Waterproof combined fastener

Abstract

The utility model discloses a waterproof combined fastener which comprises a countersunk head screw, a waterproof gasket and a fastening screw, a countersunk head screw cap of the waterproof combined fastener can be tightly attached to a mounting hole to prevent water flow from entering the mounting hole from the outer side of the countersunk head screw cap, and the waterproof gasket is pressed on the top end face of the countersunk head screw cap through the fastening screw to shield water above the countersunk head screw. And external water is prevented from being in contact with the countersunk head nut. Under the downward pressing action of the pressing and fixing nut, the annular groove of the countersunk head nut and the first convex ring of the waterproof gasket are tightly embedded, so that liquid cannot pass through the space between the countersunk head screw and the waterproof gasket in a straight line, and the inner threaded hole is protected. The tight fit between the butt-joint slope surface of the waterproof gasket and the concave cavity of the fastening screw not only can prevent the waterproof gasket from loosening from the first screw rod and limit the expansion of a gap, but also enables liquid to be difficult to obliquely and upwards intrude into the inner threaded hole along the butt-joint slope surface, so that the tight fit of the structure in the waterproof combined fastener is realized, and a good waterproof effect is obtained.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to waterproof combination fasteners. Background Technology

[0002] A screw, also known as a bolt, consists of a nut (the head structure) and a threaded section attached to the nut. It is a common fastener widely used in industries such as machinery, power, transportation, and aerospace. Outdoors, due to concerns about rain, the locations where screws are used for fastening often require a certain degree of waterproofing. However, a gap of a certain size exists between the threaded section and the mounting hole. External liquids can enter the component through this gap, causing water accumulation inside the equipment and potentially leading to serious problems such as short circuits.

[0003] In existing technologies, a sealing ring is fitted onto the screw shank to seal the gap between the screw shank and the mounting hole. However, conventional screws and sealing rings generally do not have a tight fit, and gaps can easily appear between the waterproof washer and the screw shank. Water can still seep into the mounting hole through two paths: between the sealing ring and the nut or between the sealing ring and the mounting surface, resulting in insufficient waterproofing. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a waterproof combination fastener to solve the above problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a waterproof combination fastener, which includes a countersunk screw, a waterproof washer, and a fastening screw. The countersunk screw includes a countersunk nut and a first screw connected to the bottom of the countersunk nut. The top end face of the countersunk nut has an internal threaded hole and an annular groove. The internal threaded hole extends toward the first screw, and the bottom of the internal threaded hole has a first screw groove. The annular groove is located around the internal threaded hole. The bottom surface of the waterproof washer protrudes to form a first convex ring that matches the annular groove. The center of the waterproof washer has a through hole, and the top end face of the waterproof washer has an inclined upward convex mating slope around the through hole. The fastening screw includes a clamping nut and a second screw connected to the bottom of the clamping nut. The top of the clamping nut has a second screw groove, and the bottom surface of the clamping nut has a cavity around the second screw that matches the mating slope. The second screw passes through the through hole of the waterproof gasket and is locked into the internal thread hole of the countersunk screw. The countersunk screw presses the waterproof gasket onto the countersunk nut, so that the waterproof gasket covers the countersunk nut. The first convex ring is fitted into the annular groove, and the mating slope is fitted into the concave cavity.

[0007] Preferably, a second protruding ring is formed on the bottom surface of the clamping nut, the second protruding ring is nested outside the waterproof gasket, and the protrusion height of the second protruding ring on the bottom surface of the clamping nut is greater than the thickness of the waterproof gasket.

[0008] Preferably, a shielding plate is sealed on the top surface of the second groove.

[0009] Preferably, the first groove is a hexagonal groove and the second groove is a star-shaped groove.

[0010] Preferably, the top of the clamping nut forms a hemispherical structure, and the side of the clamping nut expands outward around the hemispherical structure to form a hydrophobic side edge.

[0011] Preferably, the radial length of the cavity gradually decreases along the axial direction of the second screw toward the clamping nut.

[0012] Preferably, the waterproof gasket is a rubber gasket or a PVC gasket.

[0013] The technical effects achieved by this utility model include:

[0014] Based on the above-mentioned waterproof combination fastener, the countersunk nut can fit tightly with the mounting hole to prevent water from entering the mounting hole from the outside of the countersunk nut. The second screw passes through the through hole of the waterproof washer and is locked into the internal thread hole of the countersunk screw. Under the action of the clamping nut, the waterproof washer is pressed tightly on the top end face of the countersunk nut, providing double protection for the only path of water intrusion into the mounting hole. The clamping nut can block the water above the countersunk screw, preventing most of the water falling from above from contacting the countersunk nut. The structures work together to achieve better waterproofing.

[0015] Under the pressure of the clamping nut, the annular groove and the first convex ring fit tightly together, preventing liquid from passing in a straight line between the countersunk screw and the waterproof gasket. Instead, the liquid intrudes through a tortuous path, protecting the internal threaded hole.

[0016] The tight fit between the mating slope and the cavity not only prevents the waterproof gasket from loosening from the first screw, but also makes it difficult for liquid to enter the internal threaded hole by tilting upwards along the mating slope, ensuring that the first screw and the internal threaded hole are not prone to rust and have a long-term stable connection. Attached Figure Description

[0017] Figure 1 This is a structural exploded view of the waterproof combined fastener provided in this embodiment of the utility model;

[0018] Figure 2 This is a structural exploded view of the waterproof combination fastener from another perspective;

[0019] Figure 3 This is a three-dimensional structural diagram of the waterproof combined fastener;

[0020] Figure 4 This is a top view of the countersunk screw in the waterproof combination fastener.

[0021] The reference numerals in the above figures are as follows:

[0022] Countersunk screw 1, countersunk nut 11, first screw 12, internal threaded hole 101, annular groove 102, first screw groove 103;

[0023] Waterproof gasket 2, first convex ring 21, mating slope 22, through hole 201;

[0024] Fastening screw 3, clamping nut 31, water-draining side edge 311, second screw 32, second convex ring 33, second screw groove 301, cavity 302;

[0025] 4. Masking plate. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the drawings. The embodiments of this utility model shown in and described with reference to the drawings are merely exemplary, and this utility model is not limited to these embodiments.

[0027] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related are omitted.

[0028] like Figures 1 to 3 As shown, this utility model embodiment provides a waterproof combination fastener, which includes a countersunk screw 1, a waterproof washer 2, and a fastening screw 3.

[0029] The countersunk screw 1 includes a countersunk nut 11 and a first screw 12 connected to the bottom of the countersunk nut 11. The top end face of the countersunk nut 11 has an internal threaded hole 101 and an annular groove 102. The internal threaded hole 101 extends toward the first screw 12, and... Figure 1 and Figure 4As shown, the bottom of the internal threaded hole 101 is provided with a first screw groove 103, and the annular groove 102 is located around the internal threaded hole 101; the waterproof gasket 2 is an elastic gasket, and the bottom surface of the waterproof gasket 2 protrudes to form a first convex ring 21 that matches the annular groove 102. A through hole 201 is provided at the center of the waterproof gasket 2, and the top end face of the waterproof gasket 2 is provided with an inclined upward protruding mating slope 22 around the through hole 201; the fastening screw 3 includes a clamping nut 31 and a second screw 32 connected to the bottom of the clamping nut 31. The top of the clamping nut 31 is provided with a second screw groove 301, and the bottom surface of the clamping nut 31 is provided with a cavity 302 that matches the mating slope 22 around the second screw 32.

[0030] The second screw 32 passes through the through hole 201 of the waterproof gasket 2 and is locked into the internal thread hole 101 of the countersunk screw 1. The countersunk screw 1 presses the waterproof gasket 2 onto the countersunk nut 11, so that the waterproof gasket 2 covers the countersunk nut 11. The first convex ring 21 is fitted into the annular groove 102, and the mating slope 22 is fitted into the cavity 302.

[0031] The working process of the above-mentioned waterproof combination fastener is as follows: the countersunk screw 1 is screwed into the pre-set mounting hole at the installation position by the first groove 103 at the bottom of the internal thread hole 101, so that the countersunk nut 11 is embedded in the mounting hole. Then, the waterproof gasket 2 is put on the first screw 12 of the countersunk screw 1, so that the cavity 302 and the mating slope 22 are fastened. The first screw 12 is locked into the internal thread hole 101 of the countersunk nut 11, and the fastening screw 3 is connected to the countersunk screw 1. The waterproof gasket 2 is pressed on the countersunk screw 1 and covers the countersunk nut 11, so that the gap between the countersunk nut 11 and the mounting hole is also covered by the countersunk nut 11. The clamping nut 31 can block rainwater above the countersunk screw 1. The countersunk nut 11 can fit tightly with the mounting hole to prevent water from entering the mounting hole from the outside of the countersunk nut 11. The waterproof gasket 2 is pressed tightly on the top end face of the countersunk nut 11 under the action of the clamping nut 31, further preventing external water from contacting the countersunk nut 11.

[0032] Under the downward pressure of the clamping nut 31, the annular groove 102 and the first convex ring 21 fit tightly together, preventing the liquid from passing in a straight line between the countersunk screw 1 and the waterproof gasket 2. The intrusion path is tortuous, protecting the internal threaded hole 101.

[0033] The tight fit between the mating slope 22 and the concave cavity 302 not only allows the waterproof gasket 2 to be tightly fitted onto the first screw 12 of the countersunk screw 1, but also prevents liquid from flowing upward along the mating slope 22 into the internal threaded hole 101, ensuring a long-term stable connection between the first screw 12 and the internal threaded hole 101.

[0034] Furthermore, a second protruding ring 33 is formed on the bottom surface of the clamping nut 31. The second protruding ring 33 is nested outside the waterproof gasket 2. The protrusion height of the second protruding ring 33 on the bottom surface of the clamping nut 31 is greater than the thickness of the waterproof gasket 2, so that the clamping nut 31 fastens the waterproof gasket 2, enhancing the connection stability while the clamping nut 31 also serves to cover the waterproof gasket 2.

[0035] In this embodiment, a shielding plate 4 is sealed on the top surface of the second screw groove 301 to prevent the second screw groove 301 from getting damp and rusting, extend the service life of the second screw groove 301, and prevent others from seeing and arbitrarily turning it after tightening the fastening screw 3 through the second screw groove 301. The shielding plate 4 also has a fixing post that extends downward and is inserted into the second screw groove 301 for locking.

[0036] For example, the first groove 103 is a hexagonal groove and the second groove 301 is a star-shaped groove. Of course, in actual use, other shapes of grooves can be set according to requirements.

[0037] Specifically, the top of the clamping nut 31 forms a hemispherical structure, and the side of the clamping nut 31 expands outward around the hemispherical structure to form a hydrophobic side edge 311. The hemispherical structure facilitates the liquid that comes into contact with the clamping nut 31 to slide down and then be guided outward by the hydrophobic side edge 311.

[0038] Along the axial direction of the second screw 32 toward the clamping nut 31, the radial length of the cavity 302 gradually decreases, that is, the cavity 302 is funnel-shaped, which is conducive to the interference fit with the mating slope 22 and further prevents the waterproof gasket 2 from loosening and causing gaps.

[0039] The waterproof gasket 2 has an elastic structure. The waterproof washer 2 can also prevent the inner end face of the nut from directly applying excessive pressure to the surface of the installation location, reducing the possibility of damage to the installation location, and can play a buffering and protective role for the installation surface. For example, the waterproof gasket 2 is a rubber gasket or a PVC gasket.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A waterproof combination fastener, characterized in that, include: A countersunk screw (1) includes a countersunk nut (11) and a first screw (12) connected to the bottom of the countersunk nut (11). The top end face of the countersunk nut (11) is provided with an internal thread hole (101) and an annular groove (102). The internal thread hole (101) extends toward the first screw (12). The bottom of the internal thread hole (101) is provided with a first screw groove (103). The annular groove (102) is located around the internal thread hole (101). Waterproof gasket (2), the bottom surface of the waterproof gasket (2) protrudes to form a first convex ring (21) that matches the annular groove (102), a through hole (201) is provided at the center of the waterproof gasket (2), and an inclined upward raised mating slope (22) is provided around the through hole (201) on the top end face of the waterproof gasket (2). The fastening screw (3) includes a clamping nut (31) and a second screw (32) connected to the bottom of the clamping nut (31). The top of the clamping nut (31) is provided with a second screw groove (301), and the bottom surface of the clamping nut (31) is provided with a cavity (302) around the second screw (32) that is adapted to the mating slope (22). The second screw (32) passes through the through hole (201) of the waterproof gasket (2) and is locked into the internal thread hole (101) of the countersunk screw (1). The countersunk screw (1) presses the waterproof gasket (2) onto the countersunk nut (11), so that the waterproof gasket (2) covers the countersunk nut (11). The first convex ring (21) is fitted into the annular groove (102), and the mating slope (22) is fitted into the cavity (302).

2. The waterproof combination fastener according to claim 1, characterized in that, The bottom surface of the clamping nut (31) has a second protruding ring (33) that is nested outside the waterproof gasket (2). The protrusion height of the second protruding ring (33) on the bottom surface of the clamping nut (31) is greater than the thickness of the waterproof gasket (2).

3. The waterproof combination fastener according to claim 1, characterized in that, A shielding plate (4) is sealed on the top surface of the second screw groove (301).

4. The waterproof combination fastener according to claim 1, characterized in that, The first groove (103) is a hexagonal groove, and the second groove (301) is a star-shaped groove.

5. The waterproof combination fastener according to claim 1, characterized in that, The top of the clamping nut (31) forms a hemispherical structure, and the side of the clamping nut (31) expands outward around the hemispherical structure to form a hydrophobic side edge (311).

6. The waterproof combination fastener according to claim 1, characterized in that, Along the axial direction of the second screw (32) toward the clamping nut (31), the radial length of the cavity (302) gradually decreases.

7. The waterproof combination fastener according to claim 1, characterized in that, The waterproof gasket (2) is a rubber gasket or a PVC gasket.

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