Structure of pencil sharpener

Details Structure of pencil sharpener Structure of pencil sharpener

1990-11-26

1991-10-01

Bray, W. Donald

Woodworking

Special-work machine

Pencil sharpening

144 286, 144 2872, B43L 2302

Patent

active

050524534

ABSTRACT:
A pencil sharpener, comprising an audio circuit reporter which gives audio signal to report that pencil has been well sharpened. The audio circuit reporter is comprised of an audio circuit, a dry battery and a speaker. The two opposite terminal ends of the audio circuit are respectively connected to two electric contacts which are electrically connected by the protruding pencil lead of the pencil which is well sharpened in the pencil sharpener, so that the audio circuit gives an audio signal through the speaker to report that the pencil which is inserted in the pencil sharpener has been well sharpened.

REFERENCES:
patent: 2408767 (1946-10-01), Fleming
patent: 2561438 (1951-07-01), Duchesneau
patent: 3678975 (1972-07-01), Imanishi et al.
patent: 3746061 (1973-07-01), Nakazaki

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