Quantitative pipette

Details Quantitative pipette Quantitative pipette

1989-02-21

1990-05-29

Richman, Barry S.

Chemical apparatus and process disinfecting, deodorizing, preser

Control element responsive to a sensed operating condition

7386413, 7386414, B01L 302, B67D 508

Patent

active

049294288

ABSTRACT:
A quantitative pipette comprising a cylinder, a plunger inserted into the cylinder capable of sucking and discharging a prescribed amount of liquid by the movement of the plunger at a prescribed distance, a ratchet having plural teeth at regular intervals, a driving means for rotating the ratchet, a damping means for damping the rotation of the ratchet not faster than a prescribed speed, a ratchet-engaging means capable of engaging the ratchet to stop it so as to permit the rotation of the ratchet intermittently, a pinion rotating simultaneously with the ratchet, a rack engaging the pinion and fixing said plunger, and a rotary means for rotating from the outside said ratchet or pinion opposed to the driving force of said driving means.

REFERENCES:
patent: 4760939 (1988-08-01), Ball et al.

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