Adjustable pipette

Details Adjustable pipette Adjustable pipette

1995-07-24

1997-07-22

Warden, Jill

Chemical apparatus and process disinfecting, deodorizing, preser

Control element responsive to a sensed operating condition

7386413, 7386414, 7386418, B01L 302

Patent

active

056501242

ABSTRACT:
An adjustable pipette has a piston axially moveable in a body for alternately drawing and dispensing a liquid sample. An upper stop is moved axially to vary the sample size by rotation of a threaded shaft. A drive member is keyed to the threaded shaft for simultaneous rotation but the drive member and shaft can freely move axially relative to one another. The drive member is moved axially to an unlocked position in order to adjust the sample volume and is axially moved to a locked position in which rotation and inadvertent misadjustment of the sample volume is prevented. A collar on the drive member fits tightly into a throat of the pipette body to lock the drive member against rotation.

REFERENCES:
patent: Re32210 (1986-07-01), d'Autry
patent: 3827305 (1974-08-01), Gilson et al.
patent: 4141250 (1979-02-01), D'Autry
patent: 4284604 (1981-08-01), Tervamaki
patent: 4298575 (1981-11-01), Berglund
patent: 4909991 (1990-03-01), Oshikubo
patent: 5012682 (1991-05-01), Sabloewski
patent: 5018394 (1991-05-01), Gilson
patent: 5104624 (1992-04-01), Labriola
patent: 5320810 (1994-06-01), Al-Mahareeq et al.

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