Double-chuck mechanical pencil

Details Double-chuck mechanical pencil Double-chuck mechanical pencil

1995-11-27

1999-09-07

Bratlie, Steven A.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 65, B43K 2122

Patent

active

059476206

ABSTRACT:
A double-chuck mechanical pencil comprises: a barrel; a barrel cap attached to the barrel; a lead tank axially slidably inserted in the barrel; a back chuck fixedly joined to the front end of the lead tank; a chuck ring loosely fitted on the chucking head of the back chuck; a tubular member disposed so as to surround the front portion of the lead tank; a back elastic member placed in the tubular member so as to bias the lead tank backward; a coupling member combined with the tubular member, and provided in its inner circumference with stopping portions with which the tubular member and the chuck ring come into contact, respectively; a front chuck fixedly joined to the front portion of the coupling member; and a front elastic member interposed between the barrel cap and the coupling member so as to bias the coupling member backward. A rotation prohibitor permits the axial movement of the coupling member and prohibits the rotation of the same relative to the tubular member. A tail cap is attached to the back end of the barrel and a push cap is detachably put on the back end of the lead tank. Another rotation prohibitor permits the axial movement of the push cap and prohibits the rotation of the same relative to the tail cap.

REFERENCES:
patent: 2203160 (1940-06-01), Kovacs
patent: 3814524 (1974-06-01), Sperti
patent: 4165941 (1979-08-01), Kageyama et al.
patent: 4627756 (1986-12-01), Kageyama
patent: 5009533 (1991-04-01), Kageyama

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