Measuring and testing – Measuring vessel
Patent
1977-03-30
1978-07-04
Swisher, S. Clement
Measuring and testing
Measuring vessel
B01L 302
Patent
active
040981258
ABSTRACT:
An adjustable volume pipetting device comprising a barrel assembly and a plunger assembly, including a plunger wire, and so constructed that the length of the plunger wire stroke is adjustable while retaining a fixed relationship between the end of the plunger wire and the end of a capillary tube. The novel construction comprises a barrel assembly including an elongated barrel, a sleeve threadably engaged with said barrel and axially adjustable thereon by relative rotation between said barrel and sleeve, a tubular stop coaxially mounted within said sleeve adjacent one end thereof, a capillary tube coaxially mounted in the one end of said sleeve and projecting outwardly from said sleeve and barrel, a slip ring slidably mounted on said barrel adjacent the other end of said sleeve, and a lock nut threadably engaged with said barrel and axially adjustable thereon by relative rotation between said barrel and nut.
REFERENCES:
patent: 1809813 (1931-06-01), Kantor
patent: 2530909 (1950-11-01), Riggs
patent: 3334788 (1967-08-01), Hamilton
patent: 3815790 (1974-06-01), Allen et al.
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