Patent US3575475A successfully refreshed from Google Patents.
US3575475A
Expired / Lapsed
US
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Flexure joint
Assignee: Kearfott Guidance and Navigation Corp
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Filing: 1969-06-03
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Granted: 1971-04-20
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Expires: 1989-06-03
Abstract
Abstract A flexure joint in which at least one pair of slots extend through the wall of a unitary hollow cylindrical member, the ends of one slot of each pair terminating a predetermined circumferential distance from the corresponding ends of the other slot of the same pair to form at least two flexure portions between the corresponding ends. Each flexure portion is formed by two flexure leaves, the longitudinal axes of which extend at an angle to each other.
Inventors
- 👤 Donald R Boerner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:56
CPC Classifications
F; F16; F16D; F16D3/00; F16D3/005; Y; Y10; Y10T; Y10T403/00; Y10T403/45; Y10T403/54; Y10T74/00; Y10T74/12; Y10T74/1293
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
A flexure joint comprising a unitary hollow cylindrical member having at least one pair of slots extending through the wall thereof, the ends of one slot of each pair terminating a predetermined circumferential distance from the corresponding ends of the other slot of the same pair to form at least two flexure portions between the corresponding ends, each flexure portion being formed of two flexure leaves, with the longitudinal axis of one flexure leaf of each flexure portion extending parallel to the axis of said cylindrical member, and the longitudinal axis of the other flexure leaf of each flexure portion extending perpendicular to the axis of said cylindrical member, each flexure leaf having two necked down portions connected in series, said flexure portions permitting relative flexing of at least one portion of said cylindrical member relative to at least one other portion thereof.
Claim 2
Dependent Claim
143 words
A flexure joint comprising a unitary hollow cylindrical member having at least one pair of slots extending through the wall thereof, the ends of one slot of each pair terminating a predetermined circumferential distance from the corresponding ends of the other slot of the same pair to form at least two flexure portions between the corresponding ends, each flexure portion being formed of two flexure leaves, with the longitudinal axis of one flexure leaf of each flexure portion extending parallel to the axis of said cylindrical member, and the longitudinal axis of the other flexure leaf of each flexure portion extending perpendicular to the axis of said cylindrical member, each flexure leaf having two necked down portions connected in series, said flexure portions permitting relative flexing of at least one portion of said cylindrical member relative to at least one other portion thereof.
Claim 3
Dependent Claim
26 words
The flexure joint of claim 1 wherein each of said necked down portions has two curved surfaces formed by drilling two bores through said cylindrical member.
Claim 4
Dependent Claim
99 words
A flexure joint comprising a unitary hollow cylindrical member formed into at least two gimbal portions and at least two flexure portions connecting two adjacent gimbal portions to permit relative flexing between said adjacent gimbal portions, each flexure portion being formed of two flexure leaves, with the longitudinal axis of one flexure leaf of each flexure portion extending parallel to the axis of said cylindrical member, and the longitudinal axis of the other flexure leaf of each flexure portion extending perpendicular to the axis of said cylindrical member, each flexure leaf having two necked down portions connected in series.
Claim 5
Dependent Claim
99 words
A flexure joint comprising a unitary hollow cylindrical member formed into at least two gimbal portions and at least two flexure portions connecting two adjacent gimbal portions to permit relative flexing between said adjacent gimbal portions, each flexure portion being formed of two flexure leaves, with the longitudinal axis of one flexure leaf of each flexure portion extending parallel to the axis of said cylindrical member, and the longitudinal axis of the other flexure leaf of each flexure portion extending perpendicular to the axis of said cylindrical member, each flexure leaf having two necked down portions connected in series.
Claim 6
Dependent Claim
26 words
The flexure joint of claim 3 wherein each of said necked down portions has two curved surfaces formed by drilling two bores through said cylindrical member.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |