Dispensing – With filter
Reexamination Certificate
2000-05-24
2001-11-13
Shaver, Kevin (Department: 3754)
Dispensing
With filter
C222S189110, C222S559000, C222S146500, C239SDIG002
Reexamination Certificate
active
06315168
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to fluid dispensing head assemblies, and more particularly to a new and improved removable inline nozzle filter which is incorporated within the valve assembly component of the overall fluid dispensing head assembly so as to be disposed immediately upstream of the valve nozzle in order to trap any minute particles or debris which could otherwise clog or block the dispensing nozzle.
BACKGROUND OF THE INVENTION
Fluid dispensing head assemblies, whether they are used for dispensing or depositing hot melt adhesives, plastic extrusion materials, cosmetic lotions, or the like, are of course well known. Such fluid dispensing head assemblies, such as, for example, hot melt adhesive dispensing head assemblies, normally comprise filter mechanisms or components which are disposed within a filter block to which a hot melt adhesive supply conduit is fixedly connected. More particularly, the filter mechanism or component is conventionally disposed within the filter block immediately downstream of the fluidic connection defined between the hot melt adhesive supply conduit and the filter block.
While such filter component or mechanism therefore filters or entraps most particles or debris whereby such debris or particles do not contaminate the hot melt adhesive, debris or particles as small as, or smaller than, 0.005 inches sometimes find their way or migrate through the system, ultimately clogging or blocking nozzles which may have small orifices on the order of 0.010-0.015 inches in diameter. Such particles can be released, for example, during primary filter change operations whereby stagnant debris disposed around the filter component may be dislodged or otherwise stirred up or released, or alternatively, such particles can be formed within the adhesive head assembly after the primary filtration has taken place within the aforenoted filter block upstream and remote from the dispensing valve assembly nozzle. Regardless of how such particles or debris are formed or find their way into the adhesive dispensing system, it is desirable to catch or entrap such particles before they enter the dispensing valve assembly nozzle.
A need therefore exists in the art for a removable inline nozzle filter which can effectively be incorporated within the dispensing valve assembly at a position or location immediately upstream of the dispensing nozzle so as to catch, filter, or entrap any particles or debris which may nevertheless still be present within the system despite previous filtration of the hot melt adhesive within the conventional filter block assembly at a position or location upstream and remote from the dispensing nozzle.
OBJECTS OF THE INVENTION
Accordingly, it is an object of the present invention to provide a new and improved removable inline nozzle filter for incorporation within a hot melt adhesive dispensing head assembly.
Another object of the present invention is to provide a new and improved removable inline nozzle filter for incorporation within a hot melt adhesive dispensing head assembly which is able to overcome the operational drawbacks or deficiencies of conventional hot melt adhesive dispensing head assemblies.
An additional object of the present invention is to provide a new and improved removable inline nozzle filter for incorporation within a hot melt adhesive dispensing head assembly which is able to overcome the operational drawbacks or deficiencies of conventional hot melt adhesive dispensing head assemblies by filtering or trapping small particles or debris which may block or clog the hot melt adhesive dispensing valve assembly nozzle.
A further object of the present invention is to provide a new and improved removable inline nozzle filter for incorporation within a hot melt adhesive dispensing head assembly which is able to overcome the operational drawbacks or deficiencies of conventional hot melt adhesive dispensing head assemblies by filtering or trapping small particles or debris which may block or clog the hot melt adhesive dispensing valve assembly nozzle as a result of the disposition of the removable inline nozzle filter within the hot melt adhesive dispensing valve assembly at a position or location which is immediately upstream of the hot melt adhesive dispensing valve assembly nozzle.
SUMMARY OF THE INVENTION
The foregoing and other objectives are achieved in accordance with the teachings and principles of the present invention through the provision of a new and improved removable inline nozzle filter which comprises a filter member or component which is mounted within the hot melt adhesive dispensing valve assembly at a position or location which is immediately upstream of the hot melt adhesive dispensing valve assembly nozzle. More particularly, the filter member or component is interposed between the valve seat for the hot melt adhesive dispensing valve which is formed within the hot melt adhesive dispensing valve assembly adapter and the hot melt adhesive dispensing valve assembly nozzle which is threadedly mounted within the adapter. In order to change or replace the inline nozzle filter member or component, the nozzle is simply removed from the valve assembly adapter by unthreading the nozzle from the valve assembly adapter, re- moving the old inline nozzle filter member, inserting a new inline nozzle filter member, and remounting the nozzle upon the valve assembly adapter by again threadedly engaging the nozzle with the valve assembly adapter. The inline nozzle filter will significantly increase the operational time of the hot melt adhesive dispensing valve assembly before servicing of the adhesive nozzle is again required.
REFERENCES:
patent: 688086 (1901-12-01), Grossman
patent: 5065979 (1991-11-01), Detweiler et al.
patent: 5975357 (1999-11-01), Topar
patent: 6015103 (2000-01-01), Kotkowicz
Bolyard, Jr. Edward W.
Bourget Daniel D.
Illinois Tool Works Inc.
Schwartz & Weinrieb
Shaver Kevin
Willatt Stephen
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