Measuring and testing – With fluid pressure – Leakage
Patent
1993-10-07
1994-06-14
Williams, Hezron E.
Measuring and testing
With fluid pressure
Leakage
73 37, G01M 332
Patent
active
053199570
ABSTRACT:
The apparatus for checking the volume of bottles (1) comprises a head (2) adapted to be moved sealingly onto the bottle mouth (21), with a metering piston (7) which is displaceable in relation to the head (2) to be inserted into the bottle (1) and compress the air contained therein, and a pressure sensor (9) for measuring the excess pressure produced in the bottle. The measured volume (11) in the bottle is linked to a compensating volume (12) through a duct (10). The compensating volume is determined on the one hand by the constant starting height of the metering piston (7) and on the other hand by the variable displacement path length of the head (2). This ensures that the compression ratios are always the same for bottles of different heights, since differences of bottle height are compensated by a balancing piston (13) in the opposite direction, which alters the compensating volume (12) according to the sealing displacement path of the head (2) and thus always keeps the compressed measured volume exactly constant. The apparatus enables deviations in volume occurring in a series production process for plastic or glass bottles to be determined without the need to supply external air to the bottles. The measuring cycle is initiated by recording the pressure rise when the head (2) is placed upon the container (1).
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Stieger Othmar
Wenger Alfred
Brock Michael
Elpatronic AG
Williams Hezron E.
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