Stock material or miscellaneous articles – All metal or with adjacent metals – Intermediate article
Patent
1983-06-02
1985-09-24
Rutledge, L. Dewayne
Stock material or miscellaneous articles
All metal or with adjacent metals
Intermediate article
428595, B21D 3902
Patent
active
045432970
ABSTRACT:
A stiff ring useful for such purposes as electric motor housings. The ring is a single piece, usually having a ratio of diameter to wall thickness less than about 40:1. The ring consists of a single piece of steel cut from a continuous strip having a tongue at one end and a recess at the other. These have interfering tapered locking segments to prevent separation, and are interlinked with one another. The process for making the ring comprises forming the strip in a U-shape around a cylindrical mandrel by interaction with a first half cylindrical die part, and then while holding the bent strip with the mandrel and first die part pressing the free ends so that they symmetrically pass along the inside surface of a second semi-cylindrical die part with the interlocking ends of the strip shaped and riding the die in such a manner that the tongue and recess inter-engage one another with a minimum of physical interference. Then the interlocking joint is coined by bringing the die parts against the ring while it is still supported on the mandrel. The tongue has extensions ahead of its locking section to permit single stroke non-destructive engagement of the interlocking ends. The tongue and recess ends can be angulated to further aid this engagement.
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Mon Donald D.
Rutledge L. Dewayne
Zimmerman John J.
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