JP2892563B2 - Hinge structure of lid for underground structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinge structure for a cover for an underground structure, and more particularly to a hinge structure for a cover for an underground structure connecting a cover body and a receiving frame for fitting and supporting the cover body.

The term "cover for underground structures" as used in the present specification means a large iron cover, a manhole cover, or the like, which can openably close an opening through an underground buried object in a sewer, an underground structure facility, etc. and the ground. Sewage basin lid, openable and closable iron lid for power and telecommunications underground facilities and wiring, open and closed iron lid for power transmission, iron lid for power distribution, buried conduit under water surface in water supply and gas piping, and related equipment Fire hydrant lid, water control valve lid, and partition valve lid that function as an opening / closing door connecting the ground and the ground. General term for air valve lid, gas pipe lid, water meter lid, etc.

[0003]

2. Description of the Related Art Conventionally, manholes and small pits for management are provided on underground buried objects for sewerage, electric power / communication, and gas, and a receiving frame made of cast iron or the like is provided above these. And a lid for an underground structure, wherein the lid and the lid body are connected by a hinge.

As such a hinge structure, for example, Japanese Utility Model Laid-Open No.
Japanese Patent Publication No. -89853 discloses that opposing projections are provided on the lower surface of a manhole frame lid, and opposing projections are also provided on an inner lower part of a receiving frame. It describes that both ends of a connecting arm as a hinge are attached to a projection of a receiving frame.

[0005] With such a structure, the receiving frame and the lid main body can be connected so that the lid can be opened, and the lid main body can be prevented from being scattered by water pressure during abnormal flooding, and the lid main body can be prevented from being stolen. it can.

[0006]

However, in the above-mentioned hinge structure, the connection between the receiving frame and the base end of the hinge is performed by inserting a bolt through a projection of the receiving frame and a through hole provided in the base end of the hinge, and inserting a nut into the bolt. The connection between the lid body and the receiving frame using such bolts requires the use of tools such as a wrench with both hands, and it takes time to tighten the nuts. It was annoying. Further, the through hole for bolt insertion provided in the projection of the receiving frame and the through hole for bolt insertion at the base end of the hinge are both formed so as to have little play with the outer diameter of the bolt.
For this reason, it is difficult to arrange the through-hole provided in the projection of the receiving frame and the through-hole provided in the hinge base end in a straight line so that the bolt can be inserted, and this is a hindrance factor in the efficiency of the connection work. I have.

Such a problem is particularly remarkable when only the lid body is replaced after many years of use. First, when removing the lid body, both hands are required because a tool is used to loosen the nut. The nut may not rotate due to rust. In addition, when installing, inserting the connecting bolts into the small through holes formed in the receiving frame and hinges not only takes time, but also causes the connecting bolts and nuts to fall into the underground structure. Also.

The present invention has been devised in view of the above-mentioned problems, and does not hinder the function of the hinge itself for rotatably supporting the lid body, and also allows easy attachment and detachment of the hinge and the receiving frame. It is an object of the present invention to provide a hinge structure of a lid for an underground structure.

[0009]

In order to achieve the above object, the present invention provides a hinge structure for a cover for an underground structure, which connects a receiving frame and a lid body openably and closably attached to the receiving frame. A mounting seat having a through hole is provided at a base end of a hinge connecting the cover body and the lid body, and a receiving seat for rotatably supporting the hinge is formed on the inner peripheral surface of the receiving frame, and the receiving seats face each other. A pair of disposed support portions, and a mounting shaft formed between the pair of support portions and passing through the through hole of the hinge, and a part of the mounting shaft is cut out to insert the mounting seat of the hinge. A cutting section is provided, and a fixture for preventing detachment is detachably attached to the cutting section. In addition, the fixing tool has a pair of support portions disposed opposite to each other.
It has a width obtained by subtracting the width of the mounting seat from the distance between
It can be configured.

[0010]

In the hinge structure of the lid for underground structures according to the present invention, a through-hole formed in the mounting seat at the base end of the hinge is formed without using a bolt or nut for connection as in the prior art. The lid body can be attached to the receiving frame by disposing it at the cutting portion, further displacing the hinge in the axial direction of the mounting shaft from this state, and attaching a fixture to the cutting portion of the mounting shaft. When detaching, the fixing device may be detached, and the mounting seat of the hinge may be moved to the cut portion of the mounting shaft.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be specifically described below with reference to the embodiments shown in the drawings.

FIG. 1 is an exploded perspective view showing a hinge structure of a cover for an underground structure according to an embodiment of the present invention, with the hinge structure partially cut away. FIG. 2 is an assembled view of the hinge structure of the cover for an underground structure shown in FIG. FIG. 3 is a sectional view taken along line AA of the hinge structure of the lid for the underground structure shown in FIG. 2.

Reference numeral 1 denotes a receiving frame, and 2 denotes a lid body which is attached to the receiving frame 1 so as to be openable and closable. The receiving frame 1 and the lid main body 2 are connected by a hinge 3.

A part of the inner peripheral surface of the receiving frame 1 is cut out to form a hinge 3.
A receiving seat 4 for connection is formed. This seat 4 is a receiving frame 1
, A pair of support portions 5a extending downward from the flat receiving surface 1a,
5b are opposed to each other at a distance L, and the supporting portions 5a,
A mounting shaft 6 having a circular cross section is provided between 5b and a through hole 9a of the hinge 3, which will be described later . The mounting shaft 6
Is a length L1 attached to the facing surface side of the support portion 5a.
A major axis 6a and a support portion 5 on the axis of the major axis 6a.
and a short axis 6b having a length L2 attached to the opposite surface side of the second axis b. A cutting portion 6c having a width L3 is formed between the distal ends of the long axis 6a and the short axis 6b.

An engaging portion 8 for connecting the hinge 3 is erected on the rear surface edge of the lid main body 2 in the radial direction of the lid main body 2. Is formed with a long hole 8a in which the mounting portion 11 slides.

The hinge 3 is formed by pressing a steel plate made of stainless steel or the like. A mounting seat 9 provided with a through hole 9a having a diameter slightly larger than the mounting shaft 6 is provided at a base end thereof.
It is formed by bending into a shape. The width B of this mounting seat 9
Is slightly narrower than the width L3 of the cutting portion 6c of the mounting shaft 6 described above. The hinge body 10 includes a first linear portion 10 a having the same width as the mounting seat 9 connected to the mounting seat 9,
Intermediate portion 1 connecting to second linear portion 10c wider than 0a
0b, the second straight portion 10c is provided with an attachment portion 11 which is bent in an L-shape in the same direction as the attachment seat 9. The mounting portion 11 is formed with two bolt insertion holes 11a at the top and bottom. Reference numeral 12 denotes a U bolt inserted into the bolt insertion hole 11a.
Between the engaging portion 8 of the lid body 2 and the bolt through hole 11a.
And the U-bolt 12 through the long hole 8a,
3 is attached to the lid body 2 by screwing.

Reference numeral 15 denotes a fixture for preventing the hinge 3 from slipping out after the hinge 3 is attached to the receiving frame 1. A curved portion 15a having a substantially semicircular cross section and an elastically deformable hanging from both lower ends of the curved portion 15a. And a small holding piece 15b.
The inner diameter of the curved portion 15a is substantially the same as the outer diameter of the mounting shaft 6,
The width of the holding portion 15b is smaller than the diameter of the mounting shaft 6. The width W of the fixture 15 has a width obtained by subtracting the width B of the mounting seat 9 from the distance L between the support portions 5a and 5b.

Next, a method of attaching the hinge 3 having the above structure to the receiving frame 1 will be described.

In the hinge structure of the lid for an underground structure according to the present embodiment, the hinge 3 is connected to the receiving frame 1 with or without the hinge 3 attached to the lid main body 2. be able to.

First, the mounting seat 9 of the hinge 3 is inserted into the cut portion 6c of the mounting shaft 6, and the through hole 9a of the mounting seat 9 is arranged on the axis of the mounting shaft 6.
Is slid in the direction of the long axis 6a, and the mounting seat 9 of the hinge 3 is pressed against the support portion 5a. In this state, the fixture 1
5 is inserted between the supporting portion 5b and the mounting seat 9 from above.
As a result, the hinge 3 can be easily attached to the receiving frame 1 without the need to insert a bolt or the like into a small hole as in the related art. At this time, the holding piece 1 of the fixture 15
Since 5b is smaller than the diameter of the mounting shaft 6, it is elastically deformed by a pushing force from above and does not easily come off after being once mounted. Moreover, when removing the lid body 2 from the receiving frame 1, the fixing device 15 is moved upward to
Is moved in the axial direction of the mounting shaft 6, so that the fixture 15
Does not come off during use. In addition, a pair of support portions 5
a, the distance L between 5b is the same der because as the sum of the width W of the width B and the fixture 15 of the mounting seat 9, over a long period without even take Gras mounting hinges 3 by using Can be used stably.

Although the hinge structure of the lid for an underground structure according to the present invention has been described above, the present invention is not limited to the embodiment, but may be the following fixing tool.

As shown in FIG. 4, one of the fixtures 15 'has an opening having a width W and the other is tapered to form a substantially U-shape. On both sides, an opening 15c through which the mounting shaft 6 is inserted is formed. Have. When the fixing tool 15 'is mounted on the receiving seat 4, the opening side is narrowed with a hand or pliers or the like, and is arranged in the cutting portion 6c, and the mounting shaft 6 is inserted through the opening 15c.
Release 5 'and attach. In the case of removal, the reverse process may be performed.

In this embodiment, the case where the receiving frame 1 and the hinge 3 are connected has been described. However, a mounting shaft having a cut portion between the mounting portions of the hinge is formed, and the mounting shaft is attached to the back side of the lid body. if so formed was placed the long hole of the engagement portion for mounting the fixture to the cut portion, additional remark that cover the body and the butterfly numbers also can be attached with one <br/> touch Keep it.

[0024]

As described above, the hinge structure for a cover of an underground structure according to the present invention includes a mounting shaft formed between a pair of supporting portions and passing through a through hole of the hinge. The cutting portion is cut out to provide a cutting portion for inserting the hinge mounting seat, and a fixing tool is detachably attached to the cutting portion. As a result, the hinge can be easily attached and detached without inserting the bolt through the through hole as in the related art. Also, the width of the fixture should be
The width of the mounting seat minus the distance between the pair of support parts
The hinges attached can be
Stable use for a long time without rubbing
be able to.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a hinge structure of a cover for an underground structure according to an embodiment of the present invention, with a part of the hinge structure cut away.

FIG. 2 is a front view showing a hinge structure of the underground structure lid shown in FIG. 1 in an assembled state.

FIG. 3 is a view of the hinge structure AA of the lid for the underground structure shown in FIG. 2;
It is a line sectional view.

FIG. 4 is a perspective view of another embodiment of the fixture.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving frame 2 Lid main body 3 Hinge 4 Receiving seat 5a, 5b Supporting part 6 Mounting shaft 6a Long axis 6b Short axis 6c Cutting part 8 Engaging part 8a Long hole 9 Mounting seat 9a Through hole 10 Hinge body 10a First straight part 10b Intermediate portion 10c Second straight portion 11 Mounting portion 11a Bolt insertion hole 12 U bolt 13 Nut 15, 15 'Fixture 15a Curved portion 15b Clamping portion 15c Open hole

Claims (2)

(57) [Claims] 1. A hinge structure for a cover for an underground structure connecting a receiving frame and a lid body openably and closably attached to the receiving frame, wherein a through hole is formed in a base end of the hinge connecting the receiving frame and the lid body. And a receiving seat for rotatably supporting the hinge is formed on the inner peripheral surface of the receiving frame, and the receiving seat is provided between a pair of support portions disposed to face each other and the pair of support portions. A mounting shaft is formed to pass through the through hole of the hinge, and a part of the mounting shaft is cut out to provide a cutting part for inserting the mounting seat of the hinge, and further is detachably attached to the cutting part. A hinge structure for a lid for an underground structure, comprising a fixture for preventing the structure from falling off. 2. The fixing device is provided between a pair of supporting portions which are arranged opposite to each other.
Has a width obtained by subtracting the width of the mounting seat from the distance of
The hinge structure for an underground structure lid according to claim 1, wherein
Build.