US4787405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convertible crutch
Assignee: Individual
•
Filing: 1986-07-21
•
Granted: 1988-11-29
•
Expires: 2006-07-21
Abstract
Abstract A convertible crutch is disclosed having a generally L-shaped upper support section to a generally S-shaped central support section connected, in turn, to a substantially straight lower support portion. The connection mechanism between the upper support section and the central support section can be utilized to connect the upper support section to the lower support section and convert the crutch to a cane when the central support section is removed.
Inventors
- 👤 Daniel E. Karwoski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:10
CPC Classifications
A; A61; A61H; A61H3/00; A61H3/02; A45; A45B; A45B3/00; A45B9/00; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32467; Y10T403/32475; Y10T403/32483
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
312 words
A crutch comprising an upper support section, a central support section, and a lower support section having a longitudinal axis, first means cooperating between the upper and central support sections for connecting the upper support section to the central support section and second means cooperating between the central and lower support sections for connecting the central support section to the lower support section, said central support section having a hand gripping portion intermediate the first and second connecting means, said hand gripping portion having a midpoint offset with respect to the longitudinal axis of the lower support section in a forwardly direction whereby a forward thrusting moment is created by a force applied downwardly at the midpoint of the hand gripping portion, said upper support section comprising an arm support portion spaced above said hand gripping portion, said arm support portion having a midpoint offset with respect to the longitudinal axis of the lower support section in a rearwardly direction whereby a rearward thrusting moment is created by a force applied downwardly at the midpoint of the arm support section, said upper support section being generally L-shaped, said first connecting means comprising a telescopic joint between said upper and central support sections and detent means engageable in a selected one of a plurality of apertures in one of said upper and central support sections for adjusting the distance between the arm support portion and the hand gripping portion, said first connecting means further comprising a locking collar means for frictionally locking the telescopic joint between said upper support section and said central support section, said second connecting means comprising a sleeve threadably connecting the central support section with the lower support section, whereby said upper support section is connectable to said lower support section whereby said crutch is adapted to be converted into a cane by removal of said central support section.
Claim 2
Dependent Claim
312 words
A crutch comprising an upper support section, a central support section, and a lower support section having a longitudinal axis, first means cooperating between the upper and central support sections for connecting the upper support section to the central support section and second means cooperating between the central and lower support sections for connecting the central support section to the lower support section, said central support section having a hand gripping portion intermediate the first and second connecting means, said hand gripping portion having a midpoint offset with respect to the longitudinal axis of the lower support section in a forwardly direction whereby a forward thrusting moment is created by a force applied downwardly at the midpoint of the hand gripping portion, said upper support section comprising an arm support portion spaced above said hand gripping portion, said arm support portion having a midpoint offset with respect to the longitudinal axis of the lower support section in a rearwardly direction whereby a rearward thrusting moment is created by a force applied downwardly at the midpoint of the arm support section, said upper support section being generally L-shaped, said first connecting means comprising a telescopic joint between said upper and central support sections and detent means engageable in a selected one of a plurality of apertures in one of said upper and central support sections for adjusting the distance between the arm support portion and the hand gripping portion, said first connecting means further comprising a locking collar means for frictionally locking the telescopic joint between said upper support section and said central support section, said second connecting means comprising a sleeve threadably connecting the central support section with the lower support section, whereby said upper support section is connectable to said lower support section whereby said crutch is adapted to be converted into a cane by removal of said central support section.
Claim 3
Dependent Claim
18 words
The crutch of claim 1, including removable sponge rubber sleeves covering said arm support and hand gripping portions.
Claim 4
Dependent Claim
60 words
The crutch of claim 1, wherein said central support section is a generally S-shaped, one-piece, unarticulated tubular member comprising said hand gripping portion, an upper vertical portion bent upwardly a substantially a right angle from one end of the hand gripping portion and a lower inclined portion bent downwardly at an acute angle with respect to the hand gripping portion.
Claim 5
Dependent Claim
86 words
The crutch of claim 1, wherein said lower support section comprises upper and lower tubular members and third means cooperating between the tubular members for connecting the tubular members together, said third connecting means comprising a telescopic joint between said upper and lower tubular members and detent means engageable in a selected one of a plurality of apertures in one of said tubular members for adjusting the length of the lower support section whereby the distance between the ground and said hand gripping portion is adjusted.
Claim 6
Dependent Claim
34 words
The crutch of claim 4, wherein said third connecting means further comprises a locking collar means for frictionally locking the telescopic joint between the upper and lower tubular members of the lower support section.
Claim 7
Dependent Claim
26 words
The crutch of claim 1, including a spike connected to the free end of the lower support section and a removable rubber tip covering said spike.
Claim 8
Dependent Claim
21 words
The crutch of claim 1, wherein said arm support portion has a bend intermediately thereof so as to be concavely curved.
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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) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |