Claims
- 1. A fastener having an elongate shank defining an axis, the fastener having an enlarged head formed at one end of the shank, the shank having a grooved portion formed with helical grooves defining helical ribs and a cylindrical portion between the grooved portion and the tip, the helical grooves having rounded crests, the grooved and cylindrical portions defining an imaginary cylinder having a constant diameter along the grooved and cylindrical portions, wherein the grooved portion is formed with annular grooves defining annular rings.
- 2. The fastener of claim 1 wherein the helical grooves are deeper than the annular grooves.
Parent Case Info
This application is a continuation of application Ser. No. 08/293,003 filed Aug. 14, 1994, now U.S. Pat. No. 5,489,179.
US Referenced Citations (32)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2038885 |
Feb 1972 |
DEX |
57-35693 |
Apr 1979 |
JPX |
823461 |
Nov 1959 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
293003 |
Aug 1994 |
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