Self-tapping and self-drilling screw

Abstract

The utility model discloses a self-tapping and self-drilling screw which comprises a screw head and a screw rod, the screw head and the screw rod are welded, a plurality of chip grooves are arranged on the screw rod, the chip grooves extend to the screw head, a sliding groove is arranged in the screw rod, and a rotating shaft is rotatably connected in one of the chip grooves. Through cooperative arrangement of an inclined plate, a gear and a rack, after a screw rod is drilled into a mounting surface, a screw head is gradually close to the mounting surface, when the screw head is about to be in contact with the mounting surface, the inclined plate collides with the mounting surface firstly so as to rotate to block a chip groove, and the gear drives the rack to move upwards to expose a through hole, so that waste chips enter a sliding groove through the through hole; therefore, when the screw head is in contact with a mounting surface, the surface of the screw head is prevented from being damaged by scraps; through the cooperative arrangement of the extrusion plate, the clamping groove and the clamping block, after the rack moves upwards, the extrusion plate extrudes the rotating block, so that the clamping block is separated from the clamping groove, the rotating block can not drive the screw rod to rotate any more, the screw is not screwed into the mounting surface, and the purpose of protecting the screw head is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of self-drilling and self-tapping screws, in particular to a self-drilling and self-tapping screw. Background Art

[0002] Self-drilling screws are usually made of carbon steel, stainless steel, copper, copper alloy and other materials. They are often used in various installation occasions because of their high strength, good corrosion resistance and strong penetration.

[0003] The prior art self-drilling screws are usually provided with chip grooves to prevent the discharge of waste chips generated by drilling, so that the self-drilling screws can be installed on some thicker installation surfaces. However, the discharged chips often rub against the screw head when the screw is about to be installed, causing the rust-resistant layer on the screw head to be damaged. Utility Model Content

[0004] Based on this, it is necessary to provide a self-drilling screw to address the above technical problems.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a self-drilling and self-tapping screw, including a screw head and a screw rod, the screw head and the screw rod are welded, a plurality of chip grooves are provided on the screw rod, the chip grooves extend to the screw head, a slide groove is provided in the screw rod, a rotating shaft is rotatably connected in one of the chip grooves, the rotating shaft extends into the slide groove, an inclined plate is installed at one end of the rotating shaft, the length of the inclined plate is adapted to the width of the chip groove, a gear is installed on the rotating shaft, an annular baffle is slidably connected in the slide groove, a through hole is provided in the chip groove, the annular baffle is matched with the through hole, a rack is installed on the annular baffle, the gear is meshed with the rack, a plastic fixing strip is installed in the slide groove, and the plastic fixing strip is connected to the gear.

[0006] Preferably, an annular groove is provided in the screw head, a rotating block is slidably connected in the annular groove, a cross groove is provided on the rotating block, a plurality of clamping grooves are provided at the bottom of the annular groove, a plurality of clamping blocks are installed on the rotating block, the clamping block slides in the clamping groove, an extrusion plate is slidably connected in the slide groove, and the extrusion plate is connected to the top of the rack.

[0007] Preferably, both ends of the inclined plate are chamfered.

[0008] Preferably, the side of the inclined plate that first contacts the mounting surface is chamfered.

[0009] Preferably, a sealing layer is provided on the inner wall of the annular groove.

[0010] Preferably, the screw head and the outer wall of the rotating block are sprayed with polyolefin coating.

[0011] Compared with the prior art, this technical solution has at least one of the following beneficial effects:

[0012] Through the coordinated arrangement of the inclined plate, the gear and the rack, after the screw is drilled into the mounting surface, the screw head gradually approaches the mounting surface. When the screw head is about to contact the mounting surface, the inclined plate collides with the mounting surface first, thereby rotating to block the chip discharge groove, and the gear drives the rack to move upward to expose the through hole, so that the waste chips enter the slide groove through the through hole, thereby avoiding the waste chips from damaging the surface of the screw head when it contacts the mounting surface;

[0013] Through the matching arrangement of the extrusion plate, the slot and the block, when the rack moves upward, the extrusion plate squeezes the rotating block, causing the block to disengage from the slot, so that the rotating block can no longer drive the screw to rotate, and the screw no longer screws into the mounting surface, thereby protecting the screw head. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front cross-sectional view of an embodiment of the utility model;

[0015] Figure 2 For an embodiment of the utility model Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3 For an embodiment of the utility model Figure 1 Enlarged view of point B in the middle;

[0017] Figure 4 A three-dimensional diagram of an embodiment of the utility model;

[0018] Figure 5 A three-dimensional diagram of an inclined plate and a rotating shaft according to an embodiment of the present utility model;

[0019] In the figure, 1, screw head; 2, screw rod; 3, chip groove; 4, slide groove; 5, rotating shaft; 6, inclined plate; 7, gear; 8, annular baffle; 9, through hole; 10, rack; 11, plastic fixing strip; 12, annular groove; 13, rotating block; 14, cross groove; 15, slot; 16, block; 17, extrusion plate; 18, sealing layer. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0021] See also Figures 1 to 5The embodiment of the present application provides a self-drilling and tapping screw, including a screw head 1 and a screw rod 2, which are welded together. The screw rod 2 is provided with a plurality of chip grooves 3, which extend to the screw head 1. A slide groove 4 is provided in the screw 2, which extends to the screw head 1. A rotating shaft 5 is rotatably connected in one of the chip grooves 3, and the rotating shaft 5 extends into the slide groove 4. An inclined plate 6 is installed at one end of the rotating shaft 5, and the inclined plate 6 is located in the chip groove 3. The length of the inclined plate 6 is adapted to the width of the chip groove 3. A gear 7 is installed on the rotating shaft 5, and the gear 7 is located in the slide groove 4. An annular baffle 8 is slidably connected in the slide groove 4. A through hole 9 is provided in the chip groove 3, and the annular baffle 8 is matched with the through hole 9. A rack 10 is installed on the annular baffle 8, and the gear 7 is meshed with the rack 10. A plastic fixing strip 11 is installed in the slide groove 4, and the plastic fixing strip 11 is connected to the gear 7.

[0022] When the screw rod 2 is drilled into the mounting surface, a plurality of chip removal grooves 3 continuously discharge waste chips outward. When the screw head 1 is about to contact the mounting surface, the part of the chip removal groove 3 and the screw head 1 on the inclined plate 6 first contacts the mounting surface, thereby causing the inclined plate 6 to rotate by extrusion, and the rotated inclined plate 6 blocks the chip removal groove 3; when the inclined plate 6 is in a flush state and blocks the chip removal groove 3, the collision friction between the inclined plate 6 and the mounting surface is minimized; and when the inclined plate 6 rotates, it will drive the gear 7 installed on the rotating shaft 5 to rotate together, thereby the gear 7 is meshed with the rack 10 through the meshing connection, so that the rack 10 slides upward in the slide groove 4, and the sliding rack 10 drives the annular baffle plate 8 to move upward, so that the through hole 9 originally blocked by the annular baffle plate 8 is exposed, and the waste chips can enter the slide groove 4 from the through hole 9, thereby not affecting the installation effect; the plastic fixing strip 11 makes the inclined plate 6 not contact the mounting surface, and the small external force applied to the inclined plate 6 will not cause the inclined plate 6 to rotate.

[0023] In some embodiments, in order to further prevent the screw head 1 from being damaged, an annular groove 12 is provided in the screw head 1. The annular groove 12 is a through groove. A rotating block 13 is slidably connected in the annular groove 12. A cross groove 14 is provided on the rotating block 13. A plurality of clamping grooves 15 are provided at the bottom of the annular groove 12. A plurality of clamping blocks 16 are installed on the rotating block 13. The clamping blocks 16 slide in the clamping groove 15. An extrusion plate 17 is slidably connected in the slide groove 4. The extrusion plate 17 is connected to the top of the rack 10. During installation, the block 16 is stuck in the slot 15, so that the installation tool drives the screw head 1 to drive the screw rod 2 to be installed through the cross slot 14 on the rotating block 13. When the rack 10 is driven upward by the gear 7, the extrusion plate 17 squeezes the rotating block 13, causing the block 16 to slide out of the slot 15 and enter the annular groove 12. Therefore, when the installation tool drives the rotating block 13 to rotate again, it will no longer drive the screw to rotate; during the transportation of the screw, the block 16 may be disengaged, and it is only necessary to rotate the rotating block 13 and then slide it into the slot 15; and after the inclined plate 6 becomes flush, the transmission of the gear 7 and the rack 10 etc. still requires a certain amount of time, so that the screw can continue to be screwed into the installation surface, so that the flush inclined plate 6 abuts against the installation surface, making it difficult for the installed screw to be pressed back into the slot 15 by the installation tool.

[0024] In some embodiments, to facilitate the rotation of the inclined plate 6, both ends of the inclined plate 6 are chamfered.

[0025] In some embodiments, in order to prevent the inclined plate 6 from being damaged when it contacts the mounting surface after the inclined plate 6 becomes flush and blocks the chip groove 3, the side of the inclined plate 6 that contacts the mounting surface first is chamfered. Thus, after the inclined plate 6 rotates, it is flush with the outer wall of the screw head 1 and contacts the mounting surface.

[0026] In some embodiments, in order to facilitate rust-proofing of the screw 2 , a sealing layer 18 is provided on the inner wall of the annular groove 12 .

[0027] In some embodiments, in order to facilitate anti-corrosion and anti-rust treatment of the screw, the outer wall of the screw head 1 and the rotating block 13 are sprayed with polyolefin coating.

[0028] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0029] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A self-drilling screw, comprising a screw head (1) and a screw rod (2), wherein the screw head (1) and the screw rod (2) are welded, and the screw rod (2) is provided with a plurality of chip removal grooves (3), wherein the chip removal grooves (3) extend to the screw head (1). It is characterized in that The screw rod (2) is provided with a slide groove (4), one of which is rotatably connected to a rotating shaft (5) in a chip groove (3), the rotating shaft (5) extending into the slide groove (4), one end of the rotating shaft (5) is provided with an inclined plate (6), the length of the inclined plate (6) is adapted to the width of the chip groove (3), a gear (7) is provided on the rotating shaft (5), an annular baffle (8) is slidably connected to the slide groove (4), a through hole (9) is provided in the chip groove (3), the annular baffle (8) is matched with the through hole (9), a rack (10) is provided on the annular baffle (8), the gear (7) is meshingly connected to the rack (10), a plastic fixing strip (11) is provided in the slide groove (4), and the plastic fixing strip (11) is connected to the gear (7).

2. The self-drilling screw according to claim 1, It is characterized in that The screw head (1) is provided with an annular groove (12), a rotating block (13) is slidably connected in the annular groove (12), a cross groove (14) is provided on the rotating block (13), a plurality of clamping grooves (15) are provided at the bottom of the annular groove (12), a plurality of clamping blocks (16) are mounted on the rotating block (13), the clamping blocks (16) slide in the clamping grooves (15), an extrusion plate (17) is slidably connected in the slide groove (4), and the extrusion plate (17) is connected to the top of the rack (10).

3. The self-drilling screw according to claim 1, It is characterized in that Both ends of the inclined plate (6) are chamfered.

4. The self-drilling screw according to claim 1, It is characterized in that The inclined plate (6) is chamfered on one side that contacts the mounting surface.

5. The self-drilling screw according to claim 2, It is characterized in that The inner wall of the annular groove (12) is provided with a sealing layer (18).

6. The self-drilling screw according to claim 1, It is characterized in that The outer walls of the screw head (1) and the rotating block (13) are sprayed with polyolefin coating.

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