Pencil sharpener with acoustical and lamplight indicating effect

Details Pencil sharpener with acoustical and lamplight indicating effect Pencil sharpener with acoustical and lamplight indicating effect

1991-04-22

1992-11-10

Yost, Frank T.

Woodworking

Special-work machine

Pencil sharpening

30451, 30457, B43L 2302

Patent

active

051615878

ABSTRACT:
The present invention is directed to a pencil sharpener that incorporates a conductive sharpening blade element for sharpening the pencil wherein the blade element is positioned along an inner wall surface of a bore hole so as to contact an outer surface of the pencil. A conductive leaf spring opposingly positioned with the blade element contacts a nib of a pencil when the pencil is sharpened by the blade element, whereby the leaf spring forms an electrical contact with the blade element through the nib of the pencil. An integrated circuit sound device for producing an audible signal is operatively connected with the blade element and leaf spring so as to generate warning signals through an indicating lamp and a buzzer.

REFERENCES:
patent: 3134365 (1964-05-01), Hori
patent: 3486540 (1969-12-01), Hori
patent: 3556182 (1971-01-01), Tanigami
patent: 3678975 (1972-07-01), Imanishi et al.
patent: 3746061 (1973-07-01), Nakazaki
patent: 5052453 (1991-10-01), Chen

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