Patent US4575113A successfully refreshed from Google Patents.
US4575113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheelchair kit for a folding chair
Assignee: Individual
•
Filing: 1984-06-04
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Granted: 1986-03-11
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Expires: 2004-06-04
Abstract
Abstract A kit for attaching a set of wheels to a folding chair, thereby making it into a wheelchair combination for non-ambulatory persons. The kit consists of two side braces and two cross braces that are detachably connected at the ends by means of corner joints so that they form a frame with wheels attached to its underside. Hook bolts with wing nuts are used to connect the frame to the folding chair for quick attachment. The side braces can be folded back at one end to form foot rests.
Inventors
- 👤 Dennis D. Boudreau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:54
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/002; A47C7/006; Y; Y10; Y10S; Y10S297/00; Y10S297/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
A wheel chair kit for a folding chair, the kit comprising: two side braces; a front and a rear cross brace; corner joints for detachably attaching the cross braces to the side braces at their ends for forming a rectangular frame having four corners; four wheels attached to the underside of the cross braces proximal to the corners; means for detachably attaching the folding chair to the top side of the frame, thereby forming a wheelchair assembly; said corner joints comprising four outside collars rigidly, transversely attached to the underside of said cross braces for slidably receiving said side braces; said side braces being curved back at one end to form a curved section and a short straight shank section, said curved section forming a foot rest for a person sitting in the chair; two inside collars rigidly, transversely attached to the underside of said front cross brace, spaced apart a shorter distance than said two outside collars on the front cross brace, for receiving the short shanks of the side braces.
Claim 2
Dependent Claim
172 words
A wheel chair kit for a folding chair, the kit comprising: two side braces; a front and a rear cross brace; corner joints for detachably attaching the cross braces to the side braces at their ends for forming a rectangular frame having four corners; four wheels attached to the underside of the cross braces proximal to the corners; means for detachably attaching the folding chair to the top side of the frame, thereby forming a wheelchair assembly; said corner joints comprising four outside collars rigidly, transversely attached to the underside of said cross braces for slidably receiving said side braces; said side braces being curved back at one end to form a curved section and a short straight shank section, said curved section forming a foot rest for a person sitting in the chair; two inside collars rigidly, transversely attached to the underside of said front cross brace, spaced apart a shorter distance than said two outside collars on the front cross brace, for receiving the short shanks of the side braces.
Claim 3
Dependent Claim
21 words
A wheelchair kit according to claim 1 wherein the two rear wheels are caster wheels for making the wheelchair kit steerable.
Claim 4
Dependent Claim
45 words
A wheelchair kit according to claim 1 wherein said means for attaching said folding chair to said frame comprises a plurality of hook bolts, each hook bolt having a threaded shank and a wing nut for detachably attaching said folding chair to said cross braces.
Claim 5
Dependent Claim
16 words
A wheelchair kit according to claim 1 wherein said side braces are made of tubular stock.
Claim 6
Dependent Claim
16 words
A wheelchair kit according to claim 4 wherein said cross braces are made of channel stock.
Claim 7
Dependent Claim
114 words
A wheel chair kit for a folding chair, the kit comprising: two side braces; a front and a rear cross brace; corner joints for detachably attaching the cross braces to the side braces at their ends for forming a rectangular frame having four corners; four wheels attached to the underside of the cross braces proximal to the corners; means for detachably attaching the folding chair to the top side of the frame, thereby forming a wheelchair assembly, stop rings having a screw across a radial slot in the stop ring for securing the stop rings to the side braces and for preventing axial movement of said side brace in relation to said cross braces.
Claim 8
Dependent Claim
114 words
A wheel chair kit for a folding chair, the kit comprising: two side braces; a front and a rear cross brace; corner joints for detachably attaching the cross braces to the side braces at their ends for forming a rectangular frame having four corners; four wheels attached to the underside of the cross braces proximal to the corners; means for detachably attaching the folding chair to the top side of the frame, thereby forming a wheelchair assembly, stop rings having a screw across a radial slot in the stop ring for securing the stop rings to the side braces and for preventing axial movement of said side brace in relation to said cross braces.
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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) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |