Title:
周方向スロット形状の凹みを具えたねじ及びそのための駆動工具
Document Type and Number:
Japanese Patent JP3549917
Kind Code:
B2
Abstract:
The fastener head recess has a pair of radial slots (16, 18) formed in the head (12), a ledge (20) in each recess being located a short distance axially below the head surface (13) and extending a predetermined angular length from the axial portion of the ledge (20). The dimension of the ledge (20) is adjustable to accommodate the strength of fastener material in a manner such that the displacement formation of recess material on the surface (13) of the fastener head (12) is prevented during normal installation procedures. The drive angle on the recess is designed to be zero degrees.
Inventors:
Frank Jay Cosenza
Application Number:
JP5258494A
Publication Date:
August 04, 2004
Filing Date:
February 28, 1994
Export Citation:
Assignee:
Hack Patents, Incorporated
International Classes:
B25B13/06; B25B15/00; B25B13/54; F16B23/00; (IPC1-7): F16B23/00; B25B13/54
Domestic Patent References:
| JP60238275A |
Attorney, Agent or Firm:
Takashi Ishida
Jun Tsuruta
Masaya Nishiyama
Higuchi Souji
Jun Tsuruta
Masaya Nishiyama
Higuchi Souji