U.S. patent number 3,915,382 [Application Number 05/464,992] was granted by the patent office on 1975-10-28 for extension spray gun.
Invention is credited to J. C. Davis.
United States Patent |
3,915,382 |
Davis |
October 28, 1975 |
Extension spray gun
Abstract
An extension spray gun comprising a telescopically extendable
pole having a spray nozzle secured to one end of the pole and a
valve secured to the other end to control flow of paint through a
flexible hose connected to the spray nozzle.
Inventors: |
Davis; J. C. (Dallas, TX) |
Family
ID: |
23846100 |
Appl.
No.: |
05/464,992 |
Filed: |
April 29, 1974 |
Current U.S.
Class: |
239/195; 239/281;
239/532; 401/140 |
Current CPC
Class: |
B05B
15/628 (20180201) |
Current International
Class: |
B05B
15/00 (20060101); B05B 15/06 (20060101); B05B
015/06 () |
Field of
Search: |
;222/74,174,523
;239/165,195-199,280,280.5,281,532,588 ;285/178 ;287/DIG.8
;403/350,351,352 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Love; John J.
Attorney, Agent or Firm: Moore; Howard E. Crutsinger; Gerald
G.
Claims
Having described my invention, I claim:
1. An extension spray gun comprising: a control valve; means to
connect said control valve to a source of pressurized fluid; a
tubular body; an orifice plate secured to a first end of said
tubular body; a plurality of hollow pole sections, each of said
pole sections having a bore extending therethrough; means
telescopically securing each of said pole section to another pole
section; means pivotally securing said tubular body to an end of
one of said pole sections; a flexible hose extending through the
bore in said hollow pole sections; means to secure a first end of
said flexible hose to a second end of said tubular body; and means
to secure a second end of said flexible hose to said control
valve.
2. An extension spray gun comprising: a plurality of tubular pole
sections having a bore extending longitudinally therethrough, said
tubular pole sections having first and second passages formed
therein communicating with said bore; a spray head; means to secure
said spray head to one of said tubular pole sections; valve means;
means to secure said valve means to one of said tubular pole
sections; a flexible conduit extending into said first passage,
through said bore, and out of said second passage; means to secure
a first end of said flexible conduit to said spray head; means to
secure a second end of said flexible conduit to said valve means;
means to deliver pressurized fluid to said valve means; a circular
plate having an aperture which is eccentric to the outer periphery
of said circular plate; means securing said circular plate in the
bore of a first of said pole sections; a tubular collar having a
bore formed therein; an end plate on said collar, said end plate
having an aperture which is eccentric to the bore in the tubular
collar; wherein an end of said first pole section extends into the
bore in said tubular collar; and wherein an end of a second of said
pole sections extends through the aperture in the end of the
tubular collar and through the aperture in the circular plate such
that upon rotation of said tubular collar said end plate will
frictionally engage said second pole section.
3. The combination called for in claim 2 wherein the means to
secure said spray head to one of said tubular pole sections
comprises: pivot means securing said spray head to one of said
tubular pole sections.
4. The combination called for in claim 2 wherein said spray head
comprises: a hollow tubular body having first and second ends; a
tip cap having a passage formed therein and a shoulder extending
into said passage; an orifice plate; means securing said tip cap to
the first end of said tubular body such that said shoulder urges
said orifice plate into sealing engagement with the end of said
tubular body; and the means to secure the first end of the flexible
conduit to the spray head is secured to the second end of said
tubular body.
5. An extension spray gun comprising: a control valve; means to
connect said control valve to a source of pressurized fluid; a
plurality of tubular pole sections having a bore extending
longitudinally thereof, said tubular pole sections having first and
second passages formed therein communicating with said bore; means
telescopically securing each said tubular pole section to another
tubular pole section; a hollow tubular body having first and second
ends; means pivotally securing said tubular body to a first end of
a first of said tubular pole sections; a tip cap having a passage
formed therein and a shoulder extending into said passage in the
tip cap; an orifice plate; means securing said tip cap to the first
end of said tubular body such that said shoulder urges said orifice
plate into sealing engagement with the end of said tubular body; a
flexible hose extending into said first passage, through said bore,
and out of said second passage; means securing a first end of said
flexible hose to said control valve; means securing a second end of
said flexible hose to said second end of said tubular body; and
means securing said control valve intermediate opposite ends of a
second of said tubular pole sections.
6. The combination called for in claim 5 wherein said means
pivotally securing said tubular body to a first end of a first of
said tubular pole sections comprising an outwardly extending ear
secured to said tubular body, said ear having an aperture extending
therethrough; an adapter body extending into the bore in the first
end of said first pole section; means securing said adapter body
relative to said first pole section; a lug on said adapter body,
said lug having an aperture extending therethrough; and means
extending through said aperture in said ear and through said
aperture in said lug adjustably securing said lug relative to said
ear.
Description
BACKGROUND OF THE INVENTION
Airless type paint spray guns are connected to pumps which delivers
paint at pressures of, for example, 1,200-3000 psi through a spray
tip or nozzle.
Heretofore, in order to reach high overhead locations, the painter
has erected scaffolds which required a great deal of time and
labor. Expense involved in acquiring, transporting, erecting and
disassembling scaffolds is often a major portion of the total cost
of a painting project.
Ladders may be used to reach high locations but only allow the
painter to reach a limited area before moving the ladder.
Heretofore, no extension spray gun has been developed that is
readily extendable and has a fully adjustable spray nozzle with all
the capability of a regular spray gun.
SUMMARY OF INVENTION
I have devised an extension spray gun for spraying paint, varnish,
shellac, and the like, which is readily extendable and fully
adjustable to reach high overhead locations.
The apparatus basically comprises a pole, which is telescopically
extendable having a locking device to lock it at any length
desired; a spray nozzle pivotally connected to one end of the pole;
and a valve located at the other end of the pole with a flexible
hose extending between the valve and spray nozzle. The spray nozzle
is adapted for use with standard spray tips and therefore has all
of the capabilities of a regular spray gun. The flexible hose
permits adjustment of the length of the pole without elaborate seal
and swivel mechanisms employed in extension guns heretofore
devised.
A primary object of the invention is to provide a spray gun which
will reach high overhead areas while the painter is standing on the
ground.
Another object of the invention is to provide an attachment for a
conventional spray gun to eliminate the necessity for ladders and
scaffolding thus reducing the time required to paint an overhead
area.
A further object of the invention is to provide a spray gun having
an extension which is readily adjustable to reach varying heights
which a painter may encounter.
A further object of the invention is to provide an adjustable
mounting for a pole supported spray nozzle which may be pointed at
varying angles relative to the pole.
A still further object of the invention is to provide an extension
for a spray gun having a flexible connection between a spray nozzle
and a control valve such that the length of the extension is
readily adjustable without change of equipment or use of tools.
Other and further objects of the invention will become apparent
upon referring to the detailed description hereinafter following
and to the drawings annexed hereto.
BRIEF DESCRIPTION OF THE DRAWING
Drawings of a preferred embodiment of the invention are annexed
hereto so that the invention may be better and more fully
understood, in which:
FIG. 1 is a front elevational view of the extension spray gun;
FIG. 2 is a side elevational view;
FIG. 3 is a cross-sectional view taken along line 3--3 of FIG.
1;
FIG. 4 is a cross-sectional view taken along line 4--4 of FIG. 3;
and
FIG. 5 is a fragmentary elevational view of the nozzle head, parts
being broken away to more clearly illustrate the details of
construction.
Numeral references are employed to designate like parts throughout
the various figures of the drawings.
DESCRIPTION OF A PREFERRED EMBODIMENT
Referring to FIGS. 1 and 2 of the drawing, the numeral 10 generally
designates an extension spray gun having a telescopic pole 11, a
nozzle spray head 12, a valve 18 attached adjacent the lower end of
the pole 11, and a flexible hose 14 having a first end 14a
connected to control valve 18 and a second end 14b connected to
nozzle spray head 12.
Pole 11 comprises a plurality of hollow pole sections 19, 20, and
21 secured together by locking devices 22a and 22b for adjustment
of the length of pole 11; and an adapter 26 secured to the upper
end of pole 11. As will be hereinafter more fully explained, pole
11 may be shortened to substantially the length of base pole
section 19 by sliding intermediate section 20 into base section 19
and end pole section 21 into intermediate pole section 20 and
tightening locking devices 22a and 22b. The pole 11 may be extended
to full length by pulling out sections 19, 20, and 21.
As best illustrated in FIG. 4 of the drawing, a spacer flange 28 is
secured to the end 20b of intermediate pole section 20 and is
slidably disposed in the bore 19c extending through hollow base
section 19 of the pole 11.
Internal threads are preferably formed in the end 19a of the base
section 19 to removably secure a circular plate 30 in bore 19c. The
circular plate 30 has an aperture 31 extending therethrough which
is preferably eccentric to the outer periphery of circular plate
30, as will be hereinafter more fully explained.
Locking devices 22a and 22b are preferably of substantially
identical construction and each comprises a tubular collar 32
having an end plate 36 secured to one end thereof. The end plate 36
has an aperture 37 extending therethrough which is eccentric to the
inner wall of the collar 32. The end 20b of intermediate section 20
extends through apertures 31 and 37 and the end 19a of base section
19 extends into tubular collar 32.
It should be readily apparent that rotation of collar 32 will
result in movement of apertures 31 and 37 into or out of axial
alignment.
Apertures 31 and 37 preferably have a diameter slightly greater
than the outside diameter of intermediate section 20, permitting
axial movement of section 20 when apertures 31 and 37 are axially
aligned. However, movement of aperture 37 out of axial alignment
with aperture 31 will move surfaces 31a and 37a into frictional
engagement with the outer surface of intermediate section 20 of
pole 11 such that sections 19 and 20 of pole 11 are restrained
against relative movement.
The end 19a of base section 19 has a groove 33 formed in the outer
surface thereof into which the end of set screw 34 extends. Set
screw 34 is threadedly secured through the wall of collar 32 to
limit movement of collar 32 longitudinally of base pole section
19.
The locking devices 22a and 22b are preferably adapted to permit
longitudinal adjustment of sections 19, 20, and 21 while providing
rigidity between the sections to prevent excessive flexure of the
pole 11. As illustrated in FIG. 4 a set screw 35 extends through
the wall of the base section 19 to limit movement of intermediate
section 20 through the bore 19c. It should be appreciated that
limiting spacing between spacer flange 28 and plate 30 provides
rigidity between sections 19 and 20 of pole 11.
Valve 18 is a normally closed adjustable orifice type valve having
a trigger 46 and trigger guard 47.
Valve 18 may assume any desired configuration such as that employed
in conventional spray guns of the type manufactured by Spray
Systems Company of Bellwood, Illinois or Nordson Corporation of
Amherst, Ohio. However, if a conventional spray gun is employed to
provide a control valve mechanism, the spray tip should be removed
from the spray gun.
Valve 18 is secured by a suitable coupling to the end 14a of hose
14. In the illustrated embodiment of the invention, the coupling
comprises a male connector member 50 threadedly secured to valve
18. A female connector member 51 is secured to the end 14a of hose
14 and is threadedly secured to male connector 50.
The end 14b of hose 14 has a female connector 58 secure thereto
which is connectable to male connector 59 secured to nozzle spray
head 12.
As best illustrated in FIG. 1, base pole section 19 has a passage
54 extending through the wall thereof through which hose 14
extends. Hose 14 extends longitudinally through bores 19c, 20c and
21c of pole sections 19, 20 and 21, respectively, and through
passage 56 formed in the wall of end pole section 21.
Hose 14 preferably has a length exceeding the length of pole 11
when all of the pole sections 19, 20, and 21 are fully extended.
When pole sections 19, 20 and 21 are retracted to shorten pole 11,
the excess length of hose 14 is drawn through passage 54 and coiled
around lugs 52 and 53 secured to base pole section 19.
As illustrated in FIG. 5, the nozzle spray head 12 comprises a
hollow tubular body 60 having a deflected end portion 60a secured
to connector 59 which is connectable to the female connector 58
secured to the end 14b of hose 14. End 60b of body 60 is externally
threaded and extends into the female end 62a of tip adaptor 62. Tip
adapter 62 has an externally threaded male portion 62b to which
internally threaded tip cap 64 is threadedly secured.
Tip cap 64 has a passage 64a formed in the end thereof forming a
shoulder 64b engaging one side of orifice plate 65 which is urged
into sealing engagement with the end 62b of tip adapter 62.
The orifice plate 65 has an aperture 65a extending
therethrough.
Tubular body 60 has an outwardly extending ear 66 welded or
otherwise rigidly secured thereto intermediate opposite ends
thereof. Ear 66 has an aperture extending therethrough and is
pivotally attached to adapter 26 by adjustable means such as bolt
68a and wing nut 68b such that the axis 70 of tubular body 60, as
shown by the dashed line, may be moved at any angle between the
position shown by the dashed line 70' and the position by the
dashed line 70" making the nozzle head completely adjustable to any
spray angle desired.
The adapter 26 has a flattened end 26a forming a lug having an
aperture through which bolt 68a extends. The lower end 26b of
adapter 26 extends into bore 21c of end section 21 and is
restrained against movement by set screw 26c.
Extension spray gun 10 is connected by hose 15 to paint supply 16
having a pump 72 for pumping the paint from paint supply 16 through
hose 15 to control valve 18. A pressure relief valve 74 is
positioned between pump 72 and control valve 18 of extension spray
gun 10 such that when valve 18 is closed back pressure is relieved
through valve 74 and paint is recirculated to paint supply 16
through hose 15a.
Operation of the invention heretofore described is as follows:
Adjustment of spray nozzle 12 may be accomplished by loosening the
wing nut 68b and moving the spray head 12 to the desired angle and
then retightening the wing nut 68b.
The desired heighth is obtained by rotating collar 32 of locking
device 22a to release end section 21 and moving end section 21 to
the desired position then retightening collar 32. If additional
heighth is desired, section 20 may be extended by rotating locking
device 22b; extending intermediate section 20 and retightening
locking device 22b. As additional heighth is needed hose is taken
off lugs 52 and 53 and urged through passage 54 into the bore 19c
extending through base pole section 19.
The extension spray gun 19 is then connected to a conventional
pressurized paint supply 16. The extension spray gun 10 is then
gripped with one hand about valve 18 for controlling movement of
trigger 46 and another hand at the middle of base section 19 of
pole 11.
From the foregoing it should be readily apparent that the preferred
embodimemt herein described accomplishes the objects of the
invention hereinbefore discussed.
It should be appreciated that other and further embodiments of the
invention may be devised without departing from the basic concept
thereof.
* * * * *