Hook structure for spiral spring
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United States of America Patent
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May 1, 2012
Grant Date -
May 27, 2010
app pub date -
Oct 20, 2009
filing date -
Nov 25, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A second spiral spring is smaller than a first spiral spring and is housed in an open space in the center of the first spiral spring. A folded portion that is formed in an inner end of the first spiral spring and a folded portion that is formed in an outer end of the second spiral spring are hooked in a latch plate, under tension, that is cut and raised from a side. A receiving space is formed between the latch plate and an initial winding portion that starts winding in a curved shape from the inner end of the first spiral spring so as to house a tip of the folded portion of the outer end of the second spiral spring that is hooked in the latch plate.
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