Writing instrument having multiple writing elements

Details Writing instrument having multiple writing elements Writing instrument having multiple writing elements

1979-03-22

1981-09-22

Michell, Robert W.

Coating implements with material supply

Projectable and retractable tool

Including retraction spring and projected-position retainer

401 17, 401 19, 401 33, B43K 516, B43K 2402

Patent

active

042907071

ABSTRACT:
An improved writing instrument having multiple writing elements, i.e., a mechanical lead pencil element and at least one other writing element, which are selectively movable into operating position by rotation of a cam and wherein lead can be moved from the pencil element by axial movement of the housing element. The instrument comprises a sleeve-type cam having a transformed end face cam surface, the contour of which preferably comprises downwardly sloping edges having a generally elliptical shape which guide a pair of cam followers respectively associated with the writing elements. According to the invention, the cam has an upper, substantially vertical portion which allows the lead of the mechanical pencil to be pushed out from the supporting element by urging the cam axially downwardly whereby the cam follower associated with the other writing element can slide adjacent to the vertically extended cam portion, the cam being fixed to a housing element which can rotate and axially move with the cam element.

REFERENCES:
patent: 3266465 (1966-08-01), Ganz
patent: 4148591 (1979-04-01), Tomura
patent: 4227822 (1980-10-01), Kokubu

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