screw
The screw design with a standard thread transitioning to an asymmetrical thread addresses structural complexity and resistance issues, ensuring efficient and smooth drilling and tapping with reduced torque and chip evacuation.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2026-02-12
- Publication Date
- 2026-04-09
AI Technical Summary
Conventional screws face issues such as complex structure, mutual interference of hole expansion and chip discharge, drilling failure range expansion, uplift and collapse on the plate surface, and high resistance during drilling and tapping, especially when dealing with different materials or composite materials.
A screw design featuring a head with a threaded portion that includes a standard thread extending to the end, transitioning into an asymmetrical thread through a modified lower thread angle in a helical manner, providing low torque, smooth chip evacuation, and reduced tapping resistance.
The design achieves a narrow drilling failure range, prevents uplift and collapse, and ensures low torque and smooth chip evacuation, enhancing the practicality and efficiency of screwing operations.
Smart Images
Figure 0003255458000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a screw that can be widely applied to the screwing of single plates and composite plates.
Background Art
[0002] In the related structural design of a general known drill screw with drilling and screwing, in order to equally pursue the improvement of chip discharge effect, the speeding up of drilling effect, and the practicality of screwing effect, different technical creative thoughts have generated different structural results and effects while pursuing a drill screw with drilling and screwing. In addition to the need to pursue the improvement of chip discharge effect, the speeding up of drilling effect, and the practicality of screwing effect, for articles of different materials or articles of one or more composite materials, in order to require the practicality of screwing and threading, continuous improvement and improvement are needed, and it is necessary to pursue the progressiveness and practicality of the structure and locking effect of the drill screw.
Summary of the Invention
Problems to be Solved by the Invention
[0003] However, in the prior art designs of drilling and tapping with conventional screws, due to the creation of the idea of screw structure and the technical practical effect of the design, for example, there are long-existing drawbacks such as the complexity of the screw structure, the mutual interference of hole expansion and chip discharge caused by alternating threads, and the expansion of the drilling failure range, uplift and collapse on the plate surface of the member to be screwed, as well as problems such as the large resistance of drilling and tapping and the poor chip discharge.
[0004] Therefore, the present creator considered that the above-mentioned drawbacks could be improved, and as a result of repeated intensive studies, the present invention was proposed to effectively improve the above-mentioned problems through a reasonable design.
[0005] The present invention has been made in view of such a situation, and its purpose is to provide a screw having the following characteristics 1-3. That is, 1. The drilling failure range on the plate surface of the member to be screwed is narrow, preventing the uplift and collapse phenomena of drilling. 2. It provides practical benefits such as low drilling and screwing torque, low tapping resistance, and smooth chip evacuation. 3. In the case where the screw according to the present invention is integrally molded and has a tip end region that includes a complete and uninterrupted standard thread extending to the end of the screw portion, the lower thread angle of the standard thread at the end portion directly and gradually modifies the lower thread angle of the screw in a helical manner, resulting in an asymmetric thread angle of an asymmetric thread, and the thread angle that extends directly in a helical manner is modified through advanced molding. Advanced, creative technology and novel screw structures that demonstrate practicality will reveal the industrial applicability and economic benefits of screws. [Means for solving the problem]
[0006] To achieve the above objective, one aspect of the present invention provides a screw comprising a head and a threaded portion connected below the head. The threaded portion has at least one helical thread, the at least one helical thread including a standard thread and an asymmetrical thread that extends integrally without interruption. When the standard thread of a helical screw is extended spirally to the very end of the screw thread, the angle of the lower tooth surface at the end of the standard thread is altered by the distance between the end of the standard thread that extends to the very end of the screw thread and the very end of the screw thread, resulting in an asymmetrical thread angle that gradually extends to the very end of the screw thread.
[0007] Preferably, as the standard threads included in the helical threads of the screw extend to the end portion of the screw thread, the standard thread angle of the standard threads is modified, gradually forming a lower tooth surface angle. At the end portion, the lower tooth surface angle of the standard thread angle of the standard threads is gradually modified in a helical manner, resulting in an asymmetrical thread angle of the asymmetrical threads.
[0008] Preferably, the asymmetric thread in the asymmetric thread setting region is a helical thread with at least two to three turns.
[0009] Preferably, the thread angle on the upper and lower tooth surfaces of the standard thread of the helical screw is in the range of 55° to 65°.
[0010] Preferably, the thread angle on the upper and lower tooth surfaces of the asymmetrical helical thread is in the range of 65° to 90°.
[0011] The following information will become clear from the description in the specification and drawings described later. [Brief explanation of the drawing]
[0012] [Figure 1] This is a schematic diagram showing a screw according to one embodiment of the present invention. [Figure 2] Figure 1 is a partially enlarged view of one embodiment shown. [Figure 3] Figure 1 is a schematic enlarged view showing an asymmetrical screw thread in one embodiment. [Figure 4] This is a schematic cross-section showing that a standard screw thread according to one embodiment of the present invention changes the angle of the lower tooth surface of the screw thread, forming a progressively asymmetrical screw thread in a helical manner. [Modes for carrying out the invention]
[0013] The present invention will be described below through embodiments of the invention, but these embodiments are not intended to limit the scope of the invention covered by the utility model registration claims. Furthermore, not all combinations of features described in the embodiments are necessarily essential to the solution of the invention.
[0014] The screw comprises a head 1, a threaded portion 2 connected below the head 1, a complete and uninterrupted helical thread 21 located on the threaded portion 2, a helical thread having at least one single or double helix on the threaded portion 2, and a tip end portion 20 located at the end of the threaded portion 2.
[0015] As shown in Figure 1, the threaded portion 2 has at least one helical thread 21 (Figure 1 illustrates a double helical thread), and the at least one helical thread 21 itself is a complete and uninterrupted continuous thread. As shown in Figure 2, the continuous thread of the helical thread 21 includes a standard thread 21A and an asymmetrical thread 21B, and the standard thread 21A of the helical thread 21 is forged to be formed on the threaded portion 2. If the standard thread 21A extends helically to the tip end portion 20 of the threaded portion 2, the asymmetrical thread setting region B (see Figures 2 and 4), which is the distance between the end of the standard thread 21A extending to the tip end portion 20 and the tip end portion 201, directly alters the lower thread angle and pitch of the end of the standard thread 21A, gradually helically becoming the asymmetrical thread 21B (see Figures 3 and 4) and then the tip end portion 201. The asymmetric thread 21B in the asymmetric thread setting region B is a helical thread that makes at least approximately 2 to 3 turns.
[0016] As shown in Figure 4, the ideal angle of the standard thread angle A on the upper and lower tooth surfaces of the standard thread 21A of the helical thread 21 is in the range of 55° to 65°, and the ideal angle of the asymmetric thread angle C of the upper tooth surface angle C1 and lower tooth surface angle C2 of the asymmetric thread 21B of the helical thread 21 is in the range of 65° to 90°. When the tip end region of the threaded portion 2 includes a complete and uninterrupted standard thread 21A that extends to the tip end portion 20, as shown in Figure 4, in the region from 21A to 21B, the lower thread angle of the lower tooth surface of the standard thread angle A of the standard thread 21A at the tip portion directly and gradually modifies the lower thread angle of the standard thread angle A of the thread in a helical manner, resulting in the angle of the asymmetric thread angle C of the asymmetric thread 21B.
[0017] Although embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like are also included within the scope of the spirit of the present invention. [Explanation of Symbols]
[0018] 1 head 2. Screw part The end portion of the tip 201 The end of the tip 21 Spiral thread 21A Standard thread 21B Asymmetric thread A Standard thread angle B Asymmetric thread setting area C Asymmetric thread angle C1 Upper tooth surface angle C2 Lower tooth surface angle
Claims
1. A screw comprising a head and a threaded portion connected to the lower part of the head, The screw portion has at least one helical thread, and the at least one helical thread includes a standard thread and an asymmetrical thread that extends integrally without interruption. A screw characterized in that, when the standard thread of the helical thread is extended helically to the end portion of the tip of the screw portion, the angle of the lower tooth surface at the end of the standard thread is altered by the distance between the end of the standard thread that extends to the end portion of the tip and the end of the tip, resulting in an asymmetrical thread angle that gradually extends to the end of the tip.
2. The screw according to claim 1, characterized in that when the standard thread included in the helical thread is extended to the end portion of the tip of the screw portion, the standard thread angle of the standard thread is modified and the lower tooth surface angle is gradually formed, and the lower tooth surface angle of the standard thread at the end portion is gradually modified in a helical manner, resulting in the asymmetric thread angle of the asymmetric thread.
3. The screw according to claim 1, characterized in that the asymmetric thread in the asymmetric thread setting region is a helical thread that has been wound at least two to three times.
4. The screw according to claim 1, characterized in that the thread angle on the upper and lower tooth surfaces of the standard thread of the helical thread is in the range of 55° to 65°.
5. The screw according to claim 1, characterized in that the thread angle on the upper and lower tooth surfaces of the asymmetric thread of the helical thread is in the range of 65° to 90°.