KR100872881B1 - Manufacturing method of loading block for the blind - Google Patents

Manufacturing method of loading block for the blind Download PDF

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Publication number
KR100872881B1
KR100872881B1 KR1020070138947A KR20070138947A KR100872881B1 KR 100872881 B1 KR100872881 B1 KR 100872881B1 KR 1020070138947 A KR1020070138947 A KR 1020070138947A KR 20070138947 A KR20070138947 A KR 20070138947A KR 100872881 B1 KR100872881 B1 KR 100872881B1
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South Korea
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calcium carbonate
coating layer
slip
liquid resin
block
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KR1020070138947A
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Korean (ko)
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강도묵
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(주)경동기술공사
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00—Details of pavings
    • E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H3/00—Appliances for aiding patients or disabled persons to walk about
    • A61H3/06—Walking aids for blind persons
    • A61H3/066—Installations on the floor, e.g. special surfaces, to guide blind persons
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C15/00—Pavings specially adapted for footpaths, sidewalks or cycle tracks
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C2201/00—Paving elements
    • E01C2201/08—Paving elements having direction indicating means

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Pain & Pain Management (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Rehabilitation Therapy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Road Paving Structures (AREA)
  • Road Signs Or Road Markings (AREA)

Abstract

A manufacturing method of a linear type guide block for the visually impaired having a slip prevention device is provided to prevent slipping by forming a primer layer on the surface of a linear block to have absorption ability and applying a liquefied coating layer, which is constricted precisely by heat, on the top to the thickness of 1mm, and then spraying silica or calcium carbonate of 1~2mm and applying heat to make only particles of silica or calcium carbonate exposed to the outside. A manufacturing method of a linear type guide block for the visually impaired having a slip prevention device, which is placed on a linear block(10) used for guiding the safe walking of the visually impaired in the type of paints, comprises the steps of forming a primer layer(14) on the surface of a linear block to have absorption ability, applying a liquefied coating layer, which is constricted precisely by heat, on the top to the thickness of 1mm, and then spraying silica or calcium carbonate of 1~2mm and making only particles of silica or calcium carbonate exposed to the outside for preventing slipping.

Description

미끄럼방지수단이 구비된 선형타입의 시각장애인 유도블록의 제조방법{Manufacturing method of loading block for the blind}Manufacturing method of inductive block of linear type visually impaired with non-slip means {Manufacturing method of loading block for the blind}

본 발명은 시각장애인 유도블록의 제조방법에 관한 것으로, 특히 시각장애인의 안전보행을 유도하기 위하여 사용되는 선형블록에 도료의 형태로 도포하여 미끄럼을 방지하는 것에 관한 것이다.The present invention relates to a method for manufacturing an induction block for the visually impaired, and more particularly, to preventing slipping by applying a coating in the form of a paint to a linear block used to induce safety walking of the blind.

본 발명은 시각장애인 유도블록의 제조방법에 관한 것으로, 특히 시각장애인의 안전보행을 유도하기 위하여 설치되어진 유도블록, 특히 선형블록의 일정한 폭과 길이로 돌출되어진 돌출상면에 물기나 각종 미끄럼을 유발하는 것 등이 묻어 있을 경우에, 또는 상기한 선형 유도블록이 일정한 경사각을 갖는 사면에 설치되어졌을 경우에 미끄러짐 때문에 안전사고가 발생되는데, 이러한 안전사고를 예방하기 위하여 미끄럼방지수단으로 블록에 미끄럼을 방지할 수 있는 도료를 도포한 것이다.The present invention relates to a manufacturing method of the inductive block for the visually impaired, and in particular, to induce water or various slips on the protruding upper surface protruding at a certain width and length of the inductive block, in particular, the linear block, which is installed to induce safety walking of the visually impaired. If there is something like this, or if the above-mentioned linear guide block is installed on a slope having a certain inclination angle, a safety accident occurs due to slipping. To prevent such a safety accident, a safety accident is prevented from slipping on the block. The paint which can be applied is applied.

현재 각종 건물이나 보도의 통행로에 시각장애인을 위한 점 또는 선형의 형태로 이루어진 유도용 블록이 시공되고 있으나, 이러한 점 또는 선형을 구현하는 방법이 대부분 플라스틱으로 성형되어진 것을 플레이트의 형태로 바닥면에 접착제등을 이용하여 부착토록 하거나, 이러한 플레이트가 부착되어지는 경우 또는 일체 로 성형되어진 콘크리트 블록체를 바닥면에 시공토록 함으로서 구현하게 되는 것이다.Currently, induction blocks made of dots or linear shapes for the visually impaired are installed in the passages of various buildings and sidewalks. However, most of the methods for implementing such points or linear shapes are made of plastic, and are glued to the floor surface in the form of plates. It is to be implemented using such as, or when such a plate is attached or by integrally molded concrete block body to be installed on the floor surface.

따라서 이러한 것의 표면에 형성되는 점형이나 선형 특히 선형블록은 일정한 폭으로 된 상면을 갖게 되고, 상기 상면은 일정길이를 갖게 되는데 이러한 돌출상면에 물기나 미끄럼을 유발하는 물질이 묻어 있을 경우나 이러한 것들이 경사지게 설치되어 졌을 경우에는 순간적인 미끄러짐이 발생되게 된다.Therefore, a point or a linear block, especially a linear block, formed on the surface of the object has a top surface having a constant width, and the top surface has a certain length. When the protruding surface is buried with a substance causing water or slipping, these things are inclined. When installed, instantaneous slippage occurs.

따라서 시각장애인에게는 이러한 미끄러움이 상당히 치명적인 사고를 유발하게 되는 문제점이 있다.Therefore, there is a problem that such slippery causes a fatal accident for the blind.

따라서 본 발명은 이러한 선형블록의 표면에 흡착력을 갖기 위하여 프라이머층을 형성한 후, 그 상면에 열에 의하여 미세하게 수축되어지는 액상의 도포층을 1㎜로 도포토록 한 후 1∼2㎜의 규사나 탄산칼슘을 뿌려주고 열을 가함으로써 규사나 탄산칼슘의 입자만이 외부로 노출토록 하여 미끄럼을 방지토록 한 것이다.Therefore, the present invention is to form a primer layer on the surface of the linear block to have a adsorptive force, and then to the top surface of the liquid coating layer to be finely shrunk by heat to 1mm to 1 mm to 2 mm By spraying calcium carbonate and applying heat, only particles of silica sand or calcium carbonate are exposed to the outside to prevent slipping.

본 발명은 상술한 문제점을 해결하기 위하여, 점형이나 선형의 표면에 흡착력을 높여주는 프라이머를 도포 한 후, 프라이머를 도포 한 상층에 열에 의하여 수축되거나 또는 팽창계수가 낮은 우레탄이나 에폭시계열의 액상수지를 1㎜로 도포하고, 액상수지의 상면에는 직경이 1∼2㎜되는 규사나 탄산칼슘의 미분상태로 된 입자와 열을 가함으로서 수축경화되어지는 액상의 우레탄이나 에폭시와 혼합토록 한 후 선형블록의 돌출상면에 도포하여 열을 가함으로써 에폭시나 우레탄이 수축되어지면서 경화되어 규사나 탄산칼슘의 일부분만이 외부로 노출되어 미끄럼이 방지되면서도 규사나 탄산칼슘이 돌출상면에서 용이하게 분리되어지지 않게 되는 시각장애인 유도블록의 제조방법을 제공한다.The present invention, in order to solve the above problems, after applying a primer that improves the adsorptive force on the surface of the point or the linear, and then the urethane or epoxy-based liquid resin shrinks by heat or has a low coefficient of expansion It is applied to 1mm, and the upper surface of the liquid resin is mixed with liquid urethane or epoxy which is shrink-hardened by adding particles and particles made of finely divided silica sand or calcium carbonate with a diameter of 1 ~ 2mm and heat. Epoxy or urethane shrinks and hardens by applying heat to the protruding top surface, and only part of the silica sand or calcium carbonate is exposed to the outside to prevent slippage, while the silica sand or calcium carbonate is not easily separated from the protruding top surface. It provides a method of manufacturing a disabled guide block.

상술한 바와 같은, 본 발명의 제조방법으로 제조된 유도블록은 논슬립입자체를 액상의 수지계와 혼합한 후 열에 의하여 액상의 수지가 수축되어지면서 입자체의 일부만이 노출되어짐으로 논슬립의 구현은 물론 이러한 논슬립이 외력에 의하여도 쉽게 이탈되어지지 않토록 하는 효과가 있다.As described above, the induction block manufactured by the manufacturing method of the present invention, after mixing the non-slip particle body with the liquid resin system, the liquid resin is shrunk by heat, so that only a part of the particle body is exposed. There is an effect that the non-slip is not easily separated even by the external force.

이하 첨부된 도면을 참조하면서 본 발명에 따른 바람직한 실시 예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 일실시예의 외관상태를 나타낸 것이고, 도2는 본 발명의 시공상태의 블럭도이다.1 is a view showing the appearance of an embodiment of the present invention, Figure 2 is a block diagram of the construction of the present invention.

도시된 바와 같이 본 발명은 기존의 선형으로 이루어진 시각장애인용 보도블록본체(10)의 돌출상면(14)에 흡착력을 우수하게 하기 위하여 프라이머층(12)을 형성하는 공정(S10)과, 상기 프라이머층(12)에 규사와 탄산칼슘 미분으로 이루어진 논슬립입자체(13)를 열에 의한 수축과 팽창계수가 낮은 우레탄이나 에폭시계열의 액상수지와 혼합하여 도포층(11)을 형성하는 공정(S20)과, 상기 프라이머층(12)의 상측에 논슬립입자체(13)와 우레탄이나 에폭시계열의 액상수지가 혼합된 도포층(11)을 가열하는 공정(S30)으로 제조되어, 액상의 수지만이 수축 경화되어져 논슬립 입자체(13)가 노출되어짐을 특징으로 하게 된다.As shown in the present invention, the process for forming a primer layer 12 to improve the adsorptive force on the protruding upper surface 14 of the sidewalk block body 10 for the blind, which is made of a conventional linear (S10) and the primer A step (S20) of forming a coating layer 11 by mixing a non-slip particle body 13 composed of silica sand and calcium carbonate fine powder with a urethane or epoxy resin having a low coefficient of thermal shrinkage and expansion in the layer 12; And a step (S30) of heating the non-slip particle body 13 and the coating layer 11 in which a urethane or an epoxy-based liquid resin is mixed on the upper side of the primer layer 12, so that only the liquid resin is shrink-hardened. It is characterized in that the non-slip particle 13 is exposed.

이때 도포층(11)은 1㎜ 이내로 도포토록 하고, 규사와 탄산칼슘 미분으로 되는 논슬립입자체(13)는 그 직경이 1∼2㎜정도로 함으로서 도포층(11)에 도포되어진 규사와 탄산칼슘 미분 등의 논슬립입자체(13)가 우레탄이나 에폭시 계열의 액상의 수지가 열에 의하여 수축되어질 경우에 일부분이 함침되어진 상태에서 규사와 탄산칼슘 미분으로 되는 논슬립입자체(13)만이 노출되어지면서 논슬립을 구현하게 되는 것이다.At this time, the coating layer 11 is doped to within 1 mm, and the non-slip particle 13 made of silica sand and calcium carbonate fine powder has a diameter of about 1 to 2 mm so that the silica sand and calcium carbonate powder applied to the coating layer 11 are finely divided. When the non-slip particle 13 such as urethane or epoxy-based liquid resin is contracted by heat, only the non-slip particle 13 made of silica sand and calcium carbonate fine powder is exposed while partially impregnating to realize non-slip. Will be done.

또한 상기와 같이 논슬립입자체(13)가 이러한 함침에 의하여 도포층(11)에서 쉽게 이탈되어지지 않게 되는 것이다.In addition, as described above, the non-slip particle body 13 is not easily separated from the coating layer 11 by this impregnation.

또한 이러한 도포층(11)을 1㎜이상으로 할 경우에는 도포층(11)의 박리가 발생되어짐으로 1㎜이내에서 시공되어지는 것이 가장 우수한 효과를 얻을 수 있게 됨을 표1에서와 같은 실험결과로 알 수 있었다.In addition, when the coating layer 11 is 1 mm or more, since the peeling of the coating layer 11 is generated, it is possible to obtain the most excellent effect that the construction is performed within 1 mm. Could know.

또한 이때 도포층(11)을 형성할 경우에 도포층이 논슬립입자체(13)의 전체면을 도포토록 한 상태에서 액상의 수지가 수축되어질 경우에 논슬립입자체(13)에는 액상의 수지가 도포되어진 상태에서 프라이머층(12)의 상층으로 도포되어지는 도포층(11)이 견고하게 경화되어짐으로 논슬립입자체(13)의 표면은 물론 논슬립입자체(13)의 자체가 도포층(11)에 일부가 묻혀 있게 됨으로 외력에 의하여 용이한 이탈이 발생되지 않게 되는 것이다.In this case, when the coating layer 11 is formed, the liquid resin is applied to the non-slip particle body 13 when the liquid resin is shrunk while the coating layer covers the entire surface of the non-slip particle body 13. In this state, the coating layer 11 applied to the upper layer of the primer layer 12 is hardened so that not only the surface of the non-slip particle body 13 but also the non-slip particle body 13 itself is applied to the coating layer 11. Some of the buried will not be easily released by the external force.

그리고 표2 및 표3에서와 같이, 도포층(11)에 함유되어지는 우레탄이나 에폭시계열의 액상의 수지와 규사나 탄산칼슘 미분의 함량은 우레탄이나 에폭시계열의 액상의 수지가 20%(부피기준)이고 규사나 탄산칼슘 미분등의 논슬립입자체(13)가 80%(부피기준)일 경우에도 논슬립의 효과가 우수함을 알 수 있었고, 그러나 이러한 함량의 비율이 본 발명의 목적을 제한하는 것이 아니고, 도포층(11)을 형성할 경우에 도포의 용이성과 혼합의 용이성을 감안하면 각각 50%(부피기준)로 할 경우에 가장 도포와 시공성이 우수함을 알 수 있었다.As shown in Tables 2 and 3, the content of urethane or epoxy-based liquid resin and silica sand or calcium carbonate fine powder contained in the coating layer 11 is 20% of the urethane or epoxy-based liquid resin (volume basis). ) And even when the non-slip particle 13, such as silica sand or calcium carbonate fine powder, is 80% (volume basis), it can be seen that the effect of the non-slip is excellent, but the proportion of such content does not limit the object of the present invention. In the case of forming the coating layer 11, considering the ease of application and the ease of mixing, it was found that the coating and the workability were most excellent when the coating layer was set to 50% (volume basis).

도포층 두께에 따른 박리 테스트Peel test according to coating layer thickness 도포층Coating layer 0.7mm0.7mm 0.8mm0.8mm 0.9mm0.9mm 1mm1 mm 1.1mm1.1mm 1.5mm1.5mm 2.0mm2.0mm 경과시간Elapsed time 24시간24 hours 24시간24 hours 24시간24 hours 24시간24 hours 24시간24 hours 24시간24 hours 24시간24 hours 박리여부Peel off 박리안됨No peeling off 박리안됨No peeling off 박리안됨No peeling off 박리안됨No peeling off 박리안됨No peeling off 강한자극시박리됨Peeled on strong stimulation 약한자극에박리됨Isolation of weak stimulation

입자체 굵기에 따른 이탈 테스트Departure test according to grain size 입자체Particle sieve 1-2mm1-2mm 4-5mm4-5mm 7-8mm7-8mm 9-10mm9-10mm 경과시간Elapsed time 24시간24 hours 24시간24 hours 24시간24 hours 24시간24 hours 박리여부Peel off 이탈안됨No deviation 긁으면약간이탈Scratch off slightly 긁으면이탈Scratch off 이탈됨Exited

액상대비 논슬립입자체 구성비에 따른 박리 및 논슬립효과 테스트(부피기준)Peel and Non-Slip Effect Test by Volume Ratio 구성비Composition ratio 액상(%)Liquid phase (%) 5050 4040 3030 2020 1010 논슬립입자(%)Non-slip Particles (%) 5050 6060 7070 8080 9090 경과시간Elapsed time 24시간24 hours 24시간24 hours 24시간24 hours 24시간24 hours 24시간24 hours 24시간24 hours 박리여부Peel off 이상없음clear 이상없음clear 이상없음clear 이상없음clear 박리됨Peeled 미끄럼저항성(BPN)Slip Resistance (BPN) 5050 5656 5757 6464 7575

참고 KS F 4561 점자블록 미끄럼저항성 기준 20 BPN이상Reference KS F 4561 Braille Block Slip Resistance Above 20 BPN

도 1은 종래의 선형블록의 사시도.1 is a perspective view of a conventional linear block.

도 2 및 도 3은 본 발명의 선형블록에 논슬립입자가 형성된 상태도.2 and 3 is a state diagram in which non-slip particles are formed in the linear block of the present invention.

도 4는 선형블록의 돌출상면에만 논슬립입자가 형성된 상태의 단면도.Figure 4 is a cross-sectional view of the non-slip particles formed only on the protruding upper surface of the linear block.

도 5는 논슬립입자가 도포층에 고정되어진 상태의 확대단면도.5 is an enlarged cross-sectional view of the non-slip particles fixed to the coating layer.

도 6은 선형블록의 전체면에 논슬립입자가 형성된 상태의 단면도.6 is a cross-sectional view of the non-slip particles formed on the entire surface of the linear block.

도 7은 본 발명의 제조공정을 도시한 공정도.7 is a process chart showing the manufacturing process of the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

10: 블록본체 11: 도포층10: block body 11: coating layer

12: 프라이머층 13: 논슬립입자12: primer layer 13: non-slip particles

14: 돌출상면14: protrusion top surface

Claims (4)

삭제delete 기존의 선형으로 이루어진 시각장애인용 보도블록본체(10)의 돌출상면(14)에 흡착력을 우수하게 하기 위하여 프라이머층(12)을 형성하는 공정(S10)과, 상기 프라이머층(12)에 규사와 탄산칼슘 미분으로 이루어진 논슬립입자체(13)를 열에 의한 수축과 팽창계수가 낮은 우레탄이나 에폭시계열의 액상수지와 혼합하여 도포층(11)을 형성하는 공정(S20)과, 상기 프라이머층(12)의 상측에 논슬립입자체(13)와 우레탄이나 에폭시계열의 액상수지가 혼합된 도포층(11)을 가열하는 공정(S30)으로 제조되어, 액상의 수지만이 수축 경화되어져 논슬립 입자체(13)가 노출되어짐을 특징으로 하는 미끄럼방지수단이 구비된 선형타입의 시각장애인 유도블록의 제조방법에 있어서, Forming a primer layer (12) in order to improve the adsorptive force on the protruding upper surface 14 of the conventional blind block body 10 is made of a linear (S10), and the silica layer in the primer layer 12 Mixing the non-slip particle 13 made of calcium carbonate powder with a urethane or epoxy-based liquid resin having a low shrinkage and expansion coefficient by heat to form a coating layer 11 (S20), and the primer layer 12 The non-slip particle body 13 and the coating layer 11 in which the urethane or epoxy-type liquid resin was mixed are heated at the upper side of the step (S30), and only the liquid resin is shrink-hardened and the non-slip particle body 13 is In the manufacturing method of the visually impaired inductive block of the linear type with a non-slip means, characterized in that the exposed; 상기 도포층(11)은 1㎜ 이내로 도포토록 하고, 규사와 탄산칼슘 미분으로 되는 논슬립입자체(13)는 그 직경이 1∼2㎜정도로 함을 특징으로 하는 미끄럼방지수단이 구비된 선형타입의 시각장애인 유도블록의 제조방법.The coating layer 11 is doped with less than 1mm, and the non-slip particle 13 made of silica sand and calcium carbonate powder has a diameter of about 1 to 2 mm. Method of manufacturing the induction block for the blind. 제2항에 있어서, 상기 도포층(11)에 함유되어지는 우레탄이나 에폭시계열의 액상의 수지와 규사나 탄산칼슘 미분의 함량은 우레탄이나 에폭시계열의 액상의 수지가 20%(부피기준)이고 규사나 탄산칼슘 미분등의 논슬립입자체(13)가 80%(부피기준)임을 특징으로 하는 미끄럼방지수단이 구비된 선형타입의 시각장애인 유도블록의 제조방법.The content of the urethane or epoxy-based liquid resin and the silica sand or calcium carbonate fine powder contained in the coating layer 11 is 20% (volume basis) of the urethane or epoxy-based liquid resin. (2) Non-slip particle (13), such as calcium carbonate fine powder (80) (volume basis), characterized in that the linear blind visually impaired induction block with a non-slip means. 제2항에 있어서, 상기 도포층(11)에 함유되어지는 우레탄이나 에폭시계열의 액상의 수지와 규사나 탄산칼슘 미분의 함량은 우레탄이나 에폭시계열의 액상의 수지가 각각 50%(부피기준)임을 특징으로 하는 미끄럼방지수단이 구비된 선형타입의 시각장애인 유도블록의 제조방법.The content of the urethane or epoxy-based liquid resin and silica sand or calcium carbonate fine powder contained in the coating layer 11 is 50% (volume basis), respectively. Method for producing a visually impaired induction block of the linear type with a non-slip means characterized in that.
KR1020070138947A 2007-12-27 2007-12-27 Manufacturing method of loading block for the blind KR100872881B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102221325B1 (en) * 2020-12-04 2021-03-02 문진호 Non-slip braille block sheet for guiding the disabled

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960011004A (en) * 1994-09-15 1996-04-20 이성갑 Non-slip road surface attachment plate and its manufacturing method and non-slip road surface construction method using this road surface attachment plate

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960011004A (en) * 1994-09-15 1996-04-20 이성갑 Non-slip road surface attachment plate and its manufacturing method and non-slip road surface construction method using this road surface attachment plate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102221325B1 (en) * 2020-12-04 2021-03-02 문진호 Non-slip braille block sheet for guiding the disabled
KR20220079362A (en) * 2020-12-04 2022-06-13 문진호 Non-slip braille block sheet for guiding the disabled
KR102482879B1 (en) 2020-12-04 2022-12-29 문진호 Non-slip braille block sheet for guiding the disabled

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