CN215069332U - Protective sheath and handheld device - Google Patents

Abstract

The utility model relates to a cable protection field provides a protective sheath of the protection of buckling of electric wire for handheld device, include: the flexible protective sleeve is internally provided with a channel for the power supply line to penetrate; the connecting part is arranged at least one end part of the protective sleeve and can be inserted into the shell of the handheld equipment and fixedly connected with the handheld equipment; the sheath pipe is provided with a root part connected with the connecting part, and an annular bulge which is inwards along the radial direction is formed on the inner wall of the channel of the root part. This protective sheath bending life is high, can buckle the protection to handheld device's electric wire, can control the broken string spark simultaneously, prevents that the spark from scurrying out, has improved the security of handheld device in the use.

Description

Protective sheath and handheld device

Technical Field

The utility model relates to a cable protection field specifically is a protective sheath of buckling protection for handheld device's electric wire.

Background

With the development of science and technology, people use handheld devices more and more frequently, and the requirements are higher and higher. As an example of the handheld device, a hair dryer with an electric cord is widely used. In the actual use process of the hair drier, the electric wire matched with the hair drier is often linked with the movement of the air duct of the hair drier, and the situation of bending or damage and the like can occur along with the increase of the use frequency. On one hand, the service life of the wire is often unsatisfactory due to continuous bending of the wire in the use process; on the other hand, the wire breakage can also lead to the fact that the conducting part in the wire is exposed outside, even the wire breaking spark is generated, and huge potential safety hazards exist.

In order to prolong the service life of the electric wire of the hair dryer, a protective sleeve is generally arranged on the electric wire, so that the electric wire can be protected to a certain extent, and the service life and the safety performance of the electric wire in the long-term use process are improved. The existing protective sleeve for the electric wire of the hair dryer can not well protect the electric wire, for example, under the 10N load, 180 DEG^°When the number of bending times exceeds 6000 in the wire bending test, the wire protective sheath is damaged, and the wire is also broken. Therefore, there is a need for further improvement of the protective sheath of the electric wire to meet the requirements of bending strength and bending frequency during the repeated use of the protective sheath of the electric wire, and to improve the safety performance of the electric wire during the long-term use.

SUMMERY OF THE UTILITY MODEL

To the problem, the utility model provides a protective sheath can buckle the protection to handheld device's electric wire, can control the broken string spark simultaneously, prevents that the spark from scurrying out, has improved the security performance of handheld device in the use.

The utility model provides a protective sheath for the protection of buckling of handheld device's electric wire, include: the flexible protective sleeve is internally provided with a channel for the power supply line to penetrate; the connecting part is arranged at least one end part of the protective sleeve and can be inserted into the shell of the handheld equipment and fixedly connected with the handheld equipment; the sheath pipe is provided with a root part connected with the connecting part, and an annular bulge which is inward along the radial direction is formed on the inner wall of the channel of the root part.

According to the technical scheme, the protective sleeve provided by the utility model has the advantages that firstly, the electric wire is provided with the protective layer by penetrating the electric wire into the channel of the flexible protective sleeve, so that the electric wire is prevented from being exposed outside and forms primary protection for the electric wire; secondly, the connecting part at least one end part of the protective sleeve is inserted into the shell of the handheld equipment and is fixedly connected with the handheld equipment, so that the electric wire is prevented from loosening or falling off in the using process; finally, the protective sleeve is provided with a root part connected with the connecting part, an annular bulge which is inward along the radial direction is formed on the inner wall of the channel of the root part, the annular bulge can limit the position of a section after the bending frequency of the electric wire in actual use reaches the bending service life, and the instantaneous disconnection spark of the electric wire can be controlled not to jump to the outside of the handheld device body, so that the electric wire is finally protected, the safety factor of the electric wire matched with the handheld device in the use process is improved, and potential safety hazards are avoided.

The utility model discloses an among the preferred technical scheme, the protective sheath still includes from the outer wall of root, along the couple portion that radially outwards stretches out, the terminal surface of connecting portion is kept away from to the axial of couple portion, and the mutual parallel and level of annular convex axial position.

According to the preferred technical scheme, the hook part extending outwards along the radial direction from the outer wall of the root part is flush with the annular convex axial position, so that the bending resistance of the root part is further increased, the position of the section can be further limited at the bottom of the hook, and the wire breakage spark is more reliably prevented from jumping out.

The utility model discloses an among the preferred technical scheme, the protective sheath has and is connected and can be for the free portion that the root was buckled with the root, and the wall thickness of free portion is less than the root.

According to the preferred technical scheme, the thickness of the tube wall of the free part which is connected with the root part and can be bent relative to the root part is smaller than that of the root part, namely, the thickness of the tube wall of the root part is larger than that of the free part, so that the bending resistance of the root part can be improved.

Preferably, the outer surface of the free portion and the outer surface of the root portion are both formed with a concave-convex structure surrounding the sheath tube.

According to the technical scheme, the bending amplitude of the electric wire can be limited by the concave-convex structure which is formed by the outer surface of the free part and the outer surface of the root part and surrounds the protective sleeve, and the electric wire is prevented from being damaged by being bent excessively and cannot be recovered.

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

According to the technical scheme, the distance between the adjacent convex parts of the concave-convex structure is set to be 0.75-2.00 mm, and the distance in the range can ensure the bending angle of the protective sleeve and simultaneously meet the manufacturing requirement in actual production.

More preferably, the thickness of the tube wall of the free part at the concave part of the concave-convex structure is 0.5-1.6 mm.

According to the technical scheme, the thickness range of the tube wall of the free part in the concave part of the concave-convex structure is set to be 0.5-1.6 mm, the tube wall thickness in the range can ensure that the protective sleeve can be effectively bent, and the protective sleeve can be prevented from being broken by a broken wire spark.

The utility model discloses an among the preferred technical scheme, the outer fringe profile size of the cross section of root reduces along the axial direction from connecting portion to free portion gradually.

According to the preferred technical scheme, the handheld device can rotate and translate frequently in the using process, the part closer to the handheld device is easier to bend at a higher frequency, and the bending amplitude of the power line at the root part can be limited by arranging the root part into a gradually-changed shape. The bending amplitude of the part which is closer to the handheld device, namely the part with higher bending frequency is smaller, so that the bending stress is prevented from being excessively concentrated on a specific position.

The utility model discloses an among the preferred technical scheme, the surface of root has many first strengthening ribs that extend along axial direction.

According to this preferred technical scheme, the root surface sets up many first strengthening ribs that extend along axial direction can effectively restrict the bending range of root electric wire, improves the electric wire bending life-span.

The utility model discloses an among the preferred technical scheme, connecting portion have the chuck that is located connecting portion outermost end and the necking down section that is located between chuck and the root, and the outer fringe of necking down section is provided with the second strengthening rib that extends along the axial direction.

According to this preferred technical scheme, connecting portion set up the second strengthening rib for strengthen connecting portion and connect and make it be difficult for deviating from.

The utility model discloses an among the preferred technical scheme, the transversal fillet rectangle of personally submitting of passageway, the second strengthening rib has four, and the position that sets up of four second strengthening ribs corresponds the central authorities on four limits of fillet rectangle respectively.

According to the better technical scheme, four second reinforcing ribs are arranged in the centers of the four sides of the corresponding round rectangle, and the positions of the protective sleeve and the body can be positioned by limiting the second reinforcing ribs in four directions.

In the preferred technical solution of the present invention, the cross-sectional shape of the channel is matched with the cross-sectional shape of the wire.

According to this better technical scheme, the cross sectional shape of passageway matches each other with the cross sectional shape of electric wire, ensures that the shape of the inside passageway of protective sheath pipe is imitative with the shape of electric wire, prevents that protective sheath passageway diameter from too big leading to the electric wire to appear rocking in the protective sheath, perhaps the undersize leads to the electric wire to be difficult for penetrating this passageway, improves the matching degree of protective sheath and electric wire, and then improves the intensity of protective sheath.

The utility model discloses an among the preferred technical scheme, cyclic annular protrusion has the first edge that is close to connecting portion and keeps away from the second edge of connecting portion along axial direction, and the extending direction at first edge, second edge all inclines to axial direction, and the contained angle that first edge, second edge and radial plane are is 45 ~ 80.

According to the preferred technical scheme, the extending directions of the first edge close to the connecting part and the second edge far away from the connecting part are inclined to the axial direction, and the projecting slope design with an angle of 45-80 degrees with the radial plane is adopted, so that when the electric wire is disconnected, the broken wire sparks bounce on the projecting slope, and cannot jump out of the body downwards, and the safety performance of the protective sleeve is improved.

The utility model discloses an among the preferred technical scheme, the clearance distance between cyclic annular convex top and the electric wire is 0.2 ~ 1 mm.

According to the better technical scheme, the proper gap distance is arranged between the top of the annular protrusion and the electric wire, so that on one hand, safety accidents caused by falling of wire breaking sparks from the gap between the electric wire and the protective sleeve can be prevented, on the other hand, the electric wire can be prevented from excessively swinging in the protective sleeve, and the swinging amplitude of the electric wire is controlled.

The utility model also provides a handheld device, have as above arbitrary technical scheme the protective sheath. According to the utility model discloses a handheld device also can obtain above-mentioned arbitrary technical scheme's technological effect naturally.

Drawings

Fig. 1 is a schematic structural view of a protective sheath according to an embodiment of the present invention;

fig. 2 is a front sectional view of the structure of the protective cover according to the embodiment of the present invention;

fig. 3 is an enlarged partial cross-sectional view of a portion E of the protective sheath according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of the inner channel of the sheath tube and a cross-sectional view of the electric wire according to the embodiment of the present invention.

Reference numerals:

1-protective sleeve; 2-an electric wire; 3-wire breaking spark; 10-sheathing a pipe; 100-channels; 101-root; 1010-annular protrusion; 10100-first edge; 10101-a second edge; 1011-a first reinforcing rib; 102-a free portion; 103-a relief structure; 11-a connecting portion; 110-a chuck; 111-a necked section; 112-a second reinforcing rib; 12-a hook portion; a-channel cross section; b-wire cross section; a-the spacing between adjacent raised portions of the relief structure; b-the thickness of the tube wall of the concave portion of the relief structure; c-the spacing between the top of the annular projection and the wire; d-the angle formed by the first edge, the second edge and the radial plane.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present application, it is to be understood that the terms "axial," "radial," "thickness," "angle," "surface," "adjacent," "concave," "convex," "upper," "lower," "inner," "outer," "top," "bottom," and the like are used in an orientation or positional relationship shown in the drawings for convenience and simplicity of description only and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a schematic structural view of a protective cover 1 according to an embodiment of the present invention.

Referring to fig. 1, the protective cover 1 provided in the present embodiment includes: the sheath tube 10 and the connection part 11 have a passage 100 through which the power supply line 2 penetrates inside the sheath tube 10, the sheath tube 10 has a root part 101 connected to the connection part 11, and a radially inward annular protrusion 1010 is formed at an inner wall of the passage 100 of the root part 101 (see fig. 2 described below). The radial direction herein means a radial direction in an approximately circular cross section orthogonal to the longitudinal direction of the sheath tube 10.

Specifically, the sheath tube 10 in the present embodiment is flexible and can deform or bend, and the electric wire 2 may be damaged by external force during use, so that the flexible sheath tube 10 can buffer a part of external force for the electric wire 2 inside the sheath tube 10, thereby prolonging the service life of the electric wire 2; the channel 100 for the power supply wire 2 to penetrate through inside the sheath tube 10 can be used for the wire 2 connected with the handheld device (not shown) to penetrate and wrap the wire 2 inside, so as to form a protective layer for the wire 2 and prolong the service life of the wire 2; because the electric wire 2 must be connected with the handheld device to transmit current for the handheld device, and the connection part of the electric wire 2 and the handheld device is very easy to loosen or fall off, the protective sleeve 1 and the handheld device are assembled together through the connecting part 11 arranged at least one end of the protective sleeve 10, after the connecting part 11 is inserted into a shell (not shown) of the handheld device and is fixedly connected with the handheld device, the connection part of the electric wire 2 and the handheld device is equivalent to the protection of the protective sleeve 1, and a layer of shell protection of the handheld device is added, so that a double-layer protection mechanism is formed, and the safety performance of the electric wire 2 is improved; because the service life of the electric wire 2 is limited, especially when the electric wire 2 is used with a handheld device, the electric wire is frequently bent and broken, and the broken spark 3 generated during the broken is easy to jump to the outside of the handheld device body to bring safety hazards, the annular protrusion 1010 which is formed at the inner wall of the channel 100 of the root part 101 connected with the connecting part 11 and is inward along the radial direction blocks the broken spark 3 by the convex shape under the condition that the broken spark 3 exists, so that the broken spark 3 can be controlled even when the electric wire 2 reaches the bending life and the broken spark 3 jumps to the outside of the handheld device body to endanger the safety of users. Therefore, compared with the conventional protective sleeve 1 which only forms a protective layer on the electric wire 2, the protective sleeve 1 in the embodiment not only improves the bending life of the electric wire 2 under the normal use condition, but also provides ultimate protection for the electric wire 2 after reaching the bending life, and the protective sleeve 1 greatly improves the safety performance of the electric wire 2.

In the present embodiment, the sheath tube 10 is made of a flexible material or an elastically flexible material, and the deformation performance of the sheath tube 10 made of the flexible material can buffer the impact of a part of the external force to the electric wire 2.

In this embodiment, connecting portion 11 and handheld device fixed connection, fixed connection's mode can be threaded connection, and threaded connection simple structure, connection are reliable to still can dismantle, the electric wire 2 appears becoming flexible or easily operates when droing with the handheld device junction the utility model discloses in other embodiments, connecting portion 11 and handheld device fixed connection's mode also can be welding or bonding etc.. In this embodiment, the handheld device is a hair dryer, but not limited thereto, the technical solution of the present invention can be applied to all handheld devices with wires 2. For example, the handheld device may be an electrical splint, a curling iron, or the like.

Fig. 2 is a front view of the structure of the protective sheath 1 according to the embodiment of the present invention, and referring to fig. 1 and 2, preferably, the protective sheath 1 further includes a hook portion 12 extending radially outward from the outer wall of the root portion 101, and an end surface of the hook portion 12 axially away from the connecting portion 11 is flush with an axial position of the annular protrusion 1010. The axial direction here means the longitudinal direction of the elongated sheath tube 10.

In this embodiment, couple portion 12 bottom is continuous with root 101 along the terminal surface that the axial was kept away from connecting portion 11, and the axial position with cyclic annular protrusion 1010 is parallel and level each other, further control the bending joint in the electric wire 2 use, the section position of electric wire 2 has been injectd, the node control with the disconnection of electric wire 2 is at cyclic annular protrusion 1010 above position, even directly will break off the node control in couple portion 12 bottom, can avoid broken string spark 3 to flee the handheld device body outside and then lead to the emergence of incident, improve the factor of safety in the electric wire 2 use.

The material of the hook part 12 in this embodiment can be polyvinyl chloride, which not only has better tensile, bending and impact resistance, but also has better electrical insulation performance and flame retardant performance, thereby further reducing the influence caused by the broken sparks 3 escaping from the outside of the handheld device body.

Referring to fig. 1 and 2, preferably, the sheathing tube 10 has a free portion 102 connected to the root portion 101 and bendable with respect to the root portion 101, the free portion 102 having a smaller wall thickness than the root portion 101.

In the present embodiment, the free portion 102 connected to the root portion 101 and bent with respect to the root portion 101 can make the electric wire 2 bend slightly along with the electric wire 2 when the electric wire 2 needs to be bent in the actual use process of the handheld device, so as to ensure that the electric wire 2 can be protected well when the electric wire 2 needs to be bent. The wall thickness of the free portion 102 connected to the root portion 101 and capable of bending 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 larger than that of the free portion 102, so that the bending resistance of the root portion 101 can be improved, because the bending force of the root portion 101 is the largest and the frequency is the highest when the electric wire 2 is bent in the actual use process, the bending resistance of the root portion 101 is improved, and the bending life of the electric wire 2 can be prolonged.

Referring to fig. 1 and 2, preferably, the outer surface of the free portion 102 and the outer surface of the root portion 101 are each formed with a concavo-convex structure 103 surrounding the sheath tube 10.

In the present embodiment, the concave-convex structure 103 formed by the outer surface of the free portion 102 and the outer surface of the root portion 101 and surrounding the sheath tube 10 can limit the bending range of the electric wire 2, and enhance the strength of the outer surface of the free portion 102 and the outer surface of the root portion 101, thereby preventing the electric wire 2 from being irreparably damaged by excessive bending.

Fig. 3 is a partial sectional view of the protective cover 1 according to the embodiment of the present invention. Referring to fig. 3, it is preferable that a distance a between adjacent convex portions of the concavo-convex structure 103 is 0.75 to 2.00 mm.

In the present embodiment, the distance a between adjacent convex portions of the concave-convex structure 103 is set to 0.75 to 2.00mm, and more preferably 1.0mm, and the distance in this range can satisfy the manufacturing requirement in the actual production while ensuring the bending angle of the protective sheath 1, and an excessively large distance may cause an excessively large bending angle of the electric wire 2 and make the electric wire difficult to recover, and an excessively small distance may cause an increase in the manufacturing cost and an increase in the process difficulty in the actual production.

Referring to fig. 3, the wall thickness b of the free portion 102 at the concave portion of the concavo-convex structure 103 is preferably 0.5 to 1.6 mm.

In the present embodiment, the tube wall thickness range b of the free portion 102 in the concave portion of the concave-convex structure 103 is set to 0.5 to 1.6mm, and more preferably 0.75mm, the tube wall thickness in this range can ensure that the protective sheath 1 can be effectively bent, and can prevent the wire-breaking spark 3 from piercing through the protective sheath 1, and if the tube wall thickness b of the free portion 102 in the concave portion of the concave-convex structure 103 is too large, the portion has a large hardness and cannot be effectively bent, and if the tube wall thickness b is too thin, the wire-breaking spark 3 may pierce through the protective sheath 1 and cause a safety hazard.

Referring to fig. 1 and 2, the outer edge profile of the cross section of the root portion 101 preferably decreases in size along the axial direction from the connecting portion 11 to the free portion 102.

In the present embodiment, since the handheld device is often rotated and translated during use, the portion closer to the handheld device is more likely to be bent at a higher frequency, and the bending amplitude of the power line of the root portion 101 can be limited by providing the root portion 101 with a gradually changing shape. The bending amplitude of the part which is closer to the handheld device, namely the part with higher bending frequency is smaller, so that the phenomenon that the electric wire 2 is broken due to the fact that bending stress is excessively concentrated at a specific position is avoided, and the bending service life of the electric wire 2 is prolonged.

Referring to fig. 1 and 2, preferably, the outer surface of the root portion 101 has a plurality of first reinforcing ribs 1011 extending in the axial direction.

In this embodiment, the plurality of first reinforcing ribs 1011 arranged on the outer surface of the root 101 and extending in the axial direction can increase the strength and rigidity of the root 101 without increasing the wall thickness, and can also prevent the root 101 from deforming due to residual stress, effectively limit the bending amplitude of the electric wire 2 at the root 101, prolong the bending life of the electric wire 2, and meanwhile, the plurality of first reinforcing ribs 1011 arranged on the root 101 and extending in the axial direction increase the number of the first reinforcing ribs 1011, so that the stress generated by the root 101 can be prevented from being excessively concentrated.

In this embodiment, the joint between the wall thickness of the first reinforcing rib 1011 and the wall thickness of the root 101 should adopt arc transition, and the thickness of the first reinforcing rib 1011 should not be greater than the wall thickness of the root 101, so that the reasonable control of the number and height of the first reinforcing ribs 1011 can ensure that the effect of the first reinforcing rib 1011 on improving the strength and rigidity of the root 101 is optimal.

Referring to fig. 1 and 2, preferably, the connecting portion 11 has a chuck 110 at an outermost end of the connecting portion 11 and a necked-down section 111 between the chuck 110 and the root portion 101, and an outer edge of the necked-down section 111 is provided with a second reinforcing rib 112 extending in an axial direction.

In the present embodiment, since the chuck 110 is sleeved on the housing of the handheld device, the necking section 111 is formed in cooperation 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 101, so that the local section of the necking section 111 is sharply necked, the bearing area is rapidly reduced, the load borne by the necking section 111 is rapidly reduced until the necking section is broken, and the second reinforcing rib 112 is arranged on the connecting part 11, so that the connection of the connecting part 11 can be strengthened, and the necking section 111 is not easy to fall off when the necking section is broken.

More preferably, the cross section a of the channel 100 inside the sheath tube 10 is a rounded rectangle, the number of the second reinforcing ribs 112 is four, and the four second reinforcing ribs 112 are respectively arranged at the center of four sides of the rounded rectangle. The utility model discloses in preferred second strengthening rib have four, but not the specific numerical value of restriction radical, two or more than two all can. When the number of the second reinforcing ribs is two, the two second reinforcing ribs are oppositely arranged and correspond to the centers of two sides of the rounded rectangle respectively.

In this embodiment, the cross section a of the passage 100 inside the sheath tube 10 is a rounded rectangle, the cross section design of the rounded rectangle can avoid the electric wire 2 from being scratched when penetrating into the passage 100, four second reinforcing ribs 112 are arranged in the center of four sides corresponding to the rounded rectangle, the force borne by the connecting portion 11 in each direction can be ensured to be balanced, and the positions of the protective sheath 1 and the body can be positioned by limiting the second reinforcing ribs 112 in four directions, so that the dislocation connection is avoided.

Fig. 4 is a cross-sectional view a of the inner channel 100 of the sheath tube 10 and a cross-sectional view B of the electric wire 2 according to the embodiment of the present invention. Referring to fig. 4, preferably, the shape of the cross section a of the passage 100 and the shape of the cross section B of the wire 2 are matched to each other.

In this embodiment, the shape of the cross section a of the channel 100 is matched with the shape of the cross section B of the electric wire 2, so that the shape of the channel 100 inside the sheath tube 10 is similar to the shape of the electric wire 2, and the electric wire 2 is prevented from shaking in the channel 100 inside the sheath tube 10 due to the overlarge diameter of the channel 100 inside the sheath tube 10 or the electric wire 2 is prevented from being difficult to penetrate into the channel 100 due to the undersize, and the strength of the protective sheath 1 is improved.

In some embodiments of the present invention, the shape of the cross section a of the inner channel 100 of the sheath tube 10 and the shape of the cross section B of the electric wire 2 may be circular, in other embodiments of the present invention, the shape of the cross section a of the inner channel 100 of the sheath tube 10 and the shape of the cross section B of the electric wire 2 may also be oval, and may be determined according to the shape of the cross section B of the electric wire 2 to be protected specifically, if the shape of the cross section B of the electric wire 2 to be protected is circular, the shape of the cross section a of the inner channel 100 may be a circular cross section, and if the electric wire 2 to be protected is a flat electric wire 2, the shape of the cross section a of the inner channel 100 may be an oval cross section.

Referring to fig. 3, preferably, the annular protrusion 1010 has a first edge 10100 close to the connecting portion 11 and a second edge 10101 far from the connecting portion 11 along the axial direction, the first edge 10100 and the second edge 10101 extend obliquely to the axial direction, and an included angle d between the first edge 10100 and the second edge 10101 and a radial plane is 45-80 °.

In the present embodiment, the included angle d between the first edge 10100 and the radial plane and the second edge 10101 is 45 ° to 80 °, and more preferably 62 ° to 72 °, and the extending direction of the first edge 10100 close to the connecting portion 11 and the second edge 10101 far from the connecting portion 11 is inclined to the axial direction, and the projection slope is designed to form an angle of 45 ° to 80 ° with the radial plane, so that when the electric wire 2 is disconnected, the disconnection sparks 3 bounce on the projection slope, and do not jump out of the body downwards, thereby improving the safety performance of the protective sleeve 1.

In some embodiments of the present invention, the design of the protruding slope at an angle of 45 ° to 80 ° with the radial plane may be a symmetrical design, and in other embodiments of the present invention, the design of the protruding slope at an angle of 45 ° to 80 ° with the radial plane may also be an asymmetrical design. The design of protruding slope can make the broken string spark 3 beat when domatic going up, because first edge 10100, second edge 10101 and radial plane have certain contained angle, the broken string spark 3 is by the inside direction of bounce-back to the body to avoid the broken string spark 3 to flee out the body, and with the node control of electric wire 2 disconnection in root 101 position, improve its security performance.

Referring to fig. 3, preferably, the distance c between the top of the annular protrusion 1010 and the wire 2 is 0.2 to 1 mm.

In the present embodiment, the distance c between the top of the annular protrusion 1010 and the wire 2 is 0.2 to 1mm, and more preferably 0.55 to 0.65 mm. The proper gap distance between the top of the annular protrusion 1010 and the wire 2 can prevent the wire breaking spark 3 from falling from the gap between the wire 2 and the protective sleeve 1 to cause safety accidents on one hand, and can also prevent the wire 2 from excessively swinging in the protective sleeve 1 to control the swinging amplitude of the wire 2 on the other hand.

According to the utility model discloses a this embodiment, under 180 crooked, load 10N's 2 bending test conditions of electric wire, 2 crooked 10000 times of electric wire, the broken string rate is 0%, carry out the bending test limit test to electric wire 2 in this embodiment under this condition equally, the result shows that 2 bending life of electric wire is the highest to reach 30335 times, compares that present electric wire 2 bending life under the same condition has only 6000 times, and 2 bending life of electric wire has improved 506%.

The protective sleeve 1 provided in the embodiment forms the annular bulge 1010 along the radial direction inwards at the inner wall of the channel 100 of the root 101, can control the wire breaking spark 3, prevent the spark from escaping, and improve the safety performance of the handheld device in the use process, meanwhile, the outer surface of the root 101 and the outer edge of the necking section 111 of the connecting part 11 are respectively provided with the first reinforcing rib 1011 and the second reinforcing rib 112, and the bending life of the electric wire 2 is prolonged through the reasonable arrangement of the first reinforcing rib and the second reinforcing rib, and the safety factor and the bending life of the electric wire 2 are greatly improved through the control of the angle, the thickness and the like of the protective sleeve 1 in the design and manufacturing processes.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (11)

1. A protective sheath for bend protection of a wire of a handheld device, comprising:

a flexible sheathing tube having a passage inside thereof through which the electric wire passes;

the connecting part is arranged at least one end part of the protective sleeve and can be inserted into the shell of the handheld equipment and fixedly connected with the handheld equipment;

the protective sleeve is characterized in that the protective sleeve is provided with a root part connected with the connecting part, and an annular bulge which is inward along the radial direction is formed on the inner wall of a channel of the root part.

2. The protective casing of claim 1 further comprising a hook portion extending radially outward from the outer wall of the root portion, an end surface of the hook portion axially remote from the connection portion being flush with the axial position of the annular projection.

3. A protective casing according to claim 1 or 2 wherein the casing tube has a free portion connected to and bendable relative to the root portion, the free portion having a wall thickness less than the root portion.

4. A protective casing according to claim 3 wherein the outer surface of the free portion and the outer surface of the root portion are each formed with a relief structure around the sheath tube.

5. The protective casing of claim 4, wherein the spacing between adjacent convex portions of the relief structure is 0.75 to 2.00mm, and the thickness of the tube wall of the free portion at the concave portion of the relief structure is 0.5 to 1.6 mm.

6. The protective sheath of claim 3 wherein the cross-section of the root portion has an outer edge profile that decreases in size in an axial direction from the connecting portion to the free portion.

7. A protective casing according to claim 1 or 4 wherein the outer surface of the root portion has a plurality of first ribs extending in an axial direction.

8. The protective casing of any of claims 1, 2, 4, 5, wherein the connection portion has:

a chuck located at an outermost end of the connection portion;

and the necking section is positioned between the chuck and the root, and the outer edge of the necking section is provided with a second reinforcing rib extending along the axial direction.

9. The protective cover of claim 8, wherein the cross section of the channel is a rounded rectangle, the number of the second reinforcing ribs is four, the four second reinforcing ribs are arranged at positions corresponding to the centers of the four sides of the rounded rectangle, and the cross section of the channel is matched with the cross section of the electric wire.

10. The protective sheath of claim 1, wherein the annular protrusion has a first edge close to the connecting portion and a second edge far from the connecting portion along an axial direction, the first edge and the second edge both extend obliquely to the axial direction, the first edge and the second edge form an included angle of 45 ° to 80 ° with the radial plane, and a gap distance between a top of the annular protrusion and the wire is 0.2 mm to 1 mm.

11. A hand-held device characterized by a protective cover according to any one of claims 1-10.

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