US4922940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Invalid walker
Assignee: Individual
•
Filing: 1989-07-31
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Granted: 1990-05-08
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Expires: 2009-07-31
Abstract
Abstract An improved walking assistance device which is also specifically adapted for traversing stairs comprises a rigid intertwined open framework supported by a front and rear pair of legs which permit the device to span multi steps in a stairway. The open framework includes forwardly extending arm rails parallel to the slope of the stairs. Other arm rails support a sling seat for the user person. The device is fitted with appropriate hinges for folding reduction in overall size for more convenient portability.
Inventors
- 👤 Michael M. Lewy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:33
CPC Classifications
A; A61; A61H; A61H3/00; A61H2003/001; A61H2201/00; A61H2201/16; A61H2201/1602; A61H2201/1628; A61H2201/1633
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
223 words
A walking assistance device particularly adapted to assisting a user in ascending or descending a stairway having a plurality of steps, said device comprising in combination: (a) a light weight easily portable open end encircling framework; (b) said framework having a pair of front leg supports spaced by a first lateral distance and a pair of rear leg supports spaced by a second lateral distance; (c) a part of said frame defining a first set of parallel spaced apart side handrails for the user of said device to grasp when said device is on a substantially flat surface; (d) a further part of said frame projecting in the open end direction of said framework such that a second set of parallel spaced apart handrails is provided, said second set of handrails being vertically lower than said first set of handrails, said second set of handrails being sized and located for the user of said device to grasp when ascending or descending the stairway; (e) said pair of front legs being spaced from said pair of rear legs such that said device spans at least three steps when used to ascend or descend the stairway; and (f) said open end framework provides continuous support by encircling the user of said device on three sides when in use on a flat surface or a stairway.
Claim 2
Dependent Claim
223 words
A walking assistance device particularly adapted to assisting a user in ascending or descending a stairway having a plurality of steps, said device comprising in combination: (a) a light weight easily portable open end encircling framework; (b) said framework having a pair of front leg supports spaced by a first lateral distance and a pair of rear leg supports spaced by a second lateral distance; (c) a part of said frame defining a first set of parallel spaced apart side handrails for the user of said device to grasp when said device is on a substantially flat surface; (d) a further part of said frame projecting in the open end direction of said framework such that a second set of parallel spaced apart handrails is provided, said second set of handrails being vertically lower than said first set of handrails, said second set of handrails being sized and located for the user of said device to grasp when ascending or descending the stairway; (e) said pair of front legs being spaced from said pair of rear legs such that said device spans at least three steps when used to ascend or descend the stairway; and (f) said open end framework provides continuous support by encircling the user of said device on three sides when in use on a flat surface or a stairway.
Claim 3
Dependent Claim
33 words
The invention as recited in claim 1 wherein folding means are incorporated in said frame to fold said frame into a folded structure having markedly reduced dimensions as compared to its unfolded dimensions.
Claim 4
Dependent Claim
34 words
The invention as recited in claim 1 wherein a flexible material sling seat 26 is releasably secured to said side hand rails to be suspended therefrom and seat the user of said device therein.
Claim 5
Dependent Claim
47 words
The invention as recited in claim 1 wherein said first lateral distance and said second lateral distance are approximately equal and the at least three step span distance between said front and rear leg supports is greater than the lateral distance between said pairs of leg supports.
Claim 6
Dependent Claim
41 words
The invention as recited in claim 4 wherein said at least three step span difference between said front and rear leg supports is 1.5 to 1.7 times greater than the lateral distance between said pairs of front and back leg supports.
Claim 7
Dependent Claim
26 words
The invention as recited in claim 1 wherein said device is constructed to span at least four steps when used to ascend or descend the stairway.
Claim 8
Dependent Claim
96 words
The invention as recited in claim 1 wherein said open end framework includes a transverse section which connects a first side of the framework having one of said front leg supports and one of said rear leg supports with a second side of said framework, said second side having the other of said front leg supports and the other of said rear legs supports, and wherein the device further includes pivot means in the transverse section between said first and second side frame members to pivot said side frames into planar abutting relationship to each other.
Claim 9
Dependent Claim
22 words
The invention as recited in claim 7 wherein said pivot means includes a user retractable lock means to actuate said pivot 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) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |