Drill-tipped new threaded screw

Abstract

The invention relates to a new threaded screw with a drill tip that eliminates the need for pre-drilling, enabling fast and efficient fastening, and simultaneously reduces the formation of harmful burrs and chips during the fastening process by providing a thread geometry. This new threaded screw overcomes the limitations of conventional screws.

Description

[0001] DESCRIPTION DRILL-TIPPED NEW THREADED SCREW

[0002] TECHNICAL FIELD

[0003] The invention relates to a new threaded screw with a drill tip that eliminates the need for pre-drilling, enabling fast and efficient fastening, and simultaneously reduces the formation of harmful burrs and chips during the fastening process by providing a thread geometry. This new threaded screw overcomes the limitations of conventional screws.

[0004] PRIOR ART

[0005] A self-drilling screw is a type of screw that features a tip functioning as a drill bit and sharp cutting threads that perform the drilling operation by contacting the hole during installation. The tip of the screw acts as a drill bit, making the installation significantly faster. In other words, these conventional applications focus on either rapid assembly or penetration quality. However, they are unable to provide both features simultaneously. Attempts to provide both features at once fall outside the optimal performance range. Therefore, there is a need for new screws that offer both rapid assembly and high penetration quality at the same time.

[0006] BRIEF DESCRIPTION OF THE INVENTION

[0007] The invention relates to a new threaded screw with a drill tip that eliminates the need for pre-drilling, enabling fast and efficient fastening, and simultaneously reduces the formation of harmful burrs and chips during the fastening process by providing a thread geometry. This new threaded screw overcomes the limitations of conventional screws.

[0008] The ability of our invention to eliminate the pre-drilling process simplifies installation procedures and provides savings in time and labor costs. Additionally, its advanced vibration resistance and burr minimization features make it suitable for harsh environments exposed to dynamic loads or abrasive elements.

[0009] Our drill-tip screw is used in a wide range of applications. Examples include:

[0010] • Sandwich panel assemblies: The screw’s self-drilling and burr-reducing features accelerate sandwich panel installation, providing a clean and corrosion-resistant connection. • Solar panel installations: The screw’s vibration resistance and corrosion reduction properties contribute to the long-term reliability and performance of solar panel arrays.

[0011] • Automotive and aerospace assemblies: The screw’s ability to withstand vibrations and dynamic loads makes it ideal for critical applications in the automotive and aerospace sectors.

[0012] • General construction and manufacturing: The versatility and ease of use of the screw make it a valuable asset across a broad range of construction and manufacturing scenarios.

[0013] LIST OF FIGURES

[0014] Figure 1. General View of the New Threaded Screw

[0015] Figure 2. Perspective View of the New Threaded Screw

[0016] Figure 3. G-Detail View

[0017] Figure 4. F-Detail View

[0018] Correspondence of the Numbers Shown in the Figures

[0019] A. Major diameter of the single-threaded region

[0020] B. Minor diameter of the single-threaded region

[0021] C. Thread angle - 1

[0022] D. Thread angle - 2

[0023] E. Tip angle

[0024] H. Pitch dimension of the double-threaded region - 1

[0025] I. Pitch dimension of the double-threaded region - 2

[0026] J. Pitch dimension of the single-threaded region

[0027] K. Hole diameter tolerance

[0028] L. Length of the double high-low thread region

[0029] M. Length of the single-threaded region

[0030] N. Total screw length

[0031] DETAILED DESCRIPTION OF THE INVENTION

[0032] The invention is characterized by the following components: major diameter of the single-threaded region (A), minor diameter of the single-threaded region (B), thread angle - 1 (C), thread angle - 2 (D), tip angle (E), pitch dimension of the double-threaded region - 1 (H), pitch dimension of the double-threaded region - 2 (I), pitch dimension of the single-threaded region (J), hole diameter tolerance (K), length of the double high-low thread region (L), length of the single-threaded region (M), and total screw length (N).

[0033] In an exemplary embodiment of our invention, the total screw length (N) is 25.5 mm, the length of the double high-low thread region (L) is 18.5 mm, and the length of the single-threaded region (M) is 7 mm. The major diameter of the singlethreaded region (A) is 5.5 mm, while the minor diameter of the single-threaded region (B) is 4.6 mm. The tolerance of the hole diameter (K) is ±0.1 mm. Our invention can be applied to large parts with a diameter of at least 4 mm and a length of at least 10 mm.

[0034] The single-threaded region forms the initial cutting section of the drilling process, enabling penetration into a workpiece without pre-drilling. The geometry of our invention, suitable for workpiece materials up to 200 HV hardness (such as sheet metals), provides efficient penetration into metals (within a maximum of 2 seconds, under a load of 15 kg, with a rotational speed below 2000 revolutions per minute driven by a hand drill). This eliminates the need for a separate drilling tool. The single-threaded region engages smoothly, reducing torque requirements and enhancing fastening efficiency. The lower pitch dimension maximizes penetration efficiency. The pitch dimension of the single-threaded region (J) is 1.4 mm.

[0035] Following the single-threaded region, the screw transitions into the double high-low thread region. This different arrangement features alternating high and low threads that increase the contact area between the screw shaft and the workpiece. The enhanced thread engagement improves fastening strength, increases feed per revolution, and enables faster assembly than standard screws. Additionally, the alternating high and low threads of the double high-low region distribute clamping forces evenly, reducing stress concentrations and enhancing joint integrity. The pitch dimension of the double high-low region - 1 (H) and - 2 (I) are each 2.8 mm in length.

[0036] Thread angle - 1 (C), thread angle - 2 (D), and tip angle (E) play a crucial role in determining the cutting efficiency, self-centering ability, and overall performance of the screw. Optimized angles reduce burr formation, minimize heat generation, and lower the risk of workpiece deformation or damage. In our invention, the drill-point screw features a thread angle - 1 (C) of 40°, a thread angle - 2 (D) of 60°, and a tip angle (E) of 30°.

[0037] The screw of our invention reduces burr and chip formation during fastening through its thread geometry. This feature decreases material displacement and prevents chip accumulation, which can otherwise act as initiation sites for corrosion or structural defects. Burr minimization is particularly important in sandwich panel and solar panel installations where bimetallic contact is present, since such protrusions may accelerate corrosion, jeopardizing long-term reliability and structural integrity.

[0038] The fastening method using our drill-point screw with the new thread design comprises the following steps:

[0039] - positioning the drill-point screw onto a workpiece,

[0040] - driving the drill-point screw into the workpiece, thereby ensuring penetration through the single-threaded region without pre-drilling, while the double high-low thread region provides enhanced fastening engagement and resistance against loosening caused by vibrations.

Claims

CLAIMS1. A drill-point new threaded screw that eliminates the need for pre-drilling, provides fast and efficient fastening, and simultaneously reduces the formation of burrs and chips during the fastening process through its thread geometry, characterized by;- a single-threaded region having a pitch dimension (J), which constitutes the leading section of the drilling process and facilitates penetration into a workpiece without pre-drilling,- a double high-low thread region with alternating high and low threads, which increases the contact area between the screw shaft and the workpiece, enables rapid assembly, distributes clamping forces evenly, and supports joint integrity,- thread angle - 1 (C), thread angle - 2 (D), and tip angle (E), which determine the cutting efficiency, self-centering ability, and overall drilling performance of the screw.

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