KR20100009746A - Nut cap - Google Patents

Nut cap Download PDF

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Publication number
KR20100009746A
KR20100009746A KR1020080070512A KR20080070512A KR20100009746A KR 20100009746 A KR20100009746 A KR 20100009746A KR 1020080070512 A KR1020080070512 A KR 1020080070512A KR 20080070512 A KR20080070512 A KR 20080070512A KR 20100009746 A KR20100009746 A KR 20100009746A
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KR
South Korea
Prior art keywords
nut
cap
cap body
bolt
coil spring
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KR1020080070512A
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Korean (ko)
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KR100988489B1 (en
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문상열
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(주)파워렉스코퍼레이션
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Priority to KR1020080070512A priority Critical patent/KR100988489B1/en
Publication of KR20100009746A publication Critical patent/KR20100009746A/en
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Publication of KR100988489B1 publication Critical patent/KR100988489B1/en

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    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/14—Cap nuts; Nut caps or bolt caps
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/10—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt
    • F16B39/103—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt with a locking cup washer, ring or sleeve surrounding the nut or bolt head and being partially deformed on the nut or bolt head, or on the object itself
    • F16B39/105—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt with a locking cup washer, ring or sleeve surrounding the nut or bolt head and being partially deformed on the nut or bolt head, or on the object itself locking the bold head or nut into a hole or cavity, e.g. with the cup washer, ring or sleeve deformed into a dimple in the cavity

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bolts, Nuts, And Washers (AREA)
  • Connection Of Plates (AREA)

Abstract

PURPOSE: A nut cap for preventing loosing is provided to prevent a nut from loosing by coupling the nut coupled to a bolt in advance with extra bolt. CONSTITUTION: A nut cap for preventing loosing comprises a cap body(10), a coil spring(20), and a cover(30). A coupling hole(11) is formed in the cap body. The coil spring is inserted inside of the through hole of the cap body so that the rear end of the coil spring is fixed to the cap body. An inner diameter of the coupling hole is bigger than a diameter of a bolt and a thread. A protrusion in which the rear end of the coil spring is hung is formed on the rear end of the coupling hole. The cover covers the rear surface and the outer surface of the cap body.

Description

풀림방지용 너트캡{nut cap}Nut cap for loosening {nut cap}

본 발명은 너트가 결합된 볼트에 추가적으로 결합하여, 의도하지 않은 외력에 의해 너트가 풀리는 것을 방지할 수 있도록 된 풀림방지용 너트캡에 관한 것이다.The present invention further relates to an anti-loosening nut cap which is additionally coupled to a bolt to which a nut is coupled to prevent the nut from loosening by an unintended external force.

일반적으로, 너트는 볼트에 나사결합되어 서로 다른 2개 이상의 부재를 상호 고정하는데 사용된다.Generally, nuts are screwed into bolts and used to secure two or more different members to each other.

한편, 이러한 너트는 폴트에 결합한 후 시간이 지나면, 진동과 같은 외력에 의해 저절로 풀어지게 된다.On the other hand, after the nut is coupled to the fault over time, it is released by itself by external force such as vibration.

따라서, 볼트에 2개의 너트를 결합하여 상호 조임으로써, 너트 사이의 마찰력에 의해 너트가 풀리지 않도록 하는 등의 방법이 이용되고 있으나, 이러한 경우에도 너트가 풀러지는 것을 완전히 방지하지는 못하게 되는 문제점이 있었다.Therefore, by coupling two nuts to the bolt and tightening each other, a method of preventing the nut from loosening due to the friction force between the nuts is used, but even in this case, there is a problem in that the nut is not completely prevented from loosening.

본 발명은 상기의 문제점을 해결하기 위한 것으로서, 이미 너트가 결합된 볼트에 추가적으로 간단히 결합하여, 너트가 풀리는 것을 방지할 수 있도록 된 풀림방지용 너트캡을 제공함에 그 목적이 있다.The present invention is to solve the above problems, it is an object to provide an anti-loosening nut cap that can be additionally simply coupled to the bolt to which the nut is already coupled, to prevent the nut from loosening.

상기한 목적을 달성하기 위한 본 발명은, 전후면을 관통하는 결합공(11)이 형성된 캡본체와; 후단이 캡본체에 고정되도록 캡본체의 관통공 내부에 삽입설치되어 볼트의 나사산에 맞물리는 코일스프링을 포함하며,The present invention for achieving the above object, the cap body formed with a coupling hole 11 penetrating the front and rear surfaces; It includes a coil spring that is inserted into the through hole of the cap body so that the rear end is fixed to the cap body and engaged with the thread of the bolt,

상기 캡본체의 결합공은 내경이 볼트 나사부의 산부분 지름에 비해 크게 형성되고, 결합공의 후단부에는 코일스프링의 후단이 걸리는 걸림턱이 돌출형성되는 것을 특징으로 하는 풀림방지용 너트캡이 제공된다.The coupling hole of the cap body is provided with an inner diameter is larger than the diameter of the screw thread portion, the rear end of the coupling hole is provided with an anti-loosening nut cap characterized in that the engaging jaw is applied to the rear end of the coil spring protruding. .

본 발명에 따른 풀림방지용 너트캡에 따르면, 너트가 이미 결합된 볼트에 추가적으로 결합하면, 코일스프링이 볼트의 나사부와 결합되어 너트의 후면을 가압, 지지하므로, 의도하지 않은 외력에 의해 너트가 풀리는 것을 방지할 수 있는 장점이 있다.According to the anti-loosening nut cap according to the present invention, when the nut is additionally coupled to the bolt to which the nut is already coupled, the coil spring is coupled to the threaded portion of the bolt to pressurize and support the back of the nut. There is an advantage that can be prevented.

이하, 본 발명을 첨부된 예시도면에 의거하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

상기한 목적을 달성하기 위한 본 발명은 도 1내지 도 3에 도시한 바와 같이, 전후면을 관통하는 결합공(11)이 형성된 캡본체(10)와; 후단이 캡본체(10)에 고정되도록 캡본체(10)의 관통공 내부에 삽입설치된 코일스프링(20)과; 상기 캡본체(10)의 후면과 둘레면을 감싸는 합성수지재의 커버(30)로 이루어져, 볼트(1)에 미리 결합된 너트(2)의 후면에 밀착되도록 설치된다.The present invention for achieving the above object is shown in Figures 1 to 3, the cap body 10 is formed with a coupling hole 11 penetrating the front and rear surfaces; A coil spring 20 inserted into the through hole of the cap body 10 so that the rear end is fixed to the cap body 10; Consists of a cover 30 of synthetic resin material surrounding the rear and circumferential surface of the cap body 10, is installed to be in close contact with the rear of the nut (2) pre-coupled to the bolt (1).

상기 캡본체(10)는 강도가 높은 금속을 단조가공하여, 외측 둘레면의 단면이 육각을 이루고, 전후방향의 길이가 일반적인 너트(2)에 비해 1/2정도로 짧게 제작되어, 일반적인 랜치 등을 이용하여 풀거나 조일 수 있도록 구성된 것으로, 상기 코일스프링(20)과 함께 볼트(1)의 나사부(1a)에 결합되어, 볼트(1)에 미리 결합된 너트(2)의 후면에 전면이 밀착되도록 고정된다.The cap body 10 is forged by processing a metal of high strength, the cross section of the outer circumferential surface is hexagonal, the length of the front and rear direction is made about 1/2 shorter than the general nut (2), the general ranch, etc. It is configured to be loosened or tightened by using, coupled to the threaded portion (1a) of the bolt (1) with the coil spring (20), so that the front surface is in close contact with the rear surface of the nut (2) previously coupled to the bolt (1) It is fixed.

상기 결합공(11)은 내경이 볼트(1) 나사부(1a)의 산부분 지름에 비해 크게 형성되어 내부에 상기 코일스프링(20)이 삽입고정되도록 구성되며, 결합공(11)의 후단부, 즉, 캡본체(10)가 볼트(1)에 결합되는 방향의 반대쪽 방향에는 코일스프링(20)의 후단이 걸리는 걸림턱(12)이 돌출형성되어, 결합공(11)의 내부에 삽입된 코일스프링(20)이 걸림턱(12)에 걸려, 캡본체(10)의 후면방향으로 빠져나오지 못하게 고정한다.The coupling hole 11 is formed so that the inner diameter is larger than the diameter of the mountain portion of the screw portion (1a) of the bolt (1) is configured to be fixed to the coil spring 20 inserted therein, the rear end of the coupling hole 11, That is, in the direction opposite to the direction in which the cap body 10 is coupled to the bolt 1, the engaging jaw 12, which catches the rear end of the coil spring 20, protrudes, and the coil inserted into the coupling hole 11 is formed. The spring 20 is caught by the locking jaw 12 to fix the cap 20 in the rear direction.

또한, 캡본체(10)의 후면에는 결합공(11)의 내주면에서부터 캡본체(10)의 외부 둘레면까지 연장되는 고정홈(13)이 형성되어, 상기 고정홈(13)을 이용하여 코일 스프링(20)의 후단이 움직이지 않도록 고정할 수 있도록 구성된다.In addition, the back of the cap body 10 is formed with a fixing groove 13 extending from the inner peripheral surface of the coupling hole 11 to the outer peripheral surface of the cap body 10, the coil spring using the fixing groove 13 The rear end of the 20 is configured to be fixed so as not to move.

상기 코일스프링(20)은 볼트(1) 나사부(1a)의 나사산 방향과 같은 방향으로 감겨지도록 구성되며, 결합공(11)의 내부에 삽입설치되어, 캡본체(10)를 볼트(1)의 나사부(1a)에 결합할 때 나사부(1a)의 골부분에 끼워져 캡본체(10)가 움직이지 않도록 고정하는 기능을 하는 것으로, 후단부에는 상기 캡본체(10)의 고정홈(13)에 삽입고정되는 고정부(21)가 구비된다. 상기 고정부(21)는 코일스프링(20)의 후단을 외측방향으로 절곡하여 구성되는것으로, 상기 고정홈(13)에 삽입고정되므로써 코일스프링(20)의 후단을 움직이지 않도록 고정함과 동시에, 코일스프링(20)의 전단부는 적절한 범위에서 탄성적으로 움직일 수 있도록 지지하는 기능을 한다.The coil spring 20 is configured to be wound in the same direction as the threaded direction of the screw portion 1a of the bolt 1 and is inserted into the coupling hole 11 to install the cap body 10 of the bolt 1. When it is coupled to the screw portion (1a) is inserted into the valley of the screw portion (1a) to function to fix the cap body 10 so as not to move, the rear end is inserted into the fixing groove 13 of the cap body (10) The fixing part 21 is fixed. The fixing portion 21 is configured by bending the rear end of the coil spring 20 in the outward direction, while being fixed to be inserted into the fixing groove 13 to fix the rear end of the coil spring 20 so as not to move, The front end of the coil spring 20 functions to support the elastic spring to move in an appropriate range.

따라서, 상기 코일스프링(20)이 볼트(1)의 나사산에 맞물리도록 캡본체(10)의 관통공을 볼트(1)의 나사부(1a) 외부에 끼운 상태에서, 캡본체(10)를 잠그는 방향으로 회전시키면, 코일스프링(20)과 볼트(1)의 나사부(1a) 사이의 마찰에 의해 코일스프링(20)이 외측로 벌어지면서, 코일스프링(20)이 볼트(1) 나사부(1a)의 골부분을 따라 전진하여 볼트(1)의 나사부(1a) 외주면에 결합된다. 그리고, 캡본체(10)가 외력 등에 의해 풀리는 방향으로 회전될 경우, 코일스프링(20)과 나사산 사이의 마찰에 의해 코일스프링(20)이 중앙쪽으로 조여지면서 나사의 골부분을 파고 들어가 밀착되므로써, 캡본체(10)가 움직이지 않도록 고정한다.Therefore, the cap spring 10 is locked in the state in which the through-hole of the cap body 10 is fitted outside the threaded portion 1a of the bolt 1 so that the coil spring 20 is engaged with the thread of the bolt 1. When rotated to the coil spring 20, the coil spring 20 opens outward by friction between the coil spring 20 and the threaded portion 1a of the bolt 1, and the coil spring 20 of the bolt 1 threaded portion 1a Advance along the valley portion is coupled to the outer peripheral surface of the threaded portion (1a) of the bolt (1). And, when the cap body 10 is rotated in the loosening direction by the external force or the like, the coil spring 20 is tightened toward the center by the friction between the coil spring 20 and the thread, so as to dig into the bone portion of the screw and close, Fix the cap body 10 so as not to move.

상기 커버(30)는 합성수지를 사출성형하여 전면이 개방된 육각 봉형상으로 이루어진 것으로, 상기 캡본체(10)의 후면과 둘레면을 감싸서 외부에서 수분이 유입되는 것을 방지함과 동시에, 캡본체(10)를 가려 너트캡의 외관을 개선하는 기능 을 한다.The cover 30 is made of a hexagonal rod shape, the front of which is opened by injection molding a synthetic resin, and wraps the back and the circumferential surface of the cap body 10 to prevent moisture from entering the outside, the cap body ( 10) It covers the function of improving the appearance of nut cap.

따라서, 도 3에 도시한 바와 같이, 볼트(1)이 이미 너트(2)가 결합된 상태에서, 상기 코일스프링(20)이 볼트(1)의 나사부(1a)에 맞물리도록 하고, 랜치 등을 이용하여 캡본체(10)의 전면이 볼트(1)에 미리 결합된 너트(2)의 후면에 강하게 밀착될 때까지 코일스프링(20)이 감겨진 방향으로 캡본체(10)를 회전시키면, 코일스프링(20)에 의해 캡본체(10)가 너트(2)의 후면에 밀착되도록 고정되므로, 너트(2)가 회전되면서 풀리는 것을 방지하게 된다. Thus, as shown in FIG. 3, the coil spring 20 is engaged with the threaded portion 1a of the bolt 1 in a state where the bolt 1 is already coupled with the nut 2, and a wrench or the like is removed. By rotating the cap body 10 in the direction in which the coil spring 20 is wound until the front of the cap body 10 is in close contact with the rear of the nut (2) pre-coupled to the bolt (1), the coil Since the cap body 10 is fixed to the rear of the nut 2 by the spring 20, the nut 2 is prevented from being released while rotating.

이와같이 구성된 풀림방지용 너트캡은 너트본체(10)의 전후면을 관통하도록 형성된 결합공(11)에 코일스프링(20)을 고정설치하여 구성되므로, 구조가 간단하고, 매우 저렴한 장점이 있다.The anti-loosening nut cap configured as described above is configured by fixing the coil spring 20 to the coupling hole 11 formed to penetrate the front and rear surfaces of the nut body 10, and thus has a simple structure and a very low cost.

또한, 외부에 상기 커버(30)가 구비되어, 내부로 빗물 등과 같은 수분이 유입되는 것을 방지하여, 수분에 의한 부식을 방지할 수 있을 뿐 아니라, 외부를 가려 외관을 개선할 수 있는 장점이 있다.In addition, the cover 30 is provided on the outside to prevent the inflow of moisture, such as rainwater to the inside, to prevent corrosion due to moisture, there is an advantage to improve the appearance by covering the outside. .

이때, 본 발명에 따른 풀림방지용 너트캡은 너트(2)가 미리 결합된 볼트(1)에 추가적으로 결합되므로, 강하게 조일 필요가 없고, 랜치를 이용하여 캡본체(10)를 회전시킬 때, 외부에 결합된 커버(30)가 손상되지 않는다. 따라서, 너트캡을 일차로 볼트(1)에 결합한 후, 별도의 공정을 통해 너트캡을 결합할 필요가 없이, 너트캡이 캡본체(10)에 일체로 결합된 상태에서, 너트캡을 볼트(1)에 결합할 수 있는 장점이 있다.At this time, the anti-loosening nut cap according to the present invention is additionally coupled to the bolt 1 to which the nut 2 is pre-coupled, so that it does not need to be tightened strongly, and when the cap body 10 is rotated using a wrench, The combined cover 30 is not damaged. Therefore, after the nut cap is first coupled to the bolt 1, the nut cap is bolted in a state in which the nut cap is integrally coupled to the cap body 10 without the need to couple the nut cap through a separate process. There is an advantage that can be combined in 1).

그리고, 이러한 너트(2) 고정방법에 따르면, 기존에 볼트(1)에 결합된 너트(2)를 풀지 않고, 추가적으로 풀림방지용 너트캡을 결합하여 너트(2)가 저절로 풀리지 않도록 고정할 수 있으므로, 시공비용과 시간을 절감할 수 있는 장점이 있다.In addition, according to the fixing method of the nut (2), it is possible to fix the nut (2) does not loosen itself by additionally combining the nut cap for preventing loosening, without loosening the nut (2) previously coupled to the bolt (1), There is an advantage that can save construction cost and time.

도 4 및 도 5는 본 발명에 따른 다른 실시예를 도시한 것으로, 상기 커버(30)의 전단부에는 캡본체(10)의 전면보다 전방으로 연장된 원통형의 연장부(31)가 형성된다.4 and 5 show another embodiment according to the present invention, the front end portion of the cover 30 is formed with a cylindrical extension portion 31 extending forward than the front surface of the cap body (10).

상기 연장부(31)는 볼트(1)에 미리 결합된 너트(2)의 외부를 덮도록 된 것으로, 너트캡을 볼트(1)에 결합하면, 상기 연장부(31)가 미리 결합된 너트(2)의 외부를 가려, 외관을 개선할 뿐 아니라, 너트(2)가 비 등을 포함한 수분에 노출되어 부식되는 것을 방지할 수 있는 장점이 있다.The extension part 31 is to cover the outside of the nut (2) pre-coupled to the bolt (1). When the nut cap is coupled to the bolt (1), the extension part 31 is pre-coupled nut ( Covering the outside of 2), not only improves the appearance, there is an advantage that the nut 2 can be prevented from being corroded by exposure to moisture, including rain.

도 1은 본 발명에 따른 너트캡을 도시한 분해사시도,1 is an exploded perspective view showing a nut cap according to the present invention,

도 2는 본 발명에 따른 너트캡을 도시한 측단면도,Figure 2 is a side cross-sectional view showing a nut cap according to the present invention,

도 3은 본 발명에 따른 너트캡의 설치상태를 도시한 참고도,3 is a reference diagram showing an installation state of the nut cap according to the present invention,

도 4는 본 발명에 따른 너트캡의 제2 실시예를 도시한 사시도,4 is a perspective view showing a second embodiment of the nut cap according to the present invention;

도 5는 본 발명에 따른 너트캡의 제2 실시예의 설치상태를 도시한 참고도이다.Figure 5 is a reference diagram showing the installation of the second embodiment of the nut cap according to the present invention.

Claims (4)

전후면을 관통하는 결합공(11)이 형성된 캡본체(10)와; 후단이 캡본체(10)에 고정되도록 캡본체(10)의 관통공 내부에 삽입설치되어 볼트(1)의 나사산에 맞물리는 코일스프링(20)을 포함하며,A cap body 10 having a coupling hole 11 penetrating the front and rear surfaces; It includes a coil spring 20 is inserted into the through hole of the cap body 10 so that the rear end is fixed to the cap body 10 to engage the thread of the bolt (1), 상기 캡본체(10)의 결합공(11)은 내경이 볼트(1) 나사부(1a)의 산부분 지름에 비해 크게 형성되고, 결합공(11)의 후단부에는 코일스프링(20)의 후단이 걸리는 걸림턱(12)이 돌출형성되는 것을 특징으로 하는 풀림방지용 너트캡.The coupling hole 11 of the cap body 10 has an inner diameter larger than the diameter of the peak portion of the threaded portion 1a of the bolt 1, and a rear end of the coil spring 20 is formed at the rear end of the coupling hole 11. Unlocking nut cap, characterized in that the engaging projection 12 is protruding. 제 1항에 있어서, 상기 캡본체(10)는 둘레면이 육각형의 단면을 갖도록 구성된 것을 특징으로 하는 풀림방지용 너트캡.The nut cap for preventing loosening of claim 1, wherein the cap main body (10) has a circumferential surface having a hexagonal cross section. 제 1항에 있어서, 상기 캡본체(10)의 후면과 둘레면을 감싸는 합성수지재의 커버(30)가 더 구비된 것을 특징으로 하는 풀림방지용 너트캡.The anti-loosening nut cap according to claim 1, further comprising a cover (30) of a synthetic resin material surrounding the rear and circumferential surfaces of the cap body (10). 제 3항에 있어서, 상기 커버(30)의 전단부에는 캡본체(10)의 전면보다 전방으로 연장된 원통형의 연장부(31)가 형성된 것을 특징으로 하는 풀림방지용 너트 캡.The nut cap for preventing loosening of claim 3, wherein the front end of the cover (30) has a cylindrical extension (31) extending forward than the front of the cap body (10).
KR1020080070512A 2008-07-21 2008-07-21 nut cap KR100988489B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101373190B1 (en) * 2012-06-14 2014-03-12 (주)금산이엔씨 electric distrbution board equipment having earthquake-proof construction by lock nut
CN106151233A (en) * 2015-03-31 2016-11-23 铃木康之 The locking device of punching press wing nut
CN109026951A (en) * 2018-09-30 2018-12-18 苏州创而丰五金科技有限公司 One kind being fastenedly connected metalwork
KR102073731B1 (en) * 2018-11-19 2020-02-05 (주)바이브록 Hybrid protection cap using lock spring

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101987381B1 (en) * 2018-11-09 2019-06-11 주식회사 코어볼트 Anti-loosing apparatus for nut

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS535656U (en) 1976-06-30 1978-01-19
JPS5840612U (en) * 1981-09-14 1983-03-17 池田　勝美 screw washer set
JPH0550137U (en) * 1991-12-09 1993-07-02 松下電工株式会社 Nut with washer
KR100220218B1 (en) * 1996-04-09 1999-09-01 정부강 Anti-loose nut and bolt

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101373190B1 (en) * 2012-06-14 2014-03-12 (주)금산이엔씨 electric distrbution board equipment having earthquake-proof construction by lock nut
CN106151233A (en) * 2015-03-31 2016-11-23 铃木康之 The locking device of punching press wing nut
CN109026951A (en) * 2018-09-30 2018-12-18 苏州创而丰五金科技有限公司 One kind being fastenedly connected metalwork
KR102073731B1 (en) * 2018-11-19 2020-02-05 (주)바이브록 Hybrid protection cap using lock spring

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