Patent US4140341A successfully refreshed from Google Patents.
US4140341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible wheel chair frame having telescoping posts
Assignee: THERADYNE CORP
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Filing: 1977-10-03
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Granted: 1979-02-20
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Expires: 1997-10-03
Abstract
Abstract A frame for a collapsible wheel chair which permits custom tailoring of the chair to the size of the invalid with only minor modifications. The frame includes telescoping front posts which support horizontally extending arms to which a flexible seat is secured. A pair of cross struts are provided which are rotatably secured to the horizontally extending arms and to the bottom struts of the frame. When the chair is collapsed by bringing the two sides of the chair frame together, the telescoping post permits the horizontal arms to raise a distance determined by the length of the cross struts. Thus, during manufacture, the only parts that need be custom made to accommodate differing sized invalids is the length of the cross struts.
Inventors
- 👤 Adolph A. Rabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:55
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/08; A61G5/0808; A61G5/0816; A61G5/0825; Y; Y10; Y10S; Y10S297/00; Y10S297/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
A frame for a folding-type wheelchair comprising, in combination: (a) first and second side members, each including 1. a tubular bottom strut, 2. a rear tubular strut fixedly attached to said bottom tubular strut and extending upwardly therefrom, 3. a first front tubular strut fixedly attached to said bottom tubular strut and extending upwardly therefrom for a predetermined distance, 4. a tubular top strut having first and second ends, said first end slidably engaging said rear tubular strut, said top strut extending forwardly therefrom and being aligned substantially parallel to said bottom strut,
Claim 2
Dependent Claim
93 words
A frame for a folding-type wheelchair comprising, in combination: (a) first and second side members, each including 1. a tubular bottom strut, 2. a rear tubular strut fixedly attached to said bottom tubular strut and extending upwardly therefrom, 3. a first front tubular strut fixedly attached to said bottom tubular strut and extending upwardly therefrom for a predetermined distance, 4. a tubular top strut having first and second ends, said first end slidably engaging said rear tubular strut, said top strut extending forwardly therefrom and being aligned substantially parallel to said bottom strut,
Claim 3
Dependent Claim
263 words
a second tubular front strut coupled to said second end of said tubular top strut and extending downward therefrom a predetermined distance, and 6. a tubular member having an outer diameter less than the inner diameter of said first front tubular strut and an inner diameter greater than the outer diameter of said second front tubular strut, said tubular member being telescopically inserted into said first front tubular strut and said second front tubular strut being telescopically inserted into said tubular member; (b) a first tubular cross member rotatably coupled to the bottom tubular strut of said first side member and to the tubular top strut of said second side member; and (c) a second tubular cross member rotatably coupled to the bottom tubular strut of said second side member and to the tubular top strut of said first side member, said frame further including, a first cylindrical bushing disposed between said tubular member and said second front tubular strut; a second tubular bushing disposed between said tubular member and said first front tubular strut; and a slide member secured to the lower end of said second front tubular strut, said slide member having a diameter slightly less than said inner diameter of said tubular member; said first and second bushings and said slide member being formed from a nylon plastic material; and a third tubular bushing disposed between said tubular member and said first front tubular strut and secured to the lower end of said tubular member by a pin passing diametrically through said tubular member and into said third tubular bushing.
Claim 4
Dependent Claim
263 words
a second tubular front strut coupled to said second end of said tubular top strut and extending downward therefrom a predetermined distance, and 6. a tubular member having an outer diameter less than the inner diameter of said first front tubular strut and an inner diameter greater than the outer diameter of said second front tubular strut, said tubular member being telescopically inserted into said first front tubular strut and said second front tubular strut being telescopically inserted into said tubular member; (b) a first tubular cross member rotatably coupled to the bottom tubular strut of said first side member and to the tubular top strut of said second side member; and (c) a second tubular cross member rotatably coupled to the bottom tubular strut of said second side member and to the tubular top strut of said first side member, said frame further including, a first cylindrical bushing disposed between said tubular member and said second front tubular strut; a second tubular bushing disposed between said tubular member and said first front tubular strut; and a slide member secured to the lower end of said second front tubular strut, said slide member having a diameter slightly less than said inner diameter of said tubular member; said first and second bushings and said slide member being formed from a nylon plastic material; and a third tubular bushing disposed between said tubular member and said first front tubular strut and secured to the lower end of said tubular member by a pin passing diametrically through said tubular member and into said third tubular bushing.
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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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |