KR920003349Y1 - Bonding piece automatic welding device of construction scaffold strut - Google Patents
Bonding piece automatic welding device of construction scaffold strut Download PDFInfo
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- KR920003349Y1 KR920003349Y1 KR2019900005460U KR900005460U KR920003349Y1 KR 920003349 Y1 KR920003349 Y1 KR 920003349Y1 KR 2019900005460 U KR2019900005460 U KR 2019900005460U KR 900005460 U KR900005460 U KR 900005460U KR 920003349 Y1 KR920003349 Y1 KR 920003349Y1
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- South Korea
- Prior art keywords
- automatic welding
- fixing
- fixed
- welding device
- construction scaffold
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- 238000003466 welding Methods 0.000 title claims description 34
- 238000010276 construction Methods 0.000 title claims description 9
- 230000008878 coupling Effects 0.000 claims description 21
- 238000010168 coupling process Methods 0.000 claims description 21
- 238000005859 coupling reaction Methods 0.000 claims description 21
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 210000005224 forefinger Anatomy 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass
- B23K37/04—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work
- B23K37/0426—Fixtures for other work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass
- B23K37/04—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work aligning cylindrical work; Clamping devices therefor
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Assembly (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안의 정면도.1 is a front view of the present invention.
제2도는 본 고안의 작동상태 정면도.2 is a front view of the operating state of the present invention.
제3a도, 제3b도, 제3c도, 제3d도는 본 고안의 작동상태 측단면.3a, 3b, 3c, 3d is a side view of the operating state of the present invention.
제4a도, 제4b도는 본 고안 고정구에 결합편이 고정되는 상태를 예시한 종단면도.Figure 4a, Figure 4b is a longitudinal cross-sectional view illustrating a state in which the engaging piece is fixed to the fixture of the present invention.
제5도는 가설발판을 형성한 지주의 사시도.5 is a perspective view of the post which formed the temporary scaffold.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 테이블 2 : 프레임1: table 2: frame
3 : 단턱 4 : 경사면3: stepped 4: slope
5, 5a : 적재대 7, 7a : 고정대5, 5a: loading table 7, 7a: fixing table
8, 8a, 8b, 8c, 8d, 8e,8f : 공압실린더 9, 9a : 브라켓8, 8a, 8b, 8c, 8d, 8e, 8f: Pneumatic cylinder 9, 9a: Bracket
10 : 스토퍼 11 : 가이드레일10: stopper 11: guide rail
14, 14a : 고정편 16, 16a : 유압모터14, 14a: fixed piece 16, 16a: hydraulic motor
17, 17a : 지지축 18, 18a : 고정구17, 17a: support shaft 18, 18a: fixture
19, 19a : 자동용접기 20 : 하우징19, 19a: automatic welding machine 20: housing
21 : 헤드 24 : 삽입홈21: Head 24: Insertion Groove
본 고안은 건축물의 축조시에 임시로 설치되는 가설발판용 지주에 있어서, 수직으로 입설되는 본체 지주에 용착되어서 보강용지주를 고정할 수 있게 하는 결합편의 자동용 접장치에 관한 것이다.The present invention relates to an automatic welding device for a joining piece that can be fixed to a main body post vertically installed in a temporary scaffold strut which is temporarily installed during construction of a building.
가설발판지주는 제5도에서 도시한 바와같이 수직으로 입설된 본체지주(30)를 횡설되는 보강지주(31)로 지지하고 상부에 가설발판(32)을 고정하여 연속반복되게 설치되는 것으로 본체지주(30)와 보강지주(31)의 결합은 본체지주(30)에 용착된 결합편(33)의 걸림턱(34)을 이용하여 결합되는 것이다.The temporary scaffold supports the main body support 30 vertically placed as shown in FIG. 5 with the reinforcement support 31 being horizontally laid and the temporary scaffolding 32 is fixed to the upper part to be installed continuously. Coupling of the 30 and the reinforcing column 31 is to be coupled using the locking step 34 of the coupling piece 33 welded to the body column (30).
종래에 실시되었던 결합편의 용착공정은 수공에 의한 용접작업으로써, 본체지주를 구성하는 환봉에 결합편의 용착부위를 표시하고, 작업자가 집게등의 공구를 사용하여 결합편을 붙잡고 용접작업을 행하는 것으로, 이는 용착되는 결합편의 정확한 수직도를 유지하기 어려워 제품의 불량의 빈번하게 되는등 생산성을 저하 시키는 요인이 되고 있는 것이다.Conventionally, the welding process of the joining piece is a manual welding process, in which the welding part of the joining piece is displayed on the round bar constituting the main body holder, and the worker holds the joining piece using a tool such as a forefinger and performs the welding work. This is difficult to maintain the exact verticality of the welded joint is a factor that reduces the productivity, such as frequent defects of the product.
또한, 용접부는 국부적인 금속가열과 냉각으로 인하여 금속조직에 변화가 생기게 되므로 강도저하의 원인이 되기도 하는데, 특히 수동용접의 경우는 작업자의 숙련정도가 용접의 결과에 미치는 영향에 매우 크게 작용하게 된다.In addition, the welding part may cause a decrease in strength because the metal structure is changed due to local metal heating and cooling, and especially in the case of manual welding, the effect of the skill of the operator on the result of welding is very significant. .
본 고안은 상기한 사항을 감안하여 종래 수공에 의한 작업상의 문제점을 해결한 것으로 사람에 의한 조작부분을 적게하고 작업능률과 생산성을 향상시키므로써 균일한 강도를 가지는 가설발판용 지주를 대향 생산할 수 있는 건축용 가설발판 지주의 결합편 자동용접장치를 제공하기 위한 것이다.The present invention solves the problems of the conventional work by considering the above matters, and can produce a temporary scaffold for uniform scaffolding by reducing the manipulator part and improving work efficiency and productivity. It is to provide an automatic welding device of the combined pieces of construction scaffold struts.
이와같은 목적을 달성하기 위한 본 고안의 주된 특징은 공압 구동장치를 이용하여 작업의 자동화와 인력의 경감을 도모한것으로 테이블에 고착된 적재대의 환봉이 이송되게하는 이송기구와, 상기 이송기구로 부터 공급 되는 환봉을 고정하여 결합편을 용착하기 위한 고정기구와, 상기 고정기구에 의하여 고정된 환봉에 결합편을 용착하기 위하여 결합편이 고정되는 고정구를 포함하는 자동용접기구로 구성되어 유압모터의 하측에 자동용접 장치와 결합편이 고정되는 자동용접기구와 함께 결합편이 고정된 고정구가 고정기구로 고정된 환봉에 근접되게 이동하면서 결합편이 용착되게한 것이다.The main feature of the present invention for achieving the above object is to use a pneumatic drive device for the automation of work and to reduce the manpower of the transfer mechanism for the transfer of the rod of the loading table fixed to the table, and the supply from the transfer mechanism It is composed of a fastening mechanism for welding the coupling piece by fixing the round bar, and an automatic welding mechanism including a fastener to which the coupling piece is fixed to weld the coupling piece to the round bar fixed by the fixing mechanism. With the automatic welding device to which the device and the coupling piece are fixed, the coupling piece is fixed while the coupling piece is fixed to move closer to the round bar fixed by the fixing device.
이하, 본 고안의 구성 및 작용효과를 첨부된 도면에 의하여 보다 상세히 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings the configuration and effect of the present invention in more detail as follows.
테이블(1)의 상부에는 적재된 환봉을 이송하기 위한 이송기구(A)와, 이송기구(A)로 부터 공급받는 환봉을 고정하기 위한 고정기구(B)가 형성되고 테이블(1)후방의 프레임(2)상부에는 자동용접기구(C)가 형성된다.In the upper part of the table (1), a transfer mechanism (A) for transferring the loaded rods and a fixing mechanism (B) for fixing the rods supplied from the transfer mechanism (A) are formed, and the frame behind the table (1) is formed. (2) An automatic welding mechanism C is formed on the upper portion.
이송기구(A)는 테이블(1)의 양측상부 적정위치에 단턱(3)을 형성하는 경사면(4)을 갖는 적재대(5), (5a)를 고정하여 본체지주(30)가 되는 환봉(6)을 재치하도록 하며, 단턱(3)의 하측으로는 환봉(6)을 고정기구(B)로 공급하기 위한 공압실린더(8), (8a)를 고정하여 상기 공압실린더(8), (8a)가 승강작동함에 따라 환봉(6)이 경사면(4)을 타고 고정기구(B)로 공급된다. 이송기구(A)로 부터 환봉(6)을 전달받는 고정기구(B)는 테이블(1) 전방의 상부양쪽에 프라켓(9), (9a)을 고정하면서 일측의 블라켓(9a)에는 환봉(6)의 좌우이동을 방지하고 정확한 용접지점이 맞춰질 수 있도록 공압실린더(8b)를 고착하고, 이에 대향되는 브라켓(9)의 내측으로는 공압실린더(8b)와 마주보는 스토퍼(10)를 형성하며, 상기 브라켓(9), (9a)의 안쪽으로는 가이드 레일(11)이 하향경사를 이루도록 취부된 고정대(7), (7a)를 고정하여 적재대(5)에서 이탈되는 환봉(6)이 안착되게 한다.The transfer mechanism (A) is a round bar that is fixed to the mounting table (5), (5a) having the inclined surface (4) forming the step (3) in the upper right position on both sides of the table (1) to be the main column (30) ( 6), the pneumatic cylinder (8), (8a) for supplying the round bar (6) to the fixing mechanism (B) to the lower side of the step (3) is fixed to the pneumatic cylinder (8), (8a) As the elevating operation (6), the round bar (6) is supplied to the fixing mechanism (B) on the inclined surface (4). Fixing mechanism (B) receiving the round rod (6) from the transfer mechanism (A) is fixed to the racket (9), (9a) on both sides of the upper portion in front of the table (1) while the round bar (9a) The pneumatic cylinder (8b) is fixed to prevent the left and right movement of the 6) and the correct welding point, and the stopper (10) facing the pneumatic cylinder (8b) to the inside of the bracket (9) facing the Inside the brackets (9) and (9a), the guide rods (11) are fixed to the mounting rods (7) and (7a) mounted to form a downward slope, and the round bar (6) detached from the mounting table (5) is Allow them to rest.
고정대(7), (7a)의 약간 뒤쪽으로는 공압실린더(8c), (8d)가 고착되며 공압실린더(8c), (8d)의 피스톤로드에는 일측이 경사지게 형성된 고정편(14), (14a)이 형성되어 고정대(7), (7a)와 이루는 안착홈(13), (13a)이 공압실린더(8b)와 스토퍼(9)가 이루는 중심과 일치되면서 환봉(6)이 들어가게 되므로써 상술한 공압실린더(8b)에 의하여 정확한 용접 위치가 맞춰지게 된다.Pneumatic cylinders 8c and 8d are fixed to the rear of the holder 7 and 7a, and the piston rods 14a and 14a have one side inclined to the piston rods of the pneumatic cylinders 8c and 8d. The pneumatic pressures described above are formed by fitting the rod 7 into the mounting grooves 13 and 13a formed with the holders 7 and 7a and coincident with the center of the pneumatic cylinder 8b and the stopper 9. The correct welding position is adjusted by the cylinder 8b.
고정대(7), (7a)에 안착되는 환봉(6)의 상부에는 자동용접기구(c)가 형성된다.An automatic welding mechanism (c) is formed on the upper portion of the round bar (6) seated on the holder (7), (7a).
자동용접기구(c)는 프레임(2)의 상단에 고정된 고정판넬(15), (15a)에는 통상의 자동용접기(19), (19a)를 승강 작동시키기 위한 공압실린더(8e), (8f)가 고정되어 있으며, 공압실린더(8e), (8f)의 피스톤로드에는 공압모터(16), (16a)가 고착된 고정판넬(15b), (15c)이 결합되며, 공압모터(16), (16a)의 하측으로 형성된 지지축(17), (17a)에는 결합편(33)이 고정되는 고정구(18), (18a)와 공압모터(16), (16a)의 구동으로 회전가능하게 되는 통상의 자동용접기(19), (19a)가 상기 고정구(18), (18a)에 근접하는 위치로 고정된다.The automatic welding mechanism (c) includes pneumatic cylinders (8e) and (8f) for elevating and operating ordinary automatic welding machines (19) and (19a) to the fixed panels (15) and (15a) fixed to the upper end of the frame (2). ) Is fixed to the piston rods of the pneumatic cylinders (8e) and (8f), and the fixed panels (15b) and (15c) to which the pneumatic motors (16) and (16a) are fixed are coupled, and the pneumatic motors (16) The support shafts 17 and 17a formed below the 16a are rotatable by the driving of the fixtures 18 and 18a and the pneumatic motors 16 and 16a to which the engaging pieces 33 are fixed. Normal automatic welding machines 19 and 19a are fixed to positions close to the fixtures 18 and 18a.
고정구(18), (18a)는 제4도에서 보는 바와같이 하우징(20)이 중앙에 삽입되는 헤드(21)로 구성되는 것으로, 하우징(20)에 나사(23)로 헤드(21)를 관착한 다음, 지지축(17), (17a)의 하단과 체결하여 헤드(21)의 하측에 천설되어 결합편(33)이 삽입되는 삽입홈(24)이 테이블(1)상의 고정대(7), (7a)에 고정되는 환봉(6)의 수평 중심선 직상부에 일치한 상태로 설치되는 것이다.The fasteners 18 and 18a consist of a head 21 into which the housing 20 is inserted in the center, as shown in FIG. 4. The head 21 is connected to the housing 20 with screws 23. After the fastening, the support shafts 17 and 17a are fastened to the lower ends of the head 21, and the insertion grooves 24 into which the coupling pieces 33 are inserted are fixed to the table 7 on the table 1, It is provided in the state which corresponded directly to the horizontal center line of the round bar 6 fixed to (7a).
이와같이 구성되는 본 고안은 제1도에서 보는 바와같이 고정대(7), (7a)보다 높은 위치에 경사지게 형성된 적재대(5), (5a)의 단턱(3)에 의해 환봉(6)이 적재된 상태로 대기하게 되고, 이후 고정구(18), (18a)에 결합편(33), (33a)을 각각 삽입한 다음 전기적 신호가 공압제어부(도시하지 않았음)에 주어지면 각각의 공압구동부가 작동을 개시하게 된다.The present invention configured as described above has the round bar 6 loaded by the step 3 of the mounting tables 5 and 5a which are inclined at positions higher than the fixing tables 7 and 7a, as shown in FIG. After that, the coupling pieces 33 and 33a are respectively inserted into the fixtures 18 and 18a, and then each pneumatic driver is operated when an electrical signal is given to the pneumatic control unit (not shown). Will be started.
이때, 결합편(33)의 고정은 제4도에서 보는 바와같으며, 통상적인 결합편(33)의 구조는 내측에 개입된 스프링의 탄발력을 받으면서 걸림턱(34)이 부착되어 있는 것이므로 결합편(33)을 헤드(21)의 삽입홈(24)에 삽입하면 탄발되는 걸림턱(34)에 의해서 결합편(33)이 고정되는 것이다.At this time, the fixing of the coupling piece 33 is as shown in Figure 4, the structure of the conventional coupling piece 33 is because the engaging jaw 34 is attached while receiving the elastic force of the spring interposed inside the coupling When the piece 33 is inserted into the insertion groove 24 of the head 21, the coupling piece 33 is fixed by the locking jaw 34 that is shot.
이같은 상태에서 후속되는 작동과정을 제2도와 제3도에서 도시하고 있으며, 순서에 준하여 상세히 설명하면 다음과 같다.The subsequent operation process in this state is shown in FIG. 2 and FIG. 3, and will be described in detail in the following order.
작업자가 고정구(20), (20a)에 결합편(33)을 삽입하여 고정하고 콘트롤 박스(12)의 스위치를 작동시켜서 전원을 공급하면, 먼저 공압실린더(8), (8a)의 피스톤로드가 상승 및 하강하게 되고, 이에 따라 하나의 환봉이 적재대(5), (5a)의 경사면(4), (4a)을 타고 고정대(7), (7a)로 이송되면 적재대(5), (5a)에 적재된 나머지의 환봉들은 자중에 의해 이동하면서 맨 앞쪽의 환봉이 다시 단턱(3), (3a)에 걸려서 공압실린더(8), (8a)의 상방에 차례로 배열 되어 후속작동을 기다리게 된다.When the operator inserts and secures the engaging piece 33 to the fixtures 20 and 20a and operates the switch of the control box 12 to supply power, the piston rods of the pneumatic cylinders 8 and 8a are first As a result, when one round bar is transported to the mounts 7 and 7a on the inclined surfaces 4 and 4a of the mounts 5 and 5a, the rod 5 and 7a are moved up and down. The remaining rods loaded in 5a) are moved by their own weight, and the first round rod is caught on the step 3, 3a again and is arranged above the pneumatic cylinders 8, 8a to wait for subsequent operation. .
환봉이 고정대(7), (7a)로 이송될때 공압실린더(8c), (8d)의 피스톤로드는 상승되어 있는 상태로 선단에 형성된 고정편(14), (14a)과 고정대(7), (7a)가 이루는 안착홈(13), (13a)에 의해서 이송된 환봉(6)은 고정대(7), (7a)상에 머무르게되고, 작업자가 콘트롤박스(12)의 스위치를 재작동시킴에 따라 공압실린더(8b)가 작동하여 대향측의 부라켓(9)에 고정된 스토퍼(10)까지 환봉을 밀착하여 협지하게 되므로써 고정구(18), (18a)의 위치가 감안된 결합편(33), (33a)의 용접위치가 의도하는 대로 설정할 수 있게 되는 것이며, 이와 동시에 프레임(2)의 상단에 고정된 공압실린더(8e), (8f)가 작동하여 이 피스톤 로드와 연동하는 고정판넬(15c), (15d)에 고정된 공압모터(16), (16a)가 하강하면서 고정구(20), (20a)에 부착된 결합편(33), (33a)이 환봉(6)의 용접부위에 접촉하게 됨과 동시에 콘트롤부에 설정된 제어 순서에 의하여 공압모터(16), (16a)가 구동하여 자동용접기(19), (19a)가 360°회전을 하여 결합편(33), (33a)을 환봉(6)에 용착시킨 다음 상승하게 되는데, 이때 결합편(33), (33a)이 환봉(6)에 용착되어 있으므로 자동용접기(19), (19a)와 고정구(20), (20a)만이 상승하게 된다.When the rod is transported to the holders 7 and 7a, the piston rods of the pneumatic cylinders 8c and 8d are raised, and the fixing pieces 14, 14a and the holder 7, and ( The round bar 6 transported by the seating grooves 13 and 13a formed by 7a stays on the holders 7 and 7a, and as the operator restarts the switch of the control box 12, Pneumatic cylinder (8b) is operated to close the rod to the stopper (10) fixed to the side racket (9) on the opposite side by close contact with the engaging piece (33) in consideration of the position of the fasteners (18), (18a), The welding position of 33a can be set as intended, and at the same time, the pneumatic cylinders 8e and 8f fixed to the upper end of the frame 2 operate to fix the panel 15c in cooperation with the piston rod. The pneumatic motors 16 and 16a fixed to 15d are lowered, and the engaging pieces 33 and 33a attached to the fixtures 20 and 20a come into contact with the welded portion of the round bar 6. At the same time The pneumatic motors 16 and 16a are driven in accordance with the control procedure set in the section, and the automatic welding machines 19 and 19a rotate 360 ° to weld the engaging pieces 33 and 33a to the round bar 6. After the increase, the coupling pieces 33 and 33a are welded to the round bar 6, so that only the automatic welders 19, 19a and the fixtures 20 and 20a are raised.
이와같이 자동용접기구(c)의 상승이 완료되면 환봉(6)의 좌우측을 협지한 공압실린더(8b)와 하축을 받쳐주고 있던 공압실린더(8c), (8d)의 고정편(14), (14a)이 후퇴하여 결합편(33), (33a)이 용착된 환봉(6)은 가이드 레일(11)에 안내되어 되는 것이며 이와같은 결합편(33), (33a)이 용착된 하나의 환봉이 배출되면 공압실린더(8c), (8d)의 고정편(14), (14a)은 재차 상승하여 공압실린더(8), (8a)의 작동으로 시작되는 일련의 작업과정은 계속 수행하게 되는 것이다.When the automatic welding mechanism (c) is raised in this way, the pneumatic cylinder (8b) sandwiching the left and right sides of the round bar (6) and the fixed pieces (14c) and (14d) of the pneumatic cylinders (8c) and (8d) supporting the lower shaft. ), The retracted bar 6 to which the coupling pieces 33 and 33a are welded is guided to the guide rail 11, and one round bar to which the coupling pieces 33 and 33a are welded is discharged. Then, the fixing pieces 14 and 14a of the pneumatic cylinders 8c and 8d are lifted again to continue a series of working processes starting with the operation of the pneumatic cylinders 8 and 8a.
이와같은 본 고안에 의하면 감시자의 스위치 조작만으로 모든 작업공정이 완료되며, 고정구에 의해 정확한 수직도를 갖춘 상태에서 신속하게 결합편이 용착되므로 제품의 불량방지는 물론 생산성을 극대화 시킬 수 있게 되는 매우 유용한 고안인 것이다.According to the present invention, all the work processes are completed only by the operator's switch operation, and the joining pieces are quickly welded in the state of having the correct verticality by the fastener, so that the product can be prevented from defect and maximize the productivity. It is
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900005460U KR920003349Y1 (en) | 1990-04-30 | 1990-04-30 | Bonding piece automatic welding device of construction scaffold strut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900005460U KR920003349Y1 (en) | 1990-04-30 | 1990-04-30 | Bonding piece automatic welding device of construction scaffold strut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR910017962U KR910017962U (en) | 1991-11-28 |
| KR920003349Y1 true KR920003349Y1 (en) | 1992-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019900005460U KR920003349Y1 (en) | 1990-04-30 | 1990-04-30 | Bonding piece automatic welding device of construction scaffold strut |
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| Country | Link |
|---|---|
| KR (1) | KR920003349Y1 (en) |
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1990
- 1990-04-30 KR KR2019900005460U patent/KR920003349Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR910017962U (en) | 1991-11-28 |
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