Supporting and adjusting device of head and neck protection device

Abstract

The utility model discloses a supporting and adjusting device of a head and neck protection device, and mainly relates to head and neck protection. Comprising a connecting block arranged on the rear side of the protective helmet, a main shaft connected with the connecting block, two side shafts symmetrically arranged relative to the main shaft, a back plate and a plurality of adjusting mechanisms arranged on the back plate. The side shaft is rotationally connected with the fixing block, and the multiple adjusting mechanisms are used for adjusting the vertical height of the main shaft and the vertical height of the side shaft correspondingly, so that the positions of the helmet and the head of a wearer are controlled. The utility model has the beneficial effects that the head and the neck of a wearer are protected, the influence of objects falling from high altitudes on the cervical vertebra of the wearer and the injury to the neck of a soldier due to nonstandard actions during parachuting training are avoided, the head and the neck of the wearer are supported, and a good supporting effect can be realized from multiple directions; the device is simple in structure, reduces damage to the head and the neck of a patient, plays a role in protecting the cervical vertebra and the head, is convenient and rapid to adjust, and can be suitable for wearers with different figures.

Description

Technical Field

[0001] The utility model relates to the field of head and neck protection, in particular to a support and adjustment device for a head and neck protection device. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] During military training (parachuting) or construction sites, head trauma is very likely to occur, so according to regulations and requirements, it is necessary to wear protective devices such as safety helmets and helmets. The head can be protected by the protective device when it is hit, but the impact force on the head cannot be buffered and is transmitted to the neck. Since the neck is relatively fragile, it is also very harmful to the human body, ranging from sprains and contusions to cervical disc injuries and even death. Generally speaking, after a serious impact, the injured will usually die within a short time. Even if they are successfully treated, they will also be left with high paraplegia and unable to take care of themselves. The quality of life of the injured is extremely poor, and they need to be accompanied and cared for, which also brings burdens to the family.

[0004] As for the existing head and neck protection devices, most of them limit the movement of the wearer's neck in the flexion and extension direction, and lack the limit on the wearer's neck in the horizontal direction. During skydiving, due to the non-standard skydiving movements during training, it is easy for the head to hit the ground first. Since the position and direction of the head landing are uncertain, this will cause the wearer's head and neck to be impacted from different directions. During construction on the construction site, most of the time, falling objects from high altitude hit the head, but there are also cases where workers fall from high altitudes, and the direction and posture of the fall are uncertain. Therefore, this requires the head and neck protection device to be more comprehensive in the direction of head protection, and it is necessary to buffer the impact from other directions, and it can also effectively protect the wearer's head. Utility Model Content

[0005] The purpose of the utility model is to provide a support and adjustment device for a head and neck protection device, which is used to protect the head and neck of the wearer, avoid the impact of falling objects on the wearer's cervical spine, and prevent the soldier's neck from being injured due to non-standard movements during parachute training. The device supports the wearer's head and neck and can achieve good support effects from multiple directions, reducing the damage to the patient's head and neck, and plays a role in protecting the cervical spine and head. The adjustment process of the device is convenient and fast, and it can be suitable for wearers of different body shapes.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A support and adjustment device for a head and neck protection device comprises a connecting block arranged at the rear side of a protective helmet, a main shaft connected to the connecting block, two side shafts symmetrically arranged with the main shaft, a back plate, and a plurality of adjustment mechanisms arranged on the back plate; the side shafts are rotatably connected to a fixed block, and the plurality of adjustment mechanisms are respectively used to adjust the vertical heights of the main shaft and the side shafts, thereby controlling the position of the helmet and the wearer's head.

[0008] The adjustment mechanism includes two horizontal adjustment mechanisms and a vertical adjustment structure; the vertical adjustment structure includes a displacement adjustment mechanism and a reinforcement member arranged at the bottom of the main shaft; the displacement adjustment mechanism includes a rotating shaft matched with the bottom of the main shaft, a transmission seat arranged on the back plate, and a knob arranged at the bottom of the rotating shaft; a worm section is provided at the bottom of the rotating shaft, and a worm bar section matched with the worm section is provided in the transmission seat, and the rotating knob is engaged with the worm bar through the worm, thereby driving the displacement of the main shaft; the reinforcement member is arranged at the connection between the main shaft and the rotating shaft, and the reinforcement member is used to connect the main shaft and the rotating shaft, and when the rotating shaft rotates, the main shaft does not rotate.

[0009] The rotating shaft and the main shaft matching end are provided with a connecting shaft, the main shaft is provided with a connecting hole adapted to the connecting shaft, and the reinforcing member includes a connecting sleeve, a bearing matched inside the connecting sleeve, a locking hole provided on the connecting sleeve, a locking bolt matched with the locking hole, and a limit seat provided on the back plate;

[0010] The limiting seat cooperates with the main shaft, the outer diameter of the bearing is adapted to the connecting sleeve, the inner diameter of the bearing is adapted to the connecting shaft diameter, the rotating shaft is provided with a clearance groove, the clearance groove is adapted to the locking hole, and the locking bolt acts on the rotating shaft after being screwed.

[0011] The horizontal adjustment mechanism includes a sliding groove arranged on the back plate, a rotating shaft, a connecting rod hinged to the side shaft through the rotating shaft, sliding blocks arranged at both ends of the rotating shaft, and a locking mechanism arranged at the end of the connecting rod;

[0012] A sliding groove adapted to the sliding block is arranged inside the sliding groove, and the horizontal distance between the connecting rod and the sliding groove is controlled by a locking mechanism, thereby controlling the vertical distance of the side shaft.

[0013] The locking mechanism comprises a bidirectional threaded section arranged at the end of the connecting rod, a fixing seat arranged on the back plate, and a locking buckle meshed with each thread of the bidirectional threaded section.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] It is used to protect the wearer's head and neck, avoid the impact of falling objects on the wearer's cervical spine, and prevent neck injuries to soldiers due to non-standard movements during parachute training. The device supports the wearer's head and neck and can achieve good support effects from multiple directions, reducing injuries to the patient's head and neck, and plays a role in protecting the cervical spine and head. The adjustment process of the device is convenient and fast, and it can be suitable for wearers of different body shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is an overall view of the utility model device.

[0017] Attached Figure 2 It is a rear view of the device in the utility model.

[0018] Attached Figure 3 It is a rear view of the device in the utility model.

[0019] Attached Figure 4 It is a transverse sectional view of the sliding groove in the utility model.

[0020] Attached Figure 5 It is a longitudinal sectional view of the sliding groove in the utility model.

[0021] Attached Figure 6 It is an internal sectional view of the main shaft in the utility model.

[0022] Attached Figure 7 It is a top force view of the utility model.

[0023] Attached Figure 8 It is a force view of both sides of the head in the utility model.

[0024] Numbers shown in the accompanying drawings:

[0025] 1. Helmet; 2. Connecting block; 3. Main shaft; 4. Side shaft; 5. Back plate; 6. Rotating shaft; 7. Transmission seat; 8. Knob; 9. Worm section; 10. Worm section; 11. Connecting shaft; 12. Connecting sleeve; 13. Bearing; 14. Locking bolt; 15. Limit seat; 16. Make way groove; 17. Sliding groove; 18. Rotating shaft; 19. Connecting rod; 20. Sliding block; 21. Sliding groove; 22. Bidirectional threaded section; 23. Fixed seat; 24. Locking buckle; 25. Shoulder strap; 26. Chest strap; 27. Quick release buckle. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0027] The utility model is a support and adjustment device for a head and neck protection device, as shown in the accompanying drawings of the specification. Figure 1 — Figure 3 As shown, the helmet 1 of the head and neck protection device is described first. The helmet 1 is definitely used to protect the head of the wearer. The helmet 1 in this application is one size larger than the ordinary helmet, so that the helmet will not restrict the head of the wearer after wearing it, and a soft pad is provided inside the helmet 1. The soft pad is about 5 cm thick and is lined inside the helmet 1. The above is the structure of the helmet 1, but for the supporting device of the helmet 1, it includes a connecting block 2 arranged at the rear side of the helmet 1, a main shaft 3 connected to the connecting block 2, two side shafts 4 symmetrically arranged with the main shaft 3, a back plate 5, and multiple adjustment mechanisms arranged on the back plate 5;

[0028] The helmet 1 is mainly connected by a connecting block 2 arranged at the rear side thereof, and then the helmet 1 is supported and limited in both horizontal and vertical directions by a main shaft 3 and two side shafts 4. The main shaft 3 and the side shafts 4 are both connected to a fixing block, wherein the side shafts 4 are hingedly connected to the fixing block. Due to the different heights and body shapes of the wearers, multiple adjustment mechanisms are used to adjust the vertical heights of the main shaft 3 and the side shafts 4 to adjust the position of the helmet and the wearer's head, which are described separately according to the adjustment directions:

[0029] Vertical adjustment structure (spindle 3):

[0030] As shown in the attached figure of the instruction manual Figure 1 — Figure 3 and Figure 6 As shown, the vertical adjustment structure includes a displacement adjustment mechanism and a reinforcement member arranged at the bottom of the main shaft 3;

[0031] The bottom of the main shaft 3 is equipped with a rotating shaft 6, a transmission seat 7 arranged on the back plate 5, and a knob 8 arranged at the bottom of the rotating shaft 6; a worm segment 9 is provided at the bottom of the rotating shaft 6, and a worm bar segment 10 cooperating with the worm segment 9 is provided in the transmission seat 7. By rotating the knob 8, the worm and the worm bar are engaged, thereby driving the main shaft 3 to move, and the thread lead angle between the worm and the worm bar is used to adjust the distance between the main shaft 3 and the back plate 5. A condition needs to be met during the process of rotating the rotating shaft 6 to adjust the height position of the protective helmet 1. During the adjustment process, the protective helmet 1 cannot rotate, which requires that the rotating shaft 6 and the main shaft 3 are connected and in a separated state, so the corresponding improvement is: a connecting shaft 11 is provided at the mating end of the rotating shaft 6 and the main shaft 3, and the main shaft 3 is provided with a connecting hole adapted to the connecting shaft 11. The separation rotation can be achieved by the matching of the connecting shaft 11 and the connecting hole, but the main shaft 3 and the rotating shaft 6 need to be connected, and a corresponding reinforcement piece is provided. The reinforcement piece is arranged at the connection between the main shaft 3 and the rotating shaft 6, and the reinforcement piece includes a connecting sleeve 12, a bearing 13 arranged inside the connecting sleeve 12, a locking hole arranged on the connecting sleeve 12, a locking bolt 14 matched with the locking hole, and a limit seat 15 arranged on the back plate 5;

[0032] The connecting sleeve 12 is divided into two parts, which are connected by bolts. The outer diameter of the bearing 13 is adapted to the connecting sleeve 12. The outer diameter of the bearing 13 cannot rotate in the connecting sleeve 12. The inner diameter of the bearing 13 is adapted to the diameter of the connecting shaft 11, so that the relative rotation between the rotating shaft 6 and the main shaft 3 can be achieved. However, the main shaft 3 is connected to the rotating shaft 6, so further improvement is made: the rotating shaft 6 is provided with a clearance groove 16, the clearance groove 16 is adapted to the locking hole, and the locking bolt 14 acts on the rotating shaft 6 after being screwed, and the rotating shaft 6 is limited by the locking bolt 14. For the device as a whole, when adjusting the height, it is generally adjusted according to each person's situation. After adjustment, each person uses it independently, so the situation does not need frequent adjustment when adjusting the height. For the process of adjusting the height of the helmet 1: loosen the locking bolt 14, turn the knob 8 through the rotating shaft 6, so that the worm segment 9 and the worm segment 10 are engaged, and then adjust the height of the helmet 1. After the adjustment is completed, screw the locking bolt 14 so that the locking bolt 14 locks the rotating shaft 6.

[0033] For the reinforcement, it not only plays a connecting and locking role, because the main shaft 3 and the rotating shaft 6 are not arranged as an integral whole, the overall force analysis is as follows: for the axial force along the direction of the main shaft 3, the main force-bearing structure is: the pre-tightening force of the locking bolt 14 acting on the rotating shaft 6 and the self-locking force of the threaded structure between the worm and the worm bar, the main load-bearing structure, so it can withstand the axial force along the direction of the main shaft 3, but the force along the radial direction of the main shaft 3 is very small. Therefore, the radial force load of the vertical adjustment structure is increased by the reinforcement section described above: the connecting shaft 11 cooperates with the connecting hole and is arranged at the connection between the main shaft 3 and the rotating shaft 6. As for the limit seat 15, the limit seat 15 is set on the back plate 5 and cooperates with the main shaft 3. The limit seat 15 and the main shaft 3 are matched through the clearance, which does not affect the rotation and displacement of the main shaft 3. At the same time, it can also play a role in reinforcing the main shaft 3. When the wearer's head is hit in the front and back directions, the main load-bearing components are: the sliding block 20 is connected to the side shaft 4 through the connecting rod 19, and the sliding block 20 is matched with the sliding groove 17, and the sliding groove 17 is connected to the back plate 5. The two sliding grooves 17 serve as load-bearing components. At the same time, the main shaft 3 is mainly supported by the fixed seat 23 and the transmission seat 7. If the fixed seat 23 is not set, when the wearer is hit in the front and back directions, the transmission seat 7 serves as a fulcrum to form a labor-saving lever, which may result in insufficient impact resistance. For this reason, the main shaft 3 is further fixed by the fixed seat 23 to make its impact resistance better.

[0034] As for the reinforcement, the connecting sleeve 12 of the reinforcement forms the main shaft 3 and the worm segment 9 into a whole to resist impact. At the same time, the main shaft 3 and the worm segment 9 are sleeved by the connecting sleeve 12 of the reinforcement, and the connecting shaft 11 cooperates with the connecting hole of the main shaft 3, which further increases the bending resistance between the main shaft 3 and the worm segment 9, so that they form a whole.

[0035] However, for the device as a whole, it also has a structure that shares the radial force of the vertical adjustment structure, that is, the side shafts 4 are respectively arranged on both sides of the main shaft 3. For the side shafts 4, when the height of the main shaft 3 is adjusted, the height also needs to be adjusted together, so a horizontal adjustment mechanism is provided accordingly:

[0036] As shown in the attached figure of the instruction manual Figure 1 — Figure 5 As shown, the horizontal adjustment mechanism includes a sliding groove 17 provided on the back plate 5, a rotating shaft 18, a connecting rod 19 hinged to the side shaft 4 through the rotating shaft 18, sliding blocks 20 provided at both ends of the rotating shaft 18, and a locking mechanism provided at the end of the connecting rod 19;

[0037] One end of the side shaft 4 is hinged to the connecting block 2, and the other end is hinged to the connecting rod 19, so that the side shaft 4 can rotate at the two hinge points of the connecting block 2 and the connecting rod 19. When the height of the device changes, the side shaft 4 also needs to be adjusted according to the position change. If the height is adjusted only by adjusting the rotation angle of the side shaft 4, a dead point may appear at a certain position and it cannot move downward. Therefore, the hinge point position of the side shaft 4 and the connecting rod 19 needs to be changed accordingly, as follows: a sliding groove 21 adapted to the sliding block 20 is provided inside the sliding groove 17. When the hinge point of the side shaft 4 and the connecting rod 19 moves, the sliding block 20 is driven to slide synchronously in the sliding groove 21. However, if only the position adjustment function is realized, the load resistance of the device will be reduced. For this purpose, a locking mechanism needs to be provided to control the horizontal distance between the connecting rod 19 and the sliding groove 17 through the locking mechanism.

[0038] As shown in the attached figure of the instruction manual Figure 1 — Figure 5 As shown, the locking mechanism includes a bidirectional threaded section 22 arranged at the end of the connecting rod 19, a fixing seat 23 arranged on the back plate 5, and a locking buckle 24 meshed with each thread of the bidirectional threaded section 22. The bidirectional threaded section 22 passes through the fixing seat 23. The bidirectional threaded section 22 is two sections of threads with opposite rotation directions, divided into a right-handed section and a left-handed section. Each section is provided with a corresponding locking buckle 24. The locking is performed by utilizing the self-locking property of the thread. The locking is performed by utilizing the pre-tightening force when the locking buckle 24 meshes with the bidirectional threaded section 22, that is, the two locking buckles 24 are screwed in the center, and the connecting rod 19 is limited to the fixing seat 23 by the pre-tightening force of the thread, and the bidirectional threaded section 22 does not contact the fixing seat 23. In order to facilitate the screwing of the locking buckle 24, an insertion hole is provided on the locking buckle 24. After inserting the socket wrench, it can be rotated according to the rotation direction of the thread. When it is necessary to change the position of the hinge point between the side shaft 4 and the connecting rod 19, insert the socket wrench into the insertion hole and screw the locking buckle 24 of the left and right threaded sections to a loose state, then rotate the locking buckle 24 of the threaded section along the adjustment direction until the target position of the connecting rod 19 to be adjusted is reached, and then rotate the locking buckle 24 of the threaded section in the other direction to follow up, and then the connecting rod 19 is limited on the fixed seat 23 by the two locking buckles 24.

[0039] After the height position of the protective helmet 1 is determined by the horizontal and vertical adjustment structures, the device needs to be worn on the wearer, and it is necessary to ensure that after wearing, the wearer's head maintains a certain distance from the protective helmet 1. At the same time, it is also necessary to ensure that the patient's shoulders do not move relative to the head of the protective helmet 1, and the upper part of the patient's torso is limited to the back plate 5 to prevent the upper part of the patient's torso from moving relative to the entire device. In order to fix the device, further improvements are made: as shown in the attached figure of the specification Figure 1 — Figure 3As shown, two shoulder straps 25 and two chest straps 26 are provided on the back panel 5. The front end of the chest strap 26, the top of the chest strap 26 and the shoulder strap 25 are all provided with quick-release buckles 27. The quick-release buckle 27 includes a fixed end and a plug-in end. The plug-in end is inserted into the fixed end, and then the fixed end limits the plug-in end inside. When removal is required, it can be quickly disassembled, and the circumference size can also be adjusted. The quick-release buckle 27 at the front end of the chest strap 26 fixes the wearer's chest to the back plate 5, and then the shoulder strap 25 is buckled with the quick-release buckle 27 on the top of the chest strap 26, so that the shoulders and chest are also fixed to the back plate 5. There is no relative movement between the wearer and the entire device, so that after the device is worn, the helmet 1 and the main shaft 3, the side shaft 4, etc. can support the head and neck, and protect the wearer's head and neck together. The shoulder straps 25 and the chest strap 26 convert the overall load-bearing point of the device to the wearer's chest and shoulders. Compared with the fragile neck and shoulders, the chest and shoulders have stronger impact resistance and better fixing effect, so that no matter whether it is falling objects from high altitude or the wearer falls from high altitude, the wearer's head and neck can be protected together.

[0040] This device is worn on the back of the user, and it is necessary to reduce the weight of the device to reduce the load on the user and meet the support strength of the material, so the above-mentioned main force-bearing components and supporting components should be supported by high-strength materials, including at least: helmet 1, back plate 5, side shaft 4, main shaft 3, sliding groove 17, locking buckle 24, fixed seat 23, transmission seat 7, rotating shaft 18, connecting rod 19, locking buckle 24, worm segment 9. The above-mentioned high-strength materials include Kevlar material. Kevlar is an aromatic polyamide fiber material developed by DuPont (DuPont) of the United States, and its chemical name is poly(p-phenylene terephthalamide). Kevlar material has excellent mechanical properties, light weight, high strength, wear resistance and corrosion resistance.

[0041] Detailed instructions for use:

[0042] S1, buckle the two chest straps 26 together, and buckle the two shoulder straps 25 and the chest strap 26 together, and adjust them according to the height position of the wearer's head and the protective helmet 1;

[0043] S2, insert the socket wrench into the insertion hole to screw the locking buckle 24 of the meshing left and right threaded sections to a relaxed state, and then rotate the locking buckle 24 of the threaded section along the adjustment direction; then adjust the height of the main shaft 3, loosen the locking bolt 14, and rotate the knob 8 through the rotating shaft 6 to make the worm section 9 engage with the worm nut section 10, preliminarily adjust the height of the helmet 1, the main shaft 3 drives the side shaft 4 to rise through the connecting block 2, and at the same time, the two ends of the side shaft 4 rotate, and the connecting rod 19 hinged to the side shaft 4 through the rotating shaft 18 is displaced in the horizontal direction. After the rising height of the main shaft 3 reaches the target height, screw the locking bolt 14 so that the locking bolt 14 locks the rotating shaft 6, and insert the socket wrench into the insertion hole to tighten the locking buckle 24 of the meshing left and right threaded sections.

[0044] To sum up, this device is used to protect the wearer's head and neck, avoid the impact of falling objects on the wearer's cervical spine, and prevent soldiers from neck injuries due to non-standard movements during parachute training. This device supports the wearer's head and neck, and can achieve good support effects from multiple directions, reducing injuries to the patient's head and neck, and plays a role in protecting the cervical spine and head. In addition, the adjustment process of this device is convenient and fast, and it can be suitable for wearers of different body shapes.

Claims

1. A support and adjustment device for a head and neck protection device, characterized in that: The protective helmet (1) comprises a connecting block (2) arranged at the rear side of the protective helmet (1), a main shaft (3) connected to the connecting block (2), two side shafts (4) symmetrically arranged with respect to the main shaft (3), a back plate (5), and a plurality of adjustment mechanisms arranged on the back plate (5); The side shaft (4) is rotatably connected to the fixed block, and the multiple adjustment mechanisms are used to adjust the vertical heights of the main shaft (3) and the side shaft (4) respectively, thereby controlling the position of the helmet and the wearer's head.

2. The support and adjustment device for a head and neck protection device according to claim 1, characterized in that: The adjustment mechanism includes two horizontal adjustment mechanisms and a vertical adjustment structure; The vertical adjustment structure comprises a displacement adjustment mechanism and a reinforcement member arranged at the bottom of the main shaft (3); The displacement adjustment mechanism comprises a rotating shaft (6) matched with the bottom of the main shaft (3), a transmission seat (7) arranged on the back plate (5), and a knob (8) arranged at the bottom of the rotating shaft (6); a worm section (9) is arranged at the bottom of the rotating shaft (6), a worm bar section (10) matched with the worm section (9) is arranged in the transmission seat (7), and the rotating knob (8) meshes with the worm bar through the worm, thereby driving the main shaft (3) to move.

3. The support and adjustment device for a head and neck protection device according to claim 2, characterized in that: The reinforcing member is arranged at the connection between the main shaft (3) and the rotating shaft (6); the reinforcing member is used to connect the main shaft (3) and the rotating shaft (6); and when the rotating shaft (6) rotates, the main shaft (3) does not rotate.

4. The support and adjustment device for a head and neck protection device according to claim 3, characterized in that: The mating end of the rotating shaft (6) and the main shaft (3) is provided with a connecting shaft (11), the main shaft (3) is provided with a connecting hole adapted to the connecting shaft (11), and the reinforcing member comprises a connecting sleeve (12), a bearing (13) arranged in cooperation with the inside of the connecting sleeve (12), a locking hole arranged on the connecting sleeve (12), a locking bolt (14) matched with the locking hole, and a limiting seat (15) arranged on the back plate (5); The limiting seat (15) cooperates with the main shaft (3), the outer diameter of the bearing (13) is matched with the connecting sleeve (12), the inner diameter of the bearing (13) is matched with the diameter of the connecting shaft (11), the rotating shaft (6) is provided with a clearance groove (16), the clearance groove (16) is matched with the locking hole, and the locking bolt (14) acts on the rotating shaft (6) after being screwed.

5. A support and adjustment device for a head and neck protection device according to claim 2 or 4, characterized in that: The horizontal adjustment mechanism comprises a sliding groove (17) arranged on the back plate (5), a rotating shaft (18), a connecting rod (19) hinged to the side shaft (4) through the rotating shaft (18), sliding blocks (20) arranged at both ends of the rotating shaft (18), and a locking mechanism arranged at the end of the connecting rod (19); The sliding groove (17) is provided with a sliding groove (21) adapted to the sliding block (20) inside, and the horizontal distance between the connecting rod (19) and the sliding groove (17) is controlled by a locking mechanism, thereby controlling the vertical distance of the side shaft (4).

6. The support and adjustment device for a head and neck protection device according to claim 5, characterized in that: The locking mechanism comprises a bidirectional threaded section (22) arranged at the end of the connecting rod (19), a fixing seat (23) arranged on the back plate (5), and a locking buckle (24) meshed with each thread of the bidirectional threaded section (22).

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