US4374492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antipersonnel mine
Assignee: Raytheon Co
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Filing: 1976-04-02
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Granted: 1983-02-22
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Expires: 1996-04-02
Abstract
Abstract An antipersonnel mine is shown, a plurality of such mines being adapted to be loaded into a round of ammunition for dispersal and subsequent detonation at random instants. The timing for detonation of each mine is determined by the discharge of a capacitor, starting when dispersal occurs. The condition of the explosive lead of each mine before loading is indicated by a position indicator in the safing and arming mechanism.
Inventors
- 👤 Ernest Goldberg
- 👤 Gray C. Trembly
- 👤 William A. Zarr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:37
CPC Classifications
F; F42; F42C; F42C11/00; F42C11/001; F42C11/007; F42B; F42B12/00; F42B12/02; F42B12/36; F42B12/56; F42B12/58; F42C11/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
248 words
In an antipersonnel mine incorporating a delayed action electrical detonator, an improved timing arrangement for actuating such detonator, such arrangement comprising: (a) a first and a second capacitor; (b) means for charging the first and the second capacitor and maintaining the charge on both capacitors until a timing period is to be initiated; (c) resistor means, operative when a timing period is initiated, for discharging the first capacitor according to a preselected time constant; and (d) electronic switching means, interposed between the second capacitor and the electrical detonator, such switching means being latched in an unactuated state by the charge on the first capacitor during the timing period and being actuable by the charge on the second capacitor only at the end of the timing period to discharge the second capacitor through the electrical detonator when the first capacitor is discharged to a predetermined level, such switching means including: (i) a silicon controlled rectifier having the second capacitor connected to its anode electrode and the electrical detonator connected in series with the silicon controlled rectifier; (ii) means, including a first normally conducting field effect transistor, for grounding the control electrode of the silicon controlled rectifier during the timing period; and (iii) means, including a second normally nonconducting field effect transistor, for rendering such first field effect transistor nonconducting and for rendering such second field effect transistor conducting to connect the second capacitor to the control electrode of the silicon controlled rectifier at the end of the timing period.
Claim 2
Dependent Claim
248 words
In an antipersonnel mine incorporating a delayed action electrical detonator, an improved timing arrangement for actuating such detonator, such arrangement comprising: (a) a first and a second capacitor; (b) means for charging the first and the second capacitor and maintaining the charge on both capacitors until a timing period is to be initiated; (c) resistor means, operative when a timing period is initiated, for discharging the first capacitor according to a preselected time constant; and (d) electronic switching means, interposed between the second capacitor and the electrical detonator, such switching means being latched in an unactuated state by the charge on the first capacitor during the timing period and being actuable by the charge on the second capacitor only at the end of the timing period to discharge the second capacitor through the electrical detonator when the first capacitor is discharged to a predetermined level, such switching means including: (i) a silicon controlled rectifier having the second capacitor connected to its anode electrode and the electrical detonator connected in series with the silicon controlled rectifier; (ii) means, including a first normally conducting field effect transistor, for grounding the control electrode of the silicon controlled rectifier during the timing period; and (iii) means, including a second normally nonconducting field effect transistor, for rendering such first field effect transistor nonconducting and for rendering such second field effect transistor conducting to connect the second capacitor to the control electrode of the silicon controlled rectifier at the end of the timing period.
Claim 3
Dependent Claim
40 words
An improved timing arrangement as in claim 1 wherein the last two named means and the first and the second field effect transistors are complementary transistors in an integrated circuit, each one of such transistors having a high input impedance.
Claim 4
Dependent Claim
28 words
An improved timing arrangement as in claim 2 wherein the integrated circuit, the first and the second transistors and the resistor means are mounted on a common base.
References Cited (Backward Citations)
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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) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |