ONE-WAY RESISTANCE ROLL-UP APPARATUS
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United States of America Patent
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Issued Date -
Jan 15, 2015
app pub date -
Jul 15, 2013
filing date -
Jul 15, 2013
priority date (Note) -
Abandoned
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Abstract
A roll-up apparatus, which provides a unidirectional resistance, includes an outer barrel, an inner barrel, damping oil, a clutch device, and a driving device. The outer and the inner barrels each has a concentric-circle structure therein. The inner barrel has first ratchet teeth. The outer barrel is fitted to the inner barrel, and the concentric-circle structures are engaged. The damping oil is received in a space between the concentric-circle structures. The clutch device has second ratchet teeth to disengage and engage the first ratchet teeth of the inner barrel when the clutch device is moved to a first position and a second position. The driving device moves the clutch device between the first position and the second position.
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