Safety helmet

Abstract

The invention is suitable for the technical field of safety helmets, and provides a safety helmet which comprises a helmet shell, a top belt fixedly connected with the helmet shell, a helmet hoop fixedly connected with the top belt and a chin belt fixedly connected with the helmet hoop. A plurality of fixing grooves with arc-shaped inner surfaces are formed in the inner side of the helmet shell, and limiting parts used for limiting the top belt are arranged on the inner side walls of the fixing grooves. The end of the top belt is provided with fixing parts which are matched with the fixing grooves and arranged in an inclined mode, and the fixing parts are provided with limiting grooves clamped with the limiting parts. The problems that an existing safety helmet is concentrated in stress, prone to cracking and insufficient in strength and durability are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of safety helmets, and particularly to a safety helmet. Background Art

[0002] As an important personal protective equipment, safety helmets are widely used in industries such as construction, mining, metallurgy, and power to protect the head from falling objects, impacts, splashes, etc. The structure of a safety helmet mainly includes a helmet shell, a helmet liner, etc. The helmet liner includes components such as a top band, a cap band, and a chin strap. The top band is the part in the helmet liner that directly contacts the user's head and plays a crucial role in wearing comfort and safety.

[0003] In traditional safety helmets, the top band is usually fixed to the helmet shell through connectors. For ease of installation and positioning, these connectors and their fixing grooves on the helmet shell are usually designed to be square. Specifically, the number of connection points between the top band and the helmet shell is generally 4 or 6. At each connection point, the connectors on the top band and the fixing grooves on the helmet shell are both square.

[0004] However, this traditional square connection structure has obvious defects in the injection molding process, which will affect the overall performance and service life of the safety helmet:

[0005] 1. Stress concentration and cracking risk: During the injection molding process, when the plastic melt flows through the sharp corners of the square fixing grooves and square connectors, the flow pattern changes sharply. This sharp change causes large stress concentration at the sharp corners. These residual stresses are extremely likely to cause cracks to gradually expand and even fracture at the sharp corners when the safety helmet is subjected to impact or vibration, thereby reducing the protective performance of the safety helmet and threatening the safety of users.

[0006] 2. Flow resistance and material shortage defects: During the injection molding process of the helmet shell and the top band, the right-angle structure of the square fixing groove will cause the flow state of the plastic melt to change suddenly at the sharp corner part, generating local high shear stress and melt retention phenomenon. This not only increases the flow resistance but also easily leads to insufficient filling in the sharp corner area. The plastic melt may not be able to completely fill the sharp corner area, forming pores or material shortage defects, resulting in a high rejection rate. Even if it is barely filled, a weak area is easily formed at the sharp corner, affecting the strength and uniformity of the product.

[0007] 3. Insufficient strength and durability: The angular design of the square connection groove weakens the material continuity, and its mechanical properties are weaker than those of a smooth transition structure. The strength and durability at the connection between the helmet shell and the top band are often insufficient and difficult to meet the mechanical load-bearing requirements under high-strength working conditions. After long-term use or being subjected to impact, it is more likely to produce permanent deformation or fracture, reducing the service life of the safety helmet.

[0008] In summary, the existing square connection structure between the top strap and the cap shell of a safety helmet has obvious defects during the injection molding process, resulting in problems such as stress concentration, easy cracking, insufficient strength and durability in the safety helmet, which urgently need to be improved. Summary of the Invention

[0009] Based on this, the object of the present invention is to provide a safety helmet to fundamentally solve the problems of stress concentration, easy cracking, insufficient strength and durability existing in the existing safety helmets.

[0010] A safety helmet according to an embodiment of the present invention includes a cap shell, a top strap fixedly connected to the cap shell, a cap band fixedly connected to the top strap, and a chin strap fixedly connected to the cap band;

[0011] A plurality of fixing grooves with arc-shaped inner surfaces are provided on the inner side of the cap shell, and a limiting portion for limiting the top strap is provided on the inner side wall of the fixing groove;

[0012] An inclined fixing portion matching each fixing groove is provided at the end of the top strap, and a limiting groove engaging with the limiting portion is provided on the fixing portion.

[0013] In addition, a safety helmet according to the above embodiment of the present invention may further have the following additional technical features:

[0014] Further, four first fixing grooves symmetrically distributed in the circumferential direction are provided on the inner side of the cap shell. The top strap includes a bearing portion, four first connecting portions symmetrically distributed in the circumferential direction connected to the outer periphery of the bearing portion, an inclined first fixing portion connected to the end of the first connecting portion, and a first extending portion bifurcated and connected to one side of each first connecting portion;

[0015] A plurality of through holes distributed in the circumferential direction are provided on the bearing portion. The first fixing portion matches the first fixing groove, and a first fixing hole for fixedly connecting to the cap band is provided at the end of the first extending portion.

[0016] Further, four second fixing grooves symmetrically distributed are provided on the left and right sides of the cap shell. The top strap further includes two second connecting portions connected to the bearing portion, two second extending portions bifurcated and connected to both sides of each second connecting portion, and an inclined second fixing portion connected to the end of the second extending portion;

[0017] A second fixing hole for fixedly connecting to the cap band is provided at the end of the second connecting portion.

[0018] Further, the first fixing portion includes a first connecting plate connected to an end of the first connecting portion, a first fixing plate having a top connected to an end of the first connecting plate, and two first reinforcing plates respectively connected to two sides of the first connecting plate and an inner wall of the first fixing plate;

[0019] An outer wall of the first fixing plate is provided with a first limiting groove, and a first avoiding notch for avoiding the first connecting plate is provided on a side of the first fixing groove close to an inner surface of the cap shell.

[0020] Further, the second fixing portion includes a second connecting plate connected to an end of the second extending portion, a second fixing plate having a top connected to an end of the second connecting plate, and two second reinforcing plates respectively connected to two sides of the second connecting plate and an inner wall of the second fixing plate;

[0021] An outer wall of the second fixing plate is provided with a second limiting groove, and a second avoiding notch for avoiding the second connecting plate is provided on a side of the second fixing groove close to an inner surface of the cap shell.

[0022] Further, a thickness of an inner wall at a bottom end of the fixing groove is greater than a thickness of an inner wall at a top end thereof, and a top end of the fixing groove protrudes from the inner surface of the cap shell.

[0023] Further, a depth of the fixing groove is greater than a length of the fixing groove, and a bottom of the fixing groove is an arc surface.

[0024] Further, first fixing members and second fixing members integrally injection-molded and symmetrically distributed along a front-back direction of a central axis are provided on an outer surface of the cap shell;

[0025] The first fixing member includes a first card slot and a second card slot which are arranged in parallel and used for fixing different lighting fixtures;

[0026] The second fixing member includes two buckles symmetrically distributed along a left-right direction of the central axis and used for fixing cables, and symmetrically arranged sliding grooves are respectively provided on side walls of the two adjacent buckles, and a clamping structure for clamping a handle of a warning lamp is jointly formed by the sliding grooves arranged between the two buckles.

[0027] Further, the cap band includes an annular band, and an adjusting band and an adjusting buckle respectively connected to two ends of the annular band;

[0028] Ventilation holes, anti-collision columns, fixing columns for connecting and fixing the top band and the chin band, and fixing protrusions for connecting and fixing a sweat-absorbing band are provided on the annular band along a length direction thereof.

[0029] Further, a plurality of positioning holes are provided on the adjusting band along a length direction thereof;

[0030] The adjusting buckle includes a buckle body connected to the annular band, a positioning post provided on the surface of the buckle body, and two ejecting mechanisms distributed on both sides of the buckle body;

[0031] A channel for the adjusting band to pass through is provided inside the buckle body and penetrates both sides. The positioning post is provided with a guiding inclined surface for inserting the adjusting band on the entrance side of the channel, and a locking surface matching the positioning hole for embedding in the positioning hole on the exit side of the channel. The ejecting mechanism is used to synchronously lift the adjusting band when pressed to separate the positioning hole from the positioning post.

[0032] The safety helmet provided by the embodiment of the present invention, by adopting the design of a fixing groove with an arc-shaped inner surface and a matching fixing part, eliminates the stress concentration at the sharp corners, improves the strength and toughness of the connection; by the end of the fixing groove extending out of the inner surface of the helmet shell, a larger installation space and a more reliable clamping are provided for the fixing part, effectively preventing accidental detachment; and by the inclined design of the inner wall of the fixing groove, the stability of the connection is further enhanced; and through the cooperation of the limiting part and the limiting groove, double locking is achieved to ensure the firm and reliable connection between the top band and the helmet shell; at the same time, the arc-shaped design avoids sharp corners, improves the fluidity of the plastic melt in the mold, reduces stress concentration, reduces the risk of defects such as cracking and material shortage, and improves the qualified rate and service life of the product; solves the problems of stress concentration, easy cracking, insufficient strength and durability existing in the existing safety helmets. Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of one of the safety helmets in the first embodiment of the present invention from the first perspective;

[0034] Figure 2 It is a schematic structural diagram of another safety helmet in the first embodiment of the present invention from the second perspective;

[0035] Figure 3 It is a schematic structural diagram of another safety helmet in the first embodiment of the present invention from the third perspective;

[0036] Figure 4 It is an exploded view of another safety helmet in the first embodiment of the present invention from the fourth perspective;

[0037] Figure 5 It is an exploded view of another safety helmet in the first embodiment of the present invention from the fifth perspective;

[0038] Figure 6 It is a schematic structural diagram of the top band of the safety helmet in the first embodiment of the present invention from the sixth perspective;

[0039] Figure 7 It is a schematic structural diagram of the cap hoop of the safety helmet in the first embodiment of the present invention from the seventh perspective;

[0040] Figure 8 This is a schematic structural diagram of the safety helmet in the first embodiment of the present invention when assembled with various accessories;

[0041] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0042] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0043] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0045] Embodiment 1

[0046] Please refer to Figures 1 - 7 , which shows the safety helmet in the first embodiment of the present invention. For the sake of convenience of description, only the parts related to the embodiments of the present invention are shown. The safety helmet 1 provided by the embodiments of the present invention includes a helmet shell 10, a top strap 20 fixedly connected to the helmet shell 10, a cap band 30 fixedly connected to the top strap 20, and a chin strap 40 fixedly connected to the cap band 30;

[0047] A plurality of fixing grooves with arc-shaped inner surfaces are provided on the inner side of the helmet shell 10, and a limiting portion for limiting the top strap 20 is provided on the inner side wall of the fixing groove;

[0048] The end of the top strap 20 is provided with an inclined fixing portion matching each fixing groove, and a limiting groove corresponding to the limiting portion is provided on the fixing portion.

[0049] Among them, in one embodiment of the present invention, the cap shell 10 is integrally hemispherical or ellipsoidal, providing a basic protection space for the head. An H-shaped top rib (reinforcing rib) can be provided at the top of the cap shell 10 to further improve the impact resistance. The edge (brim) of the cap shell 10 is designed with a smooth transition to avoid sharp edges. The cap shell 10 is made of high-strength, high-toughness, and impact-resistant engineering plastics, such as ABS (acrylonitrile-butadiene-styrene copolymer), PC (polycarbonate), HDPE (high-density polyethylene), etc. Multiple fixing grooves are provided on the inner side of the cap shell 10 for connecting with the fixing parts of the top band 20. In one embodiment of the present invention, as one of the structures of the safety helmet, refer to Figure 1 As shown, four first fixing grooves 11 are circumferentially symmetrically distributed on the inner side of the cap shell 10, and the four first fixing grooves 11 are circumferentially symmetrically distributed along the bottom edge of the cap shell 10 (for example, one in each of the front, back, left, and right). In another preferred embodiment of the present invention, as another structure of the safety helmet, refer to Figures 2 - 5 As shown, four second fixing grooves 12 are also symmetrically distributed on the left and right sides of the cap shell 10. At this time, the four second fixing grooves 12 are symmetrically distributed in the middle of the left and right sides of the cap shell 10 (for example, two on each side). Therefore, by setting multiple fixing grooves, the connection strength between the cap shell 10 and the top band 20 can be effectively increased. Correspondingly, a first limiting portion 111 for limiting the top band 20 is provided on the inner side wall of the first fixing groove 11, and a second limiting portion 121 for limiting the top band 20 is provided on the inner side wall of the second fixing groove 12.

[0050] Furthermore, in an embodiment of the present invention, the fixing groove has an arc-shaped inner surface, and the bottom is also an arc surface (which can be a circular arc, an elliptical arc or other smooth curves). The inner wall of the fixing groove inclines towards the inside of the cap shell 10, that is, the thickness of the bottom inner wall of the fixing groove (the side close to the inside of the cap shell 10) is greater than the thickness of the top inner wall (the side close to the outer surface of the cap shell 10). This inclined design is for the following reasons: on the one hand, it is to match the overall shape of the safety helmet that is narrower at the top and wider at the bottom. At this time, the bottom inner wall of the fixing groove is thicker, which means that the limiting part can be longer and thicker, so as to provide a larger contact area and higher strength, and enhance the stability of the connection. On the other hand, it also facilitates the installation and demolding of the fixing part. During the injection molding process, the inclined inner wall provides a demolding slope for the mold, making it easier for the cap shell 10 to be removed from the mold. If the inner wall is vertical, it may cause difficulties in demolding and even damage the product. At the same time, in cooperation with the inclined setting of the fixing part of the top strap 20 and the top strap 20 body, when the fixing part is disassembled, the fixing part moves towards the top of the fixing groove, and the thicker bottom inner wall of the fixing groove forms an inclination to cooperate with the fixing part of the top strap 20. Further, the top end (i.e., the opening) of the fixing groove extends out of the inner surface of the cap shell 10 (i.e., the connection between the cap shell 10 and the brim), providing sufficient space and stroke for the installation of the fixing part of the top strap 20. If the fixing groove does not extend and is flush with the inner surface of the cap shell 10, the fixing part cannot be quickly and effectively inserted directly at this time. Therefore, the protruding end of the fixing groove can play a guiding role during installation, making it easier to align with the fixing groove. At the same time, when the fixing part of the top strap 20 is installed, it needs to be inserted obliquely first, and then through the angle between the fixing part and the top strap 20, the fixing part is moved, and finally the limiting groove is engaged with the limiting part. The protrusion of the end of the fixing groove provides the necessary stroke space for the movement of the fixing part. At the same time, the end of the fixing groove extends out of the inner surface of the cap shell 10, so that the stress transmitted from the top strap 20 to the cap shell 10 can be dispersed to a certain extent, avoiding stress concentration at the root of the fixing groove.

[0051] Furthermore, the depth of the fixing groove (along the radial direction of the cap shell 10) is greater than the length of the fixing groove (along the circumferential direction of the cap shell 10), and the bottom of the fixing groove is an arc surface. At this time, the deeper fixing groove can provide stronger anti-pulling force, and the bottom of the fixing groove is an arc surface and matches the fixing part, so that the friction between the fixing part and the bottom of the fixing groove can be increased or additional positioning can be provided. The inner side wall of the fixing groove is provided with a limiting part for cooperating with the limiting groove on the fixing part of the top strap 20. In this embodiment, the limiting part is preferably a limiting block, and the limiting block can be a single long strip or multiple small blocks. The shape of the limiting block can be rectangular, trapezoidal, arc-shaped, etc., and its height and length match the size of the limiting groove on the fixing part.

[0052] Furthermore, in an embodiment of the present invention, referring to Figure 2 and Figure 8As shown, on the outer surface of the cap shell 10, there are integrally injection-molded first fixing member 13 and second fixing member 14 that are symmetrically distributed before and after along the central axis; the first fixing member 13 includes two first clamping grooves 131 and second clamping grooves 132 that are arranged in parallel and are respectively used to fix different lighting fixtures; the second fixing member 14 includes two clamping buckles that are symmetrically distributed left and right along the central axis and are used to fix cables, and symmetrically arranged sliding grooves 141 are respectively provided on the adjacent side walls of the two clamping buckles, and the sliding grooves 141 provided between the two clamping buckles together form a clamping structure for clamping the handle 41 of the warning lamp 4. Specifically, on the outer surface of the cap shell 10, the first clamping groove 131 and the second clamping groove 132 are sequentially arranged outward, and the opening of the first clamping groove 131 is larger than the opening of the second clamping groove 132. Specifically, the first clamping groove 131 is located inside and has a larger opening, and is used to fix the rotating structure 21 of the headlamp 2. The rotating structure 21 is usually a plastic part with a pivot, and the headlamp 2 can rotate around it to adjust the irradiation angle, and an elastic buckle is provided on the rotating structure, which is used to elastically deform during the insertion and extraction of the elastic buckle in the first clamping groove 131. Further, a receiving notch is provided at the bottom of the first clamping groove 131, which is used to accommodate the elastic buckle on the rotating structure of the headlamp 2 to increase the fixing stability. The second clamping groove 132 is located inside and has a smaller opening, and is used to fix the cap hook 31 of the cordless lamp 3. The cap hook 31 of the cordless lamp 3 is usually a hook made of metal or plastic and can be inserted into the second clamping groove 132.

[0053] Wherein, in an embodiment of the present invention, the top band 20 is made of a high-strength, wear-resistant, and breathable webbing or plastic material, such as nylon webbing, polypropylene webbing, TPU (thermoplastic polyurethane), etc. In an embodiment of the present invention, corresponding to the cap shell 10 having four first fixing grooves 11, its top band 20 includes a bearing portion 21, four first connecting portions 22 that are circumferentially symmetrically distributed and connected to the outer periphery of the bearing portion 21, an inclined first fixing portion 23 connected to the end of the first connecting portion 22, and a first extending portion 24 that is bifurcated and connected to one side of each first connecting portion 22; a plurality of circumferentially distributed through holes are provided on the bearing portion 21, the first fixing portion 23 is matched with the first fixing groove 11, and a first fixing hole for connecting and fixing with the cap hoop 30 is provided at the end of the first extending portion 24. In another embodiment of the present invention, refer to Figure 5 and Figure 6As shown in the figure, corresponding to the cap shell 10 having four first fixing slots 11 and four second fixing slots 12, the top strap 20 further includes two second connecting parts 25 connected to the bearing part 21, two second extending parts 26 bifurcated and connected to both sides of each second connecting part 25, and an inclined second fixing part 27 connected to the end of the second extending part 26; a second fixing hole for connecting and fixing with the cap hoop 30 is provided at the end of the second connecting part 25. Wherein the bearing part 21 is located at the center of the top strap 20, and is circular or oval, and is used to contact the wearer's head. A plurality of through holes distributed circumferentially may be provided on the bearing part 21 to improve breathability, achieve lightweight, and disperse stress. The number of the first connecting parts 22 is 4, and they are symmetrically distributed circumferentially. Both ends of the first connecting part 22 are used to connect the bearing part 21 and the first fixing part 23, and the first extending part 24 is bifurcated and connected near the position of the first fixing part 23. The first fixing part 23 is connected in a matching manner with the first fixing slot 11 at the bottom of the cap shell 10. The first extending part 24 is bifurcated and connected to one side of each first connecting part 22, and a first fixing hole for connecting the cap hoop 30 is provided at the end of the first extending part 24. The number of the second connecting parts 25 is 2, and they are respectively connected to the middle parts of the left and right sides of the bearing part 21. A second fixing hole for connecting and fixing with the cap hoop 30 is provided at the end of the second connecting part 25 away from the bearing part 21. At the same time, two second extending parts 26 are bifurcated and connected to both sides of the second connecting part 25, and an inclined second fixing part 27 is connected to the end of the second extending part 26. The second fixing part 27 is connected in a matching manner with the second fixing slot 12 at the bottom of the cap shell 10.

[0054] Furthermore, in an embodiment of the present invention, the first fixing part 23 includes a first connecting plate 231 connected to the end of the first connecting part 22, a first fixing plate 232 with the top connected to the end of the first connecting plate 231, and two first reinforcing plates 233 respectively connected to both sides of the first connecting plate 231 and the inner wall of the first fixing plate 232; a first limiting slot 2321 is provided on the outer wall of the first fixing plate 232, and a first avoiding notch 112 for avoiding the first connecting plate 231 is provided on the inner surface side of the first fixing slot 11 near the cap shell 10. It should be noted that the width of the first connecting plate 231 is smaller than the width of the first fixing plate 232. At this time, the first fixing slot 11 is generally in a C-shaped slot structure.

[0055] Correspondingly, the second fixing part 27 includes a second connecting plate 271 connected to the end of the second extending part 26, a second fixing plate 272 with its top connected to the end of the second connecting plate 271, and two second reinforcing plates 273 respectively connected to both sides of the second connecting plate 271 and the inner wall of the second fixing plate 272; a second limiting groove 2721 is provided on the outer wall of the second fixing plate 272, and a second avoiding notch 122 for avoiding the second connecting plate 271 is provided on one side of the second fixing groove 12 close to the inner surface of the cap shell 10. It should be noted that the width of the second connecting plate 271 is smaller than the width of the second fixing plate 272, and at this time the second fixing groove 12 is also generally in the shape of a C-shaped groove.

[0056] Wherein, in an embodiment of the present invention, the safety helmet further includes a sweat-absorbing band 50 fixedly connected to the cap band 30. Referring to Figure 7 As shown, the cap band 30 includes an annular band 31, an adjusting band 32 and an adjusting buckle 33 respectively connected to both ends of the annular band 31; ventilation holes 311, anti-collision columns 312, fixing columns 313 for connecting and fixing the top band 20 and the chin strap 40, and fixing protrusions 314 for connecting and fixing the sweat-absorbing band 50 are provided on the annular band 31 along its length direction. The ventilation holes 311 are used to increase the air permeability of the annular band 31 for ventilation and heat dissipation and to disperse stress. The anti-collision columns 312 are used to disperse the impact force, avoid direct contact between the cap shell 10 and the wearer's head, reduce the impact on the top of the wearer's head caused by the deformation of the cap shell 10 under stress, and prevent head injuries. The fixing columns 313 are used to cooperate with the first fixing holes and the second fixing holes on the top band 20 of the safety helmet and the third fixing holes on the chin strap 40 for fixing. Specifically, in this embodiment, the fixing columns 313 are T-shaped columns, and the fixing holes on the corresponding top band 20 and chin strap 40 are T-shaped holes. The fixing protrusions 314 are used to pass through the fixing through holes of the sweat-absorbing band 50 to fix the sweat-absorbing band 50.

[0057] Furthermore, a plurality of positioning holes 321 are provided on the adjusting band 32 along its length direction; the adjusting buckle 33 includes a buckle body 331 connected to the annular band 31, a positioning post 332 provided on the surface of the buckle body 331, and two ejecting mechanisms 333 distributed on both sides of the buckle body 331; a channel for the adjusting band 32 to pass through is provided inside the buckle body 331 and penetrates both sides. The positioning post 332 is provided with a guiding inclined surface for the adjusting band 32 to insert at the entrance side of the channel, and a locking surface matching the positioning holes 321 for embedding the positioning holes 321 is provided on the exit side of the channel. The ejecting mechanisms 333 are used to synchronously lift the adjusting band 32 when pressed to make the positioning holes 321 disengage from the positioning post 332.

[0058] Among them, in an embodiment of the present invention, the chin strap 40 is made of a soft, comfortable and durable webbing material, such as nylon webbing, polyester webbing, etc. The chin strap 40 includes a fixing strap and a buckling strap. Third fixing holes (T-shaped holes) are provided at both ends of the fixing strap for connecting with the fixing posts 313 (T-shaped posts) on the cap hoop 30. The buckling strap includes a male buckle and a female buckle for adjusting the length and tightness of the chin strap 40. The male buckle and the female buckle can adopt various forms such as snap buttons, D-rings, and ladder buckles.

[0059] Therefore, the safety helmet in the embodiment of the present invention eliminates sharp corners by providing a fixing groove with an arc-shaped inner surface on the inner side of the cap shell, enabling the plastic melt to flow smoothly and evenly during the injection molding process, avoiding stress concentration, reducing the risk of cracks at the fixing groove, and improving the overall strength and reliability of the safety helmet; at the same time, the inner wall of the fixing groove with an arc-shaped inner surface is smooth and fluent, reducing the flow resistance of the plastic melt, enabling the melt to fill the entire fixing groove more easily, reducing the material shortage defect, and improving the qualified rate and quality of the product; at the same time, due to the elimination of stress concentration and the improvement of the melt fluidity, the connection between the arc-shaped fixing groove and the top strap fixing block is more firm and reliable, and it is not easy to be damaged even under long-term use or impact, improving the service life and protection performance of the safety helmet; at the same time, the arc structure of the fixing groove makes it more convenient to demold.

[0060] In summary, the safety helmet in the above embodiment of the present invention, by adopting the design of a fixing groove with an arc-shaped inner surface and a matching fixing part, eliminates the sharp corner stress concentration and improves the strength and toughness of the connection; by extending the end of the fixing groove beyond the inner surface of the cap shell, a larger installation space and a more reliable clamping are provided for the fixing part, effectively preventing accidental detachment; and by the inclined design of the inner wall of the fixing groove, the stability of the connection is further enhanced; and through the cooperation of the limiting part and the limiting groove, double locking is achieved to ensure the firm and reliable connection between the top strap and the cap shell; at the same time, the arc-shaped design avoids sharp corners, improves the fluidity of the plastic melt in the mold, reduces stress concentration, reduces the risk of defects such as cracking and material shortage, and improves the qualified rate and service life of the product; it solves the problems of stress concentration, easy cracking, insufficient strength and durability existing in the existing safety helmets.

[0061] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0062] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. A safety helmet, characterized in that: It comprises a cap shell, a top strap connected and fixed to the cap shell, a cap hoop connected and fixed to the top strap, and a chin strap connected and fixed to the cap hoop; A plurality of fixing grooves with arc-shaped inner surfaces are provided on the inner side of the cap shell, and a limiting portion for limiting the top band is provided on the inner side wall of the fixing groove; The ends of the top belt are provided with obliquely arranged fixing parts matching the respective fixing grooves, and the fixing parts are provided with limiting grooves engaged with the limiting parts.

2. The safety helmet according to claim 1, characterized in that: The inner side of the cap shell is provided with four first fixing grooves symmetrically distributed in the circumferential direction, and the top band includes a bearing portion, four first connecting portions symmetrically distributed in the circumferential direction connected to the outer circumference of the bearing portion, an inclined first fixing portion connected to the end of the first connecting portion, and a first extending portion bifurcated and connected to one side of each of the first connecting portions; The bearing portion is provided with a plurality of circumferentially distributed through holes, the first fixing portion matches the first fixing groove, and the end of the first extending portion is provided with a first fixing hole connected and fixed to the cap hoop.

3. The safety helmet according to claim 2, characterized in that: The left and right sides of the cap shell are also provided with four second fixing grooves symmetrically distributed, and the top strap also includes two second connecting parts connected to the bearing part, two second extending parts connected to the two sides of each second connecting part, and an inclined second fixing part connected to the end of the second extending part; The end of the second connecting portion is provided with a second fixing hole connected and fixed to the cap hoop.

4. The safety helmet according to claim 2, characterized in that: The first fixing portion includes a first connecting plate connected to the end of the first connecting portion, a first fixing plate whose top is connected to the end of the first connecting plate, and two first reinforcing plates respectively connected to both sides of the first connecting plate and the inner wall of the first fixing plate; A first limiting groove is disposed on an outer wall of the first fixing plate, and a first avoiding notch for avoiding the first connecting plate is disposed on a side of the first fixing groove close to the inner surface of the cap shell.

5. The safety helmet according to claim 3, characterized in that: The second fixing portion includes a second connecting plate connected to the end of the second extending portion, a second fixing plate whose top is connected to the end of the second connecting plate, and two second reinforcing plates respectively connected to both sides of the second connecting plate and the inner wall of the second fixing plate; A second limiting groove is disposed on an outer wall of the second fixing plate, and a second avoiding notch for avoiding the second connecting plate is disposed on a side of the second fixing groove close to the inner surface of the cap shell.

6. The safety helmet according to claim 1, characterized in that: The thickness of the inner wall of the bottom end of the fixing groove is greater than the thickness of the inner wall of the top end, and the top end of the fixing groove protrudes from the inner surface of the cap shell.

7. The safety helmet according to claim 1, characterized in that: The depth of the fixing groove is greater than the length of the fixing groove, and the bottom of the fixing groove is an arc surface.

8. The safety helmet according to claim 1, characterized in that: The outer surface of the cap shell is provided with a first fixing member and a second fixing member integrally formed by injection molding and symmetrically distributed front and back along the central axis; The first fixing member includes two first and second slots arranged in parallel for fixing different lighting fixtures; The second fixing member includes two buckles for fixing the cable, which are symmetrically distributed along the central axis, and symmetrical sliding grooves are respectively provided on the side walls adjacent to the two buckles. The sliding grooves arranged between the two buckles together form a clamping structure for clamping the handle of the warning lamp.

9. The safety helmet according to claim 1, characterized in that: The hat hoop comprises a ring band, and an adjustment band and an adjustment buckle respectively connected to two ends of the ring band; The ring belt is provided with ventilation holes, anti-collision columns, fixing columns for connecting and fixing the top belt and the chin belt, and fixing protrusions for connecting and fixing the sweat-absorbing belt along its length direction.

10. The safety helmet according to claim 9, characterized in that: The adjusting belt is provided with a plurality of positioning holes along its length direction; The adjusting buckle comprises a buckle body connected to the ring belt, a positioning column arranged on the surface of the buckle body, and two ejection mechanisms distributed on both sides of the buckle body; The buckle body is provided with a channel running through both sides for the adjustment belt to pass through, the positioning column is provided with a guiding inclined surface for inserting the adjustment belt on the channel entrance side, and the positioning column is provided with a stop surface matching the positioning hole and used to embed in the positioning hole on the channel exit side, and the ejection mechanism is used to synchronously lift the adjustment belt when pressed to make the positioning hole detach from the positioning column.

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