Mechanical pencil with automatic and manual lead advance

Details Mechanical pencil with automatic and manual lead advance Mechanical pencil with automatic and manual lead advance

1977-03-16

1979-04-17

Coven, Edward M.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 67, B43K 2116

Patent

active

041498135

ABSTRACT:
A mechanical pencil has an axially elongated hollow pencil body in which is slidable a tubular seat member. A lead-protecting sleeve is axially displaceable in the pencil body between a front position and a rear position and is urged into the front position with a relatively strong spring force. At least two jaws are axially displaceable on the seat and are moved radially closer as they move backwardly from the tip so as to grip a lead that projects backwardly from the lead-projecting sleeve. A relatively weak spring urges these jaws backwardly in the seat. An O-ring is provided in the lead-projecting sleeve so that each time the pencil tip is lifted from the writing surface the lead is automatically pulled forwardly by the strong spring force through the jaws. Similarly forward displacement of the seat in which the jaws rest allows for manual advance of a lead gripped by the jaws and passing through the lead-protecting sleeve.

REFERENCES:
patent: 1033529 (1927-06-01), Hoffman
patent: 1644740 (1927-10-01), Morlock
patent: 3850531 (1974-11-01), Aukermann
patent: 3899256 (1975-08-01), Mitsuyg
patent: 4003664 (1977-01-01), Butkg

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