CROSS-REFERENCE STATEMENT

This application claims the benefit of U.S. Provisional Application No. 61/387,486, filed September 29, 2010, the entire content of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to an applicator for dispensing pressurized fluids and a method for using such an applicator.

Description of Related Art

Spray polyurethane foam (SPF) is useful for sealing air leaks in building structures and for providing thermal insulation to building structures. SPF formulation is generally available under pressure in a container and upon dispensing the SPF formulation the formulation expands into SPF. Dispensing SPF from a pressurized container requires use of a flow regulating applicator that is often in the form of a gun-like device having an extension component (for example, the gun barrel) and a trigger mechanism for actuating flow of the SPF through the extension component.

One particularly desirable flow regulating applicator design has an extension component comprising a straight hollow tube that has a rod-like piston (piston rod) extending through the inside of the tube with space between the piston rod and inside wall of the hollow tube through which SPF formulation can flow during dispensing. The piston rod generally has a spring holding it in a position sealing the dispensing end of the hollow tube to prevent SPF flow. Pulling a trigger retracts the piston from the dispensing end of the tube and SPF formulation flows out from the dispensing end of the flow regulating applicator. SPF formulation flow ceases upon releasing the trigger, allowing the spring to return the piston rod to its location sealing the dispensing end of the hollow tube. It is beneficial to use a dispensing wand that seals SPF formulation flow at the dispensing end of the applicator as opposed to, for example, the entrance end so that SPF formulation in the hollow tube can remain isolated from moisture and air and under pressure to prevent foaming or curing within the hollow tube. By sealing the applicator at the dispensing end of the hollow tube, the applicator is reusable without concern that the SPF formulation will cure and plug up the hollow tube.

Current designs for SPF flow regulating applicators are typically in the form of guns with straight extension components. See, for example, United States patents 5,271,537 and 5,683,544 and European patent application EP0903211A2. The straight extension component enables unencumbered actuation of the piston inside of the hollow tube to initiate and cease dispensing of SPF formulation as well as to facilitate direct line-of-sight application of SPF formulation. Nonetheless, straight dispensing wands are not especially conducive for applying SPF formulation to locations that are not in direct view, such as in band joists (also known as rim joists) and tight spaces where positioning the flow regulating applicator along a direct line-of-sight is not easy or possible. It is desirable to have a flow regulating applicator suitable for dispensing SPF formulation that does not require positioning the entire flow regulating applicator along a line-of-sight with the target SPF location but that still utilizes a piston rod inside a hollow tube to seal the flow of SPF formulation at the dispensing end of the applicator.

BRIEF SUMMARY OF THE INVENTION

The present invention provides a solution to the problem of providing a flow regulating applicator suitable for dispensing liquids such as SPF formulations that does not require positioning the entire flow regulating applicator along a line-of-sight with the target SPF location but that still utilizes an actuated piston inside of a hollow tube. Surprisingly, the flow regulating applicator of the present invention has a bent extension component through which a piston rod can still reversibly retract and then reposition so as to open and the reseal the extension component for controlled application of fluid in out-of-sight locations. Research on flow regulating applicators utilizing piston rod in a hollow tube has revealed suitable characteristics necessary for a bent flow regulating applicator that enables dispensing SPF formulation to areas out of sight from an operator of the flow regulating applicator and yet that enjoys the benefits of an actuated piston rod operating in a hollow tube.

In a first aspect, the present invention is a flow regulating applicator comprising an extension component and a trigger mechanism, the extension component comprising: (a) a hollow tube having an open entrance end, an opposing open dispensing end, an inside diameter and an outside diameter; and (b) a piston rod extending through the entrance end and extending within the hollow tube, the piston rod having an outside diameter that is less than the inside diameter of the hollow tube so as to leave a space between the hollow tube and piston rod inside the hollow tube; and the trigger mechanism comprising: (i) an elastic force mechanism providing an elastic force to the piston rod that directs the piston rod towards the dispensing end of the hollow tube wherein the piston rod seals the opening at the dispensing end of the hollow tube under the elastic force; and (ii) a trigger that, upon activating the trigger, moves the piston rod away from the dispensing end of the hollow tube against the elastic force and upon deactivating the trigger the elastic force mechanism repositions the piston rod so as to seal the dispensing end of the hollow tube; wherein, the hollow tube and piston rod of the extension component have one or more bend so as to create an angle of ten degrees or more as measured between a cross sectional plane containing the hollow tube cross section containing the entrance to the hollow tube and a cross section plane containing the hollow tube cross section containing the dispensing opening of the hollow tube and wherein one or more bend in the piston rod extends through one or more bend in the hollow tube and wherein any bend in the hollow tube where the piston rod extends through has a radius of curvature that is at least 1.25 times the outside diameter of the of the hollow tube at the bend.

In a second aspect, the present invention is a method for dispensing a liquid comprising the following steps: (a) providing the flow regulating applicator of Claim 1; (b) providing a pressurized liquid into the entrance end of the hollow tube; (c) activating the trigger mechanism so as to retract the piston rod from the dispensing end of the hollow tube thereby opening the dispensing end of the hollow tube and allowing the pressurized liquid to travel through the hollow tube and out from the dispensing end.

The flow regulating applicator of the present invention is useful for dispensing pressurized fluid, particularly SPF formulation, in accordance with the method of the second aspect of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 provides top and side cut-away views of a flow regulating applicator within the scope of the present invention. DETAILED DESCRIPTION OF THE INVENTION All ranges include endpoints. "And/or" means "and, or as an alternative". "Cross section" refers to a section formed by a plane cutting through an object at a right angle to its longest axis. "Cross sectional plane" refers to a plane forming a cross section. "Cross sectional dimension" is a dimension that lies on a cross section.

The applicator of the present invention comprises two portions: an extension component and a trigger mechanism. The applicator can, and typically does comprise further components, such as a handle, but does not require additional components in the broadest scope of the invention.

The extension component serves to direct flow of a pressurized liquid from a supply source, such as a pressurized tank, to an application destination. The extension component comprises a hollow tube with opposing open ends. One end is the entrance end that has an opening (entrance) and the opposing end is the dispensing end with an opening (dispensing opening). The hollow tube can be of any cross sectional shape although it is typically cylindrical with a round cross section. The hollow tube has an inside and an outside diameter. Typical inside diameters for the hollow tube are in a range of 1.5 to 20 millimeters. The hollow tube can taper and narrow at the dispensing end to define an opening at the dispensing end that has a smaller inside diameter than the rest of the hollow tube. For example, the hollow tube apart from any taper at the dispensing end typically has an inside diameter in a range of three to 20 millimeters while the diameter of the opening at the dispensing end can have an inside diameter in that same range, or preferably, in a range of 1.5 to 6.5 millimeters.

The hollow tube can be a single structure or comprise multiple connected components. For example, it is common for the hollow tube to include a removable tip that defines the dispensing end and dispensing opening of the hollow tube. Such a removable tip can screw onto the remaining portion of the hollow tube and in combination define the hollow tube.

The extension component further comprises a piston rod extending within the hollow tube. The piston rod extends through the entrance end of the hollow tube and extends lengthwise inside the hollow tube. The piston rod is long enough to extend all the way to the dispensing end of the hollow tube. As with the hollow tube, the piston rod can have any cross sectional shape however it desirably has a cross sectional shape similar to the inside of the hollow tube. The piston rod has an outside diameter that is smaller in dimension than the inside diameter of the hollow tube. The outside diameter of the piston rod is sufficiently smaller than the inside diameter of the hollow tube so as to allow fluid to flow around the piston rod within the hollow tube. Ideally, any cross section of the extension component has a space inside the hollow tube, other than that occupied by the piston rod, that is at least 30 square millimeters so as to allow for adequate flow of fluid through the hollow tube and around the piston rod. Generally, the piston rod has an outside diameter that is three millimeters or more. If the piston rod has an outside diameter less than three millimeters it can undesirably deform during operation and become unable to form a seal at the dispensing end of the hollow tube. The piston rod is generally solid as opposed to hollow like the hollow tube in order to maximize its structural integrity.

"Diameter" as used in the context of the inside and outside diameter of the hollow tube and piston rod refers to the average of the largest and smallest cross sectional dimensions extending through the centroid of a cross section of the hollow tube or piston rod. Cross sectional dimensions for determining the outside diameter are straight lines that lie on a cross sectional plane and connect two points on the outside surface of the article in reference (that is, the hollow tube of piston rod). Cross sectional dimensions for determining the inside diameter of the hollow tube are straight lines that lie on a cross section of the hollow tube, connect two points on the inside surface of the hollow tube and extend through the centroid of the cross section of the tube.

The piston rod is designed so as to be able to reversibly seal the dispensing end of the hollow tube so fluid under pressure within the hollow tube cannot escape through the dispensing end when in the piston rod is in a sealing position. A generally desirable design for the piston rod and hollow tube that facilitates reversible sealing of the dispensing end of the hollow tube is for the hollow tube, and optionally the piston rod, to taper at the dispensing end so that the inside diameter of the hollow tube is equal to or less than the outside diameter of the piston rod end that is most proximate to the dispensing end. Even more desirable is for the end of the piston rod most proximate to the dispensing end of the hollow tube to have a shape and contour that mates with the inside wall shape of the hollow tube at the dispensing end so when sealing of the hollow tube is desired the piston rod fits into the hollow tube contour and mates to form a seal. Prior art contains teaching on designs for mating a piston rod so as to reversibly seal the end of the hollow tube. Suitable designs include use of a frustoconical valve tip on the piston rod that seats into a mating valve seat that the hollow tube around the dispensing opening defines. For such a design see, for example, United States patent 5,271,537 {see, Figures 1 and 2 and teaching in column 5, lines 37-45; incorporated herein by reference). United States patent 5,683,544 (incorporated herein by reference in its entirety) discloses another suitable design for a piston rod and hollow tube assembly that provides for mating of the piston rod so as to reversibly seal the hollow tube assembly from fluid flow.

The hollow tube and the piston rod can be the same material or different materials. Typically, the piston rod and/or the hollow tube are metal and more typically steel, brass or a combination thereof.

The flow regulating applicator further comprises a trigger mechanism. The trigger mechanism comprises an elastic force mechanism and a trigger. The elastic force mechanism provides an elastic force to the piston rod that directs the piston rod towards the dispensing end of the hollow tube. The elastic force mechanism typically includes a spring that provides the elastic force directing the piston rod into a sealing position at the dispensing end of the hollow tube. The elastic force mechanism allows for retracting the piston rod away from the dispensing end of the hollow tube against the elastic force of the elastic force mechanism. The elastic force can then reposition the piston rod towards the dispensing end of the hollow tube so as to seal the dispensing end. Suitable elastic force mechanisms are described, for example, in United States patent 5,271,537 {see, for example, column 5, line 66 through column 6, line 16 and Figure 1; incorporated herein by reference in its entirety).

A trigger is an object that upon application of a stimulus initiates stimulus to something else. The trigger of the present invention is in functional communication with the piston rod so that applying a stimulus to the trigger either retracts the piston rod from the dispensing end of the hollow tube against the elastic force of the elastic force mechanism and/or, if the piston rod is already in such a retracted position, enables the piston rod to reposition so as to seal the dispensing end of the hollow tube. For reference herein,

"activating" the trigger refers to applying a stimulus that initiates retracting of the piston rod against the elastic force of the elastic force mechanism and "deactivating" the trigger refers to releasing the activating stimulus or applying another stimulus on the trigger so as to enable the piston rod to reposition so as to seal the dispensing end of the hollow tube

A common form of trigger is a lever mechanism. Applying force to the lever mechanism trigger mechanically applies pressure to move the piston rod against the elastic force of the elastic force mechanism. For example, pulling on a trigger can force the piston rod to compress a spring as it retracts from the dispensing end of the hollow tube.

Releasing the force to the lever mechanism trigger deactivates the trigger and allows the elastic force to reposition the piston rod (for example, releasing the trigger allows the spring to expand and reposition the piston rod).

There are many forms and variations of triggers and trigger mechanisms that fall within the scope of the present invention. For example, the trigger mechanism can include a locking pin or clip that upon applying force to a lever mechanism trigger to retract the piston rod against an elastic force can lock the piston rod into the retracted position until force is applied to the trigger a second time or to a second trigger to release the lock to allowing the piston rod to return to a position sealing the dispensing end of the hollow tube. Examples of suitable triggers mechanisms are available in United States patents 5,271,537; 5,683,544; and 4,955,544 {see, for example, teaching on column 5, lines 6-20 and associated Figures; incorporated herein by reference).

Triggers can be electrical in nature as well as mechanical. For example, the trigger may be one or a combination of more than one button that upon pressing induces an electrical impulse that subsequently initiates retraction of the piston rod {for example, a button that upon depression sends an electrical impulse that causes a motor mechanism to run). An electrical trigger can be designed so that either releasing the button or pressing the button again, or even by pressing a separate button an electrical impulse reverses the motor and repositions the piston rod so as to seal the dispensing end of the hollow tube.

A characteristic feature of the present invention is one or more bend in the extension component (that is, in both the hollow tube and piston rod) so as to define an angle of ten degrees or more, preferably 30 degrees or more. Generally, the one or more bend defines an angle of 100 degrees or less, preferably 90 degrees or less. Most preferably, the one or more bend defines an angle in a range of 30 to 60 degrees. For clarity, the one or more bend corresponds to the piston rod having a bend within a portion of the hollow tube that also has a bend. Measure the angle defined by the one or more bend between a cross sectional plane containing a hollow tube cross section containing the entrance to the hollow tube and a cross sectional plane containing the hollow tube cross section containing the dispensing opening of the hollow tube. This characteristic feature enables the flow regulating applicator to dispose liquid in locations beyond view from an operator of the applicator. The curved extension component, for example, enables an operator to directly and efficiently dispose spray polyurethane foam formulation (hence, install spray polyurethane foam insulation) into the hidden locations of band joists or rim joists. Both the hollow tube and the piston rod of the extension component bend into the curve defined by the extension component. That means that the piston rod surprisingly still can reversibly move within the curved hollow tube. Discovering that the piston rod can still repeatedly retract and return into a sealing position even though the extension component bends ten degrees or more, even 30 degrees or more and preferably 30-60 degrees is a surprising discovery that is part of the inventive aspect of the present invention.

It is desirable that the extension component have a straight section extending zero centimeters or more, preferably 7.5 centimeters or more up to and including the dispensing end of the hollow tube. At the same time the straight section desirably extends 20 centimeters or less and preferably 15 centimeters or less and more preferably 13 centimeters or less up to and including the dispensing end of the hollow tube. Such a design allows the extension component to reach into tight hidden areas more easily than if there was a long (greater than 15 centimeter long) section leading up to and including the dispensing end.

Another characteristic feature of the present invention is that each bend in the extension component has a radius of curvature that is at least 1.25 times, preferably at least 1. 5, more preferably at least 1.75 times and most preferably at least two times the outside diameter of the hollow tube at the bend. Measure radius of curvature for a bend as the distance from the point where the cross sectional plane containing the entrance end and the cross sectional plane containing the dispensing end of the hollow tube intersect to the most proximate point on the hollow tube within the bend. Bending the extension component at a sharper radius than 1.25 times the hollow tube's outside diameter tends to kink the hollow tube, restrict reversible retracting and repositioning of the piston rod in the hollow tube, or both.

It is desirable to shape the extension component of the present invention by providing an essentially straight hollow tube with the piston rod extending within the hollow tube and then bending the hollow tube with the piston rod inside of it. Use of a pipe bending device is desirable to help avoid kinking of the hollow tube. It is also desirable to use a hollow tube that has a wall thickness of at least two millimeters, preferably 2.3 millimeters or more and still more preferably three millimeters or more, yet more preferably four millimeter or more and even more preferably five millimeter or more. Thicker walled tubing is less likely to kink during bending than thinner walled tubing. The flow regulating applicator can comprise features in addition to the extension component and the trigger mechanism. For example, the flow regulating applicator can comprise a handle to accommodate easy holding and use of the applicator.

The flow regulating applicator generally has one or more than one feature (receiving port) that enables flow of fluid from a source (for example, a pressurized tank) into the extension component. For example, there may be a means for connecting a pressurized tank directly or via tubing to the entrance of the hollow tube. There may be means for connecting a pressurized fluid container to portions of the hollow tube other than at the entrance end. For example, there may be ports that feed into the hollow tube along its length between the entrance end and the dispensing end. Ports and openings to the hollow tube that do not feed fluid into the hollow tube (other than the dispensing end) are desirably sealed during use of the flow regulating applicator so that fluid is directed out through the dispensing end.

Notably, tubing or conduit extending behind the entrance end of the hollow tube of the extension component (that is, extending in a direction opposite from the dispensing end) is distinct from the hollow tube of the extension component since the piston rod must extend through the entrance end of the hollow tube of the extension component. Likewise, ports or conduit intersecting the hollow tube between the entrance and the dispensing ends (for example, feed channels into the hollow tube) do not constitute part of the part of the hollow tube of the extension component since the piston rod does not extend within the intersecting conduit.

Figure 1 provides a top cutaway view and a cross-sectional side view of a flow regulating applicator of the present invention. Flow regulating applicator 10 comprises an extension component (not labeled) comprising hollow tube 20 and piston rod 30. Hollow tube 20 has inside diameter di, outside diameter d„, open entrance end 22 and open dispensing end 24. Hollow tube 20 tapers down towards dispensing end 24 so as to have inside diameter that is smaller than the average inside diameter of hollow tube 20. Piston rod 30 has an outside diameter of d„'. The extension component is bent to angle Θ. That is, hollow tube 20 and piston rod 30 bend to create angle Θ between cross sectional plane a containing the hollow tube cross section containing entrance end 22 of hollow tube 20 and cross sectional plane β containing hollow tube cross section containing dispensing end 24 of hollow tube 20. The extension component has straight section 35 extending distance L from dispensing end 24. The bend has a radius of curvature (not shown) that corresponds to the distance from the point where cross sectional planes a and β intersect to any point on the hollow tube within the bend.

Flow regulating applicator 10 further comprises a trigger mechanism (not labeled) comprising elastic force mechanism 40 and trigger 50. Elastic force mechanism 40 in regulating applicator 10 is in the form of a spring that has one end contacting an end of piston rod 30 and an opposing end resting against a housing wall of handle 60. Trigger 50 is a mechanical lever type trigger whereupon pulling trigger 50 towards handle 60 retracts piston rod 30 so as to compress the spring serving as elastic force mechanism 40. Release of trigger 50 allows the spring of elastic force mechanism 40 to move piston rod 30 within hollow tube 20 back into position to seal dispensing end 24.

Flow regulating applicator 10 also contains receiving port 70 designed so that a pressurized vessel of fluid, such as an aerosol can of spray polyurethane foam formulation, can be attached for feeding pressurized fluid into entrance end 22 of hollow tube 20.

The flow regulating applicator of the present invention is useful for dispensing and applying pressurized liquid. The method for using the flow regulating applicator is as follows: (a) provide the flow regulating applicator of the present invention as described above; (b) provide a pressurized liquid into the entrance end of the hollow tube; and (c) activating the trigger mechanism so as to retract the piston rod from the dispensing end of the hollow tube thereby opening the dispensing end of the hollow tube and allowing the pressurized liquid to travel through the hollow tube and out from the dispensing end.

Generally, the method of using the flow regulating applicator further comprises a step (d) of inactivating the trigger mechanism that occurs some time after step (c) and that results in the elastic force repositioning the piston rod so as to seal the dispensing end of the hollow tube thereby ceasing flow of the fluid out from the dispensing end of the hollow tube.

The method for using the flow regulating applicator is particularly desirable with a one-component spray polyurethane foam formulation as the pressurized liquid. One- component spray polyurethane foam formulations are moisture curable prepolymers that are under pressure due to compression with a blowing agent. Typically, the prepolymers are polymeric methylene diphenyl diisocyanate (MDI) having a free NCO ranging from 12-19 percent. The blowing agent is typically a hydrocarbon. A one-component spray

polyurethane foam formulation is generally retained in a pressure vessel free from moisture. Spray the one-component spray polyurethane foam formulation through a nozzle of some sort, such as the flow regulating applicator of the present invention to facilitate foaming of the formulation as blowing agent escapes and curing of the formulation as the prepolymer reacts with moisture in the atmosphere. Examples of one-component spray polyurethane foam formulations include GREAT STUFF PRO™ brand insulating foam sealant (GREAT STUFF and GREAT STUFF PRO are trademarks of The Dow Chemical Company).

Examples

The follow examples illustrate embodiments of the present invention and are not necessarily illustrative of the full scope of the invention.

Example 1 : Flow Regulating Applicator ( thin walled tubing)

Prepare a flow regulating applicator of the present invention by providing an applicator gun having an extension component and a trigger mechanism similar to that shown in Figure 1 (for example, Altachem's NBS HT2 39-inch long barrel gun). The extension component comprises a hollow tube that has an entrance end and a dispensing end, an outside diameter of 12 millimeters and an inside diameter of 10 millimeters. The length of the hollow tube is 90 centimeters from entrance end to dispensing end. The hollow tube comprises a tapered tip that screws on the end with the tip defining the dispensing end and opening of the hollow tube. The dispensing opening has an inside diameter of 1.3 millimeters. A piston rod having an outside diameter of 3.5 millimeters extends through the hollow tube, through the entrance end and up to the dispensing end.

The applicator gun further has a trigger mechanism comprising an elastic force mechanism that applies an elastic force to the piston rod towards the dispensing end of the hollow tube. The piston rod seals the dispensing opening at the dispensing end of the hollow tube until retracted against the elastic force. The trigger mechanism further comprises a trigger that moves the piston rod away from the dispensing end of the hollow tube against the elastic force and upon deactivating the trigger the elastic force mechanism repositions the piston rod so as to seal the dispensing end of the hollow tube.

Using a pipe bender having an inside diameter of 10.16 centimeters and a pipe groove for a 12.7 millimeter outside diameter pipe (for example, wheel model number 393 and pipe bender model number 412 by Lakeland Products) bend the barrel of the applicator gun so to have a smooth bend defining an angle of 45 degrees and a radius of curvature of 5 centimeters. Measure the bend angle as described above, that is between a cross sectional plane containing a hollow tube cross section containing the entrance to the hollow tube and a cross sectional plane containing the hollow tube cross section containing the dispensing opening of the hollow tube. After bending, the barrel of the applicator gun has a straight section between 15 and 18 centimeters in length leading up to the dispensing opening of the hollow tube.

The resulting applicator gun is an example of the flow regulating applicator of the present invention.

Example 2: Flow Regulating Applicator ( thick walled tubing)

Prepare additional examples of the flow regulating applicator of the present invention in a similar manner as in Example 1 except use a dispensing gun having a hollow tube with a 14 millimeter outside diameter and a 9 millimeter inside diameter (for example, Pro 14 XL foam dispensing gun from The Dow Chemical Company). As with the dispensing gun in Example 1, the hollow tube of this dispensing gun comprises tapered tip that screws on the end with the tip defining the dispensing opening of the hollow tube. The dispensing opening has an inside diameter of 1.3 millimeters.

For Example 2(a) bend the barrel of the applicator gun so to have a smooth bend defining an angle of 38 degrees and a radius of curvature of 7 centimeters (5 times the hollow tube outside diameter) and having a straight section of hollow tube extending up to the dispensing opening of the hollow tube that is 15 centimeters in length.

For Example 2(b) bend the barrel of the applicator gun so to have a smooth bend defining an angle of 61 degrees and a radius of curvature of 7 centimeters (5 times the hollow tube outside diameter) and having a straight section of hollow tube extending from the bend to the dispensing opening of the hollow tube that is 14 centimeters.

For Example 2(c) bend the barrel of the applicator gun so to have a smooth bend defining an angle of 90 degrees and a radius of curvature of 2.7 centimeters (1.93 times the hollow tube outside diameter) and having a straight section of hollow tube extending from the bend to the dispensing opening of the hollow tube that is 18 centimeters.

Each of Examples 2(a), 2(b) and 2(c) are examples of the flow regulating applicator of the present invention.

Example 3: Method of Using the Flow Regulating Applicator

The dispensing guns used in Examples 1 and 2 include a port onto which an aerosol can of one-component spray foam formulation (for example, GREAT STUFF PRO™ Gaps & Cracks brand insulating foam sealant) attaches to feed into the hollow tube of the dispensing gun. Attach a can of GREAT STUFF PRO™ Gaps & Cracks brand insulating foam sealant to the flow regulating applicator of Example 1. Pull the trigger of the flow regulating applicator to dispense the insulating foam sealant through the curved extension component and out of the applicator. Release the trigger to cease application of the insulating foam sealant and reseal the dispensing opening of the hollow tube with the piston rod. Application of the insulating foam sealant can be directed to a location out of site from the person operating the dispensing gun due to the curved nature of the extension component.

Follow a similar procedure to use the flow regulating applicator of any of Examples 2(a), 2(b) or 2(c) with similar results.