Dispensing – With recorder – register – indicator – signal or exhibitor – Position or extent of motion indicator
Patent
1975-02-25
1976-09-21
Knowles, Allen N.
Dispensing
With recorder, register, indicator, signal or exhibitor
Position or extent of motion indicator
222309, 222382, 222383, B67D 522
Patent
active
RE0289701
ABSTRACT:
A burette consisting of a calibrated syringe chamber with a top flange and a reciprocable dispensing plunger. The plunger has a top actuator with a depending vertical rod on which is adjustably mounted a stop collar serving as a dispensing volume indicator and being engageable with said top flange to limit the upward extension of the plunger. The syringe chamber has a bottom outlet conduit including a check valve which opens when the plunger is drawn upwardly. The syringe chamber also has a discharge conduit at the level of the lowermost position of the bottom end of the plunger, the discharge conduit having a check valve which opens when the plunger is pushed downwardly for a discharge stroke. The chamber has a vent tube connected thereto at its lower portion. Below this the chamber has a peripheral rib, and O-rings are mounted on the chamber above and below the rib. An internally threaded annular cap surrounds the O-rings and acts to clamp the O-rings against the intervening rib when the cap is tightened on the neck of a container, so as to provide an air-tight seal relative to the container when the cap is tightened.
REFERENCES:
patent: 2792157 (1957-05-01), Gilman
patent: 3067915 (1962-12-01), Shapiro et al.
patent: 3122280 (1964-02-01), Goda
Gordon Herman L.
Knowles Allen N.
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