JPH0545719Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a locking device for a ventilation opening/exit in a public ditch.

(Prior Technology) A common ditch in which gas pipes, water pipes, electricity, telephone cables, etc. are buried, has entrances at regular intervals that also serve as ventilation holes and allow workers and equipment to enter.

The structure was made sturdy by using grating, and had many gaps, making it functional as a ventilation hole.

However, when workers enter the interior with equipment for maintenance and inspection, the grating is heavy and cannot be opened by one person, which is cumbersome.

Therefore, by dividing the grating into multiple structures and configuring these gratings to move on rails, we devised a ventilator/exit that could be easily opened by a single worker. It is necessary to provide a strict lock to prevent damage to cables, etc. from entering the building.

(Problems to be Solved by the Invention) Therefore, in order to achieve these objectives, this invention provides a locking device for the entrance/exit of a ventilation opening in a common ditch, which can be tightly locked and can be easily opened/closed from the inside in case of an emergency. It is.

[Structure of the idea]

(Means for Solving the Problems) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In a communal ditch where the ventilation opening/exit is opened or closed with grating, the grating 1 A box 2 is formed at the top of the box, and another key A held in
A rotary key 3 is provided, which has an engagement end 3a with the common groove, and a handle 3b at the bottom for manually opening the common groove from the inside, and an arm-shaped or plate-shaped interlocking member is provided in the middle of the rotary key. A member 4 is pivotally mounted, and connecting rods 3c, 3c are pivotally supported on the interlocking member 4 at positions facing each other across the rotation key 3, and at the ends of these connecting rods 3c, 3c. grating 1
A cover 8 with a key 7 covering the rotation key 3 is provided on the upper part of the rotation key 3, and a cover 8 with a key 7 is provided on the upper part of the rotation key 3. 8 has a rain cover 9
It consists of a

In addition, the rain cover 9 has a finger hole 10 for removal.
, and the lid 11 may be rotatably supported in the hole.

Further, the key A for opening and closing the rotation key 3 is held by one person, and the key 7 of the cover 8 with the key 7 is held by another person, so that the door can be opened when two people are together.

Furthermore, in the drawings, the grating 1 is shown as having a structure that opens and closes while running on a rail, but it is not limited to this structure, and of course, it is also possible to use a grating that opens and closes with a hinge or the like. It is.

[Effect of idea]

According to this invention, since it can be opened and closed only with two keys, the rotary key 3 and the key 7 provided on the cover 8, it is safe because there is no risk of the internal lock being destroyed, and moreover, the lower end of the rotary key 3 Since it has a handle 3b, even if it is trapped inside due to an accident that occurs outside the common ditch, it can be opened easily from the inside by turning the handle 3b, which is extremely beneficial.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an embodiment of this invention, Fig. 2 is a partially cutaway plan view showing an embodiment of this invention, and Fig. 3 is a state in which this invention is used. FIG. 1...Grating, 2...Box, 3...
Rotation key, 3a... engaging end, 3b... handle, 3c... connecting rod, 4... interlocking member, 5... grating removal prevention frame, 6...
...Bar, 7...Key, 8...Cover with lock, 9...
Rain cover, 10... Finger hole for removal, 11...
...Lid, A...Key.

Claims (1)

[Scope of utility model registration request] A box 2 is formed in the grating 1 at the ventilation opening/exit in a common ditch where the ventilation opening/exit is opened or closed with a grating,
A rotary key 3 is provided in the upper part of the box, which has an engaging end 3a for engaging another key A, and in the lower part, a handle 3b for opening the box by hand from inside the common groove. An arm-shaped or plate-shaped interlocking member 4 is pivotally attached to the middle of the key, and connecting rods 3c, 3c are pivotally supported on the interlocking member 4 at opposing positions with the rotation key 3 in between. At the ends of these connecting rods 3c, 3c, bars 6 are provided which pass through both edges of the grating 1 and fit into the external grating removal prevention frame 5, and at the top of the rotation key 3, there is provided a bar 6 which is inserted into both ends of the grating 1 and fitted into the external grating removal prevention frame 5. A locking device for an entrance/exit of a communal ditch which also serves as a ventilation opening, characterized in that a cover 8 with a key 7 covering a key is provided, and a rain cover 9 is further provided on the cover 8 flush with a grating.