COIL SPRING
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United States of America Patent
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Issued Date -
Jun 9, 2022
app pub date -
Dec 7, 2020
filing date -
Dec 7, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
According to an embodiment, a coil spring includes a wire rod having an end and the other end. The wire rod of the coil spring includes, with regard to a section of the wire rod, a round section potion of an effective spring part, a square section portion in which the section is substantially square, and a taper portion. The square section portion includes an end turn part. A length of each side of the section of the square section portion is less than or equal to a square root of ½ multiplied by a diameter of the wire rod of the round section portion. In the taper portion, from the round section portion to the square section portion, the section changes from a round shape to substantially a square shape, and a sectional area is decreased.
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