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KR100332361B1 - auto wheelchair - Google Patents

auto wheelchair Download PDF

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Publication number
KR100332361B1
KR100332361B1 KR1019990039471A KR19990039471A KR100332361B1 KR 100332361 B1 KR100332361 B1 KR 100332361B1 KR 1019990039471 A KR1019990039471 A KR 1019990039471A KR 19990039471 A KR19990039471 A KR 19990039471A KR 100332361 B1 KR100332361 B1 KR 100332361B1
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KR
South Korea
Prior art keywords
main body
steering wheel
seat
horizontal
wheel
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Expired - Fee Related
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KR1019990039471A
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Korean (ko)
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KR20010027642A (en
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최철호
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최철호
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Priority to KR1019990039471A priority Critical patent/KR100332361B1/en
Priority to KR2019990019786U priority patent/KR200173709Y1/en
Publication of KR20010027642A publication Critical patent/KR20010027642A/en
Application granted granted Critical
Publication of KR100332361B1 publication Critical patent/KR100332361B1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/06—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, kerbs or steps
    • A61G5/061—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, kerbs or steps for climbing stairs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/04—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs motor-driven
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/06—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, kerbs or steps
    • A61G5/066—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, kerbs or steps with endless belts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/1056—Arrangements for adjusting the seat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric

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  • Public Health (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Handcart (AREA)
  • Carriages For Children, Sleds, And Other Hand-Operated Vehicles (AREA)

Abstract

본 발명은 계단을 손쉽게 오르내릴 수 있도록 된 새로운 구조의 동력휠체어에 관한 것이다.The present invention relates to a power wheelchair of a new structure that can be easily up and down stairs.

본 발명에 따르면, 본체(4)와, 이 본체의 하부양측에 장착되어 구동장치에 의해 구동되는 무한궤도(6)와, 이 본체(4)에 설치된 시트(2)와, 상기 본체(4)의 전방에 설치된 조향륜(24)과, 이 조향륜(24)에 연결된 조향핸들(26)과, 지면과 소정간격을 이루도록 이 조향륜(24)의 전방상측에 설치된 보조휠(30)을 포함하여 구성되는 것을 특징으로 하는 동력휠체어가 제공된다.According to the present invention, the main body 4, the endless track 6 mounted on both lower sides of the main body and driven by a drive device, the seat 2 provided on the main body 4, and the main body 4 A steering wheel 24 provided at the front of the steering wheel, a steering wheel 26 connected to the steering wheel 24, and an auxiliary wheel 30 provided at the front upper side of the steering wheel 24 so as to form a predetermined distance from the ground. Power wheelchair is provided, characterized in that configured.

본 발명의 다른 특징에 따르면, 상기 시트(2)는 본체(4)에 설치된 수평유지장치(12)에 설치되며, 상기 수평유지장치(12)는 상기 본체(4)의 상면에 설치된 지지대(14)와, 이 지지대(14)에 전후방향으로 회동가능하게 설치되며 그 상면에 상기 시트(2)가 장착되는 수평케이블(16)과, 이 수평케이블(16)에 연결되어 상기 본체(4)의 전후방 기울기에 따라 수평케이블(16)을 전후회동시키는 회동수단(18)을 포함하여 구성되는 것을 특징으로 하는 동력휠체어가 제공된다.According to another feature of the invention, the seat 2 is installed in the horizontal holding device 12 installed in the main body 4, the horizontal holding device 12 is a support 14 installed on the upper surface of the main body 4 And a horizontal cable 16 mounted on the support 14 so as to be rotatable in the front-rear direction and on which the seat 2 is mounted, and connected to the horizontal cable 16, A power wheelchair is provided comprising a rotating means 18 for rotating the horizontal cable 16 back and forth according to the forward and backward tilt.

Description

동력휠체어{auto wheelchair}Powered wheelchair

본 발명은 동력휠체어에 관한 것으로서, 보다 상세하게는 계단을 손쉽게 오르내릴 수 있도록 된 새로운 구조의 동력휠체어에 관한 것이다.The present invention relates to a power wheelchair, and more particularly, to a power wheelchair of a new structure that can be easily up and down stairs.

일반적으로, 장애자나 노약자 또는 환자들이 사용하는 휠체어는 시트의 양측에 직경이 큰 휠을 장착하고, 시트의 앞쪽에 직경이 작은 보조휠을 장착하여, 상기 휠을 손으로 밀어서 전진할 수 있도록 구성된다. 이러한 휠체어는 그 구조가 매우 단순하여 저렴한 장점이 있으나, 팔에 장애가 있거나 힘이 약한 사람은 휠체어를 밀수 없는 문제점이 있었다.In general, a wheelchair used by a person with a disability, an elderly person, or a patient is configured to mount a large diameter wheel on both sides of the seat and a small auxiliary wheel on the front of the seat so that the wheel can be pushed forward by hand. . Such a wheelchair is very simple in structure and inexpensive, but there is a problem that a person with a disability or a weak arm cannot push the wheelchair.

따라서, 구동모터를 이용하여 휠체어를 구동시킬 수 있도록 된 전동휠체어가 개발되었다. 그런데, 이러한 전동휠체어는 시트의 양측에 구비된 한쌍의 휠과, 시트의 앞쪽에 장착된 보조휠만으로 시트를 지지하므로, 외출시에 주로 만나게 되는 작은 장애물을 넘지 못하는 것은 물론, 계단 등을 올라가지 못하므로, 실생활에는 거의 사용되지 못하는 문제점이 있었다.Therefore, an electric wheelchair has been developed that can drive a wheelchair using a drive motor. However, the electric wheel chair supports the seat only with a pair of wheels provided on both sides of the seat, and an auxiliary wheel mounted at the front of the seat, so that it does not go over the small obstacles that are mainly encountered when going out, and also cannot climb stairs. Therefore, there was a problem that can hardly be used in real life.

본 발명은 상기의 문제점을 해결하기 위한 것으로서, 본 발명의 목적은 계단을 손쉽게 오르내릴 수 있도록 된 새로운 구조의 동력휠체어를 제공하는 것이다.The present invention is to solve the above problems, it is an object of the present invention to provide a power wheelchair of a new structure that can be easily up and down stairs.

도 1은 본 발명에 따른 동력휠체어를 도시한 측면도1 is a side view showing a power wheelchair according to the present invention;

도 2는 도 1의 평면도2 is a plan view of FIG. 1

도 3 및 도 4는 상기 동력휠체어의 사용상태를 도시한 참고도3 and 4 is a reference diagram showing a state of use of the power wheelchair.

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

2. 시트 4. 본체2. Sheet 4. Body

6. 무한궤도 24. 조향륜6. Caterpillar 24. Steering wheel

26. 조향핸들 30. 보조휠26. Steering wheel 30. Auxiliary wheel

본 발명에 따르면, 본체(4)와, 이 본체의 하부양측에 장착되어 구동장치에 의해 구동되는 무한궤도(6)와, 이 본체(4)에 설치된 시트(2)와, 상기 본체(4)의 전방에 설치된 조향륜(24)과, 이 조향륜(24)에 연결된 조향핸들(26)과, 지면과 소정간격을 이루도록 이 조향륜(24)의 전방상측에 설치된 보조휠(30)을 포함하여 구성되는 것을 특징으로 하는 동력휠체어가 제공된다.According to the present invention, the main body 4, the endless track 6 mounted on both lower sides of the main body and driven by a drive device, the seat 2 provided on the main body 4, and the main body 4 A steering wheel 24 provided at the front of the steering wheel, a steering wheel 26 connected to the steering wheel 24, and an auxiliary wheel 30 provided at the front upper side of the steering wheel 24 so as to form a predetermined distance from the ground. Power wheelchair is provided, characterized in that configured.

본 발명의 다른 특징에 따르면, 상기 시트(2)는 본체(4)에 설치된 수평유지장치(12)에 설치되며, 상기 수평유지장치(12)는 상기 본체(4)의 상면에 설치된 지지대(14)와, 이 지지대(14)에 전후방향으로 회동가능하게 설치되며 그 상면에 상기 시트(2)가 장착되는 수평케이블(16)과, 이 수평케이블(16)에 연결되어 상기 본체(4)의 전후방 기울기에 따라 수평케이블(16)을 전후회동시키는 회동수단(18)을 포함하여 구성되는 것을 특징으로 하는 동력휠체어가 제공된다.According to another feature of the invention, the seat 2 is installed in the horizontal holding device 12 installed in the main body 4, the horizontal holding device 12 is a support 14 installed on the upper surface of the main body 4 And a horizontal cable 16 mounted on the support 14 so as to be rotatable in the front-rear direction and on which the seat 2 is mounted, and connected to the horizontal cable 16, A power wheelchair is provided comprising a rotating means 18 for rotating the horizontal cable 16 back and forth according to the forward and backward tilt.

이하, 본 발명의 바람직한 실시예를 첨부한 도면에 의거하여 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

도 1 및 도 2는 본 발명에 따른 동력휠체어를 도시한 것으로, 상측에 시트(2)가 설치되는 본체(4)의 양측에는 도시안된 모터에 의해 구동되는 한쌍의 무한궤도(6)가 설치된다. 상기 무한궤도(6)는 본체(4)의 전후방 양측에 설치된 한쌍의 구동륜(8)에 고무재질의 벨트(10)를 걸어 구성된다. 따라서, 상기 모터로 무한궤도(6)를 구도시켜 주행할 수 있으며, 작은 턱을 넘거나, 계단을 올라갈 수 있다.1 and 2 illustrate a power wheelchair according to the present invention, and a pair of endless tracks 6 driven by a motor not shown are installed on both sides of the main body 4 on which the seat 2 is installed. . The track 6 is formed by hanging a belt 10 made of rubber material on a pair of drive wheels 8 provided on both front and rear sides of the main body 4. Therefore, the crawler 6 may be driven by the motor, and may travel over the small jaw or climb the stairs.

상기 시트(2)는 본체(4)의 상측에 설치된 수평유지장치(12)에 설치된다. 이 수평유지장치(12)는 본체(4)의 상면에 설치된 지지대(14)와, 이 지지대(14)의 상단에 전후방으로 회동가능하게 설치되며 그 상면에 상기 시트(2)가 설치되는 수평케이블(16)과, 상기 본체(4)의 전후방 기울기에 따라 수평케이블(16)을 전후회동시키는 회동수단(18)으로 구성된다. 이 회동수단(18)은 상기 지지대(14)와 수평케이블(16)에 연결된 실린더(20)를 이용하여, 실린더(20)의 신축에 따라 수평케이블(16)을 전후방으로 회동시킬 수 있도록 구성된다. 따라서, 본체(4)가 턱을 넘거나, 계단을 올라갈 때, 본체(4)의 전후방 기울기에 따라 자동으로 시트(2)를 회동시켜 수평을 유지하여, 운전자가 불편을 느끼는 것을 방지할 수 있다. 본 실시예는 상기 실린더(20)를 이용하여 회동수단(18)을 구성하였으나, 이러한 실린더(20) 이외에, 상기 수평케이블을 회동시킬 수 있는 것은 어떠한 것도 가능하다.The sheet 2 is installed in the horizontal holding device 12 provided on the upper side of the main body (4). The horizontal holding device 12 is a support 14 provided on the upper surface of the main body 4, a horizontal cable is installed to be rotated forward and backward on the upper end of the support 14, the horizontal cable on which the seat 2 is installed And a rotating means 18 for rotating the horizontal cable 16 back and forth in accordance with the forward and backward tilt of the main body 4. The rotating means 18 is configured to rotate the horizontal cable 16 forward and backward according to the expansion and contraction of the cylinder 20 by using the cylinder 20 connected to the support 14 and the horizontal cable 16. . Therefore, when the main body 4 crosses the chin or climbs up the stairs, the seat 2 is automatically rotated and leveled according to the forward and backward inclination of the main body 4, thereby preventing the driver from feeling uncomfortable. . In the present embodiment, the rotating means 18 is configured by using the cylinder 20. However, in addition to the cylinder 20, the horizontal cable can be rotated.

그리고, 상기 본체(4)의 전방에는 별도의 브라켓(22)이 설치되며, 이 브라켓(22)에는 한쌍의 조향륜(24)과 이 조향륜(24)에 연결된 조향핸들(26)이 설치된다. 상기 조향핸들(26)은 상기 브라켓(22)에 회전가능하게 장착되며, 그 하단에는 지지축(28)이 구비되어, 이 지지축(28)의 양측에 상기 조향륜(24)이 설치된다. 이 조향륜(24)은 상기 조향핸들(26)의 조작에 따라 방향전환되어 본체(4)의 진행방향을 조절하는 것으로, 상기 무한궤도(6)의 구동륜(8)에 비해 지름이 크게 형성된다. 이때, 이 조향륜(24)은 별도의 구동기구에 의해 무한궤도(6)의 모터에 연결되어, 자체적으로 구동되도록 구성된다. 따라서, 상기 조향핸들(26)로 조향륜(24)을 조절하여 본체(4)의 주행중 손쉽게 진행방향을 바꿀 수 있다.In addition, a separate bracket 22 is installed at the front of the main body 4, and a pair of steering wheels 24 and a steering wheel 26 connected to the steering wheels 24 are installed at the brackets 22. . The steering wheel 26 is rotatably mounted to the bracket 22, and a support shaft 28 is provided at a lower end thereof, and the steering wheel 24 is installed at both sides of the support shaft 28. The steering wheel 24 is changed in accordance with the manipulation of the steering wheel 26 to adjust the traveling direction of the main body 4, and the diameter of the steering wheel 24 is larger than that of the driving wheel 8 of the endless track 6. . At this time, the steering wheel 24 is connected to the motor of the caterpillar 6 by a separate drive mechanism, and is configured to be driven by itself. Therefore, the steering wheel 24 may be adjusted by the steering wheel 26 to easily change the traveling direction of the main body 4 while driving.

그리고, 이 조향륜(24)의 전방상측에는 별도의 보조휠(30)이 설치된다. 이 보조휠(30)은 상기 조향륜(24)에 비해 지름이 작게 구성된 것으로, 지면과 소정간격을 유지하도록 상기 지지축(28)에 링크기구(32)로 연결되며, 도시안된 별도의 완충장치로 상기 브라켓(22)에 연결된다. 따라서, 계단을 올라갈 때는, 도 3에 도시한 바와 같이, 보조휠(30)이 계단에 먼저 닿아 본체(4)의 전방을 들어올리므로, 계단을 손쉽게 올라갈 수 있으며, 계단을 내려갈 때는, 도 4에 도시한 바와 같이, 보조휠(30)이 지면에 먼저닿아 충격을 흡수할 수 있다. 이때, 본체(4)의 전후방 기울기에 따라, 상기 수평유지장치(12)가 작동되어 시트(2)의 수평을 유지한다.In addition, an additional auxiliary wheel 30 is provided on the front upper side of the steering wheel 24. The auxiliary wheel 30 is configured to have a smaller diameter than the steering wheel 24, and is connected to the support shaft 28 by a link mechanism 32 to maintain a predetermined distance from the ground, and a separate shock absorber (not shown). To the bracket 22. Therefore, when climbing the stairs, as shown in FIG. 3, since the auxiliary wheel 30 first touches the stairs and lifts the front of the main body 4, the stairs can be easily climbed. As shown, the auxiliary wheel 30 can first touch the ground to absorb the impact. At this time, according to the forward and backward tilt of the main body 4, the horizontal holding device 12 is operated to maintain the level of the sheet (2).

설명하지 않은 도면번호 36은 상기 수평유지장치(12)를 덮는 커버를 도시한 것이다.Reference numeral 36, which has not been described, shows a cover covering the horizontal holding device 12.

이와같이 구성된 동력휠체어는 무한궤도(6)를 이용하여 주행하므로, 작은 턱은 손쉽게 넘을 수 있을 뿐 아니라, 계단을 오르내릴 수 있으며, 상기 조향핸들(26)과 조향륜(24)을 이용하여 손쉽게 방향전환을 할 수 있는 장점이 있다. 또한, 상기 보조휠(30)을 이용하여, 손쉽게 계단을 올라갈 수 있으며, 계단을 내려올 때, 충격이 발생되는 것을 방지할 수 있다. 그리고, 상기 수평유지장치(12)를 이용하여, 항상 시트(2)의 수평을 유지할 수 있으므로, 운전자가 불편을 느끼는 것을 방지할 수 있는 장점이 있다.Since the power wheelchair configured as described above travels using the caterpillar 6, the small jaws can not only be easily passed, but also the stairs can be climbed up and down, and the steering wheel 26 and the steering wheel 24 can be easily oriented. There is an advantage to switching. In addition, by using the auxiliary wheel 30, the stairs can be easily climbed, and when descending the stairs, it is possible to prevent the impact from occurring. And, by using the horizontal holding device 12, it is possible to always maintain the horizontal of the seat 2, there is an advantage that can prevent the driver from feeling uncomfortable.

이상에서와 같이 본 발명에 의하면, 무한궤도를 이용하여 주행하는 본체의 전방에 조향륜과 보조휠을 설치하고, 상기 본체의 상측에 시트의 수평을 유지하는 수평유지장치를 장착하므로써, 계단을 손쉽게 오르내릴 수 있도록 된 새로운 구조의 동력휠체어를 제공할 수 있다.As described above, according to the present invention, the stairs can be easily installed by installing a steering wheel and an auxiliary wheel in front of the main body traveling by using the endless track, and by installing a horizontal holding device for keeping the seat level above the main body. It can provide a power wheelchair with a new structure that can be moved up and down.

Claims (2)

본체(4)와, 이 본체의 하부양측에 장착되어 구동장치에 의해 구동되는 무한궤도(6)와, 이 본체(4)에 설치된 시트(2)와, 상기 본체(4)의 전방에 설치된 조향륜(24)과, 이 조향륜(24)에 연결된 조향핸들(26)과, 지면과 소정간격을 이루도록 이 조향륜(24)의 전방상측에 설치된 보조휠(30)을 포함하여 구성되는 것을 특징으로 하는 동력휠체어.Main body 4, endless tracks 6 mounted on both lower sides of the main body and driven by a drive device, seats 2 provided on the main body 4, and steering provided in front of the main body 4; A wheel 24, a steering wheel 26 connected to the steering wheel 24, and an auxiliary wheel 30 provided above the steering wheel 24 so as to form a predetermined distance from the ground. Powered wheelchairs. 제 1항에 있어서, 상기 시트(2)는 본체(4)에 설치된 수평유지장치(12)에 설치되며, 상기 수평유지장치(12)는 상기 본체(4)의 상면에 설치된 지지대(14)와, 이 지지대(14)에 전후방향으로 회동가능하게 설치되며 그 상면에 상기 시트(2)가 장착되는 수평케이블(16)과, 이 수평케이블(16)에 연결되어 상기 본체(4)의 전후방 기울기에 따라 수평케이블(16)을 전후회동시키는 회동수단(18)을 포함하여 구성되는 것을 특징으로 하는 동력휠체어.2. The seat (2) according to claim 1, wherein the seat (2) is installed in a horizontal holding device (12) installed in the main body (4), and the horizontal holding device (12) is provided with a support (14) installed on an upper surface of the main body (4). A horizontal cable 16 mounted on the support 14 in a forward and backward direction and mounted on the upper surface thereof, and a horizontal cable 16 mounted on the upper surface thereof, and connected to the horizontal cable 16 to tilt the front and rear sides of the main body 4. Power wheelchair characterized in that it comprises a rotating means for rotating the horizontal cable 16 in accordance with (18).
KR1019990039471A 1999-09-15 1999-09-15 auto wheelchair Expired - Fee Related KR100332361B1 (en)

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WO2004006823A1 (en) * 2002-07-13 2004-01-22 Nag-Bok Lim Wheelchair with forced driven front caterpillar wheels.
KR100468142B1 (en) * 2001-12-31 2005-01-26 장병욱 Carrier Mechanism
KR20170002568U (en) 2016-01-06 2017-07-17 전남도립대학교산학협력단 Motorized trac-chair for elderly and people with disabilities

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KR100650034B1 (en) * 2005-12-02 2006-11-27 허기호 Baby strollers with wheels for stairs
KR101150165B1 (en) * 2010-08-04 2012-05-25 한밭대학교 산학협력단 Staircase passable wheelchair
CN105109565B (en) * 2015-09-01 2018-07-10 陈丽冰 Running gear and electric bicycle and toy equipped with the same
KR102046151B1 (en) 2017-12-05 2019-11-19 전승욱 Electric drivr type wheelchair with stairs going up and down function

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KR100468142B1 (en) * 2001-12-31 2005-01-26 장병욱 Carrier Mechanism
WO2004006823A1 (en) * 2002-07-13 2004-01-22 Nag-Bok Lim Wheelchair with forced driven front caterpillar wheels.
KR20170002568U (en) 2016-01-06 2017-07-17 전남도립대학교산학협력단 Motorized trac-chair for elderly and people with disabilities

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