Patent US4689857A successfully refreshed from Google Patents.
Patent US4223944A successfully refreshed from Google Patents.
US4223944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retractable wheelchair tray mechanism
Assignee: Individual
•
Filing: 1979-04-02
•
Granted: 1980-09-23
•
Expires: 1999-04-02
Abstract
Abstract A convenient tray is provided for a wheelchair wherein the tray retracts onto a housed roll mounted beneath one armrest of a conventional wheelchair and extends across the lap of the wheelchair victim to be engaged by a releasable catch mechanism beneath the opposite armrest. The sheet material of which the tray is made has a transverse upwardly convex arch over its length to provide it with rigidity when it is extended in the manner conventionally subscribed to by tape measures, this sheet becoming flexible in the longitudinal direction for rolling when the sheet is retracted onto its roller.
Inventors
- 👤 Harold D. DeLong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:47
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/10; A61G5/1094; A47; A47C; A47C7/00; A47C7/62; A47C7/68; A47C7/70; Y; Y10; Y10S; Y10S297/00; Y10S297/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
A retractable tray for a wheelchair having frame and two armrests, said tray comprising: (a) a roller mechanism and means to mount same to said frame adjacent one of said armrests and a return spring for said roller; (b) a releasable catch mechanism and means to mount same to a portion of said frame opposite said first armrest; (c) a resilient sheet mounted at one end to said roller and being coilable into a retracted position around said roller and extendable into an extended position engaged by said catch means; (d) said sheet defining a transverse upwardly convex arch across its width when extended to provide same with the structural strength necessary to pemit its use as a tray spanning the distance between said armrests without being under tension such that a one-armed or enfeebled person would be able to withdraw said mechanism against the spring load tension.
Claim 2
Dependent Claim
148 words
A retractable tray for a wheelchair having frame and two armrests, said tray comprising: (a) a roller mechanism and means to mount same to said frame adjacent one of said armrests and a return spring for said roller; (b) a releasable catch mechanism and means to mount same to a portion of said frame opposite said first armrest; (c) a resilient sheet mounted at one end to said roller and being coilable into a retracted position around said roller and extendable into an extended position engaged by said catch means; (d) said sheet defining a transverse upwardly convex arch across its width when extended to provide same with the structural strength necessary to pemit its use as a tray spanning the distance between said armrests without being under tension such that a one-armed or enfeebled person would be able to withdraw said mechanism against the spring load tension.
Claim 3
Dependent Claim
130 words
The structure according to claim 1 wherein said wheelchair has a frame and said frame includes a horizontal armrest support member beneath said first armrest, said roller mechanism includes a self-contained housing secured to said horizontal armrest support member, said releasable catch mechanism is mounted on a mounting bracket and said mounting bracket is mounted beneath the second armrest of said wheelchair, said resilient sheet has a leading edge bar, said catch mechanism comprises at least one detent biased to snap into engagement with said bar, and said catch mechanism includes a release bar extended alongside said second armrest such that upward pressure on said release bar releases said detent to permit an enfeebled or one-armed person to release said sheet by squeezing said bar upward toward the overlying armrest.
Claim 4
Dependent Claim
57 words
The structure according to claim 1 wherein said roller mechanism includes a housing comprising an elongated empty shell mountable beneath one of said armrests, a roller having said rewind spring thereon and insertable into one end of said shell, and a cap for said one end of said shell having means thereon to anchor said rewind spring.
References Cited (Backward Citations)
US1177862A
Cited
GB442274A
Cited
US2530239A
Cited
US2848291A
Cited
US3102500A
Cited
US3999798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |