An electric wheelchair suspension includes a supporting frame unit and two linkages. The supporting frame unit includes a bottom frame, two posts, and two main rods. Each of the linkages includes an upper link, a lower link, a front caster rod, a bottom link, and a rear link. The upper links are con
An electric wheelchair suspension includes a supporting frame unit and two linkages. The supporting frame unit includes a bottom frame, two posts, and two main rods. Each of the linkages includes an upper link, a lower link, a front caster rod, a bottom link, and a rear link. The upper links are connected respectively and pivotally to the main rods. The lower links are connected respectively and pivotally to the posts. Each of the front caster rods is connected pivotally to the upper and lower links of a corresponding one of the linkages. The bottom links are connected pivotally to the bottom frame. Each of the rear links is connected pivotally to a corresponding one of the upper links and a corresponding one of the bottom links.
대표청구항▼
We claim: 1. An electric wheelchair suspension comprising: a supporting frame unit including a bottom frame, two posts extending respectively and upwardly from two opposite sides of a front end of said bottom frame, and two main rods connected respectively and fixedly to and extending rearwardly fr
We claim: 1. An electric wheelchair suspension comprising: a supporting frame unit including a bottom frame, two posts extending respectively and upwardly from two opposite sides of a front end of said bottom frame, and two main rods connected respectively and fixedly to and extending rearwardly from said posts, said bottom frame having two aligned first pivot portions disposed respectively at two opposite sides thereof, each of said posts having a second pivot portion, each of said main rods having a third pivot portion; a linkage unit including two linkages disposed respectively on two opposite sides of said supporting frame unit, each of said linkages including an upper link connected pivotally to said third pivot portion of a corresponding one of said main rods and extending in a front-to-rear direction, said upper link having a front pivot portion disposed in front of said third pivot portion of said corresponding one of said main rods, and a rear pivot portion disposed behind said third pivot portion of said corresponding one of said main rods, a lower link connected pivotally to said second pivot portion of a corresponding one of said posts and having a front pivot portion disposed in front of said second pivot portion of said corresponding one of said posts, a front caster rod connected pivotally to said front pivot portions of said upper and lower links, a bottom link connected pivotally to a corresponding one of said first pivot portions of said bottom frame and having a rear pivot portion disposed behind said corresponding one of said first pivot portions of said bottom frame, and a rear link connected pivotally to said rear pivot portions of said upper link and said bottom link; a wheel unit disposed on an assembly of said supporting frame unit and said linkage unit; and a driving unit for driving said wheel unit. 2. The electric wheelchair suspension as claimed in claim 1, wherein said linkage unit further includes: two coiled first compression springs each having two ends fastened respectively to said supporting frame unit and said upper link of a corresponding one of said linkages; and two coiled second compression springs each having two ends fastened respectively to a corresponding one of said rear links and a corresponding one of said main rods of said supporting frame unit. 3. The electric wheelchair suspension as claimed in claim 2, wherein each of said first pivot portions of said bottom frame and said second pivot portions of said posts is configured as a horizontal pin, said supporting frame unit further including two connecting plates each having two ends sleeved respectively on a corresponding one of said first pivot portions of said bottom frame and said second pivot portion of a corresponding one of said posts in a close fitting manner, said ends of said first compression spring of said linkage unit being fastened respectively to a corresponding one of said connecting plates and said upper link of said corresponding one of said linkages. 4. The electric wheelchair suspension as claimed in claim 3, wherein said wheel unit includes two driving wheels, said driving unit including two speed reduction gearboxes disposed respectively on said bottom links of said linkages for driving said driving wheels, respectively, and two motors for driving said speed reduction gearboxes, respectively. 5. The electric wheelchair suspension as claimed in claim 4, wherein said wheel unit further includes two front casters disposed respectively and rotatably on said front caster rods of said linkages, and two rear casters disposed respectively and rotatably on said main rods of said supporting frame unit. 6. The electric wheelchair suspension as claimed in claim 1, wherein said supporting frame unit further includes a rear plate extending upwardly from a rear end of said bottom frame and connected fixedly to said main rods. 7. The electric wheelchair suspension as claimed in claim 1, wherein said wheel unit includes two driving wheels, said driving unit including two speed reduction gearboxes disposed on respectively on said bottom links of said linkages for driving said driving wheels, respectively, and two motors for driving said speed reduction gearboxes, respectively. 8. The electric wheelchair suspension as claimed in claim 7, wherein said wheel unit further includes two front casters disposed respectively and rotatably on said front caster rods of said linkages, and two rear casters disposed respectively and rotatably on said main rods of said supporting frame unit. 9. The electric wheelchair suspension as claimed in claim 8, wherein said supporting frame unit further includes a rear plate extending upwardly from a rear end of said bottom frame and connected fixedly to said main rods.
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이 특허에 인용된 특허 (8)
Wakefield, II,Theodore D., Integral joystick display for a powder driven wheelchair.
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