FASTENING SCREW AND HEIGHT-ADJUSTABLE TABLE USING THE SAME

Abstract

A fastening screw and a height-adjustable table using the same are provided. A threadless transition portion is provided between a threaded section and a head portion of the fastening screw to increase the contact area between the screw and a workpiece, and to cooperate with a shaft portion to fasten the workpiece. The transition portion is provided with a tapered wall surface, and the transition portion expands from the threaded section to the head portion of the screw. The screw offers a tension expanding outward in a circumferential direction of a mounting portion. An area of a joint between the transition portion and the head portion does not exceed a circumferential area of threads. In a direction of a central axis of the screw, the projection of the transition portion overlaps that of the shaft portion, which prevents the transition portion from falling off the workpiece or damaging the workpiece.

Claims

1. A fastening screw, comprising a head portion and a shaft portion; wherein the head portion is connected to the shaft portion; a transition portion is provided between the head portion and the shaft portion, and the transition portion is tightly fit with a workpiece to be fastened; and the transition portion is threadless.

2. The fastening screw according to claim 1, wherein the transition portion is provided with a tapered wall surface; the transition portion expands from the shaft portion to the head portion; and an area of a joint between the transition portion and the head portion of the fastening screw is greater than an area of a joint between the transition portion and the shaft portion.

3. The fastening screw according to claim 2, wherein an axial projection of the joint between the transition portion and the head portion of the fastening screw and an axial projection of the joint between the transition portion and the shaft portion are concentric circles.

4. The fastening screw according to claim 3, wherein a circumferential radius of the joint between the transition portion and the head portion of the fastening screw is greater than a circumferential radius of the joint between the transition portion and the shaft portion of the fastening screw.

5. The fastening screw according to claim 4, wherein the circumferential radius of the joint between the transition portion and the head portion of the fastening screw is 0.1-0.2 mm greater than the circumferential radius of the joint between the transition portion and the shaft portion of the fastening screw.

6. The fastening screw according to claim 1, wherein an axial projection of a joint between the transition portion and the head portion of the fastening screw and an axial projection of the shaft portion of the fastening screw are concentric circles.

7. The fastening screw according to claim 6, wherein an axial projection area of the joint between the transition portion and the head portion of the fastening screw is less than or equal to an axial projection area of threads of the shaft portion of the fastening screw.

8. The fastening screw according to claim 1, wherein an axial length of the transition portion is greater than an axial length of two threads of the threaded shaft portion, and is less than an axial length of six threads of the threaded shaft portion.

9. A height-adjustable table, wherein the height-adjustable table uses the fastening screw according to claim 1.

10. The height-adjustable table according to claim 9, wherein the height-adjustable table is provided with a mounting hole for assembly; and the fastening screw passes through the mounting hole to cooperate with a nut through threads to connect components of the height-adjustable table.

11. The height-adjustable table according to claim 9, wherein the transition portion is provided with a tapered wall surface; the transition portion expands from the shaft portion to the head portion; and an area of a joint between the transition portion and the head portion of the fastening screw is greater than an area of a joint between the transition portion and the shaft portion.

12. The height-adjustable table according to claim 11, wherein an axial projection of the joint between the transition portion and the head portion of the fastening screw and an axial projection of the joint between the transition portion and the shaft portion are concentric circles.

13. The height-adjustable table according to claim 12, wherein a circumferential radius of the joint between the transition portion and the head portion of the fastening screw is greater than a circumferential radius of the joint between the transition portion and the shaft portion of the fastening screw.

14. The height-adjustable table according to claim 13, wherein the circumferential radius of the joint between the transition portion and the head portion of the fastening screw is 0.1-0.2 mm greater than the circumferential radius of the joint between the transition portion and the shaft portion of the fastening screw.

15. The height-adjustable table according to claim 9, wherein an axial projection of a joint between the transition portion and the head portion of the fastening screw and an axial projection of the shaft portion of the fastening screw are concentric circles.

16. The height-adjustable table according to claim 15, wherein an axial projection area of the joint between the transition portion and the head portion of the fastening screw is less than or equal to an axial projection area of threads of the shaft portion of the fastening screw.

17. The height-adjustable table according to claim 9, wherein an axial length of the transition portion is greater than an axial length of two threads of the threaded shaft portion, and is less than an axial length of six threads of the threaded shaft portion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described in detail below with reference to the drawings and preferred embodiments. However, those skilled in the art should understand that these drawings are drawn only for the purpose of explaining the preferred embodiments, and therefore should not be construed as a limitation to the scope of the present invention. In addition, unless otherwise specified, the drawings are only intended to conceptually represent the composition or configuration of the described objects and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0039] FIG. 1 is a structural view of a fastening screw according to the present invention;

[0040] FIG. 2 is a lateral view of the fastening screw according to the present invention;

[0041] FIG. 3 is a structural view of the fastening screw and a height-adjustable table using the same according to the present invention; and

[0042] FIG. 4 is a detail view of A shown in FIG. 1.

[0043] Reference Numerals: 1. head portion; 2. shaft portion; 3. transition portion; 4. threads; 5. washer; 6. slot; 7. fastening screw; 8. height-adjustable table; 9. mounting hole; and 10. nut.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The present invention is described in detail below with reference to FIGS. 1 to 4.

[0045] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present invention, rather than to limit the present invention.

[0046] FIGS. 1 and 2 show a specific embodiment of the present invention.

[0047] This embodiment specifically provides a fastening screw, including a head portion 1 and a shaft portion 2. The head portion 1 is connected to the shaft portion 2.

[0048] A transition portion 3 is provided between the head portion 1 and the shaft portion 2, and the transition portion 3 is tightly fit with a workpiece to be fastened.

[0049] The transition portion 3 is threadless.

[0050] The threadless transition portion 3 is provided between the shaft portion 2 and the head portion 1 of the screw. The transition portion 3 will be in stable pressing contact with the workpiece as the screw enters a hole of the workpiece, thereby increasing a contact area between the screw and the workpiece, and cooperating with the shaft portion 2 to further fasten the workpiece. This design greatly improves the friction between the screw and the workpiece, and improves the fastening effect of the screw on the workpiece.

[0051] Further, the present invention provides another embodiment, as shown in FIGS. 1 and 2.

[0052] In a main concept of this embodiment, the transition portion 3 is provided with a tapered wall surface, and the transition portion 3 expands from a threaded section to the head portion 1 of the screw. In this way, the screw offers a tension expanding outward in a circumferential direction of a mounting portion, thereby improving the tightness.

[0053] This embodiment specifically provides a fastening screw, including a head portion 1 and a shaft portion 2. The head portion 1 is connected to the shaft portion 2. A transition portion 3 is provided between the head portion 1 and the shaft portion 2, and the transition portion 3 is tightly fit with a workpiece to be fastened. The transition portion 3 is threadless.

[0054] The transition portion 3 is provided with a tapered wall surface, and the transition portion 3 expands from the shaft portion 2 to the head portion 1.

[0055] An area of a joint between the transition portion 3 and the head portion 1 of the screw is greater than that of a joint between the transition portion 3 and the shaft portion 2. The axial projection of the joint between the transition portion 3 and the head portion 1 of the screw and the axial projection of the joint between the transition portion 3 and the shaft portion 2 are concentric circles. A circumferential radius of the joint between the transition portion 3 and the head portion 1 of the screw is greater than a circumferential radius of the joint between the transition portion 3 and the shaft portion 2 of the screw. The circumferential radius of the joint between the transition portion 3 and the head portion 1 of the screw is 0.1-0.2 mm greater than the circumferential radius of the joint between the transition portion 3 and the shaft portion 2 of the screw.

[0056] A traditional screw uses a flat washer or a spring washer for fastening to increase the friction between the screw and the workpiece and reduce the possibility of screw loosening. In this embodiment, the transition portion 3 is provided with a circular truncated cone-shaped transition surface. The transition surface can increase the contact area between the screw and the workpiece, and increase the friction between the entire screw and the workpiece, such that the screw is not easy to loosen after being tightened. In addition, in this embodiment, the tapered surface of the transition portion 3 expands from the shaft portion to the head portion. In this structure, tension is generated between the inclined wall surface and the mounting portion of the workpiece. When threads cut into the workpiece, a rigid deformation will occur between the tapered expansion surface and the workpiece. The tension is far greater than that generated by a straight cylindrical wall, such that the screw is tight at the mounting portion to fix the workpiece in a radial direction. Therefore, the screw is hard to loosen and slip off.

[0057] Further, the present invention provides another embodiment, as shown in FIGS. 1 and 2.

[0058] In a main concept of this embodiment, the joint area between the transition portion 3 and the head portion 1 does not exceed a circumferential area of threads 4. In a direction of a central axis of the screw, projection of the transition portion 3 overlaps that of the shaft portion 2, so as to prevent the transition portion 3 from falling off the workpiece or causing damage to the workpiece.

[0059] This embodiment specifically provides a fastening screw, including a head portion 1 and a shaft portion 2. The head portion 1 is connected to the shaft portion 2. A transition portion 3 is provided between the head portion 1 and the shaft portion 2, and the transition portion 3 is tightly fit with a workpiece to be fastened. The transition portion 3 is threadless. The transition portion 3 is provided with a tapered wall surface, and the transition portion 3 expands from the shaft portion 2 to the head portion 1.

[0060] An area of a joint between the transition portion 3 and the head portion 1 of the screw is greater than an area of a joint between the transition portion 3 and the shaft portion 2. The axial projection of the joint between the transition portion 3 and the head portion 1 of the screw and the axial projection of the joint between the transition portion 3 and the shaft portion 2 are concentric circles. A circumferential radius of the joint between the transition portion 3 and the head portion 1 of the screw is greater than a circumferential radius of the joint between the transition portion 3 and the shaft portion 2 of the screw. The circumferential radius of the joint between the transition portion 3 and the head portion 1 of the screw is 0.1-0.2 mm greater than the circumferential radius of the joint between the transition portion 3 and the shaft portion 2 of the screw.

[0061] The shaft portion is provided with threads, and the screw is engaged with a workpiece through the threads. The axial projection of a joint between the transition portion and the head portion of the screw and the axial projection of the shaft portion of the screw are concentric circles. An axial projection area of the joint between the transition portion and the head portion of the screw is not greater than an axial projection area of the threads of the shaft portion of the screw. An axial length of the transition portion is greater than an axial length of at least two threads of the threaded shaft portion, and is less than an axial length of at most six threads of the threaded shaft portion.

[0062] In this embodiment, the axial projection area of the joint between the transition portion 3 and the head portion 1 of the screw is less than the axial projection area of the threads of the shaft portion 2 of the screw. When the screw is completely tightened, the transition surface mainly acts on an internal thread portion of the workpiece to ensure that the transition portion 3 of the screw tightly presses the workpiece while preventing the main body of the workpiece from deforming.

[0063] Further, the present invention may provide another embodiment, as shown in FIGS. 3 and 4.

[0064] As shown in FIGS. 3 and 4, in a main concept of this embodiment, a height-adjustable table 8 is provided. The height-adjustable table 8 uses a fastening screw in any one of the above-mentioned embodiments.

[0065] The height-adjustable table 8 is provided with a mounting hole 9 for assembly. The fastening screw passes through a corresponding mounting hole 9 to cooperate with a nut 10 through the threads 4 to connect components of the height-adjustable table 8.

[0066] In the prior art, the screw used by a height-adjustable table 8 is an ordinary screw, which is easy to fall off after long-term use. In view of this, the present invention provides a height-adjustable table 8 using the same provided by the present invention. The fastening screw has a simple structure and is not easy to loosen, which greatly prolongs the service life of the height-adjustable table 8 and improves the stability performance thereof.

[0067] The present invention provides a fastening screw and a height-adjustable table 8 using the same. The transition portion 3 is provided between the threaded section and the head portion 1 of the screw, and the transition portion 3 is threadless, which increases the contact area between the screw and the workpiece, and cooperates with the shaft portion 2 to further fasten the workpiece. The wall surface of the transition portion 3 is a tapered surface, and the transition portion 3 expands from a threaded section to the head portion 1 of the screw. In this way, the screw offers a tension expanding outward in a circumferential direction of a mounting portion, thereby improving the tightness. The joint area between the transition portion 3 and the head portion 1 does not exceed a circumferential area of threads 4. In a direction of a central axis of the screw, projection of the transition portion 3 overlaps that of the shaft portion 2, so as to prevent the transition portion 3 from falling off the workpiece or causing damage to the workpiece. The fastening screw provided by the present invention has the advantages of simple structure, desirable fastening and anti-falling performance and convenient mounting, etc.

[0068] The present invention is described in detail above. Specific cases are used herein to illustrate the principle and implementation of the present invention, and the description of the above embodiments is only intended to help understand the core idea of the present invention. It should be noted that improvements and modifications may be made by those of ordinary skill in the art without departing from the principle of the present invention, and these improvements and modifications should also fall within the protection scope of the present invention.