Dispensing – With discharge assistant – With discharge volume varying means
Patent
1976-04-20
1977-05-17
Tollberg, Stanley H.
Dispensing
With discharge assistant
With discharge volume varying means
734254P, B01L 302
Patent
active
040237168
ABSTRACT:
A liquid microdispenser consisting of a barrel with a snap-on capillary dispensing tube tip at one end containing a dispensing plunger adjustably attached to a tubular operating shaft slidably extending through a flanged bushing threaded into the other end of the barrel. A coiled spring in the barrel bears between an abutment bushing secured in the bottom end of the barrel and an abutment bushing secured on the tubular operating shaft. The plunger is in the form of a rod which is adjustably connected to the operating shaft by a set screw, and the barrel has an aperture providing access to the set screw. The abutment bushing at the bottom end of the barrel is formed at its distal end to accept the snap-on capillary tip for positioning by exerting a force thereon directed along the axis of the barrel. A bushing is secured to the top end of the operating shaft, and a headed cover screw member is threadedly engaged in the last-named bushing. The screw member has a driving stem which can be employed for loosening and tightening the set screw holding the plunger rod in adjusted position. A gauge rod is carried in the tubular operating shaft, the gauge rod being insertable in the bottom of the snap-on dispensing tube tip for setting the rest position of the dispensing plunger for precise volume delivery.
REFERENCES:
patent: 3766785 (1973-10-01), Smernoff
patent: 3786683 (1974-01-01), Berman et al.
Gordon Herman L.
Tollberg Stanley H.
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