Lead writing instrument with selective locking of chuck

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

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Details

401 54, 401 94, B43K 2100, B43K 2122

Patent

active

051658127

ABSTRACT:
A refill lead writing instrument for stepped advancement of a lead has a spring biased clamping device for holding a lead in direction of its longitudinal axis against a writing pressure. The clamping device includes a clamping chuck supported in a clamping sleeve under a spring action and a longitudinally displaceable lead pipe against which the clamping chuck can abut. A gripping part is form-lockingly connected with a shaft so that the shaft and the gripping part are rotatable relative to one another about a common longitudinal axis. The shaft and the gripping part have opening of same diameters and provided with grooves. A longitudinally displaceable supporting pipe has strips guiding in the grooves, one of the grooves having an extension extending in direction of the writing pipe and formed as a recess in which one of the strips is turnable.

REFERENCES:
patent: 1780405 (1930-11-01), Sharrow
patent: 2055316 (1936-09-01), Sharrow
patent: 2162914 (1939-06-01), Feather
patent: 3713745 (1973-01-01), Horie
patent: 3947133 (1976-03-01), Kageyama et al.
patent: 4171170 (1979-10-01), Kageyama et al.
patent: 4269524 (1981-05-01), Hashimoto et al.
patent: 4884911 (1989-12-01), Oikawa

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