JP2863463B2 - Locking device for manhole cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a manhole cover, and more particularly to a locking device for a protective iron cover of a PVC manhole.

[0002]

2. Description of the Related Art Conventionally, a manhole cover has been used for underground facilities such as water and sewage, electric power or gas, and also as an iron cover for protecting a PVC manhole cover. These manhole lids are provided with a locking device because accidental injury occurs if the manhole cover is opened and closed out of order.

[0003] By the way, various proposals have been made for this lock device, but in any case, the basic structure is a manhole cover with a valley hole, and a ring for fitting the cover, that is, a receiving frame. A swingable hook is provided on the back side of the manhole cover, and a hook engaging portion for hooking the hook is provided inside the receiving frame.
After inserting the ball into the ball hole and releasing the hook from the hook engaging portion, the manhole is pryed open.

[0004] In a general lock device, a man-ho
There is a problem that the odor in the manhole is released because the valley hole is opened in the lid, and a stopper for closing the valle hole is provided integrally with the hook, The ball hole is closed with this plug (for example, see Japanese Utility Model Application Laid-Open No. 61-10 / 1986).
No. 2651, Japanese Utility Model Laid-Open No. 1-75161, Japanese Utility Model Laid-Open No. 5-94347, etc.).

However, when such a general manhole cover locking device is applied to an iron cover locking device for protecting a PVC manhole, there are the following problems.

[0006] 1) In a general manhole cover, since there is a ball hole, the odor in the manhole is released, but in the ball hole of the protective iron cover, the inner cover of the PVC manhole is used. Since it is already sealed, there is no odor leakage. Therefore, there is no need for a plug that always closes the ball hole.

2) In a general ball hole, if the pressure inside the manhole rises, the manhole cover is blown off. -When acting on the cover, the manhole cover is opened slightly to release the internal pressure.However, since the protective iron cover protects the PVC manhole, do not receive the internal pressure of the manhole. Therefore, there is no possibility that the protective iron cover will blow away. Therefore, the manhole cover for the protective iron cover does not require a structure that opens slightly to release the internal pressure.

On the other hand, the plug for closing the burl hole shown in the above-mentioned publications is configured to be inserted into the burl hole, so that the surface of the manhole cover and the surface of the bung are not provided. However, there is a problem that if soil or the like is accumulated, it is difficult to determine the position of the bur hole and it is difficult to insert the tip of the bal.

In order to solve the above-mentioned problems, the present invention makes the lock device as simple as possible and makes it inexpensive, facilitates the handling of the bar, and makes the operation of the hook light. It is an object of the present invention to achieve a good lock function even if it is configured as described above.

[0010]

In order to achieve the above object, the present invention adopts the following gist. That is, the gist of the present invention is as follows: 1) a manhole cover with a ball hole, a receiving frame into which the cover is fitted, and a door frame disposed directly below the ball hole and swingable. A locking device for a manhole cover, comprising: a hook supported by a hook; and a hook engaging portion provided on the inside of the receiving frame, wherein the hook is disengaged, and the hook is provided downward. ,
A bottom plate substantially the same as or slightly larger than the area of the ball hole, a support shaft provided on both sides of the bottom plate, and swinging the hook;
An inner plate that is provided upright on the lid center side of the bottom plate, and a pair of side plates that support the support shaft and extend from the back surface of the lid across a valley hole. A lock device for a manhole cover, wherein a box having an upper surface opening is formed, the box serves as a closing portion of a ball hole, and the hook is constantly pressed toward a hook engaging portion. Further, 2) a notch is made so that the width of the inner plate (24A) of claim 1 is smaller than the width of the bottom plate (19), and the cutout is in contact with the inner end of the bottom plate (19) and the side plate (13). Both ends of the bottom plate (19) are formed by inclined surfaces (26) (19A) inclined downward, respectively, and
A lock device for a manhole cover, wherein the cover is a protection iron cover for an inner cover (6) for a PVC manhole.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to an embodiment shown in the accompanying drawings. 1 is an overall cross-sectional view of an embodiment of the present invention, FIG. 2 is a detailed modification of a main part of FIG. 1, FIG. 3 is a partially omitted view (rear view) of FIG. 5 is a perspective view of a main part of FIG. 2, FIG. 6 is a cross-sectional view of a main part (iron cover) of FIG. 2, FIG. 7 is a cross-sectional view of FIG. View (back view),
FIG. 9 is a plan view of a main part (receiving frame) of FIG. 2, and FIG. 10 is a sectional view corresponding to FIG. 2 showing a second embodiment of the present invention.

The lock device of this embodiment has a diameter of about 300 m.
Convenient for protection iron lid of mφ PVC manhole,
The material of the iron cover is cast iron (FCD600), the size is about 400 mm in diameter, and the height of the cast iron receiving frame is about 100 mm.
It has become. Of course, the present invention can be applied to a general manhole cover.

First, the iron cover 1 and the receiving frame 2 to which the lock device of the present embodiment is applied will be briefly described.

In FIG. 1, for example, a receiving frame 2 in a garage or on a road is installed concentrically around a PVC manhole 3.
Fixed. The iron cover 1 is closely fitted to the receiving frame 2 with a funnel surface having a slight taper and is covered.

The road surface side of the PVC manhole is a PVC inspection tube 4 standing upright on a PVC manhole body (not shown).
And a resin inner lid 6 provided in the upper opening with a seal material 5 interposed therebetween. Therefore, the inner cover 6 of the PVC manhole is surrounded by the receiving frame 2 and is covered by the iron cover 1 provided on the receiving frame 2. When inspecting the manhole, the tip side of the bar 8 is inserted into the ball hole 7 provided in the iron cover 1 and the iron cover 1 is opened with the hinge 9 as a pivot.

Incidentally, if the iron cover 1 is opened / closed and the inner cover 6 is also opened / closed, there is a danger of personal injury or the like. Therefore, the iron cover 1 is provided with the following lock device 10.

First, a related structure between the lock device 10 and the iron cover 1 will be described. In particular, in FIGS. 3, 6, 7 and 8, a U-shaped, for example, 50 mm × 23 mm small valley hole 7 is cut out on the anti-hinge side of the iron lid 1 in plan view. Have been. With this ball hole 7 interposed,
A pair of closing and hook supporting brackets 11, 11 are integrally extended downward on the back surface of the iron cover 1. The bracket 11 is symmetrical and only one of the brackets 11 will be described.

The bracket 11 comprises a prism 12 and a side plate 13 provided integrally with the prism 12 and flush with an end face of the prism 12. The inside of the notch 14 of the opening serves as a bearing of a support shaft 15 of the lock device 10 described later. An arc is formed at the back of the arm to facilitate swinging of the support shaft 15.
In addition, near the entrance of the notch 14, the prism 12
Is set up at the intersection 16 between the prism 12 and the notch 14,
A stopper 17 described later is adapted to be locked. In addition, the upper jaw of the notch 14 protrudes inside the prism 12,
The area of the side plate 13 is increased to form a sliding surface 18 with the side end of the lock device 10, and also serves as an insertion guide for the support shaft 15. Therefore, after the support shaft 15 of the lock device 10 is inserted into the back along the upper jaw of the notch 14, when the stopper 17 is clamped to the prism 12 and the intersection 16, the support shaft 15 does not fall out of the notch 14. Then, the bottom plate 19 and the inner plate 24 of the lock device 10 and a pair of the side plates 13, 1
3 together with a box having an upper surface opening, and this box is used as a closed portion of the ball hole 7.

Next, the lock device 10 of this embodiment and the receiving frame 2
The relation structure with will be described. In particular, FIGS. 2 and 9
, The receiving frame 2 is provided with a hook locking portion 21 for locking the hook 20 of the lock device 10. When the iron cover 1 is covered with the receiving frame 2, the hook locking portion 21 is located just below the valley hole 7 of the iron cover 1 and slightly below the center in the height direction of the receiving frame 2. The character frame 22 is formed integrally with the receiving frame 2. The connecting portion of the U-shaped frame 22 is formed to have a substantially square cross section, but the upper surface inside the U-shaped body is particularly inclined 23 to facilitate engagement and disengagement of the hook 20.

Next, the lock device 10 of this embodiment will be described. In particular, in FIGS. 4 and 5, the lock device 10 includes a hook 20 that engages with and disengages from a hook engaging portion 21.
A support shaft 15 for swinging and supporting the hook 20;
5 is provided on both sides, and has a bottom plate 19 large enough to close the ball hole 7; an inner plate 24 having the inner end of the bottom plate 19 bent toward the iron cover 1; And a fork 25 erected at the end. The downward hook 20 and the upward inner plate 24 are located substantially symmetrically with respect to the support shaft 15. Therefore, when removing the lock device 10, the T-shaped (not shown) ball 8 is used.
When the boundary between the bottom plate 19 and the inner plate 24 is pressed through the forks 25, 25, it swings counterclockwise around the support shaft 15, so that the hook 20 is Come off. Therefore, the swing of the hook 20 and the pressing of the ball 8 are one-to-one, and the hook 20 is
The iron cover 1 will not be pryed open without coming off, that is, damaging the hook 20 and the hook engaging portion 21.

When the lock device 10 is locked, the iron cover 1 is covered with the receiving frame 21 so that the hook 20 is moved inside the U-shaped frame 22 of the hook locking portion 21 by the elasticity of a coil spring 31 described later. The hook 20 is locked on the U-shaped frame 22 over the slope 23 on the side of the hook, and the locked state is established.

Next, a modification of the lock device will be described. 2 and 5, this lock device 10A
The hook 20 is engaged with and disengaged from the hook locking portion 21, the support shaft 15 for swinging and supporting the hook 20, the support shaft 15 is provided on both sides, and only the ball hole 7 is closed. And a bottom plate 19 having a size smaller than that of FIG. 4 and having an inner end of the bottom plate 19 bent upward.
A small amount of sediment accumulated on the bottom plate 19 is caused to flow down, and the work of removing the sediment is omitted. For this reason, the notched portion at the inner end of the bottom plate 19 is formed as an inclined surface 26 downward. In addition, since both end portions of the bottom plate 19 that is in contact with the side plate 13 are also inclined surfaces 19A that are inclined downward, the inclined surfaces 19A are formed.
Is in line contact with the side plate 13. Therefore, sand and dust are hard to bite, and even if bitten, they are easily released and the movement of the lock device 10 becomes smooth. Further, the base outer surface 27 (see FIG. 2) of the hook 20 is
The lock device 10A is easily engaged and disengaged along the funnel surface of the receiving frame 2.

Next, the stopper 17 will be described. In FIG. 3, the stopper 17 is formed of a U-shaped elastic clip, and a jaw 17a is provided inside the opening end thereof to clamp the prism 12 and the intersection 16 to prevent the support shaft 15 from coming off. .

The protective iron cover provided with the iron cover 1, the receiving frame 2 and the lock devices 10 and 10A as described above is not always installed on a horizontal road surface, and the road surface may be inclined. For this reason, the upper surface of the iron lid 1 is also installed so as to be inclined with the ball hole 7 upward, so that the locking device 10,
10A may incline inward around the support shaft 15 due to its own weight, and the hook 20 may be disengaged from the hook engaging portion 21 in some cases.

Therefore, in the first embodiment, spring receiving projections 29 and 30 are provided on the rib 28 of the iron cover 1 and on the inner surface side of the inner plates 24 and 24A, respectively.
The compressed coil spring 31 is provided. Therefore, due to the elasticity of the coil spring 31, the locking devices 10, 10
A is always pressed against the inner surface of the receiving frame 2 so that the hook 20 does not come off the hook engaging portion 21. Of course, when the hook 20 is removed, the locking devices 10 and 10A may be swung against the elasticity of the coil spring 31. The coil spring 31 is covered by a bellows 32.

Next, a second embodiment will be described. FIG.
At 0, a V-shaped elastic body 32 made of stainless steel, rubber, or the like is attached to the inner surface of the receiving frame 2 in the hook locking portion 21, and the hook 20 is held by the V-lip of the V-shaped elastic body 32.
Press the outer surface of the base. Although not shown, a hollow rubber spring may be provided in place of the V-shaped elastic body 32. In this case, the function of the V-shaped elastic body 32 is always exerted even when the iron cover 1 is fitted into the receiving frame 2 with the slightly deformed state.

[0027]

According to the present invention, according to the present invention, a bottom plate having a surface substantially equal to or slightly larger than the area of the ball hole is provided.
An inner plate provided inside the bottom plate and a side plate extending from the back surface of the lid constitute a box having an upper surface opening immediately below the burl hole, and the burl hole was closed with this box. -The hole is always concave and the position of the hole is known, and
The tip of the ball can be easily inserted.

Since the support shafts are provided on both sides of the bottom plate of the box and the downward hooks are provided on the bottom plate, the hook can be easily removed and the lock device can be easily operated simply by tilting the inner plate or the bottom plate with the ball. Become.

Since the side plate is also used as the bearing of the support shaft of the hook and the side plate of the box for closing the ball hole, the locking device can be simplified.

Since the hook is engaged with the hook engaging portion by applying elastic pressure, the hook does not come off from the hook engaging portion naturally even if the swing of the hook is made light.

Since the upward inner plate and the downward hook are provided substantially symmetrically about the support shaft, the operation of pushing the ball and the engagement and disengagement of the hook become one-to-one, and there is an error in opening and closing the lid. Movement.

Since the bottom plate is provided with a downwardly inclined surface, sand and dust are less likely to be caught, and even if they are caught, they are more likely to be disengaged.
Become

By the elastic pressure on the hook, the lock can be reliably performed even on the sloped land, and the lock can be prevented from being released due to the weight of the sediment such as sand.

[Brief description of the drawings]

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

FIG. 2 is a detailed view of a main part modification of FIG. 1;

3 is a partially omitted view (rear view) as viewed from the direction of arrow A in FIG. 2;

FIG. 4 is a perspective view of a main part of FIG. 1;

FIG. 5 is a perspective view of a main part of FIG. 2;

FIG. 6 is a sectional view of a main part (iron cover) of FIG. 2;

FIG. 7 is a sectional view taken along the arrow B in FIG. 6;

8 is a view as viewed in the direction of arrow C in FIG. 6 (back view).

FIG. 9 is a plan view of a main part (receiving frame) of FIG. 2;

FIG. 10 is a sectional view corresponding to FIG. 2 in a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Iron lid, 2 ... Receiving frame, 7 ... Ball hole, 10 ... Locking device, 13 ... Side plate, 15 ... Support shaft, 19 ... Bottom plate, 20 ... Hook, 21 ... Hook locking part, 24 ... Inner plate, 31 ... Coil spring

Claims (2)

(57) [Claims] 1. A manhole cover with a ball hole, a receiving frame into which the cover is fitted, and disposed immediately below the ball hole,
A swingably supported hook and the hook are disengaged,
And a hook locking portion provided inside the receiving frame, wherein the hook is provided downward and the bottom plate is substantially the same as or slightly larger than the area of the ball hole. And a support shaft provided on both sides of the bottom plate and swinging a hook, an inner plate which is provided on the lid center side of the bottom plate, and which stands upward, and supports the support shaft, and 1 extending from the back of the lid across the ball hole
A pair of side plates constitute a box having an upper surface opening, the box serves as a closed portion of a valley hole, and the hook is constantly pressed toward a hook engaging portion. Locking device. 2. The notch so that the width of the inner plate (24A) is smaller than the width of the bottom plate (19), and the inner end of the bottom plate (19) and the side plate (13) at the notch. Both ends of the contacting bottom plate (19) are formed by inclined surfaces (26) (19A) inclined downward, respectively.
A locking device for a manhole cover, wherein the cover is a protective iron cover for an inner cover (6) for a manhole made of PVC.