Title:
WOOD SCREW
Document Type and Number:
Japanese Patent JP2016114178
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a wood screw for use in screwing into a light weight soft wood such as cedar material in which a screwing-in torque is reduced and a pulling-out holding power is improved.SOLUTION: This invention relates to a wood screw in which a shank part is extended from a head part including an engagement part for a rotary tool and a screw thread is formed from a sharp end part of a shank extremity end toward the head part and this screw is screwed into a light weight soft wood such as cedar material. In regard to a pitch P of the screw thread, a groove bottom width W of the screw thread groove formed between the adjoining screw threads, an approaching side flank angle θ1 of the screw thread and a retraction side flank angle θ2, a value of W/P is set to have a range of equal to or more than 0.6 and equal to or less than 0.7, a value of θ1+θ2 is set to have a range of equal to or more than 25° and equal to or less than 40° and a relation of θ1>θ2 is set.SELECTED DRAWING: Figure 2
Inventors:
YAJIMA TAKASHI
HIBI GENKI
HIBI GENKI
Application Number:
JP2014253993A
Publication Date:
June 23, 2016
Filing Date:
December 16, 2014
Export Citation:
Assignee:
MARUEMU SEISAKUSHO:KK
International Classes:
F16B25/04; F16B33/02
Domestic Patent References:
| JPS4848857A | 1973-07-10 | |||
| JPH05280519A | 1993-10-26 |
Attorney, Agent or Firm:
Osamu Nakano