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Publication numberUS3108540 A
Publication typeGrant
Publication dateOct 29, 1963
Filing dateApr 26, 1961
Priority dateApr 26, 1961
Publication numberUS 3108540 A, US 3108540A, US-A-3108540, US3108540 A, US3108540A
InventorsFletcher Robert F
Original AssigneeFletcher Robert F
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 3108540 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Oct. 29, 1963 R. F. FLETCHER MISSILES Filed April 26, 1961 FIG FIG.I.

INVENTOR Robert F. Fltcher United States Patent Office 3,108,540 Patented Oct. 29, 1963 3,108,540 MISSILES Robert F. Fletcher, Horsey, Va. Filed Apr. 26, 1961, Ser. No. 105,689

' 5 Claims. (Cl. 102-49) The inventionrelates to missiles, and more particularly to the provision of means whereby a casing severing explosive charge effects axial separation of the severed sections of said missile and/or may perform other functions in addition to the casing severing action.

The present specification and dra-wing include the disclosure of patent application Serial No. 26,772 tiled May 4, 1960, now abandoned, of which the present application forms in part -a continuation.

The invention consists in the novel construction and combination of parts, -as set forth in the appended claims.

In the accompanying drawing, illustrating the invention, FIG. 1 shows a perspective view, partly broken into section, off a cartridge constructed in accordance with the invention, together'with a portion of the casing `of a missile.

FIG. 2 isa fragmentary enlarged section, taken at arro'w A of F IG. l.

In this drawing the numeral 1 designates the outer casing of a rocket or other missile, within which is secured a cartridge having spaced upper and lower plates 2 and 3, located intermediate/ly of the missile in peripheral contact with the wall thereof land separating the same into sections. Said plates are connected by 'bolts 10 or other blast resistant connections designed together with such plates to withstand dismemberment or distortion by the explosion of the charge to Ibe described. The lower plate is formed with an upstandin'g marginal rim 4, secured -to the casing 1 at 11. A ldiaphragm 5 is supported upon the rim -4 and lies midway :of the interval between the plates 2 rand 3.

In the preferred form of the invention a relatively thin sheet of explosive material forms a disk 6, which is supported upon diaphragm S and presents a substantially unbroken surface from its center to a periphery adjacent to the casing of the missile. Around this periphery, disk 6 is formed with two outwardly tdiverging walls, faced with an l,outer band 7 of highly fusible material such as copper. Each of these walls is of approximately the same thickness as that of the central portion of the disk, giving a preponderance of explosive material adjacent the casing. Diaphragm lies in supporting contact with the plane central portion of explosive disk 6 and has an angularly disposed peripheral portion in contact with the loweti `of the diverging walls of such disk.

An ignition initiator S is mounted on the upper cartridge plate and conta-cts the sheet explosive disk at its center. This initiator may be of the self-contained type, with delayed action, or it may be actuated by a separate timer, both arrangements being well known in the art. As shown a timer or arming bar, indicated at 12, is mounted in the section of the casing which is to be severed and is connected to ignition initiator 8 by la lead 13 which passes through a tube in the cartridge.

The space between the upper cartridge plate and the sheet explosive is lled by a layer of cushioning material 9, which, together 'with the resistant nature 0f such upper plate, will protect the assemblies of the upper missile section against damage by the severing explosion.

It will frequently be necessary to connect installations in `missile sections which are to be severed from each other, by suitable conductors of energy, in which case such conductors must `also be severed. These installations ma-y have any one of a number of functions and may be designated as regulators 14, tand `activators 15, connected by a conductor of energy 16.

Conductor 16 passes through the cartridge,'intersecting the diver-ging walls of the sheet explosive disk 6 and thus being subject to the lateral casing severing blast.'

In operation, the central portion of the sheet explosive disk, being ignited, will exert thrust upon diaphragm 5 and will also act as a fuse to ignite the material Of the diverging peripheral walls of the disk. The band 7 is fused by the resulting explosion 'and a concentrated blast of gases andl molten metal is directed against the wall of the casing 1, severing said wall. Meanwhile the explosion of the central portion of the sheet, having compressedV the cushioning material 9 and overcome the resistance of the diaphragm 5, will buckle said diaphragm and drive it violently 'against the lowercartridge plate, the open space between diaphragm 5 and plate 3 serving las an expansion chamber. This impact will occur substantially at themoment of the fracture of the casing 1, will assist in separating the two sections of said casing, by propellingfone of said sections in an vaxial direction, away from the other. An additional impact against the lower plate 3 will be caused by a secondary action of the explosionY of the diverging walls of disk 6. That is to say that, in addition to the jet directed perpendicularly to the longitudinal axis of the missile, thisl explosion will exert force in a circular path, parallel to said axis, which, acting upon the narrow peripheral portion of diaphragm 5, extending at an angle to the central portion, will fuse this periphery. 'Ihe result will be not only to aid in buckling the diaphragm but to direct a circular jet against the bottom plate.

This utilization of the explosive casing severing means to effect separation of the severed parts is of advantage in securing synchronization of the two effects and it also allows for extreme simplicity of structure.

It may be noted that the separating cartridge is insertible into the missile as a prefabricated unit.

Obviously, a number of cartridges may be secured at spaced points along the missile, .and also, a nose portion of the missile is to be separated and thrown forward, a standard cartridge may be secured, in reversed position, at the proper point.

I claim:

l. In a missile having an outer casing;

a casing severing means comprising a cartridge secured in said casing and comprising end plates permanently secured to each other, a disk of explosive material extending across the cartridge and designed upon explosion to effect circumferential severance of the missile casing, and ignition means contacting said disk at its center;

said severing means being in combination with axial separation means comprising a collapsible diaphragm supporting said disk, formed of material substantially lighter than that of said end plates and normally separating said explosive material from the lower plate by an interval comprising an expansion chamber for the gases of combustion generated by explosion of said material ,and released by collapse of a diaphragm under pressure of said lgases.

2. In a missile according to claim l;

particularized in that said ldisk of explosive material is formed with a peripheral portion comprising two uuuwardly divergin-g wells;

and further p-articularized in that said diaphragm consists Aof a plane central portion and an angularly disposed peripheral portion in contact with one of the dive-rging walls of said disk.

3. In a missile according to claim l;

particularized in that said disk of explosive material is formed with a peripheral portion comprising two outwardly diverging walls, and in which the inter- 3 connected plates separate the space Within said oasing into sections; and further particularized in that said ignition means is mounted in one of said plates and extends into 5. A separation cartridge designed for insertion within a tubular structure;

comprising permanently interconnected end plates, a disk of explosive material extending across the one of said sections, a timer is mounted in the op- 5 cartridge and `designed upon explosion to emit la posite section, yand a lead from said timer tto the radial blast, and ignition means contacting said `disk ignition means passes through the interconnected at its center; plates. said disk being in `combination with means for Iaxially 4. In a missile having an outer casing, la regulating directing a portion of said blast comprising a coldevice secured to said casing `and an activating device lapsibile diaphragm supporting said disk, formed 0f therefor separately secured to said casing; material substantially llighter than that of said end a casing severing means comprising Ia cartridge at- Plates and normally separating said explosive maiached to Said easing, 10eme between the reguterial lfrom the lower plate by an interval Comprislating and the activating devices and containing e ing an expansion Chamber fOr the lgases of combusdisk of explosive material formed with a peripheral @on gellellalted by eXPlOSOIl 0f Said material and r6- pol'ltion comprising two outwardly divepging walls leased by collapse of the diaphragm under pressure terminating adjacent said casing, and ignition means 0f Said gasesconneoted to said disk; said severing means being in combination with an en- References Cited in the le of this patent ergy conductor connecting the regulating and activating devices and passing through the diverging UNITED STATES PATENTS Walls of the explosive material disk, whereby said 2,615,521 Ploulter 00L 2g, 1952 conductor will be severed by action of the ignited 2,654,320 Schmid .01ct 6, 1953 eXplOSiVe material, together with the severance of 2,684,030 Muskat et ai July 20,1954 the missile Casing; 2,699,721 K10@ Jan, 1g, 1955 and means for axially separating one or the severed 2,935,944 Sweetman May 10, 1960 portions of the casing lfrom the remainder of the missile.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2615521 *May 26, 1948Oct 28, 1952Inst Of Inventive ResApparatus for seismic exploration
US2654320 *Mar 7, 1949Oct 6, 1953Schmid Roy JSeverable aircraft
US2684030 *Nov 25, 1949Jul 20, 1954Gulf Research Development CoApparatus for slotting and cutting pipe
US2699721 *Feb 19, 1947Jan 18, 1955Seismograph Service CorpExplosive cutting device
US2935944 *Aug 7, 1957May 10, 1960Sweetman William GExplosive cutting tool
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3185090 *Feb 1, 1963May 25, 1965Thiokol Chemical CorpDual shaped charge separation system
US3230885 *Jan 23, 1963Jan 25, 1966Thiokol Chemical CorpExplosive separation device
US3244104 *Mar 25, 1964Apr 5, 1966Mills Jimmie RMissile separating device
US3248072 *Apr 1, 1964Apr 26, 1966Mcdonnell Aircraft CorpUnderwater explosive effects attenuator
US3352236 *Mar 28, 1966Nov 14, 1967Baker George WExplosive energy transfer means
US3384016 *Sep 6, 1966May 21, 1968Nasa UsaLateral displacement system for separated rocket stages
US3732818 *Sep 7, 1965May 15, 1973Thomanek FHollow-explosive charge construction
US4646642 *Mar 4, 1985Mar 3, 1987Diehl Gmbh & Co.Separating arrangement including an expansion chamber for a pyrotechnic charge
US5361676 *Jul 19, 1993Nov 8, 1994Gibbs Jerry LExplosively-separable fastener with umbilical cord cutter
US5698814 *Jan 11, 1996Dec 16, 1997The United States Of America As Represented By The Secretary Of The Air ForceHard target penetrator with multi-segmenting casing cutter
US5817969 *May 9, 1996Oct 6, 1998Oerlikon Contraves Pyrotec AgSpin-stabilized projectile with payload
US5864086 *Mar 23, 1998Jan 26, 1999Oerlikon Contraves Pyrotec AgSpin stabilized projectile with a payload
US6016753 *Aug 27, 1998Jan 25, 2000The United States Of America As Represented By The Secretary Of The Air ForceExplosive pipe cutting
US6148729 *Apr 27, 1998Nov 21, 2000Alliant Techsystems Inc.Missile severance device
US7661367 *Oct 8, 2004Feb 16, 2010Schlumberger Technology CorporationRadial-linear shaped charge pipe cutter
US8302534 *Feb 2, 2010Nov 6, 2012Schlumberger Technology CorporationRadial-linear shaped charge pipe cutter
US8561683Sep 21, 2011Oct 22, 2013Owen Oil Tools, LpWellbore tubular cutter
US20060075888 *Oct 8, 2004Apr 13, 2006Schlumberger Technology CorporationRadial-linear shaped charge pipe cutter
US20100132578 *Feb 2, 2010Jun 3, 2010Schlumberger Technology CorporationRadial-linear shaped charge pipe cutter
DE1300844B *Oct 22, 1965Aug 7, 1969Kugelfischer G Schaefer & CoAbschussrampe fuer drahtgelenkte Raketen
U.S. Classification102/378
International ClassificationF42B15/00, F42B15/38
Cooperative ClassificationF42B15/38
European ClassificationF42B15/38