Automatic pencil device for automatic drafting and writing machi

Details Automatic pencil device for automatic drafting and writing machi Automatic pencil device for automatic drafting and writing machi

1983-08-05

1989-02-28

Goldberg, E. A.

Recorders

Markers and/or driving means therefor

Stylus feature

401 53, 33 181, G01D 1516, B43L 1300, B41J 1120

Patent

active

048090239

ABSTRACT:
An automatic lead pencil device has a casing which is releasably mountable in a bracket of a drafting machine. Within the casing, there is a clamp sleeve in which a clamping member is axially movable for clamping and releasing a lead during use of the pencil device. An axial movable lead guide tube projects outwardly of the casing in the rest position, and there is a pencil brake within the lead guide tube. The contact zone between the clamping member and the clamp sleeve is constructed so as to be of the non-self-locking type. There is an operative connection between the clamping member and the lead guide tube such that the clamping member is closed when the lead guide tube moves axially inwardly to assume the working position and opens when the lead guide tube moves axially outwardly toward a rest position.

REFERENCES:
patent: 1430204 (1922-09-01), Waring
patent: 3345640 (1967-10-01), Sicking
patent: 3424535 (1969-01-01), Schischkow
patent: 4015269 (1977-03-01), Edo
patent: 4346392 (1982-08-01), Isobe
patent: 4426783 (1984-01-01), Gerber
patent: 4452544 (1984-06-01), Sumita
patent: 4478529 (1984-10-01), Morio
patent: 4490061 (1984-12-01), Katz
patent: 4538934 (1985-09-01), Brunner

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