TWM635249U - Screw head drill blade and flat drill tail anti-crack structure - Google Patents

Abstract

A screw comprising: a head with a flange; a cylinder extending from the head with a plurality of turns of threads formed around the cylinder; a plurality of drill blades protruding from the surface of the head, the drill blades extending from the flange to a cylinder; and, a flat drill portion comprising: two planes formed on the front and back of the cylinder, intersecting each other on a virtual centerline passing through the screw axis; two convex surfaces extending from the outer surface of the cylinder , each convex surface is adjacent to the same side of the two planes to form an obtuse angle and a blade, the distance between the two blades is regarded as a width of the flat drill part, and the distance between the two planes is defined as a thickness of the flat drill part, the thickness Less than half the width, which is less than the diameter of a thread; two bevels on either side of the flat drill, each bevel connected at one end to the convex surface and at the other end to the said intersection where it gathers with the plane to form a point .

Description

Screw head drill blade and flat drill tail anti-crack structure

This creation relates to the field of locking, especially a kind of drill blade, which is suitable for the heads of anti-crack screws, wood screws and other screws, and a flat anti-crack structure of the drill tail.

The difference in the material of an item, the use of screws of different designs, is nothing more than the acceleration of drilling, the improvement of chip removal, and even the labor-saving degree of locking, etc. Continuously develop and innovate various screws to achieve practical benefits. ideal state.

However, as the screw continues to drill into the item, the debris from the cut item continues to extend and exit the hole. Some items are made of materials that are easy to break. When the screw is locked in, debris may be slowly removed and accumulated, causing the submerged head to break the item. Trace it to its cause and be: the diameter of head is larger than the diameter of hole, causes debris to accumulate and prop up hole wall.

In addition, it is known that some screws focus on the design of the screw thread for drilling at the end to increase the speed of cutting or drilling. There are also some screws that focus on the design of the chip removal grooves drilled at the end. However, the screw-locked article still cracks, and the hole still cannot accommodate debris, and the debris discharge rate is lower than the debris production capacity, causing the hole wall to be squeezed and cracked by debris.

Therefore, how to overcome the long-standing drawbacks of previous technologies has become The problem that needs to be solved urgently in this creation.

In view of this, the creator of this case provides a new screw, the main purpose of which is to use the drill blade structure and the flat drill tail anti-crack structure to effectively solve the long-standing drawbacks of the previous technology, and to ream, cut and expand the hole. The chip removal action achieves the effects of sinking the head into the hole lightly and smoothly, and preventing the cracking of objects.

In order to achieve the above object, the screw of the present invention includes: a head with a flange; a cylinder extending from the head, forming multiple turns of threads around the cylinder; a plurality of drill edges protruding from the surface of the head, the The drill edge extends from the flange to the cylinder; and, a flat drill portion includes: two planes formed on the front and back of the cylinder, intersecting each other on a virtual center line passing through the screw axis; two convex curved surfaces extending From the outer surface of the cylinder, each convex surface is adjacent to the same side of two planes to form an obtuse angle and a cutting edge. The distance between the two cutting edges is regarded as a width of the flat drill part, and the distance between the two planes is defined as the flat drill part. A thickness, the thickness is less than half of the width, and the width is less than the diameter of a screw thread; two slopes are on both sides of the flat drill portion, and one end of each slope is connected to the convex surface, and the other end is connected to the intersection. Gather with the plane to become a tip.

Wherein, the drill edge has an angle with the central line. Alternatively, the drill edge is parallel to the centerline. Alternatively, the drill edge is an outwardly protruding arc-shaped edge, or an inwardly recessed arc-shaped edge.

Then, with the necessary drawings, describe in detail the structure, function and purpose of this creation.

10: screw

11: Flange

12, 12b: head

13: Cylinder

14: screw teeth

15, 15a, 15b, 15c: drill edge

16: Angle

17, 18: Diameter

19: Centerline

20: flat drilling department

21: Plane

22: Convex surface

23: Bevel

24: tip

25: Thickness

26: width

27: blade

Figure 1 depicts the first embodiment of the screw of this creation.

Figure 2 shows the truncated flat drill section.

Fig. 3 depicts the partial composition of the second embodiment of the inventive screw.

Fig. 4 shows the partial composition of the third embodiment of the screw.

Fig. 5 depicts the partial composition of the fourth embodiment of the screw.

As shown in Figures 1 and 2, a first embodiment of a screw 10 is composed of a head 12, a cylinder 13 and a flat drill portion 20 designed as one. Wherein, the head 12 presents a cone, the larger diameter end of the cone extends a flange 11 , and the smaller diameter end connects to the cylinder 13 . Draw a virtual centerline 19 passing through the axis of the screw 10, surrounded by a plurality of drill edges 15 protruding from the surface of the head 12, each drill edge 15 extends from the bottom of the flange 11 to the cylinder 13, and is connected with the The center line 19 has an angle 16 so that the drill edge 15 is inclined.

Multiple turns of thread 14 are formed around the cylinder 13 , and each turn of thread 14 is integrally designed with the cylinder 13 , and the diameter 18 of the thread 14 is larger than the diameter 17 of the cylinder 13 .

The flat drill portion 20 is composed of two flat surfaces 21 , two convex curved surfaces 22 and two inclined surfaces 23 . Wherein, each of the planes 21 is formed on the front and back of the cylinder 13 and intersects each other at the center line 19 , so the planes 21 are also inclined. Each of the convex curved surfaces 22 extends from the outer surface of the cylinder 13 , and each convex curved surface 22 adjoins the same side of the two planes 21 , thereby forming an obtuse angle and an acute angle serving as the cutting edge 27 of the flat drill portion 20 . two blades 27 A distance apart is regarded as the width 26 of the flat drill portion 20, and another distance defined between two planes 21 is the thickness 25 of the flat drill portion 20, which is less than half of the width 26, and the width 26 is smaller than a thread 14 The diameter of 18 is still small. Two bevels 23 are on both sides of the flat drill portion 20, and one end of each bevel 23 is connected to the convex curved surface 22, and the other end is connected to the intersection and gathers with the plane 21 to form a tip 24, and the blade 27 follows the convex curved surface 22 The bevel 23 extends to a tip 24 .

When the screw 10 cuts a piece of wood (not shown), the flat drill part 20 cuts off the sawdust with the sharp blades 27 on both sides of the tip 24, allowing the cylinder 13 to drill into the wood with the integrally formed screw teeth 14, which can prevent splitting and Chips can be removed smoothly.

Secondly, the diameter of the head 12 increases from the cylinder 13 to the top of the screw 10, and the diameter of the hole is expanded with the drill 15, and the sawdust is cut off and discharged, so that the screw 10 can be easily drilled, and the head 12 is sunk into the hole. Countersunk effect, effectively preventing cracks and removing debris.

Fig. 3 depicts the second embodiment of the inventive screw 10, its structure is substantially the same as that of the first embodiment, the difference is that the drill edge 15a is parallel to the imaginary center line 19, so the drill edge 15a extends vertically.

Fig. 4 shows the third embodiment of the inventive screw 10, its structure is roughly the same as that of the second embodiment, the difference lies in: firstly, the head 12b is shaped like a trumpet.

Moreover, the drill edge 15b is an arc-shaped edge extending vertically and protruding outward.

FIG. 5 depicts a fourth embodiment of the inventive screw 10, which is substantially the same in structure as the second embodiment, the difference being that the drill edge 15c is an arc-shaped edge extending vertically and recessed inward.

The embodiments described above are only preferred embodiments for fully illustrating the utility model, and the protection scope of the utility model is not limited thereto. Transformation is all within the protection scope of the present utility model. The scope of protection of the utility model shall be determined by the claims.

10: screw

11: Flange

12: head

13: Cylinder

14: screw teeth

15: drill edge

16: Angle

17, 18: Diameter

19: Centerline

20: flat drilling department

21: Plane

22: Convex surface

23: Bevel

24: tip

Claims (5)

A screw head drill blade and a flat drill tail anti-crack structure, comprising: a head having a flange; a cylinder extends from the head, and a plurality of turns of threads are formed around the cylinder; a plurality of drill edges protruding from the head surface, the drill edges extending from the flange to the cylinder; and A flat drill section includes: Two planes are formed on the front and back of the cylinder, intersecting each other on a virtual center line passing through the axis of the screw; Two convex curved surfaces extend from the outer surface of the cylinder, and each convex curved surface is adjacent to the same side of the two planes to form an obtuse angle and a cutting edge. The spacing is a thickness of the flat drill portion which is less than half the width which is less than the diameter of one thread; Two slopes are on both sides of the flat drill portion, and one end of each slope is connected to the convex curved surface, and the other end is connected to the intersection to gather with the plane to form a point. The screw head drill blade and the flat drill tail anti-crack structure according to claim 1, wherein the drill blade has an angle with the center line. The screw head drill edge and flat drill tail anti-crack structure according to claim 1, wherein the drill edge is parallel to the center line. The screw head drill blade and flat drill tail anti-crack structure as described in claim 1, wherein, the The drill edge is a curved edge that protrudes outward. The screw head drill blade and the flat drill tail anti-crack structure according to Claim 1, wherein the drill blade is an arc-shaped blade concaved inward.

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