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US3690652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foldable invalid walker convertible from fixed to swingable walker
Assignee: Parker Machine Co Inc
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Filing: 1971-06-07
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Granted: 1972-09-12
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Expires: 1991-06-07
Abstract
Abstract A foldable invalid walker is provided with a pair of locking keys each of which is mounted within a leg of the walker for movement into either a narrow slot for use of the walker as a fixed walker, or into a wide slot for use of the walker as a swingable striding walker. When the keys are positioned in their respective narrow slots, the associated legs are held against relative movement with respect to the rest of the walker. When the keys are positioned in their respective wide slots, the associated legs are pivotally mounted to the rest of the walker, thus converting the walker to a swingable walker. The walker can further be folded for storage.
Inventors
- 👤 Joseph C Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:46
CPC Classifications
A; A61; A61H; A61H3/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A foldable invalid walker usable as fixed walker and as a swingable walker, said walker comprising a pair of substantially U-shaped leg members, a cross-brace joining said leg members, at least one locking means having key and slot elements, one of said elements on at least one of said leg members and the other of said elements on said cross-brace, said slot elements including a narrow slot to snugly engage said key to lock said cross-brace and the associated leg member against relative movement to provide a fixed walker and a wide slot to provide for relative pivotal movement between said cross-brace and the associated leg member to permit limited movement of said key to provide a swingable walker.
Claim 2
Dependent Claim
119 words
A foldable invalid walker usable as fixed walker and as a swingable walker, said walker comprising a pair of substantially U-shaped leg members, a cross-brace joining said leg members, at least one locking means having key and slot elements, one of said elements on at least one of said leg members and the other of said elements on said cross-brace, said slot elements including a narrow slot to snugly engage said key to lock said cross-brace and the associated leg member against relative movement to provide a fixed walker and a wide slot to provide for relative pivotal movement between said cross-brace and the associated leg member to permit limited movement of said key to provide a swingable walker.
Claim 3
Dependent Claim
28 words
The walker of claim 1 wherein said cross-brace includes at least one bearing sleeve at each end, and said leg members are rotatably mounted in said bearing sleeves.
Claim 4
Dependent Claim
34 words
The walker of claim 2 wherein one of said keys is mounted in each of said pair of leg members, and each of said bearing sleeves contains said narrow slot and said wide slot.
Claim 5
Dependent Claim
32 words
The walker of claim 3 wherein each of said keys is mounted within an opening in said leg and selectively urged into engagement with one of said slots in said bearing sleeves.
Claim 6
Dependent Claim
21 words
The walker of claim 4 wherein each of said keys is restrained from loss by a collar on said bearing sleeves.
Claim 7
Dependent Claim
27 words
The walker of claim 5 wherein each of said keys includes a push button extending beyond said bearing sleeves for selectively disengaging said keys from said slots.
Claim 8
Dependent Claim
29 words
The walker of claim 6 wherein each of said wide slots is so dimensioned as to limit the rotation of said legs to provide a stride limiting swingable walker.
Claim 9
Dependent Claim
32 words
The walker of claim 7 wherein said cross-brace includes a pair of V-shaped members joined at their mid-points, said V-shaped members being terminated at both ends by one of said bearing sleeves.
Claim 10
Dependent Claim
26 words
The walker of claim 8 wherein said cross-brace is retained on said leg members by a split sleeve fixed thereto and positioned between said bearing sleeves.
Claim 11
Dependent Claim
20 words
The walker of claim 9 wherein said push button of said key extends through the split in said split sleeve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |