Patent US3820464A successfully refreshed from Google Patents.
US3820464A
Expired / Lapsed
US
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Variable sized fragment explosive projectile
Assignee: United States Department of the Navy
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Filing: 1973-03-09
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Granted: 1974-06-28
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Expires: 1993-03-09
Abstract
Abstract A fragmentation projectile having a plurality of telescoping hollow concentric cylinders, each having a scored, failure, grid pattern, forming the shell of the projectile filled with an explosive. The outer cylinders may be manually rotated in the field prior to firing so as to align or misalign the failure grids of one cylinder to another to produce various fragment size and patterns. Mating serrations on the shell base and the cylinders lock the cylinders in the selected position.
Inventors
- 👤 L Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:17
CPC Classifications
F; F42; F42B; F42B12/00; F42B12/02; F42B12/20; F42B12/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A variable-sized fragment explosive projectile comprising: a base; a hollow inner cylinder having a failure grid pattern formed thereon affixed at one end to said base; a nose affixed to the other end of said cylinder; an explosive filling said cylinder between said base and said nose; at least one hollow rotatable cylinder having a failure grid pattern formed thereon concentric with said inner cylinder, whereby said rotatable cylinder may be rotated relative to said inner cylinder to place said failure grid patterns in alignment or misalignment; and means for locking said rotatable cylinder against relative movement to said inner cylinder.
Claim 2
Dependent Claim
101 words
A variable-sized fragment explosive projectile comprising: a base; a hollow inner cylinder having a failure grid pattern formed thereon affixed at one end to said base; a nose affixed to the other end of said cylinder; an explosive filling said cylinder between said base and said nose; at least one hollow rotatable cylinder having a failure grid pattern formed thereon concentric with said inner cylinder, whereby said rotatable cylinder may be rotated relative to said inner cylinder to place said failure grid patterns in alignment or misalignment; and means for locking said rotatable cylinder against relative movement to said inner cylinder.
Claim 3
Dependent Claim
41 words
The variable-sized fragment explosive projectile of claim 1, wherein said locking means comprises: a set of serrations on said base; and a serrated edge on the base end of said rotatable cylinder coacting with said set of serrations on said base.
Claim 4
Dependent Claim
37 words
The variable-sized fragment explosive projectile of claim 2, wherein said locking means further comprises: a set screw threadably engaged in said rotatable cylinder and contactable with said inner cylinder for maintaining said coacting serrations in releasable contact.
Claim 5
Dependent Claim
52 words
The variable-sized fragment explosive projectile of claim 3 further comprising: a second hollow rotatable cylinder having a failure grid pattern formed thereon concentric with said at least one rotatable cylinder; and means for locking said second rotatable cylinder against relative movement to said at least one rotatable cylinder and said inner cylinder.
Claim 6
Dependent Claim
24 words
The variable-sized fragment explosive projectile of claim 4 further comprising an opening in said second rotatable cylinder to provide access to said set screw.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |