Patent US3893708A successfully refreshed from Google Patents.
US3893708A
Expired / Lapsed
US
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Bearing assembly for wheelchair structures
Assignee: THERADYNE CORP
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Filing: 1974-02-06
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Granted: 1975-07-08
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Expires: 1994-02-06
Abstract
Abstract A wheel hub and bearing assembly for an invalid supporting wheelchair, wherein the bearing structure includes a pair of axially aligned bearings arranged in side-by-side relationship with a common journal shaft extending therethrough, and with a common outer race being provided for the bearing structure. The elongated journal shaft is received within a sleeve mounted upon the frame means of the wheelchair, and the individual bearing races are disposed in spaced-apart relationship to accommodate shock-loading of the chair structure. For ease of removal of the wheels, the sleeve which receives the journal shaft as well as the journal shaft per se is provided with a generally radially extending pin receiving bore, and a locking bolt or pin is normally received therewithin.
Inventors
- 👤 Richard D Moroney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:39
CPC Classifications
B; B62; B62B; B62B5/00; A; A61; A61G; A61G5/00; A61G5/10; A61G5/1083; B60; B60B; B60B27/00; B60B27/0005; Y; Y10; Y10S; Y10S297/00; Y10S297/04; Y10T; Y10T74/00; Y10T74/21; Y10T74/2164
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
213 words
In an invalid supporting wheelchair having frame means, seat means supported upon said frame means, and wheel receiving spindle means mounted upon said frame means, said wheel receiving spindle means comprising: a. wheel supporting spindle receiving sleeve means rigidly mounted upon said frame means, a bearing assembly having a journal shaft spindle extending laterally therefrom and having the inner end thereof received within said sleeve means; b. means arranged along said journal shaft spindle and adjacent the outer end thereof defining a pair of axially spaced inner bearing races; c. bearing means disposed along said inner races and outer race means disposed radially outwardly of said bearing means and retaining said bearing means radially therewithin, said outer race means comprising a bearing means retaining sleeve with axially spaced outer bearing races; d. wheel hub means comprising a central spindle receiving sleeve with hub flanges disposed at either end thereof and mounted radially outwardly of said bearing means and receiving said outer race means rigidly therewithin, and arranged to turn with said outer race means; e. a generally radially extending bore formed within said wheel supporting spindle receiving sleeve means and having releasable locking pin means extending therethrough, and recess means formed along said journal means for receiving said releasable locking pin means therewithin.
Claim 2
Dependent Claim
213 words
In an invalid supporting wheelchair having frame means, seat means supported upon said frame means, and wheel receiving spindle means mounted upon said frame means, said wheel receiving spindle means comprising: a. wheel supporting spindle receiving sleeve means rigidly mounted upon said frame means, a bearing assembly having a journal shaft spindle extending laterally therefrom and having the inner end thereof received within said sleeve means; b. means arranged along said journal shaft spindle and adjacent the outer end thereof defining a pair of axially spaced inner bearing races; c. bearing means disposed along said inner races and outer race means disposed radially outwardly of said bearing means and retaining said bearing means radially therewithin, said outer race means comprising a bearing means retaining sleeve with axially spaced outer bearing races; d. wheel hub means comprising a central spindle receiving sleeve with hub flanges disposed at either end thereof and mounted radially outwardly of said bearing means and receiving said outer race means rigidly therewithin, and arranged to turn with said outer race means; e. a generally radially extending bore formed within said wheel supporting spindle receiving sleeve means and having releasable locking pin means extending therethrough, and recess means formed along said journal means for receiving said releasable locking pin means therewithin.
Claim 3
Dependent Claim
36 words
The invalid supporting wheelchair as defined in claim 1 being particularly characterized in that said bearing means are spaced apart and disposed adjacent opposed axial ends of the central sleeve portion of said wheel hub means.
Claim 4
Dependent Claim
19 words
The invalid supporting wheelchair as defined in claim 1 being particularly characterized in that said bearing means are balls.
Claim 5
Dependent Claim
43 words
The invalid supporting wheelchair as defined in claim 2 being particularly characterized in that approximately one-half of the axial length of said journal shaft spindle is received within said central sleeve, with the other half being received within said wheel mounting sleeve means.
Claim 6
Dependent Claim
33 words
The invalid supporting wheelchair as defined in claim 1 being particularly characterized in that said bearing means are provided with radially extending seal elements adjacent the opposed ends of said outer race means.
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |