US253344A - chiohester - Google Patents

Description

(lo Model.)

L. S. CH'ICHBSTEB..

APPARATUSTOR PULVBRIZING GRAIN, GRES, 650. NQ. 253,344.. l 'Patented-Ps1). 7,1882

' ffy l N. PETERS. Pholw/Liuwgnpher, wnhngmn. n, C.

UNITED ASTATES PATENT OFFICE.

LEWIS S. CHICHESTER, OF JERSEY CITY, NEW JERSEY, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO CHARLES G. FRANCKLYN AND WILLIAM FOSTER, JE., oF NEW YORK, N. Y.

, APPARATUS lFOR PULVERIZING GRAIN, ORES, 80C.

SPECIFICATION forming part of Letters Patent No. 253,344, dated February 7, 1882.

Application tiled April 19, 1880.

To all whom t may concern:

Be it known that I, LEWISl ScUDDER CHI- CHEsTER, of Jersey City, in the county ofHudson and State of New Jersey, United States ot America,vhave invented an Improvement in Apparatus for Dulverizing Grain, Ores, Minerals, and other Frangible Substances, of which the following is a specification.

`Before my invention a blast of air had been ro used for giving motion to particles of sand for engraving glass, stone, and other substances, andin the grinding of grain a current of air had been employed to aid the movement of the particles between two millstones, one of' 15 which revolved, andpercussion had been used for the pulverization of various substances, the same resulting from the action of rapidlyrevolving arms or surfaces.

In Letters Patent No. 230,468, granted to zo me, an issuing jet of air is described as imparting a rapid movement to grain or other Inaterial to move it along between conveyingsurfaces and cause it to strike the various corrugations thereof for pulverizing such matez 5 rial. A chamber has also been provided, from which frangible substances have been ejected against a target and shattered, thel propelling force being gunpowder, compressed air, or steam.

My invention relates to aniechanism for accomplishin g the same objects by two or more successive impacts in the same apparatus, whereby the required Iineness is obtained withont passing the material to be pulverized through the` apparatus so many times.

In carrying outmyimprovement I prefer to introduce the grain or other frangible material Athrough/a tube, around whichis a chamber for compressed air, and an'annular nozzle for the 14o jet of air to draw the material through the central pipe and throw it with great violence against a target that is placed opposite tothe issuing jet, and" around this target is a case, that not onlyincloses the scatteringfragments, but it also presents a surface against which they are brought into forcible contact by the rebound from the target, superinduced by the re-enforcing action of the current of air as it passes around the ed ges of the target, so that at (No model.)

least two points of impact are presented to the material to be pulverized. A second chamber with compressed air and an annular nozzle willusually be employed to direct the particles from the first reduction against a second target and the. interior of a second case, and thus secure the reduction ofthe grain or other frangible material to the requisite iiueness. In all instances the current of atmosphere acting around the material to he pnlverized imparts the required speed to obtain the maximum effect by the impact upon the target, and

\ the rebound of the shattered particles from the target causes them to enter the current of at- Inosphere where it is traveling with the great# est velocity. Thereby the maximum velocity is reimparted, and these particles are thrown olf by centrifugal action against the inside ofthe case, as the air is compelled to pass around the edges of the target, thus insuring the most efficient action with the use of the small est quantity of atmosphere traveling at a speedv that would not be safe or practicable with solid revolving devices.

In the drawings I have represented, in Figure 1, a section of the apparatus with two targets, and in Fig. 2 a face view of one of the targets, with the case in section at the line ww.

The chamber a is to be supplied with air from any suitable pump or compressor, and it is preferable to maintain a. pressure of four hundred or five hundred pounds to the square inch. The tube b conveys the air to the branch pipes c c and chambers d d'; and at e is a hopper with a pipe, f, through whichthe` from such target and passes around the edges thereof, and the shattered material, rebounding through the current of air, is propelled by the action of the air against the interiorof the case l and strikes upon the same along the portion marked i i, and is again shatteredand rebounds and is carried on through the tube m, and the additional supply of air at the chamber d', issuing from the orifice g', gives a fresh impetus tothe frangible particles to break the same against the second target, k', and case l. The convex shape of the target prevents the particles reboundingdirectlyagainst the movement of the impelling air and causes them and the air to diverge outwardly and pass more freely around the edges of the target within the case, as aforesaid, which case is sufficiently close for the material to strike and be further shattered by the second impact. The bridge for the target heilig behind such target, and having a central support to the back of such target, the air is allowed to pass freely around the edges of the target at all sides, and there is not any support extending from the target tothe nozzle or pipe from which the materials are discharged against such target. The support for thetarget being immediately behind the point oi' impact renders the target more rigid and effective than it would be it' supported at its edges, and the cross-bar for the central support is Ilot liable to be injured and worn by the material that is pulverized, as it is at a distance from the points ofimpact. More than two of these targets, cases,and airjets may be used, if desired.

I claim as my inventionl. The combination, in an apparatus for pulverizing grain, ores, and other materials, of a supply-pipe, a jet-pipe from which air under a high pressure is caused to issue, a target against which the material to be shattered is hurled, and a case surrounding the target and suiciently close to the same to confine the air, and against which case the materials are hurled by the current of air as they aredeilected from the target, substantially as set forth.

2. In an apparatus for pulverizing grain and other material, the combination, with the supply-pi pe, the jet-pipe, and the target, of a case around the target, against which the material is hurled as it is deflected from-the target, and which case is contracted, and a secondV pipe, and jet-pipe, connected with the case and a second target, substantially as specified, whereby the material receives two or more shattering impacts in the apparatus, substantially as specified.

3. In an apparatus for pulverizing grain and other materials, the combination, with the supply-tube and jet-tube for air under a high pressure, of aconvex target, against which the material is shattered and from which the said material passes freely as it rebounds, as set forth.

et. The combination, with the ejector and target in an apparatus for pulverizng grain and other materials, of a central support at the back of the target and a cross-bar for the same, substantially as set forth.

Signed by me this 15th day ot' April, A. D. 1880.

LEWIS SCUDDER CHICIIES'IER.

Witnesses WILLIAM G. Mo'r'r, CHAs. H. SMITH.

Images