US791111A

US791111A - Powder-die.

Info

Publication number: US791111A
Application number: US23165704A
Authority: US
Inventors: Alexis Felix Du Pont
Original assignee: Individual
Current assignee: Individual
Priority date: 1904-11-07
Filing date: 1904-11-07
Publication date: 1905-05-30
Anticipated expiration: 1922-05-30

Description

A. F. DU

PWDER APPLIOATION H-LE PATBNTED MAY 3 0, 1905. PONT. I

DIE.

D NOV. 7, 1904 w/TNEsSES Tram/U5 UNITED STATES Jatented May 3o, 1905.

PATENT OFFICE.-

POWDER-DIE.

SPECIFICATION forming part of Letters Patent No. 791,111, dated May 30, 1905.

' Application filed NOVGDlbI' '7, 1904:. v Serial N0- 231,657'

Be it known that I, ALEXIS FELIX DU PONT,

a citizen of the United States,residing at Wilmington, county of Newcastle, and State of Delaware, have invented a new and useful Imreference being had to the accompanying y drawings, which form a part of this specification.

My invention relates to certain improvement 1n dies for making powder of multiperforated form. In the ordinary method now in use for this purpose there are two presses-` one a double press, which first strains or screens the explosive and then consolidatesit, thus bringing it to the most satisfactory condition to pass through the die. The other press is used to force the explosive through the pin-plate and barrel of the die. There are thus two treatments or operations.

I have invented a die in which both the above treatments may be given the explosive in a single operation.

I'will iirst describe my invention as em bodied in the accompanying drawings `and then point out the invention in the claims.

In the drawings, Figure l is a vertical section of my improved die and one end of the pressing-cylinder. Fig. 2 is a top plan View of the screen-plate. Fig. 3 is a top plan View of the pin-plate.

A is the press-cylinder, and A the pistonhead in said cylinder.

C is the pin-barrel, having the head C externally threaded, whereby it is secured to the internally-threaded end of the cylinder A.

D is the pin-plate, having orifices a? and also pins 0l extending therethrough and riveted on the back side. These pins extend through the interior space of the barrel from end to v end. This pin-plate is secured or rests on the internal shoulder d3 of the barrel. Above this pin-plate D a distance suflicient to form a chamber E is the screening-plate F, resting or secured on the internal shoulder f. Preferably I make the screen cup-shaped, so that the cross-section forms an arch across the aperture of the die. Through this screeningplate F 'are orifices f', of smaller size but of .the powder therein has been greater number than the oriiices l in the pinplate D. The chamber above the screeningplate is lled with powder, which under the action of the piston-head A', operated by hydraulic pressure, is forced through'the screen-plate F and is blocked or consolidated in the space or chamber E, and is thenceforced through the perforations or orifices-d and through the barrel O around the pins CZ, coming out therefrom as a perforated grain having perforations equal in number to'the pins, seven being shown in the drawings; The pistoncontinues on its way through the chamber until all pressed out through the die.

By screening and blocking or consolidating the powder, as I do in my improved apparatus simultaneously with the pressing out into a string, I do away with the double press now used for straining and blocking the powder before putting it into the final press,which Vpressesrit into a string'. The screening-plate F also takes out any dirt which may be in the powder before it reaches the pin-plate, great trouble having been experienced heretofore by foreign matter lodging against the perforations in the pin, thus causing an unequal flow of the mass and a corresponding displacement of the pins. By having the perforations inthe screen smaller than the perforations in the pin plate all foreign matter will lodge against the screen, except such small particles as will also go through the pin-plate, and

thus not displace the pin. The perforations in the screen while smaller are more numerous than the perforations in the pin-plate and have alarger total area,so that more powdercan ow through the screen than through the pinplate, this inequality creating the blocking or consolidating pressure, before mentioned, in the space E.

My invention may be used for smokeless or other powder or for powders containing nitrocellulose or nitroglycerin or any explosive compound which it may be desirable to manufacture in the multiperforated form, provided its physical properties warrant pressing through a die.

It is obvious that a die on the same principle can be used to manufacture powder in the IOO form of rectangular strips` round rods or barrel, a screen Separated from the pin-plate, grains,` rods withone perforation, orany other forming between them Va conso]idating-chanidesirablezforrn. ber` a powder-receiving chamber back of the 35 Having now fully described my invention, screen, and means to apply pressure to the 5 whatI claim, and desire to protect by Letters powder. in the receiving-chamber.

Patent, is- 5. The combination with a die having a pin- 1. In combinationfwith adie having-a perbarrel-and an oriiieed pin-plate back of thc forated pin-plate and pins projecting therebarrel, of a screen back of the pin-plate, forln- 40 from, of a perforated screening-plate in line ing between them a consolidati11g-chamber, a

I0 with said pin-plate, there being a chamber lcylinder back of the sc reen, and apiston workforrned in the die between said screening-plate ing in the cylinder adapted to force the powand pin-plate. der successively through the screen, consoli- 2. In "combination, a powder receiving dating-chamber, pin-platey and pin-barrel. 45 chamber, a powder-consolidating charnbenfat 6. =The combination wlth a die h'avmga pin- 5 screen between said powder-receiving chambarrel and an orificed pin-plate back of the ibe'rfa-ndpowderfconsolidating chamber: and .a barrel, of an oriiicedscreen-backofithepin- .powderfforming .dieebeyond the consolidatyplate said .pinfplate and screcndueing spaced Aing-cchamber;` havin-g, a pin-barreLand meansv vapart,\ the oricesin the screen beingsmaller 50 `toappl-y'pressure'in thepoWder-,receiving andfrnore numerous-than theoriices in'tho 20ehamber, xtherehy,simultaneouslycernpress-y `pin1fplate, a cylinderbackofthe screen, and u-ingandiforming-the powder in .a single` oper-` .af piston working in the cylinder vadaptedto tation. force the powderthrough the-screen fand' con- B. -.In lcombination, .a {powder receiving 4solidate itin thc space between the screen and 55 `chamber1h a;powder-consolidatingchambena .pinTplate,.and thence throughthe pinvplatc -25 screen: between; said powderfreceivingcha-nr. and pin-barrel.

ybert-andipowder-consolidating chamber and .a 4In testimony. of-which inventiond have herc- `powderfforming de-barrel, vand-meansv to `apunto set: inyhand at VVihnington onthis 1st ;p1yjpressur.e!in.the receiving-chamber` there- `day of November, :1904.

I'by'simultaneously compressing fandiforming ALEXIS FELIX `DU PONT. .30 the powder in a single operation. y Witnesses:

A. 51ncombination, a diefhaving a pin-bar` REUBEN. SATTmrrUWArr,--J r.,

relandanoriicedpinfplate backof the pin-i v GLIFRORD -V. M-ANNERING.