A flip-top face mask

Abstract

This invention belongs to the field of welding mask technology and discloses a flip-top mask, comprising: a mask body and a flip cover; the flip cover is connected to the mask body via a pivoting connection mechanism, allowing the flip cover to pivot around the mask body between a closed position and an open position. The pivoting connection mechanism is configured such that: when the flip cover is in the closed position, at least one contour point on the flip cover has a radial distance from the pivot axis to the pivot axis that is less than the maximum radial distance from the mask body contour line to the pivot axis within the same circumferential plane and the pivot angle from the closed position to the open position; during the pivoting process from the closed position to the open position, the radial distance from any contour point on the flip cover to the pivot axis is greater than the radial distance from the mask body contour point to the pivot axis within the same circumferential angle. This invention, through the variable-diameter pivoting of the flip cover, achieves overall mask center of gravity stability and wearing comfort, improves the wearer's field of vision, and reduces the weight of the mask body, achieving lightweight design.

Description

Technical Field

[0001] This invention belongs to the field of welding mask technology. More specifically, it relates to a flip-top mask. Background Technology

[0002] A flip-top welding mask typically consists of a main housing and a flip-top cover. The cover is connected to the main housing via one or more pivot structures. Different protective lenses, such as auto-dimming filters and ordinary protective lenses, are installed in the viewing windows of the flip-top and the main housing. When the main housing is worn on the user's head, the flip-top can be flipped up or to the side. As the user flips the cover up or down, the position of the protective lens in the flip-top's viewing window changes, allowing for quick switching between welding operations and auxiliary operation modes such as observation and grinding. For example, during welding operations, the auto-dimming filter on the flip-top provides dynamic protection for the user's eyes; during grinding operations, the user flips the cover up, and the protective lens on the main housing provides the user's eyes with a bright, unobstructed view.

[0003] In the prior art, flip-up structures are implemented in various forms. For example, US Patent 4,100,619A describes a welded face mask with a liftable front section, the front of which is connected by a simple hinge and can be flipped upwards to expose the field of vision. Another example is Chinese Patent CN201336993Y, which describes a flip-up structure where the flip is connected to the housing via a hinge and is equipped with a locking device to prevent accidental opening. Furthermore, both US Patent US2012 / 185989A1 and Chinese Patent CN108497604A describe a structure that integrates an auto-dimming lens unit within a flip-up front cover, with the flip pivot point located at the top or side of the front housing, allowing opening and closing through a simple rotational movement.

[0004] The main shortcomings of existing flip-up face masks are concentrated in the following three aspects:

[0005] First, to ensure that the flip cover does not interfere with the main housing during flipping, it needs to be moved radially outward, meaning there is a significant distance between the flip cover and the axis of rotation. This design shifts the overall center of gravity of the mask forward, increasing the burden on the user's neck muscles and potentially causing fatigue during prolonged wear. Furthermore, the lenses are further away from the user's eyes, resulting in a loss of some field of vision and affecting the viewing experience.

[0006] Secondly, when the flip cover is fully open, an unobstructed gap is formed between it and the main housing. During the post-welding grinding process, flying grinding dust and high-temperature iron slag can easily penetrate through the gap, contaminating the inner surface of the automatic dimmer lens and the breathing area.

[0007] Third, when the flap is fully open, the flap overlaps with the main housing, increasing the weight of the mask.

[0008] Therefore, it is necessary to provide a flip-up face mask that is comfortable to wear, lightweight, and provides a good field of vision. Summary of the Invention

[0009] To at least solve one or more of the technical problems mentioned above, the present invention provides a flip-type face mask, comprising: a face mask body and a flip cover; the flip cover is connected to the face mask body via a pivoting connection mechanism, such that the flip cover can pivot around the face mask body between a closed position and an open position; when the flip cover is in the closed position, the viewing window of the flip cover is fully or partially aligned with the observation window of the face mask body; when the flip cover is in the open position, the viewing window of the flip cover is fully or partially offset from the observation window of the face mask body.

[0010] According to one embodiment of the present invention, a closing part is provided on the lower side of the viewing window of the flip cover, and a first mating part is provided on the upper side of the viewing window of the mask body. When the flip cover is in the open position, the closing part engages with the first mating part to close the gap between the flip cover and the mask body.

[0011] According to one embodiment of the present invention, a second mating part is provided on the lower side of the observation window of the mask body. When the flap is in the closed position, the sealing part engages with the second mating part to close the gap between the flap and the mask body.

[0012] According to one embodiment of the present invention, the closure portion is made of a flexible material or a rigid material.

[0013] According to one embodiment of the present invention, the closing part is located at the bottom edge of the flap or at the inner surface of the flap.

[0014] According to one embodiment of the present invention, the first mating part is located at the top edge of the mask body or the first mating part is located on the outer surface of the mask body.

[0015] According to one embodiment of the present invention, the closing part includes at least a first abutting surface, and the first mating part includes at least a first receiving surface. The first abutting surface and the first receiving surface are substantially parallel to the pivoting direction of the flip cover. When the flip cover is in the open position, the first abutting surface abuts against the first receiving surface.

[0016] According to one embodiment of the present invention, the closing part includes at least a second abutting surface, and the first mating part includes at least a second receiving surface; the second abutting surface and the second receiving surface form a non-zero angle with the pivot direction of the flip cover, and when the flip cover is in the open position, the second abutting surface abuts against the second receiving surface.

[0017] According to one embodiment of the present invention, the closing part includes at least a first abutting surface and a second abutting surface, and the first mating part includes at least a first receiving surface and a second receiving surface; the first abutting surface and the first receiving surface are substantially parallel to the pivot direction of the flip cover, and when the flip cover is in the open position, the first abutting surface abuts against the first receiving surface; the second abutting surface and the second receiving surface form a non-zero angle with the pivot direction of the flip cover, and when the flip cover is in the open position, the second abutting surface abuts against the second receiving surface.

[0018] According to one embodiment of the present invention, the second abutting surface is substantially perpendicular to the first abutting surface.

[0019] According to one embodiment of the present invention, a first limiting surface is provided inside the flip cover, and a second limiting surface is provided outside the mask body; when the flip cover is in the open position, the first limiting surface abuts against the second limiting surface; the first limiting surface and the second limiting surface are substantially perpendicular to the pivot direction of the flip cover or form a non-zero angle with the pivot direction of the flip cover.

[0020] According to one embodiment of the present invention, the pivoting connection mechanism is configured such that: when the flap is in the closed position, at least one contour point on the flap has a radial distance from the pivot axis to the pivot axis that is less than the maximum radial distance from the contour line of the mask body to the pivot axis within the pivot angle from the closed position to the open position in the same circumferential plane; during the process of the flap pivoting from the closed position to the open position, the radial distance from any contour point on the flap to the pivot axis is greater than the radial distance from the contour point of the mask body to the pivot axis within the same circumferential angle.

[0021] According to one embodiment of the present invention, a pivoting connection mechanism is disposed on the side of the mask body; the pivoting connection mechanism includes a first link, a spring-loaded member, and a second link. One end of the first link is connected to the mask body via a first revolute joint, and the other end is connected to the connection point of the flip cover via a linear sliding joint extending axially along the first link; the spring-loaded member is disposed between the first revolute joint and the connection point of the flip cover, pulling the connection point of the flip cover towards the first revolute joint; one end of the second link is connected to the mask body via a second revolute joint, and the other end is connected to the connection point of the flip cover via a third revolute joint; the sum of the lengths of the linear sliding joint and the first link is greater than or equal to the sum of the distance between the first and second revolute joints and the length of the second link. Alternatively, the length of the first link is greater than or equal to the sum of the distance between the first and second revolute joints and the length of the second link; the distance between the first revolute joint and the observation window of the mask body is greater than the distance between the second revolute joint and the observation window of the mask body; the angle between the first link and the second link at the connection point of the flip cover is an acute angle.

[0022] According to one embodiment of the present invention, a first rotating joint includes a first shaft or a first cantilever beam disposed on the side of the mask body, and a first bushing disposed on the first connecting rod, the first bushing being sleeved on the first shaft or the first cantilever beam, allowing the first connecting rod to rotate around the first shaft or the first cantilever beam; and / or, a linear sliding joint includes a first slide rail disposed on the first connecting rod and a connection point disposed on the flip cover, allowing the connection point to slide linearly along the first slide rail; and / or, a rebound member includes a tension spring or a torsion spring; and / or, a second rotating joint includes a second shaft or a second cantilever beam disposed on the side of the mask body, and a second bushing disposed on the second connecting rod, the second bushing being sleeved on the second shaft or the second cantilever beam, allowing the second connecting rod to rotate around the second shaft or the second cantilever beam; and / or, a third rotating joint includes a third bushing disposed on the second connecting rod and a connection point disposed on the flip cover, the third bushing being sleeved on the connection point, allowing the connection point to rotate around the second shaft or the second cantilever beam.

[0023] According to one embodiment of the present invention, the pivoting connection mechanism includes a first link, a spring-loaded member, and a swing track; one end of the first link is connected to the mask body via a first rotating joint, and the other end is connected to the connection point of the flip cover via a linear sliding joint; the spring-loaded member is disposed between the first rotating joint and the connection point of the flip cover, and pulls the connection point of the flip cover tight along the movement direction of the linear sliding joint; the swing track is formed on or fixed to the mask body, and the distance between the swing track and the first rotating joint gradually increases and then decreases, so that the connection point of the flip cover slides along the swing track and swings around the first rotating joint with varying diameter.

[0024] According to one embodiment of the present invention, the connection point between the swing track and the flip cover is engaged by a rolling friction device.

[0025] According to one embodiment of the present invention, the first rotating joint includes a first shaft or a first cantilever beam disposed on the side of the mask body, and a first bushing disposed on the first connecting rod, the first bushing being sleeved on the first shaft or the first cantilever beam, so that the first connecting rod can rotate about the first shaft or the first cantilever beam; and / or, the linear moving joint includes a first slide rail disposed on the first connecting rod and a connection point disposed on the flip cover, so that the connection point can slide linearly along the first slide rail; and / or, the rebound element includes a tension spring or a torsion spring; and / or, the swing track is a groove or a protrusion, the shape of which is selected from any one of a circular arc segment, an elliptical arc segment, or an involute segment or a combination thereof.

[0026] According to one embodiment of the present invention, the pivoting connection mechanism is a dual-rocker mechanism, including a first rocker and a second rocker. One end of the first rocker is connected to the mask body through a first hinge, and the other end is connected to the first connection point of the flip cover through a second hinge. One end of the second rocker is connected to the mask body through a third hinge, and the other end is connected to the second connection point of the flip cover through a fourth hinge. The first hinge, second hinge, third hinge, and fourth hinge form the vertices of a closed quadrilateral. The open and closed positions of the flip cover are distributed on both sides of the point on which the flip cover is furthest from the mask body in the movement trajectory of the dual-rocker mechanism.

[0027] In this invention, when the flip cover is in the open position, the gap between the flip cover and the mask body is closed by setting a sealing part and a first mating part to engage, preventing welding slag and other debris from entering and causing contamination. By setting the sealing part at the bottom edge of the flip cover and the first mating part at the top edge of the mask body, the weight of the mask body is reduced, achieving lightweight design. By setting the viewing window of the flip cover close to the observation window of the mask body, the center of gravity of the mask is shifted backward, ensuring good visibility for the user. By setting a pivoting connection mechanism to control the flip cover's diameter-changing flipping, interference can be avoided during pivoting between the closed and open positions. By changing the diameter from small to large and then back to small, the flip cover engages with the mask body in both the open and closed positions. By setting the pivoting connection mechanism as a linkage structure, the flip cover's pivoting process is more stable, the overall center of gravity of the mask is stable, and wearing is more comfortable. By setting a swing track, the movement trajectory of the flip cover is controllable. By setting the swing track along the contour line of the mask body, the viewing window and the observation window are closer together, and the overall center of gravity of the mask is more stable. Attached Figure Description

[0028] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0029] Figure 1 A schematic diagram of a flip-top face mask with the flap in the closed position is shown.

[0030] Figure 2 A schematic diagram of a flip-top face mask with the flap in the open position is shown.

[0031] Figure 3 An exploded view of the flip-up face mask is shown;

[0032] Figure 4 A schematic diagram of the internal structure of the flip cover is shown;

[0033] Figure 5An exploded view of the side of the flip-up face mask is shown;

[0034] Figure 6 An exploded view of the side of the flip-up mask is shown from another angle;

[0035] Figure 7 An exploded view of another type of flip-up face mask is shown;

[0036] Figure 8 An exploded view of another type of flip-up face mask is shown. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be understood that the terms "comprising" and "including" as used in the specification and claims of this invention indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0039] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0040] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] Figure 1 A schematic diagram of a flip-top face mask with the flap in the closed position is shown.

[0042] Figure 2 A schematic diagram of a flip-top face mask with the flap in the open position is shown.

[0043] Figure 3 An exploded view of the flip-up face mask is shown.

[0044] like Figure 1 , Figure 2 and Figure 3As shown, the flip-top mask includes: a mask body 1 and a flip cover 2; the flip cover 2 is connected to the mask body 1 via a pivoting connection mechanism 3, so that the flip cover 2 can pivot around the mask body 1 between a closed position and an open position. When the flip cover 2 is in the closed position, the viewing window 20 of the flip cover 2 is fully or partially aligned with the observation window 10 of the mask body 1. When the flip cover 2 is in the open position, the viewing window 20 of the flip cover 2 is fully or partially offset from the observation window 10 of the mask body 1.

[0045] The mask body 1 is typically constructed as a rigid shell covering the user's face or head, and may be made of metal or composite materials. The mask body 1 is typically provided with an observation window 10, within which a functional protective goggle is installed. The mask body 1 is typically secured to the user's head by straps, mounting straps, or other similar accessories, allowing the user to observe the outside world through the observation window 10.

[0046] A flip cover 2 covers the outside of the mask body 1. The flip cover 2 is provided with a viewing window 20, and the viewing window 20 is equipped with a protective lens of the same type or different type as the observation window 10 to provide additional protection. For example, an automatic light-changing filter is provided in the viewing window 20 of the flip cover 2, and a transparent lens is provided in the observation window 10 of the mask body 1.

[0047] The pivoting connection mechanism 3 is typically located on the side of the viewing window 10 of the mask body 1. For example, when the user wears the mask body 1, the pivoting connection mechanism 3 is located on both sides of the wearer's head, allowing the flip cover 2 to pivot upward or downward in front of the user's face.

[0048] The flip cover 2 is typically detachably connected to the mask body 1 via a pivoting connection mechanism 3. The pivoting position of the flip cover 2 includes at least a closed position and an open position. The closed position and the open position refer to the different angular positions of the flip cover 2 along the pivoting path.

[0049] When the flip cover 2 is in the closed position, the viewing window 20 of the flip cover 2 and the observation window 10 of the mask body 1 are fully or partially aligned. That is, there is an overlapping area between the protective lens inside the observation window 10 and the protective lens inside the viewing window 20, which can provide double protection for the user's eyes. Full or partial alignment means that they overlap in the user's line of sight when the mask is worn.

[0050] When the flip cover 2 is in the open position, the viewing window 20 of the flip cover 2 and the observation window 10 of the mask body 1 are completely or partially offset, meaning that there is a non-overlapping area between the protective lens inside the observation window 10 and the protective lens inside the viewing window 20. Complete or partial offset means that when the user is wearing the mask, the protective lens inside the viewing window 20 of the flip cover 2 is offset from the user's line of sight, with only the protective lens of the observation window 10 of the mask body 1 remaining in the user's line of sight.

[0051] To ensure that the flip-type mask fits the user's head and facial contours, the outlines of the mask body 1 and the flip cover 2 are usually designed to avoid a standard circular shape. In traditional flip-type masks, the flip cover 2 fits snugly against the mask body 1 when closed, but when the flip cover 2 is pivoted upwards to the open position, there is usually a gap between the flip cover 2 and the mask body 1, which can easily allow debris such as welding slag to enter and cause contamination.

[0052] In this invention, a sealing part 21 is provided on the lower side of the viewing window 20 of the flip cover 2, and a first mating part 11 is provided on the upper side of the observation window 10 of the mask body 1. When the flip cover 2 is in the open position, the sealing part 21 engages with the first mating part 11 to close the gap between the flip cover 2 and the mask body 1.

[0053] The closure part 21 and the first mating part 11 can be independently designed components, respectively installed on the flip cover 2 and the mask body 1, or they can be directly formed at corresponding positions on the flip cover 2 and the mask body 1. The closure part 21 and the first mating part 11 can be configured as components with mutually matching shapes, and the materials can be flexible or rigid.

[0054] By setting the sealing part 21 to engage with the first mating part 11, the gap between the flip cover 2 and the mask body 1 is sealed when the flip cover 2 is in the open position, which can prevent welding slag and other debris from entering and causing pollution.

[0055] The closure part 21 can be provided on the bottom edge of the flip cover 2 or on the inner surface of the flip cover 2. Meanwhile, the first mating part 11 is located on the top edge of the mask body 1 or on the outer surface of the mask body 1.

[0056] Preferably, the closing part 21 is provided on the bottom edge of the flip cover 2, and the first mating part 11 is provided on the top edge of the mask body 1. When the flip cover 2 is in the open position, the bottom edge of the flip cover 2 and the top edge of the mask body 1 are connected to form a closed whole through the engagement of the closing part 21 and the first mating part 11.

[0057] In traditional face masks, there is a gap between the flap 2 and the mask body 1. When the flap 2 is in the open position, the mask body 1 needs to extend beyond the bottom edge of the flap 2 to provide additional protection and prevent debris such as welding slag from entering the gap and injuring the wearer. In contrast, in this invention, the portion of the mask body 1 above the bottom edge of the flap 2, i.e., the portion of the mask body 1 above the first mating part 11, can be omitted, thereby reducing the weight of the mask body 1 and achieving lightweight design.

[0058] Figure 4 A schematic diagram of the internal structure of the flip cover is shown.

[0059] like Figure 4As shown, the closing part 21 includes at least a first abutting surface 211, and the first mating part 11 includes at least a first receiving surface 111. The first abutting surface 211 and the first receiving surface 111 are substantially parallel to the pivoting direction of the flip cover 2. When the flip cover 2 is in the open position, the first abutting surface 211 abuts against the first receiving surface 111.

[0060] The first abutting surface 211 and the first receiving surface 111 are essentially parallel planes formed by the closing part 21 and the first mating part 11, respectively. When they abut, they form a surface-to-surface fit, thereby forming a seal in the pivoting direction of the flip cover 2. When there is a small angle between them, they form an intersection line between the surfaces, which can also form a seal.

[0061] Basically parallel means that the angle between the parallel and the tangent of the pivot trajectory is close to 0 degrees, but deviations within 5 degrees or 10 degrees are allowed. Preferably, the first receiving surface 111, the first abutting surface 211 and the pivot direction are parallel to each other.

[0062] like Figure 4 As shown, the closing part 21 includes at least a second abutting surface 212, and the first mating part 11 includes at least a second receiving surface 112; the second abutting surface 212 and the second receiving surface 112 form a non-zero angle with the pivot direction of the flip cover 2, and when the flip cover 2 is in the open position, the second abutting surface 212 abuts against the second receiving surface 112.

[0063] A non-zero included angle refers to the included angle formed between the second contact surface 212 and the tangent of the pivot direction of the flip cover 2, and between the second receiving surface 112 and the tangent of the pivot direction of the flip cover 2, preferably a 90-degree angle, forming a perpendicular relationship.

[0064] The second contact surface 212 and the second receiving surface 112 are basically parallel planes formed by the closing part 21 and the first mating part 11, respectively. When they come into contact, they form a surface-to-surface fit relationship, thereby forming a seal in a pivot direction that is not parallel to or is basically perpendicular to the flip cover 2. When there is a small angle between them, they form an intersection line between the surfaces, which can also form a seal.

[0065] When there are two intersecting surfaces of the closed part 21 and the first mating part 11 at the same time, this arrangement can prevent the intrusion of welding slag and other debris even if there is a certain gap between the corresponding surfaces.

[0066] Preferably, the engagement position between the closed portion 21 and the first mating portion 11 is made of an elastic material.

[0067] Preferably, the second contact surface 212 is substantially perpendicular to the first contact surface 211. Even if there is a certain gap between the corresponding surfaces, the gap formed is a right-angled fold, which can also prevent the intrusion of debris such as welding slag.

[0068] According to one embodiment of the present invention, the closing part 21 and the first mating part 11 may also be configured as a stepped or sawtooth mating relationship or a curved surface mating relationship. For example, stepped or sawtooth structures that fit each other are provided on their respective surfaces, and when the two are joined, a closure is formed.

[0069] Back Figure 3 A second mating part 12 is provided on the lower side of the observation window 10 of the mask body 1. When the flip cover 2 is in the closed position, the sealing part 21 engages with the second mating part 12 to close the gap between the flip cover 2 and the mask body 1.

[0070] That is, the mating structure of the closed part 21 and the second mating part 12 can also adopt various structures of the closed part 21 and the first mating part 11 or combinations thereof.

[0071] By setting the closing part 21 to engage with the first mating part 11 and the second mating part 12 respectively, the flip cover 2 can form a closed whole with the mask body 1 regardless of whether it is in the open or closed position, thus preventing the intrusion of debris such as welding slag.

[0072] like Figure 4 As shown, a first limiting surface 213 is provided inside the flip cover 2, such as Figure 3 As shown, a second limiting surface 113 is provided on the outside of the mask body 1; when the flip cover 2 is in the open position, the first limiting surface 213 abuts against the second limiting surface 113; the first limiting surface 213 and the second limiting surface 113 are basically perpendicular to the pivot direction of the flip cover 2 or form a non-zero angle with the pivot direction of the flip cover 2.

[0073] The flip cover 2 has a first limiting surface 213 inside, meaning that the first limiting surface 213 can be set on the inner surface of the flip cover 2. The mask body 1 has a second limiting surface 113 outside, meaning that the second limiting surface 113 can be set on the outer surface of the mask body 1. The two are in corresponding positions. When the flip cover 2 pivots from the closed position to the open position, the first limiting surface 213 and the second limiting surface 113 fit together or intersect, preventing the flip cover 2 from continuing to pivot.

[0074] The first limiting surface 213 and the second limiting surface 113 can be configured as multiple sets that are related to each other or independent of each other, or they can be configured as multiple sets that are not parallel to each other. Preferably, the first limiting surface 213 and the second limiting surface 113 are perpendicular to the pivot direction of the flip cover 2, which provides the best limiting effect.

[0075] According to one embodiment of the present invention, the first limiting surface 213 and the second limiting surface 113 can be replaced by the corresponding surfaces of the closing part 21 and the first mating part 11.

[0076] Similarly, between the closing part 21 and the second mating part 12, there is also a limiting structure similar to the first limiting surface 213 and the second limiting surface 113, so as to prevent the flip cover 2 from continuing to pivot when it pivots from the open position to the closed position.

[0077] According to one embodiment of the present invention, the pivoting connection mechanism 3 is configured such that when the flip cover 2 is in the closed position, at least one contour point on the flip cover 2 has a radial distance from the pivot axis to less than the maximum radial distance from the contour line of the mask body 1 to the pivot axis within the pivot angle from the closed position to the open position in the same circumferential plane; during the process of the flip cover 2 pivoting from the closed position to the open position, the radial distance from any contour point on the flip cover 2 to the pivot axis is greater than the radial distance from the contour point of the mask body 1 to the pivot axis within the same circumferential angle.

[0078] To ensure that the flip-type mask fits the user's head and facial contours, the outlines of the mask body 1 and the flip cover 2 are usually designed to avoid a standard circular shape. In particular, the viewing window 20 of the flip cover 2 and the observation window 10 of the mask body 1 are usually set parallel to the user's face.

[0079] Taking a point in the viewing window 20 of the flip cover 2 as an example, when the flip cover 2 is in the closed position, in order to form a better field of view, the viewing window 20 needs to be set closer to the observation window 10 of the mask body 1. However, this setting will cause a motion interference problem, that is, when the flip cover 2 pivots upwards by the same radius, because the viewing window 20 is too close to the observation window 10, the center of the viewing window 20 will interfere with the top of the observation window 10. In the design of a traditional flip cover 2 type mask, this interference needs to be avoided.

[0080] In this invention, to achieve a good viewing experience for the user, when the flip cover 2 is in the closed position, the viewing window 20 is positioned close to the observation window 10 of the mask body 1. The proximity is set such that at least one contour point on the flip cover 2 would interfere with the mask body 1 if a pivot of equal radius were performed. Specifically, when the flip cover 2 is in the closed position, the radial distance from at least one contour point on the flip cover 2 to the pivot axis is less than or equal to the maximum radial distance from the contour line of the mask body 1 to the pivot axis within the pivot angle from the closed position to the open position in the same circumferential plane.

[0081] The radial distance from the outline point to the pivot axis refers to the static radius of the outline point when the flip cover 2 is in the closed position.

[0082] The same circumferential plane refers to the pivot plane of a certain contour point on the flip cover 2. The pivot angle from the closed position to the open position refers to the angle swept by a certain contour point on the flip cover 2 during the pivoting process. The mask body 1 is within the above-mentioned pivot plane, and the contour line can be extracted within the above-mentioned angle.

[0083] In this invention, the viewing window 20 is moved closer to the observation window 10 until any point on the outline of the aforementioned mask body 1 inevitably interferes with a certain outline point on the aforementioned flip cover 2. That is, the flip cover 2 tends to move closer to the mask body 1 in the closed position. The degree of proximity is set to the extent that if the two pivot with equal radius, they will inevitably interfere. The above-mentioned arrangement of this invention makes the proximity between the viewing window 20 of the flip cover 2 and the observation window 10 of the mask body 1 reach a level that would prevent the conventional flip cover 2 mask from operating due to motion interference.

[0084] Meanwhile, in this invention, by setting the structure of the pivoting connection mechanism 3, during the process of the flip cover 2 pivoting from the closed position to the open position, the radial distance from any contour point on the flip cover 2 to the pivot axis is greater than the radial distance from the contour point of the cover body 1 at the same circumferential angle to the pivot axis.

[0085] The contour point with the same circumferential angle as any contour point on the flip cover 2 refers to: taking any contour point on the flip cover 2, taking a ray passing through the contour point and perpendicular to the pivot axis, and the intersection of the ray with the mask body 1.

[0086] When the radial distance from any contour point on the flip cover 2 to the pivot axis is greater than the radial distance from the contour point of the mask body 1 at the same circumferential angle to the pivot axis, during the pivoting process, any contour point of the flip cover 2 avoids interference with the mask body 1.

[0087] The pivoting connection mechanism 3 is configured to control the flip cover 2 to pivot along a specific trajectory, thereby preventing interference between the flip cover 2 and the mask body 1. The trajectory can be selected from various forms, such as curves or broken lines. This invention does not limit the specific form of the trajectory; as long as it achieves the aforementioned function of preventing interference, it is considered an equivalent of the pivoting connection mechanism 3 of this invention.

[0088] Figure 5 An exploded view of the side of the flip-up face mask is shown.

[0089] Figure 6 An exploded view of the side of the flip-up mask is shown from another angle.

[0090] like Figure 5 and Figure 6As shown, the pivoting connection mechanism 3 is disposed on the side of the mask body 1; the pivoting connection mechanism 3 includes a first connecting rod 31, a spring-loaded member 33, and a second connecting rod 32. One end of the first connecting rod 31 is connected to the mask body 1 through a first rotating joint 310, and the other end is connected to the connection point 22 of the flip cover 2 through a linear sliding joint 340 extending along the axial direction of the first connecting rod 31; the spring-loaded member 33 is disposed between the first rotating joint 310 and the connection point 22 of the flip cover 2, and pulls the connection point 22 of the flip cover 2 toward the first rotating joint 310; one end of the second connecting rod 32 is connected to the mask body 1 through a second rotating joint 320, and the other end is connected to the connection point 22 of the flip cover 2 through a third rotating joint 330; the sum of the lengths of the linear sliding joint 340 and the first connecting rod 31 is greater than or equal to the sum of the distance between the first rotating joint 310 and the second rotating joint 320 and the length of the second connecting rod 32. Alternatively, the length of the first link 31 is greater than or equal to the sum of the distance between the first rotary joint 310 and the second rotary joint 320 and the length of the second link 32; the distance between the first rotary joint 310 and the observation window 10 of the mask body 1 is greater than the distance between the second rotary joint 320 and the observation window 10 of the mask body 1; the angle between the first link 31 and the second link 32 at the connection point 22 of the flip cover 2 is an acute angle.

[0091] The pivoting connection mechanism 3 is configured as a linkage structure. The connection point 22 of the first linkage 31 and the second linkage 32 on the flip cover 2 is the same point, which can be configured as a cantilever beam structure.

[0092] The connection point 22 of the flip cover 2 is restricted on the first link 31 by the linear sliding joint 340 on the first link 31 and is tightened by the spring-loaded member 33, so that it can rotate around the first rotating joint 310 with a variable diameter. At the same time, the connection point 22 of the flip cover 2 is restricted on the second link 32 by the third rotating joint 330, so that it can rotate around the second rotating joint 320 with a constant radius.

[0093] The distance between the first rotary joint 310 and the observation window 10 of the mask body 1 is greater than the distance between the second rotary joint 320 and the observation window 10 of the mask body 1. When the flip cover 2 pivots from the closed position to the open position, the first connecting rod 31 rotates towards the second rotary joint 320, then crosses the second rotary joint 320 and continues to rotate away from the second rotary joint 320. Specifically, the position of the second rotary joint 320 is higher than the position of the first rotary joint 310. Preferably, the intersection line of the plane containing the axes of the first rotary joint 310 and the second rotary joint 320 and the mask body 1 passes through the farthest point of the mask body 1 from the first rotary joint 310.

[0094] To prevent the connection point 22 of the flip cover 2 from disengaging from the first link 31 during rotation, the length of the first link 31 is set to be greater than or equal to the sum of the distance between the first revolute joint 310 and the second revolute joint 320 and the length of the second link 32. When the linear sliding joint 340 is configured to extend outward from the end of the first link 31, the sum of the lengths of the extended portion of the linear sliding joint 340 and the first link 31 is greater than or equal to the sum of the distance between the first revolute joint 310 and the second revolute joint 320 and the length of the second link 32.

[0095] The first link 31 and the second link 32 are connected to the connection point 22 of the flip cover 2, and the angle between them at the connection point 22 is acute. When the flip cover 2 is in the closed position, the second link 32 is above the first link 31, and the angle between them is acute. As the flip cover 2 pivots upward, the angle between the first link 31 and the second link 32 at the connection point 22 gradually decreases until the first link 31 and the second link 32 are parallel. At this time, the distance between the connection point 22 of the flip cover 2 and the first rotating joint 310 is the sum of the distance between the first rotating joint 310 and the second rotating joint 320 and the length of the second link 32. When the flip cover 2 continues to pivot upward until it reaches the open position, the first link 31 is above the second link 32, and the angle between them remains acute.

[0096] The terms "above" or "above" refer to the user's relative position when wearing a mask.

[0097] According to one embodiment of the present invention, the first rotating pair 310 includes a first shaft or a first cantilever beam disposed on the side of the mask body 1, and a first bushing disposed on the first connecting rod 31. The first bushing is sleeved on the first shaft or the first cantilever beam, so that the first connecting rod 31 can rotate around the first shaft or the first cantilever beam.

[0098] The first shaft or the first cantilever beam extends laterally from the side of the mask body 1. The first connecting rod 31 is connected to the mask body 1 at one end with a first bushing, and the two are rotatably engaged. When the first connecting rod 31 rotates around the first shaft or the first cantilever beam, the connection point 22 of the flip cover 2 at the other end of the first connecting rod 31 rotates around the axis of the first shaft or the first cantilever beam with a changing diameter.

[0099] An axis is provided through the side of the mask body 1. A cantilever beam is formed on the surface of the mask body 1 and extends laterally.

[0100] According to one embodiment of the present invention, the linear sliding pair 340 includes a first slide rail disposed on the first connecting rod 31 and a connection point 22 disposed on the flip cover 2, so that the connection point 22 can slide linearly along the first slide rail.

[0101] According to one embodiment of the present invention, the spring-loaded member 33 includes a tension spring or a torsion spring. For example, the two ends of the spring are respectively fixed to the first link 31 near the first bushing and the connection point 22 of the flip cover 2, and have an elastic force that pulls the connection point 22 of the flip cover 2 toward the first bushing, the direction of which is consistent with the direction of the motion degree of freedom provided by the linear sliding pair 340.

[0102] A matching structure is formed between the connection point 22 of the first slide rail and the flip cover 2. For example, the connection point 22 of the flip cover 2 is provided with a slider, which is embedded in the first slide rail. When the slider moves linearly along the first slide rail, the connection point 22 of the flip cover 2 moves away from or closer to the axis of the first shaft or the first cantilever beam.

[0103] According to one embodiment of the present invention, the second rotating joint 320 includes a second shaft or a second cantilever beam disposed on the side of the mask body 1, and a second bushing disposed on the second connecting rod 32. The second bushing is sleeved on the second shaft or the second cantilever beam, so that the second connecting rod 32 can rotate around the second shaft or the second cantilever beam.

[0104] The third rotating joint 330 includes a third bushing disposed on the second connecting rod 32 and a connection point 22 disposed on the flip cover 2. The third bushing is sleeved on the connection point 22, so that the connection point 22 can rotate around the second axis or the second cantilever beam.

[0105] The structures of the first rotating joint 310 and the second bushing, as well as the structures of the third rotating joint 330 and the third bushing, can all be set with reference to the first rotating joint 310 and the first bushing, so that when the second connecting rod 32 rotates around the second axis or the second cantilever beam, the connection point 22 of the flip cover 2 at the other end of the second connecting rod 32 rotates around the second axis or the second cantilever beam with an equal radius, the radius of rotation being the length of the second connecting rod 32.

[0106] The process of flip cover 2 pivoting from the closed position to the open position is as follows:

[0107] When the flip cover 2 is in the closed position, the first link 31 and the second link 32 intersect at the connection point 22 of the flip cover 2 to form an acute angle, with the first link 31 located below the second link 32.

[0108] When the flip cover 2 pivots away from the closed position, the flip cover 2 pivots around the axis of the first axis or the axis of the first cantilever beam with a gradually increasing radius, and at the same time pivots around the axis of the second axis or the axis of the second cantilever beam with an equal radius, and the distance between the flip cover 2 and the front part of the mask body 1 gradually increases.

[0109] When the flip cover 2 pivots to the farthest point from the axis of the first shaft or the first cantilever beam, the first connecting rod 31 and the second connecting rod 32 are parallel and collinear, and the farthest interference point between the flip cover 2 and the mask body 1 is avoided.

[0110] As the flip cover 2 continues to pivot toward the open position, the first link 31 is positioned above the second link 32, and the two intersect again at the connection point 22 of the flip cover 2, forming an acute angle. The flip cover 2 pivots around the axis of the first axis or the first cantilever beam with a gradually decreasing radius, while simultaneously pivoting around the axis of the second axis or the second cantilever beam with a constant radius, and the distance between the flip cover 2 and the mask body 1 gradually decreases.

[0111] When the flip cover 2 is pivoted to the open position, the flip cover 2 comes into contact with the mask body 1.

[0112] Figure 7 An exploded view of another type of flip-up face mask is shown.

[0113] like Figure 7 As shown, the pivoting connection mechanism 3 includes a first connecting rod 31, a spring-loaded component 33, and a swing track 34; one end of the first connecting rod 31 is connected to the mask body 1 through a first rotating joint 310, and the other end is connected to the connection point 22 of the flip cover 2 through a linear sliding joint 340; the spring-loaded component 33 is disposed between the first rotating joint 310 and the connection point 22 of the flip cover 2, and pulls the connection point 22 of the flip cover 2 tight along the movement direction of the linear sliding joint 340.

[0114] That is, in this scheme, the structure and connection relationship of the first connecting rod 31 and the spring-loaded component 33 are the same as those described above. Figure 5 , Figure 6 The implementation method is the same as that in the previous one, except that the function of the second link 32 is replaced by a swing track 34 formed on or fixed to the mask body 1.

[0115] The swing track 34 is formed on the mask body 1 or fixed on the mask body 1. The distance between the swing track 34 and the first rotating joint 310 is from near to far and then back to near, which is set so that the connection point 22 of the flip cover 2 slides along the swing track 34 and swings around the first rotating joint 310 with a variable diameter.

[0116] In this invention, the swing track 34 is no longer limited to an arc shape similar to the scheme of using the second link 32, which makes the connection point 22 of the flip cover 2 rotate around a certain point with equal radius. Optionally, the swing track 34 is a groove or a protrusion, and its shape is selected from any one of a circular arc segment, an elliptical arc segment, an involute segment, or a combination thereof.

[0117] Preferably, the swing track 34 can be set according to the outline of the mask body 1. The shape of the swing track 34 is basically consistent with the outline of the mask body 1, so that when the flip cover 2 is in the closed position, the viewing window 20 of the flip cover 2 is closer to the observation window 10 of the mask body 1. When the flip cover 2 pivots, it can run along the outline of the mask body 1, thereby maintaining the overall center of gravity of the mask stable.

[0118] Preferably, the connection point 22 between the swing track 34 and the flip cover 2 is engaged by a rolling friction device. The rolling friction device reduces resistance and wear between the two. According to one embodiment of the present invention, the connection point 22 of the flip cover 2 can straddle the swing track 34, and a rolling friction device, such as a ball bearing or roller, is provided to generate rolling friction.

[0119] Figure 8 An exploded view of another type of flip-up face mask is shown.

[0120] like Figure 8 As shown, the pivoting connection mechanism 3 is a dual rocker mechanism, including a first rocker 301 and a second rocker 302. One end of the first rocker 301 is connected to the mask body 1 through a first hinge 401, and the other end is connected to the first connection point 201 of the flip cover 2 through a second hinge 402. One end of the second rocker 302 is connected to the mask body 1 through a third hinge 403, and the other end is connected to the second connection point 202 of the flip cover 2 through a fourth hinge 404. The first hinge 401, the second hinge 402, the third hinge 403, and the fourth hinge 404 form the vertices of a closed quadrilateral. The open and closed positions of the flip cover are distributed on both sides of the point on which the flip cover 2 is furthest from the mask body 1 in the movement trajectory of the dual rocker mechanism.

[0121] The first hinge 401, the second hinge 402, the third hinge 403, and the fourth hinge 404 can be configured as a matching structure of a shaft and a bushing or a matching structure of a cantilever beam and a bushing. The opening and closing positions of the flip cover 2 are distributed on both sides of the position where the distance between the flip cover and the mask body reaches the maximum value in the motion trajectory of the dual rocker mechanism, and both positions pass through this maximum value position during the movement. This makes the distance between the flip cover and the mask body change non-linearly during the flipping process, realizing variable diameter flipping and avoiding interference.

[0122] Preferably, the dual rocker mechanism forms an equilateral quadrilateral in the working state, so as to ensure structural symmetry while enabling the flip cover to obtain a smooth and continuous variable diameter movement trajectory during the flipping process.

[0123] In this invention, when the flip cover is in the open position, the gap between the flip cover and the mask body is closed by setting a sealing part and a first mating part to engage, preventing welding slag and other debris from entering and causing contamination. By setting the sealing part at the bottom edge of the flip cover and the first mating part at the top edge of the mask body, the weight of the mask body is reduced, achieving lightweight design. By setting the viewing window of the flip cover close to the observation window of the mask body, the center of gravity of the mask is shifted backward, ensuring good visibility for the user. By setting a pivoting connection mechanism to control the flip cover's diameter-changing flipping, interference can be avoided during pivoting between the closed and open positions. By changing the diameter from small to large and then back to small, the flip cover engages with the mask body in both the open and closed positions. By setting the pivoting connection mechanism as a linkage structure, the flip cover's pivoting process is more stable, the overall center of gravity of the mask is stable, and wearing is more comfortable. By setting a swing track, the movement trajectory of the flip cover is controllable. By setting the swing track along the contour line of the mask body, the viewing window and the observation window are closer together, and the overall center of gravity of the mask is more stable.

[0124] While numerous embodiments of the invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of the invention. The appended claims are intended to define the scope of protection of the invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A flip-top face mask, characterized in that, include: The main body of the mask (1) and the flip cover (2); The flip cover (2) is connected to the mask body (1) via a pivoting connection mechanism (3), so that the flip cover (2) can pivot around the mask body (1) between a closed position and an open position. When the flip cover (2) is in the closed position, the viewing window (20) of the flip cover (2) is fully or partially aligned with the observation window (10) of the mask body (1). When the flip cover (2) is in the open position, the viewing window (20) of the flip cover (2) is fully or partially offset from the observation window (10) of the mask body (1). The pivoting connection mechanism (3) is configured as follows: When the flap (2) is in the closed position, at least one contour point on the flap (2) has a radial distance from the pivot axis that is less than the maximum radial distance from the contour line of the mask body (1) within the pivot angle from the closed position to the open position in the same circumferential plane to the pivot axis. During the process of the flip cover (2) pivoting from the closed position to the open position, the radial distance from any contour point on the flip cover (2) to the pivot axis is greater than the radial distance from the contour point of the cover body (1) at the same circumferential angle to the pivot axis.

2. The flip-top face mask according to claim 1, characterized in that, The pivoting connection mechanism (3) is located on the side of the mask body (1); The pivoting connection mechanism (3) includes a first link (31), a second link (32), and a spring-loaded component (33). One end of the first connecting rod (31) is connected to the mask body (1) via the first rotating joint (310), and the other end is connected to the connection point (22) of the flip cover (2) via the linear sliding joint (340) extending along the axial direction of the first connecting rod (31). The spring-loaded component (33) is disposed between the connection point (22) of the first rotating joint (310) and the flip cover (2), and pulls the connection point (22) of the flip cover (2) toward the first rotating joint (310); One end of the second connecting rod (32) is connected to the mask body (1) through the second rotating joint (320), and the other end is connected to the connection point (22) of the flip cover (2) through the third rotating joint (330). The distance between the first rotating joint (310) and the observation window (10) of the mask body (1) is greater than the distance between the second rotating joint (320) and the observation window (10) of the mask body (1); The angle between the first link (31) and the second link (32) at the connection point (22) of the flip cover (2) is an acute angle.

3. The flip-top face mask according to claim 2, characterized in that, The first rotating joint (310) includes a first shaft or a first cantilever beam disposed on the side of the mask body (1) and a first bushing disposed on the first connecting rod (31). The first bushing is sleeved on the first shaft or the first cantilever beam, so that the first connecting rod (31) can rotate around the first shaft or the first cantilever beam. And / or, The linear sliding pair (340) includes a first slide rail disposed on the first connecting rod (31) and a connection point (22) disposed on the flip cover (2), so that the connection point (22) can slide linearly along the first slide rail; And / or, The springback element (33) includes a tension spring or a torsion spring; And / or, The second rotating joint (320) includes a second shaft or a second cantilever beam disposed on the side of the mask body (1) and a second bushing disposed on the second connecting rod (32). The second bushing is sleeved on the second shaft or the second cantilever beam, so that the second connecting rod (32) can rotate around the second shaft or the second cantilever beam. And / or, The third rotating pair (330) includes a third bushing disposed on the second connecting rod (32) and a connection point (22) disposed on the flip cover (2). The third bushing is sleeved on the connection point (22), so that the connection point (22) can rotate around the second axis or the second cantilever beam.

4. The flip-top face mask according to claim 1, characterized in that, The pivoting connection mechanism (3) includes a first link (31), a spring-loaded component (33), and a swing track (34). One end of the first connecting rod (31) is connected to the mask body (1) through the first rotating joint (310), and the other end is connected to the connection point (22) of the flip cover (2) through the linear sliding joint (340). The spring-loaded component (33) is disposed between the connection point (22) of the first rotating joint (310) and the flip cover (2), and pulls the connection point (22) of the flip cover (2) along the movement direction of the linear moving joint (340); The swing track (34) is formed on or fixed on the mask body (1). The distance between the swing track (34) and the first rotating joint (310) is from near to far and then back to near, so that the connection point (22) of the flip cover (2) slides along the swing track (34) around the first rotating joint (310) to swing with a variable diameter.

5. The flip-top face mask according to claim 4, characterized in that, The first rotating joint (310) includes a first shaft or a first cantilever beam disposed on the side of the mask body (1) and a first bushing disposed on the first connecting rod (31). The first bushing is sleeved on the first shaft or the first cantilever beam, so that the first connecting rod (31) can rotate around the first shaft or the first cantilever beam. And / or, The linear sliding pair (340) includes a first slide rail disposed on the first connecting rod (31) and a connection point (22) disposed on the flip cover (2), so that the connection point (22) can slide linearly along the first slide rail; And / or, The springback element (33) includes a tension spring or a torsion spring; And / or, The swing track (34) is a groove or a protrusion, the shape of which is selected from any one of a circular arc segment, an elliptical arc segment, an involute segment, or a combination thereof.

6. The flip-top face mask according to claim 5, characterized in that, The swing track (34) and the connection point (22) of the flip cover (2) are connected by a rolling friction device.

7. The flip-top face mask according to any one of claims 2 to 6, characterized in that, The connection point (22) of the flip cover (2) is set as a cantilever beam structure.

8. The flip-top face mask according to claim 1, characterized in that, The flip cover (2) and the mask body (1) are engaged in the open and closed positions, respectively.

9. The flip-top face mask according to claim 1, characterized in that, The pivoting connection mechanism (3) is a dual rocker mechanism, including a first rocker (301) and a second rocker (302). One end of the first rocker arm (301) is connected to the mask body (1) via the first hinge (401), and the other end is connected to the first connection point (201) of the flip cover (2) via the second hinge (402). One end of the second rocker (302) is connected to the mask body (1) via the third hinge (403), and the other end is connected to the second connection point (202) of the flip cover (2) via the fourth hinge (404). The first hinge (401), the second hinge (402), the third hinge (403), and the fourth hinge (404) form the vertices of a closed quadrilateral; The open and closed positions of the flip cover (2) are located on both sides of the point on which the flip cover (2) is furthest from the mask body (1) in the motion trajectory of the double rocker mechanism.

10. The flip-top face mask according to claim 1, characterized in that, The flip cover (2) is provided with a first limiting surface (213) inside, and the mask body (1) is provided with a second limiting surface (113) outside. When the flip cover (2) is in the open position, the first limiting surface (213) abuts against the second limiting surface (113); The first limiting surface (213) and the second limiting surface (113) are substantially perpendicular to the pivot direction of the flip cover (2) or form a non-zero angle with the pivot direction of the flip cover (2).

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