Dispensing – With discharge assistant – With discharge volume varying means
Patent
1988-11-10
1990-07-24
Shaver, Kevin P.
Dispensing
With discharge assistant
With discharge volume varying means
222334, 222571, G01F 1106
Patent
active
049429841
ABSTRACT:
The present invention relates to a dispensing device comprising a housing containing at least three pressure chambers. The upper pressure chamber being separated from the middle pressure chamber by a reciprocating upper piston composed of a head and a stem. A lower piston is reciprocally positioned between the middle and lower pressure chambers such that pressurization of the lower pressure chamber exerts upward pressure on the lower piston and pressurization of the middle pressure chamber exerts downward pressure. The lower piston is fixed to a reciprocating rod which has a dispensing rod tip. The dispensing rod tip is slidably situated within a dispensing tube which has a tube opening for introduction of a dispensible material therethrough. The dispensing rod tip is reciprocatable between an upward, downward and intermediate position. In its upward position, a tube opening is non-occluded, thereby allowing the dispensible material to enter a dispensing tube. In its downward position, the tube opening is occluded and positive pressure is exerted on the dispensible material within the dispensing tube. In its intermediate position, the tube opening is occluded without exerting positive pressure on any dispensible material within the dispensing tube. The upward movement of the dispensing rod tip from the downward position to the intermediate position creates negative pressure in the dispensing tube which snuffs back any dispensible material within the dispensing tube.
REFERENCES:
patent: 3601988 (1971-08-01), Chermensky et al.
patent: 3622050 (1971-11-01), Acton
patent: 3806084 (1974-04-01), Seese
patent: 4095722 (1978-06-01), Miller
patent: 4294381 (1981-10-01), Miller
SCM Metal Products Inc.
Shaver Kevin P.
LandOfFree
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