Patent ID: 7731908
Filing Date: 2010-06-08
Classification: B01L

Abstract:
1. A pipette, comprising a pipette casing ( 2 ) which has disposed therein, a seat ( 4 ) for the mounting portion ( 5 ) of a syringe cylinder ( 8 ) of a syringe ( 6 ), a piston seat ( 11 ) in an accommodating body ( 10 ) for a syringe piston ( 12 ) of the syringe ( 6 ), mounting devices ( 19 , 28 ) for reversibly fixing the mounting portion ( 5 ) and syringe piston ( 12 ) within the seats ( 14 , 11 ), and piston adjusting devices ( 15 ) for displacing the accommodating body ( 10 ) within the pipette casing ( 2 ), wherein the mounting portion ( 5 ) and syringe piston ( 12 ) are adapted to be axially slid to their mounting positions through axial apertures ( 7 , 13 ) of their seats ( 4 , 11 ), the mounting devices ( 19 , 28 ) have radially advanceable gripping devices for fixing the mounting portion ( 5 ) and syringe piston ( 12 ) in the mounting positions, the gripping devices have syringe gripping levers ( 19 ) pivotally supported within the pipette casing and piston gripping levers ( 28 ) pivotally supported within the accommodating body ( 10 ), the syringe gripping levers ( 19 ) and piston gripping levers ( 28 ) are configured to have two arms including a gripper arm ( 21 , 30 ) and an actuator arm ( 23 , 31 ), the syringe gripping levers ( 19 ), at the insides of their actuator arms, have contact points ( 25 ) which when their actuator arms ( 23 ) are actuated are adapted to be externally pivoted against the actuator arms ( 31 ) of the piston gripping levers ( 28 ) and actuate the piston gripping levers ( 28 ), the syringe gripping levers ( 19 ) have inwardly projecting release levers ( 33 ) on the actuator arms ( 23 ), a transfer element ( 35 ) which is slidably guided transversely with respect to the release levers ( 33 ) within the pipette casing ( 2 ) in at least one guide ( 37 ) is adapted to be brought into abutment against the two release levers ( 33 ) by being shifted by a front-end sided abutment area ( 40 ) within the guide ( 37 ), and a trigger ( 46 ) displaceably disposed within the pipette casing ( 2 ) which is coupled to the transfer element ( 35 ) to displace the transfer element ( 35 ) within the guide ( 37 ) upon displacement of the trigger ( 46 ).