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Publication numberUS3726220 A
Publication typeGrant
Publication dateApr 10, 1973
Filing dateJun 1, 1971
Priority dateJun 1, 1971
Publication numberUS 3726220 A, US 3726220A, US-A-3726220, US3726220 A, US3726220A
InventorsMac Donald H, Pitney L, Schultz R
Original AssigneeUs Army
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cartridge
US 3726220 A
Abstract
A low impulse sustained power cartridge for an initiator power source of energy to accurately and flexibly control the gas output to a system demand. The cartridge has a metering nozzle or throat constriction mounted in the forward end of the cartridge case adjacent the propellant grain by which a low impulse initial gas pressure is delivered that rounds off at peak pressure to sustain an even slow decay.
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Description  (OCR text may contain errors)

filtrate Etates atet 1 1 1111 3,726,22fi

MacDonald et al. 5] Apr. 10, 1973 54] CARTRIDGE 3,270,668 9 1966 Silver ..102/20 1 1 Hugh Macvonald, (1119911118911, 333331323 31321 $133112; 6 a1. ....l33

Roger Schultz, phlladelphla; 3,089,419 5/1963 Pollard ..102/39 Lennord L. Pitney, Levittown, both of Pa.

Assignee: The United States of America as represented by the Secretary of the Army Filed: June 1, 1971 Appl. No.2 148,561

References Cited UNITED STATES PATENTS l/l97l Ciccone et al ..23/28l Primary Examiner-Robert F. Stahl Attorney-Harry M. Saragovitz, Edward J. Kelly, Herbert Ber] and William Sommer 5 7 ABSTRACT A low impulse sustained power cartridge for an initiator power source of energy to accurately and flexibly control the gas output to a system demand. The cartridge has a metering nozzle or throat constriction mounted in the forward end of the cartridge case adjacent the propellant grain by which a low impulse initial gas pressure is delivered that rounds off at peak pressure to sustain an even slow decay.

3 Claims, 1 Drawing Figure PAIEmEnA R 1 01% 3,726,220

\NvENTozs HUGH D.MAC.DONALD,JR ROGER SCHULTZ LENNOED PITNEY 4 M MM ATTORNEYS CARTRIDGE The invention described herein may be manufactured, used, and licensed by or for the Government for governmental purposes without the payment to us of any royalty thereon.

This invention relates to cartridges, and more particularly, to a power cartridge for an initiator.

Existing initiator cartridges have been found unsatisfactory due to their delivering a high peak pressure at initiation and, immediately following, suffering a rapid pressure decay.

It is an object of the invention to provide an initiator cartridge that delivers gas with low impulse initiation and sustaining power.

Another object of the invention is to provide such a cartridge in which the delivered power is a more accurately and flexibly controlled gas output for a system demand.

These and other objects, features and advantages will become more apparent from the following description and accompanying drawing in which the sole FIGURE is a longitudinal sectional view of an initiator containing a cartridge embodying the principles of the invention.

The initiator, shown generally at 10, has a chamber portion 11 provided with a threaded rearward portion 12 for securing initiator cap 13 upon assembly with the improved cartridge 14 seated in the chamber 11. The cap 13 has an appropriate control passage containing an operative firing pin 15 when an actuating device (not shown) is connected to the cap external threads 16. The rearward end of the cap passage is internally threaded to secure a shipping plug 17. A shipping cap 18 similarly protects the forward end of the initiator, particularly during transit and storage, as it is secured to the external threads 19 on the chamber reduced forward nose which has a central energy delivering passage 20. A transverse locking or set screw 21 secures the sealed connection of cap 13 on chamber 11.

The cartridge head has a central passage 22, the rearward portion of which is enlarged to suitably secure primer 23 in fluid communication with the igniter pellets 24 positioned in the rearward end of the forwardly opening cartridge case. A cup-shaped pellet retainer 25 is threadedly secured to an internally threaded surface portion of the stepped internal surface of the cartridge case. The base of the retainer 25 has a plurality of apertures 26 to fluidly communicate pellets 24 with the elongated propellant grain 27 which has a central elongated passage 30 interconnecting its conically recessed end portions 28, 29. A cylindrically shaped inhibitor 31 surrounds the external lateral surface of the propellant grain 27 and, upon assembly, is cemented to the cartridge case internal surface and is in longitudinal alignment with the sidewalls of pellet retainer 25 and nozzle case 32. The rearwardly opening nozzle case 32 is cemerited to the forward internal surface of the cartridge case and has a forward centrally apertured base 33. A metering nozzle member 34, having a central throat constriction 35 intermediate conically tapering approach and exit surfaces 36, 37, is cemented to the inner sidewall of the nozzle case 32 with a rupturable tape seal 38 positioned intermediate the nozzle member 34 and nozzle case base 33 overlying the nozzle base central aperture.

The initiator cartridge provides a low impulse at mitiation and the delivered gas pressure rounds off at peak pressure to sustain an even slow decay, while having the capability to be responsive to changes of load. Thereby adequate propellant gas pressure is supplied to begin operation of a power take-up unit of an inertia reel or the like, without subjecting the unit to a pressure-peak shock. The slow decay sustains the near peak pressure over a time period necessary to operate the take-up reel.

Various modifications, changes or alterations may be resorted to without departing from the scope of the invention as defined in the appended claims.

We claim:

1. A low impulse sustained power cartridge for an initiator comprising,

a cartridge case having a forwardly opening propellant chamber and a primer in its rearward end, igniter pellet means in said propellant chamber adjacent said primer,

an elongated propellant grain in said chamber and having a central elongated passage therethrough, and

metering nozzle means cemented to the forward end of said cartridge case adjacent said propellant grain and in substantial axial alignment with said propellant grain passage, said nozzle means including a metering nozzle member having a central throat constriction intermediate conically tapering approach and exit surfaces,

said nozzle means including a rearwardly opening cartridge nozzle case cemented to the forward internal surface of said cartridge case, said nozzle case having a forward centrally apertured base, said metering nozzle member being cemented to the inner sidewall of said nozzle case, and a tape seal intermediate said nozzle member and said nozzle case base overlying the base aperture.

2. The structure of claim 1 wherein a plurally apertured pellet retainer is positioned intermediate said pellet means and said elongated propellant grain.

3. The structure of claim 2 wherein said elongated propellant grain has an inhibitor surrounding its external surface, said inhibitor being cemented to the internal surface of said cartridge case and in longitudinal alignment with said pellet retainer and nozzle case.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2994359 *Feb 20, 1956Aug 1, 1961Phillips Petroleum CoApparatus for and method of preparing bonded articles
US3089419 *May 8, 1961May 14, 1963Pollard Frank BGas-generating power source
US3270668 *Dec 29, 1964Sep 6, 1966Atlantic Res CorpWell-treating apparatus
US3305319 *Apr 2, 1965Feb 21, 1967James F KowalickPropellant gas generator
US3558285 *Oct 1, 1969Jan 26, 1971Us ArmyPropellant gas generator
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3905291 *Apr 11, 1973Sep 16, 1975Corbin Jr George TCartridge-actuated device and launching assembly using same
US4856433 *Jul 13, 1987Aug 15, 1989Scot, IncorporatedInitiator device with adiabatic compression ignition
US5345875 *Jul 7, 1993Sep 13, 1994Automotive Systems Laboratory, Inc.Gas generator
US5531474 *Apr 26, 1994Jul 2, 1996Breed Automotive Technology, Inc.Inflator assembly
US5622380 *Sep 21, 1995Apr 22, 1997Automotive Systems Laboratory, Inc.Variable nonazide gas generator having multiple propellant chambers
US5628528 *Jul 6, 1995May 13, 1997Automotive Systems Laboratory, Inc.Dual chamber nonazide gas generator
US5700973 *Nov 13, 1996Dec 23, 1997Automotive Systems Laboratory, Inc.Gas inflator having aluminum bead filter
US5738373 *Nov 13, 1996Apr 14, 1998Automotive Systems Laboratory, Inc.Gas inflator with ceramic foam balls
US5806888 *Jan 16, 1997Sep 15, 1998Automotive Systems Laboratory, Inc.Air bag inflator
US5808232 *May 5, 1997Sep 15, 1998Automotive Systems Laboratory, Inc.Gas inflator having aluminum or alumina bead filter
US7997203 *Aug 21, 2007Aug 16, 2011The United States Of America As Represented By The Secretary Of The NavyEmbedded and removable initiator for explosives
WO1995001946A1 *Jun 20, 1994Jan 19, 1995Automotive Systems LabGas generator
Classifications
U.S. Classification60/39.47, 102/290, 60/39.823, 102/530, 422/164
International ClassificationF42B3/04, F42B3/00, B60R22/46
Cooperative ClassificationB60R22/4628, F42B3/04
European ClassificationF42B3/04, B60R22/46D