SPRING APPARATUS
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United States of America Patent
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Issued Date -
Dec 24, 2020
app pub date -
Mar 12, 2019
filing date -
Mar 14, 2018
priority date (Note) -
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Abstract
A spring apparatus (10), including: a spring (12); an elongated object (18A) disposed within and along the spring (12); and a mode-changing assembly (16), for providing a first mode in which a portion (38) of the spring (12) being along the elongated object (18A) is not springy, and a second mode in which an entire of the spring (12) is springy.
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