JPH0561240U - Waterproof cap for manhole iron cover - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] When rainwater, mud, etc. that flow into the manhole from the gap between the manhole iron cover and the manhole iron cover frame are prevented, and when a vehicle, etc. passes over the manhole iron cover. Prevents noise caused by rattling between the lid and the receiving frame. [Structure] The seal packing main body 2A has a flat disk-shaped rubber sheet 2A1 configured to have an outer periphery that is substantially the same as the outer periphery of the stepped portion 1E of the receiving frame 1A, and a contact edge 2A2 of the rubber sheet to the stepped portion 1E. A bent portion 2A3 having a substantially U-shaped cross section formed in an inward position, and a protruding portion 2A31 is provided on the inner peripheral wall portion of the bent portion 2A3 so as to project inward of the manhole. A projecting shape 2A32 is provided on the outer peripheral wall portion toward the outside of the manhole, and the compression rubber ring 2B has a flat circular ring shape so that the rubber rod-shaped body corresponds to the bent portion 2A3 of the seal packing body from above. Moreover, the rubber rod-shaped body is configured to have a substantially oval cross section so as to be fitted into the bent portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a waterproof cap for a manhole iron cover.

[0002]

[Prior Art]

 Conventionally, this kind of thing is generally as follows. 1. Flat rubber type packing 3 is attached to the seat of the receiving frame. 2. A type with a plastic cover 4 that covers the entire hole using the water receiving groove of the receiving frame. 3. Instead of using packing or covers, the keyhole of the iron lid is covered with a rubber stopper to prevent water from entering.

[0003]

[Problems to be solved by the device]

 The conventional techniques described above have the following problems. 1. The type in which the flat rubber type packing is attached to the seat of the receiving frame is a. Since the mating surface between the receiving frame and the iron lid has rattling, even if the flat rubber type packing is attached, it lacks watertightness and almost does not exhibit its original function. B. Mud accumulates in the water receiving ditch and requires time for maintenance (cleaning). C. It has a drawback that it easily comes off and easily falls into the manhole during work. 2. In the case of a plastic cover, a. Since the material is polyethylene, etc., it is inferior to rubber in terms of adhesion to the surface to be mounted, and water tightness is poor compared to rubber. B. Deform over time. In particular, if it is not properly attached, it will be set in a distorted shape and will not return to its original shape. C. It is inferior in conformability and stretchability because it has no cold resistance. D. In particular, the wearability during winter is extremely poor, and watertightness can hardly be expected. 3. The type in which a rubber plug is fitted into the key hole of the iron lid is a. Sealing only the keyhole has no effect on water entering through the gap between the iron lid and the receiving frame. B. Since there is no packing between the iron lid and the receiving frame, there is a large amount of rattling due to the passage of the vehicle, and this tendency becomes more pronounced over time. C. Of course, mud tends to accumulate in the water receiving groove.

The present application has been made in view of such problems of the conventional technology, and an object of the present application is to provide the following things. Prevents rainwater, mud, etc. flowing into the manhole from the gap between the manhole iron lid and the manhole iron lid receiving frame, and prevents noise caused by rattling between the manhole iron lid and the receiving frame when a vehicle, etc. passes over the manhole iron lid. To prevent. Also, the work of mounting and removing is easy and reliable.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is as follows. That is, the present application is composed of a seal packing main body 2A and a compression rubber ring 2B, and the seal packing main body 2A has an outer circumference substantially the same as the outer circumference of the stepped portion 1E in the known manhole iron lid receiving frame 1A. And a bent portion 2A3 having a substantially U-shaped cross section, which is formed at an inward position of the rubber sheet 2A1 having a flat disk shape and having a contact edge 2A2 with respect to the step portion 1E. The inner peripheral wall of the bent portion 2A3 is provided with a suitable number of protrusions 2A31 vertically inward toward the inside of the manhole, and the outer peripheral wall is vertically protruded toward the outside of the manhole. A suitable number of protrusions 2A32 are provided in a horizontal state in a horizontal direction, and the compression rubber ring 2B has a rubber rod-shaped body 2B1 mounted on the bending portion 2A3 of the seal packing body 2A. Corresponding way constitutes a flat circular ring shape from, and rod-shaped body of the rubber 2B1 is watertight cap manhole iron lid that is configured to a substantially ovoid to fit the bent portion. Further, the seal packing body can be provided with a non-slip design.

[0006]

【Example】

 Examples will be described with reference to the drawings. Reference numeral 1 denotes a known manhole in which the manhole iron cap waterproof cap 2 is used. The manhole iron cap 1A is composed of a manhole iron cap receiving frame 1A and a manhole iron cap 1B detachably attached to the manhole iron cap receiving frame 1A. The receiving frame 1A is composed of a circular ring-shaped horizontal edge 1C and a side wall 1D that is erected on the horizontal edge, and a step 1E is formed on the side wall to receive a manhole iron cover. A water receiving groove 1F having a substantially U-shaped cross section is additionally provided on the inner wall of the. 1G is an opening.

Therefore, the manhole iron lid waterproof cap 2 is composed of a seal packing body 2A and a compression rubber ring 2B. The seal packing body 2A is configured as follows. A flat disk-shaped rubber sheet 2A1 configured to have an outer circumference that is substantially the same as the outer circumference of the stepped portion 1E in the manhole iron lid receiving frame 1A, and an inner edge 2A2 of the rubber sheet that contacts the stepped portion 1E. It is composed of a bent portion 2A3 having a substantially U-shaped cross section formed in one direction, and two upper and lower projections 2A31 project horizontally toward the inside of the manhole on the inner peripheral wall portion of the bent portion 2A3. The upper and lower two projections 2A32 are horizontally provided on the outer peripheral wall toward the outside of the manhole. It should be noted that the number of the protrusions 2A31 and the protrusions 2A32 is two in the upper and lower sides in the illustrated example, but it goes without saying that it can be appropriately increased or decreased.

Further, the compression rubber ring 2B is configured as follows. The rubber rod-shaped body 2B1 is formed into a flat circular ring shape so as to correspond to the bent portion 2A3 of the seal packing body 2A from above, and the rubber rod-shaped body 2B1 is formed into a substantially oval cross section so as to be fitted into the bent portion. ing. The compression rubber ring was made to have an oval cross section, and the one with the larger R was attached so that the ring gradually slips up and comes off due to the vibration of the car passing for a long time. This is to prevent it. Because it is a reverse taper, it becomes more stable when mud or the like is clogged.

It is preferable that the bent portion 2A3 and the rubber rod-shaped body 2B1 have the following dimensions. The length 2A33 of the expanded portion of the bent portion 2A3 is set to 27 mm, and the length 2B2 of the expanded portion of the rubber rod 2B1 is set to 29 mm. In addition, the material used is a natural rubber compound with a special compound that has compressive strain resistance, impact resistance, and water resistance, and is excellent in vibration absorption. The front and back surfaces of the seal packing body are provided with a non-slip design 2A4. This non-slip design 2A4 is configured by projecting a projecting shape 2A41 having a U-shaped cross section downward in a planar rectangular shape. The projecting dimensions are 1 mm x 1 mm and the square dimensions are 20 mm x 20 mm.

The device of the present invention is used as follows. Remove the mud accumulated in the groove and seat of the receiving frame. Insert the bent portion of the seal packing body into the groove of the receiving frame while pressing it by hand. After the seal packing body is mounted, finally, the rubber ring for compression having a larger R is placed in the bent portion by hand and sequentially fitted.

[0011]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. 1. Since it is made of rubber with good elasticity, it is easily attached to the receiving frame and has excellent adhesion. It also has excellent vibration absorption. 2. The seal function is quadruple. That is, the first step is to seal at the joint between the iron lid and the receiving frame, the second step is to fit in the groove of the receiving frame to cover the entire manhole, and the third step is to bend the seal packing body. The sealing property is improved by driving in the compression rubber ring, and in the fourth stage, the two projecting ridges 2A31 and A32 attached to the outer circumference of this bent portion exert a complete sealing effect. 3. Due to excellent workability on site, it is possible to reduce the time required for attachment and detachment. 4. Since it has excellent cold resistance, it does not change its flexibility even during the winter, and it is easy to work. 5. If the seal packing body has a non-slip design, there is no risk of slipping and falling even if you ride on it during work in snow. In addition, when the compression rubber ring is fitted, even if the operator goes up above this, it has sufficient tension to withstand the load at that time and can prevent it from falling into the manhole. Work safety is further enhanced.

[Brief description of drawings]

FIG. 1 is a plan view of a seal packing body.

FIG. 2 is a sectional view taken along line AA.

FIG. 3 is an enlarged view of a main part of the above.

FIG. 4 is a plan view of a compression rubber ring.

FIG. 5 is an enlarged sectional view taken along line BB.

FIG. 6 is an enlarged cross-sectional view of a use state.

FIG. 7 is a vertical cross-sectional view of a main part showing a conventional state.

FIG. 8 is a vertical cross-sectional view of a main part showing a conventional state.

FIG. 9 is an enlarged cross-sectional view showing a state of a non-slip design.

[Explanation of symbols]

 2 Waterproof cap for manhole iron cover 2A Seal packing body 2B Rubber ring for compression

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshikazu Maeda 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Hiroyuki Umemoto 4-26-1, Okuzawa, Otaru-shi Stock Company Mitsuuma

Claims (3)

[Scope of utility model registration request] 1. A seal packing body (2A) and a compression rubber ring (2B), wherein the seal packing body (2A) is a known manhole iron cover frame (1).
A flat disc-shaped rubber sheet (2A1) configured to have an outer periphery that is substantially the same as the outer periphery of the stepped portion (1E) in A).
And a bent portion (2A3) having a substantially U-shaped cross section formed at an inner position of the rubber sheet, the edge (2A2) contacting the stepped portion (1E) being left, and the bent portion ( Two
In the inner peripheral wall portion in A3), a suitable number of protrusions (2A31) are vertically provided in the vertical direction toward the inside of the manhole, and the outer peripheral wall portion in the vertical direction toward the outside of the manhole. An appropriate number of protrusions (2A32) are provided in a horizontal state, and the compression rubber ring (2B) has a rubber rod-like body (2B1) which is placed above the bent portion (2A3) of the seal packing body (2A). The waterproof cap for a manhole iron lid is characterized in that the rubber rod-shaped body (2B1) has a substantially oval cross section so as to fit into the bent portion. 2. The watertight cap for a manhole iron lid according to claim 1, wherein the projection (2A31) and the projection (2A32) have two upper and lower portions. 3. The waterproof cap for a manhole iron lid according to claim 1 or 2, wherein the seal packing body has a non-slip design.