Method of manufacturing a hollow spring member
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 18, 2023
Grant Date -
N/A
app pub date -
Mar 17, 2022
filing date -
Mar 30, 2016
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for manufacturing a hollow spring member having a hollow steel spring rod having terminal sealed portions at both ends thereof. Each terminal sealed portion has a rotationally symmetric shape in which an axis passing through a center of the spring rod is an axis of symmetry. Each terminal sealed portion has an end wall portion including an end face; an arc-shaped smoothly curved surface between an outer peripheral surface of the spring rod and the end face, and a hermetically closed distal-end-center closure portion on the axis passing through the center of the spring rod. The method includes forming each of the end portions of the spring rod by forming a chamfered portion on an inner or outer peripheral side of the end portion of a hollow wire, the end portion having an opening portion at a distal end, heating the end portion of the hollow wire having the chamfered portion, and spinning the heated end portion to be gathered toward the axis from the outer peripheral side by a jig. The end wall portion, which includes the distal-end-center closure portion, is formed by the distal end of the end portion being joined together on the axis.
First Claim
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Family
International Classification(s)
- 2022 Application Filing Year
- B60G Class
- 553 Applications Filed
- 331 Patents Issued To-Date
- 59.86 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- B60G Class
- 0 % this patent is cited more than
- 2 Age
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