Measuring and testing – Measuring vessel
Patent
1978-10-18
1981-03-24
Tollberg, Stanley H.
Measuring and testing
Measuring vessel
222309, 222391, G01N 114
Patent
active
042572673
ABSTRACT:
A dispenser unit preferably adjustable for either single dose or multiple dose dispensing of fluids; primarily for the precision dispensing of small volumes (e.g. volumes measured in microliters). The unit includes an elongate actuator rod axially moveable in one direction to dispense the fluid, and a hand-engageable dispensing lever including a passageway through which the actuator rod extends. A measured, or predetermined quantity of the fluid is dispensed by manually applying a force to the lever in the one axial direction to maintain a canted relationship between the lever and actuator rod. This canted relationship causes surfaces of the passageway to lock against the actuator rod, and the axially directed manual force on the lever will move the rod to dispense the fluid. Most preferably a separate securing mechanism also is provided to cause the lever and actuator rod to lock together so that they will move as a single unit in either axial direction when it is desired to convert the unit from a multiple dose dispenser to a single dose dispenser. Most preferably the dispensing lever extends through an elongate slot in a side wall of a body section of the unit, and this slot is interrupted by upper and lower surfaces that define the length of the dispensing stroke of the lever. Most preferably the upper and lower surfaces interrupting the slot are axially adjustable to vary the length of the dispensing stroke.
REFERENCES:
patent: 2305238 (1942-12-01), Coates
patent: 2685389 (1954-08-01), Robbens
patent: 2916057 (1959-12-01), Carle et al.
patent: 3810391 (1974-05-01), Suovaniemi
Bohr Scientific Corporation
Faigus Martin L.
Tollberg Stanley H.
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