CN201517542U

CN201517542U - Improved self drilling screw structure

Info

Publication number: CN201517542U
Application number: CN2009201794883U
Authority: CN
Inventors: 陈金辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-09-25
Filing date: 2009-09-25
Publication date: 2010-06-30
Anticipated expiration: 2019-09-25

Abstract

The utility model discloses an improved self drilling screw structure, comprising a head section, a lever portion connected with the head section, a screw section arranged on the surface of the lever portion, a drill tail arranged on the lever portion relative to the other end of the head section, a first knife-edge portion and a second knife-edge portion respectively located at both sides at the centre point of the lever portion at the tip of the drill tail, a first scraps-guiding groove and a second guiding groove extending to the screw section and respectively arranged at the first knife-edge portion and the second knife-edge portion, and a third scraps-guiding groove extending from the first scraps-guiding groove. An included angle is formed between the third scraps-guiding groove and the first scraps-guiding groove to hoist the scraps-breaking capability of the self drilling screw, so that the drill tail of the self drilling screw is easy to discharge the scraps and is efficiently screwed into the workpiece with labour saving.

Description

The SELF DRILLING SCREWS structure improvement

Technical field

The utility model is relevant for a kind of SELF DRILLING SCREWS structure improvement, particularly relevant for a kind of SELF DRILLING SCREWS structure that strengthens screw dust lead, chip breaking and chip removal ability.

Background technique

At present, in the combination of some workpiece, can't attack in advance often and get out screw and tighten up a screw again, in construction occasions such as the unrestrained plate of ceiling board, the fixedly installing of aluminium door aluminum window, all must use the self tapping SELF DRILLING SCREWS and once lock workpiece.The structure of general common self tapping SELF DRILLING SCREWS 1 (as shown in Figure 1), the head of its screw has multiple different size, with in response to different fields of employment, as hexagonal headpin cushioning circle, the brill portion 11 of one section suitable length is established at its screw tip, and this brill portion 11 is the flat cylindricality of two sides symmetry, and its tail end has been led apex point 112, apex point 112 both sides have blade 111 respectively, and are provided with dregs guiding groove 113 towards thread in blade 111 1 sides.Above-mentioned self tapping SELF DRILLING SCREWS 10 structures are flat obelisk shape because of this brill portion 11, its resistance is very big, the borehole effect is unclear, though and the workpiece that screw dug out bits are provided with dregs guiding groove 113, but it is not good because of designing, can't be effectively with the chopping of long size work bits and major part remains in the hole that is got out, the resistance that causes bigger boring to be screwed into makes to be screwed into/work of piercing can't carry out smoothly and apace.

The model utility content

Problem to be solved in the utility model mainly is to provide a kind of dregs guiding groove that extends the angle variation that has, with the SELF DRILLING SCREWS structure of effectively the workpiece bits being cut off.

For the problems referred to above are achieved a solution, the utility model provides a kind of SELF DRILLING SCREWS structure improvement, comprises: a head; One axially connects the bar portion of this head; One is arranged at the spiro tooth part on this bar portion surface; One is located at the brill afterbody of this bar portion with respect to this head the other end, this brill tail end has one first blade and one second blade that lays respectively at these bar portion central point both sides, and this first blade and this second blade are respectively equipped with first dregs guiding groove and one second dregs guiding groove that extends to this spiro tooth part; And the 3rd dregs guiding groove that extends from this first dregs guiding groove, and has an angle between the 3rd dregs guiding groove and this first dregs guiding groove.

The terminal corrigendum of the second above-mentioned dregs guiding groove is extended with one the 4th dregs guiding groove that is an angle mutually.

Characteristics of the present utility model are the angle between first dregs guiding groove of the present utility model and the 3rd dregs guiding groove, can form a knuckle at the sidewall clip of this first dregs guiding groove and the 3rd dregs guiding groove, straight line clip than the single dregs guiding groove of prior art, better shear ability is arranged, can pierce in the process in SELF DRILLING SCREWS, the long bits that newly grow up to behind the blade cutting workpiece are in time cut off be chip, and in the Luo Gu space of lead-in groove, can avoid long bits to cause on the one hand and more press from both sides the big resistance that pierces of healing, on the one hand can be after SELF DRILLING SCREWS be screwed into workpiece, the chip that enters the Luo Gu space forms the snap-in force of SELF DRILLING SCREWS to workpiece, increases SELF DRILLING SCREWS spiral shell solidity.Certainly, between second dregs guiding groove and the 4th dregs guiding groove, has above-mentioned effect equally.

Description of drawings

Fig. 1 illustrates the self-tapping drill tail tap dental structure schematic perspective view of prior art;

Fig. 2 illustrates the utility model one embodiment's schematic perspective view;

Fig. 3 illustrates Fig. 2 embodiment's front view;

Fig. 4 illustrates Fig. 2 embodiment's rear view;

Fig. 5 illustrates Fig. 2 embodiment's left view.

Fig. 6 illustrates another embodiment's of the utility model front view; And

Fig. 7 illustrates the utility model front view of an embodiment again.

The primary clustering symbol description

[conventional construction]

10 self tapping SELF DRILLING SCREWS

11 brill portions

111 blades

112 apex points

113 dregs guiding grooves

[the utility model structure]

20,20 ', 20 " SELF DRILLING SCREWS

21 heads

22 bar portions

221 spiro tooth parts

23 bore afterbody

231 first blades

232 second blades

233 first dregs guiding grooves

234 second dregs guiding grooves

235 the 3rd dregs guiding grooves

236 the 4th dregs guiding grooves

24 apex points

25 knife edge mouths

26 little wedge angles

A, B, C, D angle

X, the Y sidewall

Embodiment

Now cooperate graphic the utility model preferred embodiment to be described in detail as follows, its appended graphic schematic representation that is through simplifying only illustrates basic structure of the present utility model in a schematic way.Therefore in those diagrams, only indicate the assembly relevant with the utility model, and shown assembly is not, and number when implementing, shape, dimension scale etc. are drawn, specification during its actual enforcement is real to be a kind of optionally design, and its assembly layout form might be more complicated, closes earlier and state clearly.

The utility model is a kind of SELF DRILLING SCREWS structure improvement, sees also Fig. 2, Fig. 3, Fig. 4 and shown in Figure 5, comprising: a head 21; One axially connects the bar portion 22 of this head 21; One is arranged at the spiro tooth part 221 on these bar portion 22 surfaces; One is located at the brill afterbody 23 of this bar portion 22 with respect to these head 21 the other ends, these brill afterbody 23 ends have one first blade 231 and one second blade 232 that lays respectively at these bar portion 22 central point both sides, and this first blade 231 and this second blade 232 are respectively equipped with first dregs guiding groove 233 and one second dregs guiding groove 234 that extends to this spiro tooth part 221; And the 3rd dregs guiding groove 235 that extends from this first dregs guiding groove 233, and has an included angle A between the 3rd dregs guiding groove 235 and this first dregs guiding groove 233.

Above-mentioned this second dregs guiding groove 234 more can establish one by these second dregs guiding groove, 234 extended the 4th dregs guiding grooves 236, and has an included angle B between the 4th dregs guiding groove 236 and this second dregs guiding groove 234.

According to before taking off structure, when using SELF DRILLING SCREWS 20 to be screwed into the workpiece (not shown), first blade 231 of this SELF DRILLING SCREWS 20, the workpiece that second blade 232 is cut bits import this first dregs guiding groove 233 and the 3rd dregs guiding groove 235 and second dregs guiding groove 234 and the 4th dregs guiding groove 236 then.

Because be continu to press in drilling process, therefore by first blade 231, the workpiece bits that second blade 232 is cut will form the long bits of continuous strip, after long bits are gradually long, extend to spiro tooth part 221 then, and in the process of SELF DRILLING SCREWS 20 rotations, the sidewall X of this first dregs guiding groove 233 and the 3rd dregs guiding groove 235, the sidewall Y of this second dregs guiding groove 234 and the 4th dregs guiding groove 236, cooperate after the workpiece hole wall (not shown) that is pierced, with forming a clip with knuckle, the long bits (entering larger-diameter spiro tooth part 221 by the brill afterbody 23 than the minor diameter place) of just having grown up in time can be cut off (or claiming to grind disconnected).

And, being cut into little disconnected chip, in the process that SELF DRILLING SCREWS is screwed into, more can insert smoothly among the Luo Gu gap of thread, be beneficial to apace, non-resistance ground is screwed into SELF DRILLING SCREWS 20 in the workpiece.

What deserves to be mentioned is, first dregs guiding groove 233 of the present utility model, the 3rd dregs guiding groove 235 and second dregs guiding groove 234, the 4th dregs guiding groove 236 formed included angle A, B can do different variations, as Fig. 6, shown in Figure 7 in, in SELF DRILLING SCREWS 20 ' embodiment, can form the angle C of different amount, in SELF DRILLING SCREWS 20 " can form the angle D of different amount among the embodiment; in these embodiments, can produce good chip breaking effect equally.

To sum up, angle between first dregs guiding groove of the present utility model and the 3rd dregs guiding groove (and second dregs guiding groove and the 4th dregs guiding groove), can form a knuckle at its sidewall clip, shear ability than the straight line clip of the single dregs guiding groove of prior art is good, can pierce in the workpiece process in SELF DRILLING SCREWS, the long bits that newly grow up to behind the blade cutting workpiece are in time cut off be chip, and in the Luo Gu space of lead-in groove, can avoid long bits to cause on the one hand and more press from both sides the big resistance that pierces of healing, on the one hand can be after SELF DRILLING SCREWS be screwed into workpiece, the chip that enters the Luo Gu space forms the snap-in force of SELF DRILLING SCREWS to workpiece, increases the solid effect of spiral shell.

Though the utility model discloses as above with all embodiments; right its is not in order to limiting the utility model, anyly has the knack of alike skill person, in not breaking away from spirit and scope of the present utility model; the equivalence of doing to change with retouching is replaced, and still is in the scope of patent protection of the present utility model.

Claims

1. a SELF DRILLING SCREWS structure improvement is characterized in that, comprising:

One head;

One axially connects the bar portion of this head;

One is arranged at the spiro tooth part on this bar portion surface;

One is located at the brill afterbody of this bar portion with respect to this head the other end, this brill tail end has one first blade and one second blade that lays respectively at these bar portion central point both sides, and this first blade and this second blade are respectively equipped with first dregs guiding groove and one second dregs guiding groove that extends to this spiro tooth part; And

One extends the 3rd dregs guiding groove from this first dregs guiding groove, and has an angle between the 3rd dregs guiding groove and this first dregs guiding groove.

2. SELF DRILLING SCREWS structure improvement as claimed in claim 1 is characterized in that: this second dregs guiding groove more is provided with one the 4th dregs guiding groove that is extended by this second dregs guiding groove, and has an angle between the 4th dregs guiding groove and this second dregs guiding groove.

3. SELF DRILLING SCREWS structure improvement as claimed in claim 1 or 2 is characterized in that: this second blade is provided with a knife edge mouth near this bar portion central point apex point side, makes and forms a little wedge angle on the apex point top end.