Repeating pipet having a plunger advance mechanism

Details Repeating pipet having a plunger advance mechanism Repeating pipet having a plunger advance mechanism

1995-10-02

1997-09-30

Pyon, Harold

Chemical apparatus and process disinfecting, deodorizing, preser

Control element responsive to a sensed operating condition

7386416, 7386418, 222287, B01L 302

Patent

active

056723202

ABSTRACT:
An advancing mechanism is provided for movement of a pipet plunger in a repeating pipet. The advancing mechanism includes a rack communicating with the pipet plunger, a pawl pretensioned against the rack and displaceable by an activating element and an engagement control element located between the rack and the pawl. The advancing mechanism also includes an adjusting element for adjusting the engagement control element to one of a plurality of engagement positions. The engagement control element is preferably a rotatable sleeve having lower axial steps and upper limiting stops. The pawl is connected to a sliding body connected with the actuating element and axially displaceable within the sleeve.

REFERENCES:
patent: 4099548 (1978-07-01), Sturm et al.
patent: 4399711 (1983-08-01), Klein
patent: 4406170 (1983-09-01), Kuhn
patent: 5323931 (1994-06-01), Robards, Jr. et al.

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