spring screw

Abstract

The utility model discloses a spring screw, it includes screw body and spring body, and the screw body includes screw head part and screw rod part, and the spring body is tower spring, is equipped with guide ring and assembly ring on the tower spring, is equipped with the card male and the slot on the screw rod part, and the assembly ring is assembled on the card slot, and the other end of screw rod part stretches out from the guide ring, the utility model discloses structure design is reasonable, and the spring body whole is tower shape or conical shape, and the lower part is big, and the upper part is small, and the whole structure stability is good, and it is difficult to skew, and moreover the most lower end of tower spring is twisted into the guide ring that is adapted with the outer diameter of screw rod part from outside to inside on the same horizontal bottom surface, that is, the guide ring clearance fit is sleeved on the screw rod part, and the spring position is effectively limited, avoids the shift, makes the spring and screw always coaxial, and when tightening, the guide ring can only axially slide along the screw rod part and can not move radially, effectively prevents the spring skew and shift, and ensures the assembly effect.

Description

Technical Field

[0001] This utility model relates to the field of screw technology, specifically to a spring screw. Background Technology

[0002] Screws, as a basic and widely used fastener, typically consist of a screw head and a shank, used to connect two or more components together. In certain specific applications, such as devices that vibrate continuously during operation, these screws are prone to loosening under the influence of resonance, eventually falling off or even becoming damaged.

[0003] To address this issue, existing technologies have developed spring screws that combine a spring with a screw. Spring screws are also known as non-removable screws, non-detachable screws, or non-detachable screws. For example, utility model publication CN217519046U, entitled "A Spring Screw," discloses a spring screw comprising: a head with a countersunk groove on its end face; the head and a fixing rod are fixedly connected; the fixing rod and a threaded rod are fixedly connected; a spring is fitted onto the fixing rod; a rotating disk is rotatably disposed inside the head; the lower surface of the rotating disk has retaining teeth; a spring hole is located at the bottom of the head; the head is hollow; the spring hole communicates with the interior of the head; and one end of the spring passes through the spring hole. While this design effectively prevents the screw from loosening due to equipment vibration, its structure is relatively complex, manufacturing is troublesome, and the cylindrical spring is prone to displacement and misalignment during installation, leading to misalignment between the spring and the screw and affecting assembly stability. Utility Model Content

[0004] To address the aforementioned shortcomings, the purpose of this utility model is to provide a spring screw with a reasonable structural design, easy assembly, and good stability.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A spring screw includes a screw body and a spring body. The spring body is a conical spring. The screw body includes a screw head and a screw shank. The lower part of the conical spring gradually increases in size. The lower end of the conical spring is wound from the outside to the inside on the same horizontal bottom surface to form a guide ring at the center position, which is adapted to the outer diameter of the screw shank. The upper part of the conical spring gradually decreases in size to form an assembly ring at the center position. The end of the screw shank near the screw head has a radially enlarging locking protrusion. A locking groove is formed between the locking protrusion and the screw head. The assembly ring is assembled in the locking groove. The other end of the screw shank extends out from the guide ring.

[0007] In a preferred embodiment of this invention, one end of the screw section and the screw head is provided with a radially enlarged step, and the slot and the step are located on the step. The structure is rationally designed and easy to manufacture.

[0008] In a preferred embodiment of this invention, the bottom surface of the slot is a smooth surface. The sliding friction of the mounting ring on a smooth surface is minimal, allowing for smoother rotation and assembly of the screw body.

[0009] In a preferred embodiment of this invention, the corner of the protrusion near the slot is a right angle, and the corner near the screw is a rounded surface. The right angle helps prevent the assembly ring from coming out, while the rounded surface facilitates the smooth insertion of the assembly ring into the slot.

[0010] In a preferred embodiment of this invention, the diameter of the bottom surface of the tower-shaped spring is twice the diameter of the top surface. This creates a stable truncated cone-shaped structure with a larger bottom and a smaller top, improving installation stability.

[0011] In a preferred embodiment of this invention, at least one-fifth of the length of the screw portion extends from the guide ring. In the free state, the front end of the screw portion still has sufficient length exposed, facilitating assembly.

[0012] As a preferred embodiment of this utility model, the screw head and the screw rod are integrally connected, resulting in a firm connection and high strength.

[0013] In a preferred embodiment of this invention, the screw head has a circular outline and a drive groove on its upper surface. The drive groove can be a slotted, Phillips, or hexagonal drive groove, and can be used with standard tools to screw it in.

[0014] The beneficial effects of this utility model are as follows: The structure of this utility model is reasonably designed. The spring body is generally tower-shaped or conical, with a larger lower part and a smaller upper part. The overall structure has good stability and is not easy to tilt. Moreover, the lowest end of the tower-shaped spring is wound from the outside to the inside on the same horizontal bottom surface to form a guide ring that matches the outer diameter of the screw. That is, the guide ring is fitted on the screw with a gap fit, which effectively limits the position of the spring and avoids displacement. This ensures that the spring and the screw are always coaxial. When tightening, the guide ring can only slide axially along the screw and cannot move radially, which effectively prevents the spring from tilting and shifting, and ensures the assembly effect.

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0017] Figure 2 This is a top view of the structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the spring body in this utility model. Detailed Implementation

[0019] See Figures 1 to 3 This embodiment provides a spring screw, which includes a screw body 1 and a spring body 2. The spring body 2 is a tower-shaped spring, and the screw body 1 includes a screw head 11 and a screw shank 12. The screw head 11 and the screw shank 12 are integrally connected, resulting in a strong and robust connection. Preferably, the screw head 11 has a circular outline and a drive groove 111 on its upper surface. The drive groove 111 is preferably a cross-shaped groove; in other embodiments, the drive groove 111 can also be a slotted or hexagonal drive groove, allowing it to be used with standard tools and tightened with general-purpose tools. It is fully compatible with existing assembly lines, does not increase the cost of special tools, and is easy to assemble.

[0020] The lower portion of the tower-shaped spring gradually increases in size. At the center position, the lower end of the spring is wound from the outside inwards on the same horizontal base surface to form a guide ring 21 that matches the outer diameter of the screw portion 12. The guide ring 21 can be fitted onto the screw portion with a clearance fit. Preferably, at least one-fifth of the length of the screw portion 12 extends out from the guide ring 21. In the free state, the front end of the screw portion still has sufficient length exposed, facilitating assembly. The screw portion restricts the guide ring 21 to slide only axially and not radially. The upper portion of the tower-shaped spring gradually decreases in size, forming an assembly ring 22 at the center position.

[0021] The diameter of the bottom surface of the tower-shaped spring is preferably twice the diameter of the top surface. This makes the spring have a stable truncated cone-shaped structure, with a larger bottom and a smaller top, and the overall shape is tower-shaped or cone-shaped, improving installation stability.

[0022] The screw portion has a radially enlarged retaining protrusion 121 near the screw head 11, forming a retaining groove 122 between the retaining protrusion 121 and the screw head 11. The mounting ring 22 is fitted onto the retaining groove 122. Preferably, the corner of the retaining protrusion 121 near the retaining groove 122 is a right angle, and the corner near the screw portion is a rounded surface. The right angle helps prevent the mounting ring 22 from falling out, while the rounded surface facilitates the smooth insertion of the mounting ring 22 into the retaining groove 122.

[0023] The mounting ring 22 is fitted onto the slot 122, and the other end of the screw portion 12 extends from the guide ring 21. The bottom surface of the slot 122 is preferably a smooth surface. The mounting ring 22 experiences less sliding friction on a smooth surface, allowing for smoother rotation and assembly of the screw body 1.

[0024] Preferably, a radially enlarged step is provided at one end of the screw section and the screw head, and the slot 122 and the step are located on the step. The structure is reasonably designed and easy to process.

[0025] During assembly, the assembly ring 22 is directly inserted into the slot, and the guide ring 21 is fitted onto the front end of the screw. When tightening, the guide ring 21 can only slide axially along the screw and cannot move radially, effectively preventing the spring from tilting and shifting. This allows each coil of the spring body 2 to contract layer by layer and be subjected to uniform force, resulting in a good assembly effect.

[0026] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. As described in the above embodiments of this utility model, other screws obtained using the same or similar structures are all within the protection scope of this utility model.

Claims

1. A spring screw, comprising a screw body and a spring body, characterized in that, The spring body is a tower-shaped spring, and the screw body includes a screw head and a screw rod. The lower part of the tower-shaped spring gradually increases in size. The lower end of the tower-shaped spring is wound from the outside to the inside on the same horizontal bottom surface to form a guide ring that matches the outer diameter of the screw rod. The upper part of the tower-shaped spring gradually decreases in size to form an assembly ring at the center. The end of the screw rod near the screw head has a radially enlarged locking protrusion. A locking groove is formed between the locking protrusion and the screw head. The assembly ring is assembled in the locking groove. The other end of the screw rod extends out from the guide ring.

2. The spring screw according to claim 1, characterized in that: The screw section and one end of the screw head are provided with a radially enlarged step, and the slot and the step are located on the step.

3. The spring screw according to claim 1, characterized in that: The bottom surface of the card slot is a smooth surface.

4. The spring screw according to claim 1, characterized in that: The corner of the card protrusion near the card slot is a right angle, and the corner near the screw part is a rounded surface.

5. The spring screw according to claim 1, characterized in that: The bottom diameter of the tower-shaped spring is twice the top diameter.

6. The spring screw according to claim 1, characterized in that: At least one-fifth of the length of the screw extends from the guide ring.

7. The spring screw according to any one of claims 1-6, characterized in that: The screw head and screw shaft are integrally connected.

8. The spring screw according to claim 7, characterized in that: The screw head has a circular outline and a drive groove on its upper surface.

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