Title:
SCREW
Document Type and Number:
Japanese Patent JP2022129033
Kind Code:
A
Abstract:
To provide a screw suitable for a covering method for suppressing the occurrence of come-out that a bit comes off from the screw even if a rotational load is high.SOLUTION: A screw 1A comprises a head part 3 at which a recess 2A fit with a driver bit is formed, and a shaft part 4 at which a screw thread 40 is formed. The recess 2A has six pieces of apexes 20A in a peripheral direction of the head part, the apexes 20A are constituted of curve lines which become protrusive toward an external periphery of the head part 3, and a clearance between the apexes 20A is constituted of a curve line which becomes protrusive toward a center of the head part 3, and has an inside face 21A which is parallel to an axial direction of the shaft part 4. In the screw 1A, a thickness of the head part 3 is 1.2 mm or thicker and 2.4 mm or thinner, a depth of the recess 2A is 1.6 mm or deeper, and a wall thickness of a periphery of the recess 2A is 0.7 mm or thicker.SELECTED DRAWING: Figure 1B
Inventors:
HAYASHI SUSUMU
KUBO KOJI
ARAI TOSHIMICHI
KUBO KOJI
ARAI TOSHIMICHI
Application Number:
JP2021027562A
Publication Date:
September 05, 2022
Filing Date:
February 24, 2021
Export Citation:
Assignee:
MAX CO LTD
International Classes:
F16B23/00; E04D3/36; F16B15/08; F16B33/06
Attorney, Agent or Firm:
Gwangyang International Patent Office
Yamaguchi International Patent Office
Yamaguchi International Patent Office