Title:
薄い被加工物を結合させるためのセルフタッピングねじ、ブランク、方法、及びそれらを作成するためのダイ及び方法
Document Type and Number:
Japanese Patent JP4480395
Kind Code:
B2
Abstract:
A headed multi-lobed blank, method of manufacturing a self-tapping screw from the blank, and resulting multi-lobed self-tapping screw for joining thin workpieces provides desirable thread-forming characteristics at the conical tip and body portions, and improved resistance to vibrational loosening near the head. The resulting screw, obtained from the blank and method, incorporates a threaded tapered root portion between the screw head and body portion having a cross section that varies from nearly circular in the area adjacent to the underside of the head to a maximum out-of-round (or lobular) cross section at the intersection of the tapered root portion and the screw body. This shape, to combined with a thread profile outer diameter that remains largely constant from the body portion through the tapered root portion, and a multiple coil (lead thread) shape, ensure more secure holding of the screw in a thin anchor material-with the anchor material extruded axially forward and backward around the root portion.
Inventors:
Alain Prichart
Boyer, Dennis, Oh
Boyer, Dennis, Oh
Application Number:
JP2003527277A
Publication Date:
June 16, 2010
Filing Date:
August 09, 2002
Export Citation:
Assignee:
Conti Fasteners Akchen Gezel Shaft
International Classes:
F16B25/02; F16B25/06; B21H3/02; B21H3/06; F16B25/00; F16B35/00; F16B35/04
Domestic Patent References:
| JP2000291614A | ||||
| JP11247817A | ||||
| JP61157715U | ||||
| JP4092107A |
Foreign References:
| US5356253 | ||||
| US5518352 |
Attorney, Agent or Firm:
Satoshi Furuya
Takahiko Mizobe
Kiyoharu Nishiyama
Takahiko Mizobe
Kiyoharu Nishiyama