Optical sensing system for extensible tape rules

Details Optical sensing system for extensible tape rules Optical sensing system for extensible tape rules

1981-05-27

1984-01-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356395, H01J 314

Patent

active

044278837

ABSTRACT:
The present invention relates to coilable extensible rules or the like. More specifically, the present invention is concerned with a new and improved optical sensing system for extensible tape rules of the type that provide a visual display of the measurment readings, such as the digital tape rule described in the Hildebrandt et al U.S. Pat. No. 4,161,781, the disclosure of which is incorporated herein by reference.

REFERENCES:
patent: 3175093 (1965-03-01), De Lang
patent: 3573468 (1971-04-01), Lang
patent: 3796498 (1974-03-01), Post
patent: 4164816 (1979-08-01), Bergkvist
patent: 4263506 (1981-04-01), Epstein

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