Title:
SELF-PROGRESSING SCREW
Document Type and Number:
Japanese Patent JP2001323911
Kind Code:
A
Abstract:
To securely sink a head of a screw into an ALC plate with a small force.
Plural ribs 7 respectively provided with a cutting blade 8 along the circumferential direction with an appropriate space are provided on a tapered seat surface of a head 4. The cutting blade 8 of the rib 7 is extended in the tangent direction of a shaft 2 with a view from a bottom surface, and formed to be higher from a part close to the shaft 2 toward the peripheral surface of the head 4. The head 4 is formed with arc-like cutouts 10 in a plane view at a position of each rib 7, and the cutting blade 8 is extended to an edge 10a of the cutouts 10. Opening dimension L2 of the one cutout 10 is formed larger than the space dimension L3 between the adjacent cutouts 10.
Inventors:
SAWADA TADASHI
NAGATA SHIGEO
NAGATA SHIGEO
Application Number:
JP2000140492A
Publication Date:
November 22, 2001
Filing Date:
May 12, 2000
Export Citation:
Assignee:
JAPAN POWER FASTENING CO LTD
International Classes:
F16B25/10; F16B25/00; F16B25/04; (IPC1-7): F16B25/10; F16B25/00; F16B25/04
Domestic Patent References:
| JPS59131013A | 1984-07-27 | |||
| JP657900S | ||||
| JP1006233S |
Attorney, Agent or Firm:
Akio Ishii (2 outside)