Mechanical pencil with a fluid actuator

Details Mechanical pencil with a fluid actuator Mechanical pencil with a fluid actuator

1989-01-10

1990-03-27

Apley, Richard J.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 65, 401 82, B43K 2116

Patent

active

049115693

ABSTRACT:
A writing instrument includes a hollow body, a depression mechanism including a grip unit having an outer periphery radially displaceable in accordance with a gripping force exerted by writer's fingers, the depression mechanism including an axially displaceable member which moves axially in accordance with an increase of a pressure of due to radial displacement of the grip unit and which returns to its original position in accordance with a decrease of a pressure of the grip unit, the axially displaceable member being provided in association with the grip unit, a writing member including lead with a writing tip, and a writing member actuating mechanism for moving the writing tip to a writing position. The writing member actuating mechanism includes a normally open chuck, a lead holder positioned between the chuck and tip for constantly holding the lead, and an axially moveable tightening mechanism for engaging with and disengaging from the chuck and disposed on a side of the chuck opposite the writing tip. The chuck moves backwardly relative to the lead holder by a predetermined distance at the start of application of a gripping force, and advances together with the lead relative to the lead holder at the start of release of the gripping force.

REFERENCES:
patent: 2988784 (1961-06-01), Lorenian
patent: 3576374 (1971-04-01), Lile
patent: 4270870 (1981-06-01), Hashimoto et al.
patent: 4358210 (1982-11-01), Hashimoto et al.
patent: 4475834 (1984-10-01), Bean
patent: 4521126 (1985-06-01), Sakaoka et al.

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