Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1997-04-15
1999-03-09
Pyon, Harold Y.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
422103, 436180, 7386413, 7386414, 7386418, B01L 302, G01N 114
Patent
active
058796339
ABSTRACT:
The object of the invention is a ratchet wheel pipette having a body and in it a cylinder (3) and a piston (12) and a filling and dispensing arrangement to draw liquid into the cylinder and to dispense it in smaller portions with the aid of the piston. The pipette has a push rod (11) as an extension of the piston, a transmission wheel (6) in mesh with the push rod, a ratchet wheel (5) having a larger diameter than the transmission wheel and rotating with it and having a peripheral engaging surface, such as gears, and, journaled on the same shaft as the ratchet wheel, a dispensing lever (9) which is movable between an upper position and a lower position and with an attached pawl (10) engaging the engaging surface of the ratchet wheel, so that when the dispensing lever moves downwards, beginning at a certain point of the movement, the pawl engages the engaging surface of the ratchet wheel and forces the ratchet wheel and thus also the transmission wheel to rotate, and so that when the dispensing lever moves upwards the pawl does not rotate the ratchet wheel. The pipette can be used in laboratories, for instance to dispense samples or reagents.
REFERENCES:
patent: 2175601 (1939-10-01), Grund
patent: 2942603 (1960-06-01), Geyer
patent: 3615240 (1971-10-01), Sanz
patent: 3977574 (1976-08-01), Thomas
patent: 4406170 (1983-09-01), Kuhn
patent: 4929428 (1990-05-01), Tezuka
patent: 5330721 (1994-07-01), Tervamaki
patent: 5364596 (1994-11-01), Magnussen, Jr. et al.
Instruction Manual for Stepper 411 pipette manufactured by Socorex ISBA S.A. Believed to be published prior to 1995.
Jarvimaki Kari
Mikkonen Jouko
Pullinen Tapani
Tervamaki Jukka
Labsystems Oy
Pyon Harold Y.
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