KR20000007507U - Device for connecting underground pipes - Google Patents
Device for connecting underground pipes Download PDFInfo
- Publication number
- KR20000007507U KR20000007507U KR2019990004345U KR19990004345U KR20000007507U KR 20000007507 U KR20000007507 U KR 20000007507U KR 2019990004345 U KR2019990004345 U KR 2019990004345U KR 19990004345 U KR19990004345 U KR 19990004345U KR 20000007507 U KR20000007507 U KR 20000007507U
- Authority
- KR
- South Korea
- Prior art keywords
- heating wire
- resistance heating
- tubes
- electric resistance
- connecting sleeve
- 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.)
- Withdrawn
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 238000012856 packing Methods 0.000 claims abstract description 23
- 229920005989 resin Polymers 0.000 claims abstract description 17
- 239000011347 resin Substances 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000011257 shell material Substances 0.000 claims abstract description 5
- 239000006260 foam Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims 2
- 238000000576 coating method Methods 0.000 claims 2
- 238000000034 method Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 6
- 230000004927 fusion Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009172 bursting Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
- F16L21/002—Sleeves or nipples for pipes of the same diameter; Reduction pieces
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G9/00—Installations of electric cables or lines in or on the ground or water
- H02G9/06—Installations of electric cables or lines in or on the ground or water in underground tubes or conduits; Tubes or conduits therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
본 고안은 주연에 외부나선홈(10)을 갖는 파형관의 형태인 두 관체(12)(14)의 단부를 내경이 이들 관체(12)(14)의 외경보다 크고 내부중간에 내향플랜지(16)를 갖는 짧은 길이의 원통형 연결슬리이브(18)의 양측으로 삽입하여 내향플랜지(16)와 접속되게 연결하는 지중매설관의 연결장치를 제공한다. 본고안에 따라서, 원통형 연결슬리이브(18)에 삽입될 두 관체(12)(14)의 단부에서 그 외부나선홈(10)에 연결슬리이브(18)와 관체(12)(14)의 재질과 동일한 재질로 구성된 기다란 유연성 튜우브(20)내에 가열시 발포팽창성과 동시에 열융착성을 갖는 조성의 수지분말(22)을 채우고 두 외부접속단자(24)(26)가 노출되게 연장되는 전기저항발열선(28)을 삽입하여 양단을 밀봉한 패킹봉체(30)를 원통형 연결슬리이브(18)에 삽입될 두 관체(12)(14)의 단부에서 그 외부나선홈(10)에 수회 감아 두 관체(12)(14)의 단부를 연결슬리이브(18)에 삽입연결하고 전기저항발열선(28)에 전류를 공급시 이 전기저항발열선(28)의 발열로 패킹봉체(30)가 연결슬리이브(18)와 두 관체(12)(14)사이에서 발포팽창되고 열융착될 수 있도록 한다. 패킹봉체(30')가 전기저항발열선(28)에 발포성수지를 외피재형태로 성형하여 구성될 수도 있다.The present invention has an inner diameter larger than the outer diameter of the two tube bodies 12 and 14 in the form of a corrugated tube having an outer spiral groove 10 at its periphery, and an inward flange 16 between the inner and the inner tubes. It is inserted into both sides of the cylindrical connection sleeve 18 having a short length to provide a connection device of the underground buried pipe to be connected to the inward flange 16. According to the present invention, the material of the connecting sleeve 18 and the tubular body 12, 14 at the ends of the two tubular bodies 12, 14 to be inserted into the cylindrical connecting sleeve 18 and its outer spiral groove 10; An electric resistance heating wire which fills the resin powder 22 having a composition of thermal expansion and foamability upon heating in the elongate flexible tubing 20 made of the same material and extends to expose the two external connection terminals 24 and 26. (28) is inserted into the outer sealing groove (10) several times the end of the two tube (12, 14) to be inserted into the cylindrical connection sleeve 18, the packing rod body 30 is sealed both ends (two) 12) The end of the 14 is inserted into the connecting sleeve 18, and when the current is supplied to the electric resistance heating wire 28, the packing rod 30 is heated by the heat generated by the electric resistance heating wire 28, the connection sleeve 18 And foamed expansion and heat fusion between the two tubes (12) (14). The packing rod 30 'may be formed by molding the foamable resin in the form of an outer shell material on the electric resistance heating wire 28.
Description
본 고안은 지중매설관의 연결장치에 관한 것으로, 특히 연결될 두 관체, 예를 들어 파형관체의 양단부가 이들 관체의 외경보다 큰 내경을 갖는 연결슬리이브의 양측으로 삽입되어 연결되는 형태의 지중매설관의 연결장치에 관한 것이다.The present invention relates to a connection device for underground buried pipes, and in particular, two underground pipes to be connected, for example, underground pipes in which both ends of the corrugated pipe are inserted into and connected to both sides of a connecting sleeve having an inner diameter larger than the outer diameter of these pipes. The connection device of the.
일반적으로 토양침출수 또는 오수등을 배수토록 지중에 매설되는 지중매설관은 그 길이가 한정되어 있으므로 단위 관체를 다수 연결하여 사용하기 마련이다. 한편 이러한 지중매설관은 그 크기에 따라 직경이 다양하나 대체로 250-350mm의 직경을 갖는 폴리에틸렌수지의 관체가 사용되나 이러한 관체의 직경은 제조공차가 커서 이들 관체를 연결슬리이브에 연결함에 있어서는 관체와 연결슬리이브사이를 완벽하게 밀폐하여 연결하기 어렵다. 관체와 연결슬리이브사이가 완벽하게 밀폐되지 않는 경우 주위 토양이 누출되는 오폐수에 의하여 오염되는 문제점이 있다.In general, the underground buried pipe buried in the ground to drain the soil leachate or sewage, etc. is limited in length, so it is necessary to connect a number of unit pipes. On the other hand, such underground buried pipes vary in diameter depending on their size, but are generally used in the case of polyethylene resins having a diameter of 250-350 mm. It is difficult to connect with perfect sealing between connecting sleeves. If the space between the tube and the connecting sleeve is not completely sealed, there is a problem that the soil is contaminated by the waste water leaking.
종래 이러한 종류의 연결장치에 있어서는 연결될 두 파형관체가 이들의 대향된 단부가 맞대어지고 이들 단부의 주위에서 외부나선홈에 짧은 길이의 패킹이 삽입되고 탄성시이트가 감긴 다음 플랜지를 갖는 반원통형의 두 고정구가 연결부위에 환착되고 플랜지가 볼트-너트로 체결되도록 하여 두 관체가 연결될 수 있도록 한 것이 알려진 바 있다. 그러나 종래 기술의 이러한 연결장치는 제조코스트가 높고 실제 이를 사용할 때에 관체의 연결부위가 완벽하게 밀폐되도록 연결되지 않는 결점이 있다.Conventionally, in this type of connecting device, two corrugated tubes to be connected have two semi-cylindrical fixtures having their opposite ends opposed to each other, a short-length packing inserted into the outer spiral groove around these ends, the elastic sheet wound, and then having a flange. It is known that the two bodies can be connected by returning to the joint and allowing the flange to be fastened with bolt-nuts. However, such a connection device of the prior art has a disadvantage in that the manufacturing cost is high and the connection part of the tube is not completely sealed when actually used.
본 고안에 있어서는 종래의 이와 같은 점을 감안하여 안출한 것으로, 파형관의 형태인 연결될 두 관체와 연결슬리이브사이가 간단히 연결되는 지중매설관의 연결장치를 제공하는데 그 목적이 있다.The present invention has been made in view of the above-described conventional art, and an object thereof is to provide a connection device of an underground buried pipe that is simply connected between two pipes to be connected in the form of a corrugated pipe and a connection sleeve.
본 고안의 다른 목적은 비교적 내경이 일정하게 제조되는 연결슬리이브에 대하여 그 제조공차 때문에 외경의 크기가 상이한 관체가 이러한 외경차이에도 불구하고 완벽하게 밀폐되도록 연결되는 지중매설관의 연결장치를 제공하는데 있다.Another object of the present invention is to provide a connection device for underground buried pipes, in which a pipe having a different inner diameter is completely sealed in spite of the difference in outer diameter due to its manufacturing tolerance for a connecting sleeve manufactured with a relatively constant inner diameter. have.
본 고안은 주연에 외부나선홈을 갖는 파형관의 형태인 두 관체의 단부를 내경이 이들 관체의 외경보다 크고 내부중간에 내향플랜지를 갖는 짧은 길이의 원통형 연결슬리이브의 양측으로 삽입하여 내향플랜지와 접속되게 연결하는 지중매설관의 연결장치를 제공한다. 본 고안에 따라서, 원통형 연결슬리이브에 삽입될 두 관체의 단부에서 그 외부나선홈에 연결슬리이브와 관체의 재질과 동일 또는 유사한 재질로 구성된 기다란 유연성 튜우브내에 가열시 발포팽창성과 동시에 열융착성을 갖는 조성의 수지분말을 채우고 두 외부접속단자가 노출되게 연장되는 전기저항발열선을 삽입하여 양단을 밀봉한 패킹봉체를 원통형 연결슬리이브에 삽입될 두 관체의 단부에서 그 외부나선홈에 감아 두 관체의 단부를 연결슬리이브에 삽입연결하고 전기저항발열선에 전류를 공급시 이 전기저항발열선의 발열로 패킹봉체가 연결슬리이브와 두 관체사이에서 발포팽창되고 열융착될 수 있도록 한다. 여기에서 패킹봉체를 구성하는 수지분말은 그 조성이 연결될 관체나 연결슬리이브를 구성하고 있는, 예를 들어 폴리에틸렌수지와 동일 또는 유사한 합성수지와 발포수지등으로 구성될 수 있다. 또한 유연성튜우브에 수지분말은 채우는 것 대신에 가열시 발포팽창성과 동시에 열융착성을 갖는 조성의 수지형물을 이용할 수 도 있다.The present invention inserts the ends of two tubes, which are in the form of corrugated tubes with outer spiral grooves at their periphery, on both sides of a short length cylindrical connecting sleeve having an inner diameter larger than the outer diameter of these tubes and having an inward flange in the middle. It provides a connection device for underground buried pipes. According to the present invention, the thermally swellability at the same time as the expansion expandability upon heating in an elongate flexible tubing composed of the same or similar material as the material of the connecting sleeve and the tubular body at the end of the two tubes to be inserted into the cylindrical connecting sleeve. Filling the resin powder of the composition and inserting an electric resistance heating wire extending so that the two external connection terminals are exposed, the packing rod body sealed at both ends is wound around its outer spiral groove at the end of the two pipes to be inserted into the cylindrical connection sleeve. When the end of is inserted into the connecting sleeve and the current is supplied to the heating wire, the heat generating of the heating wire allows the packing rod to expand and expand between the connecting sleeve and the two tubes. Here, the resin powder constituting the packing rod body may be composed of a synthetic resin and a foamed resin that are the same or similar to the polyethylene resin constituting the tube or connection sleeve to be connected to the composition. In addition, instead of filling the resin powder in the flexible tubing, it is also possible to use a resin-like material having a composition which has thermal expansion property at the same time as foam expansion when heated.
본 고안을 첨부도면에 의거하여 보다 상세히 설명하면 다음과 같다.Referring to the present invention in more detail based on the accompanying drawings as follows.
도 1은 본 고안에 사용된 제1실시형태의 패킹봉체를 보인 사시도.1 is a perspective view showing a packing rod body of the first embodiment used in the present invention.
도 2는 도 1에서 보인 패킹봉체의 확대단면도.Figure 2 is an enlarged cross-sectional view of the packing rod body shown in FIG.
도 3은 본 고안의 사용상태단면도.Figure 3 is a cross-sectional view of the use state of the present invention.
도 4는 본 고안에 사용된 제2실시형태의 패킹봉체를 보인 사시도.Figure 4 is a perspective view showing a packing rod body of the second embodiment used in the present invention.
도 5는 도 4에서 보인 패킹봉체의 확대단면도.5 is an enlarged cross-sectional view of the packing rod body shown in FIG.
도면의 주요부분에 대한 부호설명Explanation of Signs of Major Parts of Drawings
10...외부나선홈 12, 14...관체10.External spiral groove 12, 14 ...
18...연결슬리이브 20...유연성 튜우브18.Connection sleeve 20 ... Flexible tube
22...수지분말 28...전기저항발열선22 ... Resin powder 28 ... Electric resistance heating wire
30, 30'...패킹봉체 32... 발포성수지외피재30, 30 '... packing body 32 ... foamed plastic outer shell
도 1∼도 3은 본 고안 의 제1실시형태를 보인 것으로, 주연에 외부나선홈(10)을 갖는 파형관의 형태인 두 관체(12)(14)가 그 단부를 내경이 이들관체(12)(14)의 외경보다 크고 내부중간에 내향플랜지(16)를 갖는 짧은 길이의 원통형 연결슬리이브(18)의 양측으로 삽입하여 내향플랜지(16)와 접속되게 연결된다. 원통형 연결슬리이브(18)에 삽입될 두 관체(12)(14)의 단부에서 그 외부나선홈(10)에 연결슬리이브(18)와 관체(12)(14)의 재질과 동일한 재질로 구성된 기다란 유연성 튜우브(20)내에 가열시 발포팽창성과 동시에 열융착성을 갖는 조성의 발포성수지분말(22)을 채우고 두 외부접속단자(24)(26)가 노출되게 연장되는 전기저항발열선(28)을 삽입하여 양단을 밀봉한 패킹봉체(30)가 원통형 연결슬리이브(18)에 삽입될 두 관체(12)(14)의 단부에서 그 외부나선홈(10)에 수회 감아 두 관체(12)(14)의 단부를 연결슬리이브(18)에 삽입연결된다. 전기저항발열선(28)에 전류를 공급시 이 전기저항발열선(28)의 발열로 패킹봉체(30)가 연결슬리이브(18)와 두 관체(12)(14)사이에서 발포팽창되고 열융착될 수 있다.1 to 3 show a first embodiment of the present invention, in which two tubular bodies 12 and 14, which are in the form of corrugated tubes having outer spiral grooves 10 at their periphery, have their inner diameters 12 at their ends. It is connected to the inward flange 16 by being inserted into both sides of the cylindrical connection sleeve 18 of short length larger than the outer diameter of 14 and having the inward flange 16 in the middle. Consists of the same material as that of the connecting sleeve 18 and the tubular body 12, 14 in the outer spiral groove 10 at the ends of the two tubular bodies 12, 14 to be inserted into the cylindrical connecting sleeve 18. An electric resistance heating wire 28 filling the elongate flexible tubing 20 with foamed resin powder 22 having a composition of thermal expansion and heat swellability upon heating and extending to expose two external connection terminals 24 and 26. The packing rod body 30, which is sealed at both ends by inserting it, is wound several times in the outer spiral groove 10 at the ends of the two tube bodies 12 and 14 to be inserted into the cylindrical connection sleeve 18, and the two tube bodies 12 ( The end of 14 is inserted into the connecting sleeve 18. When the electric resistance heating wire 28 is supplied with current, the packing rod 30 is expanded and thermally fused between the connecting sleeve 18 and the two tubes 12 and 14 by the heat generated by the electric resistance heating wire 28. Can be.
이와 같은 본 고안의 제1실시형태는 두 관체(12)(14)를 원통형 연결슬리이브(18)에 삽입하기 전에 관체(12)(14)의 단부에서 그 주연의 외부나선홈(10)에 외부접속단자(24)(26)가 외측으로 노출되게 수회 감아 두 관체(12)(14)의 단부를 내향플랜지(16)로 구획된 연결슬리이브(18)의 내부 양측으로 단부가 내향플랜지(16)에 접속될 때까지 삽입한다. 이후에 패킹봉체(30)의 외부접속단자(24)(26)에 전원을 연결하여 전기저항발열선(28)으로 전류를 공급하면 전기저항발열선(28)이 발열하여 패킹봉체(30)를 구성하는 수지분말(22)이 가열된다. 이러한 가열로 발포성수지분말(22)은 발포팽창하고 이를 수용하고 있는 유연성 튜우브(20)가 파열되면서 관체(12)(14)의 외부나선홈(10)을 포함하여연결슬리이브(18)와 관체(12)(14)사이의 공간을 완전히 채워 밀폐하고 열융착으로 발포팽창된 패킹봉체(30)가 연결슬리이브(18)와 관체(12)(14)에 융착되어 이들사이의 완벽한 밀폐가 이루어져 연결될 수 있다.This first embodiment of the present invention is provided at the end of the tube body 12 and 14 in the outer spiral groove 10 at its periphery before inserting the tube body 12 and 14 into the cylindrical connection sleeve 18. The outer connection terminals 24 and 26 are wound several times so that the ends of the two tubes 12 and 14 are inwardly connected to both sides of the connection sleeve 18 partitioned by the inward flange 16. Insert until 16) is connected. Thereafter, when the power is connected to the external connection terminals 24 and 26 of the packing bar 30 to supply current to the electric resistance heating wire 28, the electric resistance heating wire 28 generates heat to form the packing bar 30. The resin powder 22 is heated. In this heating, the foamed resin powder 22 expands and expands, and the flexible tube 20 bursting therein includes the outer spiral groove 10 of the tubular body 12 and 14, and the connection sleeve 18 and the connection sleeve 18. The space between the tubes 12 and 14 is completely filled and sealed, and the foamed and expandable packing rod 30 is fused to the connecting sleeve 18 and the tubes 12 and 14 so that a perfect seal therebetween is achieved. Can be connected.
도 4 및 도 5는 본 고안의 제2실시형태를 보인 것으로, 패킹봉체(30')가 전기저항발열선(28)의 외부에 가열시 발포팽창성과 동시에 열융착성을 갖는 조성의 발포성수지외피재(32)를 피복하여 구성된다. 이러한 제2실시형태의 발포성수지외피재(32)는 상기 언급된 제1실시형태의 발포성수지분말(22)을 유연성 튜우브(20)내에 채워 패킹봉체(30)를 구성한것을 대신하여 발포성수지를 외피재형태로 성형하므로서 상기 제1실시형태에서 사용된 유연성튜우브(20)를 사용하지 않아도 될 수 있도록 한 것이다.4 and 5 show a second embodiment of the present invention, wherein the packing rod body 30 'has a foam expansion property and thermal fusion at the same time when heated outside the electrical resistance heating wire 28, and a foamable resin envelope It is comprised by covering 32. The foamable resin envelope 32 of the second embodiment is filled with the foamed resin powder 22 of the first embodiment mentioned above in the flexible tubing 20 to form the packing rod 30 instead of the foamed resin. It is possible to eliminate the need for using the flexible tubing 20 used in the first embodiment by molding the outer shell material.
전기저항발열선(28)은 통상적인 구조로 예를 들어 두 전선(34)(34')의 외피(36)위에 저항선(38)을 감고 저항선(38)의 단부를 전선(34)(34')에 연결하여 구성되는 것이다.The electric resistance heating wire 28 has a conventional structure, for example, the resistance wire 38 is wound on the outer shell 36 of the two wires 34 and 34 ', and the ends of the resistance wire 38 are wired to the wires 34 and 34'. It is configured by connecting to.
이 제2실시형태의 경우도 패킹봉체(30)를 그 외부접속단자(26)(28)가 노출되게 두 관체(12)(14)의 단부에 감아 두 관체(12)(14)의 단부를 연결슬리이브(18)에 삽입연결하고 전기저항발열선(28)에 전류를 공급시 이 전기저항발열선(28)의 발열로 발포성수지외피재(32)가 연결슬리이브(18)와 두 관체(12)(14)사이에서 발포팽창되고 열융착될 수 있다.Also in this second embodiment, the packing rod body 30 is wound around the end portions of the two tubes 12 and 14 so that the external connection terminals 26 and 28 are exposed, and the ends of the two tubes 12 and 14 are wound. When the plug is connected to the connecting sleeve 18 and the current is supplied to the electric resistance heating wire 28, the foamed resin sheath 32 is connected to the connection sleeve 18 and the two bodies 12 by the heating of the electric resistance heating wire 28. Foam expansion and thermal fusion between the (14).
이와 같이 본 고안은 간단한 구조로 연결될 두 관체와 연결슬리이브가 완벽한 밀폐하에 연결될 수 있는 잇점이 있다.As such, the present invention has the advantage that the two bodies to be connected in a simple structure and the connecting sleeve can be connected under perfect sealing.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019980016703 | 1998-09-03 | ||
| KR19980016703 | 1998-09-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20000007507U true KR20000007507U (en) | 2000-04-25 |
Family
ID=54757912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019990004345U Withdrawn KR20000007507U (en) | 1998-09-03 | 1999-03-18 | Device for connecting underground pipes |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20000007507U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100496431B1 (en) * | 2002-07-30 | 2005-06-28 | (주)픽슨 | Structure for connecting a corrugated steel pipe with coating |
| KR101038511B1 (en) * | 2010-12-14 | 2011-06-01 | 대한강관 주식회사 | Connection structure of corrugated steel pipe |
| WO2018194404A1 (en) * | 2017-04-21 | 2018-10-25 | 계진태 | Connection structure for similar or dissimilar material cylindrical pipes that are compatible with each other during excavation work |
| CN111282203A (en) * | 2020-02-25 | 2020-06-16 | 日照市中心医院 | Postpartum pelvic floor muscle contraction rehabilitation training device |
| CN111840913A (en) * | 2020-07-23 | 2020-10-30 | 江苏医药职业学院 | A leg muscle exercise device for elderly care |
-
1999
- 1999-03-18 KR KR2019990004345U patent/KR20000007507U/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100496431B1 (en) * | 2002-07-30 | 2005-06-28 | (주)픽슨 | Structure for connecting a corrugated steel pipe with coating |
| KR101038511B1 (en) * | 2010-12-14 | 2011-06-01 | 대한강관 주식회사 | Connection structure of corrugated steel pipe |
| WO2018194404A1 (en) * | 2017-04-21 | 2018-10-25 | 계진태 | Connection structure for similar or dissimilar material cylindrical pipes that are compatible with each other during excavation work |
| CN111282203A (en) * | 2020-02-25 | 2020-06-16 | 日照市中心医院 | Postpartum pelvic floor muscle contraction rehabilitation training device |
| CN111840913A (en) * | 2020-07-23 | 2020-10-30 | 江苏医药职业学院 | A leg muscle exercise device for elderly care |
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Comment text: Application for Utility Model Registration Patent event code: UA01011R08D Patent event date: 19990318 |
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