Packing

Abstract

To provide a packing capable of suppressing a risk of generation of torsion when being attached.SOLUTION: A packing (10) which is used by being sandwiched between a first member (8) and a second member (2) includes: an annular base part (10a) disposed so as to surround a cylindrical part (8b) of the first member; a plurality of first annular wall parts (10b) projecting from one surface of the base part to the first member; and a plurality of second annular wall parts (10c) projecting from the other surface of the base part to the second member. The plurality of first annular wall parts and the plurality of second annular wall parts are elastically deformed so as to fall to the inside when being sandwiched between the first member and the second member, and an inner peripheral edge of the base part is wholly provided with low elastic portions (12) disposed around the cylindrical part of the first member, and easily elastically deformed when coming in contact with an outer peripheral surface of the cylindrical part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a packing, and more particularly to a packing that is fitted around a cylindrical portion of a first member and is used by being sandwiched between the first member and a second member. [Background technology]

[0002] JP 2020-56495 A (Patent Document 1) describes a gasket. This gasket has inward-protruding locking portions provided only at the four corners of the gasket, and the inner periphery of the gasket does not get caught on the inner wall portion in the straight portions between the corners. This makes it less likely for distortion to occur in the straight portions of the gasket, reducing the risk of water leakage. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-56495 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if only a partial locking portion that protrudes inward is provided, as in the gasket (packing) described in Patent Document 1, the gasket's installation position may shift from the correct position, resulting in the risk of water leakage. On the other hand, if the entire inner periphery of the packing is configured to contact the inner wall, the entire packing cannot be stretched evenly when installed, and there is a risk that the packing may twist and not provide sufficient watertightness.

[0005] The present invention therefore aims to provide a packing that can be reliably positioned in the correct position between two components while reducing the risk of "twisting" when installed. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a gasket that is attached around the cylindrical portion of a first member and is used by being sandwiched between the first member and a second member, and that has an annular base portion that is arranged to surround the cylindrical portion of the first member, a plurality of first annular wall portions that protrude from one surface of the base toward the first member and abut against the first member, and a plurality of second annular wall portions that protrude from the other surface of the base toward the second member and abut against the second member, and that when sandwiched between the first member and the second member, the plurality of first annular wall portions and the plurality of second annular wall portions are elastically deformed so as to collapse inward, and the inner peripheral edge of the base is entirely provided with a low-elasticity portion that is arranged around the cylindrical portion of the first member and is easily elastically deformed when it comes into contact with the outer peripheral surface of the cylindrical portion.

[0007] According to the present invention configured as described above, the low-elasticity portion, which is disposed around the cylindrical portion of the first member and is easily elastically deformed when it comes into contact with the outer peripheral surface of the cylindrical portion, is provided along the entire inner peripheral edge of the base of the packing, so that the low-elasticity portion can easily deform, preventing the base of the packing from being excessively deformed. This makes it possible to install the packing reliably in the correct position, while reducing the risk of the base of the packing being significantly deformed during installation, causing twisting or the like, which would reduce the risk of watertightness being reduced.

[0008] In the present invention, the low elasticity portion is preferably composed of a number of protrusions that protrude radially inward from the inner periphery of the base portion, and the number of protrusions contact the outer circumferential surface of the cylindrical portion of the first member.

[0009] According to the present invention configured in this manner, the low-elasticity portion is provided with a number of protruding portions protruding radially inward from the inner periphery of the base, and since the many protruding portions contact the outer periphery surface of the cylindrical portion of the first member, the tips of the protruding portions are easily deformed, thereby reducing the elastic modulus of the entire inner periphery of the base. Furthermore, according to the present invention configured as described above, the front and back spaces of the packing are connected through the spaces between the protruding portions, so that deformation of the packing due to air trapped between the packing and the first or second member can be suppressed.

[0010] In the present invention, the protrusions of the low elasticity portion are preferably formed between the respective notches by forming a large number of notches in a row on the inner periphery of the base portion.

[0011] According to the present invention configured in this manner, by forming a large number of notches in a row on the inner circumference of the base, protrusions of the low elasticity section are formed between each notch.Therefore, even if the thickness of the low elasticity section is formed to be the same as that of the base, the elasticity of the low elasticity section as a whole can be reduced, and the low elasticity section can be formed easily.

[0012] In the present invention, the low elasticity portion is preferably formed by providing a portion on the inner periphery of the base portion that is thinner than the base portion.

[0013] According to the present invention configured in this manner, a low-elasticity portion is formed by providing a portion on the inner circumference of the base that is thinner than the base, so that the elasticity of the low-elasticity portion can be reduced uniformly over the entire inner circumference of the base, allowing the gasket to be installed in a more appropriate position. [Effects of the Invention]

[0014] The packing of the present invention can be reliably positioned in the correct position between two components, while reducing the risk of "twisting" occurring when installed. [Brief explanation of the drawings]

[0015] [Figure 1]FIG. 1 is a side cross-sectional view showing the entire flush toilet apparatus using a packing according to a first embodiment of the present invention. [Figure 2] FIG. 1 is an enlarged cross-sectional view showing the connection between the flush water tank and flush toilet main body of a flush toilet apparatus, fitted with a packing according to a first embodiment of the present invention. [Figure 3] 1 is a perspective view of a packing according to a first embodiment of the present invention. [Figure 4] 1 is an enlarged cross-sectional view showing a portion of a packing according to a first embodiment of the present invention. [Figure 5] 3 is an enlarged view showing a low elasticity portion provided on the inner peripheral edge of the packing according to the first embodiment of the present invention. FIG. [Figure 6] 1 is an enlarged cross-sectional view showing a state in which the packing according to the first embodiment of the present invention is housed in a recessed portion on the underside of a tank support member and before being compressed. [Figure 7] 3 is an enlarged cross-sectional view showing the packing according to the first embodiment of the present invention after it has been housed in a recess in the lower surface of the tank support member and compressed. FIG. [Figure 8] FIG. 6 is an enlarged cross-sectional view showing a portion of a packing according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] Next, a packing according to an embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 is a side cross-sectional view showing the entire flush toilet apparatus using a packing according to the first embodiment of the present invention. Figure 2 is a cross-sectional view showing an enlarged view of the connection between the flush water tank and the flush toilet main body of the flush toilet apparatus, fitted with a packing according to the first embodiment of the present invention.

[0017] As shown in Figure 1, the flush toilet device 1 comprises a ceramic flush toilet body 2, a resin toilet seat 4 and toilet lid 4a placed on the top surface of the flush toilet body 2, and a flush water tank 6 placed at the rear upper part of the flush toilet body 2.

[0018] The flush toilet body 2 is made of ceramic and is formed with a bowl portion 2a for receiving waste, a drain trap pipe 2b provided at the bottom of the bowl portion 2a, a jet water outlet 2c for jetting water, and a rim water outlet (not shown) for rim water outlet.

[0019] The flush water tank 6 is located at the upper rear of the flush toilet main body 2, and is configured to supply flush water to the jet spout 2c. Specifically, the flush water tank 6 comprises a flush water tank main body 6a which stores flush water, a drain valve 6b which discharges / stops the flush water in this flush water tank main body 6a, and a drain valve drive mechanism 6c which drives this drain valve 6b. The flush water tank main body 6a is then placed on top of a tank support member 8, and this tank support member 8 is fixed to the rear of the flush toilet main body 2.

[0020] Next, the structure for attaching the flush water tank 6 to the flush toilet main body 2 will be explained with reference to FIG. As shown in Figure 2, an inlet 2d for letting flush water in is formed on the upper rear surface of the flush toilet main body 2. This inlet 2d is connected to a jet water conduit 2e (Figure 2) formed inside the flush toilet main body 2, and flush water that flows in from the inlet 2d passes through the jet water conduit 2e and is discharged from the jet water outlet 2c, where it is used to flush the bowl portion 2a.

[0021] Additionally, the tank support member 8 has a water supply opening 8a at a position corresponding to the inlet 2d of the flush toilet main body 2. The tank support member 8 is a resin member, and is placed on the upper rear surface of the flush toilet main body 2, and supports the flush water tank main body 6a on the flush toilet main body 2. Additionally, the tank support member 8 is fixed to the flush toilet main body 2 with bolts 9 (only one is shown in Figure 2). The tank support member 8 is a box-shaped member overall, and the resin flush water tank main body 6a is placed inside the tank support member 8 and attached to it.

[0022] Furthermore, a water supply opening 8a is provided on the bottom surface of the tank support member 8. This water supply opening 8a is a circular opening, and the tank support member 8 is fixed to the flush toilet main body 2 so that the water supply opening 8a and the inlet 2d of the flush toilet main body 2 are aligned.

[0023] Furthermore, a gasket 10, which is the first embodiment of the present invention, is placed between the tank support member 8 and the flush toilet main body 2, ensuring watertightness between the tank support member 8 and the flush toilet main body 2. The gasket 10 is a circular rubber member, and is placed so that it surrounds the inlet 2d located on the top surface of the flush toilet main body 2. As a result, the gasket 10 is sandwiched between the underside of the tank support member 8, which is the first member, and the top surface of the flush toilet main body 2, which is the second member, ensuring watertightness between them. As described above, the tank support member 8 is fixed so that its water supply opening 8a is aligned with the inlet 2d of the flush toilet main body 2, and therefore the drain outlet of the flush water tank main body 6a attached to the tank support member 8 and the inlet 2d of the flush toilet main body 2 are also accurately aligned, ensuring reliably watertightness.

[0024] More specifically, a protrusion that protrudes downward is provided on the bottom surface of the flush water tank main body 6a, and a groove is formed on the outer surface of this protrusion, into which a circular O-ring, which is a radial packing, is fitted.

[0025] Meanwhile, a cylindrical portion 8b protruding downward is provided on the bottom surface of the tank support member 8 so as to surround the water supply opening 8a. Also, an annular upper surface recess 8c is formed on the upper surface of the bottom surface of the tank support member 8 so as to surround the water supply opening 8a. Meanwhile, an annular lower surface recess 8d is formed on the lower surface of the bottom surface of the tank support member 8 so as to surround the cylindrical portion 8b.

[0026] Furthermore, a protrusion protruding from the bottom surface of the flushing water tank main body 6a is received in the upper surface recess 8c formed on the upper surface of the tank support member 8, and an O-ring arranged on the outer periphery of this protrusion seals the gap between the flushing water tank main body 6a and the tank support member 8.

[0027] Meanwhile, a gasket 10 according to the first embodiment of the present invention is placed in an annular underside recess 8d formed on the underside of the tank support member 8. The gasket 10 is configured in an overall annular shape, and is fitted around a cylindrical section 8b formed on the inner periphery of the underside recess 8d, and is received within the underside recess 8d. The tank support member 8 is fixed to the upper rear surface of the flush toilet main body 2 by fastening bolts 9 to the flush toilet main body 2 through the tank support member 8. At this time, the gasket 10, which is placed in the underside recess 8d on the underside of the tank support member 8, is compressed between the tank support member 8 and the flush toilet main body 2. In other words, when the tank support member 8 is fixed to the flush toilet main body 2, the gasket 10 is sandwiched and crushed between the underside recess 8d of the tank support member 8 and the periphery of the inlet 2d of the flush toilet main body 2.

[0028] Next, the structure of the packing 10 will be described with reference to FIGS. Fig. 3 is a perspective view of the packing 10 according to the first embodiment of the present invention. Fig. 4 is a cross-sectional view showing an enlarged portion of the packing 10 of this embodiment. Fig. 5 is an enlarged view showing a low-elasticity portion provided on the inner peripheral edge of the packing 10 of this embodiment.

[0029] As shown in Figure 3, the packing 10 is an overall circular rubber member, and in this embodiment, it is arranged so as to surround the cylindrical portion 8b of the tank support member 8. Also, as shown in Figures 3 and 4, the packing 10 has an annular base 10a, multiple first annular wall portions 10b that extend from one surface of the base 10a toward the tank support member 8 (underside recess 8d), and multiple second annular wall portions 10c that extend from the other surface of the base 10a toward the flush toilet main body 2 (around the inlet 2d on the upper surface).

[0030] The base 10a is a circular, annular flat portion, and has a substantially circular opening formed on the inside of the base 10a. Furthermore, a low-elasticity portion 12 is provided on the entire inner peripheral edge of the base 10a, and is disposed around the cylindrical portion 8b of the tank support member 8. The low-elasticity portion 12 is easily elastically deformed when it comes into contact with the outer peripheral surface of the cylindrical portion 8b. The low-elasticity portion 12 is formed integrally with the base 10a and is more easily elastically deformed than the base 10a. The detailed configuration of the low-elasticity portion 12 will be described later.

[0031] The first annular wall portion 10b is a circular annular wall portion that protrudes from one surface of the base portion 10a toward the tank support member 8. In this embodiment, two first annular wall portions 10b are provided concentrically. The outer first annular wall portion 10b is provided along the outer peripheral edge of the base portion 10a and is configured to rise from the base portion 10a. The inner first annular wall portion 10b is provided inside the outer first annular wall portion 10b with a gap therebetween and is configured to rise from the base portion 10a. Furthermore, the outer and inner first annular wall portions 10b are configured to incline inward (toward the center of the packing 10). During actual use of the packing 10, the tip of each first annular wall portion 10b abuts against the lower surface recess 8d of the tank support member 8. When the packing 10 is pressed against the tank support member 8, each first annular wall portion 10b is elastically deformed so as to collapse inward.

[0032] The outer and inner first annular wall portions 10b are formed to the same height and inclined at the same angle. In this embodiment, the height of each first annular wall portion 10b is approximately 8 mm, and preferably, the height of each first annular wall portion 10b is approximately 6 mm to approximately 10 mm. In this embodiment, each first annular wall portion 10b is configured to form an angle of approximately 70 degrees with respect to the base portion 10a, and preferably, the angle of each first annular wall portion 10b is approximately 75 degrees to approximately 65 degrees. Furthermore, in this embodiment, the outer first annular wall portion 10b and the inner first annular wall portion 10b are disposed radially apart by approximately 5 mm. Preferably, the outer and inner first annular wall portions 10b are radially apart by approximately 3 mm to approximately 7 mm. In this embodiment, two first annular wall portions 10b are provided, but three or more first annular wall portions 10b may be provided.

[0033] Next, the second annular wall portion 10c (Fig. 4) is a circular annular wall portion that protrudes from the other surface of the base portion 10a toward the flush toilet main body 2, and in this embodiment, two second annular wall portions 10c are provided on concentric circles. Also, as shown in Fig. 4, in this embodiment, the second annular wall portion 10c is configured exactly the same as the first annular wall portion 10b, except that it is provided on the opposite surface of the base portion 10a, so a description of the dimensions and shape of the second annular wall portion 10c will be omitted. Furthermore, when the gasket 10 is actually in use, the tip of each second annular wall portion 10c abuts against the upper rear surface of the flush toilet main body 2, and when the gasket 10 is pressed against the flush toilet main body 2, each second annular wall portion 10c is elastically deformed so that it collapses inward.

[0034] Next, a specific configuration of the low elasticity portion 12 will be described with reference to FIG. 5, the low elasticity portion 12 is configured by forming a large number of fine notches 12a arranged in the inner periphery of the base portion 10a. That is, by forming a large number of fine notches 12a arranged at equal intervals in the inner periphery of the base portion 10a, a large number of protrusions 12b are formed between the notches 12a. When the tips of these protrusions 12b come into contact with the outer circumferential surface of the cylindrical portion 8b, each protrusion 12b (low elasticity portion 12) is elastically deformed.

[0035] Here, although each of the protrusions 12b constituting the low elasticity portion 12 has the same thickness and is formed of the same material as the base portion 10a of the packing 10, the notches 12a are formed between them, so that the tip of each of the protrusions 12b is easily compressively deformed, and the low elasticity portion 12 as a whole becomes a region that is more susceptible to elastic deformation than the base portion 10a. In other words, since many notches 12a are formed in a row on the inner periphery of the packing 10, it is easily elastically deformed, and the inner periphery of the packing 10 functions as the low elasticity portion 12 with a small apparent elastic modulus as a whole.

[0036] As shown in FIG. 5, in this embodiment, the notch 12a provided in the low elasticity portion 12 extends from the inner periphery to the outer periphery with a constant width, and the inner portion is formed in a semicircular shape. In this embodiment, the notch 12a has a width W1 of approximately 2 mm, a maximum depth D of approximately 2 mm, and a semicircular shape with a radius of approximately 1 mm at the inner portion. A large number of notches 12a having such a shape are arranged in a row at intervals of approximately 3 mm. Therefore, the width W2 of the tip of the protrusion 12b formed between each notch 12a is approximately 3 mm. Preferably, the width W2 of the tip of the protrusion 12b is set to approximately 1 mm to approximately 3 mm, and the radial length of the protrusion 12b (the depth of the notch 12a) is set to approximately 1 mm to approximately 3 mm.

[0037] In this embodiment, the inner diameter d1 of the low-elasticity portion 12 (the diameter of a circle connecting the tips of each protrusion 12b) is configured to be approximately 0.5 mm smaller than the outer diameter of the cylindrical portion 8b of the tank support member 8 into which the packing 10 is fitted. Therefore, the tip of each protrusion 12b is elastically deformed approximately 0.25 mm radially outward. Even when each protrusion 12b is elastically deformed in this manner, the deformed protrusion 12b does not fill the space of each notch 12a, and each protrusion 12b can easily elastically deform. Preferably, the amount of radial elastic deformation of the low-elasticity portion 12 is set to approximately 0.1 mm to approximately 1 mm.

[0038] In this way, the low-elasticity portion 12 is configured to be more elastically deformable than the base portion 10a, so even when the packing 10 is fitted into a cylindrical portion having an outer diameter larger than the inner diameter d1 of the low-elasticity portion 12, the low-elasticity portion 12 is primarily elastically deformed, with the base portion 10a being less likely to be deformed. This prevents the packing 10 from being properly attached due to twisting or the like occurring in the base portion 10a when the packing 10 is fitted into the cylindrical portion, which can result in poor sealing. In addition, the low-elasticity portion 12 is uniformly provided along the entire inner peripheral edge of the packing 10, so when the packing 10 is fitted into the cylindrical portion, the packing 10 is positioned concentrically in the appropriate position relative to the cylindrical portion.

[0039] In this embodiment, a large number of notches 12a are formed in a row on the inner periphery of the packing 10 to form the protrusion 12b with a constant width at the tip, but the protrusion can be formed in any shape. For example, the protrusion can be formed so that its width narrows toward the tip, or so that it becomes thinner toward the tip.

[0040] Next, the operation of the packing 10 according to the first embodiment of the present invention will be described with reference to FIGS. Fig. 6 is an enlarged cross-sectional view of the packing 10 housed in the recess 8d on the underside of the tank support member 8, showing the state before the packing 10 is compressed. Fig. 7 is an enlarged cross-sectional view of the packing 10 housed in the recess 8d on the underside of the tank support member 8, showing the state after the packing 10 is compressed.

[0041] As shown in FIG. 6 , a bottom recess 8d is formed on the underside of the bottom surface of the tank support member 8, and a cylindrical portion 8b is provided on its inner periphery. The packing 10 is placed in the bottom recess 8d by fitting the packing 10 around the cylindrical portion 8b. At this time, the low-elasticity portion 12 provided on the inner periphery of the packing 10 is easily deformed, so the base portion 10a is not significantly deformed and remains generally flat. In this embodiment, the length of the cylindrical portion 8b is longer than the depth of the bottom recess 8d, and the cylindrical portion 8b protrudes downward from the bottom recess 8d. Furthermore, the overall thickness of the packing 10 is thicker than the depth of the bottom recess 8d, and when the packing 10 is fitted around the cylindrical portion 8b, the lower side of the packing 10 protrudes downward from the bottom recess 8d.

[0042] In this state, when the tank support member 8 is placed on the upper rear surface of the flush toilet body 2, as shown in Figure 7, the packing 10 is compressed a predetermined amount within the underside recess 8d. This causes the first annular wall portion 10b and second annular wall portion 10c of the packing 10 to elastically deform and collapse inward, and the entire packing 10 is housed within the underside recess 8d. As a result, the base portion 10a of the packing 10 is also forced outward in the radial direction. In this embodiment, when in use, the packing 10 is compressed to approximately half its thickness. At this time, the elastic deformation of the first annular wall portion 10b presses the tip of the first annular wall portion 10b into the underside recess 8d, ensuring watertightness between the packing 10 and the tank support member 8. Additionally, as the second annular wall portion 10c is elastically deformed, the tip of the second annular wall portion 10c is pressed against the periphery of the inlet 2d on the top surface of the flush toilet main body 2, ensuring watertightness between the gasket 10 and the flush toilet main body 2.

[0043] According to the packing 10 of the first embodiment of the present invention, the low-elasticity portion 12, which is disposed around the cylindrical portion 8b of the tank support member 8, which is the first member, and which is easily elastically deformed when it comes into contact with the outer peripheral surface of the cylindrical portion 8b, is provided all over the inner peripheral edge of the base portion 10a of the packing 10, so that the low-elasticity portion 12 can easily deform, thereby preventing excessive deformation of the base portion 10a of the packing 10. This makes it possible to reliably install the packing 10 in the appropriate position, while suppressing the risk of the base portion 10a of the packing 10 being significantly deformed when the packing 10 is installed, causing twisting or the like, which would reduce the risk of a decrease in watertightness.

[0044] Furthermore, according to the packing 10 of this embodiment, the low-elasticity portion 12 is provided with a large number of protrusions 12b that protrude radially inward from the inner periphery of the base 10a, and because the large number of protrusions 12b come into contact with the outer surface of the cylindrical portion 8b of the tank support member 8, the tip of each protrusion 12b is easily deformed, making it possible to lower the elastic modulus of the entire inner periphery of the base 10a. Furthermore, according to this embodiment, the space on the front side and the space on the back side of the packing 10 are connected through the spaces between each protrusion 12b, making it possible to prevent the packing 10 from being deformed by air trapped between the packing 10 and the tank support member 8 or the flush toilet body 2.

[0045] Furthermore, according to the packing 10 of this embodiment, by forming a large number of notches 12a in a row on the inner circumference of the base 10a, protrusions 12b of the low elasticity portion 12 are formed between each notch 12a. Therefore, even if the thickness of the low elasticity portion 12 is formed to be the same thickness as that of the base 10a, the elasticity of the low elasticity portion 12 as a whole can be reduced, and the low elasticity portion 12 can be formed easily.

[0046] Next, a packing according to a second embodiment of the present invention will be described with reference to FIG. The packing according to the second embodiment of the present invention differs from the first embodiment in the structure of the low-elasticity portion. Therefore, only the parts of the second embodiment of the present invention that are different from the first embodiment will be described below, and a description of the same configurations, actions, and effects will be omitted. Figure 8 is an enlarged cross-sectional view showing a part of the packing according to the second embodiment of the present invention.

[0047] The packing 20 of this embodiment is an annular rubber member overall, and is disposed so as to surround a cylindrical portion (not shown) of a first member. As shown in Fig. 8, the packing 20 has an annular base portion 20a, a plurality of first annular wall portions 20b extending from one surface of the base portion 20a toward the first member, and a plurality of second annular wall portions 20c extending from the other surface of the base portion 20a toward a second member (not shown). The configurations of the base portion 20a, the first annular wall portion 20b, and the second annular wall portion 20c are the same as those of the first embodiment described above, and therefore description thereof will be omitted.

[0048] Furthermore, a low-elasticity portion 22 is integrally formed on the inner periphery of the base portion 20a so as to protrude radially inward from the base portion 20a. This low-elasticity portion 22 is an annular portion formed on the inner periphery of the base portion 20a and thinner than the base portion 20a, and is provided concentrically on the inner periphery of the base portion 20a. As such, the low-elasticity portion 22 is formed thinner than the base portion 20a, and is therefore more easily elastically deformed than the base portion 20a. In this embodiment, the width of the low-elasticity portion 22 is approximately 3 mm, and the thickness is approximately 1 mm. Preferably, the low-elasticity portion 22 is formed to be approximately 25% to 75% of the thickness of the base portion 20a.

[0049] By providing the low-elasticity portion 22, when the packing 20 is fitted into a cylindrical portion (not shown) of a first member having an outer diameter larger than the inner diameter of the low-elasticity portion 22, mainly the low-elasticity portion 22 elastically deforms radially outward, and deformation is less likely to extend to the base portion 20a. This makes it possible to prevent twisting or the like from occurring in the base portion 20a when the packing 20 is fitted into the cylindrical portion, preventing the packing 20 from being properly attached and resulting in poor sealing. Furthermore, because the low-elasticity portion 22 is provided with a uniform width along the entire inner peripheral edge of the packing 20, when the packing 20 is fitted into the cylindrical portion, the packing 20 is positioned concentrically in the appropriate position relative to the cylindrical portion.

[0050] According to the packing 20 of the second embodiment of the present invention, a low elasticity portion 22 is formed by providing a portion on the inner periphery of the base 20a that is thinner than the base 20a, so that the elasticity of the low elasticity portion 22 can be reduced uniformly over the entire inner periphery of the base 20a, and the packing 20 can be installed in a more appropriate position.

[0051] The above describes an embodiment of the present invention, but various modifications can be made to the above-described embodiment. In particular, in the above-described embodiment, the gasket 10 is placed between the tank support member 8 (a first member) and the flush toilet main body 2 (a second member) to seal the space between them, but the present invention can be applied to a gasket placed between any other members. [Explanation of symbols]

[0052] 1 Flush toilet device 2. Flush toilet body (second component) 2a Bowl section 2b Drain trap pipe 2c Jet Spout 2d inlet 2e Jet Waterway 4 toilet seats 4a Toilet lid 6 Cleaning water tank 6a Cleaning water tank body 6b Drain valve 6c Drain valve drive mechanism 8 Tank support member (first member) 8a Water supply opening 8b Cylindrical part 8c Top recess 8d Bottom recess 9 volts 10. Packing 10a base 10b First annular wall portion 10c Second annular wall portion 12 Low elasticity section 12a Notch 12b Projection 20 Gasket 20a base 20b First annular wall portion 20c Second annular wall portion 22 Low elasticity section

Claims

1. A packing that is attached to the periphery of a cylindrical portion of a first member and is used by being sandwiched between the first member and a second member, an annular base portion disposed to surround the cylindrical portion of the first member; a plurality of first annular wall portions that protrude from one surface of the base portion toward the first member and abut against the first member; a plurality of second annular wall portions that protrude from the other surface of the base toward the second member and abut against the second member; the plurality of first annular wall portions and the plurality of second annular wall portions are elastically deformed so as to collapse inward when sandwiched between the first member and the second member, A packing characterized in that the inner peripheral edge of the base is entirely provided with a low-elasticity portion that is arranged around the cylindrical portion of the first member and is easily elastically deformed when it comes into contact with the outer peripheral surface of the cylindrical portion.

2. 2. A packing according to claim 1, wherein the low-elasticity portion is composed of a plurality of protrusions protruding radially inward from the inner periphery of the base portion, and the plurality of protrusions contact the outer circumferential surface of the cylindrical portion of the first member.

3. 3. The packing according to claim 2, wherein the protrusions of the low elasticity portion are formed between a number of notches arranged side by side on the inner periphery of the base portion.

4. 2. The packing according to claim 1, wherein the low elasticity portion is formed by providing a portion on the inner periphery of the base portion that is thinner than the base portion.

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