CN2386242Y

CN2386242Y - Improved structure of drilling tail screw

Info

Publication number: CN2386242Y
Application number: CN 99227721
Authority: CN
Inventors: 庄振基
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-02
Filing date: 1999-07-02
Publication date: 2000-07-05
Anticipated expiration: 2009-07-02

Abstract

The utility model relates to an improved structure of a drilling tail screw which is suitable for various drilling tail screws. The utility model is characterized in that an inner concave gap for setting an included angle is arranged at a dead center position which is arranged at the front part of a screw and the front end of a drilling tail, and the inner concave gap divides the dead center at the front end of a drilling tail into two dead centers. The drilling tail screw has the advantages of excellent polarization, excellent stability, and fast tapping benefit generated by the dead center at the front end of the drilling tail.

Description

The improvement structure of SELF DRILLING SCREWS

The utility model relates to a kind of improvement structure of screw, specifically, is a kind of improvement structure of SELF DRILLING SCREWS.

As everyone knows, the material that the design of screw is established object according to different spiral shells is different and different, but the brill tail is set for the SELF DRILLING SCREWS that produces the self tapping benefit for various screw front end, to the greatest extent be misplaced face except the design indent and be misplaced and face nearly brill tail leading edge both sides and constitute the cutting lip in the front end both sides of boring tail in traditional SELF DRILLING SCREWS in each indent, other has other improvement design, the cutting lip place of utilization edge in face of tommy bar tail both sides indent is misplaced, make out the sword that colludes, to reach the raising of boring, chip removal function with setting angle of inclination projection.

Yet, learn in the document of conventional screw design formerly, various SELF DRILLING SCREWS is all made every effort in the improvement of holing, spiral shell advances effect, but for the SELF DRILLING SCREWS single dead point design of front end to the greatest extent, Yi Yin bores the blunt file of tail front end dead point, cause the deficiency of creeping into the bad of polarization and stability, and produce to bore effort in askew and the drilling process, time-consuming situation, then study and improvement.

Therefore, the purpose of this utility model is the shortcoming that overcomes prior art, a kind of improvement structure of SELF DRILLING SCREWS is provided so that SELF DRILLING SCREWS to the greatest extent the front end dead point have excellent polarization and stability, and use the front end dead point up and have the effect that rapid fixed point stirring hole creeps into.

The utility model is to realize like this, it comprises SELF DRILLING SCREWS, characteristics are that the brill tail of this SELF DRILLING SCREWS is provided with concane gap at least one in the front end tip to the greatest extent, the angle, opening two ends of concane gap and the cutting lip place of continuing just constitute at least two dead points that bore the most front end of tail in being somebody's turn to do, wherein, this tommy bar tail is the set interior concane gap of front end to the greatest extent, is the V-notch that can be indent.

Positive progressive effect of the present utility model is:

1, screw front end brill tail has better polarization and stability when boring.

2, owing to having better polarization and stability, so the accuracy height of boring.

3, since the brill tail of screw to the greatest extent front end have at least two pointed dead points, so during boring, bore tail front end dead point place and have excellent stirring hole and creep into usefulness, make the spiral shell of screw attack more relaxed, quicker.

Accompanying drawing of the present utility model is simply described as follows:

Fig. 1 is the utility model embodiment's a structural representation.

Fig. 2 is the right elevation (left view is identical) of Fig. 1.

Fig. 3 is another embodiment's of the utility model a structural representation.

Fig. 4 is the right elevation (left view is identical) of Fig. 3.

Fig. 5 is the another embodiment's of the utility model a structural representation.

Fig. 6 is the utility model structural representation of an embodiment again.

The number in the figure explanation:

1-screw 2-brill tail 3-indent is misplaced face

4-cutting lip, 5-dead point, 6-breach

Provide embodiment of the present utility model according to Fig. 1～Fig. 6 below, but cited embodiment just is used for illustrating the utility model, rather than is used for limiting the utility model, such as various SELF DRILLING SCREWS is used creation characteristic of the present utility model, all should belong to the category of right of the present utility model.

See also Figure 1 and Figure 2, they illustrate an embodiment of the present utility model, the front-end edge both sides that are misplaced face 3 in screw 1 front end brill tail 2 both sides indents are cutting lips 4, brill tail 2 in 4 handing-over of both sides cutting lip is provided with the interior concane gap 6 that at least one sets angle in the front end tip to the greatest extent, this breach 6 can be the V-notch of indent, and continuous cutting lip 4 places of boring tail 2 of the opening two ends corner connection of interior concane gap 6 just constitute at least two pointed dead points 5.

Please consult Fig. 3 and shown in Figure 4 again, they are another embodiments of the present utility model, wherein this screw 1 front end brill tail 2 is tabular brill tail, be respectively equipped with set angle and protrude in the cutting lip 4 that indent is misplaced face 3 boring front-end edge that tail 2 both sides indents are misplaced face 3, this cutting lip 4 is tied to form a set angle and tilts outstanding, and each side indent is misplaced the angle of face 3 surface and 4 one-tenth one non-flat shapes of each cutting lip, brill tail 2 in this tabular SELF DRILLING SCREWS 1 is provided with the interior concane gap 6 that at least one sets angle in the front end tip to the greatest extent, this breach 6 is to can be the indent V-notch, in continuous cutting lip 4 places of boring tail 2 of the opening two ends corner connection of interior concane gap 16, just constitute at least two pointed dead points 5.

See also shown in Figure 5, it is another embodiment of the present utility model, wherein this screw 1 front end bores tail 2 and is provided with the interior concane gap 6 that at least one sets angle in the tip of front end to the greatest extent, this breach 6 is an indent V-notch, continuous cutting lip 4 places of boring tail 2 of the opening two ends corner connection of concane gap 6 just constitute at least two pointed dead points 5 in this.

See also shown in Figure 6, it is an embodiment more of the present utility model, this screw 1 front end bores tail 2 and is provided with the interior concane gap 6 that at least one sets angle in the tip of front end to the greatest extent, this breach 6 is an indent V-notch, continuous cutting lip 4 places of boring tail 2 of the opening two ends corner connection of concane gap 6 just constitute at least two pointed dead points 5 in this.

From the above mentioned, the utility model principal character is: the brill tail of Self Drilling Screws to the greatest extent front end has At least two pointed dead points.

Claims

1, a kind of improvement structure of SELF DRILLING SCREWS, comprise SELF DRILLING SCREWS, the brill tail that it is characterized in that this SELF DRILLING SCREWS is provided with concane gap at least one in the front end tip to the greatest extent, and proper formation in angle, opening two ends of concane gap and the cutting lip place of continuing is bored tail at least two dead points of front end to the greatest extent in this.

2, the improvement structure of SELF DRILLING SCREWS according to claim 1 is characterized in that the said tommy bar tail set interior concane gap of front end to the greatest extent, is the V-notch that can be indent.