Rotational operation device
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United States of America Patent
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Jan 30, 2018
Grant Date -
Dec 8, 2016
app pub date -
May 23, 2016
filing date -
Jun 5, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A rotational operation device includes a holder fixed to a rotation shaft, a torsion coil spring, and a case accommodating the holder and the torsion coil spring. The torsion coil spring includes a coil, fitted to the rotation shaft, and two protrusions, located at opposite ends of the coil. When the rotation shaft is rotated, the case restricts movement of the first protrusion, and the holder pushes the second protrusion in a rotation direction of the rotation shaft. The case includes a first groove that receives the first protrusion. The holder includes a second groove that receives the second protrusion. The first and second protrusions are spaced apart by an invariable interval set by a fixed length between the first and second grooves. The fixed length is set to a distance that produces a gap between coil windings when the coil is in a load-free state.
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