Patent US4387891A successfully refreshed from Google Patents.
US4387891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walker
Assignee: Individual
•
Filing: 1980-12-02
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Granted: 1983-06-14
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Expires: 2000-12-02
Abstract
Abstract A walker including a frame, the forward portion of which is provided with rotary members at its lower end for advancing the walking aid. The rotary members comprise 2 spoked wheels fixed to the ends of and rotatable with an axle, the spokes of the rotary members being out of phase to advance the walking aid in a step-by-step fashion in response to the shifting of weight by the patient from one side of the frame to the other.
Inventors
- 👤 E. Stanley Knochel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:24
CPC Classifications
A; A61; A61H; A61H3/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
181 words
A walker comprising (a) an upstanding frame including right and left hand support portions (b) each of said support portions comprising front and rear ground-engaging members for stabilizing the walker (c) bearing means associated with the lower part of each of said right and left hand support portions (d) an axle rotatably carried by said bearing means spanning said support portions, and (e) a hub fixedly secured to each end of said axle (f) said front ground-engaging members including a plurality of equally spaced spokes extending radially outwardly from said hub (g) the spokes on one hub being substantially one-half step out of phase with the spokes on the other hub, whereby, when one of the spokes of said one hub is substantially perpendicular to, and in engagement with the ground, two of the spokes of said other hub are angularly disposed to, and in engagement with, the ground so that the walker can be stably advanced in stepwise increments in response to downward forces alternately applied by the patient to the right and left hand support portions of the frame.
Claim 2
Dependent Claim
181 words
A walker comprising (a) an upstanding frame including right and left hand support portions (b) each of said support portions comprising front and rear ground-engaging members for stabilizing the walker (c) bearing means associated with the lower part of each of said right and left hand support portions (d) an axle rotatably carried by said bearing means spanning said support portions, and (e) a hub fixedly secured to each end of said axle (f) said front ground-engaging members including a plurality of equally spaced spokes extending radially outwardly from said hub (g) the spokes on one hub being substantially one-half step out of phase with the spokes on the other hub, whereby, when one of the spokes of said one hub is substantially perpendicular to, and in engagement with the ground, two of the spokes of said other hub are angularly disposed to, and in engagement with, the ground so that the walker can be stably advanced in stepwise increments in response to downward forces alternately applied by the patient to the right and left hand support portions of the frame.
Claim 3
Dependent Claim
22 words
The walker of claim 1, with the addition of (a) tips of non-skid material fixed to the outer ends of said spokes.
Claim 4
Dependent Claim
22 words
The walker of claim 1, wherein (a) said front ground-engaging members further include stabilizing feet on the lower end of said frame.
Claim 5
Dependent Claim
23 words
The walker of claim 1, with the addition of (a) adjustable and removable extensions engaged with said frame to vary the height thereof.
Claim 6
Dependent Claim
30 words
The walker of claim 4, wherein (a) said bearing means are fixed to said extensions, whereby said extensions, axle, hubs and spokes may be removed and replaced as a unit.
Claim 7
Dependent Claim
89 words
The walker of claim 1, wherein (a) said frame includes a rear portion comprising a forward transverse horizontal section, the ends of which extend rearwardly to provide opposed horizontal side bars, (b) rear legs extending downwardly from the aft end of said side bars (c) said frame further including a front portion of inverted U-shape comprising a horizontal section, the ends of which extend downwardly to provide front legs, and (d) means for securing the horizontal section of said rear portion to the horizontal section of said front portion.
Claim 8
Dependent Claim
28 words
The walker of claim 6, with the addition of (a) adjustable and removable extensions engaged with said front and rear legs to vary the height of said frame.
Claim 9
Dependent Claim
30 words
The walker of claim 7, wherein (a) said bearing means are fixed to said extensions, whereby said extensions, axle, hubs and spokes may be removed and replaced as a unit.
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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) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |