Measuring and testing – Fluid pressure gauge – Piston
Patent
1998-10-27
2000-10-03
Oen, William
Measuring and testing
Fluid pressure gauge
Piston
G01L 900
Patent
active
061257079
ABSTRACT:
A pressure detection device for detecting an increase of pressure acting thereon includes an electrically conductive device housing which has an accommodation bore extending inward from one end of the device housing and a slide bare extending between the accommodation bore and the other end of the device housing. A piston is slidably disposed within the slide bore and adopted to receive a pressure, and a terminal serving as one electric contact is fixed to the accommodation bore via an electrical insulator. A disk spring serving as the other electric contact deforms due to a pressing force of the piston and coming in contact with the terminal. The pressure detection device further comprises an electro-functional member attached to either the terminal or the disk spring in which the electro-functional member is changeable its electric resistance due to an impressed pressing force acting thereon. Further, at least one of a notch and a chamfer is provided on the electro-functional member for changing its electric resistance characteristic.
REFERENCES:
patent: 4326171 (1982-04-01), Shaw et al.
patent: 5353003 (1994-10-01), Maurer
patent: 5872345 (1999-02-01), Takahashi et al.
Patent Abstracts of Japan, vol. 009, No. 006 (P-326), Jan. 11, 1985, JP 59 155734, Sep. 4, 1984.
Asai Mitsuru
Haga Kyosuke
Kamiya Nobuo
Nakano Jiro
Suto Satoshi
Oen William
Toyoda Koki Kabushiki Kaisha
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