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US 4,270,870 AGranted
Mechanical pencil with chuck closing by normal writing grip
AssigneeAncos Co., Ltd.
InventorsYasuyuki Hashimoto, Osamu Torii
Life of this patent
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Abstract
Mechanical pencil construction wherein the operational movements to advance the lead are accomplished by providing one or more elastically deformable ribs or spring biased cam members that extend outwardly through axial slots in the pencil body in the normal finger gripping area. The radially inward depression of such ribs or cam members by the writer's fingers is converted to axial motion within the pencil, to thereby effect the necessary lead gripping and advancing operations.
Claims8
A mechanical pencil, comprising:
- (a) a hollow elongated body having at least one axial slot therein disposed in the normal finger gripping area of the body,
- (b) a slotted resilient chuck disposed in said body for gripping a pencil lead when closed and for releasing said lead when open, said chuck being selfbiased to an open state,
- (c) a chuck closing collar disposed in said body for cammingly engaging said chuck to close same,
- (d) a depressable member disposed in said slot and biased to extend radially outwardly through said slot, and
- (e) means for converting the radially inward depression of said member into linear axial relative movement between said chuck and said collar, whereby the normal gripping of said pencil pursuant to the commencement of writing inherently inwardly depresses said member to thereby cause the chuck to grip the lead.
2 more elements
Dependencies are inferred from the claim text.