Tape measure with epicyclic gear drive for tape retraction
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United States of America Patent
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Jun 25, 2024
Grant Date -
Nov 17, 2022
app pub date -
Jul 25, 2022
filing date -
Mar 22, 2017
priority date (Note) -
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Abstract
A tool, such as a tape measure, including a spring-based retraction system is shown. The retraction system utilizes an epicyclic gear train coupled between the tape blade winding reel and a rotating arbor or axle within the tape measure. A spiral spring has an outer end coupled to the reel and an inner end coupled to the axle. The gear train may be a reduction gear train such that the axle rotates slower than the reel. By coupling the spiral spring between the gear train input and gear train output, high energy density springs may be used, which may allow for decrease in housing size, increase in tape length or thickness for a given housing size, and/or advantageous retraction speed control.
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