JPS6067821U

JPS6067821U - screw tap

Info

Publication number: JPS6067821U
Application number: JP16026283U
Authority: JP
Inventors: 斉藤　康英
Original assignee: Individual
Current assignee: Individual
Priority date: 1983-10-17
Filing date: 1983-10-17
Publication date: 1985-05-14

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

図はこの考案の実施例を示し、第１図はねじタップの全
体側面図、第２図は第１図のｎ＝ｎ線矢視図親図３図は
第１図の■−■線矢視図親図４図は第１図の部分断面拡
大図である。１・・・・・・ねじタップ、６・・・・・・切削面、６
ａ・・・・・・縁部、８・・・・・・最終形状のめねじ
、８ａ・・・・・・山部、８ｂ・・・・・・谷部、９・
・・・・・小径めねじ、９ａ・・・・・・谷部。The figures show an embodiment of this invention, and Fig. 1 is an overall side view of the screw tap, Fig. 2 is a main view taken from the n=n line in Fig. 1, and Fig. 3 is a main view taken from the 4 is an enlarged partial sectional view of FIG. 1. 1... Thread tap, 6... Cutting surface, 6
a...Edge, 8...Final shape female thread, 8a...Mountain, 8b...Trough, 9.
...Small diameter female thread, 9a...trough.

Claims

[Scope of utility model registration request]

A tap for cutting and forming a small-diameter female thread with a smaller root diameter than the female thread as a step before cutting and forming the final-shaped female thread, the cutting surface for cutting the small-diameter female thread being in the axial direction of this tap. The shape of the valley between these adjacent cut surfaces is such that the crest of the final female thread is cut and formed, and the edge of the cut surface that forms the valley of the small diameter female thread is A screw tap characterized in that the tap has a trapezoidal shape projecting outward in the radial direction, and corners at both ends of the top of the trapezoid are chamfered into arc shapes.