Patent ID: 7674432

Claim:
A pipetting device comprising an upper part of a casing ( 1 ); a drive equipment ( 2 ) arranged in the upper part of the casing ( 1 ) with a movable drive element ( 3 ); a spigot receiver ( 10 ) arranged in the upper part of the casing ( 1 ); at least one claw receiver ( 13 ) inside the spigot receiver ( 10 ); a lower part of the casing ( 14 ); at least one displacement equipment ( 15 ) arranged in the lower part of the casing ( 14 ) with a displacement chamber ( 16 ); at least one seat ( 21 ) for detachably holding a pipette point arranged on the lower part of the casing ( 14 45 ) and being connected with the displacement chamber ( 16 ) via a channel ( 22 ); a spigot ( 25 ) arranged on the lower part of the casing ( 14 , 45 ), to be inserted into the spigot receiver ( 10 ); at least one snap hook ( 26 ′, 26 ″) arranged on the spigot ( 25 ) with a claw ( 28 ′, 28 ″) for engaging into the claw receiver ( 13 ) when the spigot ( 25 ) is inserted into the spigot receiver ( 10 ); and a springy shaft ( 27 ′, 27 ″) which is deflectable transversely to the axis of the spigot ( 25 ) in order to lift off the claw ( 28 , 28 ″) out of the claw receiver ( 13 ); a lock release ring ( 37 ) movable on the spigot; a wedge gear ( 29 ′, 29 ″, 46 ′, 46 ″, 37 ) on the springy shaft ( 27 ′, 27 ″) and a lock release ring ( 37 ) effecting deflection of the snap hook ( 26 ′, 26 ″) towards the axis upon displacement of the lock release ring ( 37 ) in one direction and away from the axis upon displacement of the lock release ring ( 37 ) in the direction opposite thereto; and a coupling equipment ( 19 ) for coupling the drive element ( 3 ) and the displacement equipment ( 15 ) when the spigot ( 25 ) is inserted into the spigot receiver ( 10 ).