US3749192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible wheel chair
Assignee: Individual
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Filing: 1971-07-16
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Granted: 1973-07-31
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Expires: 1991-07-16
Abstract
Abstract A collapsible wheel chair comprises: A. A BASE CARRYING WHEEL MEANS, B. A SEAT UNIT, AND C. THERE BEING TUBULAR SHAFT MEANS CARRIED BY THE BASE AND SEAT UNIT TO PROVIDE A RESILIENTLY YIELDABLE SUPPORT FOR THE SEAT, AND HAVING RELEASABLE TELESCOPIC INTERCONNECTION CHARACTERIZED IN THAT LOADING TRANSMITTED VIA SAID SHAFT MEANS FROM THE SEAT UNIT TO THE BASE FRICTIONALLY INTERLOCKS SAID TELESCOPIC INTERCONNECTION.
Inventors
- 👤 A Karchak
- 👤 J Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:19
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/08; A61G5/04; A61G5/041; A61G5/045; A61G5/0875; A61G5/0891; A61G5/10; A61G5/12; A61G5/125; A61G5/128; A61G2203/00; A61G2203/10; A61G2203/14; Y; Y10; Y10S; Y10S180/00; Y10S180/907; Y10S297/00; Y10S297/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
243 words
In a collapsible wheel chair, the combination comprising a. a base unit including a platform carrying wheel means, and a first pair of shafts having terminals projecting upwardly from the forward extent of the base unit, b. a seat unit including a seat and a second pair of shafts projecting forwardly and rearwardly beneath the top of the seat and having forward terminals projecting downwardly for releasable telescopic interconnection with the terminals of the first pair of shafts, the second pair of shafts also having rearward terminals projecting upwardly rearwardly of the seat, the seat unit including additional shaft side terminals projecting sidewardly and in pairs at opposite sides of the unit and beneath the top level of the seat, c. a back rest unit including a third pair of shafts having terminals projecting downwardly for releasable telescopic interconnection with the upwardly projecting rearward terminals of the second pair of shaftS, and d. a pair of arm rest units each including a fourth pair of shafts having terminals projecting sidewardly for releasable telescopic interconnection with a pair of said additional shaft side terminals projecting at a side of said seat unit, e. said seat unit being connected to said back rest unit, arm rest units and base unit solely via said terminal interconnections, f. whereby the seat unit may be completely and rapidly disconnected from the base unit, back rest unit and arm rest units, as during transportation of all of said units.
Claim 2
Dependent Claim
243 words
In a collapsible wheel chair, the combination comprising a. a base unit including a platform carrying wheel means, and a first pair of shafts having terminals projecting upwardly from the forward extent of the base unit, b. a seat unit including a seat and a second pair of shafts projecting forwardly and rearwardly beneath the top of the seat and having forward terminals projecting downwardly for releasable telescopic interconnection with the terminals of the first pair of shafts, the second pair of shafts also having rearward terminals projecting upwardly rearwardly of the seat, the seat unit including additional shaft side terminals projecting sidewardly and in pairs at opposite sides of the unit and beneath the top level of the seat, c. a back rest unit including a third pair of shafts having terminals projecting downwardly for releasable telescopic interconnection with the upwardly projecting rearward terminals of the second pair of shaftS, and d. a pair of arm rest units each including a fourth pair of shafts having terminals projecting sidewardly for releasable telescopic interconnection with a pair of said additional shaft side terminals projecting at a side of said seat unit, e. said seat unit being connected to said back rest unit, arm rest units and base unit solely via said terminal interconnections, f. whereby the seat unit may be completely and rapidly disconnected from the base unit, back rest unit and arm rest units, as during transportation of all of said units.
Claim 3
Dependent Claim
12 words
The combination of claim 1 wherein all of said shafts are tubular.
Claim 4
Dependent Claim
29 words
The combination of claim 1 including a foot rest unit, and further shaft means carried by the foot rest unit and said base unit and having releasable telescopic interconnection.
Claim 5
Dependent Claim
73 words
The combination of claim 1 including a battery power unit carried by the base, means for interconnecting said power unit and wheel means, and a manually operable directional control connected with said means to selectively control power transmission to the wheel means to drive the chair in a direction corresponding to directional movement of said control, said manually operated control carried by and generally forwardly of one of said removable arm rest units.
Claim 6
Dependent Claim
58 words
The combination of claim 4 wherein the means for interconnecting the power unit and wheel means includes a first reversible electrical motor operatively connected to a left rear wheel, a second reversible electrical motor operatively connected to a right rear wheel, and electrical circuitry responsive to said directional control to selectively control electrical power delivery to said motors.
Claim 7
Dependent Claim
29 words
The combination of claim 5 wherein said circuitry includes four switches to control forward and reverse power delivery to said motors in response to operation of said directional control.
Claim 8
Dependent Claim
58 words
The combination of claim 6 including resistance through which electrical current is delivered to said motors to limit power application to said wheel means, and a relay including another switch operable to bypass said resistance to permit increased power delivery to said wheel means only after a predetermined time elapse following closure of one of said four switches.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |