Mechanical pencil with automatic lead advance

Details Mechanical pencil with automatic lead advance Mechanical pencil with automatic lead advance

1985-04-25

1987-03-17

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 81, 401 94, B43K 2116, B43K 2122

Patent

active

046503595

ABSTRACT:
A mechanical pencil having a chuck mechanism which permits the lead to advance but prevents the lead from retracting, a first slider, a second slider which is retractable progressively as a writing pressure is applied, a first engagement device for holding the second slider at its retracted position and a second engagement device for holding the first slider at its retracted position. The progressively retracted second slider is released to advance to the forward original position by applying a further writing pressure to cause a retraction of the first slider. Then, the second slider is advanced forwardly together with the lead so that the lead is advanced to a writing position.

REFERENCES:
patent: Re15968 (1924-12-01), Waring
patent: 2184911 (1939-12-01), Fend
patent: 2865330 (1958-12-01), Swank
patent: 4459057 (1984-07-01), Hashimoto et al.
patent: 4478529 (1984-10-01), Morio
patent: 4504163 (1985-03-01), Hashimoto et al.
patent: 4521126 (1985-06-01), Sakaoka et al.
patent: 4538934 (1985-09-01), Brunner

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