Contact-actuated light pencil

Details Contact-actuated light pencil Contact-actuated light pencil

1980-09-04

1981-12-22

Grieb, William H.

Education and demonstration

Question or problem eliciting response

Correctness of response indicated to examine by...

G09B 700

Patent

active

043068707

ABSTRACT:
A contact-actuated light pencil for use in detecting electrically conducting areas or materials. The light pencil includes a hollow pencil body having an aperture at one end, a tubular electrical contact at the one end which lines the aperture, and a conducting probe extending from within the pencil body through the tubular electrical contact. The probe is electrically isolated from direct contact with the tubular electrical contact by an insulator, situated within the electrical contact, which has an internal aperture for through-passage of the probe. The probe is slidably situated within the internal aperture and is resiliently biased by a spring such that a portion of the probe normally extends outside of the pencil body. A conducting path leads between the electrical contact and the probe and includes a battery and lamp which is illuminated when electrical current flows. When a conducting material is simultaneously contacted between the probe and the electrical contact, a circuit is completed and current flows through the conducting path, illuminating the lamp to give usual indication that conducting material has been encountered.

REFERENCES:
patent: 2546666 (1951-03-01), Fleischer
patent: 3818610 (1974-06-01), Baba et al.

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