Electric stippler with lobed cam-disk drive

Details Electric stippler with lobed cam-disk drive Electric stippler with lobed cam-disk drive

1984-08-09

1986-07-15

Ward, Robert S.

Geometrical instruments

Scriber

Writing

33 39R, 33 391, 81 92, B43L 1300, B43L 1324

Patent

active

045997993

ABSTRACT:
A draftsman's stippling device, small enough to be manually held during use, includes a vibratable cantelever bar supported in a small housing and having a free end projecting to the outside on which end a stippling pen is mounted. A cam disk having lobes about its periphery is adapted to be rotated by means of a battery powered mini-motor and reduction gearing at high speed against the upper surface of the bar. The lobes on the spinning cam disk successively depress the bar against the opposing tension of a return spring, whereby the bar and pen rapidly vibrate as a unit to enable stippling of a drawing surface disposed below the pen.

REFERENCES:
patent: 464801 (1891-12-01), O'Reilly
patent: 2337341 (1943-12-01), Miller et al.
patent: 2346474 (1944-04-01), De La Torre
patent: 2467083 (1949-04-01), Francis
patent: 2701417 (1955-02-01), Graham
patent: 2832140 (1958-04-01), Gaines
patent: 3325902 (1967-06-01), Schuman
patent: 3509786 (1970-05-01), Buttner
patent: 3638319 (1972-02-01), Barlow et al.
patent: 4204438 (1980-05-01), Binaris et al.

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