side flow path passes through its interior and flows to the head-side flow path.

4. The water purification cartridge may be configured to use calcium sulfite as a filter material, or may use an activated carbon filter and/or a hollow fiber membrane filter as a filter material. Or, it may be configured to use a combination of these.

5. The locking member that prevents the grip-side flow path from coming loose from the grip portion may be a clip, a pin, or a screw. The locking member may be configured to engage with a portion of the grip-side flow path that does not have a protruding portion, i.e., a portion that is disposed with a gap in the cylindrical diameter direction between the grip portion and the cylindrical wall. The locking member may be configured to stop the rotation of the grip-side flow path relative to the grip portion by engaging with the grip-side flow path. The locking member may be configured to engage with a portion of the grip-side flow path where the water purification cartridge and the grip-side flow path overlap in the cylindrical axis direction.

6. In the above embodiment, a configuration was exemplified in which a concave fitting recess was formed in both the head side flow path and the grip side flow path, into which the water purification cartridge could be fitted in the axial direction to connect the flow path, but the fitting recess may be formed only on one side or on neither side. In other words, even if a fitting recess is not formed, it is possible to adopt a configuration in which the head side flow path and/or the grip side flow path can be abutted against the water purification cartridge in the axial direction to connect the flow path, or the entire water purification cartridge can be accommodated in a fitting recess formed on one side, and the grip side flow path can be directly connected to the head side flow path to set the water purification cartridge in a state of flow path connection between the grip side flow path and the head side flow path in the axial direction.

7. In the above embodiment, a configuration was exemplified in which an outer tube portion that fits onto the outer periphery of the head-side flow path was formed on the grip-side flow path, but a configuration in which an outer tube portion is formed on the head-side flow path and fits onto the outer periphery of the grip-side flow path may also be used.

8. The concave-convex structure formed between the outer peripheral wall of the grip-side flow passage at the base end in the axial direction and the inner peripheral wall of the grip section at the base end in the axial direction, which fits into each other in the axial direction to regulate rotation, may be configured so that the concave and convex parts are formed separately on either side.

REFERENCE SIGNS LIST 1 shower head 10 housing 11 head portion 11A assembly opening 11B fitting cylinder 11C female thread cylinder 12 grip portion 12A extension opening 12B through hole 12C terminal recess 12D locking projection (concave-convex structure)
13 Cap 13A Female threaded tube 13B Claw 20 Flow path member 21 Head side flow path 21A Connection tube portion 21B Connection tube portion 21C Fitting recess 21D Step portion 21E Fin portion 22 Grip side flow path 22A Connection tube portion 22B Outer tube portion 22C Fitting recess 22D Step portion 22E Base portion 22F Projection portion 22G Locking groove 22H Terminal engagement portion 22J Male threaded tube H1 Terminal mating portion H2 Terminal fitting portion H3 Terminal protrusion (concave-convex structure)
30 Sprinkler plate 31 Plate body 31A Sprinkler hole 32 Female thread tube 33 Knob 40 Water purification cartridge 41 Large diameter portion 42 Base end projection 43 Intermediate projection 50 Ultra-fine bubble generator 60 Elbow 61 Connecting tube portion 62 Connecting tube portion 63 Fitting projection 70 Switching shaft body 71 Main body shaft 72 Shaft fixing plate 73 Outer circumferential ring 80 Switching body 81 Main body shaft 82 Main body plate 83 Male thread tube CL Clip (locking member)
CL1 Groove fitting part CL2 Hole fitting part S1 Set screw S2 Set screw S3 Set screw

Claims (7)

A shower head comprising a housing having a head portion which serves as a spray portion and a grip portion which extends cylindrically from the peripheral wall of the head portion, and a cylindrical flow path member which is incorporated inside the housing and forms a flow path for hot and cold water,
the flow path member has a head-side flow path fixed in the head portion and extending into the grip portion, and a grip-side flow path that is directly or indirectly connected to the head-side flow path in the grip portion from a base end side in a cylindrical axis direction,
the showerhead further comprises a water purification cartridge that is set in a state in which the head-side flow path and the grip-side flow path are connected in a flow path in the axial direction of the cylinder, and a locking member that is fitted from the outside in the axial direction of the cylinder into a through hole formed in a cylindrical wall of the grip portion and engages with the grip-side flow path in a state that restricts movement in the axial direction relative to the grip portion,
The grip-side flow path has a protruding portion that fits into the cylindrical wall of the grip portion in a state where a gap in the cylindrical diameter direction is filled, at a portion where the grip-side flow path does not overlap with the water purification cartridge in the cylindrical axial direction,
The shower head , wherein the locking member engages with the protruding portion . 2. The showerhead of claim 1,
A showerhead, wherein the head-side flow path and/or the grip-side flow path has a concave fitting recess into which the water purification cartridge can be fitted in the axial direction to connect the flow path. 3. The showerhead according to claim 1,
A showerhead in which the head-side flow path and the grip-side flow path are directly connected to each other by fitting an outer tubular portion extending from one of them in the axial direction into the outer periphery of the other, and the water purification cartridge is provided within the connected flow path. 4. The showerhead of claim 3,
The grip portion extends straight in the axial direction of the cylinder from a peripheral wall of the head portion at an angle in a bent shape, and the outer cylinder portion is formed in the grip-side flow path. 5. The showerhead according to claim 3 or 4,
The showerhead has a diameter dimension such that the outer cylindrical portion fits into the cylindrical wall of the grip portion with a radial gap filled therewith. 6. The showerhead according to claim 1,
the grip-side flow path has a terminal engagement portion that engages with a terminal on the base end side in the cylindrical axis direction of the grip portion, the terminal engagement portion having an annular terminal mating portion that protrudes outward from the base end terminal of the grip portion and is brought into contact with the entire circumference along the base end terminal in the cylindrical axis direction, and an terminal fitting portion that fits into the cylindrical wall of the base end terminal of the grip portion in a state where any gaps in the cylindrical diameter direction are filled . 7. The showerhead according to claim 1,
The showerhead has an uneven structure between an outer peripheral wall of the grip-side flow passage at the base end in the axial direction of the cylinder and an inner peripheral wall of the grip portion at the base end in the axial direction of the cylinder, the uneven structure fitting together in the axial direction of the cylinder to restrict rotation of the grip-side flow passage in the circumferential direction of the cylinder relative to the grip portion .

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