US1073149A - Sand-blast apparatus. - Google Patents

Description

G. R. LAWRENCE.

SAND BLAST APPARATUS. Y

APPLIOTION FILED JAN. 17, 1912.

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clear, and exact description, reference being had to the accompanying drawings.

. varying conditions of use.

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spcification t Letters-retenu Patentedsept. 16, 19913 appuuationmeaznnuarji'a 1912. -`Ser1a1'1ro.c 71,7ee. .y Y 4 To all whom it may concern.'

Cleveland in'the county of Cuyahoga and State of hio, have'invented a certain new and useful Improvement in Sand-Blast Apparatus, of w ich the following is a full,

This invention relates to sand blast apparatus, and has for its general objects to provide an apparatus of this 'character that will give asteady flow or discharge of sand; that will be capable of effectively' regulating the How of air and sandthrough the dise charge nozzle; thatwill be extremely con-I venient in operation and relatively simple and inexpensive of production;

.A further object of the invention is to provide an improved form and construction of nozzle and improved means whereby the flow of sand may' be regulated in accordance with the grade of'sand used and other With the foregoing objects in view, the invention may be defined further as consistn ing ofthe combinations of elements em'- bodied in the claims-hereto annexed and illustrated in the. drawings forming a part hereof, wherein-'- y Figure '1 represents a sectional view of the hopper and portions of the sand and air conduits of my apparatus, Fig. 2.-a sectional detail corresponding to the line 2-2 of Fig. 1, looking in the direction of the arrows, Fig. S-detail viewpartly in section and partly. in elevation, of the' discharge e ds of the sand and air ducts, including tiie nozzle. Fig. 4-a sectionaldetail correspondln looking 1n 4.the direction of the arrows.

Describing by reference characters the` various parts illustrated herein, 1 denotes the hopper or sand receptacle, the same being of general frusto pyramidal shape and having at its lower end an 'extension 2, generally rectangular in section, provided with a round, closed bottom 3.

4 denotes a pipe section comprising part of the sand conduit, said section extending across the bottom extension 2. and prefer-I ably 'parallel -with and a short distance above the rounded 'bottom 3. -This pipe sec tion is provided with a thread' 5 having a pair of clamping nuts 6 thereomby means tothe line 4--4 of Fig. 3 and of which it is secured to the inner and outer surfaces of one of the end walls of the bottoni extension 2. The pipe section 4 is provided with e ort 7, which may be conveniently formed y cutting out a semi-cylindrr cal port-10h of said pipe section and so assemblmgthe parts that the port wil-l be directed downward, as shown-in Figs. l and 2. The port 'will A'preferably be located above the central portion of the bottom 'ex-A tensmn.` The end of the pipe sect-ion'4, oppositelthe nuts 6,*extendsthrough the other end wall ofthe'b'ottom-extension 2 a considerable dist-ance and is provided with an internal thread for the reception ofthe- 'reduced threaded end' 8 of a plug 9. The enlarged end of this plug is oi greater diameter than the pipe section 4 and is provided withan external thread for the reception of an internal thread provided inthe outer end of 'a sleeve 10. This sleeve projects through an aperture in the wallof the bot- 'tomextension Aopposite the nuts 6, the sleeve being mounted in a stuffing box 11 which rejects from the cooperating wall of the ot-tcm extension. An operatmg handle 12 is secured to the sleeve ina suitable manner for the' purpose of adjusting the sleeve along the pipe section 4, so as to control ther effect-ive area ofthe port 7-. The plug 9 is provided with a bore 13, and this bore is placed in communication with a 'vacuum gage 14 by means of apipe 15 threadedl into the outer end 'of the plug- The pipe section 4 is shown as threaded into an elbow" 16, from which there extends second pipesection 17 having an external thread 18 thereon. Secured to the end of the pip'e sectionl 17 is a hose or similar flexible pipe 19. This flexible' pipe may be of any desired length, according to the conditions of use. At its lower oi' discharge end it is connected to a. suitable metallic nozzle secs tions, 4, 17 and 19-.exteiids for the greater los las

part o f its length through the air supply conduit, the following construction bem employed for this purpose. 24 denotes a. having a connection 25 into which the air 5 supply pipe 26 is threaded, said pipe being provided with a valve 27. One end of the T is closed by means of a plug 28, which is threaded into said Ty and has a threaded bore by means of which it and the T are connected with the pipe section 17. In the end o'f the T opposite the plug threaded a bushing 29, and to this bushing there is secured the hose or similar flexible pipe 30 which surrounds the pipe 19 and forms therewith an annular passageway for the air discharged into the v'" In the lower or discharge end of the pipe 30 there is mounteda nozzle section 31, thel parts being `so arranged that said Section shall surround the nozzle section 20, the latter section being mounted and centered within the section 31 by having the portion 23 thereof threaded into the bore of a spider 32 carried by the inner end of the nozzle section 31 and preferably formed therewith. The forward or discharge end of the nozzle section 31 is provided with an inwardly'directed flange having an `internally threaded at its inner end with an Voutwardly tapering seat 34, merging with a shoulder 35, which shoulder forms an abutment for a bushing 36, which may be slipped or driven into the bore of the section 33, the parts being so proportioned that when the bushing is so inserted its bore will form in effect a continuation of the enlarged end of the seat 34. The bushing may be conveniently retained in place by means of a set screw 37 and is made of specially hardened steel tol enable it to withstand the action of the sand.

With the parts constructed and arranged las described, the operation will be as followsrrThe sleeve 10 will be adjusted vby the handle 12 to regulate the eiective size of the port 7 in connection with the grade of sand used. As is well known, the finer the sand the less air will be required to feed it to the point of use. Air will be turned into its conduit by operating the valve 27 and will i'low around the sand conduit, through the ports 38 in the spider 32, around the nozzle section 20 and through the section `33, thereby creating a suction upon the former nozzle section, which section will draw the sand from the hopper through its conduit. It will be observed that ample clearance is provided between the sand and air conduits to accommodate the full capacity of the pipe 26. The ports 38 will also be of suiicient area not to ymateriallyv reduce or interfere with the flow of air-to a5 the nozzle section 33. By .this arrangement,

.will be no eed of sand by gravity from the 28 there is.

bore for the reception of a nozzle section 33, the last mentioned section being provided there will be practically nofrctional resistance to the flow of air through its conduit to the entrance of the discharge nozzle sec. tion 33. By adjusting the nozzle section 33 toward and from the section 20 the iow of air, and consequently the iow of sand, may

be ad'usted simultaneously in accordance with t e conditions of use.

In the` a paratus d1sclose`d herein, there hopper, since the sand isobliged to move laterally through the hopper intol the conduit section 4 and sincesuch movement cannot occur through the gravity of sand,

the sand not being suiiiciently iiuid to per-4 80 mit this movement. The gage 14 indicates to the operator the amountof. vacuum that g j is being 'produced in the sand conduit and' hopper. Any sudden diminution in this vacuum indicates leakage in the air or sand conduit or the necessity for filling the hopper.- Should it be necessary to cut oil the blast, this can be accomplished by bringing the valve seat 34 in contact with the tapered end of the nozzle section 2() which results in cutting oi the flow of air and thus the low of sand.

Having thus described my invention, what` I claim is:

1. In a sand' blast apparatus, the combination of a receptacle, a conduit for sand having a pipe' section. extending into said receptacle above thebottom and provided with a downwardly directed port, a sleeve surrounding the said pipe4 section and ad- 100 justable thereon to vary the effective area of said port, a. iuid pressure supply conduit surrounding the discharge end of the sand conduit, and means for regulating the low of air"through the latter conduit'.

2. In a sand blast apparatus, the combination of a sand receptacle,a sand conduit comprising a pipe section extending through the opposite walls of said receptacle above the bottom thereof and provided with a port 110 in its lower surface, a sleeve adjustably mounted on the end of said pipel section and projecting into the receptac e and arranged to control the effective area of said port, a

vfluid pressure supply conduit arranged to discharge past the discharge end of the for` mer conduit to create a suction therein, and means for controlling the iiow of the iuid through its conduit.

v3. In a sand last apparatus, the combi- 12o nation of a receptacle, a pipe section extending across t-he receptacle and having 'a port in its lowerl surface above the bottom of such receptacle, a plug for the end of said section, asleeve adjustably mounted on said plug and surrounding said c'onduit sectionl and adapted to overlap the port thereof, a nozzle section with which the sand conduit communicates, and a uid pressure supply pipe communicating with 130 connecting Atherewith and comprising a"- leXible pipe having at its discharge end a nozzle section provided with an annular seat surrounding its mouth, a pressure fluid conduit having a nozzle' section surrounding the former nozzle section and provided with an interiorly cylindrical elongated discharge passageway common to both conduits, said last mentioned section being substantially coaxial with said first mentioned nozzle section and 'being adjustably mounted with respect thereto, the diameterof said discharge passageway being not materially less than that of said first nozzle section and said second nozzle section having a seat g surrounding said passageway and adapted to coperate with said rst seating portion whereby the flow of pressure luid may be regulated.

5. In a sand blast apparatus, t-he combination of a fluid pressuresupply conduit having at its discharge end a sleeve providedwith an apertured spider, said sleeve having an internally threaded bore, a discharge nozzle section threaded into said bore and having at its inner end a valve seat, and a sand conduit having a nozzle 'section threaded into said spider and having a valve coperating with said seat.

6. In a sand blast apparatus, the combination of a Huid pressure supply conduit having at its discharge end a sleeve provided with an internal spider and with an inwardly directed flange spaced from said spider, said flange and spider each being provided with a threaded bore, a discharge nozzle section threaded into a bore of said flange, a sand nozzle adjustably threaded in Asaid spider, a sand conduit secured `to said nozzle, and a removable liner secured insaid discharge nozzle section.

7. In a sand blast apparatus, the combination of a discharge nozzle comprising sleevehaving threaded into its outer end a nozzle sect-ion, said nozzle section having at its inner or receiving end a beveled seat having a shoulder at the outer and smaller end of said seat, a bushing removably fitted in saidnozzle section and adapted to abut against said shoulder, and a sand conduit having a nozzle section coperating with the seat on the iirst-mentionedlsection.

8. In a sand blast apparatus, the combination, with a conduit for sand and a nozzle carried by said conduit, of a second nozzle surrounding said first nozzle and spaced therefrom to define an annular` passageway, a pressure Huid conduit connected to said second nozzle and communicating with said annular passageway, a hollow cylindrical vdischarge section carried by said second nozzle forward of and in alinement with said first nozzle and a cylindrical hardened steel bushing removably secured within said discharge section.

In testimony whereof, I hereunto aiiix my signature in the presence of two witnesses.

GEORGE R. LAWRENCE.

J. B. IIULL, BRENNAN B. Wns'r.

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