Grounding screw

Abstract

The utility model relates to the technical field of screws, in particular to a grounding screw. The utility model provides a grounding screw which comprises a screw head, a stud arranged on the screw head and a paint scraping piece arranged on the screw head. A sealing ring is arranged on the stud, and an inclined ring inclined towards the direction of the stud is arranged on the sealing ring; and the paint scraping sheet penetrates through the sealing ring. The technical problem that in the prior art, a screw cannot be prevented from rusting after paint is scraped off is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, in particular to a grounding screw. Background Art

[0002] Ground screws play a crucial role in electrical installations, ensuring both equipment and personnel safety. Ground screws securely connect electrical installations to the ground, establishing a safe and reliable current loop and protecting both the installation and personnel from electric shock. During operation, the flow of current is accompanied by an increase in electromagnetic fields. If the installation is not properly grounded, these increased electromagnetic fields can cause static electricity to accumulate and voltage to rise, posing a threat to personnel and the installation. The ground screw effectively connects the installation to the earth, ensuring a stable ground connection and preventing accidents such as electric shock.

[0003] A Chinese utility model patent, published on September 23, 2009, with publication number CN201314321Y, discloses a safety grounding screw for microwave oven covers. The screw head comprises a spherical surface with a plurality of pointed cones on its lower surface. This structure allows the pointed cones on the screw head to penetrate the powder coating on the cover surface when the grounding wire is crimped to the microwave oven cover, ensuring good contact with the cover sheet metal and ensuring effective grounding. Furthermore, when tightening the screw, the pointed cones penetrate the powder coating and the cover sheet metal surface from shallow to deep. The applied force causes the pointed cones to deform slightly, increasing friction and preventing them from sliding out in the opposite direction, effectively preventing the screw from loosening. However, scraping off the powder coating in this patent can cause the device to rust.

[0004] Therefore, it is necessary to propose a grounding screw that can scrape paint and is rust-proof. Summary of the Invention

[0005] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and provide a grounding screw, which aims to solve the technical problem in the prior art that the screw cannot be prevented from rusting after the paint is scraped off.

[0006] To achieve the above-mentioned purpose, the utility model proposes a grounding screw, comprising a screw head, a stud arranged on the screw head, and a paint scraper arranged on the screw head; a sealing ring is arranged on the stud, and an inclined ring inclined toward the stud is arranged on the sealing ring; the paint scraper passes through the sealing ring.

[0007] Preferably, the width of the paint scraper gradually decreases along the direction in which the stud is tightened; the side of the paint scraper close to the stud is an arc surface; the arc surface includes a first arc surface and a second arc surface; the first arc surface gradually extends away from the stud, and the second arc surface extends toward the stud.

[0008] Preferably, there are two or more paint scrapers that are evenly distributed on the screw head.

[0009] Preferably, a stud hole for the stud to pass through is provided at the center of the sealing ring; and a paint scraping hole for the paint scraping blade to pass through is provided on the sealing ring.

[0010] Preferably, a limiting ring is provided on the sealing ring, and arcs are provided on the corners of the limiting ring.

[0011] Preferably, a groove is provided at the bottom of the limiting ring, the depression degree of the groove gradually decreases from the center to the periphery, and the outermost edge of the groove coincides with the outermost edge of the paint scraper.

[0012] Preferably, the limiting ring and the tilting ring are connected via a connecting ring; a notch is provided at the bottom between the connecting ring and the tilting ring; and arc chamfers are provided at the corners of the bottom of the connecting ring.

[0013] Preferably, when the grounding screw is not in use, the inclined ring is longer than the paint scraping blade along the direction of the stud; after the grounding screw is tightened, the inclined ring is bent and shorter than the paint scraping blade along the direction of the stud.

[0014] Compared with the prior art, the grounding screw provided by the present invention has the following beneficial effects:

[0015] 1. When using a grounding screw, the paint scraper can scrape off paint or other debris covering the metal surface, allowing the metal to contact the grounding screw and conduct electricity, thus achieving better grounding. The paint scraper gradually becomes narrower as the stud is tightened. When tightening, it scrapes the paint. When loosening, the wider side can provide greater reaction, achieving a loosening prevention effect.

[0016] 2. When the grounding screw is in use, the tilted ring is initially longer than the paint scraper. During the tightening process, the tilted ring slowly tilts, and the paint scraper scrapes the paint, while the tilted ring seals the gap between the grounding screw and the metal surface, which can prevent dust and rainwater from entering and achieve better anti-rust function.

[0017] The features and advantages of the present invention will be described in detail through embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of the grounding screw according to an embodiment of the present invention.

[0019] Figure 2 It is a top view of the grounding screw according to an embodiment of the present utility model.

[0020] Figure 3 It is a schematic cross-sectional structural diagram of a paint scraper and a sealing ring according to an embodiment of the present utility model.

[0021] Figure 4 It is a schematic cross-sectional structure diagram of a sealing ring according to an embodiment of the present utility model.

[0022] Figure 5 It is a schematic diagram of the enlarged structure at point A.

[0023] in:

[0024] 1-screw head; 2-stud; 3-paint scraper; 31-first arc surface; 32-second arc surface; 4-sealing ring; 41-tilt ring; 42-stud hole; 43-paint scraper hole; 44-limiting ring; 45-groove; 46-connecting ring; 47-notch. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples. However, it should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0026] In the description of this utility model, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0027] In the description of the present utility model, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0028] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] See Figure 1-3 The present invention provides a grounding screw comprising a screw head 1, a stud 2 disposed on the screw head 1, and a paint scraper 3 disposed on the screw head 1. The paint scraper 3 can scrape away impurities or paint on the metal surface to be grounded when the screw is tightened, thereby achieving better conductivity and thus better grounding. The stud 2 is provided with a sealing ring 4. When the paint on the metal surface is scraped off and directly exposed to humid air, the exposed area will rust. However, the sealing ring seals the gap between the screw head 1 and the metal surface, preventing the exposed metal surface from rusting.

[0030] See Figure 3, the sealing ring 4 is provided with an inclined ring 41 inclined toward the stud 2; the paint scraper 3 passes through the sealing ring 4, and a stud hole 42 for the stud 2 to pass through is provided at the center of the sealing ring 4. The sealing ring 4 is provided with a paint scraper hole 43 for the paint scraper 3 to pass through. When the grounding screw is not in use, the inclined ring 41 is longer than the paint scraper 3 along the direction of the stud 2. After the grounding screw is tightened, the inclined ring 41 bends and becomes shorter than the paint scraper 3 along the direction of the stud 2. Specifically, the initial state of the grounding screw is as follows Figure 3 As shown, the tilted ring 41 is vertically taller than the paint scraping blade 3. As the ring is gradually tightened, it tilts toward the center, allowing the paint scraping blade 3 to slowly come into contact with the metal surface being scraped. After tightening, the tilted ring 41 fills the gap created by the height of the paint scraping blade 3, preventing rust from forming on the metal surface after the paint is scraped.

[0031] See Figure 2 In an optional embodiment, the paint scraping blade 3 gradually becomes smaller in width along the direction in which the stud 2 is tightened, forming a pointed end at one end and a horizontal end at the other end.

[0032] Specifically, when tightening the ground screw, the paint scraper blade 3 rotates with the tip leading and the horizontal end trailing, making it easier to scrape paint. However, when loosening the ground screw, the paint scraper blade 3 rotates with the horizontal end leading and the tip trailing, requiring greater force and providing a better anti-loosening effect.

[0033] See Figure 2 In an optional embodiment, at least two paint scrapers 3 are provided and evenly distributed on the screw head 1. If there is only one paint scraper 3, the screw tightening process may be unstable, which may easily cause tilting and poor sealing effect. Preferably, there are four paint scrapers 3 evenly distributed on the bottom of the screw head 1.

[0034] See Figure 3 In an optional embodiment, the sealing ring 4 is provided with a limit ring 44 having arc-shaped corners. When tightened, the arc of the limit ring 44 abuts against the tilting ring 41. Since the sealing ring 4 is made of rubber, the limit ring 44 limits its range of movement. If the tilting ring 41 remains movable during tightening, the sealing effect will be poor.

[0035] See Figure 2 and Figure 3In an optional embodiment, the side of the paint scraping blade 3 closest to the stud 2 is an arc-shaped surface; this arc-shaped surface includes a first arc-shaped surface 31 and a second arc-shaped surface 32. The first arc-shaped surface 31 gradually extends away from the stud 2, while the second arc-shaped surface 32 extends toward the stud 2. A groove 45 is provided at the bottom of the retaining ring 44. The groove 45 gradually decreases in depth from the center toward the periphery, and the outermost edge of the groove 45 coincides with the outermost edge of the paint scraping blade 3.

[0036] Specifically, the first arcuate surface 31 and the second arcuate surface 32 form a guide surface, allowing scraped paint and impurities to flow along the guide surface toward the center and into the underside of the groove 45. This prevents impurities from getting stuck during tightening, preventing screw tightening. The outer ring of the groove 45 coincides with the circle formed by the outer edges of all the paint scraping blades 3. Any small amount of paint that doesn't flow along the guide surface to the center can be moved into the underside of the groove 45 without interfering with screw tightening.

[0037] See Figure 4 and Figure 5 In an optional embodiment, the retaining ring 44 and the tilting ring 41 are connected by a connecting ring 46. A notch 47 is provided at the bottom between the connecting ring 46 and the tilting ring 41. The corners of the bottom of the connecting ring 46 are provided with arc chamfers. The notch 47 facilitates the tilting of the tilting ring 41.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A grounding screw comprising a screw head (1), a stud (2) arranged on the screw head (1), and a paint scraper (3) arranged on the screw head (1); characterized in that: A sealing ring (4) is provided on the stud (2), and an inclined ring (41) inclined toward the stud (2) is provided on the sealing ring (4); the paint scraper (3) passes through the sealing ring (4).

2. A grounding screw according to claim 1, characterized in that: The width of the paint scraper (3) gradually decreases along the direction in which the stud (2) is tightened; the side of the paint scraper (3) close to the stud (2) is an arc surface; the arc surface includes a first arc surface (31) and a second arc surface (32); the first arc surface (31) gradually extends away from the stud (2), and the second arc surface (32) extends towards the stud (2).

3. The grounding screw according to claim 1, wherein: More than two paint scrapers (3) are provided and are evenly distributed on the screw head (1).

4. The grounding screw according to claim 1, wherein: The center of the sealing ring (4) is provided with a stud hole (42) for the stud (2) to pass through; and the sealing ring (4) is provided with a paint scraping hole (43) for the paint scraping blade (3) to pass through.

5. The grounding screw according to claim 1, wherein: A limiting ring (44) is provided on the sealing ring (4), and a circular arc is provided on the corner of the limiting ring (44).

6. The grounding screw according to claim 5, characterized in that: A groove (45) is provided at the bottom of the limiting ring (44), and the degree of depression of the groove (45) gradually decreases from the center to the periphery, and the outermost edge of the groove (45) coincides with the outermost edge of the paint scraping piece (3).

7. The grounding screw according to claim 5, wherein: The limiting ring (44) and the tilting ring (41) are connected via a connecting ring (46); a notch (47) is provided at the bottom between the connecting ring (46) and the tilting ring (41); and a circular arc chamfer is provided at the corner of the bottom of the connecting ring (46).

8. The grounding screw according to claim 1, wherein: When the grounding screw is not in use, the tilted ring (41) is longer than the paint scraping blade (3) along the direction of the stud (2); after the grounding screw is tightened, the tilted ring (41) is bent and shorter than the paint scraping blade (3) along the direction of the stud (2).

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