Dispensing – With discharge assistant – Container with follower
Patent
1995-09-29
1997-07-15
Kaufman, Joseph
Dispensing
With discharge assistant
Container with follower
222391, G01F 1100
Patent
active
056475152
ABSTRACT:
An dispensing system is provided with a stepping plunger to minimize the air buffer at develops as material is dispensed. The stepping plunger includes a plunger body having an air passage therethrough for insertion into a syringe containing a material to be dispensed, A plunger rod having an air passage therethrough is attached at one end to the plunger body, and at the other end to an air hose. The plunger rod has a plurality of equally-spaced detents distributed along at least a portion of its the length, and a detent pin is urged into contact with at least one of said detents under spring bias. The detents are ramped to permit the plunger rod and said plunger body to move axially in one direction while being prevented from moving the opposite direction. The plunger body follows the level of material in said syringe as it is dispensed while maintaining a substantially zero air buffer in said syringe.
REFERENCES:
patent: 1042627 (1912-10-01), Watson
patent: 1661521 (1928-03-01), Zimmerman
patent: 2845805 (1958-08-01), Crewe
patent: 3076225 (1963-02-01), Sherbondy
patent: 3105614 (1963-10-01), Sherbondy
patent: 4268481 (1981-05-01), Suovaniemi et al.
patent: 4452285 (1984-06-01), Leibhard et al.
Driessen Bernardus Jozef
Zwijnenberg Lambertus Herman
Kaufman Joseph
Noe George T.
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