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Патент USA US3069822

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Dec. 25, 1962
Filed Aug. 8, 1960
2 Sheets-Sheet 1
, J20‘
Dec. 25, 1962
Filed Aug. 8, 1960
2 Sheets-Sheet 2
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nited rates at
George D. Shelton V, 4455 4th St, Riverside, Calif.
Filed Aug. 8, 1966, Ser. No. 48,153
1 Claim. (Cl. 51-41)
" lice
Patented Dec. 25, 1962
Cylinder 11 has three sets of forwardly inclined holes,
13, 19, and 20, at spaced distances about its circum
ference, and extending through its walls. Cylinder 1.1 is,
likewise, provided with two sets of diametrically opposed
holes 21 at its discharge end.
Collar 12 is provided with threads 12:: to engage
threads of sleeve 10. Gasket material 22, 22a and 23
forms tight seals so that an air chamber Ida is formed
ment and more particularly to a new and improved sand
about the outer circumference of cylinder 11, as shown.
blasting nozzle.
Sleeve it) has a handle so formed integrally, welded,
Sand blasting, widely used for surface preparation and 10
or otherwise making a solid and air tight connection.
for surface abrasion, utilizes sand, steel grit, or other
Handle 39 is bored 34 through its length and into com
abrasive particles impinged at high speed against the sur
munication with chamber Illa.
face being treated. Customarily, the supply of abrasive
A series of holes 18 (four are used here, but any other
particles is fed through a hose to a hardened steel nozzle
which has a constriction in its bore. The constriction, 15 convenient number might be used) are provided through
the wall of cylinder 11, and at uniform distances about
causes the abrasive particles, under high pressure, to be
its circumference inclined forwardly, and communicat~
expelled with force and accelerated so as to impinge upon
ing between the bore of cylinder 11 and air chamber 16m
the surface being abraded.
A similar series of holes 19, and another similar series of
Because of the constriction in the nozzle, and the
abrasive force of the particles, these nozzles have very 20 holes 24} are provided at spaced intervals as indicated.
A valve 33 of any customary air valve construction op
short useful lives and must be replaced frequently at
enated by ?nger button 32 controls the flow of air into air
relatively high cost.
chamber Ida and thus the ?ow of air through holes 18,
I have devised an important new and improved sand
1% and 20.
blasting nozzle utilizing air injection to accelerate the
This invention relates generally to sand blasting equip
With this nozzle I am able to eliminate the 25
usual constriction in the nozzle and, yet, provide better
surface abrasion.
The wear on the interior of this new
type nozzle is greatly reduced.
Thus, it is an important object of this invention to pro
vide a sand blasting nozzle utilizing air injection to ac~
celerate the abrasive particles.
The two additional groups of holes 21 provided on
opposite sides of the discharge end of cylinder 11 inter
communicate with air chamber 10a through the cham
fered portions 24- of control ring 17.
Control ring 17 is held in position by screws 14 and
125 through sleeve It}. Front ring 17 may be rotated so
that the chamfered portion 24 allows air to pass to holes
It is a further object of this invention to provide an
21, or it may be rotated so as to shut off the air from all
improved sand blasting nozzle in which the abrasion on
the interior of the nozzle is reduced.
or any portion of the holes 21, always so moving that if
any holes are open a uniform number of diametrically
It is a further object of this invention to provide an 35 opposed holes will be open on each side.
Set screws 14 are loosened or fastened through holes
improved sand blasting nozzle in which the abrasive par~
ticles are provided with increased velocity and increased
The foregoing and other objects and advantages of this
(unnumbered) in knurled ring 13. When set screws 14
are loosened ring ‘17 is shifted relative to cylinder 11 by
turning the knurled ring 13. Set screws ‘Ila slide in slots
invention will be clear to those skilled in the art upon 40 14a in sleeve ltl. In position 24a as shown in FIGURE 4
air will pass through all of holes 21 and in position 24b
reading the following description in conjunction with the
accompanying drawings in which:
as shown in FIGURE 4 no air will pass through holes 21.
When the rings 13 and 17 are in the appropriate position
FIGURE 1 is a side elevation of a preferred embodi
for the operation desired, set screws 14 are tightened.
ment of a sand blasting nozzle of my invention;
FIGURE 2 is an enlarged front view of the same em 45 Thus it may be set so none of the holes 21 are open,
bodiment with the handle partly broken away;
or so that 1 or more of the holes on each side are opened.
FIGURE 3 is a section on 3-—3 of FIGURE 2;
FIGURE 4 is a section on 4-4. of vFIGURE 3, taken
as though FIGURE 3 was not itself in section;
opposed sides of the discharge opening so that the spray
The purpose of holes 21 is to allow air to pass on
of abrasive particles may be fanned if desired. When no
FIGURE 5 is a section on 5-5 of FIGURE 4 on a 50 holes 21 are open, there will be a spot of abrasive par
portion of the nozzle taken as though FIGURE 4, itself,
ticles being generally circular in pattern. As more of the
holes 21 are opened, this spot becomes oblong. Thus, the
FIGURE 6 is a section on 6--—@ of FIGURE 3 on a
width of the area being abraded may be controlled.
portion taken as though FIGURE 3 was not in section;
The acceleration air through holes 13, 19 and 2% speeds
55 the particles through the nozzle, at the same time pro
FIGURE 7 is a perspective of part number 17; and
FIGURE 8 is a partial section of the upper front as
viding a laminar flow of air such that there is little or
seen in FIGURE 3 but in alternative form with air holes
no contact of particles with the interior surface of the
l8, l9 and 20 of different sizes as explained in the descrip
To achieve different speeds and discharge of abrasive
The nozzle consists of a cylinder it having a bore (un 60 particles, all of the holes l8, l9 and 2d may be the same
size, or the rearward holes 24} may be larger, forward
numbered) throughout its length. Said bore is of a
diameter equal to the internal diameter of the particle
holes 1% smaller, and intermediate holes 19 of inter
supply hose 4% being used in the operation. In various
mediate size as shown in FIGURE 8; or, this may be
reversed so that holes 18 are largest, 19‘ intermediate and
circumstances this might be one half inch diameter, one
was not in section;
inch diameter, or any other size as will be clear to 65 2d smallest as shown in FIGURE 3.
In operation, a sand blast hose coupling is screwed
those skilled in the art.
onto the thread ‘11a of the nozzle body. A source of
The cylinder 11 is provided with threads 11a at one
air under pressure is supplied through hose 36 so that
end to accommodate the threads 41a on the hose cou
the chamber ‘19a between the sleeve 10 and the wall of
pling 41.
the nozzle 11 becomes an air chamber under pressure.
Cylinder I1 is provided with a shoulder (unnumbered)
Air then ?ows through the small holes 18, 19 and 20.
near its threaded end suitable to accommodate collar 12.
The successive series of holes within the tube discharge
the air at high velocity into the nozzle. Since the holes
18, 19 and 20 are inclined towards the discharge end, a
laminar ?ow of air is created within the tube. The air in
the center of the tube ?ows more rapidly than the air
near the walls of the tube. This principle will be under
stood by those who have studied air current, particularly
jets meeting under pressure in a con?ned area and flowing
in a lateral direction.
in the art that the result desired might be obtained by a
greater or lesser number series of a lesser or greater
number of holes spaced about the circumference and
the holes could be so distanced that they were not exactly
in alignment from the end or either end of the nozzle.
All of such modi?cations as might be made will be clear
and apparent to those skilled in the art.
I claim:
A sand blasting nozzle comprising: A ?rst tube having
When air ?ows through the holes 21 at two diametri 10 an intake opening at one end and .a discharge opening
cally opposed sides or" the discharge and of the nozzle
at the other end, a plurality of holes through its walls
a fan-like effect is created and causes the particles emanat
inclined to outside to inside in the direction of the dis
ing from the nozzle to be spread in a fan-like pattern in
charge opening and two sets of diametrically opposed
order to broaden the area of coverage upon the surface
holes at the discharge end extending through the walls
being sand blasted. As previously described, the control
of said tube and inclined from the outside to the inside
ring 17 may be shifted to open or close as many of holes
of said tube directionally outward from the discharge
21 as desired. Depending upon the surface being Worked
end; a second tube having a hole through its Wall fastened
and the results desired, this pattern may be altered.
about said ?rst tube at a distance therefrom so as to form
In operation, the source of sand is delivered in the cus
tomary manner through a suitable hose 40‘ connected
to the sand blast nozzle. The air source is supplied to
the chamber around the sand blast nozzle and feeds
through the holes l8, l9 and 2t} into the nozzle and out
ward and emanating from the end of the nozzle.
a chamber about said ?rst tube; an air supply hose con
the nozzle, it is picked up in the air ?ow and because of
said chamber, or cut them oil from such communication;
and a supply ‘for abrasive particles attached to the intake
opening of said ?rst tube.
nected to and communicating with said hole in the wall
of said second tube; a rotatable ring located within said
chamber at the discharge end, having a portion of its
circumference cut away so that on rotation it may open
As the source of sand or other abrasive material enters 25 said diametrically opposed holes to communication with
the laminar ?ow is con?ned to the center of the nozzle
and thus does not create a bad abrasion against the sides
of the nozzle.
By the injection of the air stream, the
particles are greatly accelerated in speed in a manner 30
comparable to, but superior to, that created by the me
chanical ‘constriction in a normal sand blast nozzle.
the abrasive material emanates from the discharge end,
it is fanned by the air from the holes in the discharge
end as desirable for the particular operation.
In the particular device shown, I have used three series
of four holes about the circumference of the nozzle
Within the air chamber. It will be clear to those skilled
References Cited in the ?le of this patent
Oechsle ______________ __ May 22, 1945
Hale ________________ __ Oct. 16, 1951
Fisher _______________ __ Jan. 28, 1958
Browning _____________ __ July 4, 19611
France _______________ __ July 16, 1923
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