NZ751727B - Paint spray gun - Google Patents
Paint spray gunInfo
- Publication number
- NZ751727B NZ751727B NZ751727A NZ75172719A NZ751727B NZ 751727 B NZ751727 B NZ 751727B NZ 751727 A NZ751727 A NZ 751727A NZ 75172719 A NZ75172719 A NZ 75172719A NZ 751727 B NZ751727 B NZ 751727B
- Authority
- NZ
- New Zealand
- Prior art keywords
- valve
- needle
- air
- disposed
- spray
- Prior art date
Links
- 239000007921 spray Substances 0.000 title claims abstract description 85
- 239000003973 paint Substances 0.000 title claims abstract description 56
- 238000004891 communication Methods 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 210000001503 Joints Anatomy 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 5
- 229910052709 silver Inorganic materials 0.000 abstract description 2
- 239000004332 silver Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000889 atomisation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002708 enhancing Effects 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
- B05B11/0005—Components or details
- B05B11/0037—Containers
- B05B11/0054—Cartridges, i.e. containers specially designed for easy attachment to or easy removal from the rest of the sprayer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
- B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
- B05B11/06—Gas or vapour producing the flow, e.g. from a compressible bulb or air pump
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/002—Manually-actuated controlling means, e.g. push buttons, levers or triggers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/60—Arrangements for mounting, supporting or holding spraying apparatus
- B05B15/63—Handgrips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
- B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
- B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
- B05B7/068—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet the annular gas outlet being supplied by a gas conduit having an axially concave curved internal surface just upstream said outlet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
- B05B7/1209—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means for each liquid or other fluent material being manual and interdependent
- B05B7/1245—A gas valve being opened before a liquid valve
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
- B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
- B05B7/2405—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle
- B05B7/2408—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle characterised by the container or its attachment means to the spray apparatus
- B05B7/241—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle characterised by the container or its attachment means to the spray apparatus the container being pressurised
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
- B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
- B05B7/2405—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle
- B05B7/2435—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle the carried liquid and the main stream of atomising fluid being brought together by parallel conduits placed one inside the other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
- B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
- B05B7/2478—Gun with a container which, in normal use, is located above the gun
Abstract
conventional paint spray gun may be poorly welded by multiple welding steps, or required to be welded by silver. To solve at least one of the drawbacks, a paint spray gun includes a gun body (10) formed as a unitary one piece structure composed of a tubular body portion (14), a valve connection portion (15), an air passageway portion (16) and a feed connection portion (17). A spray cap (12) is disposed on the tubular body portion (14) and has a cap opening (146). The tubular body portion (14) has an air chamber (141) that is covered by the spray cap (12) and that communicates with the cap opening (146), and a feed passage (142) connected to the chamber (141). The valve connection portion (15), the air passageway portion (16) and the feed connection portion (17) are formed as one piece with the tubular body portion (14) without welded joints. rtion (15), an air passageway portion (16) and a feed connection portion (17). A spray cap (12) is disposed on the tubular body portion (14) and has a cap opening (146). The tubular body portion (14) has an air chamber (141) that is covered by the spray cap (12) and that communicates with the cap opening (146), and a feed passage (142) connected to the chamber (141). The valve connection portion (15), the air passageway portion (16) and the feed connection portion (17) are formed as one piece with the tubular body portion (14) without welded joints.
Description
PAINT SPRAY GUN
FIELD
The disclosure relates to a spray gun, and more
particularly to a paint spray gun.
BACKGROUND
Figures 1 and 2 illustrate a conventional paint
spray gun, which includes a gun body 1, a nozzle 2
disposed on a front end of the gun body 1, a needle member
3 movably disposed in the gun body 1 and extending
through the nozzle 2, an air valve assembly 4 disposed
in the gun body 1 for providing high air pressure input,
a paint cup 5 attached to the gun body 1, and a trigger
6 pivotally connected to the gun body 1. The gun body
1 has a main body 101, a valve tube 102 welded to the
main body 101 in connection with the air valve assembly
member 4, an air passageway member 103 welded between
the main body 101 and the valve tube 102, a feed tube
104 welded to the main body 101, and a trigger connection
member 105 welded to the main body 101. A bottom side
of the main body 101 has an air feed hole 106. A front
side of the valve tube 102 has an air valve hole 107.
The air passageway member 103 is hollow and has a
communication space 108 communicating with the air feed
hole 106 and the air valve hole 107. The air valve
assembly member 4 is connected to the valve tube 102.
The trigger 6 is pivotally connected to the trigger
connection member 105. The paint cup 5 is connected to
the feed tube 104.
When the needle member 3 is actuated by the trigger
6 to open the nozzle 2 such that the air valve assembly
member 4 is transitioned from a close state to an open
state, high pressure air enters a front inner space of
the main body 101 through the air valve assembly member
4, the air valve hole 107, the communication space 108
and the air feed hole 106. When the high pressure air
is sprayed out of the nozzle 2, negative pressure around
the nozzle 2 produces a suction force that draws paint
from the paint cup 5 and atomizes it through the nozzle
2 onto an object (not shown) for being painted.
However, the conventional paint spray gun may
encounter the following disadvantages during use or
manufacture:
1. Because the main body 101, the valve tube
102, the air passageway member 103, the feed tube
104 and the trigger connection member 105 are
welded together for forming the gun body 1, it is
required to perform multiple welding steps which
are troublesome and increase manufacture costs.
In case of faulty welding operation, it can affect
the appearance and quality of painted products.
2. If the valve tube 102 and the main body
101 are poorly welded to each other, or if the air
passageway member 103, the main body 101 and the
valve 102 are poorly welded together, poor welded
joints can tend to leak. High pressure air input
from the air valve assembly member 4 around the
nozzle 2 can be instable or insufficient, and the
paint can be unevevnly or insufficiently atomized.
Uneven atomization can affect aesthetic
appearance and integrity of painted products . In
addition, leakage at poor weld joints can impose
extra load on an air compressor (not shown) and
waste energy.
3. If the feed tube 104 and the main body
101 is poorly welded to each other, paint may leak
from poor weld joint of the feed tube 104 and the
main body 101. In addition, external air can be
mixed with the paint through the poor weld joint
and form air bubbles therein. During a paint
spraying operation, paint can be intermittently
atomized, causing rough or incomplete atomization
of the paint, which adversely affect aesthetic
appearance of the painted products.
4. Generally, the gun body 1 is welded by
using silver. Therefore, the gun body 1 has to be
made from copper. Because an aluminum alloy cannot
be used for manufacturing the gun body 1, the
weight of the gun body is unable to be reduced.
SUMMARY
Therefore, an object of the disclosure is to
provide a paint spray gun that can alleviate at least
one of the drawbacks of the prior art, and/or to at least
provide the public with a useful choice.
According to the invention, a paint spray gun is
provided and comprises:
A gun unit including a gun body, a spray cap and
a nozzle. The gun body is formed as a unitary one piece
structure composed of a tubular body portion, a valve
connection portion, an air passageway portion and a feed
connection portion. The spray cap is disposed on a
tubular front end of the tubular body portion and has
a cap opening. The tubular body portion has an air
chamber that is disposed inside the tubular front end
and covered by the spray cap and that communicates with
the cap opening, and a feed passage connected to a rear
end of the air chamber. The valve connection portion
is integrally formed with and extends downwardly from
a bottom side of the tubular body portion. The valve
connection portion has a valve connecting hole. The air
passageway portion is integrally formed with and
extends downwardly from the bottom side of the tubular
body portion and the valve connection portion, and has
an air passageway in fluid communication with the valve
connecting hole and the air chamber. The feed connection
portion is integrally formed with and extends upwardly
from a top side of the tubular body portion, and has
a feed inlet hole in communication with the feed passage.
The nozzle is received in the spray cap and has a nozzle
tip extending into the cap opening. The nozzle fluidly
communicates the feed passage and fluidly disconnects
the air chamber.
A spray unit including a spray needle that extends
in the feed passage and the nozzle tip. The spray needle
is movable axially within the tubular body portion
between a non-delivery position, where the spray needle
closes the nozzle tip, and a delivery position where
the spray needle opens the nozzle tip.
An air valve unit connected to the valve connection
portion. The air valve unit is transitionable between
a closing state where the air valve unit has no fluid
communication with the valve connecting hole, and an
opening state where the air valve unit is in
communication with the valve connecting hole.
An operation unit disposed on the gun body. The
operation unit drives the spray needle to move between
the non-delivery position and the delivery position,
and actuates the air valve unit to transition between
the closing state and the opening state.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features and advantages of the disclosure
will become apparent in the following detailed
description of the embodiment with reference to the
accompanying drawings, of which:
Figure 1 illustrates a conventional paint
spray gun;
Figure 2 is a partly exploded perspective view
of the conventional paint spray gun;
Figure 3 is a perspective view illustrating
an embodiment of a paint spray gun according to
the disclosure;
Figure 4 is an exploded perspective view of
the embodiment;
Figure 5 is a perspective view of a gun body
of the embodiment;
Figure 6 is a sectional view of the embodiment
with a spray unit at a non-delivery position, an
air valve unit at a close state, and a slide member
at an initial position;
Figure 7 is an enlarged view of a region of
the sectional view shown in Figure 6;
Figure 8 is an enlarged view of another region
of the sectional view shown in Figure 6;
Figure 9 is a sectional view of the embodiment
illustrating the spray unit at a non-delivery
position, the air valve unit at an open state, and
the slide member at a first operating position;
Figure 10 is a sectional view of the
embodiment illustrating the spray unit at a
delivery position, the air valve unit at the open
state, and the slide member at a second operating
position; and
Figure 11 is an enlarged fragmentary view of
the sectional view shown in Figure 10.
DETAILED DESCRIPTION
Figures 3 to 4 illustrate an embodiment of a paint
spray gun 100 according to the disclosure. The paint
spray gun 100 includes a gun unit 10, a spray unit 20,
an air valve unit 30, an operation unit 40 and a paint
cup 70.
The gun unit 10 includes a gun body 11, a spray
cap 12, a spring cap 121, a stop member 122, a tail cap
123, a needle cap 124 and a nozzle 13.
As shown in Figure 5, the gun body 11 is formed
as a unitary one piece structure composed of a tubular
body portion 14, a valve connection portion 15, an air
passageway portion 16, a feed connection portion 17 and
a trigger connection portion 18.
As shown in Figures 6 to 8, the spray cap 12 is
removably disposed in a tubular front end of the tubular
body portion 14 and has a cap opening 146. The tubular
body portion 14 has an air chamber 141 that is disposed
inside the tubular front end and covered by the spray
cap 12 and that communicates with the cap opening 146,
a feed passage 142 connected to a rear end of the air
chamber 141, a feed tube 147 disposed in the air chamber
141 and the feed passage 142, a needle operating space
143 disposed rearwardly of the feed passage 142 and
opening at a tubular rear end of the tubular body portion
14, and a gasket receiving passage 144 disposed between
the feed passage 142 and the needle operating space
143. In this embodiment, a rear end of the feed tube
147 fluidly communicates the feed passage 142. The feed
tube 147 fluidly disconnects the air chamber 141.
The valve connection portion 15 is integrally
formed with and extends downwardly from a bottom side
of the tubular body portion 14. The valve connection
portion 15 has a valve connecting hole 151. In addition,
the tubular body portion 14 further has a valve shaft
passage 145 disposed between the needle operating space
143 and the valve connecting hole 151 of the valve
connection portion 15, and a middle hole 148 disposed
between the valve shaft passage 145 and the valve
connecting hole 151. The middle hole 148 has a cross
section larger than the valve shaft passage 145 and
smaller than the valve connecting hole 151.
The air passageway portion 16 is integrally formed
with and extends downwardly from the bottom side of the
tubular body portion 14 and connects the valve
connection portion 15, and has an air passageway 161
in fluid communication with the valve connecting hole
151 and the air chamber 141.
The feed connection portion 17 is integrally
formed with and extends upwardly from the top side of
the tubular body portion 14, and has a feed inlet hole
171 in communication with the feed passage 142.
The trigger connection portion 18 is integrally
formed with and extends upwardly from the top side of
the tubular body portion 14.
In this embodiment, the spring cap 121 is disposed
in the tubular rear end of the tubular body portion 14
and extends into the needle operating space 143. The
stop member 122 is disposed in the needle operating
space 143 in front of the spring cap 121. The tail cap
123 is connected to the tubular rear end of the tubular
body portion 14 and covers the spring cap 121. The needle
cap 124 is removably connected to a front end of the
spray cap 12.
The nozzle 13 is received in the spray cap 12 and
a front end of the feed tube 147, and has a nozzle tip
131 extending into the cap opening 146. By virtue of
the feed tube 147 disposed in the air chamber 141 and
the feed passage 142, the nozzle 13 fluidly communicates
the feed passage 142 and fluidly disconnects the air
chamber 141. In this embodiment, the nozzle 13 further
has a nozzle rear end that is opposite to the nozzle
tip 131 and that fluidly connects a front end of the
feed tube 147.
The spray unit 20 includes a spray needle 21, a
needle sleeve 22 and a first resilient member 23. The
spray needle 21 extends in the feed passage 142, the
feed tube 147 and the nozzle tip 131. The needle sleeve
22 is sleeved on the spray needle 21, is movably disposed
in the needle operating space 143, and extends
rearwardly and outwardly of the spring cap 121. The
first resilient member 23 is disposed in the spring cap
121 and around the spray needle 21, and abuts the needle
sleeve 22.
The spray needle 21 is movable axially within the
tubular body portion 14 between a non-delivery position
(see Figures 6 and 7), where the spray needle 21 closes
the nozzle tip 131, and a delivery position (see Figures
10 and 11), where the spray needle 21 opens the nozzle
tip 131.
The first resilient member 23 provides a pushing
force to move forwardly the needle sleeve 22, which
brings the spray needle 21 to the non-delivery position.
In this embodiment, the first resilient member 23 is
a compression spring.
The air valve unit 30 includes a valve housing 31,
a valve shaft 32, a stopper seal ring 33 and a valve
spring 34. The valve housing 31 is connected to and
inserted into the valve connecting hole 151 of the valve
connection portion 15, and has an air supply valve
passage 311. The valve shaft 32 extends movably through
the air supply passage 311 of the valve housing 31 into
the needle operating space 143 of the tubular body
portion 14. The stopper seal ring 33 is sleeved around
said valve shaft 32. The valve spring 34 is disposed
in the air supply valve passage 311, and abuts the valve
housing 31 and the valve shaft 32 to urge the valve shaft
32 to move into the needle operating space 143. In this
embodiment, the valve housing 31 further has a valve
seat 36 formed around the valve shaft 32. The valve shaft
32 has a generally conical stopper portion 320 proximal
to the valve seat 36. The stopper seal ring 33 is sleeved
on the stopper portion 320.
The air valve unit 30 is transitionable between
a closing state (see Figure 8) where the air valve unit
has no fluid communication with the valve connecting
hole 151, and an opening state (see Figure 9) where the
air valve unit 30 is in communication with the valve
connecting hole 151. As shown in Figure 8, when the air
valve unit 30 is in the closing state, the stopper seal
ring 33 is seated on the valve seat 36, thereby
interrupting an air flow passing through the air supply
valve hole 311. As shown in Figure 9, when the air valve
unit 30 is in the opening state, the stopper seal ring
33 moves away from the valve seat 36 and does not
interrupt the air flow passing through the air supply
valve hole 311.
As shown in Figures 4 and 8, the operation unit
40 is disposed on the gun body 11. The operation unit
40 includes a slide member 41, a trigger 42 and a second
resilient member 43. The slide member 41 is sleeved
around the spray needle 21 forwardly of the needle
sleeve 22 and is slidable within the needle operating
space 143. The trigger 42 is pivotally connected to the
trigger connection portion 18 and is engageable with
the slide member 41. The second resilient member 43 is
disposed in abutment between the slide member 41 and
the stop member 122. In addition, the slide member 41
has a valve-actuating push surface 411 and a rear push
surface 412. The valve-actuating push surface 411 is
in contact with an end of the valve shaft 32 and extends
into the needle operating space 143. The rear push
surface 412 faces the needle sleeve 22. The second
resilient member 43 is a compression spring.
The slide member 41 is actuated by the trigger 42
to move to an initial position (see Figure 6), a first
operating position (see Figure 9), or a second operating
position (see Figure 10). The second resilient member
43 urges the slide member 41 to return to the initial
position.
As shown in Figures 6 and 8, when the slide member
41 is at the initial position, the rear push surface
412 is spaced apart from the needle sleeve 22, the
valve-actuating push surface 411 contacts with but does
not push the valve shaft 32, the spray needle 21 is at
the non-delivery position, and the air valve unit 30
in the closing state.
As shown in Figure 9, when the slide member 41 is
at the first operating position, the rear push surface
412 contacts with but does not push the needle sleeve
22, the spray needle 21 is at the non-delivery position,
and the valve-actuating push surface 411 presses the
valve shaft 32 such that the air valve unit 30
transitions from the closing state (see Figure 8) to
the opening state (see Figure 9).
As shown in Figure 10 and 11, when the slide member
41 is at the second operating position, the
valve-actuating push surface 411 presses the valve
shaft 32 such that the air valve unit 30 is in the fully
opening state, and the rear push surface 412 pushes the
needle sleeve 22 to move the spray needle 21 from the
non-delivery position (see Figure 6) to the delivery
position (see Figure 10).
As shown in Figures 6 and 7, the gun unit 10 further
includes a feed passage gasket 51 and a limiting ring
52. The feed passage gasket 51 is disposed within the
gasket receiving passage 144 to seal the feed passage
142 from the needle operating space 143. The limit ring
52 is threadedly secured within the gasket receiving
space 144 to position the feed passage gasket 51. The
spray needle 21 extends through the limit ring 52 and
the feed passage gasket 51 into the feed passage 142.
The feed passage gasket 51 is a Teflon gasket and
prevents external air from being drawn into the feed
passage 142 and being mixed with a paint material fed
into the feed passage 142. In addition, the feed passage
gasket 51 prevents the paint material in the feed
passage 142 from flowing into the needle operating space
143.
As shown in Figure 6, the paint cup 70 is removably
connected to the feed inlet hole 171 of the paint
connection portion 17 in communication with the feed
passage 142.
As shown in Figure 8, the air valve unit 30 further
includes a valve gasket 61, a packing plate 62 and a
compression spring 63. The valve gasket 61 is disposed
within the middle hole 146. The packing plate 62 is
disposed within the valve connecting hole 151 and abuts
the valve gasket 61. The compression spring 63 is
disposed in the valve connecting hole 151 and abuts the
packing plate 62 and the valve housing 31. The valve
shaft 32 extends through the compression spring 63, the
packing plate 62, the valve gasket 61 and the valve shaft
hole 145 from the air supply passage 331 into the needle
operating space 143. In this embodiment, the valve
gasket 61 prevents high pressure air input by the air
valve unit 30 into the valve connecting hole 151 from
flowing into the needle operating space 143 through the
valve shaft passage 145. This ensures that the high
pressure air sprayed out of the cap opening 146 has
sufficient pressure (see Figure 7).
When the slide member 41 is actuated by the trigger
42 to move from the initial position (see Figure 6) to
the first operation position (see Figure 9), the air
valve unit 30 transitions to the opening state by the
valve-actuating push surface 411 that pushes the valve
shaft 32. Therefore, high pressure air input from an
air pressure source, e.g. an air compressor (not shown),
into the air supply passage 311 enters the air chamber
141 through the valve connecting hole 151 and the air
passageway 161, flows externally around the nozzle 13,
and is sprayed out of the cap opening 146 to remove dust
on an object (not shown) for being painted. Because the
spray needle 21 is at the non-delivery position, it
prevents paint from being sprayed out of the nozzle tip
131.
When the slide member 41 is actuated by the trigger
42 to move from the first operation position (see Figure
9) to the second operation position (see Figures 10 and
11), not only does the valve-actuating push surface 411
press the valve shaft 32 to place the air valve unit
in the fully opening state, but the rear push surface
412 pushes the needle sleeve 22 to move the spray needle
21 to the delivery position such that the spray needle
21 opens the nozzle tip 131. Because the high pressure
air is sprayed out of the cap opening 146, pressure drops
around the nozzle 13, and the paint in the paint cup
70 is drawn into the nozzle 13 through the feed passage
142 and is atomized from the nozzle tip 131 onto the
object to be painted.
The paint spray gun 100 has the following
advantages:
1. The gun body 11 is formed as a unitary one piece
structure which may be made by forging and injection
molding, followed by subsequent processes for forming
internal spaces and passages. Compared with the prior
art, because the gun body 11 does not require any welding
operations, it can be easily manufactured to reduce
manufacture costs, and also possesses good appearance.
2. Compared with the prior art, because the valve
connection portion 15 is integrally formed with the
tubular body portion 14, and because the air passageway
portion 16 is integrally formed with the tubular body
portion 14 and the valve connection portion 15, when
the high pressure air is delivered to the air chamber
141 from the valve connecting hole 151 through the air
passageway 161, leakage of high pressure air can be
avoided. Therefore, the high pressure air input from
the air valve unit 30 is ensured to be stable and
sufficient around the nozzle 13, and the paint can be
uniformly and sufficiently atomized for effectively
enhancing aesthetic appearance and integrity of
painted products. In addition, the gun body 11 prevents
air leakages and avoids extra load on the air compressor
to save energy.
3. Because the feed connection portion 17 is
integrally formed with the tubular body portion 14, when
paint flows from the paint cup 70 to the feed passage
142, leakage of the paint is prevented. In addition,
the external air is effectively prevented from being
mixed with the paint through a joint of the feed
connection portion 17 and tubular body portion 14.
During a spray paint operation, not only is the paint
continuously sprayed, but rough or incomplete
atomization of the paint is prevented, thereby
effectively enhancing aesthetic appearance of the
painted products.
4. Because the gun body 11 is formed as a unitary
one piece structure without welded joints, selection
of a material for manufacturing the gun body 11 is not
limited to the welding operations. Aside from cooper,
an aluminum alloy may be used to manufacture the gun
body 11 to reduce weight.
In the description above, for the purposes of
explanation, numerous specific details have been set
forth in order to provide a thorough understanding of
the embodiment. It will be apparent, however, to one
skilled in the art, that one or more other embodiments
may be practiced without some of these specific details.
It should also be appreciated that reference throughout
this specification to “one embodiment,” “an
embodiment,” an embodiment with an indication of an
ordinal number and so forth means that a particular
feature, structure, or characteristic may be included
in the practice of the disclosure. It should be further
appreciated that in the description, various features
are sometimes grouped together in a single embodiment,
figure, or description thereof for the purpose of
streamlining the disclosure and aiding in the
understanding of various inventive aspects, and that
one or more features or specific details from one
embodiment may be practiced together with one or more
features or specific details from another embodiment,
where appropriate, in the practice of the disclosure.
While the disclosure has been described in
connection with what is considered the exemplary
embodiment, it is understood that this disclosure is
not limited to the disclosed embodiment but is intended
to cover various arrangements included within the
spirit and scope of the broadest interpretation so as
to encompass all such modifications and equivalent
arrangements.
The term ‘comprising’ as used in this
specification and claims means ‘consisting at least in
part of’. When interpreting statements in this
specification and claims which include the term
‘comprising’, other features besides the features
prefaced by this term in each statement can also be
present. Related terms such as ‘comprise’ and
‘comprised’ are to be interpreted in a similar manner.
Claims (13)
1. A paint spray gun, comprising: a gun unit including a gun body, a spray cap and a nozzle, said gun body being formed as a unitary one 5 piece structure composed of a tubular body portion, a valve connection portion, an air passageway portion and a feed connection portion, said spray cap disposed on a tubular front end of said tubular body portion and having a cap opening, said tubular body portion having 10 an air chamber that is disposed inside said tubular front end and covered by said spray cap and that communicates with said cap opening, and a feed passage connected to a rear end of said air chamber, said valve connection portion being integrally formed with and 15 extending downwardly from a bottom side of said tubular body portion, said valve connection portion having a valve connecting hole, said air passageway portion being integrally formed with and extending downwardly from said bottom side of said tubular body portion and 20 said valve connection portion, and having an air passageway in fluid communication with said valve connecting hole and said air chamber, said feed connection portion being integrally formed with and extending upwardly from a top side of said tubular body 25 portion, and having a feed inlet hole in communication with said feed passage, said nozzle being received in said spray cap and having a nozzle tip extending into said cap opening, said nozzle fluidly communicating said feed passage and fluidly disconnecting said air chamber; a spray unit including a spray needle that extends 5 in said feed passage and said nozzle tip, said spray needle being movable axially within said tubular body portion between a non-delivery position, where said spray needle closes said nozzle tip, and a delivery position where said spray needle opens said nozzle tip; 10 an air valve unit connected to said valve connection portion, said air valve unit being transitionable between a closing state where said air valve unit has no fluid communication with said valve connecting hole, and an opening state where said air 15 valve unit is in communication with said valve connecting hole; and an operation unit disposed on said gun body, said operation unit driving said spray needle to move between the non-delivery position and the delivery position, 20 and actuating said air valve unit to transition between the closing state and the opening state.
2. The paint spray gun as claimed in Claim 1, wherein: said gun unit further includes a spring cap disposed in a tubular rear end of said tubular body 25 portion; said tubular body portion further has a needle operating space disposed rearwardly of said feed passage and opening at said tubular rear end; said spray unit further includes a needle sleeve sleeved on said spray needle and disposed in said needle 5 operating space, and a first resilient member that is disposed in said spring cap and around said spray needle and that abuts said needle sleeve; and said first resilient member provides a pushing force to move forwardly said needle sleeve which brings 10 said spray needle to the non-delivery position.
3. The paint spray gun as claimed in Claim 2, wherein: said gun unit further includes a stop member disposed in said needle operating space in front of said spring cap; 15 said gun body further has a trigger connection portion that is integrally formed with and extends upwardly from said top side of said tubular body portion; said operation unit includes a slide member that 20 is sleeved around said spray needle forwardly of said needle sleeve and that is slidable within said needle operating space, a trigger that is pivotally connected to said trigger connection portion and that is engageable with said slide member, and a second 25 resilient member disposed in abutment between said slide member and said stop member.
4. The paint spray gun as claimed in Claim 3, wherein: said gun unit further has a gasket receiving passage disposed between said feed passage and said needle operating space, a feed passage gasket disposed 5 within said gasket receiving passage to seal said feed passage from said needle operating space, and a limit ring that is secured within said gasket receiving space to position said feed passage gasket; and said spray needle extends through said limit ring 10 and said feed passage gasket.
5. The paint spray gun as claimed in any one of Claims 3 or 4, wherein: said air valve unit includes a valve housing that is connected to said 15 valve connecting hole and that has an air supply valve passage, a valve shaft that extends through said air supply passage of said valve housing into said needle operating space of said tubular body 20 portion, a stopper seal ring sleeved around said valve shaft, and a valve spring disposed in said air supply valve passage and abutting said valve housing and 25 said valve shaft to urge said valve shaft to move into said needle operating space.
6. The paint spray gun as claimed in Claim 5, wherein said valve housing further has a valve seat formed around said valve shaft, said valve shaft having a 5 stopper portion proximal to said valve seat, said stopper seal ring being sleeved on said stopper portion.
7. The paint spray gun as claimed in any one of Claims 5 or 6, wherein: said slide member has a valve-actuating push surface in contact with an end of said valve shaft 10 extending into said needle operating space.
8. The paint spray gun as claimed in any one of Claims 5 to 7, wherein: said tubular body portion further has a valve shaft passage disposed between said needle operating space 15 and said valve connecting hole of said valve connection portion, and a middle hole disposed between said valve shaft passage and said valve connecting hole, said middle hole having a cross section larger than said valve shaft passage and smaller than said valve 20 connecting hole; said air valve unit further includes a valve gasket disposed within said middle hole, a packing plate that is disposed within said 25 valve connecting hole and abuts said valve gasket, a compression spring that abuts said packing plate and said valve housing; and said valve shaft extends through said 5 compression spring, said packing plate, said valve gasket and said valve shaft passage from said air supply passage into said needle operating space.
9. The paint spray gun as claimed in Claim 4, wherein each of said first resilient member and said second 10 resilient member is a compression spring.
10. The paint spray gun as claimed in any one of Claims 1 to 9, further comprising a paint cup connected to said paint connection portion of said gun body.
11. The paint spray gun as claimed in any one of Claims 15 1 to 10, wherein said tubular body portion further has a feed tube that is disposed in said air chamber and said feed passage, said nozzle further having a nozzle rear end that is opposite to said nozzle tip and that fluidly connects a front end of said feed tube, a rear 20 end of said feed tube fluidly communicating said feed passage, said feed tube fluidly disconnecting said air chamber.
12. The paint spray gun as claimed in any one of Claims 1 to 11, wherein said gun body is made from an aluminum alloy.
13. The paint spray gun as claimed in claim 1, substantially as herein described, with reference to any embodiment disclosed.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW107120558 | 2018-06-14 | ||
TW107120558A TWI670120B (en) | 2018-06-14 | 2018-06-14 | Artistic spray gun |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ751727A NZ751727A (en) | 2020-02-28 |
NZ751727B true NZ751727B (en) | 2020-05-29 |
Family
ID=
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