US3901223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knee joints for leg irons
Assignee: JE Hanger and Co Ltd
•
Filing: 1974-05-28
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Granted: 1975-08-26
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Expires: 1994-05-28
Abstract
Abstract The invention provides a knee joint for a leg iron comprising a longer forward link and a shorter rearward link pivoted between lugs at the base of a thigh iron and lugs at the head of a shin iron. A spur on the forward link contacts an abutment formed on the shin iron both at full extension and full flexure to prevent hyperextension and hyperflexion.
Inventors
- 👤 Denis Ronald William May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:11
CPC Classifications
A; A61; A61F; A61F5/00; A61F5/01; A61F5/0102; A61F5/0123; A61F2/00; A61F2/50; A61F2/60; A61F2/64; A61F2/642; A61F2/644; A61F2005/0132; A61F2005/0146; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32951
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
100 words
A knee joint for a leg iron comprising a shin iron having a head carrying a forward pivot and a rearward pivot, a thigh iron having a base carrying a forward pivot and a rearward pivot, a swinging link between the rearward pivots and a longer swinging link between the forward pivots, a single fixed abutment on said shin iron, and means rearwardly extending from said longer link for cooperative engagement with said single fixed abutment at full extension and at full flexion of the joint so as to limit the degree of movement of said joint in both directions.
Claim 2
Dependent Claim
100 words
A knee joint for a leg iron comprising a shin iron having a head carrying a forward pivot and a rearward pivot, a thigh iron having a base carrying a forward pivot and a rearward pivot, a swinging link between the rearward pivots and a longer swinging link between the forward pivots, a single fixed abutment on said shin iron, and means rearwardly extending from said longer link for cooperative engagement with said single fixed abutment at full extension and at full flexion of the joint so as to limit the degree of movement of said joint in both directions.
Claim 3
Dependent Claim
35 words
A knee joint for a leg iron according to claim 1, in which the abutment on the shin iron is an inclined face formed by reducing the width of the head of the shin iron.
References Cited (Backward Citations)
US2208275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |