Plunger homing mechanism for use in chromatography

Details Plunger homing mechanism for use in chromatography Plunger homing mechanism for use in chromatography

1990-04-05

1994-11-01

McMahon, Timothy M.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Sample mechanical transport means in or for automated...

422 67, 422 81, 422100, 422104, G01N 114

Patent

active

053605969

ABSTRACT:
A plunger homing mechanism for use in automated chromatography. A plunger cap holder holds the plunger cap of a syringe within a housing. The housing is biased with an isolation spring within a casing. The casing is raised and lowered to move the syringe plunger held within the housing. When the casing is lowered and the plunger hits bottom, the relative movement between the housing and the casing is detected by a sensor. The casing movement is then caused to stop. This permits the detection of a home or reference position for the accurate and precise withdrawal of a sample to be analyzed. Additionally, damage to the syringe from over driving the plunger rod is prevented.

REFERENCES:
patent: 3915651 (1975-10-01), Nishi
patent: 4199013 (1980-04-01), Reich et al.
patent: 4325909 (1982-04-01), Coulter et al.
patent: 4586546 (1986-05-01), Mezei et al.
patent: 4713974 (1987-12-01), Stone

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