Deck screws

Abstract

This utility model discloses a deck screw, including a head, a shank, and a tip. The shank is threaded, and the tip has two opposing notches and a cutting surface between the two notches. The notches extend from the tip of the tip towards the shank. The deck screw of this utility model employs a four-lobed alternating protrusion and groove structure on the tip. The cutting surface and notches form a circumferentially distributed and staggered cutting edge, which improves cutting efficiency and chip removal capacity, reduces stress concentration in the wood, and effectively prevents wood cracking. Secondly, pre-drilling is possible during drilling; that is, a small hole is drilled from the tip before thread drilling, instead of directly using thread drilling. This arrangement ensures that the tip is already embedded in the pre-drilled hole when entering the thread drilling stage. Pre-drilling prevents wood cracking, reduces screw misalignment, and thus reduces the likelihood of the screw flying off due to direct thread drilling, improving stability during use.

Description

Technical Field

[0001] This utility model belongs to the field of fastener technology, specifically relating to a deck screw. Background Technology

[0002] Deck screws are widely used in the assembly and fixing of wooden structures, especially in outdoor flooring, fences, and wooden building construction. The threads of deck screws are typically single-helix extending to the tip of the screw. Without pre-drilling, improper drilling angles or high wood density can easily cause stress concentration during screwing into the wood, leading to cracks along the grain and affecting structural stability and aesthetics.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a new type of deck screw that effectively prevents cracking and mushroom effect by improving the design of the screw tip and thread, making it suitable for efficient fastening of wooden structures.

[0005] To achieve the above objectives, a specific embodiment of this utility model provides a deck screw, including a screw head, a screw shank, and a screw tip. The screw shank is provided with threads, and the screw tip is provided with two oppositely arranged notches and a cutting surface provided between the two notches. The notches extend from the tip of the screw tip toward the screw shank.

[0006] In one or more embodiments of this utility model, the nail tip includes an elliptical conical pre-drilled hole and a connecting part connecting the pre-drilled hole and the nail rod, and the notch and cut are provided on the connecting part.

[0007] In one or more embodiments of the present invention, the notch includes a first plane extending from the surface of the pre-drilled hole toward the axis of the nail rod, and a second plane connected to the first plane from the surface of the pre-drilled hole, wherein the included angle between the first plane and the second plane is an obtuse angle.

[0008] In one or more embodiments of the present invention, the area of ​​the first plane is smaller than the area of ​​the second plane, and / or the notch further includes an arc-shaped guide surface that connects the first plane and the second plane and extends to the surface of the connecting portion.

[0009] In one or more embodiments of this utility model, the thread includes a drilled thread near the nail tip and a reverse thread located between the drilled thread and the nail head, wherein the helical direction of the reverse thread is opposite to that of the drilled thread.

[0010] In one or more embodiments of this utility model, the pitch of the reverse thread is smaller than the pitch of the drilled thread.

[0011] In one or more embodiments of this utility model, the drilled thread is provided with a plurality of notches for chip removal.

[0012] In one or more embodiments of this utility model, the notches are arranged sequentially along the drilling rotation direction in the direction from the nail head to the nail tip, and the notches form a spiral chip removal channel.

[0013] In one or more embodiments of this utility model, the drilled thread is provided with multiple chip removal channels.

[0014] In one or more embodiments of this utility model, a serrated protrusion is provided on the end face of the nail head facing the nail rod. The protrusion includes a plurality of inclined surfaces and a vertical surface connecting two inclined surfaces. The inclined surfaces face the screwing direction of the deck screw, and the vertical surface is parallel to the axial direction of the nail rod and faces away from the screwing direction of the deck screw.

[0015] Compared with existing technologies, the deck screw of this invention adopts a four-lobed alternating protrusion and groove structure on the nail tip. The cutting surface and notch form a circumferentially distributed and staggered cutting edge, which can improve cutting efficiency and chip removal ability when drilling into wood, reduce stress concentration in the wood, and effectively prevent wood cracking. Secondly, pre-drilling can be performed during drilling. That is, the nail tip first drills a small hole in the target object such as the wood board, and then the threaded hole is drilled, instead of directly using the threaded hole. This setting means that the nail tip is already embedded in the pre-drilled hole when entering the threaded hole stage. Pre-drilling can reduce wood cracking and screw misalignment, thereby reducing the possibility of the screw flying off due to direct threaded drilling, and improving stability during use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a deck screw in one embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of a nail head in one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the nail tip in one embodiment of the present invention.

[0020] Explanation of key figure labels:

[0021] 100-Deck bolt, 10-Head, 11-Protrusion, 111-Bevel, 112-Vertical surface, 20-Shaft, 30-Point, 31-Notch, 311-First plane, 312-Second plane, 313-Third plane, 32-Cut surface, 33-Pre-drilled hole, 34-Connecting part, 41-Drilled thread, 42-Reverse thread, 43-Notch. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0023] like Figure 1-3 As shown, in one embodiment of the present invention, the deck screw 100 includes a screw head 10, a screw shank 20 and a conical screw tip 30. The screw shank 20 is provided with threads, and two oppositely arranged notches 31 are formed on the screw tip 30, as well as a cutting surface 32 connecting the two notches 31. The notches 31 extend from the tip of the screw tip 30 toward the screw shank 20.

[0024] In this embodiment, the deck screw 100 does not employ a conventional tapered tip structure. Instead, it uses a four-lobed alternating protrusion and groove structure on the screw tip 30. The cutting surface 32 and the notch 31 form a circumferentially distributed and staggered cutting edge, which improves cutting efficiency and chip removal capacity when drilling into wood, reduces stress concentration in the wood, and effectively prevents wood cracking. Furthermore, pre-drilling is possible during drilling. That is, the screw tip 30 first drills a small hole in the target object such as the wood board before thread drilling, instead of directly using thread drilling. This arrangement ensures that the screw tip 30 is already embedded in the pre-drilled hole when entering the thread drilling stage. Pre-drilling can prevent wood cracking, reduce screw misalignment, and thus reduce the possibility of screw flying off due to direct thread drilling, improving stability during use.

[0025] In one embodiment, the nail tip 30 includes an elliptical conical pre-drilled hole portion 33 and a connecting portion 34 connecting the pre-drilled hole portion 33 and the nail shank 20. A notch 31 and a cutting surface 32 are provided on the pre-drilled hole portion 33. In this embodiment, the deck screw 100 does not use a regular conical tip, but rather an elliptical cone. Compared to a regular conical tip, the elliptical cone tip can reduce the contact area with the target object, thereby reducing the force on the nail tip 30 and making it easier to pre-drill holes in the target object.

[0026] Specifically, the notch 31 includes a first plane 311 extending in the opposite direction to the axis of the nail shank 20 from the surface of the pre-drilled hole 33, and a second plane 312 connected to the first plane 311 from the surface of the pre-drilled hole 33, with an obtuse angle between the first plane 311 and the second plane 312. During pre-drilling, the debris scraped off by the connecting edge of the first plane 311 and the cutting surface 32 can move along the first plane 311 and the second plane 312 and leave the notch 31. The obtuse angle between the first plane 311 and the second plane 312 can reduce the amount of debris remaining in the notch 31 and prevent debris from accumulating in the notch 31.

[0027] In one embodiment, the first plane 311 and the second plane 312 are mainly triangular, and the area of ​​the first plane 311 is smaller than the area of ​​the second plane 312. Therefore, the entire notch 31 is relatively shallow, which can further reduce the amount of waste residue remaining in the notch 31.

[0028] The notch 31 also includes an arc-shaped guide surface 313 that connects the first plane 311 and the second plane 312 and extends to the connecting portion 34. The arc-shaped guide surface 313 can assist in the discharge of waste chips in the notch 31, speed up the chip discharge speed, and prevent waste chips from accumulating in the notch 31.

[0029] Preferably, the thread on the deck screw 100 extends to the connecting part 34 and to the side of the notch 31 away from the tip of the nail tip 30, that is, the thread and the pre-drilled hole 33 are seamlessly connected. When the entire pre-drilled hole 33 is inserted into the target, the thread on the connecting part 34 and the rear nail rod 20 can enter the hole for drilling.

[0030] The threads on the nail shank 20 include a drilled thread 41 near the nail tip 30 and a reverse thread 42 located between the drilled thread 41 and the nail head 10. The reverse thread 42 and the drilled thread 41 have opposite helices, which can compress the floating wood fibers downward, thereby effectively reducing the "mushroom effect" generated after tapping and ensuring a smooth and beautiful wood surface.

[0031] Secondly, when the deck screw 100 is screwed outward, since the spiral direction is opposite, the reverse thread 42 repels the thread made by the drilled thread 41 in the plate body. The reverse thread 24 needs to overcome the resistance formed by the opposite thread segment. Therefore, the deck screw 100 has high stability after being screwed into the plate body and can prevent it from being passively screwed out due to long-term use or vibration.

[0032] In one embodiment, the pitch L2 of the reverse thread 42 is smaller than the pitch L1 of the drilled thread 41, which can appropriately reduce the resistance encountered by the reverse thread 42 when drilling, and make it easier for the reverse thread 42 to enter the hole.

[0033] Preferably, a plurality of notches 43 are provided on the drilled thread 41, which are used to discharge the waste chips generated during drilling backward.

[0034] exist Figure 1 In the illustrated embodiment, the notches 43 on the drilled thread 41 are not on a straight line, but on a spiral line. This spiral line is in the same direction as the drilling, that is, in the direction from the nail head 10 to the nail tip 30, and is set along the direction of rotation during drilling, thus forming a spiral chip removal channel. During drilling, the notches 43 advance in a spiral manner within the hole, that is, they rotate while moving into the hole. After the notches 43 are set in a spiral manner, during drilling, after the previous notch 43 passes through a certain position, the next notch 43 will rotate to reach that position when moving into the hole. That is, the notches 43 on the chip removal channel can pass through the same position, which is more conducive to chip removal.

[0035] Preferably, multiple notches 43 are provided on the drilled thread 41, and the multiple notches 43 form multiple spiral chip removal channels to improve the overall chip removal effect and thus improve the crack prevention effect.

[0036] Preferably, the end face of the nail head 10 facing the nail shank 20 is provided with a serrated protrusion 11 surrounding the nail shank 20. This protrusion 11 includes multiple inclined surfaces 111 and a vertical surface 112 connecting two inclined surfaces 111. The inclined surfaces 111 face the screwing direction of the deck screw 100, while the vertical surface 112 is parallel to the axial direction of the nail shank 20 and faces away from the screwing direction of the deck screw 100. The serrated protrusion 11 can generate greater friction with the wood surface after being fully screwed in, thereby enhancing the interlocking force, further improving pull-out resistance, and preventing the deck screw 100 from loosening. Furthermore, the inclined surfaces 111 face the drilling direction, allowing the protrusion 11 to drill in smoothly, thereby reducing resistance and avoiding scraping the area near the drill hole.

[0037] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A deck screw, characterized in that, It includes a nail head, a nail shank, and a nail tip. The nail shank is threaded, and the nail tip has two opposing notches and a cutting surface between the two notches. The notches extend from the tip of the nail tip toward the nail shank.

2. The deck screw according to claim 1, characterized in that, The nail tip includes an elliptical cone-shaped pre-drilled hole and a connecting part that connects the pre-drilled hole and the nail rod, and the notch and cut are provided on the connecting part.

3. The deck screw according to claim 2, characterized in that, The notch includes a first plane extending from the surface of the pre-drilled hole toward the axis of the nail rod, and a second plane connected to the first plane from the surface of the pre-drilled hole, wherein the included angle between the first plane and the second plane is an obtuse angle.

4. The deck screw according to claim 3, characterized in that, The area of ​​the first plane is smaller than the area of ​​the second plane, and / or The notch also includes an arc-shaped guide surface that connects the first plane and the second plane and extends to the surface of the connecting portion.

5. The deck screw according to claim 1, characterized in that, The thread includes a drilled thread near the nail tip and a reverse thread located between the drilled thread and the nail head, wherein the helical direction of the reverse thread is opposite to that of the drilled thread.

6. The deck screw according to claim 5, characterized in that, The pitch of the reverse thread is smaller than that of the drilled thread.

7. The deck screw according to claim 5, characterized in that, The drilled thread has multiple notches for chip removal.

8. The deck screw according to claim 7, characterized in that, The notches are arranged sequentially along the drilling rotation direction in the direction from the nail head to the nail tip, and the notches form a spiral chip removal channel.

9. The deck screw according to claim 8, characterized in that, The drilled thread is provided with multiple chip removal channels.

10. The deck screw according to claim 1, characterized in that, The end face of the nail head facing the nail rod is provided with a serrated protrusion surrounding the nail rod. The protrusion includes multiple inclined surfaces and a vertical surface connecting two inclined surfaces. The inclined surfaces face the screwing direction of the deck screw, and the vertical surface is parallel to the axial direction of the nail rod and faces away from the screwing direction of the deck screw.

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