Patent US3661228A successfully refreshed from Google Patents.
US3661228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheel chair lift
Assignee: Individual
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Filing: 1969-12-23
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Granted: 1972-05-09
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Expires: 1989-12-23
Abstract
Abstract A vertical wheelchair lift including a vertically movable horizontal platform having edge wheel curbs to prevent wheelchair dislodgement therefrom one of the curbs constituting a loading and unloading ramp selectively adjustable to a lowered wheelchair loading and unloading position and a raised curb position, and means on said lift selectively operable for raising and lowering the ramp, and for vertical movement of the platform. Operating control means are so located as preferably to be operable by a wheelchair occupant, but readily accessible for external use. The lift is ideally suited for use in conjunction with structures having entrance or other steps between levels which are not normally negotiable solely by a wheelchair user.
Inventors
- 👤 Jay L Glasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:00
CPC Classifications
B; B66; B66B; B66B9/00; B66B9/02; B66B9/025; A; A61; A61G; A61G3/00; A61G3/02; A61G3/06; A61G3/063
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
210 words
A wheel chair lift adapted for association with a multiple level structure comprising: A. a vertical frame means including a pair of spaced vertical posts; B. a horizontal platform; C. a cantilever platform support means connected at spaced positions to one edge of said platform and vertically movably engaged with said vertical posts of said vertical frame means; D. means operable for selectively raising and lowering said platform support means and said platform therewith, and a wheelchair and occupant thereon to and between different levels; E. edge curbs along sides of said platform to prevent wheel chair displacement therefrom; i. one said curb being pivotally attached to one side of said platform and movable into a raised wheel chair restraining position and lowered inclined wheel chair loading and unloading ramp position; and F. manual control operating means on said platform connected to said pivotally attached curb for selective positionment thereof; i. said operating means comprising a lever pivotally connected at one end to said curb, and a handle pivotally mounted on said platform intermediate opposite ends thereof and connected to the opposite end of said lever, said handle being positioned for ready access to a wheel chair occupant on said platform and upon pivotal actuation raising or lowering said curb.
Claim 2
Dependent Claim
210 words
A wheel chair lift adapted for association with a multiple level structure comprising: A. a vertical frame means including a pair of spaced vertical posts; B. a horizontal platform; C. a cantilever platform support means connected at spaced positions to one edge of said platform and vertically movably engaged with said vertical posts of said vertical frame means; D. means operable for selectively raising and lowering said platform support means and said platform therewith, and a wheelchair and occupant thereon to and between different levels; E. edge curbs along sides of said platform to prevent wheel chair displacement therefrom; i. one said curb being pivotally attached to one side of said platform and movable into a raised wheel chair restraining position and lowered inclined wheel chair loading and unloading ramp position; and F. manual control operating means on said platform connected to said pivotally attached curb for selective positionment thereof; i. said operating means comprising a lever pivotally connected at one end to said curb, and a handle pivotally mounted on said platform intermediate opposite ends thereof and connected to the opposite end of said lever, said handle being positioned for ready access to a wheel chair occupant on said platform and upon pivotal actuation raising or lowering said curb.
Claim 3
Dependent Claim
62 words
A wheelchair as claimed in claim 1, said curbs being fixed along two sides of said platform, said pivotally attached curb being attached to a third side and a reMaining side being unimpeded and adapted for juxtaposition at a level for wheelchair loading and unloading and intermediate the levels being adapted to proximate a structure portion for wheelchair confinement on said platform.
Claim 4
Dependent Claim
79 words
In a wheel chair lift adapted for association with a multiple level structure as claimed in Claim 13, said raising and lowering means comprising: a vertically disposed screw rotatably mounted on said platform, a toothed blade attached to said platform and in operable engagement with said screw, and means to rotate said screw selectively in opposite rotational directions whereby the engagement therewith of said blade will elevate or lower said platform and a wheel chair supported on said platform.
Claim 5
Dependent Claim
62 words
In a wheelchair lift as claimed in claim 3, a vertical frame secured to said platform, an open bracket secured to said frame, means defining a support guideway in said bracket, said toothed blade being slidably engaged in and removable from said guideway, and means operatively associated with said bracket and said blade for adjustable engagement between said blade and said screw.
Claim 6
Dependent Claim
33 words
In a wheelchair lift as claimed in claim 4, a vertical housing containing said screw, a rectilinear slot through said casing, said toothed blade extending through said slot for engagement with said screw.
Claim 7
Dependent Claim
77 words
In a wheelchair lift as claimed in claim 5, a structural member transversely slidably and removably disposed in said guideway, said blade being vertically affixed to said structural member, a plate secured to said bracket and having a threaded bore therethrough, a screw engaging in said bore and having an end thereof engageable with said structural member and adapted upon rotation to adjustably engage said blade and said screw by movement of said member in said guideway.
Claim 8
Dependent Claim
52 words
In a wheelchair lift as claimed in claim 4, including vertical partially rectilinearly closed channel members disposed transversely of said bracket and interiorly thereof defining trackways, wheels rotatably mounted on said bracket and operatively engaged in said trackways, said wheels and trackways coacting to form a rolling horizontal support for said platform.
Claim 9
Dependent Claim
29 words
In a wheelchair lift as claimed in claim 3, a reversible electric motor, a transmission attached to said motor, and drive means operatively interconnecting said transmission and said screw.
Claim 10
Dependent Claim
40 words
In a wheelchair lift as claimed in claim 8, including control means operable for selective reverse actuation of said motor to raise or lower said platform, said control means being positioned for access to a wheelchair occupant on said platform.
Claim 11
Dependent Claim
40 words
In a wheelchair lift as claimed in claim 11, upper and lower limit switches interposed in the path of travel of said platform for predetermined upper and lower limits of travel thereof, said switches being operatively connected to said motor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |