JPH09328769A - Packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To follow the vertical movement of a lid main body to deform elastically so as to improve sealability of the lid main body and a frame body by forming a packing main body into a shape which is long longitudinally and forming a cavity in the inside thereof. SOLUTION: A packing main body 10 is constituted in such a manner that a pair of adhesion parts 14, 14' which protrude upward are connected in an upper end part 14a thereof and are integrated and that a cavity part 12 which is long longitudinally and has an elliptical shape is formed between the adhesion parts 14 and 14'. Furthermore, the pair of adhesion parts 14, 14' are formed in such a manner that their wall thickness is gradually reduced toward the upper end part 14a. Moreover, the adhesion parts 14, 14' protrude in the vertical direction in such a manner that they are sufficiently longer than a clearance between a packing seat 9 of a lid main body 3 and a lower face 2b of a frame body 2 which is caused when the lid main body 3 is fitted in the frame body 2. The packing main body 10 is formed by a material which can be deformed elastically and adheres to the packing seat 9 to prevent the passing of fluid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing used for a manhole cover, a water tank cover, etc. installed to close an opening communicating with an underground space or the like.

[0002]

2. Description of the Related Art Conventionally, a manhole cover is provided to close an opening on the ground surface that communicates with an underground space for installing electric wires, gas pipes, sewers and the like. Such a manhole cover is, for example, as shown in FIG.
Is provided with a tapered fitting surface 22 and the inner peripheral edge of the frame 23
A tapered support surface 24 is provided on 23a, and when the fitting surface 22 and the support surface 24 contact each other, the lid main body 21 is supported by the frame body 23 and the inflow of rainwater and the like is reduced. Further, in order to improve the sealing performance of the lid main body 21, packing 26 is embedded inside the supporting surface 24 as shown in the same figure, or, as shown by a two-dot chain line in the same figure, a frame 23 Bottom
A packing 26 having a pipe-shaped cross section is embedded in 23b.

The lid body 21 is supported by the frame body 23 by fitting the fitting surface 22 of the lid body 21 to the support surface 24 of the frame body 23. Moreover, the packing 26 prevents water from entering between the underground passage and the ground. The passage of fluids such as odor and odor is blocked.

[0004]

However, in the packing 26 provided on the support surface 24, when the lid main body 21 is opened and closed, the packing 26 is twisted by the fitting surface 22 of the lid main body 21 and the frame 23 There was a problem that you might leave. On the other hand, in the packing 26 having a pipe-shaped cross section provided on the lower surface 23b, the lid body 21 rattles and moves up and down, and
If it is not fitted and supported horizontally on 23, there is a problem that a part of the lid main body 21 is separated from the packing 26 and the hermeticity cannot be maintained.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a packing capable of reliably blocking the passage of a fluid by closely adhering to the lid body regardless of rattling of the lid body. The challenge is to provide.

[0006]

Means for Solving the Problems The present invention has been made to solve the above problems, and means for solving the problems are attached to the frame body 2 and fitted to the frame body 2. Packing body 10 that can be elastically deformed and adhere to the lid body 3
In the packing having the above, the packing main body 10 is formed in a vertically long shape, and the hollow portion 12 is formed inside.

In the packing having the above-mentioned constitutional means, the packing main body 10 is formed in a vertically long shape, and the cavity portion 12 is provided therein.
As a result, the packing main body 10 has a large amount of elastic deformation in the vertical direction (vertical direction). Therefore, the packing body 10 is elastically deformed following the vertical movement of the lid body 3 fitted to the frame body 2 and even if the lid body 3 is inclined with respect to the frame body 2, the packing body 10 and the frame body 2 are inclined. It is possible to keep the sealability with.

Further, as described in claim 2, if the hollow portion 12 is formed in a vertically elongated elliptical shape, even if the fitted lid body 3 is tilted and moved up and down, the hollow portion 12 is formed. Of the packing main body 10 and the elastic force of the packing main body 10 work together to restore the original vertical elliptical shape.
Does not follow the vertical movement of the lid body 3 and separate from each other. In addition, when the lid body 3 is fitted, the packing body
Since the vertical elliptical hollow portion 12 is deformed into a substantially circular shape, the force from above is not concentrated on one point of the packing main body 10 but is dispersed over the whole, so that the packing can be evenly packed. The body 10 will be deformed.

In addition, as described in claim 3, if the packing main body 10 is formed so as to become thinner toward the upper side, the lower side of the packing main body 10 becomes thicker than the upper side. The packing body 10 is easily elastically deformed on the upper side and hard to be deformed on the lower side.
Will be stably attached to the frame body 2 in a stable state.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a packing according to the present invention will be described below with reference to the drawings. FIG.
~ In Fig. 3, 1 is a frame body 2 that is buried around an opening 5 on the ground surface that communicates with an underground space formed under a road or the like.
2 shows a manhole cover including a cover body 3 fitted and supported by the frame body 2 and a packing body 10.

More specifically, on the inner peripheral edge 2a of the frame body 2, there is provided a tapered support surface 6 which is formed so as to gradually expand toward the upper side, and the outer peripheral edge 3a of the lid body 3 is provided. Is provided with a tapered fitting surface 7 that can be fitted to the supporting surface 6, and the fitting surface 7 of the lid body 3 abuts on the supporting surface 6, whereby the lid body 3 is The frame 2 is fitted and supported at a predetermined position.

Further, a concave packing mounting portion 8 is provided around the inside of the frame 2 below the supporting surface 6. Further, a packing seat 9 to which a packing body 10 described later can closely adhere is provided around the lower surface 2b of the lid body 3 near the fitting surface 7. The lid body 3 is provided with a burl insertion opening 17 for inserting the burl 16.

As shown by the chain double-dashed line in FIG. 2 and in FIG. 3, reference numeral 10 denotes a vertically long packing main body, and a pair of closely contacting portions 14 and 14 'projecting upwardly has an upper end 14a thereof. Are joined and integrated with each other, and a vertically elongated elliptical cavity portion 12 is formed between the close contact portions 14 and 14 '. further,
The pair of contact portions 14 and 14 'are formed to be gradually thinner toward the upper end portion 14a. In addition, the close contact parts 14, 1
4'is a lid body generated when the lid body 3 is fitted to the frame body 2.
It is protruded in the vertical direction sufficiently longer than the gap between the packing seat 9 of 3 and the lower surface 2b of the frame body 2.

As described above, in the packing body 10, the pair of close contact portions 14 and 14 'are gradually thinned toward the upper side, and the cavity 12 formed in the pair of close contact portions 14 and 14' is formed. Since it has a vertically elongated elliptical shape, it is inevitable
14, the outer surface of which is curved inward, and the other contact portion 14 '
Has a shape in which its outer surface is curved outward.

The packing body 10 is made of a material which is elastically deformable and which is in close contact with the packing seat 9 to prevent passage of fluid, for example, a material such as rubber which generally has a function as a packing. ing. A packing is formed below the packing body 10 by providing a convex mounting portion 15 to be fitted into the packing mounting portion 8 of the frame 2 for mounting.

In the packing having the above structure, since the packing body 10 is formed in a vertically long shape, the amount of elastic deformation in the vertical direction (longitudinal direction) becomes large. In addition, the cavity 12
The shape of the lid is a vertically elongated ellipse, so the lid body
When 3 is fitted, the force from above applied to the close contact parts 14 and 14 'is dispersed without being concentrated at one point and the hollow part 12 is deformed into a substantially circular shape. The deformation of the packing increases the durability of the packing.

In addition, the pair of contact portions 14, 14 'have an upper end portion 14a.
, The one contact portion 14 always urges the other contact portion 14 ', so that as shown in FIG. 2, the cavity 12 is deformed into a substantially circular shape, The upper side of the pair of close contact portions 14 and 14 ′ centering on the upper end portion 14 a is in sufficient close contact with the packing seat 9 of the lid body 3.

Therefore, even when the lid body 3 is tilted, the portion where the lid body 3 is raised is repulsed upward as shown in FIG. 4 in which the cavity 12 returns to its original elliptical shape. The packing body 10 returns to its original shape due to the force and the elastic force of the contact portions 14, 14 'made of an elastic body such as rubber.
The upper side of 4'is not separated from the packing seat 9 of the lid body 3. On the other hand, at the position where the lid main body 3 is lowered, the pair of contact portions 14, 14 'are further deformed against the elastic force, and the hollow portion 12 is deformed into the oblong elliptical shape. In this way, the packing main body 10 is elastically deformed by reliably following the vertical movement of the lid main body 3, so that the sealing performance of the manhole cover and the like can be maintained.

Further, the contact portions 14, 14 'of the packing body 10 are
Since it is gradually thinned as it goes up,
The upper side of the close contact parts 14 and 14 'is easily deformed, and on the contrary, the lower side of the close contact parts 14 and 14' is difficult to be deformed.Therefore, contact the lower surface 2b of the frame body 2 in a stable state. Becomes

For example, even when the lid body 3 is slanted at the time of opening and closing, as shown in FIG. 5, thin contact portions 14, 14 '
Since the upper side of the packing body 10 elastically deforms to the left and right (horizontal direction) and absorbs the load following the lid body 3, the lower side of the packing body 10 is difficult to deform, and the packing is twisted when opening and closing as in the past. Moreover, it does not come off from the frame 2.

In the above embodiment, the packing main body
The shape of 10 is a shape in which a vertically elongated elliptical cavity portion 12 is formed between a pair of close contact portions 14 and 14 ′ protruding upward, but the packing main body 10 is not necessarily the same as that of the above embodiment. There is no limitation, and for example, as shown in FIG.
The packing main body 10 may have a shape in which a bump-shaped contact portion 16 is bulged above the upper end portion 14a of 14, 14 '. According to such a packing body 10, the abutting portion 16 makes close contact with the packing seat 9 of the lid body 3, and as described in the above embodiment, the elastic force of the hollow portion 12 and the close contact portions 14 and 14 ′ causes the lid to cover. Follows the vertical and horizontal movements of the main unit 3.

Further, as shown in FIG.
The tongue-shaped abutting portion 16 that can come into close contact with the packing seat 9 is provided by extending the intimate contact portions 14 and 14 'from the upper end portion 14a of the 14,14' to the inward upper side and the outward upward side, respectively. It may be the packing body 10 having a given shape.

According to the packing main body 10 as described above, not only the packing main body 10 follows the movement of the lid main body 3 in the vertical and horizontal directions, but also the upper surface 16a side of the contact portion 16 is in close contact with the packing seat 9 of the lid main body 3. The contact area is wider than that in the above-described embodiment, and in particular, as the inner water pressure rises, the contact portion 16 extending inward and upward is pressed toward the packing seat 9 of the lid body 3 to prevent flooding. There is an advantage that it is possible to reliably prevent backflow of odors and sewage from the underground space inside the manhole. In addition, as shown in FIG. 3C, the packing main body 10 has a tongue-shaped contact portion 16 in which the contact portion 14 extends outward from the upper ends 14a of the contact portions 14 and 14 '. Even if there is, the same effect can be obtained.

Further, as shown in FIG.
The packing main body 10 may have a shape in which the abutting portion 16 in which the second hollow portion 17 is formed is provided in the upper end portion 14a of the 4,14 '. According to the packing main body 10, since the second hollow portion 17 and the hollow portion 12 are provided on the upper and lower sides, the packing main body 10 provided with one hollow portion 12 as in the above embodiment.
Compared with the above, there is an advantage that the repulsive force of the cavity becomes stronger and the packing main body 10 easily returns to the original shape.

In addition, as shown in FIG.
The packing body 10 in which two second hollow portions 17 and 17 are provided in parallel by partitioning 12 by the support portions 18 and 18 may be used. According to such packing body 10, in addition to the repulsive force of the hollow portion, the close contact portion 1
There is an advantage that the packing body 10 is likely to return to its original shape due to the elastic force of the supporting portion 18 acting from the inside of 4,14 '. As described above, the packing main body 10 may have various shapes, but it is essential that the packing main body 10 is formed in a vertically long shape and at least one cavity 12 is provided therein.

Further, in the above embodiment, the hollow portion 12
Is formed in a vertically elongated elliptical shape, but is not necessarily a hollow
12 is not limited to the vertically elongated elliptical shape, and may have a substantially triangular shape as shown in FIG. 6B, or a substantially circular shape as the second hollow portion 17 in FIG. 6D. The shape may be rectangular or the like. However, if the shape of the hollow portion 12 has a corner, the force applied to the close contact portions 14 and 14 ′ when the lid body 3 is fitted tends to concentrate on the corner and deteriorate from that portion. Since it is considered that there is some, it is considered preferable to form the corners slightly rounded when forming in a triangular shape or the like.

Further, in the above embodiment, the packing 10
Although the mounting portion 15 is formed in a convex shape, the mounting portion 15 is not necessarily limited to a convex shape, and is formed in a concave shape that can be held by the convex packing attachment portion 8 as shown in FIG. May be.

Further, in the above embodiment, the lid body 3
Is fitted and supported on the frame body 2 by contacting the tapered fitting surface 7 of the lid body 3 with the tapered support surface 6 of the frame body 2, but the lid body 3 is not always supported by such means. Body 2
The present invention is not limited to the case where the lid main body 3 is placed on and supported by a horizontal support surface 6 formed on the inner lower surface of the frame body 2 as shown in FIG. Good.
It is considered that the lid main body 3 is likely to be displaced in the horizontal direction due to the passage of an automobile or the like, but the packing according to the present invention is easily elastically deformed, so that the adhesion is maintained.

[0029]

As described above, since the packing according to the present invention is formed in a vertically long shape and has a hollow portion formed inside, the amount of elastic deformation in the vertical direction becomes large. Therefore, the lid body is elastically deformed by following the vertical movement of the lid body, and the sealing property between the lid body and the frame body can be maintained even if the lid body is inclined with respect to the frame body.

Particularly, when the hollow portion is formed in a vertically elongated elliptical shape as in the means described in claim 2, the force applied to the packing main body is dispersed without being concentrated at one point, and the packing is thus packed. The main body can use elastic force almost all over,
The lid body is more surely brought into close contact with the lid body to maintain hermeticity.

According to the third aspect of the invention, even when the lid body is tilted and displaced when the lid body is opened or closed, or is moved horizontally, only the upper side of the packing body is elastically deformed. By absorbing the force applied in the horizontal direction,
It does not cause the trouble that the packing is twisted and comes off the frame unlike the conventional case.

[Brief description of drawings]

FIG. 1 is a partially omitted sectional view showing an embodiment of a packing according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a partially omitted cross-sectional view showing a state in which the lid body shown in FIG. 1 is removed.

FIG. 4 is a partially omitted sectional view showing a state of the packing body when the lid body is tilted.

FIG. 5 is a partially omitted cross-sectional view showing a state of the packing body when the lid body is displaced.

6A to 6E are end views showing another embodiment of the packing according to the present invention.

FIG. 7 is a partially omitted cross-sectional view showing another embodiment of the packing according to the present invention.

FIG. 8 is a partially omitted sectional view showing a packing such as a conventional manhole.

[Explanation of symbols]

 2 ... frame, 3 ... lid body, 10 ... packing body, 12 ... cavity

Claims (3)

[Claims] 1. A frame (2) attached to and attached to a frame (2)
In a packing having a packing body (10) which can be elastically deformed and closely adhered to the lid body (3) fitted to, the packing body (10) is formed in a vertically long shape and has a cavity ( 12)
A packing characterized by being formed. 2. The packing according to claim 1, wherein the hollow portion (12) has a vertically elongated elliptical shape. 3. The packing according to claim 1, wherein the packing main body (10) is formed so as to become thinner as it goes upward.