JPH08311904A - Footholder mounting device for manhole, etc. - Google Patents

Abstract

PURPOSE: To surely and easily fit leg sections of a footholder to holes formed i a wall of a manhole, etc., easily bore the holes comparatively, surely mount the footholder to the wall of the manhole, etc., and to make it possible to endure a prolonged use of the footholder. CONSTITUTION: Core bars 4 are respectively extended from both side sections 3 and are used as mounting leg sections 6 of a footholder 1, and synthetic resin 5a covering the core bars 4 of the leg sections 6 are monolithically molded with synthetic resin 5 covering the side sections 3. A plurality of fins 7 are provided to the surface of the synthetic resin 5 of the leg sections 6 toward the side sections 3 from the leg sections 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole having a foot portion and side portions located on both sides thereof, the foot portion and the side portions being formed of a cored bar and a synthetic resin covering the cored bar. The present invention relates to a mounting device for a footrest for equality.

[0002]

2. Description of the Related Art Conventionally, a footrest for a manhole or the like, which has a foot step and side portions located on both sides of the foot step, the foot step and the side portions being formed of a core metal and a synthetic resin covering the core metal. As a mounting device for the device, for example, as shown in Japanese Utility Model Publication No. 4-4040, a foot in which hook-shaped legs are extended from both sides and the hook-shaped legs are formed on a wall of a manhole or the like. There is one in which the foot hanger is fixed by being inserted into the hole for fixing the hanger and being hardened with an adhesive.

Also, as shown in FIG. 4, the leg parts extending linearly from both sides are inserted into the holes for fixing the foot device formed in the wall of the manhole or the like to fix the foot device. There are also some. That is, a split 23 is formed at the tip of each of the legs 22, 22 extending linearly from both sides 21, 21 of the footrest 20 in the axial direction. Is arranged. Then, with the piece 24 slightly inserted into the tip opening of the leg portion 22, a hole having a diameter substantially equal to the outer diameter of the leg portion 22, for example, a hole formed in the wall of the manhole,
The leg 22 is inserted while hitting the step 25 or the like of the footrest 20 with a hammer. At this time, when the piece 24 comes into contact with the inner wall of the hole, thereafter, the piece 24 sequentially enters the leg portion 22, and the tip end portion of the split portion 23 of the leg portion 22 is successively expanded in diameter. , The leg portions 22 are in contact with the periphery of the hole, and the footrest 20
The legs 22 of the are fixed to the wall of the manhole.

[0004]

By the way, in the case where the leg portions are hook-shaped, a manhole for inserting the leg portions is used.
Since the diameter of the hole formed in the wall of the tool is large, the hole digging work is not easy, it requires an excessive amount of labor, and a large amount of adhesive is required. If the hook is used for a long period of time, the fixing by the adhesive may be broken and the foot hook may rattle.

Further, even in the case of using the linearly extending leg portion, since the piece is moved by utilizing the inner wall of the hole, the hole formed in the wall of the manhole or the like has a precise depth. It is necessary to install it, and the work is troublesome,
Since the hammer hits the foot step when attaching the footrest, the footrest may be deformed.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to attach a footrest to a hole formed in a wall of a manhole or the like. The legs can be fitted securely and easily, holes can be drilled relatively easily, and the foot attachment can be securely attached to the wall of the manhole, etc., so that the foot attachment can withstand long-term use. It is intended to provide a secure attachment device for a footrest for a manhole or the like.

[0007]

In order to achieve the above object, a mounting device for a footrest for a manhole or the like according to the present invention is a leg for mounting a footrest by extending cores from both sides. And a synthetic resin that covers the core of the leg is integrally molded with the synthetic resin that covers the side, and a plurality of fins are formed on the surface of the synthetic resin on the side of the leg from the side of the leg toward the side of the side. It is characterized by having.

Further, a core metal is extended from both sides to form a leg portion for mounting a footrest, a male screw is screwed on a tip end portion of the core metal of the leg portion, and a female screw to be engaged with the male screw is internally provided. And a cap made of a synthetic resin having a plurality of fins on the surface thereof is attached to the core metal of the leg portion.

[0009]

Since it is a mounting device for a footrest for a manhole or the like configured as described above, first, a diameter (a very large diameter) substantially equal to the outer diameter of the synthetic resin of the leg or the outer diameter of the cap. In the hole formed in the wall of the manhole, for example, the leg portion of the footrest is inserted with the fins being pushed by the peripheral wall of the hole.
Then, the entire footrest is slightly pulled toward you. As a result, the tips of the plurality of fins bite into the peripheral wall of the hole while expanding their diameters. By this operation, the leg side is
The leg part of the footrest is firmly fixed to the wall of the manhole by being closely attached to the hole formed in the wall of the manhole.

In the existing footrest, a synthetic resin cap having a plurality of fins formed on the inside of the female screw is screwed into the tip of the leg core bar. Similarly to the above, the leg portion of the footrest can be securely fixed to the wall of the manhole.

[0011]

1 and 2 relate to an embodiment of the present invention. FIG. 1 is a plan view showing a state in which a footrest is attached to a manhole, and FIG. 2 is a side view.

In the figure, reference numeral 1 denotes the entire footrest, and the footrest 1 is composed of a foot portion 2 and side portions 3 and 3 located on both sides thereof. The side portion 3 and the side portion 3 are formed by coating an iron-made core metal 4 having a substantially U-shape in a plan view with a synthetic resin 5 such as polypropylene to prevent corrosion.

The core metal 4 is extended from both side parts 3 and 3 to form a core metal 4a of the mounting leg parts 6 and 6 of the footrest 1. Further, the synthetic resin 5 covering the side portion 3 is also attached to the leg portion 6.
A synthetic resin 5a that extends to the side and covers the core metal 4a is formed. The leg 6 is formed on the surface of the synthetic resin 5a on the leg side.
A plurality of (for example, three) fins 7 are formed integrally with the synthetic resin 5a from the side toward the side portion 3 side. Also, this fin 7
Each of the tips is slightly curved so as to expand outward.

In the mounting device for the footrest 1 having the above-described structure, when the footrest 1 is fixedly mounted on, for example, the wall 8 of the manhole, holes are formed in the wall 8 of the manhole at predetermined intervals. To drill. The hole diameter is set so that the outer diameter of the synthetic resin 5a of the leg portion 6 is substantially equal (a slightly large diameter), but the depth may be slightly longer without requiring a particularly strict dimension.

Then, the leg portion 6 of the footrest 1 is inserted into the hole while the tips of the fins 7 are pushed by the peripheral wall of the hole. Then, the entire footrest 1 is slightly pulled toward you.
As a result, the tips of the fins 7 bite into the peripheral wall of the hole while expanding their diameters. By this operation, the leg portion 6 side is brought into close contact with the hole formed in the wall of the manhole, and the leg portion 6 of the footrest 1 is securely fixed to the wall of the manhole.

FIG. 3 is a side view of the cap according to the present invention, and the cap 11 is advantageous when applied to an existing footrest. The cap 11 has an internal thread 12 formed therein and a plurality of fins 13 on the surface thereof, and is made of synthetic resin. The attachment device for a footrest using the cap 11 is configured by screwing a female screw of the cap 11 onto a male screw of a tip end portion of a cored bar extending from a side portion of an existing footrest.

Also in this case, as in the first embodiment,
Insert the leg of the footrest into the hole formed in the wall of the manhole in such a manner that the tips of the fins 13 are pushed by the peripheral wall of the hole. When the fins 13 are pulled in, the tips of the fins 13 bite into the peripheral wall of the hole while expanding their diameters. By this operation, the leg portion side is brought into close contact with the hole formed in the wall of the manhole, and the leg portion of the footrest is securely fixed to the wall of the manhole.

[0018]

According to the present invention, a core metal is extended from both sides to form a leg for mounting a footrest, and a synthetic resin covering the core of the leg is a synthetic resin covering the side. In addition to being integrally molded, a plurality of fins are provided on the surface of the synthetic resin on the side of the leg from the side of the leg to the side of the leg. It is pressed around the hole formed in the wall and fits securely, the foot attachment is securely attached to the wall of the manhole, etc., the attachment operation is easy, and the foot attachment can withstand long-term use. It is a safe attachment device for footwear for manholes.

When the cap is used, it can be advantageously applied to an existing footrest, and the fin of the leg is pressed around the hole formed in the wall of the manhole or the like. And the footrest is securely attached to the wall of the manhole, etc., the mounting operation is easy, and the footrest is a safe footrest for manholes that can withstand long-term use. It becomes a fixture mounting device.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a footrest is attached to a manhole using an attachment device according to an embodiment of the present invention.

FIG. 2 is a side view thereof.

FIG. 3 is a side view of a cap using a mounting device according to another embodiment of the present invention.

FIG. 4 is a plan view of a conventional example.

[Explanation of symbols]

 1 Footing device 2 Foot part 3 Side part 4,4a Core metal 5,5a Synthetic resin 6 Leg part 7,13 Fin 11 Cap 12 Female screw

Claims (2)

[Claims] 1. A footrest for a manhole or the like, which has a foot step and side parts located on both sides thereof, the foot step and the side parts being formed of a cored bar and a synthetic resin covering the cored bar. , Extending the core metal from both sides to form a leg part for mounting a footrest, and integrally forming a synthetic resin covering the core metal of the leg part with a synthetic resin covering the side part, and A mounting device for a footrest for a manhole or the like, characterized in that a plurality of fins are provided on a surface of a synthetic resin from a leg portion side to a side portion side. 2. A footrest for a manhole or the like, which has a foot step and side parts located on both sides thereof, the foot step and the side parts being formed of a cored bar and a synthetic resin covering the cored bar. , A metal bar is extended from both sides to form a leg for mounting a footrest, a male screw is screwed on the tip of the metal core of the leg, and a female screw that is screwed with the male screw is formed inside. A mounting device for a footrest for a manhole or the like, characterized in that a cap made of synthetic resin having a plurality of fins is attached to the core metal of the leg portion.