US531379A - mathewson - Google Patents

Description

(NdMo-Ael.) 2 Sheets--Sh eet 1.

J. E. MATHEWSON.

FIGzB.

(N0 Medel.)

- A zsneetvsheet 2; J,- E. MATHEWSU a, SAND BLAST APPARATUW Patented Dec. 25, 1894.

NiTEn STATES JEREMIAH enemn mw cr, or SHEFFIELD, ENGLAND.

- 'sA'u cheer Arse-sari; s..

srncr warren remi s p r of setters eat- No. Enchanted December senses. 1

A-pplloatlon illed'I'ebrunry a, 1894, Ho; 499.482. is, model-l a wbb, whom; it may concern.- i

Be it known that I, JEREMIAH EUGENE MATHnwson, engineer,-of Bellefield Works, Sheffield, in the county of York, England, 5 have invented certain new and useful Im-- provernents Relating 'to'Sand-Bla'st Appara- .tus, of which the following is a specification,

' Myinvention' relates to asa'nd blast apparates, which is employed in ornamenting, cutto ting, orothe'rwise operating on various hard 'surfaceannd'has for its object to improve 4 .the general construction of the apparatus.

My invention consists first in arranging the fsandphoppeiwithin'an inclosin'g casing which "r 5 is filled with the fluid under pressure which.

serves as the propelling nredium,so that the sand will flow freely.

.. -Myinvention further consistsin providing.

a suitable plate or bracketyin the chamber .20 into which the sand flows from the sand hop- .per, and which I call; the contactor combin- 1ug chamber, and from which the. propelling medium carries the. sand to the blast pipe through which it is thrown against the sur- ,z 5 fface to be ornamented, the object of theplate N gbeing to insure that the sand supply will be {driven by. the air blast from near the center j of the chamber and also to form a sand valve in a-manner to be explained. 0' My further improvements will be pointed out in connection with the description of my invention, which is best explained by reference to the accompanying drawings, in

'which.-'. 5 Figure, 1 shows in sectional elevation a ma- .chine for delivering a horizontal blast, which is mostsuitable for metal, stone, and heavy work generally. Big. 2 shows asimilar view eta machipefer delivering blast upwar 49 this being the form most suitable for glass and light work, and Fig. 3 is a View taken on v a sectionline at right angles to;that taken in Fig. 1, showing the lower part of the sand hopper and the combining chamber below it 4 5 Referring first to the construction shown in Figs. 1 and. 3, which relates to whatI term the horizontal blast apparatus, A is a casing, preferably cylindrical, which is divided into .two compartments or chambers 1, 2, by the I '50 partition 18; This partition B, as shown, has

an opening or openings closed by a suitable valve or valves, as G, to permit from time to timeiof'thedisch arge of sand from com ngment 1 to compartment 2. InyFig. 1 I- have showna disk valve' carried bye spring actuated rod L for controlling this opening,

*In compartment 2, which .is made airtight,

except for the inlet and outlet cpen'iugs, is placed asand hopper A, which is conven i-ently supported on a casting D resting on or supported from the bottom ofthe casing A.

With this casting D is formed. what l'ierm. I the-jcoinbining-or contact chamber DI, since it"is here at the sand and the propelling inedinm rst combine or come in contach's The 'sand'passes fromthe hopper A to the chamber D bye passage c in the casting D, whichcan bs-opened or closed, as required, from the outside by a suitable valve E.- l I F.=is thehinletier.the prepell ng. manners which is scmefluid, as air, steam, dvc.,-duder pressure, and, as will'be noted, this fluid fills the compartment 2 so that there will \be the same pressure on the top of the sandi'n the' hopperA as at the discharge passage lead- 7 5 ing into the chamber D so that the sand can 'fiow t'reely-fz'om the hopper by gravity, en-

tirely uniniluenced by the pressure of thepropelling medium. "I prefer, as shown, to provide anopening, as indicated at d, from the compartment 2- into the combining chamber D, though of course the fluid under pressure could be introduced therein through any suitable conduit desired. 3 D is-a plate entowhreh the-sand falls from 8 the sand hopper, and the object of this plate, which is arranged about the middle of the tube, which serves as the contact chamber in Fig. l, is to keep the sand supply in the'cens ter of the contact chamber D' so as to insure go its being properly carried forward by the propolling fluid. The plate D further serves to form a sand valve when the apparatus is not being used. The sand falls on this plate and terms a little cone of sand whose-apex finally o5 closes the sandpassage which'leads from the hopper. It the plate were not employed the bining or contact chamber D, when neces m: in Hmmmmmompmtment,'

in Figm 1 mad 2.

1:) k '1. In a mud blast appamws the cbmbfna- 5 fiipu 01?. a wmpm'tmem; 01f chamber 3, a sand Mppm situated fihemin gm inlet into said magnumfor: a suitable compressed propelling m'wflium, eomhiuing or aun'taahchamber be mat-him mm hup gwr, an. passage fur the flow' 01: MM fmm mid hupper t0 the contact chain 1; 3:) 151m mm an iniet thamw for the propelling" medium. mud a mm for eonvaying awaythg mud driven by film propelling meflilzam. H T" fi. 3m mmrl' blmmfiappmsmufi, the eombirm 4 s'a'nere' I 3 tion 01 an air tight compartmentlor chamber 2, a. sand hoppe'nsitueted therein, an inlet into said chamber fore; suitable compressed propelling medium, a. "combining of contact 5 chamber beneath the send hopper, a passage: vfor the fiowot sand from said hopper to the] coniact chamber, an inlet for the propelling medium from the chamber 2 to the combining chamber, and an'ontlet from said combining 10131121111116! for the mixed send and propelling medium. f 3; In a sand blast apparatus, thecombinetion of a sand hopper, a combiningor contat' chamber into which-the sand fiows f'rom the. r5- hoppen-en inlet to said chamber for. fluid under pressure, a flexible pipe G'mf the same crosssection as the combining chamber, lead ing therefrom, and serui'ngj to conduct away. .the propelling medium mixed with sand, and 2s a. blast "pipe Hjof -reduced cross section sirranged on the end of the flexible pipe G' whereby the sand may haves comparatively slowiinotion in the flexible pipe andet'tai'n'" itsmeximum velocity only in the blestpipe. 4, In e'send blast-apparatus, the combine- I tion with a sand hopper, ot a combining or contact cha mber into which sand flows fromthehopper, an inlet thereto for fluid tinder pressure, a tube or pipe G leadinggfron'i said chnmbenie blast pipe-Hot reduced sizeon the end ofthe tubc,' cnd nn-outwerdly iiering tube Jon theend ofthe blast pipe, substam tially for the'pnrposespeeified. r

, j 5.. In a. sand blast apparatus, the combine- 3 tion of a sand hopper, eeombining orcontaet chamber into which thesand' flows from the T hopper, an inlet to'said chamber forfluid-under pressure, e flexible pipe Q of the same crosssection. as the combining chamber leading therefrom and serving :toconduct'ewhy the propelling medium mixed with send, a blast pipe H ofreduced cross-section zirrangedon the end oil the fiexiblepipe G, and e flaring pipe or tube J, into whichiheblast pipe H 5 opens,whereby the sand meyhave a coinperatively slow motionin ,the' flexible tube end attain its mnximnm-jvelocity in the vblast pipe, end so that the propelling medium may have BA'OhfiHCG to expend after leavingthe 5o blast pipe.

ii -e ,send blast zipper-ates, the combine: tionoii a's'end hopper, a combining or contact chem'beri-nto which the sand flows from the m PP an inlet for fluid under pressure 1 20 said combining or contact chamber and-e, "Fle platform, D in said chamberinto which the sand flows from the hopper.

'37. In a sand blast apparatus, a box or casing A divided into twocompertments 1. end-.2193; a suitable partition, a sand hopperin the up--=ee *pefcompertment 1, a. valved opening inihe partition whereby send can be supplied to the sand hopper, cn'inlet for fluid under pressure' leading into the'iowermost compattmentf ii contact or combining chamber underneath the hoppenen inlet trorn'th'e compartment ,2;

to the combining chamber and a blastipip'e leadingthe'refroin. 8."In e send blast apparettis "the eomhine-' tion with a suitable casing having an openin'gi 7Q" .1, of a; seed hopper est-A da said casing below the opening 12h pipeL'leeding from the casing outside of the hopper A, means for erecting a. current of air through the casing and out at thetube L, and a send blast pipe. 7

adapted tdthrow e'streem of sand against an object held overthe opening 1, all substantially as specified, and so that the fine dust and broken sandw'ill be separated from the unbroken sand and carried out of "the casing while the unbroken sandwill fell'into and be collected in the hopper A 9, In it send blcst'sppe'retu's the combine Hon-with en (sir tight casing or compartment, 2 to which fluid under pressure is supplied, 8

of-e receptecle for sand situated therein, a, combining or contact chamber below the receptacle, a passage for the flow of sand from said hopper to the contact chamber, a sec-.-

0nd chamber 1 through which the sand blast passes, a pipe opening from'the chamber 1 an ejector ada. ted to creete a current of air

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