JPH11172715A - Locking device of lid for underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely achieve the locking and easily achieve the maintenance with a simple structure by engaging a hook of a holding lock with an engagement part of a frame body to receive a lid for an underground structure, hingewire attaching one end turnable in the prescribed angular range to the hook, and hingewise attaching a body part where the other end is urged against a back side of the lid for the underground structure to the back side of the lid. SOLUTION: An engagement part 2a with which a hook tip part 4a of a holding lock 3 hingewise attached to a back side of a lid 1 for a underground structure is engaged, is provided on a lower part of a frame body to receive a lid 1 for the underground structure such as a manhole lid. A hook 4 and a body part 5 to constitute the folding lock 3 are hingewise attached to each other by a parallel pin 6. The angle of the hingewise attached hook 4 is set to the angle θ at which the tip part 4a can be engaged with the engagement part 2a of the frame body 2 when the folding lock 3 is mounted on a back side of the lid 1 for the underground structure, and the hook 4 and the body part 5 hingewise attached to each other so that the hook is not turned over the angle θ. The body part 5 is hingewise attached by a parallel pin 6b in a condition where the other end is further urged against the back side of the lid 1 for the underground structure by a spring 6d.

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 cover for an underground structure, and more particularly to a locking device for a manhole cover.

[0002]

2. Description of the Related Art Underground buried objects and underground structural facilities in water and sewage and gas pipes, common ditches for electric power and communications, and the like, include manhole covers, hood covers, gate valves, and the like that close openings for communicating with the ground. It has a lid for underground structures. These underground structure lids are provided with a locking device in order to prevent a third party from entering the manhole or discarding foreign substances, or to prevent the lids from being opened by an internal pressure. However, there is a problem that rainwater or the like flows into the inside of the locking device from the opening thereof, or the odor inside the manhole leaks. For this reason, a locking device having a closed structure is known (for example, Japanese Utility Model No. -15880 publication).

An example of a conventional lid for an underground structure will be described with reference to FIG. FIG. 6 is a sectional view of a locking device for a manhole. The cover 1 for an underground structure such as a manhole cover to be fitted into the opening of the frame 2 has an engaging member 7 having an outward hook portion on the lower surface edge of the cover 1 for the underground structure inward and outward. It is suspended so that it can swing. In addition, a blind hole-shaped knurled hole 1a is provided in which the lid 1 for the underground structure can be opened and closed by a lid opening tool. On the other hand, an engaging edge 8 is provided on the frame 2 so as to protrude into the manhole, and is locked by engaging the engaging edge 8 with a hook portion of the engaging member 7. It has become. Unlocking is performed when the hook portion of the engaging member 7 is retracted into the manhole by the rotation of the lid 1 for the underground structure. This retreat is realized by a protruding portion provided on the frame 2 or the like.

[0004]

However, in the case of a structure in which the hook portion of the engaging member 7 is unlocked by the rotation of the lid 1 for the underground structure, it becomes difficult for the lid to be rotated by human power over time. Locking operation may be difficult. In addition, there is a problem that a gap formed between the frame and the manhole cover for discharging suddenly raised water or the like cannot be easily adjusted.

The present invention has been made to address such a problem, and an object of the present invention is to provide a locking device for an underground structure lid which has a simple structure and is easy to maintain.

[0006]

According to the present invention, there is provided an apparatus for locking a cover for an underground structure, comprising: an engaging portion provided on a frame for receiving the cover for an underground structure; In the locking device for a cover for an underground structure, which locks the folded lock by engaging with the engaging portion of the frame, a hook in which the folding lock engages with the engaging portion of the frame, and one of the hooks is attached to the hook. An end is hinged, and the other end is hinged to the underside of the underground structure lid, the one end pivots within a predetermined angle range, and the other end is the body. Has a hinged structure that is urged toward the underside of the underground structure lid.

According to the present invention, the locking device provided on the back surface of the lid for the underground structure has a double hinge structure, so that the locking can be securely performed with a simple structure, and the manhole cover can be easily rotated without a rotating operation. Can be unlocked. In addition, since the obstruction lock hole used when opening and closing the manhole cover becomes unnecessary, it is possible to prevent infiltration of unnecessary water such as rainwater and earth and sand, and to prevent odor from being emitted from the inside of the manhole.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus for locking a lid for an underground structure according to the present invention will be described with reference to FIG. FIG. 1A is a perspective view of a manhole, and FIG. 1B is a cross-sectional view along AA. FIG. 2 is an exploded perspective view of the folding tablet. A cover 1 for an underground structure such as a manhole cover is received in a tapered state so as to be openable and closable with the frame 2. At the bottom of the frame 2, a folding lock 3
Engaging portion 2 capable of engaging the hook tip portion 4a
a is provided. Further, a folding lock 3 is hinged on the back surface of the lid 1 for the underground structure. The main part of the folding lock 3 is constituted by a hook 4 and a body 5, and the hook 4 and the body 5 are hinged to each other by a parallel pin 6a.

When the folding lock 3 is attached to the underside of the underground structure lid 1, the hook 4 to which the hinge 4 is attached has a tip portion 4a.
Is set to an angle θ that can engage with the engaging portion 2 a provided on the frame 2. That is, the hook 4 and the body 5 are hinged without rotating below the angle θ. For example, the parallel pin 6 of the hinge is set so that the opening and closing of the hook 4 stops at the angle θ.
a Set the position of the attachment part.

The body 5 to which the hooks 4 are hinged is hinged by the parallel pins 6b with the other end urged against the back surface of the underground structure lid 1. As the urging force, mechanical means such as a spring 6d, magnetic means such as a magnet, or the like can be employed. Preferably, the parallel pins 6a and 6b are fixed by fixing means such as a split pin 6c.

The locking and unlocking method of the locking device of the present invention will be described. FIG. 3 is a sectional view showing a state at the time of locking.
FIG. 4 is a sectional view showing a state at the time of unlocking. The manhole cover opens and closes around a hinge mechanism (not shown) provided at a position farthest from the prying hole 1a of the cover. At the time of locking, that is, at the time of closing the manhole cover, the manhole cover is pulled up with a dedicated hand key and set on the frame 2. When the tip portion 4a of the hook slides on the tapered surface 2b of the frame 2, the hook portion 4 smoothly moves to the frame 2
Reaches the engaging portion 2a provided by the
The lock is automatically completed with the closing of the manhole cover. Further, the contact of the hook portion 4 is alleviated by the urging force of the folding lock, so that the lock can be performed smoothly.

At the time of unlocking, that is, at the time of opening the manhole cover, the hook 4b is pulled toward the user while the hand key is engaged in the knurled hole 1a and the cover is pulled up so that the projection 4b of the hook is attached to the frame. Guided by the protrusion 2c of the provided engaging portion, the tip 4a of the hook is disengaged from the engaging portion 2a of the frame, the engagement of the folding lock 3 is released, and the unlocking of the manhole cover is completed. Note that the projection 2c functions like a lever fixing point only at the time of unlocking, so that the folding lock 3 can be smoothly unlocked from the frame 2.

Further, since the stiffening hole 1a according to the present invention only needs to have a function of being pulled forward while pulling up the lid,
All can be bag-shaped. As a result, it is possible to prevent infiltration of rainwater, earth and sand, and emission of odor. Further, when the manhole cover is opened, the manhole cover must be pulled up by a dedicated means, for example, a dedicated hand key stick, and further pulled to the front, so that the manhole cover cannot be easily opened by a third party. By matching the shape of the knurled hole 1a with, for example, a dedicated hand key, the difficulty of unlocking by a third party is further improved.

Next, the state when the manhole is used will be described. FIG. 5 is a cross-sectional view illustrating a case where a lifting pressure is applied. When the manhole cover is pushed up by the pressure of blowing water or the like, the folding lock 3 engages with the engaging portion 2a provided on the frame 2, and furthermore, the urging force acts on the hook tip portion 4a and the body portion 5. In addition, the manhole cover is not unlocked, so that the blow-up water can escape and the pressure can be reduced. In the present invention, the gap between the frame 2 and the manhole cover can be adjusted by arbitrarily selecting the length of the body 5.

[0015]

According to the present invention, there is provided an apparatus for locking a lid for an underground structure,
A hook in which a folding lock is engaged with an engaging portion of the frame, and a body portion having one end hinged to the hook and the other end hinged to the back surface of the underground structure lid, Because one end rotates in a predetermined angle range and the other end has a hinge structure in which the body of the folding lock is biased to the back surface of the lid for the underground structure, a double hinge structure. In addition, the lock can be securely performed with a simple structure, and the lock can be easily unlocked without the rotation operation of the manhole cover. In addition, since the obstruction lock hole used when opening and closing the manhole cover becomes unnecessary, it is possible to prevent infiltration of unnecessary water such as rainwater and earth and sand, and to prevent odor from being emitted from the inside of the manhole.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a locking device for a lid for an underground structure.

FIG. 2 is an exploded perspective view of the folding tablet.

FIG. 3 is a sectional view showing a state at the time of locking.

FIG. 4 is a sectional view showing a state at the time of unlocking.

FIG. 5 is a cross-sectional view illustrating a case where a lifting pressure is applied.

FIG. 6 is a sectional view of a conventional manhole locking device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover for underground structure 1a Pry hole 2 Frame 2a Engagement part 2b Tapered surface 2c Projection 3 Folding lock 4 Hook 4a Hook tip 4b Hook projection 5 Body 6a, 6b Parallel pin 6c Split pin 6d Spring 7 Slope

Claims (1)

[Claims] 1. An underground structure lid is locked by engaging an engaging portion provided on a frame for receiving the underground structure lid and a folding lock provided on the back surface of the underground structure lid with the engaging portion. In the locking device for an underground structure lid, the folding lock includes a hook that engages with the engagement portion, and one end of the hook is hinged, and the other end is attached to a back surface of the underground structure lid. A body part to be hinged, wherein the one end rotates in a predetermined angle range, and the other end has a hinge structure in which the body part is urged to the back surface. Locking device for lids for underground structures.