Potentiometer

Details Potentiometer Potentiometer

1991-09-11

1992-03-10

Lateef, Marvin M.

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

338167, 338170, H01C 1038

Patent

active

050952994

ABSTRACT:
In a potentiometer applied to the EGR system in automobiles, a relative motion between a printed circuit card and a holder, through which the card is slidably inserted, is blocked to prevent unwanted wear of a resistor on the printed circuit card when the potentiometer is subjected to vibrations from the EGR valve that may occur when the valve is on the verge of being opening, i.e., when the measured value is in the minimum range. The relative motion is prevented either by inserting an elastic member between the holder and the printed circuit card; by forming the spring seat of the holder--which is always urged by a spring toward the shaft and also restricted by a stopper--inclined with respect to the holder's sliding direction so that the holder is applied with an uneven spring load and is inclined to firmly hold the card with its ends; or by installing a spring between the upper end of the shaft and the facing end of the holder to absorb the vibration. The relative motion is also prevented by installing a spring between the bottom of the potentiometer case and the upper end of the shaft inside the case to urge the shaft to engage with the lower end of the holder. This keeps the shaft parted from the valve when the valve opening is the minimum.

REFERENCES:
patent: 3477057 (1969-11-01), Bang
patent: 3932831 (1976-01-01), Shirley et al.
patent: 4198030 (1980-04-01), Jackson et al.
patent: 4357592 (1982-11-01), Okuya
patent: 4420273 (1983-12-01), Blessing et al.
patent: 4473814 (1984-09-01), Blessing
patent: 4599671 (1986-07-01), Kemeny et al.
patent: 4665376 (1987-05-01), Heinrich

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