JPS5849260Y2 - Automatic locking manhole cover - Google Patents

Description

[Detailed description of the invention] This invention is a manhole cover installed on the road that is automatically locked at the same time as it is covered, and cannot be unlocked as it is, and can be opened by simply inserting a stick. As shown in the figure, the iron manhole cover 1
A receiver 2 is provided at several locations (4 locations in the drawing) on the back side of the
The base of a T-shaped beak part 4, which has a beak part 3 at one end and a weight part 5 at the other end, is suspended and pivotally attached to the receiving rod 2, and at the lid position on the throat side,
An insertion hole 6 is bored and a lock 7 having a protrusion 7' that can be inserted and removed is provided in the insertion hole 6, and the length of the protrusion 7' is the depth from the bottom surface of the lid to the receiving part 8 that receives the lid. With the above, the receiving part 9 is provided at a position corresponding to the beak part of the receiving part 8, and the beak part 3 and the receiving part are inserted and locked with the upper end of the protrusion 7' of the key stick inserted into the lower end of the insertion hole 6 of the lid 2. The structure is such that the position of the holder 2 is set so that it is separated from the part 9 in the horizontal direction.

Since the present invention has the above-described structure, if the cover of the present invention is covered with the receiving part 8 while the stick key 1 is inserted into the insertion hole 6, and the stick key 7 is pulled out, the lock will be automatically locked.

That is, since the tip of the bar key and the protrusion 7' push down the beak of the T-shaped beak rod 4, the tip of the beak fits inside without getting caught in the receiving part, and when the key is removed, the T-shaped beak due to the weight of the weight part 5. Since the beak is tilted and the beak is engaged with the receiving part 9, the beak is automatically engaged and locked.

Therefore, in the normal covered state, the lid is locked internally, so unauthorized persons cannot open the lid in vain.

If necessary, you can easily unlock and open the lid by simply inserting the key.

As described above, in the present invention, the lid is always locked when it is covered, and the lid cannot be opened in vain, so the interior can be protected from radical mobs, and the lid can be easily opened and closed as needed.

[Brief explanation of drawings]

Figure 1 is a front view of the invented product, Figure 2 is a cross-sectional view of the same side, and Figure 3 is a front view of the device.
The figure is a front view of the key, and FIG. 4 is an enlarged side view of the main part. 1... Manhole cover body, 2... Receiver,
3...Beak, 4...T-shaped beak rod, 5...
... Weight part, 6 ... Insertion hole, 7' ...
... protrusion, 7 ... stick key, 8 ... receptacle, 9 ... receptacle.

Claims (1)

[Scope of utility model registration request] A receiving rod 2 is provided at several places on the back side of the iron manhole cover body 1, and the receiving rod 2 has a beak portion 3 at one end and a weight portion 5 at the other end.
The base of a T-shaped beak rod 4 is pivoted and suspended, an insertion hole 6 is bored at the lid position on the throat side, and a bar key 7 having a protrusion 7' that can be freely inserted and removed is provided in the insertion hole 6. The length of the protrusion 7' is at least the depth from the lower surface of the lid to the receiving part 8 that receives the lid, and a receiving part 9 is provided at a position corresponding to the beak of the receiving part 8, and the protrusion of the key stick is Automatic locking characterized in that the position of the receiver 2 is set so that the beak 3 and the receiver 9 are separated in the horizontal direction with the upper end 7' inserted and locked into the lower end of the insertion hole 6 of the lid 2. manhole cover.