Tension spring reset structure of ultra-thin keyboard switch stabilizer

Abstract

A tension spring reset structure of an ultra-thin keyboard switch stabilizer, comprising a base plate, a first stabilizer rotatably arranged on the base plate, a second stabilizer rotatably arranged on the base plate, an upper cover arranged above the first stabilizer and the second stabilizer, and a reset elastic member arranged between the first stabilizer and the second stabilizer. The first stabilizer and the second stabilizer intersect each other and are pivotally connected in a foldable manner. A first hooking opening is formed in a middle portion of the end of the first stabilizer close to the base plate. A second hooking opening is formed in a middle portion of the end of the second stabilizer close to the base plate. The reset elastic member is a tension spring. One end of the tension spring is hooked in the first hooking opening, and the other end of the tension spring is hooked in the second hooking opening. The tension spring reset structure of the ultra-thin keyboard switch stabilizer is easy to mount, reset is accurate and smooth, and the reset effect is good. Thus, good key-press feel is maintained, while the use requirements of being light and thin are met, and easy use is facilitated.

Description

Ultra-thin keyboard switch balance frame pull spring reset structure TECHNICAL FIELD

[0001] The utility model relates to key switch technical field especially relates to an ultra-thin keyboard open balance frame pull spring reset structure. BACKGROUND

[0002] Keyboard is used for operating equipment to run a kind of instruction and data input device, also refers to the function key of operating a machine or equipment by system arrangement, keyboard is the most common and the most main input device, and English letters, numbers, punctuation marks etc. are input to computer, to issue command, input data etc. to computer.

[0003] Traditional mechanical key using balance frame is usually using compression spring to provide the elastic force of reset action, but compression spring needs larger stroke to realize suitable pressing touch feeling, so that the overall thickness of key is larger, cannot achieve light and thin portable, do not meet the use demand of light and thin of contemporary notebook. UTILITY MODEL CONTENTS

[0004] In view of the above-mentioned insufficient, the utility model provides an ultra-thin keyboard open balance frame pull spring reset structure, which is convenient to install, accurate and smooth to reset, has good reset effect, ensures the pressing feeling and meets the use demand of light and thin, and is beneficial to use.

[0005] The utility model discloses a technical scheme that is adopted to achieve the above-mentioned purpose:

[0006] An ultra-thin keyboard open balance frame pull spring reset structure, comprising a substrate, a first balance frame rotatably arranged on the substrate, a second balance frame rotatably arranged on the substrate, an upper cover arranged on the first balance frame and the second balance frame, and a reset elastic body arranged between the first balance frame and the second balance frame, the first balance frame and the second balance frame are crossed and pivotally connected together in a stackable manner, a first hooking groove is formed in the middle of one end of the first balance frame close to the substrate, a second hooking groove is formed in the middle of one end of the second balance frame close to the substrate, and the reset elastic body is a pull spring, one end of the pull spring is hooked in the first hooking groove, and the other end of the pull spring is hooked in the second hooking groove.

[0007] As a further improvement of the utility model, a first hooking plate extending towards the middle of the substrate is formed in the middle of one end of the first balance frame close to the substrate, and the first hooking groove is formed in the middle of the first hooking plate; a second hooking plate extending towards the middle of the substrate is formed in the middle of one end of the second balance frame close to the substrate, and the second hooking groove is formed in the middle of the second hooking plate.

[0008] As a further improvement of the utility model, the first hooking plate is triangular as a whole, and the second hooking plate is triangular as a whole.

[0009] As a further improvement of the utility model, the first hooking groove is triangular as a whole, and the second hooking groove is triangular as a whole.

[0010] As a further improvement of the utility model, the middle part of the base plate is provided with a reset limiting plate extending upwards on both sides, and the reset elastic body is located between the two reset limiting plates.

[0011] As a further improvement of the utility model, the upper cover is provided with a second upper limiting block embedded in the second balance frame on both sides of one end, and the second balance frame is provided with a second upper limiting hole on both sides of one end for the rotation of the second upper limiting block.

[0012] As a further improvement of the utility model, the second balance frame comprises a second plate body rotatably arranged on the base plate, and a second extension plate extending upwards from one end of the second plate body, and the second upper limiting hole is arranged on one end of the second plate body, on the second extension plate or on the connection between the second plate body and the second extension plate; the second upper limiting block is L-shaped as a whole, and the horizontal part is hooked on the second upper limiting hole.

[0013] As a further improvement of the utility model, the other end of the upper cover is provided with a first upper limiting hole on both sides for the embedding of the first balance frame, and the first balance frame is provided with a first upper limiting block rotatably embedded in the first upper limiting hole on both sides of one end.

[0014] As a further improvement of the utility model, the other end of the second balance frame is provided with a second lower limiting block rotatably embedded in the base plate on both sides, and one end of the base plate is provided with a second lower limiting hole for the rotation of the second lower limiting block.

[0015] As a further improvement of the utility model, the other end of the first balance frame is provided with a first lower limiting block rotatably embedded in the base plate on both sides, and the other end of the base plate is provided with a first lower limiting hole for the rotation of the first lower limiting block.

[0016] The utility model has the advantages of:

[0017] The reset structure is provided with a base plate, a first balance frame rotatably arranged on the base plate, a second balance frame rotatably arranged on the base plate, an upper cover arranged on the first balance frame and the second balance frame, and a reset elastic body arranged between the first balance frame and the second balance frame.

[0018] When the upper cover is pressed by an external force, the upper cover presses on the first balance frame and the second balance frame, thereby pressing the first balance frame and the second balance frame downward, the distance between the first balance frame and the second balance frame is increased, the first hooking groove of the first balance frame pulls one end of the tension spring outward, the second hooking groove of the second balance frame pulls the other end of the tension spring outward, the tension spring is deformed, after the external force is removed from the upper cover, the tension spring is contracted and reset under the elastic restoring force of the tension spring, one end of the tension spring pulls the first balance frame inward through the first hooking groove, the other end of the tension spring pulls the second balance frame inward through the second hooking groove, thereby pulling the first balance frame and the second balance frame inward to achieve the purpose of lifting and resetting the first balance frame and the second balance frame, the upper cover arranged on the first balance frame and the second balance frame is synchronously lifted, the reset action of the key switch is completed, the reset process is accurate and smooth, and the reset effect is good. By using the tension spring, the tension spring has a high elastic coefficient and can quickly recover to the original state after being stressed, thereby effectively improving the reset efficiency of the balance frame and the reset efficiency of the key switch. The manufacturing material of the tension spring is usually high-quality alloy steel or stainless steel, which has excellent corrosion resistance and fatigue resistance, so that the tension spring can maintain stable and reliable performance in long-term use, effectively guaranteeing the service life of the reset structure, and the shape and size of the tension spring can be manufactured according to actual needs, so that the tension spring is easy to install and replace, beneficial to production, and effectively improves the assembly efficiency of the key switch. The manufacturing cost of the tension spring is relatively low, and the price is relatively affordable, thereby effectively reducing the production cost of the reset structure. The overall height of the tension spring is low, which not only ensures the pressing feeling but also meets the light and thin use demand, and is beneficial to use.

[0019] The above is a summary of the utility model technical scheme, and the utility model will be further described in combination with the drawings and the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is a schematic diagram of the whole utility model;

[0021] Fig. 2 is a schematic diagram of the structure of the utility model without the upper cover;

[0022] Fig. 3 is a schematic diagram of the structure of the second balance frame;

[0023] Fig. 4 is a structural schematic diagram of the first balance frame;

[0024] Fig. 5 is a structural schematic diagram of the upper cover;

[0025] Fig. 6 is a structural schematic diagram of the base plate;

[0026] Fig. 7 is a side schematic diagram of the utility model;

[0027] Fig. 8 is another overall schematic diagram of the utility model;

[0028] In the figure: 1, base plate; 11, reset limiting plate; 12, second lower limiting hole; 13, first lower limiting hole; 2, first balance frame; 21, first hooking plate; 22, first hooking groove; 23, first upper limiting block; 24, first lower limiting block; 3, second balance frame; 31, second hooking plate; 32, second hooking groove; 33, second upper limiting hole; 34, second plate body; 35, second extension plate; 36, second lower limiting block; 4, upper cover; 41, second upper limiting block; 42, first upper limiting hole; 5, reset elastic body. DETAILED DESCRIPTION

[0029] In order to further illustrate the technical means and effects taken by the utility model to achieve the predetermined purpose, the specific embodiments of the utility model are described in detail below in combination with the drawings and preferred embodiments.

[0030] In the description of the utility model, it is understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0031] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0032] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can through intermediate medium indirectly connect, can be two element inside's intercommunication or two element's interaction relationship. For the ordinary skill in the art, can understand the concrete meaning of the above terms in the utility model according to specific circumstances.

[0033] Please refer to Fig. 1 to Fig. 7, the utility model embodiment provides a kind of ultra-thin keyboard open balance bracket tension spring reset structure, including a substrate 1, a first balance bracket 2 is rotationally arranged in the substrate 1, a second balance bracket 3 is rotationally arranged in the substrate 1, an upper cover 4 is arranged in the first balance bracket 2 and second balance bracket 3, a reset elastic body 5 is arranged between the first balance bracket 2 and second balance bracket 3, first balance bracket 2 and second balance bracket 3 cross each other and can be superimposedly hinged together, the middle part of one end of the first balance bracket 2 close to substrate 1 is formed with a first hooking groove 22, the middle part of one end of the second balance bracket 3 close to substrate 1 is formed with a second hooking groove 32, the reset elastic body 5 is tension spring, one end of tension spring is hooked in the first hooking groove 22, the other end is hooked in second hooking groove 32.

[0034] When the upper cover 4 is pressed down by an external force, the upper cover 4 presses on the first balance frame 2 and the second balance frame 3 to press down the first balance frame 2 and the second balance frame 3, the distance between the first balance frame 2 and the second balance frame 3 increases, the first hooking groove 22 of the first balance frame 2 pulls one end of the tension spring outward, the second hooking groove 32 of the second balance frame 3 pulls the other end of the tension spring outward, and the tension spring deforms. After the external force is removed from the upper cover 4, the tension spring is contracted and reset under the elastic restoring force of the tension spring itself. One end of the tension spring pulls the first balance frame 2 inward through the first hooking groove 22, and the other end of the tension spring pulls the second balance frame 3 inward through the second hooking groove 32, so as to pull the first balance frame 2 and the second balance frame 3 inward to achieve the purpose of lifting and resetting the first balance frame 2 and the second balance frame 3. The upper cover 4 arranged on the first balance frame 2 and the second balance frame 3 is lifted synchronously to complete the resetting action of the key switch. The whole process is reset accurately and smoothly, and the resetting effect is good. By using the tension spring, the tension spring has a high elastic coefficient and can quickly recover to the original state after being stressed, thereby effectively improving the balance frame resetting efficiency and the key switch resetting efficiency. The manufacturing material of the tension spring is usually high-quality alloy steel or stainless steel, which has excellent corrosion resistance and fatigue resistance, so that the tension spring can maintain stable and reliable performance during long-term use, effectively ensuring the service life of the resetting structure. The shape and size of the tension spring can be manufactured according to actual needs, which is easy to install and replace, beneficial to production, and effectively improves the assembly efficiency of the key switch. The manufacturing cost of the tension spring is relatively low, and the price is relatively affordable, which effectively reduces the production cost of the resetting structure. The overall height of the tension spring is low, which not only ensures the pressing feeling but also meets the light and thin use demand, which is beneficial to use.

[0035] Preferably, as shown in FIGS. 2-4, the first balance frame 2 is formed with a first hooking plate 21 extending to the middle part of the substrate 1 at the middle part of one end close to the substrate 1, and the first hooking groove 22 is formed in the middle part of the first hooking plate 21. One end of the tension spring is hooked in the first hooking groove 22, so that the one end of the tension spring is close to the inside of the substrate 1, avoiding affecting the normal operation of the tension spring when the second balance frame 3 is overlapped on the first balance frame 2 during pressing, and ensuring the normal operation of the resetting structure. The second balance frame 3 is formed with a second hooking plate 31 extending to the middle part of the substrate 1 at the middle part of one end close to the substrate 1, and the second hooking groove 32 is formed in the middle part of the second hooking plate 31. The other end of the tension spring is hooked in the second hooking groove 32, so that the one end of the tension spring is close to the inside of the substrate 1, avoiding affecting the normal operation of the tension spring when the first balance frame 2 is overlapped on the second balance frame 3 during pressing, and further ensuring the normal operation of the resetting structure.

[0036] Preferably, as shown in FIGS. 2-4, the first hooking plate 21 is triangular in shape as a whole, and the second hooking plate 31 is triangular in shape as a whole. The triangular shape has stability, and by setting the first hooking plate 21 to be triangular, the connection between the first hooking plate 21 and the first balance frame 2 is more tightly and solidly connected, reducing the possibility that the first hooking plate 21 is broken and cannot support the tension spring during the operation of the first balance frame 2. By setting the second hooking plate 31 to be triangular, the connection between the second hooking plate 31 and the second balance frame 3 is more tightly and solidly connected, reducing the possibility that the second hooking plate 31 is broken and cannot support the tension spring during the operation of the second balance frame 3. Further, the normal operation of the reset structure is ensured.

[0037] Preferably, as shown in FIGS. 2-4, the first hooking groove 22 is triangular in shape as a whole, and the second hooking groove 32 is triangular in shape as a whole. By setting the first hooking groove 22 to be triangular, the first hooking plate 21 is better maintained in a triangular structure, the triangular shape has stability, and the connection between the first hooking plate 21 and the first balance frame 2 is more tightly and solidly connected, reducing the possibility that the first hooking plate 21 is broken and cannot support the tension spring during the operation of the first balance frame 2. By setting the second hooking groove 32 to be triangular, the second hooking plate 31 is better maintained in a triangular structure, the triangular shape has stability, and the connection between the second hooking plate 31 and the second balance frame 3 is more tightly and solidly connected, reducing the possibility that the second hooking plate 31 is broken and cannot support the tension spring during the operation of the second balance frame 3.

[0038] In order to prevent the tension spring from being displaced during the operation of the first balance frame 2 and the second balance frame 3, causing the reset to be inaccurate and not smooth, as shown in FIGS. 2 and 6, the middle portion of the base plate 1 is formed with a reset limiting plate 11 extending upward on both sides, and the reset elastic body 5 is located between the two reset limiting plates 11, thereby limiting the position of the reset elastic body 5, preventing the reset elastic body 5 from being displaced during the operation of the first balance frame 2 and the second balance frame 3, causing the reset to be inaccurate and not smooth, and ensuring the reset accuracy and reset efficiency of the reset structure.

[0039] The specific way of fixing and mounting the upper cover 4 is shown in FIGS. 2, 3, 5 and 8. One end of the upper cover 4 is provided with a second upper limiting block 41 embedded in the second balance frame 3. The second balance frame 3 is formed with a second upper limiting hole 33 at one end for the rotation of the second upper limiting block 41. The substrate 1 is mounted on the circuit board of the keyboard. When an external force presses the upper cover 4, the second upper limiting block 41 on the upper cover 4 is embedded in the second upper limiting hole 33, thereby driving the second balance frame 3 to move downward. Since the first balance frame 2 and the second balance frame 3 are crossed and pivotally connected together, the second balance frame 3 synchronously drives the first balance frame 2 to move downward and pulls the reset elastic body 5 to deform. After the multi-angle balance of the key switch is moved downward, the conduction assembly in the key switch is conducted to output the signal outward, which is beneficial to the cooperation between the components. When the external force is removed from the upper cover 4, the reset elastic body 5 is reset under the elastic restoring force of itself. The reset elastic body 5 contracts to pull the first balance frame 2 and the second balance frame 3 to rise, thereby lifting the upper cover 4 to reset and disconnecting the conduction between the conduction assemblies, waiting for the next use. The whole process is smooth, the structure is simple, and it is beneficial to production and use. The reset is accurate and smooth, and the reset effect is good.

[0040] The specific structure of the conduction assembly is shown in the above. The conduction assembly can be a mechanical spring conduction, a light conduction, a magnetic shaft conduction, a magnetic induction conduction, etc. These conduction structures are conventional technical means in the art, and therefore are not described in detail in this embodiment.

[0041] The specific structure of the second upper limiting block 41 and the second upper limiting hole 33 is shown in FIGS. 2, 3, 5 and 8. The second balance frame 3 includes a second plate body 34 pivotally arranged on the substrate 1 and a second extension plate 35 formed at one end of the second plate body 34 and extending upward. The second upper limiting hole 33 is arranged at one end of the second plate body 34 or on the second extension plate 35 or at the connection between the second plate body 34 and the second extension plate 35, which can be arranged according to the actual situation, and therefore is not limited in this embodiment. The second upper limiting block 41 is in the shape of L. The horizontal part of the second upper limiting block 41 is hooked on the second upper limiting hole 33, so that the upper cover 4 can be hooked on the second upper limiting hole 33 through the second upper limiting block 41 to drive the second balance frame 3 to move downward and reset upward. The L-shaped structure only needs to pass the horizontal part of the second upper limiting block 41 through the second upper limiting hole 33 during assembly. The whole structure is simple, convenient to install, beneficial to production, accurate and smooth in reset, and good in reset effect. The second hook plate 31 and the second lower limiting block 36 are arranged on the second plate body 34.

[0042] When the external force presses the upper cover 4, the upper cover 4 moves downward and presses on the second extension plate 35, driving the second extension plate 35 to move downward, thereby driving the second balance frame 3 to move downward. When the external force is removed from the upper cover 4, the reset elastic body 5 is retracted under the elastic restoring force of itself, and the second upper limit block 41 on the upper cover 4 presses on the upper end face of the second upper limit hole 33, thereby lifting the second balance frame 3 to reset, driving the first balance frame 2 and the second balance frame 3 to move upward to reset, thereby improving the reset efficiency of the mounting structure.

[0043] For the specific way in which the upper cover 4 is arranged on the first balance frame 2, as shown in FIGS. 2, 4, 5, 7 and 8, the other end of the upper cover 4 is formed with first upper limit holes 42 on both sides for embedding the first balance frame 2, and the first balance frame 2 is formed with first upper limit blocks 23 on both sides of one end for rotating and embedding in the first upper limit holes 42. When assembly is required, the first upper limit blocks 23 only need to be aligned with the first upper limit holes 42 for embedding, and the overall structure is simple, convenient to install, and beneficial to production.

[0044] When the external force presses the upper cover 4, the upper cover 4 drives the second balance frame 3 to press downward, and the upper cover 4 drives the first upper limit block 23 to press downward through the first upper limit hole 42, while the first upper limit block 23 rotates on the first upper limit hole 42, thereby realizing normal downward movement of the first balance frame 2 driven by the upper cover 4, and the first balance frame 2 and the second balance frame 3 cooperate with each other to make the key switch perform uniform downward movement regardless of the position of the upper cover 4 pressed by the external force, thereby realizing conduction of the conduction assembly in the key switch and completing signal output. When the external force is removed from the upper cover 4, the reset elastic body 5 is retracted under the elastic restoring force of itself, and the reset elastic body 5 retracts to pull up the first balance frame 2 and the second balance frame 3, the first upper limit block rotates on the first upper limit hole 42, and the three cooperate to lift the upper cover 4 to reset, so that the conduction between the conduction assemblies is disconnected, waiting for the next use. The whole process is reset accurately and smoothly, and the reset effect is good.

[0045] For the specific way that the second balance frame 3 is arranged to rotate on the base plate 1, as shown in Figures 2, 4, 6-8, the other end of the second balance frame 3 is formed with a second lower limit block 36 that is arranged to rotate into the base plate 1 on both sides, and the one end of the base plate 1 is formed with a second lower limit hole 12 into which the second lower limit block 36 is arranged to rotate. When assembly is required, the second lower limit block 36 is only arranged to rotate into the second lower limit hole 12, and the overall structure is simple, convenient to install, and beneficial to production. The base plate 1 is arranged on the circuit board of the keyboard, so that the second balance frame 3 is limited on the base plate 1, the normal operation of the second balance frame 3 is ensured, and the second balance frame 3 rotates in the second lower limit hole 12 during the process of moving down or moving up and resetting, so that the flexibility of the second balance frame 3 is ensured, the resetting process is accurate and smooth, and the resetting effect is good.

[0046] For the specific way that the first balance frame 2 is arranged on the base plate 1, as shown in Figures 2, 3, 6-8, the other end of the first balance frame 2 is formed with a first lower limit block 24 that is arranged to rotate into the base plate 1 on both sides, and the other end of the base plate 1 is formed with a first lower limit hole 13 into which the first lower limit block 24 is arranged to rotate. When assembly is required, the first lower limit block 24 is only arranged to rotate into the first lower limit hole 13, and the overall structure is simple, convenient to install, and beneficial to production. The base plate 1 is arranged on the circuit board of the keyboard, so that the first balance frame 2 is limited on the base plate 1, the normal operation of the first balance frame 2 is ensured, and the first balance frame 2 rotates in the first lower limit hole 13 during the process of moving down or moving up and resetting, so that the flexibility of the first balance frame 2 is ensured, the resetting process is accurate and smooth, and the resetting effect is good.

[0047] It should be noted that the ultra-thin keyboard opening balance frame tension spring resetting structure disclosed in the utility model is improved in the specific structure, and the specific control mode is not the innovation point of the utility model. The circuit board, keyboard, conduction assembly, tension spring and other components involved in the utility model can be general standard components or components known to those skilled in the art, and the structure, principle and control mode are known to those skilled in the art through technical manuals or through conventional experimental methods.

[0048] The above is only a preferred embodiment of the utility model, and does not limit the technical range of the utility model in any way, so other structures obtained by using the same or similar technical features as the above-mentioned embodiments of the utility model are within the protection scope of the utility model.

Claims

1. An ultra-thin keyboard open balance frame pull spring reset structure, comprising a base plate, a first balance frame rotatably arranged on the base plate, a second balance frame rotatably arranged on the base plate, an upper cover arranged on the first balance frame and the second balance frame, a reset elastic body arranged between the first balance frame and the second balance frame, and the first balance frame and the second balance frame are crossed and pivotally connected together in a stackable manner, characterized in that: The first balance frame is formed with a first hooking groove in the middle of one end close to the substrate, the second balance frame is formed with a second hooking groove in the middle of one end close to the substrate, and the reset elastic body is a tension spring, one end of which is hooked in the first hooking groove and the other end is hooked in the second hooking groove. ​ 2. The ultra-thin keyboard open-balance frame pull spring return structure according to claim 1, characterized in that: The first balance frame is formed with a first hooking plate extending to the middle of the substrate in the middle of one end close to the substrate, and the first hooking groove is formed in the middle of the first hooking plate; the second balance frame is formed with a second hooking plate extending to the middle of the substrate in the middle of one end close to the substrate, and the second hooking groove is formed in the middle of the second hooking plate.

3. The ultra-thin keyboard open-balance frame pull spring return structure according to claim 2, characterized in that: The first hooking plate is in the shape of a triangle as a whole, and the second hooking plate is in the shape of a triangle as a whole.

4. The ultra-thin keyboard open-balance frame pull spring return structure according to claim 2, characterized in that: The first hooking groove is in the shape of a triangle as a whole, and the second hooking groove is in the shape of a triangle as a whole.

5. The ultra-thin keyboard open-balance frame pull spring return structure according to claim 1, characterized in that: The middle of the substrate is formed with a reset limiting plate extending upward on each side, and the reset elastic body is located between the two reset limiting plates.

6. The ultra-thin keyboard open-balance frame pull spring return structure according to claim 1, characterized in that: One end of the upper cover is provided with a second upper limiting block embedded in the second balance frame on each side, and the second balance frame is formed with a second upper limiting hole on each side of one end for the second upper limiting block to be embedded and rotated.

7. The ultra-thin keyboard open-balance frame pull spring return structure according to claim 1, characterized in that: The second balance frame comprises a second plate body rotatably arranged on the substrate and a second extension plate extending upward from one end of the second plate body, and the second upper limiting hole is arranged on one end of the second plate body, on the second extension plate or on the connection between the second plate body and the second extension plate; the second upper limiting block is in the shape of an L as a whole, and the horizontal part of the second upper limiting block is hooked on the second upper limiting hole.

8. The ultra-thin keyboard open-balance frame pull spring return structure according to claim 1, characterized in that: The other end of the upper cover is formed with a first upper limiting hole on each side for the first balance frame to be embedded, and the first balance frame is formed with a first upper limiting block rotatably embedded in the first upper limiting hole on each side of one end.

9. The ultra-thin keyboard open-balance frame pull spring return structure of claim 1, wherein: The other end of the second balance frame is formed with a second lower limiting block rotatably embedded in the substrate on each side, and one end of the substrate is formed with a second lower limiting hole for the second lower limiting block to be embedded and rotated.

10. The ultra-thin keyboard open-balance frame tension spring return structure of claim 1, wherein: The other end of the first balance frame is formed with a first lower limiting block rotatably embedded in the substrate on each side, and the other end of the substrate is formed with a first lower limiting hole for the first lower limiting block to be embedded and rotated.

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