Vibration sensor including a reduced capacity lower portion for

Details Vibration sensor including a reduced capacity lower portion for Vibration sensor including a reduced capacity lower portion for

1991-04-24

1993-06-15

Williams, Hezron E.

Measuring and testing

Vibration

Sensing apparatus

73 35, 310329, G01H 1108

Patent

active

052188701

ABSTRACT:
A vibration sensor is provided in which the depth of a caulked portion of the sensor's case is increased so as to increase the capacity of a recess defined between this caulked portion and the cover. The volume of a potting agent filling the recess can thereby be increased to improve the airtightness of the caulked portion and the reliability of the vibration detector. A vibration plate having cutouts circumferentially spaced along an outer, peripheral portion may be used in the vibration detector if the volume of the space formed on a lower side of the vibration plate is limited to about a few to ten percent of that of the space formed on the opposite, terminal side. The expansion of air in the spaces caused by a thermal shock is therefore substantially equal to the expansion of air contained in the space on the terminal side alone, so that vibration sensor can maintain sufficient airtightness and can be improved in reliability.

REFERENCES:
patent: 4129042 (1978-12-01), Rosvold
patent: 4193647 (1980-03-01), Guess et al.
patent: 4371804 (1983-02-01), Peng et al.
patent: 4393688 (1983-07-01), Johnston et al.
patent: 4483180 (1984-11-01), Ohbuchi et al.
patent: 4630465 (1986-12-01), Hatton
patent: 4704894 (1987-11-01), Inuzuka et al.
patent: 4723087 (1988-02-01), Fox et al.
patent: 4727279 (1988-02-01), Peng
patent: 5053671 (1991-10-01), Kobayashi et al.
patent: 5118981 (1992-06-01), Kobayashi et al.

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