Dispensing – Automatic control – Motor control
Reexamination Certificate
1999-10-01
2001-10-23
Shaver, Kevin (Department: 3754)
Dispensing
Automatic control
Motor control
C222S444000, C222S334000
Reexamination Certificate
active
06305574
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to dispensing devices and especially those employed for filling or dosing packages with fluids, for example sealant compositions.
BACKGROUND OF THE INVENTION
In one method of pigmenting or packaging sealants, an apparatus is used comprising at least one three-way valve to dose the pigment or the sealant or fungicide. Typically one may use in such apparatus a rotary valve set-up so as to allow the material to flow from a drum or buffer tank into a dosing cylinder. After rotation of the internal part of the valve, the material is pushed from the dosing cylinder to the package. Due to the continual rotation of the internal part of the valve and the high pressure used, rapid wear may occur, leading to leaks and frequent maintenance.
This invention provides a dispensing device which does not involve any rotating part.
SUMMARY OF THE INVENTION
The present invention is a dispensing device comprising a reservoir, a one way valve through which material may be conducted into the reservoir but through which the material may not be conducted out of the reservoir, a one way valve set to permit flow of material from the reservoir via an exit port while the pressure on the material in the reservoir is not less than a predetermined value, the reservoir comprising a piston and cylinder device capable of permitting expansion of the capacity of the reservoir as material is conducted into the reservoir, an electrical switch means adapted to detect and terminate the expansion of the reservoir at a predetermined capacity value, and a means for exerting pressure on material within the reservoir when the expansion of the reservoir has been terminated.
As will be apparent a dispensing device according to the present invention employs a system of differential pressure to open or close valves. In use, a dispensing device according to the invention can be expected to be more reliable than previously used devices and require much less maintenance.
REFERENCES:
patent: 3207384 (1965-09-01), Wall
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patent: 4022269 (1977-05-01), Segawa
patent: 4159784 (1979-07-01), D'autry
patent: 4255088 (1981-03-01), Newton et al.
patent: 4425986 (1984-01-01), Wedlin
patent: 4545504 (1985-10-01), Fabel et al.
patent: 4547134 (1985-10-01), Hirvonen
patent: 4826050 (1989-05-01), Murphy et al.
patent: 4830230 (1989-05-01), Powers
patent: 2 231 624 (1990-11-01), None
patent: 91/08445 (1991-06-01), None
patent: 98/23932 (1998-06-01), None
Dow Corning S.A.
Nicolas Frederick C
Shaver Kevin
Warren Jennifer S.
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