GB2381488A

GB2381488A - Threading tool

Info

Publication number: GB2381488A
Application number: GB0126324A
Authority: GB
Inventors: Tzung Yen Wu
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-11-02
Filing date: 2001-11-02
Publication date: 2003-05-07
Also published as: GB0126324D0

Abstract

A multi-step threading tool chaser 1 comprising two non-continuous thread cutting units (11, 12, 13). The tapered cutting units are frustro-conically shaped, and the diameter of the flat piece 14 increases from cutting unit 11 to 12 to 13. Each cutting unit may have a drain groove 15, by which iron dust may be drained. The thread cutting tap is more durable.

Description

Title of the Invention: Multistep threading tool chaser Background of the Invention 1. Field of the Invention The invention relates to a multistep threading tool chaser, more particularly to a multistep threading tool chaser which easy for thread cutting and increased indurability, as well as raise the quality of a thread of a nut and increased in productivity.

2. Description of the Related Art The conventional threading tool chaser 2 for the inner thread of nut shaping, as shown in Figure 1 and Figure 2, consists of a thread cutting unit 21, and a drain groove 22 which next the thread cutting unit 21. The thread cutting unit 21 needs to be widened backward gradually and become tapper, which would advantage the thread cutting to nominal dimension. Whereas, the conventional threading tool chaser 2 as a consequence of defects of design, which leads to the following defects: (1) As a result of the threading cutting unit 21 is continual structure, which produces the iron dust from inner thread cutting. These iron dust are curly bending and stay in the drain groove

22-As a reslut of these iron dust don't breakable and there're resistace, particularly to cutting more deep inner thread which brings to the threading tool chaser break off. These iron dust are inserted in the inner thread and not easy to take off. If the thread tool chaser don't break off, as a result of the thread tool chaser must conquer great resitstance bring to the durability of the thread tool chaser is very easy to be reduced. As a whole, as a result of the conventional threading tool chaser 2 can't conquer cutting resistance which brings to decreased the productivity and increased in cost of production.

(2) Duing to to the thread cutting unit 21 needs to be widened backward gradually and become tapper, Which brings about at the ends of the thread cutting unit 21 become the nominal dimension of inner thread. Owing to the nominal dimension of inner thread not to be amended which leads to the inner thread hasn't enough strength. For reasons already stated, the inner thread is very easy to deform and decreased the power of union when the inner thread is screwed with the outer thread. On the other hand, It is difficult for the outer thread to reversed backward from the inner thread. Hence, Owing to

the outer thread not to be amended which have an effect on quality of nut.

Therefore, in order to improve the above - mentioned defects of the conventional device, to create a more efficient thread tool chaser, and to help solve the common problems for the industrial field, this inventor with many years of experience in this field has actively and constantly performed experiments and overcome many difficulties, thus able to provide improved multistep threading tool chaser.

Brief Summary of the Invention Therefore, the main objective of the present invention is to provide a multistep threading tool chaser which easy for thread cutting and increasing durability, as well as raise the quality of a thread of a nut and increasing in productivity.

Brief Description of the Drawings Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments, with reference to the accompanying drawings, of which : Figure 1 is a block schematic diagram of the conventional threading tool chaser; Figure 2 is an elevational view of the

conventional threading tool chaser; Figure 3 is a block schematic diagram of the multistep threading tool chaser of the present invention ; Figure 4 in an elevational view of the mult. i ntcp threading tool chaser of the present invention; Figure 5 is a perspective view of the multistep threading tool chaser of the present invention.

Detailed Description of the Invention First of all, Referrig to Figures 1, and 2 and 3, the preferred embodiment of a multistep threading tool chaser 1 of the present invention comprises a series of thread cutting unit 11,12

and 13. The above-mentioned thread cutting unit 11, 12 and 13 haven'tcontiual each other and each front end of diameter are all one. Owing to a series of thread cutting unit 11,12 and 13 all to be widened backward gradually, As a result of the separate guideangel a, ss, r of thread cutting unit 11,12, 13 are all widened backward gradually (a < ss < 'y). The front end of diameter D of these thread cutting unit 11,12, 13 are all one. The end of each thread cutting unit 11, 12, 13 has a straightway 14, By means of straightway 14 can cause the separate end diameter E, F, G of these thread cutting unit 11,12, 13 become E < F < G, and each thread cutting unit 11,12, 13

have the drain groove 15 hich similar to prior art.

These drain groove 15 are next to each other, which easy for iron dust to be drained.

While the preferred emvodiment of a multistep threading tool chaser 1 of the present invention uses in inner thread cutting, for example three - step threading tool chaser. while carry into effect inner thread cutting of M8P1-25 (bore diameter is 8mm and pitch is 1. 25mm), bore diameter of nut is 6. 8mm, outer diameter of threading tool chaser is 8mm, amount of thread cutting is 1. 2mm, amount of thread cutting separately is 35%, 35%, 30%.

Hence, the first-step thread cutting is 7. 3mm, second-step thread cutting is 7. 7mm, third-step thread cutting is 8. Omm.

For example, while make the above-mentioned thread of bore diameter is 8mm and pitch is 1. 25mm, which carry on two step thread cutting, the amout of thread cutting separately are 55% and 45%, hence first-step thread cutting is 7.5mm, second-step thread cutting is 8. 0mm.

While by means of multistep threading tool chaser 1 of each step to cutting inner thread, all by means of the straight 14 to amend and clear. Hence, the strength of the thread of

thread cutting carry into effect the treatment of homogeneity, which caused the strength reinforced of inner thread and the surface of inner thread is clear-cut. By means of the above-mentioned treatment which caused the power of union reinforced while the inner screw is screwed with the outer thread, and will be very easy for the inner thread and outler thread to carry into effect screw tighten and screw lossen, to raise the quality of the inner thread.

More particularly to the preferred embodiment of a multistep treading tool chaser 1 of the present invention comprises two-step and don't continual thread cutting which makes thread.

Hence, the retain iron dust from thread cutting is very easy to break off and drain out, and to reduce the resistance of thread cutting, to reinforced the durability of multistep threading tool chaser 1 (approximated three times than conventional threading tool chaser). At the same time, the multistep threading tool chaser 1 is not easy to break off. hence, increased in conductivity of nut and reduced the cost of production.

To sum up, this invention really can achieve the desired purposes and effects of application,

and it is more useful than the conventional device. Jn addition, there is no similar article with the same characteristics prior to th. is invention ; therefore, it meets the requirements for application for invention patent. The application is hereby submitted, in the hope that you can grant the patent.

While the present invention has been described in connection with what is considered the most practical and preferred embodiments, it is understood that his invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements-

Claims

CLAIM: 1. A multistep threading tool chaser, comprising two don't continual thread cutting units, the guideangel of each step thread cutting unit is widened backward gradually, and the end of each step thread cutting unit has a straightway, by means of the straightway caused the diameter of each step thread cutting unit is widened backward gradually.