| 摘要 |
When the actuating button (8) is pressed, the spring (22) is compressed until the time when the lower thrust surface of the thrust member (19) comes into contact with the thrust member (17). The plunger (11) has then performed its measuring stroke. If one continues to press the button (8), the second return spring (21) is compressed until part (8') comes into contact with the member (19). The plunger (11) has then performed an overstroke making it possible to purge the pipette and at the end of which it comes into contact with the tip support component (3). Thus, no dead volume of air whatever remains inside the cylinder (12) and the button (8) cannot be pressed further. The button (8) is then released and the side button (9) is pressed in the same direction. This acts on the actuating component (16) which transmits the force to the thrust member (17) which moves against the force of the return spring (18). The motion of the thrust member (17) is transmitted by the coupling member (15) through the notches (14) to the ejector member (7) to perform the ejection of the tip. When the actuating member (9) is released, the whole returns to its position of rest under the effect of the return springs (18, 23). <IMAGE>
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