CN2771548Y

CN2771548Y - a screw

Info

Publication number: CN2771548Y
Application number: CN 200420057117
Authority: CN
Inventors: 苏国材
Original assignee: Laixiang Co ltd
Current assignee: Laixiang Co ltd
Priority date: 2004-11-15
Filing date: 2004-11-15
Publication date: 2006-04-12
Anticipated expiration: 2014-11-15

Abstract

The utility model discloses a screw, which comprises a screw head and a rod body arranged on the screw head; the screw rod body is annularly provided with spiral screw teeth, the free end of the rod body is a screw cone part with the inner diameter gradually converging, the screw cone part is provided with a flat area and an annular cone surface extending outwards from the flat area, and particularly, the flat area is provided with a blade by utilizing the arrangement of a rib block or a groove, so that the bearing capacity of the blade can be reduced by matching with the auxiliary cutting of the blade in the locking process, and the effects of reducing torque, quickly locking and the like are achieved.

Description

A kind of screw

Technical field

The utility model relates to a kind of screw.

Background technique

Because the screw kind is numerous, if distinguished with the screw substructure, can be divided into the design of boring tail and directly forming taper, wherein, aforesaid taper design is more considered sealed process and is held bits and cutting effect for increasing, and offers a chip removal ditch, to be formed with a cutting edge, its aufbauprinciple is identical, below only is illustrated with SELF DRILLING SCREWS.

See also Fig. 1, known SELF DRILLING SCREWS 1 comprises a spiral shell head 11, and one and the body of rod 12 that links of this spiral shell head 11; Wherein, this body of rod 12 is equipped with most spiral helicine threads 121, and these body of rod 12 ends are internal diameter convergent spiral shell tapering 122 gradually, and this spiral shell tapering 122 has a flat region 123, and one by these flat region 123 outward extending annular conical surfaces 124, offer two chip removal ditches 125 (only showing because of view relation among the figure) simultaneously on this spiral shell tapering 122, and this chip removal ditch 125 is formed with a cutting edge 126 respectively with this flat region 123, annular conical surface 124 connecting parts; Cooperate and to consult Fig. 2, when on object 10, carrying out sealed operation,, guiding this screw 1 sealed entering, and then reach the effect sealed and location by these cutting edge 126 drillings in advance.

But, on reality was used, it but still had and improves part, and details are as follows:

1, because the manufacturing in the spiral shell tapering 122 of this screw 1, system directly is stamped to form by two moulds (scheming not shown), make the sharpness of cutting edge 126 in this spiral shell tapering 122 depend on processing technique fully, except that the cutting effect that influences this cutting edge 126, relatively influence the sealed efficient of screw 1, the inconvenience that will cause screw 1 to use virtually.

2, still continuous aforementioned, manufacturing because of the spiral shell tapering 122 of this screw 1, system directly is stamped to form by two moulds (scheming not shown), cause spiral shell tapering 122 slightly to be flat, causing the cutting edge 126 formed length of 122 both sides, spiral shell tapering is maximum diameter, so when carrying out sealed operation, to cause sealed resistance to concentrate entirely on the cutting edge 126 of both sides, so the builder need bestow bigger screw-in torsion, can on object 10, carry out sealed, so that this cutting edge 126 will bear bigger sealed moment of torsion, except that reducing sealed speed, and very easily cause cutting edge 126 to produce and damage phenomenon of rupture, influence the drilling ability of cutting edge 126 sealed processes, sealed process will more be required great effort, remain in fact to be improved.

The model utility content

The purpose of this utility model is to provide a kind of screw, but its fast locking in the use, and can reduce sealed moment of torsion.

For achieving the above object, technical solution of the present utility model is: a kind of screw, it comprises a spiral shell head and a body of rod of being located on the spiral shell head, be that center ring is provided with spiral helicine thread with body of rod center line on the circumferential surface of this body of rod, and this body of rod free end is internal diameter convergent spiral shell tapering gradually, and this spiral shell tapering has a flat region and by the outward extending annular conical surface in this flat region; Convex with at least one rib piece on the described flat region, but and this each rib piece end be formed with the blade of an assisted machining.And this rib piece and body of rod center line can be inclined to set.

A kind of screw, it comprises a spiral shell head and a body of rod of being located on the spiral shell head, be that center ring is provided with spiral helicine thread with body of rod center line on the circumferential surface of this body of rod, and this body of rod free end is internal diameter convergent spiral shell tapering gradually, and this spiral shell tapering has a flat region and by the outward extending annular conical surface in this flat region; Offer at least one groove on the described flat region, but and this each groove and body of rod circumferential surface jointing place be formed with the blade of an assisted machining.And this groove and body of rod center line can be inclined to set.

At least offer a chip removal ditch on the described spiral shell tapering, and this chip removal ditch and this annular conical surface, connecting part, flat region are formed with a cutting edge respectively.

After adopting such scheme, the utility model and known work one are compared,, illustrate one by one in following when learning that the utility model has the enhancement part really in practicality:

1, because described flat region is provided with rib piece or groove aspect, and be formed with the design of blade, to help object is produced the assisted machining effect, so that the manufacturing of this screw will not be influenced by the sharpness of this cutting edge will, thereby can keep preferable sealed speed, will help cutting successfully to carry out.

2, still continuous aforementioned, should be when screw closure, except that utilize original cutting edge hole the cutting, but described blade is the assisted machining object also, and it can reach outside the effect of screw fast locking, and this blade also can be shared the resistance that is produced in the sealed process, be subjected to sealed moment of torsion excessive and produce the situation of damaging fracture to reduce cutting edge, to guarantee the sharpness of cutting edge, relatively, sealed efficient will more promote.

Description of drawings

Fig. 1 is the schematic representation of known screw;

Fig. 2 is that the user mode of the known screw of Fig. 1 is looked closely generalized section;

Fig. 3 is the schematic representation of the utility model screw first preferred embodiment;

Fig. 4 is that the user mode of Fig. 3 preferred embodiment is looked closely generalized section;

Fig. 5 is the schematic representation of the utility model screw second preferred embodiment;

Fig. 6 is the schematic representation of the utility model screw the 3rd preferred embodiment;

Fig. 7 is the schematic representation of the utility model screw the 4th preferred embodiment.

Embodiment

Before the utility model is described in detail, be noted that in the following description similarly assembly is to represent with identical numbering.

Consult Fig. 3, it is first preferred embodiment of the utility model screw 2, and this embodiment system illustrates with SELF DRILLING SCREWS, and this screw 2 comprises a spiral shell head 21 and a body of rod 22; Wherein, these body of rod 22 1 ends and this spiral shell head 21 are connected, and be that center ring is provided with spiral helicine thread 222 with body of rod center line a on the circumferential surface 221 of this body of rod 22, and the free end of the aforementioned body of rod 22 is internal diameter convergent spiral shell tapering 223 gradually, and this spiral shell tapering 223 has a flat region 224, and one by these flat region 224 outward extending annular conical surfaces 225, offer two chip removal ditches 226 on this spiral shell tapering 223 simultaneously, and this chip removal ditch 226 and this flat region 224, annular conical surface 225 connecting parts are formed with a cutting edge 227 respectively, particularly, convex with plural rib piece 228 on this flat region 224, and this each rib piece 228 is parallel to the center line a of the body of rod, and each these rib piece 228 end is formed with a blade 229 simultaneously; Certainly, this each rib piece 228 also can be inclined to set (as shown in Figure 5) with body of rod center line a; Be that example is illustrated only in the present embodiment with the graphic of parallel body of rod center line a.

Cooperate and consult Fig. 4, this screw 2 is when carrying out sealed operation, the builder contacts at the spiral shell tapering 223 of this screw 2 and treats on the sealed object 20, and bestow a rotary torsion constantly in this spiral shell head 21, this cutting edge 227 of its synchronous interlock, be screwed in this object 20 so that can attack gradually, except that this cutting edge 227 is kept complete sharp keen cutting effect, cooperate this formed blade 229 in rib piece 228 ends again, so that this cutting edge 227 is when being screwed into, can utilize the assisted machining of blade 229,, enter in the object 20 thereby help screw 2 fast lockings to reach quick cutting object 20.

Moreover, the setting of this plural number rib piece 228, the sealed resistance that is produced in the sealed process is evenly distributed on this blade 229, remove the cutting resistance that can reduce this blade 229 when sealed, decrease outside the phenomenon because of collapsing of the excessive generation of sealed moment of torsion to reduce cutting edge 227, when this screw 2 is made, no matter the sharpness of this cutting edge 227 is too blunt or too sharp, the assisted machining that blade 229 is still arranged, so can reduce the whether sharp keen aspect that influences of cutting edge 227 really, relatively, the influence of manufacturing technology can be reduced to minimum.

Consult Fig. 6, it is the 3rd preferred embodiment of the utility model screw 3, this screw 3 still comprises a spiral shell head 31 and and is located at members such as the body of rod 32 on the spiral shell head 31, and present embodiment and previous embodiment difference are: offer plural groove 328 on this flat region 324, and this groove 328 is parallel to body of rod center line a, and this groove 328 is formed with a blade 329 with the body of rod 32 circumferential surfaces 321 jointing places simultaneously; Certainly, this groove 328 also can be inclined to set with body of rod center line a as shown in Figure 7, no matter and this groove 328 is parallel or is obliquely installed, be blade 329, and in sealed process, all can produce the assisted machining effect, can reduce the strength of cutting edge 327, to reach the effect that is same as first preferred embodiment object.

Conclude aforementioned, screw described in the utility model is provided with rib piece or groove aspect by this flat region, and be formed with the design of blade, so in sealed process, except that utilizing the cutting edge cutting, the assisted machining that also can cooperate blade again can reduce the strength of cutting edge, so have fast locking on using and reduce the effect of sealed moment of torsion.

Claims

1. A screw, which includes a screw head and a rod body arranged on the screw head. The peripheral surface of the rod body is provided with helical thread with the center line of the rod body as the center ring, and the free end of the rod body has an inner diameter gradually A converging spiral cone portion, and the spiral cone portion has a flat area and an annular cone surface extending outward from the flat area; it is characterized in that:

At least one rib protrudes from the flat area, and a cutting edge is formed on the end surface of each rib.

2. A screw according to claim 1, characterized in that the rib is inclined to the center line of the rod body.

3. A screw according to claim 1, characterized in that: at least one chip removal groove is provided on the screw cone, and a cutting edge is formed at the junction of the chip removal groove with the ring cone surface and the flat area. .

4. A screw, which includes a screw head and a rod body arranged on the screw head. The peripheral surface of the rod body is provided with helical thread with the center line of the rod body as the center ring, and the free end of the rod body has an inner diameter gradually A converging spiral cone portion, and the spiral cone portion has a flat area and an annular cone surface extending outward from the flat area; it is characterized in that:

At least one groove is opened on the flat area, and a cutting edge is formed at the junction of each groove and the peripheral surface of the rod body.

5. A screw according to claim 4, characterized in that the groove is inclined to the center line of the rod body.

6. A screw according to claim 4, characterized in that: at least one chip removal groove is opened on the screw cone portion, and a cutting edge is formed at the junction of the chip removal groove with the ring cone surface and the flat area. .