KR0169878B1 - Release devices of rotary motor lock devices of superstructure rotary devices available for travelling straight circuits of construction equipment - Google Patents
Release devices of rotary motor lock devices of superstructure rotary devices available for travelling straight circuits of construction equipment Download PDFInfo
- Publication number
- KR0169878B1 KR0169878B1 KR1019960002865A KR19960002865A KR0169878B1 KR 0169878 B1 KR0169878 B1 KR 0169878B1 KR 1019960002865 A KR1019960002865 A KR 1019960002865A KR 19960002865 A KR19960002865 A KR 19960002865A KR 0169878 B1 KR0169878 B1 KR 0169878B1
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- Prior art keywords
- spool
- swing
- pump
- valve
- devices
- Prior art date
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
- E02F9/12—Slewing or traversing gears
- E02F9/121—Turntables, i.e. structure rotatable about 360°
- E02F9/123—Drives or control devices specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
- E02F9/12—Slewing or traversing gears
- E02F9/121—Turntables, i.e. structure rotatable about 360°
- E02F9/125—Locking devices
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
Abstract
본 발명은 건설장비의 상부 선회장치의 선회모터 잠금장치의 해제장치에 대한 것으로, 종래의 장치에서는 셔틀밸브(7)를 사용하는 구조로 되어 있으므로 그 구조가 다소 복잡한 구조로 되며, 제작비용도 비싸지게 되는 문제점이 있었으나, 본 발명에서는 건설장비의 상부 선회 장치중의 선회모터 잠금장치의 잠금상태 해제방법을 종래의 선회조작 레버부의 셔틀밸브에 의해 작동하던 것을 메인콘트롤밸브의 주행직진회로를 이용하여 작동하도록 하여, 셔틀밸브를 삭제하고서도 종전과 동일한 기능을 갖도록 함에 의해서 제작비용을 저렴토록 하고 구조를 단순화하였다.The present invention relates to the release device of the swing motor locking device of the upper swing device of construction equipment, the conventional device has a structure using a shuttle valve (7), so that the structure is a somewhat complicated structure, manufacturing cost is also expensive In the present invention, the method of releasing the locked state of the swing motor locking device in the upper swing device of the construction equipment was operated by the conventional shuttle valve lever shuttle valve using the traveling straight circuit of the main control valve. By operating, eliminating the shuttle valve and having the same function as before, the manufacturing cost is reduced and the structure is simplified.
Description
제1도는 종래 건설장비의 상부 선회장치 및 주행직진회로장치의 유압회로도.1 is a hydraulic circuit diagram of an upper turning device and a traveling straight circuit device of a conventional construction equipment.
제2도는 본 발명에 의한 상부 선회장치 및 주행직진회로장치의 유압회로도이다.2 is a hydraulic circuit diagram of the upper turning device and the traveling straight circuit device according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 엔진 2 : 오일탱크1: engine 2: oil tank
3 : 제1펌프 4 : 제2펌프3: first pump 4: second pump
5 : 제3펌프 6 : 선회조작레버5: third pump 6: turning lever
8 : 메인콘트롤밸브 9 : 선회모터8: main control valve 9: swing motor
10 : 선회잠금장치 11 : 선회밸브10: swing lock device 11: swing valve
12 : 주행직진밸브 13 : 주행직진회로12: driving straight valve 13: driving straight circuit
14 : 상부 선회장치 15 : 붐스풀14: upper turning device 15: boomspool
16 : 버킷스풀 17 : 좌주행스풀16: bucket spool 17: left running spool
18 : 선회스풀 19 : 암스풀18: turning spool 19: arm spool
20 : 우주행스풀 21 : 잠금바아20: Space Hang Spool 21: Lock Bar
22 : 스프링22: spring
본 발명은 건설장비의 상부 선회장치의 선회모터 잠금장치의 해제장치에 대한 것으로, 종래에는 선회조작레버부의 셔틀밸브에 의하여 선회모터 잠금해제를 하던 것을 셔틀밸브를 삭제하고 메인콘트롤밸브의 주행직진회로에 의해 직접적으로 선회모터의 잠금장치가 해제되도록 하는 선회모터 잠금장치의 해제장치에 관한 것이다.The present invention relates to a device for releasing a swing motor lock of an upper swing device of construction equipment. In the related art, the swing motor unlocked by the shuttle valve of the swing operation lever part deletes the shuttle valve and runs a straight line circuit of the main control valve. It relates to a release device of the swing motor lock device to be released by the locking device of the swing motor directly.
일반적으로 크롤러식 굴삭기와 같이 유압실린더에 의한 작업장치와 유압모터에 의한 주행장치를 모두 구비하는 건설중장비에 있어서, 주행만 할 경우에는 좌주행모터와 우주행모터에 비교적 균일하게 압유가 공급되므로 별도의 장치가 없이도 직진주행이 가능하지만 굴삭 또는 선회등의 작업을 주행중에 하게될 경우에는 좌주행모터와 우주행모터에 공급되는 유량에 차이가 발생하게 되므로 별도의 주행직진회로가 없이는 직진주행이 불가능하게 된다.In general, in the construction equipment equipped with both a working device by a hydraulic cylinder and a driving device by a hydraulic motor, such as a crawler type excavator, the hydraulic oil is supplied to the left driving space motor and the space running motor relatively uniformly when traveling only. It is possible to drive straight without the device, but if driving or excavation is in progress, there is a difference in the flow rate supplied to the left traveling space motor and space traveling motor, so it is impossible to go straight without a separate driving straight circuit. Done.
제1도는 종래 건설장비의 상부 선회장치 및 주행직진회로장치의 유압회로도로서 상기 도면에서 보면, 제1펌프(3) 및 제2펌프(4)와, 상기 제1펌프(3)로 부터 순차적으로 관로 연결된 붐스풀(15), 버킷스풀(16), 좌주행스풀(17)과 제2펌프(4)로 부터 순차적으로 관로 연결된 선회스풀(18), 암스풀(19), 우주행스풀(20)로 이루어진 메인콘트롤밸브(8)와, 좌주행스풀(17) 유입측 포트와 우주행스풀(20) 유압측 포트 사이에서 관로 연결되며 작업기 작동시에 그 제어단에 파일롯트 압이 가해지도록 제3펌프(5)와 연결된 주행직진밸브(12)로 구성된다.1 is a hydraulic circuit diagram of an upper turning device and a traveling straight circuit device of a conventional construction equipment. As shown in the drawing, the first pump 3 and the second pump 4 and the first pump 3 are sequentially formed. From the boom spool (15), bucket spool (16), the left running spool (17) and the second pump (4) connected to the spool spool 18, arm spool (19), space hang spool (20) ) Is connected to the main control valve (8) consisting of a main control valve (8), the left running spool (17) inlet port and the space hang spool (20) hydraulic side port and the pilot pressure is applied to the control stage when the work machine is operated. It consists of a traveling straight valve 12 connected to the three pump (5).
제3펌프(5)로 부터의 압유라인은 분기되어 상기한 주행직진밸브(12)의 제어단과 암스풀(19)에 각각 연결되는데, 암스풀(19)에 연결된 압유라인은 계속적으로 선회스풀(18), 붐스풀(15), 버킷스풀(16)을 경유하여 탱크로 드레인되도록 연결되어서 주행직진회로(13')를 구성한다.The oil pressure line from the third pump 5 is branched and connected to the control stage of the traveling straight valve 12 and the arm spool 19, respectively, and the oil pressure line connected to the arm spool 19 continuously rotates the spool ( 18), the boom spool 15 and the bucket spool 16 are connected so as to be drained to the tank to form a traveling straight circuit 13 '.
또한, 붐스풀(15)등의 메인콘트롤밸브(8)의 각종 스풀은 유압실린더나 유압모터와 같은 각종 작업기에 관로 연결되는데, 제1도는 각종 작업기중에서 상부 선회장치(14)만 연결된 상태를 도시한 일부 생략도로서 상기 도면에서 보면, 선회스풀(18)은 상부 선회장치(14)에 관로 연결되며, 상기 선회스풀(18)의 양측 제어단은 선회조작레버(6)를 사이에 두고 제3펌프(5)의 파일롯트 압라인이 연결된다.In addition, various spools of the main control valve 8 such as the boom spool 15 are connected to various work machines such as a hydraulic cylinder or a hydraulic motor, and FIG. 1 shows a state in which only the upper swing device 14 is connected among various work machines. As shown in the drawing as a partial omission view, the swing spool 18 is connected to the upper swing device 14 by a pipe, and both control stages of the swing spool 18 are connected to each other with the swing operation lever 6 interposed therebetween. The pilot pressure line of the pump 5 is connected.
이와 같이 구성되는 종래의 건설장비에서는 작업없이 주행만 할 경우, 좌주행모터를 구동하기 위한 좌주행스풀(17)로는 제1펌프(3)로 부터의 압유만이 공급되고 우주행모터를 구동하기 위한 우주행스풀(20)로는 제2펌프(4)로 부터의 압유가 공급되며 주행직진밸브(12)는 동작하지 않는다.In the conventional construction equipment configured as described above, when only driving without work, only the pressure oil from the first pump 3 is supplied to the left driving spool 17 for driving the left driving motor, and the space motor is driven. The pressure vessel from the second pump 4 is supplied to the space hang spool 20 for the traveling straight valve 12 does not operate.
그러나, 주행중 선회작업을 하기 위해 선회조작레버(6)를 작동하면 선회스풀(18)이 작동되고, 상기 선회스풀(18)을 통해 제2펌프(4)로 부터의 압유의 일부가 선회모터(9)에도 공급되므로, 좌주행스풀(17)과 우주행스풀(20) 사이의 압유공급의 불균일이 발생될 수 있는데, 실제적으로는 선회조작레버(6) 작용과 동시에 주행직진밸브(12)가 작동되므로 상기 주행직진밸브(12)를 통해 좌주행스풀(17)와 우주행스풀(20)에 각각 동일한 압유가 공급되게 되는 것이다.However, when the swing operation lever 6 is operated to make the swing operation while driving, the swing spool 18 is operated, and a part of the hydraulic oil from the second pump 4 is turned through the swing spool 18. 9), the non-uniformity of the hydraulic oil supply between the left running spool 17 and the space hanging spool 20 may occur. In practice, the traveling straight valve 12 is simultaneously operated with the turning operation lever 6. As such, the same pressure oil is supplied to the left running spool 17 and the space hanging spool 20 through the traveling straight valve 12, respectively.
또한, 이와 같은 종래의 건설장비에서는 선회모터(9)에 대한 안전장치로서, 선회스풀(18)로 향하는 주행직진밸브(12)의 양측 토출단 사이에 설치되는 셔틀밸브(7)와, 상기 셔틀밸브(7)의 토출단이 그 제어단에 연결되며 제3펌프가 그 유입단에 연결되는 선회밸브(11)와, 상기 선회밸브(11)의 토출단에 연결되며 선회모터(9) 측부에 설치되는 선회잠금장치(10)를 구비하는데, 선회작업을 하지 않는 상태에서는 선회잠금장치(10)의 스프링(22)의 탄발력에 의해 잠금바아(21)가 돌출되므로 선회모터(9)가 회재자재할 수 없게 되는 고정된 상태가 되지만, 선회작업을 할 경우에는 선회조작레버(6)의 조작과 함께 셔틀밸브(7)를 통해 선회밸브(11)의 제어단에 공급된 압유에 의해 선회밸브(11)가 작동되고 이에 따라 제3펌프(5)로 부터 공급된 압유가 선회밸브(11)를 통해 선회잠금장치(10)에 공급되므로, 잠금바아(21)는 스프링(22)의 탄발력을 이기고 후퇴하게 됨에 의해 선회모터(9)는 잠금상태가 해제되는 것이다.In addition, in such a conventional construction equipment as a safety device for the swing motor (9), the shuttle valve (7) is provided between the discharge end of both sides of the traveling straight valve 12 toward the swing spool (18), and the shuttle The discharge end of the valve 7 is connected to the control end thereof, and the third pump is connected to the inlet end thereof, and the discharge end of the swing valve 11 is connected to the side of the swing motor 9. The swing lock device 10 is provided, but the swing bar 9 is rotated because the lock bar 21 protrudes due to the elastic force of the spring 22 of the swing lock device 10 when the swing work is not performed. When the swinging operation is performed, the swinging valve is operated by the hydraulic oil supplied to the control end of the swinging valve 11 through the shuttle valve 7 together with the operation of the swinging lever 6. (11) is operated so that the hydraulic oil supplied from the third pump (5) is turned through the turning valve (11) Is supplied to the gold apparatus 10, the lock bar 21 is the swing motor (9) by being retracted to overcome the spring force of the spring 22 will be locked off.
그런데, 이와 같은 종래의 장치에서는 셔틀밸브(7)를 사용하는 구조로 되어 있으므로 그 구조가 다소 복잡한 구조로 되며, 제작비용도 비싸지게 되는 문제점이 있었다.By the way, such a conventional apparatus has a structure that uses the shuttle valve (7), the structure is a somewhat complicated structure, there was a problem that the manufacturing cost is also expensive.
본 발명은 이와 같은 문제점을 해결하기 위한 것으로, 건설장비의 상부 선회장치중의 선회모터 잠금장치의 잠금상태 해제방법을 종래의 선회조작레버부의 셔틀밸브에 의해 작동하던 것을 메인콘트롤밸브의 주행직진회로를 이용하여 작동하도록 하여, 셔틀밸브를 삭제하고서도 종전과 동일한 기능을 갖도록 함에 의해서 제작비용을 저렴토록 하고 구조를 단순화하는데 그 목적이 있는 것이다.The present invention is to solve such a problem, the operation of the lock state of the lock motor lock device in the upper swing device of the construction equipment was operated by the conventional shuttle valve lever shuttle valve running straight circuit of the main control valve In order to operate by using, to eliminate the shuttle valve to have the same function as before, the purpose is to reduce the manufacturing cost and simplify the structure.
첨부도면에 의해 본 발명의 구성을 상세히 설명하면 다음과 같다.The configuration of the present invention by the accompanying drawings in detail as follows.
제2도는 본 발명에 의한 상부 선회장치 및 주행직진회로장치의 유압회로도로서 상기 도면에서 보면, 제1펌프(3) 및 제2펌프(4)와, 상기 제1펌프(3)로 부터 순차적으로 관로 연결된 붐스풀(15), 버킷스풀(16), 좌주행스풀(17)과 제2펌프(4)로 부터 순차적으로 관로 연결된 선회스풀(18), 암스풀(19), 우주행스풀(20)로 이루어진 메인콘트롤밸브(8)와, 좌주행스풀(17) 유입측 포트와 우주행스풀(20) 유압측 포트 사이에서 관로 연결되며 작업기 작동시에 그 제어단에 파일롯트 압이 가해지도록 제3펌프(5)와 연결된 주행직진밸브(12)로 구성되는 건설장비에 있어서; 제3펌프(5)로 부터의 압유라인은 붐스풀(15), 버킷스풀(16), 암스풀(19), 선회스풀(18)을 순차적으로 경유토록 연결되고 나서 분기되어 주행직진밸브(12)의 제어단과 탱크에 각각 연결되어서 주행직진회로(13)를 구성하며, 상기 선회스풀(18)를 통과한 압유라인에서 분기된 압유라인은 제3펌프(5)가 그 압유단에 연결된 선회밸브(11)의 제어단에 연결되며, 상기 선회밸브(11)의 토출단은 선회모터(9)의 측부에 설치된 선회잠금장치(10)에 연결된다.2 is a hydraulic circuit diagram of the upper turning device and the traveling straight circuit device according to the present invention. As shown in the drawing, the first pump 3 and the second pump 4 and the first pump 3 are sequentially formed. From the boom spool (15), bucket spool (16), the left running spool (17) and the second pump (4) connected to the spool spool 18, arm spool (19), space hang spool (20) ) Is connected to the main control valve (8) consisting of a main control valve (8), the left running spool (17) inlet port and the space hang spool (20) hydraulic side port and the pilot pressure is applied to the control stage when the work machine is operated. In the construction equipment consisting of a traveling straight valve 12 connected to the three pump (5); The oil pressure line from the third pump 5 is connected to the boom spool 15, the bucket spool 16, the arm spool 19, and the turning spool 18 sequentially and then branched to the traveling straight valve 12. Connected to the control stage and the tank, respectively, and constitutes a traveling straight circuit 13, and the oil pressure line branched from the oil pressure line passing through the swing spool 18 has a turning valve connected to the oil pressure end by a third pump 5; It is connected to the control end of (11), the discharge end of the swing valve 11 is connected to the swing lock device 10 installed on the side of the swing motor (9).
이상과 같이 구성되는 본 발명장치는 다음과 같이 작동된다.The apparatus of the present invention configured as described above operates as follows.
본 발명에서는 메인콘트롤밸브(8)의 주행직진회로(13)가 종전에는 암스풀(19), 선회스풀(18), 붐스풀(15), 버킷스풀(16) 순으로 연결되어 있던 것을 선회스풀(18) 이외의 스풀작동시 선회잠금장치(10)의 풀림을 막기 위해 주행직진회로(13)를 암스풀(19), 버킷스풀(16), 붐스풀(15), 선회스풀(18) 순으로 통하게 한 뒤 선회스풀(18)의 이전에서 파일롯 압라인을 분기하여 이 회로의 파일럿 작동유를 통하여 잠금밸브(11)를 작동하도록 이루어져 있으므로, 선회와 같은 작업을 하지 않고 주행만 하는 경우에는 종래와 마찬가지로 제1펌프(3) 및 제2펌프(4)에서 공급된 압유가 좌주행스풀(17)과 우주행스풀(20)를 통해서만 주행모터(미도시함)에 공급되어 주행하게 되지만, 주행과 함께 선회작업을 하기 위해 선회조작레버(6)를 조작할 경우 선회스풀(18)이 작동됨과 동시에, 주행직진회로(13)가 선회스풀(18)에서 탱크로 드레인되도록 연결되는 압유라인이 폐쇄되므로, 선회스풀(18)의 이전에 분기연결된 압유로를 통해 압유가 선회밸브(11)의 제어단에 공급되어 선회밸브(11)를 작동시키면 제3펌프(5)로 부터 공급된 압유가 선회잠금장치(10)에 공급되므로, 잠금바아(21)는 스프링(22)의 탄발력을 이기고 후퇴하게 되어 선회모터(9)의 잠금장치는 해제되고, 선회스풀(18)을 통해 제2펌프(4)로 부터 공급된 압유에 의해 선회동작하게 되는 것이다.In the present invention, the turning straight circuit 13 of the main control valve 8 is connected to the arm spool 19, the turning spool 18, the boom spool 15, and the bucket spool 16 in order. In order to prevent the swing locking device 10 from loosening when the spool is operated, the driving straight circuit 13 may be arm spool 19, bucket spool 16, boom spool 15, and swing spool 18 in this order. Since the pilot pressure line is branched from the turning spool 18 before the turning spool 18, the lock valve 11 is operated through the pilot oil of this circuit. Similarly, the pressurized oil supplied from the first pump 3 and the second pump 4 is supplied to the driving motor (not shown) only through the left driving spool 17 and the space hanging spool 20 to travel. When the swing operation lever 6 is operated to turn the swing together, the swing spool 18 is operated and at the same time Since the oil pressure line connecting the straight circuit 13 to drain from the swing spool 18 to the tank is closed, the oil pressure is supplied to the control stage of the swing valve 11 through the previously connected pressure passage of the swing spool 18. When the swing valve 11 is operated, the hydraulic oil supplied from the third pump 5 is supplied to the swing lock device 10, so that the lock bar 21 retreats to overcome the elasticity of the spring 22 and retracts. The locking device of the motor 9 is released and is rotated by the hydraulic oil supplied from the second pump 4 through the swing spool 18.
또한 선회동작을 중단하게 될 경우에는 선회스풀(18)이 복귀하게 되고 주행직진회로(13)도 폐쇄된 상태에서 해제되므로 선회밸브(11)는 복귀하게 됨에 의해 선회잠금장치(10) 내에 충진되어 있던 압유가 상기 선회밸브(11)를 통해 탱크로 드레인하게 되고, 선회모터(9)는 다시 잠금상태가 되는 것이다.In addition, when the turning operation is stopped, the turning spool 18 is returned and the driving straight circuit 13 is also released in the closed state, so the turning valve 11 is filled in the turning locking device 10 by returning. The pressurized oil is drained into the tank through the swing valve 11, and the swing motor 9 is locked again.
이와 같이 본 발명장치는 건설장비의 상부 선회장치(14)중의 선회모터(9) 잠금장치의 잠금상태 해제방법을 종래의 선회조작 레버부의 셔틀밸브에 의해 작동하던 것을 메인콘트롤밸브(8)의 주행직진회로(13)를 이용하여 작동하도록 하여, 셔틀밸브를 삭제하고서도 종전과 동일한 기능을 갖도록 함에 의해서 제작비용을 저렴토록하고 구조를 단순화하게 되는 우수한 발명이다.As described above, the apparatus of the present invention operates the method of releasing the locked state of the locking device of the swinging motor 9 in the upper swinging device 14 of the construction equipment by the shuttle valve of the conventional swing control lever part. By using the straight circuit 13 to operate, by eliminating the shuttle valve to have the same function as before, it is an excellent invention to reduce the manufacturing cost and simplify the structure.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960002865A KR0169878B1 (en) | 1996-02-07 | 1996-02-07 | Release devices of rotary motor lock devices of superstructure rotary devices available for travelling straight circuits of construction equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960002865A KR0169878B1 (en) | 1996-02-07 | 1996-02-07 | Release devices of rotary motor lock devices of superstructure rotary devices available for travelling straight circuits of construction equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR970062216A KR970062216A (en) | 1997-09-12 |
| KR0169878B1 true KR0169878B1 (en) | 1999-02-18 |
Family
ID=19450838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019960002865A KR0169878B1 (en) | 1996-02-07 | 1996-02-07 | Release devices of rotary motor lock devices of superstructure rotary devices available for travelling straight circuits of construction equipment |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR0169878B1 (en) |
-
1996
- 1996-02-07 KR KR1019960002865A patent/KR0169878B1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR970062216A (en) | 1997-09-12 |
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