KR100283092B1 - Construction of Crane Crane Boom for Hydraulic Crane_ - Google Patents

Construction of Crane Crane Boom for Hydraulic Crane_ Download PDF

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Publication number
KR100283092B1
KR100283092B1 KR1019980060166A KR19980060166A KR100283092B1 KR 100283092 B1 KR100283092 B1 KR 100283092B1 KR 1019980060166 A KR1019980060166 A KR 1019980060166A KR 19980060166 A KR19980060166 A KR 19980060166A KR 100283092 B1 KR100283092 B1 KR 100283092B1
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KR
South Korea
Prior art keywords
boom
crane
stage
cylinder
sheave
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KR1019980060166A
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Korean (ko)
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KR20000043749A (en
Inventor
이준선
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양재신
대우종합기계 주식회사
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Priority to KR1019980060166A priority Critical patent/KR100283092B1/en
Publication of KR20000043749A publication Critical patent/KR20000043749A/en
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Publication of KR100283092B1 publication Critical patent/KR100283092B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/707—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic guiding devices for telescopic jibs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/03—Cranes with arms or jibs; Multiple cranes
    • B66C2700/0321—Travelling cranes
    • B66C2700/0357—Cranes on road or off-road vehicles, on trailers or towed vehicles; Cranes on wheels or crane-trucks

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Abstract

본 발명은 유압크레인용 크레인 붐의 구조에 관한 것으로, 3단 실린더 단부에 신장용 쉬브가 장착되고, 신장용 로프 한쪽 단부가 5단붐 단부에 고정되며, 다른쪽 단부가 실리더 스포트플레이트웰드에 고정되어 5단붐이 신장되고, 4단붐 단부에 수축용 쉬브가 장착되며, 수축용 로프 한쪽 단부가 5단붐 단부 하부에 고정되며, 다른쪽 단부가 실린더 스포트플레이트웰드에 고정되어 5단붐이 수축됨에 따라, 쉬브가 외부로 돌출되지 않게 되고, 붐의 중량이 감소됨과 더불어 붐의 외관미가 향상되게 된다.The present invention relates to a structure of a crane crane boom for hydraulic crane, wherein an extension sheave is mounted at an end of a three-stage cylinder, one end of an extension rope is fixed to an end of a five-step boom, and the other end is fixed to a cylinder spot plate weld. As the 5-stage boom is extended, the shrinking sheave is mounted at the 4-stage boom end, and one end of the shrinking rope is fixed to the bottom of the 5-stage boom end, and the other end is fixed to the cylinder spot plate weld, so that the 5-stage boom is contracted. The sheave does not protrude to the outside, the weight of the boom is reduced and the appearance of the boom is improved.

Description

유압크레인용 크레인 붐의 구조Construction of Crane Crane Boom for Hydraulic Crane

본 발명은 유압크레인용 크레인 붐에 관한 것으로, 특히 붐 1단에서 5단까지의 형상이 유사하게 이루어져 조립과 분해가 용이해짐과 더불어 붐의 신장과 수축이 자유롭게 실시할 수 있도록 된 유압크레인용 크레인 붐의 구조에 관한 것이다.The present invention relates to a crane crane boom for hydraulic crane, and in particular, the shape of the first to fifth boom is similar to facilitate the assembly and disassembly, as well as the hydraulic crane crane that can be freely extended and contracted boom It is about the structure of the boom.

일반적으로 유압크레인은 소정의 물품을 원하는 높이 및 길이 만큼 이동시키는 장비인데, 이 유압크레인의 붐의 구조는 도 12 및 13에 도시된 것과 같이, 4단붐(40B) 단부에 형성된 두개의 홀(4Ba,4Ba') 사이에 끼워지는 베어링(20,20'), 칼라(30), 핀(40), 플레이트(50) 및 볼트(60)를 매개로 쉬브(10; sheave)에 로프(70)가 걸려지고, 3단붐(30B)단부에 형성된 홀(3Ba) 사이로 상기 로프(70)가 통과하여 고정되어 있다. 즉, 3단붐(30B)에 고정된 로프(70)가 4단에 고정된 쉬브(10)를 감고 이 로프(70)가 5단붐(50B) 끝단에 부착된 브라켓(100)을 되감고 4단붐(40B) 다른쪽 쉬브(10)를 거쳐 볼트(80) 및 너트(90)가 3단붐(30B)에 연결되어 있다.In general, the hydraulic crane is a device for moving a predetermined item by the desired height and length, the structure of the boom of the hydraulic crane is, as shown in Figs. 12 and 13, two holes (4Ba) formed at the end of the four-stage boom (40B) A rope 70 is attached to the sheave 10 through the bearings 20 and 20 ', the collar 30, the pin 40, the plate 50 and the bolt 60 fitted between the 4Ba'. It hangs and the said rope 70 passes and is fixed between the holes 3Ba formed in the 3rd stage boom 30B end part. That is, the rope 70 fixed to the third stage boom 30B winds the sheave 10 fixed to the fourth stage, and the rope 70 rewinds the bracket 100 attached to the end of the five stage boom 50B and the four stage boom. The bolt 80 and the nut 90 are connected to the three-stage boom 30B via the other sheave 10.

따라서, 상기 붐의 작동은 3단붐(30B)에 부착된 붐 실린더(도시되지 않음)가 4단붐(40B)을 밀어올리면, 4단붐(40B)이 신장되면서 4단붐(40B)에 연결된 쉬브(10)도 동시에 신장되면서 로프(70)를 당겨 5단붐(5B)도 동시에 신장하게 된다. 이때, 상기 로프(70)는 외부로 돌출하여 4단붐(40B) 내면과 5단붐(50B) 외면 사이를 이동하면서 붐이 신장하게 된다.Therefore, when the boom cylinder (not shown) attached to the third boom 30B pushes up the fourth boom 40B, the sheave 10 connected to the fourth boom 40B while the fourth boom 40B is extended. ) At the same time while pulling the rope 70, the five-stage boom (5B) is also extended at the same time. At this time, the rope 70 protrudes to the outside while the boom extends while moving between the inner surface of the fourth stage boom 40B and the outer surface of the fifth stage boom 50B.

여기서, 상기 크레인의 붐의 구조는 로프(70)가 외부에 돌출되어 붐을 신장하게되고, 따라서, 하중물을 운반할 때에는 로프(70)와의 간섭이나 엉킴이 발생할 수 있고, 이에 따라 크레인 붐의 안정성 확보에 어려움이 있게 된다. 또한 쉬브(10) 및 로프(70), 고정브라켓(100) 등이 외부로 돌출되어 있어 외관미가 떨어지고, 특히 상기 로프(70)가 4단, 5단붐(40B,50B) 사이를 왕복이동함에 따라, 4, 5단붐(40B,50B) 사이에 로프(70)가 이동할 공간이 필요하게 되어 4단붐(40B)의 형상과 5단붐(50B)의 형상은 일치하지 못함은 물론, 1,2,3,4단붐(10B,20B,30B,40B)의 형상과 완전히 다르게 형성할 수밖에 없고, 필요한 단면계수를 갖추기 위하여 5단붐(50B)의 중간과 하단부에 필연적으로 보강재를 추가하여 부착할 수밖에 없어 붐 전체의 중량이 증가되고, 이에 따라 원거리의 인양 능력이 저하되는 문제점이 발생하였다.Here, the structure of the boom of the crane is that the rope 70 is protruded to the outside to extend the boom, thus, when carrying a load may interfere with the rope 70 or entangled, thereby causing the crane boom Difficulty in securing stability. In addition, the sheave 10 and the rope 70, the fixing bracket 100, etc. protrude to the outside, the appearance is inferior, especially as the rope 70 reciprocates between the four-stage, five-stage boom (40B, 50B) The space for the rope 70 to move between the 4 and 5 stage booms 40B and 50B is required, so that the shape of the 4 stage boom 40B and the 5 stage boom 50B do not coincide, as well as 1,2,3. The shape of the four-stage boom (10B, 20B, 30B, 40B) must be completely different from the shape of the four-tier boom. Increasing the weight of, resulting in a decrease in the lifting capacity of the remote.

이에 본 발명은 상기와 같은 제반 문제점을 해결하기 위해 발명된 것으로, 3단 실린더 단부에 신장용 쉬브를 장착하고, 신장용 로프 한쪽 단부가 5단붐 단부에 고정되고, 다른쪽 단부가 실리더 스포트플레이트웰드에 고정되어 5단붐을 신장시키고, 4단붐 단부에 수축용 쉬브가 장착되며, 수축용 로프 한쪽 단부가 5단붐 단부 하부에 고정되며, 다른쪽 단부가 실린더 스포트플레이트웰드에 고정되어 5단붐을 수축시킴에 따라, 쉬브가 외부로 돌출되지 않게 되고, 붐의 중량을 감소할 수 있음은 물론, 붐의 외관미가 향상되는 유압크레인용 크레인 붐의 구조를 제공함에 그 목적이 있다.Accordingly, the present invention was invented to solve the above problems, the extension sheave is mounted on the end of the three-stage cylinder, one end of the extension rope is fixed to the five-end boom end, the other end of the cylinder spot plate It is fixed to the weld to extend the 5-stage boom, the shrink sheave is mounted on the 4-stage boom end, and one end of the shrinking rope is fixed to the bottom of the 5-stage boom end, and the other end is fixed to the cylinder spot plate weld to shrink the 5-stage boom. As a result, the sheave does not protrude to the outside, it is possible to reduce the weight of the boom, as well as to provide a structure of the crane crane boom for hydraulic crane that improves the appearance of the boom.

도 1a는 크레인트럭에 크레인붐이 장착된 상태를 나타낸 정면도,1a is a front view showing a state in which a crane boom is mounted on a crane truck,

도 1b는 본 발명에 따른, 크레인붐의 상세단면도,1b is a detailed cross-sectional view of the crane boom, in accordance with the present invention;

도 2는 본 발명에 따른, 크레인붐이 2,3,4,5단붐으로 신장했을 때의 정면도,2 is a front view when the crane boom is extended to the 2, 3, 4, 5 boom according to the present invention,

도 3은 본 발명에 따른, 크레인붐이 2,3단붐으로 신장했을 때의 정면도,3 is a front view when the crane boom is extended to the second and third stage booms according to the present invention;

도 4는 본 발명에 따른, 크레인붐 중 2단 및 3단 실린더부의 상세도,4 is a detailed view of the second and third stage cylinder portion of the crane boom, according to the present invention;

도 5는 본 발명에 따른, 실린더 서포트플레이트웰드의 정면도,5 is a front view of a cylinder support plate weld according to the present invention;

도 6은 본 발명에 따른, 실린더 서포트플레이트웰드의 좌측면도,6 is a left side view of the cylinder support plate weld according to the present invention;

도 7은 본 발명에 따른, 실린더 쉬브마운팅웰드의 정면도,7 is a front view of a cylinder sheave mounting weld, in accordance with the present invention;

도 8은 본 발명에 따른, 실린더 쉬브마운팅웰드의 평면도,8 is a plan view of a cylinder sheave mounting weld, according to the present invention;

도 9는 본 발명에 따른, 실린더 쉬브마운팅웰드의 좌측면도,9 is a left side view of the cylinder sheave mounting weld, according to the present invention;

도 10은 본 발명에 따른, 풋플레이트웰드의 정면도,10 is a front view of a footplate weld, in accordance with the present invention;

도 11은 본 발명에 따른, 풋플레이트웰드의 좌측면도,11 is a left side view of the footplate weld, in accordance with the present invention;

도 12는 종래의 구조로서, 크레인용 크레인붐의 사시도,12 is a conventional structure, a perspective view of a crane boom for a crane,

도 13은 종래의 구조로서, 크레인용 크레인붐의 분해사시도이다.FIG. 13 is an exploded perspective view of a crane boom for a conventional structure. FIG.

C --- 크레인붐, T --- 크레인트럭,C --- crane boom, T --- crane truck,

B --- 볼트, 2S --- 2단실린더,B --- bolt, 2S --- two stage cylinder,

3S --- 3단실린더, 1B,∼5B, --- 1단,∼5단붐,3S --- 3-stage cylinder, 1B,-5B, --- 1-stage,-5-stage boom,

1 --- 쉬브, 2 ---실린더 스포트플레이트웰드,1 --- sheave, 2 --- cylinder spotplate weld,

3 --- 실린더 쉬브마운팅웰드, 4 --- 풋플레이트웰드,3 --- cylinder sheave mounting welds, 4 --- foot plate welds,

5 --- 수축용 쉬브, 6 --- 신장용 로프,5 --- shrinking sheave, 6 --- stretching rope,

7 --- 수축용 로프, 8 --- 볼트,너트.7 --- Shrink rope, 8 --- Bolts, nuts.

상기와 같은 목적을 달성하기 위한, 본 발명은 3단 실린더 단부에 신장용 쉬브가 장착되고 신장용 로프 한쪽 단부가 5단붐 단부에 고정되며, 다른쪽 단부가 실린더 스포트플레이트웰드에 고정되어 붐5단을 신장시키고, 4단 붐단부에 수축용 쉬브가 장착되어 수축용 로프 한쪽 단부가 5단붐 단부 하부에 고정되며, 다른쪽 단부가 실린더 스포트플레이트웰드에 고정되어 붐5단을 수축시킬 수 있게 된다.In order to achieve the above object, the present invention is equipped with an extension sheave in the three-stage cylinder end, one end of the extension rope is fixed to the five-step boom end, the other end is fixed to the cylinder spot plate weld 5 boom The contraction sheave is mounted on the fourth stage boom end, and one end of the contraction rope is fixed to the lower end of the fifth stage boom, and the other end is fixed to the cylinder spot plate weld to contract the five booms.

이하 본 발명을 첨부한 예시도면을 참조로 하여 상세하게 설명하기로 한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

도 1a는 크레인트럭에 크레인붐이 장착된 상태를 나타낸 정면도이고, 도 1b는 본 발명에 따른, 크레인붐의 상세단면도이며, 도 2는 본 발명에 따른, 크레인붐이 2,3,4,5단붐으로 신장했을 때의 정면도이고, 도 3은 본 발명에 따른, 크레인붐이 2,3단붐으로 신장했을 때의 정면도이며, 도 4는 본 발명에 따른, 크레인붐 중 2단 및 3단 실린더부의 상세도인데, 본 발명은 3단붐(3B)과 4단붐(4B)에 설치된 3단 실린더(3C) 단부에 실린더 쉬브마운팅웰드(3; sheave mounting weld)가 볼트(B)에 의해서 체결되고, 이 실린더 쉬브마운팅웰드(3)에 쉬브(1; sheave)가 설치됨과 더불어, 슬라이딩이 용이하도록 풋플레이트웰드(4)가 상기 실린더 쉬브마운팅웰드(3)에 체결된다. 또, 상기 풋플레이트웰드(4; foot plate weld) 하부에는 패드가 부착되어 미끄럼이 용이하도록 된다. 상기 쉬브(1)에 로프(6)를 감아 한쪽 단부는 5단붐(5B) 상단부에 볼트 및 너트(8)를 매개로 고정체결되며, 다른 한쪽은 실린더 스포트플레이트웰드(2; support plate weld)에 볼트 및 너트(8)에 의해서 고정된다. 한편, 실린더 스포트플레이트웰드(2)는 2단 실린더(2C) 단부에 고정된다.Figure 1a is a front view showing a crane boom mounted on the crane truck, Figure 1b is a detailed cross-sectional view of the crane boom, according to the present invention, Figure 2, according to the present invention, the crane boom 2,3,4,5 Figure 3 is a front view when extended with a single boom, Figure 3 is a front view when the crane boom is extended to a two- and three-stage boom according to the invention, Figure 4 is a two-stage and three-stage cylinder of the crane boom according to the present invention Although the present invention is a detailed view, the cylinder sheave mounting weld (3; sheave mounting weld) is fastened to the end of the three-stage cylinder (3C) installed in the three-stage boom (3B) and the four-stage boom (4B) by a bolt (B), A sheave 1 is installed in the cylinder sheave mounting weld 3, and the foot plate weld 4 is fastened to the cylinder sheave mounting weld 3 so that sliding is easy. In addition, a pad is attached to the bottom of the foot plate weld 4 to facilitate sliding. The rope 6 is wound around the sheave 1 so that one end is fixedly fastened to the upper end of the 5-stage boom 5B via a bolt and a nut 8, and the other end is connected to a cylinder spot plate weld 2. Secured by bolts and nuts (8). On the other hand, the cylinder spot plate weld 2 is fixed to the end of the 2nd stage cylinder 2C.

따라서, 3단과 4단붐(3B,4B)에 설치된 3단실린더(3C)가 신장하게 되면, 4단붐(4B)이 신장하게 됨과 더불어, 3단실린더(3C) 단부에 부착된 쉬브(1)와 로프(6)에 의해서 5단붐(5B)이 동시에 신장하게 된다.Therefore, when the three-stage cylinder 3C installed in the three-stage and four-stage booms 3B and 4B is extended, the four-stage boom 4B is extended and the sheave 1 attached to the end of the three-stage cylinder 3C and By the rope 6, the five-stage boom 5B is extended at the same time.

한편, 상기의 방법과는 다르게 5단붐(5B) 하단부에는 수축용 로프(7)가 체결되어 있되, 4단붐(4B) 하단부에 설치된 수축용 쉬브(5)를 거쳐 실린더 스포트플레이트웰드(2)에 신장용 로프(6)와 함께 고정되어 있다.On the other hand, unlike the above method, the contraction rope 7 is fastened to the lower end of the five-stage boom 5B, but through the shrinking sheave 5 installed at the lower end of the four-stage boom 4B, to the cylinder spot plate weld 2. It is fixed together with the extension rope 6.

따라서, 3단 실린더(3C)가 수축할 때에는 4단붐(4B)이 수축하게 되고, 4단붐(4B)에 설치된 수축용 쉬브(5)를 통해 수축용 로프(7)를 당겨 5단붐(5B)이 동시에 수축할 수 있도록 된다.Accordingly, when the three-stage cylinder 3C is contracted, the four-stage boom 4B is contracted, and the contracting rope 7 is pulled through the shrinking sheave 5 installed at the four-stage boom 4B to the five-stage boom 5B. At the same time, it is possible to contract.

여기서, 도 5 및 6에 도시된 것과 같이, 실린더 스포트플레이트웰드(2)는 실린더를 수용/지지하는 공간인 안착홈(2a)을 갖추고서, 이 안착홈(2a)의 내측면에 패드(2)가 부착되어져, 실린더가 안전하게 안착되게 된다.5 and 6, the cylinder spot plate weld 2 has a seating groove 2a, which is a space for accommodating / supporting the cylinder, so that the pad 2 is provided on the inner side of the seating groove 2a. ), The cylinder is securely seated.

한편, 도 7, 8 및 9에 도시된 것과 같이, 실린더 쉬브마운팅웰드(3)가 좌측으로 패드지지판(3d)을 갖추고 우측에는 지지판(3b)을 갖추고서, 여기에 두 개의 전면판(3a)과 두 개의 안내판(3c)이 조합되어 이루어진다.On the other hand, as shown in Figs. 7, 8 and 9, the cylinder sheave mounting weld 3 has a pad support plate 3d on the left side and a support plate 3b on the right side, so that there are two front plates 3a. And two guide plates 3c are combined.

또한, 도 9 및 10에 도시된 것과 같이, 풋플레이트웰드(4)가 두 개의 풋플레이트(4a)로 조합되면서 하단부에 패드수용부(4b)를 갖추어진 구조로 형성되어 있다.9 and 10, the foot plate weld 4 is formed into a structure in which the pad receiving portion 4b is provided at the lower end while being combined into two foot plates 4a.

이상 설명한 바와 같이, 본 발명에 의하면 붐 1단에서 5단까지의 형상이 유사하게 이루어져 조립과 분해가 용이해짐과 더불어 붐의 신장과 수축이 자유롭게 실시할 수 있으며, 쉬브가 외부로 돌출되지 않게 되고, 붐의 중량이 감소될 수 있음은 물론, 붐의 외관미가 향상되는 효과가 있다.As described above, according to the present invention, the shapes of the first to fifth booms are similar to facilitate the assembly and disassembly, the extension and contraction of the boom can be freely performed, and the sheave does not protrude to the outside. The weight of the boom can be reduced, as well as the appearance of the boom is improved.

Claims (2)

3단붐(3B)과 4단붐(4B)에 설치된 3단 실린더(3C) 단부에 실린더 쉬브마운팅웰드(3)가 볼트(B)에 의해서 체결되고, 이 실린더 쉬브마운팅웰드(3)에 쉬브(1)가 설치됨과 더불어, 슬라이딩이 용이하도록 풋플레이트웰드(4)가 상기 실린더 쉬브마운팅웰드(3)에 체결되며, 상기 풋플레이트웰드(4) 하부에는 패드가 부착되어 미끄럼이 용이하도록 되되, 상기 쉬브(1)에 로프(6)를 감아 한쪽 단부가 5단붐(5B) 상단부에 볼트 및 너트(8)를 매개로 고정체결되며, 다른쪽 단부는 실린더 스포트플레이트웰드(2)에 볼트 및 너트(8)에 의해서 고정됨과 더불어, 실린더 스포트플레이트웰드(2)가 2단 실린더(2C) 단부에 고정되는 유압크레인용 크레인 붐의 구조.The cylinder sheave mounting weld 3 is fastened to the end of the third stage cylinder 3C provided in the third stage boom 3B and the fourth stage boom 4B by bolts B, and the sheave 1 is attached to the cylinder sheave mounting weld 3. In addition, the foot plate weld 4 is fastened to the cylinder sheave mounting weld 3 to facilitate sliding, and a pad is attached to the bottom of the foot plate weld 4 to facilitate sliding. (1) is wound around the rope (6) and one end is fixed to the upper end of the five-stage boom (5B) via the bolt and nut (8), the other end is the bolt and nut (8) to the cylinder spot plate weld (2) ), And the structure of the crane crane boom for hydraulic crane is fixed to the end of the two-stage cylinder (2C) cylinder spot plate weld (2). 제 1항에 있어서, 상기 5단붐(5B) 하단부에는 수축용 로프(7)가 체결되어 있되, 4단붐(4B) 하단부에 설치된 수축용 쉬브(5)를 거쳐 실린더 스포트플레이트웰드(2)에 신장용 로프(6)와 함께 고정되는 것을 특징으로 하는 유압크레인용 크레인 붐의 구조.The lower end of the five-stage boom (5B) is fastened to the cylinder spot plate weld (2) via a shrinking sheave (5) installed on the lower end of the four-stage boom (4B). Structure of crane crane boom for hydraulic crane, characterized in that fixed together with the rope (6).
KR1019980060166A 1998-12-29 1998-12-29 Construction of Crane Crane Boom for Hydraulic Crane_ KR100283092B1 (en)

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KR1019980060166A KR100283092B1 (en) 1998-12-29 1998-12-29 Construction of Crane Crane Boom for Hydraulic Crane_

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