Automatic drafting device

Details Automatic drafting device Automatic drafting device

1977-03-25

1978-08-08

Miller, Jr., George H.

Recorders

Markers and/or driving means therefor

With ink supply to marker

346141, G01D 1516

Patent

active

041060318

ABSTRACT:
Automatic drafting device of the type employing a tubular writing pen, particularly an adjustable sealing element which is used against the writing tip of the pen when the pen is in a retracted rest mode. The sealing element is laterally disengaged from the pen tip when the pen is an extended writing mode. The sealing element which may be in the form of an elastic spheroid prevents drying out of ink within the capillary channel when the pen is not in use.

REFERENCES:
patent: 1766249 (1930-06-01), Finch
patent: 2926058 (1960-02-01), Phillips, Jr.
patent: 2963337 (1960-12-01), Spalek
patent: 3346869 (1967-10-01), Stone
patent: 3824603 (1974-07-01), Bates et al.
patent: 3839721 (1974-10-01), Chen et al.
patent: 3864695 (1975-02-01), Nagashima et al.
patent: 3945734 (1976-03-01), Woodbridge

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