Stud

Claim 2

In combination: a sheeted material or panel having first and second surfaces and a blind hole between said first and second surfaces; a fastener or the like including an axially rigid head and a shank; said head including a first annular flange; said head including a second annular flange of smaller radial extent than said first annular flange and defining with said first annular flange an undercut annular groove into which sheeted material is displaced by said first annular flange upon assembly to said sheeted material; said blind hole having an open end portion large enough to receive said second flange and having its opposite end portion closed by a part of said sheeted material to define a substantially planar closed end; and said head having a central recess juxtaposed with the part of said sheeted material closing said blind hole, the thickness of said sheet material being only slightly greater than the axial extent of said head.

Claim 3

The structure set forth in claim 1 wherein said first annular flange includes means tending to resist rotation of said fastener.

Claim 4

The structure recited in claim 1 wherein said shank is threaded.

Claim 5

The structure recited in claim 1 wherein said shank is slotted.

Claim 6

The structure recited in claim 2 wherein said means is a knurl.

Claim 7

The structure recited in claim 2 wherein said means comprises forming said first annular flange of noncircular shape.

Claim 8

In combination: a thin sheeted material or panel having first and second surfaces and a blind hole between said first and second surfaces; a fastener or the like including an axially rigid head and a shank; said head including an annular flange; said head including an annular pilot of smaller radial extent than said annular flange and defining with said annular flange an annular undercut groove into which sheeted material is displaced by said annular flange upon assembly to said sheeted material; said blind hole having an open end portion large enough to receive said pilot and having its opposite end portion closed by a thin part of said sheeted material; said head having a central recess juxtaposed with part of said sheeted material closing said blind hole; the thickness of said sheeted material being only slightly greater than the axial extent of said head; said annular flange including knurls on its outer periphery tending to resist rotation of said fastener; and said shank being threaded.

Claim 9

In combination: a thin sheeted material or panel having first and second surfaces and a blind hole between said first and second surfaces; a fastener or the like including an axially rigid head and a shank; said head including an annular flange; said head including an annular pilot of smaller radial extent than said annular flange and defining with said annular flange an annular undercut groove into which sheeted material is displaced by said annular flange upon assembly to said sheeted material; said blind hole having an open end portion large enough to receive said pilot and having its opposite end portion closed by a thin part of said sheeted material; said head having a central recess juxtaposed with part of said sheeted material closing said blind hole; the thickness of said sheeted material being only slightly greater than the axial extent of said head; said annular flange including knurls on its outer periphery tending to resist rotation of said fastener; and said shank being threaded.

Claim 10

A one-piece clinch-type fastener adapted to be secured to thin panels comprising: an axially rigid head and an externally threaded shank being solid in transverse cross section; said head including a first annular flange; said head including a second annular flange; said first annular flange being between said second annular flange and said shank; said second annular flange being of smaller radial extent than said first annular flange and defining with said first annular flange an undercut annular groove to receive panel material displaced by said head during assembly of said fastener to a panel and said second annular flange having a centrally recessed end face on the side of said head opposite said shank.

Claim 11

A one-piece clinch-type fastener adapted to be secured to thin panels comprising: an axially rigid head and an externally threaded shank being solid in transverse cross section; said head including a first annular flange; said head including a second annular flange; said first annular flange being between said second annular flange and said shank; said second annular flange being of smaller radial extent than said first annular flange and defining with said first annular flange an undercut annular groove to receive panel material displaced by said head during assembly of said fastener to a panel and said second annular flange having a centrally recessed end face on the side of said head opposite said shank.

Claim 12

The structure set forth in claim 8 wherein said first annular flange includes means tending to resist rotation of said fastener.

Claim 13

The structure recited in claim 9 wherein said means is a knurl.

Claim 14

The structure recited in claim 9 wherein said means is of noncircular shape.

Claim 15

A one-piece clinch-type fastener adapted to be secured to thin panels comprising: an axially rigid head and a shank being solid in transverse cross section; said head including a first circular flange; said head including a second circular flange; said first annular flange being between said second annular flange and said shank; said second annular flange being of smaller radial extent than said first circular flange and defining with said first circular flange an undercut circular groove; said second circular flange having a concave end face defining a circular recess centrally disposed on said second circular flange on the side of said head opposite said shank to receive panel material displaced by said head during assembly of said fastener to a panel; said undercut groove being disposed radially outwardly of said recess and concentric therewith; said first circular flange including knurls tending to resist rotation of said fastener; and said shank being externally threaded.

Claim 16

A one-piece clinch-type fastener adapted to be secured to thin panels comprising: an axially rigid head and a shank being solid in transverse cross section; said head including a first circular flange; said head including a second circular flange; said first annular flange being between said second annular flange and said shank; said second annular flange being of smaller radial extent than said first circular flange and defining with said first circular flange an undercut circular groove; said second circular flange having a concave end face defining a circular recess centrally disposed on said second circular flange on the side of said head opposite said shank to receive panel material displaced by said head during assembly of said fastener to a panel; said undercut groove being disposed radially outwardly of said recess and concentric therewith; said first circular flange including knurls tending to resist rotation of said fastener; and said shank being externally threaded.

Claim 17

A one-piece clinch-type terminal adapted to be secured to thin panels comprising: an axially rigid head and an elongated shank solid in transverse cross section but for a slot at the end opposite said head; said head including a first annular flange; said head including a second annular flange; said first annular flange being between said second annular flange and said shank; said second annular flange being of smaller radial extent than said first annular flange and defining with said first annular flange an undercut annular groove to receive panel material displaced by said head during assembly of said terminal to a panel; and said second annular flange having a centrally recessed end face on the side of said head opposite said shank.

Claim 18

A one-piece clinch-type terminal adapted to be secured to thin panels comprising: an axially rigid head and an elongated shank solid in transverse cross section but for a slot at the end opposite said head; said head including a first annular flange; said head including a second annular flange; said first annular flange being between said second annular flange and said shank; said second annular flange being of smaller radial extent than said first annular flange and defining with said first annular flange an undercut annular groove to receive panel material displaced by said head during assembly of said terminal to a panel; and said second annular flange having a centrally recessed end face on the side of said head opposite said shank.