Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2393629 A
Publication typeGrant
Publication dateJan 29, 1946
Filing dateJul 3, 1941
Priority dateJul 3, 1941
Publication numberUS 2393629 A, US 2393629A, US-A-2393629, US2393629 A, US2393629A
InventorsJr Harry C Grant
Original AssigneeSpecialties Dev Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Explosive cartridge
US 2393629 A
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

Jan. 29, 1946. H. 0. GRANT. JR

EXFLOSIVE CARTRIDGE Filed July 3, 1941 INVENTOR @12 CG'raezz/z: BY

ATTORNEY Patented Jan.29,1946

EFQLOSIVE CARTRIDGE Harry 0. Grant, Jr., New York, N. Y., assignor to Specialties Development Corporation, Bloomfield, N. J., a corporation of New Jersey Application July 3, 1941, Serial No. 400,981

11 Claims.

The present invention relates to explosive devices, and more particularly to an electrically actuated cartridge for creating pressure.

The present invention aims to provide an electrically actuated cartridge which, when fired, will generate a pressure suitable for actuating devices which in turn are adapted to control various operating mechanisms. For example, the pressure generated may be utilized for moving a piston which, directly or by connecting mechanism,

causes a cutter to pierce the closure disc of a receptacle containing a. medium under pressure, such as carbon dioxide, whereby the release of the medium is effected. ,A use of the cartridge for such a purpose may be in the operation of aircraft where emergencies may arise, against which protective measures may be taken, to eliminate or minimize the danger at hand. For example, it is desirable to provide airplanes with inflatable flotation bags to be filled with buoyant fluid to maintain the airplanes afloat on water. Another example, in airplane practice, is to utilize fire extinguishing apparatus which employs a fluid fire extinguishing medium under pressure.

An object of the present invention is to provide a simple inexpensive cartridge of the foresome t p Another object isto provide a cartridge of minimum size for creating a desired pressure.

Another object is to provide a cartridge which can be conveniently handled during manufacture, assembly, and use.

, Another object is to provide a cartridge adapted to generate a pressure which can be fully utilized.

Another object is to provide a cartridge which will not shatter and consequently will not clog up passages in the firing chamber.

Another object is to provide a cartridge which, after being fired, can be readily removed from the firing chamber and will enable a succeeding cartridge to be inserted.

Another object is to provide an electrically actuated cartridge adapted to be readily connected to electrical connecting devices of a standard design.

A further object is to provide an improved cartridge constructed of a plastic molding compound.

Other and further objects, not specifically enumerated above, will be apparent when described in greater detail in connection with the accompanying drawing, wherein:

Figure 1 is an elevational view of a cartridge illustrating an embodiment of the invention.

l 'lgureziaatopvlowoithecartridgcshownin Figure 1.

Figure 3 is an enlarged sectional view taken substantially along the line 3-3 On Figure 1.

Referring more particularly to the drawing, there is shown an electrically actuated cartridge comprising a body l0 and a capsule "ll attached to the body for containing a charge of an infiam mable pressure generating substance. The body preferably is constructed of an upper cylindrical member l2 and a lower cylindrical member l4 for purposes which will become apparent from the description hereinafter.

As shown in Figure 3, the upper body member 12 has a circular recess l5 at the upper surface thereof, and has a pair of spaced apart countersunk portions 86 in the recess l5, each of which registers with an aperture l1 extending downwardly through the member l2. The lower end of the member I2 is provided with a cylindrical plug portion l9 having a smaller diameter than the diameter of the upper body member l2.

The lower body member M has a circular recess 20 at the upper surface thereof adapted to receive the plug portion l9 of the upper body member l2.

If desired, the relative diameters of the recess 20 and the plug portion l9 may be such that a friction fit is provided. The recess 20 is deeper than the length of the plug portion [9 so that, when the upper and lower body members are assembled, a space or chamber 2| is provided at the interior of and intermediate the body members. It will be understood that the plug portion could be provided on the lower body member and fitted into a recess which could be provided in the upper body member.

The lower body member is further provided with a cylindrical plug portion 22 at the lower end thereof and has a pair of spaced apertures 24 extending from the recess 20 through to the lower end of the plug portion 22. The apertures 24 are spaced closer together than the apertures ll of the upper body member 12.

As illustrated in the drawing, the body Ill is substantially cylindrical to provide a cartridge of maximum strength with a minimum amount of material. However, in order to insert the cap in predetermined position in the chamber formed by-acartridge holder or breech structure associated' with'a firing chamber, for example as referred to herein, either '"or both of the body members may be provided with one or more radially projecting portions, lugs or ears 25. For example, two diametrically opposite lugs 25 may be provided on the lower body member It which are adapted to fit into corresponding recesses in the cartridge holder.

The body members l2 and I 4, illustrated herein, preferably, are formed of a plastic molding composition, suchas cellulose acetate or any other similar molding compositions which are well known. Such compositions can be readily molded whereby the body'members can be economically formed in any desired shape by simple and rapid operations. Furthermore, such molding compositions have good insulating properties, which are desirable in connection with the electrical actuating means of the cartridge which will be described hereinafter. If desired, the molding composition selected may be transparent to render th'e electrical actuating means visible, but in some cases a colored or tinted opaque or translucent material may be preferred. Molding compositions of the foregoing type are attractive in appearance and can be provided with surface ornamentation which enhances the cartridge.

Referring again to Figure 3, the charge containing capsule ii illustrated may comprise a cup-shapedmember or case 28 formed of any asoasaa of the materials which may be used for forming the body members l2 and I4. The cup-shaped member 28, preferably, has substantially cylin drical outer side walls 21, which areprovided x with inwardly and downwardly tapered or curved portions 29 at the lower or closed end of the member 26. At the upper end the cup-shaped member has a longitudinally extending cylindrical, or other suitably shaped, bore or cavity II formed therein for receiving a charge 32 of presa sure generating material, such as smokeless powder or the like. The bore II is also adapted to receive the plug portion 22 of the body member i 4, and the upper or open end of the member 28 is provided with'a substantially flat annular surface 24 adapted to contact the under side of the body member l4.

The cup-shaped member 26 may be. and preferably, is provided with a reinforcing member 25 formed of sheet metal or the like. The reinforcing member may be a substantially annular cylindrical ring or. extending about andcontiguous with the cylindrical side walls 21. The band has radially inwardly facing portions ex- "1; benesu'i. the 1 tapered; portions; norms member 28. The bottom' of the cu -shaped member 26 preferably is left clear to render the charge 32 visible, and, if desired, the reinforcing v band 85 may have one or more apertures therein (Figure 1) for viewing the charge. "As shown in the drawing, the band 35 terminates at a point adjacent but spaced from the upper end of the cup-shaped member 26 to leave the upper end slightly weaker by not being reinforced. The band I! may be secured to the member 28 in any suitable manner, for example, by spinning it into engagement with the member 28, by swaging it about the member 28, by forcing the member 26 into the band, or by molding the member in the 6 band.

portions and outwardly through the apertures i I ll of theupper body member l2.

"The upper ends 4| of the conductors also extend through, aperture 42 on a disc 44 of insulating material seated in the recess ii of the body member i2 andhave suitable plugs or connectors .45 secured thereto. The plugs 45 are spaced a suitable distance apart and are designed Cannon connectors. Byproviding a'two piece body, the ends 4i of the conductors carrying the plugs may be spaced to fit electrical connectors of a suitabledesign while the ends 31 carrying the bridge wire 39 are spaced closely together to enable them to fit into the relatively small charge containing bore. The space 2| serves for adapting the conductors to be spaced apart a desired distance at their ends.

In assembling the cartridge the leg portions or lower ends 31 are inserted through the apertures 24 of the lowerbody member and the bridge wire "is secured adjacent the free ends of the leg portions 31. The space provided by the recess 20 in the upper surface of the body member i4 is partially filled with an adhesive substance 4|. such as semi-liquid cellulose acetate, or the like. and the upper ends 4| of the conductors are inserted through the apertures ll of the upper body member l2. The body member I2 is then moved towards the body member 14 to lit the plug portion is into recess 20 and to contact the adhesive 48. Upon setting of the adhesive 46, the, body members I2 and I4 are secured together and the upper ends of the apertures 24 in the lower body member I! are sealed.

Thereafter an adhesive 41, such as semi-liquid cellulose acetate, is placed in the countersunk portions it and the disc 44 is placed in the recess i6 and may be held in place byan adhesive 44. The connectors or plugs 45 may then be secured to the ends 4i of the conductors.

The cartridge as thus assembled is now ready to have the charge containing capsule. connected thereto. To accomplish this, an adhesive isiappiied to the annular surface 34 of the cupshaped member 26 and to the surface of the body member adapted to be contacted by the aforesaid-surface, Preferably, the adhesive used is a compound adapted toslightly soften the material of which the members i4 and Itare formed. For example, the adhesive may comprise a mixture of cellulose acetate and acetone. The plu portion 22 is then inserted into the bore II, and the members l4 and 28 are firmly pressed to gether, when the adhesive sets, a bond or her- 'metic seal is provided at 49 which cooperates with the seal formed by the adhesive 4| to prevent the'charge of explosive material from absorbing trical actuating means are provided, which may comprise a pair of electrical-conductors each having a le portion 31 extending through one of the apertures 24 in the body member i 4 and into the charge of powder 82. The free ends of tho leg portions 31 are electrically connected by,,a high moisture.

In operation, the cartridge is placed into a suitable holder with the capsule Ii extending into a firing chamber for receiving the pressure generatedby the charge. when an actuating pres- 'ture is desired, the conductors through their electrical connections. are connected manually or automatically to a'sourcc of electrical energy.

The current passing through the conductors andthe bridge wire 38 causes the latter to be resistance wire or bridge wire 3! adapted to 'be- 10- heated and ignite the powder, or the explosive or electrically heated to" ignite the char e u. The conductorsvhave offset portions 40 a ove the leg portions, which extend substantially radially outwardly in the space 2| within the body. and have pressure generating medium 82 contained in the 4 capsule II. the. powder burns-it "creates a pressure whichriiptures the seal or bond 40 be! r tween the members l4 and 25 and separates these upper ends 4| which extend upwardly from the. B members. generated m mp and can be utilized as a source of actuating power.

,During the burning of the powder within the member 26, the band or ferrule 35 prevents bursting or shattering of the cup-shaped member. Also, separation of the members 14 and 26 is delayed until all of the powder has been ignited, thereby insuring a maximum pressurefor a given charge of powder. When the members [4 and 26 are moved apart there is no violent shattering effect which tends to disintegrate portions of the cartridge.

From the foregoing description it will be seen that the present invention provides a new and improved cartridge for generating a pressure or for similar purposes. The cartridge is simple in design and can be economically manufactured. The parts of the cartridge can be readily assembled, without special tools or machinery, in a minimum amount of time jBy utilizing a plastic molding composition, the explosive charge is insulated from heat which over a prolonged period may accidentally ignite the charge. Also, thecharge is adapted to be sealed against moisture "be embodied in other forms of construction without departing in any manner from the spirit and scope of the invention, and I therefore do not wish'to bestrictly limited to the disclosure,

. but rather to the scope of the appended claims.

I claim:

1. In a cartridge of the class described, the combination of a cuprshaped member for containing a charge of powder, a body member secured to said cup-shaped member and having a pair of apertures extending therethrough in substantially uniformly spaced relationship, and a second body member secured to said first body member and having a pair of apertures extending therethrough in substantially uniformly spaced relationship and spaced apart a greater distance than the apertures in said first body member, one of said body members having a recess at the interior of and between said body members, said recess providing communication between the first and second pair of apertures.

2. A cartridge of the class described comprising a cup-shaped member for containing a charge of powder, a body member secured to said cupshaped member and having a pair of apertures extending therethrough in substantially uniformly spaced relationship, a second body member secured to said first body member and having a pair of apertures extending therethrough in substantially uniformly spaced relationship and spaced apart a greater distance than the apertures in said first body member, one of said body members having a recess as the interior of and between said body members, and electrical actuating means extending into said cup-shaped member, said means including a pair of electrical conductors each adapted to extend through one 01' the apertures of the first and second body members and adapted to pass through the recess between said body members.

3. A cartridge of the class described comprising a cup-shaped member for containing a charge of powder, a body member secured to said cup shaped member and having a pair of spaced apertures extending the refihrough, a second body member secured to said first body member and having a pair of apertures extending therethrough and spaced apart a. greater distance than the apertures in said first bod member, one of said body members having a recess at the interior of and between said bod members, electrical actuating means extending into said cup-shaped member, said means inpluding a pair of electrical conductors each adapted to extend through one of the apertures of the first and second body members and adapted to pass through the recess between said body members and'projecting outwardly from said second body member, and electrical connecting means on the outwardly projecting ends of said conductors adapted to fit an electrical connecting device of standard design.

4. A cartridge of the class described comprising a member for containing a charge of powder, a body secured to said member, electrical actuating means carried by said body, and outwardly projecting means on said body adapted to fit into corresponding recesses of a cartridge holder associated with a firing chamber, whereby the cartridge is adapted to be inserted into the holder in a predetermined position.

5. In a cartridge of the class described, the combination of a, cup-shaped member for containing a charge of powder, a reinforcing member extending about the side walls of said cupshaped member, a body member having a pair of spaced apertures extending therethrough, means for securing said members adapted to be rendered ineffective when the powder is ignited, and a second body member secured to said first body member and having a pair of apertures spaced apart a greater distance than said apertures in said first body member.

6. A cartridge of the class described comprising a cup-shaped member for containing a charge of powder, a reinforcing band extending about said cup-shaped member, a body member having a pair of apertures extending therethrough, means for securing said cup-shaped member and body member adapted to be rendered inefiective when the charge is ignited, a second body member secured to said first body member and having a pair of apertures spaced apart a greater distance than the apertures in said first body member, one of said body members having a recess providing a space at the interior of and between said body members, and electrical actuatin means extending into said cup-shaped member, said means including a pair of electrical conductors each adapted to extend through one of the apertures of the first and second body members and adapted to pass through the space between said body members.

7. A cartridge of the class described comprising a cup-shaped member formed of a plastic molding compound and adapted to contain a charge of powder, an annular metal reinforcing member extending about the side walls of said cupshaped member, a body member having a. pair of spaced apertures extending therethrough, adhesive means for securingsaid cup-shaped member and said body memberg aise'cond body member secured to said first body member and having a pair of apertures spaced apart'a greater distance than the apertures in said first body member, said body members being formed of a plastic molding compound and one of said body members having outwardly projecting means thereon, one or said body members having a recess providing a space at the interior of and between said body members, electrical actuating means extending into said cup-shaped member. said means including a pair of electrical conductors each adapted to extend through one of the apertures of said first and second body members and adapted to pass through the-space between said body members and projecting outwardly irom said second body member, and electrical connecting plugs on the outwardly projectingends of said conductors adapted to fit an electrical connectingjdev'ice of '10 standard design.

8. h A cartridge of the class described comprising a cup -shaped member for containing a'charge of powder; a body member secured to said cupshaped member-and having a pair of apertures extending therethrough in substantially uniform- 1y spaced relationship; a second body member secured to said first body member and having a pair of apertures extending therethrough in substantially uniformly spaced relationship, spaced apart a greater distance than the apertures in said :flrst body member, and offset with respect to the apertures in said first body member; one of said body members having a recess at the interior of and between said body members; electrical actuating means extending into said cupshaped member, said means including a pair of 2,393,029 h the pressure created without shattering of said first member. V b A 10. A pressure creating cartridge of the class described comprising a body adapted to be seated ina cartridge holder, a cup-shaped member hay-' ing a space adapted to contain a charge of an inflammable pressure creating substance, electrical "charge igniting means on said body and having portions'extendinginto'said memb a electrical conductors each adapted to extend I through one of the apertures of the flrstand sec-. and body members and adapted to pass through the recess between said body members; and means in said recess providing a seal between said pairs of apertures. I q

9. A pressure creating cartridge of the: class described comprising a body adapted to be seated in a cartridge holder, a member having a space,

adapted to contain ,a charge oi. an inflammable pressure creating substance, electrical charge igniting means on said body and having portions extending into said member, a, reinforcing member extending about and united with said first member, and means connecting said flrst member and said reinforcing member as a unit to said body, said connecting means being adapted to be rendered ineffective when the charge is ignited and creates pressure, whereby said first mentioned member and said reinforcing member are adapted to separate from said body as a. unit and release metallic band-shaped relniorcing member e ding about the side wall of andipermanently united with said cup-shaped member, and means connecting said cup-shaped member and said reini'orcing member as a unit to said body, said connecting'means being'adap'ted to be" rendered in effective when the charge is ignited and creates pressure, whereby said cup-shaped member and said reinforcing memberfare adapted to separate from said body as a unit and release the pressure created without shattering of said cup-shaped member. I v V,

' 11. A pressure creating 'cartridge oi the class described comprising a body adapted to be seated in acartridge holder, a transparent substantially cylindrical cup-shaped member having a space adapted to contain a charge of an inflammable pressurecreating substance; electrical charge igniting means on saidbody andha'ving portions means being adapted to be rendered ineffective when the charge is ignited and creates'pre'ssure,

whereby said cup-shaped member and said re iniorcing member are adapted to separate from 188311 body as a unit and release the pressure created without shattering of said cup-shaped member.

HARRY 0. GRANT, .m.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2564209 *Jan 25, 1950Aug 14, 1951Bendix Aviat CorpExplosive operated motor for rip cord
US2916994 *Aug 7, 1957Dec 15, 1959Olin MathiesonElectric blasting caps
US2965033 *Oct 19, 1956Dec 20, 1960Hercules Powder Co LtdBlasting cap assembly
US3059576 *Sep 26, 1958Oct 23, 1962Conax CorpElectrically fired detonator
US5044278 *Jul 3, 1989Sep 3, 1991James E. MeagherElectrically ignitible cartridge system
US6578487 *Dec 8, 2000Jun 17, 2003Special Devices, Inc.Pyrotechnic initiator with a narrowed sleeve retaining a pyrotechnic charge and methods of making same
US20120118189 *Nov 10, 2011May 17, 2012Masayuki YamazakiIgniter assembly
Classifications
U.S. Classification102/202.9, 361/248, 102/202.14
International ClassificationF42B3/12, F42B3/00
Cooperative ClassificationF42B3/103
European ClassificationF42B3/103