Folding attacking and defending dual-purpose shield

Abstract

The invention discloses a folding attacking and defending dual-purpose shield, and relates to the technical field of police equipment, the folding attacking and defending dual-purpose shield comprises a main shield plate, a plurality of hinges are fixedly arranged on the main shield plate, two of the hinges are fixedly provided with side shield plates, one of the hinges is fixedly provided with an upper shield plate, and triangular shield plates are rotatably arranged on two side walls of the upper shield plate; an observation plate is arranged in the middle of the upper shield plate, and a clamping mechanism is arranged in the middle of the main shield plate. Through the arrangement of the trapezoidal plate, the T-shaped sliding rod, the inserting groove, the wedge-shaped block, a long spring, two clamping plates, four fixed plates, a movable plate, a clamping spring and a switching mechanism, adjustment is conducted according to different weapon conditions of a violender, and a user presses and switches defense modes according to the conditions; the device can disperse the received impact force, can also clamp and grab sharp instruments, is suitable for most of dangerous situations, and is simple to operate and high in safety.

Description

Technical Field

[0001] The invention relates to the technical field of police equipment, in particular to a foldable offensive and defensive dual-purpose shield. Background Art

[0002] Explosion-proof shields are defense devices commonly used by modern explosion-proof military and police. They are used to push opponents and protect oneself during riot control. They can effectively block bricks, stones, sticks, glass bottles and other objects from hitting and sprinting. They can also resist ordinary bullets, but cannot resist explosions and large-caliber bullets, penetrating bullets and high-speed kinetic weapons.

[0003] The shields in the prior art are difficult to take targeted measures against attackers with different weapons. The shields block the attacker's sharp weapons, making it difficult to snatch them, which can easily cause harm to the surrounding people. However, when defending against large blunt weapons, there is often a large impact force that causes damage to the user's arms. Summary of the invention

[0004] The technical solution of the present invention aims at the technical problem that the existing technical solution is too single, and provides a solution that is significantly different from the existing technology. Preferably, the purpose of the present invention is to provide a foldable offensive and defensive dual-purpose shield to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a foldable offensive and defensive dual-purpose shield, comprising a main shield plate, a plurality of hinges are fixedly arranged on the main shield plate, two of the hinges are fixedly arranged with side shield plates, one of the hinges is fixedly arranged with an upper shield plate, triangular shield plates are rotatably arranged on both side walls of the upper shield plate, an observation plate is arranged in the middle of the upper shield plate, a clamping mechanism is arranged in the middle of the main shield plate, two electric shock mechanisms are arranged on the side walls of the clamping mechanism, a fixing mechanism is arranged on the top of the upper shield plate, and two L-shaped A limiting plate, a U-shaped limiting plate is fixedly provided on one side wall of the main shield plate close to the L-shaped limiting plate, support plates are fixedly provided on the two ends of the U-shaped limiting plates, two straps are fixedly provided on the support plate, a switching mechanism is fixedly provided on one side of the support plate close to the main shield plate, storage grooves for accommodating triangular shield plates are provided on one side wall of the two side shield plates close to the support plate, accommodating grooves for accommodating hinges are provided on the two side shield plates, the two triangular shield plates are rotatably connected to the two side shield plates, and an alarm is provided on one side wall of the main shield plate close to the support plate.

[0006] Preferably, the fixing mechanism includes two L-shaped mounting plates, two torsion springs, two rotating shafts, a transmission belt, a hook and two transmission wheels. The two rotating shafts are respectively rotatably arranged on both sides of the upper shield plate, and the two triangular shield plates are respectively fixed to the corresponding rotating shafts and fixedly connected. The L-shaped mounting plate is fixedly arranged on the top of the upper shield plate, the two transmission wheels are respectively fixedly arranged on the top of the two transmission shafts, the transmission belt is sleeved on the two transmission wheels, the hook is fixedly arranged on the upper shield plate, and the two torsion springs are sleeved on the two rotating shafts.

[0007] Preferably, the clamping mechanism comprises a trapezoidal plate, two T-shaped sliding bars, four plug-in slots, four wedge blocks, two long springs, two clamping plates, four fixed plates, a movable plate and four clamping springs. A hollow groove is provided in the middle of the main shield plate, the movable plate is slidably arranged in the hollow groove, the four wedge blocks are respectively slidably arranged in the four plug-in slots, the four fixed plates are respectively fixedly arranged at the bottom of the four wedge blocks, the trapezoidal plate is slidably arranged at the top of the movable plate, the two long springs are fixedly arranged between the corresponding fixed plates, the two clamping plates are slidably arranged inside the main shield plate, the four clamping springs are respectively arranged on the outer side walls of the two clamping plates, the four plug-in slots are arranged on the side walls of the two clamping plates close to the trapezoidal plates, the two T-shaped sliding bars are respectively fixedly arranged on the side walls of the two clamping plates, and the main shield plate is provided with sliding grooves for the T-shaped sliding bars to slide.

[0008] Preferably, the switching mechanism includes a diamond block, a diamond groove, a limit ring, a telescopic column, a spiral groove, a plug-in column, a hollow column, two cross rods, a limit block, two limit rods and a connecting column. The diamond block is rotatably arranged on the bottom of the trapezoidal plate, the diamond groove is arranged on the movable plate, the connecting column is fixedly arranged on the bottom of the diamond block, the telescopic column is plug-in arranged inside the connecting column, the two limit rods are fixedly arranged on the side wall of the telescopic column, the spiral groove is arranged on the side wall of the telescopic column, the limit ring is slidably sleeved on the outer wall of the telescopic column, the two cross rods are fixedly arranged on the side wall of the limit ring, the limit block is fixedly arranged on the inner side wall of the limit ring, the hollow column is fixedly arranged on the support plate, and the plug-in column is movably plug-in arranged on the support plate and the hollow column.

[0009] Preferably, each of the electric shock mechanisms comprises a power plug, an electric shock frame and a socket, the electric shock frame is fixedly arranged on the clamping plate, the power plug is fixedly arranged inside the side panel, the socket is fixedly arranged on a side wall of the clamping plate close to the side panel, and the alarm is electrically connected to the socket.

[0010] Preferably, one end of the two sockets close to the trapezoidal plate is a telescopic structure.

[0011] Preferably, the observation panel is bulletproof glass.

[0012] Preferably, the inner side walls of the two U-shaped limiting plates are provided with limiting grooves for the cross rod to slide.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The present invention realizes adjustment for different weapon situations of the perpetrators through the arrangement of a trapezoidal plate, a T-shaped slide bar, a plug-in slot, a wedge block, a long spring, two clamping plates, four fixed plates, a movable plate, a clamping spring and a switching mechanism. The user presses to switch the defense mode according to the situation, which can not only disperse and buffer the impact force received, but also clamp and snatch sharp weapons. It is suitable for most dangerous situations, is simple to operate, and has strong safety.

[0015] (2) The present invention provides a power plug, an electric shock frame and a socket, so that the electric shock frame can be powered on only after installation is completed, ensuring that it is not powered on when not in use, thereby ensuring the safety of the user, saving power, and being energy-saving and environmentally friendly;

[0016] (3) The present invention provides two L-shaped mounting plates, two torsion springs, two rotating shafts, a transmission belt, a hook and two transmission wheels, so that when opening, the triangular shield plate and the side shield plate can be driven to open completely directly by pulling the transmission belt, and fixed by the hook. The operation is simple, the shield plate can be opened quickly for defense, and it is used to deal with emergencies, and the practicality is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the first orientation of the overall structure of the present invention;

[0018] Figure 2 It is a second orientation schematic diagram of the overall structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the main shield of the present invention;

[0020] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0021] Figure 5 It is a partial structural schematic diagram of the switching mechanism of the present invention;

[0022] Figure 6 It is a schematic diagram of the switching mechanism of the present invention;

[0023] Figure 7 It is a schematic diagram of the bottom structure of the switching mechanism of the present invention;

[0024] Figure 8 It is a schematic diagram of the structure of the electric shock mechanism of the present invention;

[0025] Fig. 9 for Figure 8Enlarged view of point B in the middle;

[0026] Fig.10 It is a schematic diagram of the fixing mechanism structure of the present invention.

[0027] In the figure: 1. Main shield plate; 2. Side shield plate; 3. Triangular shield plate; 4. Upper shield plate; 5. Fixing mechanism; 51. L-shaped mounting plate; 52. Torsion spring; 53. Rotating shaft; 54. Transmission belt; 55. Hook; 56. Transmission wheel; 6. Clamping mechanism; 61. Trapezoidal plate; 62. T-shaped slide bar; 63. Plug-in slot; 64. Wedge block; 65. Long spring; 66. Clamping plate; 67. Fixed plate; 68. Movable plate; 69. Clamping spring; 7. Electric shock mechanism; 71. Power plug; 72. Electric shock frame; 73, socket; 8, switching mechanism; 81, diamond block; 82, diamond groove; 83, limit ring; 84, telescopic column; 85, spiral groove; 86, plug-in column; 87, hollow column; 88, cross rod; 89, limit block; 810, limit rod; 811, connecting column; 9, receiving groove; 10, hinge; 11, observation plate; 12, strap; 13, support plate; 14, U-shaped limit plate; 141, limit groove; 15, L-shaped limit plate; 16, storage groove; 17, alarm. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-10, an embodiment provided by the present invention: a foldable offensive and defensive dual-purpose shield, comprising a main shield plate 1, on which a plurality of hinges 10 are fixedly arranged, two of which are fixedly arranged with side shield plates 2, one of which is fixedly arranged with an upper shield plate 4, and triangular shield plates 3 are rotatably arranged on both side walls of the upper shield plate 4, an observation plate 11 is arranged in the middle of the upper shield plate 4, a clamping mechanism 6 is arranged in the middle of the main shield plate 1, and two electric shock mechanisms 7 are arranged on the side walls of the clamping mechanism 6, a fixing mechanism 5 is arranged on the top of the upper shield plate 4, and two L-shaped limit plates 15 are fixedly arranged on one side of the main shield plate 1, and the main shield A U-shaped limiting plate 14 is fixedly provided on one side wall of the plate 1 close to the L-shaped limiting plate 15, a supporting plate 13 is fixedly provided on the two ends of the U-shaped limiting plates 14, two straps 12 are fixedly provided on the supporting plate 13, a switching mechanism 8 is fixedly provided on one side of the supporting plate 13 close to the main shield plate 1, a side wall of the two side shield plates 2 close to the supporting plate 13 is provided with a receiving groove 16 for accommodating the triangular shield plate 3, and a receiving groove 9 for accommodating the hinge 10 is provided on the two side shield plates 2, the two triangular shield plates 3 are rotatably connected with the two side shield plates 2, and an alarm 17 is provided on one side wall of the main shield plate 1 close to the support plate 13. First, open the upper shield plate 4, then pull the fixing mechanism 5 to drive the triangular shield plate 3 and the side shield plate 2 to open synchronously, and fix them through the fixing mechanism 5 after they are fully opened. At this time, after the installation is completed, the side shield plate 2 is connected to the main shield plate 1 and energized, so that the alarm 17 and the electric shock mechanism 7 are powered on, and the synchronized alarm 17 sends out an alarm sound to call for support. Then, according to the weapon used by the perpetrator, it is determined what method to use for defense. If it is a sharp weapon such as a sword, the user does not need to actively use the switching mechanism 8. If the perpetrator attacks the clamping mechanism 6, the clamping mechanism 6 works to clamp the perpetrator. The weapon of the attacker is clamped, and then the attacker is electrocuted through the electric shock mechanism 7. If the attacker uses a large weapon such as a stick, the switching mechanism 8 is pressed to drive the clamping mechanism 6 to switch the state. At this time, when the attacker attacks the clamping mechanism 6, the clamping mechanism 6 performs a certain shock absorption inside. At the same time, the clamping mechanism 6 is connected as a whole to disperse the impact force caused by the attacker's attack and protect the user's arm. The whole can be quickly stored into a box shape through the setting of the hinge 10 and the storage slot 16, and the user can lift it through the support plate 13 for easy carrying.

[0030] Preferably, the fixing mechanism 5 includes two L-shaped mounting plates 51, two torsion springs 52, two rotating shafts 53, a transmission belt 54, a hook 55 and two transmission wheels 56. The two rotating shafts 53 are respectively rotatably arranged on both sides of the upper shield plate 4, and the two triangular shield plates 3 are respectively fixed to the corresponding rotating shafts 53 and fixedly connected. The L-shaped mounting plate 51 is fixedly arranged on the top of the upper shield plate 4, the two transmission wheels 56 are respectively fixedly arranged on the top of the two transmission shafts, the transmission belt 54 is sleeved on the two transmission wheels 56, the hook 55 is fixedly arranged on the upper shield plate 4, and the two torsion springs 52 are sleeved on the two rotating shafts 53. The transmission belt 54 is pulled to drive the transmission wheel 56 to rotate, the transmission wheel 56 rotates to drive the rotating shaft 53 to rotate, and the rotating shaft 53 rotates to drive the triangular shield plate 3 to rotate. After the triangular shield plate 3 is fully opened, the transmission belt 54 is stuck under the hook 55. When opening, only the transmission belt 54 needs to be pulled to drive the triangular shield plate 3 and the side shield plate 2 to be directly fully opened, and they are fixed by the hook 55. The operation is simple, and the triangular shield plate 3 and the side shield plate 2 can be quickly opened for defense. It is used to deal with emergencies and has strong practicality.

[0031] Preferably, the clamping mechanism 6 includes a trapezoidal plate 61, two T-shaped slide bars 62, four plug-in slots 63, four wedge blocks 64, two long springs 65, two clamping plates 66, four fixed plates 67, a movable plate 68 and four clamping springs 69. A hollow groove is provided in the middle of the main shield plate 1, and the movable plate 68 is slidably arranged in the hollow groove. The four wedge blocks 64 are respectively slidably arranged in the four plug-in slots 63. The four fixed plates 67 are respectively fixedly arranged at the bottom of the four wedge blocks 64. The plate 61 is slidably arranged on the top of the movable plate 68, the two long springs 65 are fixedly arranged between the corresponding fixed plates 67, the two clamping plates 66 are slidably arranged inside the main shield plate 1, the four clamping springs 69 are respectively arranged on the outer side walls of the two clamping plates 66, the four plug-in grooves 63 are arranged on the side walls of the two clamping plates 66 close to the trapezoidal plate 61, the two T-shaped sliding bars 62 are respectively fixedly arranged on the side walls of the two clamping plates 66, and the main shield plate 1 is provided with a sliding groove for the T-shaped sliding bar 62 to slide. When the trapezoidal plate 61 is attacked by a blunt object, the trapezoidal plate 61 moves and drives the wedge block 64 to be inserted into the plug-in slot 63, so that the clamping plate 66, the trapezoidal plate 61 and the movable plate 68 form a whole, disperse the impact force, and a buffer spring can be added between the movable plate 68 and the trapezoidal plate 61 according to the situation to increase the impact resistance. When encountering a sharp weapon attack, after switching through the switching mechanism 8, when the attacker attacks the trapezoidal plate 61, the trapezoidal plate 61 is resisted by the switching mechanism 8, thereby driving the movable plate 68 to move synchronously for a distance, and the movable plate 68 moves so that the clamping plate 66 is separated from the resistance of the movable plate 68, and moves quickly under the elastic force of the clamping spring 69, so that the clamping plate 66 clamps the attacker's sharp weapon; it realizes adjustment according to the different weapon conditions of the attacker, which can not only reduce the impact but also clamp the sharp weapon, is suitable for most dangerous situations, is simple to operate, and has strong safety.

[0032] Preferably, the switching mechanism 8 includes a diamond block 81, a diamond groove 82, a stop ring 83, a telescopic column 84, a spiral groove 85, a plug column 86, a hollow column 87, two cross rods 88, a stop block 89, two stop rods 810 and a connecting column 811, wherein the diamond block 81 is rotatably arranged at the bottom of the trapezoidal plate 61, the diamond groove 82 is arranged on the movable plate 68, the connecting column 811 is fixedly arranged at the bottom of the diamond block 81, and the telescopic column 84 is plugged into the connecting column 811. Inside the column 811, the two limit rods 810 are fixedly arranged on the side wall of the telescopic column 84, the spiral groove 85 is arranged on the side wall of the telescopic column 84, the limit ring 83 is slidably sleeved on the outer wall of the telescopic column 84, the two cross rods 88 are fixedly arranged on the side wall of the limit ring 83, the limit block 89 is fixedly arranged on the inner wall of the limit ring 83, the hollow column 87 is fixedly arranged on the support plate 13, and the plug-in column 86 is movably plugged into the support plate 13 and the hollow column 87. By pressing the plug-in column 86, the cross rod 88 and the limit ring 83 are driven to move synchronously, and the movement of the limit ring 83 drives the limit block 89 to move synchronously. When the limit block 89 moves, due to the setting of the spiral groove 85, the telescopic column 84 and the connecting column 811 rotate synchronously. The rotation of the connecting column 811 drives the diamond block 81 to rotate ninety degrees, so that the diamond block 81 is aligned with the diamond groove 82, so that the trapezoidal plate 61 will not move synchronously with the movable plate 68; the user presses to switch the defense mode according to the situation, and the operation is simple, convenient and fast.

[0033] Preferably, each of the electric shock mechanisms 7 includes a power plug 71, an electric shock frame 72 and a socket 73, wherein the electric shock frame 72 is fixedly arranged on the clamping plate 66, the power plug 71 is fixedly arranged inside the side plate, the socket 73 is fixedly arranged on a side wall of the clamping plate 66 close to the side plate, and the alarm 17 is electrically connected to the socket 73. After the side shield plate 2 and the main shield plate 1 are connected, the power plug 71 is inserted into the socket 73, so that the electric shock frame 72 is energized, which is convenient for the user to counterattack; the electric shock frame 72 is energized only after the installation is completed, so that it is not energized when not in use, which ensures the safety of the user, saves power, and is energy-saving and environmentally friendly.

[0034] Preferably, one end of the two sockets 73 close to the trapezoidal plate 61 is a telescopic structure.

[0035] Preferably, the observation panel 11 is bulletproof glass.

[0036] Preferably, the inner side walls of the two U-shaped limiting plates 14 are provided with limiting grooves 141 for the cross rod 88 to slide.

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A foldable offensive and defensive shield, comprising a main shield plate (1), characterized in that: The main shield plate (1) is fixedly provided with a plurality of hinges (10), two of which are fixedly provided with side shield plates (2), one of which is fixedly provided with an upper shield plate (4), both side walls of the upper shield plate (4) are rotatably provided with triangular shield plates (3), an observation plate (11) is provided in the middle of the upper shield plate (4), a clamping mechanism (6) is provided in the middle of the main shield plate (1), two electric shock mechanisms (7) are provided on the side walls of the clamping mechanism (6), a fixing mechanism (5) is provided on the top of the upper shield plate (4), two L-shaped limiting plates (15) are fixedly provided on one side of the main shield plate (1), and a side wall of the main shield plate (1) close to the L-shaped limiting plate (15) is fixedly provided with a fixing mechanism (5). A U-shaped limiting plate (14) is fixedly provided, and a supporting plate (13) is fixedly provided at the ends of the two U-shaped limiting plates (14), and two binding straps (12) are fixedly provided on the supporting plate (13). A switching mechanism (8) is fixedly provided on the side of the supporting plate (13) close to the main shield plate (1), and a side wall of the two side shield plates (2) close to the supporting plate (13) is provided with a receiving groove (16) for accommodating the triangular shield plate (3), and a receiving groove (9) for accommodating the hinge (10) is provided on the two side shield plates (2). The two triangular shield plates (3) and the two side shield plates (2) are rotatably connected, and an alarm (17) is provided on the side wall of the main shield plate (1) close to the supporting plate (13).

2. A foldable offensive and defensive shield according to claim 1, characterized in that: The fixing mechanism (5) comprises two L-shaped mounting plates (51), two torsion springs (52), two rotating shafts (53), a transmission belt (54), a hook (55) and two transmission wheels (56); the two rotating shafts (53) are respectively rotatably arranged on both sides of the upper shield plate (4); and the two triangular shield plates (3) are respectively fixedly connected to the corresponding rotating shafts (53); the L-shaped mounting plate (51) is fixedly arranged on the top of the upper shield plate (4); the two transmission wheels (56) are respectively fixedly arranged on the top of the two transmission shafts; the transmission belt (54) is sleeved on the two transmission wheels (56); the hook (55) is fixedly arranged on the upper shield plate (4); and the two torsion springs (52) are sleeved on the two rotating shafts (53).

3. A foldable offensive and defensive shield according to claim 1, characterized in that: The clamping mechanism (6) comprises a trapezoidal plate (61), two T-shaped slide bars (62), four plug-in slots (63), four wedge-shaped blocks (64), two long springs (65), two clamping plates (66), four fixed plates (67), a movable plate (68) and four clamping springs (69). A hollow groove is arranged in the middle of the main shield plate (1). The movable plate (68) is slidably arranged in the hollow groove. The four wedge-shaped blocks (64) are respectively slidably arranged in the four plug-in slots (63). The four fixed plates (67) are respectively fixedly arranged at the bottom of the four wedge-shaped blocks (64). The trapezoidal plate (61) is slidably arranged on the top of the movable plate (68), the two long springs (65) are fixedly arranged between the corresponding fixed plates (67), the two clamping plates (66) are slidably arranged inside the main shield plate (1), the four clamping springs (69) are respectively arranged on the outer side walls of the two clamping plates (66), the four plug-in grooves (63) are arranged on the side walls of the two clamping plates (66) close to the trapezoidal plate (61), the two T-shaped sliding bars (62) are respectively fixedly arranged on the side walls of the two clamping plates (66), and the main shield plate (1) is provided with a sliding groove for the T-shaped sliding bar (62) to slide.

4. A foldable offensive and defensive shield according to claim 3, characterized in that: The switching mechanism (8) comprises a diamond block (81), a diamond groove (82), a limiting ring (83), a telescopic column (84), a spiral groove (85), a plug-in column (86), a hollow column (87), two cross rods (88), a limiting block (89), two limiting rods (810) and a connecting column (811); the diamond block (81) is rotatably arranged at the bottom of the trapezoidal plate (61); the diamond groove (82) is arranged on the movable plate (68); the connecting column (811) is fixedly arranged at the bottom of the diamond block (81); and the telescopic column (84) is plugged and arranged at the connecting column (811). Inside the connecting column (811), the two limiting rods (810) are fixedly arranged on the side wall of the telescopic column (84), the spiral groove (85) is arranged on the side wall of the telescopic column (84), the limiting ring (83) is slidably sleeved on the outer wall of the telescopic column (84), the two cross rods (88) are fixedly arranged on the side wall of the limiting ring (83), the limiting block (89) is fixedly arranged on the inner wall of the limiting ring (83), the hollow column (87) is fixedly arranged on the support plate (13), and the plug-in column (86) is movably plugged on the support plate (13) and the hollow column (87).

5. The foldable offensive and defensive shield according to claim 3, characterized in that: Each of the electric shock mechanisms (7) comprises a power plug (71), an electric shock frame (72) and a socket (73); the electric shock frame (72) is fixedly arranged on the clamping plate (66); the power plug (71) is fixedly arranged inside the side plate; the socket (73) is fixedly arranged on a side wall of the clamping plate (66) close to the side plate; and the alarm (17) is electrically connected to the socket (73).

6. A foldable offensive and defensive shield according to claim 5, characterized in that: One end of each of the two sockets (73) close to the trapezoidal plate (61) is a telescopic structure.

7. The foldable offensive and defensive shield according to claim 1, characterized in that: The observation panel (11) is bulletproof glass.

8. The foldable offensive and defensive shield according to claim 1, characterized in that: The inner side walls of the two U-shaped limiting plates (14) are provided with limiting grooves (141) for the cross rod (88) to slide.

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