JP4964667B2 - Lid with excessive internal pressure release valve - Google Patents
Lid with excessive internal pressure release valve Download PDFInfo
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- JP4964667B2 JP4964667B2 JP2007130127A JP2007130127A JP4964667B2 JP 4964667 B2 JP4964667 B2 JP 4964667B2 JP 2007130127 A JP2007130127 A JP 2007130127A JP 2007130127 A JP2007130127 A JP 2007130127A JP 4964667 B2 JP4964667 B2 JP 4964667B2
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本発明は、過大内圧解放弁付き蓋に係り、特に、蓋の内部と外部との差圧によって蓋が飛ばされる恐れがあるトラフ蓋やマンホール蓋に関するものである。 The present invention relates to a lid with an excessive internal pressure release valve, and more particularly to a trough lid or a manhole lid where the lid may be blown by a differential pressure between the inside and the outside of the lid.
従来、鉄道線路の沿線には、図１１，図１２に示すように、電力ケーブルや信号ケーブルなど多種の配線を収納し保護するため、トラフと呼ばれるコンクリート製のＵ型側溝が設置されている。なお、図１１はトラフが閉じている状態が、図１２はトラフが開いている状態が示されている。
通常、トラフはむき出しではなく、トラフ内にゴミや動物等が入らないように、また、沿線巡回時の通路として、トラフの上面はコンクリート製の蓋で覆われている。ただし、トラフ内の点検・配線交換等の作業性を考慮して、トラフの蓋は人力で取り外し・取り付けできる程度の大きさに分割されたものが、連続的に設置される。
Conventionally, as shown in FIG. 11 and FIG. 12, concrete U-shaped side grooves called troughs are installed along the railroad tracks in order to accommodate and protect various wirings such as power cables and signal cables. FIG. 11 shows a state where the trough is closed, and FIG. 12 shows a state where the trough is open.
Normally, the trough is not exposed, and the upper surface of the trough is covered with a concrete lid so that dirt, animals, etc. do not enter the trough, and as a passage when traveling along the line. However, in consideration of workability such as inspection and wiring replacement in the trough, the trough lid is divided and installed so that it can be removed and attached manually.
現在では、鉄道線路沿いのＵ字形側溝の蓋として、運搬時には軽量で、設置後は列車通過時に移動し飛ばされない重量に調整され、かつひび割れや欠損を生じない側溝用蓋が提案されている（特許文献１参照）。
また、ボール逆止弁とこれを用いた排水制御装置が提案されている（特許文献２参照）。
A ball check valve and a drainage control device using the ball check valve have been proposed (see Patent Document 2).
上記したトラフの蓋は、トラフの近傍を高速で列車が通過することで生じる風圧や圧力変化、さらには天候（台風などによって生じる強風）などの外部要因によって、外れる恐れがある。
図１３はトラフの蓋の上下面に作用する圧力変化から求めた差圧の実測例を示す図である。
The above-mentioned trough lid may come off due to external factors such as wind pressure and pressure changes caused by high-speed train passing in the vicinity of the trough, and weather (strong wind caused by typhoons).
FIG. 13 is a diagram illustrating an actual measurement example of the differential pressure obtained from the pressure change acting on the upper and lower surfaces of the trough lid.
列車１０１がトラフの近傍を通過することで、トラフの蓋の上下面には、図１３のような差圧が瞬間的に生じる。特に、この例では、列車の後尾側が通過する際に、トラフの蓋を浮き上がらせる方向（差圧が正）の大きな力となっている。
一方、蓋は自重によって浮き上がる力と対抗している。すなわち、蓋が浮き上がる限界の差圧ΔＰは、以下のように求められる。
As the train 101 passes in the vicinity of the trough, a differential pressure as shown in FIG. 13 is instantaneously generated on the upper and lower surfaces of the trough lid. In particular, in this example, when the rear side of the train passes, there is a large force in the direction of raising the trough lid (the differential pressure is positive).
On the other hand, the lid counters the force that rises due to its own weight. That is, the limit differential pressure ΔP at which the lid is lifted is obtained as follows.
ΔＰ＞Ｍｇ／Ｓ＝１３×９．８／０．１２５≒１（ｋＰａ）
ただし、Ｍは蓋の質量、ｇは重力加速度、Ｓは蓋の表面積であり、実際の値は蓋の条件によって異なる。
上記式から、図１３に示した蓋の例では、列車の後尾通過時に生じる１ｋＰａ以上の差圧によって蓋が浮き上がると見積もられ、実際に飛散した箇所の蓋とも符号した。
ΔP> Mg / S = 13 × 9.8 / 0.125≈1 (kPa)
However, M is the mass of the lid, g is the acceleration of gravity, S is the surface area of the lid, and the actual value varies depending on the conditions of the lid.
From the above formula, in the example of the lid shown in FIG. 13, it is estimated that the lid is lifted by a differential pressure of 1 kPa or more generated when the train passes the tail, and it is also referred to as a lid at the place where it is actually scattered.
また、道路に敷設されるマンホールの蓋は、大雨時に急激に排水路へ流れ込んだ水流によって引き起こされる空圧や溢れ出す水の水圧により外れる恐れがある。
本発明は、上記状況に鑑みて、地上に配置されるトラフの蓋やマンホールの蓋が風圧、強風や水圧などの外部要因によって容易に外れないようにした、過大内圧解放弁付き蓋を提供することを目的とする。
In addition, the manhole cover laid on the road may come off due to the air pressure caused by the water flow suddenly flowing into the drainage channel during heavy rain or the overflowing water pressure.
The present invention is, in view of the above situation, and to prevent removal to easily by external factors of the trough lid or manhole cover disposed on the ground wind pressure, etc. strong winds and pressure, with excess pressure relief valve cover The purpose is to provide.
本発明は、上記目的を達成するために、
〔１〕過大内圧解放弁付き蓋について、地上に配置される蓋と、この蓋の一部に構築される過大内圧解放弁とを備え、前記蓋は円環状の段部とこの円環状の段部の中央側に円形の開口を備え、前記過大内圧解放弁は開口を有する円環状下部弁部材と、円盤状の上部弁部材と、前記円環状下部弁部材と前記円盤状の上部弁部材を繋ぐ棒状部材とを有し、前記過大内圧解放弁は外部要因の消滅により原状に復帰する復帰手段を具備することを特徴とする。
In order to achieve the above object, the present invention provides
[1] A lid with an excessive internal pressure release valve is provided with a lid arranged on the ground and an excessive internal pressure release valve constructed at a part of the lid, and the lid has an annular step portion and the annular step. A circular opening on the center side of the part, and the excessive internal pressure release valve has an annular lower valve member having an opening, a disk-shaped upper valve member, the annular lower valve member, and the disk-shaped upper valve member. The excessive internal pressure release valve is provided with return means for returning to the original state due to the extinction of external factors.
〔２〕上記〔１〕記載の過大内圧解放弁付き蓋において、前記復帰手段が過大内圧解放弁の自重であることを特徴とする。
〔３〕上記〔１〕記載の過大内圧解放弁付き蓋において、前記復帰手段が前記蓋の円環状の段部の下面と前記円環状下部弁部材の表面との間に配置される弾性体であることを特徴とする。
[2] The lid with an excessive internal pressure release valve according to [1], wherein the return means is a dead weight of the excessive internal pressure release valve.
[3] In the lid with an excessive internal pressure release valve according to [1], the return means is an elastic body disposed between the lower surface of the annular step portion of the lid and the surface of the annular lower valve member. It is characterized by being.
〔４〕上記〔１〕記載の過大内圧解放弁付き蓋において、前記蓋の円環状の段部の下面に円環状の座金を配置し、この円環状の座金と前記円環状下部弁部材の表面との間にコイルスプリングを配置することを特徴とする。
〔５〕上記〔１〕から〔４〕の何れか一項記載の過大内圧解放弁付き蓋において、前記棒状部材は少なくともその外表面に潤滑処理を施した棒状部材であることを特徴とする。
[4] The lid with an excessive internal pressure release valve according to [1] above, wherein an annular washer is disposed on the lower surface of the annular step portion of the lid, and the annular washer and the surface of the annular lower valve member A coil spring is disposed between the two.
[5] The lid with an excessive internal pressure release valve according to any one of [1] to [4], wherein the rod-shaped member is a rod-shaped member having at least an outer surface subjected to a lubrication treatment.
〔６〕上記〔５〕記載の過大内圧解放弁付き蓋において、前記潤滑処理がテフロン（登録商標）処理であることを特徴とする。 [6] The lid with an excessive internal pressure release valve according to [5], wherein the lubricating treatment is a Teflon (registered trademark) treatment.
本発明によれば、地上に配置されるトラフの蓋やマンホールの蓋が風圧、天候や水圧などの外部要因によって容易に外れないようにした、過大内圧解放弁付き蓋を提供する。特に、過大内圧解放弁が開いた状態になっても、過大内圧解放弁が開く要因となった外部要因が消滅すると自動的に原状に復帰することができ、安全である。 According to the present invention, the trough lid or manhole cover disposed on the ground wind pressure, depending on external factors such as weather and water pressure was not allowed to come off easily, provides with excessive pressure release valve lid. In particular, even in a state in which excessive pressure release valve is opened, can be external factors that caused to open excessive pressure release valve is automatically returns to the original state when disappear, it is safe.
本発明の過大内圧解放弁付き蓋は、地上に配置される蓋と、この蓋の一部に構築される過大内圧解放弁とを備え、前記蓋は円環状の段部と該円環状の段部の中央側に円形の開口を備え、前記過大内圧解放弁は開口を有する円環状下部弁部材と、円盤状の上部弁部材と、前記円環状下部弁部材と前記円盤状の上部弁部材を繋ぐ棒状部材とを有し、前記過大内圧解放弁は外部要因の消滅により原状に復帰する復帰手段を具備する。 The lid with an excessive internal pressure release valve of the present invention includes a lid disposed on the ground and an excessive internal pressure release valve constructed in a part of the lid, and the lid is formed with an annular step portion and the annular step. A circular opening on the center side of the part, and the excessive internal pressure release valve has an annular lower valve member having an opening, a disk-shaped upper valve member, the annular lower valve member, and the disk-shaped upper valve member. The excessive internal pressure release valve includes a return means that returns to its original state when extrinsic factors are extinguished.
以下、本発明の実施の形態について詳細に説明する。
図１は本発明の第１実施例を示す過大内圧解放弁付き蓋の斜視図、図２はその過大内圧解放弁付き蓋の過大内圧解放弁が閉まっている状態を示す図、図３はその過大内圧解放弁付き蓋の過大内圧解放弁が上昇して開いている状態を示す図、図４は過大内圧解放弁の斜視図である。
Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a perspective view of a lid with an excessive internal pressure release valve showing a first embodiment of the present invention, FIG. 2 is a view showing a state in which the excessive internal pressure release valve of the lid with an excessive internal pressure release valve is closed, and FIG. FIG. 4 is a perspective view of the excessive internal pressure release valve, showing a state where the excessive internal pressure release valve of the lid with the excessive internal pressure release valve is lifted and opened.
これらの図において、１は蓋であり、この蓋１には円環状の段部２とその内側には蓋の円形の開口３が形成されている。
一方、図４に示すように、蓋１の円環状の段部２とその内側には円形の開口３とに対応するように、過大内圧解放弁１０が設けられている。この過大内圧解放弁１０は開口１１Ａを有し、円環状下部弁部材（重量のある金属部材又はコンクリート部材）１１と円盤状の上部弁部材（重量のある金属部材又はコンクリート部材）１２と、円環状下部弁部材１１と円盤状の上部弁部材１２を繋ぐ棒状部材１３から構成されている。
In these drawings, reference numeral 1 denotes a lid, which is formed with an annular step portion 2 and a circular opening 3 of the lid inside.
On the other hand, as shown in FIG. 4, an excessive internal pressure release valve 10 is provided so as to correspond to the annular step portion 2 of the lid 1 and the circular opening 3 inside thereof. The excessive internal pressure release valve 10 has an opening 11A, an annular lower valve member (heavy metal member or concrete member) 11, a disk-shaped upper valve member (heavy metal member or concrete member) 12, and a circular shape. It is comprised from the rod-shaped member 13 which connects the cyclic | annular lower valve member 11 and the disk shaped upper valve member 12. FIG.
そこで、図２に示すように、通常は、蓋１の円環状の段部２に過大内圧解放弁１０の上部弁部材１２の円周下部１２Ａが係合されており、蓋１の円形の開口３は過大内圧解放弁１０の上部弁部材１２によって閉じられている。
一方、蓋１が設置されているトラフやマンホールの差圧が外部要因により上昇すると、図３に示すように、過大内圧解放弁１０は押し上げられる。すると、過大内圧解放弁１０の円環状下部弁部材１１の上部円周部が蓋１の円形の開口３の下部円周部１Ａに当接して、これ以上過大内圧解放弁１０は外に移動することはない。
Therefore, as shown in FIG. 2, the circular lower portion 12 </ b> A of the upper valve member 12 of the excessive internal pressure release valve 10 is normally engaged with the annular step portion 2 of the lid 1. 3 is closed by the upper valve member 12 of the excessive internal pressure release valve 10.
On the other hand, when the differential pressure of the trough or manhole where the lid 1 is installed rises due to an external factor, the excessive internal pressure release valve 10 is pushed up as shown in FIG. Then, the upper circumferential portion of the annular lower valve member 11 of the excessive internal pressure release valve 10 comes into contact with the lower circumferential portion 1A of the circular opening 3 of the lid 1, and the excessive internal pressure release valve 10 moves further beyond. There is nothing.
過大内圧解放弁１０に作用する外部要因が解除されると、過大内圧解放弁１０は、その過大内圧解放弁１０の自重により、図２に示すように、原状に復帰させることができる。
このように、簡便な構造であり、しかも、通常は蓋に配置される過大内圧解放弁は閉じており、ゴミや動物等が入ることもない。
図５は本発明の第２実施例を示す過大内圧解放弁付き蓋の斜視図、図６はその過大内圧解放弁付き蓋の過大内圧解放弁が閉まっている状態を示す図、図７はその過大内圧解放弁付き蓋の過大内圧解放弁が上昇して開いている状態を示す図である。
When the external factor acting on the excessive internal pressure release valve 10 is released, the excessive internal pressure release valve 10 can be returned to the original state as shown in FIG.
In this way, the structure is simple, and the excessive internal pressure release valve that is normally disposed on the lid is closed, so that no dust, animals or the like enter.
5 is a perspective view of a lid with an excessive internal pressure release valve showing a second embodiment of the present invention, FIG. 6 is a diagram showing a state in which the excessive internal pressure release valve of the lid with an excessive internal pressure release valve is closed, and FIG. It is a figure which shows the state which the excessive internal pressure release valve of a lid | cover with an excessive internal pressure release valve raises and opens.
これらの図に示すように、蓋２１の円環状の段部２２とその内側には蓋の円形の開口２３とに対応するように、過大内圧解放弁３０が設けられている。この過大内圧解放弁３０は開口３１Ａを有する円環状下部弁部材３１と円盤状の上部弁部材３２と、円環状下部弁部材３１と円盤状の上部弁部材３２を繋ぐ表面潤滑性を有する棒状部材３３から構成されている。この表面潤滑性を有する棒状部材３３としては、例えばテフロン（登録商標）性棒状部材を用いることができる。 As shown in these drawings, an excessive internal pressure release valve 30 is provided so as to correspond to an annular step portion 22 of the lid 21 and a circular opening 23 of the lid. The excessive internal pressure release valve 30 includes an annular lower valve member 31 having an opening 31A, a disc-like upper valve member 32, and a rod-like member having surface lubricity that connects the annular lower valve member 31 and the disc-like upper valve member 32. 33. As the rod-shaped member 33 having surface lubricity, for example, a Teflon (registered trademark) rod-shaped member can be used.
また、金属棒にテフロン（登録商標）性チューブを被着するようにしてもよい。
図８は本発明の第３実施例を示す過大内圧解放弁付き蓋の斜視図、図９はその過大内圧解放弁付き蓋の過大内圧解放弁が閉まっている状態を示す図、図１０はその過大内圧解放弁付き蓋の過大内圧解放弁が上昇して開いている状態を示す図である。
これらの図に示すように、蓋４１の円環状の段部４２とその内側には蓋の円形の開口４３とに対応するように、過大内圧解放弁５０が設けられている。この過大内圧解放弁５０は開口５１Ａを有する円環状下部弁部材５１と円盤状の上部弁部材５２と、円環状下部弁部材５１と円盤状の上部弁部材５２を繋ぐ棒状部材５３から構成されおり、この棒状部材５３の下部には、円環状座金５４とコイルスプリング５５とが貫通している。
Alternatively, a Teflon (registered trademark) tube may be attached to the metal rod.
FIG. 8 is a perspective view of a lid with an excessive internal pressure release valve showing a third embodiment of the present invention, FIG. 9 is a view showing a state in which the excessive internal pressure release valve of the lid with an excessive internal pressure release valve is closed, and FIG. It is a figure which shows the state which the excessive internal pressure release valve of a lid | cover with an excessive internal pressure release valve raises and opens.
As shown in these drawings, an excessive internal pressure release valve 50 is provided so as to correspond to an annular step portion 42 of the lid 41 and a circular opening 43 of the lid. The excessive internal pressure release valve 50 includes an annular lower valve member 51 having an opening 51A, a disc-like upper valve member 52, and a rod-like member 53 that connects the annular lower valve member 51 and the disc-like upper valve member 52. An annular washer 54 and a coil spring 55 pass through the lower part of the rod-like member 53.
そこで、図９に示すように、通常は、蓋４１の円環状の段部４２に過大内圧解放弁５０の上部弁部材５２の円周下部５２Ａが係合されており、蓋４１の円形の開口４３は過大内圧解放弁５０の円盤状の上部弁部材５２によって閉じられている。
一方、蓋１が設置されているトラフやマンホールの差圧が外部要因により上昇すると、図１０に示すように、過大内圧解放弁５０は押し上げられる。すると、過大内圧解放弁５０の円環状下部弁部材５１の棒状部材５３には円環状座金５４とコイルスプリング５５とが貫通しており、コイルスプリング５５が押し縮められた状態で蓋４１の円形の開口４３の下部円周部４１Ａに当接して、これ以上過大内圧解放弁５０は外に移動することはない。
Therefore, as shown in FIG. 9, normally, the circular lower portion 52 </ b> A of the upper valve member 52 of the excessive internal pressure release valve 50 is engaged with the annular step portion 42 of the lid 41, and the circular opening of the lid 41 is engaged. 43 is closed by a disk-shaped upper valve member 52 of the excessive internal pressure release valve 50.
On the other hand, when the differential pressure of the trough or manhole where the lid 1 is installed rises due to an external factor, the excessive internal pressure release valve 50 is pushed up as shown in FIG. Then, the annular washer 54 and the coil spring 55 penetrate the rod-shaped member 53 of the annular lower valve member 51 of the excessive internal pressure release valve 50, and the lid 41 has a circular shape with the coil spring 55 being compressed. The excessive internal pressure release valve 50 does not move further beyond the lower circumferential portion 41 </ b> A of the opening 43.
過大内圧解放弁５０に作用する外部要因が解除されると、過大内圧解放弁５０は、コイルスプリング５５の圧縮からの解放力により円環状下部弁部材５１は下方に押し戻されて原状に復帰する。
この実施例によれば、その過大内圧解放弁５０の自重に加えて、コイルスプリング５５の圧縮された状態からの解放力により、迅速的確に過大内圧解放弁５０を復帰させることができる。
When the external factor acting on the excessive internal pressure release valve 50 is released, the annular lower valve member 51 is returned to the original state by the downward pressure of the annular lower valve member 51 by the release force from the compression of the coil spring 55.
According to this embodiment, in addition to the excessive weight of the excessive internal pressure release valve 50, the excessive internal pressure release valve 50 can be quickly and accurately returned by the releasing force of the coil spring 55 from the compressed state.
なお、本発明は上記実施例に限定されるものではなく、本発明の趣旨に基づき種々の変形が可能であり、これらを本発明の範囲から排除するものではない。 In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.
本発明の過大内圧解放弁付き蓋は、外部条件により飛ばされることがなく、しかも自動的に元の位置に復帰できる過大内圧解放弁付き蓋として利用可能である。 The lid with an excessive internal pressure release valve of the present invention can be used as a lid with an excessive internal pressure release valve that can be automatically returned to the original position without being blown by an external condition.
１，２１，４１ 蓋
１Ａ，４１Ａ 蓋の円形の開口の下部円周部
２，２２，４２ 円環状の段部
３，２３，４３，５２ 蓋の円形の開口
１０，３０，５０ 過大内圧解放弁
１１，３１，５１ 円環状下部弁部材
１１Ａ，３１Ａ，５１Ａ 円環状下部弁部材の開口
１２，３２，５２ 円盤状の上部弁部材
１２Ａ 円盤状の上部弁部材の円周下部
１３，３３，５３ 棒状部材
５４ 円環状座金
５５ コイルスプリング
５２Ａ 上部弁部材の円周下部
1,21,41 lid
1A, 41A Lower circular part of the circular opening of the lid 2, 22, 42 Circular step 3, 23, 43, 52 Circular opening of the lid 10, 30, 50 Excessive internal pressure release valve 11, 31, 51 yen Annular lower valve member 11A, 31A, 51A Opening of annular lower valve member 12, 32, 52 Disc-shaped upper valve member
12A disk-shaped upper valve member circumferential lower portion 13, 33, 53 rod-shaped member 54 annular washer 55 coil spring 52A upper valve member circumferential lower portion
Claims (6)
（ｂ）該蓋の一部に構築される過大内圧解放弁とを備え、
（ｃ）前記蓋は円環状の段部と該円環状の段部の中央側に円形の開口を備え、前記過大内圧解放弁は開口を有する円環状下部弁部材と、円盤状の上部弁部材と、前記円環状下部弁部材と前記円盤状の上部弁部材を繋ぐ棒状部材とを有し、前記過大内圧解放弁は外部要因の消滅により原状に復帰する復帰手段を具備することを特徴とする過大内圧解放弁付き蓋。 (A) a lid disposed on the ground;
(B) an excessive internal pressure release valve constructed in a part of the lid;
(C) The lid includes an annular step portion and a circular opening at the center of the annular step portion, and the excessive internal pressure release valve has an annular lower valve member having an opening, and a disc-shaped upper valve member. And a rod-shaped member that connects the annular lower valve member and the disk-shaped upper valve member, and the excessive internal pressure release valve includes a return means that returns to its original state due to disappearance of an external factor. Lid with excessive internal pressure release valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007130127A JP4964667B2 (en) | 2007-05-16 | 2007-05-16 | Lid with excessive internal pressure release valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007130127A JP4964667B2 (en) | 2007-05-16 | 2007-05-16 | Lid with excessive internal pressure release valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2008285845A JP2008285845A (en) | 2008-11-27 |
| JP4964667B2 true JP4964667B2 (en) | 2012-07-04 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007130127A Expired - Fee Related JP4964667B2 (en) | 2007-05-16 | 2007-05-16 | Lid with excessive internal pressure release valve |
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| Country | Link |
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| JP (1) | JP4964667B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5480178B2 (en) | 2011-02-07 | 2014-04-23 | 古河電気工業株式会社 | Pit cover laying structure, manufacturing method, and laying method |
| GB2504452B (en) * | 2012-05-30 | 2017-09-06 | Spencer Price Paul | Improvements in and relating to manhole covers |
| CN110512652B (en) * | 2019-08-28 | 2021-04-30 | 安徽普瑞明精密机械有限公司 | Heavy nodular cast iron well lid capable of bearing F900 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53129169U (en) * | 1977-03-23 | 1978-10-13 | ||
| JPS61112519A (en) * | 1984-11-02 | 1986-05-30 | 株式会社フジクラ | Support fitting for cable of offset section |
| JPH042214Y2 (en) * | 1986-10-29 | 1992-01-24 | ||
| JPS6381957U (en) * | 1986-11-12 | 1988-05-30 | ||
| JPH0527550Y2 (en) * | 1987-04-15 | 1993-07-14 | ||
| JP2973281B2 (en) * | 1995-12-14 | 1999-11-08 | 株式会社荏原製作所 | Plastic manhole cover |
| JP3482581B2 (en) * | 1995-12-16 | 2003-12-22 | 株式会社浅羽製作所 | Gutter lid |
| JP2001220765A (en) * | 2000-02-08 | 2001-08-17 | Kurimoto Ltd | Manhole cover |
| JP3605726B2 (en) * | 2001-07-18 | 2004-12-22 | 草竹コンクリート工業株式会社 | Lid indicator |
| JP4801299B2 (en) * | 2001-09-26 | 2011-10-26 | 日本鋳鉄管株式会社 | Inner lid for manhole insulation |
| JP4754195B2 (en) * | 2003-08-28 | 2011-08-24 | 株式会社キッツ | Ball check valve and drainage control device using the same |
-
2007
- 2007-05-16 JP JP2007130127A patent/JP4964667B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008285845A (en) | 2008-11-27 |
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