Countersunk screw

Abstract

The utility model discloses a countersunk head screw which comprises a screw rod and a countersunk head nut, a step screwing groove is formed in the upper end face of the countersunk head nut, the step screwing groove comprises an upper-layer hexagonal groove and a lower-layer linear groove from top to bottom, and the lower-layer linear groove is formed in the groove bottom of the upper-layer hexagonal groove. In the radial direction of the countersunk head nut, upper-layer straight-line-shaped grooves are further formed in the groove walls of the two sides of the upper-layer hexagonal groove to form two inward-concave structures in the radial direction, so that a plurality of screwing grooves can be selected to screw countersunk head screws which are immersed into objects and have relatively large resistance, and other screwing grooves can be used for standby application; the situation that the countersunk head screw cannot be taken out of an object due to screw loosening of the screwing groove is avoided. An annular mounting groove is formed in the countersunk head nut, a shielding gasket is arranged above the stepped screwing groove in a covering mode, the shielding gasket is embedded into the annular mounting groove through an annular flange of the shielding gasket to be fixed, the surface can be kept flat, no groove hole is exposed, the shielding gasket is neat and attractive, the external environment can be isolated, and the internal stepped groove is prevented from being oxidized and eroded.

Description

Technical Field

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

[0002] Countersunk screws, also known as flat machine screws, are a common fastener. Conventional screws are installed into preset holes on the surface of an object, with the nut of the screw exposed above the surface of the object being fixed. The opening size of the preset hole matches the thread of the screw. After the countersunk screw is installed in the preset hole of the object, the nut sinks to be flush with the surface of the object. The preset hole forms a countersunk structure, which keeps the surface of the object flat and the overall surface of the object looks neat. This is also the advantage of the countersunk screw.

[0003] To insert a countersunk screw into an object, a tool groove is usually opened on the end face of the nut, rather than tightening the nut by twisting the side of the nut, such as an external hexagonal nut. Otherwise, the countersunk screw will not be completely screwed in due to the object blocking the position. Therefore, the countersunk screw generally forms an exposed tool groove, which makes the tool groove relatively susceptible to external environmental erosion. As the countersunk screw is used for a longer time, if it is twisted frequently, it is easy to cause the tool groove to wear and slip. The countersunk screw immersed in the object will encounter greater resistance, making it difficult to remove from the object. Utility Model Content

[0004] In view of this, an object of the present invention is to provide a countersunk screw to solve the above problem.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a countersunk screw, which comprises a screw rod and a countersunk nut connected to one end of the screw rod. A stepped screw groove is provided at the center of the upper end surface of the countersunk nut facing away from the screw rod, and the stepped screw groove comprises an upper hexagonal groove and a lower slotted groove from top to bottom, and the lower slotted groove is provided at the bottom of the upper hexagonal groove, and along the radial direction of the countersunk nut, the groove walls on both sides opposite to each other of the upper hexagonal groove are also provided with an upper slotted groove, forming two inwardly concave structures along the radial direction, and the upper slotted groove and the lower slotted groove are respectively located in different radial directions of the countersunk nut, and the countersunk nut is provided with an annular mounting groove along its outer peripheral edge, and a shielding gasket is provided above the stepped screw groove, and the outer peripheral edge of the shielding gasket extends downward to form an annular flange protruding from the surface of the shielding gasket, and the shielding gasket is embedded in the annular mounting groove by its annular flange for fixing.

[0007] Preferably, the upper end surface of the countersunk nut is circular, the center of the stepped screw groove is located at the center of the circle of the upper end surface of the countersunk nut, and the annular flange of the shielding gasket is in a circular ring shape.

[0008] Preferably, along the direction toward the screw rod, the countersunk nut is a funnel-shaped structure with a gradually decreasing area.

[0009] Preferably, the upper surface of the shielding gasket covering the stepped screw groove is flush with the height of the outer peripheral edge of the countersunk nut.

[0010] Preferably, the widths of the upper and lower grooves are equal.

[0011] Preferably, the annular flange of the shielding gasket is an elastic rubber ring.

[0012] Preferably, the surface of the countersunk nut is provided with a zinc coating.

[0013] The technical effects achieved by the technical solution of the utility model mainly include:

[0014] The countersunk screw has a relatively wide and deep space on the countersunk nut, and a stepped groove including an upper hexagonal groove, an upper slotted groove and a lower slotted groove is provided. The operator can select multiple screwing grooves to screw the countersunk screw with relatively large resistance immersed in the object. Even if one of the screwing grooves is worn and loosened due to the increase of use time and erosion by the external environment, the other screwing grooves can be used as spare screwing grooves to be screwed at any time, so as to avoid the countersunk screw being unable to be taken out from the object due to the loosening of the screwing groove;

[0015] After the countersunk screw is installed into the object, the annular flange of the shielding gasket can be embedded into the annular mounting groove of the countersunk nut, so that the shielding gasket covers the top of the step groove and is fixed. Even if the multi-slot setting of the step groove increases the exposed area of ​​the countersunk nut, the shielding gasket can be used to keep the countersunk screw and the surface of the object flat without exposed slot holes, thereby maintaining the overall neatness and beauty, and the step groove can be isolated from the external environment to prevent the internal step groove from being eroded by oxidation, thereby playing a protective role. In addition, covering the step groove can also have an anti-theft effect to prevent unauthorized personnel from twisting it at will after seeing the step groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural disassembled diagram of a countersunk screw provided in an embodiment of the utility model;

[0017] Figure 2 is a stereoscopic diagram of the countersunk screw;

[0018] Figure 3 It is a schematic diagram of the structure of the countersunk nut in the countersunk screw;

[0019] Figure 4 It is a schematic diagram of the structure of the shielding gasket in the countersunk screw.

[0020] The reference numerals in the above drawings are:

[0021] Countersunk nut 1, stepped groove 10, upper hexagonal groove 101, lower slot 102, upper slot 103, annular mounting groove 11, upper end surface 1a of countersunk nut, screw 2, shielding gasket 3, annular flange 31. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the utility model shown in the accompanying drawings and described according to the accompanying drawings are merely exemplary, and the utility model is not limited to these embodiments.

[0023] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only 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 very relevant are omitted.

[0024] Reference Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a countersunk screw, which includes a countersunk nut 1 and a screw rod 2 , wherein the countersunk nut 1 is connected to one end of the screw rod 2 .

[0025] Combined diagram Figure 3 As shown, a stepped groove 10 is provided at the center of the upper end surface 1a of the countersunk nut 1 facing away from the screw rod 2. The stepped groove 10 includes an upper hexagonal groove 101 and a lower slotted groove 102 from top to bottom. The lower slotted groove 102 is provided at the bottom of the upper hexagonal groove 101. Along the radial direction of the countersunk nut 1, upper slotted grooves 103 are further provided on the opposite side groove walls of the upper hexagonal groove 101, forming two inwardly recessed structures of the upper hexagonal groove 101 along the radial direction. The upper slotted groove 103 and the lower slotted groove 102 are respectively located in different radial directions of the countersunk nut 1.

[0026] Combination Figure 4 As shown, the countersunk nut 1 is formed with an annular mounting groove 11 along its outer peripheral edge, and a shielding gasket 3 is provided above the stepped groove 10. The outer peripheral edge of the shielding gasket 3 extends downward to form an annular flange 31 protruding from the surface of the shielding gasket 3, and the shielding gasket 3 is embedded in the annular mounting groove 11 by its annular flange 31 for fixation.

[0027] The countersunk screw is based on a relatively wide and deep space on the countersunk nut 1, and is provided with a stepped groove 10 including an upper hexagonal groove 101, an upper slotted groove 103 and a lower slotted groove 102, i.e., a stepped hole structure. An operator can use a wrench or a slotted screwdriver to tighten the countersunk nut 1, and can select multiple screw grooves to tighten the countersunk screw with relatively large resistance immersed in an object. Even if one of the screw grooves is worn and loose due to the increase of use time and erosion by the external environment, the other screw grooves can also be used as spare screw grooves to be tightened at any time, so as to avoid the countersunk screw being unable to be taken out of the object due to the screw groove loosening. After the twisting is completed, the annular flange 31 of the shielding gasket 3 can be embedded into the annular mounting groove 11 of the countersunk nut 1, so that the shielding gasket 3 covers the step groove 10 and is fixed. Even if the multi-groove setting of the step groove 10 increases the exposed area on the countersunk nut 1, the shielding gasket 3 can be used to keep the countersunk screw and the surface of the object flat without exposed groove holes, and the overall cleanliness can be maintained. The step groove 10 can also be isolated from the external environment to avoid oxidation corrosion and play a protective role. In addition, covering the step groove 10 can also have an anti-theft effect to prevent unauthorized personnel from twisting it at will after seeing the step groove 10.

[0028] In order to cater to the shape structure of standard parts and preset holes, so that the countersunk screw can fit tightly with the object after being immersed in the object, the upper end face 1a of the countersunk nut 1 is circular, the center of the stepped groove 10 is located at the center of the upper end face 1a of the countersunk nut 1, and the annular flange 31 of the shielding gasket 3 is in a circular ring shape.

[0029] Specifically, the countersunk nut 1 is a funnel-shaped structure with a gradually decreasing area in the direction toward the screw rod 2. When the countersunk screw is drilled into an object, the cross section of the countersunk nut 1 in contact with the preset hole gradually expands, reducing the resistance encountered when the hole is expanded to accommodate the countersunk nut 1, and facilitating countersinking.

[0030] In order to ensure that the shielding gasket 3 does not protrude from the countersunk nut 1 after covering the stepped groove 10, in the present embodiment, the upper surface of the shielding gasket 3 covering the stepped groove 10 is flush with the height of the outer peripheral edge of the countersunk nut 1, that is, the shielding gasket 3 is exactly flush with the outer structure of the annular mounting groove 11.

[0031] Exemplarily, the slot widths of the upper slot 103 and the lower slot 102 are equal, which is convenient for standardizing the blade width of the corresponding slotted screwdriver. Of course, as another embodiment of the stepped slot 10, the slot widths of the upper slot 103 and the lower slot 102 can be set to be unequal. When twisting the upper slot 103 and the lower slot 102, slotted screwdrivers of different specifications are required to twist them separately.

[0032] The annular flange 31 of the shielding gasket 3 should be embedded in the annular mounting groove 11 and stably fixed by interference fit. Therefore, the annular flange 31 of the shielding gasket 3 in this embodiment is an elastic rubber ring, which utilizes the elastic effect to make the annular flange 31 abut against the inner wall of the annular mounting groove 11 to ensure a more stable connection.

[0033] Furthermore, the surface of the countersunk nut 1 is provided with a galvanized layer, which, together with the above-mentioned shielding gasket 3, makes it more difficult for oxygen, water, etc. in the external environment to corrode the countersunk nut 1, thereby extending the service life of the countersunk screw. Exemplarily, the outer surface of the countersunk nut 1 is plated with a 5-8um blue zinc protective layer.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0035] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A countersunk screw, characterized in that: The countersunk screw comprises a countersunk nut (1) and a screw rod (2), wherein the countersunk nut (1) is connected to one end of the screw rod (2). A stepped groove (10) is provided at the center of the upper end surface (1a) of the countersunk nut (1) facing away from the screw rod (2). The stepped groove (10) comprises an upper hexagonal groove (101) and a lower slotted groove (102) from top to bottom. The lower slotted groove (102) is provided at the bottom of the upper hexagonal groove (101). In the radial direction of the countersunk nut (1), the groove walls of the upper hexagonal groove (101) on both sides opposite to each other are further provided with upper slotted grooves (103), forming two inwardly concave structures of the upper hexagonal groove (101) in the radial direction. The upper slotted groove (103) and the lower slotted groove (102) are respectively located in different radial directions of the countersunk nut (1). The countersunk nut (1) is formed with an annular mounting groove (11) along its outer peripheral edge, a shielding gasket (3) is provided above the stepped groove (10), the outer peripheral edge of the shielding gasket (3) extends downward to form an annular flange (31) protruding from the surface of the shielding gasket (3), and the shielding gasket (3) is embedded in the annular mounting groove (11) through its annular flange (31) for fixation.

2. The countersunk screw according to claim 1, characterized in that: The upper end surface (1a) of the countersunk nut (1) is circular, the center of the stepped groove (10) is located at the center of the circle of the upper end surface (1a) of the countersunk nut (1), and the annular flange (31) of the shielding gasket (3) is annular.

3. The countersunk screw according to claim 2, characterized in that: Along the direction toward the screw rod (2), the countersunk nut (1) is a funnel-shaped structure with a gradually decreasing area.

4. The countersunk screw according to claim 1, characterized in that: The upper surface of the shielding gasket (3) covering the stepped groove (10) is flush with the height of the outer peripheral edge of the countersunk nut (1).

5. The countersunk screw according to claim 1, characterized in that: The groove widths of the upper layer straight groove (103) and the lower layer straight groove (102) are equal.

6. The countersunk screw according to claim 1, characterized in that: The annular flange (31) of the shielding gasket (3) is an elastic rubber ring.

7. The countersunk screw according to claim 1, characterized in that: The surface of the countersunk nut (1) is provided with a zinc coating.

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