Patent US3976010A successfully refreshed from Google Patents.
US3976010A
Expired / Lapsed
US
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Spin compensated liner for shaped charge ammunition and method of making same
Assignee: Whittaker Corp
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Filing: 1973-04-16
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Granted: 1976-08-24
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Expires: 1993-04-16
Abstract
Abstract A shaped charge liner is made by forming a pair of hollow conical sub-liners, without any uncontrolled residual tangential shear stress (e.g. by a deep drawing method) so that they mate together to form a single conical liner. One sub-liner is inserted in the other and then one pair of subliner ends are locked together. Thereafter, the sub-liners are counter-rotated about their attachment point and locked together at their other pair of ends to retain the counter-rotation. This counter rotation generates opposite residual tangential shear stresses in the two sub-liners which may or may not be equal to each other.
Inventors
- 👤 Louis Zernow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:41
CPC Classifications
F; F42; F42B; F42B1/00; F42B1/02; F42B1/036; F42B12/00; F42B12/02; F42B12/04; F42B12/10; F42B12/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49936
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
A method of forming a spin compensating, shaped-charge liner, comprising the steps of: forming a pair of hollow, conical sub-liners sized to coaxially mate together; inserting one said sub-liner within the other said sub-liner to form a hollow, conical, shaped-charge liner having a longitudinal axis; fixedly interconnecting said sub-liners adjacent one pair of ends thereof to lock said one pair of ends against rotation relative to each other; rotationally twisting said sub-liners in opposite directions about said longitudinal axis about said one pair of ends to provide each said sub-liner with a tangential shear stress of opposite sign and direction to that in the other said sub-liner; fixedly interconnecting said sub-liners adjacent their other pair of ends to substantially preserve said opposite twisting to thereby provide said shaped-charge liner with residual tangential shear stress of opposite sign and direction in each said sub-liner.
Claim 2
Independent Claim
143 words
A method of forming a spin compensating, shaped-charge liner, comprising the steps of: forming a pair of hollow, conical sub-liners sized to coaxially mate together; inserting one said sub-liner within the other said sub-liner to form a hollow, conical, shaped-charge liner having a longitudinal axis; fixedly interconnecting said sub-liners adjacent one pair of ends thereof to lock said one pair of ends against rotation relative to each other; rotationally twisting said sub-liners in opposite directions about said longitudinal axis about said one pair of ends to provide each said sub-liner with a tangential shear stress of opposite sign and direction to that in the other said sub-liner; fixedly interconnecting said sub-liners adjacent their other pair of ends to substantially preserve said opposite twisting to thereby provide said shaped-charge liner with residual tangential shear stress of opposite sign and direction in each said sub-liner.
Claim 3
Dependent Claim
18 words
The method of claim 1 in which said sub-liners are formed with substantially no residual tangential shear stress.
Claim 4
Dependent Claim
35 words
The method of claim 1 in which said sub-liners are formed with intrinsic spin compensation properties of opposite direction and in which said rotational twisting increases said intrinsic spin compensation properties in each said sub-liner.
Claim 5
Dependent Claim
21 words
The method of claim 1 in which each said sub-liner is rotationally twisted up to its tangential shear yield strength limit.
Claim 6
Dependent Claim
106 words
The method of claim 1 in which said sub-liners are fixedly interconnected adjacent one pair of ends thereof and in which: said sub-liners are oppositely rotationally twisted to produce a substantially maximum allowable tangential shear stress in an annular volume increment of each said sub-liner adjacent said fixedly interconnected ends; said sub-liners are further fixedly interconnected in the region of said annular volume increment to lock in said substantially maximum shear stresses of opposite sign and direction; and sequentially repeating the twisting and locking steps on adjacent volume increments progressively to said other pair of ends to substantially maximize the residual shear stress in said liner.
Claim 7
Dependent Claim
60 words
The method of claim 1 in which the outer and inner surfaces of the smaller and larger of said sub-liners, respectively, are roughened, said sub-liners being initially sized for slip-fit mating relation, said method further including varying the relative transverse sectional size of said sub-liners substantially concurrently with twisting said sub-liners to produce a locking fit between said roughened surfaces.
Claim 8
Dependent Claim
55 words
A spin compensating, shaped-charge liner comprising: a pair of hollow, conical sub-liners sized to coaxially mate together to form said shaped-charge liner, said sub-liners being locked together at opposite ends thereof and being oppositely twisted therebetween to provide said shaped-charge liner with residual tangential shear stresses of opposite sign and direction in each said sub-liner.
Claim 9
Dependent Claim
55 words
A spin compensating, shaped-charge liner comprising: a pair of hollow, conical sub-liners sized to coaxially mate together to form said shaped-charge liner, said sub-liners being locked together at opposite ends thereof and being oppositely twisted therebetween to provide said shaped-charge liner with residual tangential shear stresses of opposite sign and direction in each said sub-liner.
Claim 10
Dependent Claim
28 words
The liner of claim 7 in which substantially all of the residual tangential shear stresses in each said sub-liner is due to said opposite twisting of said sub-liners.
Claim 11
Dependent Claim
42 words
The liner of claim 8 in which each said sub-liner has intrinsic spin compensation characteristics of opposite direction to those in the other said sub-liner which increase the spin compensation effect resulting from said residual tangential shear stresses in each said sub-liner.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |