TWI705201B - Drilling torque-reducing screw - Google Patents

Abstract

Drilling torque-reducing screw is characterized in that a shank is provided with a plurality of cutting threads, each of which has a plurality of slots formed thereon to provide a plurality of first cutting edges and second cutting edges. Meanwhile, a groove is recessed at a connection of the first cutting edge and the second cutting edge to provide two crests. Hence, the first and second cutting edges cooperate with the crests, thereby assisting in reaming quickly, increasing the whole cutting speed, breaking fibers of an object effectively, preventing the fibers from entangling around the screw, preventing the screwing operation from being hindered caused by the entanglement of the fibers, and reducing the drilling torque greatly. Further, the slots and grooves can accommodate debris properly, thereby attaining a tight engagement between the screw and the object, increasing the pulling capacity effectively, and enhancing the engaging stability of the screw.

Description

Screw with low twist lock torque

The present invention relates to a locking element, especially a screw with low twisting torque.

1, the conventional screw 1 includes a rod body 11, a screw head 12 provided at one end of the rod body 11, a locking portion 13 provided at the other end of the rod body 11 and opposite to the screw head 12, and A plurality of threads 14 arranged on the rod body 11 and extending toward the locking portion 13; wherein the locking portion 13 is gradually reduced to form a drill point 131; in use, the drill point 131 is first pressed against a lock On the surface of the object (not shown in the figure), and apply a rotating torsion to the screw head 12 to drill a hole on the lock compound through the drill point 131 in a progressive squeeze manner, and wait for the lock portion 13 After gradually screwing into the lock, the threads 14 continue with the lock portion 13 and then cut the lock, thereby linking the rod 11 to enter the lock with the cutting of the threads 14 , Then complete the screw 1 lock cooperation industry.

However, after actual use, it is found that when the screw 1 is locked on the lock, the drill point 131 can only be used to enter the lock in the initial locking stage until the lock 13 After entering the lock compound, the threads 14 can continue the lock portion 13 to perform the cutting operation of the lock compound. However, the threads 14 cannot effectively damage the fibers of the lock compound, making the fibers easy to entangle. On the screw 1, the torque of the screw lock is increased. At the same time, the chips generated by the subsequent locking are more likely to be blocked by the accumulated fibers and cannot be discharged out in time. As a result, the screw 1 cannot continue to be screwed in. The difficulty of locking. At this time, if the screw 1 continues to drill down to lock the lock, it is more likely to cause damage, dullness or breakage of the screw 1, or cause the lock to crack. Furthermore, the screw 1 cannot effectively engage with the lock compound, so that the screw 1 is prone to loosening. When the screw 1 is pulled or shaken by an external force, it is very easy to cause the screw 1 to loosen, shake or fall off. Therefore, the locking effect of the screw 1 is not obvious, which needs to be improved.

Therefore, the object of the present invention is to provide a screw with low twist and lock torque, which can effectively cut the fibers of the lock compound, helps to reduce the twist and lock torque and increase the cutting speed, and at the same time, to quickly remove chips, and to lock Then achieve better bite stability.

Therefore, the screw with low twist and lock torque of the present invention includes a rod body, a screw head and a locking part respectively provided at both ends of the rod body, and a plurality of cutting threads provided on the rod body; wherein, the Each cutting thread includes an upper tooth surface and a lower tooth surface extending outward from the rod body, and a plurality of notches and grooves at the junction of the upper tooth surface and the lower tooth surface, and each The groove has a plurality of first cutting edges, a plurality of second cutting edges connected to the first cutting edges, and the bottom of the tooth formed at the junction of the first cutting edge and the second cutting edge. Both ends of the slot are respectively formed with upper and lower ridges; therefore, the first cutting edge and the second cutting edge cooperate with the upper and lower ridges to rapidly expand the hole in the initial stage of locking, and at the same time The fiber of the lock compound is effectively cut to facilitate the entry of the screw lock, which not only effectively increases the cutting speed, but also avoids the occurrence of the fiber being entangled in the rod body, and greatly reduces the twisting force of the lock. The generated chips can be discharged along the cutting screws to achieve rapid chip removal, and to avoid excessive accumulation of the chips and cause the cracking of the lock compound. Moreover, the cutting and grooving are not only It can accommodate the chips that are too late to be discharged. At the same time, some chips are accumulated in the grooves and the grooves after the locking, which is more helpful to improve the firm engagement between the screw and the locking compound, and not only effectively increases the drawing Outside the force, the occlusal stability of the screw is improved.

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

Referring to FIG. 2, a preferred embodiment of the present invention, the screw 3 with low twist lock includes a rod 31, a screw head 32 provided at one end of the rod 31, and a screw head 32 provided at the rod 31 The other end is opposite to the locking portion 33 of the screw head 32, and a plurality of cutting threads 34 arranged on the rod 31 and extending toward the locking portion 33; wherein the locking portion 33 is gradually reduced to form a drill Point 331, and the locking portion 33 is tapered and meets after the drill point 331. The angle A1 formed by extending outward is preferably 22~26 degrees. In this embodiment, the rod 31 is additionally provided A plurality of auxiliary threads 35, and the auxiliary threads 35 are arranged in a complete tooth form, the aforementioned auxiliary threads 35 are preferably arranged adjacent to the screw head 32, and the cutting threads 34 are arranged It is arranged in a wavy state, as shown in FIG. 4, and the cutting threads 34 are preferably arranged adjacent to the locking portion 33, and the outer diameter 34d of the cutting threads 34 is smaller than that of the auxiliary threads. The outer diameter of the tooth 35 is 35d.

2 and 3, each of the cutting threads 34 includes an upper tooth surface 341 extending downward from the rod body 31, a lower tooth surface 342 extending upward from the rod body 31, and a plurality of the upper teeth The groove 343 where the surface 341 meets the lower tooth surface 342, and a plurality of grooves 344 recessed at the joint of the upper tooth surface 341 and the lower tooth surface 342, and the center of the groove 344 extends horizontally outward A reference line R1 is defined. In this embodiment, the inclination angle A2 formed by the extension of the upper tooth surface 341 intersecting the reference line R1 and the inclination angle formed by the extension of the lower tooth surface 342 intersecting the reference line R1 A3 is different, the inclination angle A2 is preferably 10 degrees, and the inclination angle A3 is preferably 30 degrees.

Referring to Figures 3 and 4, each cut 343 has a plurality of first cut edges 3431 intersecting the upper tooth surface 341 and the lower tooth surface 342 respectively, and a plurality of second cut edges intersecting the first cutting edges 3431 The blade 3432, and the tooth bottom 3433 formed at the junction of the first cutting edge 3431 and the second cutting edge 3432, refer to Fig. 5, the first cutting edge 3431 extends outward and the second cutting edge 3432 outward The intersection of the extension and intersection extends outward to define a centerline R2, and the inclination angle A4 formed by the intersection of the first cutting edge 3431 and the centerline R2 and the inclination formed by the intersection of the second cutting edge 3432 and the centerline R2 The angle A5 is set differently, the inclination angle A4 is preferably 60 degrees, and the inclination angle A5 is preferably 30 degrees, and each slot 344 is opened at the junction of the upper tooth surface 341 and the lower tooth surface 342 And are located at a position different from the positions of the cut grooves 343, that is, the upper tooth surface 341 and the lower tooth surface 342 intersect at both ends of the groove 344 respectively to form an extension The upper tooth crest 3411 and the lower tooth crest 3421 are between the first cutting edge 3431 of the slot 343 and the second cutting edge 3432 of another adjacent slot 343, so that each slot 344 is opened in any two adjacent slots. Between the cut grooves 343, the cut grooves 343 and the cut grooves 344 are arranged alternately, and the first cutting edges 3431 and the second cutting edges 3432 are different from the upper tooth crests 3411 and the lower tooth crests 3421 At the same time, the upper tooth surface 341 extends outward from the rod body 31 and extends to the same extension distance of the upper tooth crests 3411. The lower tooth surface 342 extends outward from the rod body 31 and extends to the lower teeth The extension distances of the peaks 3421 are the same as each other.

2 to 6, when performing the locking operation, the user first presses the drill point 331 against the surface of a lock compound 4, and applies a rotating torque to the screw 32 to make the The drill tip 331 is driven by the rotational torque to tap the lock compound 4. At this time, the first cutting edges 3431 and the second cutting edges 3432 are used to cooperate with the upper tooth crests 3411 and the lower tooth crests 3421 to perform rotary cutting. , It not only effectively performs rapid reaming of the lock compound 4 to improve the overall cutting speed, but also performs multi-angle rotary cutting inside the lock compound 4, and effectively destroys the fibers of the lock compound 4, thereby effectively avoiding The fiber is wound around the locking portion 33 and the rod body 31, which greatly reduces the twisting force of the twist lock, and the chips generated during the locking process can be discharged outward along the cutting screws 34, which achieves rapid chip removal. Effectiveness, and to prevent the locking process from being hindered by the cutting chips, or causing the material to crack in the lock compound. Furthermore, some of the cutting chips are accumulated in the grooves 343 and 344 after the locking Between the cutting screws 34, it is more helpful to increase the pulling force and increase the occlusal stability of the screw 3 screwing.

Referring to Figures 7 to 9, the second preferred embodiment of the present invention still includes the components described in the previous embodiment, and this embodiment is particularly in that the slots 344 are opened inwardly and extend to the bottom of the tooth 3433, so that any two slots 344 are connected to each other. Therefore, these enlarged openings The groove 344 is not only conducive to chip guide and rapid chip removal, but also allows more chips to be contained therein, so that the screw 3 and the locking compound 4 can achieve a tighter engagement, thereby increasing the pulling force and increasing the screw 3. Bite stability of screw in.

In summary, the screw with low twist and lock torque of the present invention is provided with the notches and grooves at the junction of the upper tooth surface and the lower tooth surface to form the first cutting edge and second cutting edge. Therefore, not only can the first cutting edge and the second cutting edge cooperate with the upper and lower tooth peaks to rapidly expand the hole, and increase the overall cutting speed, at the same time Effectively cut the fibers of the lock compound to reduce the twisting force of the twist lock, and then cooperate with the grooves and the grooves to appropriately accommodate and depress part of the chips, which further enhances the pulling force and improves the bite stability after screwing degree.

However, the above is only to illustrate the preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention, that is, simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the description of the invention , Should still fall within the scope of the invention patent.

(Acquaintance)

1: screw

11: Rod body

12: Screw head

13: Locking part

14: Thread

131: Drill Point

(this invention)

3: Screw with low twist lock torque

31: Rod body

32: Screw head

33: lock part

34: Cutting thread

35: auxiliary thread

331: Drill Point

341: upper tooth surface

342: lower tooth surface

343: grooving

344: slot

3411: Upper tooth peak

3421: lower tooth peak

3431: first cutting edge

3432: second cutting edge

3433: tooth bottom

A1: The angle formed by the intersection of the lock

A2: The angle formed by the upper tooth surface and the reference line

A3: The angle formed by the lower tooth surface and the reference line

A4: The inclination angle of the first cutting edge

A5: The inclination angle of the second cutting edge

34d: The outer diameter of the cutting screw

35d: Outer diameter of auxiliary screw

R1: Baseline

R2: Centerline

4: lock compound

Figure 1 is a schematic diagram of a conventional screw. Figure 2 is a perspective view of the first preferred embodiment of the present invention. Figure 3 is an enlarged view of a partial component of the first preferred embodiment. Figure 4 is another perspective view of the first preferred embodiment. Fig. 5 is a schematic cross-sectional view taken along line S-S in Fig. 2. Fig. 6 is a schematic diagram of the locked state of the first preferred embodiment. Fig. 7 is a perspective view of a second preferred embodiment of the present invention. Fig. 8 is an enlarged view of partial components of the second preferred embodiment. Fig. 9 is a schematic cross-sectional view taken along line S-S in Fig. 7.

3: Screw with low twist lock torque

31: Rod body

32: Screw head

33: lock part

34: Cutting thread

35: auxiliary thread

331: Drill Point

A1: The angle formed by the intersection of the lock

A2: The angle formed by the upper tooth surface and the reference line

A3: The angle formed by the lower tooth surface and the reference line

34d: The outer diameter of the cutting screw

35d: Outer diameter of auxiliary screw

R1: Baseline

Claims (5)

A screw with low twist lock torque, comprising a rod body, a screw head provided at one end of the rod body, a locking part opposite to the screw head and provided at the other end of the rod body, and a plurality of screws provided on the rod The cutting thread on the rod and extending toward the locking portion; wherein the locking portion is tapered to form a drill point; characterized in that: each cutting thread includes an upper thread extending downward from the rod Surface, a lower tooth surface extending upward from the rod body, a plurality of notches formed at the joint of the upper tooth surface and the lower tooth surface, and a plurality of recesses at the joint of the upper tooth surface and the lower tooth surface It is located at a slot that is different from the location of the slots; wherein each slot has a plurality of first cutting edges that intersect the upper tooth surface and the lower tooth surface respectively, and the plural numbers are connected to the first cutting edges The second cutting edge and the bottom of the tooth formed at the junction of the first cutting edge and the second cutting edge, and the slotting defines a datum line, and the upper tooth surface and the lower tooth surface intersect at the The two ends of each slot are formed with an upper tooth crest and a lower tooth crest respectively. Each upper tooth crest and each lower tooth crest extend from the first cutting edge of the groove to the other Between the second cutting edges of adjacent slits, each slit is opened between any two adjacent slits so that the slits and the slits are arranged in a staggered manner, so that the first The cutting edge and the second cutting edge are different from the upper tooth crests and the lower tooth crests. At the same time, the upper tooth surface extends from the rod body and extends to the same extension distance of the upper tooth crests. The rod body extends outward and extends to the same extension distance of the lower tooth crests, and the grooves are opened inward and extend to the tooth bottom, so that any two grooves are connected to each other. According to the screw with low twist lock torque described in item 1 of the scope of patent application, the cutting threads are arranged in a waved state. According to the screw with low twist lock torque described in item 1 of the scope of patent application, the first cutting edge and the second cutting edge are arranged at different inclination angles. According to the first item of the scope of patent application, the screw with low twist-locking torque, wherein the inclination angle formed by the outward extension of the upper tooth surface intersecting the reference line and the inclination angle formed by the extension outward extension of the lower tooth surface intersecting the reference line different. According to the first item of the scope of patent application, the screw with low twist and lock torque, wherein the rod body is additionally provided with a plurality of auxiliary threads, and the auxiliary threads are arranged in a complete tooth form.

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