A concave shield

Abstract

The utility model relates to a concave shield, include: shield main part, the shield main part has the male face and with the female face opposite setting male face, the shield main part is by male face to female face arc concave, hold component, hold component assembly in male face, the utility model discloses shield main part adopts the structure opposite with conventional, make the side of holding as the convex surface, namely male face, the side of the baffle concave, namely female face, can form half-enclosed type constraint space. When the shield suppresses the suspect trunk, its arc surface is in line with the human body contour, limits the range of activity of four limbs, avoids the control failure caused by the resistance. In actual use, when suppressing the suspect in the lying position, the concave surface can buckle and press its chest and abdomen, form physical limiting, reduce the possibility of wriggling out.

Description

Technical Field

[0001] This utility model relates to the field of parrying weapon technology, and in particular to a concave shield. Background Technology

[0002] As a crucial defensive weapon in the era of cold weapons, the design concept of the shield has evolved over thousands of years, consistently revolving around improving protective effectiveness and tactical adaptability. Early shields mostly employed flat or slightly convex structures, primarily made of wood, leather, or metal, providing protection by directly blocking attacks. With the evolution of warfare, especially the widespread use of thrusting weapons such as bows, crossbows, and spears, shields gradually evolved into designs with outward-convex curved surfaces. This structure offers two advantages: firstly, the curved surface conforms to the contours of the human body, forming a semi-enclosed protective structure that meets ergonomic requirements; secondly, when arrows, spearheads, or other projectiles contact the shield surface, the curved surface disperses the impact force tangentially, reducing the risk of penetration by deflecting the attack angle, thereby extending the shield's lifespan and enhancing defensive reliability. This design principle is still used in modern protective equipment today.

[0003] In modern times, the application of shields has expanded from the battlefield to law enforcement, security, and other fields, and their functional requirements have become more diversified. For example, in arrest operations, shields need to combine protection and control functions. Although traditional convex shields can effectively resist attacks from sharp weapons and projectiles, they have significant drawbacks when subduing prone suspects—the curved structure makes it easy for the suspect's body to slip along the shield surface, making it difficult to form an effective restraint. Utility Model Content

[0004] The purpose of this utility model is to disclose a concave shield that, while inheriting the advantages of traditional curved surface defense, optimizes its functions to meet the specific needs of modern law enforcement scenarios, thereby achieving a comprehensive improvement in protection, control, adaptability, and security.

[0005] To achieve the above objectives, this utility model discloses a concave shield, comprising: a shield body having a convex surface and a concave surface opposite to the convex surface, the shield body being concave in an arc shape from the convex surface to the concave surface; and a gripping assembly assembled on the convex surface.

[0006] By adopting the above scheme, the shield's main body uses a structure opposite to the conventional one, making the gripping side convex (the sunny side) and the blocking side concave (the shady side), thus forming a semi-enclosed restraint space. When the shield presses down on the suspect's torso, its curved surface conforms to the contours of the human body, restricting the range of motion of the limbs and preventing loss of control due to resistance. In actual use, when restraining a lying suspect, the concave surface can press against their chest and abdomen, creating a physical limit and reducing the possibility of escape.

[0007] Furthermore, at least one edge of the shield body is provided with an arc-shaped groove.

[0008] By adopting the above-mentioned design, arc-shaped grooves are designed on the vertical and horizontal edges of the concave shield to form concave arc notches, which are used to restrain the neck, ankles, or conform to the streamline of the chest. This structure enhances the restraint on key areas through local concavity, while dispersing pressure to reduce the risk of accidental injury. For example, when holding the shield vertically, the upper arc-shaped groove can restrain the suspect's neck to prevent them from raising their head to resist; when holding the shield horizontally, the lateral arc-shaped groove can conform to the chest, reducing the relative slippage between the shield and the body.

[0009] Furthermore, the shield body has two edges parallel to its own length direction that are bent integrally towards the dark side to form a first bent edge, and the angle between the first bent edge and the dark side is an obtuse angle.

[0010] By adopting the above scheme, a triangular support structure similar to reinforcing ribs is formed. When the shield is hit by a sharp object or projectile, the impact force is transmitted to the shield body along the bent edge. The obtuse angle structure disperses the concentrated stress to a larger area, reducing the risk of local deformation. The integrated bending process eliminates the welding or splicing gaps at the edges of traditional shields, avoiding the risk of breakage caused by stress concentration. At the same time, it further improves the suppression and restraint effect on suspects.

[0011] Furthermore, the first bent edge is fitted with a second bent edge, the second bent edge comprising: an assembly edge, the assembly edge being fitted and fixed to the edge of the shield body; and a limiting edge, the limiting edge being integrally bent and formed with the assembly edge and protruding from the edge of the shield body.

[0012] By adopting the above solution, the assembly edge of the second bending edge is fitted and fixed to the edge of the shield body to form the first layer of structural support, thereby increasing the edge thickness and strength; the limiting edge protrudes from the edge of the shield body to form the second layer of protective barrier. If the second bending edge or its assembled functional module is damaged, the damaged part can be replaced separately without scrapping the entire shield, which significantly reduces maintenance costs.

[0013] Furthermore, the angle between the assembly edge and the limiting edge is an obtuse angle.

[0014] By adopting the above scheme, when the concave surface of the shield body presses down on the suspect, the obtuse angle structure of the limiting edge can further press down on his limbs, which can more effectively restrict his range of movement.

[0015] Furthermore, a break is provided in the middle of the limiting edge, and the edge of the break is chamfered.

[0016] By employing the above method, when holding the shield horizontally, the user can align the broken edge with the suspect's chest or abdomen, using the two limiting edges to respectively lock down the suspect's limbs on both sides, such as the arms, ribs, or hip bones, forming a surrounding and locking effect. The chamfered edges of the broken edge, such as rounded corners or bevels, can reduce the sharp friction between the shield and the suspect's body when in contact, reducing the risk of skin scratches or crush injuries.

[0017] Furthermore, the shield body has protruding pain point units on its dark side.

[0018] By adopting the above scheme, the immediate pain sensation of the pain point unit can interrupt the suspect's resistance or escape actions at the moment of law enforcement, giving law enforcement officers time to control the situation. After experiencing pain stimulation multiple times, the suspect may form psychological expectations and reduce their willingness to resist in the future.

[0019] Furthermore, the grip assembly includes at least one set of grips, which are fixedly connected to the sun side.

[0020] By adopting the above solution, the grip can be directly fixed to the front side of the shield, which can make full use of the structural rigidity of the shield body to distribute the stress generated when holding it.

[0021] Furthermore, the grip is provided in two sets, with two grips in each set, and the two grips in each set are arranged along the length and width directions of the shield body, respectively.

[0022] By adopting the above-mentioned solutions, high-end shields often employ a dual-grip or adjustable grip assembly design. Each grip is connected to the shield's front side via a metal bracket or a one-piece molding process, forming a stable triangular or quadrilateral structure. During lateral swings or blocking attacks, the coordinated fixation of multiple grips can resist the shield's rotational torque, preventing control failure due to grip loosening.

[0023] Furthermore, the shield body is provided with an observation window.

[0024] By adopting the above solution, the observation window provides users with a direct view of the front of the shield, avoiding the blindness problem of traditional fully enclosed shields that require observation through gaps at the edges or top of the shield.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. When using a traditional convex shield to subdue a prone suspect, the curved surface creates sliding friction with the ground, making it easy for the suspect to slip off the shield.

[0026] 2. The concave shield, with its reverse curved surface design, creates a semi-enclosed restraint space; the concave surface can fit tightly against the suspect's chest and abdomen, restricting their breathing range and limb movement. When using a concave shield for restraint, the force required for a suspect to break free is increased to 2.5 times that of a traditional shield. 3. The concave edge can trap the suspect's arms or legs. Combined with the holder's limbs and the weight of the shield, it makes it difficult for the suspect to lift their limbs to launch an attack or break free. 4. When facing a standing suspect, use the grab ring of the foot fork to lock the legs and restrict their movement, buying time for subsequent subjugation. After dragging the suspect to the ground, the concave shield can quickly press down on their back, forming a double restraint between the shield and the ground, reducing their chance to roll over or fight back. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the sun-facing structure of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the negative side structure of an embodiment of the present utility model.

[0029] Explanation of key figure labels: 1. Shield body; 11. Front side; 12. Back side; 13. Arc-shaped groove; 14. First bent edge; 2. Grip assembly; 21. Grip; 3. Second bent edge; 31. Assembly edge; 32. Limiting edge; 321. Break; 322. Chamfer; 4. Pain point unit; 5. Observation window. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0033] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0034] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0035] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0036] See the embodiments of this utility model. Figure 1-3 As shown, a concave shield is disclosed, comprising a shield body 1 and a gripping component 2. The gripping component 2 is mounted on the convex side 11. The shield body 1 has a convex side 11 and a concave side 12 opposite to the convex side 11. The shield body 1 is concave in an arc from the convex side 11 to the concave side 12, that is, the convex side 11 (gripping side) is convex, and the concave side 12 (suspect contact side) is concave. The radius of curvature of the concave side 12 and the convex side 11 is preferably 350 mm, based on the average thoracic curvature of an adult male. This design allows the shield body 1 to adopt a structure opposite to the conventional one, with the gripping side being the convex side 11, while the gripping side forms a semi-enclosed restraint space. When the shield presses down on the suspect's torso, its arc surface conforms to the contour of the human body, restricting the range of motion of the limbs and preventing control failure due to resistance. In actual use, when pressing down a suspect in a prone position, the concave surface can press against their chest and abdomen, forming a physical limit and reducing the possibility of escape.

[0037] See Figure 1-3As shown, at least one edge of the shield body 1 is provided with an arc-shaped groove 13. When the length direction of the shield body 1 is consistent with the height direction of the suspect, the arc-shaped groove 13 at the top can be used to press down on the neck; when the arc-shaped groove 13 is at the bottom, it can be used to press down on the ankles; when the length direction of the shield body 1 is perpendicular to the height direction of the suspect, the arc-shaped groove 13 at the top can conform to the suspect's chest, and the arc-shaped groove 13 at the bottom can conform to the suspect's waist, thereby achieving the effect of suppressing the suspect. The localized indentation enhances the restraint on key areas while dispersing pressure to reduce the risk of accidental injury. For example, when holding the shield vertically, the upper arc-shaped groove 13 can press down on the suspect's neck to prevent them from raising their head to resist; when holding the shield horizontally, the lateral arc-shaped groove 13 can conform to the chest, reducing the relative sliding between the shield and the body.

[0038] The grip assembly 2 includes at least one set of grips 21, which are fixedly connected to the front surface 11. The grips 21, directly fixed to the front surface 11 of the shield, can fully utilize the structural rigidity of the shield body 1 to distribute the stress generated during gripping. The installation methods of the grips 21 include, but are not limited to, welding, screwing, riveting, or snap-fitting. The installation direction and position of the grips 21 are not specifically limited and can be changed according to actual comfort.

[0039] In some embodiments, to achieve both lateral and longitudinal gripping of the shield body, two grips 21 are set as a group, and at least two groups are provided. In this embodiment, two hard plastic grips 21 are provided in the width direction of the shield body. By gripping the two hard plastic grips 21, the top and bottom of the shield body can be used to limit and clamp the suspect's neck or legs, achieving a conventional suppression effect. Preferably, a mounting base is provided between the two hard plastic grips 21. The mounting base provides a cushioning and shock-absorbing effect. Specifically, when using the shield, it can reduce the amplitude of hand vibration and discomfort when subjected to external impact. The mounting base is fixed to the front side 11 of the shield body by screw fixing. To prevent the screw from coming loose, a washer can be placed between the screw and the back side 12 of the shield body to improve connection stability. The mounting base maintains grip stability and improves the strength of the shield body itself. The shield body is equipped with two soft leather grips along its length. By gripping these two straps, the shield body can be held laterally, allowing for restraint of the suspect's chest and waist, thus achieving lateral compression. Since vertical grip is the standard configuration, a rigid plastic handle 21 is used to connect to the front. Lateral grip, however, is a more flexible configuration and may only be used in specific situations; therefore, the handle 21 uses soft leather straps to reduce overall weight and space occupation.

[0040] It should be noted that the material and structure of the handle in this embodiment are for reference only. In other embodiments, the structure, specific orientation, and spacing of the handle can be changed to improve the adaptability to use.

[0041] To further enhance the compressive effect during lateral gripping, the two edges of the shield body 1, parallel to its length, are integrally bent towards the negative surface 12 to form a first bent edge 14. The angle between the first bent edge 14 and the negative surface 12 is an obtuse angle. This creates a triangular support structure similar to a reinforcing rib. Optionally, the first bent edge 14 can be provided with an arc-shaped groove 13 for compressing the chest and abdomen. When not provided, it can also directly compress the suspect. The first bent edge 14 provides a larger contact angle with the suspect, resulting in better suppression. Furthermore, when the shield is impacted by a sharp object or projectile, the impact force is transmitted along the bent edge to the shield body 1. The obtuse angle structure disperses the concentrated stress over a larger area, reducing the risk of local deformation. The integral bending process eliminates the welding or splicing gaps at the edges of traditional shields, avoiding the risk of breakage due to stress concentration. At the same time, it further improves the suppression and restraint effect on the suspect.

[0042] In some embodiments, a second bent edge 3 is also fitted onto the first bent edge 14. The fitting position can be either the sun side 11 or the shaded side 12 of the first bent edge 14; this embodiment does not specify a particular fitting position. Specifically, the second bent edge 3 includes a fitting edge 31 and a limiting edge 32. The fitting edge 31 is fitted and fixed to the edge of the shield body 1 to achieve connection and fixation with the second bent edge 3. The limiting edge 32 is integrally bent and formed with the fitting edge 31 and protrudes from the edge of the shield body 1 to further achieve a pressure effect on the suspect's chest and abdomen, thereby inducing pain. The fitting edge 31 of the second bent edge 3 is fitted and fixed to the edge of the shield body 1, forming a first layer of structural support and improving the edge thickness and strength. The limiting edge 32 protrudes from the edge of the shield body 1, forming a second layer of protective barrier. If the second bent edge 3 or its fitted functional modules are damaged, the damaged part can be replaced individually without the need to scrap the entire shield, significantly reducing maintenance costs. Preferably, the angle between the mounting edge 31 and the limiting edge 32 is an obtuse angle. When the concave surface of the shield body presses down on the suspect, the obtuse angle structure of the limiting edge 32 can further compress the suspect's limbs, more effectively restricting their range of motion. In this embodiment 1, the mounting edges 31 on both sides are parallel to each other. This achieves perpendicular contact with the suspect, improving the suppression effect.

[0043] To enable the second bent edge 3 to restrain the suspect and prevent slippage, a break 321 is provided in the middle of the restraining edge 32. The edge of the break 321 is chamfered 322. When holding the shield horizontally, the user can align the break 321 with the suspect's chest or abdomen, using the two restraining edges 32 to respectively press down on the suspect's limbs, such as arms, ribs, or hip bones, forming a surrounding locking effect. The chamfer 322 of the edge of the break 321, such as a rounded corner or bevel, can reduce the edge friction when the shield comes into contact with the suspect's body, reducing the risk of skin scratches or crush injuries. It should be noted that the arc-shaped groove 13 can exist alone or simultaneously with the break 321. When the shield does not have the arc-shaped groove 13, the break 321 can still perform the same function as the arc-shaped groove 13.

[0044] In some embodiments, to reduce the suspect's desire to resist, a protruding pain point unit 4 is provided on the eccentric side 12 of the shield body 1. At the moment of enforcement, the immediate pain from the pain point unit 4 can interrupt the suspect's resistance or escape attempts, buying time for law enforcement officers to control the suspect. After repeated painful stimulation, the suspect may develop a psychological expectation, reducing their future willingness to resist. In this embodiment 1, the pain point unit 4 is a screw passing through the mounting edge 31 of the first bent edge 14 and the second bent edge 3. The screw protrudes from the eccentric side 12 of the shield body, thereby interrupting the suspect's resistance or escape attempts by evoking empathy during the suppression of the suspect, buying time for law enforcement officers to control the suspect. After repeated painful stimulation, the suspect may develop a psychological expectation, reducing their future willingness to resist.

[0045] In other embodiments, the pain point unit 4 can also be other protruding structures, and the location of the pain point unit 4 can be the edge or center of the negative side 12. To avoid excessive harm to the suspect, rubber or silicone material can be added to the surface of the protrusion to avoid skin scratches caused by the metal pain point, while still achieving the corresponding pain sensation, in accordance with the non-lethal weapon use guidelines. The pain point unit 4 can also be a hemispherical electrode contact, achieving the effect of pain through electric shock. The contact layout avoids the heart projection area, the electrode spacing of 30mm ensures current density, and the concentric circle structure covers the main respiratory muscle groups, which can interrupt the breathing rhythm to achieve instantaneous suppression. Optionally, the pain point unit 4 can adopt a press-to-connect power generation contact point, which is intended to enable discharge only when the body torso is pressed. The power generation contact point is set with reference to the dense meridians or weak muscles of the human torso.

[0046] In some embodiments, an observation window 5 may also be provided on the shield body 1. The observation window 5 provides the user with a direct view of the front of the shield, avoiding the blind spot problem of traditional fully enclosed shields that require observation through gaps at the edges or top of the shield. The observation window 5 is preferably transparent bulletproof glass, which can withstand direct fire from handgun bullets while maintaining a clear field of vision. It should be noted that the observation window 5 is positioned at eye level, which facilitates officers in judging the suspect's movements (such as reaching for a weapon or attempting to roll over) during the suppression process, and allows for timely adjustments to tactics.

[0047] In some embodiments, Velcro adhesive areas can be provided around and in the center of the shield body 1 on the shaded side 12 or the exposed side 11 to allow for quick installation and removal of the soft bulletproof layer. To address the varying protection requirements of different mission scenarios, a detachable bulletproof module is designed. After the bulletproof layer is installed, the shield can withstand direct fire from handgun bullets. The bulletproof layer is tightly bonded to the shield body 1 via Velcro, preventing it from detaching due to impact. Removing the bulletproof layer reduces the shield's weight by 30%, improving the officer's agility. The Velcro design supports one-handed operation, allowing for bulletproof layer installation / removal within 10 seconds, adapting to unexpected situations.

[0048] Optionally, to reduce the risk of accidental injury during training, the bulletproof patch or Velcro can cover the pain point unit 4. In this case, the shield can not only intentionally select the level of suppression, but also be used in normal capture training to avoid causing physiological accidental injury to the captured person or the trainee.

[0049] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. When using a traditional convex shield to subdue a prone suspect, the curved surface creates sliding friction with the ground, making it easy for the suspect to slip off the shield.

[0050] 2. The concave shield, through its reverse curved surface design, creates a semi-enclosed restraint space; the concave surface can fit tightly against the suspect's chest and abdomen, restricting their breathing range and limb movement. When using a concave shield for restraint, the force required for a suspect to break free is increased to 2.5 times that of a traditional shield; 3. The concave edge can clamp down on the suspect's arms or legs. Combined with the holder's limbs pressing down and the weight of the shield, it makes it difficult for the suspect to lift their limbs to launch an attack or break free. 4. When facing a standing suspect, use the grab ring of the foot fork to lock the legs and restrict their movement, buying time for subsequent subjugation. After dragging the suspect to the ground, the concave shield can quickly press down on their back, forming a double restraint between the shield and the ground, reducing their chance to roll over or fight back. 5. The shield body 1 has a protruding pain point unit 4 on its dark side 12. During law enforcement, the immediate pain sensation from the pain point unit 4 can interrupt the suspect's resistance or escape attempts, buying time for law enforcement officers to control the suspect. After repeated painful stimulation, the suspect may develop a psychological expectation, reducing their future willingness to resist. The pain point unit 4 can take various forms, such as screws or hemispherical electrode contacts, and its surface can be reinforced with rubber or silicone material to prevent excessive damage.

[0051] 6. Velcro adhesive areas are provided around the shadow side 12 or the sun side 11 of the shield body 1, as well as in the center area, allowing for quick installation and removal of the soft bulletproof layer. A detachable bulletproof module is designed to address the varying protection requirements of different mission scenarios. After the bulletproof layer is installed, the shield can withstand direct fire from handgun bullets. The bulletproof layer is tightly bonded to the shield body 1 via Velcro, preventing it from detaching due to impact. Removing the bulletproof layer reduces the shield's weight, improving the officer's agility. The Velcro design supports one-handed operation, allowing for installation / removal of the bulletproof layer within 10 seconds, adapting to unexpected situations. The bulletproof layer or Velcro can cover the pain point unit 4, suitable for arrest training, reducing the risk of accidental injury.

[0052] 7. The observation window 5 provides the user with a direct view of the front of the shield, avoiding the blindness problem of traditional fully enclosed shields; the observation window 5 is preferably made of transparent bulletproof glass, which can withstand direct bullets from a handgun while maintaining a clear view; its position is at eye level, which makes it easier for police officers to judge the suspect's movements during the suppression process and adjust tactics in a timely manner.

[0053] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A concave shield, characterized in that, include: The shield body (1) has a yang side (11) and a yin side (12) opposite to the yang side (11). The shield body (1) is concave in an arc shape from the yang side (11) to the yin side (12). A grip assembly (2) is assembled on the positive surface (11). The grip assembly (2) includes at least one set of grips (21). The grips (21) are fixedly connected to the positive surface (11). The grips (21) are provided in two sets, with two grips in each set. The two grips (21) in each set are arranged along the length and width directions of the shield body (1), respectively. The shield body (1) has two edges parallel to its own length direction bent into the dark side (12) to form a first bent edge (14), and the angle between the first bent edge (14) and the dark side (12) is an obtuse angle. The first bent edge (14) is fitted with a second bent edge (3), the second bent edge (3) comprising: Assembly edge (31), wherein the assembly edge (31) is fitted and fixed to the edge of the shield body (1); Limiting edge (32), the limiting edge (32) is integrally bent and formed with the assembly edge (31), and protrudes from the edge of the shield body (1); The limiting edge (32) has a break (321) in the middle, and the edge of the break (321) has a chamfer (322).

2. A concave shield according to claim 1, wherein At least one side edge of the shield body (1) is provided with an arc-shaped groove (13).

3. A concave shield according to claim 1, characterized in that, The angle between the assembly edge (31) and the limiting edge (32) is an obtuse angle.

4. A concave shield according to any one of claims 1-3, characterized in that, The shield body (1) has a protruding pain point unit (4) on its dark side (12).

5. A concave shield according to any one of claims 1-3, characterized in that, The shield body (1) is provided with an observation window (5).

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