TWI550197B - Fastener - Google Patents

Description

fastener

The present invention relates to the design of a fastener, and more particularly to a fastener having reduced drag resistance and preventing cracking.

Referring to FIG. 1, the conventional screw 1 includes a rod body 11, a screw head 12 disposed at one end of the rod body 11, a tapered portion 13 formed at the end of the rod body 11, and a plurality of rings disposed on the rod body 11 The upper threaded portion 14; wherein the tapered portion 13 is tapered to form a drill tip 131, and the maximum outer diameter r2 of the tapered portion 131 is smaller than the outer diameter r1 of the threaded portion 14, and the threaded teeth 14 are formed therebetween. a chip evacuation groove 141, and the screw 14 spirally extends to the drill tip 131; when locked, the drill tip 131 is first pressed against the lock compound 2 by a tool (not shown) The screw head 12 is actuated to drive the screw 1 to be interlocked, so that the taper portion 13 is locked into the lock compound 2 in a progressive guiding manner, and the portion generated when the lock is engaged The chip is discharged outward from the chip evacuation groove 141, and a part of the chip is accumulated between the chip evacuation grooves 141, so that the screw 1 is locked, that is, the screw 1 is stably locked and positioned.

However, in actual use, it is known that the screw 1 can only be progressively extruded by the tapered portion 13 until the thread 14 enters the lock compound 2, and the screw 14 is screwed into the screw. Locking action, so in the process of locking Only the screw 14 is cut, and the tapered portion 13 is a pressing action, and the wood fiber cannot be effectively cut, causing the wood fiber to be wound to increase the locking torque, and the chip after cutting is not easy. The discharge through the chip evacuation groove 141 causes the chips to be easily accumulated in the lock compound 2. If the screw 1 continues to be twisted, excessive swarf may cause compression, and the lock compound 2 may be broken. In addition, it will also affect the speed of the lock, which needs to be improved.

Accordingly, it is an object of the present invention to provide a fastener which can prevent the occurrence of cracked material during the locking process and which reduces the locking torque to effectively increase the locking speed.

Therefore, the fastener of the present invention comprises a rod body, a screw head disposed at one end of the rod body, a conical portion opposite to the screw head and disposed at the other end of the rod body, and a plurality of spiral rings disposed on the rod body a first thread; wherein the tapered portion is tapered to form a drill tip, and the maximum outer diameter of the tapered portion is smaller than the outer diameter of the first thread, and a chip groove is formed between the first threads The tapered portion has a protruding unit smaller than the outer diameter of the tapered portion, respectively formed on the guiding groove on the side of the protruding unit, and a guiding groove is formed to meet the tapered portion a guiding blade at the same time, the first threading system extending to the end edge of the guiding edge to connect, the guiding groove is connected with the chip evacuating groove; so that when the locking is engaged, Under the auxiliary cutting of the leading edge, the chips generated during the drilling lock can be quickly discharged not only through the guiding groove and the chip discharging groove, but also can eliminate the accumulation of a large amount of chips during the screwing to avoid cracking during the locking. Material situation, more It is beneficial to greatly reduce the locking torque, effectively improve and accelerate the locking speed and other effects.

[Study 1]

1‧‧‧ screws

11‧‧‧ screw head

12‧‧‧ rod body

13‧‧‧spirt

14‧‧‧ thread

131‧‧‧ drill tip

141‧‧‧ swarf trench

2‧‧‧Lock compound

R1‧‧‧ thread diameter

R2‧‧‧ pointed cone outer diameter

〔this invention〕

3‧‧‧fasteners

31‧‧‧ rod body

32‧‧‧ screw head

33‧‧‧spirt

34‧‧‧First thread

35‧‧‧Second thread

311‧‧‧ first section

312‧‧‧Second section

313‧‧‧ fastening ribs

331‧‧‧ drill tip

332‧‧‧ protruding unit

333‧‧‧ guiding slot

334, 334'‧‧‧guide blade

335‧‧‧flat area

341‧‧‧ swarf trench

R1‧‧‧first screw outer diameter

R2‧‧‧ pointed cone outer diameter

a, a’‧‧‧ edge

4‧‧‧Lock compound

Figure 1 is a schematic view of a conventional screw.

Figure 2 is a schematic illustration of a first preferred embodiment of the present invention.

Fig. 3 is a schematic view showing the comparison between the tapered portion of the first comparative embodiment and the conventional tapered portion.

4 is a schematic view showing another embodiment of the thread according to the first preferred embodiment.

Figure 5 is a schematic view showing the locked state of the first preferred embodiment.

6 to 7 are schematic views of a second preferred embodiment of the present invention.

8 to 9 are schematic views showing another embodiment of the second preferred embodiment.

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, like elements are denoted by the same reference numerals.

Referring to FIG. 2, a first preferred embodiment of the fastener 3 of the present invention includes a rod 31, a screw head 32 disposed at one end of the rod body 31, and a screw head 32 opposite thereto and disposed on the rod body 31. a first taper 33 is disposed on the rod body 31, and a plurality of spiral teeth are formed on the rod body 31. The first thread 34 is formed with a chip evacuation groove 341. The setting form can be a general thread, also Or the setting of the umbrella type tooth, that is, as shown in FIG. 4, in the following description, the first screw 34 is provided with the umbrella tooth in FIG.

Continuing with the foregoing, the tapered portion 33 is tapered to form a drill point 331, and the shape and size of the tapered portion 33 are the same as those of the conventional tapered portion 13 (shown in FIG. 3), and the tapered portion 33 The maximum outer diameter R2 is smaller than the outer diameter R1 of the first screw 34, and the tapered portion 33 has a protruding unit 332 smaller than the outer diameter of the tapered portion 33, and is respectively formed on the side of the protruding unit 332. a slot 333, and a guiding edge 334 formed at the intersection of each of the guiding slots 333 and the tapered portion 33, please refer to FIG. 5, and the first thread 34 extends to the guiding edge 334. The end edge a is connected to the guide groove 333 to communicate with the chip evacuation groove 341. Of course, the arrangement of the guide blade 334 extends to the drill point 331 as an example.

Referring to FIG. 5, when the lock is engaged, the drill tip 331 of the tapered portion 33 is pressed against the lock compound 4, and a rotational torque can be applied to the screw head 32 to make the tightness. The firmware 1 is interlocked so that the drill tip 331 can enter the lock compound 4 during the interlocking process, while the guide edge 334 extending to the drill point 331 is guided by the drill tip 331 under the progressive guidance The auxiliary cutting of the drill lock is performed, and the entangled wood fiber is first cut to reduce the locking torque, and the chip generated during the auxiliary cutting process passes through the guiding groove 333. The guiding groove 333 can cooperate with the cutting blade 334 to guide the chips generated by the drill to the chip discharge groove 341 to be discharged outward, thereby not only avoiding the squeezing and squeezing of the sharp taper portion 33 by a large amount of chips. When the fastener 3 is continuously twisted and locked, it will not be pressed by excessive swarf, thereby causing the lock compound 4 The fact that the cracked material is missing causes the fastener 3 to be stably fixed in the lock compound 4, thereby effectively improving the positioning and the like in addition to avoiding a large amount of chip accumulation in the initial stage of the lock. Accelerate the lock rate and other effects.

Referring to FIG. 6, in the second preferred embodiment of the present invention, the fastener 3 still includes a member such as a rod body 31, a screw head 32, a tapered portion 33, and a first thread 34; in particular, the rod in this embodiment The body 31 is divided into a first section 311 adjacent to the screw head 32 and a second section 312 adjacent to the tip taper 33, and the second section 312 is just for the first thread 34 to be disposed. For the first section 311, the ring is provided with a plurality of fastening ribs 313, and the fastening ribs 313 are disposed in the inclined form of FIG. 6, or the fastening protrusions shown in FIG. The rib 313 is disposed in a tapered shape. Further, a flat portion 335 is formed between the tapered portion 33 and the first screw 34. The guiding edges 334 are also extended along with the flat portion 335. Further, in the embodiment, the rod body 31 is further provided with a spirally wound second thread 35, and the second thread 35 extends to the edge of the other guiding edge 334' The first and second screws 34 and 35 are arranged in a double spiral. Of course, the second screw 35 may be provided in the form of an umbrella tooth as shown in FIGS. 8 and 9 .

Therefore, by using the flat portion 335, the chips generated by the tapered portion 33 can be more smoothly guided into the chip evacuation groove 341, and at the same time assisted by the guiding edge 334. The cutting and the double spiral arrangement of the first screw 34 and the second screw 35 are used to facilitate the cutting and chip removal effect of the fastener 3 during the locking process. The effect of less chip accumulation and lowering the locking torque, and of course, the fastening ribs 313 can be used to gradually screw the first screw 34, and then the first screw 34 is spliced to perform the final chip. The clearing and squeezing make the lock more smooth, so as to improve the locking positioning effect.

In summary, the fastener of the present invention utilizes the protruding portion of the tapered portion having a smaller outer diameter than the outer diameter of the tapered portion, and is formed on the guiding groove on the side of the protruding unit, and is formed on each guiding groove and the guiding groove. a guiding edge at the junction of the tapered cones, so that the tapered portion can be locked into the lock compound under the auxiliary cutting of the guiding edge when the locking is engaged, and the cutting chips can be guided by the cutting The groove and the chip removal groove are quickly discharged, so as to avoid the accumulation of a large amount of chips during the screwing, avoiding the cracking of the material during the locking, and also greatly reducing the locking resistance, so as to improve the locking speed and the stable fixed position. Therefore, the object of the present invention can be 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.

3‧‧‧fasteners

31‧‧‧ rod body

32‧‧‧ screw head

33‧‧‧spirt

34‧‧‧First thread

331‧‧‧ drill tip

332‧‧‧ protruding unit

333‧‧‧ Guide groove

334‧‧‧guide blade

341‧‧‧ swarf trench

R1‧‧‧first screw outer diameter

R2‧‧‧ pointed cone outer diameter

A‧‧‧ edge

Claims (6)

A fastener comprising a rod body, a screw head disposed at one end of the rod body, a tip taper portion opposite to the screw head and disposed at the other end of the rod body, and a plurality of spiral rings disposed on the rod body a first thread; wherein the tapered portion is tapered to form a drill tip, and the maximum outer diameter of the tapered portion is smaller than the outer diameter of the first thread, and a chip groove is formed between the first threads; The protruding cone has a protruding unit smaller than the outer diameter of the tapered portion, and is formed on the guiding groove on the side of the protruding unit, and is formed on each guiding groove and the tapered portion. a guiding blade at the junction, and the first threading system extends to the end edge of the guiding blade to connect the guiding groove to the chip evacuation groove, so that the cutting chip can pass through the guiding groove The chip evacuation groove is quickly discharged. The fastener of claim 1, wherein the rod body is divided into a first section adjacent to the screw head, and a second section adjacent to the taper portion, and the second section is The segments are provided for the first thread, and the ring is provided with a plurality of fastening ribs on the first segment. According to the fastener of the first aspect of the patent application, a second screw threaded around the shaft is further disposed on the rod body, and the second thread extends to the end edge of the other guiding edge to make the edge The first and second threads are arranged in a double helix. The fastener of claim 1 or 3, wherein a flat zone is formed between the tapered portion and the first thread. The fastener of claim 1 or 3, wherein the thread is an umbrella tooth. The fastener of claim 1 or 3, wherein each of the guiding edges extends to the drill tip.