Geometrical instruments – Distance measuring – By flexible tape
Patent
1993-03-01
1995-03-28
Will, Thomas B.
Geometrical instruments
Distance measuring
By flexible tape
2423854, G01B 310
Patent
active
054005213
ABSTRACT:
A retractable tape measure having a housing with an opening therein through which a portion of the tape extends with the remainder of the tape being coiled around a spring biased reel having a hub around which the tape is coiled. Opposed annular ends on the hub retain the tape coiled therearound. One of the annular ends has a serrated circular peripheral edge with about 100 to about 150 serrations. A first locking mechanism is shiftably mounted on the housing movable vertically into and out of engagement with the tape. Second locking mechanism is shiftably mounted on the housing movable radially into and out of engagement with the serrated edges. The second locking mechanism has a plurality of serrations thereon which when engaged with a plurality of serrations on each annular end provide a positive lock for the tape coiled around the reel hub to prevent further withdrawal of the tape. The second locking mechanism may be spring biased.
REFERENCES:
patent: 2151130 (1939-03-01), Mattsson et al.
patent: 2777204 (1957-01-01), Graves
patent: 4205448 (1980-06-01), Asai
patent: 4765557 (1988-08-01), Kahmann
patent: 4856726 (1989-08-01), Kang
patent: 4903912 (1990-02-01), Coughlin
patent: 4998356 (1991-03-01), Chapin
patent: 5245761 (1993-09-01), Waldherr
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