| 摘要 |
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.
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