Multi-stranded return spring for fastening tool
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United States of America Patent
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Dec 22, 2015
Grant Date -
Sep 12, 2013
app pub date -
Mar 12, 2013
filing date -
Apr 3, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Compression return springs can be mounted on rails between the driver and an impact absorber. The springs include a plurality of wires twisted together to form a multi-stranded twisted wire member, which forms the coils of the spring. The springs can have an inner diameter that resists movement of the coils along the rails when the spring is at its free length, but has a mounted inner diameter that freely allows such movement. The coil-to-coil pitch of the spring can vary along its length. A motor initially rotates the flywheel without engaging the driver. The driver then contacts the rotating flywheel to propel the driver, which compresses the return springs against the impact absorbers as the driver travels from the returned position to the extended position.
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