Thread forming screw

Abstract

The utility model discloses a thread forming screw, which relates to the technical field of screws, and comprises a screw head, a screw rod and a screw tail, the top of the screw head is provided with a driving structure, a transition section is arranged between the screw rod and the screw tail, the screw rod is provided with a complete cylindrical thread, the transition section is provided with an incomplete thread, and the incomplete thread is provided with a thread. The screw is characterized in that the screw tail adopts a thread-free design, the screw tail comprises at least one arc section or at least one linear section, the section of the screw tail in the arc section is quadrilateral and has a fillet or a circle or an ellipse, and incomplete threads on the transition section are gradually reduced from the screw rod to the screw tail. The incomplete threads on the transition section are in smooth transition with the screw rod and the screw tail respectively; according to the thread forming screw, through the specific structural design, pre-drilling, chambering, thread forming and tightening on a plate or a thin wall can be synchronously completed, connection of parts is completed, and the process cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of screw technology, and in particular to a threaded screw. Background Technology

[0002] Threaded connections utilize threaded components. They primarily fasten the connected parts together through the relative movement of the helical pair between the internal and external threads. Screw connections are a type of threaded connection. They involve directly screwing a screw into the threaded hole of the connected parts, without a nut. The engagement between the external thread of the screw and the internal thread of the connected parts generates axial force, tightly connecting two or more parts together. This connection method utilizes the self-locking property of threads, allowing it to withstand certain tensile, compressive, and shear forces after tightening.

[0003] In existing technologies, when connecting separable plates or thin-walled parts, it is usually necessary to pre-drill holes in the plates or thin-walled parts before tightening them with screws or bolts and nuts.

[0004] Therefore, a thread-forming screw is proposed, which enables pre-drilling, hole enlargement, thread forming, and tightening to be carried out simultaneously on a plate or thin-walled material, and completes the connection of the components. Utility Model Content

[0005] In view of the problem that when connecting separable plates or thin-walled parts, it is usually necessary to pre-drill holes in the plates or thin walls before tightening with screws or bolts and nuts, this utility model is proposed.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a threaded screw, comprising a head, a shank, and a tail. The head has a driving structure at its top. A transition section is provided between the shank and the tail. The shank has a complete cylindrical thread, and the transition section has an incomplete thread. The tail has a threadless design and includes at least one arc segment or at least one straight segment. The arc segment of the tail has a quadrilateral cross-section with rounded corners, or a round or elliptical shape. The incomplete thread on the transition section gradually decreases from the shank to the tail, and the incomplete thread on the transition section smoothly transitions with the shank and the tail.

[0007] Preferably, the nail tail includes an arc segment and two straight segments. The side line of the arc segment is an arc with a fixed curvature, and the arc is a convex curve that bulges outward. The side lines of the two straight segments are a straight line and an oblique line, respectively.

[0008] Preferably, the side line of the nail tail includes an arc with a fixed curvature, a straight line, and a diagonal straight line. The straight line is located below the arc and transitions smoothly at the intersection point, and the diagonal straight line is located below the straight line and transitions smoothly at the intersection point.

[0009] Preferably, the cross-sectional shape of the nail tail in the arc segment is a quadrilateral with rounded corners, and the cross-sectional shape of the nail tail in the straight segment is a quadrilateral, a circle, or an ellipse with rounded corners.

[0010] Preferably, the cross-section of the transition section gradually decreases from the nail head to the nail tail, and the cross-section of the transition section gradually changes from a quadrilateral to a circle from the nail tail towards the nail head, and is smoothly connected to the screw.

[0011] Preferably, the nail tail is composed of an arc segment, the side line of which is an arc with a fixed curvature, the arc being a convex curve that bulges outward, and the arc segment gradually decreases in size along the direction from the nail head to the nail tail and smoothly transitions at the intersection.

[0012] Preferably, the cross-sectional shape of the nail tail formed by the arc is a quadrilateral or an ellipse with rounded corners.

[0013] Preferably, the straight segment of the screw tail forms the sharp tip of the screw, and the cross-section of the screw tip is circular or a chamfered quadrilateral.

[0014] The beneficial effects of this utility model are:

[0015] By using a nail head with a quadrilateral cross-section, and the side of the nail head consisting of an arc, a straight line, and a diagonal straight line, this specific structural design enables pre-drilling, hole enlargement, thread forming, and tightening to be completed simultaneously on sheet metal or thin-walled materials, thus completing the connection of components and saving process costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of 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. Among them:

[0017] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model.

[0018] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0019] Figure 3 This is a front view structural diagram of the present utility model.

[0020] Figure 4This is a schematic diagram of the cross-section at point AA of this utility model.

[0021] Figure 5 This is a schematic cross-sectional view of the BB section of this utility model.

[0022] Figure 6 This is a cross-sectional view of the CC section of this utility model.

[0023] Figure 7 This is a cross-sectional schematic diagram of the DD section of this utility model.

[0024] Figure 8 This is a schematic diagram of the structure of the second embodiment of the present utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Nail head; 2. Drive structure; 3. Screw; 4. Transition section; 5. Nail tail; 51. Circular arc section; 52. Straight line section; 6. Transition section cross-section; 7. Circular arc section cross-section; 8. Straight line section cross-section; 9. Oblique straight line section cross-section. Detailed Implementation

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0028] Reference Figures 1 to 8 This invention provides a threaded screw, comprising a head 1, a screw 3, and a tail 5. The head 1 has a drive structure 2 at its top. A transition section 4 is provided between the screw 3 and the tail 5. The screw 3 has a complete cylindrical thread, and the transition section 4 has an incomplete thread. The tail 5 has a threadless design and includes at least one arc segment 51 or at least one straight segment 52. The cross-section 7 of the arc segment of the tail 5 is quadrilateral with rounded corners, or a circle or an ellipse. The incomplete thread on the transition section 4 gradually decreases from the screw 3 to the tail 5, and the incomplete thread on the transition section 4 smoothly transitions with the screw 3 and the tail 5.

[0029] Example 1: Specifically, the screw 3 is cylindrical, and a cylindrical external thread is provided on the outside of the screw 3. An incomplete thread is provided on the transition section 4. The incomplete thread on the transition section 4 gradually decreases in size from the screw 3 to the tail 5 until it becomes smooth. The incomplete thread on the transition section 4 smoothly transitions with both the screw 3 and the tail 5, as shown in the reference. Figure 5The transition section 6 has a quadrilateral shape on the side near the screw 3, and the transition section 4 has a circular shape on the side near the nail tail 5. The cross-section of the transition section 4 gradually decreases in size from the nail head 1 to the nail tail 5. The cross-section of the transition section 4 gradually changes from a quadrilateral shape to a circle from the nail tail 5 towards the nail head 1. This ensures that when drilling into the board, the nail tail 5 can continue drilling along the transition section 4. However, since the transition section 4 has an upwardly gradually complete thread, the screw is tightened during the drilling process.

[0030] Specifically, the screw tail 5 includes an arc segment 51 and two straight segments 52. The side line of the arc segment 51 is an arc with a fixed curvature, which is a convex curve that bulges outward. The side lines of the two straight segments 52 are a vertical straight segment and an oblique straight segment, respectively. An arc with a fixed curvature, a straight line, and an oblique straight line together form the side line of the screw tail 5. The straight line is set below the arc and transitions smoothly at the intersection point. The oblique straight line is set below the straight line and transitions smoothly at the intersection point. The oblique straight line segment of the screw tail 5 is inclined inward and eventually converges to a point to form the sharp tip of the screw. The oblique straight line segment and the arc segment 51 are helpful for determining the position of the screw when drilling into the plate and providing greater drilling force, while also enlarging the hole in the plate.

[0031] Specifically, refer to Figure 5 The nail tail 5 has a quadrilateral shape with rounded corners in the arc section 7, as shown in the reference. Figure 6 and Figure 7 The shape of the nail tail 5 in the straight section 8 and the oblique straight section 9 is a quadrilateral, a circle or an ellipse with rounded corners.

[0032] Example 2: Specifically, the nail tail 5 is composed of an arc segment 51. The side line of the arc segment 51 is an arc with a fixed curvature. The arc is a convex curve that bulges outward. The arc segment 51 gradually decreases in size along the direction from the nail head 1 to the nail tail 5 and smoothly transitions at the intersection. The cross-sectional shape of the nail tail 5 composed of the arc is a quadrilateral or ellipse with rounded corners.

[0033] During use, align the tip of the screw tail 5 with the position of the plate to be fixed, rotate the drive mechanism, and the screw moves downward to drill and enlarge the plate. Since the screw has a transition section 4 with incomplete threads, the screw will also perform thread hole forming on the plate during the drilling process, and the forming process is smoother. Finally, the plate is tightened and fixed by the thread on the screw 3, realizing the simultaneous pre-drilling, enlarging, thread forming, and tightening on the plate or thin wall, and completing the component connection.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A threaded screw, comprising a head (1), a shank (3), and a tail (5), characterized in that: The top of the nail head (1) is provided with a driving structure (2), and a transition section (4) is provided between the screw (3) and the nail tail (5). The screw (3) is provided with a complete cylindrical thread, and the transition section (4) is provided with an incomplete thread. The nail tail (5) adopts a threadless design. The nail tail (5) includes at least one arc segment (51) or at least one straight segment (52). The cross-sectional shape of the nail tail (5) in the arc segment is quadrilateral and has rounded corners, circles, or ellipses. The incomplete thread on the transition section (4) gradually decreases from the screw (3) to the nail tail (5). The incomplete thread on the transition section (4) is smoothly transitioned with the screw (3) and the nail tail (5).

2. The threaded screw according to claim 1, characterized in that: The nail tail (5) includes an arc segment (51) and two straight segments (52). The side line of the arc segment (51) is an arc with a fixed curvature. The arc is a convex curve that bulges outward. The side lines of the two straight segments (52) are a straight line and an oblique line, respectively.

3. A threaded screw according to claim 2, characterized in that: The side line of the nail tail (5) includes an arc with a fixed curvature, a straight line and a diagonal straight line. The straight line is located below the arc and transitions smoothly at the intersection. The diagonal straight line is located below the straight line and transitions smoothly at the intersection.

4. A threaded screw according to claim 3, characterized in that: The nail tail (5) has a quadrilateral shape with rounded corners in the arc segment (51), and the nail tail (5) has a quadrilateral, circle or ellipse shape with rounded corners in the straight segment (52).

5. A threaded screw according to claim 4, characterized in that: The transition section (6) gradually decreases in size from the nail head (1) to the nail tail (5). The transition section (6) gradually changes from a quadrilateral to a circle from the nail tail (5) towards the nail head (1) and is smoothly connected to the screw (3).

6. A threaded screw according to claim 1, characterized in that: The nail tail (5) is composed of an arc segment (51). The side line of the arc segment (51) is an arc with a fixed curvature. The arc is a convex curve that bulges outward. The arc segment (51) gradually decreases in size along the direction from the nail head (1) to the nail tail (5) and transitions smoothly at the intersection.

7. A threaded screw according to claim 6, characterized in that: The cross-sectional shape of the nail tail (5) formed by the arc is a quadrilateral or an ellipse with rounded corners.

8. A threaded screw according to claim 1, characterized in that: The straight segment (52) of the screw tail (5) forms the sharp tip of the screw, and the cross-section of the screw tip is circular or a chamfered quadrilateral.

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