High-strength tension spring mechanism containing hardware sheet

Abstract

The utility model discloses a high-strength tension spring mechanism containing a hardware sheet, which comprises a spring body, a first spring and a second spring, the two pulling pieces are connected to the two ends of the spring body respectively; a first clearance position used for containing the end of the spring body and a limiting frame located on the rear side of the first clearance position are formed on the pull piece, a first limiting part is formed in the first clearance position in a protruding mode and is close to the limiting frame, and the limiting frame is pressed between two adjacent spring wires at the end of the spring body, so that a connecting section is formed at the end of the spring body. The first limiting part is arranged in the first through hole of the connecting section in a penetrating manner so as to limit the connecting section in the first clearance position and form rotatable connection with the pull piece; and a first connecting hole is also formed in the pull piece. According to the tension spring mechanism, a hook in the prior art is replaced with the pull piece made of the hardware material, the stability of the tension spring mechanism can be effectively improved, and the tension spring mechanism can be suitable for various tension spring mechanisms.

Description

Technical field:

[0001] The utility model relates to the technical field of springs, in particular to a high-strength tension spring mechanism containing hardware sheets. Background technology:

[0002] A spring is a mechanical part that uses elasticity to work. It is generally made of spring steel and is used to control the movement of machinery, relieve shock or vibration, store energy, measure the size of force, etc. It is widely used in machines and instruments. Among them, the extension spring is also called the tension spring. It is a helical spring that bears axial tension. When it is not under load, the coils of the extension spring are generally tight and there is no gap between them.

[0003] In the past, extension springs were generally formed by one-piece spiral stacking, and they were connected to external objects through hooks provided at both ends of the spring body. This method has two problems: a. Since it is formed in one piece, the spring body cannot be replaced, so the extension spring needs to be designed and manufactured in different sizes according to usage requirements. However, if the spring body is damaged, the entire extension spring can only be replaced; b. Due to bending and torsion, a high stress area will be formed between the spring body and the hooks at both ends, which makes the extension spring prone to fatigue fracture, affecting its service life.

[0004] Later, someone proposed an improved tension spring, by changing the hooks at both ends of the spring body into two connecting pieces, so as to realize the disassembly and replacement of the spring body, so as to achieve the purpose of reducing costs, such as: the utility model patent application with patent announcement number CN205350167U discloses an expandable tension spring, which includes: two tension spring end parts, and a tension spring middle part is connected between the two tension spring end parts; the tension spring end parts include a tension spring end spiral, a hook welded to one end of the tension spring end spiral, and an end connecting piece welded to the other end of the tension spring end spiral; the tension spring middle part includes a tension spring middle spiral, a first connecting piece welded to one end of the tension spring middle spiral, and a second connecting piece welded to the other end of the tension spring middle spiral; the end connecting piece is connected to any one of the first connecting piece or the second connecting piece to fix the tension spring end part and the tension spring middle part.

[0005] However, this existing expandable extension spring also has the following disadvantages:

[0006] In this technical solution, since the middle part of the tension spring and the end parts of the tension spring at both ends, as well as the end parts of the tension spring and the welded hooks are all welded, this connection method results in a limited connection angle when the hook is connected to an external object, poor flexibility, and easy formation of high stress areas due to bending and torsion, resulting in fatigue fracture after long-term use, affecting the service life.

[0007] In view of this, the inventor proposes the following technical solution. Utility model content:

[0008] The utility model aims to overcome the deficiencies of the prior art and provide a high-strength tension spring mechanism containing a hardware sheet.

[0009] In order to solve the above technical problems, the utility model adopts the following technical solutions: a high-strength tension spring mechanism containing hardware sheets, comprising: a spring body, which is formed by bending and winding a spring wire for multiple turns and is columnar, and a first through hole is also formed in the spring body; two pull tabs, which are respectively connected to the two ends of the spring body; a first avoidance position for accommodating the end of the spring body and a limit frame located at the rear side of the first avoidance position are formed on the pull tab, and a first limiting portion protruding from the first avoidance position is used to be positioned with the first through hole of the spring body, the first limiting portion is close to the limiting frame, and the limiting frame is rotatably pressed between two adjacent coils of spring wire at the end of the spring body, so that a connecting section is formed at the end of the spring body, and the first limiting portion is penetrated through the first through hole of the connecting section to confine the connecting section in the first avoidance position and form a rotatable connection with the pull tab; a first connecting hole for connecting an external object is also provided at the end of the pull tab away from the first avoidance position.

[0010] Furthermore, in the above technical solution, a second limiting portion protruding outward and capable of extending into the first through hole to limit the connecting section is formed at the rear end of the limiting frame, and the second limiting portion is penetrated through the first through hole.

[0011] Furthermore, in the above technical solution, the width of the second limiting portion is consistent with that of the first limiting portion.

[0012] Furthermore, in the above technical solution, the first avoidance position includes a horizontal hole distributed laterally at the front end of the pull tab and used for the spring body to pass through, a first vertical hole vertically opened from one end of the horizontal hole toward the first connecting hole and used to accommodate the spring body, and a second vertical hole vertically opened from the other end of the horizontal hole toward the first connecting hole and used to accommodate the spring body, that is, the first avoidance position is in a concave shape or an inverted concave shape.

[0013] Furthermore, in the above technical solution, a first arc groove is formed on the inner wall of the first connecting hole toward an end away from the first avoiding position, and the size of the first arc groove is smaller than the size of the first through hole.

[0014] Furthermore, in the above technical solution, the spring body includes a connecting section connected to the first avoidance position and a main body section integrally formed with the connecting section and freely stretchable, wherein the connecting section is spirally wrapped around the first limiting portion through a transverse hole, and the spring wire of the connecting section is accommodated in the first vertical hole and the second vertical hole.

[0015] Furthermore, in the above technical solution, the width of the pull tab gradually decreases from the first avoidance position toward the first connecting hole, and one end of the pull tab close to the first connecting hole is in an arc shape.

[0016] Furthermore, in the above technical solution, the pull tab is formed with a first clamping portion and a second clamping portion for clamping into the gap formed by the spring wire of the spring body.

[0017] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art: a pull tab made of hardware material is used to replace the hook in the prior art, and the assembly can be completed by pressing the first limit part into the first through hole at the connecting section, and the limit frame is inserted between two adjacent coils of spring wire at the edge of the connecting section, which can effectively improve the stability of the tension spring mechanism and is suitable for various tension spring mechanisms. In addition, compared with the existing structure, the utility model does not require welding, does not affect the flexibility of the spring, can effectively avoid the formation of high stress areas, and almost no fatigue fracture will occur after long-term high-intensity use, which greatly improves the life of the tension spring mechanism and saves costs. In addition, in the utility model, the pull tab and the spring body are rotatably connected. When the pull tab is twisted, the limit frame will also slide between two adjacent coils of spring wire at the edge of the connecting section, thereby changing the orientation of the first connecting hole on the pull tab, so that the first connecting hole can be connected to external objects at any angle, which greatly enhances the applicability and avoids the welding connection method. It will not affect the flexibility of the spring body, so that the spring body can be freely twisted when in use, and will not bring pressure to the spring wire at the connecting section, thereby effectively avoiding the formation of high stress areas. Description of the drawings:

[0018] Figure 1 It is an exploded schematic diagram of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the utility model;

[0020] Figure 3 It is a cross-sectional view of the utility model. Specific implementation method:

[0021] The utility model is further described below in conjunction with specific embodiments and drawings.

[0022] See Figures 1 to 3As shown, a high-strength tension spring mechanism containing a metal sheet is provided, which comprises: a spring body 1, which is formed by bending a spring wire and winding multiple turns and is cylindrical, and a first through hole 10 is formed in the spring body 1; two pull tabs 2, which are respectively connected to the two ends of the spring body 1; a first avoidance position 20 for accommodating the end of the spring body 1 and a limiting frame 9 located at the rear side of the first avoidance position 20 are formed on the pull tab 2, and a protruding portion for penetrating with the first through hole 10 of the spring body 1 is formed in the first avoidance position 20. The first limiting portion 3 is set in position, and the first limiting portion 3 is close to the limiting frame 9. The limiting frame 9 is rotatably pressed between two adjacent coils of the spring wire at the end of the spring body 1, so that the end of the spring body 1 forms a connecting section 110, and the first limiting portion 3 is passed through the first through hole 10 of the connecting section 110 to limit the connecting section 110 in the first avoidance position 20 and form a rotatable connection with the pull tab 2; the pull tab 2 is also provided with a first connecting hole 11 at the end away from the first avoidance position 20 for connecting an external object.

[0023] In the present invention, a pull tab 2 made of hardware material is used to replace the hook in the prior art. The first limit portion 3 is pressed into the first through hole 10 at the connecting section 110, and the limit frame 9 is inserted between two adjacent coils of spring wire at the edge of the connecting section 110 to complete the assembly, which can effectively improve the stability of the tension spring mechanism and is suitable for various tension spring mechanisms. In addition, compared with the existing structure, the present invention does not require welding, does not affect the flexibility of the spring, can effectively avoid the formation of high stress areas, and almost no fatigue fracture occurs after long-term high-intensity use, which greatly improves the life of the tension spring mechanism and saves costs.

[0024] In actual use, the tension spring often needs to be bent or twisted due to the different angles or directions between the two external objects to be connected, which can easily generate high stress areas. In order to avoid the formation of high stress areas, the utility model presses the first limiting portion 3 into the first through hole 10 at the connecting section 110, and inserts the limiting frame 9 between the two adjacent coils of spring wire at the edge of the connecting section 110. The pull tab 2 and the spring body 1 are rotatably connected. Therefore, when the pull tab 2 is twisted, the limiting frame 9 will also slide between the two adjacent coils of spring wire at the edge of the connecting section 110, thereby changing the direction of the first connecting hole 11 on the pull tab 2, so that the first connecting hole 11 can be connected to an external object at any angle, which greatly enhances the applicability, avoids the welding connection method, and effectively enhances the flexibility of the spring body 1, so that the spring body 1 can be freely twisted when in use, and will not bring pressure to the spring wire at the connecting section 110, thereby effectively avoiding the formation of high stress areas.

[0025] Since the utility model needs to ensure the stability of the connection, the first limiting portion 3 and the second limiting portion 4 are provided on the pull tab 2 to limit the spring body 1 to enhance the stability. Specifically, the first avoiding position 20 is formed with a first limiting portion 3 for the spring body 1 to spirally surround the spring body 1 to limit the spring body 1; the rear end of the limiting frame 9 is also formed with a second limiting portion 4 that protrudes outward and can extend into the first through hole 10 to limit the connecting section 110, and the second limiting portion 4 is penetrated through the first through hole 10. The width of the second limiting portion 4 is consistent with that of the first limiting portion 3. Among them, when the two pull tabs 2 are connected to the spring body 1, the first limiting portion 3 and the second limiting portion 4 will both extend into the first through hole 10 of the spring body 1. When the spring body 1 is deformed by external force, the first limiting portion 3 and the second limiting portion 4 can contact and press with the spring wire of the spring body 1, and prevent the spring body 1 from accidentally sliding in the first avoiding position 20, thereby effectively improving the stability.

[0026] The first avoidance position 20 includes a horizontal hole 203 distributed laterally at the front end of the pull tab 2 and used for the spring body 1 to pass through, a first vertical hole 201 vertically opened from one end of the horizontal hole 203 to the direction of the first connecting hole 11 and used to accommodate the spring body 1, and a second vertical hole 202 vertically opened from the other end of the horizontal hole 203 to the direction of the first connecting hole 11 and used to accommodate the spring body 1, that is, the first avoidance position 20 is in a concave shape or an inverted concave shape.

[0027] The inner wall of the first connection hole 11 is further provided with a first arc groove 101 away from the first avoidance position 20 . The size of the first arc groove 101 is smaller than that of the first through hole 10 , so that the pull tab 2 can be connected to the external object more stably.

[0028] The spring body 1 includes a connecting section 110 connected to the first avoidance position 20 and a body section 120 which is integrally formed with the connecting section 110 and can be stretched freely, wherein the connecting section 110 is spirally wrapped around the first limiting portion 3 through the transverse hole 203, and the spring wire of the connecting section 110 is accommodated in the first vertical hole 201 and the second vertical hole 202.

[0029] The width of the pull tab 2 gradually decreases from the first avoidance position 20 toward the first connection hole 11, and the end of the pull tab 2 close to the first connection hole 11 is arc-shaped. The smaller width at the first connection hole 11 can make it more convenient to connect the pull tab 2 to an external object.

[0030] In summary, in the present invention, a pull tab 2 made of hardware material is used to replace the hook in the prior art. The first limit portion 3 is pressed into the first through hole 10 at the connecting section 110, and the limit frame 9 is inserted between two adjacent coils of spring wire at the edge of the connecting section 110 to complete the assembly, which can effectively improve the stability of the tension spring mechanism and is suitable for various tension spring mechanisms. In addition, compared with the existing structure, the present invention does not require welding, does not affect the flexibility of the spring, can effectively avoid the formation of high stress areas, and almost no fatigue fracture will occur after long-term high-intensity use, which greatly improves the life of the tension spring mechanism and saves costs.

[0031] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A high-strength tension spring mechanism containing a metal sheet, comprising: A spring body (1) is formed by bending a spring wire and winding it multiple times and is columnar, and a first through hole (10) is formed in the spring body (1); Two pull tabs (2) are respectively connected to two ends of the spring body (1); Features: The pull tab (2) is formed with a first avoidance position (20) for accommodating the end of the spring body (1) and a limit frame (9) located at the rear side of the first avoidance position (20); a first limit portion (3) is protruding from the first avoidance position (20) for being positioned with the first through hole (10) of the spring body (1); the first limit portion (3) is close to the limit frame (9); the limit frame (9) is rotatably pressed between two adjacent coils of the end of the spring body (1) so that the end of the spring body (1) forms a connecting section (110); and the first limit portion (3) is penetrated into the first through hole (10) of the connecting section (110) to limit the connecting section (110) in the first avoidance position (20) and form a rotatable connection with the pull tab (2); the pull tab (2) is also provided with a first connecting hole (11) for connecting an external object at the end away from the first avoidance position (20).

2. A high-strength tension spring mechanism containing a metal sheet according to claim 1, characterized in that: The rear end of the limiting frame (9) is also formed with a second limiting portion (4) which protrudes outward and can extend into the first through hole (10) to limit the connecting section (110); the second limiting portion (4) is arranged in the first through hole (10).

3. A high-strength tension spring mechanism containing a metal sheet according to claim 2, characterized in that: The width of the second limiting portion (4) is consistent with that of the first limiting portion (3).

4. A high-strength tension spring mechanism containing a metal sheet according to claim 1, characterized in that: The first avoidance position (20) comprises a transverse hole (203) distributed transversely at the front end of the pull tab (2) and used for the spring body (1) to pass through, a first vertical hole (201) vertically opened from one end of the transverse hole (203) in the direction of the first connecting hole (11) and used for accommodating the spring body (1), and a second vertical hole (202) vertically opened from the other end of the transverse hole (203) in the direction of the first connecting hole (11) and used for accommodating the spring body (1), that is, the first avoidance position (20) is in a concave shape or an inverted concave shape.

5. The high-strength tension spring mechanism containing a metal sheet according to claim 1, characterized in that: The inner wall of the first connection hole (11) is also provided with a first arc groove (101) at an end away from the first avoidance position (20), and the size of the first arc groove (101) is smaller than the size of the first through hole (10).

6. A high-strength tension spring mechanism containing a metal sheet according to claim 1, characterized in that: The spring body (1) comprises a connecting section (110) connected to the first avoidance position (20) and a body section (120) integrally connected to the connecting section (110) and freely stretchable, wherein the connecting section (110) passes through a transverse hole (203) and spirally surrounds the first limiting portion (3), and the spring wire of the connecting section (110) is accommodated in the first vertical hole (201) and the second vertical hole (202).

7. A high-strength tension spring mechanism containing a metal sheet according to any one of claims 1 to 6, characterized in that: The width of the pull tab (2) gradually decreases from the first avoidance position (20) towards the first connection hole (11), and one end of the pull tab (2) close to the first connection hole (11) is in an arc shape.

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