Swing-type mechanical pencil

Details Swing-type mechanical pencil Swing-type mechanical pencil

1988-06-07

1990-05-29

Apley, Richard J.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 83, 401115, B43K 2102, B43K 2106, B43K 2404

Patent

active

049291076

ABSTRACT:
The present invention relates to a swing-type mechanical pencil wherein lead can be extended from a head member connected to an outer sleeve by swinging the outer sleeve to move a knocking hammer. The knocking hammer applies a lead-feeding action to feed the lead. A chuck shutting hammer is mounted between a spring bearing of a chuck ring sleeve retaining a chuck ring which is a component of the lead holder and a second spring connected with the chuck. An upward movement of the chuck shutting hammer forces the chuck into a chuck ring. This provides a positive action to shut the chuck preventing slipping of the lead when writing with the mechanical pencil. Manual advance of lead is provided by a slider in a recession an outer surface of the sleeve that engages the lead holder allowing the chuck to be manually opened to extend lead. The recess in the outer sleeve has a restriction that is engaged by a projection in the slider to lock the slider and lead holder against movement and prevent advancing of lead.

REFERENCES:
patent: 2385329 (1945-09-01), Buchanan
patent: 2492839 (1949-12-01), Brubaker
patent: 2561113 (1951-07-01), Hallberg
patent: 4205924 (1980-06-01), Sumita

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