Title:
DRILL SCREW
Document Type and Number:
Japanese Patent JP2019178721
Kind Code:
A
Abstract:
To provide a drill screw which can cause a head part to sink and can prevent burr from occurring.SOLUTION: A drill screw 10 includes a shaft part 12 having a screw part 14, a head part 16 having a diameter larger than an outer diameter of the screw part 14, a neck part 22 which is connected to the shaft part 12 and the head part 16 and has a tapered part and an annular protrusion edge part 30 which is arranged from an outer periphery of the head part 16 to a radial direction inner side of the head part 16 and is connected to the neck part 22. Therein, the annular protrusion edge part 30 includes a first protrusion piece 32 which is substantially parallel to axial direction of the shaft direction 12 and is protruded toward a screwing direction of the drill screw 10, from a base end part 30A of the protrusion edge part 30 and a second protrusion piece 34 which is substantially parallel to an axial direction of a shaft direction 12 and is protruded toward a direction opposite to a screwing direction of the drill screw 10, from a base end part 30A of the protrusion edge part 30, and a pressing surface part 30is formed on an outer circumferential part of the head part 16 by the first protrusion piece 32, the second protrusion piece 34 and the base end part 30A of the protrusion edge part.SELECTED DRAWING: Figure 3
Inventors:
SHUYAMA TOKIHIRO
Application Number:
JP2018067519A
Publication Date:
October 17, 2019
Filing Date:
March 30, 2018
Export Citation:
Assignee:
KAMIYAMA TEKKOSHO KK
International Classes:
F16B25/00; F16B25/10
Domestic Patent References:
| JP2002257122A | 2002-09-11 | |||
| JPS5614416Y2 | 1981-04-04 | |||
| JP2015010665A | 2015-01-19 | |||
| JP2014231888A | 2014-12-11 | |||
| JP2002031115A | 2002-01-31 |
Attorney, Agent or Firm:
Masahiro Okada