US2688920A - Gas generating cartridge - Google Patents

Gas generating cartridge Download PDF

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Publication number
US2688920A
US2688920A US328331A US32833152A US2688920A US 2688920 A US2688920 A US 2688920A US 328331 A US328331 A US 328331A US 32833152 A US32833152 A US 32833152A US 2688920 A US2688920 A US 2688920A
Authority
US
United States
Prior art keywords
charge
cartridge
annular
composition
spider
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US328331A
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English (en)
Inventor
Frank W Jarvis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Application granted granted Critical
Publication of US2688920A publication Critical patent/US2688920A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/04—Blasting cartridges, i.e. case and explosive for producing gas under pressure

Definitions

  • the present invention relates to an improved power gas-generating cartridge for the actuation of an engine starter of the kind wherein the gases generated by the cartridge impinge on the blades of the turbine of the starter.
  • nitrocellulose compositions which can support their own combustion satisfactorily and efficiently at pressures substantially higher than the working pressure of the turbine of the engine starter, there is provided in the engine starter a pressure controlling nozzle interposed between the cartridge breech and the turbine chamber. It is important that this nozzle should not become obstructed and that the blades of the turbine should not be damaged by projection from the cartridge of any loose uncombusted or incombustible components of the cartridge in the form of particles of any substantial weight and dimensions. It is also important that the nozzle should not become obstructed by the forward movement of the annular charge at any stage during its combustion.
  • spacing members to prevent displacement of the annular charge within a cartridge of the aforesaid kind for use in engine starters of the aforesaid kind has heretofore presented a difficult problem because the spacing members have to be provided in the cartridge by simple and convenient operations in manufacture and the possibility of their projection from the cartridge into the pressure control- 2 ling nozzle or on to the blades of the turbine of the engine starter must be absent.
  • a cartridge for an engine starter in accordance with the present invention of the kind comprising a rigid metal cartridge case having at its base an igniter and containing a cylindrical annular main charge of a colloided nitrocellulose composition capable of supporting its own combustion and having exposed internal and external cylindrical surfaces and end surfaces and also containing a charge of a granular kindling composition enclosed in an easily destructible container of flimsy construction interposed between the igniter and the base of said main charge is characterised in that the base of the said annular main charge has projecting therefrom stilts of self-combustible colloided nitrocellulose composition bearing against the base of the cartridge case to form a chamber for the enclosed kindling composition and spaced so as to provide free flame gas passage from the basal to the cylindrical surfaces of said main charge, in that a portion of the length of said annular charge has projections of self-combustible colloided nitrocellulose composition bearing against the cylindrical wall of the cartridge case and spaced to provide free gas passage along the outer cylindrical surf-ace, in that a top
  • the stilts of self-combustible colloided nitrocellulose composition projecting from the base of said cylindrical annular main charge prevent this main charge from rearward axial motion towards the cartridge case and thus protect the kindling composition from damage.
  • Said indestructible spider member prevents said annular main charge from having forward axial motion even while it is burning.
  • the face of said spider which bears on at least a portion of the end surface of the annular charge should be of such design as to continue to bear against at least a portion of the resulting end surface which is present throughout the burning of the charge.
  • the main charge is prevented against radial movement both by said projections of a selfcombustible colloided nitrocellulose composition and by the legs of said spider member.
  • Said stilts and projections may be made of a composition which gives on burning a gas at a higher temperature than the compositions of the main charge in order to facilitate ignition of said main charge.
  • the ignition of a portion of the outer cylindrical surface may be retarded by providing it with an adherent temporary coating of nonself-combustible or relatively less easily self-combustible film.
  • the stilts projecting from the annular cylinder may be preformed and cemented to the surface of the annular cylinder. They may consist of the same composition as the material of the annular cylinder, but a faster or slower burning composition may be used provided it is self-combustible.
  • the easily 'destructible container of the kindling composition may be in the form of a textile bag or a thin container of plastic material. It is I found in practice that the fragments of a thin cotton bag or a thin film of cellulose acetate or the like pass through the pressure controlling nozzle of the engine starter and between the blades of the turbine without damaging the latter.
  • the kindling powder may consist of grained black-powder.
  • the cartridge is sealed at the forward end against the entry of moisture with a disc of thin material such as Celluloid or cellulose acetate, and may further be provided at this end with a temporary protecting cap.
  • FIG. 1 is a plan taken on the line A-A of Fig. 2 looking towards the cartridge base
  • Fig. 4 is a right section through line B-B, looking in the same direction.
  • the cartridge case is made of brass and is drawn with a'thick base I which is outwardly flanged to fit into a breech in the engine starter.
  • the almost cylindrical Wall 2 of the cartridge case is thinner than the base and is shaped to ensure a close fit in the breech, which is continuously tapered.
  • an igniter housing 3 containing an electrical igniter 4 charged with fine grain blackpowder held in place by small thin Celluloid disc ll.
  • a muslin bag containing loose a kindling charge of a coarser grain of blackpowder 5 On top of this igniter is a muslin bag containing loose a kindling charge of a coarser grain of blackpowder 5, this bag having been cemented to a substantial portion of the area of the base
  • studs 8 of the same composition as the composition 9.
  • These studs are spaced in two staggered rows each of three studs at an angle of 120, one row being near the end of the annular cylinder bearing 9, and the other somewhat more than half way along its length. These studs are of sufficient thickness to enable the charge to fit snugly within the cartridge case.
  • the axial flame gas channel is best seen at 15 in Fig. 4 and as will be seen from Figs.
  • Embracing the forward end of the annular charge is a steel spider having a continuous annular discoid web II] from which project arms Ill. These arms extend outwardly and are then bent over so that a portion of their length is perpendicular to the plane of the web. It will be seen that as the arms lil' spring from the continuous annular web 10 they are first slightly bent in a forward direction before they are bent rearwardly, so that the forward surface of the spider is slightly dished with reference to the summit of the bend of the arms. The rearwardly bent-over portion of the arms Ii) ofthe spider can just be slipped over the end of the annular charge in the case of Fig. 1, or the wrapping of the forward portion of the annular charge in the case of Fig.
  • the central hole in the Web Ill is of greater diameter thanthe axial gas channel 15 of the annular charge I and it will be understood from the preceding account that the external diameter of the web 10 is smaller than that of the said annular charge, so that there is a free gas passage from the space between the wall 2 of the cartridge case and the outer cylindrical surface of the charge .1 into the portion of the cartridge of the charge. 1 around the igniter 4 and extending over the latter.
  • I is a single piece annular cylindrical charge extruded hot from a composition consisting mainly of nitrocellulose and nitroglycerine with lesser proportions of dibutyl phthalate, diethyl diphenyl urea, mineral jelly and potassium nitrate.
  • This annular charge is considerably greater in length than in thickness.
  • To the base of this annular charge there have been cemented at angles of 120 three stilts 9, of colloided nitrocellulose-nitroglycerine composition of faster burning characteristics than the composition of the annular cylinder 1.
  • the cement used for the purpose may be made by dissolving some of the composition from which the stilts 9 are formed in acetone.
  • a light cellulose acetate sealing cup H is. placed over the spider and provided with a sealing cement on its upper surface before the forward end of the cartridge case is turnedover the angle of the spider arms as shown at [2, so that the turn-over brings about a waterproof seal and retains the spider even after the cartridge has been used.
  • i3 is a stout removeable metal end-cap for protecting the mouth of the case and the cellulose acetate sealing cup I i from mechanical damage.
  • the charge of fine grain blackpowder in the electrical igniter 4 is ignited and immediately burns through the Celluloid disc ll, and brings aboutignition of. the kindling charge of coarser blackpowderii in the muslin bag 6. Flame gases'from the blackpowder charge 5 sweep along theaxial gas channel It of the annular charge 1 and also sweep past the stilts 9 into the channel between the outer cylindrical surface of .the charge land theJwall 2 of the cartridge case, sweeping past the stud-s 8 attached to the cylindrical surface of the former.
  • a cartridge for an engine starter of the kind comprising a rigid metal cartridge case having at its base an igniter and containing a cylindrical annular main charge of a colloided nitrocellulose compositioncapable of supporting its own combustion and having exposed internal and external cylindrical surfaces and end surfaces and also containnig a charge of a granular kindling composition enclosed in an easily destructible container of flimsy construction interposed between the igniter and the base of said main charge characterised in that the base of the annular main charge has projecting therefrom stilts of self-combustible colloided nitrocellulose composition bearing against the base of the cartridge case to form a chamber for the enclosed kindling composition and spaced so as to provide free flame gas passage from the basal to the cylindrical surfaces of said main charge, in that a portion of the length of said annular charge has projections of self-combustible colloided nitrocellulose composition bearing against the cylindrical wall of the cartridge case and spaced to provide free gas passage along the outer cylindrical surface, in that an indestructible spider member having an outer diameter
  • a cartridge as claimed in claim 1 wherein the easily destructible container of the kindling composition is in the form of a textile bag.
  • a cartridge as claimed in claim 4 wherein the easily destructible container of the kindling composition is formed of a thin film of plastic material.
  • a cartridge as claimed in claim 1 provided at its forward end with a temporary protecting cap.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
US328331A 1952-07-24 1952-12-29 Gas generating cartridge Expired - Lifetime US2688920A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB318026X 1952-07-24

Publications (1)

Publication Number Publication Date
US2688920A true US2688920A (en) 1954-09-14

Family

ID=10328632

Family Applications (1)

Application Number Title Priority Date Filing Date
US328331A Expired - Lifetime US2688920A (en) 1952-07-24 1952-12-29 Gas generating cartridge

Country Status (8)

Country Link
US (1) US2688920A (ja)
BE (1) BE520790A (ja)
CH (1) CH318026A (ja)
DE (1) DE952159C (ja)
FR (1) FR1072736A (ja)
GB (1) GB709611A (ja)
NL (1) NL92568C (ja)
SE (1) SE152326C1 (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920564A (en) * 1957-02-22 1960-01-12 Ici Ltd Engine starter cartridges
US2942547A (en) * 1958-06-24 1960-06-28 Olin Mathieson Gas generating assembly
US2949854A (en) * 1956-12-31 1960-08-23 Ici Ltd Power gas generating cartridges for the actuation of engine starters
US2985104A (en) * 1955-01-03 1961-05-23 Phillips Petroleum Co Improved cartridge for producing gas
US3126701A (en) * 1964-03-31 Process for generating gases
US20150027334A1 (en) * 2012-02-07 2015-01-29 Nikolay Nikolaevich Kireev Special cartridge (variants)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB594012A (en) * 1945-03-07 1947-10-31 John Stocks Flanders Improvements in or relating to cartridges for the projection of flame
US2464181A (en) * 1943-04-02 1949-03-08 Charles C Lauritsen Rocket device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB593927A (en) * 1945-06-20 1947-10-29 Thomas Thomson Improvements in or relating to electrically ignitable power gas generating blank cartridges
GB604489A (en) * 1945-11-26 1948-07-05 Edward Whitworth Improvements in or relating to power gas generating cartridges

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464181A (en) * 1943-04-02 1949-03-08 Charles C Lauritsen Rocket device
GB594012A (en) * 1945-03-07 1947-10-31 John Stocks Flanders Improvements in or relating to cartridges for the projection of flame

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126701A (en) * 1964-03-31 Process for generating gases
US2985104A (en) * 1955-01-03 1961-05-23 Phillips Petroleum Co Improved cartridge for producing gas
US2949854A (en) * 1956-12-31 1960-08-23 Ici Ltd Power gas generating cartridges for the actuation of engine starters
US2920564A (en) * 1957-02-22 1960-01-12 Ici Ltd Engine starter cartridges
US2942547A (en) * 1958-06-24 1960-06-28 Olin Mathieson Gas generating assembly
US20150027334A1 (en) * 2012-02-07 2015-01-29 Nikolay Nikolaevich Kireev Special cartridge (variants)
US9810512B2 (en) * 2012-02-07 2017-11-07 Nikolay Nikolaevich Kireev Special cartridge (variants)

Also Published As

Publication number Publication date
DE952159C (de) 1956-11-08
SE152326C1 (ja) 1955-11-08
NL92568C (ja)
GB709611A (en) 1954-05-26
FR1072736A (fr) 1954-09-15
CH318026A (de) 1956-12-15
BE520790A (ja)

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