Patent US3742857A successfully refreshed from Google Patents.
US3742857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuzing system for stabilized anti-tank ammunition
Assignee: Individual
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Filing: 1971-04-05
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Granted: 1973-07-03
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Expires: 1991-04-05
Abstract
Abstract In combination a spin arming fuze which completes its arming after the setback force thereon terminates and an energy supply for detonating the fuze which is derived from a pressure transducer that is activated by the application and release of the setback force. Effectively, the piezoelectric crystal is loaded during setback and the resulting energy charge is bled off through a shorting bar responding to the setback. Subsequently, upon unloading, the crystal collects an opposite charge which is stored therein much like in a capacitor. This stored charge is then employed to activate the armed fuze upon impact of the projectile.
Inventors
- 👤 J Howell
- 👤 H Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:45
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/18; F42C15/188; F42C15/192; F42C15/196; F42C11/00; F42C11/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
231 words
A fuzing system in combination with a spin stabilized metal housed anti-tank projectile which comprises: a control power supply including, a source of electrical energy having a pair of terminals, an inertial switch connected across said source for shorting the same only when subjected to an acceleration in excess of a specific magnitude, an impact switch having one contact connected to one of said terminals of said source and having another fixed contact whereby upon impact said one and said fixed contact are connected, a fuze including; an electrical detonator having two contacts and capable of assumming one of two positions, a first steady state position and another position dependent on the spin of said projectile wherein said contacts are spin connected, an inertial leaf switch having a movable inertial leaf contact, a pair of opposed spaced apart electrically connected stationary contacts wherein said leaf contact will abut one of said stationary contacts, said leaf contact being disposed in the path of said detonator, whereby when said detonator assumes said another position one of its said contacts will mate with said leaf contact and prevent contact thereof with said stationary contacts, electrical means connecting together said fixed contact of said impact switch, the other contact of said detonator and said stationary contacts of said inertial switch, second electrical means connecting the other terminal of said source and said movable leaf contact.
Claim 2
Dependent Claim
231 words
A fuzing system in combination with a spin stabilized metal housed anti-tank projectile which comprises: a control power supply including, a source of electrical energy having a pair of terminals, an inertial switch connected across said source for shorting the same only when subjected to an acceleration in excess of a specific magnitude, an impact switch having one contact connected to one of said terminals of said source and having another fixed contact whereby upon impact said one and said fixed contact are connected, a fuze including; an electrical detonator having two contacts and capable of assumming one of two positions, a first steady state position and another position dependent on the spin of said projectile wherein said contacts are spin connected, an inertial leaf switch having a movable inertial leaf contact, a pair of opposed spaced apart electrically connected stationary contacts wherein said leaf contact will abut one of said stationary contacts, said leaf contact being disposed in the path of said detonator, whereby when said detonator assumes said another position one of its said contacts will mate with said leaf contact and prevent contact thereof with said stationary contacts, electrical means connecting together said fixed contact of said impact switch, the other contact of said detonator and said stationary contacts of said inertial switch, second electrical means connecting the other terminal of said source and said movable leaf contact.
Claim 3
Dependent Claim
26 words
The fuzing system according to claim 1 wherein said source of electrical energy is a piezoelectric element for generating energy under setback and release of setback.
Claim 4
Dependent Claim
24 words
The fuzing system according to claim 2 comprising a rotor, wherein said detonator is supported on and carried by said rotor for rotation therewith.
Claim 5
Dependent Claim
16 words
The fuzing system according to claim 3 wherein said impact switch includes a biased inertial element.
Claim 6
Dependent Claim
22 words
The fuzing system according to claim 4 wherein said metal projectile constitutes a portion of the circuitRy of said first electrical means.
Claim 7
Dependent Claim
14 words
The fuzing system according to claim 4 wherein said inertial element is a sphere.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |