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Publication numberUS392922 A
Publication typeGrant
Publication dateNov 13, 1888
Filing dateOct 3, 1887
Publication numberUS 392922 A, US 392922A, US-A-392922, US392922 A, US392922A
InventorsDavid Johnson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
David johnson and william dalkymple borland
US 392922 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

(Nomaden D. JOHNsoN s. W. D. BORLAND.


No. 392,922. Patented Nov. 13, 1888.

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Il l l l l l l l l l l l l 1 l l l l I l I l 0.. l l l lA l, l v l 0 UNITED STATES PATENT OFFICE,


SPECIFICATION forming part of Letters Patent No. 392.922, dated November 13, 1888.

Application Bled October 3. 1887. Serial No. 251,321. (No model.) Patend in England Augrt 18. 1886, No. 10,580; in A France September 19, 1887. No. 185,933; in Belgium September 19, 1887. No. 78,923; in Norway September 22, 1887, No. 660; in Italy September 30, 1857, No. 22.308; in Austria-Hungary March 2, 188B, No. 38,5521, and in Spain April 23, 1888,

To all whom it may concern:

Beit known that we,DAv1D JoHNsoN, re-

siding at 52 Fitzjohns Avenue, South Hampstead, London, England, gentleman, and WIL- LIAM DALRYMPLE BORLAND, residing at 35 Petherton Road, Highbury, New Park, London, England, chemist, subjects of the Queen of Great Britain, have invented certain new and useful Improvements in Cartridges, (for which we have received Letters Patent in Great Britain, No. 10,580, dated August 18, 1886; in France, No. 185,933,dated September 19,1887; in Belgium, No. 78,923, dated September 19, 1887; in Austria-Hungary, No. 38,553, dated March 2, 1888; in Italy, N o. 22,308, dated September 30, 1887; in Norway, No. 660, dated September 22, 1887, and in Spain, No. 7 ,427, dated April 23, 1888,) of which the following is a specification.

The object of this invention is to effect improvements in cartridges for military and sporting rifles, guns, and ordnance generally, for use with all kinds of powder.

The adoption of this inventionis serviceable with cartridge-cases of a bottle-necked shape, such as are used with the regulation Martini- Henry and Martini-Enfield rifles. It also allows a cartridge-case to be used of a cylindrical or slightly-tapered shape with practically the same bore throughout as thc bore of the gun. The length of the cartridgecase may also be materially shortened.

In charging the cartridge-cases we press the powder used into the case by a rammer havinga shoulder and a tapering pointed end. The powder is pressed practically into a solid mass with a centrallysituated conical or cylindrical cavity nearly but not quite through the charge. The size and depth of this cavity are regulated by the nature of the powder used and the purpose for which the charge is to be employed. Cylindrical cartridge -cases may also be charged by introducingaseparate cylinder of powder, prepared beforehand by pressure in suitable molds, and havinga cavity similar to that described above.

The solid end of the cylindrical charge is to be placed against the flash end of the case,the

open end f the powder-cylinder being thus adjacent to the bullet; The sides of the conical or cylindrical cavities may be varnished with any material that will increase the coherence, or, if requisite, render the charge waterproof; or a conical or cylindrical tube of nished, may be inserted in the cavity.

For heavy guns the charge may be made of several compressed blocks, which, when built up into a complete charge, may have one or more of such cavities, as have hereinbefore been described,extending from the ball end of the charge not quite through to the flash end.

The drawings annexed show examples -of cartridges formed according to our invention.V

Figure 1 is a longitudinal section of a'cartridge for a sporting-gun. Fig. 2 is a longitudinal section of a bottle-necked military cartridge. Fig. 3 is a similar view of a cylindrical or but slightly-tapering military cartridge, and Fig. 4 is a similar view of a military cartridge of larger size for a quick-firing gun.

In the drawings, A indicates the case, B the central primer, and C the powder-charge. The powder-charge C has a tapering central hole, D, diminishing in size from front to rear and terminating just before the primer is reached, so as to leave a part of the charge in front of the primer, whereby safety in loading and certainty in firing are obtained. As before stated, also, the charges of powder or explosive might be separately compressed in molds and bc afterward inserted into the cartridgecases. We, however, prefer to compress them into the cases themselves, both for simplicity and cheapncss, and also because the compressed charge then fits closely against the interior of the case and is notliable to be broken up when centrally ignited; also, as before stated, each charge may bc composed of powder of different rates of combustion compressed into separate sections. At Fig. 4 it is shown to be formed in five sections, marked a b cd ef. Section a `would first bc compressed, then the powder for forming section b would be filled in on the top of it, and b would be compressed,

and so on. Any suitable means may be adopted paper or other such material, plain orvarg sol for preventing theeentral hole formed in thc sections irst compressed from being filled in with powder used for forming the succeeding sections, or the powders of varying rates of combustion may be filled into the cartridge case in the order a b c d c f, and then pressed up.

lf a charge of powder bc compressed,as hereinbefore described, with a pressure approximating to or greater than the pressure to which it will be subjected when ignited in the bore of a gun, the charge will not be broken up when ignited,but will be burned in place. The powder first ignited will be the small quantity just in front of the primer, and it will not be necessary to employ a powerful prim`er to effect the ignition of this portion of the char e with certainty. The gases from this will d a free vent through the central tapering cavity to the rear of the projectile,1 so that the gases will exert their pressure directly upon the base of the projectile, and not, as is usual, upon an unconsumed portion of the charge which intervenes between the projectile and the first ignited portion.

Preferably we form the chamber in which the cap is contained with a central flash-hole at its front end, so that when the cap is ignited the dash may pass directlyto and ignite, rst, the small quantity of powder, which is immediately in front of it, so that the ignition of this small quantity of powder may insure the ignition of the remainder of the charge. This small quantity of solid powder, which is retained unperforated just in front of the capchamber, also enables us with safety to compress the powder into the eases after th'e cap has been placed in the cap-chamber, as the point of the plunger is not brought into contact with the cap-chamber, and the cap-chamber is of amply snicient strength to sustain the uniform compression which comes upon it by the compression of the powder.

We would state that we are aware that it has before been proposed to compress powder and explosive compounds into solid charges within the rear ends of cartridge-cases, and

also to compress blocks of explosive compounds separately in molds to be afterward inserted into cartridge-cases. It has also been proposed to form such solid blocks with a central hole of uniform diameter extending through them from end to endgand it has also been proposed to forni such blocks with a central tapering hole extending through aportion of the charge quite up to the capehamber, so that the flash from the Jprimer passes directly and without impediment into the cavity in the charge. It h salso been proposed to form such blocks wit a tapering hole extending i 'to them from the frontend; but in this case t e ig`nition of the charge was effected at the front end of the block, and not at the rear end, as in our cartridges.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is- 1. The cartridge hereinbefore set forth, consisting of the combination of the case, the central primer in its base, the charge com pressed into the rear end of the ease, and having a tapering central hole in the charge diminishing in size from front to rear 'and terminating just before the primer is reached, so as to leave a part of the charge in front of the primer, whereby safety inloading and eertainty in firing are attained, as set forth.

2. The combination, as herein set forth, of the cartridge-case, the central primer in its base, the charge composed of blocks, rings, or sections having different rates of combustion, compressed into the rear end of the ease, said charge having a tapering central hole diminishing in size from front to rear and terminating just before the primer is reached, so as to leave a portion of the charge in front of the primer to be ignited thereby before the flash enters the cavity in the charge.





24 Southampton Buildings, London, li'. C.


17 Gracechurch St., London, E. 0.

Referenced by
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US2420201 *Mar 7, 1942May 6, 1947Olin Ind IncBlasting cap
US2440568 *Jan 2, 1946Apr 27, 1948Roy C ArterCartridge loading
US2918868 *Apr 17, 1956Dec 29, 1959Lars RingdalCartridge
US3575112 *Sep 30, 1968Apr 13, 1971Hercules IncSegmented propellant charge for telescoped caseless ammunition
US3724870 *Feb 16, 1971Apr 3, 1973Asahi Chemical IndGas-producing device for an inflatable body-protecting bag on a high-speed vehicle
US3913482 *Jan 2, 1974Oct 21, 1975Buck K G FaManually-operated projectile-launching devices
US5194690 *Feb 21, 1990Mar 16, 1993Teledyne Industries, Inc.Shock compression jet gun
US5272828 *Aug 3, 1992Dec 28, 1993Colt's Manufacturing Company Inc.Combined cartridge magazine and power supply for a firearm
US5301448 *Sep 15, 1992Apr 12, 1994Colt's Manufacturing Company Inc.Firearm safety system
US5303633 *Jan 4, 1993Apr 19, 1994Teledyne Industries, Inc.Shock compression jet gun
US5421264 *Dec 2, 1993Jun 6, 1995Colt's Manufacturing Company Inc.Firearm cartridge with pre-pressurizing charge
EP0086382A2 *Jan 29, 1983Aug 24, 1983Mauser-Werke Oberndorf GmbHPropulsion charge for cartridge case munition and process for its manufacture