KR200435774Y1 - Structure for fixing a union plate of caster - Google Patents

Structure for fixing a union plate of caster Download PDF

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Publication number
KR200435774Y1
KR200435774Y1 KR2020060023462U KR20060023462U KR200435774Y1 KR 200435774 Y1 KR200435774 Y1 KR 200435774Y1 KR 2020060023462 U KR2020060023462 U KR 2020060023462U KR 20060023462 U KR20060023462 U KR 20060023462U KR 200435774 Y1 KR200435774 Y1 KR 200435774Y1
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South Korea
Prior art keywords
hollow shaft
housing
fastening plate
fastening
caster
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KR2020060023462U
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Korean (ko)
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최규일
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(주)오토씨에프티
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B33/00—Castors in general; Anti-clogging castors
    • B60B33/0002—Castors in general; Anti-clogging castors assembling to the object, e.g. furniture
    • B60B33/0005—Castors in general; Anti-clogging castors assembling to the object, e.g. furniture characterised by mounting method
    • B60B33/0007—Castors in general; Anti-clogging castors assembling to the object, e.g. furniture characterised by mounting method by screwing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B33/00—Castors in general; Anti-clogging castors
    • B60B33/006—Castors in general; Anti-clogging castors characterised by details of the swivel mechanism
    • B60B33/0065—Castors in general; Anti-clogging castors characterised by details of the swivel mechanism characterised by details of the swivel axis
    • B60B33/0068—Castors in general; Anti-clogging castors characterised by details of the swivel mechanism characterised by details of the swivel axis the swivel axis being vertical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B33/00—Castors in general; Anti-clogging castors
    • B60B33/04—Castors in general; Anti-clogging castors adjustable, e.g. in height; linearly shifting castors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Handcart (AREA)

Abstract

본 고안은 기계, 장비, 대차 등과 같은 중량물의 하부면에 결합되는 캐스터의 체결판을 간편하게 결합시킬 수 있는 캐스터용 체결판 결합구조에 관한 것이다.The present invention relates to a fastening plate coupling structure for the caster that can be easily coupled to the fastening plate of the caster is coupled to the lower surface of the weight, such as machinery, equipment, trolley.

본 발명에 따른 캐스터용 체결판 결합구조는 중공축(10)의 상단에 방사상으로 확장된 걸림턱(11)이 형성되어, 체결판(20)이 중공축(10)의 하단을 통해 중공축에 끼워져 중공축(10)의 걸림턱(11)에 걸리게 되고, 상기 중공축(10)에 하우징(30)이 끼워져, 상기 하우징(30)이 체결판(20)의 하부에 배치되므로서, 체결판(20)이 하우징(30)에 지지되고, 상기 중공축(10)의 하단에 형성된 나선 체결부(12)에 너트(40)가 체결되어, 상기 너트(40)에 의해 하우징(30)이 지지되는 것을 특징으로 한다.Fastening plate coupling structure for the caster according to the present invention is formed on the upper end of the hollow shaft 10 radially extended engaging jaw 11, the fastening plate 20 through the lower end of the hollow shaft 10 to the hollow shaft It is fitted to the engaging jaw 11 of the hollow shaft 10, the housing 30 is fitted to the hollow shaft 10, the housing 30 is disposed below the fastening plate 20, the fastening plate 20 is supported by the housing 30, the nut 40 is fastened to the spiral fastening portion 12 formed at the lower end of the hollow shaft 10, and the housing 30 is supported by the nut 40. It is characterized by.

Description

캐스터용 체결판 결합구조{STRUCTURE FOR FIXING A UNION PLATE OF CASTER}Fastening plate coupling structure for casters {STRUCTURE FOR FIXING A UNION PLATE OF CASTER}

도 1은 본 고안에 따른 캐스터용 체결판 결합구조를 도시한 분해 단면도1 is an exploded cross-sectional view showing a fastening plate coupling structure for casters according to the present invention

도 2는 도 1의 조립 단면도2 is a cross-sectional view of the assembly of FIG.

도 3은 도 1의 중공축을 도시한 사시도3 is a perspective view of the hollow shaft of FIG.

도 4는 도 1의 체결판을 도시한 평면도4 is a plan view showing the fastening plate of FIG.

*도면의 주요부분에 대한 부호설명** Description of Signs of Main Parts of Drawings *

10 : 중공축 11 : 걸림턱10: hollow shaft 11: locking jaw

20 : 체결판 30 : 하우징20: fastening plate 30: housing

40 : 너트 50 : 제 1 베어링 강구40: nut 50: first bearing steel ball

55 : 제 2 베어링 강구55: second bearing steel ball

본 고안은 기계, 장비, 대차 등과 같은 중량물의 하부면에 결합되는 캐스터의 체결판을 간편하게 결합시킬 수 있는 캐스터용 체결판 결합구조에 관한 것으로 서, 보다 상세하게는 중공축의 상단에 방사상으로 확장된 걸림턱이 형성되어, 체결판이 중공축의 하단을 통해 중공축에 끼워져 중공축의 걸림턱에 걸리게 되고, 상기 중공축에 하우징이 끼워져, 상기 하우징이 체결판의 하부에 배치되므로서, 체결판이 하우징에 지지되고, 상기 중공축의 하단에 형성된 나선 체결부에 너트가 체결되어, 상기 너트에 의해 하우징이 지지되는 캐스터용 체결판 결합구조에 관한 것이다. The present invention relates to a fastening plate coupling structure for the caster that can be easily coupled to the fastening plate of the caster coupled to the lower surface of the heavy weight such as machinery, equipment, bogies, more specifically, radially extended on the top of the hollow shaft A locking jaw is formed so that the fastening plate is fitted to the hollow shaft through the lower end of the hollow shaft to be caught by the locking jaw of the hollow shaft, the housing is fitted to the hollow shaft, and the housing is disposed below the fastening plate, so that the fastening plate is supported by the housing. The present invention relates to a fastening plate coupling structure for casters, in which a nut is fastened to a spiral fastening portion formed at a lower end of the hollow shaft, and the housing is supported by the nut.

대한민국 실용신안등록 제0397296호(2005년 9월 23일 등록)에 "캐스터용 체결판"이 소개되어 있다.Republic of Korea Utility Model Registration No. 0397296 (Registered on September 23, 2005) "Casting plate for casters" is introduced.

상기 캐스터용 체결판은 대차 등의 하부에 설치되는 캐스터용 체결판에 있어서, 상기 대차의 일측에 설치 가능하게 결합공을 구비하고 중앙부에는 통공이 형성된 소정 면적을 갖는 플레이트; 및 상기 플레이트의 아래쪽으로 돌출되게 결합하도록 외주면에는 환형상의 걸림턱을 구비하여 그 걸림턱이 플레이트의 저면에 밀착되게 상기 통공에 일단부를 돌출되게 끼운 다음 상기 돌출된 부위를 외측으로 벌어지게 가압함에 의해 상기 통공의 내경에 끼워지는 형태로 결합한 원통 형상의 돌출부로 이루어져 있다.The caster fastening plate is a caster fastening plate installed in a lower portion of the trolley, etc., the plate having a predetermined area formed with a through hole so as to be installed on one side of the trolley; And an annular locking jaw on the outer circumferential surface so as to protrude to the bottom of the plate so that the hooking jaw is protruded into the through hole so that the locking jaw is in close contact with the bottom of the plate, and then presses the protruding portion outwardly. Consists of a cylindrical projection coupled in the form fitted to the inner diameter of the through hole.

그러나, 상기 캐스터용 체결판은 돌출부의 상단을 리벳팅하여 플레이트를 돌출부에 결합시키도록 되어 있어, 돌출부를 리벳팅하기 위해 프레스 또는 해머 등으로 돌출부를 가격해야 하기 때문에, 돌출부의 강도가 약화될 수 있으며, 중량물을 지지하기 위해 돌출부의 직경이 클 경우 리벳팅 작업이 어려울 뿐만 아니라 추가로 용접이 병행되어야 하기 때문에 제품 원가가 상승되는 단점이 있다.However, the fastening plate for the caster is to rivet the top of the protrusion to couple the plate to the protrusion, so that the strength of the protrusion may be weakened because the protrusion must be hit by a press or a hammer to rivet the protrusion. In addition, if the diameter of the protrusion to support the heavy object is not only difficult to riveting work, but also because the welding must be parallel to the product cost increases.

따라서, 본 고안의 목적은 중공축의 상단에 방사상으로 확장된 걸림턱이 형성되어, 체결판이 중공축의 하단을 통해 중공축에 끼워져 중공축의 걸림턱에 걸리게 되고, 상기 중공축에 하우징이 끼워져, 상기 하우징이 체결판의 하부에 배치되므로서, 체결판이 하우징에 지지되고, 상기 중공축의 하단에 형성된 나선 체결부에 너트가 체결되어, 상기 너트에 의해 하우징이 지지되므로서, 중공축의 강도가 약화되지 않을 뿐만 아니라 리벳팅 등의 추가 작업이 요구되지 않고 조립이 간편하고 원가절감 효과가 있는 캐스터용 체결판 결합구조를 제공하는 것이다.Therefore, an object of the present invention is formed with a radially extended locking jaw at the upper end of the hollow shaft, the fastening plate is fitted to the hollow shaft through the lower end of the hollow shaft to be caught by the locking jaw of the hollow shaft, the housing is fitted to the hollow shaft, the housing Since the fastening plate is disposed in the lower part of the fastening plate, the fastening plate is supported by the housing, the nut is fastened to the spiral fastening portion formed at the lower end of the hollow shaft, and the housing is supported by the nut, so that the strength of the hollow shaft is not weakened. It is also to provide a fastening plate coupling structure for casters that is easy to assemble and cost-effective without the need for additional work such as riveting.

상기와 같은 목적을 달성하기 위한 본 고안의 바람직한 실시예를 도면을 참조하여 상세하게 설명하기로 한다.Preferred embodiments of the present invention for achieving the above object will be described in detail with reference to the drawings.

도 1 및 도 2를 참조하면, 본 고안에 따른 캐스터용 체결판 결합구조는 중공축(10)의 상단에 방사상으로 확장된 걸림턱(11)이 형성되어, 체결판(20)이 중공축(10)의 하단을 통해 중공축에 끼워져 중공축(10)의 걸림턱(11)에 걸리게 되고, 상기 중공축(10)에 하우징(30)이 끼워져, 상기 하우징(30)이 체결판(20)의 하부에 배치되므로서, 체결판(20)이 하우징(30)에 지지되고, 상기 중공축(10)의 하단에 형성된 나선 체결부(12)에 너트(40)가 체결되어, 상기 너트(40)에 의해 하우징(30)이 지지된다.1 and 2, the fastening plate coupling structure for the caster according to the present invention is formed on the upper end of the hollow shaft 10 radially extended engaging jaw 11, the fastening plate 20 is a hollow shaft ( 10 is inserted into the hollow shaft through the lower end of the hollow shaft 10, and the hooking jaw 11 of the hollow shaft 10, the housing 30 is fitted to the hollow shaft 10, the housing 30 is fastening plate 20 Since the fastening plate 20 is supported by the housing 30, the nut 40 is fastened to the spiral fastening part 12 formed at the lower end of the hollow shaft 10, and the nut 40 is disposed at the lower portion of the nut 40. The housing 30 is supported by).

또한, 상기 캐스터용 체결판 결합구조는 체결판(20)의 오목부(21)와 하우징(30)의 오목부(31) 사이에 제 1 베어링 강구(50)가 배치되어, 체결판(20)이 하우징(30)에 대해 상대 회전할 때, 체결판(20)의 회전이 하우징(30)에 의해 간섭되지 않고, 상기 하우징(30)의 오목부(31)와 제 1 베어링 강구(50)의 마찰에 의해 상기 오목부(31)가 마모되는 것을 방지하기 위해 상기 하우징(30)의 오목부(31)에 열처리된 환형상의 오목 강판(53)이 장착되고, 하우징(30)의 원호 코너부(32)와 너트(40)의 상단 원호부(41) 사이에 제 2 베어링 강구(55)가 배치되어, 체결판(20)과 함께 회전되는 너트(40)의 회전이 하우징(30)에 의해 간섭되지 않는다.In addition, the fastening plate coupling structure for the caster has a first bearing steel ball 50 is disposed between the recess 21 of the fastening plate 20 and the recess 31 of the housing 30, the fastening plate 20 When rotating relative to the housing 30, the rotation of the fastening plate 20 is not interfered by the housing 30, and the recess 31 and the first bearing steel ball 50 of the housing 30 are not interfered with. In order to prevent the recess 31 from being worn by friction, an annular recessed steel plate 53 is mounted on the recess 31 of the housing 30, and an arced corner portion of the housing 30 is formed. A second bearing steel ball 55 is disposed between the upper end arc portion 41 of the nut 40 and the rotation of the nut 40, which is rotated together with the fastening plate 20, by the housing 30. It doesn't work.

도 1 및 도 3을 참조하면, 상기 중공축(10)은 중공부(13)가 형성되고, 상단에 방사상으로 확장되는 걸림턱(11)이 형성되고, 상기 걸림턱(11)의 하부에 체결판이 배치되는 다각형 장착부(14)가 형성되고, 상기 다각형 장착부(14)의 하부에 하우징 장착부(15)가 형성되어, 상기 하우징 장착부(15)에 하우징(30)이 배치되고, 상기 하우징 장착부(15)의 하부에 체결 나선부(12)가 형성된다.1 and 3, the hollow shaft 10 has a hollow portion 13, a locking jaw 11 extending radially at an upper end thereof, and fastened to a lower portion of the locking jaw 11. A polygonal mounting portion 14 in which a plate is disposed is formed, and a housing mounting portion 15 is formed below the polygonal mounting portion 14, the housing 30 is disposed in the housing mounting portion 15, and the housing mounting portion 15 is disposed. Fastening spirals 12 are formed at the lower part of the upper part.

상기 다각형 장착부(14)는 육각형 또는 팔각형일 수 있다.The polygonal mounting portion 14 may be hexagonal or octagonal.

도 1 및 도 4를 참조하면, 상기 체결판(20)은 사각판 형상을 가지며, 중앙에 다각형 센터 구멍(22)이 형성되고, 상기 다각형 센터 구멍(22)이 중공축(10)의 다각형 장착부(14)의 형상에 대응되게 육각형 또는 팔각형으로 형성되고, 각각의 코너에 체결구멍(23)이 형성되고, 상기 다각형 센터 구멍(22)과 체결구멍(23) 사이에 오목부(21)가 형성된다.1 and 4, the fastening plate 20 has a rectangular plate shape, and a polygonal center hole 22 is formed at the center thereof, and the polygonal center hole 22 is a polygonal mounting portion of the hollow shaft 10. It is formed in a hexagonal or octagonal shape corresponding to the shape of (14), and fastening holes 23 are formed in each corner, and a recess 21 is formed between the polygonal center hole 22 and the fastening hole 23. do.

이것에 의해, 상기 중공축(10)을 성형할 때부터 걸림턱(11)이 형성되어, 체결판(20)이 중공축(10)의 하단을 통해 끼워진 후, 중공축(10)의 걸림턱(11)에 걸리고, 상기 체결판(20)이 제 1 베어링 강구(50)를 통해 하우징(30)에 지지되므로서, 체결판(20)의 고정을 위해 리베팅 등과 같은 별도의 가공 성형이 요구되지 않으며, 체결판(20)의 다각형 센터 구멍(22)이 중공축(10)의 다각형 장착부(14)에 배치되므로서, 중량물의 하부면에 체결수단(도시하지 않음 ; 나사 또는 볼트)에 의해 고정된 체결판(20)이 중량물에 의해 회전될 때, 상기 중공축(10)이 체결판(20)과 함께 회전되어, 체결판(20)과 중공축(10)의 상대회전을 방지할 수 있다. 이것은 체결판(20)이 중공축(10)에 대해 상대회전할 경우 마찰에 의해 체결판(20)과 중공축(10)의 결합이 헐거워지는 것을 방지할 수 있다. As a result, the locking jaw 11 is formed from the time of forming the hollow shaft 10, and after the fastening plate 20 is fitted through the lower end of the hollow shaft 10, the locking jaw of the hollow shaft 10 is formed. (11), the fastening plate 20 is supported on the housing 30 through the first bearing steel ball 50, so that separate processing molding such as riveting is required for fixing the fastening plate 20 And the polygonal center hole 22 of the fastening plate 20 is disposed in the polygonal mounting portion 14 of the hollow shaft 10, so that the bottom surface of the heavy object is fastened by fastening means (not shown; screws or bolts). When the fixed fastening plate 20 is rotated by a heavy object, the hollow shaft 10 is rotated together with the fastening plate 20, it is possible to prevent the relative rotation of the fastening plate 20 and the hollow shaft 10. have. This can prevent the coupling of the fastening plate 20 and the hollow shaft 10 from loosening by friction when the fastening plate 20 rotates relative to the hollow shaft 10.

상기 하우징(30)에는 높이조절축(61)이 구비된 받침대(60)와, 바퀴(65)가 장착된다.The housing 30 is equipped with a support 60 and a wheel 65 provided with a height adjustment shaft 61.

상기와 같이 구성된 본 고안에 따른 캐스터용 체결판 결합구조가 도 2에 도시된 바와같이 높이조절이 가능한 받침대를 구비한 캐스터(100)에 적용될 경우, 중공축(10)의 중공부(13) 하단에 높이조절축(61)의 상단이 상대회전 가능하게 끼워지므로서, 중공축(10)이 체결판(20)에 의해 회전될 때, 중공축(10)의 회전력이 높이조절축(61)으로 전달되지 않고, 반대로 하우징(30)에 장착된 받침대(60)의 배치높이를 조절하기 위해 높이조절축(61)이 회전될 때, 높이조절축(61)의 회전력이 중공축(10)으로 전달되지 않는다.When the fastening plate coupling structure for the caster according to the present invention configured as described above is applied to the caster 100 having a height adjustable pedestal as shown in Figure 2, the bottom of the hollow portion 13 of the hollow shaft 10 Since the upper end of the height adjustment shaft 61 is fitted in a relatively rotatable manner, when the hollow shaft 10 is rotated by the fastening plate 20, the rotational force of the hollow shaft 10 is moved to the height adjustment shaft 61. Not transmitted, when the height adjustment shaft 61 is rotated to adjust the placement height of the pedestal 60 mounted on the housing 30, the rotational force of the height adjustment shaft 61 is transmitted to the hollow shaft 10 It doesn't work.

위에서 설명한 바와같이, 본 고안에 따른 캐스터용 체결판 결합구조는 체결판이 중공축의 하단을 통해 중공축에 끼워져 중공축의 걸림턱에 걸리게 되고, 상기 중공축에 끼워진 하우징에 체결판이 지지되는 조립 구조를 가짐으로써, 체결판의 조립 공정이 간편하고, 체결판을 조립할 때 중공축의 형상을 변형시키는 리베팅 등과 같이 중공축의 강도를 약화시키는 작업이 요구되지 않아 중공축의 강도를 보장할 수 있는 효과가 있다.As described above, the fastening plate coupling structure for casters according to the present invention has a fastening plate is fitted to the hollow shaft through the lower end of the hollow shaft to be caught by the locking jaw of the hollow shaft, the assembly structure is supported on the housing fitted to the hollow shaft As a result, the assembly process of the fastening plate is simple, and the work of reducing the strength of the hollow shaft is not required, such as riveting, which deforms the shape of the hollow shaft when assembling the fastening plate, thereby ensuring the strength of the hollow shaft.

Claims (4)

중공축(10)의 상단에 방사상으로 확장된 걸림턱(11)이 형성되어, 체결판(20)이 중공축(10)의 하단을 통해 중공축에 끼워져 중공축(10)의 걸림턱(11)에 걸리게 되고, 상기 중공축(10)에 하우징(30)이 끼워져, 상기 하우징(30)이 체결판(20)의 하부에 배치되므로서, 체결판(20)이 하우징(30)에 지지되고, 상기 중공축(10)의 하단에 형성된 나선 체결부(12)에 너트(40)가 체결되어, 상기 너트(40)에 의해 하우징(30)이 지지되는 것을 특징으로 하는 캐스터용 체결판 결합구조.A radially extended locking jaw 11 is formed at the upper end of the hollow shaft 10, so that the fastening plate 20 is fitted to the hollow shaft through the lower end of the hollow shaft 10 so that the locking jaw 11 of the hollow shaft 10 is formed. And the housing 30 is fitted to the hollow shaft 10, and the housing 30 is disposed under the fastening plate 20, so that the fastening plate 20 is supported by the housing 30. The fastening plate coupling structure for the caster, characterized in that the nut 40 is fastened to the spiral fastening portion 12 formed at the lower end of the hollow shaft 10, the housing 30 is supported by the nut 40. . 제 1 항에 있어서,The method of claim 1, 상기 체결판(20)의 오목부(21)와 하우징(30)의 오목부(31) 사이에 배치되는 제 1 베어링 강구(50)와, 상기 하우징(30)의 원호 코너부(32)와 너트(40)의 상단 원호부(41) 사이에 배치되는 제 2 베어링 강구(55)와, 상기 하우징(30)의 오목부(31)와 제 1 베어링 강구(50)의 마찰에 의해 상기 오목부(31)가 마모되는 것을 방지하기 위해 상기 하우징(30)의 오목부(31)에 장착되는 열처리된 환형상의 오목 강판(53)을 더 포함하는 것을 특징으로 하는 캐스터용 체결판 결합구조.A first bearing steel ball 50 disposed between the recess 21 of the fastening plate 20 and the recess 31 of the housing 30, and an arc corner portion 32 and a nut of the housing 30. The concave portion is formed by friction between the second bearing steel ball 55 disposed between the upper end arc portion 41 of the 40, and the concave portion 31 and the first bearing steel ball 50 of the housing 30. 31) further comprising a heat-treated annular concave steel sheet (53) mounted to the recess (31) of the housing (30) to prevent wear. 제 1 항에 있어서,The method of claim 1, 상기 중공축(10)은 중앙에 중공부(13)가 형성되고, 걸림턱(11)의 하부에는 다각형 장착부(14)가 형성되며, 상기 다각형 장착부(14)의 하부에는 하우징 장착부(15)가 형성되는 것을 특징으로 하는 캐스터용 체결판 결합구조.The hollow shaft 10 has a hollow portion 13 is formed in the center, the lower portion of the locking projection 11 is formed with a polygonal mounting portion 14, the lower portion of the polygonal mounting portion 14, the housing mounting portion 15 is Fastening plate coupling structure for casters, characterized in that formed. 제 1 항에 있어서,The method of claim 1, 상기 체결판(20)은 사각판 형상을 가지며, 중앙에 다각형 센터 구멍(22)이 형성되고, 각각의 코너에는 체결구멍(23)이 형성되고, 상기 다각형 센터 구멍(22)과 체결구멍(23) 사이에 오목부(21)가 형성되는 것을 특징으로 하는 캐스터용 체결판 결합구조.The fastening plate 20 has a rectangular plate shape, a polygonal center hole 22 is formed at the center, a fastening hole 23 is formed at each corner, and the polygonal center hole 22 and the fastening hole 23 are formed. Fastening plate coupling structure for the caster, characterized in that the recess 21 is formed between).
KR2020060023462U 2006-08-31 2006-08-31 Structure for fixing a union plate of caster KR200435774Y1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102175360B1 (en) * 2019-04-30 2020-11-06 방정규 Apparatus for mounting caster and serving cart using the same
KR20220118873A (en) * 2021-02-19 2022-08-26 이헌문 Assembly structure of straight caster

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102175360B1 (en) * 2019-04-30 2020-11-06 방정규 Apparatus for mounting caster and serving cart using the same
KR20220118873A (en) * 2021-02-19 2022-08-26 이헌문 Assembly structure of straight caster
KR102494354B1 (en) * 2021-02-19 2023-02-06 이헌문 Assembly structure of straight caster

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