Geometrical instruments – Area integrators – Electrical
Patent
1988-02-12
1989-09-12
Levy, Stewart J.
Geometrical instruments
Area integrators
Electrical
33178E, G01B 508
Patent
active
048647330
ABSTRACT:
Among the many challenges in the manufacture of oil seal rings of elastomeric material is to create a seal whose sealing surface is within certain critical dimensions, usually in terms of a nominal diameter plus or minus a tolerance. There have been several methods available to test oil seals to determine the actual diamter of the sealing surface. These require considerable experience and training. Repeatability can be adversely affected by a number of factors. The subject invention includes an apparatus which combines a light box with a controllably expansible gauge band. The expansion of the band is monitored by an electronic position indicator. In operation, the seal to be tested is placed over the properly selected gauge band on the light box. The user adjusts the vernier to expand the band until a "light seal" is obtained, i.e., when any space between the smooth outer diameter of the band and the lip of the the seal is just closed. At that point, a reading of the position detector is taken. The reading can be in terms of the actual diameter determined by this test but more desirably as a deviation from the nominal diameter. The comformable nature of the band, combined with its operation wherein the circumference dimension is directly measured and the diameter determined from this dimension, makes the subject invention especially useful for measuring even oval portions of other components.
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Levy Stewart J.
O'Connor Edna M.
O'Connor Gregory W.
Raevis Robert R.
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