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Патент USA US3074660

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Jan. 22, 1963
Filed Feb. 26, 1959
2 Sheets-Sheet 1
United States Patent 0‘ rice
Patented Jan. 22, 1963
the inner shield. A lever ?xed to the outer shield pro
jects outwardly through a slot in the housing and is ac
Joseph S. Kanarek, Lombard, Ill., assignor, by mesue as
signments, to Ziif-Davis Publishing Company, New
York, N .Y., a corporation of Delaware
Filed Feb. 26, 1959, Ser. No. 795,650
1 Claim. (Cl. 239-—215)
cessible for manually rotating the outer shield to vary
the length of the discharge outlet formed by the por
tions of the openings in the two shields in registration
with each other.
The maximum length of the discharge outlet is limited
to the size of the openings in the skirts of the shields,
which, in this embodiment is about one-fourth the cir
This invention relates to a spraying mechanism and
cumference of the skirts, respectively. Thus, in this em
more particularly to a rotary mechanism adapted to at 10
bodiment of the invention, approximately seventy-?ve
tenuate liquids, such as paint and the like, and to dis
percent of the paint passing across the outer edge of the
charge the attenuated liquid therefrom.
inverted cone strikes the inner surface of the inner shield,
Spraying mechanisms embodying the present invention
and a small additional portion of the paint may strike the
are of general utility and may have any desired form
inner surface of the portion of the outer skirt which
and shape. An illustrative embodiment of the present
may overlap the opening in the inner skirt such as when
invention is in the form of a “spray gun” having a pistol
the openings in the two skirts are not in complete reg
like grip or handle. The spray gun form of the invention
is described below in conjunction with the accompanying
The skirts of the shields in addition to controlling the
drawings as an illustrative embodiment of the invention.
magnitude of the discharge from the spray gun, also
Also, the spray gun will be described with reference to
are effective to redirect the excess paint issuing from the
its use for spraying paint, although it may be used with
attenuator, toward the bottom of the upper chamber for
any suitable liquid.
return through the communication openings to the can.
The spray gun has a lower chamber or can for holding
For this purpose at least the upper portions of the skirts
the paint. A conveyor in the form of a feed screw or
are formed as substantially 45° cones and are radially
screw conveyor feeds the paint upwardly from the lower
aligned with the outer edge portion of the attenuator so
chamber to an upper chamber and an attenuator, which
that excess paint issuing from the attenuator will strike
in this embodiment of the invention is a smooth surfaced
the conical surfaces and be redirected as described.
inverted cone, is rotatably mounted in an upper chamber
Some of the excess paint may ?nd its way onto the
and receives the paint fed upwardly by the screw con
top and edge of the cover plate or disk. To prevent this
veyor. A motor mounted in the mechanism rotates the
portion of the excess from interferring with the spray pat
screw conveyor for feeding paint and rotates the inverted
tern, the inner shield is provided with a doctoring blade
cone to attenuate the paint. An adjustable shield controls
having an edge closely adjacent the top surface and to
the outlet through which the attenuated paint is dis
the edge of the cover plate. The plate rotates with the
inverted cone, and the doctoring blade scrapes the paint
The inverted cone attenuator has a substantially ?at 35 from the top of the plate and directs it to another doctor
outer peripheral edge portion" across which attenuated
and ?lmed paint is discharged as a ?nely ?lmed spray sub
ing blade which extends below the upper edge of the in
verted cone and removes excess paint from the edges of
the attenuator and the disk cover plate. The paint re
the attenuator.
40 moved in this manner then ?ows back into the lower
The feed screw conveyor is threaded into the drive
chamber along with the rest of the excess paint.
shaft of the motor and is mounted in an open ended feed
The structure by means of which the above-mentioned
stantially in the ?at plane of the?outer edge portion of
tube having a resilient, ?at valve plate positioned adjacent
the lower end of the tube. The plate operates as a valve
to regulate the ?ow of paint to the conveyor.
and other advantages of the invention are attained will
be described in the following speci?cation, taken in con
junction with the accompanying drawings forming a part
A ?at disk, which may have a diameter substantially 45 of this speci?cation, showing a preferred illustrative em
equal to or slightly larger than the diameter of the open
bodiment of the invention, in which like reference nu
top of the inverted cone attenuator, is spaced a short
merals refer to likeparts and in which:
distanceabove the open top of the attenuator to cover
FIGURE 1 is a front elevational view of a spray gun
the inverted cone attenuator to prevent excess discharged
embodying the invention;
paint expelled from the spraying mechanism as a whole, 50
FIGURE 2 is a side elevational view of the spray gun;
from rebounding or otherwise re-entering the attenuator
‘FIGURE 3 is a fragmentary vertical view, partly in
. from the;top. vThis prevents such excess paint from dis
elevation and partly in section, showing the interior con
turbing the‘?lming-out and attenuating action of the
By this means a smooth and uniform spray
struction of the spray gun;
FIGURE 4 is a fragmentary vertical sectional view,
is obtained without interference from excess discharge 55 showing the screw conveyor for feeding the paint into
., from the attenuator and Without spattering or other irregu
the inverted cone; and
laritie's in the spray pattern.
FIGURE 5 is a detail perspective view of the inverted
The excess paint discharged from the attenuator is re
directed and fed back to the lower chamber or paint
Referring to the drawings, the reference numeral 2
can through communication openings from the upper
indicates a motor housing in which is mounted a motor
chamber, for reuse.
(not shown) having a drive shaft 3 (FIGURE 4) de
In addition to the valve assembly on the feed tube,
pending therefrom. A hollow handle 4, ?xed to housing
the magnitude of the discharge from the spray gun, and
2 in any suitable manner forms a conduit for electrical
the width of the spray pattern are controlled by a shield
65 wiring 5 for connecting the motor to an electric current
arrangement on the spray gun. An inner shield ?xed to the
source. A switch (not shown) is mounted on the handle
top of the upper chamber has a skirt depending below
for controlling operation of the motor. A barrel 6 hav
the space between the open top of the inverted cone and
a cylindrical wall 7 is secured to the underside of
the ?at disk. A portion of the skirt, however, is cut away
housing 2 by a plurality of screws 8 (FIGURE 3). Barrel
to provide part of a discharge outlet. An outer shield
or gate is rotatably mounted between the inner shield and 70 6 has a lower transverse wall 9 provided with a plurality
of liquid return apertures 10; and a skirt 11 depends
the top of the upper chamber, and has a depending skirt
substantially of the same size and shape as the skirt of from. thecylindrical wall 7 below the transverse .wall 9.
angle of extension 41 enables the resilience of the metal
of which plate 43 is formed to move the plate toward
A container or can engaging external thread 12 extends
around the external circumferential face of the skirt 11.
Barrel 6 has an open top and ?ts against the bottom
wall 2' of housing 2 to form an upper chamber '13.
The upper end of a central tubular hub 14 ?xed to
transverse 'wall 9 extends into chamber 13, and its lower
the bottom of tube 39 as screw 17 is threaded outwardly
relative to tube 15. Thus, the plate 43 acts as a ?ap
valve for the open end of tube 39, and the distance be
tween plate 43 and the bottom of tube 39 controls the
end extends below the lower edge of the cylindrical skirt
11 on 'the barrel 6. An integral arm 15 extending up
wardly at a slight angle from hub 14 to cylindrical wall
amount of paint that is permitted to flow from the can
37 into the tube 39.
Boss 27 extends slightly above the plane of the upper
7 is provided with an axial recess in threaded to receive 10 end of inverted cone 25, and a disk-shaped ‘cover plate
45, apertured to?t around drive shaft 3, is seated on the
a valve control screw 17 having a conical end 18. An
top of the boss. Plate 46 is held in position by a sleeve
‘aperture 19 extends through the lower wall of arm 15
47 and a plurality of washers 48 which are mounted on
adjacent to the inner end of recess 16.
the drive shaft above the disk. The diameter of the
The inner surface of hub 14 is threaded to receive a
plate 46 may be substantially equal to or slightly greater
‘tubular sleeve 20 which extends below the lower edge
than the diameter of the upper end of inverted cone
of hub 14, and a lock nut 21 is threaded on the lower end
25 and is spaced therefrom to provide a continuous open
1of the sleeve to hold the hub and sleeve against accidental
ing 49 between the upper end of the inverted cone and
separation. The upper end of sleeve 26 is recessed on
the disk throughout the circumference thereof, for flow
its outer surface, as indicated at 22, and the upper end
of hub 14 is recessed on its inner surface, as indicated at 20 of attenuated paint across the llat outer edge portion 25'
of the attenuator.
23, to form an annular space 24 between the upper end
An inner shield 50' is rigidly secured to the bottom of
of sleeve 2%} and the upper end of hub 14. An attenuator
motor housing'2 by screws 51 and has an annular skirt
in the form of an inverted cone 25 disposed within the
52 depending into upper chamber 13 below opening 49.
chamber formed by the barrel ‘6 and the transverse wall
2’ of the housing 2, is provided with a depending cylin~ 25 An outer shield 53 is rotatably mounted between inner
shield 56 and the bottom of motor housing 2. Shield
drical ?ange 26 ?tting loosely in space 24. A washer
53 has a depending skirt 54 of approximately the same
26' or other form of seal is provided between the upper
size and shape as skirt 52. A ?nger operated lever 55
22d of the sleeve 20' and the lower end of the attenuator
secured to outer shield 53 "projects through a slot 56 in
A vertical boss 27 extending upwardly from the apex 30 housing ‘2. Lever 55 may be manually manipulated to
rotate outer shield 53.
‘region of the cone 25 is provided with an axial bore 28
Each of skirts 52 and 54 has an opening which in this
counterbored ‘from the lower end, as indicated at .29, to
embodiment of the invention is approximately one-fourth
form a shoulder 36. The outer surface of boss 27 is
provided with a plurality of external reinforcing ribs 31
of the circumference of the ‘skirts to provide openings 57
of apertures 32 which terminate substantially flush with
opening 58 coincide with opening 57, the discharge out
let, which comprises the portions of openings 57 and 58
and the lower end of boss 27 is provided with a plurality 35 and 58, respectively. When lever 55 is positioned to make
annular shoulder 30.
The lower end or" drive shaft 3‘ has an axial bore 33
that are in registration with each other, has a length equal
to about one-fourth of the circumference of either skirt,
threaded to receive a screw 34 rigidly secured to the upper
40 which is the maximum length of the discharge outlet. As
end of a screw ‘conveyor 35. Screw 34 has an annular
?ange 36 abutting the upper end of screw conveyor 35.
Flange 36 ?ts within counterbored portion 29 of boss 27
and engages shoulder 30 to support inverted cone 25.
lever 55 is moved from said position, the length of the
discharge outlet is gradually reduced by movement of
lever 55 in the same direction, until the. discharge outlet
is closed by the continued rotation of outer shield 53 un
til opening 58 is completely out of registration with open
upper endof sleeve 20 or on the bottom of space 24.
ing 57.
Screw 35 may be of any suitable material, but is prefer
If desired, the inverted cone may be supported on the
The skirts 52 and 54 of the shields 50 and 53, in addi
ably made of nylon which ‘is inert and noncontaminating
tion to controlling the magnitude of the discharge from
to liquids to be conveyed thereby. The screw 35 extends
the spray gun, also are effective to redirect the excess
to a point spaced a short distance above the bottom of
‘a can 37 or other receptacle which comprises the lower 50 paint issuing from the attenuator, toward the bottom 2'
of ‘the upper chamber 13‘ for return through the com
chamber of the spray gun. Can 37 is provided with a
munication openings 10 to the can 37. For this purpose
wide month which is threaded, as indicated at 38, to
at least the upper portions 52’ and 54' of the skirts 52
‘engage thread 12 of the skirt 11 on the barrel 6 so that
and 54 are formed as substantially 45° cones and are ra
it may be easily attached to and removed from ‘the spray
.gun, for cleaning or ?lling. The can has no opening 55 dially aligned with the outer edge portion 25' of the at
tenu'ator 25 so that excess paint issuing from the attenu
‘except its mouth, and completely encloses the lower por
ator will strike the conical surfaces 52’ and 54’ and be
tion of the spray gun.
redirected as described.
A tube 3% is drive ?tted into the lower end of sleeve
In the‘ operation of the spray ‘gun the screw 35 is ro
20 and cooperates therewith to provide an open ended
housing for screw 35. The lower end of tube 39 extends 60 tated counter-clockwise, as viewed in FIGURE 4. This
direction of rotation of the screw causes the groove 59 to
a short distance below the bottom of screw 35. A split,
move the paint in the groove upwardly until it reaches the
metal clamp 40 extends around tube 39 above its lower
top of the screw. The paint then ?ows through openings
end. The clamp is held against the tube with su?icient
32 and is attenuated, ?lmed-out and spreads outwardly on
friction to prevent relative movement therebetween.
Clamp 40 has an integral extension 41 extending down 65 the surface of the rotating inverted cone. The paint
moves upwardly on the surface of the cone and is ?lmed
wardly and outwardly relative to tube 39. Extension 41
out and increasingly attenuated until it moves outwardly
is bent, as indicated at 42, to provide a resilient, ?at, valve
across or over the ?at peripheral edge region 25' of the
plate 43 extending across the open bottom of tube 39.
cone attenuator 25. The distribution of the paint around
A rigid, valve operating rod 44 has one end secured to
the free end of the plate 43 and the other end 45 of the 70 the circumference of attenuator 25 is substantially uni
form, and the paint is centrifugally sprayed across the
rod 44 projects through aperture ‘19 into tube 15.
edge portion 25’ as a ?nely ?lmed spray.
.As the screw 17 is threaded into tube 15 the ‘conical
The paint that impinges on the conical portions 52'
end 18 of the screw engages the end 45 of rod 44 and
and 54' of the shields 50 and 53‘ is directed thereby to
forces the rod downwardly, thereby moving the resilient
valve plate 43 away from the bottom vof tube 39, The 75 flow through apertures 10 into the “lower chamber. Inner
shield 50 is provided with doctoring blades 60 and 61 that
have edges arranged radially and axially of the plate 46 so
close to its upper surface and edge, respectively, that they
scrape excess paint therefrom as the plate is rotated.
Blade 60 terminates adjacent to blade 61 that extends
the invention. Accordingly, I do not desire to be re
stricted to the exact construction described.
I claim:
In a spraying mechanism, a lower chamber for contain
ing a liquid to be dispensed, an upper chamber having a
downwardly past the outer upper edges of the plate 46
discharge outlet, a tube extending from said upper cham
and the inverted cone 25 to remove excess paint there
her to said lower chamber, a rotatably mounted screw
from and guide the paint downwardly into upper chamber
13, from which it flows through apertures 10 along with
said lower chamber to said upper chamber, a resilient
conveyor extending through said tube to carry liquid from
the excess paint from the inner surface of the skirts. Paint 10 cover plate secured by a spring extension thereof and posi
tioned against the open lower end of said tube to regulate
chamber from which it is again fed by screw conveyor 35.
the ?ow of liquid into said tube, a rod secured to said
The size of the pattern of paint sprayed may be regu
cover, and means accessible from outside said lower
lated by adjusting the length of the discharge outlet. This
chamber and engageable with said rod for moving said
is done by rotating outer shield 53 by means of lever 55. 15 cover extension away from the lower end of said tube,
The amount of paint sprayed is a?ected by two factors,
the resiliency of said cover moving it toward the lower
namely the distance between plate 43 and the bottom of
end of said tube when pressure against said rod is re
tube 39, and by the speed of the motor. Paint may be
passing through apertures 10 falls directly into the lower
sprayed from the gun continuously until the lower cham
her is substantially empty, because the paint from the 20
lower chamber will be fed upwardly into inverted cone
25 as long as there is enough paint in the lower chamber
to be engaged by screw 35.
Although I have described a preferred embodiment of
the invention in considerable detail, it will be understood 25
that the description thereof is intended to be illustrative,
rather than restrictive, as many details may be modi?ed
or changed without departing from the spirit or scope of
References Cited in the ?le of this patent
St. Onge _____________ __ Dec. 10,
Norris _______________ __ Dec. 15,
Norris ______________ __ July 13,
Almquist ____________ __ June 15,
Waldrum ___________ _- May 26,
Patent No. 3,074,650
January 22, 1963
Joseph S. Kanarek
It is hereby certified that error appears in the above numbered pat
ent requiring correction and that th e said Letters Patent should read as
Column 6, _line- 15', strike out "extension"; line 16,
after "cover"
—— extension ——.
Signed and sealed this 20th day of August 1963.‘
xttesting Officer
Commissioner of Patents
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