Writing instrument with ink quantity of level detecting function

Details Writing instrument with ink quantity of level detecting function Writing instrument with ink quantity of level detecting function

1988-04-01

1989-12-26

Apley, Richard J.

Coating implements with material supply

With signal or indicator

401142, 401190, 401209, 73307, 116204, 222 51, 346 17, 346140A, B43K 2900, B43K 706

Patent

active

048894427

ABSTRACT:
A writing instrument with ink quantity or level detecting function which has an ink tube containing ink, and a float so arranged in intimate contact with the rear end surface of the ink in the ink tube as to be driven in contact with the rear end surface of the ink upon decrease of the ink in the ink tube. Further, a magnetic sensor is further provided externally at the writing instrument, while the float is formed of magnetic material. Thus, lack of the ink in the ink tube of this writing instrument can be readily detected.

REFERENCES:
patent: 559034 (1896-04-01), Laughlin
patent: 2582043 (1952-01-01), Krahulec
patent: 3389603 (1968-06-01), Jacobs, III
patent: 3495920 (1970-02-01), Spaulding
patent: 3775015 (1973-11-01), Tsunoda et al.
patent: 4014010 (1977-03-01), Jinotti
patent: 4350458 (1982-09-01), Murahara et al.
patent: 4415886 (1983-11-01), Kyogoku et al.
patent: 4532800 (1985-08-01), Coleman

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