The present invention relates to the art of filling pressurized containers. It finds particular application in conjunction with manually injecting activators into aerosol cans which have been previously charged with liquefied propellants and filled with paints, adhesives, resins or coatings and will be described with particular reference thereto. It is to be appreciated, however, that the present invention may also find application in conjunction with injecting other coating systems, including, but not limited to lubricants, fiberglass resins, SMC resins, adhesives, epoxy, urethane adhesives, and any other products which can be catalyzed or activated and dispensed from aerosol cans.
There are two common methods for filling an aerosol container with propellant, namely, the “under the cup” method which lifts the valve mounting cup and the “pressure filling” method.
More and more, the aerosol industry is resorting to “pressure filling” of the container with propellant rather than “under the cup” or out of the valve cup filling. The reasons are to diminish the loss of costly propellants and to minimize emissions of propellant into the atmosphere. In under the cup filling, a filling head actually lifts the valve cup partially out of the aerosol container and the propellant is driven under pressure through the opening between the bead (opening) of the container and the channel or circular skirt of the valve cup. In pressure filling, after product is placed in the aerosol can, the valve is crimped onto a one-inch diameter opening of the can. Then, propellant is charged into the can through the valve.
Pneumatically operated and hand operated machines have been available for some time for injecting paint and other coatings into precharged aerosol cans. For example, as illustrated in U.S. Pat. No. 3,797,534, such devices commonly included a manual lever for lifting an aerosol can to be charged into contact with a relatively small reservoir, e.g., one quart. A pneumatically operated piston drives the paint from a cylinder at the bottom of the reservoir through the aerosol valve into the can. Another example of an aerosol filling machine is the Omni-Fill® Pump owned by Sherwin-Williams.
Another example of an aerosol can filling machine is the Z-1000 Filling Machine of Seymour of Sycamore, Ill. The machine can include a manual lever and a bottle containing activator. The Z-1000 fills tints, pigments, gel coats and base coats into Seymour's pre-charged cans. The Z-100 is a manually operated pump which adds reducers, catalysts, and hardeners to an aerosol can already filled with paint or coating, propellant and solvent. The filling machine adds activator into a bottle, which then pumps the activator into the aerosol can. A problem with this system is that the pump used does not generate enough pressure to easily pump the activator through the valve of the can. The pumping system also can have leaks.
A disadvantage of using filling machines such as those described is the machines are not typically portable and the filling process must occur at the machine location rather than in the field. Another disadvantage is that the filling machines are expensive.
Still another disadvantage of a filling pump is that it is difficult to provide sufficient pressure to inject the activator into the valve of the aerosol can. The present invention provides a new and improved portable aerosol can filling gun which overcomes the above-referenced deficiencies of the prior systems while providing more advantageous overall results.
The present invention provides a filling gun which is used to add an activator to the aerosol can. The present invention relates to a filling gun assembly, similar in configuration to a caulking gun, which is used to manually inject an activator into an aerosol can without installing the can onto a pneumatic or manually operated aerosol can filling machine. The gun is inexpensive, portable, lightweight, easy to use, and can be easily transported to and used in machine shops, plants, body shops, etc. In contrast, a filling machine is typically not portable and is expensive.
A filling head gun having a housing; a handle assembly connected to the housing; a filling head attached to the housing; wherein a plunger extends through an opening of the housing and an opening of an activator reservoir attached to the plunger, the reservoir is moved into position via the plunger to feed activator through the filling head to an aerosol can.
A filling head and aerosol can assembly comprising: an aerosol can having a valve and dip tube, propellant, a coating, and a body; a filling head assembly comprising: a housing; a handle connected to said housing; a filling head attached to said housing via a piston rod; a tube containing activator which is connected to said piston rod wherein said handle is depressed to move said piston rod to feed activator through said tube into said filling head; and wherein said filling head is mounted onto said mounting cup, and a stem of said filling head seals on said valve mounting cup of said aerosol can.
A method of filling pressurized aerosol can, includes removing a spray head from the can; mounting a filling head of a filling head gun to a valve assembly of the can; sealing a valve mounting cup of the can with a stem of the filling head; pushing on the valve assembly of the can; pushing a pressurized reservoir of activator into contact with the filling head, releasing activator into the aerosol can through the stem of the fill head into the valve assembly of the can.
One aspect of the filling gun is that it is portable and can be readily used in the field. Another aspect of the filling gun is that it is inexpensive. Yet another advantage of the filling gun is that it allows the mixing of a coating and activator at the time of use, this preventing curing of the coating in the can.
Another aspect of the filling gun is that it provides sufficient thrust pressure to inject activator into the valve of the can.
Still another aspect of the filling gun is that it can be adapted to be used with female or male valves or any valve system.
Still further aspects of the present invention will become apparent upon reading and understanding the following detailed description of the preferred embodiments.
The invention may take form in various parts and arrangements of parts. The drawings are only for purposes of illustrating a preferred embodiment and are not to be construed as limiting the invention.
Referring to
Referring now to
Referring to
In the usual aerosol can or container, product and propellant are placed in a valved container. Referring to
Referring to
With reference now to
The present invention relates to a filling gun assembly E, similar in configuration to a caulking gun, which is used to inject an activator into an aerosol can B shown in
The gun is preferably used with a two-component system, wherein the can contains two components; i.e., a clear liquid or coating or paint, as well as a solvent and propellant. The coating can be a clear or color paint, base coat, clear or gel coat, or an adhesive, resin or epoxy. The gun is used as part of a two-part process, where activator is filled into or added to an aerosol can by the gun which is filled with a paint, adhesive coating, aerosol spray, epoxy, etc. in a mixing ratio such as 4:1, 1:1 or 2:1. For example, a 4-ounce product may require 1 ounce of activator; thus, the mixing ratio is 4:1. For 8 ounces of product, 4 ounces of activator may be required, or a 2:1 mixing ratio. Any ratio in the range of 1:1 to 10:1 is contemplated by the invention.
The filling gun 75 has an activator, a catalyst, a hardener, or a reducer within a tube or container or reservoir 79 which is injected into the can through a filling head 80. The tube or reservoir is pressurized with activator, much as an aerosol can is pressurized. Existing filling systems have solvents and propellants in the can, and the paint or coating is injected into the can through a filling head. The can then sprays the paint which air dries after application. In contrast, the present invention is used with a can which is already filled with paint, adhesive, resin or solvent and propellant at the aerosol manufacturer.
The gun has a tube housing 82 and a handgrip portion or trigger housing 84. The tube housing 82 is cut away along the side walls 77, 78 to provide easy access for inserting a tube 79 into the tube housing.
Filler head 80 is supported by a groove or semi-circular cutout 86 formed in U-shaped wall 88, which is at an end of side walls 77, 78 of housing 82.
Passing through the housings is a piston rod 94. Although the piston rod 94 is shown as installed in the trigger housing 84, it can be withdrawn out the rearward end of the housing 84 for complete removal. With the piston rod removed, the portions of the gun can be easily disassembled. When the gun is completely assembled, the piston rod 94 passes through central holes 96, 98 in the tube housing wall 89 and the handgrip housing, respectively.
The handle trigger 85 is ergonomically shaped to dismantle in user's hand and is shaped to fit the user's fingers. This configuration provides for a very comfortable, natural gripping tool which, by virtue of its shape, enables the user to hold the handgrip portions 97, 99 in his hand, with less likelihood that the handgrip will slip from its natural position.
The U-shaped opening 88 in the forward wall of the housing 82 is provided to permit the filling head to extend forward from the housing.
The system uses a filling head which has a stem 100 much like the stem of an aerosol can as shown in
The spray head of the aerosol can B is removed to attach the filling head 80 onto the top of the can. The stem 100 of the filling head seals on the valve mounting cup 54, and the filling head pushes down on the valve assembly thereby charging the can through the dip tube 56 to the bottom of the can.
The filling head 80 is described as being used with a female valve, but the filling head can also be used with a male valve as well, and also with any other valve system for an aerosol can without departing from the scope of the present invention.
When the activator is pressure filled into the can, the activator or catalyst causes a chemical reaction with the product. The shelf life of the product begins once the product is activated. The shelf life can range from two hours to several days or more. Therefore, the activator should not be added until the time of filling and use of the product, since the product becomes cured quickly and is ready to use. For example, the catalyst should not be added to a paint spray can until the user is ready to spray the automobile or whatever will be sprayed. At the time of application, the hardened or catalyzed paint, adhesive, or resin has a chemical reaction on the application surface and dries on the surface.
For example, a gallon of clear or colored paint would have added to it a quart of activator, resulting in a catalyzed product. A catalyzed product is preferable to use than a non-catalyzed product, since the catalyzed product has better performance characteristics. The paint alone would never dry or cure until the catalyst is added. The same applies to an adhesive, such as a structural urethane adhesive used to glue metal to metal or plastic to metal on cars or trucks. Another application would be SMC resins which would be catalyzed to be used for boat repairs.
Referring again to
Referring now more particularly to
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As soon as the valve of the can is open, activator under pressure will be fed into the chamber of the can. At the same time, the plunger or piston 94 is pushed by the handle 84 to feed activator from the reservoir 79 into the chamber of the can through the filling head. The pressure of the filling head and reservoir exceeds that of the pressurized aerosol can, thus preventing activator from traveling from the can back into the filling head.
The activator is then fed into the aerosol can, thus creating a mixture within the can such as colored paint, coating, adhesives, fiberglass resins, epoxy, etc. The can is immediately available for spraying a customized paint, adhesive, resin or coating by the user while in the field.
The handle is depressed to move the plunger or piston to push the plunger into the reservoir, thus forcing liquid activator into the filling head. The activator then travels through the stem and into the valve assembly of the aerosol can. The reservoir moves from the position shown in
Typically, the aerosol can is placed vertically on a support surface and the filling head is manually pressed downwardly onto the valve assembly which seals the stem 100 onto the valve. However, the filling head can also be used in a horizontal orientation wherein the can is horizontally secured or held and the filling head is laterally pressed into the valve.
Since the gun is transportable, the gun can be easily used in the field, such as body shops, factories, oil rigs, etc. The gun is inexpensive (around $150) in comparison to a pneumatic filling machine (around $3,500). A manual filling machine costs around $500.
Thus, the user can activate the coating in the field at the time of use. For example, the gun can be given to the user with an activator which is injected into the can and results in a specific paint, adhesive, resin or coating within the can for immediate use.
The problem with a previously activated product, such as is made with a filling machine, is that the activator can set up and cure in the can if not used within several hours. Thus, it is preferable to inject the activator just prior to use. Once activated, the coating cures due to the chemical reaction between the activator and paint. After use, the can should be discarded.
Advantages of the filling gun are its low cost, portability, ease in using in the field, such as in body shops, oil rigs, factories, plants, etc.; and ability to be used with an aerosol can having a female or male valve, or any valve system. The filling gun can be used with any product that needs to be catalyzed or activated, such as paints, adhesives, resins, fiberglass or SMC resins, epoxy, etc.
The exemplary embodiment has been described with reference to the preferred embodiments. Obviously, modifications and alterations will occur to others upon reading and understanding the preceding detailed description. It is intended that the exemplary embodiment be construed as including all such modifications and alterations insofar as they come within the scope thereof.
This application claims priority from Provisional Application Ser. No. 60/875,909 filed on Dec. 20, 2006.
Number | Name | Date | Kind |
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3335765 | Moonan | Aug 1967 | A |
3338022 | Moonan et al. | Aug 1967 | A |
3620266 | Ryder | Nov 1971 | A |
3797534 | Skidmore | Mar 1974 | A |
4427039 | Brooks et al. | Jan 1984 | A |
5535790 | Hirz | Jul 1996 | A |
5740841 | Hirz | Apr 1998 | A |
5743431 | Brattesani | Apr 1998 | A |
6050310 | Trigiani | Apr 2000 | A |
6302163 | Zeigler | Oct 2001 | B1 |
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7252119 | Heatley | Aug 2007 | B2 |
Entry |
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Omni-Fill Operators Manual, The Sherwin-Williams Company, (C)2000 (Rev. 07), all pages. |
Number | Date | Country | |
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20080149216 A1 | Jun 2008 | US |
Number | Date | Country | |
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60875909 | Dec 2006 | US |