Pipette device

A pipette device, comprising a housing, an actuating element protecting from the upper end of said housing, a cylinder provided in said housing, a piston movable in said cylinder for displacing an air volume in said cylinder, a rod connecting said piston to said actuating element, said actuating element being adapted to be manually depressed against a spring bias to move said piston in said cylinder, and an adapter cone attached to said housing and adapted to receive a replaceable pipette tip communicating with said cylinder, said piston comprising an outer tube-like shell fixedly connected to an inner support to move as a unit for operation, said inner support being formed of a heat insulating material and a coupling for removably mounting said rod to said support the coupling comprising a supporting surface for the upper end of said shell.

A pipette device, comprising a housing, an actuating element projecting from the upper end of said housing, a cylinder provided in said housing, a piston movable in said cylinder for displacing an air volume in said cylinder, a rod connecting said piston to said actuating element, said actuating element being adapted to be manually depressed against a spring bias to move said piston in said cylinder, and an adapter cone attached to said housing and adapted to receive a replaceable pipette tip communicating with said cylinder, said piston comprising an outer tube-like shell fixedly connected to an inner support to move as a unit for operation, said inner support being formed of a heat insulating material and including a guide sleeve slidingly receiving said piston, which guide sleeve is resiliently urged into engagement with an annular seal supported on an inner conical wall portion of the housing.

A pipette device, comprising a housing, an actuating element projecting from an upper end of said housing, a cylinder provided in said housing, a piston movable in said cylinder for displacing an air volume in said cylinder, a rod connecting said piston to said actuating element which is adapted to be manually depressed against a spring bias to move said piston in said cylinder, and an adapter cone attached to said housing and adapted to receive a replaceable pipette tip communicating with said cylinder, said piston comprising an outer tube-like shell and an inner support carrying said outer shell and connected to said actuating element by said rod, said outer shell being comprised of ceramic material and said inner support being formed of a heat insulating material comprised of plastic.