JPS622819U

JPS622819U -

Info

Publication number: JPS622819U
Application number: JP9303685U
Authority: JP
Priority date: 1985-06-21
Filing date: 1985-06-21
Publication date: 1987-01-09
Also published as: JPH0135054Y2

Description

[Brief explanation of the drawing]

第１図は、この考案の一実施例セルフタツピン
グねじの側面図、第２図は、第１図のセルフタツ
ピングねじの一部破断拡大斜視図、第３図は、第
２図の―線による一部破断断面図、第４図は
、この考案の他の実施例の第２図と同様の断面図
、第５図は、この考案のさらに別の実施例の第２
図と同様の断面図、第６図は、従来のセルフタツ
ピングねじの使用状態を示す一部破断分解断面図
である。〔符号の説明〕１……セルフタツピングねじ、
２……頭部、３……軸部、７……ねじ部、８……
第１フランク部、９……第２フランク部、２２…
…下穴、２５……セルフタツピングねじ、２６…
…ボス。 Fig. 1 is a side view of a self-tapping screw according to an embodiment of the invention, Fig. 2 is a partially cutaway enlarged perspective view of the self-tapping screw of Fig. 1, and Fig. 3 is a side view of the self-tapping screw of Fig. 2. 4 is a sectional view similar to FIG. 2 of another embodiment of this invention, and FIG. 5 is a sectional view of still another embodiment of this invention.
FIG. 6, which is a sectional view similar to the figure, is a partially broken exploded sectional view showing a conventional self-tapping screw in use. [Explanation of symbols] 1...Self-tapping screw,
2...Head, 3...Shaft, 7...Threaded part, 8...
First flank portion, 9...Second flank portion, 22...
...Prepared hole, 25...Self-tapping screw, 26...
…boss.

Claims

[Scope of Claim for Utility Model Registration] 1. A self-tapping screw having a head and a shaft continuous to the head, the shaft having a threaded part, the threaded part having an outer diameter equal to the nominal diameter. a plurality of first flank portions each having a diameter and having a thread angle set at an arbitrary angle in the range of 45° to 55°;
A second flank part is provided between the flank parts, the second flank part being arranged continuously to the first flank part and having a radial cross-sectional area smaller than that of the first flank part, The length of the second flank in the direction of one thread is 12 times the length of one lead of the thread.
A self-tapping screw set as follows, characterized in that the second flank portion is provided at at least two locations for one lead of the screw. 2 Adjust the thread angle of the second flank part to the first
The radius of the second flank is set to be the same as the thread angle of the flank, and the height of the second flank from the shaft is set lower than the height of the first flank from the shaft. 2. The self-tapping screw according to claim 1, wherein the cross-sectional area in the radial direction is smaller than the cross-sectional area in the radial direction of the first flank portion. 3 While setting the height of the second flank part from the shaft part to be the same as the height from the shaft part of the first flank part, the thread angle of the second flank part is set to the thread angle of the first flank part. The angle is set smaller by a value in the range of 2° to 5°, and the radial cross-sectional area of the second flank portion is formed smaller than the radial cross-sectional area of the first flank portion. Self-tapping screws according to item 1. 4 While setting the length of the base of the thread of the second flank part to be the same as the length of the base of the thread of the first flank part, the thread angle of the second flank part is set to be the same as the length of the base of the thread of the first flank part. 2° to 5 from the thread angle
According to claim 1, the radial cross-sectional area of the second flank portion is made smaller than the radial cross-sectional area of the first flank portion. Self-tapping screws as described.