Anti-loosening screw assembly

Abstract

The utility model discloses a captive screw assembly. A baffle and a nut cover are located on the outer side and the inner side of a case shell respectively. Fixing screw holes are formed in the two ends of the nut cover respectively, and a containing groove is formed in the middle of the nut cover. The square nut is placed in the containing groove, and a movable gap exists between the square nut and the containing groove so that the square nut can rotate in the containing groove. A second through hole corresponding to the thread part is formed in the middle of the case shell, and first through holes corresponding to the fixing screw holes are formed in the two ends of the case shell respectively; when the captive screw assembly is installed on the case shell, the fixing screw is screwed into the first through hole and the fixing screw hole from the outer side of the case shell so that the nut cover can be fixedly connected with the case shell, and the threaded part of the captive screw penetrates through the second through hole and is connected with the square nut. The locking screw has the advantages of being compact in structure, convenient to disassemble and assemble, high in adjusting flexibility and the like, and the defect that the locking screw cannot be screwed in or feels unsmooth after the center position deviates is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of threaded connection structures, in particular to a captive screw assembly suitable for a chassis shell. Background Art

[0002] Existing chassis products have little consideration for the smooth feel of retaining screw retaining plates. To ensure smooth tightening and loosening, the only way to ensure this is to infinitely increase component machining precision to ensure accurate positioning. However, this approach significantly increases product costs.

[0003] Existing chassis and enclosure products, in addition to improving component machining precision, also take the other extreme approach: infinitely widening the clearances between parts. When the clearances are wide enough, even if the positioning of a captive screw and its screw hole isn't precise enough, there's ample room for it to maneuver and screw in smoothly. However, this can cause the baffle to shift to one side, creating uneven clearances around the edges, severely impacting the product's appearance.

[0004] Furthermore, existing chassis shells simply don't have space for the baffle to sink, allowing it to be attached directly to the chassis shell, eliminating the uneven gap. However, this structure still has unacceptable cosmetic issues, prone to unevenness, and the baffle is not flush with the chassis shell. When multiple baffles are included, they interfere with each other, making assembly impossible. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a non-loose screw assembly with compact structure, high stability and convenient assembly and disassembly in view of the deficiencies in the prior art.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A captive screw assembly comprises: a captive screw, a baffle, a nut cover, a square nut and a fixing screw; the captive screw comprises a screwing portion and a threaded portion, the threaded portion passes through the baffle, and the baffle and nut cover are respectively located on the outer side and the inner side of the chassis shell; fixing screw holes are respectively provided at both ends of the nut cover, and a receiving groove is provided in the middle of the nut cover; the square nut is placed in the receiving groove, and there is a movable gap between the square nut and the receiving groove to enable the square nut to rotate in the receiving groove; a second through hole corresponding to the threaded portion is provided in the middle of the chassis shell, and first through holes corresponding to the fixing screw holes are respectively provided at both ends of the chassis shell; when the captive screw assembly is installed on the chassis shell, the fixing screw is screwed into the first through hole and the fixing screw hole from the outside of the chassis shell to achieve the connection and fixation of the nut cover to the chassis shell, and the threaded portion of the captive screw passes through the second through hole of the chassis shell and is connected with the square nut.

[0008] As a further improvement of the utility model, the aperture of the second through hole is larger than the thread aperture of the square nut but smaller than the side length of the square nut.

[0009] As a further improvement of the utility model, the first through hole is a tapered hole.

[0010] As a further improvement of the utility model, the accommodating groove is a square structure.

[0011] As a further improvement of the utility model, the nut cover is a sheet metal part of stainless steel material or galvanized material.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] The non-loose screw assembly of the utility model is characterized in that fixed screw holes are arranged at both ends of the nut cover, the fixed screw is screwed into the first through hole and the fixed screw hole outside the case shell, the connection and fixation of the nut cover and the case shell are realized, the position precision is high, and the non-loose screw is screwed in and loosened very smoothly, and the defect that the non-loose screw cannot be screwed in or feels not smooth after the center position is offset is eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a whole structure principle schematic view of the non-loose screw assembly in the embodiment of the utility model;

[0015] Figure 2 It is a whole structure principle schematic view of the nut cover in the embodiment of the utility model;

[0016] Figure 3 It is a front view structure principle schematic view of the nut cover in the embodiment of the utility model;

[0017] Figure 4 It is a structure principle schematic view of the square nut rotating in the counterclockwise direction in the embodiment of the utility model;

[0018] Figure 5 It is a structure principle schematic view of the square nut rotating in the clockwise direction in the embodiment of the utility model;

[0019] Legend: 1. Captive screw; 11. Screw-on portion; 12. Threaded portion; 2. Baffle; 3. Nut cover; 31. Fixing screw hole; 32. Receiving slot; 4. Square nut; 5. Fixing screw; 100. Chassis shell; 101. First through hole; 102. Second through hole. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0021] In the description of the present invention, it should be understood that the terms "side", "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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting 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 one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0023] Example

[0024] like Figure 1 、 Figure 2 and Figure 3As shown, the captive screw assembly of the present invention includes: a captive screw 1, a baffle 2, a nut cover 3, a square nut 4 and a fixing screw 5. The baffle 2 and the nut cover 3 are respectively located on the outside and inside of the chassis shell 100. The captive screw 1 includes a screwing portion 11 and a threaded portion 12. The threaded portion 12 passes through the baffle 2. The screwing portion 11 is located on the outside of the baffle 2. By twisting the screwing portion 11, the captive screw 1 can be compressed or stretched. Fixed screw holes 31 are respectively provided at both ends of the nut cover 3, and a receiving groove 32 is provided in the middle of the nut cover 3. The square nut 4 is placed in the receiving groove 32, and there is a movable gap between the square nut 4 and the receiving groove 32 to enable the square nut 4 to rotate in the receiving groove 32. A second through hole 102 corresponding to the threaded portion 12 is provided in the middle of the chassis shell 100, and a first through hole 101 corresponding to the fixed screw hole 31 is respectively provided at both ends of the chassis shell 100. When the captive screw assembly is installed on the chassis shell 100, the fixing screw 5 is screwed into the first through hole 101 and the fixing screw hole 31 from the outside of the chassis shell 100 to connect and fix the nut cover 3 to the chassis shell 100. The threaded portion 12 of the captive screw 1 passes through the second through hole 102 of the chassis shell 100 and is connected to the square nut 4.

[0025] In the present embodiment, by respectively providing fixing screw holes 31 at both ends of the nut cover 3, the fixing screw 5 is screwed into the first through hole 101 and the fixing screw hole 31 outside the chassis housing 100, thereby achieving a connection and fixation between the nut cover 3 and the chassis housing 101, which is simple, convenient and has high positional accuracy. At the same time, a receiving groove 32 is provided in the middle of the nut cover 3, and the square nut 4 is placed in the receiving groove 32. The square nut 4 does not have the possibility of falling or rotating arbitrarily, which is both stable and easy to implement. Moreover, since there is a movable gap between the square nut 4 and the receiving groove 32, the square nut 4 has room for movement in four directions, up, down, left and right, in the receiving groove 32. Even if the center of the captive screw 1 cannot be aligned with the center of the screw hole of the square nut 4, the square nut 4 can adapt to the error of the center offset through the movable gap, thereby achieving a very smooth screwing and loosening of the captive screw 1, eliminating the defect that the captive screw 1 cannot be screwed in or feels uncomfortable after the center position is offset.

[0026] like Figure 2 As shown, the first through hole 101 is a tapered hole with the bottom of the cone facing the fixing screw hole 31, so that the fixing screw 5 can be easily removed from the outside of the chassis housing 100, thereby improving the convenience of removing and installing the nut sleeve 3. Moreover, the fixing screw 5 can be locked by simply passing through the first through hole 101 and the fixing screw hole 31, with high positioning accuracy.

[0027] like Figure 2As shown, the aperture of the second through hole 102 is larger than the threaded aperture of the square nut 4 but smaller than the side length of the square nut 4, which not only ensures that the square nut 4 will not fall out, but also reserves a certain adjustable space for the square nut 4 to eliminate the position deviation between the captive screw 1 and the square nut 4, thereby improving the adaptability of the installation of the captive screw 1.

[0028] like Figure 3 As shown, the receiving groove 32 is a square structure. Figure 4 and Figure 5 As shown, the square nut 4 can be rotated in the receiving groove 32 with a certain displacement in the clockwise direction or in the counterclockwise direction, which can eliminate the position deviation between the captive screw 1 and the square nut 4 to the greatest extent.

[0029] In this embodiment, the nut cover 3 is a sheet metal component made of stainless steel or galvanized material, characterized by a simple structure and high support strength. Specifically, the nut cover 3 is processed into a "C" shape, which has relatively low manufacturing costs and occupies a small space inside the chassis housing 100. It can be installed using tools on the outside of the chassis housing 100, which reduces assembly difficulty and production costs.

[0030] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A captive screw assembly, characterized in that: include: A captive screw (1), a baffle (2), a nut cover (3), a square nut (4) and a fixing screw (5); the captive screw (1) comprises a screwing portion (11) and a threaded portion (12), the threaded portion (12) passes through the baffle (2), the baffle (2) and the nut cover (3) are respectively located on the outside and inside of the chassis shell (100); both ends of the nut cover (3) are respectively provided with fixing screw holes (31), and the middle part of the nut cover (3) is provided with a receiving groove (32); the square nut (4) is placed in the receiving groove (32), and there is a movable gap between the square nut (4) and the receiving groove (32) to achieve the square nut (4) in the receiving groove (32) ); a second through hole (102) corresponding to the threaded portion (12) is provided in the middle of the chassis shell (100), and first through holes (101) corresponding to the fixing screw holes (31) are provided at both ends of the chassis shell (100); when the captive screw assembly is mounted on the chassis shell (100), the fixing screw (5) is screwed into the first through hole (101) and the fixing screw hole (31) from the outside of the chassis shell (100) to achieve connection and fixation of the nut cover (3) with the chassis shell (100), and the threaded portion (12) of the captive screw (1) passes through the second through hole (102) of the chassis shell (100) and is connected to the square nut (4).

2. The captive screw assembly according to claim 1, characterized in that: The aperture of the second through hole (102) is larger than the threaded aperture of the square nut (4), but smaller than the side length of the square nut (4).

3. The captive screw assembly according to claim 2, characterized in that: The first through hole (101) is a tapered hole.

4. The captive screw assembly according to claim 3, characterized in that: The accommodating groove (32) is a square structure.

5. The captive screw assembly according to any one of claims 1 to 4, characterized in that: The nut cover (3) is a sheet metal part made of stainless steel or galvanized material.

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