Automatic lead advancing mechanism for a mechanical pencil

Details Automatic lead advancing mechanism for a mechanical pencil Automatic lead advancing mechanism for a mechanical pencil

1983-08-05

1985-09-03

Bratlie, Steven A.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to limit tool projection

401 65, 401 67, 401 80, 401 81, 401 94, B43K 2122, B43K 2120

Patent

active

045389349

ABSTRACT:
An automatic lead advancing mechanism for a mechanical pencil has at its writing point a lead guide tube which is movable axially against a clamping member to cause radially movable components of the clamping member to clamp the lead therein during the writing position of the pencil. The lead guide tube moves axially inwardly against a force exerted by a compression spring interposed between the clamping member and a thrust member, a portion of which is engaged by the lead guide tube and another portion of which has a beveled surface engaging a correspondingly beveled surface on the clamping member. The co-acting beveled surfaces exert both axial and radial forces to the clamping member.

REFERENCES:
patent: 1700246 (1929-01-01), Woelm
patent: 1759931 (1930-05-01), Barberon
patent: 2452907 (1948-11-01), Collura
patent: 3424535 (1969-01-01), Schischkow
patent: 3864046 (1975-02-01), Butka

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