Fiber cut wood screw

Abstract

This utility model discloses a fiber-cutting wood drill screw, comprising: a screw head, a screw shank extending rearward from the screw head, and a self-tapping tip formed at the rear end of the screw shank. The bottom wall of the screw head has an anti-slip structure, the surface of the screw shank has at least two spaced threaded segments, and the surface of the self-tapping tip has at least two sets of staggered spiral cutting edges. Through the above methods, the tip of this utility model's fiber-cutting wood drill screw uses double-threaded cutting edges to cut wood fibers, preventing cracking at the source; the screw shank uses double threads with different pitches, enhancing the tightening force and reducing the risk of cracking, while also preventing vibration-induced loosening; the screw head has a multi-tooth anti-slip structure, achieving double anti-loosening, and improving the reliability and safety of wood fastening.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a fiber-cutting wood screw. Background Technology

[0002] Wood, as a material with tightly interwoven natural fibers, has excellent mechanical properties and a natural texture, but it also presents challenges during processing, especially when screws are screwed in, as the fibers are easily torn and cracked.

[0003] Current wood screw structures have limitations: to reduce initial screwing resistance, screw heads generally adopt a sharp tapered structure, and the pointed end is mostly designed with a single thread.

[0004] During the screwing process, this structure relies primarily on the forced compression and tearing of the wood fibers by the threaded teeth for propulsion, rather than on orderly separation through cutting. This can easily lead to incomplete fiber cutting, causing the wood to crack and compromising its structural integrity.

[0005] Furthermore, uncut fiber bundles will gradually undergo plastic deformation or fatigue fracture, causing the contact pressure between the screw and the wood to continuously decrease, which can easily lead to loosening over time. Utility Model Content

[0006] The main technical problem solved by this utility model is to provide a fiber-cutting wood screw. The pointed head adopts a double-threaded cutting edge, which can cut wood fibers and prevent cracking from the source. The screw part adopts double threads with different pitches to enhance the fastening force and reduce the risk of cracking, and can also prevent vibration from loosening. The screw head has a multi-tooth anti-slip structure to achieve double anti-loosening and improve the reliability and safety of wood fastening.

[0007] To solve the above-mentioned technical problems, the present invention provides a fiber-cutting wood screw, comprising: a screw head, a screw shank extending rearward from the screw head, and a self-tapping tip formed at the rear end of the screw shank. The bottom wall of the screw head has an anti-slip structure, the screw surface has at least two spaced threaded segments, and the self-tapping tip surface has at least two sets of staggered spiral cutting edges.

[0008] In a preferred embodiment of the present invention, the screw head is frustum-shaped, and the top of the screw head is provided with a tool engagement portion, which is a plum blossom groove, a star groove, or a cross groove.

[0009] In a preferred embodiment of this utility model, the anti-slip structure is a radial toothed structure evenly distributed circumferentially along the bottom of the screw head.

[0010] In a preferred embodiment of the present invention, the threaded segment on the screw includes a first threaded segment and a second threaded segment spaced apart. The pitch of the first threaded segment is A, and the pitch of the second threaded segment is B. The pitches of the two threaded segments are different.

[0011] In a preferred embodiment of this utility model, the pitch of the first threaded segment is 1.8-2.3 mm.

[0012] In a preferred embodiment of this utility model, the pitch of the first threaded segment is 2.0 mm.

[0013] In a preferred embodiment of this utility model, the pitch of the second threaded segment is 2.4-3.0 mm.

[0014] In a preferred embodiment of this utility model, the pitch of the second thread segment is 2.6 mm.

[0015] In a preferred embodiment of the present invention, the self-tapping tip's helical cutting edge includes a first set of helical cutting edges and a second set of helical cutting edges. One end of the first set of helical cutting edges continuously transitions to one end of the aforementioned second threaded section of the screw, and the helical direction of the first set of helical cutting edges is the same as that of the second threaded section.

[0016] In a preferred embodiment of the present invention, the helical direction of the second set of helical cutting edges is staggered with that of the first set of helical cutting edges, and the helical angle of the second set of helical cutting edges is greater than that of the first set of helical cutting edges.

[0017] The beneficial effects of this utility model are: The pointed tip features a double-threaded cutting edge structure, which can effectively cut wood fibers and prevent wood from cracking at the source. The screw section adopts a double thread structure with different tooth pitches, which can make the stress distribution of the thread in the wood more uniform, enhance the fastening force while reducing the risk of cracking, and prevent the screw from loosening when the screw is subjected to vibration. The screw head has a multi-tooth anti-slip structure, which can play a role in loosening and anti-slip, achieving double anti-loosening protection and improving the reliability and safety of wood fastening. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of a preferred embodiment of the fiber-cutting wood drill screw of this utility model; Figure 2 yes Figure 1 A magnified view of part C; Figure 3 This is a front view of a preferred embodiment of the fiber-cutting wood screw of this utility model; Figure 4 This is a left view of a preferred embodiment of the fiber-cutting wood screw of this utility model; Figure 5 This is a right view of a preferred embodiment of the fiber-cutting wood screw of this utility model; Figure 6 This is a cross-sectional view of a preferred embodiment of the fiber-cutting wood screw of this utility model; The components in the attached diagram are labeled as follows: 10. Screw head; 11. Tool joint; 12. Anti-slip structure; 20. Screw; 21. First threaded section; 22. Second threaded section; 30. Self-tapping tip; 31. First set of helical cutting edges; 32. Second set of helical cutting edges. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] This utility model relates to a preferred embodiment of a fiber-cutting wood screw.

[0022] Please see Figures 1 to 6 The fiber-cutting wood screw includes a screw head 10, a screw 20, and a self-tapping tip 30. The screw 20 is formed by extending the screw head 10 backward, and the self-tapping tip 30 is formed at the rear end of the screw. The three work together to achieve an efficient and stable connection to the wood.

[0023] Specifically, the first part is the screw head 10, which is truncated cone-shaped with a tool engagement part 11 at the top and an anti-slip structure 12 on the bottom wall.

[0024] In one exemplary embodiment, the tool engagement portion 11 is one of a plum blossom groove, a star groove, or a cross groove, etc., to adapt to different types of drive tools and meet diverse operational needs.

[0025] In one exemplary embodiment, the anti-slip structure 12 is a radially toothed structure evenly distributed circumferentially along the bottom of the screw head, forming a complete annular anti-slip band. Specifically, the radially toothed structure includes multiple straight teeth spaced at equal angles, with the tooth grooves arranged radially and evenly, which can prevent slippage under high load conditions.

[0026] Secondly, there is the screw 20, whose surface has at least two spaced threaded sections. The combination of different threaded sections can optimize the performance of the screw in wood.

[0027] In one exemplary embodiment, the threaded segments on the screw 20 include a first threaded segment 21 and a second threaded segment 22 spaced apart, the two threaded segments having different pitches.

[0028] Preferably, the pitch A of the first thread segment 21 is 1.8-2.3 mm, more preferably 2.0 mm.

[0029] Preferably, the pitch B of the second thread segment 22 is 2.4-3.0 mm, more preferably 2.6 mm.

[0030] The first thread section 21 with a small pitch provides a higher thread contact density, forming a high-density engagement with the wood and enhancing the initial tightening force. The second thread section 22 with a large pitch reduces the screwing resistance and improves installation efficiency. The combination of the two can make the stress distribution of the thread in the wood more uniform and reduce the risk of wood cracking.

[0031] In addition, when the screw is subjected to vibration, the two threads will have a tendency to move in opposite directions due to the difference in pitch. This bidirectional force cancels each other out and forms a dynamic balance, preventing the screw from loosening.

[0032] Furthermore, there is the self-tapping tip 30, whose surface is provided with at least two sets of spiral cutting blades arranged in an interlaced manner, which can efficiently cut wood fibers and improve the ease of installation.

[0033] In an exemplary embodiment, the self-tapping tip's helical cutting edge includes a first set of helical cutting edges 31 and a second set of helical cutting edges 32. One end of the first set of helical cutting edges 31 is continuously connected to one end of the aforementioned second threaded section 22 of the screw, and its helical direction is the same as that of the second threaded section 22. This continuity ensures the smooth transmission of cutting force.

[0034] Furthermore, the helical direction of the second set of helical cutting edges 32 is staggered with that of the first set of helical cutting edges 31. The staggered arrangement of the two cutting edges creates a scissor effect, which can effectively cut wood fibers.

[0035] Furthermore, the helix angle of the second set of helical cutting edges 32 is greater than that of the first set of helical cutting edges 31, and the larger helix angle improves chip removal performance.

[0036] The beneficial effects of this new fiber-cutting wood screw are: The pointed tip features a double-threaded cutting edge structure, which can effectively cut wood fibers and prevent the wood from cracking. The screw section adopts a double thread structure with different tooth pitches, which can make the stress distribution of the thread in the wood more uniform, enhance the fastening force while reducing the risk of cracking, and prevent the screw from loosening when the screw is subjected to vibration. The screw head has a multi-tooth anti-slip structure, which can play a role in loosening and anti-slip, achieving double anti-loosening protection.

[0037] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A fiber-cutting wood screw, characterized in that, include: The screw head, the screw rod extending rearward from the screw head, and the self-tapping tip formed at the rear end of the screw rod. The bottom wall of the screw head has an anti-slip structure, the screw surface has at least two spaced threaded segments, and the self-tapping tip surface has at least two sets of staggered spiral cutting edges.

2. The wood screw according to claim 1, wherein The screw head is truncated cone-shaped, and the top of the screw head is provided with a tool engagement part, which is a plum blossom groove, a star groove or a cross groove.

3. The wood screw according to claim 1, wherein The anti-slip structure is a radial toothed structure evenly distributed circumferentially along the bottom of the screw head.

4. The wood screw according to claim 1, wherein The threaded section on the screw includes a first threaded section and a second threaded section spaced apart. The pitch of the first threaded section is A, and the pitch of the second threaded section is B. The pitches of the two threaded sections are different.

5. The fiber-cutting wood screw according to claim 4, characterized in that, The pitch of the first threaded section is 1.8-2.3 mm.

6. The wood screw according to claim 5, wherein The pitch of the first threaded section is 2.0 mm.

7. The wood screw according to claim 4, wherein The pitch of the second threaded section is 2.4-3.0 mm.

8. The wood screw according to claim 7, wherein The pitch of the second threaded section is 2.6 mm.

9. The wood screw according to claim 4, wherein The self-tapping tip's helical cutting edge includes a first set of helical cutting edges and a second set of helical cutting edges. One end of the first set of helical cutting edges continuously transitions to one end of the second threaded section of the aforementioned screw, and the helical direction of the first set of helical cutting edges is the same as that of the second threaded section.

10. The wood screw according to claim 9, wherein The helical direction of the second set of helical cutting edges is staggered with that of the first set of helical cutting edges, and the helical angle of the second set of helical cutting edges is greater than that of the first set of helical cutting edges.

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