Fluent material handling – with receiver or receiver coacting mea – Filling or refilling of dispensers – Aerosols
Reexamination Certificate
2000-09-06
2001-10-16
Maust, Timothy L. (Department: 3751)
Fluent material handling, with receiver or receiver coacting mea
Filling or refilling of dispensers
Aerosols
C141S097000, C141S275000, C141S372000
Reexamination Certificate
active
06302163
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the art of filling pressurized containers, and, more particularly, with an improved filling machine for filling aerosol cans that allows for a reductions in the emissions of volatile compounds, either from within the can's contents or its propellant.
2. Background of the Invention
Heretofore, pneumatically operated machines have been available for injecting paint and the like into precharged aerosol cans. 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 drove the paint from a cylinder at the bottom of the reservoir through the aerosol valve into the can.
Further developments involve automation of such equipment. Typical of the direction the art has taken is shown in U.S. Pat. No. 4,938,260. Such devices merely attempted to add mechanical elements and sensors to replace the manual input of the operator. For example, sensors detect the location of the can and allow a pneumatically adjustable platform to position the can to be filled, and a metering pump is monitored and controlled in order to measure the filled charge within each can.
However, although these and other improvements have been directed toward a more automated filling device, other problems within the art remain unaddressed. For example, the emission of volatile organic compounds, or VOC's, has been a source of government regulation, and continues to be a problem for such devices. Further, the reason why a single unit aerosol filling machine continues to be developed is because of a market driven need toward custom coloring and filling of paint into aerosol cans. To meet such a need, the older manual devices perform superior to a pneumatically controlled device in terms of cost, availability, reliability, maintenance, and other real-world factors that arise when a point of purchase retailer is asked to operate and maintain an automated filling device better suited toward high volume, industrial applications.
Finally, another disadvantage of the prior art resided in that open topped reservoirs tended to lose solvent by evaporation and skin over, as well as both solvent and propellant due to over-pressure blow-by. And, a mechanical aerosol can lifting mechanism adds an element of potential operator error. If the lever were misadjusted such that the operator could urge the aerosol can against the reservoir too firmly, the aerosol can could be bent or damaged. Such over pressure or analogous underpressure between the can and the reservoir could cause leakage of the paint. During an attempted filling, the paint could spray under pressure over the base and other portions of the filling apparatus. The spilled paint could readily interact with the lever and lift mechanism causing binding and sticking.
A search of the prior art did not disclose any patents that read directly on the claims of the instant invention; however, the following other references were considered related:
U.S. Pat. No.
Inventor
Issue Date
5,832,965
Fasse et al.
11/10/98
5,535,790
Hirz
07/16/96
4,938,260
Hirz
07/03/90
3,244,494
Apple et al;
04/05/66
4,727,914
Anderson, III et al.
03/01/88
5,263,519
Reyner
11/23/93
The present invention provides a new and improved aerosol can filling apparatus which overcomes the above referenced operator safety and other drawbacks of the prior art.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided an apparatus for charging pressurized aerosol cans. The apparatus includes a base in which an aerosol can support platform is movably mounted. A can support moving means selectively raises and lowers the can support platform at least between preselected raised and lowered positions. A liquid reservoir, which has an aerosol can engaging outlet, is mounted in a cabinet such that the reservoir outlet sealingly engages the aerosol can in the raised position. A driving piston under manual or piston control urges a selected amount of liquid from the reservoir through the outlet into the aerosol can which is in a raised position.
In accordance with one aspect of the present invention, the can support moving means includes an upwardly engaged, spring urged platform which maintains the can support in the raised position at the proper location to engage with the filling mechanism, a depressing lever attached thereto allows loading of the can support control means.
Other aspects of the present invention include a hydraulic valve actuation method that allows opening of the closure mechanism of a pre-charged aerosol can without a mechanical impingement.
Another advantage of the present invention is that it reduces damage to the filled aerosol cans.
Yet another advantage of the present invention is that it allows for filling of pre-charged aerosol cans by using fewer piston strokes than conventional mechanisms.
Still further advantages of the present invention will become apparent upon reading and understanding the following detailed description of the preferred embodiments.
REFERENCES:
patent: 3211191 (1965-10-01), Honisch
patent: 3604477 (1971-09-01), Grothoff
patent: 3620266 (1971-11-01), Ryder
patent: 3797534 (1974-03-01), Skidmore
patent: 5832965 (1998-11-01), Fasse et al.
Gugliotta John D.
Maust Timothy L.
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