Adjustable volume pipette with improved volume adjustment lock m

Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition

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Details

7386413, 7386416, 7386418, 422103, G01N 114, B01L 302

Patent

active

058492488

ABSTRACT:
A volume adjustable pipette for aspirating and dispensing precise volumes of liquid comprising an elongated hollow hand-holdable housing supporting a plunger for turning and for axial movement within the housing the pipette including (i) an upper stop which is axially adjustable within the housing in response to a turning of the plunger to adjust the volume of liquid which may be drawn into a tip secured to a lower end of the housing upon upward axial movement of the plunger to the upper stop and (ii) a manually actuated lock mechanism for locking the plunger against rotation to set the volume adjustment for the pipette and comprising a hand-turnable knob for actuating and releasing the lock mechanism by virtue of two thumb and/or finger engageable wings extending outwardly from diametrically opposite sides of the hand-turnable knob a gripping member for fixedly securing the plunger against turning and being actuated by a turning of the hand-turnable knob to force a cam surface of the knob against a cam surface of the gripping member.

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: 4406170 (1983-09-01), Kuhn
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.
patent: 5330721 (1994-07-01), Tervamaki

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