Ball chain and method of manufacturing the same
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United States of America Patent
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May 18, 2010
Grant Date -
Jul 23, 2009
app pub date -
Nov 26, 2008
filing date -
Jan 21, 2008
priority date (Note) -
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Abstract
A ball chain including metal balls with a small wall thickness and can withstand a large tensile load are provided. A method of manufacturing the same includes rounding a piece of metal to form rotation-axis symmetric bodies (22) and connecting the rotation-axis symmetric bodies (22) in a chain-like manner with connecting shafts. Each of the connecting shafts has connecting heads on both end portions. Each of the rotation-axis symmetric bodies (22) has a butt seam (24) in a direction of a rotation axis of the rotation-axis symmetric body and a weld part (25) at least one part of the butt seam (24).
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