Protective helmet and its adapter

Abstract

This application relates to a protective helmet and an adapter therefor. The adapter comprises a cantilever that is non-rotatably mounted to a headgear for a protective helmet, an adjustment member that is at least partially mounted in a seat of the cantilever and is non-rotatable relative to the helmet housing, and a position limiting member mounted in a seat of the cantilever, wherein a guide limiting structure is provided between the position limiting member and the adjustment member to prevent the helmet housing from rotating further away from the upward direction relative to the headgear when the helmet housing is in the flipped-down position. The position limiting member is configured to be selectively switchable between a locked state in which the position limiting member is non-rotatable about a pivot axis relative to the seat, and an unlocked state in which the position limiting member is rotatable about a pivot axis relative to the seat.

Description

Technical Field

[0003]

[0001] The present application generally relates to protective helmets, particularly welding helmets, and adapters provided on protective helmets.

Background Art

[0002] In welding, an operator is obliged to wear a welding helmet on the head, thereby preventing the intense light emitted at the moment of the generation of the welding arc from harming the operator's eyes, and / or preventing the spatter generated during welding from contacting the operator's face and causing damage. Usually, a welding helmet is provided with a viewing window at a position where it can protect the eyes of a person wearing the welding helmet on the head. The viewing window can be embodied as a dark glass plate, a dark arc light protection sheet, or an automatic light-shielding filter configured to automatically darken at the moment of the generation of the welding arc. The welding helmet can be attached to the head of a welding operator via a headgear. The headgear can be directly worn and fixed on the head of the welding operator. An adapter for connecting the welding helmet to the headgear is provided on each of the left and right sides of the headgear. The adapter is configured such that, when the user is already wearing the headgear, the welding helmet can rotate about a rotation axis, whereby it can be switched between a flipping-down position where the welding helmet protects the user's face and a flipping-up position where the user's face is exposed. In the flipping-down position, the user can only view the outside through the viewing window of the welding helmet.

[0003] A single welding helmet may be provided to be worn by multiple users with different head sizes or shapes. When a headgear is fixed to the head of each user with different head sizes or shapes, the field of view each user sees when the welding helmet is switched to the flipped-down position may differ from that of the other. This is because, when the welding helmet is in the flipped-down position, the eyes of different users with different head sizes or shapes may be misaligned with the viewing window of the welding helmet. If such a situation occurs, it may impair visibility through the welding helmet and potentially negatively affect the welding work. In addition, the same user wearing a welding helmet to perform welding work may adopt different viewing postures, such as looking horizontally, looking upwards, or looking downwards. As a result, the user's field of view may not properly pass through the viewing window of the welding helmet in the flipped-down position, and the user may not be able to see outside through the viewing window.

[0004] Similar problems can arise not only in the field of welding, but also in protective helmets used in other fields, if the protective helmet is attached or secured to the user's head via headgear (for example, if such a protective helmet also has a viewing window that allows the user to see outside). [Overview of the project] [Problems that the invention aims to solve]

[0005] The primary objective of this invention is to propose an improved protective helmet that is easily adjustable so that the rotation angle of the protective helmet relative to the headgear can be changed when the protective helmet is in the flipped-down position while the user is wearing the protective helmet via the headgear. [Means for solving the problem]

[0006] According to one perspective, this application is, Headgear and Helmet housing and A protective helmet comprising an adapter connected between the headgear and the helmet housing, wherein the helmet housing is selectively rotatable about a pivot axis relative to the headgear, thereby allowing switching between a flipped-down position and a flipped-up position, the adapter including an adapter configured to define the flipped-down position of the helmet housing, The adapter, configured to define the downward position of the helmet housing, A cantilever is attached to the above headgear in a way that prevents rotation, An adjustment member that is detachably connected to the helmet housing and is not rotatable relative to the helmet housing, wherein at least a portion of the adjustment member is mounted within the seat of the cantilever, The cantilever comprises a position limiting member mounted within the receiving seat of the cantilever, Between the position limiting member and the adjustment member, a guide limiting structure is provided to prevent the helmet housing from further rotating away from the upward direction relative to the headgear when the helmet housing is in the downward position. The proposed protective helmet is configured such that the position limiting member can be selectively switched between a locked state in which the position limiting member cannot rotate around the pivot axis relative to the receiving seat, and an unlocked state in which the position limiting member can rotate around the pivot axis relative to the receiving seat.

[0007] In one embodiment, the position limiting member is configured to be switched between the locked state and the unlocked state by axial movement of the position limiting member within the receiving seat.

[0008] In one embodiment, the adjustment member comprises a disc-shaped body and a guide column extending substantially parallel to the pivot axis from the disc-shaped body, the position limiting member comprises a circumferential guide groove configured to accommodate and guide the guide column, and the guide limiting structure comprises the guide column and a limiting stop portion located at the endpoint of the circumferential guide groove.

[0009] In one embodiment, the adjustment member further comprises a hollow cylinder extending coaxially with the pivot axis from the disc-shaped body on the opposite side from the guide column, the hollow cylinder passing through the housing wall of the helmet housing in a non-rotatable manner relative to the helmet housing and being detachably connected to a rotary knob, the receiving seat and the housing wall of the helmet housing being held axially between the disc-shaped body and the rotary knob.

[0010] In one embodiment, the adjustment member further comprises a sleeve extending from the disc-shaped body to the same side as the guide column, the sleeve being coaxial with the hollow cylinder and radially separated from the guide column, the position limiting member comprising an inner cylinder and an outer cylinder being coaxial with each other, the circumferential guide groove being defined between the inner cylinder and the outer cylinder, and the sleeve being inserted into the inner cylinder within the receiving seat.

[0011] In one embodiment, one or more teeth are formed circumferentially on the cylindrical inner wall of the receiving seat, and an annular external tooth row is formed on the outer cylinder of the position limiting member, and the one or more teeth can engage with the corresponding teeth of the annular external tooth row only when the position limiting member is in the locked state, thereby preventing the position limiting member from rotating relative to the receiving seat.

[0012] In one embodiment, an annular tooth array is formed on the cylindrical inner wall of the receiving seat, and one or more external teeth are formed circumferentially on the outer cylinder of the position limiting member, and the one or more external teeth can engage with the corresponding teeth of the annular tooth array only when the position limiting member is in the locked state, thereby preventing the position limiting member from rotating relative to the receiving seat.

[0013] In one embodiment, an annular tooth row is formed around the sleeve on the disc-shaped body, and an annular tooth row is formed at the free end of the inner cylinder, and only in the unlocked state, the annular tooth row of the position limiting member can engage with the corresponding teeth of the annular tooth row of the adjusting member, thereby enabling the position limiting member to be driven by the adjusting member within the receiving seat and rotate around the pivot axis.

[0014] In one embodiment, an elastic element is placed inside the sleeve to provide a restoring force that causes the position limiting member to return from the unlocked state to the locked state.

[0015] In one embodiment, a bolt passes through the disc-shaped body and is screwed into a fixing cylinder for the position limiting member, thereby defining the axial distance of the position limiting member relative to the disc-shaped body when the position limiting member is in the locked state.

[0016] In one embodiment, the fixing member is provided on the housing wall of the helmet housing so as not to rotate around the pivot axis, and the hollow cylinder is configured to pass through the central hole of the fixing member so as not to rotate around the pivot axis.

[0017] In one embodiment, a washer member is fitted to the outer circumference of the hollow cylinder, which is clamped axially between the housing wall of the helmet housing and the rotating knob.

[0018] In one embodiment, an internal thread is formed on the inner wall of the hollow cylinder, which engages with the threaded stud of the rotary knob.

[0019] In one embodiment, the guiding posts include two guiding posts that are arranged radially symmetrically with respect to each other around the rotation axis, and the guiding grooves include two guiding grooves that are arranged radially symmetrically with respect to each other around the rotation axis.

[0020] In one embodiment, the limiting stop portion includes a connecting portion that extends integrally in the radial direction between the inner cylinder and the outer cylinder.

[0021] In one embodiment, the protective helmet is a welding helmet. <000008​​​​​​​​​​​​​​​​In one embodiment, the position limiting member is configured to be switched between the locked state and the unlocked state by axial movement of the position limiting member within the receiving seat.

[0024] In one embodiment, the adjusting member includes a disc-shaped main body and a guide post extending substantially parallel to the rotation axis from the disc-shaped main body. The position limiting member includes a circumferential guide groove configured to accommodate and guide the guide post. The guiding and limiting structure includes the guide post and a limiting stop portion located at an end point of the circumferential guide groove.

[0025] In one embodiment, the adjusting member further includes a hollow cylinder extending coaxially with the rotation axis from the disc-shaped main body on the side opposite to the guide post. The hollow cylinder is provided with an end portion configured to penetrate through the housing wall of the helmet housing and be detachably connected to a rotary knob.

[0026] In one embodiment, the adjusting member further includes a sleeve extending from the disc-shaped main body on the same side as the guide post. The sleeve is coaxial with the hollow cylinder and radially spaced apart from the guide post. The position limiting member includes an inner cylinder and an outer cylinder that are coaxial with each other. The circumferential guide groove is defined between the inner cylinder and the outer cylinder. The sleeve is inserted into the inner cylinder within the receiving seat.

[0027] In one embodiment, one or more teeth are formed to be circumferentially distributed on the cylindrical inner wall of the receiving seat, and an annular external tooth row is formed on the outer cylinder of the position limiting member. Only when the position limiting member is in the locked state, the one or more teeth can engage with corresponding teeth of the annular external tooth row, thereby preventing the position limiting member from rotating relative to the receiving seat.

[0028] In one embodiment, an annular tooth array is formed on the cylindrical inner wall of the receiving seat, and one or more external teeth are formed circumferentially on the outer cylinder of the position limiting member, and the one or more external teeth can engage with the corresponding teeth of the annular tooth array only when the position limiting member is in the locked state, thereby preventing the position limiting member from rotating relative to the receiving seat.

[0029] In one embodiment, an annular tooth row is formed around the sleeve on the disc-shaped body, and an annular tooth row is formed at the free end of the inner cylinder, and only in the unlocked state, the annular tooth row of the position limiting member can engage with the corresponding teeth of the annular tooth row of the adjusting member, thereby enabling the position limiting member to be driven by the adjusting member within the receiving seat and rotate around the pivot axis.

[0030] In one embodiment, an elastic element is placed inside the sleeve to provide a restoring force that causes the position limiting member to return from the unlocked state to the locked state.

[0031] In one embodiment, a bolt passes through the disc-shaped body and is screwed into a fixing cylinder for the position limiting member, thereby defining the axial distance of the position limiting member relative to the disc-shaped body when the position limiting member is in the locked state.

[0032] In one embodiment, an internal thread is formed on the inner wall of the hollow cylinder, which engages with the threaded stud of the rotary knob.

[0033] In one embodiment, the guide column includes two guide columns arranged radially symmetrically with respect to the pivot axis, and the guide groove includes two guide grooves arranged radially symmetrically with respect to the pivot axis.

[0034] In one embodiment, the limiting stop portion includes a connecting portion that extends radially integrally between the inner cylinder and the outer cylinder. [Effects of the Invention]

[0035] By using the technical means of the present invention, the angle of the protective helmet relative to the headgear when it is in the reclined position can be easily adjusted. This allows the user to adjust the protective helmet according to various viewing postures they adopt, and also ensures that the user's field of vision always passes appropriately through the viewing window of the protective helmet, allowing the user to see the outside. [Brief explanation of the drawing]

[0036] The various aspects and principles of this application can be fully understood from the following detailed description, along with the attached drawings. Note that the drawings may be shown in different proportions for illustrative purposes only; however, this does not affect the understanding of this application.

[0037] Figure 1 is a schematic perspective view of a protective helmet according to one embodiment of the present invention, which is embodied, for example, as a welding helmet, in which most of the headgear assembly configured to work with the welding helmet is hidden by the welding helmet, with only the rotary knob of the adapter of the headgear assembly exposed.

[0038] Figure 2 is a schematic perspective view showing a headgear assembly according to one embodiment of the present invention, configured to work in conjunction with a protective helmet.

[0039] Figure 3 is a schematic perspective view showing a pair of adapters of a headgear assembly according to one embodiment of the present invention, showing only the portion of the gearhead of the headgear assembly that is connected to these adapters.

[0040] Figure 4 is a schematic perspective view of a portion of the protective helmet, which is connected to one adapter of the headgear assembly, and the adapter is configured to adjust the angle of the protective helmet relative to the headgear when the protective helmet is in the flipped-down position.

[0041] Figure 5 is a schematic exploded perspective view showing how the adapter from Figure 4 is assembled and connected to a protective helmet.

[0042] Figure 6 is a schematic perspective view showing the position limiting member of the adapter in Figure 5, and the position limiting member is shown from a different viewing direction than in Figure 5.

[0043] Figure 7 is a schematic perspective view showing the adjustment member of the adapter in Figure 5, and the adjustment member is shown from a different viewing direction than in Figure 5.

[0044] Figure 8 is a schematic side view showing the cantilever of the adapter in Figure 5.

[0045] Figure 9 is a schematic perspective view showing the fixing member of the adapter in Figure 5, and the fixing member is shown from a different viewing direction than in Figure 5.

[0046] Figure 10 is a schematic partial cross-sectional perspective view showing a cantilever.

[0047] Figure 11A is a schematic cross-sectional view showing a portion of the adapter in Figure 4 when the position limiting member is in the released position.

[0048] Figure 11B is a schematic cross-sectional view showing a portion of the adapter in Figure 4 when the position limiting member is in the pressed position.

[0049] Figure 12A is a schematic partial cross-sectional view of the adapter shown in Figure 4, with the protective helmet housing in the flipped-down position and before the locking state of the position limiting member is changed.

[0050] Figure 12B is a schematic partial cross-sectional view showing the adapter of Figure 4 in the state after the protective helmet housing is in the flipped-down position and the lock state of the position limiting member has been changed. [Modes for carrying out the invention]

[0051] In the drawings, features having the same configuration or similar function are indicated by the same reference numeral.

[0052] Figure 1 schematically shows a protective helmet 100. As a non-limiting example, a welding helmet is embodied as the protective helmet 100. The protective helmet 100 generally comprises a helmet housing 110 and a viewing window 120 provided in the helmet housing 110. Hereinafter, for simplicity, the helmet housing 110 may be referred to as the housing 110. When the protective helmet 100 is in the working position (hereinafter referred to as the flipped-down position), the user can only see outside through the viewing window. For example, if the welding helmet is embodied as an auto-darkening welding helmet, the viewing window may be composed of an auto-darkening filter that automatically switches from a transparent state to a dark state at the moment a welding arc is generated. In another embodiment, the viewing window 120 of the welding helmet may be composed of a dark glass plate. Although protective helmet 100 is shown as a welding helmet, those skilled in the art will understand that protective helmet 100 as described herein may be any other suitable protective helmet that a user may wear to protect their face in a special place (such as a medical protective area).

[0053] The protective helmet 100 is configured to be detachably connected to the headgear assembly 200 shown in Figure 2. In Figure 1, the headgear assembly 200 is covered by the protective helmet 100, but one of the rotary knobs on the headgear assembly 200 is visible. This rotary knob is configured to allow the housing 110 of the protective helmet 100 to be secured to a portion of the headgear assembly 200.

[0054] As shown in Figure 2, the headgear assembly 200 generally comprises a headgear 210 and a pair of adapters 220, 230 attached to the left and right sides of the headgear 210, respectively. For example, the headgear 210 may have several bands, some of which may be length-adjustable. The headgear 210 is configured to be removablely secured to the user's head. In the context of this application, the lateral direction in the headgear refers to a direction substantially parallel to the left-right (or coronal) direction of the user's head when the headgear is removablely secured to the user's head in an appropriate manner. Two linear guide rails 211 (only one is visible in Figure 2) are formed on the bands on both sides of the headgear 210, so that when the headgear 210 is properly secured in place on the user's head, the two linear guide rails 211 can extend substantially along the front-back (or sagittal) direction of the user's head.

[0055] On each side of the headgear 210, adapters 220 and 230 are mounted on the corresponding guide rails 211 so as to be able to slide linearly along the respective guide rails 211. Furthermore, adapters 220 and 230 are configured to be selectively lockable relative to the respective guide rails 211. Whether locked or not, adapters 220 and 230 are immobile relative to the respective guide rails 211 or the headgear 210.

[0056] As shown in Figure 3, each of the adapters 220 and 230 is provided with a cantilever 340. The cantilever 340 is formed with a sliding fitting portion 341 at one end. As shown in Figure 5, the sliding fitting portion 341 has two grooves 341a configured to face each other. These two grooves 341a of each sliding fitting portion 341 are configured to accommodate two opposing side flanges 221a of the corresponding straight guide rail 211, thereby allowing the cantilever 340 to slide back and forth along the guide rail 211. A push key 342 is attached to each sliding fitting portion 341. The push key is pre-biased by a load element (not shown). In one embodiment of the present invention, the load element may be embodied as a thrust-applying spring or as a pair of thrust-applying magnets. The push key 342 is configured to rotate within the sliding fitting portion 341 about a pivot axis such that the movement trajectory of the push key or part thereof is substantially perpendicular to the respective guide rail 211. As shown in Figure 4, the push key 243 is formed with a lock tab 342a. When the push key is pre-biased by a spring, and the push key 342 is not pressed by an external force, the lock tab 342a can pass through one through hole 341b formed in the sliding fitting portion 341. Each straight guide rail 211 has multiple through holes, which are distributed in a straight line along the longitudinal direction and spaced apart from each other. The through holes in the straight guide rail 211 define the sliding lock stop position when the adapter 220 or 230 slides against the corresponding straight guide rail 211.

[0057] When it is necessary to slide the cantilever 340 along the corresponding straight guide rails 211, pressing the corresponding push key 342 allows the lock tab 342a to be pulled out from the corresponding through hole 341b of the sliding fitting portion 341, thereby allowing the cantilever 340 to slide freely along the corresponding straight guide rails 211. When one of the through holes in the straight guide rail 211 aligns with the through hole 341b of the sliding fitting portion 341 that cooperates with the straight guide rail, releasing the pressure on the push key 342 allows the lock tab 342 to pass through both aligned through holes, thereby preventing the cantilever 340 from sliding further along the straight guide rail 211. The cantilever 340 is configured to be immovable relative to the straight guide rail 211 or the headgear 210.

[0058] Each adapter 220, 230 is also provided with a rotary knob 310. The rotary knob 310 is configured to prevent the helmet housing 110 of the protective helmet 100, which is non-rotatably mounted to the cantilever 340, from being unintentionally separated from the adapters 220, 230. After the protective helmet 100 is mounted to the headgear 210 via the adapters 220, 230, these two adapters 220, 230 define a common axis of rotation, and the protective helmet 100 becomes rotatable relative to the headgear 210 about this axis of rotation. For example, when the headgear 210 connected to the protective helmet 100 is fixed in place on the user's head, the axis of rotation is located approximately adjacent to the user's ear.

[0059] Therefore, after the user puts on the headgear 210 and secures it in place on their head, the protective helmet 100 can be selectively switched between a flipped-down position where the protective helmet covers the user's face and a flipped-up position where the user's face is exposed. For example, in the flipped-up position, the protective helmet 100 may be positioned near the top of the user's head. One of the two adapters 220, 230 is configured to lock the protective helmet 100 in the flipped-down position, and the other is configured to lock the protective helmet 100 in the flipped-up position. This is because if the protective helmet 100 cannot be locked in the flipped-down position, the relatively heavy protective helmet 100 may come into direct contact with the user's face due to gravity, potentially causing discomfort to the user. Also, if the protective helmet is not locked in the flipped-up position, it may unintentionally rotate and fall from the flipped-up position, potentially injuring the user's face by hitting the already exposed face.

[0060] In the following description of this application, the adapter 230 on the right is used as an example of an adapter for illustrating a method of locking the protective helmet 100 in the flipped-down position, and the adapter 220 on the left is used as an example of an adapter for locking the protective helmet 100 in the flipped-up position. Those skilled in the art will understand that these two adapters 220 and 230 are interchangeable with each other if the technical solution of this application is feasible.

[0061] As shown in Figures 4 and 5, in addition to the cantilever 340 and rotary knob 310, the adapter 230 also includes a washer member 320, a fixing member 330, an adjustment member 350, and a position limiting member 380. Furthermore, as shown in Figures 5 and 8, a seat 345 is formed at the other end of the cantilever 340 opposite to the sliding fitting portion 341. For example, the seat 345 is substantially hollow cylindrical in shape. In particular, the inner wall of the hollow cylindrical seat 345 is cylindrical. A circular hole 343 is formed in the center of the end of the seat 345 adjacent to the housing 110 of the protective helmet 100 when assembled. An opening is formed at the end of the seat 345 opposite to the end with the central circular hole 343, having a diameter substantially equal to the diameter of the cylinder.

[0062] Teeth 344 (e.g., one or more tooth groups 344) may be formed on the cylindrical inner wall of the receiving seat 345, protruding from the cylindrical inner wall. In the illustrated embodiment, two tooth groups 344 that are radially symmetrical to each other are shown. In Figure 3, only one of the two tooth groups 344 is visible, while in Figure 8, both tooth groups 344 are visible. Each tooth group 344 consists of multiple teeth 344 arranged adjacent to each other with space between them along the circumferential direction.

[0063] Two openings 111 are formed in the left and right housing walls of the housing 110 of the protective helmet 100, respectively. In Figure 5, only the right-hand opening of the two openings is shown. The openings 111 are non-circular. For example, in Figure 5, the openings 111 are shown as substantially square. One fixing member 330, such as the fixing member 330 described above, can be partially inserted into the openings 111 of the housing 110. For example, the fixing member 330 is substantially annular. Multiple ribs (e.g., a first rib 331, two second ribs 332, and a third rib 333) are formed on one face of the fixing member 330, and these ribs project axially from that face of the fixing member 330. These ribs are formed to surround a central circular hole 334 formed in the fixing member 330. Ribs 331, 332, and 333 together define the portion of the fixing member 330 that is inserted into the opening 111, and their outer contours or shapes are formed to be substantially complementary to the shape of the opening 111. In this way, when these ribs are positioned within the opening 111, the fixing member 330 becomes immobile relative to the housing 110. Notches 112 are formed on the edge of the opening 111 to ensure that the fixing member 330 cannot rotate relative to the housing 110 when assembled and therefore has a single orientation after assembly (for example, it is shown that two notches 112 are formed on the corresponding edges of the opening). Additionally, a radially extending projection 335 is formed on one of the ribs of the fixing member 330 (for example, the third rib 333). In this case, when the ribs 331, 332, and 333 of the fixing member 330 are positioned within the opening 111, the projection 335 engages with one of the notches 112, thereby further preventing the fixing member 330 from rotating relative to the housing 110. In a preferred embodiment of the present invention, radially extending ridges are formed on the outside of each of the two second ribs 332 so that the fixing member 330 can be temporarily fixed to the housing 110 when assembled, and these ridges can snap into the corresponding edges of the opening 111.

[0064] On the side of the fixing member 330 opposite to the side on which the ribs 331, 332, and 333 are formed, the fixing member 330 is formed to have a circular outer edge portion, for example, a circular stepped portion 336. This circular stepped portion 336 is configured to fit onto the inner edge of the central circular hole 343 of the cantilever 340, such that the central circular hole 343 of the cantilever 340 is coaxially positioned with the central circular hole 334 of the fixing member 330. Therefore, in the assembled state, the cantilever 340 contacts the fixing member 330 only at the circular stepped portion 336, and the cantilever 340 can be rotated relative to the fixing member 330 as needed. Thus, the fixing member 330 can be considered to constitute a bearing that allows the adjustment member 350 and the helmet housing 110 to rotate relative to the cantilever 340 about a pivot axis. In another embodiment, a circular step portion having a shape complementary to the above-mentioned circular step portion may be formed on the inner periphery of the central circular hole 343 of the cantilever 340, and the (stepless) circular outer periphery of the fixing member 330 may be fitted into it, thereby making it possible to position the central circular hole 343 of the cantilever 340 coaxially with the central hole 334 of the fixing member 330.

[0065] The adjustment member 350 is mounted within the receiving seat 340. As shown in Figures 5 and 7, the adjustment member 350 comprises a disc-shaped body 351. A hollow cylinder 352 extends axially from one surface of the disc-shaped body 351. An internal thread 352a is formed on the inner wall of the hollow cylinder 352. An axially extending groove 352b is formed on the outer wall of the hollow cylinder 352. In the embodiments described herein, the groove 352b consists of two axially extending grooves 352b provided radially symmetrically on the outer wall of the hollow cylinder. When the disc-shaped body 351 is properly mounted within the receiving seat 340, the hollow cylinder 352 can protrude outward from the receiving seat 345 through the central circular hole 343 and be inserted into the central hole 334 of the fixing member 330. A convex portion 334a is formed on the inner wall of the central hole 334 of the fixing member 330, projecting radially from the inner wall. In the illustrated embodiment, for example, the protrusion 334a is composed of two protrusions 334a arranged radially symmetrically to each other. The maximum outer diameter of the hollow cylinder 352 is equal to or slightly smaller than the inner diameter of the central hole 334 of the fixing member 330, but each protrusion 334a of the fixing member 330 is fittable into the groove 352b, thereby allowing the adjustment member 350 to be positioned coaxially with the fixing member 330, but they cannot rotate relative to each other. In another embodiment, the fixing member 330 or the structure represented by the fixing member 330 may be integrally formed with the helmet housing 110.

[0066] A sleeve 353 is formed on the disc-shaped body 351 on the surface opposite in the axial direction to the surface on which the hollow cylinder is formed, so as to be coaxial with the hollow cylinder 352, and an annular row of teeth 355 is formed to surround the sleeve 353. In addition, guide posts 354 extending in the axial direction are formed on the same surface of the disc-shaped body 351. For example, the guide posts 354 consist of two axially extending guide posts 354 arranged radially symmetrically with respect to each other. Each guide post 354 is separated from the sleeve 353 by the annular row of teeth 355. A through hole 356 is formed in the center of the disc-shaped body 351. The center of the through hole 356 is located on the coincident central axis of the sleeve 353 and the hollow cylinder 352. The adjustment member 350 and the cantilever 340 are configured such that when the adjustment member 350 is properly mounted within the seat 345, the guide column 354 does not come into contact with the teeth 344, and relative rotational movement between the adjustment member 350 and the seat 345 is not hindered.

[0067] In addition to the adjustment member 350, a position limiting member 380 is also mounted within the seat 345 of the cantilever 340. For example, the position limiting member 380 has a substantially circular lid shape. An outer cylinder (or ring) 381 is formed on one side of the position limiting member 380, and this outer cylinder 318 can be inserted into the seat 345. Also formed on the same side of the position limiting member 380 is an inner cylinder (or ring) 382 coaxial with the outer cylinder 381. A guide groove 383 is defined between the outer cylinder 381 and the inner cylinder 382. For example, the guide groove 383 consists of two circumferential guide grooves 383. The two circumferential guide grooves 383 are separated from each other by two limiting stop sections 384. For example, the limiting stop sections 384 are connecting walls or connections integrally formed between the inner cylinder 382 and the outer cylinder 381 and / or extending radially. In the position limiting member 380, a fixing cylinder 385 is formed inside the inner cylinder 382. The fixing cylinder 385 is arranged coaxially with the inner cylinder 382.

[0068] The other surface of the position limiting member 380 is disc-shaped. The diameter of this disc is slightly smaller than the diameter of the circular opening of the receiving seat 345, allowing the position limiting member 380 to be housed within the receiving seat 345. The outer cylinder 381 of the position limiting member 380 has a plurality of external teeth 381a formed on it. These external teeth 381a are distributed in the circumferential direction and are positioned axially at a predetermined axial distance from the disc-shaped surface. The axial distance from the disc-shaped surface to the external teeth 381a is substantially equal to the axial distance from the circular opening of the receiving seat 345 for housing the position limiting member 380 to the teeth 344 of the receiving seat 345. On the other hand, the teeth 344 of the receiving seat 345 are axially dimensioned such that their axial length is shorter than the axial distance from the disc-shaped surface to the external teeth 381a.

[0069] The sleeve 353 is configured to be inserted into the inner cylinder 382. An annular tooth row 382a is formed on the free end side of the inner cylinder 382. The annular tooth row 382a is circumferentially dimensioned so that it can match the annular tooth row 355. During assembly, the spiral spring 370 is positioned inside the sleeve 353. At the same time, the shaft of the bolt 390 passes through the central through hole 356 of the disc-shaped body 351 and is partially screwed into the fixing cylinder 385. The head of the bolt 390 is larger than the diameter of the through hole 356, and when the bolt 390 is screwed in firmly to a predetermined extent, the spiral spring 370 is compressed between the position limiting member 380 and the adjustment member 350, generating an axial spring force between them. This spring force acts to separate the two members from each other. A subassembly can be formed by connecting the position limiting member 380, the adjustment member 350, and the spiral spring 370 using bolts 390. The formed subassembly is mounted inside the seat 345 of the cantilever 340. In this way, the disc-shaped body 351 of the adjustment member 350 can at least partially contact the end face of the seat 345 in which the central circular hole 343 is formed, while the hollow cylinder 352 of the adjustment member 350 penetrates the central circular hole 343 and protrudes from the end face.

[0070] Furthermore, as shown in Figures 5 and 10, after the hollow cylinder 352 of the adjustment member 350 protrudes outward from the receiving seat 345, this hollow cylinder can be inserted into the fixing member 330 which is already fixed to the housing 110. Subsequently, the hollow cylinder 352 can protrude outward from the housing 110 on the opposite side, where a washer member 320 is fitted around the outer circumference of the hollow cylinder 352. For example, the washer member 320 is formed to have a central hole 321 similar to the central hole 334 of the fixing member 330, so that when the hollow cylinder 352 passes through the central hole 321, the adjustment member 350 becomes immobile relative to the washer member 320. A threaded stud 311 is formed on one end face of the rotary knob 310, and the external thread of this threaded stud 311 can engage with the internal thread 352a of the hollow cylinder 352. By firmly screwing in the rotary knob 310, the housing 110 of the protective helmet 100 and the seat 345 of the cantilever 340 are axially clamped between the disc-shaped body 351 of the adjustment member 350 and the washer member 320 or the rotary knob 310.

[0071] As shown in Figures 10 and 11A, when assembled in a predetermined position and the position limiting member 380 is not pressed, the disc-shaped surface of the position limiting member 380 is flush with the edge of the opening of the seat 345, and the annular teeth 382a of the inner cylinder 382 do not engage with the annular teeth 355 of the adjustment member 350 due to the spring force. That is, in this case, when the annular teeth 382a and the annular teeth 355 are not engaged, relative rotational movement between the adjustment member 350 and the position limiting member 380 is not hindered. The axial distance from the edge of the opening of the seat 345 to the tooth 344 is set so that the tooth 344 engages with the corresponding outer tooth 381a, and as a result the position limiting member 380 is unable to rotate relative to the seat 345 or the cantilever 340. On the other hand, the guide column 354 can partially extend in the axial direction into the corresponding guide groove 383. Therefore, when the housing 110 is rotated relative to the cantilever 340 by an external force, for example, when the housing 110 is rotated from the flipped-up position to the flipped-down position (along the dotted arrow "A" in Figures 12A and 12B), the guide posts 354 are guided and moved circumferentially within their respective guide grooves 383. The guide posts 354 and their respective guide grooves 383 are dimensioned so as not to hinder the axial movement of the position limiting member 380 relative to the adjustment member 350. When the guide posts 354 are stopped by their respective limiting stop parts 384 (as shown in Figures 12A and 12B), the housing 110 (represented by the dotted line in Figures 12A and 12B) can be stopped in the flipped-down position by gravity. Therefore, the limiting stop parts 384 can be used to define the angle of the protective helmet 100 in the flipped-down position relative to the cantilever 340 or headgear 210. Therefore, the limiting stop section 384 and the guide post 354 are considered together as a guide limiting structure defined between the position limiting member 380 and the adjuster 350, and this guide limiting structure prevents the helmet housing 110 in the flipped-down position from further rotating around the pivot axis in a direction away from the flipped-up position relative to the headgear 210.

[0072] As shown in Figure 11B, if it is necessary to change the circumferential position or angle of the limiting stop 384 relative to the cantilever 340, the user can manually press the position limiting member 380 to move it axially toward the housing 110 within the seat 345 until the teeth 344 of the seat 345 are positioned axially between the external teeth 381a and the disc-shaped surface of the position limiting member 380, and the annular teeth 382a of the position limiting member 380 contact and engage with the annular teeth 355 of the adjustment member 350. In this case, if the user rotates the housing 110 of the protective helmet 100 while pressing the position limiting member 380, the adjustment member 350 is driven by the housing 110, thereby further rotating the position limiting member 380 relative to the seat 345. This is because the annular teeth 355 engage with the annular teeth 382, ​​and the external teeth 381a are disengaged from the teeth 344 of the seat 345. In this way, the circumferential position or angle of the limiting stopper 384 relative to the cantilever 340 or the receiving seat 345 can be changed.

[0073] After rotating the position limiting member 380 around the pivot axis by an appropriate angle relative to the receiving seat 345, the pressure on the position limiting member 380 is released, returning the position limiting member 380 to a state where it is not manually pressed, and returning to the state shown in Figures 10 and 11A. In this state, the disc-shaped surface of the position limiting member 380 is flush with the edge of the opening of the receiving seat 345, the teeth 344 engage with the corresponding external teeth 381a of the position limiting member 380, and the annular tooth row 382a of the position limiting member 380 does not come into contact with the annular tooth row 355 of the adjustment member 350. As a result, the position limiting member 380 is unable to rotate around the pivot axis relative to the receiving seat 345 or the cantilever 340.

[0074] That is, in Figure 11A, the adapter's position limiting member 380 is in a locked state, non-rotatable (or rotationally locked) relative to the cantilever 340 or its seat 345, and in Figure 11B, the adapter's position limiting member 380 is in an unlocked state, rotatable relative to the cantilever 340 or its seat 345. The spiral spring 370 is always compressed, regardless of whether the position limiting member 380 is locked or unlocked. Furthermore, the spring force of the spiral spring 370 generates a restoring force that causes the position limiting member 380 to automatically return from the unlocked state to the locked state as needed. In one embodiment of the present application, the spiral spring 370 is described as a non-limiting example of an elastic element that generates a restoring force that causes the position limiting member 380 to automatically return from the unlocked state to the locked state as needed. Naturally, those skilled in the art will understand that other suitable elements with a similar function, such as a spring seat or elastic bellows, can be used as substitutes for the example of the elastic element.

[0075] In another embodiment, the teeth 355 and 382a may be omitted, or a structure similar to the teeth 355 and 382a may be provided on the opposing surfaces of the inner cylinder 328 and the guide column 354. In this configuration, when the position limiting member 380 is in the unlocked state, the engagement of a structure similar to the teeth 355 and 382a allows the position limiting member 380 to rotate relative to the receiving seat 345 by the adjustment 350, while when the position limiting member 380 is in the locked state, the position limiting member 380 becomes immobile relative to both the receiving seat 34 and the adjustment member 380.

[0076] In another embodiment, the teeth 344 may be provided around the entire circumference of the inner wall of the seat 345, and the teeth 381a may be provided at one or more positions in the circumferential direction of the outer cylinder 381. In another embodiment, the washer member 320 may be omitted, and the threaded stud 311 of the rotary knob 310 may be directly engaged with the internal thread 352a of the hollow cylinder 352. This causes the housing 110 to be axially clamped between the rotary knob 310 and the cantilever 340.

[0077] Figures 12A and 12B show the adapter 230 when the position limiting member 380 is locked and the housing 110 (partially shown by a dotted line in Figures 12A and 12B) is in the flipped-down position. These two figures differ from each other in that the circumferential position or angle of the limiting stop 384 relative to the seat 345 or cantilever 340 is different in the two figures. Therefore, when the housing 110 is in the flipped-down position, the viewing window of the housing 110 can be rotated around the pivot axis to change the angle of the viewing window relative to the headgear worn by the user. In this way, the viewing window can be adjusted to the user's field of view.

[0078] In another embodiment (not shown), the limiting stop portion constituting part of the guide limiting structure may be formed on the adjustment member 350, and the guide column constituting other parts of the guide limiting structure may be formed on the position limiting member 380. In this case, the inner cylinder and outer cylinder can be formed on the adjustment member so as not to affect the rotation of the adjustment member about the pivot axis within the receiving seat 345, and the (one or more) guide column can be formed on the end side of the position limiting member facing the adjustment member, and can be guided within one or more guide grooves defined between the inner cylinder and the outer cylinder, and can stop by abutting against the end of the guide groove.

[0079] Although several specific embodiments of the present application have been described in detail herein, these are for illustrative purposes only and do not limit the scope of the application. Furthermore, those skilled in the art will understand that various embodiments of the present application can be combined arbitrarily. Various changes, modifications, and substitutions are conceivable without departing from the spirit and scope of the application.

Claims

1. Headgear (210), Helmet housing (110) and A protective helmet (100) comprising an adapter connected between the headgear (210) and the helmet housing (110), wherein the helmet housing (110) is selectively rotatable about a pivot axis relative to the headgear (210), thereby allowing switching between a flipped-down position and a flipped-up position, the adapter including an adapter (230) configured to define the flipped-down position of the helmet housing (110), The adapter (230), which is configured to define the downward position of the helmet housing (110), A cantilever (340) is non-rotatably attached to the headgear (210), An adjustment member (350) that is detachably connected to the helmet housing (110) and is not rotatable relative to the helmet housing, wherein at least a portion of the adjustment member (350) is attached within the receiving seat (345) of the cantilever (340), The cantilever (340) is equipped with a position limiting member (380) attached to the receiving seat (345), Between the position limiting member (380) and the adjustment member (350), a guide limiting structure is provided to prevent the helmet housing (110) from further rotating away from the headgear (210) in the flipped-down position. A protective helmet (100) characterized in that the position limiting member (380) is configured to be selectively switchable between a locked state in which the position limiting member (380) is unable to rotate around the pivot axis relative to the receiving seat (345) and an unlocked state in which the position limiting member (380) is able to rotate around the pivot axis relative to the receiving seat (345).

2. The protective helmet (100) according to claim 1, wherein the position limiting member (380) is configured to be switched between the locked state and the unlocked state by axial movement of the position limiting member within the receiving seat (345).

3. The protective helmet (100) according to claim 2, wherein the adjusting member (350) comprises a disc-shaped body (351) and a guide column (354) extending substantially parallel to the pivot axis from the disc-shaped body (351), the position limiting member (380) comprises a circumferential guide groove (383) configured to accommodate and guide the guide column (354), and the guide limiting structure comprises the guide column (354) and a limiting stop portion (384) located at the end of the circumferential guide groove (383).

4. The protective helmet (100) according to claim 3, wherein the adjusting member (350) further comprises a hollow cylinder (352) extending coaxially with the pivot axis from the disc-shaped body (351) on the side opposite to the guide column (354), the hollow cylinder (352) non-rotatably penetrates the housing wall of the helmet housing (110) and is detachably connected to a rotating knob (310), and the receiving seat (345) and the housing wall of the helmet housing (110) are held axially between the disc-shaped body (351) and the rotating knob (310).

5. The protective helmet (100) according to claim 4, wherein the adjusting member (350) further comprises a sleeve (353) extending from the disc-shaped body (351) to the same side as the guide column (354), the sleeve (353) being coaxial with the hollow cylinder (352) and radially separated from the guide column (354), the position limiting member (380) comprises an inner cylinder (382) and an outer cylinder (381) that are coaxial with each other, the circumferential guide groove (383) is defined between the inner cylinder (382) and the outer cylinder (381), and the sleeve (353) is inserted into the inner cylinder (382) within the receiving seat (345).

6. The protective helmet (100) according to claim 5, wherein one or more teeth (344) are formed circumferentially distributed on the cylindrical inner wall of the receiving seat (345), and an annular external tooth row (381a) is formed on the outer cylinder (381) of the position limiting member (380), and only when the position limiting member (380) is in the locked state, the one or more teeth (344) can engage with the corresponding teeth of the annular external tooth row (381a), thereby preventing the position limiting member (380) from rotating relative to the receiving seat (345).

7. The protective helmet (100) according to claim 5, wherein an annular tooth array (344) is formed on the cylindrical inner wall of the receiving seat (345), and one or more external teeth (381a) are formed circumferentially distributed on the outer cylinder (381) of the position limiting member (380), and the one or more external teeth (381a) can engage with the corresponding teeth of the annular tooth array (344) only when the position limiting member (380) is in the locked state, thereby preventing the position limiting member (380) from rotating relative to the receiving seat (345).

8. The protective helmet (100) according to claim 6, wherein an annular tooth row (355) is formed on the disc-shaped body (351) around the sleeve (353), and an annular tooth row (382a) is formed on the free end of the inner cylinder (382), and only in the unlocked state the annular tooth row (382a) of the position limiting member (380) can engage with the corresponding teeth of the annular tooth row (355) of the adjusting member (350), thereby enabling the position limiting member (380) to rotate within the receiving seat (345) by being driven by the adjusting member (350) about the pivot axis.

9. The protective helmet (100) according to claim 8, wherein an elastic element is disposed within the sleeve (353) to provide a restoring force that causes the position limiting member (380) to return from the unlocked state to the locked state.

10. The protective helmet (100) according to claim 9, wherein a bolt (390) passes through the disc-shaped body (351) and is screwed into a fixing cylinder (385) of the position limiting member (380), thereby defining the axial distance of the position limiting member (380) relative to the disc-shaped body (351) when the position limiting member (380) is in the locked state.

11. The protective helmet (100) according to claim 10, wherein the fixing member (330) is provided on the housing wall of the helmet housing (110) so as not to rotate about the pivot axis, and the hollow cylinder (352) is configured to pass through the central hole (334) of the fixing member (330) so as not to rotate about the pivot axis.

12. The protective helmet (100) according to claim 11, wherein a washer member (320) is fitted around the outer circumference of the hollow cylinder (352) and is clamped axially between the housing wall of the helmet housing (110) and the rotating knob (310).

13. The protective helmet (100) according to claim 12, wherein an internal thread (352a) is formed on the inner wall of the hollow cylinder (352) that engages with the threaded stud (311) of the rotary knob (310).

14. The protective helmet (100) according to claim 13, wherein the guide posts (354) include two guide posts (354) arranged radially symmetrically with respect to the pivot axis, and the guide grooves (383) include two guide grooves (383) arranged radially symmetrically with respect to the pivot axis.

15. The protective helmet (100) according to claim 14, wherein the limiting stop portion (384) includes a connecting portion that extends radially integrally between the inner cylinder (382) and the outer cylinder (381).

16. A protective helmet (100) according to claim 15, which is a welding helmet.

17. An adapter (230) for connecting a protective helmet (100) to a headgear (210), wherein the helmet (110) is selectively rotatable about a pivot axis relative to the headgear (210), thereby allowing switching between a flipped-down position and a flipped-up position. The adapter (230) is configured to define the downward position of the helmet housing (110), The adapter (230) comprises a cantilever (340) that is not rotatably attached to the headgear (210), and an adjustment member (350) that is at least partially attached to the receiving seat (345) of the cantilever (340) and thereby not rotatably connected to the helmet housing (110). The adapter (230) further comprises a position limiting member (380) mounted within the receiving seat (345) of the cantilever (340), Between the position limiting member (380) and the adjustment member (350), a guide limiting structure is provided to prevent the adjustment member (350) from further rotating away from the upward direction when the helmet housing (110) is in the downward position. The adapter (230) is characterized in that the position limiting member (380) is configured to be selectively switchable between a locked state in which the position limiting member (380) is unable to rotate relative to the receiving seat (345) about the pivot axis, and an unlocked state in which the position limiting member (380) is able to rotate relative to the receiving seat (345) about the pivot axis.

18. The adapter (230) according to claim 17, wherein the position limiting member (380) is configured to be switched between the locked state and the unlocked state by axial movement of the position limiting member within the receiving seat (345).

19. The adapter (230) according to claim 18, wherein the adjusting member (350) comprises a disc-shaped body (351) and a guide column (354) extending substantially parallel to the pivot axis from the disc-shaped body (351), the position limiting member (380) comprises a circumferential guide groove (383) configured to accommodate and guide the guide column (354), and the guide limiting structure comprises the guide column (354) and a limiting stop portion (384) located at the endpoint of the circumferential guide groove (383).

20. The adapter (230) according to claim 18, wherein the adjusting member (350) further comprises a hollow cylinder (352) extending coaxially with the pivot axis from the disc-shaped body (351) on the side opposite to the guide column (354), and the hollow cylinder (352) is provided with an end that penetrates the housing wall of the helmet housing (110) and is configured to be detachably connected to the rotary knob (310).

21. The adapter (230) according to claim 20, wherein the adjusting member (350) further comprises a sleeve (353) extending from the disc-shaped body (351) to the same side as the guide column (354), the sleeve (353) being coaxial with the hollow cylinder (352) and radially separated from the guide column (354), the position limiting member (380) comprises an inner cylinder (382) and an outer cylinder (381) that are coaxial with each other, the circumferential guide groove (383) is defined between the inner cylinder (382) and the outer cylinder (381), and the sleeve (353) is inserted into the inner cylinder (382) within the receiving seat (345).

22. The adapter (230) according to claim 21, wherein one or more teeth (344) are formed circumferentially distributed on the cylindrical inner wall of the receiving seat (345), and an annular external tooth row (381a) is formed on the outer cylinder (381) of the position limiting member (380), and only when the position limiting member (380) is in the locked state, the one or more teeth (344) can engage with the corresponding teeth of the annular external tooth row (381a), thereby preventing the position limiting member (380) from rotating relative to the receiving seat (345).

23. The adapter (230) according to claim 21, wherein an annular tooth array (344) is formed on the cylindrical inner wall of the receiving seat (345), and one or more external teeth (381a) are formed circumferentially distributed on the outer cylinder (381) of the position limiting member (380), and the one or more external teeth (381a) can engage with corresponding teeth of the annular tooth array (344) only when the position limiting member (380) is in the locked state, thereby preventing the position limiting member (380) from rotating relative to the receiving seat (345).

24. The adapter (230) according to claim 22, wherein an annular tooth array (355) is formed on the disc-shaped body (351) around the sleeve (353), and an annular tooth array (382a) is formed on the free end of the inner cylinder (382), and only in the unlocked state, the annular tooth array (382a) of the position limiting member (380) can engage with the corresponding teeth of the annular tooth array (355) of the adjusting member (350), thereby enabling the position limiting member (380) to rotate within the receiving seat (345) by being driven by the adjusting member (350) about the pivot axis.

25. The adapter (230) according to claim 24, wherein an elastic element is disposed within the sleeve (353) to provide a restoring force that causes the position limiting member (380) to return from the unlocked state to the locked state.

26. The adapter (230) according to claim 25, wherein a bolt (390) passes through the disc-shaped body (351) and is screwed into a fixing cylinder (385) of the position limiting member (380), thereby defining the axial distance of the position limiting member (380) relative to the disc-shaped body (351) when the position limiting member (380) is in the locked state.

27. The adapter (230) according to claim 26, wherein an internal thread (352a) is formed on the inner wall of the hollow cylinder (352) that engages with the threaded stud (311) of the rotary knob (310).

28. The adapter (230) according to claim 27, wherein the guide column (354) includes two guide columns (354) arranged radially symmetrically with respect to the pivot axis, and the guide groove (383) includes two guide grooves (383) arranged radially symmetrically with respect to the pivot axis.

29. The adapter (230) according to claim 28, wherein the limiting stop portion (384) includes a connecting portion that extends radially integrally between the inner cylinder (382) and the outer cylinder (381).

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