US2039938A

US2039938A - Sandblast nozzle

Info

Publication number: US2039938A
Application number: US55826A
Authority: US
Inventors: Frederick W Schultz
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-12-23
Filing date: 1935-12-23
Publication date: 1936-05-05
Anticipated expiration: 1953-05-05

Description

May 5, 1936-' E. w. SCHUL-rzVV 2,039,938VV SANDBLAST NOZZLE Filed Dec. 225, 195531y` Patented May 5, 1936 i UNITED STATES PATENT OFFICE,

SANDBLAST NOZZLE Frederick W. Schultz, Wichita, Kans.

Application December 23, 1935, Serial No. 55,826

6 Claims. (Cl. 51-11) My invention relates to a sand blast nozzle shown but which may be of the type shown in adapted to use a limited amount of air and sand my previous application referred to. The other in conjunction with a predetermined amount of or discharge end of the casing is more or less Water or moisture whereby the sanding operaflattened out so as to provide the two tapering 5'- tions may be accomplished in a minimum period sides Il, Il as shown in Figure 1, While the por- 5 of time, wliile the objectionable hazard encountions intermediate of these tapering sides are tered in sand blasting operations will be matespread or built out laterally to provide the latrially reduced, if not entirely eliminated. erally disposed ear or wing portions I8, I8, see

The invention has for its object the construc- Figure 3.

l tion wherein the sand will be broken up into finer 'Ihat is to say, there are two wing portions I8 10 particles or grains and a proper mixing of the on each side which, at the end and for a short moisture or water with said sand accomplished distance removed from the end, are spaced from before the sand is discharged. each other to receive a pair of hardened steel Another object of my invention is to provide a, plates I9 0f predetermined Width and O length t0 i nozzle of the type in question wherein the wear extend across the outlet of the nozzle toform the 15 receiving portions of the discharge end or mouth mouth or nozzle tip; and these plates are main- Of the nozzle are removably secured in place in tained in spaced parallel relation with each other order that renewal or replacement of such parts by Suitable filter Plates 0r Spacers 20. The 60nmay be accomplished. struction of these plates I9 and 20 is shown in de- '20 The objects and advantages of my invention will tail in Figures 5 and 6. 20 be readily comprehended from the following de- The nller plates 2U, like plates I9, are oi tailed description of the embodiment disclosed in hardened steel; the Plates being arranged inthe accompanying drawing, Wherein: termediate of the ends of the two plates IS at l Figure 1 is a side elevation of my improved nozopposite sides of the discharge end or mouth of zle with a portion of the side wall broken away to the nozzle and are comparatively narrow so as to 5 disclose interior construction. provide an elongated substantially straight lined Figure 2 is a longitudinal sectional view taken narrow discharge opening 2l. Substantially 0n the line 2-2 0f Figure 1, aS The outer ends of the wing portions I8, the

viewed by the arrows. ends of the tip plates I9 and the spacer or ller 3o Figure 3 1s an end elevation as Vlewcd from the piates 2n are au apertured to receive bolts z2, se discharge end or mouth. that when the nuts 23 are screwed up on the Figure 4 is a cross sectional view taken subbolts 22 the ears or Wing portions will be drawn stantiallyon the line 4-4 of Figure 2, looking in into tight relation with the tip plates I9 and the 'hTdlfeCtOn 0f h alrfowsf A latter drawn into tighter relation with the nner 35 the llslharea'en aglagsrssghl giol lfgn plates 20; the ends of the tip plates I9 and of the Y spacer or filler plates 20 closing the spacing at the aWFaiBg-ure 6 is a similar view of one of the filler or sides. of the discharge motlth of me nozzle inter' spacer p1ates mediate of the ears or wing portions .I8 so that 40 The Specific embodiment of my invention as air or sand cannot find egress at the sides of the 40 ldisclosed 'in the drawing, involves certain imnozzle'mouth' provements on the type of sand blast nozzle dis- In Order to enable a' p loper Shaping 0f the neZ- closed in my copendmg application serial Num zle body and also provide access to the interior ber 19,371 anais espeeiaiiy adapted for send biestdunne constructiva the Opposite sides in align- 45 ing surfaces where scoring would be objeetionment with the spacing between the ears I8 is slit able and Where the element of time and material to receive the radially disposed webs 24 whose inis 3,150 eSSentiaL v ner ends are intimately secured or welded to the The body of the nozzle preferably consists of an Cellar 01 Pipe Coupling member 25 arranged conelongated and somewhat cylindrical casing I5 eentrieaiiy Within the tubular body |5- 50 Ofprearranged and convenient proportions and This coupling 25 is interiorly threaded to rereduced somewhat at one end to provide the tubuceve the externally threaded end 0f a Short pipe lar nipple or collar portion I6 which is preferably or tubular member 26 and to maintain the latter internally threaded to receive the usual hose in concentric relation with the casing I5 and to gripping bushingV and inlet nozzle which are not provide a comparatively large annular passage 55 about the member 26, as clearly shown in Figures 2 and 4.

The opposite end of the co-upling is provided with a steel plug 21 which is tightly driven into Y,the coupling and welded in place and the forward or inner face of the plug 2l is preferably provided With a'hardened bronze covering, indicated at 28, adapted to withstand greater wear; while the short tubular member or nipple 26 is preferably case hardened to withstand the action of the incoming sand introduced through the nipple end I6 by means of a suitable nozzle asfor example shown in my co-pending application.

In operation the tubular member 26, Whose open end is in alignment with the incoming sandunder pressure, is adapted to receive the sand and to ll up, thereby providing an impact receiving pocket; the sand after overflowing being forced around the tubular member 26 and past the webs 24, toward the discharge end of the nozzle. 1

With the plates I9 extending a distance into the casingV I it is apparent that a sand arresting pocket is provided above the upper plate and beneath the lower plate when the nozzle is positioned as viewed in Figure 1.

These pockets at the dischargeend like the concentric pocket 26 soon become lled with sand thereby providing a striking bed for the incoming stream of sand to strike against. The incoming sand is introduced directly in line with the open end of the tubular member 26, causing the sand to more or lessY combat itself and to set up a vigorous action which causes the sand to break up into a very much finer state than when it entered the: nozzle. The turbulent action set up by the arresting pocket. member 26 ytends to choke the air and to distribute the sandV equally throughout the casing and thus diminish its severity. 'I'he turbulent sand coming from the arresting pocket 26 has a tendency to followthe sloping wallsv of the casing and to set up somewhat of a cross re a short distance fromV the discharge ori- 'ce thereby'tending to somewhat further diminish'tliestriking force Aofthe discharging sand. The casing YI5 at a point preferably coincident with' an intermediate pa'rt of arresting pocket 26 is shown provided with' an L-nipple orv elbow tube 29 which is preferably'welded into ahole in the casing I5"by'means'of"bronze as`A at 30. 'As `is apparent', water may thus be admitted into the casing l-5-at aVY pointintermediate of the ends of thearresting pocket-26 so that the water encounters the sand after its breaking-up.. action in pocket 2.6;.the water being made` to commingle with the ne sandpassing about the pocket 26,

Y The air and sandgin addition to entraining the Y water tend to convert the water into a mist.

, allowed to enter thereby With a proper regulation of the ingoing sand a lesser amount of sand may be used and the moistened'broke'n-up sand provides a somewhat faster cutting action than when dry. Furthermore, the water mist also eliminates the dust that otherwould result during a dry sanding operation; This also permits sanding operations to be performed within an enclosure. With my improved nozzle, if it is Ydesired to vwash any parts or objects that-have been sanded, the inlowing sand stream may be shutoff and merely the air and water quickly providing a spraying nozzle.

It has been found in practice that the sand is broken up so iine that the nozzle may be used for a great many purposes where the conventional method, of sanding wouldV be much slower and a special ne sand would have to be prepared; my improved nozzle making it possible to sand comparatively delicate surfaces.

In practice it is found that most of the wear is encountered by the plates at the discharge orice and with my improved construction these plates when worn can be readily removed and replaced thus enhancing the life of the nozzle and consequently materially reducing replacement cost.

With the comparatively wide plates I9 the nozzle is provided with a narrow straight throat or mouth which causes the sand to discharge in a Y substantially straight line and withi a strong striking force.l

It will be understood, of course, that the size of the discharge orifice may vary in keeping with the size of the main casing, a certain relation being preferable to obtain the sand action within the casing.

' VThe construction shown and described is believed to be the best embodiment of my invention, but modifications are possible and may be made without departing from the spirit of my invention.

What I claim is:

1. A sand blast nozzle vof the character described comprising an elongated casing having a sand and air inlet at one end and a discharge at the opposite end, the discharge end of the casing being gradually reduced so as to taper on two oppositev sides and to flare outwardly on. two opposite sides and said flared sides slit for a predetermined distance to provide a pair of laterally disposed ears on both of said ared sides; ilat plates arranged in parallel spaced relation in said slits transversely of the casing with ther ends of said plates arranged between the ears and providing a straight line discharge orifice; means coaoting with said ears and with the ends of said plates whereby the wall of the casing is drawn into snug relation with said plates and the latter removablyheld in place; and means in thev casing whereby a turbulence in. the sand-stream passing through the casing is produced. 2". A sand blast nozzle of'the character described comprising a cylindricalcasing havingV a sand and'air inlet at one end and a discharge at the opposite end, the discharge end being cllapsed to provide two gradually tapering walls and outwardly ared spaced apart portions between the. tapered walls;` flat plates 'arranged in parallel Vspaced relation b'et'vve'enV said Vilared spaced apartwall portions of the casing to' provide a straight line discharge orice, said plates extending into the nozzleso as to provide Vsand arresting pockets intermediate 'of the'plates and the sloping wall portions of the casing adapted to receive the sand in advance of its discharge; means whereby the plates are heldin place 'and removably' securedv to the casing; `and means concentrically arranged' in the casing intermediate of its ends and adapted to intercept the incoming sand.

3. A sand blast nozzle of the characterdescribed comprising a cylindrical casing with an air and sand inlet at one end land ay discharge at the opposite end; a pair of spaced apart parallel plates ati the discharge end of the casing arranged toV provideY a narrow elongated outlet nozzle;- means whereby said plates are removably secured in place; a, sand arresting element located concentrically in the casing intermediate'of its ends whereby a turbulence in the sandstream passing through the casing is provided and finer sand produced; and means whereby water may be introduced into the casing beyond the point of discharge of said sand arresting element.

4. A sand blast nozzle of the character described comprising a cylindrical casing having a sand and air inlet at one end and a discharge at the opposite end, two opposite sides at the discharge end tapering toward each other and providing a discharge opening coextensive with the internal diameter of the casing, while the other two opposite sides of the casing are slit and formed to provide a pair of spaced apart wings on each side of the casing; matching plates arranged in the discharge end of the casing with their ends disposed between the spaced wings on opposite sides of the casing while the portions of the plates within the casing are in spaced relation with the tapering sides of the casing to provide sand arresting cavities; ller plates between the ends of the first mentioned plates to maintain the latter in prearranged spaced relation; and removable means whereby the wings and the plates are drawn into snug relation.

5. A sand blast nozzle of the character described comprising a cylindrical casing having a sand and air inlet at one end and a discharge at the opposite end, two opposite sides of the casing tapering toward each other while the other two sides flare outwardly and are slit to provide spaced apart wings, the casing interior at the flared sides being formed' to provide a discharge passage coextensive with the normal internal diameter of the casing; a pair of plates arranged in the flared end of the casing with their ends disposed between the spaced apart wings while the main portions of the plates extend into the casing in spaced relation with the tapering sides of the casing to provide tapering cavities; means whereby the plates are held in prearranged spaced relation; means whereby the plates and said first mentioned means are removably clamped between said wings; and means whereby water may be introduced into the casing intermediate of its ends.

6. A sand blast nozzle of the character described comprising an elongated casing provided with an inlet at one end and a discharge at the oppositeend and having two opposite tapering sides terminating in a discharge opening coextensive with the diameter of the casing and having a pair of outwardly extending wings on each side of the casing with a slot-way therebetween; a pair of flat plates arranged in the discharge opening with their ends disposed in the slotways between the plates; means coacting with said wings and said plates for removably clamping the plates in place; a sand stream arresting pocket substantially at thelongitudinal center of the. casing intermediate of its ends; and means whereby water may be introduced in the casing at a point intermediate of the forward open end of said pocket and the discharge opening of the casing.

FREDERICK W. SCHULTZ.