JPH0544630Y2 - - Google Patents
Info
- Publication number
- JPH0544630Y2 JPH0544630Y2 JP1987171101U JP17110187U JPH0544630Y2 JP H0544630 Y2 JPH0544630 Y2 JP H0544630Y2 JP 1987171101 U JP1987171101 U JP 1987171101U JP 17110187 U JP17110187 U JP 17110187U JP H0544630 Y2 JPH0544630 Y2 JP H0544630Y2
- Authority
- JP
- Japan
- Prior art keywords
- fitting
- locking
- fitting part
- retaining
- locking portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229920003002 synthetic resin Polymers 0.000 claims description 6
- 239000000057 synthetic resin Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000003566 sealing material Substances 0.000 description 10
- 239000003673 groundwater Substances 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、例えば電線やケーブル等の保護管を
はじめ広範に用いられる伸縮性および可撓性を有
する螺旋管に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a stretchable and flexible spiral tube that is widely used, for example, as a protective tube for electric wires and cables.
（従来の技術）
この種螺旋管としては、例えば実開昭52−
96414号公報に所載のものが知られている。その
螺旋管は、第８図に示すように、一側縁に、二股
状で且つ開口端内縁に抜止部ｂ，ｂが対設された
嵌合部ａを有し、他側縁に、該嵌合部ａ内に摺動
可能に嵌入係止される係止部ｃを有する帯状の合
成樹脂製プロフアイルｄを、螺旋状に巻回すると
ともに、巻回状態において互いに隣合う前記嵌合
部ａと係止部ｃとを嵌合させて筒状に形成してな
り、係止部ｃには軟質シール材ｅをラミネートす
る一方、前記抜止部ｂ，ｂの対向面には鋸歯状凹
凸ｆ，ｆを形成したものである。そして、このよ
うになる螺旋管は、係止部ｃを嵌合部ａ内におい
て管の軸方向にスライドさせることにより伸縮さ
せたり曲げたりすることができ、また、係止部ｃ
を嵌合部ａ内において管の周方向にスライドさせ
ることにより管径を自由に変化させることがで
き、さらには係止部ｃに設けた軟質シール材ｅが
嵌合部ａの内壁面と気密的に接するとともに、該
軟質シール材ｅが抜止部ｂ，ｂの鋸歯状凹凸ｆ，
ｆに食い込むことによつて、水密性、気密性を得
ることができるものである。(Prior art) As this type of spiral tube, for example,
The one published in Publication No. 96414 is known. As shown in FIG. 8, the spiral tube has a fitting part a on one side edge that is bifurcated and has a retaining part b disposed oppositely on the inner edge of the open end, and has a fitting part a on the other side edge. A band-shaped synthetic resin profile d having a locking part c that is slidably fitted and locked into the fitting part a is wound in a spiral shape, and the fitting parts are adjacent to each other in the wound state. A and a locking part c are fitted together to form a cylindrical shape, and the locking part c is laminated with a soft sealing material e, while the opposing surfaces of the retaining parts b and b are provided with serrated irregularities f. , f. Such a spiral tube can be expanded and contracted or bent by sliding the locking portion c in the axial direction of the tube within the fitting portion a, and the locking portion c
The diameter of the pipe can be changed freely by sliding it in the circumferential direction of the pipe within the fitting part a, and the soft sealing material e provided in the locking part c forms an airtight seal with the inner wall surface of the fitting part a. At the same time, the soft sealing material e is in contact with the sawtooth-like unevenness f of the retaining portion b,
By cutting into f, watertightness and airtightness can be achieved.
（考案が解決しようとする問題点）
しかしながら、上記従来の螺旋管にあつては次
のような問題があつた。(Problems to be Solved by the Invention) However, the conventional spiral tube described above has the following problems.
すなわち、軟質シール材ｅの塗布量が不足して
いたり塗布ムラがあつたりした場合、また地下へ
の埋設作業中に嵌合部ａの抜止部ｂ，ｂと軟質シ
ール材ｅとの間に土砂が侵入したりした場合に、
軟質シール材ｅの止水機能が損なわれ、地下水等
が外周側の抜止部ｂと軟質シール材ｅとの間から
嵌合部ａ内を経て管内部に浸入してしまうといつ
た問題があつた。また、たとえ外周側の抜止部ｂ
と軟質シール材ｅとの間から浸入した地下水等を
嵌合部ａの外周側の内壁面と軟質シール材ｅとの
接触部で阻止することができたとしても、浸入し
た地下水等が該内壁面と係止部ｃとの間の空間内
を管周りに流れ、この螺旋管と継手部材（螺旋管
と他の管とを接続する部材）との接続部分から管
内部に浸入してしまうといつた問題があつた。 In other words, if the amount of soft sealing material e applied is insufficient or the application is uneven, or if dirt or sand is deposited between the retaining parts b, b of fitting part a and the soft sealing material e during underground burying work. In case of intrusion,
There is a problem that the water stop function of the soft sealing material e is impaired, and groundwater etc. can enter the inside of the pipe from between the retaining part b on the outer circumferential side and the soft sealing material e through the inside of the fitting part a. Ta. In addition, even if the retaining part b on the outer circumferential side
Even if it is possible to prevent groundwater, etc. from entering between the space between If it flows around the pipe in the space between the wall surface and the locking part c and enters the inside of the pipe from the connection part between the spiral pipe and the coupling member (the member that connects the spiral pipe and another pipe). I had a problem.
また、地下埋設後、年数が経つにつれて特に外
周側において露出している軟質シール材ｅが劣化
し、上述の場合と同様に管内部に地下水等が浸入
するといつた問題があつた。 Furthermore, as years passed after the pipe was buried underground, the soft sealing material e exposed particularly on the outer circumferential side deteriorated, causing problems such as groundwater etc. infiltrating into the pipe as in the case described above.
さらに、係止部ｃにラミネートされた軟質シー
ル材ｅに、嵌合部ａの抜止部ｂ，ｂに形成された
鋸歯状凹凸ｆ，ｆを食い込ませることにより、抜
止部ｂ，ｂと係止部ｃとの接触部分における止水
性を図つているが、上記食い込みの度合は軟質シ
ール材ｅの厚みや材質でのみ決定されるものであ
るから、軟質シール材ｅに前記したような不都合
（塗布ムラや経時劣化等）があると、所期の止水
性を得ることができないといつた問題があつた。 Furthermore, by making the soft sealing material e laminated on the locking part c bite into the serrated irregularities f, f formed on the locking parts b, b of the fitting part a, the locking parts b, b are locked. Although water-tightness is attempted at the contact area with part c, the degree of the above-mentioned intrusion is determined only by the thickness and material of the soft sealing material e. There was a problem that if there was unevenness or deterioration over time, it would not be possible to obtain the desired water-stopping properties.
（問題点を解決するための手段）
本考案に係る螺旋管は、偏平部の一側縁に、二
股状で且つ開口端内縁に抜止部が対設されるとと
もに該開口端に向かうにつれて漸次幅狭となされ
て、該対設する抜止部の間隙が該偏平部の厚さよ
りも狭くなされた嵌合部を有し、他側縁に、該嵌
合部内に摺動可能に嵌入係止される係止部を有す
帯状の合成樹脂製プロフアイルが、螺旋状に巻回
されるとともに該巻回状態において互いに隣合う
前記嵌合部と係止部とが嵌合され筒状に形成され
てなり、前記嵌合部の復元力により前記係止部が
前記係止部で挾圧されるようになされたものであ
る。(Means for Solving the Problems) The spiral tube according to the present invention has a bifurcated shape on one side edge of the flat portion, and a retaining portion is provided oppositely on the inner edge of the opening end, and the width gradually increases toward the opening end. It has a fitting part which is made narrow so that the gap between the opposing retaining parts is narrower than the thickness of the flat part, and is slidably fitted and locked into the fitting part on the other side edge. A band-shaped synthetic resin profile having a locking portion is wound spirally, and in the wound state, the fitting portion and the locking portion that are adjacent to each other are fitted to form a cylindrical shape. The locking portion is clamped by the locking portion due to the restoring force of the fitting portion.
（作用）
嵌合部がその開口端に向かうにつれて漸次幅狭
となされていることによつて、抜止部の間隙が該
偏平部の厚さよりも狭くなされているため、嵌合
部内に係止部が嵌入されると、嵌合部の復元力に
より係止部が嵌合部の抜止部で挾圧され、その結
果係止部と抜止部との接触が密となり、この接触
部分での水密性および気密性が高いものとなる。(Function) Since the width of the fitting part is gradually narrowed toward the open end, the gap between the retaining parts is narrower than the thickness of the flat part, so that a locking part is formed in the fitting part. When the locking part is inserted, the restoring force of the fitting part presses the locking part against the locking part of the fitting part, resulting in tight contact between the locking part and the locking part, and this contact area becomes watertight. and highly airtight.
（実施例）
以下、本考案の一実施例を図面を参照して説明
する。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図は、本考案に係る螺旋管を構成する合成
樹脂製プロフアイル１を示す部分斜視図、第２図
は螺旋管の部分断面図である。 FIG. 1 is a partial perspective view showing a synthetic resin profile 1 constituting a helical tube according to the present invention, and FIG. 2 is a partial sectional view of the helical tube.
プロフアイル１は、第１図に示すように、一側
縁に、二股状で且つ開口端内縁に抜止部２１，２
１が対設されるとともに該開口端に向かうにつれ
て漸次幅狭となされた嵌合部２を有し、他側縁
に、該嵌合部２内に摺動可能に嵌入係止される係
止部３を有する帯状のものである。 As shown in FIG. 1, the profile 1 has a bifurcated shape on one side edge and a retaining portion 21, 2 on the inner edge of the opening end.
1 are arranged opposite to each other and have a fitting part 2 whose width becomes gradually narrower toward the opening end, and a locking part that is slidably fitted and locked into the fitting part 2 on the other side edge. It is a band-shaped thing having part 3.
ここで上記嵌合部２の形状をより詳しく説明す
ると、嵌合部２は、係止部３が嵌入されると、そ
の対片２２，２２が略平行となるようになされて
おり、該嵌入時における対片２２，２２の幅を
Ｘ、また開口端の幅をＹとし、さらに係止部３の
偏平部３１の肉厚をＺとしたとき、嵌合部２に係
止部３を嵌入していない状態においてＸ＞Ｙ（≧
Ｘ−Ｚ）となるような関係を満足し、且つ嵌合部
２に係止部３を嵌入した状態においてＸ＝Ｙとな
るような関係をも満足するような形状となされて
いる。 Here, to explain the shape of the fitting part 2 in more detail, the fitting part 2 is configured so that when the locking part 3 is fitted, the paired pieces 22, 22 become substantially parallel. When the width of the paired pieces 22, 22 is X, the width of the opening end is Y, and the thickness of the flat part 31 of the locking part 3 is Z, the locking part 3 is fitted into the fitting part 2. X>Y(≧
The shape is such that it satisfies the relationship such that X-Z), and also satisfies the relationship that X=Y when the locking portion 3 is fitted into the fitting portion 2.
このような形状を有するプロフアイル１は、例
えば熱可塑性合成樹脂材を押出成形することによ
り連続的に製造される。そして、以上のようにな
るプロフアイル１を、螺旋状に巻回するとともに
該巻回状態において互いに隣合う嵌合部２と係止
部３とを嵌合し筒状に形成することにより、本考
案の螺旋管が製管される（第２図参照）。このよ
うになる螺旋管は、プロフアイル１が上記したよ
うな形状を有しているので、嵌合部２内に係止部
３が嵌入されると、嵌合部２の復元力、つまり対
片２２，２２の閉じようとする力により係止部３
の偏平部３１が嵌合部２の抜止部２１，２１で挾
圧され、その結果偏平部３１と抜止部２１，２１
との接触が密となり、この接触部分での水密性お
よび気密性が高いものとなつている。 The profile 1 having such a shape is continuously manufactured, for example, by extrusion molding a thermoplastic synthetic resin material. Then, by winding the profile 1 as described above in a spiral shape and fitting the fitting portion 2 and the locking portion 3 which are adjacent to each other in the wound state, the profile 1 is formed into a cylindrical shape. The invented spiral tube is manufactured (see Figure 2). Since the profile 1 of this spiral tube has the shape described above, when the locking part 3 is fitted into the fitting part 2, the restoring force of the fitting part 2, that is, the resistance to Due to the force of the pieces 22, 22 trying to close, the locking portion 3
The flat part 31 of the fitting part 2 is clamped by the retaining parts 21, 21, and as a result, the flat part 31 and the retaining parts 21, 21
This makes the contact area very close, and this contact area has high watertightness and airtightness.
第２図において、図中の符号４は、嵌合部２内
において係止部３と抜止部２１，２１との間に形
成される螺旋状の空間内に介装された、例えばゴ
ム製の止水材である。この止水材４，４は、前記
プロフアイル１を螺旋状に巻回して嵌合部２内に
係止部３を嵌入するのと同時に嵌合部２内に押し
込まれる。このように止水材４，４を上記空間内
に介装することにより、万一管の外周側に位置す
る嵌合部２の抜止部２１と係止部３の偏平部３１
との接触部分から地下水等が浸入しても、これを
嵌合部２内において阻止することができ、水密性
および気密性を向上させることができる。 In FIG. 2, reference numeral 4 denotes a rubber-made, for example, spiral space formed between the locking part 3 and the retaining parts 21, 21 in the fitting part 2. It is a waterproof material. The water stop materials 4, 4 are pushed into the fitting part 2 at the same time as the profile 1 is spirally wound and the locking part 3 is fitted into the fitting part 2. By interposing the water-stopping materials 4, 4 in the above-mentioned space in this way, in the unlikely event that the retaining part 21 of the fitting part 2 and the flat part 31 of the locking part 3 located on the outer peripheral side of the pipe
Even if groundwater or the like infiltrates through the contact portion, this can be prevented within the fitting portion 2, and watertightness and airtightness can be improved.
ところで、止水材４を設ける手段は、上記した
ような例に限るものではなく、例えば第３図乃至
第７図に示すような手段であつてもよい。 By the way, the means for providing the water stop material 4 is not limited to the example described above, and may be, for example, means as shown in FIGS. 3 to 7.
第３図に示すものは、止水材４を、嵌合部２の
抜止部２１，２１における係止部３の偏平部３１
との接触部分にライニングしたものである。この
ライニングの手段としては、プロフアイル１の押
出成形時に、止水材４を所定の位置に配してプロ
フアイル１と同時に押し出せばよく、止水材４の
厚みとしては数mm程度でよい。この例の場合、嵌
合部２内に係止部３を嵌入すると、止水材４，４
は係止部３の偏平部３１の両面で圧縮されてそれ
自体の弾性力を発揮し、これによつて、止水材
４，４と係止部３の偏平部３１との接触が非常に
緊密となり、該接触部分における水密性および気
密性がさらに高いものとなる。 What is shown in FIG.
The contact area is lined. This lining can be achieved by placing the water stop material 4 at a predetermined position and extruding it simultaneously with the profile 1 during extrusion molding of the profile 1, and the thickness of the water stop material 4 may be approximately several mm. . In this example, when the locking part 3 is fitted into the fitting part 2, the water stop material 4, 4
is compressed on both sides of the flat part 31 of the locking part 3 and exerts its own elastic force, thereby making the contact between the waterproof materials 4, 4 and the flat part 31 of the locking part 3 very strong. The contact area becomes tighter and has even higher watertightness and airtightness in the contact area.
第４図に示すものは、嵌合部２の抜止部２１，
２１同士の対向面の一部にのみ止水材４，４が露
出するように止水材４，４をライニングしたもの
である。止水材４，４をこのように抜止部２１，
２１にライニングしたことにより、係止部３の偏
平部３１の両面は、止水材４，４と接触すると同
時に、抜止部２１，２１の対向面自体とも接触す
ることになり、該接触部分における止水材４，４
と係止部３の偏平部３１との摩擦力が、第３図で
示した実施例のものよりも小さくなる。その結
果、係止部３のスライド動作が、第３図で示した
実施例のものに比べてやや容易となる。 What is shown in FIG. 4 is the retaining part 21 of the fitting part 2,
The water stop materials 4, 4 are lined so that only a part of the facing surfaces of the 21 are exposed. The water stop material 4, 4 is attached to the stopper part 21 in this way,
21, both sides of the flat part 31 of the locking part 3 come into contact with the waterproof materials 4, 4, and at the same time contact with the facing surfaces of the retaining parts 21, 21 themselves. Water stop material 4, 4
The frictional force between the locking portion 3 and the flat portion 31 of the locking portion 3 is smaller than that in the embodiment shown in FIG. As a result, the sliding movement of the locking portion 3 is somewhat easier than in the embodiment shown in FIG.
第５図に示すものは、嵌合部２の抜止部２１，
２１同士の対向面の適所に断面が略円形（図では
圧縮されているために半円形となつている）の止
水材４，４を設けたものである。 What is shown in FIG. 5 is the retaining part 21 of the fitting part 2,
Water-stopping materials 4, 4 each having a substantially circular cross section (in the figure, it is semi-circular because it is compressed) are provided at appropriate locations on the opposing surfaces of the two.
第６図に示すものは、嵌合部２の内面に止水材
４を設けたものである。 In the one shown in FIG. 6, a water stop material 4 is provided on the inner surface of the fitting part 2.
第７図に示すものは、係止部３の嵌合部２の内
壁面と接触する部分に止水材４，４を設けたもの
である。 In the one shown in FIG. 7, water-stopping materials 4, 4 are provided at the portion of the locking portion 3 that comes into contact with the inner wall surface of the fitting portion 2.
（考案の効果）
以上説明したように、本考案の螺旋管は、嵌合
部を開口端に向かうにつれて漸次幅狭となすこと
によつて、抜止部の間隙が該偏平部の厚さよりも
狭くなり、嵌合部の復元力により係止部が嵌合部
の抜止部で挾圧されるようになされたものである
から、管の全長にわたつて地下水等の浸入を抜止
部と係止部との間で確実に阻止することができ、
地下水等が嵌合部内を通過して管内部に浸入する
といつたことがないのは勿論のこと、嵌合部内に
おける抜止部と係止部との間の空間に地下水等が
浸入し、それが管周りに流れて管の端部から管内
部に浸入するといつたことがまつたくない。した
がつて、螺旋管内の電線やケーブル等を安全に保
護することができる。(Effect of the invention) As explained above, in the spiral tube of the invention, by making the fitting part gradually narrower toward the open end, the gap at the retaining part is narrower than the thickness of the flat part. The restoring force of the fitting part causes the locking part to be compressed by the locking part of the fitting part, so it prevents infiltration of groundwater etc. over the entire length of the pipe between the locking part and the locking part. It can be reliably prevented between
It goes without saying that groundwater, etc. has never passed through the fitting part and entered the inside of the pipe, but it has never happened that groundwater, etc. has entered the space between the retaining part and the locking part in the fitting part. I don't want to get injured if it flows around the pipe and enters the inside of the pipe from the end of the pipe. Therefore, the electric wires, cables, etc. inside the spiral tube can be safely protected.
また、プロフアイルは単に押出成形することに
より製造することができるとともに、これを巻回
して隣接する嵌合部と係止部とを嵌合させるだけ
で製管することができるので、生産性にも優れて
いる。 In addition, the profile can be manufactured simply by extrusion molding, and the pipe can be made by simply winding the profile and fitting adjacent fitting parts and locking parts, which improves productivity. is also excellent.
第１図は本考案に係る螺旋管を構成する合成樹
脂製プロフアイルの一実施例を示す斜視図、第２
図は本考案に係る螺旋管の一実施例を示す部分断
面図、第３図乃至第７図はそれぞれ本考案に係る
螺旋管の他の実施例を示す部分断面図、第８図は
従来の螺旋管を示す部分断面図である。
１……プロフアイル、２……嵌合部、２１……
抜止部、３係止部、４……止水材。
Fig. 1 is a perspective view showing one embodiment of a synthetic resin profile constituting a spiral tube according to the present invention;
The figure is a partial cross-sectional view showing one embodiment of the spiral tube according to the present invention, FIGS. 3 to 7 are partial cross-sectional views showing other examples of the spiral tube according to the present invention, and FIG. It is a partial sectional view showing a spiral tube. 1... Profile, 2... Fitting portion, 21...
Retaining part, 3 locking part, 4... water stop material.
Claims (1)
抜止部が対設されるとともに該開口端に向かうに
つれて漸次幅狭となされて、該対設する抜止部の
間隙が該偏平部の厚さよりも狭くなされた嵌合部
を有し、他側縁に、該嵌合部内に摺動可能に嵌入
係止される係止部を有す帯状の合成樹脂製プロフ
アイルが、螺旋状に巻回されるとともに該巻回状
態において互いに隣合う前記嵌合部と係止部とが
嵌合され筒状に形成されてなり、前記嵌合部の復
元力により前記係止部が前記係止部で挾圧される
ようになされたことを特徴とする螺旋管。 A bifurcated retaining part is provided on one side edge of the flat part and facing the inner edge of the opening end, and the width becomes gradually narrower toward the opening end, so that the gap between the opposing retaining parts is the same as that of the flat part. A band-shaped synthetic resin profile having a fitting part narrower than the thickness and having a locking part on the other side edge that is slidably inserted and locked into the fitting part is spirally shaped. The fitting portion and the locking portion that are adjacent to each other in the wound state are fitted into each other to form a cylindrical shape, and the restoring force of the fitting portion causes the locking portion to close to the locking portion. A helical tube characterized in that it is clamped at two parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987171101U JPH0544630Y2 (en) | 1987-11-09 | 1987-11-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987171101U JPH0544630Y2 (en) | 1987-11-09 | 1987-11-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0175670U JPH0175670U (en) | 1989-05-23 |
| JPH0544630Y2 true JPH0544630Y2 (en) | 1993-11-12 |
Family
ID=31462626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987171101U Expired - Lifetime JPH0544630Y2 (en) | 1987-11-09 | 1987-11-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0544630Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5897338B2 (en) * | 2012-01-19 | 2016-03-30 | タイガースポリマー株式会社 | Synthetic resin flexible tube |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5135286B2 (en) * | 1972-03-17 | 1976-10-01 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5135286U (en) * | 1974-09-03 | 1976-03-16 | ||
| JPS5272913U (en) * | 1975-11-27 | 1977-05-31 | ||
| JPS5296412U (en) * | 1976-01-19 | 1977-07-19 | ||
| JPS55122583U (en) * | 1979-02-22 | 1980-08-30 |
-
1987
- 1987-11-09 JP JP1987171101U patent/JPH0544630Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5135286B2 (en) * | 1972-03-17 | 1976-10-01 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0175670U (en) | 1989-05-23 |
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