JP2002180490A - Closing plug for keyhole in manhole lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a closing plug for a keyhole in a manhole lid being easy to fit into the keyhole without the possibility of being detached even if loosely fitted therein. SOLUTION: A vertical portion 3 is provided beneath a surface plate 1 and horizontally extending legs 6 are provided at the right and left of the lower end of the vertical portion 3. Dents 7 are provided at the right and left of the vertical portion 3 at positions above the legs. When the closing plug is pushed into the keyhole in the manhole lid, both legs 6 at the lower end pass through the keyhole as they are bent inside the dents 7. After passing through the keyhole, both legs 6 are restored to their original condition by their own elasticity whereby the closing plug is mounted in the keyhole. Even if the plug tends to get out upwards, both legs 6 are hooked to keep the plug in.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plug for closing a keyhole provided in a manhole cover.

[0002]

2. Description of the Related Art A manhole cover is provided with a keyhole.
When opening the manhole cover, insert the tip of the elongated hook bar into the keyhole and turn the hook bar 90 degrees. Then, hook it up with a hook and remove it, and remove the manhole cover.

By the way, an unpleasant odor may leak from a manhole cover laid on a road or the like through a keyhole. The heel of a pedestrian's high heel may fall into the keyhole, which can cause a fall and endanger the body. Therefore, a filling plug as shown in FIG. 3 was fitted into the keyhole to close the keyhole. Here, the structure of the filling plug of FIG. 3 will be described. The left figure in FIG. 3 is a front view of the filling plug,
The right figure is a bottom view. The filling plug is made of rubber and has a structure in which an embedding piece 2 is provided downward from the lower surface of a rectangular surface-shaped surface plate 1. The embedding piece 2 is a portion to be fitted into the keyhole of the manhole cover, and has a plate-shaped vertical portion 3 extending downward from the center of the surface plate 1, and a circular arc in the center of the vertical portion 3 with the vertical portion 3 as the center. It has a structure in which a bulging portion 4 is provided. The outer edge of the vertical portion 3 is an inclined surface that is gradually inclined inward as going downward. The portions of the vertical portion 3 and the bulging portion 4 are slightly larger than the keyhole. For this reason, it is to be hammered into the keyhole and fitted.

[0004]

By the way, the keyhole of the manhole cover is never uniform, and the size and the shape vary slightly. Therefore, if the shape of the keyhole and the shape of the filling plug do not match well, the filling plug may not be able to be fitted. Also, if the plug was loose in the keyhole, it quickly came off. Even if it was firmly fitted, if the vibration from the car continued to apply, it gradually loosened over time, and eventually it sometimes came off. The problem to be solved by the present invention is to provide a manhole cover keyhole filling plug that can be easily fitted into a manhole cover keyhole and does not come off even if it is loosely fitted.

[0005]

According to the first aspect, the present invention is used as follows. That is, the plug is pushed into the keyhole of the manhole cover. The legs 6 at the lower ends pass through the keyhole while bending upward, and after passing, the legs 6 return to their original positions by their own elasticity, and the plug is attached in the keyhole. If the plug is loose or loose with the passage of time, the legs 6 are caught and prevented from escaping, even if the plug tries to jump out of the keyhole. Fillers can be made slightly smaller to accommodate any keyhole.

According to the second aspect of the present invention, when the legs 6 are bent upward when the plug is pushed into the keyhole, the legs 6 can be bent into the recesses 7 of the vertical portion 3.

According to the third aspect, when removing the filling plug from the keyhole, it is possible to insert a tool such as a screwdriver into the notch 5 provided on the edge of the surface plate 1.

According to the fourth aspect, since the entire filling plug is made of an elastic material such as rubber, it can be easily manufactured by integral molding or the like. Moreover, when it fits in a keyhole, it can support elastically.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The plug for a keyhole of a manhole cover according to the first aspect of the present invention has a size capable of passing through a keyhole below a surface plate 1 shaped to fit into an upper portion of the keyhole of the manhole cover. An embedding piece 2 having a vertical portion 3 is provided, and legs 6 made of an elastic material having a length protruding right and left from both longitudinal edges of the keyhole when fitted in the keyhole are provided on the left and right of the lower end of the vertical portion 3, respectively. It is provided.

According to a second aspect, in the first aspect, the right and left sides of the vertical portion 3 are located above the legs 6.
When both legs 6 are bent upward, a round recess 7 is provided.

According to a third aspect of the present invention, in the first aspect, a notch 5 for inserting a tool such as a driver is provided at an edge of the surface plate 1.

According to a fourth aspect, in the first aspect, the whole is made of an elastic material. As the elastic material, a material having elasticity such as rubber or synthetic resin is used.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view and a bottom view showing the filling plug of the embodiment. The point that the embedding piece 2 is provided below the surface plate 1 is the same as the conventional filling plug. A U-shaped notch 5 is provided at one longitudinal end of the surface plate 1. Notch 5
Is for inserting a tool such as a screwdriver when removing a filling plug fitted in a keyhole of a manhole cover. The vertical portion 3 is formed to be slightly longer than the conventional one, and legs 6 extending horizontally are provided on the left and right of the lower end of the vertical portion 3, and recesses 7 are provided on the left and right of the vertical portion 3 at positions above the legs 6. ing. The recess 7 is sized to fit the leg 6 when the leg 6 is bent upward.

The filling plug shown in FIG. 1 is used as shown in FIG. That is, the plug is pushed into the keyhole of the manhole cover. The lower legs 6 pass through the keyhole while bending into the recesses 7 of the vertical portion 3, and after passing, the legs 6 return to their original positions by their own elasticity, and the filling plugs are attached in the keyholes, and are shown by solid lines in FIG. 2. State. FIG. 2 is a longitudinal sectional view showing a state in which a filling plug according to one embodiment of the present invention is fitted in a keyhole of a manhole cover.

[0015]

When the plug for manhole cover keyhole according to the present invention is used, it can be easily fitted into the manhole cover keyhole, and does not come off even if it is loosely fitted.

[Brief description of the drawings]

FIG. 1 is a front view and a bottom view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a method of using the filling plug shown in FIG.

FIG. 3 is a front view and a bottom view showing a conventional filling plug.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Surface board 2 Embedded piece 3 Vertical part 5 Notch 6 Leg 7 Depression

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Shigeru Yamazawa 3-6-6 Kandanishiki-cho, Chiyoda-ku, Tokyo Yamajo No. 3 Building Iron Cover Industry Co., Ltd. (72) Noriyuki Koyama 3-chome, Kandanishiki-cho, Chiyoda-ku, Tokyo No. 6 Yamashiro 3rd Building Iron Cover Industry Co., Ltd. F-term (reference) 2D047 BB02 BB08

Claims (4)

[Claims] 1. An embedding piece (2) having a vertical portion (3) sized to be able to pass through a keyhole below a surface plate (1) shaped to fit into an upper portion of a keyhole of a manhole cover. And a manhole cover keyhole provided on each of the left and right ends of the lower end of the vertical portion (3) with legs (6) made of an elastic material having a length protruding left and right from both longitudinal edges of the keyhole when fitted into the keyhole. Stuffing stopper. 2. A vertical recess (3) provided on both sides of the vertical portion (3) above the legs (6) when the legs (6) are bent upward, respectively. 4. The filling plug for a keyhole of a manhole described in the above. 3. A keyhole plug for a manhole cover according to claim 1, wherein a notch (5) for inserting a tool such as a screwdriver is provided at an edge of the surface plate (1). 4. The filling plug for a keyhole of a manhole cover according to claim 1, wherein the whole is made of an elastic material.