JP3005623U - Manhole cover - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to obtain a manhole cover that is highly waterproof, sandproof, and dustproof, easy to open and close, and has an unprocessed receiving frame 1. [Structure] A rubber packing fitting groove 3 is provided in the middle of the outer peripheral side surface 2 "of the lid 2 which is detachably fitted to the receiving frame 1 in parallel with the outer peripheral side surface 2" of the lid, and is fitted into the fitting groove 3. The annular rubber strip plate 4 thus formed has an inner peripheral surface on which an uneven line 5 parallel to the lid upper surface 2 ',
5'is formed in a large number, and a protruding strip 6 having a tongue-shaped vertical cross section is provided on the outer peripheral surface of the rubber strip 4 substantially parallel to the upper surface 2'of the lid. Larger than the circumference,
Moreover, the outer peripheral edge 6a of the protruding strip 6 is substantially horizontal with respect to the receiving frame inner peripheral surface 1 ', and the lower surface thereof is inclined upward toward the outside,
In addition, the rubber packing 7 is thinly formed toward the outer peripheral edge 6a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This proposal concerns a manhole cover.

[0002]

[Prior art]

 Conventionally, the lid is detachably fitted to the receiving frame of the manhole without rattling.Therefore, the inner peripheral surface of the receiving frame and the outer peripheral surface of the iron lid are machined by precision machined taper surfaces, It was necessary to provide a slight gap.

Therefore, as shown in FIG. 3, a rubber packing fitting groove is formed on the outer peripheral side surface of the lid, a hollow cord-shaped rubber packing is fitted into this groove, and the outer peripheral side surface of the packing is slightly projected in an arc shape, Techniques have been developed for crimping the protrusion to the inner peripheral surface of the receiving frame.

However, if the pressure bonding is too strong, the opening and closing of the iron lid will be hindered, and if the pressure bonding is weak, not only the waterproof, sandproof or dustproof effect will be deteriorated, but also the precision equipment of the inner peripheral surface of the receiving frame and the outer peripheral surface of the iron lid. Processing was required.

[0005]

[Problems to be solved by the device]

 The purpose of the present invention is to obtain a manhole cover that is completely or sufficiently waterproof, sandproof or dustproof, easy to open and close, and easy to process.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, a rubber packing fitting groove is provided in parallel with the outer peripheral surface of the lid in the middle of the outer peripheral surface of the lid which is detachably fitted to the receiving frame, and is fitted in the fitting groove. A large number of concavo-convex strips parallel to the lid top surface are formed on the inner peripheral surface of the annular rubber strip, and a tongue-shaped projection strip with a vertical cross section that is substantially parallel to the lid top surface is provided on the outer peripheral surface of the rubber strip plate. The outer peripheral diameter of the strip is larger than the inner peripheral diameter of the receiving frame, the outer peripheral edge of the projecting strip is substantially horizontal with respect to the inner peripheral surface of the receiving frame, and the lower surface thereof is inclined upward toward the outside. And a manhole cover having a rubber packing thinly formed toward the outer peripheral edge. The manhole cover according to the above invention, in which the outer peripheral edge of the rubber packing has a tongue-shaped vertical cross section. The manhole cover according to the first or second invention, wherein the upper surface of the protrusion is upward Manhole cover described in each of the above-mentioned first, second or third invention which is a warped arc surface. Description is given in each of the above-mentioned first to fourth inventions in which a plurality of the above-mentioned protrusions are provided at intervals in the vertical direction. Composed of a manhole cover.

[0007]

[Action]

 In this proposal, the receiving frame is fixed to the inner circumference of the manhole opening to the floor or the road surface, and the outer peripheral surface of the lid is fitted along the inner peripheral surface of the receiving frame.

At the time of the above fitting, the outer peripheral edge of the rubber packing tongue-shaped projection provided on the outer periphery of the lid is pressed against the inner peripheral surface of the receiving frame to bend upward, and in that state, the lid is fitted to the receiving frame. .

Further, when the lid is fitted into the receiving frame downwardly, the outer peripheral edge of the rubber packing tongue-shaped ridges descends to the inner peripheral surface of the receiving frame in a crimped state, and outside the rubber packing fitting groove provided on the outer peripheral side surface of the lid. The ridges and grooves on the inner peripheral surface of the rubber packing on the peripheral surface are crimped by the elasticity of the rubber packing belt, and the ridges of the ridges and stripes increase the frictional force due to the elastic and crimping force of the rubber. There is no detachment due to vertical deformation of the strip or opening / closing of the lid.

Water, sand, dust, etc. entering through the gap between the lid and the receiving frame should be collected on the upper surface of the upwardly curved rubber packing tongue-shaped projections and fall into the manhole along the inner peripheral surface of the receiving frame. There is no. Furthermore, the water leaking from the first-stage tongue-shaped protrusions through the rubber packing can be sufficiently waterproofed by the second-stage tongue-shaped protrusions.

Further, even if the lid is eclipsed by the wheel of the automobile and horizontally moved in the inner peripheral surface of the receiving frame, the outer peripheral edge of the tongue-shaped projection is brought into pressure contact with the inner peripheral surface of the receiving frame due to the return of the rubber packing elastic force. It is not detached from it and the close contact state is always maintained.

[0012]

【Example】

 The receiving frame 1 is fixed to the upper end of the manhole 9 opening to the floor surface or the road surface 8, and the inner peripheral surface 1'is a steep taper surface as shown in FIG. 1 or 3.

A tapered outer peripheral side surface 2 ″ of a lid 2 faces the inner peripheral surface 1 ′ of the receiving frame, and the receiving frame 1 is closed by a lid 2. The middle of the outer peripheral surface of the lid 2 covers the entire circumference. The rubber packing fitting groove 3 is formed relatively wide in the vertical direction and substantially parallel to the outer peripheral side surface 2 ″ of the lid 2. The receiving frame 1 and the lid 2 are made of iron (cast or forged) or hardened synthetic resin (mold).

Between the upper and lower step surfaces 3 ′ and 3 ′ of the fitting groove 3, a ring-shaped rubber strip plate 4 having a width substantially equal to the vertical width of the groove 3 is attached to the inner surface of the groove 3 by its elasticity. Crimp. On the inner peripheral surface of the strip-shaped plate 4, a large number of concavo-convex stripes 5 and 5'which are substantially parallel to the lid upper surface 2'are formed over the entire circumference.

The uneven lines 5, 5 ′ may be a zigzag uneven line, a corrugated uneven line, or a U-shaped uneven line, and are formed over the entire width of the strip plate 4 in the vertical direction. It may be partial at the top and bottom of the width.

On the outer peripheral surface of the strip-shaped plate 4, a plurality of protruding strips 6 are provided in an endless manner in the direction parallel to the lid upper surface 2 ′ over the entire circumference. A vertical gap s is interposed between the plurality of protrusions 6, 6, and the outer diameter of the protrusions 6, 6 is larger than the inner diameter of the receiving frame 1 as shown by the phantom line in FIG.

The upper surface 6 ′ of the ridge 6 is substantially horizontal, and the lower surface 6 ″ is inclined outward in an arcuate shape and gradually increases from the base of the ridge 6 to the outer peripheral edge 6 a. The rubber packing 7 having a thin protrusion 6 and the strip plate 4 are integrally formed to have a protrusion 6 having a tongue-like vertical cross section.

The upper surface 6 ′ and the lower surface 6 ″ intersect with each other to make the outer peripheral edge 6 a sharp, and only the lower surface 6 ″ has an arc surface that slightly bulges downward, and the upper surface 6 ′ also has an arc that is slightly warped upward. By forming the surface, the outer peripheral edge 6a can be sharply pointed, so that the outer peripheral edge 6a can be flexibly pressed against the inner peripheral surface 1'of the receiving frame 1.

Reference numeral 10 in FIG. 2 denotes an embossed circular groove formed in the central portion of the upper surface of the lid, in which an embossed dial or the like is inserted and integrally cast. Also, 11 is a relief edge.

[0020]

[Effect of device]

 Since the present invention is configured as described above, the outer peripheral edge of the projecting strip having a tongue-shaped vertical cross section in which the above-mentioned rubber packing of the lid is crimped to the receiving frame and bent upward is better utilized by the rubber elastic force on the inner peripheral surface of the receiving frame. Since the linear pressure contact is made, it is not necessary to process the inner peripheral surface of the receiving frame, and only the surface of the casting material can be used. Moreover, the rubber packing is strongly supported in the above-mentioned fitting groove on the outer peripheral surface of the lid to prevent deformation or deformation. There is no risk of falling off from the lid, and the tongue-shaped protrusions in the first step provide waterproofness, sand-proofing, and dust-proofness. It has a sufficient waterproof effect and also has the effect of providing a manhole cover that is easy to open and close.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view taken along the line AA in FIG. 2, showing a part of a manhole cover and an iron receiving frame of the present invention.

FIG. 2 is an overall plan view of FIG.

FIG. 3 is a partially enlarged vertical sectional view of a conventional lid and receiving frame.

[Explanation of symbols]

 1 Receiving frame 2 Lid 2'Lid top surface 2 "Lid outer peripheral surface 3 Rubber packing fitting groove 4 Rubber strip plate 5, 5'Revenge strip 6 Tongue-shaped projection strip 6 'Tongue-shaped projection strip upper surface 6" Tongue-shaped projection strip lower surface 6a Tongue-shaped outer peripheral edge 7 Rubber packing s Vertical spacing

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[Procedure amendment]

[Submission date] July 19, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 5

[Correction method] Change

[Correction content]

Claims (5)

[Scope of utility model registration request] 1. A ring-shaped rubber band in which a rubber packing fitting groove is provided in the middle of the outer peripheral side of the lid to be detachably fitted to the receiving frame in parallel with the outer peripheral side surface of the lid, and is fitted in the fitting groove. A large number of concavo-convex stripes parallel to the top surface of the lid are formed on the inner peripheral surface of the plate, and a projection strip having a tongue-shaped vertical cross section that is substantially parallel to the top surface of the lid is provided on the outer peripheral surface of the rubber strip plate. Is larger than the inner peripheral diameter of the receiving frame, and the outer peripheral edge of the protruding line is substantially lateral to the inner peripheral surface of the receiving frame, and the lower surface thereof is inclined upward toward the outer side and toward the outer peripheral edge. Manhole cover with thin rubber packing. 2. The manhole cover according to claim 1, wherein an outer peripheral edge of the rubber packing has a tongue-shaped vertical cross section. 3. The manhole cover according to claim 1, wherein the lower surface of the protrusion is an arc surface that swells slightly. 4. The manhole cover according to claim 1, wherein the upper surface of the protrusion is an arc surface slightly warped upward. 5. The manhole cover according to claim 1, wherein a plurality of the protrusions are provided at intervals in the vertical direction.