Screw

Abstract

The invention discloses a screw, which is mainly characterized in that a plurality of convex ribs are arranged on a rod body, a chip removal part is arranged between any two adjacent convex ribs, the chip removal part is provided with two inclined surfaces respectively connected with the plurality of convex ribs and a containing groove connected with the plurality of inclined surfaces, and a plurality of rotary cutting parts are arranged on threads of the screw. The two tooth surfaces of each thread are connected to a tooth peak, different vertical distances are formed between the tooth bottoms of the two tooth surfaces and a reference line defined by the tooth peak, meanwhile, one tooth surface is further provided with two tooth sections arranged at different inclination angles, the multiple threads are asymmetrically arranged, and through rotary cutting of the multiple rotary cutting parts and the multiple convex ribs, the multiple rotary cutting parts and the multiple convex ribs are combined in a rotary cutting mode. Therefore, the cutting effect is greatly improved by matching with the asymmetrically arranged screw teeth, the locking resistance is further reduced, the drawing resistance is improved, the screw is prevented from being easily pulled out, generated cuttings can be guided into the containing groove by the inclined surfaces, and rapid chip removal is facilitated.

Description

Technical Field

[0001] The present invention relates to a screw structure, and particularly to a screw that improves cutting ability, achieves rapid chip evacuation, and achieves tight engagement, thereby reducing locking resistance, improving locking effect, and increasing anti-pulling force. Background Art

[0002] Referring to Figure 1 and Figure 2 As shown, the existing screw 1 includes a rod body 11, and opposite ends of the rod body 11 form a first end and a second end, a head 12 formed at the first end, a tail 13 formed at the second end, and a plurality of threads 14 spirally arranged on the rod body 11. Among them, each thread 14 has an upper tooth surface 141 extending outward from the rod body 11 and facing the head 12, a lower tooth surface 142 extending outward from the rod body 11 and facing the tail 13, and a tooth peak 143 formed at the junction of the upper and lower tooth surfaces 141 and 142. When performing a locking operation, first, the tail 13 is abutted and positioned on the surface of an object 2, and then a rotational torque is applied to the head 12 to drill and expand a hole through the tail 13, and then cooperate with the rotation of the plurality of threads 14 to gradually drive the screw 1 to be screwed into the object 2, so that the locking operation of the screw 1 can be completed.

[0003] However, it is found that after actual use, the existing screw 1 provides insufficient chip accommodation and evacuation space, resulting in the chips generated during the locking process not being able to be discharged outward in time, causing the screw 1 to continuously squeeze the plurality of chips and easily increasing the locking resistance and reducing the locking speed. If the plurality of chips are continuously squeezed, it is more likely to cause the object 2 to crack. In addition, insufficient chip accommodation space will also cause poor bite force and locking performance after the screw 1 is locked, resulting in poor anti-pulling force of the screw 1, making the screw 1 easily loosen from the object 2. Moreover, the plurality of threads 14 are symmetrically arranged, that is, the plurality of upper and lower tooth surfaces 141 and 142 are symmetric tooth surfaces and have symmetric angles, which further limits the cutting ability of the plurality of threads 14. It is difficult to effectively and quickly screw the screw 1 into the object 2 only by rotating the plurality of threads 14 to cut the object 2, and there is indeed room for improvement. Summary of the Invention

[0004] Therefore, an object of the present invention is to provide a screw that can greatly improve the cutting ability, achieve tight engagement, and at the same time has sufficient space for chip accommodation and evacuation, thereby reducing the locking resistance, increasing the locking speed, and increasing the anti-pulling force.

[0005] Thus, the screw of the present invention includes a rod body, a head and a tail respectively located at both ends of the rod body, a plurality of screw threads spirally provided on the rod body, a plurality of ribs extending between the plurality of screw threads and protruding from the rod body, and a chip discharging portion formed between any two adjacent ribs. Wherein, each of the screw threads has a first tooth surface and a second tooth surface respectively protruding outward from the rod body and facing opposite directions, and the first and second tooth surfaces gradually taper outward and converge at a tooth peak. The tooth peak defines a baseline perpendicular to the center line of the rod body, and a first tooth bottom and a second tooth bottom are respectively formed at the joints of the first and second tooth surfaces and the rod body. The vertical distances formed between the first and second tooth bottoms and the baseline are different. In addition, the first tooth surface has a first tooth segment connecting the first tooth bottom and a second tooth segment connecting the first tooth segment. The angles formed between the first and second tooth segments and the baseline are different. In addition, a plurality of cutting portions are formed on the tooth peaks of at least two screw threads, and the chip discharging portion has a receiving groove extending between the plurality of screw threads and two inclined surfaces respectively connecting the receiving groove and the plurality of ribs. Therefore, through the assistance of the plurality of ribs and the plurality of cutting portions for rotary cutting, in addition to improving the cutting ability, the chips generated by the aforementioned rotary cutting can be guided by the plurality of inclined surfaces and enter the receiving groove, which is more conducive to rapid chip discharge, thereby reducing the generation of locking resistance, increasing the locking speed, and avoiding cracking of the object. And part of the chips can also be accommodated in the plurality of inclined surfaces, the receiving groove and the plurality of cutting portions after locking, thereby increasing the biting force and locking property after locking. In addition, different vertical distances are formed between each of the first and second tooth bottoms and the baseline, and different angles are formed between each of the first and second tooth segments and the baseline, so that the plurality of screw threads are asymmetrically arranged, which can also improve the cutting effect, achieve a tight bite after locking, and increase the anti-pulling force after locking, so as to prevent the screw from being easily pulled out. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a schematic view of an existing screw.

[0007] Figure 2 is a schematic view of the use state of an existing screw.

[0008] Figure 3 is a perspective view of the first preferred embodiment of the present invention.

[0009] Figure 3A is Figure 3 an enlarged view of A in

[0010] Figure 3B is Figure 3 an enlarged view of B in

[0011] Figure 4 is a schematic view of partial components of the first preferred embodiment.

[0012] Figure 5It is a partial component sectional view of the first preferred embodiment.

[0013] Figure 6 It is a schematic diagram of the first preferred embodiment.

[0014] Figure 6A It is Figure 6 An enlarged view of C in

[0015] Figure 6B It is Figure 6 An enlarged view of D in

[0016] Figure 7 It is a schematic diagram of the usage state of the first preferred embodiment.

[0017] Figure 8 It is a three-dimensional view of the second preferred embodiment of the present invention.

[0018] Figure 9 It is a schematic diagram of the second preferred embodiment.

[0019] Figure 9A It is Figure 9 An enlarged view of E in

[0020] Figure 10 It is a schematic diagram of the usage state of the second preferred embodiment.

[0021] (Prior art)

[0022] 1: Screw

[0023] 11: Rod body

[0024] 12: Head

[0025] 13: Tail

[0026] 14: Thread

[0027] 141: Upper tooth surface

[0028] 142: Lower tooth surface

[0029] 143: Tooth peak

[0030] 2: Object (the present invention)

[0031] 3: Screw

[0032] 31: Rod body

[0033] 32: Head

[0034] 33: Tail

[0035] 34: Thread

[0036] 34A: First thread

[0037] 34B: Second thread

[0038] 35: Rib

[0039] 36: Chip removal part

[0040] 37: Rotary cutting part

[0041] 331: Drill body

[0042] 332: Guide groove

[0043] 341, 341A, 341B: First tooth surface

[0044] 342, 342A, 342B: Second tooth surface

[0045] 343, 343A, 343B: Tooth crest

[0046] 344, 344A, 344B: First tooth root

[0047] 345, 345A, 345B: Second tooth root

[0048] 361: Receiving groove

[0049] 362: Inclined plane

[0050] 371: Groove

[0051] 372: Cutting groove

[0052] 373: Cutting tooth edge

[0053] 3411, 3411A, 3411B: First tooth segment

[0054] 3412, 3412A, 3412B: Second tooth segment

[0055] θ1: First angle

[0056] θ2: Second angle

[0057] θ3: Third angle

[0058] θ4: Fourth angle

[0059] θ5: Fifth angle

[0060] θ6: Sixth angle

[0061] D1: First vertical distance

[0062] D2: Second vertical distance

[0063] D3: Third vertical distance

[0064] D4: Fourth vertical distance

[0065] D5: The fifth vertical distance

[0066] D6: The sixth vertical distance

[0067] L: Center line

[0068] R: Baseline

[0069] 4: Object Detailed implementation manners

[0070] Regarding the foregoing and other technical contents, features and effects of the present invention, they will be clearly understood in the following detailed description of the preferred embodiments with reference to the drawings.

[0071] Refer to Figure 3 , Figure 3A , Figure 3B and Figure 4 As shown in [[ID=]], [[ID=]], [[ID=]] and [[ID=]], in the first preferred embodiment of the present invention, the screw 3 includes a rod body 31 defining a center line L, a first end and a second end respectively formed at opposite ends of the rod body 31, a head 32 formed at the first end of the rod body 31, a tail 33 formed at the second end of the rod body 31, a plurality of screw teeth 34 spirally wound around the rod body 31, and a plurality of ribs 35 protruding outward from the outer peripheral edge of the rod body 31. The plurality of ribs 35 extend between the plurality of screw teeth 34 in a direction non-parallel to the center line L of the rod body 31. In addition, a chip discharging portion 36 is formed between any two adjacent ribs 35. In this embodiment, four ribs 35 are provided on the rod body 31, and the plurality of ribs 35 are symmetrically arranged. In addition, the tail 33 is in a pointed tail shape in this embodiment, and it can be adjusted and changed according to actual use requirements, such as different shapes like pointed tail and drill tail.

[0072] Continuing the foregoing, each screw tooth 34 has a first tooth surface 341 extending outward from the rod body 31, a second tooth surface 342 extending outward from the rod body 31 and facing in the opposite direction to the first tooth surface 341, and a tooth peak 343 formed at the junction of the first tooth surface 341 and the second tooth surface 342. The first tooth surface 341 is connected to the outer peripheral edge of the rod body 31 at a first tooth bottom 344, and the second tooth surface 342 is connected to the outer peripheral edge of the rod body 31 at a second tooth bottom 345. Referring to [[ID=]], [[ID=]] and [[ID=]] in conjunction, Figure 6 , Figure 6A and Figure 6BAs shown, the crest 343 of the tooth defines a baseline R perpendicular to the center line L of the rod 31. Additionally, multiple cutting portions 37 are provided at intervals on the crests 343 of at least two threads 34. The vertical distance formed between the first tooth bottom 344 of each first tooth surface 341 and the baseline R of the crest 343 is different from the vertical distance formed between the second tooth bottom 345 of each second tooth surface 342 and the baseline R. Among them, each first tooth surface 341 has a first tooth segment 3411 connected to the first tooth bottom 344, and a second tooth segment 3412 connected to the first tooth segment 3411. The angle formed between each first tooth segment 3411 and the baseline R of the crest 343 is different from the angle formed between each second tooth segment 3412 and the baseline R of the crest 343.

[0073] Referring to Figure 3 and Figure 4 As shown, in this embodiment, multiple threads 34 are divided into multiple first threads 34A and multiple second threads 34B provided between the multiple first threads 34A as an example, such that the screw 3 is arranged in a double-thread pattern. Among them, the first tooth surface 341A of each first thread 34A faces the head 32 direction, and the second tooth surface 342A of each first thread 34A faces the tail 33 direction. In cooperation with referring to Figure 6 and Figure 6A As shown for the first thread 34A, a reference line parallel to the center line L is defined between the first tooth bottom 344A of each first tooth surface 341A and the baseline R, and the length of this reference line is defined as a first vertical distance D1 in this embodiment. Another reference line parallel to the center line L is also defined between the second tooth bottom 345A of each second tooth surface 342A and the baseline R, and the length of this reference line is defined as a second vertical distance D2 in this embodiment. Preferably, the first vertical distance D1 is greater than the second vertical distance D2. The definitions of the following other third, fourth, fifth, and sixth vertical distances D3, D4, D5, and D6 also originate from the lengths of the reference lines parallel to the center line L as described above and will not be elaborated further. Additionally, the first tooth surface 341A of each first thread 34A has a first tooth segment 3411A connected to the first tooth bottom 344A, and a second tooth segment 3412A connected to the first tooth segment 3411A and the crest 343A. And a first angle θ1 is formed between each first tooth segment 3411A and the baseline R, and a second angle θ2 is formed between each second tooth segment 3412A and the baseline R. Preferably, the first angle θ1 is greater than the second angle θ2.

[0074] Continuing the above, referring to Figure 6 and Figure 6BThe second thread 34B shown, the first flank 341B of each of the second threads 34B faces the direction of the tail portion 33, the second flank 342B of each of the second threads 34B faces the direction of the head portion 32, and in this embodiment, a third vertical distance D3 is formed between the first root 344B of each of the first flanks 341B and the baseline R. At the same time, a fourth vertical distance D4 is formed between the second root 345B of each of the second flanks 342B and the baseline R. The third vertical distance D3 can be greater than the fourth vertical distance D4. Additionally, the first flank 341B of each of the second threads 34B has a first thread segment 3411B connecting the first root 344B, and a second thread segment 3412B connecting the first thread segment 3411B and the thread crest 343B. And a third angle θ3 is formed between each of the first thread segments 3411B and the baseline R, a fourth angle θ4 is formed between each of the second thread segments 3412B and the baseline R, and the third angle θ3 can be greater than the fourth angle θ4.

[0075] Accordingly, by utilizing the differences in the multiple vertical distances D1, D2, D3, D4, the multiple first threads 34A and the multiple second threads 34B can have asymmetrical flanks. At the same time, due to the differences in the multiple angles θ1, θ2, θ3, θ4, the first flanks 341A, 341B of the multiple first threads 34A and the multiple second threads 34B form a multi-segment structural pattern, that is, asymmetrical thread segments are generated. Therefore, the above multiple conditions are more conducive to enhancing the cutting ability of the multiple threads 34 (i.e., the multiple first threads 34A and the multiple second threads 34B), achieving a tight bite, and increasing the tensile pull-out force after the screw 3 is locked, so as to prevent the screw 3 from being easily pulled out from an object 4 ( Figure 7 ).

[0076] Refer to Figure 3 、 Figure 3A and Figure 4As shown, each chip removal portion 36 has a receiving groove 361 extending between a plurality of the threads 34, and two inclined surfaces 362 respectively located on both sides of the receiving groove 361, such that the plurality of inclined surfaces 362 are respectively connected to the receiving groove 361, and at the same time, the other sides of the plurality of inclined surfaces 362 are respectively connected to the two adjacent ribs 35. So when the plurality of ribs 35 perform rotary cutting to generate chips, the plurality of inclined surfaces 362 can guide the aforesaid chips into the receiving groove 361, and then quickly discharge the plurality of chips outwards. In this embodiment, each rotary cutting portion 37 has at least one groove 371, and a plurality of cutting grooves 372 formed on both sides of each groove 371, and each groove 371 is recessed inward from the tooth crest 343, so that two cutting edges 373 are formed on both sides of each groove 371. Additionally, the groove 371 is preferably arranged in an arc shape. In this embodiment, the plurality of cutting grooves 372 are arranged in pairs, and each groove 371 is exactly located between any two groups of cutting grooves 372 and is connected to the plurality of cutting grooves 372 to form a plurality of cutting edges 373.

[0077] Referring to Figures 3 to 7As shown, when the screw 3 is locked, first, the tail 33 is abutted and positioned on the surface of an object 4. Then, a rotational torque is applied to the head 32 to drive the tail 33 to drill downward into the object 4. Then, the object 4 is cut by a plurality of the screw threads 34 (i.e., a plurality of the first and second screw threads 34A, 34B). At this time, through the grooves 371, cutting grooves 372 and cutting teeth 373 of a plurality of the cutting portions 37, and a plurality of the ribs 35 are formed on the rod body 31, so as to achieve an auxiliary cutting effect and improve the cutting ability. When the plurality of the ribs 35 cut the object 4 to generate chips, the generated chips can be guided by a plurality of the inclined surfaces 362 located on both sides of the plurality of the ribs 35 and enter the accommodation groove 361, and then quickly discharged outward. In addition, the chips generated by cutting can also move quickly outward through the accommodation groove 361, and through a plurality of the cutting grooves 372 and a plurality of the grooves 371. Therefore, the configurations of the plurality of the inclined surfaces 362, the accommodation groove 361, the cutting grooves 372 and the grooves 371 can effectively increase the chip discharge and chip accommodation space, which is more conducive to quickly discharging the plurality of the chips outward. In this way, not only the generation of the locking resistance is greatly reduced, but also the screw 3 will not be obstructed by the plurality of the chips during the screwing process and can be quickly screwed into the object 4, which further improves the locking speed. At the same time, it is also possible to avoid the situation that the plurality of the chips are accumulated and squeezed to cause the object 4 to crack. In addition, the asymmetric tooth surfaces, asymmetric tooth segments and asymmetric angles formed by the plurality of the screw threads 34 can effectively increase the cutting ability during locking, and at the same time achieve a tight bite between the screw 3 and the object 4 to improve the tensile strength of the screw 3 after locking. Furthermore, when the screw 3 is screwed into the object 4, some chips can be accommodated in the plurality of the inclined surfaces 362, the accommodation groove 361, the plurality of the cutting grooves 372 and the plurality of the grooves 371, which can further increase the fastening force between the screw 3 and the object 4, and then strengthen the bite force and locking property after locking, and effectively avoid the defect that the screw 3 comes loose from the object 4.

[0078] Refer to Figure 8 , Figure 9 , Figure 9A and Figure 10As shown, the second preferred embodiment of the present invention still includes the components described in the first embodiment, and their objectives and functions are the same as those of the first embodiment, which will not be elaborated here. The special feature of this embodiment is that the tail portion 33 has a drill body 331 connected to the second end of the rod body 31, and two guiding grooves 332 recessed in the drill body 331 and arranged oppositely. A plurality of the guiding grooves 332 are respectively communicated with the accommodating grooves 361 of each chip discharging portion 36. In this embodiment, taking the screw 3 being set in a single-thread state as an example, the first tooth surface 341 of each tooth 34 faces the head portion 32 direction, and the second tooth surface 342 of each tooth 34 faces the tail portion 33 direction. In addition, the fifth vertical distance D5 formed by the first tooth bottom 344 of each first tooth surface 341 and the baseline R is different from the sixth vertical distance D6 formed by the second tooth bottom 345 of each second tooth surface 342 and the baseline R. In addition, the fifth angle θ5 formed by the first tooth segment 3411 of each first tooth surface 341 and the baseline R is also different from the sixth angle θ6 formed by the second tooth segment 3412 of each first tooth surface 341 and the baseline R. The tail portion 33 is arranged in a drill-tail shape in this embodiment, and it can be adjusted and changed according to actual use requirements, such as different shapes like a pointed tail or a drill tail. Therefore, when the tail portion 33 drills the object 4 at the initial stage of locking, the chips generated by the drilling of the tail portion 33 can enter the accommodating grooves 361 along the plurality of guiding grooves 332, so that the tail portion 33 can quickly guide the hole and drill into the object 4, and the plurality of chips can be quickly discharged outwards through the plurality of guiding grooves 332 and the accommodating grooves 361. This can not only effectively and quickly discharge the chips, but also improve the locking speed. In addition, the plurality of guiding grooves 332 can also accommodate an appropriate amount of chips, further improving the biting force and locking property after locking, so that the screw 3 is not easy to loosen after locking.

[0079] To sum up, for the screw of the present invention, a plurality of ribs are provided on the rod body, and a chip discharging portion is provided between any two adjacent ribs. The chip discharging portion has two inclined surfaces connected to the plurality of ribs, and an accommodating groove arranged between the plurality of inclined surfaces and connected to the plurality of inclined surfaces. At the same time, a plurality of cutting portions are provided on the plurality of teeth. In addition to assisting the plurality of teeth in cutting through the plurality of cutting portions and the plurality of ribs to improve the cutting ability, the plurality of inclined surfaces can also guide the generated chips into the accommodating groove to facilitate quickly discharging the plurality of chips outwards, which is more conducive to reducing the locking resistance and improving the locking speed. In addition, the first and second tooth bottoms of the plurality of teeth and the baseline of the tooth peak respectively form different vertical distances, and the first and second tooth segments of each first tooth surface extend at different angles, so that the plurality of teeth are arranged asymmetrically, which can further increase the cutting ability, achieve the effect of tightly biting the object, and improve the anti-pulling force after locking. Coupled with the fact that the plurality of inclined surfaces, the accommodating groove and the plurality of cutting portions can also accommodate an appropriate amount of chips, the biting force and locking property after locking are further increased, so that the screw is not easy to loosen.

[0080] 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, all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the invention specification should still fall within the scope covered by the patent of the present invention.

Claims

1. A screw, which includes a rod body, a first end and a second end respectively formed at opposite ends of the rod body, a head connected to the first end, a tail connected to the second end, and a plurality of threads spirally provided on the rod body. Wherein, the rod body defines a center line, each of the threads has a first tooth surface and a second tooth surface respectively extending outward from the rod body and facing opposite directions, and a tooth peak formed at the junction of the first tooth surface and the second tooth surface, and the tooth peak defines a baseline perpendicular to the center line. A first tooth bottom is formed at the junction of the first tooth surface and the outer peripheral edge of the rod body, and a second tooth bottom is formed at the junction of the second tooth surface and the outer peripheral edge of the rod body; It is characterized in that: the vertical distance formed between the first tooth bottom of each of the threads and the baseline is different from the vertical distance formed between the second tooth bottom of each of the threads and the baseline. Additionally, each of the first tooth surfaces of the threads has a first tooth segment connected to the rod body and a second tooth segment connected to the first tooth segment. The angle formed between the first tooth segment and the baseline is different from the angle formed between the second tooth segment and the baseline. And there are a plurality of cutting portions provided on the tooth peaks of at least two threads. Additionally, there are a plurality of ribs provided between the plurality of threads. The plurality of ribs protrude from the outer peripheral edge of the rod body and extend in a direction non-parallel to the center line. At the same time, there is a chip discharging portion provided between any two adjacent ribs. The chip discharging portion has a receiving groove extending between the plurality of threads and two inclined surfaces respectively provided on both sides of the receiving groove, and the plurality of inclined surfaces are respectively in contact with the two ribs, so as to guide the chips generated by the cutting of the plurality of ribs into the receiving groove through the plurality of inclined surfaces, and then discharge the plurality of chips.

2. The screw according to claim 1, It is characterized in that, the first tooth surface of each of the threads faces the head direction.

3. The screw according to claim 1, It is characterized in that, the plurality of threads are further divided into a plurality of first threads and a plurality of second threads provided between the plurality of first threads. The first tooth surface of each of the first threads faces the head direction, while the first tooth surface of each of the second threads faces the tail direction.

4. The screw according to any one of claims 1 to 3, It is characterized in that, the vertical distance formed between the first tooth bottom of each of the threads and the baseline is greater than the vertical distance formed between the second tooth bottom of each of the threads and the baseline.

5. The screw according to any one of claims 1 to 3, It is characterized in that, the angle formed between the first tooth segment and the baseline is greater than the angle formed between the second tooth segment and the baseline.

6. The screw according to any one of claims 1 to 3, It is characterized in that, the tail has a drill body connected to the second end of the rod body and two guiding grooves recessed on the drill body and arranged oppositely, and the two guiding grooves are respectively communicated with the receiving groove of the chip discharging portion, so that the chips generated by the drilling of the tail enter the receiving groove through the plurality of guiding grooves.

7. The screw according to any one of claims 1 to 3, It is characterized in that, Each of the cutting portions has at least one groove and a plurality of cutting slots provided on both sides of each groove. Each groove is recessed inward from the tooth peak so that two cutting edges are formed in each groove.

8. The screw according to claim 7, wherein, the plurality of cutting portions are arranged at intervals, and at least one groove of each cutting portion is arc-shaped.

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