TWI880471B - Screw - Google Patents

Abstract

A screw mainly includes a drill region connected to a shank. The drill region includes a drill body with an end portion and two opposite groove regions and two opposite drilling portions respectively formed on the drill body. Each drilling portion includes a cutting unit disposed on one side of each groove region and also includes a first join wall and a second join wall formed on the other side thereof. The cutting unit includes a connecting section protruding outwards from the groove region and a cutting edge section connected to the connecting section. The cutting edge sections of the opposite cutting units converge at the end portion. A first distance is defined between two joints where respective connecting sections meet respective cutting edge sections and is larger than an outer diameter of the shank. The first join wall has a slanted surface, which renders the thickness of the drill body to be gradually reduced towards the end portion when viewed from the cutting edge section. Accordingly, the groove regions cooperate with the outward protrusion and the gradually-reduced thickness of the drilling portions for reaming, executing a quick cutting operation and removal of chips, and attaining a stable fastening effect.

Description

Screws

The present invention relates to a screw, in particular to a screw with a special drilling structure.

Referring to FIG. 1 , the screw 1 includes a rod 11, a screw head 12 disposed at one end of the rod 11, and a plurality of screw threads 13 spirally disposed on the rod 11, wherein the other end of the rod 11 tapers to form a tip 14, and the rod 11 is provided with at least one groove 15; when in use, the screw head 12 is rotated to drive the screw threads 13 to drill into an object (not shown in the figure), and the groove 15 cuts the object, and the chips generated by the cutting are received. The cutting groove 15 is provided to complete the locking. However, the cutting effect of the cutting groove 15 is limited, and the wood fibers cannot be effectively cut. In addition, the 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. The chips are even easily over-accumulated and squeezed outward, resulting in cracking of the material. In view of this, the applicant of this case feels that the design still needs to be improved. After careful consideration, he has devoted himself to the research and development of the invention of this case.

Therefore, the purpose of the present invention is to provide a screw that can expand the hole, reduce the drilling resistance to facilitate rapid drilling, and achieve the effect of stable locking.

Therefore, the screw of the present invention comprises a screw head, a rod extending outward from the screw head and defining a center line, a thread unit spirally arranged on the rod, and a drilling portion connected to the rod, wherein the drilling portion comprises a drill body connected to the rod and having an end, two groove areas oppositely recessed on the drill body, and two drilling sections oppositely formed on the drill body; the end of the drill body is located in the opposite direction of the rod, and each groove area has a The rod body has at least one groove wall, and each drilling section includes a cutting portion at one side of the cutting groove area, a first connecting surface connected to the other side of the cutting groove area, and a second connecting surface formed between the first connecting surface and the other cutting groove area. 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 is connected to the cutting edge section of the other cutting portion. The blade segments intersect to form the end portion. Furthermore, a first distance is defined from the junction of the connecting segment of one cutting portion and the cutting blade segment to the junction of the connecting segment of the other cutting portion and the cutting blade segment. The outer periphery of the rod body also defines an outer diameter. 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. Therefore, when viewed from the cutting blade segment direction, the thickness of the drill body gradually decreases toward the end portion. According to the above, by using the outwardly protruding The cutting parts have a configuration in which a larger first distance and a gradually reduced thickness coexist, which is helpful to achieve a hole expansion effect during drilling and locking, and the object is cut by rotary cutting to quickly drive the drilling 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, so it is beneficial for the screw to quickly cut and remove chips from the object. The thread unit can continue the cutting operation and bite into the object, so as to achieve an overall stable locking and prevent the screw from loosening.

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

Referring to FIG. 2 and FIG. 3, a first preferred embodiment of the screw 3 of the present invention includes a screw head 31, a rod 32 extending outward from the screw head 31, a thread unit 33 spirally disposed on the rod 32, and a drilling portion 34 connected to the rod 32; wherein the shape of the screw head 31 can be adjusted according to demand, 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 312 is formed between any two adjacent chip grooves 311, which helps to allow the screw head 31 to be cut off from an object 6. The rod 32 is axially extended and defines a center line C1. The outer periphery of the rod 32 is further defined with an outer diameter OD. An auxiliary section 4 between the thread unit 33 and the screw head 31 can be added to the rod 32. The helix of the auxiliary section 4 is non-continuously connected, and the helix angle a2 of the auxiliary section 4 is different from the helix angle a1 of any thread 331 of the thread unit 33, so that the cutting operation can be continued to assist the thread unit 33 in the subsequent drilling operation.

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 screw threads 331, or a plurality of notches 332 may be provided on the screw threads 331, both of which can assist the screw thread unit 33 in cutting, that is, achieve an auxiliary cutting effect.

The drilling and tapping part 34 includes a drill body 341, two groove areas 342, and two drilling and tapping sections 343; referring to FIG. 2A and FIG. 5, 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 recessed 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 receiving space surrounded by at least one groove wall 3421, and the receiving space can be formed by a single groove wall 3421 or more than one groove wall 3421. In this embodiment, two groove walls 3421 are used as an example for explanation, that is, each groove area 342 may 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 may be connected to the groove area 342, that is, one end of the screw unit 33 may be connected to at least one groove wall 3421 of each groove area 342, so as to see the two groove walls 3421 shown in FIG. 2A, one end of the screw unit 33 may be connected to the first groove wall 3421a of each groove area 342, so as to accommodate chips and guide and discharge chips to avoid excessive accumulation of chips.

The two drilling sections 343 are formed on the drill body 341 and are arranged opposite to each other. Each drilling section 343 includes a cutting portion 3431 located on one side of the cutting groove area 342, a first connecting surface 3432 connected to the other side of the cutting groove area 342, and a second connecting surface 3433 connected to the first connecting surface 3432. The cutting portion 3431 has a connecting portion protruding outward from one side of the cutting groove area 342. In the present embodiment, when the groove region 342 is presented as having two groove walls 3421, the connecting section 34311 may protrude outward from the first groove wall 3421a, the first connecting surface 3432 may be connected to the second groove wall 3421b, and the second connecting surface 3433 may be formed between the first connecting surface 3432 and the other groove region 342. The first connecting surface 3432 of one drilling section 343 and the cutting portion 3431 of the other drilling section 343 are formed between the first connecting surface 3432 of one drilling section 343 and the cutting portion 3431 of the other drilling section 343; furthermore, in this embodiment, preferably, the connecting section 34311 can be in a curved shape (see FIG. 3 and FIG. 3A), and the second connecting surface 3433 can also be an inclined surface 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 to be inclined to the center line C1. The inclined plane of the center line C1, and the formation range of the first connection surface 3432 is larger than the formation range of the second connection surface 3433. Therefore, in general, when viewed from the cutting edge section 34312 (see the side view shown in Figure 4 and Figure 4A), the thickness T1 of the diamond body 341 gradually decreases toward the end 3411, that is, the diamond body 341 gradually becomes flatter from the rod body 32 to the end 3411.

Furthermore, the cutting portion 3431 also has a cutting blade section 34312 connected to the connecting section 34311, and the cutting blade section 34312 is extended obliquely in the direction opposite to the rod body 32. Therefore, according to the two drilling 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 3411. In this embodiment, the cutting blade section 34312 specifically can have a cutting edge 34312a extending obliquely in the direction opposite to the rod body 32. Therefore, the cutting blade 34312a of the one cutting blade section 34312 intersects with the cutting blade 34312a of the other cutting blade section 34312 to form the end 3411, so that the end 3411 It can be used as a drilling point; in addition, the cutting edge section 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 extending backward from the cutting edge 34312a (as shown in Figures 4 and 5). Therefore, in general, each cutting edge surface 34312b can be formed between the cutting edge 34312a of one drilling section 343 and the second connecting surface 3433 of another drilling section 343; moreover, 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 section 343.

In addition, when viewed from the cutting groove area 342 (see the front schematic diagram shown in FIG. 3 and FIG. 3A), 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 distance between the two connecting points P1 is The length is defined as a first distance L1, which is greater than the outer diameter OD of the rod body 32. That is, overall, the maximum width of the drilling section 343 (i.e., the first distance L1) is wider than the rod body 32, and the width of the drilling section 343 gradually decreases toward the end 3411; therefore, based on the coexistence of the first distance L1 and the inclination of the aforementioned first connecting surface 3432, the drilling section 34 as a whole presents a structure with a wide front and a flat side.

Referring to FIGS. 2 to 6 , the screw 3 is used to drill into 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 operation. At the beginning of the drilling operation, the internal fibers of the object 6 will be cut by the two cutting blade sections 34312, and the cutting blades 34312a and the cutting groove area 342 can be used to perform the cutting operation, which can reduce the friction between the object 6 and the drilling portion 34, and the fibers are cut and a drilling is formed. During the drilling process, the first distance L1 formed by the cutting portion 3431 of the drilling section 343 protruding outward can help expand the diameter of the drill hole to achieve the hole expansion effect. At the same time, the thickness T1 formed by the first connecting surface 3432 is a bevel and is gradually reduced, so that the drilling section 343 and the cutting groove area 342 can be drilled into the drill hole more easily, and a suitable space can be left for the chips obtained by cutting to be accommodated and moved, so that the drill body 341 can be quickly driven to drill and lock into the object 6, so the drilling section 34 can be stably engaged in the object 6 at the initial stage of drilling and locking.

During the drilling process of the drilling section 34, the fibers are cut by the cutting edge sections 34312 and the cutting groove area 342 to form chips, and the accommodation space formed by the first distance L1 and the cutting groove area 342 can be used to accommodate the chips and guide the chips to move, so that the situation of excessive accumulation of chips and outward extrusion to cause material cracking can be effectively avoided. 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 section 343 during drilling, so that the drilling resistance can be effectively reduced. At the same time, the screw unit 33 can also bite with the object 6 and maintain Continue to drill into the object 6 by rotary cutting. The chips move along the cutting grooves 342 and enter the rod body 32. Then they are discharged from the screw head 31 along the spiral direction of the screw thread unit 33. At this time, the chip grooves 311 and the blades 312 are used to scrape off the burrs remaining outside the drill hole of the object 6. Not only can the burrs be prevented from reducing the bonding between the screw head 31 and the object 6, but also a larger chip space can be provided (as shown in FIG. 7). According to the above configuration, the screw 3 as a whole can achieve the effects of rapid chip removal, improved drilling efficiency, and avoidance of cracking, and can also accommodate an appropriate amount of chips to achieve a stable locking and positioning and anti-loosening effect.

To summarize the above, the screw of the present invention mainly has a drilling portion including a drill body, and two cutting groove areas and two drilling sections formed on the drill body in a relative manner. In particular, each drilling section includes a cutting portion and a first connecting surface respectively arranged on both sides of each cutting groove area. The cutting portion has a connecting section protruding outward from the cutting groove area, and a cutting edge section connected to the connecting section. The connecting sections and the cutting edge sections of the two cutting portions define a first distance greater than the outer diameter of the rod body between the two connecting portions. The first connecting surface is an inclined surface. Therefore, when viewed from the cutting edge section, the thickness of the drill body gradually decreases toward the end of the drill body. The drilling sections protrude outward and the inclined first connection surface is set to make the drilling section present a wide and flat overall structural state with strength. Therefore, when drilling, it can not only expand the hole to facilitate rapid drilling and locking into the object, but also enhance the fast cutting, chip holding and chip guiding effects of the screw on the object, and also have the functions of stable locking and anti-loosening, so it can indeed achieve the purpose of the present invention.

However, the above is only to illustrate the preferred embodiment of the present invention, and should not be used to limit the scope of implementation of the present invention. In other words, 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 of the present invention patent.

(Learning)

1: Screw

11: Rod

12: screw head

13: Screw thread

14: Cutting edge

15: Cut groove

(This invention)

3: Screws

31:Screw head

32: Rod

33: Screw thread unit

34: Drilling Department

311: Chip groove

312: Blade

331: Screw thread

332: Missing slot

341: Diamond Body

342: Groove area

343: Drilling section

3411: End

3421: trench wall

3421a: First trench wall

3421b: Second trench wall

3431: Cutting Department

3432: First connection surface

3433: Second connection surface

34311:Connection segment

34312: Cutting edge section

34312a: Cutting edge

34312b: cutting edge surface

4: Auxiliary section

5: Raised ribs

a1: Helix angle of the screw thread unit

a2: Helical angle of the auxiliary section

C1: Centerline

L1: First distance

OD: rod outer diameter

P1: Joint

T1:Thickness

FIG. 1 is a schematic diagram of a conventional screw.

Figure 2 is a three-dimensional diagram of the first preferred embodiment of the present invention.

Figure 2A is an enlarged schematic diagram of the circled area X1 in Figure 2

Figure 3 is a front view of the first preferred embodiment of the present invention.

Figure 3A is an enlarged schematic diagram of the circled area X2 in Figure 3.

Figure 4 is a side view of the first preferred embodiment of the present invention.

Figure 4A is an enlarged schematic diagram of the circled area X3 in Figure 4.

Figure 5 is a bottom view of the first preferred embodiment of the present invention.

Figure 6 is a schematic diagram of the implementation of the first preferred embodiment of the present invention.

Figure 7 is a partial schematic diagram of the implementation of the first preferred embodiment of the present invention.

33: Screw thread unit

341: Diamond Body

342: Groove area

343: Drilling section

3411: End

3421: trench wall

3421a: First trench wall

3421b: Second trench wall

3431: Cutting Department

3432: First connection surface

3433: Second connection surface

34311:Connection segment

34312: Cutting edge section

34312a: Cutting edge

34312b: cutting edge surface

Claims (10)

A screw comprises a screw head, a rod extending outward from the screw head and defining a center line, a thread unit spirally arranged on the rod, and a drilling portion connected to the rod; wherein the outer periphery of the rod defines an outer diameter; wherein the drilling portion comprises a drill connected to the rod, two groove areas oppositely recessed on the drill, and two drilling sections oppositely formed on the drill, wherein the drill The rod body has an end portion in the opposite direction of the rod body, each of the groove cutting areas has at least one groove wall, each of the tapping sections 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 another groove cutting area, the cutting portion has a connecting section protruding outward from one side of the at least one groove wall, and a connecting section connected to the connecting section and inclined in the opposite direction of the rod body. The cutting edge section of the cutting portion is extended 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 junction of the connecting section of the one cutting portion and the cutting edge section to the junction of the connecting section of the other cutting portion and the cutting edge section, and the first distance is greater than the outer diameter of the rod body, the first connecting surface is connected to the other side of the at least one groove wall, and the second connecting surface is connected to the first connecting surface, so that the second The connecting surface is formed between the first connecting surface and the other cutting portion, so that the junction of the first connecting surface and the second connecting surface is located on one side of the center line. The first connecting surface is an inclined surface inclined to the center line, and the inclined surface is inclined toward the center line. At the same time, the forming range of the first connecting surface is larger than the forming range of the second connecting surface. Therefore, when viewed from the cutting edge section, the thickness of the drill body gradually decreases toward the end. According to the screw described in claim 1, each of the cutting groove 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. According to the screw described in claim 1, the connecting section is curved. According to the screw described in claim 1, 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, so that the cutting blade surface is formed between the cutting blade and the second connecting surface of another drilling section, and the cutting blade of one cutting blade section intersects with the cutting blade of another cutting blade section to form the end. According to the screw described in claim 1, the second connection surface is inclined to the center line. According to the screw described in claim 1, the thread unit is connected to all its groove areas. According to the screw described in claim 1, a plurality of concave arc-shaped chip grooves are provided on the bottom surface of the screw head, and a cutting edge is formed between any two adjacent chip grooves. According to the screw described in claim 1, an auxiliary section is additionally provided which is spirally arranged on the rod and located between the thread unit and the screw head. The spiral angle of the auxiliary section is different from the spiral angle of the thread unit, and the spiral of the auxiliary section is arranged in a non-continuous manner. According to the screw described in claim 1, the thread unit has a plurality of threads spirally arranged on the outer periphery of the rod, and a plurality of ribs protruding from the outer periphery of the rod are additionally arranged between the threads. According to the screw described in claim 1, the thread unit has a plurality of threads spirally arranged on the outer periphery of the rod, and a plurality of notches are provided on the threads.