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Publication numberUS3610151 A
Publication typeGrant
Publication dateOct 5, 1971
Filing dateMay 9, 1969
Priority dateMay 9, 1969
Publication numberUS 3610151 A, US 3610151A, US-A-3610151, US3610151 A, US3610151A
InventorsRudolph E Nett
Original AssigneeUs Army
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Nonelectric squib assembly
US 3610151 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

United States Patent [7 2] Inventor Rudolph E. Nett Los Angeles, Calif. [21] Appl. No. 823,351 [22] Filed May 9, 1969 [45] Patented Oct. 5, 1971 [73] Assignee The United States of America as represented by the Secretary of the Army [54] NONELECTRIC SQUIB ASSEMBLY 1 Claim, 1 Drawing Fig. I [52] US. Cl 102/29 [51] Int. Cl. F42c 15/06 [50] Field of Search 102/27, 29, 45,497, 70, 86.5, DIG. 1

[56] References Cited UNITED STATES PATENTS 3,114,290 12/1963 Harvey et al 102/DlG. 1

3,129,663 4/1964 Schnepfe,.lr. 102/27 3,274,937 9/1966 Kyle l02/28X Primary Examiner-Verlin R. Pendegrass Attorneys-William G. Gapcynski, Lawrence A. Neureither,

Leonard Flank and Charles R. Carter ABSTRACT: A nonelectric squib assembly consisting of a squib body and a firing mechanism housing. The squib body includes a metallic seal separating a firing mechanism in the housing from a percussion primer in the squib body. The primary feature of the metallic seal is that it prevents missile motor pressure from producing a path for gases to flow back through the entire assembly. The metallic seal is dented by the firing mechanism to activate the primer thereby permitting primer gases to ignite a charge of boron-potassium nitrate carried in the squib body, which in turn is used to initiate the motor ignitor.

PATENTEU Gm 519?: 3,610,151

Rudolph E. Nefl INVENTOR NONELECTRIC SQUIB ASSEMBLY BACKGROUND OF THE INVENTION SUMMARY OF THE INVENTION The present invention provides a solution to this problem by providing a nonelectric squib which offers less hazard to operating personnel and property than the electric squib yet performs all the functions required of an electric squib. This perfon'nance is accomplished by a metallic seal that prevents missile motor pressure from producing a path for gases of flow back through the entire assembly. The seal also allows the use of a small charge to drive a firing pin to dent the seal and thereby initiate the squib. Final arming is performed external to the missile and late in the countdown thus reducing exposure of personnel to hazard.

This invention may be better understood from the following detailed description taken in conjunction with the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING The single FIGURE shown in the drawing is a sectional perspective view of the nonelectric squib.

PREFERRED EMBODIMENT OF THE INVENTION Reference numeral 1 indicates generally the nonelectric squib assembly. A firing mechanism housing 2 is shown in axial alignment with and attached at one end of a squib body and houses a small booster charge (not shown). The firing mechanism is secured to the squib body to complete final anning of the missile. A shear pin 3 holds a piston-type firing pin 4 until the booster charge forces pin 4 thus shearing pin 3 and allowing pin 4 to slidably move forward. The firing pin has an operating contact point 4: The squib body includes a first chamber 6 housing a percussion primer 7. A seal 8 is in a thin disc made of metal, such as copper,'and is attached in a position so that one side thereof is adjacent contact point 4 and the opposite side of the seal closes off one end of chamber 6.

This seal does not rupture when dented by contact point 4 and thus provides a hermetic seal for the squib body. The seal also prevents missile motor pressure from producing a path for gases to flow back through the entire assembly. An inner disc 9 is made of aluminum foil and located at the opposite end of chamber 6 separating this chamber from one end of a second chamber 10. The primer in chamber 6, when activated, will emit gases that will rupture disc 9 and thereby enter chamber 10 which contains an igniter charge such as boron-potassium nitrate (B-KNO identified by reference numeral II. A composite disc 12 at the opposite end of chamber 10 is a combination made up of a mica disc 13 and a mild steel disc I4. After the igniter charge is ignited, composite disc 12 ruptures to allow the output of the igniter charge to initiate the motor ignitor.

In operation a detonation wave is transmitted to the booster charge in the firing mechanism housing, the charge ignites and drives the firing pin forward shearing the shear pin. The contact point of the firing pin dents the metallic seal to activate the percussion primer. Alter the primer has been activated the primer gases rupture the inner disc and the gases are emitted into the chamber containing the igniter charge such as boronpotassium nitrate which in turn is ignited. The output of the igniter charge ruptures the composite disc and is then used to initiate the motor igniter.

I claim:

1. A nonelectric squib assembly for igniting a missile motor and for preventing gas flowback through the assembly comprising: a squib body having a firing mechanism housing at one end thereof, a first chamber and a second chamber; a filing pin mounted for slidable movement within said squib body, said firing pin having a contact point on one end thereof; a shear pin connected between said squib body and said firing pin to restrain movement of said firing pin until squib operation is started; a metallic seal disposed between said contact point and one end of said first chamber for hennetically sealing the firing pin from gases flowing back when the missile motor is ignited; a percussion primer disposed in said first chamber adjacent said metallic seal; a rupturable inner disc of aluminum foil separating said first chamber from said second chamber and sensitive to gaseous pressures from said primer; a missile motor igniter charge disposed in said second chamber; and a composite disc consisting of mica and mild steel discs at the opposite end of said second chamber for separation of said squib ignition from the missile motor, whereby missile motor pressure is prevented from producing a path for motor gases to flow back through the entire squib assembly.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3114290 *Oct 12, 1962Dec 17, 1963Earle M HarveyBreech sealing means for automatic firearms adapted to fire caseless ammunition
US3129663 *Aug 11, 1961Apr 21, 1964Aircraft Armaments IncFittings for low energy detonating cord
US3274937 *Apr 11, 1963Sep 27, 1966Physical Sciences CorpDetonation squib
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3789761 *Feb 2, 1973Feb 5, 1974Us ArmyPropagation transfer arrangement
US4265177 *Mar 26, 1979May 5, 1981Nitro Nobel AbDevice in blasting cap for low-energy fuse
US4541342 *Dec 5, 1984Sep 17, 1985Emi LimitedPyrotechnic device with metal diaphragm and metal insert
US4612857 *Jul 16, 1984Sep 23, 1986Mcdonnell Douglas CorporationBallistic gas fired device
EP0040011A1 *Apr 23, 1981Nov 18, 1981EMI LimitedArrangements for igniting a pyrotechnic charge
EP0122012A2 *Mar 5, 1984Oct 17, 1984Ici Americas Inc.Impact sensitive high temperature detonator
Classifications
U.S. Classification102/204
International ClassificationF42C19/08, F42C19/00, F02K9/95, F02K9/00, F42C19/10
Cooperative ClassificationF42B3/12, F42C19/10, F42C19/0819, F02K9/95
European ClassificationF02K9/95, F42C19/10, F42B3/12, F42C19/08G