American standard high-strength round head square bolt
Through the design of the assembled square neck and screw part, combined with the upper and lower screw teeth in opposite thread directions, the problem of difficult control of the production specifications of the US-coordinated round head square bolts in the prior art is solved, and the locking effect and assembly strength of the bolts are improved.
Patent Information
- Application Number
- CN202422193408.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The square neck section of the existing American gauge round head four-square bolt is formed too closely with the round head end, which makes it difficult to control specification accuracy in production and affect assembly stability and strength.
Design the assembled square neck and screw part, and set opposite upper and lower screw teeth in the thread direction to ensure that the square neck and nut part interlock after tightening, improving the locking effect and strength.
Through assembled design and opposite thread structure, precise specification control and efficient processing and production of the square neck and nut are achieved, enhancing the locking effect and assembly strength of the bolts.
Smart Images
Figure CN223062863U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of fasteners, and particularly relates to a round head square bolt with American standard and high strength. Background Art
[0002] For the bolt structure used in American standard, a round head square bolt can be adopted. A round head part with a smooth surface is arranged at the end of the screw rod section. A square neck section is arranged between the round head part and the screw rod section. The square neck section plays a role in locking, preventing torsion and rotation. Only the round head of the fastener is exposed outside, which greatly improves the aesthetics and meets the use requirements.
[0003] However, for the production of the existing round head square bolts, the distance between the square neck section and the round head end is too close and the two are integrally formed. Therefore, it is not conducive to the production and forming of the square neck section, and it is difficult to ensure the accuracy of the specification data, resulting in problems that the subsequent bolts cannot be stably assembled and the assembly strength is poor. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a round head square bolt with American standard and high strength. By designing a assembled square neck part and screw rod part, it is beneficial to control the precise control of the specifications of the square neck part and high-efficiency processing and production. Through the design of upper threads and lower threads with opposite thread directions, it is ensured that the torsion directions between the square neck part and the nut part are opposite. After tightening the nut part, the interlock between the square neck part and the nut part is ensured, thereby improving the locking effect and strength of the bolt.
[0005] To solve the above technical problems, the utility model is realized through the following technical solutions:
[0006] The utility model is a round head square bolt with American standard and high strength, including a screw rod part, a nut part and a square neck part. A round head body is arranged at the end of the screw rod part;
[0007] A convex rod part is arranged at one end of the screw rod part close to the round head body. The outer diameter of the convex rod part is larger than that of the screw rod part. Upper threads are arranged on the convex rod part. Lower threads are arranged at one end of the screw rod part away from the round head body. The thread directions of the upper threads and the lower threads are opposite. The nut part is threadedly connected with the lower threads;
[0008] The square neck part is a square sleeve body. Arc surfaces are arranged at the four corners on the outer side of the square neck part. Internal threads that are threadedly matched with the upper threads are arranged at the axis center of the square neck part. The end face of the square neck part is attached to the bottom surface of the round head body.
[0009] Furthermore, a plurality of embedding edges are arranged on the bottom surface of the round head body. The embedding edges on the inner side of the round head body are located at the positions outside the square neck part.
[0010] Furthermore, the embedding edges are of an annular structure. The outer diameters of the plurality of embedding edges increase in sequence from the inside to the outside.
[0011] Further, a rolling thread relief area is formed between the upper thread and the round head body, and the outer surface of the rolling thread relief area is smooth.
[0012] Further, the length of the square neck part is greater than that of the convex rod part, and the exceeding distance is in the range of 0.5 - 2 cm.
[0013] Further, a fillet slope is provided at the edge of the end of the screw rod part far from the round head body.
[0014] The utility model has the following beneficial effects:
[0015] By designing the assembled square neck part and screw rod part, the utility model facilitates the connection and assembly between the square neck part and the screw rod part. Meanwhile, it is beneficial to accurately control the specifications of the square neck part and achieve efficient processing and production, ensuring the use effect and assembly strength of the subsequent round head square bolt. At the same time, through the design of the upper thread and the lower thread with opposite thread directions, it is ensured that the torsional directions between the square neck part and the nut part are opposite. After tightening the nut part, the interlock between the square neck part and the nut part is ensured, improving the pre-tightening force between the two, thereby enhancing the locking effect and strength of the bolt.
[0016] Of course, when implementing any product of the utility model, it is not necessarily required to simultaneously achieve all the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0018] Figure 1 It is a schematic structural diagram of a round head square bolt with American standard and high strength of the utility model;
[0019] Figure 2 It is a schematic structural diagram of the screw rod part and the nut part;
[0020] Figure 3 It is a schematic structural diagram of the square neck part;
[0021] In the drawings, the list of components represented by each reference numeral is as follows:
[0022] 1 - screw rod part, 2 - nut part, 3 - square neck part, 101 - round head body, 102 - convex rod part, 103 - upper thread, 104 - lower thread, 105 - embedding edge, 106 - rolling thread relief area, 107 - fillet slope, 301 - arc surface, 302 - internal thread. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0024] Please refer to Figures 1 - 3 As shown, the present invention is a US-standard high-strength round-headed square bolt, including a screw rod portion 1, a nut portion 2, and a square neck portion 3. A round head body 101 is provided at the end of the screw rod portion 1;
[0025] A convex rod portion 102 is provided at one end of the screw rod portion 1 close to the round head body 101. The outer diameter of the convex rod portion 102 is greater than the outer diameter of the screw rod portion 1. Upper screw threads 103 are provided on the convex rod portion 102. Lower screw threads 104 are provided at the end of the screw rod portion 1 away from the round head body 101. The thread directions of the upper screw threads 103 and the lower screw threads 104 are opposite. The nut portion 2 is threadedly connected to the lower screw threads 104;
[0026] The square neck portion 3 is a square sleeve body. Arc surfaces 301 are provided at the four corners on the outer side of the square neck portion 3. An internal thread 302 that is threadedly engaged with the upper screw threads 103 is provided at the axis of the square neck portion 3. The end surface of the square neck portion 3 is in contact with the bottom surface of the round head body 101.
[0027] Furthermore, a plurality of embedding edges 105 are provided on the bottom surface of the round head body 101. The embedding edges 105 on the inner side of the round head body 101 are located at the position outside the square neck portion 3.
[0028] Furthermore, the embedding edges 105 are in an annular structure, and the outer diameters of the plurality of embedding edges 105 increase sequentially from the inside to the outside.
[0029] Furthermore, a rolling thread relief area 106 is formed between the upper screw threads 103 and the round head body 101, and the outer surface of the rolling thread relief area 106 is smooth.
[0030] Furthermore, the length of the square neck portion 3 is greater than the length of the convex rod portion 102, and the exceeding distance is in the range of 0.5 - 2 cm.
[0031] Among them, as Figures 1 - 2 shown, a fillet slope 107 is provided at the edge of the end of the screw rod portion 1 away from the round head body 101.
[0032] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.
[0033] The preferred embodiments of the present utility model disclosed above are only used to help explain the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.
Claims
1. A US-standard high-strength round-head square bolt, comprising a screw rod portion (1) and a nut portion (2), wherein a round head body (101) is provided at the end of the screw rod portion (1), and it is characterized in that: It further includes a square neck portion (3); One end of the screw rod portion (1) close to the round head body (101) is provided with a convex rod portion (102). The outer diameter of the convex rod portion (102) is larger than the outer diameter of the screw rod portion (1). An upper thread (103) is provided on the convex rod portion (102). One end of the screw rod portion (1) away from the round head body (101) is provided with a lower thread (104). The thread directions of the upper thread (103) and the lower thread (104) are opposite. The nut portion (2) is threadedly connected to the lower thread (104); The square neck portion (3) is a square sleeve body. Arc surfaces (301) are provided at four corners on the outer side of the square neck portion (3). An internal thread (302) that is threadedly matched with the upper thread (103) is provided at the axis center of the square neck portion (3). The end face of the square neck portion (3) is attached to the bottom surface of the round head body (101).
2. A US-standard high-strength round-head square bolt according to claim 1, characterized in that, A plurality of embedding edges (105) are provided on the bottom surface of the round head body (101). The embedding edges (105) on the inner side of the round head body (101) are located at the position outside the square neck portion (3).
3. A US-standard high-strength round-head square bolt according to claim 2, characterized in that, The embedding edges (105) are of an annular structure. The outer diameters of the plurality of embedding edges (105) increase in sequence from the inside to the outside.
4. A US-standard high-strength round-head square bolt according to claim 1, characterized in that, A rolling thread relief area (106) is formed between the upper thread (103) and the round head body (101). The outer surface of the rolling thread relief area (106) is smooth.
5. A US-standard high-strength round-head square bolt according to claim 1, characterized in that, The length of the square neck portion (3) is greater than the length of the convex rod portion (102), and the exceeding distance is in the range of 0.5 - 2 cm.
6. A US-standard high-strength round-head square bolt according to claim 1, characterized in that, A fillet slope (107) is provided at the edge of one end of the screw rod portion (1) away from the round head body (101).