Automatic pencil

Coating implements with material supply – Solid material for rubbing contact or support therefor – Including means to advance material

Patent

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Details

401 79, B43K 2116

Patent

active

049175181

ABSTRACT:
An automatic pencil includes a front housing and a rear housing. A lead-propelling unit and a control unit are positioned within the front and rear housings respectively. The control unit is retained on the propelling unit. When the rear housing is continuously rotated relative to the front housing in a certain direction, a lead rod intermittently moves forward to project from the pencil tip. The propelling unit has a first engagement element, while the control unit has a second engagement element. Each of the first and second engagement elements has several sprocket teeth provided annularly on an end surface thereof. After use, the rear housing may be rotated relative to the front housing in the opposite direction so that the barbed ends of the second engagement element pull the barbed ends to the first engagement element backward. A compression spring helps the first engagement element, and hence the lead rod projecting from the pencil tip, to move backward.

REFERENCES:
patent: 3850531 (1974-11-01), Ackermann
patent: 4106874 (1978-08-01), Torii

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