F ield of Invention

The present invention relates to electrostatic spray guns and more particularly to a replaceable high-voltage power cartridge for the electrostatic spray gun.

¾ Background of the Invention

Powder coating is a surface coating method for goods or parts thereof, using a dry powder. It is a dry finishing process that uses a thermo- plastic or a thermo-set polymer. Powder coating has a wide range of applications in various industries such as automotive, aerospace, architectural, marine, hardware and the like. The powder 3 coati ng method assures I ong I asti ng durabi I i ty of a product.

Generally, the powder coating is carried out by various methods including a fluidized powder bed dipping, electrostatic fluidized bed, flocking and the likes. The most commonly used powder coating method is an electrostatic spray application system wherein non-conductive powders are used in the coating process such that the parts to ¾ be coated are grounded neutral so that the charged particles projected at them adhere to the parts and are held in position until melted and fused into the curing oven to faci I itate smooth fi nishi ng to the surfaces of the parts to be coated.

The electrostatic spray application systems are commonly used for electrostatic spraying. The function of the electrostatic spray gun is to shape and direct flow of a powder. These guns help in controlling the shape and size of a spray pattern and additionally impart an electrostatic charge to the powder. These guns include delivery and charging systems which control efficiency of powder deposition during the coating process. The delivery system sucks and transports the powder from the container to the gun tip and the charging system charges the powder material so as to stick to the surface until it is cured. It is achieved by pneumatic controls and voltage ¾ control.

The prior art spraying gun techniques focus on improving charging capacity of the spray guns. However, a high-voltage multiplier including transformer plays an important role in powder deposition in such spraying guns. It is well known that if the high-voltage multiplier fails, the electrostatic spray gun becomes inoperable and 3 hence, needs to be replaced by a new spray gun. Further, the operator may require shutting down operations if a back-up spray gun is not available. There are some spray guns are available that allows to replace the high-voltage multiplier by a new high- voltage multiplier. However, replacement of the high- voltage multiplier of the presently available guns is a time consuming, tedious and expensive.

¾ The high-voltage multiplier generates up to 120 kilovolts (kV ) in some applications, provides a high-voltage, low current electric signal to the electrodes of the gun. This voltage ionizes the air around the electrodes, thereby producing charged air particles. As powder passes through the gun, the ions attach themselves to the powder particles, thereby forming charged powder particles. The charged powder particles travel tfl toward the grounded work piece and coat the work piece. The coated work piece is then heated in a curing oven so that the powder melts and forms a uniform coating on the work piece. Therefore, the high-voltage generator plays a vital role in the powder coating gun in providing for the efficient deposition of powder on the work pieces. The high-voltage generator typically consists of a transformer followed by a cascade of capacitors and di odes whi ch form a voltage multi pi i er. T he transformer receives an i nput voltage, for

¾ example, zero to sixteen V olts (V) alternating current (AC), and steps it up to an intermediate level of approximately two to seven kilovolts (kV) AC or more.. The intermediate level voltage is then provided to the voltage multiplier, where it is stepped up many fold, to a final voltage of approximately 120 kV DC, for example. This final voltage is normally varied, as required, during the coating process by varyi ng the i nput voltage to the transformer.

The high-voltage multiplier consists of several stages of capacitors and diodes which can produce either a positive or negative voltage at the electrodes of the gun depending on the particular application. Typically, the stages of the high-voltage multiplier are insulated in a potting compound in order to prevent arcing between¾ components.

However, due to external factors such as voltage fluctuations or overheating, the high- voltage multiplier fails. In such a scenario, the spray gun is rendered useless even if the other components of the spray gun are in usable condition, and hence needs to be replaced, which is expensive. In factories with high usage of the spray guns, the manufacturing chain is halted due to the failure of the spray painting equipment, such as the spray guns. This results into monetary losses.

Therefore, there is a need of means that allows the operator to start his operations, in the event of circuit failure of the spray gun, at least cost and in less time. Summary of the Invention

Accordingly, the present invention provides in one or more embodiments a replaceable high-voltage power cartridge and an electrostatic spray gun having the replaceable high-voltage power cartridge.

¾ In an embodiment of the present invention, a replaceable high-voltage power cartridge is provided. The replaceable high-voltage power cartridge is adapted in a handle portion of an electrostatic spray gun. The replaceable high-voltage power cartridge includes a transformer, a primary voltage multiplier stage, and one or more connectors. The transformer receives a low voltage supply and steps up the low

3 vol tage suppl y to generate a f i rst i ntermedi ate vol tage. T he pri mary vol tage mul ti pi i er stage is connected to the transformer through a safety circuit. The primary voltage multiplier stage receives the first intermediate voltage and generates a second intermediate voltage which is greater than the first intermediate voltage. The connector(s) connect the replaceable high-voltage power cartridge to a secondary

¾ voltage multiplier stage of a cascade module in a barrel portion of the electrostatic spray gun. The secondary voltage multiplier stage receives the second intermediate voltage and generates a high voltage for creating an electrostatic field at a tip of the electrostatic spray gun.

In another embodiment of the present invention, an electrostatic spray gun is provided. The electrostatic spray gun includes a handle portion and a replaceable barrel portion. The handle portion includes a replaceable high-voltage power cartridge removably adapted therein. The replaceable high-voltage power cartridge includes a transformer, a primary voltage multiplier stage, and one or more connectors. The transformer receives a low voltage supply and steps up the low voltage supply to generate a first intermediate voltage. The primary voltage multiplier stage is connected to the transformer through a safety circuit. The primary voltage multiplier stage receives the first intermediate voltage and generates a second intermediate

¾ voltage. The replaceable barrel portion is removably attached to the handle portion.

The replaceable barrel portion includes one or more complementary connectors and a cascade module. The complementary connector(s) detachably connect to the connector(s) of the handle portion. The cascade module connects to the replaceable high-voltage power cartridge through the complementary connector(s). The cascade

3 module has a secondary voltage multi pi ier stage for receivi ng the second i ntermediate voltage and generating a high voltage for creating an electrostatic field at a tip of the electrostatic spray gun.

In an exemplary embodiment the safety circuit includes a resistor, an inductor, or a capacitor or a combination of one or more resistors, inductors or capacitors.

¾ In another exemplary embodiment, the primary voltage multiplier stage includes a capacitor or a diode or a combination of one or more capacitors and diodes.

In another exemplary embodiment, the connectors or the complementary connectors are one of pins, receptacles, wires, conductive brushes, or conductive plastics.

In another exemplary embodiment, the shapes of the replaceable high-voltage power cartridge and of the barrel portion of the electrostatic spray gun may be cubical, cylindrical, round, rectangular, spherical, or conical shapes. Brief Description of Drawings

While this invention is susceptible to embodiment in many different forms, there is shown in the drawings and will be herein described in detail one specific embodiment with the understanding that the present disclosure is to be considered an ¾ exemplification of the principles of the invention, and is not intended to limit the i nventi on to the embodi ment i 11 ustrated.

FIG. 1 is a schematic view of an electrostatic spray gun having a replaceable high- voltage power cartridge in accordance with an embodiment of the present invention;

FIG. 2 is a schematic dismantled view of the electrostatic spray gun of FIG. 1 in 3 accordance with an embodi ment of the present i nventi on;

FIG. 2A is a schematic exploded view of a handle of the electrostatic spray gun of FIG. 1 in accordance with an embodiment of the present invention;

FIG. 2B is a schematic exploded view of a cascade barrel of the electrostatic spray gun of FIG. 1 in accordance with an embodiment of the present invention;

¾ FIG. 3 is a schematic side view of a replaceable high-voltage power cartridge of the electrostatic spray gun of FIG. 1 in accordance with an embodiment of the present invention;

FIG. 3A is a schematic front view of a connector socket of the electrostatic spray gun of FIG. 1 in accordance with an embodiment of the present invention; FIG. 4 is a schematic view of a circuitry of the replaceable high-voltage power cartridge and a voltage multiplier circuitry of the electrostatic spray gun of Fig. 1;

FIG. 5 is a schematic view of an automatic electrostatic spray gun in accordance with an embodiment of the present invention;

¾ FIG. 6A is a schematic view of a manual single-body electrostatic spray gun in accordance with an embodiment of the present invention;

FIG. 6B is a schematic view of an automatic single-body electrostatic spray gun in accordance with an embodiment of the present invention; and

FIG. 6C is an exploded view of a replaceable high-voltage power cartridge used in the 3 manual and automatic electrostatic spray guns of FIGS. 5A and 5B respectively, in accordance with an embodiment of the present invention..

Detailed Description of the Invention

Although specific terms are used in the following description for the sake of clarity, these terms are intended to refer only to the particular structure of the invention ¾ selected for illustration in the drawings, and are not intended to define or limit the scope of the invention.

The present invention provides a replaceable high-voltage power cartridge and an electrostatic spray gun having the replaceable high-voltage power cartridge.

In an embodiment of the present invention, a replaceable high-voltage power cartridge is provided. The replaceable high-voltage power cartridge is adapted in a handle portion of an electrostatic spray gun. The replaceable high-voltage power cartridge includes a transformer, a primary voltage multiplier stage, and one or more connectors. The transformer receives a low voltage supply and steps up the low voltage supply to generate a first intermediate voltage. The primary voltage multiplier

¾ stage is connected to the transformer through a safety circuit. The primary voltage multiplier stage receives the first intermediate voltage and generates a second intermediate voltage which is greater than the first intermediate voltage. The connector(s) connect the replaceable high-voltage power cartridge to a secondary voltage multiplier stage of a cascade module in a barrel portion of the electrostatic

3 spray gun. The secondary voltage multiplier stage receives the second intermediate voltage and generates a high voltage for creating an electrostatic field at a tip of the electrostatic spray gun.

In another embodiment of the present invention, an electrostatic spray gun is provided. The electrostatic spray gun includes a handle portion and a replaceable ¾ barrel portion. The handle portion includes a replaceable high-voltage power cartridge removably adapted therein. The replaceable high-voltage power cartridge includes a transformer, a primary voltage multiplier stage, and one or more connectors. The transformer receives a low voltage supply and steps up the low voltage supply to generate a first intermediate voltage. The primary voltage multiplier stage is connected to the transformer through a safety circuit. The primary voltage multiplier stage receives the first intermediate voltage and generates a second intermediate voltage. The replaceable barrel portion is removably attached to the handle portion. The replaceable barrel portion includes one or more complementary connectors and a cascade module. The complementary connector(s) detachably connect to the connector(s) of the handle portion. The cascade module connects to the replaceable high voltage power cartridge through the complementary connector(s). The cascade module has a secondary voltage multiplier stage for receiving the second intermediate ¾ voltage and generating a high voltage for creating an electrostatic field at a tip of the electrostatic spray gun.

The safety circuit may include a resistor, an inductor, or a capacitor or a combination of one or more resistors, inductors or capacitors. The primary voltage multiplier stage may include a capacitor or a diode or a combination of one or more capacitors and 3 diodes. Examples of the connectors or the complementary connectors include, but are not restricted to, pins, receptacles, wires, conductive brushes, and conductive plastics. Examples of the shapes of the replaceable high-voltage power cartridge and of the barrel portion of the electrostatic spray gun include, but are not limited to, cubical, cylindrical, round, rectangular, spherical, or conical shapes.

¾ The replaceable high-voltage power cartridge of the electrostatic spray gun is easily replaceable in the event of circuit failure. The replaceable high-voltage power cartridge eliminates unnecessary repairs, and improves efficiency and throughput of the operator. Moreover, the replaceable high- voltage power cartridge may be easily adapted to the existing spray systems.

According to the present invention, the replaceable high-voltage power cartridge may contain the high voltage transformer, safety resistor and one or more primary voltage multiplier stages formed by capacitors and diodes. Alternatively, the replaceable high voltage power cartridge may contain only the transformer and the safety circuit. Referring FIG. 1 shows an electrostatic spray gun assembly 100 in accordance with an embodiment of the present invention. The electrostatic spray gun assembly 100 includes a handle 110, a replaceable high-voltage power cartridge 120, a connector ring 130, a cascade barrel 140, a muzzle holding cap 150, a muzzle nozzle 160 and a ¾ gun tip 170.

The handle 110 assists the operator to hold the electrostatic spray gun 100 for performing spraying operation. The replaceable high-voltage power cartridge 120 is positioned preferably at the upper portion of the handle 110. The handle 110 and the replaceable high-voltage power cartridge 120 are connected to a first end of the 3 cascade barrel 140 via the connector ring 130. The cascade barrel 140 has a second end that is connected to the muzzle nozzle 160. The muzzle nozzle 160 contains the gun tip 170 via the muzzle holding cap 150.

Referring FIGS. 2 and 2A show an exploded view of the electrostatic spray gun handle 110 in accordance with an embodiment of the present invention. The handle ¾ 110 includes a handle slider 210, a main body 220, a rear cap 230, and the replaceable high-voltage power cartridge 120. The handle slider 210 includes a connecting wire system 211 and a powder nozzle 212 that pass through the main body 220. The handle slider 210 integrates with the main body 220 via an inner pipe 221. A trigger system 223 is positioned on the main body 220. The main body 220 connects to the connector ring 130 through an elbow 222 passing through the main body 220. The replaceable high-voltage power cartridge 120 is positioned at an upper portion of the handle 110 and preferably covered by a rear cap 230. Referring FIG. 2B shows an exploded view of the cascade barrel 140 in accordance with an embodiment of the present invention. The cascade barrel 140 has a first end includes a plurality of high-voltage connectors 241 that connect to the connector ring 130. The connectors 241 are selected from wires, pins, conductive brushes,

¾ conductive plastics and the like. The connectors 241 establish contact with the replaceable high-voltage power cartridge 120 and the rest of the voltage multiplier cascade barrel 140 via the connector ring 130. The cascade barrel 140 connects to the handle 110 through the connector ring 130. The cascade barrel 140 has a second end that connects to the muzzle nozzle 160 to the muzzle holding cap 150 thereby safely

3 distributing the high voltage to the air and keeping in place the muzzle nozzle 160 in front of the cascade barrel 140.

In accordance with a preferred embodiment, the replaceable high-voltage power cartridge 120 includes a primary voltage multiplier stage of a high-voltage multiplier circuit and the cascade barrel 140 includes one or more secondary voltage multiplier ¾ stages of the high-voltage multiplier circuit. The high-voltage multiplier circuit includes a plurality of high voltage capacitors, high voltage diodes and resistors.

In this one embodiment, the cascade barrel 140 has a cylindrical shape. However, the shape of the cascade barrel 140 may have a shape selected from conical, cylindrical, rectangular, and cubical and the like without departing from the scope of the invention.

Referring FIG. 3 shows a side view of a replaceable high-voltage power cartridge 120 of the electrostatic spray gun assembly 100 in accordance with an embodiment of the present invention. In this one preferred embodiment, the replaceable high-voltage power cartridge 120 contains a high-voltage transformer, a safety circuit, and a primary voltage multiplier stage. The primary voltage multiplier stage includes a first stage capacitor and a diode of the high-voltage multiplier circuit.

In an example, the primary and secondary stages of the high-voltage multiplier circuit ¾ include a plurality of stages of capacitors and diodes which can produce either a positive or negative voltage at the electrodes of the gun depending on the particular applications thereof. Further, the safety circuit included in the replaceable high- voltage power cartridge 120 may include safety resistors. The safety circuit may also include one or more other electronic components such as inductors, capacitors, or 3 diodes.

It may be apparent to a person of ordinary skill in the art that the replaceable high- voltage power cartridge 120 is not limited to a single primary voltage multiplier stage, and hence, may include one or more primary voltage multiplier stages. In a preferred embodiment of the present invention, the replaceable high- voltage power cartridge ¾ 120 i ncl udes three pri mary voltage stages al ong with a high-voltage transformer and a safety circuit.

The cascade barrel 140 has the connectors 241 at the first end and the replaceable high-voltage power cartridge 120 has complementary connectors (not shown) that are attachable to the connectors 241 through the connecting ring 130. The connectors 241 are fixedly connected to the secondary voltage multiplier stage in the cascade barrel 140 and the complementary connectors are fixedly connected to the primary voltage multiplier stage of the replaceable high-voltage power cartridge 120. The complementary connectors may be similar to the connectors 241. Examples of the complementary connectors include wires, pins, conductive brushes, conductive plastics and the like.

In an exemplary embodiment, the connector 241 has a conducting receptacle and a conducting spring in the conducting receptacle. The conducting spring has one end

¾ fixed to the conducting receptacle. The other end of the conducting spring establishes contact with the complementary connector of the replaceable high- voltage power cartridge 120, thereby establishing electric contact between the primary voltage multiplier stage in the replaceable high-voltage power cartridge 120 and the secondary voltage multiplier stage in the cascade barrel 140. In an example, the

3 complementary connector is a snap-fit connector with a bulbous end. The complementary connector further has a slit in the bulbous end for establishing the contact with the conducting receptacle and the conducting spring of the connector 241

It may be understood to a person of ordinary skill in the art that the structures of the connectors 241 and the complementary connectors are interchangeable and may be ¾ modified according to the electrical requirements of the electrostatic spray gun assembly 100. Further, the connectors 241 and the complementary connectors may be replaced by a distinct connector assembly that provides electrical connection between the replaceable high-voltage power cartridge 120 and the cascade barrel 140.

The connecting ring 130 encloses the connectors 241 and the complementary connectors. This avoids exposure of the connectors 241 and the complementary connectors to the external atmosphere. Further, the abovementioned conducting spring and conducting receptacle may be recessed at a certain depth in the connector 241 and the complementary connector, respectively, thereby avoiding the risk of providing shock to the operator of the electrostatic spray gun assembly 100.

In an alternative embodiment of the present invention, the replaceable high-voltage power cartridge 120 may contain the high- voltage transformer and only first stage ¾ capacitor of the high-voltage multiplier circuit or may contain the high-voltage transformer, the safety resistor and a plurality of stages of the capacitors and diodes of the high-voltage multiplier circuit.

Referring FIG. 3A shows a front view of a connector socket of the electrostatic spray gun assembly 100 in accordance with an embodiment of the present invention. The 3 replaceable high-voltage power cartridge 120 contains connector sockets 310. The connector sockets 310 may be selected from wires, pins, conductive brushes, conductive plastics, or other known electrical connection means.

Referring FIG. 4 shows a schematic view of the replaceable high-voltage power cartridge 120 and the high-voltage multiplier circuit 400 in accordance with an ¾ embodiment of the present invention. The high-voltage multiplier circuit 400 is housed in the electrostatic spray gun assembly 100 in order to avoid the need for a stiff, cumbersome high-voltage cable leading from a high-voltage source to the spray gun assembly 100.

The high-voltage multiplier circuit 400 is split into two circuits, namely a primary voltage multiplier stage and one or more secondary voltage multiplier stages. The primary voltage multiplier stage includes a primary capacitor and a primary diode that is linked and fixedly connected to a high voltage transformer. Thus, the replaceable high-voltage power cartridge 120 is formed by the high-voltage transformer and the first stage capacitor and diode of the high-voltage multiplier circuit 400. The replaceable high-voltage power cartridge 120 is removably connected to the second stage, which includes a secondary capacitor and a secondary diode combination which ¾ i s i ncorporated i nsi de the cascade barrel 140.

The high-voltage multiplier circuit 400 employs a cascade of voltage capacitors and diodes which serve to increase an intermediate voltage of 2 -7 KV AC to a final voltage of 120 KV DC, for instance. The high-voltage capacitors work as voltage multipliers and the diodes, by allowing current to pass in only one direction, work to

3 provide the direct current output. The diodes in the voltage multiplier circuit 400 allow the capacitors to repeatedly charge and discharge. The total charge of the multiple stages is an addition of the charge held by each stage. The cascade of diodes and capacitors forms a rectifying circuit. The rectifying circuit converts the AC output of the transformer to a high voltage DC output. This high-voltage output is supplied

¾ directly to the electrodes in the muzzle nozzle 160 positioned at the tip of the spray gun assembly 100, thereby providing an ionized field for charging the coating powder which is subsequently expelled through the tip 170 of the spray gun assembly 100 and directed toward a work piece.

The replaceable high-voltage power cartridge 120 includes the high-voltage transformer and a primary stage capacitor and/or a diode of the high-voltage multiplier circuit 400. The first stage capacitor in the replaceable high-voltage power cartridge 120 couples the transformer to the voltage multiplier cascade. The contact between the transformer cum capacitor section and the rest of the voltage multiplier cascade may be made by contacting means such as pins, wires and the like.

It may be understood to a person of ordinary skill in the art that the replaceable high- voltage power cartridge 120 can be used in automatic electrostatic spray guns as well ¾ in manual electrostatic spray guns. Further, the replaceable high-voltage power cartridge 120 can be used in multi-body electrostatic spray guns which have separate handle and barrel portions as well as in single-body electrostatic spray guns which do not have separate handle and barrel portions.

FIG. 5 is a schematic view of an automatic electrostatic spray gun 500 in accordance 3 with an embodiment of the present invention. The automatic electrostatic spray gun 500 includes a handle 111, the replaceable high-voltage power cartridge 120 removably adapted within the handle 111, the cascade barrel 140, connector ring 130, the muzzle holding cap 150, the muzzle nozzle 160, and the tip 170.

Referring FIG. 6A shows a schematic view of a manual single-body electrostatic ¾ spray gun 620 in accordance with an embodiment of the present invention. The manual single-body electrostatic spray gun 620 includes the replaceable high-voltage power cartridge 120 and the cascade barrel 140. The replaceable high-voltage power cartridge 120 is removably attached in a handle portion 622 of the manual single- body electrostatic spray gun 620. The cascade barrel 140 is located in a barrel portion 624 of the manual single- body el ectrostati c spray gun 620. In an embodiment of the manual single- body electrostatic spray gun 620, the handle portion 622 and the barrel portion 624 are together integrated to form a single body of the manual single- body electrostatic spray gun 620.

Referring FIG. 6B shows a schematic view of an automatic single-body electrostatic ¾ spray gun 640 in accordance with an embodiment of the present invention. The automatic single-body electrostatic spray gun 640 includes the replaceable high- voltage power cartridge 120 and the cascade barrel 140. The replaceable high-voltage power cartridge 120 is removably attached in a handle portion 642 of the automatic single- body electrostatic spray gun 640. The cascade barrel 140 is located in a barrel 3 porti on 644 of the automati c si ngl e- body el ectrostati c spray gun 640.

In an embodiment of the automatic single- body electrostatic spray gun 640, the handle portion 642 and the barrel portion 644 are together integrated to form a single body of the automatic single- body electrostatic spray gun 640.

Therefore, from FIGS. 6A and 6B, it may be well understood to a person of ordinary ¾ skill in the art that the replaceable high-voltage power cartridge 120 is equally and fully operable in such a single body construction of any electrostatic gun.

FIG. 6C is an exploded view of the replaceable high-voltage power cartridge 120 used in the manual and automatic electrostatic spray guns 620 and 640 of FIGS. 6A and 6B respectively, in accordance with an embodiment of the present invention.

Referring to FIGS. 1-6, in operation, the replaceable high-voltage power cartridge 120, containing the high-voltage transformer and first stage capacitor and diode, may be easily and inexpensively replaced with a spare or new power cartridge 120. In an initial step, the rear cap 230 of the gun handle 110 is opened, followed by disconnecting the existing wires and pulling out the existing replaceable high-voltage power cartridge 120. In the next step, the new replaceable high-voltage power cartridge 120 is replaced and the electrical wires are disconnected.

¾ It is understood, however, that the cascade barrel 140 need not be disconnected from the electrostatic spray gun assembly 100 during said replacement process. It is further understood here that the voltage multiplier is restored to its normal operation and the electrostatic spray gun assembly 100 may be continued to be used by allowing the operator to be able to easily replace the failed primary capacitor of the voltage

3 multiplier that is housed in the replaceable high-voltage power cartridge 120 by a fresh primary capacitor housed in another power cartridge.

The replaceable high- voltage power cartridge 120 of the electrostatic spray gun assembly 100 eliminates the need of replacement of the spray gun on the failure of the circuit. The replaceable high-voltage power cartridge 120 of the electrostatic spray ¾ gun assembly 100 of the present invention is long lasting, durable and economical.

The replaceable high- voltage power cartridge 120 of the electrostatic spray gun assembly 100 is compatible to be used with the existing spray guns. The replaceable high- voltage power cartridge 120 of the electrostatic spray gun assembly 100 is quickly and easily replaceable with the existing power cartridge in order to save the effective processing time and efforts of the operator. The electrostatic spray gun assembly 100 is made non-bulky and light-weight in order to reduce fatigue of the operator. Therefore, the replaceable high-voltage power cartridge 120 overcomes the drawbacks faced by the electrostatic spray guns of the abovementioned prior-art. Further, the function of the replaceable high-voltage power cartridge 120 is independent of the physical characteristics of the electrostatic spray guns within which the replaceable high-voltage power cartridge 120 is removably adapted. Therefore, the replaceable high-voltage power cartridge 120 is equally functional in various types of spray guns.

The foregoing description of the invention has been set merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the substance of the invention may occur to person skilled in the art, the invention should be construed to include everything within the scope of the disclosure.