IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0373455
(2006-03-09)
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등록번호 |
US-7380824
(2008-06-03)
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발명자
/ 주소 |
- Chen,Yung Hsin
- Liao,Yung Yuan
|
출원인 / 주소 |
- Kwang Yang Motor Co., Ltd.
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대리인 / 주소 |
Frommer Lawrence & Haug LLP
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인용정보 |
피인용 횟수 :
30 인용 특허 :
2 |
초록
▼
A side frame assembly for an electric wheelchair suspension includes a supporting frame unit with a rider-supporting frame, a front caster frame, an upper link having a front end connected pivotally to the front caster frame, and a lower link disposed under the upper link and having a front end conn
A side frame assembly for an electric wheelchair suspension includes a supporting frame unit with a rider-supporting frame, a front caster frame, an upper link having a front end connected pivotally to the front caster frame, and a lower link disposed under the upper link and having a front end connected pivotally to the front caster frame. A drive wheel frame has a front lower end connected pivotally to a pivot portion of the supporting frame unit. A connecting frame has an upper pivot portion connected pivotally to a rear end of the upper link, a lower pivot portion connected pivotally to a rear end of the lower link, and a rear pivot portion connected pivotally to the rear upper end of the drive wheel frame.
대표청구항
▼
We claim: 1. A side frame assembly for an electric wheelchair suspension characterized by: a supporting frame unit including a rider-supporting frame, and a pivot portion connected fixedly to and disposed below said rider-supporting frame; a front caster assembly including a front caster frame disp
We claim: 1. A side frame assembly for an electric wheelchair suspension characterized by: a supporting frame unit including a rider-supporting frame, and a pivot portion connected fixedly to and disposed below said rider-supporting frame; a front caster assembly including a front caster frame disposed in front of said first frame unit, and a front caster disposed rotatably on said front caster frame; an upper link unit including an upper link having a front end connected pivotally to said front caster frame; a lower link unit including a lower link that is disposed under said upper link and that has a front end, which is connected pivotally to said front caster frame and which is disposed under said front end of said upper link; a drive wheel assembly including a drive wheel frame having a front lower end connected pivotally to said pivot portion of said supporting frame unit, and a rear upper end, a drive wheel disposed rotatably on said drive wheel frame, and a driving unit operable to rotate said drive wheel; and a connecting frame having an upper pivot portion connected pivotally to a rear end of said upper link, a lower pivot portion disposed under said upper pivot portion and connected pivotally to a rear end of said lower link, and a rear pivot portion that is disposed behind said upper and lower pivot portions, that is connected pivotally to said rear upper end of said drive wheel frame, and that is disposed under said rider-supporting frame of said supporting frame unit. 2. The side frame assembly as claimed in claim 1, further comprising a first resilient return device interconnecting said rider-supporting frame and said rear pivot portion of said connecting frame so as to bias said rear pivot portion upwardly toward said rider-supporting frame. 3. The side frame assembly as claimed in claim 1, further comprising a rear caster assembly that includes a rear caster frame connected fixedly to and disposed behind said rider-supporting frame, and a rear caster disposed rotatably on said rear caster frame. 4. The side frame assembly as claimed in claim 3, wherein, when said front and rear casters and said drive wheel are in contact with a horizontal surface, said upper and lower links are generally horizontal and parallel to each other so that, when a lower end of said front caster is below that of said drive wheel, said upper and lower links are inclined frontwardly and downwardly, and when said lower end of said front caster is above that of said drive wheel, said upper and lower links are inclined frontwardly and upwardly. 5. The side frame assembly as claimed in claim 4, wherein said pivot portion of said supporting frame unit is formed with a horizontal integral stop rod that is disposed under said lower link and that is generally perpendicular to said upper and lower links when said front and rear casters and said drive wheel are in contact with said horizontal surface; and said lower link unit further includes a curved limiting frame extending downwardly and rearwardly from a front portion of said lower link and having a rear end portion disposed under said stop rod of said supporting frame unit so as to confine said stop rod between said lower link and said limiting frame, said limiting frame being positioned such that, when said front end of said lower link pivots downwardly by a predetermined angle, said limiting frame comes into contact with said stop rod so as to prevent further downward pivoting movement of said lower link. 6. The side frame assembly as claimed in claim 5, further comprising a second resilient return device, said supporting frame unit further including a spring connecting portion connected fixedly to said rider-supporting frame and disposed under said limiting frame of said lower link unit, said second resilient return device interconnecting said spring connecting portion and said limiting frame so as to bias said limiting frame downwardly toward said spring connecting portion. 7. The side frame assembly as claimed in claim 5, wherein said lower link unit further includes a connecting rod having two ends connected respectively to said lower link and said limiting frame, said connecting rod being disposed in proximity to said stop rod and cooperating with said lower link and said limiting frame so as to define a limiting space, within which said stop rod is confined. 8. The side frame assembly as claimed in claim 3, wherein said rear caster is rotatable about a vertical axis. 9. The side frame assembly as claimed in claim 1, wherein said front caster is rotatable about a vertical axis. 10. The side frame assembly as claimed in claim 1, wherein said driving unit includes an electric motor disposed on said drive wheel frame.
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