High intensity peening flaps with fastener, and wheels incorporating same

A peening flap, comprising:

• a strap including a first strap portion, a second strap portion, a first aperture formed in said first portion and a second aperture formed in said second portion;
• peening means mounted on said strap;
• and
• a fastener four securing said first and second strap portions together under compression, said fastener including:
• a shaft extending through said apertures, said shaft including a first end and a second end;
• and
• a first head adjoining said first end and a second head adjoining said second end;
• wherein said first and second strap portions have a combined thickness and are secured between said first and second heads;
• and
• wherein said second head comprises an elastic washer and wherein said shaft further includes a rollover flare for urging said washer against said strap portions and for imparting sufficient elastic deformation into said elastic washer to maintain said strap portions under compression over reducing combined thickness of said strap portions.

A fastener for use in a peening flap of the type comprising a strap with a peening means affixed thereto and including at least first and second strap portions fastened together, said fastener comprising:

• a shaft including a first end and a second end;
• a first head adjacent said first end;
• and
• a second head adjacent said second end,
• wherein said first and second strap portions have a combined thickness and are secured between said first and second heads;
• wherein said second head includes elastic compression means for maintaining compression on said strap portions, said elastic compression means having sufficient elasticity to maintain compression on said strap portions with reducing combined thickness.

A fastener for use in a peening flap of the type comprising a strap with a peening means affixed thereto and having at least a first and second strap portion fastened together, said fastener comprising:

• a shaft including a first end and a second end;
• a first head adjacent said first end;
• and
• a washer adjacent said second end;
• wherein said second end further comprises a rollover flare to urge said washer against strap portions fastened between said first head and said washer;
• wherein said washer is sufficiently elastic to maintain compression on strap portions fastened between said first and second heads over reducing combined thickness of the strap portions;
• and
• wherein:
• the ratio of the outer diameter of said washer to the outer diameter of said rollover flare is between 1.1:1 and 5:1;
• the modulus of elasticity of said washer is between 10,000 and 600,000 psi;
• the ratio of the outer diameter of said first head to the outer diameter of said washer is between 3:1 and 0.5:1;
• and
• the ratio of the outer diameter of said washer to the diameter of said shaft is between 1.1:1 and 5:1.

A rotary peening wheel comprising:

• a hub;
• and
• at least one peening flap fastened to said hub;
• wherein said peening flap includes:
• a strap including a first strap portion, a second strap portion, a first aperture formed in said first portion and a second aperture formed in said second portion;
• peening means mounted on said strap;
• and
• a fastener for securing said first and second strap portions together under compression, said fastener including:
• a shaft extending through said apertures, said shaft including a first end and a second end;
• and
• a first head adjoining said first end and a second head adjoining said second end;
• wherein said first and second strap portions have a combined thickness and are secured between said first and second heads;
• and
• wherein said second head includes elastic compression means for maintaining compression on said strap portions, said elastic compression means having sufficient elasticity to maintain compression on said strap portions with reducing combined thickness.