Patent US3730198A successfully refreshed from Google Patents.
US3730198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible crutch
Assignee: Unlimited Development Inc
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Filing: 1972-03-01
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Granted: 1973-05-01
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Expires: 1992-03-01
Abstract
Abstract A collapsible crutch apparatus having a telescoping frame and a telescoping leg, both being adapted to telescope the crutch into a collapsed position for locking in a collapsed position for storage in a container. The frame and the leg can be telescoped from a collapsed position to a desired length and locked in position with a quick connecting lock. The dual collapsing system allows the crutch to be transported and stored in a relatively small storage container and then to be quickly expanded for use.
Inventors
- 👤 T Johnston
- 👤 J Pippin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:52
CPC Classifications
A; A61; A61H; A61H3/00; A61H3/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
137 words
A collapsible crutch apparatus comprising in combination: a. telescoping frame having a pair of elongated telescoping tubes connected together at one end by an armpit rest member and at the other end thereof by a leg supporting member; b. a handgripping member connected between said elongated telescoping tubes between the ends thereof and having an opening therein; c. a leg member passing through said leg supporting member and being supported by said leg supporting member; d. leg locking means for locking said leg to said leg supporting means in said crutch apparatus expanded position and for locking said crutch apparatus to said armpit rest in its collapsed position; and e. frame locking means for locking said pair of elongated telescoping tubes in their expanded position and for releasing said elongated telescoping tubes for collapsing said crutch apparatus.
Claim 2
Dependent Claim
137 words
A collapsible crutch apparatus comprising in combination: a. telescoping frame having a pair of elongated telescoping tubes connected together at one end by an armpit rest member and at the other end thereof by a leg supporting member; b. a handgripping member connected between said elongated telescoping tubes between the ends thereof and having an opening therein; c. a leg member passing through said leg supporting member and being supported by said leg supporting member; d. leg locking means for locking said leg to said leg supporting means in said crutch apparatus expanded position and for locking said crutch apparatus to said armpit rest in its collapsed position; and e. frame locking means for locking said pair of elongated telescoping tubes in their expanded position and for releasing said elongated telescoping tubes for collapsing said crutch apparatus.
Claim 3
Dependent Claim
33 words
The apparatus in accordance with claim 1 in which said leg supporting member includes a sleeve attached thereto for attaching said leg member to for supporting said leg when said leg passes therethrough.
Claim 4
Dependent Claim
30 words
The apparatus in accordance with claim 2 in which said armpit rest has a sleeve attached thereto for receiving said leg member for locking said leg in its collapsed position.
Claim 5
Dependent Claim
40 words
The apparatus in accordance with claim 3, in which said armpit rest has an opening for said leg member to pass therethrough for locking said leg member in said armpit rest sleeve when said crutch is in its collapsed position.
Claim 6
Dependent Claim
37 words
The apparatus in accordance with claim 1 in which said handgripping member is locked to said elongated telescoping tubes by tightening said handgripping member into frictional contact with a frictional engaging surface on said elongated telescoping tubes.
Claim 7
Dependent Claim
45 words
The apparatus in accordance with claim 5 in which said leg locking means includes apertures in said leg support sleeve for engaging a spring biased latch member located at said leg member for holding said leg member at any one of said plurality of apertures.
Claim 8
Dependent Claim
36 words
The apparatus in accordance with claim 6 in which said armpit rest sleeve has a plurality of apertures therein for engaging said latch member on said leg member for holding said crutch in its collapsed position;
Claim 9
Dependent Claim
61 words
The apparatus in accordance with claim 7 in which each pair of elongated telescoping tubes has an outer tube having a plurality of apertures therein and an inner tube for telescoping in said outer tube and having a spring biased latch member adapted to be received by said aperture and said outer member for locking said crutch in its expanded position.
References Cited (Backward Citations)
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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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |