JP4014452B2 - Manhole structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manhole structure.
[0002]
[Object of the present invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a manhole structure that can be safely managed without the lid of the manhole jumping up or displaced due to vibrations of the automobile, internal pressure, or the like.
[0003]
[Means for Solving the Problems]
In order to achieve the above object, the structure of the manhole of the present invention comprises a manhole cover frame and a cover that can be stored inside the cover frame. Provided through the front and back of the lid, an engagement pin that rotates with the rotation of the lock rotator and a rotation prevention piece project from the back side of the lock rotator, and the lid further approaches the rotation prevention piece. On the other hand, on the lid frame side, a groove for engaging the pin is provided on the movement track of the engagement pin, and the lift stopper is inserted in the state where the engagement pin is inserted into the engagement groove. It is characterized by a manhole structure that is configured to be lowered to restrain rotation of the rotation prevention piece and to raise and lower the lift stopper to allow rotation of the rotation prevention piece.
[0004]
Furthermore, the manhole structure that achieves the object of the present invention comprises a manhole cover frame and a cover that can be housed inside the cover frame. An engagement pin that rotates with the rotation of the lock rotator and a rotation blocking piece project from the back of the lid of the lock rotator, and a pin hole is provided in a part of the lock rotator in the vertical direction. The lid is further provided with a lifting stopper close to the rotation prevention piece, while the lid frame side is provided with a groove for engaging the pin on the movement locus of the engagement pin. With the pin inserted into the engagement groove, the stopper pin can be inserted into the pin hole opened in the lock rotating body from the surface of the lid. , You can allow the rotation prevention piece to rotate by raising the lifting stopper It was constructed, in which characterized the structure of the manhole.
[0005]
[Embodiments of the present invention]
Embodiments of the manhole structure of the present invention will be described below with reference to the drawings.
[0006]
<I> Overall configuration.
The present invention includes a manhole cover frame 2 and a cover 1 that can be stored inside the cover frame 2.
The lid 1 is fixed to the lid frame 2 by engaging the engagement pin 32 on the lid 1 side with the engagement groove 34 provided on the lid frame 2 side, as will be described later.
[0007]
<B> Lock rotating body 3.
The lock rotator 3 is provided with a rotating shaft 31 penetrating the front and back of the lid 1.
A rectangular or other non-circular groove 37 is recessed in the exposed portion of the lock rotator 3 on the lid surface so that a rotational tool can be fitted to give a rotational force to the lock rotator 3.
[0008]
<C> Rotating arm.
On the back side of the lock rotator 3, a rotary arm 31 is provided so as to project in a direction orthogonal to the central axis of the lock rotator 3.
At the tip of the rotary arm 31 that rotates with the rotation of the lock rotator 3, an engagement pin 32 protrudes in the direction of the rotation locus of the lock rotator 3.
Accordingly, the engagement pin 32 moves on a circular orbit about the axis of the lock rotator 3 as the lock rotator 3 rotates.
[0009]
<D> Pin hole.
A pin hole 35 is opened in the vertical direction at any position of the rotary arm 31.
As will be described later, the pin hole 35 is configured such that the stopper pin 4 can be inserted and extracted from the outside of the lid.
[0010]
<E> Rotation prevention piece.
Further, on the back side of the lock rotator 3, a rotation blocking piece 33 protrudes in a direction perpendicular to the central axis of the lock rotator 3.
Since the rotation prevention piece 33 is integrated with the lock rotator 3, the rotation of the lock rotator 3 is constrained when an elevating stopper 5 described later is located in the rotation locus of the rotation prevention piece 33. .
[0011]
<F> Engagement groove.
On the other hand, on the lid frame 2 side, an engagement groove 34 for engaging the pin is provided on the movement locus of the engagement pin 32.
The engagement groove 34 is a hole having a wider interval than the diameter of the engagement pin 32 or a vertical vertical groove with the upper portion closed.
Therefore, when the pin 32 is inserted into the engagement groove 34, the lid 1 cannot be raised.
[0012]
<G> Stopper pin 4.
It is dangerous if the rotating arm 31 rotates due to the vibration of the automobile and the pin 32 comes out of the engaging groove 34.
Therefore, in order to restrain the rotation of the rotating arm 31, the tip of the stopper pin 4 is inserted into the pin hole 35 of the rotating arm 31.
For this purpose, the stopper pin 4 is inserted into the pin hole 35 from the surface of the lid 1 with the engaging pin 32 inserted into the engaging groove 34.
The stopper pin 4 includes a rod-like portion 41 that is inserted into the pin hole 35 and a screw portion 42.
The threaded portion 42 can be formed on the proximal end side of the rod-like portion 51 or can be formed on the distal end.
When the threaded portion 42 is formed on the proximal end side, the threaded portion 42 is screwed to the female screw formed on the lid 1.
When the threaded portion 42 is formed at the tip, the threaded portion 42 is screwed into a female screw formed on the inner surface of the pin hole 35.
[0013]
<H> Lift stopper 5
The lid 1 is provided with an elevation stopper 5 in proximity to the rotation prevention piece 33.
The elevating stopper 5 is a member having a substantially center position axially fixed to a part of the lid 1 by a horizontal pin 51 in a seesaw shape.
One of the lift stoppers 5 forms a descending block 52 and the other forms a push plate 53.
The lower block 52 is given a weight greater than that of the push plate 53.
Accordingly, with the manhole covered and the engaging pin 32 inserted into the engaging groove 34, the lowering block 52 is lowered by its own weight and is positioned within the rotation locus of the rotation preventing piece 33. Constraints rotation.
When the lid is opened, the push-up plate 53 is pushed down from the outside of the lid to raise the elevating stopper 5 so that the rotation preventing piece 33 can be allowed to rotate.
For this purpose, the lid 1 is provided with a slit through which a push bar for pushing down the push plate 53 can be inserted.
[0014]
<Re> Pull out the stopper pin 4.
When a person enters a manhole, the lid 1 needs to be opened.
In that case, the lock rotator 3 must be rotated from the outside of the lid 1 to pull the pin 32 out of the engagement groove 34.
However, since the rotation of the lock rotator 3 is restrained by the stopper pin 4, it is necessary to first pull out the stopper pin 4 from the rotating arm 31.
For this purpose, a tool is inserted into the non-circular groove at the top of the stopper pin 4 to rotate it, and the stopper pin 4 is pulled out.
[0015]
<N> Ascent of descending block 52.
In the covered state, the lowering block 52 of the elevating stopper 5 is lowered by its own weight and is located within the rotation locus of the rotation preventing piece 33.
Therefore, the push plate 53 of the elevating stopper 5 is pushed downward from the outside of the lid through the slit opened in the lid, and the lowering block 52 on the opposite side is pushed up.
Since the thickness of the lowering block 52 at the raised position is configured to be higher than the rotation locus of the rotation prevention piece 33, the rotation prevention piece 33, that is, the lock rotator 3 is allowed to rotate. .
[0016]
<Le> Open the lid.
Since there is no member that constrains the rotation of the lock rotator 3 in this way, the lock rotator 3 can be rotated to pull out the engagement pin 32 from the engagement groove 34. If the lid 1 is pulled up in this state, the member that restrains the lid frame 2 is removed, so that the lid 1 can be easily opened.
[0017]
[Effect of the present invention]
Since the structure of the manhole of the present invention is as described above, the following effects can be achieved.
<A> By inserting the stopper pin 4 into the pin hole of the rotating arm, it is possible to prevent an accident that the rotation of the rotating arm is restricted and the pin is pulled out.
<B> Further, even with the descending block 52 that is constantly descending due to its own weight, it is possible to restrain the rotation of the rotating arm and prevent the pin from being pulled out.
<C> In some cases, it is possible to prevent an accident in which the pin is pulled out by restraining the rotation of the rotating arm only by the lowering block 52 that is lowered by its own weight without using the stopper pin 4.
[Brief description of the drawings]
FIG. 1 is a perspective view of a manhole cover of the present invention.
FIG. 2 is an explanatory diagram of an engagement state between an engagement pin and an engagement groove.
FIG. 3 is an explanatory view of a state in which the lowering block is lowered to prevent rotation of the rotation prevention piece from the bottom of the lid.
FIG. 4 is an explanatory view of a state in which the lowering block is raised to prevent the rotation preventing piece from being rotated, as viewed from under the lid.
FIG. 5 is an explanatory view of a state in which the lowering block is raised and the lock rotating body is rotated as viewed from under the lid.

Claims (2)

It consists of a manhole cover frame and a cover that can be stored inside the cover frame.
The lid is provided with the rotation axis of the lock rotator through the front and back of the lid,
On the back side of the lock rotator, an engagement pin that rotates with the rotation of the lock rotator,
Protruding a rotation prevention piece,
The lid is further provided with a lifting stopper approaching the rotation prevention piece,
On the other hand, on the lid frame side, a groove for engaging the pin is provided on the movement locus of the engagement pin,
With the engagement pin inserted into the engagement groove,
Lower the elevator stopper to constrain the rotation of the rotation prevention piece,
The lifting stopper is raised to allow rotation of the rotation prevention piece.
Manhole structure. It consists of a manhole cover frame and a cover that can be stored inside the cover frame.
The lid is provided with the rotation axis of the lock rotator through the front and back of the lid,
On the back side of the lock rotator, an engagement pin that rotates with the rotation of the lock rotator,
Protruding a rotation prevention piece,
Furthermore, a pin hole is opened in the vertical direction in a part of the lock rotator,
The lid is further provided with a lifting stopper approaching the rotation prevention piece,
On the other hand, on the lid frame side, a groove for engaging the pin is provided on the movement locus of the engagement pin,
With the engagement pin inserted into the engagement groove,
Configured so that the stopper pin can be inserted into the pin hole opened in the lock rotating body from the surface of the lid,
Lower the elevator stopper to constrain the rotation of the rotation prevention piece,
The lifting stopper is raised to allow rotation of the rotation prevention piece.
Manhole structure.

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