Supporting base easy and convenient to open and close based on torsion spring structure

Abstract

The utility model discloses a torsion spring structure-based simple opening and closing support base, which comprises a main rod, a support, a connecting rod, a sliding part and a fixed part, the sliding part is sleeved on the main rod and slides up and down along the main rod, the fixed part is arranged at the lower end part of the main rod, and the connecting rod is arranged on the support. One end of the connecting rod is rotationally connected with the fixing part; the other end of the connecting rod is provided with a rotating shaft part, the rotating shaft part comprises a first rotating shaft and a second rotating shaft, the first rotating shaft is in rotating fit with a shaft groove in the inner shell of the support, the second rotating shaft is sleeved with an elastic piece, the elastic piece is provided with a spring body and spring arms, and the spring arms comprise the first spring arm and the second spring arm. The first spring arm and the second spring arm are arranged at the two ends of the spring body respectively, the first spring arm abuts against the clamping groove wall on the inner shell, the second spring arm abuts against the outer shell of the support, and the beneficial effects that the number of the connecting rods is reduced, and the production cost is reduced are achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of live streaming shooting stands, and in particular to a simple opening and closing support base based on a torsion spring structure. Background Technology

[0002] In the current booming live streaming industry, live streaming stands, as core equipment for supporting and securing shooting devices, directly impact the quality of live stream footage. Traditional live streaming stands use clips or bolts to open and close the legs. The triangular support section is bulky and heavy, requiring manual pushing and pulling of the legs for folding and unfolding. Furthermore, due to its less-than-compact design, it occupies a significant amount of space, making it extremely inconvenient to carry. For professionals who frequently travel between different locations for live streaming, carrying a heavy and difficult-to-fold stand not only consumes considerable physical strength but also increases transportation and time costs, significantly reducing work efficiency. Existing automatic opening and closing mechanisms for the support base use a large return spring combined with upper and lower connecting rods to achieve semi-automatic opening. This involves numerous components and complex assembly. The elastic potential energy of the large return spring is wasted on the semi-automatic opening function, indicating potential for cost reduction. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, this utility model provides a simple opening and closing support base based on a torsion spring structure. It solves the technical problems of complex structure, many parts and high production cost caused by the existing support base using two connecting rods and a relatively large-volume return spring sleeved on the main rod to provide return elastic potential energy to open the support base.

[0004] This utility model achieves the above-mentioned objective through the following technical solution: a simple opening and closing support base based on a torsion spring structure, the support base including a main rod, a bracket, a connecting rod, a sliding part, and a fixing part. The sliding part is sleeved on the main rod and slides up and down along the main rod. The fixing part is located at the lower end of the main rod. One end of the connecting rod is rotatably connected to the fixing part. The other end of the connecting rod is provided with a rotating shaft part, the rotating shaft part including a first rotating shaft and a second rotating shaft. The first rotating shaft is rotatably engaged with a shaft groove on the inner shell of the bracket. An elastic element is sleeved on the second rotating shaft. The elastic element has a spring body and a spring arm. The spring arm includes a first spring arm and a second spring arm, which are respectively located at both ends of the spring body. The first spring arm abuts against the groove wall on the inner shell, and the second spring arm abuts against the outer shell of the bracket.

[0005] Preferably, the rotating shaft passes through a through hole in the inner shell, and the shaft groove is located on the outer side of the inner shell.

[0006] Preferably, the outer shell has a slot on its side, and the side of the inner shell is inserted into the slot to assemble the inner shell and the outer shell together.

[0007] Preferably, one end of the connecting rod has a third rotating shaft that is rotatably connected to the fixing part through the cooperation of the rotating shaft and the shaft hole.

[0008] Preferably, the bottom end of the main rod is provided with a hanging groove button, and the center of the hanging groove button is fixedly connected to the center of the fixing part by screws.

[0009] Preferably, a small return spring is provided between the hanging slot button and the fixing part, and the small return spring is sleeved on the outside of the center part of the hanging slot button and the fixing part.

[0010] Preferably, the hanging slot button is surrounded by a hanging ring, and the bottom end of the bracket has a buckle. When the support base is closed, the buckle engages with the hanging ring, so that the support base is closed into a cylindrical shape.

[0011] Preferably, the elastic element is a torsion spring, and the first spring arm and the second spring arm are two independent support arms.

[0012] Preferably, the elastic element is a torsion spring, the first spring arm is an inverted U-shaped support arm, and the horizontal arm of the inverted U-shaped support arm abuts against the groove wall on the inner shell.

[0013] Preferably, the spring body has left and right spring body parts, and the second rotating shaft has a short rotating shaft that cooperates with the left and right spring body parts, and there is an assembly space between the short rotating shafts.

[0014] Compared with the prior art, the beneficial effects obtained by this utility model are:

[0015] This utility model discloses a simple opening and closing support base based on a torsion spring structure. The support base includes a main rod, a bracket, a connecting rod, a sliding part, and a fixing part. The sliding part is sleeved on the main rod and slides up and down along the main rod. The fixing part is located at the lower end of the main rod. One end of the connecting rod is rotatably connected to the fixing part. The other end of the connecting rod is provided with a rotating shaft, which includes a first rotating shaft and a second rotating shaft. The first rotating shaft is rotatably engaged with a groove on the inner shell of the bracket. An elastic element is sleeved on the second rotating shaft. The elastic element has a spring body and a spring arm. The spring arm includes a first spring arm and a second spring arm, which are respectively located at both ends of the spring body. The first spring arm abuts against the groove wall on the inner shell, and the second spring arm abuts against the outer shell of the bracket. This invention solves the technical problems of existing support bases that use two connecting rods linked together and simultaneously use a large-volume return spring sleeved on the main rod to provide return elastic potential energy to open the support base, resulting in complex structure, many parts, and high production costs. It has the beneficial effect of reducing the number of connecting rods and reducing production costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0017] Figure 1 This is an enlarged assembly diagram of the simple opening and closing support base based on a torsion spring structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the assembly of the inner shell and connecting rod of the simple opening and closing support base based on the torsion spring structure of this utility model.

[0019] Figure 3 This is an exploded view of the simple opening and closing support base based on a torsion spring structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the torsion spring of the simple opening and closing support base based on the torsion spring structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the connecting rod structure of the simple opening and closing support base based on a torsion spring structure according to this utility model.

[0022] Figure 6 This is a schematic diagram of the assembly of the inner and outer shells of the simple opening and closing support base based on a torsion spring structure according to this utility model.

[0023] Reference numerals: 1-Main rod; 2-Bracket; 21-Inner shell; 211-Shaft groove; 212-Blocking block; 22-Outer shell; 221-Slot; 23-Snap-on; 3-Connecting rod; 31-Rotating shaft; 311-First rotating shaft; 312-Second rotating shaft; 32-Third rotating shaft; 4-Sliding part; 5-Fixing part; 6-Elastic element; 61-Spring body; 62-Spring arm; 621-First spring arm; 622-Second spring arm; 7-Hanging slot button; 71-Hanging ring. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the described embodiments are only some embodiments of the present invention, and not all embodiments. The terms "left," "right," "large," and "small" in the embodiments are used to distinguish technical features and are not intended to limit the size and orientation of the technical features. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0025] A simple opening and closing support base based on a torsion spring structure is disclosed. The support base includes a main rod 1, a bracket 2, a connecting rod 3, a sliding part 4, and a fixing part 5. The sliding part 4 is sleeved on the main rod 1 and slides up and down along it. The sliding part 4 is rotatably connected to a rotating shaft at the upper end of the inner shell 21 of the bracket 2 via a rotating shaft hole at its upper end. The lower half of the inner shell 21 has a through hole for the end of the connecting rod 3 with the rotating shaft part 31 to pass through. A shaft groove 21 is provided on the outer side of the through hole. 1. The rotating shaft 31 includes a first rotating shaft 311 and a second rotating shaft 312. The first rotating shaft 311 is rotatably connected to the shaft groove 211. An elastic element 6 is sleeved on the second rotating shaft 312. The elastic element 6 is a torsion spring. The elastic element 6 has a spring body 61 and a spring arm 62. The spring arm 62 includes a first spring arm 621 with an inverted U-shaped support and a second spring arm 622 with two support legs. The first spring arm 621 and the second spring arm 622 are respectively disposed on the spring body 61. At both ends, the first spring arm 621 abuts against the slot wall on the inner shell 21. The inner shell 21 also includes a blocking block 212 for preventing the first spring arm 621 from coming out. The blocking block 212 has a through hole for the second spring arm 622 and a stop block for pressing the first spring arm 621. The blocking block 212 is fastened to the through hole. The second spring arm 622 abuts against the outer shell 22 of the bracket 2. The spring body 61 has two parts corresponding to the second spring arm 622 with two legs. The second rotating shaft 312 includes a short rotating shaft that cooperates with the two parts of the spring body. There is an assembly space between the short rotating shafts. The fixing part 5 is provided at the lower end of the main rod 1. The other end of the connecting rod 3 has a third rotating shaft 32 that is rotatably connected to the fixing part 5 through the cooperation of the rotating shaft and the shaft hole. The side end of the outer shell 22 has a slot 221. The side end of the inner shell 21 is inserted into the slot 221 to realize the combined assembly of the inner shell 21 and the outer shell 22.

[0026] The bottom end of the main rod 1 is provided with a hanging groove button 7. The center of the hanging groove button 7 is fixedly connected to the center of the fixing part 5 by screws. A small return spring is provided between the hanging groove button 7 and the fixing part 5. The small return spring is sleeved on the outside of the center of the hanging groove button 7 and the fixing part 5. A hanging ring 71 is provided around the hanging groove button 7. The bottom end of the bracket 2 has a buckle 23. When the support base is closed, the buckle 23 is engaged with the hanging ring 71, so that the support base is closed into a column shape.

[0027] The bracket 2 consists of three equal arc-shaped structural components. When closed, the bracket 2 forms a cylinder. Each arc-shaped structure is equipped with a connecting rod and a torsion spring. A torsion spring is a mechanical element that stores and releases torque through elastic deformation and is widely used in machinery, electronics, automobiles, and other fields. A traditional torsion spring includes a helical body (spring body), a support leg, and a fixed end (spring arm). The spring body is a helical metal wire, and its mechanical properties are determined by the wire diameter, number of turns, and mean diameter. One end of the spring arm is fixed to the base or directly abuts against it, while the other end connects to the force-bearing component, transmitting torque through rotation. Some designs incorporate hooks, bends, or other structures for easy installation and force transmission. Some torsion springs include dampers or preload devices to control the torque release speed or initial force. When an external force is applied to the movable support leg, the helical body undergoes torsional deformation, generating shear stress within the material and storing elastic potential energy. The magnitude of the torque is directly proportional to the torsion angle (following the extended form of Hooke's Law: T = k⋅θ, where T is the torque, k is the torsional stiffness, and θ is the torsion angle). During the loading phase, the external force causes the spring to torsion, increasing its potential energy. During the unloading phase, after the external force is removed, the spring returns to its original state, releasing its potential energy to drive the component to reset or maintain a specific angle. The storage and conversion of elastic potential energy through the loading and unloading of the torsion spring enables the opening and closing of the support.

[0028] In another embodiment, the elastic element is a torsion spring, and the first spring arm and the second spring arm are two independent support arms. Example 2

[0029] A live-streaming shooting stand including a support base with easy opening and closing features includes an electronic device clamping part, a rod body, and a support base. The electronic device clamping part is connected to the rod body via a rotating mechanism. The rotating mechanism includes a first positioning gear, a second positioning gear, and a housing. The housing includes an upper rack fixing frame, a track housing, and a lower rack fixing frame. The track housing is fixedly connected between the upper rack fixing frame and the lower rack fixing frame. U-shaped grooves are respectively provided at the ends of the upper rack fixing frame and the lower rack fixing frame away from the track housing to accommodate the first positioning gear and the second positioning gear. The housing has an internal cavity for placing and restricting the movement trajectory of the upper and lower positioning racks and the positioning rack spring. The positioning rack spring is in a pre-compressed but not fully compressed state and is positioned between the upper and lower positioning racks. The upper and lower positioning racks are located away from the positioning rack spring. The upper positioning rack has teeth at its ends for engaging with the teeth on the first and second positioning gears to lock the rotation angle. The toothed end of the upper positioning rack passes through the central limiting hole of the upper rack fixing frame and engages with the first positioning gear in the U-shaped groove. The first positioning gear is fixedly mounted on the back of the electronic device clamping part. The toothed end of the lower positioning rack passes through the central limiting hole of the lower rack fixing frame and engages with the second positioning gear in the U-shaped groove. The second positioning gear is fixedly mounted on the end of the live broadcast shooting frame. The teeth of the first and second positioning gears are all pointed teeth, conical teeth, or acute-angled teeth. The volume of the teeth gradually decreases from the root to the tip, and there is a smooth transition curve at the tip of the teeth, which facilitates engagement and locking or angle switching with the teeth at the ends of the upper and lower positioning racks.

[0030] Furthermore, the U-shaped grooves at the ends of the upper rack fixing bracket and the lower rack fixing bracket away from the track housing are rotatably connected to the first positioning gear and the second positioning gear via a gear shaft assembly.

[0031] In another embodiment, the two ends of the outer casing are respectively provided with U-shaped grooves, and the middle part of the U-shaped groove is provided with teeth for meshing with the first positioning gear and the second positioning gear.

[0032] In another embodiment, the upper rack fixing bracket and the lower rack fixing bracket are respectively provided with U-shaped grooves at their ends away from the track housing, and the middle part of the U-shaped groove is provided with teeth for meshing with the first positioning gear and the second positioning gear.

[0033] The rack and pinion retainer is locked when its end meshes with the teeth of the positioning gear. When angle adjustment is required, a rotational force is applied to the electronic device clamping part or the rotating mechanism, further compressing the positioning rack spring. This causes a relative rotation between the teeth of the first positioning gear and the tooth opening of the upper rack and pinion retainer, thereby engaging and locking the tooth opening with the next tooth. The principle of angle switching between the rotating mechanism and the rod is the same as described above.

[0034] When retracted, the electronic device clamping part is a short cylindrical shape. The clamping part includes a main body, a left clamping part, a right clamping part, a left slide rod, and a right slide rod. The left slide rod includes a bolt, an outer slide rod, a connecting part, and a spring. The spring is sleeved on the bolt, and the outer slide rod is sleeved outside the spring. One end of the spring contacts the bolt head, and the other end of the spring contacts the inner end of the outer slide rod. The length of the outer slide rod is less than the length of the bolt. The outer portion of the bolt's threaded section is fixedly connected to the side end of the connecting part. The outer slide rod has a protrusion on its outer side. The clamping part has a left slide groove for receiving the outer slide rod. The left slide groove has a track for limiting the protrusion of the outer slide rod. The track has a blocking part at the left end. In the working state, when a pulling force is applied, the connecting part extends outward with the left clamping part. At this time, the spring is compressed and has elastic potential energy to provide force for clamping the mobile phone. Specifically, the end of the spring that contacts the bolt head of the bolt applies a pushing force to the right, thereby tightening the connecting part and giving the left clamping part a clamping force. One end of the connecting part has a concave... The left clamping part is rotatably connected to the connecting part via the left rotating shaft, which is used to switch the working state and the storage state of the left clamping part. The right sliding rod includes a limit buckle and a right pull rod. The limit buckle is fastened to one end of the right pull rod by a limit screw. The limit buckle cooperates with a protrusion on the main body of the clamping part to achieve limitation. The protrusion is set in the right sliding groove. The cross-section of the protrusion and the limit buckle are L-shaped and interlocked together in the right sliding groove. The right sliding groove is used to limit the horizontal sliding trajectory of the right pull rod. To minimize its wobbling, the right exit end of the right slide groove is provided with a protrusion to prevent the limit buckle from sliding out of the right slide groove completely; the other end of the right pull rod is provided with a groove and a right rotating shaft provided in the groove, and the right clamping part is rotatably connected to the right pull rod through the right rotating shaft for switching between the working state and the storage state of the right clamping part; the right slide rod is located inside the left slide rod, and the protrusion is a U-shaped structure. When the electronic device clamping part is open and in the working state, the spring is compressed and the elastic force provided clamps the mobile phone to ensure the stability of the mobile phone shooting.

[0035] The rod is composed of multiple hollow tubular structures. The inner and outer diameters of each tubular structure are designed with precision. The inner diameter of the rod between two adjacent sections is smaller than the outer diameter to ensure smooth telescopic nesting between adjacent sections while maintaining a certain degree of stability and rigidity. The length of a single hollow tube of the rod is no greater than the length of the support base's handle. When stored, the rod is housed by the support base. The telescopic locking structure between two adjacent hollow tubes is a threaded tightening type. The threaded tightening telescopic locking structure has internal and external threads at the end of each rod section. By rotating adjacent rod sections, the threads interlock, thereby fixing the telescopic position of the rod.

[0036] In another embodiment, the telescopic locking structure between two adjacent hollow tube sections is a snap-lock type telescopic locking structure with snaps and corresponding slots provided inside or outside the tube body. When the tube section is stretched to the appropriate position, the snaps will automatically engage with the corresponding slots to achieve locking.

[0037] In another embodiment, the telescopic locking structure between two adjacent hollow tube sections is a button-type telescopic locking structure. Specifically, a button is provided on the side of the rod body, and the button is connected to an internal spring and a locking device. When the button is pressed, the spring is compressed, the locking device is released, and the rod section can extend and retract freely; when the button is released, the spring returns to its original position, and the locking device locks the rod section.

[0038] In another embodiment, the hollow tube of the rod is provided with reinforcing ribs or reinforcing rings to improve the bending and torsional resistance of the rod. The reinforcing ribs are longitudinal protrusions along the inside or outside of the rod, and the reinforcing rings are annular metal or plastic parts that are fitted onto the outside of the rod.

[0039] In another embodiment, the stick surface is designed with an anti-slip texture or coating to facilitate user grip and operation, preventing the selfie stick from falling due to slippage during use. The anti-slip texture can be various shaped raised patterns, such as diamonds or waves, while the coating is usually made of rubber paint or other materials with anti-slip properties.

[0040] A rotating gimbal is provided at the top of the rod body. The second positioning gear is fixedly mounted on the plane of the rotating gimbal. A remote control device is rotatably connected to the side end of the rotating gimbal. The single-section hollow tube at the bottom of the rod body is housed in the support base. The support base is sleeved on the outside of the main rod 1 at the bottom of the rod body through a sliding part 4. The support base includes the main rod 1, a bracket 2, a connecting rod 3, a sliding part 4, and a fixing part 5. The sliding part 4 is sleeved on the main rod 1 and slides up and down along the main rod 1. The sliding part 4 is rotatably connected to the upper end of the inner shell 21 of the bracket 2 through a rotating shaft hole at its upper end. The lower half of the inner shell 21 has a through hole for the end of the connecting rod 3 with the rotating shaft part 31 to pass through. The outside of the through hole has a shaft groove 211 and a slot wall. The rotating shaft part 31 includes a first rotating shaft 311 and a second rotating shaft 312. The first rotating shaft 311 is rotatably connected to the shaft groove 211. An elastic element 6 is sleeved on the second rotating shaft 312. As a torsion spring, the elastic element 6 has a spring body 61 and a spring arm 62. The spring arm 62 includes a first spring arm 621 with an inverted U-shaped support and a second spring arm 622 with two legs. The first spring arm 621 and the second spring arm 622 are respectively disposed at both ends of the spring body 61. The first spring arm 621 abuts against the groove wall on the inner shell 21, and the second spring arm 622 abuts against the outer shell 22 of the bracket 2. The spring body 61 has a corresponding second spring arm 622 with two legs. The spring consists of two parts, left and right. The second rotating shaft 312 includes a short rotating shaft that mates with the two parts, and there is an assembly space between the short rotating shafts. The fixing part 5 is located at the lower end of the main rod 1. The other end of the connecting rod 3 has a third rotating shaft 32 that is rotatably connected to the fixing part 5 through the engagement of the rotating shaft and the shaft hole. The side end of the outer shell 22 has a slot 221, and the side end of the inner shell 21 is inserted into the slot 221 to achieve the combined assembly of the inner shell 21 and the outer shell 22.

[0041] The bottom end of the main rod 1 is provided with a hanging slot button 7. The center of the hanging slot button 7 is fixedly connected to the center of the fixing part 5 by screws. A small return spring is provided between the hanging slot button 7 and the fixing part 5. The small return spring is sleeved on the outside of the center of the hanging slot button 7 and the fixing part 5. A hanging ring 71 is provided around the hanging slot button 7. The bottom end of the bracket 2 has a buckle 23. When the support base is closed, the buckle 23 is engaged with the hanging ring 71, so that the support base is closed into a cylindrical shape. The bracket 2 consists of three equal arc-shaped structural parts. When the bracket 2 is closed, it is a cylinder. Each arc-shaped structure is equipped with a connecting rod and a torsion spring. The elastic potential energy is stored and converted through the loading and unloading of the torsion spring, realizing the semi-automatic opening and closing of the bracket.

[0042] The above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments, and many similar modifications are possible. All variations that can be directly derived or conceived by those skilled in the art from the content disclosed in this utility model should be considered within the scope of protection of this utility model.

Claims

1. A simple opening and closing support base based on a torsion spring structure, characterized by, The support base includes a main rod (1), a bracket (2), a connecting rod (3), a sliding part (4), and a fixing part (5). The sliding part (4) is sleeved on the main rod (1) and slides up and down along the main rod (1). The fixing part (5) is located at the lower end of the main rod (1). One end of the connecting rod (3) is rotatably connected to the fixing part (5). The other end of the connecting rod (3) is provided with a rotating shaft (31). The rotating shaft (31) includes a first rotating shaft (311) and a second rotating shaft (312). The first rotating shaft (311) The second rotating shaft (312) is rotated in conjunction with the shaft groove (211) on the inner shell (21) of the bracket (2). An elastic element (6) is sleeved on the second rotating shaft (312). The elastic element (6) has a spring body (61) and a spring arm (62). The spring arm (62) includes a first spring arm (621) and a second spring arm (622), which are respectively disposed at both ends of the spring body (61). The first spring arm (621) abuts against the groove wall on the inner shell (21), and the second spring arm (622) abuts against the outer shell (22) of the bracket (2).

2. The easy open and close support base based on torsion spring structure according to claim 1, characterized in that, The rotating shaft (31) passes through the through hole on the inner shell (21), and the shaft groove (211) is provided on the outside of the inner shell (21).

3. The easy open and close support base based on torsion spring structure according to claim 1, characterized in that, The outer shell (22) has a slot (221) on its side, and the side of the inner shell (21) is inserted into the slot (221) to realize the combined assembly of the inner shell (21) and the outer shell (22).

4. The easy open and close support base based on torsion spring structure according to claim 1, characterized in that, One end of the connecting rod (3) has a third rotating shaft (32) which is rotatably connected to the fixing part (5) through the cooperation of the rotating shaft and the shaft hole.

5. The easily opening and closing support base based on a torsion spring structure as described in claim 1, characterized in that, The bottom end of the main rod (1) is provided with a hanging groove button (7), and the center of the hanging groove button (7) is fixedly connected to the center of the fixing part (5) by screws.

6. The easy open and close support base based on torsion spring structure according to claim 5, characterized in that, A small return spring is provided between the hanging slot button (7) and the fixing part (5), and the small return spring is sleeved on the outside of the center part of the hanging slot button (7) and the fixing part (5).

7. The easy open and close support base based on torsion spring structure according to claim 6, characterized in that, The hanging slot button (7) is surrounded by a hanging ring (71), and the bottom end of the bracket (2) has a buckle (23). When the support base is closed, the buckle (23) engages with the hanging ring (71), so that the support base is closed into a column shape.

8. The easy open and close support base based on torsion spring structure according to claim 1, characterized in that, The elastic element (6) is a torsion spring, and the first spring arm (621) and the second spring arm (622) are two independent support arms.

9. The easy open and close support base based on torsion spring structure according to claim 1, characterized in that, The elastic element (6) is a torsion spring, and the first spring arm (621) is an inverted U-shaped support arm. The horizontal arm of the inverted U-shaped support arm abuts against the groove wall on the inner shell (21).

10. The easy open and close support base based on torsion spring structure according to claim 9, characterized in that, The spring body (61) has two parts, left and right, and the second rotating shaft (312) has a short rotating shaft that cooperates with the two parts of the spring body, and there is an assembly space between the short rotating shafts.

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