US4771839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stair-climbing wheelchair carrier
Assignee: SUNWA SHARYO MANUFACTURING Co Ltd A CORP OF JAPAN
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Filing: 1987-06-01
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Granted: 1988-09-20
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Expires: 2007-06-01
Abstract
Abstract A stair-climbing wheelchair carrier, comprising a carrier portion comprising a pair of endless belt crawlers, and a handle portion rotatably and detachably provided on the carrier. The handle portion is adapted to be rotated between an operating position and a wheelchair engaging position. The endless belt crawler has an oblique overhand portion which has a height higher than a usual height of a step of stair. A guide body is provided to mount a wheelchair secured to the handle portion so as to be rotated together with the handle portion to the operating position.
Inventors
- 👤 Rintaro Misawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:16
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/06; A61G5/061; A61G5/066; B; B62; B62D; B62D55/00; B62D55/06; B62D55/075; A61G3/00; A61G3/02; A61G3/06; A61G3/061; Y; Y10; Y10S; Y10S280/00; Y10S280/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
A stair-climbing wheelchair carrier having a carrier portion comprising a frame, a pair of endless belt crawlers and a driving motor; each of said endless belt crawlers having a span extending over two steps and an oblique overhang portion at one end of said frame which has a height higher than a usual height of a step of stair; a handle portion rotatably and detachably provided on said carrier portion; said handle portion being adapted to be pivoted between an upright position and an inclined position; means for securing said handle portion to said frame; the carrier comprising: a pair of wheel guide plates provided on both sides of the carrier and secured to a lower portion of said handle portion so as to be pivoted together with the handle portion and provided for guiding and mounting wheels of a wheelchair; and a pair of caster guide plates each of which is pivotally connected to a front end of said wheel guide plates, and provided for guiding wheels and casters of the wheelchair and for mounting the casters.
Claim 2
Dependent Claim
178 words
A stair-climbing wheelchair carrier having a carrier portion comprising a frame, a pair of endless belt crawlers and a driving motor; each of said endless belt crawlers having a span extending over two steps and an oblique overhang portion at one end of said frame which has a height higher than a usual height of a step of stair; a handle portion rotatably and detachably provided on said carrier portion; said handle portion being adapted to be pivoted between an upright position and an inclined position; means for securing said handle portion to said frame; the carrier comprising: a pair of wheel guide plates provided on both sides of the carrier and secured to a lower portion of said handle portion so as to be pivoted together with the handle portion and provided for guiding and mounting wheels of a wheelchair; and a pair of caster guide plates each of which is pivotally connected to a front end of said wheel guide plates, and provided for guiding wheels and casters of the wheelchair and for mounting the casters.
Claim 3
Dependent Claim
29 words
The stair-climbing wheelchair carrier according to claim 1, further comprising a pair of ramp plates each of which is hinged with a front end of the caster guide plate.
Claim 4
Dependent Claim
30 words
The stair-climbing wheelchair carrier according to claim 1, wherein the caster guide plate is provided to be downwardly rotated with respect to the wheel guide plate at a predetermined angle.
References Cited (Backward Citations)
US4432426A
Cited
EP0213394A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |