JP2017096058A - Cut-off structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cut-off structure which uses packing comprising a fin part with flexibility, and which prevents defective cut-off from being caused because the fin part sticks to an abutting surface.SOLUTION: Packing 7, which assumes a circular shape in a plan view, comprises a fin part 8 having flexibility on an outer peripheral side. A valve body 5 serving as a drainage device has the packing 7 fitted to its periphery, and has a backside provided with an abutting surface 9 abutting when the packing 7 is deformed. Groove parts 6 are formed as a sticking prevention mechanism in a plurality of places on the abutting surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water stop structure in a drain pipe.

  Conventionally, as a water stop structure in a drain pipe, a structure using a packing made of an elastic member such as rubber attached to a drainage device is known. In the water stop structure using the packing, water is stopped when the packing is in close contact with a drain plug or other piping.

The water stop structure shown in FIG. 15 is a water stop structure with a valve body as a drainage tool and a packing attached to the valve body.
The valve body is a lid body with a packing fitted around it, and is provided with a lock mechanism called a thrust lock mechanism below.
The thrust lock mechanism includes a lock shaft, a rotation gear, a fixed gear, and a spring. When the rotation gear and the fixed gear are engaged with each other, the valve body can be switched between the raised state and the lowered state for each pushing operation. The lock shaft is fitted to the back surface of the valve body, and moves up and down based on a pushing operation applied to the valve body. The rotation gear is arranged in the middle of the lock shaft and is driven by the vertical movement of the lock shaft, but is rotatable with respect to the lock shaft. The fixed gear includes an upper gear and a lower gear. The upper gear and the lower gear include inclined teeth that rotate the rotating gear by a predetermined angle, and the upper gear includes a locking tooth that meshes with the rotating gear.

  The operation of the conventional water stop structure will be described below.

First, when a pushing operation is directly applied to the valve body from a state where the valve body is raised, the lock shaft and the rotating gear are pushed down along with the pushing operation. At this time, the rotating gear is brought into sliding contact with the inclined teeth of the lower gear by the depression and rotates by a predetermined angle. When the pushing operation is finished, the lock shaft and the rotating gear are slightly lifted by the repulsion of the spring. Mesh with. At this time, the valve body is kept in the lowered state lower than the initial state by the meshing, and the drainage port is in a water-stopped state when the packing attached to the valve body is in close contact with the drainage port.
When the pushing operation is applied to the valve body again from the lowering state of the valve body, the lock shaft and the rotating gear are pushed down so that the rotating gear comes into sliding contact with the inclined teeth of the lower gear, and the rotating gear rotates again by a predetermined angle. The meshing with the upper gear is released. At this time, the valve body is raised by the repulsion of the spring, and the packing is separated from the drainage port, so that the water stop state is released.
That is, in the water stop structure, the drain lock is opened and closed by the thrust lock mechanism switching between the lifted state and the lowered state of the valve body every time the pushing operation is performed.

Here, as shown in FIG. 16, in the water stop structure, as described above, after the valve body is pushed down to the maximum, the lowered state is not maintained unless the valve body is slightly raised to the height at which the rotating gear and the upper gear mesh. (In FIG. 16, the state where the valve body is lowered to the maximum is indicated by a two-dot chain line.)
Therefore, the packing cannot stop water unless it absorbs the height H from the state where the valve body is lowered to the maximum to the height position where the rotating gear and the upper gear mesh. For this reason, the conventional waterproof structure packing is provided with a flexible fin portion, and deforms so that the fin portion is warped when the drain port is peripheral, and absorbs the height H.

  In addition to the above, as shown in FIG. 17, a water stop structure using a packing and a water stop structure using a packing attached to the water stop lid is known as a water stop structure using a packing. The waterproofing lid is a lid member having a packing fitted around it, and is placed on the drainage port so that the packing is in close contact with the periphery of the drainage port to stop the water.

JP 10-165322 A JP-A-8-68091

Of the above-described conventional water stop structures, in the water stop structure using a valve body, when the fin portion of the packing is greatly deformed, such as when the valve body is lowered, the fin portion may contact the valve body or the packing itself. . At this time, as shown in FIG. 18, the fin portion and the contact surface are in close contact with each other without any gap, so that the space between the fin portion and the contact surface is in a vacuum state, and the deformed fin portion is in contact with the contact surface. There was a problem of sticking to and unable to return. In this state, even if the valve body is in the lowered state, the packing remains separated from the periphery of the drain port, and it becomes impossible to stop the drain port.
Note that the above problem is likely to occur because the surface tension of water acts between the fin portion and the contact surface when the valve body is pushed in with hot water stored in the tank.

  The above problem is not limited to the case where the lock mechanism is a thrust lock mechanism. The same problem occurs when the lock mechanism is replaced with a lock mechanism using another cam structure such as the one-way cam described in Patent Document 1. It will occur.

  Moreover, as shown in FIG. 19, the said problem arises also in the water stop structure by a water stop lid. In particular, in a waterproofing lid capable of stopping water of tank bodies of different materials, shapes, etc., since the fin portion is configured to be greatly deformed to absorb the shape difference of the drainage port, the above-mentioned is particularly noticeable. Problems arise.

  The present invention was invented in view of the above problems, and in a water stop structure using a packing having a flexible fin portion, the water stop defect due to the fin portion sticking to the contact surface. The purpose is to provide a water stop structure that prevents water leakage.

The present invention according to claim 1 includes a drainage tool,
In the water stop structure equipped with a packing that is attached to the drainage and performs watertightness with other members,
The packing has an elastic fin part,
The water stop structure is characterized by including a sticking prevention mechanism that prevents the fin portion from sticking to the drainage device or the packing itself.

  In addition, the above-mentioned “the fin part sticks to the drainage tool or the packing itself” means that the fin part comes into contact with the drainage tool or the packing itself and cannot return to the original state in the contact state. It does not simply refer to contact with no gap.

The present invention described in claim 2 is characterized in that the drainage device or packing includes a contact surface that contacts the deformed fin portion,
The waterproof structure according to claim 1, wherein the sticking prevention mechanism is formed on the contact surface.

  The present invention described in claim 3 is the water stop structure according to claim 1 or 2, wherein the sticking prevention mechanism is a groove.

  The “groove portion” includes a groove, a concave portion, a stepped groove, and the like, and is included in the “groove portion” when it is recessed from other portions.

  The present invention described in claim 4 is the water stop structure according to any one of claims 1 to 3, wherein the sticking prevention mechanism is a protrusion.

The “protrusion” includes protrusions, protrusions, protrusions due to steps, and the like, and includes a “projection” when protruding from other portions.
The sticking prevention mechanism may be formed by both the “groove” and the “projection”.

The present invention according to claim 5 is characterized in that the sticking prevention mechanism is
It is provided in the drainage tool, It is a water stop structure as described in any one of Claims 1 thru | or 4 characterized by the above-mentioned.

The present invention according to claim 6 is characterized in that the sticking prevention mechanism is
It is provided in packing, It is a water stop structure as described in any one of Claim 1 thru | or 5 characterized by the above-mentioned.

The present invention described in claim 7 is a valve body in which the drainage tool opens and closes the drainage port of the tank body,
The said valve body is provided with the locking mechanism which switches a raising state and a descending state of a valve body, whenever a pushing operation is added to a valve body, The one of Claim 1 thru | or 6 characterized by the above-mentioned. It has a water stop structure.

According to this invention of Claim 1, it becomes possible to prevent the water stop failure by a fin part sticking to a drainage tool or packing itself by providing a water stop structure with a sticking prevention mechanism.
According to the second aspect of the present invention, since the sticking prevention mechanism is formed on the contact surface, sticking of the fin portion can be more effectively prevented.
According to this invention of Claim 3 thru | or 6, the specific shape and position of a sticking prevention mechanism can be shown.
In addition, the present invention described in claims 1 to 6 is particularly useful for a valve body having a lock mechanism as shown in claim 7.

It is sectional drawing and the principal part enlarged view which show the construction state of 1st embodiment. It is A-A 'sectional drawing of (a) sectional drawing (b) and (a) which shows a valve body. It is sectional drawing which shows the raising state of a valve body. It is sectional drawing which shows the state which the valve body is pushed down and packing is deform | transforming greatly. It is a reference drawing which shows operation | movement of a thrust lock mechanism. It is sectional drawing which shows the downward state of a valve body. It is sectional drawing and the principal part enlarged view which show the construction state of 2nd embodiment. It is A-A 'sectional drawing of (a) sectional drawing (b) and (a) which shows a valve body. It is sectional drawing which shows the raising state of a valve body. It is sectional drawing which shows the state which the valve body is pushed down and packing is deform | transforming greatly. It is a reference drawing which shows operation | movement of a thrust lock mechanism. It is sectional drawing which shows the downward state of a valve body. It is A-A 'sectional drawing of (a) sectional drawing (b) (a) which shows the valve body which concerns on 3rd embodiment. It is an exploded sectional view showing a fourth embodiment. It is sectional drawing which shows the conventional water stop structure. It is sectional drawing which shows the downward state of the valve body in the conventional water stop structure. It is an exploded sectional view showing other water stop structures. It is sectional drawing which shows the state which packing stuck to the contact surface. It is sectional drawing which shows the state which packing stuck to the contact surface in the other water stop structure.

  Below, the water stop structure of this invention is demonstrated, referring drawings. Note that the description given below facilitates understanding of the embodiment, and the present invention is not limited and understood by this. Moreover, in the following embodiments, the positional relationship between the upper and lower sides and the members and members will be described based on the construction state shown in FIG. 1 unless otherwise specified.

  As shown in FIG. 1 to FIG. 6, the present embodiment is a water stop structure that stops the drain port 1 formed in the tank body B by a valve body 5 as a drainage tool.

The tank body B is a box-shaped wash bowl whose upper part is opened, and a drain plug 2 is attached to an opening formed on the bottom surface.
The drain plug 2 is a cylindrical member having a flange at the upper end, in which a drain port 1 for discharging the drainage from the tank body B is formed, and a male screw is screwed on the outer periphery of the cylindrical portion. It is engraved. Further, the tubular portion of the drain plug 2 is inserted into an opening formed on the bottom surface of the tank body B and is screwed with a connection pipe 3 disposed on the back surface of the tank body B. The connection pipe 3 is screwed to the lower end of the drain plug 2 by a female screw threaded on the upstream side, and the downstream side is connected to a drain trap (not shown) using a nut and packing.
The drain trap is a piping member bent in a substantially S shape in a side view, and can store a part of the drain water flowing into the inside at the bent portion. The drainage trap forms a sealed water by filling a part of the drainage channel with the drainage, and can prevent backflow of odors and pests from the downstream side.

  The valve body 5 is a lid member in which a packing 7 is fitted around and the upper end of a thrust lock mechanism 10 as a lock mechanism is attached to the back surface. The upper end of the drain plug 2 and the packing 7 are in close contact with each other. The drain port 1 is closed watertight.

  As shown in FIG. 2, the valve body 5 includes a contact surface 9 that contacts when the packing 7 is elastically deformed on the back surface, and a plurality of groove portions 6 are formed on the contact surface 9 as sticking prevention mechanisms. Yes. The groove portion 6 is a groove formed at three positions every 120 degrees on the contact surface 9 and extends radially from the center of the valve body 5 toward the outer periphery. The outer end of the groove 6 is disposed outside the outer diameter of the packing 7.

  The packing 7 is made of an elastic member such as rubber or silicon, has a substantially circular shape in plan view, and includes a fin portion 8 on the outer peripheral side. The fin portion 8 is a thin annular portion extending at the outer peripheral portion of the packing 7, and is flexible enough to be elastically deformed when contacting the drain plug 2. In addition, as shown in FIG. 3, the upper surface side of the fin part 8 does not contact | abut with the contact surface 9 in normal time. On the other hand, as shown in FIG. 4, the upper surface side of the fin portion 8 is warped when the fin portion 8 is largely deformed, and comes into contact with the protruding portion 25 formed on the contact surface 9.

The thrust lock mechanism 10 is a lock mechanism disposed or formed inside the casing 11, and includes a lock shaft 12, a rotation cam 13, a fixed cam 15, a cam groove 18, and a spring 19, and an eye plate 21 is formed on the outer periphery. ing. FIG. 5 is a reference diagram for facilitating the understanding of the invention, and shows the rotating cam 13, the fixed cam 15 and the like of the thrust lock mechanism 10 developed.
The lock shaft 12 is a shaft portion that passes through the center of the thrust lock mechanism 10, and its upper end is fitted to the back surface of the valve body 5 and is urged upward by the repulsion of the spring 19. In addition, the rotary cam 13 is rotatably attached to the lock shaft 12 in the middle thereof.
The rotary cam 13 is a cam member that is driven by the operation of the lock shaft 12 in the axial direction, and is rotatably attached about the lock shaft 12 as a shaft. Is formed.
The fixed cam 15 includes an upper gear 16 and a lower gear 17. The upper gear 16 is formed on the inner periphery of the casing 11 and includes sawtooth-shaped inclined teeth 16 a that rotate the rotating cam 13 and locking teeth 16 b that mesh with the rotating cam 13. The lower gear 17 is formed over the entire upper periphery of the lower member 20 inserted from the lower end of the casing 11, and includes sawtooth-shaped inclined teeth 17 a that rotate the rotating cam 13.
The cam groove 18 is a groove-like portion extending between the upper gears 16 at predetermined intervals with respect to the axial direction of the casing 11.
The spring 19 is a metal elastic member, the lower end of which is in contact with the lower member 20 and biases the lock shaft 12 upward.
It has a mesh-like collection part that collects hair and the like mixed in the waste water flowing from the tank body B of the eye plate 21, and the outer diameter thereof is substantially the same as the inner diameter of the drain plug 2.

  The water stop structure comprised from each said member operate | moves as follows.

First, as shown in FIG. 3, when the valve body 5 is in a raised state, the rotating teeth 14 of the rotating cam 13 are disposed in the cam groove 18. In this state, the rotating cam 13 and the fixed cam 15 are not meshed with each other, and the valve body 5 fitted to the upper end of the lock shaft 12 is maintained in the raised state by the repulsion of the spring 19. Further, when the valve body 5 is raised, the packing 7 is separated from the peripheral edge of the drain port 1.
When a pushing operation is directly applied to the valve body 5 in the raised state, the valve body 5, the lock shaft 12 and the rotating cam 13 are pushed down in accordance with the pushing operation. Then, the rotating teeth 14 of the rotating cam 13 are brought into sliding contact with the inclined teeth 17a of the lower gear 17 by the depression and rotate by a predetermined angle. At this time, as shown in FIG. 4, the fin portion 8 of the packing 7 warps upward by contacting the upper surface of the drain plug 2, and the upper surface of the fin portion 8 contacts the contact surface 9 of the valve body 5. . However, since the groove portion 6 as a sticking prevention mechanism is formed on the contact surface 9, a vacuum state is not achieved.
When the pushing operation is finished, the lock shaft 12 and the rotating cam 13 are raised by the repulsion of the spring 19. The rotating teeth 14 of the rotating cam 13 are pressed against the inclined teeth 16a of the upper gear 16 by the repulsion of the spring 19 to rotate by a predetermined angle and mesh with the locking teeth 16b. (FIG. 5A) At this time, the valve body 5 shifts from the state shown in FIG. 4 to the state shown in FIG. 6, and the valve body 5 is kept in the lowered state by the engagement of the rotating cam 13 and the fixed cam 15 (upper gear 16). Is done. At this time, the fin portion 8 is gradually deformed while being in contact with the drain plug 2, thereby maintaining the close contact between the packing 7 and the periphery of the drain port 1 (drain plug 2). That is, the packing 7 has a height H from the state where the valve body 5 is lowered to the maximum position to the height position where the rotary cam 13 and the upper gear 16 mesh with each other due to the elastic deformation of the flexible fin portion 8. Absorb. In addition, in FIG. 6, the position of the valve body 5 when the valve body 5 descend | falls to the maximum is shown with the dashed-two dotted line.

When the pushing operation is again applied to the valve body 5 from the lowered state of the valve body 5, the lock shaft 12 and the rotating cam 13 are pushed down, and the rotating teeth 14 of the rotating cam 13 slide with the inclined teeth 17 a of the lower gear 17. The meshing with the locking teeth 16b of the upper gear 16 is released by contacting and rotating by a predetermined angle. At this time, the valve body 5 is again in the state shown in FIG. 4, and the fin portion 8 is greatly deformed by being pressed against the drain plug 2, but since the groove portion 6 is formed on the contact surface 9, for example, the tank body Even if a push operation is applied to the valve body 5 in a state where hot water is stored in B, the fin portion 8 does not remain attached to the contact surface 9 of the valve body 5.
When the pushing operation is finished, the lock shaft 12 and the rotating cam 13 are lifted by the repulsion of the spring 19, and the rotating tooth 14 of the rotating cam 13 is pressed against the inclined tooth 16a of the upper gear 16 and slides to form a cam groove. Since the valve body 5 is housed in 18 (FIG. 5B), the valve body 5 is kept in the raised state by the bias of the spring 19. Further, the packing 7 is separated from the drain plug 2 and the drain port 1 is opened. However, since the packing 7 is prevented from sticking to the contact surface 9 by the protruding portion 25, it sticks to the contact surface 9. It is possible to return to the original state.

As described above, the first embodiment of the present invention has a structure in which the thrust lock mechanism 10 switches between the raised state and the lowered state of the valve body 5. Therefore, as shown in FIGS. 5 and 6, when the valve body 5 is switched to the lowered state, after the valve body 5 is pushed down to the maximum, the rotating teeth 14 of the rotating cam 13 and the locking teeth 16 b of the upper gear 16 are moved. It rises by the height H up to the meshing height position. However, in the present invention, the packing 7 includes a flexible fin portion 8, and the fin portion 8 is elastically deformed to absorb the height H, and the valve body 5 maintains the closed state of the drain port 1. can do.
Even when the upper surface of the fin portion 8 and the contact surface 9 of the valve body 5 come into contact with each other during the elastic deformation, the contact surface 9 has a groove 6 as a sticking prevention mechanism. Therefore, it is possible to prevent the fin portion 8 from sticking to the contact surface 9. Even if a push operation is applied to the valve body 5 while hot water is stored in the tank body B, a slight gap is formed by the groove portion 6, so that the upper surface of the fin portion 8 and the contact surface The hot water or the like that has entered between 9 and 9 is discharged from the gap, and a vacuum state due to surface tension does not occur. Further, since the outer end of the groove portion 6 is disposed outside the outer diameter of the packing 7, it is possible to always form a gap with the contact surface 9 when the fin portion 8 is elastically deformed. .

  The second embodiment of the present invention will be described below.

  As shown in FIGS. 7 to 12, the present embodiment is a water stop structure that stops the drain port 1 formed in the tank body B by a valve body 5 as a drainage tool.

The tank body B is a box-shaped wash bowl whose upper part is opened, and a drain plug 2 is attached to an opening formed on the bottom surface.
The drain plug 2 is a cylindrical member having a flange at the upper end, in which a drain port 1 for discharging the drainage from the tank body B is formed, and a male screw is screwed on the outer periphery of the cylindrical portion. It is engraved. Further, the tubular portion of the drain plug 2 is inserted into an opening formed on the bottom surface of the tank body B and is screwed with a connection pipe 3 disposed on the back surface of the tank body B. The connection pipe 3 is screwed to the lower end of the drain plug 2 by a female screw threaded on the upstream side, and the downstream side is connected to a drain trap (not shown) using a nut and packing.
The drain trap is a piping member bent in a substantially S shape in a side view, and can store a part of the drain water flowing into the inside at the bent portion. The drainage trap forms a sealed water by filling a part of the drainage channel with the drainage, and can prevent backflow of odors and pests from the downstream side.

  The valve body 5 is a lid member in which a packing 7 is fitted around and the upper end of a thrust lock mechanism 10 as a lock mechanism is attached to the back surface. The upper end of the drain plug 2 and the packing 7 are in close contact with each other. The drain port 1 is closed watertight.

  As shown in FIG. 7, the valve body 5 includes a contact surface 9 that contacts when the packing 7 is elastically deformed on the back surface, and a plurality of protrusions 25 are formed on the contact surface 9 as sticking prevention mechanisms. ing. The protrusions 25 are protrusions formed on the contact surface 9 at every 120 degrees, and extend radially from the center of the valve body 5 toward the outer periphery. The outer end of the protrusion 25 is disposed outside the outer diameter of the packing 7.

  The packing 7 is made of an elastic member such as rubber or silicon, has a substantially circular shape in plan view, and includes a fin portion 8 on the outer peripheral side. The fin portion 8 is a thin annular portion extending at the outer peripheral portion of the packing 7, and is flexible enough to be elastically deformed when contacting the drain plug 2. In addition, as shown in FIG. 9, the upper surface side of the fin part 8 does not contact | abut with the contact surface 9 in normal time. On the other hand, as shown in FIG. 10, the upper surface side of the fin portion 8 is warped when the fin portion 8 is largely deformed, and comes into contact with the protruding portion 25 formed on the contact surface 9.

The thrust lock mechanism 10 is a lock mechanism disposed or formed inside the casing 11, and includes a lock shaft 12, a rotation cam 13, a fixed cam 15, a cam groove 18, and a spring 19, and an eye plate 21 is formed on the outer periphery. ing. FIG. 11 is a reference diagram for facilitating the understanding of the invention, and shows the rotary cam 13 and the fixed cam 15 of the thrust lock mechanism 10 in an expanded state.
The lock shaft 12 is a shaft portion that passes through the center of the thrust lock mechanism 10, and its upper end is fitted to the back surface of the valve body 5 and is urged upward by the repulsion of the spring 19. In addition, the rotary cam 13 is rotatably attached to the lock shaft 12 in the middle thereof.
The rotary cam 13 is a cam member that is driven by the operation of the lock shaft 12 in the axial direction, and is rotatably attached about the lock shaft 12 as a shaft. Is formed.
The fixed cam 15 includes an upper gear 16 and a lower gear 17. The upper gear 16 is formed on the inner periphery of the casing 11 and includes sawtooth-shaped inclined teeth 16 a that rotate the rotating cam 13 and locking teeth 16 b that mesh with the rotating cam 13. The lower gear 17 is formed over the entire upper periphery of the lower member 20 inserted from the lower end of the casing 11, and includes sawtooth-shaped inclined teeth 17 a that rotate the rotating cam 13.
The cam groove 18 is a groove-like portion extending between the upper gears 16 at predetermined intervals with respect to the axial direction of the casing 11.
The spring 19 is a metal elastic member, the lower end of which is in contact with the lower member 20 and biases the lock shaft 12 upward.
It has a mesh-like collection part that collects hair and the like mixed in the waste water flowing from the tank body B of the eye plate 21, and the outer diameter thereof is substantially the same as the inner diameter of the drain plug 2.

  The water stop structure comprised from each said member operate | moves as follows.

First, as shown in FIG. 9, the rotating teeth 14 of the rotating cam 13 are disposed in the cam groove 18 in a state where the valve body 5 is raised. In this state, the rotating cam 13 and the fixed cam 15 are not meshed with each other, and the valve body 5 fitted to the upper end of the lock shaft 12 is maintained in the raised state by the repulsion of the spring 19. Further, when the valve body 5 is raised, the packing 7 is separated from the peripheral edge of the drain port 1.
When a pushing operation is directly applied to the valve body 5 in the raised state, the valve body 5, the lock shaft 12 and the rotating cam 13 are pushed down in accordance with the pushing operation. Then, the rotating teeth 14 of the rotating cam 13 are brought into sliding contact with the inclined teeth 17a of the lower gear 17 by the depression and rotate by a predetermined angle. At this time, as shown in FIG. 10, the fin portion 8 of the packing 7 warps upward by contacting the upper surface of the drain plug 2, and the upper surface of the fin portion 8 contacts the contact surface 9 of the valve body 5. . However, since the protrusion portion 25 as a sticking prevention mechanism is formed on the contact surface 9, a slight gap is formed between the upper surface of the fin portion 8 and the contact surface 9 of the valve body 5, and vacuum It will not be in a state.
When the pushing operation is finished, the lock shaft 12 and the rotating cam 13 are raised by the repulsion of the spring 19. The rotating teeth 14 of the rotating cam 13 are pressed against the inclined teeth 16a of the upper gear 16 by the repulsion of the spring 19 to rotate by a predetermined angle and mesh with the locking teeth 16b. (FIG. 11A) At this time, the valve body 5 shifts from the state shown in FIG. 10 to the state shown in FIG. 12, and the valve body 5 is kept in the lowered state by the engagement of the rotating cam 13 and the fixed cam 15 (upper gear 16). Is done. At this time, the fin portion 8 is gradually deformed while being in contact with the drain plug 2, thereby maintaining the close contact between the packing 7 and the periphery of the drain port 1 (drain plug 2). That is, the packing 7 has a height H from the state where the valve body 5 is lowered to the maximum position to the height position where the rotary cam 13 and the upper gear 16 mesh with each other due to the elastic deformation of the flexible fin portion 8. Absorb. In addition, in FIG. 12, the state which the valve body 5 fell to the maximum is shown with the dashed-two dotted line.

When the pushing operation is again applied to the valve body 5 from the lowered state of the valve body 5, the lock shaft 12 and the rotating cam 13 are pushed down, and the rotating teeth 14 of the rotating cam 13 slide with the inclined teeth 17 a of the lower gear 17. The meshing with the locking teeth 16b of the upper gear 16 is released by contacting and rotating by a predetermined angle. At this time, the valve body 5 is brought into the state shown in FIG. 10 again, and the fin portion 8 is greatly deformed by being pressed against the drain plug 2. However, since the protrusion portion 25 is formed on the abutment surface 9, an example tank Even if a pressing operation is applied to the valve body 5 while hot water is stored in the body B, the fin portion 8 does not remain stuck to the contact surface 9 of the valve body 5.
When the pushing operation is finished, the lock shaft 12 and the rotating cam 13 are lifted by the repulsion of the spring 19, and the rotating tooth 14 of the rotating cam 13 is pressed against the inclined tooth 16a of the upper gear 16 and slides to form a cam groove. 18 (FIG. 11B), the valve body 5 is kept in the raised state by the bias of the spring 19. Further, the packing 7 is separated from the drain plug 2 and the drain port 1 is opened. However, since the packing 7 is prevented from sticking to the contact surface 9 by the protruding portion 25, it sticks to the contact surface 9. It is possible to return to the original state.

As described above, the first embodiment of the present invention has a structure in which the thrust lock mechanism 10 switches between the raised state and the lowered state of the valve body 5. Therefore, as shown in FIGS. 11 and 12, when the valve body 5 is switched to the lowered state, the valve body 5 is pushed down to the maximum, and then the rotating teeth 14 of the rotating cam 13 and the locking teeth 16b of the upper gear 16 are engaged. It rises by the height H up to the meshing height position. However, in the present invention, the packing 7 includes a flexible fin portion 8, and the fin portion 8 is elastically deformed to absorb the height H, and the valve body 5 maintains the closed state of the drain port 1. can do.
Further, even when the upper surface of the fin portion 8 and the contact surface 9 of the valve body 5 come into contact with each other during the elastic deformation, a protrusion 25 is formed on the contact surface 9 as a sticking prevention mechanism. Therefore, it is possible to prevent the fin portion 8 from being stuck to the contact surface 9. Even if a push operation is applied to the valve body 5 in a state where hot water is stored in the tank body B, there is a slight gap between the upper surface of the fin portion 8 and the contact surface 9 due to the protrusion 25. Therefore, hot water or the like that has entered between the upper surface of the fin portion 8 and the contact surface 9 is discharged from the gap, or air flows from the gap, and a vacuum state due to surface tension does not occur. . Further, since the outer end of the protruding portion 25 is disposed outside the outer diameter of the packing 7, it is possible to always form a gap with the contact surface 9 when the fin portion 8 is elastically deformed. At the same time, it is possible to prevent the elastically deformed fin portion 8 and the protrusion 25 from being caught.

  The third embodiment of the present invention will be described below. In the third embodiment described below, only the valve body 5 and the packing 7 are different from those in the first embodiment, and the other members are denoted by the same numbers as those in the first embodiment. The description is omitted.

  As shown in FIG. 13, the valve body 5 is a lid member in which a packing 7 is fitted around and the upper end of a thrust lock mechanism 10 as a lock mechanism is attached to the back surface. When the packing 7 is in close contact, the drain port 1 is closed watertight.

  The packing 7 is substantially L-shaped in cross-section, and includes a cylindrical portion 30 fitted on the outer periphery of the valve body 5 and a thin fin portion 8 extending outward from the lower end of the cylindrical portion 30. The fin portion 8 is configured to be flexible enough to be deformed when it comes into contact with the drain plug 2. In this embodiment, the outer peripheral surface of the cylindrical portion 30 is a contact surface 9 that contacts when the fin portion 8 is elastically deformed, and a protrusion 25 as a sticking prevention mechanism is formed on the contact surface 9. ing. The protrusions 25 are protrusions formed at three positions on the contact surface 9 every 120 degrees, and extend in the axial direction (vertical direction) of the contact surface 9.

  When the packing 7 of the third embodiment comes into contact with the drain plug 2 due to a pushing operation applied to the valve body 5, the fin portion 8 warps upward, and the upper surface of the fin portion 8 is the packing. 7 abuts against the abutment surface 9. However, since the protrusion portion 25 as a sticking prevention mechanism is formed on the contact surface 9, a slight gap is formed between the upper surface of the fin portion 8 and the contact surface 9 of the packing 7, and the vacuum state do not become.

Although the third embodiment is as described above, the invention of the present application is not limited to the shape of each of the embodiments described above, and it is possible to make design changes and the like as appropriate without departing from the gist of the invention.
For example, in each of the embodiments described above, the sticking prevention mechanism is a protrusion or groove formed on a ridge, but the sticking prevention mechanism may be composed of one or more protrusions, and one or more. It may be comprised from the recessed part. Further, it may be configured by forming irregularities, steps, texture, a wavy surface, and the like.
Further, the sticking prevention mechanism is formed on the contact surface 9 with which the fin portion 8 abuts, but may be formed on the fin portion 8 side, or may be formed on both the contact surface 9 and the fin portion 8. May be.
Further, the sticking prevention mechanism is not necessarily formed in the valve body 5 or the packing 7, and another member having a sticking prevention mechanism may be disposed between the valve body 5 and the packing 7.

  In each of the above embodiments, the lock mechanism is the thrust lock mechanism 10, but instead of the thrust lock mechanism 10, a one-way cam or other known lock mechanism described in Patent Document 1 may be used. . Further, the water stop structure of the present invention does not necessarily need to be provided with a lock mechanism, and may be employed for a rubber plug or the like not provided with a lock mechanism.

  Moreover, in each said embodiment, although the drainage tool was the valve body 5, as shown in FIG. 14, the water stop for blocking | closing the drain outlet of tank bodies, such as a kitchen sink, and storing hot water in the tank body. The lid 35 may be a drainage tool, and other members may be drainage tools.

1 Drainage port 1 \
2 Drainage plug 3 Connection pipe 5 Valve body 6 Groove part 7 Packing 8 Fin part 9 Contact surface 10 Thrust lock mechanism 11 Casing 12 Lock shaft 13 Rotating cam 14 Rotating tooth 15 Fixed cam 16 Upper gear 16a Inclined tooth 16b Locking tooth 17 Lower part Gear 17a Inclined tooth 18 Cam groove 19 Spring 20 Lower member 21 Eye plate 25 Projection part 30 Tubular part 35 Water stop lid B Tank body

Claims (7)

Drainage tools,
In the water stop structure equipped with a packing that is attached to the drainage and performs watertightness with other members,
The packing has an elastic fin part,
A water stop structure comprising a sticking prevention mechanism for preventing the fin portion from sticking to a drainage device or packing itself. The drainage device or packing includes a contact surface that contacts the deformed fin portion,
The water stop structure according to claim 1, wherein the sticking prevention mechanism is formed on the contact surface. The water stop structure according to claim 1, wherein the sticking prevention mechanism is a groove. The water stop structure according to any one of claims 1 to 3, wherein the sticking prevention mechanism is a protrusion. The sticking prevention mechanism is
The water stop structure according to any one of claims 1 to 4, wherein the water stop structure is provided in a drainage device. The sticking prevention mechanism is
The water stop structure according to any one of claims 1 to 5, wherein the water stop structure is provided in a packing. The drainage device is a valve body for opening and closing the drainage port of the tank body,
The said valve body is provided with the locking mechanism which switches a raising state and a descending state of a valve body, whenever a pushing operation is added to a valve body, The one of Claim 1 thru | or 6 characterized by the above-mentioned. Water stop structure.

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