초록 ▼

A pipette, comprising: a cylinder (1) with liquid passage (3), a plunger (4), and a plunger operating assembly (5) for moving the plunger in the cylinder; the operating assembly comprising a body (6), a threaded rod (7), an operating member (8) cooperating by mediation of threads with the threaded r

A pipette, comprising: a cylinder (1) with liquid passage (3), a plunger (4), and a plunger operating assembly (5) for moving the plunger in the cylinder; the operating assembly comprising a body (6), a threaded rod (7), an operating member (8) cooperating by mediation of threads with the threaded rod, and a power unit (9) for rotating the threaded rod and the operating member relative to each other for moving the plunger by mediation of the threaded rod and the operating member when the threaded rod and the operating member are rotated relative to each other with the aid of the power unit; the thread of the threaded rod (7) or alternatively that of the operating member (8) being non-linear locally over a certain transition range.

대표청구항 ▼

A pipette, comprising: a cylinder constituting a cylinder volume with a liquid passage; a plunger placed to be reciprocatingly movable in said cylinder volume; and a plunger operating means for moving the plunger in the cylinder; said operating means comprising a body, a threaded rod, an operating m

A pipette, comprising: a cylinder constituting a cylinder volume with a liquid passage; a plunger placed to be reciprocatingly movable in said cylinder volume; and a plunger operating means for moving the plunger in the cylinder; said operating means comprising a body, a threaded rod, an operating member cooperating by mediation of threads with said threaded rod, and a power means for rotating the threaded rod and the operating member relative to each other; said body being connectable to the cylinder and the threaded rod/operating member combination, to the plunger, for moving the plunger by mediation of the threaded rod and the operating member when the threaded rod and the operating member are rotated relative to each other with the aid of the power means, characterized in that the thread of the threaded rod or alternatively that of the operating member, is non-linear locally over a certain transition range; and characterized in that the thread is non-linear in such a manner that uniform rotary motion of the threaded rod and the operating member relative to each other, mediated by the thread, causes a maximum of the axial movement of the threaded rod and the operating member in that range or the thread which corresponds to starting the plunger movement from zero volume of the cylinder volume in the filling direction.