Volume calibration syringe

Details Volume calibration syringe Volume calibration syringe

1982-07-06

1985-08-27

Levy, Stewart J.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73 3, 7386487, 604186, G01D 1800, G01F 2500, G01N 3700

Patent

active

045370583

ABSTRACT:
A calibration syringe for controllably delivering gas to a respiratory gas measuring instrument during the calibration thereof. In addition to the piston and cylinder arrangement used in prior syringes, the calibration syringe of the invention includes several improvements which enhance the accuracy and repeatability of the volume of gas delivered thereby. One improvement comprises a modified inlet-outlet design which assures a positive shutoff of the flow of gas at the end of an ejection stroke. A second improvement comprises the provision of a spring-loaded mechanism for automatically propelling the piston at any of several operator selectable rates. Finally, the calibration syringe of the invention includes a latching arrangement which assures that each ejection stroke begins from the same starting position and is initiated in a way that minimizes operator-related effects.

REFERENCES:
patent: 544014 (1895-08-01), Terramorse
patent: 640868 (1900-01-01), Bring
patent: 1434198 (1922-10-01), Calhoun
patent: 1643744 (1927-09-01), Lowenfeld
patent: 2221739 (1940-11-01), Reiter
patent: 3146620 (1964-09-01), Morril, Jr.
patent: 3270548 (1966-09-01), Marbach
patent: 3425262 (1969-02-01), Herzog
patent: 3824859 (1974-07-01), Harris, Sr. et al.
patent: 3882729 (1979-05-01), Roach
patent: 4196618 (1980-04-01), Patterson
patent: 4448058 (1984-05-01), Jaffe et al.

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