Hollow spring member and manufacturing method therefor
Number of patents in Portfolio can not be more than 2000
United States of America
Stats
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Mar 29, 2022
Grant Date -
Jan 31, 2019
app pub date -
Sep 28, 2018
filing date -
Sep 28, 2018
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A terminal sealed portion is formed on an end portion of a hollow rod made of steel. An enclosed space is formed on an inner side of the hollow rod. At an end of the enclosed space, a terminal gap is formed. A volatile powdered rust inhibitor is supplied in the enclosed space. As the volatile powdered rust inhibitor is vaporized, the enclosed space is turned into a rust-inhibiting atmosphere. As the vaporized component of the volatile powdered rust inhibitor is adsorbed to an inner surface of the enclosed space, an inner surface rust-inhibiting film is formed. The vaporized component also enters inside the terminal gap, and forms a terminal rust-inhibiting film.
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