CN211985906U - Automatic light-changing welding mask - Google Patents

Abstract

The application discloses automatic become light welding face guard (100), includes: a mask shell (10); an automatic light changing filter mounted on the mask shell (10); and a transparent protective sheet (30) detachably mounted on the mask case (10), the transparent protective sheet (30) covering the automatic darkening filter on the outside of the mask case (10), at least one elongated protrusion being provided on the inside of the transparent protective sheet (30), at least one elongated groove being formed in the mask case (10) so that the at least one elongated protrusion can protrude into the at least one elongated groove when the transparent protective sheet (30) is mounted on the mask case (10).

Description

Automatic light-changing welding mask

Technical Field

The present application relates to an autodarkening welding helmet equipped with a detachable protective sheet.

Background

At the welding site, the operator needs to wear a welding mask to avoid various harmful rays and splashes generated during arc striking from damaging the body, particularly the face, the neck and the like. For protection against harmful rays, automatic darkening welding masks, for example, are usually equipped with automatic darkening filters. An auto-darkening filter, a critical component of welding masks, includes a liquid crystal panel that is used to rapidly change from a transparent state to a non-transparent state at the moment of arc initiation to provide protection to the eyes of the operator.

In order to protect the liquid crystal panel of the auto-darkening filter from the impact of splashes generated during welding, a transparent protective sheet is generally provided in front of the liquid crystal panel. However, such protective sheets wear out after a long period of use due to constant contact with spatter, and the operator cannot see clearly the workpieces to be welded. Therefore, it is desirable to provide a welding helmet with protective sheets that can be easily replaced at any time.

In addition, in order to prevent spatter generated during welding from entering the inside of the welding helmet and affecting the normal operation of the automatic darkening filter, it is also necessary to consider how to ensure the sealing property of the protection sheet mounted on the welding helmet.

Disclosure of Invention

In view of the above problems, the present application is directed to an improved auto-darkening welding helmet equipped with a transparent protective sheet that can be conveniently detached, and which can protect the auto-darkening filter from welding spatter.

According to one aspect of the present application, there is provided an automatic darkening welding mask comprising:

a mask shell;

an automatic light-changing filter mounted on the mask shell; and

a transparent protective sheet detachably mounted on the mask case, the transparent protective sheet being provided with a hooking portion and a locking portion, the hooking portion and the locking portion cooperating with the mask case so that the transparent protective sheet covers the automatic light changing filter on an outer side of the mask case, at least one elongated recess being formed in the mask case adjacent to the automatic light changing filter to receive at least one elongated protrusion provided on an inner side of the transparent protective sheet when the transparent protective sheet is mounted on the mask case. Thus, not only can the protective sheet be detachably mounted on the mask shell to ensure replacement at any time when needed, but also the design of the projection and the groove ensures that welding spatters cannot enter a possible gap between the mask shell and the protective sheet.

Optionally, a first aperture and a second aperture are formed in the mask shell into which the hook portion and locking portion are inserted, and a lock receiving structure is provided on the inside of the mask shell in alignment with the second aperture to lock the locking portion in place after the locking portion has partially passed through the second aperture.

Optionally, the lock receiving structure comprises:

an inner frame fixed relative to an inner side of the mask shell;

a base secured within said inner frame, said base and said inner frame together defining an interior cavity; and

a button slidably mounted in the inner cavity to lock or unlock the locking portion with respect to the inner frame,

an interior cavity is also defined in the button, the cavity defined by the button communicating with the second aperture, the locking portion being accessible through the second aperture.

Optionally, the direction of the locking portion into and out of the cavity defined by the button is at a non-zero angle to the sliding direction of the button.

Optionally, a direction in which the locking portion enters and exits the cavity defined by the button is ninety degrees to a sliding direction of the button.

Optionally, a first spring is arranged in an inner pocket defined by the base and the inner frame to apply a first force to the button tending to move it away from the inner pocket, a second spring is arranged in the inner pocket to apply a second force to move it away from a locking portion entering the pocket defined by the button, the button further being formed with a catch to lock the locking portion relative to the inner frame.

Alternatively, the hooking part is two, the locking part is also two, the first apertures are the same in number as the hooking part, and the second apertures are the same in number as the locking part.

Optionally, the at least one elongated projection is disposed as close as possible to an edge of the transparent protective sheet.

Optionally, the at least one elongated projection is two spaced apart elongated projections and the at least one elongated recess is also two elongated recesses to receive the two spaced apart elongated projections, respectively.

Alternatively, the locking portion includes a free end portion contactable with the second spring, and a protrusion extending in a direction opposite to the first force is formed on the free end portion, and a catch groove for engaging the protrusion is formed in the button.

By adopting the technical means, the transparent protection sheet can be conveniently detached and replaced at any time, meanwhile, the sealing performance between the protection sheet and the mask shell is also ensured, and the damage of the automatic light-changing filter due to the impact of splashes is avoided.

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 illustrates an autodarkening welding helmet according to one embodiment of the present application, wherein the helmet shell is separated from the protective sheet;

FIG. 2a shows a schematic view of an auto-darkening welding mask, viewed from the inside, in which the protective sheet has been in a locked state;

FIG. 2b shows an enlarged partial cross-sectional view taken in the direction of arrows A-A in FIG. 2 a;

fig. 3a shows a schematic view of a welding helmet from the inside, wherein the protective sheet has been in an unlocked state;

FIG. 3b shows an enlarged partial cross-sectional view taken in the direction of arrows A-A in FIG. 3 a;

fig. 4 shows a perspective view of a protective sheet according to one embodiment of the present application; and

FIG. 5 illustrates a partial perspective view of a mask shell according to one embodiment of the present application.

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 illustrates an auto-darkening welding mask 100, according to one embodiment of the present application. The welding helmet 100 includes a helmet shell 10. An automatic light changing filter is provided in the mask case 10. The automatic darkening filter includes a frame 20 and a liquid crystal panel 11 fixed in the frame 20. An automatic light changing filter is secured in an opening of the mask shell 10 via a frame 20. The frame 20 is fixed to the mask shell 10 around the opening.

The liquid crystal panel 11 of the automatic darkening filter is configured to transition from a transparent state to a non-transparent state at the moment of welding arcing, thereby protecting the wearer's eyes from harmful light.

For example, the automatic darkening filter may be secured to the mask shell 10 by suitable means such as screws or adhesive or a securing bracket. Since during field welding, there are various splashes that impact the mask shell 10 in addition to harmful radiation generation. Also, since the wearer wearing the welding mask 100 needs to align the automatic darkening filter with the welding site in order to observe the welding situation, spatter will inevitably impact the automatic darkening filter. Therefore, in order to protect the liquid crystal panel of the auto-darkening filter from damage, a transparent protective sheet is disposed in front of the auto-darkening filter.

Typically, such a transparent protective sheet would be secured to the mask shell 10. Thus, after a period of use, the transparent protective sheet may be left unclean, i.e. blurred, by the impact of the spatter, thus affecting the welding operation performed by the wearer. In addition, improper placement of the welding helmet by a worker, such as landing on its protective sheet, at the welding site can also exacerbate the degree of wear of the transparent protective sheet, which can affect viewing.

Therefore, the automatic darkening welding helmet 100 according to the present application is also equipped with a transparent protective sheet 30 that can be easily detached. As shown in fig. 1, the transparent protective sheet 30 can be detachably mounted to the mask case 10 so as to cover the automatic darkening filter from the outside to provide protection thereto. The transparent protective sheet 30 may be made of any suitable transparent material, for example. As an example, the transparent protective sheet 30 may be integrally formed of a transparent material resistant to high-strength impact, such as polycarbonate, polyurethane, resin, or the like.

As further shown in fig. 4, the protective sheet 30 has an outer side and an inner side, while fig. 4 shows the inner side of the protective sheet 30. In the context of the present application, reference to the outside of the protective sheet refers to the side that faces outward (i.e., toward the workpiece to be welded) when the protective sheet 30 is mounted on the mask housing 10, and reference to the inside of the protective sheet refers to the side that faces inward (i.e., toward the wearer or the automatic darkening filter) of the mask housing 10 when the protective sheet 30 is mounted on the mask housing 10. The protective sheet 30 is of a curved design, and two hooking portions 31 separated from each other are integrally formed on the inner side of the protective sheet 30. For example, each hook portion 31 extends from the inner side of the protective sheet 30 substantially perpendicularly or at an angle (other than 90 degrees) near one edge away from the inner side first, and then extends substantially parallel to the inner side to project outward from the edge.

In the vicinity of the other edge opposite to the edge where the hooking portion 31 is formed, two locking portions 32 are integrally formed on the inner side of the protective sheet 30. Each locking portion 32 projects away from the inner side of the protective plate 30. In an alternative embodiment, the locking portion 32 may also be formed separately and then adhered on the inner side of the protective sheet 30. The hook part 31 and the locking part 32 are configured to be capable of cooperating with the mask case 10.

Two spaced apart apertures 12 are formed in the mask shell 10, the locking portion 32 being configured to be able to pass at least partially through the apertures 12. For example, the aperture 12 is in the form of an elongate slot and is adjacent one edge of the frame 20. Near the opposite other side of the frame 20, two spaced apart apertures 13 are formed in the mask shell 10, the hook portion 31 being configured to be able to pass at least partially through the apertures 13. That is, in the assembled welding helmet, the orifice 12 and the orifice 13 are spaced apart from each other via an auto darkening filter.

It will be apparent to those skilled in the art that the number of the hooking part 31 or the locking part 32 may be one or more; and the number of the apertures 12 or 13 may be one or more as long as the number of the hooking portions 31 or the locking portions 32 is the same as the number of the apertures 12 or 13, respectively.

Turning now to fig. 2a to 3b, the mask shell 10 is provided with a lock receiving formation 14 at a location corresponding to each of the two apertures 12, as viewed from the inside. In the context of the present application, reference to the inside of the mask shell 10 refers to the side that faces the head of the person when the welding mask is worn by the wearer, and similarly reference to the outside of the mask shell 10 refers to the side that faces the surroundings when the welding mask is worn by the wearer. For example, the lock receiving structure 14 is provided on the inside of the mask shell 10. Each lock receiving structure 14 includes an inner frame 141 integrally formed on the inner side of the mask shell 10, the inner frame 141 defining an opening 141a communicating with the corresponding orifice 12, and a base 142 fixed in the inner frame 141. For example, the susceptor 142 may be inserted into the inner frame 141 from one side opening of the inner frame 141, thereby defining a receptacle 140 with the inner frame 141. For example, the base 142 can be fixed in the inner frame 141 by a form fit or a force fit. A button 143 is installed in the housing 140 to be linearly slidable. The button 143 is configured to be able to protrude at least partially through the opening 141b of the inner frame 141. The button 143 also defines an interior receptacle that communicates with both the receptacle 140 and the opening 141 a. A spring 144, such as a coil spring, is disposed between the base 142 and the inner frame 141 opposite the opening 141b of the inner frame 141. The spring 144 is used to apply a force to the button 143 tending to cause it to at least partially protrude from the opening 141 b. A further spring 145, for example a helical spring, is also arranged in the inner frame 141. The central axes of the two springs 144 and 145 may be perpendicular to each other. One end of the spring 145 is fixedly interposed between the inner frame 141 and the base 142, and the other end protrudes into the inner cavity of the button 143. Said spring 145 is arranged so as not to affect in any way the sliding of the button 143 in the housing 140.

When assembled in place, the locking portion 32 of the protective sheet 30 can extend at least partially through the aperture 12 into the interior volume of the button 143, as shown in fig. 2 b. The spring 145 may be configured to contact the lock 32 upon entry of the lock 32 into the interior volume of the button 143 or upon a distance to apply a force to the lock 32 tending to cause it to move away from the interior volume of the button 143. For example, the force of spring 144 and the force of spring 145 may be directed substantially perpendicular. A protrusion 321 is formed transversely in the end of the locking portion 32 that projects into the interior receptacle of the button 143. For example, the protrusion 321 may extend in a direction in which the button 143 may be pressed by a finger. For example, the protrusion 321 is adjacent to the contact point of the spring 145 on the lock 32.

The protrusion 321 is formed with a slope 321 a. A slope 143a is also formed in the button 143. A catching groove 143b is further formed in the button 143 adjacent to the inclined surface 143a, and the catching groove 143b is disposed to communicate with an inner cavity of the button 143. Furthermore, the button 143 is arranged in the cavity 140 such that when the locking portion 32 is not inserted, a ramp 143a is at least partially exposed via an opening 141a, wherein the opening 141a is aligned with the aperture 12 such that the locking portion 32, when inserted into the aperture 12 and through the opening 141a, first comes into contact with the ramp 143 a.

As the locking part 32 protrudes through the aperture 12 of the mask housing 10 into the interior cavity of the button 143, the inclined surface 321a of the locking part 32 first comes into contact with the inclined surface 143a of the button 143. As the lock 32 continues deeper into the interior cavity of the button 143, the protrusion 321 of the lock 32 pushes the button 143 against the button 143 via the inclined surface 143a of the button 143 to move in a direction against the force of the spring 144. Meanwhile, in this process, the lock portion 32 also comes into contact with the spring 145 and receives the resistance force exerted by the spring 145. After the protrusion 321 passes over the inclined surface 143a of the button 143, the button 143 moves reversely by the force of the spring 144 and finally the protrusion 321 is snapped into the catching groove 143b of the button 143. Thus, under the force of the two springs 144 and 145 and the catch 143b of the button 143, the locking portion 32 remains stationary in the lock receiving structure 14 while at least a portion of the button 143 is exposed through the opening 141b of the inner frame 141.

When release is desired, as shown in fig. 3, the exposed button 143 is pressed by a finger in the direction of arrow a1, causing the button 143 to move within the cavity 140 against the force of the spring 144, such that the catch 143b disengages from the protrusion 321 of the lock 32. Lock 32 is then forced by spring 145 to exit the interior cavity of button 143 in the direction of arrow a2 and can pass through aperture 12 of mask shell 10 to disengage from mask shell 10.

In mounting the transparent protective sheet 30, first, as indicated by arrows B1 and B2, the two hook portions 31 are inserted into the two apertures 13, respectively. Then, the protective sheet 30 is pivoted toward the mask case 10 with the contact portion of the hooking portion 31 inserted into the orifice 13 as a pivot axis, so that the two locking portions 32 are inserted into the two orifices 12, respectively. At the same time, in entering the aperture 12, the locking portion 32 is locked in place in the corresponding lock receiving structure 14 as described above.

As shown in fig. 2a, the pressing directions of the two buttons 143 may be set opposite to each other for easy manual operation. In an alternative embodiment, the pressing directions of the two buttons 143 may be set to be the same as each other. Furthermore, the locking portion 32 is flat and preferably has a thickness that fits into the aperture 12, which is in the form of an elongated slot, so that it is ensured that spatter is prevented from passing along the aperture 12 into the interior space of the mask shell 10, which is defined by the inside.

In addition, as shown in fig. 5, an elongated recess 120 is formed in the mask shell 10. A corresponding projection 33 is integrally formed on the inner side of the protective sheet 30, said projection 33 being shaped complementary to the recess 120 to fit into the recess 120. In addition, an elongated recess 130 is formed in the mask shell 10, the recess 130 being opposite the recess 120. Accordingly, a corresponding projection 34 is integrally formed on the inner side of the protective sheet 30. Preferably, the recesses 120 and 130 are disposed about the frame 20 of an automatic light changing filter, such as an automatic light changing filter, for example, as shown in FIG. 5, adjacent upper and lower edges, respectively, of the frame 20. The projection 34 is shaped complementary to the recess 130 to fit into the recess 130. In this way, when the protective sheet 30 is mounted in place on the mask shell 10, the protrusions 33 and 34 are inserted into the recesses 120 and 130, respectively, thereby ensuring the sealing between the protective sheet 30 and the mask shell 10 and further preventing splashes from contacting the automatic darkening filter through the gap between the protective sheet 30 and the mask shell 10. After the welding helmet 100 is worn by a wearer, the pair of grooves 120 and projections 33 and the pair of grooves 130 and projections 34 are positioned generally near a location above and below the wearer's eyes. In order to ensure the sealing performance, the projection 33 or 34 is formed as close as possible to the edge of the protective sheet 30. In an alternative embodiment, a sealing material, such as a soft gel strip, may be applied to the protrusions 33, 34 and/or in the recesses 120, 130.

Furthermore, in an alternative or additional embodiment, the above-mentioned recesses may also be provided in the mask housing 10 in the vicinity of the left and right sides of the frame 20 of the automatic light-changing filter, for example, the automatic light-changing filter, and correspondingly, the protrusions are provided in the vicinity of the left and right sides of the inner side of the protective sheet 30, respectively.

According to the embodiment of the present application, the outer side of the transparent protective sheet 30 is shaped to form a smooth surface with the outer side of the mask case 10 just after the transparent protective sheet 30 is mounted in place, thereby providing a surface without any step as viewed from the outside. This smooth outer surface design may ensure that the weld spatter is more perfectly reflected upon contact with the surface to protect the wearer.

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 (10)

1. An automatic darkening welding mask (100), comprising:

a mask shell (10);

an automatic light changing filter mounted on the mask shell (10); and

a transparent protective sheet (30) detachably mounted on the mask case (10), the transparent protective sheet (30) being provided with a hooking portion (31) and a locking portion (32), the hooking portion (31) and the locking portion (32) cooperating with the mask case (10) so that the transparent protective sheet (30) covers the auto darkening filter on the outside of the mask case (10), at least one elongated recess being formed in the mask case (10) adjacent to the auto darkening filter to receive at least one elongated protrusion provided on the inside of the transparent protective sheet (30) when the transparent protective sheet (30) is mounted on the mask case.

2. An auto-darkening welding mask (100) according to claim 1, wherein a first aperture (13) and a second aperture (12) into which the hooking part (31) and the locking part (32) are inserted are formed in the mask shell (10), and a lock receiving structure (14) aligned with the second aperture (12) is provided on the inner side of the mask shell (10) to lock the locking part (32) in place after the locking part (32) has partially passed through the second aperture (12).

3. An automatic darkening welding mask (100) as claimed in claim 2, wherein the locking receiving structure (14) comprises:

an inner frame (141) fixed relative to the inside of the mask shell (10);

a base (142) secured within the inner frame (141), the base and inner frame together defining an interior receptacle (140); and

a button (143) slidably mounted in the inner pocket (140) to lock or unlock the locking portion (32) with respect to the inner frame (141),

an internal cavity is also defined in the button (143), the cavity defined by the button (143) is in communication with the second aperture (12), and the locking portion (32) is accessible to the cavity defined by the button (143) after passing through the second aperture (12).

4. An auto-darkening welding mask (100) as claimed in claim 3, wherein the direction of the locking portion (32) into and out of the cavity defined by the button (143) is at a non-zero angle to the sliding direction of the button (143).

5. An automatic light changing welding mask (100) according to claim 3, wherein the direction of the locking portion (32) entering and exiting the cavity defined by the button (143) is ninety degrees to the sliding direction of the button (143).

6. Auto-darkening welding helmet (100) according to claim 4 or 5, characterized in that in the inner volume (140) defined together by the base (142) and the inner frame (141) a first spring (144) is arranged to apply a first force to the button (143) tending to move it away from the inner volume (140), in that in the inner volume (140) a second spring (145) is arranged to apply a second force to the locking portion (32) entering the volume defined by the button (143) moving it away, in that the button (143) is further formed with a catch groove (143b) to lock the locking portion (32) with respect to the inner frame (141).

7. An auto-darkening welding mask (100) according to claim 6, wherein the number of hooking parts (31) is two, the number of locking parts (32) is also two, the number of first apertures (13) is the same as the number of hooking parts (31), and the number of second apertures (12) is the same as the number of locking parts (32).

8. An automated light darkening welding mask (100) as claimed in claim 7, wherein said at least one elongated protrusion is provided as close as possible to the edge of the transparent protective sheet (30).

9. An automatic darkening welding mask (100) as defined in claim 8,

the at least one elongated projection is two spaced apart elongated projections and the at least one elongated recess is two elongated recesses for receiving the two spaced apart elongated projections, respectively.

10. An auto-darkening welding mask (100) as claimed in claim 9, characterized in that the locking portion (32) comprises a free end portion which can be contacted with the second spring (145), and a protrusion (321) extending opposite to the direction of the first force is formed on the free end portion, and a catching groove (143b) for engaging the protrusion (321) is formed in the button (143).

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