Locking mechanism for helmet and helmet thereof

Abstract

The utility model discloses a locking mechanism for a helmet, relates to the technical field of helmets, solves the problem of mutual friction between a pawl and an inner ratchet wheel when the locking mechanism of the helmet is unlocked, and adopts the technical scheme that the locking mechanism for the helmet is characterized in that the inner ratchet wheel matched with the pawl is arranged on a fixed frame; first abutting blocks are arranged on the two pawls respectively, second abutting blocks corresponding to the first abutting blocks are arranged on the rotary knob assembly, and when the rotary knob assembly does not rotate, the inner ratchet wheel and the pawls are matched with each other to limit forward and reverse rotation of the rotary knob assembly; when the knob assembly rotates forwards or backwards, the knob assembly rotates by a certain angle relative to the control piece, so that the second abutting block abuts against the first abutting block, the clamped pawl is driven to deform and break away from the inner ratchet wheel, and the limiting assembly enables the knob assembly to drive the control piece to rotate forwards or backwards. According to the utility model, mutual friction between the pawl and the inner ratchet wheel when the locking mechanism is unlocked is mainly avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of helmets, in particular to a locking mechanism for a helmet and a helmet thereof. Background Art

[0002] When wearing a helmet, it is necessary to keep the helmet and the head tightly connected to prevent the helmet and the head from being separated when subjected to mechanical impact, and the helmet cannot play a protective role. At present, the means of connecting the helmet to the head include adjusting buckles, buckles, and even simple tightening ropes. Most of these methods use flexible connecting ropes to adjust their lengths to adapt to the head circumference, thereby realizing the head circumference band fixing and tightness adjustment. In the process of adjusting and wearing the helmet, the existing helmet needs to adjust the fastening belt of the helmet to prevent the helmet from falling off. During the adjustment process, the user often needs to adjust for a long time, which wastes time and cannot quickly and stably bind and fix the helmet to the user's head. It is inconvenient to adjust the tightness of the side hoop of the helmet (safety helmet), and it is impossible to achieve fitting with the head. The existing adjustment structure cannot achieve self-locking, and the straps cannot be fixed well when adjusting the tightness, which affects the adjustment effect. In addition, when the existing adjustment device adjusts the straps, the straps often protrude to the outside of the helmet, and cannot be close to the two sides of the helmet, which affects the aesthetics and practicality of the helmet.

[0003] The locking structure used in the helmet in the prior art forces the pawl to rotate in the opposite direction of the inner ratchet, causing the extrusion between the pawl and the inner ratchet to deform, thereby reversing the knob assembly to achieve the purpose of loosening, and when the pawl disengages from the ratchet and rotates, friction between the two will occur, resulting in wear between the pawl and the inner ratchet after long-term work. Utility Model Content

[0004] The utility model aims to provide a locking mechanism for a helmet, which solves the problem that the pawl and the inner ratchet wheel rub against each other when the locking mechanism of the helmet is unlocked, and effectively avoids the pawl and the inner ratchet wheel rubbing against each other when the locking mechanism is unlocked.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a locking mechanism for a helmet, comprising a fixing frame, a knob assembly and two elastic bands, the elastic bands are provided with a rack, the knob assembly is rotatably connected to the fixing frame, and the elastic bands are slidably connected to the fixing frame, characterized in that a transmission member is rotatably connected to the knob assembly, a limit assembly is provided between the knob assembly and the transmission member, the transmission member comprises a gear, an elastic pawl arranged on the outside of the gear and arranged oppositely, and a first abutment block arranged on one side of the pawl, the gear is meshed with the rack and drives the two elastic bands to move The fixing frame is provided with an inner ratchet matched with the pawl, and the two pawls are respectively provided with a first abutment block, and the knob assembly is provided with a second abutment block corresponding to the first abutment block. When the knob assembly does not rotate, the inner ratchet and the pawl cooperate with each other to limit the forward and reverse rotation of the knob assembly; when the knob assembly rotates, the knob assembly has a first stroke of idling relative to the transmission member, and a second stroke of synchronous rotation of the transmission member driven by the limit assembly. In the first stroke, the second abutment block abuts against the first abutment block to deform the pawl and disengage from the inner ratchet. In the second stroke, the transmission member rotates to drive the rack to move to adjust the elastic band.

[0006] After adopting the above technical scheme, the utility model has the following advantages: when the knob assembly does not rotate, due to the cooperation of the pawls and the inner ratchet in two opposite directions, the transmission member cannot rotate forward or backward, nor can it rotate in the way of driving the gear on the transmission member through the rack on the elastic band, thereby ensuring the stability of the locking mechanism; when the knob assembly is rotated forward or reversely, the second abutment block on the knob assembly drives the first abutment block to move, and after the first abutment block drives the stuck pawl to deform and disengage from the inner ratchet, the limiting assembly rotates the knob assembly and the transmission member together, so that the transmission member can rotate forward or reverse synchronously with the knob assembly, and when the transmission member rotates, the gear on the transmission member meshes with the rack on the elastic band, thereby driving the elastic band The elastic bands are loosened when they move away from each other, or are driven closer to each other and tightened to adapt to the head circumference of different users. Compared with the traditional elastic device, the pawl is forced to rotate against the direction of the inner ratchet, causing the extrusion between the pawl and the inner ratchet to deform, thereby reversing the knob assembly to achieve the purpose of loosening, and when the pawl disengages from the ratchet wheel, friction between the two sides will occur, resulting in wear between the pawl and the inner ratchet after long-term work. The present invention first abuts the second abutment block on the knob assembly with the corresponding first abutment block on the pawl, so that the pawl is deformed and disengaged from the inner ratchet, so that the pawl will not be squeezed between the inner ratchet, the friction between the pawl and the inner ratchet is reduced, and the life of the pawl and the inner ratchet is increased.

[0007] Furthermore, the limit assembly includes a limit block and a corresponding limit groove. One of the knob assembly and the transmission member is provided with a limit block, and the other is provided with a limit groove. When the knob assembly is rotated by a certain angle, the second abutment block on the knob assembly drives the corresponding first abutment block on the pawl to move until the pawl is deformed and disengaged from the inner ratchet, and then the side surface of the limit block abuts against the side wall of the limit groove, so that the transmission member and the knob assembly rotate together.

[0008] By adopting the above-mentioned technical solution and designing the size of the limit groove, after the knob assembly is rotated by a certain angle, the second abutment block on the knob assembly drives the corresponding first abutment block on the pawl to move, until the stuck pawl is deformed and disengaged from the inner ratchet, the side surface of the limit block will abut against the side wall of the limit groove, so that the transmission part and the knob assembly rotate together, avoiding friction between the pawl and the inner ratchet and increasing the life of the pawl and the inner ratchet.

[0009] Furthermore, the pawl is a cantilever structure, one end of which is fixed to the side of the gear, and the other end is a cantilever end, and the first abutment block is arranged on the cantilever end.

[0010] By adopting the above-mentioned technical solution, the cantilever structure is more convenient to install than the pawl structure using a spring, etc., and a first abutment block is set at the cantilever end. Because the force arm is longer, the deformation is larger when the pawl is subjected to less force, and it is easier to detach from the ratchet, making it more convenient to operate.

[0011] Furthermore, the first abutment block is provided with a first abutment surface, which is an inclined surface that gradually moves away from the corresponding second abutment block radially outward, and when the first abutment surface abuts against the second abutment block, the pawl can be retracted inward to disengage from the inner ratchet.

[0012] By adopting the above technical solution, the second abutting block drives the first abutting block to move by abutting the first abutting surface, so that the contact between the first abutting block and the second abutting block is more gentle, thereby increasing the service life of the first abutting block and the second abutting block.

[0013] Furthermore, the second abutting block is provided with a second abutting surface, the second abutting surface is an arc, and the second abutting surface abuts against the first abutting surface.

[0014] By adopting the above technical solution, the second abutting surface abuts against the first abutting surface, so that the contact between the first abutting block and the second abutting block is more moderate, thereby increasing the service life of the first abutting block and the second abutting block.

[0015] Furthermore, the knob assembly includes a mounting seat and a knob cover, the mounting seat and the knob cover are fixedly connected, the transmission member is rotatably connected to the mounting seat, and the mounting seat is rotatably connected to the fixing frame.

[0016] With the aforementioned technical solution, since the knob cover and the mounting base are fixedly connected, the user can control the rotation of the knob assembly by rotating the knob cover, thereby better controlling the parts installed on the mounting base.

[0017] Furthermore, the knob cover includes a body and a cover surface, the body is fixed to the mounting seat by bolts, and the cover surface is connected to the body by snaps.

[0018] By adopting the above-mentioned technical solution, the knob cover body is fixed to the mounting seat by bolts, which is convenient for disassembly and replacement. The cover is connected to the body by snap-on buckles, which hides the bolts on the body and makes the body more beautiful.

[0019] Furthermore, the cover surface is provided with friction strips extending in the axial direction distributed in the circumferential direction on the side surface.

[0020] With the above technical solution, the user operates the knob assembly by holding the friction strip. Since the extension direction of the friction strip is perpendicular to the rotation direction, it is more convenient for the user to operate the knob assembly.

[0021] A helmet comprises a helmet shell, wherein the locking mechanism is arranged at the rear and the upper part of the helmet shell.

[0022] By adopting the above-mentioned technical solution, the head circumference of the helmet can be controlled by the locking mechanism at the rear of the helmet shell, making the helmet shell more stable to wear, and the top height of the helmet shell can be controlled by the locking mechanism at the top of the helmet shell, making the top of the helmet shell closer to the user's head and increasing comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described below in conjunction with the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of a locking mechanism for a helmet according to the utility model;

[0025] Figure 2 It is the assembly front view of the fixing frame, locking piece and mounting seat;

[0026] Figure 3 A three-dimensional diagram of the locking member and the mounting seat;

[0027] Figure 4 Two sets of exploded views of the fixing frame, locking member and mounting base;

[0028] Figure 5 A schematic diagram of a locking mechanism for a helmet being applied to the helmet;

[0029] Figure 6 Diagram of removing the knob cover for the locking mechanism on the helmet;

[0030] Figure 7A three-dimensional schematic diagram of the gear rack in the helmet shell.

[0031] Description of the drawings: 1. Helmet shell; 2. Locking mechanism; 21. Fixing frame; 211. Inner ratchet; 22. Knob assembly; 221. Second abutment block; 222. Mounting seat; 223. Knob cover; 224. Cover surface; 225. Bolt; 226. Friction strip; 23. Elastic band; 231. Rack; 24. Transmission member; 241. Gear; 242. Ratchet; 243. First abutment block; 244. First abutment surface; 245. Second abutment surface; 3. Limiting assembly; 31. Limiting block; 32. Limiting groove. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0033] The terms "first", "second", etc. (if any) in the specification and claims of the present utility model are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily mean that it has "first". It should be understood that in the present utility model, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in the present utility model, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0034] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0035] like Figures 1 to 7As shown, the utility model provides a locking mechanism 2 for a helmet, comprising a fixing frame 21, a knob assembly 22 and two elastic bands 23, wherein a rack 231 is provided on the elastic band 23, the knob assembly 22 is rotatably connected to the fixing frame 21, and the elastic band 23 is slidably connected to the fixing frame 21, and is characterized in that a transmission member 24 is rotatably connected to the knob assembly 22, a limiting assembly 3 is provided between the knob assembly 22 and the transmission member 24, the transmission member 24 comprises a gear 241, an elastic pawl 242 arranged on the outer side of the gear 241 and arranged oppositely, and a first abutting block 243 arranged on one side of the pawl 242, a limiting assembly 3 is provided between the transmission member 24 and the knob assembly 22, the gear 241 is meshed with the rack 231 and drives the two elastic bands 23 to move The fixing frame 21 is provided with an inner ratchet 211 matched with the pawl 242, and the two pawls 242 are respectively provided with a first abutment block 243, and the knob assembly 22 is provided with a second abutment block 221 corresponding to the first abutment block 243. When the knob assembly 22 does not rotate, the inner ratchet 211 and the pawl 242 cooperate with each other to limit the forward and reverse rotation of the knob assembly 22; when the knob assembly 22 rotates, the knob assembly 22 has a first stroke in which the transmission member 24 rotates idly relative to the transmission member 24, and a second stroke in which the transmission member 24 is driven to rotate synchronously through the limit assembly 3. In the first stroke, the second abutment block 221 abuts against the first abutment block 243 to deform the pawl 242 and disengage from the inner ratchet 211. In the second stroke, the transmission member 24 rotates to drive the rack 231 to move to adjust the elastic band 23.

[0036] After adopting the above technical scheme, the utility model has the following advantages: when the knob assembly 22 does not rotate, due to the cooperation between the pawl 242 and the inner ratchet 211, the transmission member 24 cannot rotate forward or reverse, nor can the gear 241 on the transmission member 24 be driven to rotate by the rack 231 on the elastic band 23, thereby ensuring the stability of the locking mechanism 2; through the forward or reverse rotation of the knob assembly 22, the second abutment block 221 on the knob assembly 22 drives the first abutment block 243 to move, and after the first abutment block 243 drives the stuck pawl 242 to deform and disengage from the inner ratchet 211, the limiting assembly 3 then rotates the knob assembly 22 and the transmission member 24 together, so that the transmission member 24 can rotate forward or reverse synchronously with the knob assembly 22, and when the transmission member 24 rotates, the gear 241 on the transmission member 24 meshes with the rack 231 on the elastic band 23, thereby driving the elastic band 23 to rotate with each other The pawl 242 is moved away from and relaxed, or the elastic band 23 is driven closer to and tightened to adapt to the head circumference of different users. Compared with the traditional elastic device, the pawl 242 is forced to rotate against the direction of the inner ratchet 211, so that the extrusion between the pawl 242 and the inner ratchet 211 is deformed, so that the knob assembly 22 is reversed to achieve the purpose of loosening, and when the pawl 242 disengages from the ratchet and rotates, the two sides will cause friction, resulting in wear between the pawl 242 and the inner ratchet 211 after long-term work. In this scheme, the second abutment block 221 on the knob assembly 22 and the corresponding first abutment block 243 on the pawl 242 are abutted, so that the pawl 242 is deformed and disengaged from the inner ratchet 211, so that the pawl 242 will not be squeezed with the inner ratchet 211, the friction between the pawl 242 and the inner ratchet 211 is reduced, and the life of the pawl 242 and the inner ratchet 211 is improved.

[0037] Furthermore, the limit assembly 3 includes a limit block 31 and a corresponding limit groove 32, the transmission member 24 is provided with a limit block 31, and the knob assembly 22 is provided with a limit groove 32. When the knob assembly 22 rotates a certain angle, the second abutment block 221 on the knob assembly 22 drives the corresponding first abutment block 243 on the pawl 242 to move until the pawl 242 is deformed and disengaged from the inner ratchet 211, and then the side surface of the limit block 31 abuts against the side wall of the limit groove 32, so that the transmission member 24 and the knob assembly 22 rotate together.

[0038] By adopting the above-mentioned technical solution, by designing the size of the limit groove 32, after the knob assembly 22 rotates a certain angle relative to the transmission member 24, the second abutment block 221 on the knob assembly 22 drives the corresponding first abutment block 243 on the pawl 242 to move, until the stuck pawl 242 is deformed and disengaged from the inner ratchet 211, the side of the limit block 31 will abut against the side wall of the limit groove 32, so that the transmission member 24 and the knob assembly 22 rotate together, avoiding the friction between the pawl 242 and the inner ratchet 211, and increasing the life of the pawl 242 and the inner ratchet 211.

[0039] Furthermore, the pawl 242 is a cantilever structure, one end of which is fixed to the side of the gear 241 , and the other end of which is a cantilever end and the first abutting block 243 is disposed at the cantilever end.

[0040] By adopting the above-mentioned technical solution, a cantilever structure is more convenient to install than a structure using a spring, and a first abutment block 243 is set at the cantilever end. Because the force arm is longer, the deformation amount is larger when the pawl 242 is subjected to less force, and it is easier to disengage from the ratchet 211, making it more convenient to operate.

[0041] Furthermore, the first abutment block 243 is provided with a first abutment surface 244 , which is an inclined surface that gradually moves radially outward away from the corresponding second abutment block 221 . When the first abutment surface 244 abuts against the second abutment block 221 , the pawl 242 can be retracted inward to disengage from the inner ratchet 211 .

[0042] By adopting the above technical solution, the second abutting block 221 drives the first abutting block 243 to move by abutting the first abutting surface 244, so that the contact between the first abutting block 243 and the second abutting block 221 is more moderate, thereby increasing the service life of the first abutting block 243 and the second abutting block 221.

[0043] Furthermore, the second abutting block 221 is provided with a second abutting surface 245 , the second abutting surface 245 is an arc, and the second abutting surface 245 abuts against the first abutting surface 244 .

[0044] By adopting the above technical solution, the second abutting surface 245 abuts against the first abutting surface 244 , so that the contact between the first abutting block 243 and the second abutting block 221 is more moderate, thereby increasing the service life of the first abutting block 243 and the second abutting block 221 .

[0045] Furthermore, the knob assembly 22 includes a mounting seat 222 and a knob cover 223 , the mounting seat 222 and the knob cover 223 are fixedly connected, the transmission member 24 is rotatably connected to the mounting seat 222 , and the mounting seat 222 is rotatably connected to the fixing frame 21 .

[0046] With the aforementioned technical solution, since the knob cover 223 and the mounting base 222 are fixedly connected, the user can control the rotation of the knob assembly 22 by rotating the knob cover 223 , thereby better controlling the parts mounted on the mounting base 222 .

[0047] Furthermore, the knob cover 223 includes a body and a cover surface 224 . The body is fixed to the mounting seat 222 by bolts 225 , and the cover surface 224 is connected to the body by snaps.

[0048] By adopting the above-mentioned technical solution, the knob cover 223 body is fixed to the mounting base 222 by bolts 225, which is convenient for disassembly and replacement. The cover surface 224 is snap-connected to the body to cover the bolts 225 on the body, making the body more beautiful.

[0049] Furthermore, the cover surface 224 has friction strips 226 distributed circumferentially on the side surface and extending in the axial direction.

[0050] With the aforementioned technical solution, the user operates the knob assembly 22 by holding the friction strip 226 . Since the extension direction of the friction strip 226 is perpendicular to the rotation direction, it is more convenient for the user to operate the knob assembly 22 .

[0051] A helmet comprises a helmet shell 1, wherein the locking mechanism 2 is provided at the rear and the upper part of the helmet shell 1.

[0052] By adopting the above-mentioned technical solution, the head circumference of the helmet shell 1 can be controlled by the locking mechanism 2 at the rear of the helmet shell 1, so that the helmet shell 1 is more stable to wear, and the top height of the helmet shell 1 can be controlled by the locking mechanism 2 at the top of the helmet shell 1, so that the top of the helmet shell 1 is closer to the user's head, thereby increasing comfort.

[0053] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A locking mechanism for a helmet, comprising a fixing frame (21), a knob assembly (22) and two elastic bands (23), wherein the elastic bands (23) are provided with a rack (231), the knob assembly (22) is rotatably connected to the fixing frame (21), and the elastic bands (23) are slidably connected to the fixing frame (21), characterized in that: The knob assembly (22) is rotatably connected to a transmission member (24), a limiting assembly (3) is provided between the knob assembly (22) and the transmission member (24), the transmission member (24) comprises a gear (241), an elastic pawl (242) arranged on the outer side of the gear (241) and arranged opposite to each other, and a first abutment block (243) arranged on one side of the pawl (242), a limiting assembly (3) is provided between the transmission member (24) and the knob assembly (22), the gear (241) is meshed with the rack (231) and drives the two elastic bands (23) to move, an inner ratchet (211) adapted to the pawl (242) is provided on the fixing frame (21), and the two pawls (242) are respectively provided with a first abutment block (243), The knob assembly (22) is provided with a second abutment block (221) corresponding to the first abutment block (243). When the knob assembly (22) does not rotate, the inner ratchet (211) and the pawl (242) cooperate with each other to limit the forward and reverse rotation of the knob assembly (22); when the knob assembly (22) rotates, the knob assembly (22) has a first stroke of idling relative to the transmission member (24), and a second stroke of synchronous rotation driven by the limiting assembly (3) of the transmission member (24). In the first stroke, the second abutment block (221) abuts against the first abutment block (243) so that the pawl (242) is deformed and separated from the inner ratchet (211). In the second stroke, the transmission member (24) rotates to drive the rack (231) to move to adjust the elastic band (23).

2. A locking mechanism for a helmet according to claim 1, characterized in that: The limit assembly (3) comprises a limit block (31) and a matching limit groove (32); one of the knob assembly (22) and the transmission member (24) is provided with a limit block (31), and the other is provided with a limit groove (32); when the knob assembly (22) rotates a certain angle, the second abutting block (221) on the knob assembly (22) drives the corresponding first abutting block (243) on the pawl (242) to move until the pawl (242) is deformed and disengaged from the inner ratchet (211), and then the side surface of the limit block (31) abuts against the side wall of the limit groove (32), so that the transmission member (24) and the knob assembly (22) rotate together.

3. A locking mechanism for a helmet according to claim 1, characterized in that: The ratchet pawl (242) is a cantilever structure, one end of which is fixed to the side of the gear (241), and the other end of which is a cantilever end, and the first abutment block (243) is arranged on the cantilever end.

4. A locking mechanism for a helmet according to claim 1, characterized in that: The first abutment block (243) is provided with a first abutment surface (244), and the first abutment surface (244) is an inclined surface that gradually moves away from the corresponding second abutment block (221) radially outward. When the first abutment surface (244) abuts against the second abutment block (221), the ratchet pawl (242) can be retracted inward to disengage from the inner ratchet (211).

5. A locking mechanism for a helmet according to claim 1, characterized in that: The second abutment block (221) is provided with a second abutment surface (245), the second abutment surface (245) is an arc, and the second abutment surface (245) abuts against the first abutment surface (244).

6. A locking mechanism for a helmet according to claim 1, characterized in that: The knob assembly (22) comprises a mounting seat (222) and a knob cover (223); the transmission member (24) is rotatably connected to the mounting seat (222); and the mounting seat (222) is rotatably connected to the fixing frame (21).

7. A locking mechanism for a helmet according to claim 6, characterized in that: The knob cover (223) comprises a body and a cover surface (224); the mounting seat (222) and the knob cover (223) are fixedly connected; the body is fixed to the mounting seat (222) by bolts (225); and the cover surface (224) is connected to the body by snap fastening.

8. A locking mechanism for a helmet according to claim 7, characterized in that: The cover surface (224) is provided with friction strips (226) extending in the axial direction distributed in the circumferential direction of the side surface.

9. A helmet, comprising a helmet shell (1), characterized in that: The locking mechanism (2) for the helmet as claimed in claim 1 is provided at the rear and upper parts of the helmet shell (1).

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