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Publication numberUS3170399 A
Publication typeGrant
Publication dateFeb 23, 1965
Filing dateMay 18, 1951
Priority dateMay 18, 1951
Publication numberUS 3170399 A, US 3170399A, US-A-3170399, US3170399 A, US3170399A
InventorsHinman Jr Wilbur S
Original AssigneeHinman Jr Wilbur S
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Radio remote control mine circuit with no current drain
US 3170399 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Feb. 23, 1965 w. s. HINMAN, JR

RADIO REMOTE CONTROL MINE CIRCUIT WITH NO CURRENT DRAIN Filed May 18. 1951 INVENTOR. Wilbur I5- Hinrnun,r11-- ATTORNEYS future time.

United States Patent Theinvcntion described in the specification and claim I may be manufactured and used by or for the Government for governmental purposes without the payment to me of any royalty thereon.

This invention relates to'r'ernote control devices for detonating mines and more particularly to a radio operated remote control device wherein there is no current drain.

3,170,399 Patented Feb. 23, 1965 ice ta'nces for 'a given radio transmitter power output or with a lower power output at-a given distance.

Referring now to the drawings wherein FIGURE 1 shows an embodiment of the invention, the reference numeral 1 generally indicates a mine comprising a casing I 2 having an explosive charge and a partition 3 therein.

Irr'the'usual electronic remote control devices of the v class operated by remotely generated radio pulses, it is necessary to use one or more electron tubes to amplify the received signal in order to obtain sufiicient power to trigger the circuit or associated mechanical device. The filaments of such electron tubes are conventionally heated by means of a primary or secondary battery, which is thus under constant drain and consequently the life of which is relatively short. The electron tubes also require aplate supply battery which causes no serious problem since under the operating conditions in the field, the life of .the plate supply battery is generally equal to the shelf life of the battery. However, the relatively short life ofthe filament battery is a serious problem in certain military applications, such as a mine to be planted in enemy. territory and detonated by remote control at some An object'of the invention is an electronic remote control circuit in which no batteries are employed. Another object of the invention is a mine provided with a simple and inexpensive remote control receiver which shall have a comparatively long and unattendedlife due to the fact that there is no battery drain except when th receiver is being operated by a remote signal. Another object of the invention is a simple and inexpensive remote control electronic device for causing detonation of mines without requiring the use of batteries.

Another object of the invention is a remote control re-' ceiver for detonating mines which shall be comparatively free from the etfects of temporary interference.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from the following description and accompanying drawings in which: 1

The partition 3 separates the explosive charge from the electronic components and supports a detonator 4 therein. An antenna 6.in an insulating housing 7 is positioned in one of the walls of the casing 2 so as to be flush with the outside surfaceofthe wallas indicated by 16. The elec# tronic components of the remote control receiver are mounted on a subpanel 8 fixed in (the compartment 9 formed by the partition 3 and an end 211 of the casing-2. The compartment is filled with aninsulating compound 10 which holds the electronic components rigidly in the compartment andprovides waterproofing. To prevent premature detonation of the mine during. storage or while in transit, a metallic screw 12 is threaded through the antenna 6 into. the casing 2 to connect the free end of the ='antenna to the casing and thereby shortcircuit the coil 13.

When the mine is readied for use the screw 12 is removed.

FIGURE Zof the drawings shows a schematic diagram of the remote control receiving circuit of the invention in which the predetermined radio frequency resonant means comprises an antenna 6 connected to theantenna terminal of the inductor 13 which has its ground terminalconnected to the-casing 20f the mine. The inductor is tuned to a predetermined frequency by means of capacitor 13a. A rectifier 14 has one of its terminals connected to the antenna terminal of the inductor audits other terminal connected to a detonator 4 which is in turn connected to the plate member of 'a coldcathode gas-filled diode 15.

The rectifier is so connected asto produce a voltage of the desired sign at its terminal remote from the antenna connection. A capacitor'which is charged'by the current from the rectifierhas one terminal connectedto the recti- FIGURE 1 is a longitudinal sectional view of an embodiment of the invention. I

' FIGURE 2 is a schematic diagram of one form of the electronic device of the invention.

FIGURE 3 is a schematic diagram of a modification of the electronic device wherein greater sensitivity is obtained. I

Brieflythe invention, several embodiments of which are hereinafter described, consists of a circuit responsive to remotely generated radio frequency signals and so de-.

fier and its other terminal to the cathode of the diode 15. The cathode of the diode 15 is grounded to the casing 2.

In operation, the electromagnetic waves of predetermined frequency, generated by aradio frequency transmitter traverse the antenna 6 and cause an alternating current to flow in the inductor 13. This alternating current is rectified by the rectifier 14 which in turn charges the capacitor. The capacitance of capacitor 17 is chosen in consideration of either a prolonged or a series of signals of predetermined frequency and level at the receiver so as to obtain a desired charging time and thereby avoid premature detonation of the mine by interfering signals.

The Charging time may also be accomplished by substituting an RC network for the capacitor 17. When the Voltage of the capacitor is equal to or greater than the firing potential of the gas-filled cold-cathode tube, the gas in the tubeionizes and thecapacitor 17 discharges through the detonator and tube.- The detonator then'functions to actuate the explosive charge in the mine.

FIGURE 3 of the drawings is a schematic diagram of the circuit of the invention wherein a cold-cathode gasfilled triode 18, having a detonator in its anode circuit, is substituted for the diode 15 to obtain greater sensitivity.

Although the unattended life of the modification is de termined by the shelf life of the battery 19, the circuit V v, 3 described inconnection with FIG. 2, but in the modification the capacitors-voltage isapplied to-the grid to cause ionization of the gas in the triode. When the triode fires a current flows in its anode-cathode circuit to function the detonator and cause explosion of the explosive charge' in the mine.

I claim:

A radio operated remote control mine adapted to detonate only in response. to a radio frequency signal of predetermined frequency and intensity which is present for a predeterminedztime, said mine comprising in combination: a casin an ex losive char e, a artition, and electronic components in said casing, said partition separating said explosive charge ,frorn'saidt components; a detonator supported in'said partition and adapted to actuate said explosive charge; an insulating housing formed inone of theQwalls of said casing; a longitudinal antenna positioned in said insulatinghousing so as to be flush with the outer surface of said casing; a subpanellon-which said components are mounted; andzan' insulating compound filling the comaprtment in which said components. are placed,

said compound rigidly holding said components and protviding waterproofing therefor; said-electronic Components comprising: an inductor and a first capacitor in parallel forming a resonant circuit tuned to said predeterminedfrequency, one end of said resonant circuit being connected to said casing which serves as circuit ground, and the other end of said resonant circuit being connected to one end of said antenna, a rectifier and a second capacitor in series connected in parallel across said resonant circuit, said second capacitor being chosen so that a sustained current for said. predetermined time'frorn said resonant circuit is required to charge said second capaci- "tor, a gas-filled cold-cathode triode having an anode, a grid and a cathode, said grid and cathode being connected in parallel with said second capacitor, :1

battery providing grid bias voltage and anode voltage to said triode, said detonator being electrically connected in said anode-cathode circuit; the application to said antenna of a sustained radio frequency signal of i said predetermined frequency and intensity for said predetermined time producing an alternating current in said resonant circuit which is rectified by said rectifier and charges up said capacitor during saidipredetermined time to a voltage which overcomes said. grid bias voltage, the

1 gas in said triode thereupon ionizing and causing current to flow in said anode-cathode circuit functioning said detonator, actuating said explosive charge, and thereby detonatin g said mine.

References Cited by the Examiner 'VSAMUEL FEINBERG, Primary Examiner.

SAMUEL BOYD, Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1769203 *Apr 30, 1929Jul 1, 1930Buckley John PHelicopter
US2448020 *May 17, 1943Aug 31, 1948Darnell Richard CDevice for hidden explosive mines
US2659004 *Mar 12, 1948Nov 10, 1953Rca CorpNonresonant directive antenna
FR864373A * Title not available
SE91592A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3262388 *Apr 24, 1964Jul 26, 1966Mccarty Albert MElectric firing circuit for explosive charges
US3288068 *Apr 30, 1964Nov 29, 1966Jefferson Donald ETriggered exploding wire device
US3780653 *Sep 7, 1971Dec 25, 1973Us ArmySeismic inhibit circuit for rf mine sensor
US3834310 *Jun 18, 1973Sep 10, 1974Fats Co LtdRemote control circuit and apparatus for exploding explosives
US3885501 *Nov 16, 1973May 27, 1975Calspan CorpFail-safe electrical timer
US4296686 *Jul 25, 1979Oct 27, 1981Redon TrustRemote control device for activating or inactivating a pneumatic war mine
US4615268 *Nov 14, 1984Oct 7, 1986Nippon Oil And Fats Company LimitedRemote blasting system for effecting multiple-step explosion and switching unit for use in this system
US4685396 *Aug 21, 1985Aug 11, 1987Imperial Chemical Industries PlcMethod and apparatus for safer remotely controlled firing of ignition elements
US5027709 *Nov 13, 1990Jul 2, 1991Slagle Glenn BMagnetic induction mine arming, disarming and simulation system
US5038682 *Jul 25, 1989Aug 13, 1991Plessey South Africa LimitedElectronic device
US5159149 *Jun 24, 1991Oct 27, 1992Plessey South Africa LimitedElectronic device
US5458063 *Jan 14, 1994Oct 17, 1995Giat IndustriesDemining device
DE2929600A1 *Jul 21, 1979Feb 14, 1980Redon TrustFernbedienungsvorrichtung zum wirksam- oder unwirksammachen einer pneumatischen kriegsmine
DE3131332A1 *Aug 7, 1981Apr 8, 1982Nippon Oils & Fats Co LtdDetonation method and detonation system
DE3338936A1 *Oct 27, 1983May 9, 1985Diehl Gmbh & CoDetonating device for a defensive mine
Classifications
U.S. Classification102/427, 333/17.1, 102/219
International ClassificationF42C15/42, F42C15/00
Cooperative ClassificationF42C15/42
European ClassificationF42C15/42