U.S. patent application number 11/406307 was filed with the patent office on 2007-10-25 for device for pressurizing canisters of liquid adhesives and coatings.
Invention is credited to Dan Davis.
Application Number | 20070248473 11/406307 |
Document ID | / |
Family ID | 38619633 |
Filed Date | 2007-10-25 |
United States Patent
Application |
20070248473 |
Kind Code |
A1 |
Davis; Dan |
October 25, 2007 |
Device for pressurizing canisters of liquid adhesives and
coatings
Abstract
The present invention is a drum pressurization device for safely
and reliably pressurizing a liquid storage barrel with air from an
air pump. The drum pressurization device includes a housing having
a bottom and sides dimensioned and configured to house the barrel,
the housing bottom dimensioned and configured to support the bottom
of the barrel and the housing sides dimensioned and configured to
snugly retain the barrel sides. The device further includes a top
movably mounted to the housing sides and movable between an open
position wherein the housing top does not engage the top of the
barrel and a locked position wherein the housing top is locked in
position and securely engages and holds down the top of the barrel
housing. The pressurization device further includes a pressure
regulator coupled to the barrel for controlling the pressurization
of the barrel by the air pump.
Inventors: |
Davis; Dan; (Markham,
CA) |
Correspondence
Address: |
Elias C. Borges;Suite 406
555 Burnhamthorpe Road
Toronto
ON
M9C 2Y3
CA
|
Family ID: |
38619633 |
Appl. No.: |
11/406307 |
Filed: |
April 19, 2006 |
Current U.S.
Class: |
417/308 |
Current CPC
Class: |
F04F 1/06 20130101; B05B
9/04 20130101 |
Class at
Publication: |
417/308 |
International
Class: |
F04B 49/00 20060101
F04B049/00 |
Claims
1. A pressure spraying device for spraying a liquid through a spray
gun comprising: a storage barrel for storing the liquid, the
storage barrel having a top, a bottom and sides; a retaining
housing for securely retaining the storage barrel in an upright
position, the retaining housing having a bottom, a top and sides,
the bottom, the sides and bottom of the housing being dimensioned
and configured to fit snugly around the barrel such that the sides
of the barrel are constrained by the sides of the housing and the
bottom of the barrel is supported by the bottom of the housing; the
top of the housing being movably attached to the sides of the
housing and movable between an open position wherein the top of the
housing does not engage the top of the barrel and a locked position
wherein the top of the housing securely engages and holds down the
top of the barrel and the top of the housing is locked in position
relative to the sides of the housing; the sides of the housing
having a door movable between an open and closed position, the door
being dimensioned and configured to permit the barrel to pass
through the housing when the door is opened; a pressure regulator
for controlling the pressurization of the barrel by an air pump,
and a discharge line operatively coupled to the barrel for carrying
the liquid from the barrel to the spray gun.
2. The pressure spraying device of claim 1 further comprising a
first safety valve operatively coupled to the pressure regulator,
the first safety valve functioning between an open state wherein
the pressure regulator can pressurize the barrel and a closed state
wherein the pressure regulator cannot pressurize the barrel, the
first safety valve being operatively coupled to the housing top and
housing sides such that the first safety valve is in its open state
only when the housing top is in its locked position.
3. The pressure spraying device of claim 2 further comprising a
second safety valve operatively coupled to the pressure regulator,
the second safety valve being a blow out valve which vents when the
pressure inside the barrel exceeds a first predetermined
pressure.
4. The pressure spraying device of claim 3 further comprising a
third safety valve operatively coupled to the barrel, the third
safety valve being a blow out valve which vents when the pressure
inside the barrel exceeds a second predetermined pressure, the
second predetermined pressure being higher than the first
predetermined pressure.
5. The pressure spraying device of claim 1 wherein the housing top
is removably mounted to the housing sides by a plurality of
connector elements.
6. The pressure spraying device of claim 1 wherein the housing top
is a rigid substantially flat member dimensioned to lay flat
against the barrel top when the top is in its locked position.
7. The pressure spraying device of claim 6 wherein the housing top
has peripheral edges which over extend beyond the barrel top and
wherein the housing top is mounted to the sides of the frame by a
plurality of elongated mounting members which connect the
peripheral edges of the housing top to the housing sides.
8. The pressure spraying device of claim 7 wherein the elongated
mounting members comprise mounting bolts.
9. The pressure spraying device of claim 8 wherein the first safety
valve comprises a spring actuated valve which is normally biased
towards the closed state, the first valve having a lever which,
when activated, moves the valve into its open state, the first
valve being positioned on the housing sides such that when the
housing top is moved into its locked position a portion of the
housing top bears against the lever with sufficient force to move
the valve into its opened position.
10. A drum pressurization device for pressurizing a liquid storage
barrel with air from an air pump, said barrel having a top, a
bottom and sides, said drum pressurization device comprising: a
housing having a bottom and sides dimensioned and configured to
house the barrel, the housing bottom dimensioned and configured to
support the bottom of the barrel and the housing sides dimensioned
and configured to snugly retain the barrel sides; a top movably
mounted to the housing sides and movable between an open position
wherein the housing top does not engage the top of the barrel and a
locked position wherein the housing top is locked in position and
securely engages and holds down the top of the barrel housing; a
pressure regulator coupled to the barrel for controlling the
pressurization of the barrel by the air pump.
11. The drum pressurization device of claim 10 further comprising a
first safety valve operatively coupled to the regulator, the first
safety valve functioning between an open state wherein the pressure
regulator can pressurize the barrel and a closed state wherein the
pressure regulator cannot pressurize the barrel, the first safety
valve being operatively coupled to the housing top such that the
first safety valve is in its open state only when the housing top
is in its locked position.
12. The drum pressurization device of claim 11 further comprising a
second safety valve operatively coupled to the pressure regulator,
the second safety valve being a blow out valve which vents when the
pressure inside the barrel exceeds a first predetermined pressure
level.
13. The drum pressurization device of claim 12 further comprising a
third safety valve operatively coupled to the barrel, the third
safety valve being a blow out valve which vents when the pressure
inside the barrel exceeds a second predetermined pressure level,
the second predetermined pressure level being higher than the first
predetermined pressure level.
14. The drum pressurization device of claim 10 wherein the housing
top is a rigid substantially flat member dimensioned to lay flat
against the barrel top when the top is in its locked position.
15. The drum pressurization device of claim 14 wherein the housing
top has peripheral edges which over extend beyond the barrel top
and wherein the housing top is mounted to the sides of the frame by
a plurality of elongated mounting members which connect the
peripheral edges of the housing top to the housing sides.
16. The drum pressurization device of claim 15 wherein the
elongated mounting members comprise elongated threaded bolts and
wherein the peripheral edges of the housing top is provided with a
plurality of apertures each of which is dimensioned to receive one
of the bolts, the apertures being positioned along the peripheral
edges of the housing top to align with the bolts, and wherein the
housing top is secured in its locked position by a plurality of
locking nuts secured to the bolts.
17. The drum pressurization device of claim 16 wherein the first
safety valve comprises a spring actuated valve which is normally
biased towards the closed state, the first valve having a lever
which, when activated, moves the valve into its open state, the
first valve being positioned on the housing sides such that when
the housing top is moved into its locked position a portion of the
housing top bears against the lever with sufficient force to move
the valve into its opened position.
18. A drum pressurization device for pressurizing a standard sized
storage barrel with air from an air pump, said barrel having a top,
a bottom and sides, said drum pressurization device comprising: a
pressure regulator coupled to the barrel and the air pump for
controlling the pressurization of the barrel by the air pump; a
housing for supporting the barrel in an upright position as the
barrel is pressurized, the housing having a bottom and sides
dimensioned and configured to house the barrel, the housing bottom
dimensioned and configured to support the bottom of the barrel and
the housing sides dimensioned and configured to snugly retain the
barrel sides and hold the barrel upright as the barrel is
pressurized; a top movably mounted to the housing sides and movable
between an open position wherein the housing top does not engage
the top of the barrel and a locked position wherein the housing top
is locked in position to the housing sides and securely engages and
holds down the top of the barrel housing; a first safety valve
operatively coupled to the pressure regulator, the first safety
valve having an open state wherein the pressure regulator can
pressurize the barrel and a closed state wherein the pressure
regulator cannot pressurize the barrel, the first safety valve
being operatively coupled to the housing top such that the first
safety valve is in its open state only when the housing top is in
its locked position.
19. The drum pressurization device of claim 18 wherein the housing
top is a rigid substantially flat member dimensioned to lay flat
against the barrel top when the top is in its locked position, the
housing top having peripheral edges which over extend beyond the
barrel top and wherein the housing top is mounted to the sides of
the frame by a plurality of elongated mounting members which
connect the peripheral edges of the housing top to the housing
sides.
20. The drum pressurization device of claim 19 wherein the first
safety valve comprises a spring actuated valve which is normally
biased towards the closed state, the first valve having a lever
which, when activated, moves the valve into its open state, the
first valve being positioned on the housing sides such that when
the housing top is moved into its locked position a portion of the
housing top bears against the lever with sufficient force to move
the valve into its opened position.
Description
FIELD OF THE INVENTION
[0001] The invention relates generally to devices for pressurizing
canisters for dispensing to sprayers.
BACKGROUND OF THE INVENTION
[0002] Liquid products such as liquid adhesives are commonly
applied by means of brushes and rollers. In order to speed up
production, pressure sprayers are often used to apply these liquid
adhesives. Traditionally, pressure spraying liquid adhesives has
been achieved by using a traditional pressure spray gun arrangement
which uses a pressure pump in combination with a spray gun. The
pressure pump generally includes a pneumatically powered liquid
pump with an intake line coupled to a supply of liquid adhesive and
a discharge line coupled to the spray gun. This system of pressure
spraying is very convenient since it permits the user to simply
place the intake line in the liquid container and then simply turn
on the pump to commence spraying the product. Unfortunately, this
system will not work with many water-based adhesives because the
liquid adhesive tends to coagulate in the pump and lines.
[0003] Another common method of pressure spraying is to place a
quantity of spraying liquid in a pressure vessel and then
pressurizing the atmosphere in the vessel. The vessel has a
discharge port through which the spraying liquid can pass to a
discharge line coupled to the spray gun. This system has met with
some success for use with water based liquid adhesives; however,
this system has several drawbacks. Firstly, the costs of such a
system are significant because it requires the use of a pressure
vessel and corresponding pressurizing equipment. Furthermore,
pressure vessels of this type generally have relatively small
pressure chambers and therefore require frequent filling. Finally,
this system requires the user to open the pressure vessel and then
fill it periodically with liquid adhesive. This in turn requires
the user to move barrels of liquid adhesive into proximity with the
pressure sprayer and go through the step of transferring the liquid
adhesive from the storage barrels to the pressure sprayer.
Therefore, this system of pressure spraying is inconvenient and
often difficult to use. An improved method of spraying water based
liquid adhesives is therefore required; one which enables the use
of the original storage barrel as the dispensing vessel.
SUMMARY OF THE INVENTION
[0004] In accordance with the present invention, there is provided
a drum pressurization device for safely and reliably pressurizing a
liquid storage barrel with air from an air pump. The drum
pressurization device includes a housing having a bottom and sides
dimensioned and configured to house the barrel, the housing bottom
dimensioned and configured to support the bottom of the barrel and
the housing sides dimensioned and configured to snugly retain the
barrel sides. The device further includes a top movably mounted to
the housing sides and movable between an open position wherein the
housing top does not engage the top of the barrel and a locked
position wherein the housing top is locked in position and securely
engages and holds down the top of the barrel housing. The
pressurization device further includes a pressure regulator coupled
to the barrel for controlling the pressurization of the barrel by
the air pump.
[0005] The present invention is also directed towards a drum
pressurization device including a housing dimensioned and
configured to house and support the barrel. The device includes a
top movably mounted to the housing and movable between an open
position wherein the housing top does not engage the top of the
barrel and a locked position wherein the housing top is locked in
position and securely engages and holds down the top of the barrel
housing. The pressurization device further includes a pressure
regulator coupled to the barrel for controlling the pressurization
of the barrel by an air pump. The device further includes a safety
valve which is operatively coupled to the pressure regulator, the
safety valve having a closed state preventing the pressure
regulator to pressurize the barrel and an open state permitting the
regulator to pressurize the barrel, the safety valve being
operatively coupled to the top such that the regulator is in its
open state only when the top is in its locked position.
[0006] With the foregoing in view, and other advantages as will
become apparent to those skilled in the art to which this invention
relates as this specification proceeds, the invention is herein
described by reference to the accompanying drawings forming a part
hereof, which includes a description of the preferred typical
embodiment of the principles of the present invention.
DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1. is a perspective view of a barrel pressurization
device made in accordance with the invention showing a barrel about
to be pressurized.
[0008] FIG. 2. is a perspective view of the barrel pressurization
device shown in FIG. 1 showing the barrel removed.
[0009] FIG. 3. is a perspective view of the first safety valve
portion of a barrel pressurization device made in accordance with
the present invention.
[0010] In the drawings like characters of reference indicate
corresponding parts in the different figures.
DETAILED DESCRIPTION OF THE INVENTION
[0011] Referring firstly to FIG. 1, the present invention comprises
a pressure spraying device shown generally as item 10 consisting of
a storage barrel 12, secured within housing 14 and coupled to
pressure regulator 42 and discharge 18. Storage barrel 12 consist
of a standard plastic or metal drum barrel of the type commonly
used to store liquids such as water based liquid adhesives. Barrel
12 has top 13, sides 15 and bottom 17. Any standard plastic or
metal storage barrels may be used; however, the barrels used in the
invention as shown will range in size between 50 and 55 gallons. If
larger or smaller barrels are to be used, then the size of housing
14 will have to be changed.
[0012] Housing 14 consists of a tubular steel frame having a door
20 pivotally connected to main sides 24 and a top 22 which is
removably attached to frame sides 24. Door 20 is made from a
plurality of steel tubes and is pivotally movable between a locked
closed position as shown if FIG. 1 and an open position as shown in
FIG. 2. When door 20 is in its open position, it leaves open door
way 11 which is dimensioned to permit barrel 12 to pass in and out
of the doorway. Door 20 may be locked in its closed position by
locking members 50 and 52, or by any other suitable locking
mechanism.
[0013] Frame sides 24 are made from a plurality of steel tubes and
are dimensioned and configured to snugly retain barrel 12 in an
upright position. Top 22 consists of a substantially flat member
made up of a plurality of steel tubes and generally takes the forms
of a triangular frame having corners 21, 23 and 25. Top 22 is
dimensioned and configured such that the triangular frame rests
flat on top of top portion 13 of barrel 12 and a peripheral edge
formed from corners 21, 23 and 25 extend beyond the top portion of
the barrel. Corners 21, 23 and 25 extend sufficiently beyond barrel
top 13 to permit the corners to be secured to main frame 24 by
elongated threaded tie down bolts 27, 29 and 31, respectively.
Corners 21, 23 and 25 have apertures 33, 35 and 37, respectively,
which are dimensioned and positioned to receive the tie down bolts.
When engaged by tie down nuts 40, tie down bolts 27, 29 and 31
firmly anchor top 22 to housing sides 24 such that top portion 13
of barrel 12 cannot move upward.
[0014] Air to pressurize the system is supplied by standard air
compressor pump 47 which is connected to air intake 34 by standard
air line 49. Air intake 34 is coupled to safety valve 38 by air
line 36. First safety valve 38 is in turn coupled to pressure
regulator assembly 42 by air line 39. Pressure regulator assembly
42 is in turn operatively coupled to safety valve 48 which is
coupled to air line 44 which is coupled to safety valve 46 which is
in turn coupled to barrel 12. Air regulator 42 is made up of air
valves and pressure gauges which are calibrated to precisely
control the air pressure in barrel 12 to within an operating range
of o to approximately 8 psi. Safety valve 38 is a spring biased
shut off valve which is biased towards a shut off state preventing
the flow of air from air compressor 47 to air regulator assembly
42. Safety valve 38 is physically coupled to housing top 22 by arm
54. As better seen in FIG. 3, safety valve 38 has a lever 56 which
controls the operation of the valve. Lever 56 is spring biased into
its closed position. However, when housing top 22 is locked into
its closed position, control arm 58 of arm 54 engages lever 56 and
forces the lever downwardly to open the safety valve. In this way,
safety valve 38 can only be opened when housing top 22 is fully
locked in position, thereby preventing the accidental
pressurization of barrel 12.
[0015] Referring back to FIG. 1, pressure regulator assembly 42
includes safety pressure blow off valve 48. Safety valve 48 is a
pressure blow off valve which is calibrated to vent the pressure in
regulator assembly 42 when the pressure in the regulator assembly
exceeds 8 psi. Safety valve 48 provides a level of safety against
accidentally pressurizing barrel 12 to pressures exceeding 8 psi.
Safety valve 46 is also a pressure blow off valve which is
calibrated to vent the pressure in barrel 12 when the pressure in
the barrel exceeds 11 psi. Safety valve 46 provides an additional
layer of safety should safety valve 48 fail.
[0016] The operation of the present system will now be discussed.
Housing 14 is first opened by opening door 20 and removing top 22.
A full barrel 12 is then loaded into the housing. Door 20 is closed
and locked by engaging locking members 50 and 52. Top 22 is then
loaded onto frame 14 positioned in place over barrel top 13.
Pressure valve 46 and discharge 18 (to which a fluid line leading
to the spray gun is attached) are then coupled to barrel 12. Top 22
is then locked into its locked position. Air line 49 may then be
coupled to intake 34 and the air pump may be activated to commence
pressurizing the barrel. As the barrel is pressurized, its natural
tendency is to deform and balloon outwardly, but since the barrel
is securely held in an upright position in housing 14 and since top
22 is locked in place against top 13 of the barrel, the barrel can
be safely pressurized without fear of injury resulting from the
failure of the barrel. The precise pressure inside the barrel can
be adjusted using pressure regulator assembly 42. In the event of a
failure of the pressure regulator assembly, safety valves 48 and 46
prevent the barrel from becoming dangerously over pressurized.
[0017] A specific embodiment of the present invention has been
disclosed; however, several variations of the disclosed embodiment
could be envisioned as within the scope of this invention. It is to
be understood that the present invention is not limited to the
embodiments described above, but encompasses any and all
embodiments within the scope of the following claims.
* * * * *