Protective case and handheld device

Abstract

The present invention relates to the field of cable protection, and provides a protective sleeve for bending protection of wires of a handheld device, comprising: a flexible protective sleeve having a channel for the wire to pass through inside; a connecting portion provided at at least one end of the protective sleeve, and the connecting portion can be inserted into the housing of the handheld device and fixedly connected to the handheld device; the protective sleeve has a root portion of the connecting portion, and at the inner wall of the channel at the root portion, a radially inward annular protrusion is formed. The protective sleeve has a high bending life, can protect the wire of the handheld device from bending, and at the same time can control the breakage spark to prevent the spark from escaping, thereby improving the safety of the handheld device during use.

Description

Technical Field

[0001] The invention relates to the field of cable protection, in particular to a protective cover for bending protection of electric wires of handheld devices. Background Art

[0002] With the development of science and technology, people use handheld devices more and more frequently, and their requirements are getting higher and higher. As an example of a handheld device, a hair dryer with a wire is widely used. In the actual use of a hair dryer, the wires used with it often move with the movement of the hair dryer's air cylinder, and they may bend or break as the frequency of use increases. On the one hand, the constant bending of the wires during use often results in their service life being unsatisfactory; on the other hand, the damage of the wires will also cause the conductive parts inside the wires to be exposed, and even produce sparks from broken wires, posing a huge safety hazard.

[0003] In order to extend the service life of the hair dryer wire, a protective cover is generally provided for the wire, which can provide a certain degree of protection for the wire and improve the service life and safety performance of the wire during long-term use. However, the existing hair dryer wire protective cover cannot provide good protection for the wire. For example, under a load of 10N, 180 ° In the wire bending test, when the number of bends exceeds 6,000, the wire protective cover will be damaged, causing the wire to be disconnected. Therefore, it is urgent to further improve the wire protective cover to meet the bending strength and bending frequency requirements of the wire protective cover during repeated use, and improve the safety performance of the wire during long-term use. Summary of the invention

[0004] In view of the above problems, the present invention provides a protective cover which can protect the wires of a handheld device from bending and can control sparks caused by broken wires to prevent sparks from escaping, thereby improving the safety performance of the handheld device during use.

[0005] The protective cover provided by the present invention is used for bending protection of the electric wires of a handheld device, and comprises: a flexible protective cover tube, the interior of which is provided with a channel for the power line to pass through; a connecting portion, which is arranged at at least one end of the protective cover tube, and the connecting portion can be inserted into the shell of the handheld device and fixedly connected to the handheld device; the protective cover tube has a root portion connected to the connecting portion, and an annular protrusion radially inward is formed on the inner wall of the channel of the root portion.

[0006] According to this technical solution, for the protective sleeve provided by the present invention, first, by threading an electric wire into the channel of a flexible protective sleeve, the electric wire has a protective layer, preventing the electric wire from being exposed and providing primary protection for the electric wire; second, the connecting part at at least one end of the protective sleeve is inserted into the housing of the handheld device and fixedly connected to the handheld device, preventing the electric wire from loosening or falling off during use; finally, the protective sleeve has a root connecting the connecting part, and a radially inward annular protrusion is formed on the inner wall of the channel at the root. After the bending frequency of the electric wire in actual use reaches the bending life, the annular protrusion can define the cross-section position, and can control the broken wire spark at the moment of wire breakage from escaping to the outside of the handheld device body, providing ultimate protection for the electric wire, thereby improving the safety factor of the electric wire supporting the handheld device during use and avoiding potential safety hazards.

[0007] In a preferred technical solution of the present invention, the protective sleeve further includes a hook part extending radially outward from the outer wall of the root, and the end face of the hook part axially away from the connecting part is flush with the axial position of the annular protrusion.

[0008] According to this preferred technical solution, the hook part extending radially outward from the outer wall of the root is flush with the axial position of the annular protrusion, further increasing the bending resistance of the root, thereby further defining the cross-section position, and even further defining the cross-section position at the bottom of the hook, more securely preventing the broken wire spark from escaping.

[0009] In a preferred technical solution of the present invention, the protective sleeve has a free part connected to the root and bendable relative to the root, and the wall thickness of the free part is less than that of the root.

[0010] According to this preferred technical solution, the wall thickness of the free part connected to the root and bendable relative to the root is less than that of the root, that is, the wall thickness of the root is greater than that of the free part, which can improve the root's ability to withstand bending.

[0011] More preferably, the outer surfaces of both the free part and the root are formed with concave-convex structures surrounding the protective sleeve.

[0012] According to this technical solution, the concave-convex structures formed on the outer surfaces of the free part and the root surrounding the protective sleeve can limit the bending amplitude of the electric wire, preventing the electric wire from being irreversibly damaged due to excessive bending.

[0013] More preferably, the distance between adjacent protruding parts of the concave-convex structure is 0.75 - 2.00 mm.

[0014] According to this technical solution, the distance between adjacent protruding parts of the concave-convex structure is set to 0.75 - 2.00 mm, and the distance within this range can ensure the bending angle of the protective sleeve while also meeting the manufacturing requirements in actual production.

[0015] Preferably, the wall thickness of the free portion at the concave part of the concave-convex structure is 0.5 to 1.6 mm.

[0016] According to this technical solution, the wall thickness range of the free portion at the concave part of the concave-convex structure is set to 0.5 to 1.6 mm. The wall thickness within this range can ensure that the protective sleeve can be effectively bent and prevent the broken wire spark from piercing through the sleeve.

[0017] In a preferred technical solution of the present invention, the outer edge contour dimension of the cross-section of the root portion gradually decreases along the axial direction from the connecting portion to the free portion.

[0018] According to this preferred technical solution, since the handheld device often rotates and moves translationally during use, the part closer to the handheld device is more likely to be bent more frequently. By setting the root portion to a gradually changing shape, the bending amplitude of the power cord at the root portion can be limited. The bending amplitude is smaller at the position closer to the handheld device, that is, the part with a higher bending frequency, so as to avoid the bending stress being too concentrated at a specific position.

[0019] In a preferred technical solution of the present invention, the outer surface of the root portion has a plurality of first reinforcing ribs extending along the axial direction.

[0020] According to this preferred technical solution, setting a plurality of first reinforcing ribs extending along the axial direction on the outer surface of the root portion can effectively limit the bending amplitude of the wire at the root portion and improve the bending life of the wire.

[0021] In a preferred technical solution of the present invention, the connecting portion has a chuck at the outermost end of the connecting portion and a necking section between the chuck and the root portion. The outer edge of the necking section is provided with a second reinforcing rib extending along the axial direction.

[0022] According to this preferred technical solution, the second reinforcing rib is provided on the connecting portion to strengthen the connection of the connecting portion so that it is not easily disengaged.

[0023] In a preferred technical solution of the present invention, the cross-section of the channel is a rounded rectangle, and there are four second reinforcing ribs. The installation positions of the four second reinforcing ribs respectively correspond to the centers of the four sides of the rounded rectangle.

[0024] According to this preferred technical solution, by providing four second reinforcing ribs at the centers of the four sides corresponding to the rounded rectangle, the positions of the protective sleeve and the body can be positioned by the limitation of the second reinforcing ribs in four directions.

[0025] In a preferred technical solution of the present invention, the cross-sectional shape of the channel matches the cross-sectional shape of the wire.

[0026] According to this preferred technical solution, the cross-sectional shape of the channel matches the cross-sectional shape of the wire, ensuring that the shape of the channel inside the protective sleeve is similar to that of the wire, preventing the wire from wobbling in the protective sleeve due to an overly large diameter of the protective sleeve channel or making it difficult to insert the wire into the channel due to an overly small diameter, improving the matching degree between the protective sleeve and the wire, and thereby enhancing the strength of the protective sleeve.

[0027] In the preferred technical solution of the present invention, the annular protrusion has a first edge close to the connecting portion and a second edge far from the connecting portion along the axial direction. The extending directions of the first edge and the second edge are both inclined to the axial direction, and the angles formed by the first edge and the second edge with the radial plane are 45° - 80°.

[0028] According to this preferred technical solution, the design of the protrusion slope where the extending directions of the first edge close to the connecting portion and the second edge far from the connecting portion are inclined to the axial direction and form an angle of 45° - 80° with the radial plane enables the broken wire sparks to bounce off the protrusion slope when the wire breaks, rather than shooting out of the body downward, improving the safety performance of the protective sleeve.

[0029] In the preferred technical solution of the present invention, the clearance distance between the top of the annular protrusion and the wire is 0.2 - 1 mm.

[0030] According to this preferred technical solution, setting an appropriate clearance distance between the top of the annular protrusion and the wire can, on the one hand, prevent broken wire sparks from falling through the gap between the wire and the protective sleeve and causing safety accidents, and on the other hand, prevent the wire from swinging excessively in the protective sleeve and control the amplitude of the wire swing.

[0031] The present invention also provides a handheld device having the protective sleeve described in any of the above technical solutions. According to the handheld device of the present invention, the technical effects of any of the above technical solutions can naturally be obtained. Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of the protective sleeve in an embodiment of the present invention;

[0033] Figure 2 is a front view cross-sectional view of the structure of the protective sleeve in an embodiment of the present invention;

[0034] Figure 3 is a partial enlarged cross-sectional view of part E of the protective sleeve in an embodiment of the present invention;

[0035] Figure 4 is a cross-sectional view of the channel inside the protective sleeve and the cross-section of the wire in an embodiment of the present invention.

[0036] Reference Signs:

[0037] 1 - protective sleeve; 2 - electric wire; 3 - break spark; 10 - protective tube; 100 - channel; 101 - root; 1010 - annular protrusion; 10100 - first edge; 10101 - second edge; 1011 - first reinforcing rib; 102 - free part; 103 - concave-convex structure; 11 - connecting part; 110 - chuck; 111 - necking section; 112 - second reinforcing rib; 12 - hook part; A - channel cross-section; B - electric wire cross-section; a - spacing between adjacent protruding parts of the concave-convex structure; b - wall thickness of the recessed part of the concave-convex structure; c - spacing between the top of the annular protrusion and the electric wire; d - angle formed by the first edge, the second edge and the radial plane. Detailed implementation manners

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] In the description of the present application, it should be understood that the terms "axial direction", "radial direction", "thickness", "angle", "surface", "adjacent", "recessed", "protruding", "upper", "lower", "inner", "outer", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically defined.

[0041] In the present application, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0042] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0043] Figure 1 It is a schematic structural diagram of the protective sleeve 1 in the embodiment of the present invention.

[0044] Reference Figure 1 , the protective sleeve 1 provided in this embodiment includes: a protective tube 10 and a connecting portion 11. Inside the protective tube 10, there is a channel 100 for the power supply wire 2 to penetrate. The protective tube 10 has a root portion 101 connected to the connecting portion 11. At the inner wall of the channel 100 of the root portion 101, a radially inward annular protrusion 1010 is formed (see the following Figure 2 ). The radial direction here refers to the radial direction in an approximately circular cross-section obtained by being orthogonal to the length direction of the protective tube 10.

[0045] Specifically, the protective tube 10 in this embodiment is flexible and can be deformed or bent. During use, the wire 2 may be damaged due to external forces. Therefore, the flexible protective tube 10 can buffer a part of the external force for the wire 2 inside the protective tube 10 and improve the service life of the wire 2; the channel 100 for the power supply wire 2 to penetrate inside the protective tube 10 can allow the wire 2 connected to a handheld device (not shown) to penetrate and wrap it inside, forming a protective layer for the wire 2 and extending the service life of the wire 2; since the wire 2 must be connected to the handheld device to transmit current to the handheld device, and the connection between the wire 2 and the handheld device is extremely prone to loosening or falling off, the connecting portion 11 provided at at least one end of the protective tube 10 assembles the protective sleeve 1 and the handheld device together. After the connecting portion 11 is inserted into the housing of the handheld device (not shown) and fixedly connected to the handheld device, the connection between the wire 2 and the handheld device is equivalent to having the protection of the protective sleeve 1 and an additional layer of protection by the housing of the handheld device, forming a double protection mechanism and improving the safety performance of the wire 2; since the service life of the wire 2 is limited, especially when the wire 2 is frequently bent during use with the handheld device, the wire is often broken. When the wire breaks, the broken wire spark 3 is likely to escape outside the handheld device body and pose a safety hazard. The radially inward annular protrusion 1010 formed at the inner wall of the channel 100 of the root portion 101 connected to the connecting portion 11 blocks the broken wire spark 3 by using the shape of the protrusion in the presence of the broken wire spark 3. Thus, even when the wire 2 reaches its bending life and breaks, the broken wire spark 3 can be controlled, and the broken wire spark 3 is prevented from escaping outside the handheld device body and endangering the safety of the user. Therefore, compared with the traditional protective sleeve 1 that only forms a protective layer for the wire 2, the protective sleeve 1 in this embodiment not only improves the bending life of the wire 2 under normal use conditions but also provides ultimate protection for the wire 2 after reaching its bending life. This protective sleeve 1 greatly improves the safety performance of the wire 2.

[0046] In this embodiment, the protective sleeve 10 is made of a flexible material or a flexible material with elasticity. The deformation performance of the protective sleeve 10 made of the flexible material can buffer a part of the impact of external forces for the electric wire 2.

[0047] In this embodiment, the connecting portion 11 is fixedly connected to the handheld device. The fixed connection method can be a threaded connection. The threaded connection has a simple structure, reliable connection, and is also detachable, making it easy to operate when the connection between the electric wire 2 and the handheld device becomes loose or falls off. In other embodiments of the present invention, the fixed connection method between the connecting portion 11 and the handheld device can also be welding or bonding, etc. In this embodiment, the handheld device is a hair dryer, but it is not limited thereto. The technical solution of the present invention can be applied to all handheld devices with an electric wire 2. For example, the handheld device can be an electric hair straightener, a hair curler, and other devices.

[0048] Figure 2 is the front view of the structure of the protective sleeve 1 in the embodiment of the present invention. Refer to Figure 1 and Figure 2 , preferably, the protective sleeve 1 further includes a hook portion 12 extending radially outward from the outer wall of the root portion 101. The end face of the hook portion 12 axially away from the connecting portion 11 is flush with the axial position of the annular protrusion 1010. The axial direction here refers to the length direction of the long strip-shaped protective sleeve 10.

[0049] In this embodiment, the end face of the bottom of the hook portion 12 axially away from the connecting portion 11 is connected to the root portion 101 and is flush with the axial position of the annular protrusion 1010. Further, the bending nodes during the use of the electric wire 2 are controlled, the cross-sectional position of the electric wire 2 is defined, and the disconnection node of the electric wire 2 is controlled above the annular protrusion 1010, or even directly the disconnection node is controlled at the bottom of the hook portion 12, which can prevent the disconnection spark 3 from escaping outside the handheld device body and thus avoid the occurrence of safety accidents, improving the safety factor during the use of the electric wire 2.

[0050] In this embodiment, the material of the hook portion 12 can be polyvinyl chloride. Polyvinyl chloride not only has good tensile, bending, and impact resistance capabilities, but also has good electrical insulation performance and flame retardancy, further reducing the influence of the disconnection spark 3 escaping outside the handheld device body.

[0051] Refer to Figure 1 and Figure 2 , preferably, the protective sleeve 10 has a free portion 102 connected to the root portion 101 and capable of being bent relative to the root portion 101. The wall thickness of the free portion 102 is smaller than that of the root portion 101.

[0052] In this embodiment, the free portion 102 connected to the root portion 101 and bent relative to the root portion 101 enables the protective sleeve 1 to bend slightly along with the wire 2 well when the wire 2 needs to be bent during the actual use of the handheld device, ensuring that the wire 2 can still be well protected when the wire 2 needs to be bent. The wall thickness of the free portion 102 connected to the root portion 101 and bendable relative to the root portion 101 is smaller than that of the root portion 101, that is, the wall thickness of the root portion 101 is greater than that of the free portion 102, which can improve the bending resistance of the root portion 101. Because when the wire 2 is bent during actual use, the bending force on the root portion 101 is the largest and the frequency is the highest, improving the bending resistance of the root portion 101 can extend the bending life of the wire 2.

[0053] Reference Figure 1 and Figure 2 , preferably, the outer surfaces of both the free portion 102 and the root portion 101 are formed with the concave-convex structure 103 surrounding the protective sleeve 10.

[0054] In this embodiment, the concave-convex structure 103 surrounding the protective sleeve 10 formed on the outer surfaces of the free portion 102 and the root portion 101 can limit the bending amplitude of the wire 2 and enhance the strength of the outer surfaces of the free portion 102 and the root portion 101, preventing the wire 2 from being irreversibly damaged due to excessive bending.

[0055] Figure 3 is a partial cross-sectional view of the protective sleeve 1 in the embodiment of the present invention. Reference Figure 3 , preferably, the distance a between adjacent protruding portions of the concave-convex structure 103 is 0.75 - 2.00 mm.

[0056] In this embodiment, the distance a between adjacent protruding portions of the concave-convex structure 103 is set to 0.75 - 2.00 mm, more preferably 1.0 mm. The distance within this range can ensure the bending angle of the protective sleeve 1 while also meeting the manufacturing requirements in actual production. If it is too large, it may cause the wire 2 to have too large a bending angle and be difficult to recover; if it is too small, it may lead to an increase in manufacturing cost and an increase in process difficulty in actual production.

[0057] Reference Figure 3 , preferably, the wall thickness b of the free portion 102 in the recessed portion of the concave-convex structure 103 is 0.5 - 1.6 mm.

[0058] In this embodiment, the wall thickness range b of the free portion 102 in the recessed portion of the concavo-convex structure 103 is set to 0.5 to 1.6 mm, more preferably 0.75 mm. The wall thickness within this range can ensure that the protective sleeve 1 can be effectively bent and can prevent the disconnection spark 3 from piercing through the protective sleeve 1. If the wall thickness b of the free portion 102 in the recessed portion of the concavo-convex structure 103 is too large, the hardness of this part will be too large and it cannot be effectively bent. When it is too thin, the disconnection spark 3 may pierce through the protective sleeve 1, bringing potential safety hazards.

[0059] Reference Figure 1 and Figure 2 , preferably, the outer edge contour dimension of the cross-section of the root portion 101 gradually decreases along the axial direction from the connecting portion 11 to the free portion 102.

[0060] In this embodiment, since the handheld device often rotates and moves translationally during use, the part closer to the handheld device is more likely to be bent more frequently. By setting the root portion 101 to a tapered shape, the bending amplitude of the power cord of the root portion 101 can be limited. The closer to the handheld device, that is, the part with a higher bending frequency, the smaller the bending amplitude, so as to avoid the bending stress being too concentrated at a specific position, resulting in the wire 2 breaking, and improving the bending life of the wire 2.

[0061] Reference Figure 1 and Figure 2 , preferably, the outer surface of the root portion 101 has a plurality of first reinforcing ribs 1011 extending along the axial direction.

[0062] In this embodiment, the plurality of first reinforcing ribs 1011 extending along the axial direction provided on the outer surface of the root portion 101 can increase the strength and stiffness of the root portion 101 without increasing the wall thickness, and can also prevent the root portion 101 from deforming due to residual stress. It can effectively limit the bending amplitude of the wire 2 in the root portion 101 and improve the bending life of the wire 2. At the same time, by providing a plurality of first reinforcing ribs 1011 extending along the axial direction on the root portion 101 and increasing the number of the first reinforcing ribs 1011, the stress generated in the root portion 101 can be prevented from being overly concentrated.

[0063] In this embodiment, the connection between the first reinforcing rib 1011 and the wall thickness of the root portion 101 should adopt an arc transition, and the thickness of the first reinforcing rib 1011 should not be greater than the wall thickness of the root portion 101. Reasonable control of the number and height of the first reinforcing ribs 1011 can ensure that the effect of the first reinforcing ribs 1011 in improving the strength and stiffness of the root portion 101 reaches the best.

[0064] Reference Figure 1 and Figure 2, preferably, the connecting portion 11 has a chuck 110 at the outermost end of the connecting portion 11 and a necking section 111 between the chuck 110 and the root portion 101. A second reinforcing rib 112 extending in the axial direction is provided on the outer edge of the necking section 111.

[0065] In this embodiment, since the chuck 110 is to be sleeved on the housing of the handheld device, the necking section 111 is formed in a matching manner with the chuck 110. Generally, after the stress reaches the strength limit, plastic deformation begins to occur at the weakest part of the necking section 111 between the chuck 110 and the root portion 101, resulting in a sharp necking of the local cross-section of the necking section 111, a rapid reduction in the bearing area, and a rapid drop in the load borne by the necking section 111 until it breaks. By providing the second reinforcing rib 112 on the connecting portion 11, the connection of the connecting portion 11 can be strengthened, and it is not easily disengaged when the necking section 111 breaks.

[0066] More preferably, the cross-section A of the channel 100 inside the protective sleeve 10 is a rounded rectangle, and there are four second reinforcing ribs 112. The arrangement positions of the four second reinforcing ribs 112 respectively correspond to the centers of the four sides of the rounded rectangle. In the present invention, it is preferred that there are four second reinforcing ribs, but the specific value of the number of ribs is not limited, and two or more than two are acceptable. When there are two second reinforcing ribs, the two second reinforcing ribs are arranged oppositely and their positions respectively correspond to the centers of two of the sides of the rounded rectangle.

[0067] In this embodiment, the cross-section A of the channel 100 inside the protective sleeve 10 is a rounded rectangle. The cross-section design of the rounded rectangle can prevent the wire 2 from being scratched when it is inserted into the channel 100. By providing four second reinforcing ribs 112 at the centers of the four sides corresponding to the rounded rectangle, it can be ensured that the forces borne by the connecting portion 11 in all directions are balanced, and the positions of the protective sleeve 1 and the body can be positioned by the limitation of the second reinforcing ribs 112 in four directions to avoid misaligned connection.

[0068] Figure 4 is a diagram of the cross-section A of the channel 100 inside the protective sleeve 10 and the cross-section B of the wire 2 in the embodiment of the present invention. Refer to Figure 4 , preferably, the shape of the cross-section A of the channel 100 matches the shape of the cross-section B of the wire 2.

[0069] In this embodiment, the shape of the cross-section A of the channel 100 matches the shape of the cross-section B of the wire 2, ensuring that the shape of the channel 100 inside the protective sleeve 10 is similar to the shape of the wire 2, preventing the diameter of the channel 100 inside the protective sleeve 10 from being too large, resulting in the wire 2 shaking inside the channel 100 of the protective sleeve 10, or being too small, resulting in the wire 2 being difficult to insert into the channel 100, and improving the strength of the protective sleeve 1.

[0070] In some embodiments of the present invention, the shape of the cross-section A of the inner channel 100 of the protective sleeve 10 and the shape of the cross-section B of the wire 2 can be circular. In other embodiments of the present invention, the shape of the cross-section A of the inner channel 100 of the protective sleeve 10 and the shape of the cross-section B of the wire 2 can also be oval, which can be determined according to the shape of the cross-section B of the wire 2 to be specifically protected. For example, if the shape of the cross-section B of the wire 2 to be protected is circular, the cross-section A of the channel 100 can adopt a circular cross-section. If the wire 2 to be protected is a flat wire 2, the cross-section A of the channel 100 can adopt an oval cross-section.

[0071] Reference Figure 3 , preferably, the annular protrusion 1010 has a first edge 10100 close to the connection part 11 and a second edge 10101 far from the connection part 11 along the axial direction. The extending directions of the first edge 10100 and the second edge 10101 are both inclined to the axial direction, and the included angle d between the first edge 10100, the second edge 10101 and the radial plane is 45° - 80°.

[0072] In this embodiment, the included angle d between the first edge 10100, the second edge 10101 and the radial plane is 45° - 80°, more preferably 62° - 72°. The extending directions of the first edge 10100 close to the connection part 11 and the second edge 10101 far from the connection part 11 are inclined to the axial direction, and the protrusion slope design with an angle of 45° - 80° with the radial plane enables the broken wire spark 3 to bounce back when hitting the protrusion slope during wire breakage, rather than shooting out of the body downward, thus improving the safety performance of the protective sleeve 1.

[0073] In some embodiments of the present invention, the protrusion slope design with an angle of 45° - 80° with the radial plane can be a symmetric design. In other embodiments of the present invention, the protrusion slope design with an angle of 45° - 80° with the radial plane can also be an asymmetric design. The protrusion slope design enables the broken wire spark 3 to bounce back towards the interior of the body when hitting the slope surface because the first edge 10100 and the second edge 10101 have a certain included angle with the radial plane, thus preventing the broken wire spark 3 from shooting out of the body and controlling the broken node of the wire 2 at the root 101 position, improving its safety performance.

[0074] Reference Figure 3 , preferably, the distance c between the top of the annular protrusion 1010 and the wire 2 is 0.2 - 1 mm.

[0075] In this embodiment, the gap distance c between the top of the annular protrusion 1010 and the wire 2 is 0.2 to 1 mm, more preferably 0.55 to 0.65 mm. Setting an appropriate gap distance between the top of the annular protrusion 1010 and the wire 2 can, on the one hand, prevent the disconnection spark 3 from falling through the gap between the wire 2 and the protective sleeve 1 and causing a safety accident, and on the other hand, prevent the wire 2 from swinging excessively in the protective sleeve 1 and control the amplitude of the wire 2 swing.

[0076] According to this embodiment of the present invention, under the wire 2 bending test conditions of 180° bending and a load of 10 N, the wire 2 is bent 10,000 times, and the disconnection rate is 0%. Similarly, under the same conditions, a bending test limit test is carried out on the wire 2 in this embodiment. The results show that the maximum bending life of the wire 2 reaches 30,335 times. Compared with the current wire 2 with a bending life of only 6,000 times under the same conditions, the bending life of the wire 2 has increased by 506%.

[0077] The protective sleeve 1 provided in this embodiment can control the disconnection spark 3 and prevent the spark from escaping by forming an annular protrusion 1010 radially inward on the inner wall of the channel 100 of the root 101, thereby improving the safety performance of the handheld device during use. At the same time, the outer surface of the root 101 and the outer edge of the necking section 111 of the connecting portion 11 are respectively provided with a first reinforcing rib 1011 and a second reinforcing rib 112, and the bending life of the wire 2 is improved by their reasonable arrangement. By controlling the angle, thickness, etc. during the design and manufacturing process of the protective sleeve 1, the safety factor and bending life of the wire 2 are greatly improved.

[0078] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A protective sleeve for protecting the bending of a wire of a handheld device, comprising: A flexible protective tube having a channel inside for the wire to penetrate; A connecting portion provided at at least one end of the protective tube, and the connecting portion can be inserted into the housing of the handheld device and fixedly connected to the handheld device; Characterized in that the protective tube has a root connected to the connecting portion, and a circumferential protrusion extending radially inward is formed at the inner wall of the channel at the root; The circumferential protrusion has a first edge close to the connecting portion and a second edge far from the connecting portion in the axial direction, and the extending directions of the first edge and the second edge are both inclined to the axial direction.

2. The protective cover according to claim 1, wherein The protective sleeve further includes a hook portion extending radially outward from the outer wall of the root, and the end surface of the hook portion far from the connecting portion in the axial direction is flush with the axial position of the circumferential protrusion.

3. The protective case according to claim 1 or 2, characterized in that, The protective tube has a free portion connected to the root and bendable relative to the root, and the wall thickness of the free portion is smaller than that of the root.

4. The protective cover according to claim 3, wherein The outer surface of the free portion and the outer surface of the root are both formed with a concavo-convex structure surrounding the protective tube.

5. The protective cover according to claim 4, wherein The distance between adjacent convex portions of the concavo-convex structure is 0.75 to 2.00 mm, and the wall thickness of the free portion at the recessed portion of the concavo-convex structure is 0.5 to 1.6 mm.

6. The protective cover according to claim 3, characterized in that, The outer edge contour size of the cross section of the root gradually decreases along the axial direction from the connecting portion to the free portion.

7. The protective cover according to claim 1 or 4, characterized in that, The outer surface of the root has a plurality of first reinforcing ribs extending in the axial direction.

8. The protective cover according to any one of claims 1 to 2, 4 to 5, characterized in that, The connecting portion has: A chuck located at the outermost end of the connecting portion; A necking section located between the chuck and the root, and a second reinforcing rib extending in the axial direction is provided on the outer edge of the necking section.

9. The protective cover according to claim 8, characterized in that, The cross section of the channel is a rounded rectangle, there are four second reinforcing ribs, and the positions of the four second reinforcing ribs respectively correspond to the centers of the four sides of the rounded rectangle, and the cross section shape of the channel matches the cross section shape of the wire.

10. A handheld device, characterized in that, A protective sleeve as described in any one of claims 1-9.

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