Portable distance measuring device with pull out measuring filam

Details Portable distance measuring device with pull out measuring filam Portable distance measuring device with pull out measuring filam

1987-03-26

1988-09-06

Martin, Jr., William D.

Geometrical instruments

Area integrators

Electrical

224252, 224269, 224904, G01B 312

Patent

active

047682906

ABSTRACT:
The present invention provides a portable distance measuring device having a housing, a thread measuring member mounted to the housing and a spool of filament in the form of a thread or a thin metal wire which is pulled out of the housing and operates the thread measuring member to provide accurately measured distances. The filament is wound for low resistance unwinding from the spool which is itself fixed against rotation to prevent spool inertia breakage of the filament.

REFERENCES:
patent: 209658 (1878-11-01), Comly
patent: 2676411 (1954-04-01), Horch
patent: 3804420 (1974-04-01), Boyd
patent: 4580347 (1986-04-01), McKnight
patent: 4587738 (1986-05-01), Kang

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