Patent US3893557A successfully refreshed from Google Patents.
US3893557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic strikedown system for projectiles
Assignee: United States Department of the Navy
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Filing: 1974-03-29
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Granted: 1975-07-08
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Expires: 1994-03-29
Abstract
Abstract A system for moving a projectile from one deck level to a lower deck level having a pneumatic tube slightly larger in diameter than the diameter of the projectile to be lowered. A resilient boot is temporarily attached to one end of a projectile to be lowered and the resilient boot is engageable with the inner wall of the pneumatic tube to provide an air seal. A plurality of orifices are provided in the pneumatic tube to regulate the rate of fall of a projectile. An unloading device is provided at the bottom of the tube to facilitate removal of a projectile.
Inventors
- 👤 J Luis Frenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:00
CPC Classifications
B; B65; B65G; B65G11/00; B65G11/20; B65G11/203
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
A handling device for a projectile having a temporarily mounted resilient boot on one end comprising, a vertically oriented tube having an inner diameter slightly larger than the diameter of said projectile and slightly smaller than the diameter of said resilient boot whereby said resilient boot provides an air seal when said projectile is falling through said tube, at least one orifice in the side of said tube near a lower end for allowing air to escape during descent of said projectile through said tube thereby regulating the speed of descent of said projectile, a drum rotatably positioned at the lower end of said tube providing a closure for the lower end of said tube, said drum being rotatable about a horizontally oriented shaft offset a first fixed distance from the central axis of said vertically oriented tube, and at least three cavities in said drum each having its central axis offset a fixed distance equal to said first fixed distance whereby said central axis of each said cavity is alignable with the central axis of said vertically oriented tube and whereby loading of a projectile through said vertically oriented tube into one of said cavities causes rotation of said drum.
Claim 2
Dependent Claim
201 words
A handling device for a projectile having a temporarily mounted resilient boot on one end comprising, a vertically oriented tube having an inner diameter slightly larger than the diameter of said projectile and slightly smaller than the diameter of said resilient boot whereby said resilient boot provides an air seal when said projectile is falling through said tube, at least one orifice in the side of said tube near a lower end for allowing air to escape during descent of said projectile through said tube thereby regulating the speed of descent of said projectile, a drum rotatably positioned at the lower end of said tube providing a closure for the lower end of said tube, said drum being rotatable about a horizontally oriented shaft offset a first fixed distance from the central axis of said vertically oriented tube, and at least three cavities in said drum each having its central axis offset a fixed distance equal to said first fixed distance whereby said central axis of each said cavity is alignable with the central axis of said vertically oriented tube and whereby loading of a projectile through said vertically oriented tube into one of said cavities causes rotation of said drum.
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |