Multi-thread self-tapping screw

Abstract

The utility model discloses a multi-thread self-tapping screw, and relates to the technical field of screws. Comprising a screw rod I; the clamping head is fixedly arranged at the bent part of the movable clamping block; and the sliding rod is arranged below one side of the movable clamping block. The first screw rod and the second screw rod are designed in a sectional mode, in the using process, the first screw rod and the second screw rod are combined with each other, the drilling action is conducted through the screw tip at the front end of the second screw rod, after drilling embedding is conducted, reverse rotating force can be applied to the first screw rod, under connection of the sliding rod, the second screw rod and the first screw rod are gradually split, and therefore the screw rod can be detached from the first screw rod. The movable clamping blocks on the two sides are pressed after being pulled out, so that the clamping heads on the outer walls of the movable clamping blocks extend outwards and abut against the interiors of the threaded grooves, contact friction between the clamping heads and the threaded grooves is increased, the situation that the whole screw retreats and rotates reversely due to factors such as vibration can be reduced, and the driving connection strength of the whole self-tapping screw is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, in particular to a multi-thread self-tapping screw. Background Technique

[0002] A self-tapping screw is a screw with a drill bit. Through a special electric tool for construction, drilling, tapping, fixing, and locking are completed at one time; self-tapping screws are mainly used for the connection and fixation of some relatively thin sheet parts, such as the connection of color steel plates to color steel plates, the connection of color steel plates to purlins and wall beams, etc.

[0003] Common self-tapping screws adopt a relatively simple screw structure. Drilling is carried out through the rotation of its front end, and a screw groove is formed in the drilling hole to match the self-tapping screw. After the self-tapping screw penetrates into the screw groove, due to vibrations and other reasons, the screw is likely to break away from the screw groove along the spiral hole. Content of the Utility Model

[0004] In view of the deficiencies of the prior art, the utility model provides a multi-thread self-tapping screw, which solves the problems mentioned in the above background.

[0005] The utility model provides the following technical solutions: including: a first screw rod, and slot openings are symmetrically arranged on the surface of the first screw rod;

[0006] A dust-proof part, which is fixedly arranged at the slot opening of the first screw rod, and both ends of the dust-proof part are fixedly connected to the side walls of the slot opening of the first screw rod;

[0007] A movable clamping block, which is movably installed at the slot opening of the first screw rod;

[0008] A clamping head, which is fixedly arranged at the bent part of the movable clamping block;

[0009] A sliding rod, which is arranged below one side of the movable clamping block;

[0010] A pressing part 12, which is fixedly installed at the upper end of the sliding rod.

[0011] Furthermore, a convex block is fixedly arranged on the inner wall of the slot opening of the first screw rod, and the front end of the convex block is close to the movable clamping block.

[0012] Furthermore, a nut is fixedly arranged at the upper end of the first screw rod.

[0013] Furthermore, an extension part is fixedly arranged around the sliding rod at the lower end of the first screw rod, a second screw rod is fixedly arranged at the lower end of the sliding rod, a concave part is arranged on the upper end surface of the second screw rod, and the extension part is in threaded engagement with the concave part.

[0014] Furthermore, a screw tip is fixedly arranged at the lower end of the second screw rod.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] In this application, the screw rod one and the screw rod two are designed in a segmented manner. When in use, the screw rod one and the screw rod two are combined with each other. The drill tip at the front end of the screw rod two is used for drilling. After the drilling and embedding, by applying a reverse rotational force to the screw rod one, under the connection of the sliding rod, the screw rod two and the screw rod one are gradually separated. Thus, after being pulled out, the movable clamping blocks on both sides are pressed, so that the clamping heads on the outer wall of the movable clamping blocks extend outwards and abut against the thread grooves. By increasing the contact friction with the thread grooves through the clamping heads, the situation of the entire screw backing out and reversing due to factors such as vibration can be reduced, and the connection strength driven by the entire self-tapping screw can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a side view of the screw rod one of the present utility model;

[0018] Figure 2 It is a top view of the nut of the present utility model;

[0019] Figure 3 It is a sectional view of the screw rod two of the present utility model;

[0020] Figure 4 It is an enlarged view of the clamping head of the present utility model;

[0021] Figure 5 It is a schematic structural view of the movable clamping block of the present utility model.

[0022] In the figure: 1, nut; 2, screw rod one; 3, screw rod two; 4, drill tip; 5, extension part; 6, concave part; 7, sliding rod; 8, convex block; 9, movable clamping block; 10, clamping head; 11, dust-proof part; 12, pressing part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0024] Please refer to Figures 1-5, including: a first screw rod 2, a thread ring is arranged on the surface of the first screw rod 2, a nut 1 is fixedly arranged at the upper end of the first screw rod 2, and an opening is formed on the surface of the nut 1. The opening corresponds to the top of the thread area of the first screw rod 2. When the first screw rod 2 self-taps into a wall or wood, the powder chips will, along with the rotation of the first screw rod 2, be discharged from the thread grooves on the surface of the first screw rod 2 to the opening of the nut 1. This not only facilitates the discharge of the powder chips, but also enables the first screw rod 2 to be further fixed at the wall or wood, avoiding the influence of the accumulation of powder chips on the fitting surface between the first screw rod 2 and the wall. Moreover, the upper end of the nut 1 is a circular truncated notch sloping downwards, and a cutting knife part is arranged on the surface of the circular truncated cone.

[0025] The surface of the first screw rod 2 is symmetrically provided with notches. The dust-proof part 11 is fixedly arranged at the notches of the first screw rod 2, and both ends of the dust-proof part 11 are fixedly connected to the side walls of the notches of the first screw rod 2. The lower end surface of the dust-proof part 11 is a slope surface inclined towards the convex block 8, which prevents the powder debris generated during the self-tapping of the screw from entering the interior of the first screw rod 2, and at the same time does not affect the movement of the movable block 9. Several clamping heads 10 adapted to the thread turns of the first screw rod 2 are arranged at the bent part of the movable block 9. When the clamping heads 10 are not squeezed by the pressing part 12, the pointed parts thereof are located within the thread turns of the first screw rod 2, so that they will not affect the drilling of the first screw rod 2. Before using the screw, the lower end surface of the movable block 9 is in contact with the upper end surface of the convex block 8. A concave part 6 is provided on the upper end surface of the second screw rod 3, and the concave part 6 meshes with the extension part 5. The movable block 9 is a bent part, and the clamping heads 10 are fixedly arranged on the surface of the movable block 9. The clamping heads 10 can be stuck in the thread grooves formed during the self-tapping of the second screw rod 3 following the movement of the movable block 9. After driving the screw into the wall or wood to be fixed, through the screwdriver slot on the upper end surface of the nut 1, the nut 1 is reversely screwed one turn. In this way, the first screw rod 2 will move upward in the threaded hole, so that the pressing part 12 at the upper end of the sliding rod 7 disengages from the slot of the first screw rod 2, causing the pressing part 12 to approach the movable block 9, and the inclined surface of the pressing part 12 squeezes the inclined surface of the movable block 9. A convex block 8 is fixedly arranged on the inner wall of the notch of the first screw rod 2. The lower end surface of the movable block 9 will be in contact with the upper end surface of the convex block 8. Due to the inclined surface of the pressing part 12 squeezing the inclined surface of the movable block 9, the movable block 9 will displace outward from the first screw rod 2, so that the clamping heads 10 at the bent part of the movable block 9 are stuck in the threaded hole, and the lower end surface of the movable block 9 and the upper end surface of one side of the convex block 8 are slope surfaces. When the nut 1 is reversely screwed, the pressing part 12 at the upper end of the sliding rod 7 presses downward on the slope surface of the movable block 9 and pushes the movable block 9 out of the slot on the surface of the first screw rod 2, making it easier to clamp the threaded hole, increasing the frictional resistance, and making the clamping heads 10 stuck in the thread grooves during the self-tapping of the screw. The lower end of the first screw rod 2 is fixedly provided with an extension part 5 around the sliding rod 7, and a threaded area is arranged inside the extension part 5. The lower end of the sliding rod 7 is fixedly installed on the surface of the center of the upper end of the second screw rod 3, and the concave part 6 is provided with a thread turn corresponding to the extension part 5, so that the extension part 5 and the concave part 6 can mesh and rotate. In this way, when the nut 1 is reversely screwed, the sliding rod 7 will drive the pressing part 12 at its upper end to leave the slot of the first screw rod 2, causing the sliding rod 7 to drive the pressing part 12 to descend, squeezing the movable block 9, and making it displace along the inclination direction of the slope surface at its lower end, so that the clamping heads 10 are stuck in the thread grooves opened during the self-tapping of the second screw rod 3. A screw tip 4 is fixedly arranged at the lower end of the second screw rod 3, and the screw tip 4 can drill holes in the base surface following the rotation of the nut 1.

[0026] Working principle: Align the screw tip 4 with the area to be drilled. Turn the nut 1 with a tool to make the screw tip 4 drill holes in the base surface to be fixed. Then continue to turn the nut 1, and the second screw rod 3 will cut a thread groove at the hole in the base surface. When the first screw rod 2 is driven into the base surface, reverse-turn the nut 1 to make the first screw rod 2 reverse. The extension part 5 at the lower end of the first screw rod 2 will disengage from the concave part 6. At this time, the movable block 9 will be squeezed by the inclined surface of the pressing part 12 due to the descent of the sliding rod 7, so that the pressing part 12 will push it outwards through the ramp surface of the movable block 9. At the same time, the clamping head 10 of the movable block 9 will be clamped into the thread groove opened by the screw. By the front end of 10 protruding outwards, the friction can be increased, thereby reducing the situation of wire withdrawal and improving the stability of the whole screw after reinforcement is completed.

[0027] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-threaded self-tapping screw, comprising: A screw rod (2), wherein the surface of the screw rod (2) is symmetrically provided with grooves; It is characterized by further comprising: The dust shield (11) is fixedly arranged at the notch of the screw rod one (2), and the two ends of the dust shield (11) are fixedly connected to the side walls of the notch of the screw rod one (2); A movable clamping block (9) movably mounted at a notch of the screw rod 1 (2); A clamping head (10) is fixedly mounted on the bent portion of the movable clamping block (9); A slide bar (7) is arranged below one side of the movable block (9); The pressing portion (12) is fixedly mounted on the upper end of the slide bar (7).

2. A multi-threaded self-tapping screw according to claim 1, characterized in that: A protrusion (8) is fixedly provided on the inner wall of the notch of the screw rod 1 (2), and the front end of the protrusion (8) is close to the movable clamping block (9).

3. A multi-threaded self-tapping screw according to claim 1, characterized in that: A nut (1) is fixedly provided at the upper end of the screw rod 1 (2).

4. A multi-threaded self-tapping screw according to claim 1, characterized in that: An extension portion (5) is fixedly provided at the lower end of the screw rod (2) around the slide rod (7), a screw rod (3) is fixedly provided at the lower end of the slide rod (7), a lower recess (6) is provided on the upper end surface of the screw rod (3), and the extension portion (5) is threadedly engaged with the lower recess (6).

5. The multi-thread self-tapping screw according to claim 1, characterized in that: A screw tip (4) is fixedly provided at the lower end of the second screw rod (3).

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