The Sailor Pen Co., Ltd.

Itochu Corporation

Kiyoto Shigematsu

Isao Inagaki

Akira Tsuji

Yoshiyuki Sunaga

Isao Shimada

Fumio Kobayashi

Ichiro Morimoto

Eiji Hishinuma

Kazumitsu Ohga

A nozzle is formed on a distal end side of a cylinder The nozzle has an intermediate portion formed such that a tip is freely attachable thereto and detachable therefrom. The intermediate portion of the nozzle is formed with an annular projection for retaining the tip The tip has a thick portion provided in a root portion thereof and formed larger in diameter than a root portion of the nozzle to be abuttable against a tip releasing member Along an inner periphery of the root portion of the tip an annular projection is formed to contact with the annular projection of the nozzle thereby providing a seal with the nozzle Both the annular projections and of the nozzle and the tip are arranged to reach a position where a sound of abutment is produced between the root end surface of the tip and the shoulder of the nozzle at the completion of fitting of the tip onto the nozzle

Tip for pipette and pipette with the same

A cylinder 3 in a casing 2 is provided with a first suction chamber 34 and a nozzle part 33 having a suction passage 3d in communication with the first suction chamber 34. In the casing 2. a first piston 4 which is slidably inserted into the first suction chamber 34 and includes a second suction chamber 43 is provided with pushed in a direction of protruding from the first suction chamber 34. Further, in the casing 2, a second piston 5 slidably inserted into the second suction chamber 43 is provided with pushed with less resiliency than with respect to the first piston 4 in a direction of protruding from the second suction chamber 43. At the top part of the casing 2, an operating lever 6 is provided for operating the first and second pistons 4 and 5 to switch between a small suction position that the second piston 5 is embedded in the first piston 4 and a large suction position that the first and second pistons 4 and 5 are embedded in the cylinder 3 and the first piston 4, respectively.

Pipette

Growing community of inventors

Tokyo, Japan

Kiyoto Shigematsu