Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1979-05-31
1981-08-18
Smith, William F.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
7386418, 128218P, 128218C, B03C 100, B01L 302
Patent
active
042846048
ABSTRACT:
The subject of the invention is a pipette with an adjustable volume, wherein an upper stop bushing provided with inside threading is arranged around the piston shaft of the pipette in corresponding threading formed around said piston shaft. When the press button is turned, the upper stop bushing that determines the top position of the piston can be moved by means of the thread joint up and down in relation to the piston shaft so as to adjust the volume of the pipette. In the frame casing of the pipette, along the side, a longitudinal slit passing through the frame casing and provided with a scale is arranged. At the bottom end of the piston shaft, an expansion part is arranged or formed into which a ball is fitted in a bore,, said ball being pressed outwards by a spring. When the press button is turned, the ball is always during the movement of rotation, when it comes over the slit in the pipette frame, pressed against the sides of the slit in the wall of the upper stop bushing thereby locking the press button and the piston shaft in position. Then, by means of its position in the slit, the ball expresses the pipettable volume, which can be read from the scale.
REFERENCES:
patent: 2771277 (1956-11-01), Brown et al.
patent: 2792834 (1957-05-01), Kapelsohn
patent: 3327904 (1967-06-01), Goda et al.
patent: 3780734 (1973-12-01), Wulff
patent: 3834590 (1974-09-01), Robinson et al.
patent: 4096750 (1978-06-01), Sturm
patent: 4141251 (1979-02-01), Oshikubo
Kommandiittiyhio Finnpipette Osmo A Suovaniemi
Konkol Chris
Smith William F.
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