US1986906A - Nozzle for sand blast machines - Google Patents

Description

Jan. 8, 1935. R. w. WEIR NOZZLE FOR SAND BLAST MACHINES Filed March 5, 1930 in jp' in t the x 7 I penetrated The object ofitheipresent vision of J alinovel, formlof nozzle {for an b1" machines wl' ich isfihighlheceno greater durability th ployed.v H yrheccmmonrdrm ofnEizZIe low-resistance metal quicklyw rs eraiiy used,fitsf;lifel Changing thesefno'zz s gwheir'wo 3% bf n l b h ime' ii b tha t ting "down, substituting new Tnozfzles,

t n started -We i n hsy lb z es a relatively long, oecursnipsu jbeyond the c rijv ing point, whichflatt'e'ris within the, zne

inletis' sufficient to give animate:

To attainl'the purpose fthe 'prese the lattenseeks to-'providea nozzle ing a runwa brdadlbl an appropriate dischar portioriedwithrespect to t charge end asjtofca'use the m dam p in rear or tneeiscnargeenriso as toiiiej" by he air, and thereby form an inter nal conicalsandiiozzle with its converging point outside of the discharge end of the nozzle structure. Thus, the "vena contracta or converging area is outside the discharge opening of the nozzle structure, and not within the bore of the latter, avoiding wear on the nozzle due to the diverging of the abrasive from the converging area and the expansion and rebound against the sides of the nozzle. i l

Furthermore, by the form and arrangement of nozzle contemplated by the present invention economy of use of expensive metal alloys in the construction of the nozzle may be effected, thus enabling the employment of high-resistance alloys in the manufacture of the nozzle andprolonging the life of the nozzles over those formed of low-resistance metals solely.

Other objects of the invention will appear as the nature of the improvements is better understood, the invention consisting substantially in the novel construction, combination and arrangement of parts hereinafter fully described, illuspointed out in the appended claims.

: t t me u n mtion u l npis i w x th'holde diameterthan,suchbore. w

H rior fscrewthreads thereon;; and mjounte'd on said discharge 2 1w 1follower'capj 16 which is interiorly screw threadedjas at "17, to engage 'with the;

, the ioll'ovcfercapifi, or thatedgewhich is most elevation thereof viewing the R y w.weir,ohicago. 111., signer id Marsala! k v l Blast "Manufacturing ,c'ompany, chi g m a sleev ..'or tubeand one" of 11 tofprovidefor the ling agent, such as];conipressed ef no'zzle'. ".Ihe end i of the holder 10 time: the head l2the bore or TH ad'iilz ha .eX

threadsld of fthe head 1 2. At theout'er edge of remote from the head 12 when the cap 16 is assembled on said head, is provided an inwardlyextending flange 18. This flange affords a dam Arranged between the flange 18 ofthecap 16,

and resting against the flat outer end of the discharge head 12, is a pair of flat closure disks 20. The flange 18 bears against these disks and, when the cap 16 is screwed upon the head 12, said flange clamps the disks 20 in firm contact-with the flat. face of the discharge head 12. Each of the disks 20 is provided with a centrally-disposed opening 21 surrounded by a countersunk portion 22. The

countersunk portions cooperate to form an annular recess about the openings 21 in which is positioned a perforated disk nozzle 23.

The disks 20 may be formed of any suitable material, such as cold-rolled steel, but the disk nozzle 23 is formed of a metal alloy of such character, as to givehigh resistance to the abrasive agent or et toithe accompanying draw-, ighatesthe nozzle holderl r nged diametrically; thereby faces of the disks 20 in which the countersunk portions 22 are formed abut each other, and these a supplypipe orhose-bywhich the" I thethreaded"end' flitisienlarged tofl.

ge head '12 theface of which isfiatLL w v i communicates with an n opening 14 in the head 12, which opening is inline v1. withthe bore of the holde'r"10, butof material which is passed through the nozzle.

The disk nozzle 23 is loosely received in the recess formedbetween the disks 20 so as to be readily removable therefrom, and replaceable by a new v thejdis'k nozzle 23, may bereadil v y required! The nozzle "avoidsjthe frequent re one in the event that replacement is required.

, The disks 20 also are removable from the nozzle :structure, the only securing means being the follower'cap 16 and its flange 18 in clamping cooperation with the head 12.

With the parts assembled as illustrated in Fig.

1, it isv apparent that a distinct chamber,,such as designated by the numeral 13," is formed at the interior of the nozzle holder adjacent-to the disks 20. In the passage of the sand or other abrasive material the disks 20 cause the sand to dam up":

in the chamber 13. As the rair penetrates the sand, in order to escape through thejperforated disk nozzle 23, a conical nozzlelofihesand or.

other abrasive will be formed within the cham-' ber 13, as conventionally illustrated at. 24 in Fig.

1, with its converging point outside of the nozzle structure.

or converging area outside the discharge open This positions the veins contracta portionsubjcted intheimainltdthe action of the I abrasive. 'I'hisbein'g a"relativelyismall part per-' mits *tlie ,isame to be made of jhigh-rfesistance alloys, sofas toresist wear, thcreby'attaining the high degreeofTefliciency for ;theinozzle above re-.

ferred to. 1 The life of the nozzle is prolonged and small expense with facility, and eas hen such is newalsincident to, the .use of nozzles" of the form now commonly employed.

. IbliLiln:

1. A,. nozzle for use in; afblastmaehine, comprising a tubulai holder enlarged atone of its ends to .fdlm ,3. head Provided "at its interior with'a chamber, said chamber'being. of greater diameterjthan the bore "of the holder," s'aidhead h'aving'a fiat face wherein' a discharge openingis i laeed at 1 formed, said discharge opening communicating with said chamber, whereby the abrasive material is caused to form itself into an internal nozzle within the tubular holder and at the discharge end of the nozzle and the converging point thereby located beyond the discharge end of the nozzle.

2. A nozzle for-use in a sand blast machine,

comprising a body'portion having a chamber at its discharge end and an opening in communication with said chamber, a plurality of closure disks arranged over said opening, said disks having aligned openings in communication with said chamber, a removable perforated disk nozzle arranged between said closure disks at the opens ings thereof, and means for holding said disks in engagement with the body portion to close the opening thereof which is in communication with the chamber of the head, said closure disks causing theabrasive material to form itself into an internalnozzle within the body portion and at the discharge end of the nozzle and thereby to locate the converging point beyond the discharge end of the nozzle;

3. A nozzle foruse in a sand blast machine,-

comprising a tubular holder enlarged at one of its ends-to forma" head provided at itsinterior with a"'chamber, said head having a fiat face, a plu-,

ralityf of; flat'disks cooperating with the flat face ofithe head and serving to close the chamber formed, in the latter, said disks being provided with, aligned openings in communication with said chamber, a perforated disk nozzle interposed between said disks, and providing a discharge openingthrough which theabrasive is adapted topass, said perforated disk nozzle being formed of high-resistance material, and means coop crating withsaid head for holding the closure disks in' engagement with the head, the relation of the 'clo'sur'ejdisksto said chamber causing the abrasive material to form itselfinto an "internal nozzle within the tubular holder and to locate the converging point beyond the discharge end of the nozzle.

ROY W. wEm.

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