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US 4,363,581 AGranted
Sheet metal threaded article
OwnerJames F. Peaseinventor
Life of this patent
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OwnerJames F. Peaseinventor
Estimating the term…
A thin sheet of metal is drawn in progressive steps to form a hollow body having a closed end tubular portion integrally connected to an outwardly projecting cup-shaped flange portion. A section of the tubular portion is crimped inwardly against a threaded mandrel to form helical threads and diametrically opposed and outwardly projecting double wall rib portions. The mandrel is unthreaded to form a sheet metal insert which is adapted to be supported within a mold cavity by a cylindrical support pin during injection of a plastics material into the cavity and around the insert. The threads and rib portions positively secure the sheet metal insert within the molded plastics article or part for receiving a threaded fastener. The insert may also be used in a metal part or casting or in a wood article, wherever threads are required or desirable.
A sheet metal threaded article comprising a drawn sheet metal hollow body having an elongated tubular portion projecting from an integrally connected base portion defining an opening, said tubular portion including an inwardly crimped tubular section having a corrugated wall configuration in axial cross-section and forming helical threads, said inwardly crimped tubular section including at least one axially extending folded sheet metal rib of double wall thickness, and said helical threads being adapted to receive a threaded member.
A sheet metal threaded article adapted to be inserted into a hardenable material to form a threaded hole within a part molded of the material, said article comprising a drawn sheet metal hollow body having an elongated tubular portion projecting from an integrally connected base portion defining an opening, said tubular portion including an inwardly crimped tubular section having a corrugated wall configuration in axial cross-section and forming helical threads, said inwardly crimped tubular section including a plurality of circumferentially spaced and axially extending folded sheet metal ribs each having a double wall thickness, said inwardly crimped tubular section being effective to retain said body within the material in response to receiving a threaded member, and said ribs being effective to prevent rotation of said body within the material when the threaded member is tightened.
Dependencies are inferred from the claim text.