Patent US3568957A successfully refreshed from Google Patents.
US3568957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Long structural column support
Assignee: McDonnell Douglas Corp
•
Filing: 1968-11-13
•
Granted: 1971-03-09
•
Expires: 1988-11-13
Abstract
Abstract A structural column support having two external superimposed threads of different lead whereby a load carrying nut moves along the column at a higher rate than the screw support sleeve which follows the threads of lesser lead. The sleeve thus divides a single long column into two shorter columns which may be of a smaller diameter and lesser weight than the longer unsupported column, while resisting the same bending and buckling compressive forces.
Inventors
- 👤 Lorin A Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:25
CPC Classifications
B; B64; B64C; B64C9/00; B64C9/14; B64C9/16; Y; Y02; Y02T; Y02T50/00; Y02T50/40; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702; Y10T74/19721
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
A structural column support comprising: a rotatable column having a support sleeve and a load bearing nut nonrotatably mounted for simultaneous differential longitudinal movement therealong; said column having one end thereof mounted on aircraft wing structure; said nut being affixed to a movable aircraft flap for actuation thereof; said nut advancing along said column a predetermined increment distance per column revolution; and said support sleeve being threadedly engageable with said column for advancement along said column in the same direction but less tham said predetermined increment distance per column revolution.
Claim 2
Dependent Claim
90 words
A structural column support comprising: a rotatable column having a support sleeve and a load bearing nut nonrotatably mounted for simultaneous differential longitudinal movement therealong; said column having one end thereof mounted on aircraft wing structure; said nut being affixed to a movable aircraft flap for actuation thereof; said nut advancing along said column a predetermined increment distance per column revolution; and said support sleeve being threadedly engageable with said column for advancement along said column in the same direction but less tham said predetermined increment distance per column revolution.
Claim 3
Dependent Claim
57 words
A structural column support as set forth in claim 1, wherein said column has a first set of external threads thereon threadedly engageable with said load carrying nut for longitudinal advancement thereof, said column having a second set of external threads superimposed over said first set of threads to provide longitudinal movement of said column support sleeve.
Claim 4
Dependent Claim
37 words
A structural column support as set forth in claim 2, wherein said first set of threads have deeper grooves for carrying said nut, said second set of threads having grooves of less depth for carrying said sleeve.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |