Easily-washed breathable down jacket

By setting up a channel and an upper opening between the surface layer and the inner liner of the down jacket, the down jacket has poor breathability and burst problems, and the rapid drainage and thermal insulation are achieved, and the user experience in different environments is improved.

CN222194211UActive Publication Date: 2024-12-20BEIJING SKYMAN CLOTHING CO LTD
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Patent Information

Application Number
CN202420974343.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-07
Publication Date
2024-12-20
Estimated Expiration
2034-05-07

AI Technical Summary

Technical Problem

The poor breathability of down jackets leads to prone to burst during cleaning and cannot quickly dissipate heat during intense activities or high-temperature environments.

Method used

The channel is arranged between the surface layer and the inner liner of the down jacket, and the passage includes an upper opening and a lower opening through which water and air can be quickly discharged, improving breathability and drainage speed, while a velvet filling layer is arranged at the upper opening position to maintain Insulation performance.

Benefits of technology

It effectively avoids the problem of bursting down jackets during machine washing, and improves the user experience in different temperature environments, achieving both breathability and thermal insulation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a breathable down jacket easy to wash. The breathable down jacket comprises a surface layer, an inner container and channels. The surface layer is arranged on the outer side far away from a human body; the inner container is arranged on the inner side close to a human body, and a down filling layer is arranged in the inner container; the channel is arranged between the surface layer and the inner container; the channel comprises an upper opening and a lower opening, and the upper opening is formed in the surface layer at the upper part of the back piece of the down jacket body; the lower opening is configured to be located at the bottom of the down jacket. According to the down jacket, the channel communicated with the outside is formed between the surface layer and the inner container of the down jacket, the breathability and the drainage speed of the down jacket are improved, the phenomenon that the down jacket bursts during machine washing is avoided, a user can wear the down jacket to do violent activities, the down jacket can be suitable for more temperature environments, and the use experience of the user is improved.
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Description

Technical Field

[0001] The present invention relates to the technical field of clothing, and in particular to an easily washable and breathable down jacket. Background Art

[0002] Down jackets usually have a waterproof coating on their surface and poor air permeability. When washing, down jackets tend to float on the water. After being completely soaked, there are still large gaps inside the down jacket, and the water that has penetrated into the down jacket cannot be quickly drained out. When washing with a washing machine, the down jacket will swell after absorbing enough water, and air will be generated inside the down jacket. Since the water and air inside the down jacket are difficult to drain quickly, the down jacket may burst.

[0003] In addition, due to the poor air permeability of down jackets, when the user is engaged in strenuous activities or the ambient temperature rises, the human body cannot dissipate heat quickly and sweat cannot be discharged quickly. In the prior art, the air permeability of down jackets can be improved by setting air permeable chains, but no filler is set at the location of the air permeable chains, thereby reducing the warmth retention performance of the down jackets. Moreover, the solution of setting air permeable chains cannot solve the problem of down jackets bursting when machine washed. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the present invention provides an easily washable and breathable down jacket.

[0005] According to a first aspect of the present disclosure, there is provided an easily washable breathable down jacket, comprising:

[0006] A surface layer, the surface layer being arranged on an outer side away from a human body;

[0007] An inner liner, the inner liner is arranged on the inner side close to the human body, and a filling layer is arranged in the inner liner;

[0008] A channel is arranged between the surface layer and the liner; the channel comprises an upper opening and a lower opening, the upper opening is arranged on the surface layer at the upper part of the back piece of the down jacket; the lower opening is constructed to be located at the bottom of the down jacket.

[0009] In one embodiment of the present disclosure, a first mesh is further included, wherein the first mesh is configured to cover the upper opening.

[0010] In one embodiment of the present disclosure, a covering layer is further included, wherein the covering layer is configured to be disposed on the outside of the first mesh cloth and to cover the first mesh cloth; and at least one side of the covering layer is configured to be provided with a vent.

[0011] In one embodiment of the present disclosure, it further includes a second mesh cloth, which is configured to cover the lower opening; the surface layer and the liner located at the bottom of the down jacket are configured to be spliced ​​together by the second mesh cloth.

[0012] In one embodiment of the present disclosure, the surface layer is constructed to extend downward to form an extension portion; the bottom of the down jacket is provided with a hem, which is constructed to be arranged on the inner side of the extension portion and is constructed to be connected to the liner through the second mesh cloth.

[0013] In one embodiment of the present disclosure, a drawstring is provided in the hem, and the drawstring is configured to be used for adjusting the size of the hem.

[0014] In one embodiment of the present disclosure, the lower opening is configured to be continuously arranged at a bottom position of the back piece of the down jacket.

[0015] In one embodiment of the present disclosure, a plurality of the lower openings are provided, and the plurality of the lower openings are configured to be arranged at intervals at the bottom of the down jacket.

[0016] In one embodiment of the present disclosure, at a junction between two adjacent lower openings, the liner is configured to be fixedly sewn to the surface layer.

[0017] In one embodiment of the present disclosure, the liner also includes an inner layer and a middle layer, the inner layer is arranged on the inner side close to the human body, the middle layer is arranged on the inner side of the surface layer, and is constructed to be enclosed with the inner layer to form the filling layer; a plurality of quilting lines are sewn on the inner side of the down jacket, and the plurality of quilting lines are configured to sew the inner layer and the middle layer to separate the filling layer into a plurality of filling cavities.

[0018] One beneficial effect of the present invention is that, by providing a channel connected to the outside world between the surface layer and the inner liner of the down jacket, the air permeability and drainage speed of the down jacket are improved. When washing the down jacket, water and air can enter the channel between the surface layer and the inner liner, and are quickly discharged from the upper opening or the lower opening, so that too much air and water will not accumulate inside the down jacket, thereby avoiding the down jacket from bursting during machine washing. In addition, the down jacket of the present invention is provided with an upper opening corresponding to the position of the back of the human body, so that sweat can be quickly discharged, and the human body can quickly dissipate heat. The user can wear the down jacket of the present invention for strenuous activities, and it can be applied to more temperature environments, thereby improving the user's experience. Compared with the solution of providing a breathable chain in the prior art, the inner side of the upper opening and the lower opening provided in the present invention are provided with an inner liner with a filling layer, thereby achieving both breathability and thermal insulation of the down jacket.

[0019] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0021] Figure 1 is a schematic diagram of the back of the down jacket disclosed herein;

[0022] Figure 2 is a structural exploded view of the opening position on the down jacket disclosed in the present invention;

[0023] Figure 3 is a schematic diagram of the interior of the down jacket disclosed herein;

[0024] Figure 4 It is a cross-sectional schematic diagram of the down jacket disclosed in the present invention.

[0025] Figures 1 to 4 The one-to-one correspondence between the component names and the reference numerals is as follows:

[0026] 101. Surface layer; 102. Inner lining; 1021. Filling layer; 1022. Inner layer; 1023. Middle layer; 11. Back piece; 12. Side piece; 13. Front piece; 14. Quilting; 2. Channel; 21. Upper opening; 211. First mesh; 212. Covering layer; 213. Ventilation hole; 22. Lower opening; 221. Second mesh; 3. Hem; 30. Filling layer; 31. Drawstring buckle. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0030] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0031] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0032] In this article, "first", "second", etc. are only used to distinguish each other, and do not indicate the importance and order, or the premise of each other's existence.

[0033] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0034] The present disclosure provides a washable and breathable down jacket, comprising: a surface layer, an inner liner and a channel. The surface layer is arranged on the outer side away from the human body, and the surface layer is the outermost fabric of the down jacket, and can be made of a windproof and waterproof material. The inner liner is arranged on the inner side close to the human body, and a filling layer is arranged in the inner liner, and the filling layer can be filled with duck down or goose down, so as to achieve a better thermal insulation effect.

[0035] The channel is arranged between the surface layer and the liner, and the channel includes an upper opening and a lower opening. The upper opening is arranged on the surface layer at the upper position of the back piece of the down jacket, and the lower opening is configured to be located at the bottom of the down jacket. The surface layer and the liner are configured to be separately arranged to form a channel between the two. The upper opening of the channel is located at a position corresponding to the upper part of the back of the human body, and is opened on the surface layer. The sweat and hot air on the back of the user can be discharged through the upper opening, thereby improving the wearing experience of the user. The lower opening of the channel is located at the bottom of the down jacket. During the washing process of the down jacket, external water and air can enter the channel from the upper opening and the lower opening, and the water and air in the channel can be discharged from the upper opening and the lower opening.

[0036] In the prior art, there is a solution of setting a single opening on a down jacket, which can also play a certain role in ventilation and water permeability. During the washing process, water can flow out from the single opening. However, the single opening may cause water to accumulate on the side of the down jacket that is not opened, and under the action of air pressure, the discharge speed of this water is relatively slow. The upper opening and lower opening that are interconnected in the present invention balance the air pressure of the channel with that of the outside world, so that air can circulate, and water that enters the channel during the washing process can be discharged more quickly, thereby preventing water from accumulating inside the down jacket and avoiding the down jacket from bursting during machine washing.

[0037] The present invention improves the air permeability and drainage speed of the down jacket by setting a channel connected to the outside world between the surface layer and the inner liner of the down jacket. When washing the down jacket, water and air can enter the channel between the surface layer and the inner liner, and quickly drain out from the upper opening or the lower opening. Too much air and water will not accumulate inside the down jacket, thereby avoiding the down jacket from bursting during machine washing. In addition, the down jacket of the present invention is provided with an upper opening corresponding to the position of the back of the human body, so that sweat can be quickly discharged, the human body can quickly dissipate heat, the user can wear the down jacket of the present invention for strenuous activities, and it can be applied to more temperature environments, thereby improving the user's experience. Compared with the solution of setting a breathable chain in the prior art, the inner side of the upper opening and the lower opening provided in the present invention are both provided with an inner liner with a filling layer, thereby achieving both breathability and thermal insulation of the down jacket.

[0038] The specific embodiments of the present disclosure are described below in conjunction with the accompanying drawings.

[0039] refer to Figures 1 to 4 The present disclosure provides a washable and breathable down jacket, comprising: a surface layer 101, an inner liner 102 and a channel 2. Figure 3 As shown, the body of the down jacket is mainly composed of a large back piece 11, a side piece 12 and a large front piece 13. Sleeves can be provided on both sides of the body, a cap can be provided on the upper end of the body, and pockets can be provided on the inner and outer sides of the body. The down jacket can also be provided with other basic structures known to those skilled in the art, which are not limited in the present disclosure.

[0040] like Figure 4 As shown, the surface layer 101 is arranged on the outer side away from the human body, and the surface layer 101 is the outermost fabric of the down jacket, and can be made of windproof and waterproof materials. The liner 102 is arranged on the inner side close to the human body, and a filling layer 1021 is arranged in the liner 102, and the filling layer 1021 can be filled with duck down or goose down, so as to achieve a better thermal insulation effect.

[0041] In one embodiment of the present disclosure, Figure 4 As shown, the liner also includes an inner layer 1022 and an intermediate layer 1023. The inner layer 1022 is arranged on the inner side close to the human body, and the intermediate layer 1023 is arranged on the inner side of the surface layer 101, and is constructed to be enclosed with the inner layer 1022 to form a filling layer 1021. Specifically, the inner layer 1022 is the innermost layer of fabric close to the human body, and can usually be made of a relatively soft and comfortable material. Figure 3 and Figure 4The inner side of the down jacket is sewn with a plurality of quilting lines 14, which are configured to sew the inner layer 1022 and the middle layer 1023 to separate the filling layer 1021 into a plurality of filling cavities. The filling cavities allow the duck down or goose down to be evenly distributed in the filling layer 1021 without accumulation and agglomeration, thereby ensuring that the filling amount at each position of the down jacket body 1 is basically the same, the thermal insulation effect of the whole down jacket is uniform, and the wearing experience of the user is improved.

[0042] like Figure 4 As shown, the channel 2 is arranged between the surface layer 101 and the inner liner 102, specifically, between the surface layer 101 and the middle layer 1023. Figures 1 to 3 The channel includes an upper opening 21 and a lower opening 22. The upper opening 21 is arranged on the surface layer 101 at the upper part of the back piece 11 of the down jacket, and the lower opening 22 is configured to be located at the bottom of the down jacket. The surface layer 101 and the liner 102 are configured to be separated to form a channel 2 between the two. Figure 1 As shown, the upper opening 21 of the channel 2 is located at a position corresponding to the upper back of the human body and is opened on the surface layer 101. The sweat and heat on the back of the user can be discharged through the upper opening 21, which improves the wearing experience of the user. The upper opening 21 can be set to a rectangular shape, or to a circular shape, a polygonal shape, or other shapes, which is not limited in the present disclosure.

[0043] like Figure 3 As shown, the lower opening 22 of the channel 2 is located at the bottom of the down jacket. During the washing process of the down jacket, external water and air can enter the channel 2 from the upper opening 21 and the lower opening 22, and the water and air in the channel 2 can be discharged from the upper opening 21 and the lower opening 22.

[0044] In the prior art, there is a solution of setting a single opening on a down jacket, which can also play a certain role in ventilation and water permeability. During the washing process, water can flow out from the single opening. However, the single opening may cause water to accumulate on the side of the down jacket that is not opened, and under the action of air pressure, the discharge speed of this water is relatively slow. The upper opening 21 and the lower opening 22 that are interconnected in the present invention make the air pressure of the channel balanced with that of the outside world, so that air can circulate, and the water that enters the channel during the washing process can be discharged more quickly, thereby preventing water from accumulating inside the down jacket and avoiding the down jacket from bursting during machine washing.

[0045] The present invention improves the air permeability and drainage speed of the down jacket by setting a channel 2 connected to the outside world between the surface layer 101 and the liner 102 of the down jacket. When washing the down jacket, water and air can enter the channel 2 between the surface layer 101 and the liner 102, and quickly discharge from the upper opening 21 or the lower opening 22, and the down jacket will not accumulate too much air and water, thereby avoiding the down jacket from bursting when machine washing. In addition, the down jacket of the present invention is provided with an upper opening 21 corresponding to the back position of the human body, so that sweat can be quickly discharged, the human body can quickly dissipate heat, the user can wear the down jacket of the present invention for intense activities, and it can be applied to more temperature environments, thereby improving the user's experience. Compared with the solution of setting a breathable chain in the prior art, the inner side of the upper opening 21 and the lower opening 22 provided in the present invention is provided with an inner liner 102 with a filling layer 1021, thereby achieving both ventilation and thermal insulation of the down jacket.

[0046] In one embodiment of the present disclosure, reference Figure 1 and Figure 2 The down jacket of the present disclosure further includes a first mesh 211, which is configured to cover the upper opening 21. The first mesh 211 has a shape substantially consistent with the upper opening 21, and its area is at least sufficient to cover the upper opening 21. The first mesh 211 may be provided with mesh holes with a very small diameter, and specifically, the diameter of the mesh holes may be about 0.1-0.3 cm. This can prevent things other than water and air from entering the channel from the upper opening 21. At the same time, the first mesh 211 prevents the middle layer 1023 from being directly exposed to the outside, thereby avoiding excessive wear of the position of the middle layer 1023 corresponding to the upper opening 21.

[0047] In one embodiment of the present disclosure, continue to refer to Figure 1 and Figure 2 The down jacket of the present disclosure also includes a covering layer 212, which is configured to be arranged on the outside of the first mesh 211 and to cover the first mesh 211; at least one side of the covering layer 212 is configured to be provided with a vent 213. The covering layer 212 has a shape substantially consistent with the first mesh 211 and the upper opening 21, and its area is at least sufficient to cover the first mesh 211. The covering layer 212 can be made of the same material as the surface layer 101, that is, it can be made of a windproof and waterproof fabric. The covering layer 212 covers the first mesh 211, thereby playing a role of windproof and heat preservation.

[0048] Specifically, in order to achieve the purpose of rapid drainage, the upper opening 21 has a relatively large opening area. If the covering layer 212 is not provided to block it, the user may get a cold back and feel cold. The covering layer 212 provided on the outer side of the first mesh 211 can play the same windproof and heat-insulating role as the surface layer 101, and because at least one side of the covering layer 212 is configured to be provided with a vent 213, the water-permeable and air-permeable function of the upper opening 21 will not be affected.

[0049] In a specific embodiment of the present disclosure, Figure 1 As shown, the vent 213 can be arranged at the lower side of the covering layer 212. When the upper opening 21, the first mesh 211 and the covering layer 212 are all rectangular, the upper side, the left side and the right side of the covering layer 212 can be fixedly sewn to the first mesh 211 and the surface layer 101, and the lower side thereof is constructed to form the vent 213. The heat inside the down jacket will move upward, so it is not easy to overflow from the vent 213 that opens downward. It can be seen that arranging the vent 213 at the lower side can make the covering layer 212 have a better heat preservation effect.

[0050] In one embodiment of the present disclosure, reference Figure 3 The down jacket of the present disclosure further includes a second mesh 221, which is configured to cover the lower opening 22. The surface layer 101 and the liner 102 located at the bottom of the down jacket are configured to be spliced ​​together through the second mesh 221. The second mesh 221 may be provided with mesh holes with a very small diameter, specifically, the diameter of the mesh holes may be about 0.1-0.3 cm. This can prevent things other than water and air from entering the channel from the lower opening 22, and at the same time, the second mesh 221 prevents the liner 102 from being directly exposed to the outside.

[0051] In one embodiment of the present disclosure, reference Figure 4 The surface layer 101 is configured to extend downward to form an extension portion, and a hem 3 is provided at the bottom of the down jacket. The hem 3 is configured to be provided inside the extension portion and is configured to be connected to the liner 102 through the second mesh 221. A filling layer 30 is provided in the hem 3, and the filling layer 30 is generally made of a relatively stiff material with a certain elasticity. The hem 3 can extend to a position beyond the lower opening 22, thereby preventing wind from blowing in from the lower opening 22 when the down jacket is normally worn, thereby improving the thermal insulation effect of the down jacket.

[0052] In one embodiment of the present disclosure, reference Figure 3 A drawstring is provided in the hem 3, and the drawstring is configured to adjust the size of the hem 3. Drawstring buckles 31 may be provided at both ends of the drawstring, and the drawstring buckles 31 can flexibly control the length of the drawstring through an internal elastic element. Figure 3As shown, the two drawstring buckles 31 can be respectively located near the two ends of the hem 3, and the user can adjust the size of the hem 3 by controlling the two drawstring buckles 31. In colder weather, the user can tighten the drawstring to reduce the size of the hem 3 and prevent wind from blowing in from the bottom of the down jacket.

[0053] In one embodiment of the present disclosure, Figure 3 As shown, the lower opening 22 is constructed to be continuously arranged at the bottom of the back piece 11 of the down jacket. The lower opening 22 in this embodiment is relatively large, and water and air can be quickly discharged from the lower opening 22, which improves the drainage efficiency. However, the lower openings 22 arranged continuously will cause the surface layer 101 and the liner 102 at the bottom of the back piece 11 to be completely separated. In a windy environment, if the wind blows in from the bottom of the down jacket, a large amount of wind may be blown in between the surface layer 101 and the liner 102, which may easily make the user feel cold.

[0054] In another embodiment of the present disclosure, a plurality of lower openings 22 may be provided, and the plurality of lower openings 22 are constructed to be arranged at intervals at the bottom of the down jacket. At the junction between two adjacent lower openings 22, the liner 102 is configured to be fixedly sewn to the surface layer 101. In this embodiment, a continuously arranged lower opening 22 is divided into a plurality of spaced lower openings 22, and the size of each lower opening 22 is relatively small, thereby preventing wind from blowing in from the lower opening 22. At the same time, the plurality of lower openings 22 are spaced at the bottom of the down jacket, and may be arranged only at the bottom of the rear piece 11 of the main body, or may also be arranged at the bottom of the side piece 12 and the front piece 13 of the main body. The total opening range of the plurality of lower openings 22 is large, so the lower openings 22 in this embodiment can still ensure a high drainage efficiency.

[0055] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A washable breathable down jacket, characterized in that: include: A surface layer (101), the surface layer (101) being arranged on an outer side away from a human body; An inner liner (102), the inner liner (102) being arranged on the inner side close to the human body, and a filling layer (1021) being arranged in the inner liner (102); A channel (2), the channel (2) being arranged between the surface layer (101) and the liner (102); the channel (2) comprising an upper opening (21) and a lower opening (22); the upper opening (21) being arranged on the surface layer (101) at the upper part of the back piece (11) of the down jacket; the lower opening (22) being constructed to be located at the bottom of the down jacket.

2. The washable breathable down jacket according to claim 1, characterized in that: It also includes a first mesh cloth (211), wherein the first mesh cloth (211) is configured to cover the upper opening (21).

3. The washable breathable down jacket according to claim 2, characterized in that: The invention also comprises a covering layer (212), wherein the covering layer (212) is configured to be arranged on the outside of the first mesh cloth (211) and to cover the first mesh cloth (211); at least one side of the covering layer (212) is configured to be provided with a vent (213).

4. The washable breathable down jacket according to claim 1, characterized in that: It also includes a second mesh cloth (221), which is configured to cover the lower opening (22); the surface layer (101) and the liner (102) located at the bottom of the down jacket are configured to be spliced ​​together via the second mesh cloth (221).

5. The washable breathable down jacket according to claim 4, characterized in that: The surface layer (101) is configured to extend downward to form an extension portion; a hem (3) is provided at the bottom of the down jacket, and the hem (3) is configured to be provided inside the extension portion and is configured to be connected to the liner (102) via the second mesh cloth (221).

6. The washable breathable down jacket according to claim 5, characterized in that: A drawstring is arranged inside the hem (3), and the drawstring is configured to be used for adjusting the size of the hem (3).

7. The washable breathable down jacket according to claim 1, characterized in that: The lower opening (22) is constructed to be continuously arranged at the bottom position of the back piece (11) of the down jacket.

8. The washable breathable down jacket according to claim 1, characterized in that: A plurality of the lower openings (22) are provided, and the plurality of lower openings (22) are configured to be arranged at intervals at the bottom of the down jacket.

9. The washable breathable down jacket according to claim 7, characterized in that: At the junction position between two adjacent lower openings (22), the inner liner (102) is configured to be fixedly sewn to the surface layer (101).

10. The washable breathable down jacket according to claim 1, characterized in that: The liner also includes an inner layer (1022) and an intermediate layer (1023), wherein the inner layer (1022) is arranged on the inner side close to the human body, and the intermediate layer (1023) is arranged on the inner side of the surface layer (101) and is constructed to be enclosed with the inner layer (1022) to form the filling layer (1021); a plurality of quilting lines (14) are sewn on the inner side of the down jacket, and the plurality of quilting lines (14) are configured to sew the inner layer (1022) and the intermediate layer (1023) together, so as to separate the filling layer (1021) into a plurality of filling cavities.