Screw

Abstract

The invention discloses a screw. The screw comprises a rod body and a drilling and tapping part connected with the rod body. The drilling and tapping part comprises a drill body with an end part, two grooving areas and two drilling and tapping sections, the two grooving areas and the two drilling and tapping sections are oppositely formed on the drill body, each drilling and tapping section comprises a cutting part, a first connecting surface and a second connecting surface, the cutting part is respectively arranged on two sides of each grooving area, the cutting part is provided with a connecting section and a cutting edge section, the connecting section protrudes outwards from the grooving areas, and the cutting edge section is connected with the connecting section. The cutting edge sections of the two cutting parts intersect at the end part, a first distance larger than the outer diameter of the rod body is defined between the connecting parts of the connecting sections of the two cutting parts and the cutting edge sections, and the first connecting surface is an inclined surface, so that the thickness of the drill body is gradually reduced towards the end part when viewed from the direction of the cutting edge sections; the multiple grooving areas are matched with the multiple drilling and tapping sections to form the outward protruding and reducing thickness, so that the effects of chambering, rapid cutting, chip removal and stable locking can be achieved.

Description

Technical Field

[0001] The invention relates to a screw, in particular to a screw with a special drilling and tapping structure. Background Art

[0002] See also Figure 1 The existing screw 1 comprises a rod body 11, a screw head 12 arranged at one end of the rod body 11, and a plurality of screw teeth 13 spirally arranged on the rod body 11, wherein the other end of the rod body 11 tapers to form a tip 14, and at least one notch 15 is provided on the rod body 11; when in use, the screw head 12 is rotated to link the plurality of screw teeth 13 to drill and lock into an object such as wood (not shown in the figure), and the notch 15 cuts the object, and the chips generated by the cutting are accommodated in the notch 15 to complete the locking; however, the notch 15 has a limited cutting effect and cannot effectively cut wood fibers, and its chip removal effect and chip accommodation space are also limited, and the chips are easily blocked in the notch 15 due to insufficient chip removal, resulting in greater drilling and locking resistance, and even the chips are easily excessively accumulated and squeezed outward, resulting in cracking of the material; in view of this, the applicant of this case feels that there is still room for improvement in the existing design, and after careful consideration and research, the present invention is developed. Summary of the invention

[0003] Therefore, the object of the present invention is to provide a screw which can expand the hole, reduce the drilling and locking resistance to facilitate rapid drilling and locking, and achieve the effect of stable locking.

[0004] Therefore, the screw of the present invention comprises a screw head, a rod body extending outward from the screw head and defining a center line, a thread unit spirally arranged on the rod body, and a drilling and tapping part connected to the rod body, wherein the drilling and tapping part comprises a drill body connected to the rod body and having an end, two groove cutting areas oppositely recessed on the drill body, and two drilling and tapping sections oppositely formed on the drill body; the end of the drill body is located in the opposite direction of the rod body, each groove cutting area has at least one groove wall, and each drilling and tapping section comprises a cutting portion located on one side of the groove cutting area, a first connecting surface connected to the other side of the groove cutting area, and a first connecting surface formed between the first connecting surface and the other groove cutting area. Two connecting surfaces, the cutting portion has a connecting section protruding outward from one side of the cutting groove area, and a cutting edge section connected to the connecting section, the cutting edge section extends obliquely in the opposite direction of the rod body, so that the cutting edge section of one cutting portion intersects with the cutting edge section of the other cutting portion to form the end portion, and further, a first distance is defined from the connection point of the connecting section and the cutting edge section of the one cutting portion to the connection point of the connecting section and the cutting edge section of the other cutting portion, and the outer periphery of the rod body is also defined with an outer diameter, and the first distance is greater than the outer diameter of the rod body. The first connecting surface is an inclined surface inclined to the center line, so when viewed from the direction of the cutting edge section, the thickness of the drill body gradually decreases toward the end direction. According to the above, the configuration in which the multiple cutting parts protruding outward have a larger first distance and coexist with the aforementioned gradually decreasing thickness is helpful to achieve the hole expansion effect during drilling and locking, and the object is cut to quickly drive the drilling and tapping part to drill and lock into the object. At the same time, space is left for the chips obtained by rotary cutting to accommodate and move, which is beneficial to the fast cutting and chip removal effect of the screw on the object. The thread unit can continue the cutting operation and bite into the object, so as to achieve an overall stable locking device and prevent the screw from loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 This is a schematic diagram of the existing screws.

[0006] Figure 2 It is a stereogram of a first preferred embodiment of the present invention.

[0007] Figure 2A yes Figure 2 An enlarged schematic diagram of the circle X1

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

[0009] Figure 3A yes Figure 3 An enlarged schematic diagram of the circled area X2.

[0010] Figure 4 It is a side view of a first preferred embodiment of the present invention.

[0011] Figure 4A yes Figure 4 An enlarged schematic diagram of the circled area X3.

[0012] Figure 5 It is a bottom view of the first preferred embodiment of the present invention.

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

[0014] Figure 7 It is a partial schematic diagram of an implementation form of the first preferred embodiment of the present invention.

[0015] Explanation of symbols:

[0016] (Prior Art)

[0017] 1: Screw

[0018] 11: Rod body

[0019] 12: Screw head

[0020] 13: Screw thread

[0021] 14: Cutting Edge

[0022] 15: Cut groove

[0023] (The present invention)

[0024] 3: Screws

[0025] 31: Screw head

[0026] 32: Rod body

[0027] 33: Screw thread unit

[0028] 34: Drilling and tapping department

[0029] 311: Chip groove

[0030] 312: Blade

[0031] 331: Screw thread

[0032] 332: Missing slot

[0033] 341: Drill body

[0034] 342: Grooving area

[0035] 343: Drilling and Tapping

[0036] 3411: End

[0037] 3421: Ditch Wall

[0038] 3421a: First trench wall

[0039] 3421b: Second trench wall

[0040] 3431: Cutting Department

[0041] 3432: First connection surface

[0042] 3433: Second connection surface

[0043] 34311: Connection segment

[0044] 34312: Cutting edge section

[0045] 34312a: Cutting Edge

[0046] 34312b: cutting edge

[0047] 4: Auxiliary segment

[0048] 5: Raised ribs

[0049] a1: Helix angle of the screw thread unit

[0050] a2: Helix angle of the auxiliary segment

[0051] C1: Centerline

[0052] L1: First distance

[0053] OD: outer diameter of the rod

[0054] P1: Joint

[0055] T1: Thickness DETAILED DESCRIPTION

[0056] The foregoing and other technical contents, features and effects of the present invention will be clearly understood in the following detailed description of the preferred embodiments with reference to the drawings.

[0057] See also Figure 2 , Figure 3, a first preferred embodiment of the screw 3 of the present invention, the screw 3 comprises a screw head 31, a rod body 32 extending outward from the screw head 31, a screw thread unit 33 with a spiral ring disposed on the rod body 32, and a drilling and tapping portion 34 connected to the rod body 32; wherein the shape of the screw head 31 can be adjusted according to needs, for example: a plurality of concave arc-shaped chip grooves 311 can be provided on the bottom surface of the screw head 31, and a blade portion 312 is formed between any two adjacent chip grooves 311, which helps the screw head 31 and an object 6 is tightly combined; furthermore, the rod body 32 extends axially and defines a center line C1, and the outer periphery of the rod body 32 is further defined with an outer diameter OD, and an auxiliary section 4 located between the screw unit 33 and the screw head 31 can be added to the rod body 32 in a timely manner, and the helix angle a2 of the auxiliary section 4 is different from the helix angle a1 of any screw 331 of the screw unit 33, so that the cutting operation can be continued, so as to assist the screw unit 33 in the subsequent drilling and locking operation.

[0058] Furthermore, the screw thread unit 33 has a plurality of screw threads 331 spirally arranged on the outer periphery of the rod body 32, and a plurality of ribs 5 protruding on the outer periphery of the rod body 32 may be additionally provided between the plurality of screw threads 331, or a plurality of notches 332 may be provided on the plurality of screw threads 331, both of which can assist the screw thread unit 33 in cutting, that is, achieve an auxiliary cutting effect.

[0059] The drilling and tapping part 34 includes a drilling body 341, two cutting groove areas 342, and two drilling and tapping sections 343; Figure 2A and Figure 5 , 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 an end 3411 opposite to the rod body 32; furthermore, the two groove areas 342 are formed on the drill body 341 and are arranged opposite to each other, and each groove area 342 has at least one groove wall 3421, so that the groove area 342 can be used as a accommodating space surrounded by at least one groove wall 3421, and a single groove wall 3421 or more than one groove wall 3421 can be formed. 21 can be surrounded to form the accommodation space, and in this embodiment, two groove walls 3421 are used as an example for explanation, that is, each groove area 342 can have a first groove wall 3421a connected to the outer periphery of the drill body 341, and a second groove wall 3421b connected to the first groove wall 3421a; furthermore, the screw unit 33 can be connected to the groove area 342, that is, one end of the screw unit 33 can be connected to at least one groove wall 3421 of the groove area 342, so Figure 2A From the two groove walls 3421 shown, one end of the screw unit 33 can be connected to the first groove wall 3421a of the groove area 342 to accommodate chips and guide the chips to avoid excessive accumulation of chips.

[0060] The two drilling and tapping sections 343 are formed on the drill body 341 and are arranged opposite to each other. Each drilling and tapping section 343 includes a cutting portion 3431 located on one side of the groove cutting area 342, a first connecting surface 3432 connected to the other side of the groove cutting area 342, and a second connecting surface 3433 connected to the first connecting surface 3432; wherein the cutting portion 3431 has a connecting section 34311 protruding outward from one side of the groove cutting area 342, and in this embodiment, when the groove cutting area 342 is presented as having two groove walls 3421, the connecting section 34311 is provided at the bottom of the groove cutting area 342. The connecting section is in an outwardly extending state, that is, the connecting section 34311 can protrude outward from the first groove wall 3421a, the first connecting surface 3432 is connected to the second groove wall 3421b, and the second connecting surface 3433 can be formed between the first connecting surface 3432 and the other groove cutting area 342, especially as shown in the figure, it can be formed between the first connecting surface 3432 of one drilling and tapping section 343 and the cutting portion 3431 of the other drilling and tapping section 343; furthermore, in this embodiment, preferably, the connecting section 34311 can be in a curved shape (refer to Figure 3 and Figure 3A , which may be in a concave arc shape), and the second connecting surface 3433 may also be an inclined surface, so as to be inclined to the center line C1, which is more conducive to increasing the strength of the structure; in addition, the first connecting surface 3432 is an inclined surface inclined to the center line C1, so as a whole, when viewed from the cutting edge section 34312 (see Figure 4 and Figure 4A As shown in the side view, the thickness T1 of the drill body 341 gradually decreases toward the end 3411 , that is, the drill body 341 gradually becomes flatter from the rod body 32 toward the end 3411 .

[0061] Furthermore, the cutting portion 3431 further includes a cutting blade section 34312 connected to the connecting section 34311, and the cutting blade section 34312 extends obliquely in the direction opposite to the rod body 32. Therefore, according to the two drilling and tapping sections 343, the cutting blade section 34312 of one cutting portion 3431 intersects with the cutting blade section 34312 of the other cutting portion 3431 to form the end portion 3411. In this embodiment, the cutting blade section 34312 may specifically include a cutting blade 34312a extending obliquely in the direction opposite to the rod body 32. Therefore, the cutting edge 34312a of one cutting edge segment 34312 intersects with the cutting edge 34312a of the other cutting edge segment 34312 to form the end 3411, so that the end 3411 can be used as a drilling point; in addition, the cutting edge segment 34312 can also have a cutting edge surface 34312b connected to the cutting edge 34312a, and the cutting edge surface 34312b extends in the opposite direction of the cutting groove area 342, that is, the cutting edge surface 34312b is a wall surface (such as a wall surface) extending backward from the cutting edge 34312a. Figure 4 , Figure 5As shown in the figure, as a whole, each cutting edge surface 34312b can be formed between the cutting edge 34312a of one drilling and tapping section 343 and the second connecting surface 3433 of another drilling and tapping section 343; further, the cutting edge surface 34312b can be inclined to the center line C1, which is also beneficial to strengthen the structure of the cutting edge 34312a to increase the cutting strength of the drilling and tapping section 343.

[0062] In addition, when viewed from the direction of the groove area 342 (see Figure 3 , Figure 3A As shown in the front schematic diagram, the connecting section 34311 and the cutting edge section 34312 of one cutting portion 3431 are connected at a connecting point P1 (as shown in the figure, it can be the connecting point between the connecting section 34311 and the cutting edge 34312a), and the connecting section 34311 and the cutting edge section 34312 of the other cutting portion 3431 are connected at another connecting point P1, and the length between the two connecting points P1 is defined as a first distance L1, and the first distance L1 is greater than the outer diameter OD of the rod body 32, that is, as a whole, the maximum width of the drilling and tapping section 343 (that is, the first distance L1) is wider than that of the rod body 32, and the width of the drilling and tapping section 343 gradually decreases toward the end 3411; therefore, based on the coexistence of the first distance L1 and the inclined coexistence of the aforementioned first connecting surface 3432, the drilling and tapping portion 34 as a whole presents a structure with a wide front and a flat side.

[0063] See also Figures 2 to 6 The screw 3 is used to drill and lock an object 6, and the object 6 can be made of materials such as iron plate or wood. Here, a piece of wood is used as the object 6. When in use, the end portion 3411 is first pressed against the surface of the object 6, and the screw head 31 is rotated to perform a drilling and locking operation. In the early stage of the drilling and locking operation, the internal fibers of the object 6 will be cut by the two cutting blade sections 34312, and the cutting operation can be performed using the multiple cutting blades 34312a and the cutting groove area 342, which can reduce the friction between the object 6 and the drilling and tapping portion 34, and in the process of cutting the fibers and forming a drill hole, In the figure, the first distance L1 formed by the cutting portions 3431 of the multiple drilling and tapping sections 343 protruding outward can help to expand the aperture of the drill hole to achieve the hole expansion effect. At the same time, the thickness T1 formed by the multiple first connecting surfaces 3432 being inclined surfaces is gradually reduced, so that the drilling and tapping sections 343 and the cutting groove area 342 are easier to drill into the drill hole, and appropriate space can be left for the chips obtained by cutting to accommodate and move, so that the drill body 341 can be quickly driven to drill and lock into the object 6, so that the drilling and tapping portion 34 can be stably engaged in the object 6 at the initial stage of drilling and locking.

[0064] During the drilling and locking process of the drilling and tapping portion 34, the plurality of fibers are cut by the plurality of cutting blade sections 34312 and the cutting groove area 342 to form chips, and the accommodation space formed by the first distance L1 and the plurality of the cutting groove areas 342 can be used to accommodate the chips and guide the chips to move, so that the objects can be effectively prevented from being cracked due to excessive accumulation and outward pushing of the chips. In addition, when the screw unit 33 and the cutting groove area 342 are connected, the screw unit 33 can enter the object 6 along the spiral track formed by the drilling and tapping section 343 when drilling. Therefore, the drill locking resistance can be effectively reduced. At the same time, the screw unit 33 can also be engaged with the object 6 and continuously rotary cut to drill into the object 6. As for the multiple chips, they move along the multiple cutting groove areas 342, enter the rod body 32, and then are discharged from the screw head 31 outward along the spiral direction of the screw unit 33. At this time, the multiple chip grooves 311 and the blade 312 are also used to scrape off the burrs remaining outside the drill hole of the object 6, which not only prevents the burrs from reducing the bonding between the screw head 31 and the object 6, but also has a larger chip space (such as Figure 7 According to the above configuration, the screw 3 as a whole can achieve the effect of fast chip removal, improve drilling and locking efficiency, and prevent objects from cracking. It can also accommodate an appropriate amount of chips to achieve a stable locking position, thereby preventing the screw 3 from loosening to achieve an anti-loosening effect.

[0065] To summarize the above, the screw of the present invention mainly comprises a drilling and tapping part including a drill body, and two groove cutting areas and two drilling and tapping sections formed on the drill body in a relative manner, and in particular, each drilling and tapping section comprises a cutting part and a first connecting surface respectively arranged on both sides of each groove cutting area, the cutting part comprises a connecting section protruding outward from the groove cutting area, and a cutting edge section connected to the connecting section, and a first distance greater than the outer diameter of the rod body is defined between two connecting parts of the connecting section and the cutting edge section of the two cutting parts, and the first connecting surface is designed as an inclined surface, so when viewed from the direction of the cutting edge section, the thickness of the drill body gradually decreases toward the end direction of the drill body, and the drilling and tapping part presents an overall structural state of being both wide and flat, and also having strength through the outward protrusion of a plurality of the drilling and tapping sections and the arrangement of the inclined first connecting surface, so that when drilling, not only can the hole be expanded to facilitate rapid drilling and locking into the object, but also the rapid cutting, chip accommodating and chip guiding effects of the screw on the object can be enhanced, and the screw also has the functions of stable locking and anti-loosening, so the purpose of the present invention can be achieved.

[0066] The above description is only for illustrating the preferred embodiments of the present invention, and it cannot be used to limit the scope 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 contents of the invention specification should still fall within the scope covered by the patent of the present invention.

Claims

1. A screw comprising a screw head, a rod 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; in, The outer periphery of the rod body is defined by an outer diameter; the characteristics are: The drilling and tapping part includes a drill body connected to the rod body, two groove cutting areas that are oppositely recessed on the drill body, and two drilling and tapping sections that are oppositely formed on the drill body, wherein the drill body has an end portion in the opposite direction of the rod body, each groove cutting area has at least one groove wall, and each drilling and tapping section includes a cutting portion located on one side of the groove cutting area, a first connecting surface connected to the other side of the groove cutting area, and a second connecting surface formed between the first connecting surface and the other groove cutting area, and the cutting portion has a connecting surface protruding outward from one side of the groove cutting area. A connecting section, and a cutting edge section connected to the connecting section and extending obliquely in the opposite direction of the rod body, so that the cutting edge section of one cutting portion intersects with the cutting edge section of the other cutting portion to form the end portion, and a first distance is defined from the connection point of the connecting section and the cutting edge section of the one cutting portion to the connection point of the connecting section and the cutting edge section of the other cutting portion, the first distance is greater than the outer diameter of the rod body, the first connecting surface is an inclined surface inclined to the center line, so when viewed from the cutting edge section direction, the thickness of the drill body gradually decreases toward the end direction.

2. The screw according to claim 1, It is characterized in that Each of the groove cutting areas has a first groove wall connected to the outer periphery of the drill body and a second groove wall connected to the first groove wall. The connecting section of the cutting portion protrudes outward from the first groove wall, and the first connecting surface is connected to the second groove wall.

3. The screw according to claim 1, It is characterized in that The connecting section is in a curved shape.

4. The screw according to claim 1, It is characterized in that The cutting blade section has a cutting blade extending obliquely in the direction opposite to the rod body, and a cutting blade surface connected to the cutting blade and extending in the direction opposite to the cutting groove area. The cutting blade of one cutting blade section intersects with the cutting blade of another cutting blade section to form the end.

5. The screw according to claim 1, It is characterized in that The second connecting surface is inclined to the center line.

6. The screw according to claim 1, It is characterized in that The screw thread unit is connected to a groove area thereof.

7. The screw according to claim 1, It is characterized in that A plurality of concave arc-shaped chip grooves are arranged on the bottom surface of the screw head, and a cutting edge portion is formed between any two adjacent chip grooves.

8. The screw according to claim 1, It is characterized in that An auxiliary section is additionally provided which is spirally arranged on the rod body and located between the screw thread unit and the screw head. The spiral angle of the auxiliary section is different from the spiral angle of the screw thread unit.

9. The screw according to claim 1, It is characterized in that The screw thread unit comprises a plurality of screw threads which are spirally arranged on the outer periphery of the rod body, and a plurality of convex ribs which are convexly arranged on the outer periphery of the rod body are additionally arranged between the plurality of screw threads.

10. The screw according to claim 1, It is characterized in that The screw thread unit comprises a plurality of screw threads which are spirally arranged on the outer peripheral edge of the rod body, and a plurality of notches are formed on the plurality of screw threads.

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