TW201441493A - A screwing fastener - Google Patents

Abstract

A screwing fastener comprises a plurality of threads which are spirally disposed on a shank. Each thread includes at least three asymmetric cutting surfaces which respectively have a plurality of sawteeth. A cutting edge is disposed between any two adjacent cutting surfaces. Further, a groove having a capacity chamber is disposed on the shank. At least one thread is disposed between a drilling portion and the groove. Because the threads have a plurality of asymmetric cutting surfaces with a plurality of sawteeth, a friction between the threads and an object is reduced in cutting. Furthermore, the groove is utilized for cutting and accommodating the debris, thereby increasing the cutting effect. The debris, which is accommodated in the capacity chamber, not only effectively prevents the object from splitting but also reduces the screwing torsion and enhances the screwing speed.

Description

Locking fastener

The present invention relates to a screw design, and more particularly to a lock fastener.

Referring to FIG. 1 and FIG. 2, the conventional screw 1 includes a rod body 11, a screw head 12 disposed at one end of the rod body 11, a drill tap portion 13 disposed at the other end of the rod body 11, and a plurality of rings disposed on The screw 14 on the rod body 11; when locked, a rotating torque is applied to the screw head 12 by a tool (not shown) to drive the thread 14 under the drilling and tapping portion 13 The object 2 is cut and the rod 11 is screwed into the object 2 at the same time, so that the positioning effect of the screw 1 on the object 2 is achieved.

However, after actual use, it is found that the conventional screw 1 has the following defects, as follows:

1. In view of the fact that the threaded teeth 14 are disposed on the rod body 11 in a circular ring, the chips of the object 2 are not effectively cut off completely, and the fibers of the object 2 are more easily locked during the cutting process. Wrapped around the rod body 11, and the threaded teeth 14 are in close contact with the object 2, not only the cutting speed is slowed, but also the cutting resistance of the screw 1 is increased, and the locking process is required to be applied. Larger locking torque, which increases the inconvenience of use.

2. Continuing the above, since the screw teeth 14 have a circular design, the chips generated during cutting are easily accumulated in the threads 14 and cannot be smoothly discharged outward, thereby causing subsequent formation. The chips are squeezed and outwardly diffused, which makes the locking speed slower. Even if the object 2 can not be subjected to excessive torque, the cracking phenomenon occurs, so that the fast cutting effect can not be achieved, and the locking position of the screw 1 is affected.

3. Moreover, since the screw 1 is locked, if it is under the influence of external factors (ie, such as an earthquake), the screw 1 that is locked in the object 2 is automatically caused to retreat automatically. It is missing, so that only the screw 14 is in close contact with the object 2, and the lack of fastening force is easily generated.

In view of this, the creator of the case has also developed the design of the Taiwan Patent No. M415213 for the lack of the defect, that is, the fastener 3 having the low torque lock includes a rod 31, and the rod body 31 is disposed on the rod body 31. a screw head 32 at one end, a drill tapping portion 33 disposed at the other end of the rod body 31, and a plurality of spiral rings 34 disposed on the rod body 31 and extending to the drill tapping portion 33; wherein each The thread 34 is composed of three asymmetrical cutting faces 341, and the two adjacent cutting faces 341 are engaged with a cutting edge 342, and each of the cutting faces 341 is provided with a plurality of serrations 343; In time, by the asymmetry of the screw 34 having the plurality of serrations 343, when the screws 343 are locked to the cutting object 2, the mutual friction with the object 2 can be reduced, and the cutting efficiency can be increased. At the same time, there will not be a lot of scum accumulation. However, after use, it is found that there is still room for improvement. Therefore, the following creations are developed for the improvement.

Therefore, the object of the present invention is to provide a locking fastener which not only has the effects of accelerating chip evacuation, lifting the locking speed and reducing the locking torque during the locking and cutting process, but also effectively preventing the generation of cracked material.

Therefore, the lock fastener of the present invention comprises a rod body, a screw head and a drill tap portion disposed at two ends of the rod body, and a thread of a plurality of spiral rings disposed on the rod body; wherein each thread is provided And consisting of three asymmetric cutting faces, and the two adjacent cutting faces are connected with a cutting edge, and each of the cutting faces has a plurality of serrations; and the drilling and tapping portion is outwardly from the rod body Extending and forming a drill tip; as shown, the stem body has a tail slot extending to the drill tip so that the tail slot is not connected to the drill tip, and the drill tip At least one thread is disposed between the cutting groove, and the cutting groove has a cutting wall and a top wall connected to the cutting wall, and the cutting wall forms a cavity with the top wall Space is set; therefore, in the locking process, the cutting faces are designed to have the asymmetrical serrated thread design to reduce mutual friction between the threads and the object during cutting, and at the same time reduce the initial locking of the locking. In addition to the torsion force, the cutting cutting groove assists in cutting and accommodating the setting of the cutting chip, which not only can effectively prevent the cracking material, but also has the effects of greatly reducing the locking torque and achieving the lifting locking speed.

[study]

1‧‧‧ screws

11‧‧‧ rod body

12‧‧‧ screw head

13‧‧‧Drilling and attacking department

14‧‧‧ thread

2‧‧‧ objects

3‧‧‧Lock fasteners

31‧‧‧ rod body

32‧‧‧ screw head

33‧‧‧Drilling and attacking department

34‧‧‧ thread

341‧‧‧cutting surface

342‧‧‧ cutting edge

343‧‧‧Sawtooth

〔this invention〕

4‧‧‧Lock fasteners

41‧‧‧ rod body

42‧‧‧ screw head

43‧‧‧Drilling and attacking department

44‧‧‧ threaded teeth

45‧‧‧Tail slot

431‧‧‧ drill tip

441‧‧‧cutting surface

442‧‧‧ cutting edge

443‧‧‧Sawtooth

444‧‧‧ broken teeth

451‧‧‧ cutting wall

452‧‧‧Top wall

453‧‧‧ accommodating space

Figure 1 is a schematic view of a conventional screw.

Figure 2 is a schematic illustration of the conventional lock.

3 is a schematic view of a conventional fastener with two low torque locks.

Figure 4 is a schematic view of the conventional lock.

Figure 5 is a schematic illustration of a first preferred embodiment of the present invention.

Figure 6 is a schematic cross-sectional view of the preferred embodiment.

Figure 7 is a schematic illustration of a second preferred embodiment.

Figure 8 is a schematic view of a third preferred embodiment.

Figure 9 is a schematic view of a fourth preferred embodiment of the present invention.

Figure 10 is a schematic cross-sectional view of the preferred embodiment.

Figure 11 is a schematic view of a fifth preferred embodiment of the present invention.

The above and other technical contents, features, and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 5 and FIG. 6, a preferred embodiment of the present invention includes a rod body 41, a screw head 42 disposed at one end of the rod body 41, and a drill taping portion 43 disposed at the other end of the rod body 41, and a plurality of helical rings are disposed on the rod body 41 and extend to the thread 44 of the drilling and tapping portion 33; wherein each of the threaded teeth 44 is composed of at least three asymmetric cutting faces 441, and the two adjacent cutting faces The 441 is connected to a cutting edge 442, and each of the cutting surfaces 441 is provided with a plurality of saw teeth 443. Of course, the cutting surface 441 can be designed in an asymmetric manner of four or more according to requirements. In this embodiment, three asymmetric cutting faces are taken as an example, and the cutting edges 442 of any of the same positions can be connected to each other to form an imaginary line A, and the imaginary line A is arranged in parallel with the center B of the rod body. Or the imaginary line A is disposed at an oblique angle to the center B of the rod body (not shown). In this example, the imaginary line A is arranged in parallel with the center B of the rod body as an example; The portion 43 extends outward from the rod body 41 and is formed with a drill point 431; further, the rod body 41 is opened Cutting the tail groove 45, and the cutting tail groove 45 extends before the drill point 431, so that the cutting tail groove 45 is not in contact with the drill point 431, and at least the drill point 431 and the cutting tail groove 45 are between There is a thread 44. Of course, there may be two such teeth 44 between the drill point 431 and the cutting slot 45, or there may be three settings of the thread 44 (ie, the second and FIG. 8 and FIG. 8). In the third embodiment, the following description is made by taking FIG. 5 and FIG. 6 as an example, and the cutting groove 45 has a cutting wall 451 and A top wall 452 is connected to the cutting wall 451, and the cutting wall 451 and the top wall 452 are surrounded by an accommodating space 453.

Referring to FIG. 5 and FIG. 6, when the lock is engaged, the drill tapping portion 33 is abutted against the object 5, and a rotary torque is applied to the screw head 42 by a tool, so that the drill tapping portion 43 is driven to The thread 44 between the drill point 431 and the cutting groove 45 is cut into the object 5, and at this time, each of the cutting edges 442 of the thread 44 contacts the object 5, and the asymmetric design is timely matched. Each of the cutting faces 441 has a plurality of serrations 443 disposed thereon, so that the locking fasteners 4 can reduce mutual friction when the article 5 is initially cut, and can quickly cut and cut the cuttings wound on the cutting faces 441. In order to greatly eliminate the locking torque generated by the screw 44 during the initial drilling attack, the cutting groove 45 is opened on the rod body 41, and the cutting tail groove 45 is not connected to the drill point 431. The cutting arrangement is such that the cutting slot 45 can be cut into the object 5 in a progressive manner along the drill point 431, so as to effectively achieve labor saving, fast twist locking into the object 5, and use the cutting. The design of the accommodating space 453 formed by the wall 451 and the top sill wall 452 can be used for chip squeezing during drilling and attack. And preventing the cracking of the chip due to the chip pile extrusion, and at the same time, by the subsequent screw 44 having the asymmetric cutting surface 441 design, so as to continue the drilling lock after the tail groove 45 is engaged When the locking member 4 is locked, the locking fastening force can be effectively generated with the object 5, so as to prevent the locking fastener 4 from being automatically retracted due to external factors. Not only is it more effective in reducing the locking resistance and torque generation, but it is also more effective and effective in reducing the locking speed and other effects.

Referring to FIG. 9 and FIG. 10, a fourth preferred embodiment of the present invention, which is the same as the previous embodiment, still includes a rod body 41, a screw head 42, a drill tapping portion 43, a plurality of thread teeth 44 and a tail cutting end. a member such as a groove 45; it is particularly worth mentioning that in the present embodiment, the serration of each of the cutting faces 441 443, at least one or more teeth 444 are formed in the bottom of the thread 44, and the teeth 444 may be provided with two or more settings on each cutting surface 441 according to actual needs. (not shown), the following description is made by taking one of the cutting teeth 444 for each cutting surface 441 as an example to improve the chip evacuation space when the locking fastener 4 is drilled.

When the object 5 is drilled and tapped by the locking fastener 4, the cutting teeth 443 are driven by the cutting surfaces 441 to cut the chips wound on the cutting surfaces 441 first, so that the locking buckles are fastened. The piece 4 can be quickly screwed into the object 5, and at the same time, the tooth 444 opened on each cutting surface 441 is matched with the setting of the cutting groove 45, and the chip receiving and the direction generated by the drilling process is provided. The outer discharge is arranged so that the lock fastener 4 has a better chip removal effect, thereby also effectively reducing the locking torque, the resistance and the efficiency of improving the drilling and attacking.

Referring to FIG. 11, a fifth preferred embodiment of the present invention is still the same as that described in the first embodiment, and further includes a rod body 41, a screw head 42, a drill tapping portion 43, a plurality of thread teeth 44, and a tail cutting groove 45. In the present embodiment, at least one complete thread 44 is disposed between the drill point 431 and the cutting tail groove 45, and the complete thread 44 is driven by the drill point 431 when the lock is engaged. The drill lock is then matched with the cutting tail groove 45 to assist the cutting and chip receiving, which not only can effectively prevent the cracked material, but also has the effects of greatly reducing the locking torque and achieving the lifting locking speed.

In summary, the lock fastener of the present invention has a tail groove formed on the rod body, and the tail groove extends to the front of the drill point so that the tail groove is not connected to the drill tip. In the process of locking, the asymmetry of the cutting faces advantageously reduces the friction between the locking fastener and the object, not only reduces the contact area between the cutting process and the object, but also increases the locking torque to increase the twisting of the drilling attack. In addition to the speed, the cutting tail groove is used to assist the cutting and arranging the cutting chips to effectively prevent the lack of cracked material, and at the same time, the locking torque and the lifting locking speed can be effectively reduced, so The object of the invention is achieved.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the description of the invention. All should remain within the scope of the invention patent.

4‧‧‧Lock fasteners

41‧‧‧ rod body

42‧‧‧ rod body

43‧‧‧Drilling and attacking department

44‧‧‧ threaded teeth

45‧‧‧Tail slot

431‧‧‧ drill tip

441‧‧‧cutting surface

442‧‧‧ cutting edge

443‧‧‧Sawtooth

451‧‧‧ cutting wall

452‧‧‧Top wall

453‧‧‧ accommodating space

A‧‧‧ imaginary line

B‧‧‧ Rod Center

Claims (3)

A locking fastener comprises a rod body, a screw head disposed at one end of the rod body, a drilling and attacking portion disposed at the other end of the rod body, and a plurality of spiral rings disposed on the rod body and extending to the drill a thread of the tapping portion; wherein each of the threaded teeth comprises at least three asymmetric cutting faces, and the two adjacent cutting faces are coupled to a cutting edge, and each of the cutting faces is provided with a plurality of serrations, In addition, the drilling and tapping portion extends outward from the rod body and forms a drill point; and the rod body has a cutting groove formed on the rod body, and the cutting tail groove extends before the drill point to make the cutting tail The slot is not connected to the drill tip, and at least one thread is disposed between the drill tip and the tail slot, and the cutting tail groove has a cutting wall and a top wall connected to the cutting wall, and the The cutting wall and the top wall of the top wall form an accommodating space. The lock fastener according to claim 1, wherein at least one or more teeth are formed between the serrations of each of the cutting faces as deep as the root of the screw. The lock fastener according to claim 1, wherein at least one complete thread is provided between the drill tip and the tail groove.