Spring structure type cross-shaped large flat head machine screw

Abstract

The utility model discloses a spring structure type cross-shaped large flat head machine screw which comprises a screw body, the screw body comprises a threaded section and a screw rod section, the top of the screw rod section is fixedly connected with a large flat head, the bottom of the large flat head is fixedly connected with a rubber sleeve, the rubber sleeve is arranged on the outer surface of the screw rod section in a sleeving mode, and the screw rod section is fixedly connected with the screw rod section. The bottom of the large flat head is fixedly connected with a spring gasket, the top of the spring gasket is fixedly connected with a limiting baffle ring, and the outer surface of the large flat head is sleeved with the limiting baffle ring; a plurality of limiting teeth are evenly and fixedly connected to the outer surface of the large flat head. According to the utility model, through the combination of the compression stroke of the spring gasket and the visual indication loop line, the problems of dependence on tool precision, influence of human factors and incompatibility of the broken tail groove and the large flat head structure in the background technology are effectively overcome, the consistency of pre-tightening force is ensured through visual color change, an anti-loosening function is integrated, the assembly quality and efficiency are remarkably improved, and the production cost is reduced. And meanwhile, the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of screw technology, and in particular to a spring-structured Phillips head flathead machine screw. Background Technology

[0002] Phillips head machine screws, due to their flat head, large bearing area, and versatile slot design, are widely used in sheet metal connections, equipment panels, and electrical assembly. Their design advantage lies in providing good clamping force while preventing the head from excessively sinking into thin sheet materials. However, ensuring that these screws receive appropriate and consistent preload during actual assembly remains a long-standing challenge.

[0003] Currently, preload control mainly relies on torque wrenches or electric screwdrivers. This method not only requires regular tool calibration but also heavily depends on the operator's conscientiousness. In mass production, it is difficult to completely avoid missed tightening or insufficient torque, making it difficult to guarantee quality stability. Higher precision torque-angle laws require complex sensors and electronic control systems, which are too costly and completely unsuitable for the screw's conventional applications.

[0004] Furthermore, although there are torque screws with broken-tail grooves in the industry, their technical solution is fundamentally contradictory to the structural characteristics of Phillips head flathead screws. The broken-tail design leaves a raised and rough fracture end after tightening, which not only destroys the inherent flatness advantage of the flathead screw, but also may cause interference or scratches. At the same time, its non-reusable nature increases the cost of use.

[0005] Therefore, for Phillips head machine screws, a widely used and common fastener, existing technology lacks an economical solution that can maintain their advantages of low cost and simple structure while providing intuitive and reliable preload indication. This gap has resulted in the assembly quality of this type of screw being constrained by human factors for a long time, failing to meet the urgent needs of modern, efficient, and standardized manufacturing for consistent quality and traceability. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the existing technology and propose a spring-structured cross-head flat head machine screw.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a spring-structured cross-head flat head machine screw, comprising a screw body, the screw body comprising a threaded section and a screw rod section, wherein a large flat head is fixedly connected to the top of the screw rod section, a rubber sleeve is fixedly connected to the bottom of the large flat head, and the rubber sleeve is fitted on the outer surface of the screw rod section, a spring washer is fixedly connected to the bottom of the large flat head, and a limit retaining ring is fixedly connected to the top of the spring washer, and the limit retaining ring is fitted on the outer surface of the large flat head;

[0008] The outer surface of the large flat head is uniformly and fixedly connected with several limiting teeth, and the limiting teeth match the limiting retaining ring.

[0009] The outer surface of the large flat head is coated with a set of indicator rings.

[0010] Furthermore, the top of the large flat head has a cross groove, which ensures perfect compatibility with standard Phillips screwdrivers.

[0011] Furthermore, the spring washer includes a spring body, which is fixedly installed at the bottom of the large flat head. A metal washer is fixedly connected to the bottom of the spring body, and the metal washer is sleeved on the outer surface of the screw section. This design directly converts the elastic force of the spring into a continuous clamping force on the workpiece, effectively overcoming the preload attenuation caused by vibration and providing a stable anti-loosening effect.

[0012] Furthermore, the bottom of the metal pad is provided with anti-slip texture, which increases the friction between the pad and the workpiece surface.

[0013] Furthermore, the limiting ring includes several blocking teeth, and the blocking teeth are fixedly installed on the top of the metal gasket. The limiting teeth are located between two adjacent blocking teeth. The top of the several blocking teeth is fixedly connected to a movable ring, and the movable ring is slidably sleeved on the outer surface of the large flat head. The meshing structure of the blocking teeth and the limiting teeth converts the rotational motion into axial displacement.

[0014] Furthermore, the metal gasket, retaining tooth, and movable ring are designed as a single unit, and the one-piece molding process avoids the risk of loosening caused by assembling multiple parts, thereby enhancing the strength and durability of the overall structure.

[0015] Furthermore, the set of warning rings includes blue, yellow, and red rings from bottom to top. The multi-colored rings form a progressive visual warning of "pre-tightening - approaching - in place", which is as intuitive as a traffic light.

[0016] The beneficial effects of this utility model are:

[0017] In use, this utility model effectively overcomes the problems of reliance on tool precision, human factors, and incompatibility between the tail-cutting groove and the large flat head structure in the prior art by combining the compression stroke of the spring washer with the visual indicator ring. The intuitive color change ensures consistent preload and integrates anti-loosening function, which significantly improves assembly quality and efficiency while reducing costs. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0020] Figure 2 This is a partial three-dimensional structural schematic diagram of the present invention;

[0021] Figure 3 This is a partial cross-sectional view of the present invention.

[0022] The attached figures are labeled as follows:

[0023] 1. Threaded section; 2. Screw section; 3. Large flat head; 4. Red ring; 5. Stop tooth; 6. Yellow ring; 7. Cross groove; 8. Moving ring; 9. Metal washer; 10. Blue ring; 11. Limit tooth; 13. Rubber sleeve; 14. Spring body. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figures 1-3 As shown, a spring-structured Phillips head machine screw is disclosed, comprising a screw body, a threaded section 1 and a screw rod section 2, wherein a large flat head 3 is fixedly connected to the top of the screw rod section 2, and a Phillips head groove 7 is provided on the top of the large flat head 3.

[0026] A rubber sleeve 13 is fixedly connected to the bottom of the large flat head 3, and the rubber sleeve 13 is fitted on the outer surface of the screw section 2. A spring washer is fixedly connected to the bottom of the large flat head 3. A limit ring is fixedly connected to the top of the spring washer, and the limit ring is fitted on the outer surface of the large flat head 3. The spring washer includes a spring body 14, and the spring body 14 is fixedly installed at the bottom of the large flat head 3. A metal washer 9 is fixedly connected to the bottom of the spring body 14, and the metal washer 9 is fitted on the outer surface of the screw section 2. The bottom of the metal washer 9 is provided with anti-slip texture.

[0027] The outer surface of the large flat head 3 is uniformly and fixedly connected with several limiting teeth 11, and the limiting teeth 11 are matched with the limiting retaining ring. The limiting retaining ring includes several retaining teeth 5, and the retaining teeth 5 are fixedly installed on the top of the metal pad 9. The limiting teeth 11 are located between two adjacent retaining teeth 5. The top of several retaining teeth 5 is fixedly connected to a movable ring 8, and the movable ring 8 is slidably sleeved on the outer surface of the large flat head 3. The metal pad 9, retaining teeth 5 and movable ring 8 are designed as an integral unit.

[0028] The outer surface of the large flat head 3 is coated with a set of indicator rings, which, from bottom to top, include a blue ring 10, a yellow ring 6, and a red ring 4.

[0029] Working principle: During assembly, when a screwdriver is used to tighten the screw, the torque is transmitted to the large flat head 3 through the cross groove 7, which in turn drives the entire screw body to rotate, causing the threaded section 1 to be screwed into the threaded hole of the workpiece. As the screw is screwed in, the metal washer 9 first contacts and is pressed against the surface of the workpiece.

[0030] As torque continues to be applied, the metal washer 9 and the connected movable ring 8 and stop tooth 5 assembly are subjected to reverse pressure from the workpiece surface, preventing them from continuing to rotate downwards. Meanwhile, the large flat head 3 continues to rotate downwards under the torque, and the limiting teeth 11 on its outer surface move relative to the stop tooth 5, overcoming the elastic force of the spring body 14 and forcing the large flat head 3 to produce a downward axial displacement relative to the movable ring 8. This process causes the preload to continuously increase, while simultaneously compressing the spring body 14.

[0031] As the large flat head 3 moves downwards, the blue ring 10, yellow ring 6, and red ring 4 coated on its outer surface will sequentially emerge from below the movable ring 8. The emergence of the blue ring 10 indicates that the screw has begun to pre-tighten; the emergence of the yellow ring 6 indicates that the pre-tightening force is approaching the rated value, and the tightening speed should be slowed down; when the uppermost red ring 4 is fully exposed, it indicates that the pre-tightening force has reached the design standard value, and tightening should be stopped immediately. This intuitive color change provides the operator with a clear visual indication, ensuring precise control of the pre-tightening force.

[0032] Once the preload is reached, the spring body 14 is in a compressed state. Its continuous elastic force acts on the workpiece surface through the metal washer 9, providing stable anti-loosening resistance and effectively resisting the attenuation of preload caused by vibration and other reasons. At the same time, the limiting tooth 11 and the stop tooth 5 mesh with each other to form a mechanical self-locking mechanism, further preventing the screw from loosening.

[0033] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A spring-loaded Phillips head flathead machine screw, comprising a screw body, characterized in that: The screw body includes a threaded section (1) and a screw section (2), and a large flat head (3) is fixedly connected to the top of the screw section (2). A rubber sleeve (13) is fixedly connected to the bottom of the large flat head (3), and the rubber sleeve (13) is fitted on the outer surface of the screw section (2). A spring washer is fixedly connected to the bottom of the large flat head (3), and a limit ring is fixedly connected to the top of the spring washer, and the limit ring is fitted on the outer surface of the large flat head (3). The outer surface of the large flat head (3) is uniformly fixedly connected with several limiting teeth (11), and the limiting teeth (11) match the limiting retaining ring; The outer surface of the large flat head (3) is coated with a set of indicator rings.

2. The spring-loaded Phillips head machine screw according to claim 1, characterized in that: The top of the large flat head (3) is provided with a cross groove (7).

3. The spring-loaded Phillips head machine screw according to claim 1, characterized in that: The spring washer includes a spring body (14), and the spring body (14) is fixedly installed at the bottom of the large flat head (3). A metal washer (9) is fixedly connected to the bottom of the spring body (14), and the metal washer (9) is sleeved on the outer surface of the screw section (2).

4. The spring-loaded Phillips head machine screw according to claim 3, characterized in that: The bottom of the metal pad (9) is provided with anti-slip texture.

5. A spring-loaded Phillips head machine screw according to claim 4, characterized in that: The limiting ring includes several blocking teeth (5), and the blocking teeth (5) are fixedly installed on the top of the metal gasket (9), and the limiting tooth (11) is located between two adjacent blocking teeth (5). The top of several blocking teeth (5) is fixedly connected to a movable ring (8), and the movable ring (8) is slidably sleeved on the outer surface of the large flat head (3).

6. A spring-loaded Phillips head flathead machine screw according to claim 5, characterized in that: The metal gasket (9), the retaining tooth (5), and the movable ring (8) are designed as a single unit.

7. A spring-loaded Phillips head machine screw according to claim 1, characterized in that: The set of prompting rings, from bottom to top, includes a blue ring (10), a yellow ring (6), and a red ring (4).

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