Plotter pen with coaxial reservoir

Details Plotter pen with coaxial reservoir Plotter pen with coaxial reservoir

1991-04-19

1992-12-22

Bratlie, Steven A.

Coating implements with material supply

Including stylus

401217, 401260, 346140A, B43K 816

Patent

active

051729954

ABSTRACT:
A stylo pen tip, in particular for use in drafting plotters, has a writing tube (5) in the front end, into which a cleaning wire (6) extends from the rear, which is fixed at the front end of a drop weight body (7) which is movable back and forth axially to a limited degree in an inner bore (8). The inner bore (8) is connected with a writing fluid reservoir (4), which surrounds at least the front section of the inner bore. Coaxially to the inner bore (8), a pressure equalization chamber (11) is provided, the inner end of which is connected with the writing fluid reservoir (4) and the outer end of which is connected with ambient air. At least a portion of the pressure equalization chamber (11) is surrounded by the writing fluid reservoir (4). The inner end of the pressure equalization chamber (11) lies on the front end of the inner bore and its outer end in the area of the back end of the stylo pen tip.

REFERENCES:
patent: 1352340 (1920-09-01), App
patent: 1447632 (1923-03-01), Schmidt
patent: 2397229 (1946-03-01), Bird
patent: 2504649 (1950-04-01), Chesler
patent: 3459486 (1969-08-01), Matschkal
patent: 3741668 (1973-06-01), Danjzcek et al.
patent: 4770558 (1988-09-01), Frietsch

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