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Патент USA US2039938

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May 5, 1936-'
E. w. SCHUL-rzVV
~ 2,039,938VV ,
SANDBLAST NOZZLE
Filed Dec. 225, 195531y`
Il',
Patented May 5, 1936
`
’ i
UNITED STATES PATENT OFFICE,
2,039,938
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
adapted to use a limited amount of air and sand
in conjunction with a predetermined amount of
Water or moisture whereby the sanding opera5'- tions may be accomplished in a minimum period
of time, wliile the objectionable hazard encoun-
tered in sand blasting operations will be materially reduced, if not entirely eliminated.
The invention has for its object the construcl0 tion wherein the sand will be broken up into finer
particles or grains and a proper mixing of the
moisture or water with said sand accomplished
before the sand is discharged.
Another object of my invention is to provide a,
i5 nozzle of the type in question wherein the wear
receiving portions of the discharge end or mouth
Of the nozzle are removably secured in place in
order that renewal or replacement of such parts
may be accomplished.
'20
The objects and advantages of my invention will
shown but which may be of the type shown in
my previous application referred to. The other
or discharge end of the casing is more or less
flattened out so as to provide the two tapering
sides Il, Il as shown in Figure 1, While the por- 5
tions intermediate of these tapering sides are
spread or built out laterally to provide the lat
erally disposed ear or wing portions I8, I8, see
Figure 3.
'I‘hat is to say, there are two wing portions I8 10
on each side which, at the end and for a short
distance removed from the end, are spaced from
each other to receive a pair of hardened steel
plates I9 0f predetermined Width and OÍ length t0
extend across the outlet of the nozzle to- form the _15
mouth or nozzle tip; and these plates are main
tained in spaced parallel relation with each other
by Suitable filter Plates 0r Spacers 20. The 60n
struction of these plates I9 and 20 is shown in de
tail in Figures 5 and 6.
be readily comprehended from the following detailed description of the embodiment disclosed in
the accompanying drawing, Wherein:--
The nller plates 2U, like plates I9, are oi
hardened steel; the Plates 20 being arranged in
termediate of the ends of the two plates IS at
l
Figure 1 is a side elevation of my improved noz25 zle with a portion of the side wall broken away to
opposite sides of the discharge end or mouth of
the nozzle and are comparatively narrow so as to
disclose interior construction.
20
5
provide an elongated substantially straight lined
Figure 2 is a longitudinal sectional view taken
Substantially 0n the line 2-2 0f Figure 1, aS
30 viewed by the arrows.
_
_
_Figure 3 1s an end elevation as Vlewcd from the
discharge end or mouth.
Figure 4 is a cross sectional view taken sub-
stantiallyon the line 4-4 of Figure 2, looking in
35 'ßhîTdlfeCtàOn 0f âhî alrfows- ï . _
f A
Í
narrow discharge opening 2l.
The outer ends of the wing portions I8, the
ends of the tip plates I9 and the spacer or ñller 3o
piates 2n are au apertured to receive bolts z2, se
that when the nuts 23 are screwed up on the
bolts 22 the ears or Wing portions will be drawn
into tight relation with the tip plates I9 and the
latter drawn into tighter relation with the nner 35
the lälslâharëea'enâ aglaïgsrssâghlî gâïi’oïl älfèîgn
plates
20; the ends of the tip plates I9 and of the
Y
spacer or filler plates 20 closing the spacing at the
aWFa‘iBg-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
The Specific embodiment of my invention’ as
ldisclosed 'in the drawing, involves certain im-
air or sand cannot find egress at the sides of the 40
nozzle'mouth'
_
provements on the type of sand blast nozzle disclosed in my copendmg application serial Num_
45 ber 19,371 anais espeeiaiiy adapted for send biesting surfaces where> scoring would be objeetionable and Where the element of time and material
In Order to enable a' p_l‘oper Shaping 0f the neZ
zle body and also provide access to the interior
dunne »constructiva the Opposite sides in align- 45
40 '
is 3,150 eSSentiaL
v
ment with the spacing between the ears I8 is slit
to receive the radially disposed webs 24 whose in
ner ends are intimately secured or welded to the
The body of the nozzle preferably consists of an
50 elongated and somewhat cylindrical casing I5
Of‘prearranged and convenient proportions and
reduced somewhat at one end to provide the tubular nipple or collar portion I6 which is preferably
internally threaded to receive the usual hose
Cellar 01’ Pipe Coupling member 25 arranged con
eentrieaiiy Within the tubular body |550
This coupling 25 is interiorly threaded to re
ceìve the externally threaded end 0f a Short pipe
or tubular member 26 and to maintain the latter
in concentric relation with the casing I5 and to
55 gripping bushingV and inlet nozzle which are >not
provide a comparatively large annular passage 55
2
2,039,938
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 pro
vided With a'hardened bronze covering, indicated
at 28, adapted to withstand greater wear; while
the short tubular member or nipple 26 is prefer
ably case hardened to withstand the action of the
incoming sand introduced through the nipple end
and a special ñne sand would have to be pre
pared; 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 ori
ñce and with my improved construction these
plates when worn can be readily removed and re
placed thus enhancing the life of the nozzle and
consequently materially reducing replacement
cost.
10
With the comparatively wide plates I9 the noz
I6 by means of a suitable nozzle asfor example zle is provided with a narrow straight throat or
shown in my co-pending application.
mouth which causes the sand to discharge in a
In operation the tubular member 26, Whose Y substantially straight line and withi a strong strik
15 open end is in alignment with the incoming sand
under pressure, is adapted to receive the sand
and to ñll up, thereby providing an impact re
ceiving pocket; the sand after overflowing being
forced around the tubular member 26 and past
20
the webs 24, toward the discharge end’ of the
nozzle.
1
With the plates I9 extending a distance into
the casingV I5 it is> apparent that a sand arrest
ing pocket is provided above the upper plate and
25 beneath the lower plate when the nozzle is posi
tioned as viewed in Figure 1.
These pockets at the discharge- end like the
concentric pocket 26 soon become ñlled 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
35 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 through
out the casing and- thus diminish its severity.
'I'he turbulent sand coming from the arresting
pocket 26 has a> tendency to followthe sloping
_
15
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 be
ing preferable to obtain the sand action within
the casing.
20
' VThe construction shown and described is be
lieved to be the best embodiment of my inven
tion, but modifications are possible and may be
made without departing from the spirit of my
invention.
25
What I claim is:
1. A sand blast nozzle vof the character de
scribed 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 30
being gradually reduced so as to taper on two
oppositev sides and to flare outwardly on. two op
posite sides and said flared sides slit for a prede
termined distance to provide a pair of laterally
disposed ears on both of said ñared sides; ilat 35
plates arranged in parallel spaced relation in
said slits transversely of the casing with ther ends
of said plates arranged between the ears and pro
viding a straight line discharge orifice; means
coaoting with said ears and with the ends of said 40
ñ'ce thereby'tending to somewhat further dimin
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 cas
ish'tlie‘striking force Aofthe discharging sand.
passing through the casing is produced.
wallsv of the casing and to set up somewhat of a
cross ñre a short distance fromV the discharge ori
45
ing force.l
` The casing YI5 at a point’ preferably coincident
with' an“ intermediate pa'rt of arresting pocket
' 26 is shown provided with' an L-n’ipple orv elbow
tube 29 which is preferably'welded into ahole
50 in the casing I‘5"by'means'of"bronze as`A at 30.
'As `is apparent', water may thus be admitted into
the casing l-5-at aVY point- intermediate 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 ñne sandpassing about the pocket 26,
Y The air and sandgin addition to entraining the
Y water tend to convert the water into a mist.
With a proper regulation of the ingoing sand a
60 lesser amount of sand may be used and the moist
ened'broke'n-up sand provides a somewhat faster
cutting action than when dry. Furthermore, the
water mist also eliminates the dust that other
would result during a dry sanding operation;
65 This also permits sanding operations to be per
formed within an enclosure. With my improved
nozzle, if it is Ydesired to vwash any parts or ‘objects
that-have been sanded, the inílowing sand stream
may be shutoff and merely the air and water
, allowed to enter thereby
spraying nozzle.
quickly providing a
'
.
It has been found in practice that the sand
ing whereby a turbulence in. the sand-stream
` 2". A sand blast nozzle of'the character de
scribed comprising a cylindricalcasing havingV a
sand- and'air inlet at one end and a discharge
at the opposite end, the discharge end being cól
lapsed to provide two gradually tapering walls 50
and outwardly ñared spaced apart portions be
tween the. tapered walls;` flat plates 'arranged in
parallel Vspaced relation b'et'v’ve'enV said- Vilared
spaced apartwall portions of the casing to' pro
vide a straight line discharge oriñce, said- plates 55
extending into the nozzleso as to provide Vsand
arresting pockets intermediate 'of the'pla‘tes 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 60
removably' securedv to the casing; `and means
concentri’cally arranged' in the casing interme
diate of its ends> and adapted to intercept the
incoming
sand.
'
~
~
3». A sand blast nozzle of the characterde 65
scribed 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 par
allel plates ati the discharge end of the casing
arranged toV provideY a narrow elongated outlet m
nozzle;~ means whereby said plates are remov
ably secured in place; a, sand arresting element
is broken up so iine that the nozzle may be used
for a great many purposes where the conven
located concentrically in the casing intermedi
tional method, of sanding wouldV be much slower
stream passing through the casing is provided
ate'of its ends _whereby a turbulence in the sand
2,039,938
and finer sand produced; and means whereby
water may be introduced into the casing beyond
the point of discharge of said sand arresting ele
ment.
4. A sand blast nozzle of the character de
scribed 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 dis
charge end tapering toward each other and pro
viding 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 ar
ranged 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 re
lation with the tapering sides of the casing to '
20
provide sand arresting cavities; ñller plates be
25
and the plates are drawn into snug relation.
5. A sand blast nozzle of the character de
tween the ends of the first mentioned plates to
maintain the latter in prearranged spaced rela
tion; and removable means whereby the wings
scribed 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
30 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
3
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 ex
tend 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 re
movably clamped between said wings; and 10
means whereby water may be introduced into
the casing intermediate of its ends.
6. A sand blast nozzle of the character de
scribed comprising an elongated casing provided
with an inlet at one end and a discharge at the 15
opposite- end and having two opposite tapering
sides terminating in a discharge opening coex
tensive with the diameter of the casing and hav
ing a pair of outwardly extending wings on each
side of the casing with a slot-way therebetween; 20
a pair of flat plates arranged in the discharge
opening with their ends disposed in the slot
ways between the plates; means coacting with
said wings and said plates for removably -clamp
ing the plates in place; a sand stream arresting
pocket substantially at the- longitudinal 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 open 30
ing of the casing.
FREDERICK W. SCHULTZ.
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