TWI797710B - Screw - Google Patents

Abstract

A screw mainly includes a chip guiding channel spirally defined on a conical surface of a head, and a plurality of cutting units formed beside the chip guiding channel. The chip guiding channel is formed in a position lower than the cutting units. During a drilling operation, cutting edges of cutting units serve to cut and sever fibers continuously in a spiral cutting manner to thereby reduce drilling torque and resistance efficiently. The chip guiding channel also facilitates the smooth removal of cut chips along a top face of the head, thereby allowing the head to fit level with a surface of a workpiece and increasing a fastening effect.

Description

screw

The present invention relates to a screw head, in particular to a screw that accelerates and improves the locking efficiency.

Referring to Fig. 1 and Fig. 2, the conventional screw 1 includes a screw head 11, a rod body 12 arranged on the screw head 11, and a plurality of screw threads 13 arranged on the rod body 12; wherein, the screw head 11 has a top surface 111, a conical surface 112 extending from the top surface 111 to the rod body 12, and a plurality of convex ribs 113 formed on the conical surface 112 at intervals, and the rod body 12 is connected with the The joints of the conical surfaces 112 extend outward; therefore, when locking, through the setting of the convex ribs at the conical surface 112, the fibers that have not been cut by the screw teeth 13 during locking are first processed. cutting, and then scrape off the fibers protruding from the periphery of the locking hole 21 on the locking object 2, so that the screw head 11 can form a tight fit with the locking object 2 after locking, effectively achieving Lock positioning effect.

However, after use, it was found that, in view of the elastic recovery characteristic of the fiber system of the locking object 2, the ribs 113 at intervals at the conical surface 112 of the known screw 1 cannot be effectively used during the locking process. Cutting off the fiber can only produce a rolling effect on the fiber, which will cause the screw head 11 to be entangled by the fiber to varying degrees, causing the locking torque of the screw 1 to increase continuously, while locking The swarf produced will also be affected by the entanglement of uncut fibers and cannot be discharged smoothly, but will be squeezed in the locking hole 21 and protrude from the periphery of the locking hole 21, causing the screw head 11 to sink. When it is on the locking part 2, it is impossible to effectively press the cuttings under the conical surface 112 of the screw head 11, resulting in too much cuttings in the locking part 2 and forming compression inside the locking part 2. Phenomenon, it is easy to cause the closure object 2 to have the loss of expanding and cracking material, so it needs to be improved.

Therefore, the purpose of the present invention is to provide a screw that can effectively cut the fibers wound on the screw head, and at the same time have enough space to provide chip removal and chip containment, effectively reduce the locking torque and resistance, and increase the locking Finally, the screw is buried in the flatness of the surface of the locking object, effectively achieving better fastening force effect.

Therefore, the screw of the present invention mainly has a recessed chip guide channel formed on the conical surface of the screw head, and a cutting portion provided on the conical surface by a helical ring, and the aforementioned cutting portion includes a plurality of chips provided on the chip guide. Cutting units next to the channel arranged in a helical order, when the cutting units are arranged in a helical order, the chip guide channel is surrounded by the cutting units in a helical state, and the cutting units are Protruding outward from both sides of the chip guide channel, so that the chip guide channel is formed at a position lower than the cutting units, while each cutting unit protrudes outward to form a cutting edge; therefore, through the screw The chip guide channel and cutting part on the head are designed so that the chips generated when the screw is locked on the locking object, and the fibers that cannot be effectively cut off when the screw thread is screwed will be subject to such cutting The cutting edge of the unit is cut and shredded in a continuous rotary cutting mode, which effectively reduces the risk of increased torque caused by the improper winding of the screw head by the fiber, and the chip guide channel can be used to guide and discharge chips, and provide part of the chips The indwelling fit will enable the screw to be locked and buried without excess chips and burrs protruding from the screw head, effectively increasing the flatness of the screw after locking and the fastening effect after locking .

The aforementioned and other technical contents, features and effects of the present invention will be clearly understood in the following detailed description of preferred embodiments with reference to the drawings.

Referring to Fig. 3 and Fig. 4, a preferred embodiment of the present invention, the screw 3 includes a screw head 31, a rod body 32 arranged on the screw head 31, and a plurality of helical rings arranged on the rod body 32. Screw thread 33; wherein, the other end of the rod body 32 opposite to the screw head 31 forms a locking portion 321, and the locking portion 321 can be set as a drill tail or a pointed tail according to different locking process requirements Such setting, and the following description is based on the pointed tail structure.

Continuing from the foregoing, the screw head 31 has a top surface 311, a conical portion 312 extending from the top surface 311 to the rod body 32 and having a conical surface 312A, and a direction from the periphery of the top surface 311 to the conical surface 312A. Extended extension portion 313, a recessed chip guide channel 314 formed on the conical surface 312A, and a cutting portion 315 provided on the conical surface 312A by a spiral ring; The cutting units 315A arranged in a helical order next to the chip channel 314, when the cutting units 315A are arranged in a helical order, the chip guide channel 314 is surrounded by the cutting units 315A to form a helical state , the cutting units 315A protrude outward from both sides of the chip guide channel 314, so that the chip guide channel 314 is formed at a position lower than the cutting units 315A, and each cutting unit 315A protrudes outward To form a cutting edge 315B, and each cutting unit 315A has a The first wall 315C, and a second wall 315D connected with the first wall 315C, and the cutting edge 315B is located at the junction of the first wall 315C and the second wall 315D, and the cutting units 315A It is continuously arranged on the conical surface 312A, and the cutting units 315A are arranged in the shape of a fin block; especially, in this embodiment, the extension portion 313 is formed with a plurality of cutting edges 313A spaced from each other, And a plurality of slots 313B opened on the extension portion 313, each slot 313B is surrounded by a first extension wall 313C and a second extension wall 313D, and the edge 313A is formed on the other side The junction of the first extension wall 313C of one slot 313B and the second extension wall 313D of the other slot 313B.

Referring to Fig. 3 and Fig. 6, when locking, the locking portion 321 of the screw 3 is in contact with a locking object 4, and a driving force is generated on the screw head 31 by a tool (not shown in the figure), so as to Make the thread 33 adjacent to the locking part 321 cooperate with the locking part 321 to form a locking hole 41 on the locking part 4, and gradually drive the thread 33 to screw in under the subsequent interlocking push. In the locking object 4, the fibers wound around the locking part 321 at the initial stage of locking are effectively cut through the screw teeth 33, and the rod body 32 is also driven along the locking hole under the continuous drive of the screw teeth 33. 41 and screwed into the locking object 4 until the screw head 31 is close to the locking hole 41, the screw head 31 continues to enter the locking object 4 under the linkage of the tool.

Continuing from the above, when the cutting units 315A contact the lock piece 4, they will produce continuous sharp rotary cutting on the lock piece 4 under the drive of the tool, that is, through the first wall 315C first produces a pushing action on the fiber to be wound on it, and then the cutting edge 315B continues to destructively cut the fiber, and at the same time, the chips formed after cutting will pass through the second wall 315D Connected to the chip guide channel 314, so that the cutting edges 315B are arranged in the form of a continuous spiral ring arranged on the conical surface 312A, so as to produce a continuous rotary cutting effect during continuous screwing, which can not only effectively Then the hole diameter of the locking hole 41 is quickly expanded, and at the same time, the cutting unit 315A can be lower than the cutting unit 315A by virtue of the chip guide channel 314 The location design can effectively provide enough space to accommodate the chips generated during the cutting process, and can be guided and discharged outward along the shape of the conical surface 312A arranged on the spiral ring, so as to prevent the locking hole 41 from being unable to bear the screw head 31 The outer diameter of the conical surface 312A gradually increases and there is a risk of material splitting due to the impact of extrusion. It can also effectively make the fibers be chopped and shredded, avoiding excessive winding of the fibers that will cause excessive locking processes for the next step. The risk of increased torsion and resistance is caused, and then by the arrangement of the slots 313B on the extension 313, the chips guided by the chip guide channel 314 can be discharged outwards through the slots 313B , to achieve the effect of fast chip removal, and the chip guide channel 314 can allow some chips to accumulate in it, so as to properly utilize the filling and blocking effect of part of the chips, so that the screw head 31 and the locking object 4 can be tightly closed Combined with the effect, it can effectively avoid the loss of cracked material due to the inability to accommodate the chips, and then through the matching arrangement of the slots 313B on the extension part 313, it is possible to protrude from the locking hole 41. When the screw head 31 sinks into the locking hole 41, the chips and chip burrs are pressed by the large area of the first extension wall 313C and properly resisted by the second extension wall 313D. In this way, the chip burr can be prevented from protruding from the screw head 31, and at the same time, the edge 313A also produces an embedded engagement with the wall surface of the locking hole 41 when the first extension wall 313C presses the chip. effect, so that after the screw 3 is screwed into the lock piece 4, the screw head 31 can produce a stable and tight locking effect with the lock piece 4; therefore, during the locking process, due to the The screw head 31 has the design of the slots 313B, the cutting portion 315 and the chip guide channel 314 at the same time, so that the fibers generated when locked on the locking object 4 can be peeled, chip guide, The wall surface embedded in the locking hole 41 produces a occlusal effect, and a series of locking process effects such as appropriately pressing the chips that want to protrude outward, so as to effectively maintain the screw head 31 buried in the locking object 4 after locking. The flatness of the surface greatly improves the fastening force and other effects of the screw 3 after locking.

To sum up the above, the screw of the present invention has a chip guide channel arranged in a spiral ring on the conical surface of the screw head, and a plurality of cutting units arranged next to the chip guide channel and arranged in a spiral order, so that the chip guide channel The setting is formed at a position lower than the cutting units, so when locking, not only can the uncut fibers be chopped and shredded in the rotary cutting mode by using the cutting units arranged in sequence, but also can In addition to effectively reducing the torque and resistance generated by locking, the chip guide channel can also properly provide a part for accumulation and chip removal, which can effectively produce a fastening effect with the locking object, and at the same time pass through the extension of the screw head The peripheral edge has a plurality of edges and grooves to press the chips that want to protrude outwards, and form a configuration of snapping action embedded in the locking object, so that the screw head can interact with the locking object stably The tight locking effect can effectively maintain the smoothness of the screw head buried on the surface of the locking object after locking, and greatly improve the fastening force after locking.

But the above is only to illustrate the preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, all the simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention , should still fall within the scope covered by the patent of the present invention.

(knowledge)

1: screw

11: screw head

12: rod body

13: screw teeth

111: top surface

112: conical surface

113: convex rib

2: Locking items

21: locking hole

(this invention)

3: screw

31: screw head

32: rod body

33: thread

311: top surface

312: conical part

312A: conical surface

313: Extension

314: chip guide channel

315: cutting part

321: locking part

313A: Edge

313B: slotting

313C: first extension wall

313D: second extension wall

315A: cutting unit

315B: cutting edge

315C: first wall

315D: Second Wall

4: Locking items

41: locking hole

Fig. 1 is a schematic diagram of a conventional screw.

FIG. 2 is an enlarged schematic view of the section A-A of FIG. 1 .

Fig. 3 is a schematic diagram of a preferred embodiment of the present invention.

Fig. 4 is an enlarged schematic view of partial components of the preferred embodiment.

Fig. 5 is a B-B end view of the preferred embodiment of Fig. 3 .

Fig. 6 is a schematic diagram of the locked state of the preferred embodiment.

3: screw 31: screw head 32: rod body 33: thread 311: top surface 312: Conical part 313: extension 314: chip guide channel 315: cutting part 321: locking part

Claims (6)

A kind of screw, it comprises a screw head, a rod body that is arranged on this screw head, and the screw thread that multiple helical rings are arranged on this rod body; Wherein, this screw head has a top surface, and one extends from this top surface To the conical portion of the rod body, the conical portion has a conical surface; it is characterized in that: The screw head has a chip guiding channel concavely formed on the conical surface, and a cutting part with a helical ring on the conical surface. The cutting units arranged in sequence, when the cutting units are arranged in a spiral order, the chip guide channel is surrounded by the cutting units to form a spiral state, and the cutting units are formed by the chip guide channel Two sides protrude outwards, so that the chip guide channel is formed at a position lower than the cutting units, and each cutting unit protrudes outwards to form a cutting edge. The screw according to claim 1, wherein the cutting units are in the shape of fin blocks. The screw according to claim 1, wherein the cutting units are arranged in a continuous connection. The screw according to claim 1, wherein an extension portion extends from the peripheral edge of the top surface toward the conical portion, and the extension portion is formed with a plurality of blade edges spaced apart from each other. According to the screw described in claim 4, wherein, the extension part is provided with a plurality of slots, each slot is surrounded by a first extension wall and a second extension wall, and the edge is formed At the junction of the first extension wall of one of the slots and the second extension wall of the other slot. The screw according to any one of claims 1 to 5, wherein each cutting unit has a first wall and a second wall connected to the first wall, and the cutting edge is located at the The junction of the first wall and the second wall.

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