Multifunctional screw

Abstract

The invention discloses a multifunctional screw, which is mainly characterized in that a drilling and tapping part connected with a rod body comprises a drilling body, two groove sections oppositely formed on the drilling body and a drilling tooth unit arranged on the drilling body, and a drilling and milling section is formed on the drilling body. Each groove section is provided with at least one wall and a rib cutting part, the at least one wall forms an accommodating space in a surrounding manner and is connected with the drilling and milling section, the rib cutting part protrudes outwards from the at least one wall, and the drilling tooth unit is spirally arranged on the drilling and milling section and is partially cut off by the two groove sections to form at least two tapping sections; through the cooperation of the rib cutting parts and the tapping sections, the drilling and milling section can play roles in reaming and pulling down, so that drilling and locking operation is effectively implemented, stable cutting in the drilling and locking cutting period is achieved on the whole, drilling and locking resistance is reduced, and the effect of preventing an object from cracking is achieved.

Description

Technical Field

[0001] The present invention relates to a screw, and more particularly to a multi-functional screw. Background Art

[0002] Referring to Figure 1 , the existing screw 1 includes a rod body 11, a screw head 12 provided at one end of the rod body 11, and a plurality of screw threads 13 spirally arranged on the rod body 11. Among them, the other end of the rod body 11 is tapered to form a tip 14, and a cutting groove 15 is formed on the rod body 11; during use, the screw head 12 is rotated to drive a plurality of the screw threads 13 to drill and lock into an object such as wood (not shown in the figure), and the cutting groove 15 cuts the object, and the chips generated by cutting are accommodated in the cutting groove 15 to complete the locking; however, the opening of a single cutting groove 15 has limited cutting effect and cannot effectively cut off wood fibers. In addition, its chip removal effect and chip accommodation space are also limited. The chips are easily blocked in the cutting groove 15 due to insufficient chip removal, resulting in greater drilling and locking resistance. Even the chips are easily over-accumulated and extruded outward, causing the material to crack; furthermore, since only the tip 14 abuts against the object, the force-bearing area is small, so the tip 14 is easily deviated from the original abutting position due to improper force application during drilling and locking, which instead affects the drilling and locking operation of the screw 1; in view of this, the applicant of this case feels that the existing design still needs to be improved. After careful thinking and painstaking research, the invention of this case has been developed. Summary of the Invention

[0003] Therefore, the object of the present invention is to provide a multi-functional screw, which can achieve the functions of reaming, reducing drilling and locking resistance for quick drilling and locking, and more effectively preventing the object from cracking.

[0004] Therefore, the multi-functional screw of the present invention includes a screw head, a rod body extending outward from the screw head and defining a center line, a thread unit spirally disposed on the rod body, and a drilling and tapping portion connected to the rod body. Among them, the thread unit has a plurality of threads spirally disposed on the outer peripheral edge of the rod body. As for the drilling and tapping portion, it includes a drill body connected to the rod body, two groove sections formed on the drill body and disposed oppositely, and a drill tooth unit annularly disposed on the drill body. Wherein, the drill body extends outward from the rod body and forms a drilling and milling section, and the drilling and milling section has an end opposite to the direction of the rod body. Each groove section includes at least one wall connected to the drilling and milling section and a cutting rib portion protruding outward from the at least one wall. The at least one wall can surround and form a receiving space for receiving and discharging chips, and the outward protrusion of the cutting rib portion further defines an end point farthest from the center line. Furthermore, when viewed from the end, a first distance is defined from the end point of the cutting rib portion of one groove section to the end point of the cutting rib portion of the other groove section. At the same time, a second distance is defined from the contact point of the at least one wall of the one groove section and the outer peripheral edge of the drilling and milling section to the contact point of the at least one wall of the other groove section and the outer peripheral edge of the drilling and milling section. The first distance is greater than the second distance. The drill tooth unit is spirally disposed on the outer peripheral edge of the drilling and milling section in at least one turn. At the same time, the drill tooth unit is partially cut by a plurality of the groove sections, thereby forming at least two tapping sections protruding from the outer peripheral edge of the drilling and milling section, and each tapping section is exactly located on one side of each cutting rib portion. Accordingly, by using the drill tooth unit disposed on the drilling and milling section and the arrangement of a plurality of the cutting rib portions, it is beneficial to achieve a reaming effect and generate a downward pulling force during drilling and locking, so as to rotate and cut an object and quickly drive the drilling and tapping portion to drill and lock into the object, and also avoid the deviation of the abutting position of the drilling and tapping portion. Moreover, the cutting action of a plurality of the cutting rib portions helps to reduce the drilling and locking resistance borne by a plurality of the tapping sections, is more beneficial to the quick cutting and chip discharging effect of the screw on the object, and effectively avoids the occurrence of the object cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 is a schematic view of a conventional screw.

[0006] Figure 2 is a schematic structural view of the first preferred embodiment of the present invention viewed from an angle.

[0007] Figure 2A is Figure 2 a schematic view of the circled portion X1 of

[0008] Figure 2B is Figure 2A a variant of

[0009] Figure 2C is Figure 2 a schematic view of the circled portion X2 of

[0010] Figure 2D is Figure 2C a variant form.

[0011] Figure 2E is Figure 2 a schematic cross-sectional view taken along line A-A.

[0012] Figure 2F is Figure 2E a variant form.

[0013] Figure 2G is Figure 2E a variant form.

[0014] Figure 3 It is a schematic structural view of the first preferred embodiment of the present invention viewed from another angle.

[0015] Figure 3A is Figure 3 a three-dimensional schematic view of the circled area X3 of

[0016] Figure 3B is Figure 3 a bottom view of

[0017] Figure 4 It is a partial schematic view of a variant form of the first preferred embodiment of the present invention.

[0018] Figure 5 It is a schematic structural view of another variant form of the first preferred embodiment of the present invention.

[0019] Figure 6 It is a partial schematic view of yet another variant form of the first preferred embodiment of the present invention.

[0020] Figure 6A is Figure 6 a three-dimensional schematic view of the circled area X4 of

[0021] Figure 6B is Figure 6 a bottom view of

[0022] Figure 7-1 It is a schematic structural view of yet another variant form of the first preferred embodiment of the present invention.

[0023] Figure 7-2 It is a schematic structural view of yet another variant form of the first preferred embodiment of the present invention.

[0024] Figure 8 It is a schematic view of the implementation form of the first preferred embodiment of the present invention.

[0025] Figure 9 It is a schematic structural view of the second preferred embodiment of the present invention.

[0026] Figure 9A is Figure 9 a three-dimensional schematic diagram of the circled area X5 of

[0027] Figure 9B is Figure 9 a bottom view of

[0028] Figure 10 a structural schematic diagram of the third preferred embodiment of the present invention.

[0029] Figure 11 a structural schematic diagram of the fourth preferred embodiment of the present invention.

[0030] Figure 12 a structural schematic diagram of the fifth preferred embodiment of the present invention viewed from an angle.

[0031] Figure 12A is Figure 12 a three-dimensional schematic diagram of the circled area X6 of

[0032] Figure 12B is Figure 12 a bottom view of

[0033] Figure 13 a structural schematic diagram of the sixth preferred embodiment of the present invention.

[0034] Figure 13A is Figure 13 a three-dimensional schematic diagram of the circled area X7 of

[0035] Figure 14 a structural schematic diagram of the seventh preferred embodiment of the present invention.

[0036] Figure 14A is Figure 14 a three-dimensional schematic diagram of the circled area X8 of

[0037] Figure 15 a structural schematic diagram of the eighth preferred embodiment of the present invention.

[0038] Figure 15A is Figure 15 a three-dimensional schematic diagram of the circled area X9 of

[0039] Figure 16 a structural schematic diagram of the ninth preferred embodiment of the present invention.

[0040] Figure 16A is Figure 16 a three-dimensional schematic diagram of the circled area X10 of

[0041] Figure 16B is Figure 16 a bottom view of

[0042] Figure 17It is a schematic structural diagram of the tenth preferred embodiment of the present invention.

[0043] Figure 17A It is Figure 17 a bottom view of.

[0044] Figure 18 It is Figure 17 a schematic diagram of the implementation aspect of.

[0045] Figure 19 It is a schematic structural diagram of a variant aspect of the eleventh preferred embodiment of the present invention.

[0046] Figure 19A It is Figure 19 a bottom view of.

[0047] Figure 20 It is Figure 19 a schematic diagram of the implementation aspect of.

[0048] Figure 21 It is a schematic structural diagram of another variant aspect of the eleventh preferred embodiment of the present invention.

[0049] Figure 21A It is Figure 21 a bottom view of.

[0050] Figure 22 It is Figure 21 a schematic diagram of the implementation aspect of.

[0051] Symbol description:

[0052] (Prior art)

[0053] 1: Screw

[0054] 11: Rod body

[0055] 12: Screw head

[0056] 13: Thread

[0057] 14: Tip

[0058] 15: Groove

[0059] (The present invention)

[0060] 3: Multi-functional screw

[0061] 31: Screw head

[0062] 32: Rod body

[0063] 33: Thread unit

[0064] 34: Drilling and tapping part

[0065] 331: Thread

[0066] 341: Drill body

[0067] 341A: Drill and mill section

[0068] 342: Groove section

[0069] 343: Drill tooth unit

[0070] 3311: Upper thread surface

[0071] 3312: Lower thread surface

[0072] 3313: Thread crest

[0073] 3411: End

[0074] W: Wall

[0075] 3421: First wall

[0076] 3422: Second wall

[0077] 3423: Third wall

[0078] 3424: Cutting rib part

[0079] 3425: Arc surface

[0080] 3426: Second taper part

[0081] 3431: Tapping section

[0082] 34311: Upper tapping surface

[0083] 34312: Lower tapping surface

[0084] 34313: Tapping crest

[0085] 3411a: Drill point

[0086] 3411b: First taper part

[0087] 3411c: End face

[0088] a1: Angle between upper thread surface and baseline

[0089] a2: Angle between lower thread surface and baseline

[0090] a3: Angle of drill point

[0091] a4: Angle between upper tapping surface and reference line

[0092] a5: Angle between lower tapping surface and reference line

[0093] a6: Angle of groove

[0094] C1: Center line

[0095] D1: Outer diameter of the rod

[0096] D2: Diameter of the drill body

[0097] L1: First distance

[0098] L2: Second distance

[0099] OP1: Outer peripheral edge of the rod

[0100] P1: End point

[0101] P2: Junction point

[0102] R1: Baseline

[0103] R2: Reference line

[0104] S1: Accommodating space

[0105] S2: Groove

[0106] S3: First notch

[0107] S3’: Second notch

[0108] S4: Recess Detailed implementation mode

[0109] 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.

[0110] Refer to Figure 2 、 Figure 3 , the first preferred embodiment of the multi-functional screw 3 of the present invention. The screw 3 includes a screw head 31, a rod body 32 extending outward from the screw head 31, a thread unit 33 spirally provided on the rod body 32, and a drilling and tapping portion 34 connected to the rod body 32. Among them, the shape of the screw head 31 can be adjusted according to requirements. For example, a plurality of ribs 311 (as shown in Figure 4 ) can be provided on the bottom surface of the screw head 31 to achieve the functions of assisting cutting and preventing loosening. Furthermore, the rod body 32 extends axially and defines a center line C1, and an auxiliary thread section 4 (as shown in Figure 4 ) can also be provided on the rod body 32 in due course between the thread unit 33 and the screw head 31, and the spiral angle of the auxiliary thread section 4 is different from that of the thread unit 33, so as to continue the subsequent drilling and locking operation of the thread unit 33.

[0111] With reference to Figure 2A, the thread unit 33 has a plurality of threads 331, and the plurality of threads 331 are mainly spirally disposed around the outer peripheral edge OP1 of the rod body 32. At the same time, each thread 331 has an upper thread surface 3311 and a lower thread surface 3312 facing opposite directions, and a thread crest 3313 disposed at the junction of the upper and lower thread surfaces 3311, 3312. The upper thread surface 3311 faces the direction of the screw head 31, and the lower thread surface 3312 faces the direction opposite to that of the upper thread surface 3311. The thread crest 3313 further defines a baseline R1 perpendicular to the center line C1, and the angle a1 between the baseline R1 and the upper thread surface 3311 may be different from the angle a2 between the baseline R1 and the lower thread surface 3312 (see Figure 2A ), or the angle a1 may be the same as the angle a2 (see Figure 2B ). In particular, the following implementation actions are only described by taking the example that the angle a1 is different from the angle a2, so that the plurality of threads 331 can enter an object quickly and with a small drilling and locking resistance, and it is also helpful to improve the anti-pulling-out effect to prevent the screw 3 from being easily pulled out; in addition, the shapes of the rod body 32 and the plurality of threads 331 may be circular, or may be a non-circular shape such as triangular (see Figure 2F ), quadrangular (see Figure 2G ), etc., and it can further have a sharp cutting effect to cut the object, which is also beneficial to achieve a labor-saving effect. The following implementation actions are only described by taking the Figure 2E shown circular shape as an example.

[0112] Referring to Figure 3 and Figure 3A , the drilling and tapping part 34 includes a drill body 341, two groove sections 342, and a drill tooth unit 343; wherein, the drill body 341 is connected to the rod body 32, that is, the drill body 341 extends outward from the rod body 32 and forms a drilling and milling section 341A. The drilling and milling section 341A refers to a section whose conical surface is cut and formed with holes (i.e., the following groove sections), and thus forms a section with a cutting function and a chip accommodating and discharging function. The drilling and milling section 341A has an end 3411 opposite to the direction of the rod body 32, and the drilling and milling section 341A can be inclined and tapered toward the center line C1 to form the end 3411, so that the end 3411 itself can form a single drill point 3411a (as shown in Figure 2 ), or the end 3411 of the drilling and milling section 341A can form a drill tail structure with a single drill point 3411a (as shown in Figure 12 , which will be described later), and regardless of the Figure 2 or Figure 12In the illustrated aspect, the center line C1 can pass through the drilling point 3411a to serve as a center drilling point, and the included angle a3 formed by the intersection of the drilling points 3411a can be 40 to 120 degrees, preferably 60 to 90 degrees. Alternatively, the end portion 3411 can be formed into a structural form without the aforementioned single drilling point 3411a (as Figures 17 to 22 shown, which will be described later); thus, the shape of the end portion 3411 can be adjusted according to the different materials of the object into which the screw 3 is to be drilled.

[0113] Still referring to Figure 2 , the two groove sections 342 are formed on the drill body 341 and are disposed opposite to each other, that is, the two groove sections 342 together constitute a groove portion recessed on the drill milling section 341A; furthermore, each groove section 342 can be formed not only on the drill milling section 341A but also extend in the direction of the screw head 31 at the same time to increase its extension length (as Figure 6 shown); wherein, each groove section 342 has a receiving space S1 surrounded by at least one wall W, that is, the receiving space S1 can be formed by surrounding with a single wall or more than one wall; in the embodiments shown in the present invention, only the case of having three walls W is taken as an example for illustration, that is, the groove section 342 includes a first wall 3421 connected to the outer periphery of the drill milling section 341A and extending in the direction of the end portion 3411, a second wall 3422 connected to the first wall 3421 and located between the first wall 3421 and the rod body 32, and a third wall 3423 connected to the first wall 3421 and the second wall 3422. Therefore, the receiving space S1 is formed by surrounding the first wall 3421, the second wall 3422, and the third wall 3423 to receive and guide the discharge of chips to avoid excessive chip accumulation; furthermore, the wall surfaces of the first wall 3421, the second wall 3422, and the third wall 3423 can be flat (see Figure 2 ), arc-shaped (see Figure 5 ), twisted (see Figure 16 ) and other aspects. When multiple wall surfaces are flat or arc-shaped, the receiving space S1 can not only receive and discharge chips, but also have sharpness for cutting objects. The following implementation operations will be described by taking the Figure 2 shown aspect as an example; in addition, if the groove section 342 has only a single wall and the wall is formed into a spherical arc surface, or if the groove section 342 has multiple walls, such as taking the above three walls as an example, a circular arc surface 3425 can also be formed at the joints of the multiple walls 3421, 3422, 3423 (as Figure 7-1 , Figure 7-2 shown) to form a spherical contour, so that the receiving space S1 can be formed into a spherical or similar spherical space as a whole, and it is more difficult for chips to accumulate.

[0114] In addition, according toFigure 3B An upward view as seen from the end portion 3411 as shown, in which a first wall 3421 of one groove section 342 is connected to the outer peripheral edge of the drill and mill section 341A to form a connection point P2, and the connection point P2 may refer to the end point of the first wall 3421 that is farthest from the center line C1. At the same time, a first wall 3421 of another groove section 342 is connected to the outer peripheral edge of the drill and mill section 341A to form another connection point P2. The length between the two connection points P2 is defined as a second distance L2.

[0115] Each groove section 342 also has a cutting rib 3424, which protrudes outward from the at least one wall W (i.e., as shown in the figure, the cutting rib 3424 is provided on the third wall 3423 to protrude outward), and Figure 3B As shown, when the cutting rib 3424 protrudes outward, the protruding part has an end point P1 that is farthest from the center line C1 of the rod body 32. Therefore, for the two groove sections 342 of the groove part, one groove section 342 has a cutting rib 3424 with an end point P1, and the other groove section 342 has a cutting rib 3424 with an end point P1. The length between the two end points P1 is defined as a first distance L1, and the first distance L1 is greater than the second distance L2. The first distance L1 can be 1.01 to 1.5 times the second distance L2, preferably 1.01 to 1.2 times.

[0116] In addition, the threading unit 343 is spirally wound around the drill body 341. In particular, the threading unit 343 is spirally wound around the outer peripheral edge of the drill and mill section 341A for at least one turn, such as Figure 2 shown as one turn of spiral, or it can be in a spiral pattern of more than one turn as shown in Figure 6 so as to expand the distribution range of the plurality of tapping segments 3431. In particular, the number of the tapping segments 3431 can be increased to achieve the effect of expanding the distribution range. Accordingly, through the cooperation of the drill and mill section 341A and the threading unit 343, it is beneficial to expand the hole and generate a downward pulling force to achieve the effect of drilling into an object. At the same time, when the threading unit 343 is in one turn or multiple turns of spiral, a local part of the threading unit 343 is cut by the plurality of groove sections 342. Therefore, the uncut part forms at least two tapping segments 3431, that is, Figure 2 shown as having two tapping segments 3431, or as shown in Figure 6The shown one has more than two tapping segments 3431, and a plurality of these tapping segments 3431 protrude from the outer peripheral edge of the drill and mill section 341A. At the same time, each tapping segment 3431 can be exactly located on one side of each rib cutting part 3424. Furthermore, each tapping segment 3431 has an upward tapping surface 34311 and a downward tapping surface 34312 with opposite orientations, and a tapping crest 34313 provided at the junction of the upward and downward tapping surfaces 34311 and 34312. The upward tapping surface 34311 faces the direction of the screw head 31, and the downward tapping surface 34312 faces the direction opposite to that of the upward tapping surface 34311. The tapping crest 34313 further defines a reference line R2 perpendicular to the center line C1, and the angle a4 between the upward tapping surface 34311 and the reference line R2 can be the same as the angle a5 between the downward tapping surface 34312 and the reference line R2 (see Figure 2C ), and the two angles a4 and a5 can both be 30 degrees or other appropriate angles, so as to generate different downward pulling speeds to achieve the effect of allowing the drilling and tapping part 34 to drill into the object; alternatively, the above two angles a4 and a5 can also be different from each other. For example, the angle a4 is greater than the angle a5 (see Figure 2D ); and the following implementation actions only take Figure 2C the case where the two angles a4 and a5 shown are the same as an example for explanation.

[0117] Furthermore, the total sum of the two angles a1 and a2 of the thread 331 may not exceed the total sum of the two angles a4 and a5 of the tapping segment 3431, that is, the total sum of the two angles a4 and a5 is greater than or equal to the total sum of the two angles a1 and a2. Therefore, a plurality of these tapping segments 3431 can perform the initial drilling of the drilling and locking operation, so as to reduce the drilling and locking resistance of a plurality of these threads 331 when drilling in. In the implementation action of the first embodiment, the case where the total sum of the two angles a4 and a5 (for example, 60 degrees) is greater than the total sum of the two angles a1 and a2 (for example, 40 degrees) is taken as an example to present.

[0118] Refer to Figure 2 、 Figure 3 and Figure 8, the screw 3 is used to drill and lock into an object 5, and the object 5 can be made of iron plate, wood (such as hardwood, softwood), cement and other materials, so that the screw 3 can be widely used. Here, only one example of wood is taken as the object 5 for illustration; when in use, first use the end 3411 (i.e., the drilling point 3411a) to abut against the surface of the wood 5, and rotate the screw head 31 to perform a drilling and locking operation; at the initial stage of the drilling and locking operation, the internal fibers of the wood 5 will be cut by each groove section 342, that is, use the cutting rib portion 3424 to cooperate with the accommodating space S1 surrounded by the plurality of walls 3421, 3422, 3423 to perform a cutting action, that is, cut off the internal fibers of the wood 5 that are crisscrossed, which can reduce the frictional force between the wood 5 and the drilling and tapping portion 34. During the process of the plurality of cutting rib portions 3424 cutting off the fibers and forming a drill hole, the plurality of cutting rib portions 3424 not only assist the milling section 341A to expand the diameter of the drill hole to achieve the effect of enlarging the hole, but also the plurality of tapping sections 3431 located on one side of the plurality of cutting rib portions 3424 generate a pulling force, so that the plurality of tapping sections 3431 can not only cut the wood 5 to quickly drive the drill body 341 to drill and lock into the wood 5, but also prevent the abutting position of the drilling point 3411a from shifting. Therefore, the drill tooth unit 343 can be stably engaged with the wood 5 at the initial stage of drilling and locking.

[0119] During the drilling and locking process of the drilling and tapping portion 34, a plurality of fibers are cut off by the plurality of cutting rib portions 3424 to form chips. In addition, since the first distance L1 is greater than the second distance L2, the cutting action of the plurality of cutting rib portions 3424 can be screwed into the wood 5 to form a spiral track, which can also achieve the effect of enlarging the hole, and can also cooperate with the plurality of accommodating spaces S1 to accommodate chips and guide the movement of chips. In this way, it can effectively avoid the situation of splitting of the material (i.e., the object splitting) caused by excessive chip accumulation and outward extrusion. After that, the plurality of tapping sections 3431 directly enter the wood 5 along the spiral track, so that the plurality of tapping sections 3431 are engaged with the wood 5 and cut and drilled into the wood 5. Therefore, the formation of the spiral track can reduce the resistance borne by the drill tooth unit 343, which is beneficial to reducing the drilling and locking resistance and quickly drilling and locking. Moreover, the plurality of chips can also move along the spiral direction of the drill tooth unit 343 and the accommodating space S1, then enter the rod body 32, and then discharge outward from the screw head 31 along the spiral direction of the thread unit 33. Therefore, the overall effect can achieve rapid chip removal, improve the drilling and locking efficiency, avoid splitting of the material, and can also accommodate an appropriate amount of chips to achieve a stable locking effect.

[0120] Refer to Figure 9, the second preferred embodiment of the multi-functional screw 3 of the present invention still includes the same components, implementation operations and achieved purposes and effects as the first preferred embodiment, which will not be repeated here; in particular, in this embodiment, a plurality of slots S2 can be provided on at least one thread 331 of the thread unit 33. In the figure, a plurality of slots S2 are provided on each of the partial threads 331 as an example. By using the plurality of slots S2 to form an uneven and staggered configuration, such as a serrated or wavy shape, the design of the plurality of slots S2 can assist the thread unit 33 in cutting, that is, achieve an auxiliary cutting effect, and the overall effect can also reduce the drilling and locking resistance, chip removal, prevent the object from cracking, and improve the drilling and locking efficiency.

[0121] Refer to Figure 10 , the third preferred embodiment of the multi-functional screw 3 of the present invention still includes the same components, implementation operations and achieved purposes and effects as the first preferred embodiment, which will not be repeated here; in particular, in this embodiment, an outer periphery of the drill and mill section 341A further defines a drill body diameter D2. In particular, the widest part of the outer periphery of the drill and mill section 341A can define the drill body diameter D2, and an outer periphery OP1 of the rod body 32 also defines a rod outer diameter D1. The drill body diameter D2 is greater than the rod outer diameter D1. In particular, the drill body diameter D2 is 1.01 to 1.4 times the rod outer diameter D1; therefore, the screw 3 is mainly applicable to drilling into an object such as the edge of a hardwood or a wooden board, etc.; generally speaking, when the edge of the hardwood or wooden board is squeezed due to the drilling action of the screw 3, if the edge of the hardwood or wooden board cannot withstand the squeezing force, it is easy to crack. In this embodiment, the wider drill and mill section 341A can play a role in reaming the hole, and can also play a role in accommodating chips and guiding the chips to move to achieve chip removal. In particular, the reaming effect can effectively avoid the problem of splitting the material. Therefore, the screw 3 as a whole is beneficial to reducing the drilling and locking resistance, chip removal, preventing the object from cracking, and improving the drilling and locking efficiency.

[0122] Refer to Figure 11, the fourth preferred embodiment of the multi-functional screw 3 of the present invention is different from the third preferred embodiment in that: the diameter D2 of the drill body is smaller than the outer diameter D1 of the rod body, especially the outer diameter D1 of the rod body is 1.01 to 1.4 times the diameter D2 of the drill body; therefore, the screw 3 is mainly applicable to drilling into an object such as a cork, a gypsum board, a plastic board, a calcium silicate board, etc.; for example, taking the soft cork with a soft structure as an object for illustration, generally speaking, after the screw 3 is drilled into the cork, due to external vibration or pulling force and other factors, the structure of the cork may be damaged, resulting in the problem of loosening or even falling off of the screw 3. In this embodiment, the narrower drilling and milling section 341A can form a smaller drill hole during drilling, so the wider rod body 32 can continue to drill into the smaller drill hole, while pressurizing the inside of the object, making the combination between the screw 3 and the object tighter, so as to achieve the effect of increasing the fastening force, thus avoiding the loosening of the screw 3, that is, achieving the anti-loosening effect, and overall it is also beneficial to reduce the drilling and locking resistance, avoid the object from cracking, and improve the drilling and locking efficiency.

[0123] Refer to Figure 12 , the fifth preferred embodiment of the multi-functional screw 3 of the present invention still includes the same components as the first preferred embodiment, but is different in that, in the first preferred embodiment, the end 3411 of the drilling and milling section 341A itself forms a drill point 3411a, so it can be in a pointed tail structure (see Figure 2 ); while in the fifth preferred embodiment, two opposite first tapered portions 3411b inclined to the center line C1 are formed at the end 3411, and the intersection of the two first tapered portions 3411b forms the drill point 3411a, so it can be in a drill tail structure (see Figure 12A 、 Figure 12B ).

[0124] Furthermore, under the aforementioned drill tail structure, each groove section 342 can further include a second tapered portion 3426 located in the drilling and milling section 341A and spaced from the end 3411, and the second tapered portion 3426 is inclined to the center line C1 and extends outward from the outer periphery of the drilling and milling section 341A, that is, the second tapered portion 3426 is in an inclined and outward-expanded state; therefore, with this drill tail structure and the configuration of the aforementioned details of the drilling and tapping portion 34, the screw 3 is mainly applicable to drilling and locking into an object such as an iron plate or cement, etc., that is, using multiple first tapered portions 3411b to achieve the initial drilling and reaming functions, and then continuing to cut and ream again by multiple cutting rib portions 3424 and second tapered portions 3426, so that the drilling and tapping portion 34 can drill into the object more quickly. Therefore, this embodiment can achieve the secondary reaming function, and at the same time achieve rapid drilling and locking, as well as chip accommodation and chip removal functions. Furthermore, the overall screw 3 can achieve the effects of reducing the drilling and locking resistance, avoiding the object from cracking, and improving the drilling and locking efficiency.

[0125] Refer to Figure 13 、 Figure 14 、Figure 15 , which are respectively the sixth, seventh, and eighth preferred embodiments of the multi-functional screw 3 of the present invention. Particularly, the drilling and tapping portion 34 is further provided with a plurality of notches to be arranged in a toothed configuration. For example, a plurality of first notches S3 can be arranged on Figure 2 the outer periphery of the drilling and milling section 341A of the pointed tail structure shown in the figure, and its combined state is as shown in Figure 13 , Figure 13A ; a plurality of the first notches S3 can also be arranged on Figure 12 the outer periphery of the drilling and milling section 341A of the drill tail structure shown in the figure, and its combination is as shown in Figure 14 , Figure 14A , or a plurality of second notches S3' can be arranged on the two first tapered portions 3411b, and its combined state is as shown in Figure 15 , Figure 15A ; through this toothed configuration, an auxiliary cutting effect can be exerted to increase the cutting ability of the plurality of cutting rib portions 3424 and the drill tooth unit 343. Overall, it also helps with chip removal, avoids object cracking, reduces the friction between the screw 3 and the object 5, and reduces the drilling and locking resistance, thereby improving the drilling and locking efficiency.

[0126] Refer to Figure 16 , the ninth preferred embodiment of the multi-functional screw 3 of the present invention still includes the same components as the first preferred embodiment; particularly, in this embodiment, the drill body 341 is arranged in a twisted spiral, that is, the outer periphery of the drilling and milling section 341A extends in an arc shape in a clockwise (positive) or counterclockwise (negative) rotation direction, so that the accommodation space S1 of each groove section 342 is formed in a spiral groove state. In this embodiment, only the positive twist is taken as an example for presentation. Through this twisted spiral design, cutting, chip accommodation, and chip removal effects can be exerted to increase the drilling and locking ability of the drilling and tapping portion 34. Overall, it also helps to reduce the drilling and locking resistance and avoid object cracking, thereby improving the drilling and locking efficiency.

[0127] Refer to Figure 17 , the tenth preferred embodiment of the multi-functional screw 3 of the present invention still includes the same components and connection relationships as the first preferred embodiment. The difference is that in this embodiment, the end portion 3411 can be formed into a structural form without the aforementioned single drill point 3411a, that is, the end portion 3411 has an end face 3411c, and the end face 3411c can be in a flat state. Even one edge of the end face 3411c can be connected to one of the tapping sections 3431; through this flat design, it is mainly beneficial for the screw 3 to be drilled and locked into an object 5 in an inclined manner (as shown in Figure 18As shown, the edge portions of the end face 3411c on both sides can be used as the cutting points P3, so that the two cutting points P3 can cut the object 5. Together with the cooperation of a plurality of the cutting rib portions 3424 and the drill tap unit 343, it is more conducive to quickly drill into the object 5 to perform a drilling and locking operation, and it also helps to discharge chips, prevent the object from cracking, reduce the drilling and locking resistance, and improve the drilling and locking efficiency.

[0128] Referring to Figures 19 to 22 , the eleventh preferred embodiment of the multi-functional screw 3 of the present invention still includes the same elements as the tenth preferred embodiment. In particular, in this embodiment, a groove S4 is further formed on the end face 3411c to present a concave shape. The concave shape can be an arc-shaped groove S4 (refer to Figure 19 ), a groove S4 having an included angle a6 (refer to Figure 21 ), etc.; this embodiment is also beneficial for the drill tapping portion 34 to drill and lock into an object 5 in an inclined manner (as shown in Figure 20 , Figure 22 ). Through the concave design, the two edge portions serving as the cutting points P3 can be made sharper, facilitating rapid cutting. Overall, it also helps to discharge chips, prevent the object from cracking, reduce the drilling and locking resistance, and improve the drilling and locking efficiency.

[0129] To sum up, the multi-functional screw of the present invention mainly lies in that the drill tapping portion has a drill milling section, and two groove sections and a drill tap unit provided on the drill milling section. In particular, each groove section has a cutting rib portion protruding outward, and a tapping section located on one side of a plurality of the cutting rib portions. In addition, there is a relatively large first distance between the plurality of the cutting rib portions of the two opposite groove sections. Through the cooperation of a plurality of the cutting rib portions and the tapping section, when the drill milling section drills in, it can not only achieve reaming, but also generate a downward pulling force, so as to facilitate quickly drilling and locking into the object, and prevent the offset of the abutting position of the drill tapping portion. At the same time, it also reduces the drilling and locking resistance. Overall, it helps to strengthen the quick cutting, chip accommodation, and chip guiding effects of the screw on the object, and also prevents the object from cracking. Therefore, the purpose of the present invention can indeed be achieved.

[0130] The above description is only for illustrating 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 multi-functional screw, comprising a screw head, a rod body extending outward from the screw head and defining a center line, a thread unit provided on the rod body, and a drilling and tapping portion connected to the rod body, wherein, the thread unit has threads spirally arranged on the outer peripheral edge of the rod body; and it is characterized in that: the drilling and tapping portion includes a drill body connected to the rod body, two groove sections oppositely formed on the drill body, and a drill tooth unit annularly arranged on the drill body. Wherein, the drill body extends outward from the rod body and forms a milling section, the milling section has an end opposite to the direction of the rod body, each groove section includes at least one wall connected to the milling section, a receiving space surrounded by the at least one wall, and a cutting rib portion protruding outward from the at least one wall; and the outward protrusion of the cutting rib portion further defines an end point farthest from the center line, and when viewed from the end, a first distance is defined from the end point of the cutting rib portion of one groove section to the end point of the cutting rib portion of the other groove section, and a second distance is defined from the connection point of the at least one wall of the one groove section and the outer peripheral edge of the milling section to the connection point of the at least one wall of the other groove section and the outer peripheral edge of the milling section. The first distance is greater than the second distance. The drill tooth unit is spirally arranged in at least one turn on the outer peripheral edge of the milling section and is partially cut off by a plurality of the groove sections, thereby forming at least two tapping sections protruding on the milling section, and each tapping section is exactly located on one side of each cutting rib portion.

2. The multi-functional screw according to claim 1, characterized in that, the first distance is 1.01 to 1.5 times the second distance.

3. The multi-functional screw according to claim 1, characterized in that, the outer peripheral edge of the milling section further defines a drill body diameter, and the outer peripheral edge of the rod body also defines a rod body outer diameter. The drill body diameter is 1.01 to 1.4 times the rod body outer diameter.

4. The multi-functional screw according to claim 1, wherein, the outer peripheral edge of the milling section defines a drill body diameter, and the outer peripheral edge of the rod body also defines a rod body outer diameter. The rod body outer diameter is 1.01 to 1.4 times the drill body diameter.

5. The multi-functional screw according to claim 1, characterized in that, the end is formed into a single drill point, and the included angle formed by the intersection of the drill points is 40 to 120 degrees.

6. The multi-functional screw according to claim 1, characterized in that, the end has two opposite first tapered portions, and the two first tapered portions are inclined to the center line and intersect at a single drill point, and the included angle formed by the intersection of the drill points is 40 to 120 degrees.

7. The multi-functional screw according to claim 6, characterized in that, each groove section further includes a second tapered portion located in the milling section and spaced from the end. The second tapered portion is inclined to the center line and extends outward from the outer peripheral edge of the milling section.

8. The multi-functional screw according to claim 1, characterized in that, the end is formed into an end face.

9. The multi-functional screw according to claim 8, characterized in that, the end face is further provided with a groove.

10. The multi-functional screw according to claim 8, characterized in that, one edge of the end face is joined to one of the tapping sections.

11. The multi-functional screw according to claim 1, characterized in that, at least one thread of the thread unit is provided with a plurality of slits.

12. The multi-functional screw according to claim 1, characterized in that, a plurality of first notches are provided on the outer peripheral edge of the drilling and milling section.

13. The multi-functional screw according to claim 6, characterized in that, a plurality of second notches are provided on the two first tapered portions.

14. The multi-functional screw according to claim 1, characterized in that, the drill body is arranged in a twisted spiral.

15. The multi-functional screw according to claim 1, characterized in that, each of the groove sections includes a first wall joined to the outer peripheral edge of the drilling and milling section and extending towards the end portion, a second wall joined to the first wall and located between the first wall and the rod body, and a third wall joined to the first wall and the second wall. An accommodation space is formed by surrounding the first wall, the second wall, and the third wall. The cutting rib portion is provided on the third wall and protrudes outward.

16. The multi-functional screw according to claim 15, characterized in that, a circular arc surface is formed at the junction of the first wall, the second wall, and the third wall.

17. The multi-functional screw according to claim 15, characterized in that, the wall surfaces of the first wall, the second wall, and the third wall are flat.

18. The multi-functional screw according to claim 15, characterized in that, the wall surfaces of the first wall, the second wall, and the third wall are arc-shaped.

19. The multi-functional screw according to claim 1, characterized in that, at least one of the walls has a spherical arc surface.

20. The multi-functional screw according to claim 1, characterized in that, each thread has an upper thread surface facing the screw head, a lower thread surface opposite to the upper thread surface, and a thread crest provided at the junction of the upper and lower thread surfaces. The thread crest further defines a baseline perpendicular to the center line. At the same time, each tapping section has an upper tapping surface facing the screw head, a lower tapping surface opposite to the upper tapping surface, and a tapping crest provided at the junction of the upper and lower tapping surfaces. The tapping crest further defines a reference line perpendicular to the center line; the sum of the angles between the upper thread surface and the baseline and between the lower thread surface and the baseline does not exceed the sum of the angles between the upper tapping surface and the reference line and between the lower tapping surface and the reference line.

21. The multi-functional screw according to claim 1, characterized in that, each thread has an upper thread surface facing the screw head, a lower thread surface opposite to the upper thread surface, and a thread crest provided at the junction of the upper and lower thread surfaces. The thread crest further defines a baseline perpendicular to the center line, and the angle between the upper thread surface and the baseline is different from the angle between the lower thread surface and the baseline.

22. The multi-functional screw according to claim 1, characterized in that, Each of the threads has an upper thread surface facing the screw head, a lower thread surface opposite to the upper thread surface, and a thread crest disposed at the junction of the upper and lower thread surfaces. The thread crest further defines a baseline perpendicular to the center line, and the angle between the upper thread surface and the baseline is the same as the angle between the lower thread surface and the baseline.

23. The multi-functional screw according to claim 1, wherein, each of the tapping sections has an upper tapping surface facing the screw head, a lower tapping surface opposite to the upper tapping surface, and a tapping crest disposed at the junction of the upper and lower tapping surfaces. The tapping crest further defines a reference line perpendicular to the center line, and the angle between the upper tapping surface and the reference line is the same as the angle between the lower tapping surface and the reference line.

24. The multi-functional screw according to claim 1, wherein, each of the tapping sections has an upper tapping surface facing the screw head, a lower tapping surface opposite to the upper tapping surface, and a tapping crest disposed at the junction of the upper and lower tapping surfaces. The tapping crest further defines a reference line perpendicular to the center line, and the angle between the upper tapping surface and the reference line is different from the angle between the lower tapping surface and the reference line.

25. The multi-functional screw according to claim 1, wherein, each of the threads is in a non-circular shape.

26. The multi-functional screw according to claim 1, wherein, the rod body is in a non-circular shape.

27. The multi-functional screw according to claim 1, wherein, each of the groove sections is formed on the drilling and milling section and extends in the direction of the screw head to increase the extension length of the groove section.

28. The multi-functional screw according to claim 1, wherein, the drilling unit is arranged in a spiral loop pattern with more than one turn to expand the distribution range of the plurality of tapping sections.

Images