Patent US5974427A successfully refreshed from Google Patents.
US4461471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walker
Assignee: WHITECAP ENTERPRISES Corp A MA CORP
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Filing: 1982-05-03
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Granted: 1984-07-24
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Expires: 2002-05-03
Abstract
Abstract A walker comprising spaced, parallel frame members defining spaced, parallel handrails supported by pairs of legs with wheels at the lower ends of the legs, manually-operable linkage operable to mobilize and demobilize the wheels at the lower end of at least two of the legs, characterized in that the frame members are interconnected by linkage which enables folding the frame members into overlapping parallel relation to each other.
Inventors
- 👤 Carl H. Brastow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:33
CPC Classifications
A; A61; A61H; A61H3/00; A61H3/04; A61H2003/046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
282 words
A walker comprising spaced, parallel side frames, each side frame embodying a handrail and being provided with wheels for mobilization, a rigid crossbar having a straight intermediate portion throughout the major portion of its length and bent end portions, the ends of which are pivotally connected to the frame members, said crossbar defining a nest and said frame members being foldable into overlapping, generally parallel relation to each other and to the straight portion of the crossbar within the nest defined by the crossbar, a spreader bar having an intermediate portion throughout the major portion of its length comprised of straight telescoping sections and releasable locking means for holding the telescoping section distended to, in turn, hold the frame members in parallel relation, said spreader bar having end portions bent at angles such that when the spreader bar is distended, said bent end portions are parallel to the frame members, lever control means mounted to each of said frame members for braking and releasing the wheels, and a transmission member positioned transversely of the frame members with its ends operably connected to the lever control means operable to transmit actuation of the lever control means at one side to the lever control means at the other side and vice verse, said transmission member comprising articulated parts which permit folding of said frames into parallel relation without disabling the lever control means and including a rigid bar having a bent end and an articulated end wherein the bent end is pivotally connected to one of the lever control means and articulated means is pivotally connected at one end to the bar and pivotally connected at the other end to the lever control means.
Claim 2
Dependent Claim
282 words
A walker comprising spaced, parallel side frames, each side frame embodying a handrail and being provided with wheels for mobilization, a rigid crossbar having a straight intermediate portion throughout the major portion of its length and bent end portions, the ends of which are pivotally connected to the frame members, said crossbar defining a nest and said frame members being foldable into overlapping, generally parallel relation to each other and to the straight portion of the crossbar within the nest defined by the crossbar, a spreader bar having an intermediate portion throughout the major portion of its length comprised of straight telescoping sections and releasable locking means for holding the telescoping section distended to, in turn, hold the frame members in parallel relation, said spreader bar having end portions bent at angles such that when the spreader bar is distended, said bent end portions are parallel to the frame members, lever control means mounted to each of said frame members for braking and releasing the wheels, and a transmission member positioned transversely of the frame members with its ends operably connected to the lever control means operable to transmit actuation of the lever control means at one side to the lever control means at the other side and vice verse, said transmission member comprising articulated parts which permit folding of said frames into parallel relation without disabling the lever control means and including a rigid bar having a bent end and an articulated end wherein the bent end is pivotally connected to one of the lever control means and articulated means is pivotally connected at one end to the bar and pivotally connected at the other end to the lever control means.
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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |