CN201265581Y

CN201265581Y - Self-drilling screw

Info

Publication number: CN201265581Y
Application number: CNU200820129371XU
Authority: CN
Inventors: 陈丽霞
Original assignee: SUN THROUGH INDUSTRIAL Co Ltd
Current assignee: SUN THROUGH INDUSTRIAL Co Ltd; SUN THROUGH Ind Co Ltd
Priority date: 2008-08-07
Filing date: 2008-08-07
Publication date: 2009-07-01
Anticipated expiration: 2018-08-07

Abstract

The utility model relates to a self-drilling screw which comprises a head, a rod part, a thread part, a cutting part and a pair of wing panels, wherein the rod part is fixedly connected with one side of the head along an axial line, the thread part is arranged on the outer peripheral surface of the rod part around the axial line, the cutting part arranged on the tail end of the rod part is positioned on one side of the thread part, and the pair of wing panels approaches to the tail end of the cutting part; the cutting part is provided with a cutting lip arranged on the tail end and two cutting surfaces, the wing panels are provided with bottom edges and top edges, the distance between the bottom edges of the wing panels and an extending conical surface extending from the cutting lip outwards is smaller than the distance between the top edge and the top end of the cutting part, and thereby the wing panels approach to the cutting lip, are not easy to clamp and achieve the smooth chip discharging purpose.

Description

SELF DRILLING SCREWS

Technical field

The utility model relates to a kind of screw lock element, particularly relates to a kind of SELF DRILLING SCREWS.

Background technique

As shown in Figure 1, existing a kind of SELF DRILLING SCREWS, comprise bar portion 2 that a head 1, one be fixed in these head 1 one sides, spiro tooth part that is arranged on these bar portion 2 outer circumferential faces 3, a cutting portion 4 and an a pair of fin 5 that is arranged on 4 of this spiro tooth part 3 and this cutting portions that is arranged on these bar portion 2 terminal parts and is positioned at these spiro tooth part 3 one sides, this cutting portion 4 have the drill lip portion 401 that is located at end and has a cone angle and a pair of by this drill lip portion 401 towards cutting face 402 that this spiro tooth part 3 extends.And SELF DRILLING SCREWS mainly is to utilize drill lip portion 401 in regular turn a slice plank and a slice steel plate to be holed, make this spiro tooth part 3 directly be engaged in this steel plate again, and reach screw locking purpose, the function of described fin 5 is when 4 pairs of plank borings of this cutting portion, has the effect of getting rid of wood chip, and desired screw lock before this steel plate at this spiro tooth part 3, fin 5 will be subjected to the effect of steel plate and be fractureed.

Though this SELF DRILLING SCREWS can reach the application target of expection, when operation, can produce following problem:

1. because fin 5 is away from this drill lip portion 401, so that when the plank hardness that this SELF DRILLING SCREWS was drilled with was hard, fin 5 was stuck in plank easily, even fractures ahead of time, so that row cuts poor effect.

2. also because fin 5 is away from this drill lip portion 401,, cause the tapping failure easily so that the metal fillings that 401 pairs of steel plate drillings of drill lip portion are produced can't be excluded smoothly.

The model utility content

The purpose of this utility model is to provide a kind of chip removal effect good and guarantee tapping SELF DRILLING SCREWS smoothly

SELF DRILLING SCREWS of the present utility model, comprise a head, a bar portion that is fixed in this head one side along an axis, a spiro tooth part that centers on this axis and be arranged on this bar portion outer circumferential face, a cutting portion and an a pair of fin that levels off to this cutting portion end that is arranged on this bar portion terminal part and is positioned at this spiro tooth part one side, this cutting portion have one be located at end and have the drill lip portion of a cone angle and two by this drill lip portion towards cutting face that this spiro tooth part extends, and this drill lip portion by middle apex towards the periphery direction extension conical surface that extends outwardly out, described fin respectively has one to the root edge that should drill lip portion and the apical margin of an opposite setting with this root edge, the root edge of described fin and this extend the distance of the conical surface, less than the distance between apical margin and this cutting portion top.

The beneficial effects of the utility model are: utilize the position of fin setting to level off to this drill lip portion, and make the distance of root edge and this extension conical surface of fin, less than the distance between apical margin and this cutting portion top, it is good and tapping is smooth to guarantee that then row cuts effect.

Description of drawings

Fig. 1 is the planimetric map of existing a kind of SELF DRILLING SCREWS;

Fig. 2 is the planimetric map of first preferred embodiment of the utility model;

Fig. 3 is the local enlarged diagram of the above-mentioned preferred embodiment of the utility model;

Fig. 4 is the operation chart of the above-mentioned preferred embodiment of the utility model, illustrates that a SELF DRILLING SCREWS is in regular turn to the boring of a slice plank and to a slice steel plate self tapping screw lock;

Fig. 5 is the local enlarged diagram of second preferred embodiment of the utility model;

Fig. 6 is the local enlarged diagram of the 3rd preferred embodiment of the utility model;

Fig. 7 is the local enlarged diagram of the 4th preferred embodiment of the utility model.

Embodiment

Below in conjunction with drawings and Examples the utility model is elaborated:

As shown in Figures 2 and 3, first preferred embodiment of the utility model SELF DRILLING SCREWS 10 comprises a head 11, one be fixed in these head 11 1 sides along an axis L bar portion 12, one and is arranged on these bar portion 12 terminal parts and is positioned at the cutting portion 14 and a pair of fin 15 that levels off to these cutting portion 14 ends of these spiro tooth part 13 1 sides around this axis L and the spiro tooth part 13, that are arranged on these bar portion 12 outer circumferential faces.

This cutting portion 14 have one be located at end and have the drill lip portion 141 of a cone angle and two by this drill lip portion 141 towards the cutting face 142 that this spiro tooth part 13 extends, and this drill lip portion 141 by middle apex towards the periphery direction extension conical surface 143 that extends outwardly out.

Described fin 15 respectively has a reinforced ribs 153 that the apical margin 152 of root edge 151 that should drill lip portion 141, and these root edge 151 opposite settings and is arranged on 152 of this root edge 151 and this apical margins.The root edge 151 of present embodiment takes the form of inclined plane, and produces an angle with this axis L.The root edge 151 of described fin 15 extends the distance of the conical surface 143 with this, and less than the distance between apical margin 152 and this cutting portion 142 tops, fin 15 root edges 151 of present embodiment extend the conical surface 143 suitable convergences with this.

By this, again as shown in Figure 4, when 14 pairs of a slice planks of cutting portion 100 of SELF DRILLING SCREWS 10 are holed, utilize fin 15 that wood chip is derived, and when this cutting portion 14 continued 200 borings of a slice steel plate, fin 15 touched this steel plate 200 and will fracture, and when spiro tooth part 13 self tappings and screw lock are in this steel plate 200, this head 11 just supports and only is positioned on this plank 100, and makes SELF DRILLING SCREWS 10 reach engagement location purpose.And utilize reinforced ribs set on the fin 15 153, produce in the time of can avoiding being drilled with the harder plank 100 of quality and fracture ahead of time, and guarantee preferable chip removal function.

And effect of the present utility model is:

1. because fin 15 levels off to this drill lip portion 141, even in to these plank 100 borings, and when plank 100 hardness that are drilled with are hard, when wood chip produces, stirred by fin 15 immediately, and discharge smoothly, and fin 15 more can be not stuck yet in plank 100, be not easy to fracture ahead of time, it is good that row cuts effect.

2. also because fin 15 levels off to this drill lip portion 141,, be not easy to cause the tapping failure so the metal fillings that is produced when 141 pairs of steel plate 200 drillings of drill lip portion can be stirred eliminating by fin 15 immediately.

Again as shown in Figure 5, the SELF DRILLING SCREWS 10 ' of second preferred embodiment of the utility model is roughly the same with first embodiment, difference be in: the root edge 151 ' of described fin 15 ' coincides with this extension conical surface 143 ', that is to say, there is no the gap between the root edge 151 ' of fin 15 ' and this extension conical surface 143 '.And second embodiment also can reach purpose and the effect identical with first embodiment.

And for example shown in Figure 6, the SELF DRILLING SCREWS 10 of the 3rd preferred embodiment of the utility model " roughly the same with first embodiment; difference is in described fin 15 " root edge 151 " be flat; and perpendicular to this axis L; fin 15 " root edge 151 " with this cutting portion 14 " the joint level off to this extensions conical surface 143 "; and root edge 151 " and this cutting portion 14 " the joint, be and this extension conical surface 143 " between a little gap is arranged.The 3rd embodiment also can reach purpose and the effect identical with first embodiment.

As shown in Figure 7, the SELF DRILLING SCREWS 20 of the 4th preferred embodiment of the utility model and the 3rd embodiment are roughly the same, and difference is in the root edge 251 of: described fin 25 joint with this cutting portion 24 and is positioned on these drill lip portion 241 peripheries.And the 4th embodiment also can reach purpose and the effect identical with previous embodiment.

Claims

1. SELF DRILLING SCREWS comprises a head, one be fixed in this head one side along an axis bar portion, one and is arranged on this bar portion terminal part and is positioned at the cutting portion and a pair of fin that levels off to this cutting portion end of this spiro tooth part one side around this axis and the spiro tooth part, that are arranged on this bar portion outer circumferential face; It is characterized in that:

This cutting portion have one be located at end and have the drill lip portion of a cone angle and two by this drill lip portion towards cutting face that this spiro tooth part extends, and this drill lip portion by middle apex towards the periphery direction extension conical surface that extends outwardly out, described fin respectively has one to the root edge that should drill lip portion and the apical margin of an opposite setting with this root edge, the root edge of fin and this extend the distance of the conical surface, less than the distance between apical margin and this cutting portion top.

2. SELF DRILLING SCREWS as claimed in claim 1 is characterized in that: described fin also respectively has at least one reinforced ribs between between root edge and apical margin.

3. SELF DRILLING SCREWS as claimed in claim 2 is characterized in that: the root edge of described fin takes the form of inclined plane, and produces an angle with this axis.

4. SELF DRILLING SCREWS as claimed in claim 3 is characterized in that: the root edge of described fin levels off to this extension conical surface.

5. SELF DRILLING SCREWS as claimed in claim 3 is characterized in that: the root edge of described fin coincides with this extension conical surface.

6. SELF DRILLING SCREWS as claimed in claim 2 is characterized in that: the root edge of described fin is flat, and perpendicular to this axis.

7. SELF DRILLING SCREWS as claimed in claim 6 is characterized in that: the root edge of described fin and the joint of this cutting portion are to level off to this extension conical surface.

8. SELF DRILLING SCREWS as claimed in claim 6 is characterized in that: the root edge of described fin and the joint of this cutting portion are positioned on this drill lip portion periphery.