JP2001172996A - Link hinge of underground embedding small shape manhole cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the link hinge of the protection cover of a drainage vinyl chloride small shape manhole from interfering with an inner cove an prevent a cover from slipping off. SOLUTION: The protection cover 2 of the drainage vinyl chloride small shape manhole is composed of the cover 4, a receiving frame 5 and the like, which are connected by the link hinge 1 to prevent slipping-off of the cover 4. The link hinge 1 is composed of a long size link 10 and a short size link guide frame 11, the base part of the link is supported by the brackets 14, 15 of the receiving frame, the guide frame 11 is hung down on the rear face of the cover 4 so as not to interfere with the inner cover. In addition, labyrinths 16, 16' are provided on the brackets 14, 15 ad since the base part of the link 10 is supported therethrough, the base part of the link 10 is difficult to slip off from the brackets 14, 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a link hinge of a small manhole cover for burying underground, and more particularly to a link hinge of a protective cover of a small plastic manhole for drainage.

[0002]

2. Description of the Related Art Generally, a manhole cover for sewage is JIS.
According to the standard (A5506), a hinge, a chain, or the like is provided to prevent the lid from deviating, and the lid is connected to the receiving frame.

The following first, second and third structures are known for link hinges for connecting the lid and the receiving frame, which are roughly classified from the viewpoint of the pivot position of the link hinge.

[0004] As a first hinge, a link hinge pivotally supported by a lid is configured as follows.

A pair of hinge brackets protrude from the back surface of the lid, and a pair of pivot pins provided on both sides of the base of the link are supported by the hinge bracket, and the link is suspended by its own weight. A stopper is protruded from the tip of the link.

On the other hand, a substantially U-shaped (U-shaped) is formed on the inner periphery of the receiving frame.
The link guide frame is provided so that the entire length of the link is guided so as to be freely inserted, and the link is stopped by a stopper provided at the end of the link. No. 141276, Shokai 6
4-31142, Japanese Utility Model Laid-Open No. 2-50440, etc.).

[0007] As a second hinge, the hinge pivotally supported by the receiving frame is configured as follows.

A pair of hinge brackets project from the inner periphery of the receiving frame, and a pivot pin for pivotally supporting the base of the link is inserted into the hinge bracket. A pivot stopper is provided at the tip of the link. Is protruding.

On the other hand, on the inner surface of the edge of the lid, a substantially vertically long link-shaped guide frame for a link is provided so as to be swingable, and the entire length of the link is guided so as to be freely inserted into the guide frame for the link. The structure is such that the stopper is provided at the distal end portion (see JP-A-8-10964).
No. 9, JP-A-8-326081).

As a third hinge, a hinge pivotally supported by the lid and the receiving frame is configured as follows.

The base and the tip of the center folding link are pivotally supported on the back surface of the lid and the inner periphery of the receiving frame, respectively (see Japanese Utility Model Publication No. 4-15803).

On the other hand, a small manhole made of vinyl chloride for sewage generally comprises an invert portion, a rising portion, an inner lid and a protective lid according to the Japan Sewerage Association Standard (JSWAS).

According to the standard, the protective lid has the same appearance as that of the JIS standard sewer manhole cover.

Accordingly, various proposals have been made for link hinges of the protective cover according to the JSWAS standard.

For example, proposals belonging to the first hinge are disclosed in JP-A-8-226137 and JP-A-10-37224.
A proposal belonging to the second hinge is introduced in Japanese Patent Application Laid-Open No. Hei 10-37223.

The latter proposal will be described. That is, when the first hinge is applied to a protective cover of a small-sized manhole made of vinyl chloride for sewerage (hereinafter, also simply referred to as a protective cover), a link hanging down by its own weight at the link hinge forms a PVC sealing a rising portion. The following proposal has been made with the problem that the protective lid itself needs to be enlarged so as not to contact the inner lid.

That is, a substantially U-shaped link guide frame is pivotally supported on the inner circumference of the reduced diameter of the receiving frame in a vertically rotatable manner, and a pair of hinge brackets is protrudingly provided on the back surface of the lid. A pin for pivotally supporting the base of the link is inserted into the hinge bracket, and a stopper that protrudes from both ends of the link is provided at the tip of the link, and a link that guides the link guide frame so that it can be inserted freely. In a type in which the guide hinge for the link hinge belonging to the first hinge is of the retaining type, a structure is proposed in which an engaging piece is provided at the base of the guide frame so that the link guide frame does not hang down.

[0018]

However, in such a proposed link hinge, the link guide frame is provided on the inner periphery of the receiving frame, the base of the link is provided on the back surface of the lid, and a simple pivot shaft (for example, the above-mentioned Japanese Patent Laid-Open No. Hei 8 (1996)). (Equivalent to a pivot shaft composed of a bolt and a nut used for a second hinge disclosed in Japanese Patent Application Laid-Open No. H09-64949 and Japanese Patent Application Laid-Open No. H8-326081). There is a risk.

Since the principle of leverage is generally used to open the lid using a bar, the opening force of the bar may be any force perpendicular to the pivot axis. Since the force often exerts an oblique force on the pivot shaft by the lever, an excessive force is applied to the pivot shaft.

That is, when the lid is pryed open by the bar, the link hinge assembled with the two pivots may be damaged.

Originally, the link is formed about twice as long as the link guide frame as shown in the above-mentioned publication, but if the proposed link is made long, the lid is closed. In this case, the tip of the link is still lowered, and if the protective lid sinks, the link and the inner lid interfere with each other. However, if the link is not long, the lid will not open greatly,
Opening and closing the inner lid is troublesome.

If the lid is connected to the receiving frame by the proposed link hinge, or if the lid is removed from the receiving frame and another lid is mounted, a special tool for disassembling and assembling the pivot shaft is required. The work becomes complicated.

Therefore, the link guide frame pivotally supported on the inner periphery of the receiving frame is provided with a pair of hinge brackets projecting from the inner periphery of the receiving frame, as disclosed in Japanese Utility Model Publication No. 4-150803. One of the brackets is provided with a notch-shaped mounting concave portion which is open at the top, and one of the pivot pins provided on both sides of the base of the link guide frame is elongated, and this pivot pin is fitted to the bracket. At times, a mechanism is considered that shifts the link in the pin axis direction, inserts the pivot pin, and then fits it, eliminating the need for tools.However, originally, a protective cover made of a small polyvinyl chloride manhole for sewerage is generally used. Smaller diameter than the sewer manhole cover (maximum 400 mmφ for the former, approx.
0 mmφ), and since the receiving frame is supported by the donut-shaped pedestal to avoid increasing the weight, the lifting becomes easier. If the pin is simply displaced in the axial direction by the length of the pivot pin, the link will immediately come off, especially if it is a painted casting lid, and there will be a gap between the links. Because of the deviation, such a mechanism cannot be adopted as it is.

SUMMARY OF THE INVENTION The present invention has as its main object to solve the problems of each link hinge of these general sewer manhole covers and plastic small manhole protective covers. It is another object of the present invention to prevent the pivot pin from deviating from the bracket without using the pivot pin, and to provide an asobi (play) to smoothly open and close the lid.

[0025]

In order to achieve the above object, the present invention comprises 1) a lid and a receiving frame for fitting and supporting the lid, and connecting these lids to the receiving frame; In a link hinge of a small underground manhole cover provided with a link hinge used for pivoting at the time of opening and closing of the lid, a pivot pin provided at a base of the link of the link hinge is provided on an inner periphery of the receiving frame. In order to be pivotally supported by the pair of hinge brackets provided, the bracket is fitted through a notched mounting recess provided in the bracket, through a pin guide maze, and into a pivot pin hole provided in the bracket. And 2) a lid and a receiving frame for supporting the lid by fitting the lid inside, and these lids and the receiving frame are connected by a link hinge. In the small manhole cover for underground burial,
The base of the long link of the link hinge is pivotally supported by a pair of hinge brackets provided on the inner periphery of the receiving frame, and the link is swingably hung on the back surface of the lid for a short link. A link hinge of a small manhole cover for underground burial inserted into a guide frame has long and short pivot pins protruding on both sides of the base of the link, and a notch-shaped mounting recess is provided on one of the brackets. Is formed so that a long pivot pin is placed thereon, and a pivot pin hole in which the pivot pin is pivotally supported by the bracket is provided separately from the recess described above, and the mounting recess and the pivot are provided. The support pin hole is communicated with a pin guide maze provided in the bracket, and the other side of the bracket is provided with a pin hole, a maze and a pivot pin at a position facing the recess, the maze and the pivot pin hole. The link will be broken while smoothing the pivot of the link. In the link hinge of the small manhole cover for underground burial characterized in that it is difficult to deviate from the socket, and 3) an asobi is provided by making the pivot pin hole larger than the diameter of the pivot pin. The link hinge of the small manhole cover for underground burying according to claim 1 or 2, and 4) the small manhole cover is a protective cover for a small plastic manhole for drainage. Or the link hinge of the small manhole cover for underground burying described in 3 above.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention,
2 is a plan view of a main part of FIG. 1, and FIG. 3 is a detailed view of a main part of FIG.
FIG. (3-1) is a view taken in the direction of arrow A in FIG. 1, and FIG.
-1) is a left side view of the section a to a in FIG.
1A is a right side view, FIG. 3D is a plan view of FIG. 3A, FIG. 4 is another main view of FIG. 1, and FIG. (4-2) is a plan view of (4-1), (4-3) is a side view of (4-1), and (4-4) is another A of FIG. FIG. 4 (4-5) is a view of FIG.
It is a side view of 4).

The link hinge 1 of this embodiment is made of spheroidal graphite cast iron (FCD600) and is applied to the protective cover 2 of a small plastic (manufactured PVC) manhole for sewage (drainage) roads. The protective lid 2 is used for a so-called public small manhole, and therefore conforms to the standards of the Japan Sewerage Association.

An outline of the protective cover 2 will be described. In FIGS. 1 and 2, a hard vinyl chloride small manhole for sewage in which the protective cover 2 is used is not shown in the drawings.
G, a rising portion, and a thick-walled disc-shaped inner cover made of polyvinyl chloride and a protection cover 2 whose upper ends of the rising portion (also referred to as an inspection tube) are closed and opened freely.
The protective cover 2 receives a road surface load instead of the inner lid having a closed rising portion.

In this specification, the term "small" refers to those substantially corresponding to or smaller than small vinyl chloride manholes.

Therefore, the protective cover 2 is removably mounted on the donut-shaped pedestal (not shown) made of a recycled plastic material set on earth and sand whose periphery is squeezed by the bayonet ears 8. .

The pedestal is externally fitted to the rising portion via a predetermined annular gap so that a road surface load does not act on the rising portion.

The appearance of the protective cover 2 conforms to the standard of a general manhole cover for sewerage.
And a short cylindrical receiving frame 5 in which the lid 4 is fitted and supported by a funnel taper. The lid 4 and the receiving frame 5 Is also made of painted cast iron (iron) and conforms to the above standards.

The cover 4 is provided with a ball hole 6 facing the link hinge 1 on the cover diameter. Therefore, the bar
The lever action of the bar 3 inserted into the hole 6 causes the lid 4 to open with the link hinge 1 side as a fulcrum. Since the manhole is sealed by the inner cover and there is no leakage of sewage gas, the valley hole 6 has an automatic closing lid 7 with a weight as shown in the drawing,
A not-shown lid with a claw (see Japanese Patent Application Laid-Open No. 10-195902), that is, a bur hole lid prevents only inflow of earth and sand.

Therefore, the link hinge 1 according to the embodiment of the present invention is applied to the protective cover 2 as described above, and exhibits the following features.

In the link hinge 1, the base of the U-shaped bent link (leg) 10 is pivotally supported on the inner periphery of the lower end of the reduced diameter portion of the receiving frame 5, and the link 10 guides the link 10 freely. Since the base of the character-shaped link guide frame 11 hangs on the back surface of the lid 4 swingably under its own weight, the link hinge 1 belongs to the second hinge and is relatively long (about 10 cm). Link 10 is suspended without hanging down, and is short (about 5 cm)
Of the link guide frame 11 hangs down by its own weight, so that the conventional hanging length is reduced by half, and
Even if it becomes a structure which greatly protrudes inward, it will be at a higher position than the inner lid provided in the rising part, will not interfere, and will exhibit the feature that there is no need to enlarge the protective lid 2 itself.

When the cover 2 is closed, the link 10 is not allowed to hang down at all. Therefore, even when the protective cover 2 is unexpectedly lowered, the link 10 may come into contact with the inner cover to damage the inner cover made of synthetic resin. In addition, there is a feature that the lid 2 can be opened and closed with confidence.

As a result, a feature is exhibited in which maintenance and inspection of the manhole can be easily performed by opening and closing the inner lid with a handle or the like.

Next, the link hinge 1 will be described in detail. FCD (or stainless steel such as SUS)
At the base of the link 10 of the link hinge 1, pivot pins 12, 13 of long, short dimensions and the same diameter, which are orthogonal to both sides, are integrally protruded, and these pivot pins 12, 13 are received in a receiving frame. 5 is pivotally supported by a pair of hinge brackets 14 and 15 integrally protruding from the inner circumference of the lower end of the reduced diameter portion.

The brackets 14 and 15 are provided with guide pin mazes 16 and 16 'for details of pivot pins, which will be described later.
Since the pivot 13 is pivotally supported, once the production plant or a specialist constructor has fitted the pivot pins 12, 13, the lid 2 is rotated vertically about the pivot pins 12, 13. The pivot pins 12 and 13 are not only used for opening and closing but also for opening and closing the lid 2 with the rod-shaped valley 3 in the pin axis direction C, that is, for opening and closing.
It becomes difficult to deviate from 4,15.

The brackets 14 and 15 are integrally connected to each other by a connecting rod 9 below the brackets 14 and 15 and are reinforced. And, instead of the link hinge 1, this connecting rod 9
And the long hole 23 described later may be connected by a chain (not shown).

Therefore, as shown in FIG. 3, the hinge bracket 14 on which the long pivot pin 12 is supported has a notch-shaped mounting recess 17 including a diagonally upper portion and a pivot pin hole 18. The mounting recess 17 and the pivot pin hole 18 are provided.
Are communicated through a maze 16 for guiding the pins.

On the other hand, the hinge bracket 15 on which the short pivot pin 13 is supported has a pin hole 17 ′ at a position facing the recess 17, the pivot pin hole 18 and the maze 16.
The pivot pin hole 18 'and the maze 16' are laterally recessed.

Therefore, the substantially cylindrical pivot pin hole 1
At 8, 18 ', a long and short round bar pivot pin 12,
Even if the lid 2 is opened and closed so that the lid 13 is displaced in the axial direction C, the pivot pins 12 and 13 cannot escape from the pivot pin holes 18 and 18 ′ directly above, and thus the lid 2 cannot be moved. Do not deviate from the connection of the link hinge 1.

In particular, the pivot pin holes 18, 18 'have a considerably larger diameter (10 mm) than the outer diameter (6 mm φ) of the pivot pins 12, 13.
φ), there is no frictional resistance in the pivotal rotation, and there is also an asobi (play).
13 to prevent rusting and torsion during opening and closing of the lid 2.
Can be smoothly opened and closed.

Asobi of the pivot pin holes 18 and 18 'can be formed by a structure in which the mounting recess 17 and the pivot pin hole 18 are separated. Of course, if they do not separate, the pivot pins 12, 13 are likely to always come off due to asobi.

The hinge brackets 14, 1
5, the thickness t (FIG. 3-1) of the bracket 14 supporting the long pivot pin 12 is larger than the thickness of the bracket 15 supporting the short pivot pin 13; Therefore, while supporting the long pivot pin 12, the link 10 is shifted in the pin axis direction C, and the short pivot pin 13 is moved.
Is inserted into the pivot pin hole 18 ', the base 19 of the link 10 is also supported.

Therefore, a pin insertion path 20 for inserting the pivot pin 12 from above as shown by an arrow B in FIG.
And a base side insertion path 21 into which the base side part 19 is inserted is formed in a vertical direction.

Of course, the hinge brackets 15 on which the short pivot pins 13 are supported are provided with such insertion paths 20, 21.
Is not formed, but a simple pin hole 18 'is formed in a recess. However, if the maze 6 is complicated, only the insertion path 20 may be formed in the bracket 15.

Next, a description will be given of the pivot pin maze 16 based on the hinge bracket 14 (the bracket 15 is also omitted for the same shape). As shown in FIG. 3, the path up to the pivot pin hole 18 is formed as a U-shaped path in a side view.

That is, after the pivot pin 12 slightly moves upward and outward from the mounting recess 17 (advance path), it descends vertically and returns slightly downward (return path). It is a path to reach.

Therefore, even if the pivot pins 12, 13 are slid in the axial direction C by opening and closing the lid in the pivot pin holes 18, 18 'and lifted (the opening of the lid is probably due to the lifting force of the lid), Because there are return paths and advance paths,
It does not come off from the pivot pin holes 18, 18 '. Therefore, it is very elaborately designed as a cover for theft prevention.

Therefore, the lid 2 does not deviate from the receiving frame 5 while the lid 2 is being opened and closed. Although troublesome, such inconvenience does not occur at all with this link hinge 1.

Of course, since the pivot pin maze 16 separates the mounting recess 17 and the pivot pin hole 18, the pivot pin 12 in the pivot pin hole 18 does not come off immediately. Any shape may be used, for example, the mounting recess 1
The shape may be a right-angled triangle with 7 as the apex and the pivot pin hole 18 as one point on the apex side of the base, or an arc shape.

Since the link hinge 1 is as described above, the method for attaching the link 10 to the hinge brackets 14 and 15 at a production factory or the like is as follows.

With the pivot pins 12, 13 of the link 10 down and shifted toward the bracket 14, the insertion paths 20, 21
Is inserted into the mounting recess 17. Next, the short pivot pin 13 is inserted into the pin hole 17 '. Next, while operating the link 10, the pivot pins 12, 13 are moved to the mazes 16, 1.
6 ′, and fit into the pivot pin holes 18, 18 ′.

Therefore, if such handling is known, a general lid can be replaced with, for example, a city emblem lid by operating the lid 4 and the link 10 without requiring a special tool.

Next, the link guide frame 11 will be described. In FIG. 1, FIG. (4-4), and FIG.
The link guide frame 11 is suspended by a bracket 22 provided on the back surface of the lid 4 with a length of about 6 cm so as to be swingable.

Therefore, even if the link guide frame 11 freely hangs under its own weight at any position, it can always satisfy the standard requiring a space of about 15 cm from the upper surface of the lid 4 to the inner lid. The link guide frame 11 has an upward U-shape, and the ends of two sides of the U-shape are hung down by a bracket 22, and the link 10 having a square cross-section is supported at the U-shaped connection side.

The bracket 22 is in the form of a single plate and is integrally provided on the rear surface of the lid 4 so as to project therefrom.
2, a horizontally elongated hole 23 is opened, and a pin 24 is inserted into the elongated hole 23, through which two ends of the link guide frame 11 are inserted.

Therefore, this pin 24 can slightly move the elongated hole 23 horizontally (having horizontal play).
Asobi are formed, and together with the pivot pins 12 and 13 of the link 10, rust of the pins and dents when opening and closing the lid 4 are absorbed,
Can be opened and closed smoothly, and 180 ° when lid 4 is opened
It is rotated so that it can be placed upside down on the ground (turning over).

The U-shaped two-side interval D is 14 mm, and the 10 mm square link 10 is slid loosely.
A long (about 11 mm) long pivot pin 12 and a short (about 6 mm) pivot pin 13 project from the base of the link 10 having this dimension.

The tip of the link 10 has a diameter of about 1 mm.
A sphere 25 of 6 mmφ is integrally provided to improve the contact with the back surface of the lid 4 and to make the link 1
0 does not come off.

Although the link hinge 1 of this embodiment has been described with reference to the link hinge 1 used for the protective cover of a small PVC manhole for drainage, the present invention is not limited to this, and the present invention is not limited to this. The present invention can also be applied to a link hinge of a small manhole cover for sewerage. Further, the manhole used in the present specification is a synonym for drainage, and includes drainage used in parks and the like.

[0065]

According to the first or second aspect of the present invention, since the link of the link hinge is pivotally supported by the bracket with the maze provided on the receiving frame, the link can be attached with difficulty without detaching without using a special tool. It is possible to prevent the lid from being stolen, as well as to prevent the lid from being detached and re-assembled.

According to the third or fourth aspect, even if an asobi is formed between the pivot pin and the pivot pin hole, since the pivot pin hole is separated from the mounting recess, the pivot pin is formed by the asobi. It does not come off and absorbs the opening and closing of the lid, and it can be opened and closed smoothly even with rust due to long-term burial.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a plan view of a main part of FIG.

FIG. 3 is a detailed view of a main part of FIG. 1;

FIG. 4 is another main view of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Link hinge, 2 ... Protective lid, 4 ... Lid, 5 ... Receiving frame, 10
... Link, 11 ... Link guide frame, 12,13 ... Pivot pin, 14,15 ... Bracket, 16 ... Maze, 17 ... Placement recess, 18 ... Pivot pin hole

Claims (4)

[Claims] 1. A ground having a lid and a receiving frame for fitting and supporting the lid therein, connecting the lid and the receiving frame, and providing a link hinge used for pivotal support when the lid is opened and closed. In a link hinge of a small manhole cover for middle burial, a bracket for pivotally supporting a pivot pin provided at a base of a link of the link hinge by a pair of hinge brackets provided on an inner periphery of the receiving frame. A link hinge for a small underground buried manhole cover, which is fitted through a notch mounting recess provided in the bracket through a pin guiding maze into a pivot pin hole provided in the bracket. 2. A small manhole cover for burying underground, comprising a lid and a receiving frame for fitting the lid inside and supporting the lid, wherein the lid and the receiving frame are connected by a link hinge. The base of the long link is pivotally supported by a pair of hinge brackets provided on the inner periphery of the receiving frame, and the link is pivotally hung on the back surface of the lid by a short link guide frame. At the link hinge of the small underground manhole cover inserted, long and short pivot pins are protruded on both sides of the base of the link, and a cutout mounting recess is formed on one of the brackets. The bracket is provided with a pivot pin hole on which the pivot pin is pivotally supported by the bracket. The pivot pin hole is provided separately from the mounting recess, and the mounting recess and the pivot pin hole are provided. And a pin guide maze provided on the bracket. By providing a pin hole, a maze and a pivot pin at a position facing the placing recess, the maze and the pivot pin hole, it is made difficult for the link to deviate from the bracket while smoothly supporting the link. The link hinge of the small manhole cover for underground burying. 3. The link hinge of a small underground buried manhole cover according to claim 1, wherein an asobi is provided by making the pivot pin hole larger than the diameter of the pivot pin. 4. The small manhole cover according to claim 2, wherein the small manhole cover is a protective cover for a small plastic manhole for drainage.
The link hinge of the small manhole cover for underground burial described in (1).