CN203979057U

CN203979057U - Self-tapping screws

Info

Publication number: CN203979057U
Application number: CN201420424822.8U
Authority: CN
Inventors: 陈明星; 黄冠仁; 陈俊甫
Original assignee: Schencho Industries Co ltd
Current assignee: Schencho Industries Co ltd
Priority date: 2014-07-30
Filing date: 2014-07-30
Publication date: 2014-12-03
Anticipated expiration: 2024-07-30

Abstract

A self-tapping screw comprises a screw head, a rod body, a drill bit formed at the bottom end of the rod body and a thread unit spirally formed on the outer surface of the rod body. The screw head is provided with a head part, a necking part which is formed below the head part in an extending way and is connected with one end of the rod body, a plurality of pressing blades which are connected with the necking part in an extending way through the bottom edge of the head part in an arc way, and a plurality of cutting blades which are convexly arranged on the bottom surface of the head part, wherein each cutting blade is respectively positioned between two adjacent pressing blades. The waste material generated by the self-tapping screw in the process of drilling an object is crushed by the secondary cutting action of the pressing blade and the cutting blade and is compacted on the periphery of the necking part of the self-tapping screw, the head of the screw head can be really embedded in the object, the outer surface of the object is kept flat and attractive, and the use safety can be improved.

Description

Self tapping screw

Technical field

The utility model, relevant for a kind of screw, refers to a kind of self tapping screw especially.

Background technique

Consulting Fig. 1, is a kind of existing self tapping screw 1, and its structure design comprises a spiral shell head 11, a screw rod 12, a drill bit 13, and a spiralization is in the screw thread 14 of these screw rod 12 outer surfaces.These spiral shell head 11 bottoms convergent are formed with a necking part 111 and are connected with these screw rod 12 one end, and 13, this drill bit is to be formed at this screw rod 12 the other ends.When this self tapping screw 1 is during for a sealed timber 2, utilize a driving tool (not shown) to be sheathed on the spiral shell head 11 of this self tapping screw 1, and then drive this self tapping screw 1 to carry out spiral in this timber 2 to advance, to reach the effect of sealed timber 2.

Because the wood chip 21 producing in twist bit process can be pushed toward spiral shell head 11 directions along with the turn of screw thread 14, but because wood chip 21 is sheet long fibre, therefore easily chip removal is piled up in and bores mouthful 22 places, the wood chip 21 that bores mouthful 22 places along with the sinking to gradually this timber 2 of spiral shell head 11 to being positioned at produces the effect of pressing, further cause the necking part 111 of this spiral shell head 11 cannot imbed completely in this timber 2, this spiral shell head 11 also cannot be immersed oneself in this timber 2 completely and be convex, if now continue again application of force spiral, the wood chip 21 that is piled up in brill mouthful 22 places can be with powerful reaction force acts in boring mouth 22, can cause at last this timber 2 to crack, the wood chip 21 so exposing, spiral shell head 11 and the crackle of projection all can affect the attractive in appearance of this timber 2, and careless slightly spiral shell head 11 and protruding wood chip 21 scratches that expose that more easily suffer this self tapping screw 1 of personnel, safety in utilization is not good.

Model utility content

Therefore, the purpose of this utility model is to provide a kind of can make the certain compacting of waste material producing in twist bit process take in and not expose, and then can also improve the self tapping screw of safety in utilization.

The utility model self tapping screw, it comprises a spiral shell head, a body of rod, a drill bit and a threaded elements.This spiral shell head has a head, a compacting sword that extends to form the necking part in the below of this head, this necking part of a plurality of root edge arc by this head extension connection, and a plurality of cutting edges that are convexly set in the bottom surface of this head, each cutting edge is positioned between two adjacent compacting swords.One end of this body of rod connects the necking part of this spiral shell head.This drill bit is formed at the other end of this body of rod.This threaded elements spiralization is in the outer surface of this body of rod.

The utility model self tapping screw, the angle between the bottom surface of the head of described cutting edge and this spiral shell head is for being less than or equal to 90 degree.

The utility model self tapping screw, this threaded elements has first thread section and second thread section.

The beneficial effects of the utility model are, setting by described cutting edge and described compacting sword, can make this self tapping screw in the process of twist bit one object, the waste material producing first cuts for the first time through described compacting sword, then recycling described cutting edge cuts again to the described waste material having shortened, borrow simultaneously this spiral shell head head be sunken to down in this object gradually, so that be the necking part periphery that the waste material of broken state is compacted at this self tapping screw, the head of this spiral shell head also can positively be immersed oneself in this object, so, not only can make this object outer surface remain smooth and attractive in appearance, improve safety in utilization, also can improve the stability of this self tapping screw.

Accompanying drawing explanation

Fig. 1 is a schematic diagram, illustrates that a kind of existing self tapping screw is used aspect.

Fig. 2 is a schematic diagram, and an embodiment of the utility model self tapping screw is described.

Fig. 3 is a bottom view, illustrates that aspect is looked at this embodiment's the end.

Fig. 4 is a partial schematic diagram, and a kind of aspect of a plurality of cutting edges of this embodiment is described.

Fig. 5 is a partial schematic diagram, and the another kind of aspect of this embodiment's described cutting edge is described.

Fig. 6 is a partial schematic diagram, and another aspect of this embodiment's described cutting edge is described.

Fig. 7 is a use schematic diagram, and this embodiment's use aspect is described.

Embodiment

About aforementioned and other technology contents, feature and effect of the present utility model, in the following detailed description coordinating with reference to a graphic preferred embodiment, can clearly present.

Consult Fig. 2, Fig. 3, an embodiment of the utility model self tapping screw 3, it comprises a spiral shell head 31, a body of rod 32, a drill bit 33 and a threaded elements 34.This spiral shell head 31 has a head 311, and extends to form the necking part 312 in this head 311 belows, a plurality of compacting sword 313 that is extended this necking part 312 of connection by these head 311 root edge arcs, and a plurality of cutting edge 314 that is convexly set in these head 311 bottom surfaces.Each cutting edge 314 is positioned at 313 of two adjacent compacting swords.And the angle between head 311 bottom surfaces of described cutting edge 314 and this spiral shell head 31 is for being less than or equal to 90 degree, the aspect as shown in Fig. 4, Fig. 5, Fig. 6.

Continue and consult Fig. 2, these body of rod 32 one end connect the necking part 312 of this spiral shell head 31.33, this drill bit is to be formed at this body of rod 32 the other ends.In addition, 34 of this threaded elements are that spiralization is in these body of rod 32 outer surfaces.This threaded elements 34 has one first thread section 341, and one second thread section 342, but not as limit, this threaded elements 34 also can be single thread section.

Consult Fig. 3, Fig. 7, in the use, this self tapping screw 3 can be used for boring lock one object 4, and in the present embodiment, this object 4 is to explain with timber.This self tapping screw 3 is when twist bit, first with these drill bit 33 these object 4 surfaces of conflict, recycle the head 311 that a driving tool (not shown) is engaged in this self tapping screw 3, then drive this self tapping screw 3 to borrow these spiral unit 34 spirals to enter this object 4, when the compacting sword 313 on the necking part 312 of this self tapping screw 3 touches this object 4, can cut the wood chip 41 producing in twist bit process, wood chip 41 length are shortened, then recycling the wood chip 41 having shortened described in 314 pairs of described cutting edges cuts again, being sunken to down gradually in this object 4 by the head 311 of this spiral shell head 31 simultaneously, the wood chip 41 that is broken state be compacted to necking part 312 peripheries of this self tapping screw 3 and be embedded in completely in this object 4, the head 311 of this spiral shell head 31 also can positively be immersed oneself in this object 4, so not only this object 4 can not crack, and can make these object 4 outer surfaces remain smooth and attractive in appearance, and can improve safety in utilization.In addition, by wood chip 41, be compacted at necking part 312 peripheries of this self tapping screw 3, also can increase the stability of this self tapping screw 3.

In sum, the utility model self tapping screw 3 designs by above-mentioned structure, the waste material that can make this self tapping screw 3 produce in the process of this object 4 of twist bit, can successively through described compacting sword 313, cut for the first time, again cut with the waste material having shortened described in 314 pairs of described cutting edges, and the waste cut materials that makes to be broken state can be compacted at necking part 312 peripheries of this self tapping screw 3, the head 311 of this spiral shell head 31 also can positively be immersed oneself in this object 4, not only this object 4 can not crack, and can make these object 4 outer surfaces remain smooth and attractive in appearance, 31 scratches of spiral shell head that personnel also can not be protruded, thereby can improve safety in utilization.In addition, by the waste cut materials that is broken state, be compacted at necking part 312 peripheries of this self tapping screw 3, also can improve the stability of this self tapping screw 3.

The foregoing is only the utility model preferred embodiment; so it is not in order to limit scope of the present utility model; anyone familiar with this technology; within not departing from spirit and scope of the present utility model; can do on this basis further improvement and variation, the scope that claims were defined that therefore protection domain of the present utility model is worked as with the application is as the criterion.

Claims

1. a self tapping screw, is characterized in that, comprises:

A spiral shell head, have a head, compacting sword and an a plurality of cutting edge that is convexly set in the bottom surface of this head that extends to form the necking part in the below of this head, this necking part of a plurality of root edge arc by this head extension connection, each cutting edge is positioned between two adjacent compacting swords;

A body of rod, one end of this body of rod connects the necking part of this spiral shell head;

A drill bit, is formed at the other end of this body of rod; And

A threaded elements, spiralization is in the outer surface of this body of rod.

2. self tapping screw according to claim 1, is characterized in that, the angle between the bottom surface of the head of described cutting edge and this spiral shell head is for being less than or equal to 90 degree.

3. according to self tapping screw described in claim 1 or 2, it is characterized in that, this threaded elements has first thread section and second thread section.