JPS6420515U

JPS6420515U -

Info

Publication number: JPS6420515U
Application number: JP11527487U
Authority: JP
Priority date: 1987-07-28
Filing date: 1987-07-28
Publication date: 1989-02-01

Description

[Brief explanation of the drawing]

図面は本考案の実施例に係わり、第１図はドリ
ルねじの正面図、第２図は同要部の側面図、第３
図は同要部の拡大斜視図であり、第４図は同要部
の底面図、第５図は第１図のＡ−Ａ線に沿う端面
図である。１…ドリルねじ、２…シヤンク部、３…頭部、
４…ドリル部、５…凹部、６…ねじ山、７…縦溝
、８…傾斜端面、９…第１溝面、１０…第２溝面
、１１…切削面、１２…すくい溝、１３…ランド
、１４…チゼルエツジ、１５…基準面、１６，１
７…切刃、Ｄ…長手軸線、θ…すくい角。 The drawings relate to an embodiment of the present invention, and Fig. 1 is a front view of the drill screw, Fig. 2 is a side view of the main parts, and Fig. 3 is a front view of the drill screw.
The figures are enlarged perspective views of the main parts, FIG. 4 is a bottom view of the main parts, and FIG. 5 is an end view taken along line A--A in FIG. 1. 1... Drill screw, 2... Shank part, 3... Head,
4... Drill part, 5... Recessed part, 6... Thread, 7... Vertical groove, 8... Inclined end surface, 9... First groove surface, 10... Second groove surface, 11... Cutting surface, 12... Rake groove, 13... Land, 14...Chisel edge, 15...Reference surface, 16,1
7...Cutting edge, D...Longitudinal axis, θ...Rake angle.

Claims

[Scope of utility model registration request]

a shank portion having a thread formed on its outer periphery; a head portion having a rotational engagement means integrally provided at the upper end of the shank portion; and a head portion formed by forging at the lower end portion of the shank portion; and a drill part having two longitudinal grooves located opposite to each other and extending obliquely in the axial direction, the cutting surfaces formed by the longitudinal grooves being opposite to each other with respect to the longitudinal axis. By forming the cutting surface and the cutting edges formed at the front edge and the side edge of the cutting surface into a concave shape with respect to the longitudinal groove surface,
A drill screw characterized in that a rake angle is formed on the both edges, and further a rake groove is formed from the tip of the drill part to the base end of the drill part and along the line of intersection of the longitudinal groove and the side wall surface of the land part. .