CN215779129U

CN215779129U - Detachable connecting device for mask

Info

Publication number: CN215779129U
Application number: CN202022880566.1U
Authority: CN
Inventors: 吴子乾
Original assignee: Tecmen Electronics Co Ltd
Current assignee: Tecman Nanjing Safety Protection Equipment Co ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2022-02-11
Anticipated expiration: 2030-12-03

Abstract

The application discloses a can dismantle connecting device for face guard includes: a pair of first members for connection to a first fitting secured to the head of a user; and a pair of second components detachably connected to the pair of first components, respectively, for connection to the mask or to a second fitting secured to the head of the user, each first component comprising a first member and a second member pivotally connected to each other, the second member comprising a linear section; a pair of first components defining a first pivot axis upon connection to the first fitting; each second assembly has a structure engageable with a respective rectilinear section, a pair of the second assemblies defining a second pivot axis about which the mask is pivotable upon engagement with the rectilinear sections of the respective second members, the second pivot axis being parallel to the first pivot axis, the second pivot axis being selectively rectilinearly movable relative to the first pivot axis parallel to the rectilinear sections as viewed in a plane perpendicular to the first and second pivot axes.

Description

Detachable connecting device for mask

Technical Field

The present application relates to a detachable connection device for a mask, in particular a welding mask, by means of which the mask can be detachably connected to different fittings fixed to the head of a user.

Background

In industrial and civil fields, various masks are widely used. In the case of a welding site, for example, a welding worker typically wears a welding helmet to protect the face and glasses from harmful light and welding spatter. The welding helmet is generally mounted on a headband structure that is worn directly on the head of the welder. However, in some work sites where there is a risk of accidents, it is necessary to wear safety helmets. In this case, the welding helmet may be detached from the headgear structure and then attached to the helmet again. Thus, welding masks may be equipped with removable attachment means for attachment to various accessories, such as headgear structures or headgear, etc.

With such a detachable connection device of the prior art, after the welding mask is mounted on the helmet, the welding mask cannot be completely turned over from the front of the user's face to the top of the head, so that the user must repeatedly remove and wear the helmet to which the welding mask is connected if he needs to observe the welding operation site, which increases the burden of the on-site welding operation.

In addition, after the welding mask is connected to the helmet by the detachable connecting device in the prior art, the rotating axis can be close to the front of the face of the user in the pivoting process because the welding mask cannot move back and forth relative to the rotating axis of the helmet, so that the user can feel the discomfort that the welding mask is excessively close to the front and the head of the user is forced to be lowered. Wear the safety helmet of connecting welding face guard like this for a long time and carry out welding operation, will influence work efficiency, increase user's fatigue and feel.

SUMMERY OF THE UTILITY MODEL

To the above problem, the present application aims to provide an improved detachable connection device for a mask, in particular a welding mask, such that the mask can be easily flipped over the head of a user as required after being connected to a fitting fixed to the head of the user via such detachable connection device, and the pivot axis can be as close as possible to the back of the head of the user when flipped, reducing the head burden of the user.

According to one aspect of the present application, there is provided a detachable connection device for a mask, comprising:

a pair of first members for connection to a first fitting secured to the head of a user; and

a pair of second components detachably connected to the pair of first components, respectively, the second components being adapted to be connected to a mask or to a second fitting fixed to the head of a user, the second fitting being different from the first fitting,

each of the first assemblies includes a first member and a second member pivotally connected to each other, the first member having a snap-fit structure for removably connecting to the first fitting, the first member being stationary after being removably connected to the first fitting, the second member including a linear section;

the pair of first assemblies defining a first pivot axis upon connection to the first fitting, the second member being pivotable relative to the first member about the first pivot axis;

each of the second assemblies has a structure engageable with the respective rectilinear section to slide rectilinearly along the rectilinear section, the pair of second assemblies defining a second pivot axis upon engagement with the rectilinear sections of the respective second members about which the mask is pivotable, the second pivot axis being parallel to the first pivot axis, and the second pivot axis being selectively rectilinearly movable parallel to the rectilinear section relative to the first pivot axis, as viewed in a plane perpendicular to the first and second pivot axes.

Optionally, at least one of the pair of second assemblies is provided with a rotational locking means to lock the position of the mask about the second pivot axis.

Optionally, the pair of first components are arranged in mirror symmetry with respect to a vertical mid-plane of the first fitting and the pair of second components are arranged in mirror symmetry with respect to a vertical mid-plane of the mask and/or second fitting.

Optionally, where the mask is connected to the first fitting via the detachable connection, the mask, when in front of the first fitting, is behind and/or below the second pivot axis, as viewed in a plane perpendicular to the first and second pivot axes.

Optionally, each said second assembly comprises a cantilever arm having a slideway formed at one end thereof to define a formation for slidable engagement with said linear section, and a pivotal connection formation provided at the other end of the cantilever arm opposite the slideway to define said second pivot axis.

Optionally, the pivotal connection structure includes a knob and a threaded member engaged with the knob, the threaded member including a head and a shank extending perpendicularly from the head, the shank being provided with an internally threaded bore for threading through the cantilever arm into the externally threaded post of the knob.

Optionally, the outer contour of the handle has a non-circular cross-section and the handle passes through an opening formed in a housing wall of the mask complementary to the non-circular cross-section, the housing wall of the mask being sandwiched between the knob and the cantilever arm and only the knob being exposed with respect to the mask.

Optionally, the rotational locking means comprises a notch formed in the cantilever and a toggle button mounted radially movably in the head, the toggle button having a bend, the toggle button being movable between a locked position in which the bend engages within the notch to prevent pivoting of the mask relative to the cantilever and an unlocked position in which the bend disengages from the notch to allow pivoting of the mask relative to the cantilever.

Optionally, at least one of the pair of second assemblies is provided with a rotation locking device comprising:

a ratchet wheel mounted on the handle in a non-pivotable manner about the second pivot axis relative to the threaded members; and

a pawl movably mounted in the cantilever arm, the pawl movable between a locked position engaging the ratchet to prevent pivoting of the visor relative to the cantilever arm and an unlocked position disengaging from the ratchet to allow pivoting of the visor relative to the cantilever arm.

Optionally, a receiving receptacle is formed in the cantilever to receive the pawl, and a seat receiving a coil spring is also received in the receiving receptacle, the coil spring being located between the seat and the pawl to apply a resilient force tending to separate the two from each other.

Optionally, the toggle button is formed with a protrusion on a side thereof facing the head, two through holes are formed in the head, one of the two through holes defining the locked position when receiving the protrusion and the other defining the unlocked position when receiving the protrusion.

Optionally, the first accessory is a headgear and the second accessory is a headband structure.

In the context of the present application, terms relating to directionality such as "front", "rear", "left", "right", "upper", "lower" are referenced to a user wearing a headband structure or headgear to which the removable attachment of the present application is attached. For example, the face shield being located in front of the headgear means that the face shield is located in front of or partially in front of the headgear in the direction of the wearer's line of sight; the mask being located above the helmet means that the mask is located above the helmet in the height direction of the wearer.

By adopting the technical means, the mask can be conveniently and easily switched and connected between different fittings fixed on the head of a user, and meanwhile, when the mask is connected with the fittings such as a safety helmet, the user can conveniently and easily turn the mask over the safety helmet, so that the mask can be conveniently and easily inspected by naked eyes at any time, and the workload of the user is reduced.

Drawings

The principles and aspects of the present application will be more fully understood from the following detailed description, taken in conjunction with the accompanying drawings. It is noted that the drawings may not be to scale for clarity of illustration and will not detract from the understanding of the present application. In the drawings:

FIG. 1 schematically illustrates an example of a welding helmet connected to a helmet using a connection arrangement according to the prior art;

FIG. 2 schematically illustrates a detachable connection arrangement according to an embodiment of the present application, wherein portions 2a to 2e of FIG. 2 schematically illustrate that a welding helmet may be attached to a headgear structure or headgear using the detachable connection arrangement;

FIGS. 3a to 3c schematically illustrate how a welding helmet may be moved relative to the helmet after being attached to the helmet using the detachable connection device of an embodiment of the present application;

FIG. 4 schematically illustrates a welding helmet having a second component with a detachable connection arrangement according to an embodiment of the present application attached thereto;

parts

4a and 4b of fig. 4 respectively show the dashed circle parts of fig. 4 in an enlarged scale to show how the second assembly is unlocked to allow pivoting of the welding helmet;

FIG. 5 schematically illustrates an exploded view of a second component of a detachable connection apparatus according to an embodiment of the present application;

figures 6a and 6b schematically show a cross-sectional view of a second component of a detachable connection device according to an embodiment of the present application in different states;

FIG. 7 schematically illustrates a welding helmet having a second component with a detachable connection arrangement according to another embodiment of the present application attached thereto;

FIG. 8 schematically illustrates an exploded view of a second component of the detachable connection device of FIG. 7; and

figures 9a and 9b schematically show a cross-sectional view of the second component of the detachable connection device of figure 8 in different states.

Detailed Description

In the various figures of the present application, features that are structurally identical or functionally similar are denoted by the same reference numerals.

Fig. 1 schematically shows an example of a welding helmet 200 connected to a helmet 100 using a connecting device 300 according to the prior art. The connection device 300 is a connection device that can be detachably connected to the welding helmet 200 and the helmet 100, respectively. The attachment device 300 is removably attachable to the headgear 100 at a location 310 thereof, and the attachment device 300 is removably attachable to the welding helmet 200 at a location 320 thereof. In addition, between the

portions

310 and 320, the connecting device 300 is further provided with a pivot fitting pair 330. Meanwhile, the connection mode at the connection portion 320 is also a pivot fitting pair. In addition, the attachment device 300 may be detached from the headgear 100 at a portion 310 thereof and removably attached to a headband structure, not shown in the figures.

With further reference to fig. 1, in the case where the welding helmet 200 is connected to the helmet 100 via the prior art connection 300, the welding helmet 200 cannot be flipped over to the top of the helmet 100 around the

region

320 or 330. In this way, each time the user needs to observe the welding site, the helmet 100 connected to the welding helmet 200 needs to be repeatedly taken off and put on, which significantly increases the workload of the user. In addition, because the pivot mating pair 330 and the pivot location 320 are relatively forward, the pivoting force is forward during pivoting of the welding helmet 200 relative to the helmet 100, thereby subjecting the user's head to more force closer to the front, thereby affecting the comfort of the helmet 100.

Parts 2a to 2e of fig. 2 schematically show a detachable connection device according to an embodiment of the present application. In the embodiments described below, the welding helmet 200, the hard hat 100, and the headband structure 600 will be exemplified as an example of how they are respectively connected using the detachable connection device of the present application. However, it will be apparent to those skilled in the art that the detachable connection arrangement of the present application may be used to connect masks for other purposes, such as medical masks or other suitable fittings that are secured directly to the head of a user.

According to an embodiment of the present application, the detachable connection device comprises a first component 400 and a second component 500. The first assembly 400 can be used to removably attach the hard hat 100. Here, the helmet 100 may be considered a first accessory that is directly secured to the head of a user. The second assembly 500 can be used to removably attach a mask, such as the welding helmet 200, and can also be used to removably attach the headgear structure 600. Here, the headband structure 600 may be considered a second fitting that is secured directly to the head of a user, the second fitting being different from the first fitting. Meanwhile, the first module 400 and the second module 500 may be detachably connected to each other. In this way, a user may connect the welding helmet 200 to the headgear structure 600 using the second component 500 of the detachable connection arrangement, or alternatively connect the welding helmet 200 to the headgear 100 using the entire detachable connection arrangement, depending on the application.

With further reference to portions 2 a-2 e of fig. 2, the first assembly 400 may be a pair of first assemblies 400 arranged in mirror symmetry with respect to a vertical mid-plane of the helmet 100, and the second assembly 500 may also be a pair of second assemblies 500 arranged in mirror symmetry with respect to a vertical mid-plane of the welding helmet 200. In the context of the present application, the "vertical mid-plane" of a fitting such as a headband structure or a headgear means a plane that is evenly split left and right perpendicular to the horizontal plane when the headband structure or headgear is normally worn. "mirror symmetry" means that two features are arranged mirror-image of each other with respect to a plane of symmetry, while the two features may have substantially the same feature or different features. The pair of first components 400 may be attached to the left and right sides of the helmet 100, respectively, and the pair of second components 500 may be attached to the left and right sides of the welding helmet 200 or the left and right sides of the headband structure 600, respectively. Each first assembly 400 includes a first member 410 and a second member 420, the first member 410 being pivotally connected to the second member 420 at a pivotal connection 430. A snap structure 411 is formed on the first member 410 so as to be inserted into the opening 111 formed in the helmet 100 and snap-fixed thereto, so that the first member 410 cannot move with respect to the helmet 100. For example, the snap features 411 may be formed as resiliently deflectable tabs so as to deflect inwardly when inserted into the opening 111 and outwardly after passing through the opening 111 so that the first assembly 400 can be lockingly secured to the headgear 100. When disassembly is desired, the snap features 411 may be withdrawn from the opening 111 by pressing inwardly on the tabs of the snap features 411, so that the first component 400 is disconnected from the headgear 100. After the pair of first assemblies 400 are coupled to the hard hat 100, the pivotal coupling structure 430 of the first assemblies 400 defines a first pivot axis O1 such that the second member 420 can pivot relative to the first member 410 about the first pivot axis O1. It should be clear to one skilled in the art that the pivotal connection 430 can be configured such that the pivoting of the second member 420 relative to the first member 410 is damped, i.e., the pivotal movement between the two is constrained by a certain damping force, preventing unintentional pivoting.

The second member 420 of the first assembly 400 is substantially L-shaped such that a linear section 421 is formed on the second member 420. The pair of second assemblies 500 are pivotably connected to the welding helmet 200, primarily inside the shell of the welding helmet 200. In the context of the present application, the inside of the mask means the side of the mask that is directed towards the head of the wearer, and the outside of the mask means the side of the mask that is directed away from the head of the wearer. Each second assembly 500 includes a cantilever arm 510 (shown in fig. 5) and a pivotal connection structure consisting of a knob 520 and a threaded member 530 engaged with the knob 520, and the cantilever arm 510 is pivotably connected to the welding helmet 200 via the pivotal connection structure. When the pair of second assemblies 500 are simultaneously connected to the welding helmet 200, the pivotal connections of the two second assemblies 500 collectively define a second pivot axis O2.

With further reference to fig. 5, at one end of the cantilever 510 of each second assembly 500 is formed a slide 510b, for example in the form of a pair of grooves open opposite each other. The slideway 510b is engageable with the linear section 421 of the second member 420 of the first assembly 400 so that the cantilever 510 of the second assembly 500 can move linearly back and forth along the linear section 421 relative to the second member 420 of the first assembly 400. A projection 510c capable of extending and contracting in a direction perpendicular to the linear movement direction of the cantilever 510 is formed between the slide ways 510b of the cantilever 510. Meanwhile, a plurality of apertures 422 capable of engaging the projection 510c are formed in the linear section 421 of the second member 420 of the first assembly 400. The tab 510c is normally in an extended state and is capable of being retracted by a force applied to the opposite side of the cantilever 510, such that the linear movement position of the cantilever 510 relative to the second member 420 of the first assembly 400 is relatively locked by the tab 510c selectively engaging the aperture 422 in different positions.

Portions 2a to 2e of fig. 2 schematically illustrate how the welding helmet 200 may be connected to the headband structure 600 and the hard hat 100, respectively, using a detachable connection according to the present application. Generally, the second assembly 500 of the detachable connection device according to the present application may always be connected to the welding helmet 200. As shown in part 2a of fig. 2, linear sections similar to the linear section 421 described above are also provided on the headband structure 600 to engage the runners 510b of the cantilever 510, respectively. In this way, the welding helmet 200 coupled to the second assembly 500 may be detachably coupled to the headband structure 600 using the runners 510b on the cantilever arms 510 of the second assembly 500 and may be linearly movable with respect to the headband structure 600 without the user needing to wear the crash helmet 100. Meanwhile, due to the presence of the second pivot axis O2 of the second assembly 500, the welding helmet 200 may also pivot relative to the second assembly 500 about the second pivot axis O2. Also because the second assembly 500 is non-pivotably engaged with respect to the headgear structure 600, the welding helmet 200 can pivot about a second pivot axis O2 with respect to the headgear structure 600. In case that the user wants to wear the helmet 100, the welding helmet 200 with the second assembly 500 is detached from the headband structure 600. A pair of first assemblies 400 are respectively mounted on the helmet 100, for example, via the above-described interaction of the snap features 411 with the openings 111, as shown in

portions

2b and 2c of fig. 2. The position of the first assembly 400 relative to the headgear 100 is such that the left and right two linear sections 421 of the pair of first assemblies 400 can just receive the slideways 510b of the pair of second assemblies 500 on the welding helmet 200, respectively, as shown in

parts

2d and 2e of fig. 2. In this way, after the welding helmet 200 is mounted to the hard hat 100 via the detachable connection of the present application, the first pivot axis O1 defined by the first component 400 and the second pivot axis O2 defined by the second component 500 of the detachable connection are parallel to each other, while the second pivot axis O2 is located forward of the first pivot axis O1. The second pivot axis O2 is linearly movable with respect to the first pivot axis O1 as viewed in a plane perpendicular to the two pivot axes O1 and O2.

With further reference to fig. 3a to 3c, it is illustrated how the welding helmet 200 is moved relative to the helmet 100 using the detachable connection arrangement of the present application. After the welding helmet 200 is connected to the hard hat 100 using the detachable connection of the present application, the first pivot axis O1 defined by the first component 400 and the second pivot axis O2 defined by the second component 500 are located below the linear section 421 of the second member 420 of the first component 400 in the use state where the welding helmet 200 is located in front of the hard hat 100. The welding helmet 200 may be moved back and forth linearly along the linear section 421 relative to the helmet 100 or the second member 420 of the second assembly 500 as indicated by the double arrow a and locked in place, as shown in fig. 3 a. Furthermore, the welding helmet 200 may pivot relative to the hard hat 100 or the second assembly 500 about a second pivot axis O2, as shown in fig. 3 b. Thus, by moving the welding helmet 200 linearly into position relative to the helmet 100, the welding helmet 200 may be pivoted about the second pivot axis O2 into position over the helmet 100. Furthermore, even further inversion of the welding helmet 200 onto and/or behind the helmet 100 may be continued by further pivoting the second member 420 of the first assembly 400 about the first member 410, as shown in fig. 3 c. Since the first pivot axis O1 is located rearwardly and downwardly of the second pivot axis O2 as viewed in side elevation, it is significantly more labor-saving during this flipping. Therefore, with the detachable connection device of the present application, the user does not need to repeatedly take off and put on the helmet 100 to observe the welding site during the welding process as in the prior art; in addition, the user can also turn the welding helmet 200 upward with less effort, thereby improving the wearing comfort of the helmet 100 to which the welding helmet 200 is attached.

Fig. 4 schematically shows a pair of second components 500 connected to the detachable connection means of the welding helmet 200 mainly inside the shell of the welding helmet 200. It can be seen that only the knob 520 of each second assembly 500 is located outside the shell of the welding helmet 200, with the remainder of each second assembly 500 being located inside the shell of the welding helmet 200. With further reference to fig. 5, each second assembly 500 includes a cantilever 510 and a pivotal connection structure consisting of a knob 520 and a threaded member 530 engaged with the knob 520. A receiving plate 510a is formed in an end of the cantilever 510 opposite to the end forming the slide 510b, and a center hole 511 is formed in the center of the receiving plate 510 a. The threaded member 530 includes a head 532 and a shank 531 extending perpendicularly from the head 532. The radial dimension of the head 532 is significantly greater than the dimension of the central bore 511. The outer surface of the stem 531 is of non-circular design in cross-section so as to be able to pass through a correspondingly non-circular designed aperture formed in the housing wall of the welding helmet 200. That is, turning the welding helmet 200 causes the threaded members 530 to rotate about their own central axes. Meanwhile, the shank 531 may be designed to be able to pass through the central hole 511 of the receiving plate 510a and to be able to rotatably engage with its outer surface on the inner surface of the central hole 511.

The knob 520 is formed with a threaded post 521, and a male screw is formed on the threaded post 521. An internally threaded hole is formed in the shank 531 so that the threaded post 521 of the knob 520 can be screwed into the internally threaded hole of the shank 531 after the shank 531 is passed through the center hole 511 of the receiving plate 510 a. Spacers may be provided between the knob 520, the receiving plate 510a of the cantilever 510, and the head 532 of the screw member 530, respectively, as desired. In use, the housing wall of the welding helmet 200 is positioned between the cantilever 510 and the knob 520. Meanwhile, since the threaded post 521 of the knob 520 passes through the housing wall of the welding helmet 200 and threads into the internally threaded bore of the handle 531, the housing wall of the welding helmet 200 can be sandwiched between the knob 520 and the cantilever 510. When assembled in place, the head 532 of the threaded member 530 may be located in the receiving pan 510a in the circular area defined by the circumferential flange 512 of the receiving pan 510 a.

In order to prevent uncontrolled and random pivoting of the welding helmet 200 relative to the second component 500 about the second pivot axis O2, a toggle button 540 is also provided on the pivotal connection of the second component 500. For example, the toggle 540 is disposed on the head 532 of the screw member 530 to be linearly slidable in a radial direction and exposed. As shown in fig. 6a and 6b, toggle 540 is generally L-shaped when viewed in cross-section. A protrusion 541 is formed on a side of the elongated body of the toggle 540 facing the head 532 of the screw member 530, and a bent portion 542 is formed at an end of the elongated body of the toggle 540 away from the center of the head 532. Also, a notch 513 is formed in the circumferential flange 512 of the receiving plate 510 a. The notch 513 is sized to receive the bend 542. Two through

holes

532a and 532b capable of receiving the protrusions 541, respectively, are provided in the radial direction near the center of the head 532. Thus, when the protrusion 541 is received in the through hole 532a due to the dial 540 sliding radially relative to the threaded member 530, the dial 540 is in its locked position relative to the threaded member 530; and when the protrusion 541 is received in the through hole 532b due to the dial 540 sliding radially relative to the screw member 530, the dial 540 is in its unlocked position relative to the screw member 530. When the threaded member 530 is mounted on the cantilever 510 such that the head 532 is within the circular area defined by the circumferential flange 512 of the receiving plate 510a, the bent portion 542 of the toggle 540 in the locked position can be snugly received in the notch 513. Thus, after the welding helmet 200 is mounted in place via the detachable connection of the present application, the toggle 540 in the locked position prevents the welding helmet 200 from pivoting about the second pivot axis O2 due to the blocking action of the bent portion 542 in the notch 513 because the cantilever 510 of the second assembly 500 is not rotatable. When the toggle 540 is pulled such that it is in the unlocked position (as shown in portions 4a and 6a in fig. 4), the bend 542 moves radially outward away from the notch 513, at which time the welding helmet 200 will be allowed to pivot about the second pivot axis O2 (as shown in portions 4b and 6b in fig. 4). The dial 540 is located inside the shell of the welding helmet 200. One example of a rotation locking means that can act on the pivot connection is illustrated with reference to fig. 4 to 6b, which rotation locking means is substantially constituted by a toggle 540 and an indentation 513 formed in the receiving disc 510 a.

Fig. 7 schematically shows a pair of second assemblies 500 connected to detachable connection means of the welding helmet 200 mainly inside the shell of the welding helmet 200, wherein each second assembly 500 is equipped with a rotational locking device according to another example of the present application. Each second assembly 500 includes a cantilever 510 'and a pivotal connection structure consisting of a knob 520 and a threaded member 530' (fig. 8) engaged with the knob 520. For the sake of brevity, only the differences between the second assembly 500 according to this example and the second assembly 500 described with reference to fig. 4 to 6b are described below, and reference may be made to the above description for the same. Cantilever 510 ' is formed in a manner similar to cantilever 510, but cantilever 510 ' includes a receiving sleeve 510a '. A radially open receiving receptacle 514 is formed in the receiving disk 510 a'. Meanwhile, as shown in fig. 8, a ratchet 550 may be sleeved on the handle of the threaded member 530 'such that the ratchet 550 cannot freely pivot relative to the threaded member 530' about the second pivot axis O2. This may be accomplished, for example, by providing a ring of internal teeth on the threaded member 530' to mesh with external teeth on the ratchet 550; this can also be achieved by forming the central hole of the ratchet 550 in a non-circular manner, while forming the shank of the screw member 530 'in a corresponding non-circular manner, and sleeving the ratchet 550 on the shank of the screw member 530' in this manner.

Similar to fig. 4, the shank of the screw-threaded member 530 ' is inserted into the central circular hole of the receiving pan 510a ' so that the threaded hole formed in the shank can be engaged with the externally threaded post of the knob 520 with the housing wall of the welding helmet 200 sandwiched between the receiving pan 510a ' and the knob 520. Thus, the second assembly 500 may be secured to the welding helmet 200 by a screw clamping action. A space for receiving the ratchet 550 is formed in the receiving plate 510 a', and the space communicates with the receiving receptacle 514. Disposed within receiving receptacle 514 is a pawl 560. For example, the pawl 560 can be pivotally mounted in the receiving receptacle 514. Meanwhile, a holder 561 is also disposed in the receiving receptacle 514, and a coil spring 562 is disposed between the holder 561 and the jaw 560 to apply an elastic force therebetween tending to separate the two from each other. The end of the holder 561 near the center of the receiving pan 510 a' is formed in a flat pointed manner so that the flat pointed end of the holder 561 can slidingly contact a segment of a circular arc surface of the receiving receptacle 514. Receiving receptacle 514 is configured such that pawl 560 cannot escape radially and is only partially exposed radially while a portion of pawl 560 passes through receiving receptacle 514 to engage ratchet wheel 550. By pressing a portion of the pawl 560 adapted to engage the ratchet wheel 550 and an opposite portion of the pawl 560 relative to the seat 561 from the radial outside, the pawl 560 can be in a position to engage the ratchet wheel 550 (as shown in fig. 9 a) or a position to disengage the ratchet wheel 550 (as shown in fig. 9 b), respectively, such that it can be restrained whether the welding helmet 200 can pivot relative to the second assembly 500 about the second pivot axis O2 defined by the pivotal connection. A further example of a rotation locking device that can act on the pivotal connection is illustrated according to fig. 7-9 b, which rotation locking device is substantially composed of a ratchet wheel 550 and a pawl 560.

Although two examples of rotational locking means are described above, it will be clear to a person skilled in the art that other forms of rotational locking means may be applied in the pivotal connection of the second assembly 500. Further, the above-described rotation locking means may be provided in only one second assembly 500 or in both second assemblies 500 of a pair of second assemblies 500.

Although specific embodiments of the present application have been described herein in detail, they have been presented for purposes of illustration only and are not to be construed as limiting the scope of the application. Further, it should be clear to those skilled in the art that the various embodiments described in this specification can be used in combination with each other. Various substitutions, alterations, and modifications may be conceived without departing from the spirit and scope of the present application.

Claims

1. A detachable connection for a mask comprising:

a pair of first members (400), said first members (400) being adapted to be connected to a first fitting secured to the head of a user; and

a pair of second components (500) respectively detachably connected to the pair of first components (400), the second components (500) being intended to be connected to a mask or to a second fitting fixed to the head of a user, the second fitting being different from the first fitting, characterized in that,

each of the first assemblies (400) includes a first member (410) and a second member (420) pivotally connected to each other, the first member (410) having a snap-fit structure (411) for removably connecting to the first fitting, the first member (410) being stationary after being removably connected to the first fitting, the second member (420) including a linear section (421);

the pair of first assemblies (400) defining a first pivot axis (O1) upon connection to the first fitting, the second member (420) being pivotable relative to the first member (410) about the first pivot axis (O1);

each of the second assemblies (500) having a structure engageable with the respective rectilinear segment (421) to slide rectilinearly along the rectilinear segment (421), the pair of second assemblies (500) defining a second pivot axis (O2) upon engagement with the rectilinear segment (421) of the respective second member (420), the facepiece being pivotable about the second pivot axis (O2), the second pivot axis (O2) being parallel to the first pivot axis (O1), and the second pivot axis (O2) being selectively rectilinearly movable parallel to the rectilinear segment (421) relative to the first pivot axis (O1), as viewed in a plane perpendicular to the first pivot axis (O1) and the second pivot axis (O2).

2. The detachable connection according to claim 1, characterized in that at least one of said pair of second assemblies (500) is provided with a rotational locking device to lock the position of said mask about said second pivot axis (O2).

3. The detachable connection device according to claim 1 or 2, characterized in that said pair of first components (400) is arranged in a mirror-symmetrical manner with respect to the vertical median plane of said first fitting and in that said pair of second components (500) is arranged in a mirror-symmetrical manner with respect to the vertical median plane of said mask and/or second fitting.

4. The detachable connection arrangement according to claim 2, characterized in that the first pivot axis (O1) is located behind and/or below the second pivot axis (O2) as seen in a plane perpendicular to the first pivot axis (O1) and the second pivot axis (O2) with the mask connected to the first fitting via the detachable connection arrangement when the mask is in front of the first fitting.

5. The detachable connection device according to claim 4, characterized in that each of said second assemblies (500) comprises a cantilever arm, at one end of which a slideway (510b) is formed to define a structure slidably engaged with said rectilinear section (421), at the other end of which, opposite to said slideway (510b), a pivoting connection structure is provided to define said second pivoting axis (O2).

6. The detachable connection device according to claim 5, wherein the pivotal connection structure comprises a knob (520) and a screw member engaged with the knob (520), the screw member comprising a head (532) and a shank (531) extending perpendicularly from the head (532), the shank (531) being provided with an internally threaded hole for screwing through the cantilever arm with an externally threaded post of the knob (520).

7. The detachable connection device of claim 6, wherein an outer contour of the handle (531) has a non-circular cross-section, and the handle (531) passes through an opening formed complementary to the non-circular cross-section in a housing wall of the mask that is sandwiched between the knob (520) and the cantilever arm, and only the knob (520) is exposed with respect to the mask.

8. The detachable connection device according to claim 7, wherein the rotation locking means comprises a notch (513) formed in the cantilever and a toggle knob (540) mounted radially movably in the head (532), the toggle knob (540) having a bent portion (542), the toggle knob (540) being movable between a locked position in which the bent portion (542) is engaged within the notch (513) to prevent pivoting of the mask relative to the cantilever and an unlocked position in which the bent portion (542) is disengaged from the notch (513) to allow pivoting of the mask relative to the cantilever.

9. The detachable connection device according to claim 7, characterized in that at least one of said pair of second assemblies (500) is provided with a rotation locking device comprising:

a ratchet (550) fitted over the shank (531) in a manner non-pivotable about the second pivot axis (O2) relative to the threaded member; and

a pawl (560) movably mounted in the cantilever arm, the pawl (560) movable between a locked position engaging the ratchet (550) to prevent pivoting of the visor relative to the cantilever arm and an unlocked position disengaged from the ratchet (550) to allow pivoting of the visor relative to the cantilever arm.

10. The detachable connection device according to claim 9, characterized in that a receiving receptacle (514) is formed in the cantilever to receive the pawl (560), and a seat (561) receiving a helical spring (562) is also received in the receiving receptacle (514), the helical spring (562) being located between the seat (561) and the pawl (560) to exert a resilient force tending to separate them from each other.

11. The detachable connection device according to claim 8, wherein the toggle button (540) is formed with a protrusion (541) on a side thereof facing the head (532), the head (532) having two through holes (532a, 532b) formed therein, one of the two through holes (532a, 532b) defining the locking position when receiving the protrusion (541) and the other defining the unlocking position when receiving the protrusion (541).

12. The detachable connection device of claim 1 or 2, wherein the first accessory is a safety helmet (100) and the second accessory is a headband structure (600).

13. The detachable connection arrangement according to claim 1, wherein, with the mask connected to the first fitting via the detachable connection arrangement, the mask, when in front of the first fitting, is behind and/or below the second pivot axis (O2) as seen in a plane perpendicular to the first pivot axis (O1) and the second pivot axis (O2).