CN2460781Y

CN2460781Y - Screw with flat head

Info

Publication number: CN2460781Y
Application number: CN 00268676
Authority: CN
Inventors: 尤肇欣; 陈金孙
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-12-27
Filing date: 2000-12-27
Publication date: 2001-11-21
Anticipated expiration: 2010-12-27

Abstract

The utility model relates to a screw with a flat head. The utility model is provided with a screw body, the axial surface of the screw body forms into a screw thread which is extended axially, and at least one cutting trough is arranged at the tail end part of the screw body. A row of bit troughs is dug form a cutting trough mouth of the upper part of the cutting trough to the center of the screw body, and a row of bit troughs is extended in the screw body and surpasses a predetermined angle of a central line of the screw body; the cutting bits can be avoided to block the cutting troughs.

Description

Thread screw

The utility model relates to a kind of thread screw, particularly relates to a kind ofly having special groove and can avoiding smear metal to block the grooving mouth, increases the thread screw structure of shear action.

Existing at screw body 1,2 afterbodys have groove 3,4, please cooperate and consult Fig. 1 to shown in Figure 4, no matter groove 3,4 two side cuts 301,401 are set as straight flange shape or hypotenuse shape, because of its groove mouth 5,6 are set as an angle of 90 degrees, make screw body 1,2 outer periphery and this two side cut 301,401 corner cut θ is more than or equal to 90 degree, suitable cutting effect is arranged when just beginning to lock object, but, when the degree of depth of locking surpasses the length of groove, lock the wood chip that object produces because of continuing tapping, iron filings, in case fill up groove mouth 5,6, this groove 3 then, 4 two side cuts 301,401 promptly can't continue to produce shear action again, are bound to this moment to such an extent that increase the application of force and expend time in; Moreover, because big resistance that can't chip removal produced will make screw because of the torsion that bears increases, easily cause screw distortion, damage ahead of time, and shorten its working life.

The purpose of this utility model is to provide a kind of thread screw, and it can be discharged smear metal smoothly, to improve cutting power.

The purpose of this utility model is achieved in that promptly provides a kind of thread screw, and it has a screw body, and the axial plane of this screw body is formed with axially extended thread, and is provided with at least one groove that cuts at its tail end; This grooving mouth that cuts the groove top digs toward the center of screw body again establishes a groove, and this groove penetrates with screw body inside, and surmounts its center line one predetermined angle, so that the effect of avoiding smear metal to block the grooving mouth to be provided.

The advantage of the utility model device is that it is provided with a groove, makes screw in use, and resistance is little, and the torsion that bears reduces, thus the working life of improving this screw.

Below in conjunction with accompanying drawing, describe embodiment of the present utility model in detail, wherein:

Fig. 1 is the side view of existing thread screw;

Fig. 2 is the bottom view of Fig. 1 thread screw;

Fig. 3 is the side view of another kind of existing thread screw;

Fig. 4 is the bottom view of Fig. 3 thread screw;

Fig. 5 is the side view of the utility model first preferred embodiment thread screw;

Fig. 6 is the bottom view of Fig. 5 thread screw;

Fig. 7 is the side view of the utility model second preferred embodiment thread screw;

Fig. 8 is the bottom view of Fig. 7 thread screw;

Fig. 9 is the side view of the utility model the 3rd preferred embodiment thread screw;

Figure 10 is the side view of the utility model the 4th preferred embodiment thread screw;

Figure 11 is the bottom view of the utility model the 5th preferred embodiment thread screw;

Figure 12 is the bottom view of the utility model the 6th preferred embodiment thread screw.

See also Fig. 5 and shown in Figure 6, the utility model thread screw 10, it has a screw body 11, the axial plane of this screw body 11 is formed with axially extended thread 12, and be provided with two at its tail end and cut groove 13, in the present embodiment, this two grooving mouth 14 that cuts groove 13 tops is set as rectangular-shaped and is about an angle of 90 degrees, be so-called right angle cutting knife, constituting respectively, these two side cuts 15 of cutting groove 13 are set as the straight flange shape; The utility model main feature is:

Respectively these grooving mouth 14 tops of cutting groove 13 also are provided with a groove 16, this groove 16 is set as rectangular-shaped, and by deep again inside, these grooving mouth 14 places toward screw body 11, and center line a one predetermined angle that surmounts screw body 11, cause corner cut θ 1 by screw body 11 and respectively 15 of this side cuts less than 90 degree, form sharp keen shape, therefore has preferable shear action, respectively this cuts 15 smear metals that cutting is got off of two side cuts of groove 13, more being able to cut groove 13 along this up and via this groove 16 discharges, can avoid smear metal to block grooving mouth 14, make the screw body 11 can be quick, successfully carry out the action that object is locked in tapping.

Fig. 7 and shown in Figure 8, it is second preferred embodiment of the utility model thread screw 20, itself and earlier figures 5 only is with the difference of the utility model first preferred embodiment shown in Figure 6, respectively this grooving mouth 24 and this groove 26 that cuts groove 23 tops is set as circular-arc, it has the identical effect with the utility model first embodiment equally, and this grooving mouth 24 is set as the circular-arc so-called round cutting knife that is.

As shown in Figure 9, it is the 3rd preferred embodiment of the utility model thread screw 30, and its two side cuts 35 that will cut groove 33 are set as the hypotenuse shape, and this grooving mouth 34 and this groove 36 all are set as rectangular-shaped.

As shown in figure 10, it is the 4th preferred embodiment of the utility model thread screw 40, and its two side cuts 45 that will cut groove 43 are set as the hypotenuse shape, and this grooving mouth 44 and this groove 46 all are set as circular-arc.

Each above embodiment of the utility model is set as two structures of cutting groove, make the two incision and two grooves of screw body because of having symmetry, the speed that makes the screw tapping lock object increases to has only the groove of cutting more than one times, and make the torsion of screw-in also can reduce more than one times, and screw body locked in the object more reposefully, and can reach the effect of expection; Taking into account under the prerequisite that the screw tail end must have suitable structural strength, be set as the effect that three structures of cutting groove then can be quickened chip removal, also belong to technology category of the present utility model (as Figure 11 and shown in Figure 12).

Claims

1. thread screw, it has a screw body, and the axial plane of described screw body is formed with axially extended thread, and is provided with at least one groove that cuts at its tail end; It is characterized in that: the described grooving mouth that cuts the groove top digs toward the center of screw body again establishes a groove, and described groove penetrates with the inside of screw body, and surmounts its center line one predetermined angle.

2. a kind of thread screw as claimed in claim 1 is characterized in that described groove is set as rectangular-shaped.

3. a kind of thread screw as claimed in claim 1 is characterized in that described groove is set as circular-arc.

4. a kind of thread screw as claimed in claim 1 is characterized in that, the described grooving mouth that cuts groove is set as rectangular-shaped.

5. a kind of thread screw as claimed in claim 1 is characterized in that, the described grooving mouth that cuts groove is set as circular-arc.

6. a kind of thread screw as claimed in claim 1 is characterized in that, constitutes described two side cuts of cutting groove and is the straight flange shape.

7. a kind of thread screw as claimed in claim 1 is characterized in that, constitutes described two side cuts of cutting groove and is the hypotenuse shape.

8. a kind of thread screw as claimed in claim 1 is characterized in that, constitutes described three side cuts of cutting groove and is the straight flange shape.

9. a kind of thread screw as claimed in claim 1 is characterized in that, constitutes described three side cuts of cutting groove and is the hypotenuse shape.