JPH0237865Y2 - - Google Patents

Description

[Detailed explanation of the invention] With this invention, when the manhole cover is closed, it is automatically locked and cannot be unlocked in that state.When opening the manhole cover, it can be unlocked simply by inserting the bar key as before. This invention relates to an automatic locking device for manhole covers.

As this type of automatic locking device, one in which a hook with a weight was pivotally attached to the manhole cover body was developed in 1983.
This is known as shown in Publication No. 49260, but it has the disadvantage that the hook may come off and open when the water blows up from below strongly during heavy rain, etc., and as stated in the explanation, it is difficult to lock the door. Not only is it inconvenient to use as the key must be inserted into the keyhole to leave the hook in the unlocked state, but the lock may break when the lock is closed, or the key may protrude, making it dangerous. It was hot.

Therefore, the present invention aims to provide an automatic locking device that does not have these drawbacks.

That is, the present invention provides hooks on the outside at appropriate locations within the manhole cover holder frame, and hooks on the inside of the manhole cover in which the manhole cover body is pivotally attached to the manhole cover holder frame or the position for opening the manhole cover body is determined. An appropriate number of lock pieces each having a receiving part are pivotally mounted at appropriate locations within the manhole cover receiving frame, each lock piece is provided with a spring for raising the receiving part, and the hook is attached to the inner edge of the manhole cover body. An automatic locking device for a manhole cover, characterized in that an engaging protrusion is provided and a key insertion hole is provided at a position corresponding to the receiving portion of the manhole cover, and an embodiment thereof is based on the drawings. The explanation is as follows.

In the figure, reference numeral 1 denotes a manhole cover holder frame, on which a lock piece 4 with a hook 2 on the outside and a receiving part 3 on the inside is pivoted at a suitable number of places on the inside using a shaft 5, and the receiving part 3 is raised. Push the stainless steel spring 6 into the lock piece 4
It is provided in Note that 7 is a stopper.

Reference numeral 8 denotes a manhole cover body which taper-fits into the manhole cover receiving frame 1, and has a protrusion 9 on its inner edge that engages with the hook 2, and a hole 11 for inserting a key 10 at a position corresponding to the receiving part 3. It is being

It is assumed that the manhole cover body 1 is pivotally connected to the manhole cover frame 1, or a mark or the like is provided to determine the relative position of the manhole cover body 1 with respect to the manhole cover frame 8 when it is opened.

Also, the outer surface 2a of the hook 2 and the inner edge 9 of the protrusion 9
A is sloped to improve sliding.

Since the present invention is constructed as described above, when the manhole cover body 8 is fitted into the manhole cover receiving frame 1, it is automatically locked.

That is, when the manhole cover body 8 is fitted, the protrusion 9 slides the hook 2 against the spring 6 and rotates the lock piece 4 clockwise, and when the manhole cover body 8 is completely fitted, the lock piece 4 moves against the spring 6.
It is automatically engaged and locked in order to return to its original state.

Therefore, when the lock is in the locked state, not only is it impossible for anyone other than the person concerned to open the lock, but even if the water is blown up strongly, the holding force of the spring 6 is still working, so the lock cannot be opened. .

When opening the door, the key 10 can be opened simply by inserting the key 10 into the insertion hole 11 and rotating it 90 degrees as shown in FIG. 2, as in the conventional case. That is, stick key 10
When inserted into the insertion hole 11, the receiving part 3 is pushed and the lock piece 3 rotates clockwise against the spring 6 to open the lock.
It can be opened by turning the stick key 10 90 degrees and pulling it up.

As described above, according to the present invention, it is easy to use because it automatically locks even when the key is removed, and it also has the advantage that it will not unlock even if there is a strong splash of water. This is an excellent automatic locking device for manhole covers.

[Brief explanation of the drawing]

Figure 1 is a longitudinal side view of an embodiment of the present invention when it is locked;
FIG. 2 is a vertical side view when the lock is unlocked. 1... Manhole cover holder frame, 2... Hook, 3...
...Receptacle, 4...Lock piece, 5...Shaft, 6...Spring, 7
...Stopper, 8...Manhole cover, 9...
Protrusion, 10... stick key, 11... insertion hole.

Claims (1)

[Scope of utility model registration request] For manholes in which the manhole cover is pivoted to the manhole cover frame or the position for opening the manhole cover is determined, hooks are provided on the outside and receivers are provided on the inside at appropriate locations within the manhole cover frame. At the same time, the lock piece is pivotally attached to an appropriate position within the manhole cover receiving frame, a spring is provided on the lock piece to raise the receiving part, and a protrusion that engages with the hook is provided on the inner edge of the manhole cover body. An automatic locking device for a manhole cover body, characterized in that an insertion hole for a bar key is provided at a position corresponding to the receiving part of the cover body.