Patent US4664013A successfully refreshed from Google Patents.
US4664013A
Expired / Lapsed
US
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Method and apparatus for setting the operating time of a projectile time fuze
Assignee: French-German Research Institute of Saint-Louis
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Filing: 1984-03-05
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Granted: 1987-05-12
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Expires: 2004-03-05
Abstract
Abstract Disclosed is a high-acceleration resistant, programmable, electronic time fuze and a method of an apparatus for the correction of the operating time of this time fuze by muzzle velocity measurement carried out inside the projectile or at the gun tube. The time fuze uses the muzzle velocity measured at firing to adjust its operating time. Thus, range dispersion of the event time is substantially reduced. The muzzle velocity is measured with a metal sensitive probe installed inside the projectile. When the probe passes annular grooves in the gun wall, an oscillator is detuned and generates pulses for determination of the projectile muzzle velocity. A bidirectional counter responds to the pulses in one direction, to other information in the other direction and sets off the fuze at a predetermined count such as zero.
Inventors
- 👤 Volker Wegner
- 👤 Gunter Schultze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:06
CPC Classifications
F; F42; F42C; F42C17/00; F42C17/04; F42C13/00; F42C13/02; F42C13/026; G; G01; G01P; G01P3/00; G01P3/64; G01P3/66; G01P3/665
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
71 words
Method setting the operating time of a time fuze in a projectile to be fired from a gun barrel, characterized by measuring the muzzle velocity of the projectile, and correcting the time setting on the basis of the muzzle velocity measured at a measuring station, the velocity being measured by measuring means in one of projectile and barrel relative to annular groove means on the other of said projectile and barrel.
Claim 2
Dependent Claim
71 words
Method setting the operating time of a time fuze in a projectile to be fired from a gun barrel, characterized by measuring the muzzle velocity of the projectile, and correcting the time setting on the basis of the muzzle velocity measured at a measuring station, the velocity being measured by measuring means in one of projectile and barrel relative to annular groove means on the other of said projectile and barrel.
Claim 3
Dependent Claim
25 words
A method as in claim 1, wherein said velocity is measured by said measuring means relative to a single annular groove in the gun barrel.
Claim 4
Dependent Claim
24 words
A method as in claim 1, wherein said velocity is measured by said measuring means relative to two annular grooves in the gun barrel.
Claim 5
Dependent Claim
20 words
Method as claimed in claim 1, characterized by the muzzle velocity being measured by the measuring means inside the projectile.
Claim 6
Dependent Claim
46 words
Method as claimed in claim 4, characterized by the muzzle velocity being measured by the measuring means with the use of an oscillator, the frequency of which is detuned by the projectile flying past the measuring station located inside or in front of the gun barrel.
Claim 7
Dependent Claim
33 words
Method as claimed in claims 1 or 4, characterized by the use of a bidirectional counter in combination with an adjustable frequency divider to measure the muzzle velocity and correct the time setting.
Claim 8
Dependent Claim
21 words
Method as claimed in claim 1, characterized by the muzzle velocity being measured by the measuring means at the gun barrel.
Claim 9
Dependent Claim
17 words
Method as claimed in claim 7, characterized by the correction being made by wireless radio frequency transmission.
Claim 10
Dependent Claim
17 words
Method as claimed in claim 7, characterized by the measured value being transmitted via optical relay connection.
Claim 11
Dependent Claim
78 words
Apparatus for setting a time fuze, in a projectile to be shot from a gun barrel, characterized by means for measuring the muzzle velocity of the projectile, a device for correcting the fuze time setting in accordance with the muzzle velocity measured, said measuring means being located on one of said projectile and gun barrel, and annular groove means on the other of said projectile and gun barrel relative to which said measuring means measures the muzzle velocity.
Claim 12
Dependent Claim
78 words
Apparatus for setting a time fuze, in a projectile to be shot from a gun barrel, characterized by means for measuring the muzzle velocity of the projectile, a device for correcting the fuze time setting in accordance with the muzzle velocity measured, said measuring means being located on one of said projectile and gun barrel, and annular groove means on the other of said projectile and gun barrel relative to which said measuring means measures the muzzle velocity.
Claim 13
Dependent Claim
16 words
An apparatus as in claim 10, wherein the annular groove means is a single annular groove.
Claim 14
Dependent Claim
15 words
A apparatus as in claim 10, wherein the annular groove means is two annular grooves.
Claim 15
Dependent Claim
20 words
Apparatus as claimed in claim 10, characterized by the means for measuring the muzzle velocity being located inside the projectile.
Claim 16
Dependent Claim
30 words
Apparatus as claimed in claim 10, characterized by the measuring means including an oscillator located so that its frequency is detuned significantly by the projectile traveling along the gun barrel.
Claim 17
Dependent Claim
25 words
Apparatus as claimed in claim 10, characterized by the means for measuring the muzzle velocity (MV) being located at least partially at the gun barrel.
Claim 18
Dependent Claim
30 words
Apparatus as claimed in claim 15, characterized by the measuring means including an oscillator located so that its frequency is detuned significantly by the projectile traveling along the gun barrel.
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |