JPH0215835Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is based on a mechanism for rotating iron covers such as manholes installed at the entrances and exits of various storage tanks and other underground structures, and in particular a mechanism for rotating the cover plate and locking it in a receiving frame. This invention relates to an iron lid that has a mechanism for sealing the space between the lid and the receiving frame by packing.

(Prior Art) Conventionally, iron covers installed at the entrances and exits of various storage tanks and underground structures have been provided with at least two protruding locking pieces on the cover plate or receiving frame as a locking mechanism at opposing positions. Alternatively, a mechanism is adopted in which the lid plate is provided with an L-shaped or inverted L-shaped locking groove in which the protruding locking piece is locked, and the locking piece is locked in the locking groove by rotating the cover plate. Furthermore, packing such as rubber is installed between the lid plate and the receiving frame to improve the sealing performance.

(Problem to be solved by the invention) An iron lid in which the lid plate is rotated and locked in this way, and the packing provided between the lid plate and the receiving frame provides good sealing performance is generally called a waterproof iron lid. Iron lids with such a mechanism were limited to those with a handle on the top of the iron lid that allows the lid plate to be easily rotated and locked, or those with a small diameter of 30 to 40 cm that can be opened and closed, and are lightweight. , iron plates with a diameter of approximately 60 cm or more and with a load-bearing capacity installed on the road surface for vehicles, etc. to pass over the iron cover are now required to have a locking mechanism and sealing performance. Due to the frictional resistance between the weight of the lid plate and the packing, it is difficult to rotate the lid plate, and iron lids that are not opened or closed often even if they are lightweight, have the packing stuck to the cover plate or the receiving frame, making it difficult to open and close them. may be difficult.

The object of the present invention is to eliminate the above-mentioned drawbacks and provide an iron lid that is easy to open and close.

(Means for Solving the Problems) That is, the present invention provides a mechanism in which the lid plate is locked by rotating the lid plate using a protruding locking piece and a locking groove provided between the cover plate and the receiving frame; In order to easily rotate the lid plate in an iron lid that has a mechanism to improve sealing performance through packing between the receiving frame and the receiving frame, a V-shaped recess is bored in the receiving frame to serve as a fulcrum for the lever rod.
By providing a notch that serves as the point of action of the screw rod at the outer peripheral edge opposite to the recess of the receiving frame of the lid plate,
This problem can be solved by creating a structure to which the principle of the lever can be applied.

(Example) The present invention will be described according to an example shown in the drawings.

Figures 1 to 4 are partial views showing the configuration of the present invention. The iron cover is fitted with a disc-shaped cover plate and a cover plate that is installed and fixed at the entrance/exit of an underground structure so that it can be opened and closed. It consists of a receiving frame, and its locking mechanism consists of the first to third
As shown in the figure, a locking piece 4 protruding from the outer surface of a leg-like piece 3 that hangs in an annular manner along the outer periphery of the cover plate 1 is attached to an upper part of the inner frame of the receiving frame 2. The cover plate 1 is locked by aligning the locking pieces 4 of the cover plate 1 with the L-shaped locking groove 5 and rotating the cover plate 1. As shown in FIG. 5, a locking piece 4 is provided protruding from the inner wall surface of the outer straight wall 21 of the receiving frame 2, and is inserted into an inverted L-shaped locking groove 5 provided in the leg-shaped piece 3 of the cover plate 1. It may be configured to lock,
The locking mechanisms are provided in at least two symmetrical positions at positions that equally divide the outer peripheral edge of the lid plate 1.

In the iron lid configured in this way, as shown in FIGS. 1, 2, and 4, an L-shaped lock is provided on the upper surface of the shelf 6 that supports the lid plate 1 provided on the inner wall of the receiving frame 2. The vertical part of the groove 5 is V-shaped, and a depression 8 is formed at the bottom to serve as a fulcrum for the screw rod, and a notch 7 is provided at an opposing position on the outer periphery of the cover plate 1 above the depression 8. be.

The notches 7 and depressions 8 provided in the lid plate 1 and the receiving frame 2 do not need to be provided in the locking mechanism part of the iron lid as shown in the example, and are located at opposite positions when the lid plate 1 and the receiving frame 2 are locked. , make a hollow with the screw rod 8
It can be inserted anywhere as long as it can be inserted into the notch 7.
There is no problem with providing a plurality of recesses at positions that equally divide the outer periphery of the lid plate 1. In this case, the recesses 8 provided in the receiving frame 2 have a V-shape that opens on the top surface of the shelf 6, and the width of the opening is L. It is proportional to the horizontal length of the letter-shaped locking groove 5.

In general, such iron lids have a shelf 6 that supports the step-shaped lid plate 1 formed at the upper end of the inner wall of the outer straight wall 21 of the receiving frame 2, as shown in FIG. An inner straight wall 22 is annularly raised on the inside of the cover plate 1, and is configured to be in close contact with a packing 9 made of annular rubber or the like attached to the back side of the lid plate 1 to maintain airtightness. As shown in the figure, the annular leg-shaped piece 3 of the cover plate 1 is attached to the upper end of the inner straight wall 22 or installed in the annular groove formed by the outer straight wall 21 and the inner straight wall 22. However, the present invention is not limited to this.

(Effect of the invention) Since the present invention is constructed as described above, when opening and closing the lid plate 1, the screw rod 10 is inserted through the notch 7 provided in the lid plate 1 shown in FIGS. 2 and 4. Then, insert it into the V-shaped recess 8 provided in the shelf 6 of the receiving frame 2, insert it into the tip of the screw rod 10, that is, into the recess 8 of the receiving frame 2, use its bottom as a fulcrum, and insert the notch 7 in the cover plate 1. By rotating the cover plate 1 as shown in FIG. 3 using the point of action of the screw rod 10, the cover plate 1 and the receiving frame 2 can be easily unlocked and locked. be. Further, when lifting the cover plate 1 from the receiving frame 2, it is also possible to lift the cover plate 1 with the screw rod 10 by using the 7 notches in the cover plate 1.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and are a partial view of an iron lid consisting of a disc-shaped lid plate and a receiving frame on which the lid plate is placed. A-line sectional view), Figure 2 is a partial sectional view along A-A line in Figure 1,
Figure 3 is a partial sectional view showing the locking mechanism removed from the position shown in Figure 2 with a screw rod, Figure 4 is a top view of Figure 1, and Figure 5 shows other locking mechanisms. FIG. 1... Lid plate, 2... Receiving frame, 3... Leg-like piece, 4...
... Locking piece, 5 ... Locking groove, 6 ... Shelf, 7 ... Notch, 8 ... Recess, 9 ... Packing, 10 ...
...A screw rod.

Claims (1)

[Scope of utility model registration request] A protruding locking piece 4 is attached to the outer surface of the leg-shaped piece 3 which is hung in an annular shape inside the outer peripheral edge of the back surface of the disc-shaped cover plate 1, or to the inner wall surface of the receiving frame 2 facing the outer surface of the cover plate. L-shaped or inverted L-shaped locking grooves are provided in at least two or more positions at positions that approximately equally divide the outer peripheral edge of the cover plate 1, and the locking pieces 4 lock on the leg-shaped pieces 3 of the receiving frame 2 or the cover plate 1. 5 is engraved and the locking piece 4 is inserted into the locking groove 5 and then rotated to lock the cover plate 1 to the receiving frame 2. A packing 9 is provided to maintain the airtightness, and a notch 7 is provided from the outer periphery of the cover plate 1 to serve as a point of action for the screw rod 10. The upper surface of the shelf 6 that supports the lid plate 1 of the lower receiving frame 2 of 7 has an opening wider than the width of the notch 7 provided in the lid plate 1, and a screw rod 1 is attached to the bottom of the opening.
A closed type iron lid having a rotation locking mechanism consisting of a mechanism in which a V-shaped recess 8 is bored as a fulcrum.