WO2021172820A1

WO2021172820A1 - Filter housing apparatus for water purifying apparatus and water purifying apparatus comprising same

Info

Publication number: WO2021172820A1
Application number: PCT/KR2021/002168
Authority: WO
Inventors: 이인규; 이종일; 이종국
Original assignee: 이인규; 이종일; 이종국
Priority date: 2020-02-24
Filing date: 2021-02-22
Publication date: 2021-09-02
Also published as: KR102416530B1; KR20210107342A

Abstract

A filter housing apparatus for a water purifying apparatus may comprise: a body unit including a space for accommodating a filter for the water purifying apparatus, a vacuum layer surrounding the space, and a water inlet for introducing raw water into the space; a water outlet which is configured to be coupled to the body unit for covering an upper portion of the space, and which outputs purified water that has passed through the filter; and a water channel from the space to the water outlet. Also, the water purifying apparatus may comprise: at least one filter housing apparatus configured as above; at least one filter accommodated respectively in the at least one filter housing apparatus and configured to remove foreign substances from the raw water; and a case unit for accommodating the at least one filter housing apparatus. As such, the housing apparatus for accommodating a filter in a water purifying apparatus is configured to have the body unit of a tumbler shape and a lid unit covering the body unit, and thus, the water purifying apparatus can be installed directly on a kitchen sink and can output purified water directly through a water faucet irrespective of whether the water is cold water or hot water. Thus, domestic water can be used easily and safely at any time.

Description

Filter housing device for water purification device and water purification device including same

Embodiments relate to a filter housing device for a water purification device and a water purification device including the same. More specifically, the embodiments are located inside the water purifying device and consist of a tumbler-shaped body part and a lid part covering the housing device for accommodating the filter therein, so as to remove foreign substances from the water discharged from the faucet. It is related to the water purifying device that can be installed in the sink.

As environmental pollution becomes more serious, tap water is generally not used directly for drinking at home and at work, but purified water using a separate water purifier is used as drinking water. Such a water purifier is configured to receive raw water, pass it through various filters, and then discharge it, and various types and types of filters are used depending on the purpose of the water purification and the state of the raw water.

In addition, the water purifier is equipped with a general water purifier with only a simple water purification function that filters various impurities and heavy metals contained in the raw water, and a separate heating and cooling device in addition to the water purification function to control the temperature of the purified raw water. There is also a hot/cold water purifier with a function that allows you to select and use cold water and hot water.

However, the conventional water purifier has been developed only for the purpose of producing drinking water that can be drunk by receiving purified water in a cup, and it is necessary to wash rice or vegetables in the kitchen to cook food or wash dishes, and hygiene to wash the body. There have been few studies on water purifiers for water use.

For this reason, users who want to purify the drinking water have the inconvenience of receiving water from the drinking water purifier and moving it to the sink to cook rice and use it for soup. In addition, even when purified water is required for rinsing after washing dishes, there is an inconvenience of receiving and using water from a water purifier, so most users give up using purified water for washing dishes.

Also, in the case of purifying sanitary water, although many water purifying devices for showers have been developed, most of them have only a function of removing rust, so the effect is fragmentary.

On the other hand, in the case of a water purifying device for drinking water that has been developed and used, there is a water purifying device in which water purified using a general water purifier is drilled in one corner of a sink and a cock (aka, faucet) for cooking water is installed and used. However, these water purifying devices also have various problems, so they are often reluctant to install or are inconvenient to install and use, and are often left unattended.

In particular, the sink is made of stainless steel and once a hole is drilled there is a problem that it is not easy to restore. The biggest downside is there.

In addition, the conventional water purifying device is impractical because the water pressure of purified water discharged through the faucet is very weak, so if you give up using it in the middle, you cannot remove this facility and leave it unattended, making it difficult to use the sink. This makes it very inconvenient to use the sink.

According to one aspect of the present invention, it is possible to use drinking water easily and safely at any time by allowing purified water to be dispensed without distinguishing between cold water and hot water directly through the faucet, and management such as filter replacement is easy enough that anyone can perform, It is possible to provide a filter housing device for a water purifying device that does not cause an accident due to leakage or backflow, and a water purifying device including the same.

A filter housing device for a water purification device according to an embodiment of the present invention includes a space for accommodating a filter for a water purification device, a vacuum layer surrounding the space, and an inlet for receiving raw water into the space. wealth; and a lid part configured to be coupled to the body part to cover the upper part of the space, and including a water outlet through which purified water passing through the filter is discharged and a water passage from the space to the water outlet.

In one embodiment, the lid portion includes a protrusion configured to be inserted into the body portion when the screw thread for coupling to the inner surface of the body portion is formed by the rotation of the lid portion and the lid portion and the body portion are coupled.

In one embodiment, the body portion includes a first fixing jaw protruding outwardly of the body portion in a direction in which the cross-sectional diameter of the body portion increases on a surface of the body portion opposite to the lid portion, the lid portion, the and a second fixing jaw protruding to the outside of the lid portion in a direction in which the cross-sectional diameter of the lid portion increases on a surface of the lid portion opposite to the body portion. In this case, the first fixing jaw and the second fixing jaw are to be coupled to the fixing belt.

The filter housing device for a water purifying device according to an embodiment further includes the fixing belt coupled to the first fixing jaw and the second fixing jaw to prevent the lid from being separated from the body.

In one embodiment, the fixing belt, a pair of belt belts arranged to surround the first fixing jaw and the second fixing jaw; a fastening part in a concave-convex shape for coupling one end of the pair of belt strips to each other; and a ring lock lever coupled to the other end of the pair of belt strips and configured to couple or separate the pair of belt strips from each other.

In an embodiment, each of the pair of belt strips has a cross section of a concave-convex shape including a recessed portion for inserting the first fixing jaw and the second fixing jaw.

A water purifying device according to an embodiment includes one or more filter housing devices configured according to any one of the above embodiments; one or more filters each housed within the one or more filter housing devices and configured to remove foreign matter from the raw water; and a case portion configured to receive the one or more filter housing devices.

In one embodiment, the at least one filter housing arrangement comprises: a first housing arrangement configured to receive a cold water settling filter; a second housing device connected to the first housing device and configured to accommodate a cold water carbon filter; a third housing device configured to receive the hot water settling filter; and a fourth housing device connected to the third housing device and configured to accommodate the hot water carbon filter.

The water purifying device according to an embodiment further includes a drinking filter configured to remove foreign substances from the raw water that has passed through the filters in the one or more housing devices to discharge water.

In one embodiment, the drinking filter comprises at least one of a membrane filter and a carbon filter.

By using the filter housing device for a water purification device according to an aspect of the present invention in the water purification device, residual chlorine, rust, Heavy metals or other foreign substances can be removed. Therefore, there is an advantage that safe and fresh water can be used at any time when using water related to food or sanitary water for washing the body, such as washing rice or vegetables or washing dishes.

In addition, the filter housing device for a water purifying device and the water purifying device including the same according to an aspect of the present invention can be used by easily connecting to an already in use device or a cold/hot water device, and the housing device for accommodating the filter is a tumbler. It is composed of a body in the shape of a body and a lid that covers it, so anyone can easily replace the filter, etc.

1 is a side view of a water purifying device to which a filter housing device according to an embodiment is applied.

FIG. 2 is an internal configuration diagram of the water purifying device shown in FIG. 1 .

3 is a cross-sectional view illustrating an internal configuration of a filter housing device according to an embodiment.

4 is a cross-sectional view illustrating a form in which a filter is accommodated in the filter housing device of FIG. 3 .

5A is a perspective view illustrating a form in which a filter housing device according to an exemplary embodiment is coupled to a lid;

Fig. 5b is an exploded perspective view of the filter housing device shown in Fig. 5a;

6A is a plan view illustrating a form in which a fixing belt is coupled to a lid part of a filter housing device according to an exemplary embodiment;

Fig. 6b is a side view of a lid portion of the filter housing device shown in Fig. 6a;

6C is a front view illustrating a form in which a fixing belt is coupled to a filter housing device according to an exemplary embodiment.

7A is a side view of a fixing belt coupled to a filter housing device according to an exemplary embodiment;

Figure 7b is a plan view of the fixing belt shown in Figure 7a.

Figure 7c is a partial perspective view of the fixing belt shown in Figure 7a.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

When a part is referred to as being “above” another part in the present specification, it may be directly on the other part or the other part may be involved in between. In contrast, when a part refers to being "directly above" another part, no other part is involved in between.

The terms first, second, third, etc. are used herein to describe, but are not limited to, various parts, components, regions, layers and/or sections. These terms are used only to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, a first part, component, region, layer or section described below may be referred to as a second part, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of referring to specific embodiments only, and is not intended to limit the present invention. As used herein, the singular forms also include the plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and includes the presence or absence of another characteristic, region, integer, step, operation, element and/or component. It does not exclude additions.

In this specification, terms indicating a relative space such as “below” and “above” may be used to more easily describe the relationship of one part shown in the drawings to another part. These terms are intended to include other meanings or operations of the device in use with the meanings intended in the drawings. For example, if the device in the drawings is turned over, some parts described as being "below" other parts are described as being "above" other parts. Thus, the exemplary term “down” includes both the up and down directions. The device may be rotated 90° or other angles, and terms denoting relative space are interpreted accordingly.

Although not defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Commonly used terms defined in the dictionary are additionally interpreted as having a meaning consistent with the related technical literature and the presently disclosed content, and unless defined, they are not interpreted in an ideal or very formal meaning.

Referring to FIG. 1 , the water purifying device includes a case portion that forms an outer surface of the device while protecting the components of the device and hiding complex structures and parts therein. In the embodiment shown in FIG. 1 , the case part includes a lower case 200 corresponding to the base of the device and an upper case 100 corresponding to a cover thereof. The upper case 100 and the lower case 200 may be interconnected by a fixing pin (not shown) or the like.

The lower case 200 accommodates various parts of the water purifying device, and includes a water purifying device that receives raw water, an outlet through which purified water is discharged, and a water channel therebetween. In one embodiment, the lower case 200 may include a cold water outlet 201 , a cold water inlet 202 , a hot water outlet 203 , and a hot water inlet 204 . A valve (not shown) may be coupled to each of the

water outlets

201 and 203 . The front surface of the lower case 200 may have a shape that protrudes forward with an inclination of a predetermined angle (eg, 45 degrees) to facilitate management of internal parts.

Also, the lower case 200 may include a drain hole 205 . The drain hole 205 may be used for discharging water from the inside of the water purifying device, such as when replacing a filter inside the lower case 200 . In addition, the drain hole 205 has a structure in which water leakage that may occur during use of the water purifying device falls into the lower case 200 and can be directly discharged through the drain hole. In addition, the drain hole 205 is attached to the lower case 200 and is formed in a protruding shape or is formed in a structure that can be directly connected to the sewer, and may have a structure for preventing backflow. For example, it may be configured such that the water discharged from the sink in which the water purifying device according to the present embodiment is installed and the water generated from the water purifying device are discharged to the sewer using the same passage. In an embodiment, a cap and a hose for preventing backflow may be connected to the drain port 205 .

Referring to FIG. 2 , the water purification device is configured to receive one or more

filter housing devices

30 , 40 , 50 , 60 , wherein each filter

housing device

30 , 40 , 50 , 60 contains raw water. One or more filters for removing foreign substances may be disposed. The water purifying device is connected to a water supply pipe to introduce hot or cold water, or receives raw water through an inlet 302 of a pipe 70 connected to another water purifier or cooking water valve that is installed and used in the past. The supplied raw water passes through the filters in the

filter housing device

30 , 40 , 50 , and 60 , and foreign substances are removed, and is discharged through the cold water outlet 301 of the pipe 45 or the hot water outlet 303 of the pipe 65 . do. On the other hand, the filtered foreign material or leaked water may be drained through the drain hole 310 at the bottom of the device.

In one embodiment, the water purification device comprises a cold water purification section comprising a first housing device 30 and a second housing device 40 , and a hot water purification section comprising a third housing device 50 and a fourth housing device 60 . is divided into In this specification, cold water refers to a general constant in a heated or uncooled state.

The first and

third housing devices

30 and 50 are configured to receive a precipitation filter that receives raw water from the acquisition pipe 70 and removes foreign substances such as rust. In addition, the second and

fourth housing devices

40 and 60 are connected to the first and

third housing devices

30 and 50 by

pipes

35 and 55, respectively, so that the first and third housing devices 30, 50) is configured to accommodate a carbon filter that additionally removes foreign substances such as chlorine or heavy metals from the raw water. That is, in the present embodiment, the first to fourth

filter housing devices

30 , 40 , 50 , and 60 have a configuration in which a multi-stage complex type filter designed for each filter housing device is inserted into the housing device.

In one embodiment, the water purifying device precisely purifies the purified water filtered by the filters in the

filter housing device

30 , 40 , 50 , 60 once again, improves the taste of the water, and provides drinking water (or cooking water). It further includes a drinking filter (10, 20). For example, the drinking filter may include a membrane filter 20 and a carbon filter 10 . The membrane filter 20 performs precise purification of raw water that has passed through the

filter housing devices

30 , 40 , 50 , and 60 , and the carbon filter 10 purifies the precisely purified water again to improve the quality of water taste and freshness. serves to increase The membrane filter 20 and the carbon filter 10 may be coupled to one or more

filter housing devices

30 , 40 , 50 , 60 using a fixing frame such as a bracket.

The membrane filter 20 is connected to the cold water carbon filter by a pipe 25 , and the carbon filter 10 is connected to the membrane filter 20 by a pipe 15 , the membrane filter 20 and the carbon filter 10 . ) can be discharged as drinking water. However, the filter configuration of the drinking filter is not limited thereto.

3 is a cross-sectional view illustrating an internal configuration of a filter housing device according to an exemplary embodiment, and FIG. 4 is a cross-sectional view illustrating a form in which a filter is accommodated in the filter housing device of FIG. 3 .

3 and 4, the filter housing device according to the present embodiment is made of a body portion 80 formed of a metal such as stainless steel or other suitable material, and plastic or other suitable material. It has a tumbler shape including a lid part 90 formed to cover the upper part of the body part 80 . The body portion 80 may have a cross section of a circle, an ellipse, or another different shape and may have a cylinder shape extending up and down. A space 800 in which one or more filters 1000 can be accommodated is formed inside the inner surface of the body 80, and a vacuum layer ( 81) may be located. The vacuum layer 81 serves to prevent the hot temperature of the hot water from being transmitted directly to the outside, and to prevent dew condensation due to the difference between the cold water and the outside temperature.

The body part 80 includes a receiving part 82 from which raw water is obtained, and the obtained raw water is purified while passing through the multi-stage filter 1000 disposed in the space 800 inside the body part 80 . In the case of the housing device for accommodating the sedimentation filter, the acquisition unit 82 may be configured to be connected to a tap water hose in a one-touch or screw form as a passage through which tap water is introduced. On the other hand, in the case of the housing device for accommodating the carbon filter, a hose for transporting purified water that has passed through the settling filter may be connected to the acquisition unit 82 .

A rubber ring 1100 separating the filters from each other is positioned between each filter 1000 accommodated in the space 800 of the body 80 . The raw water obtained from the acquisition unit 82 at the lower part of the filter housing device flows into the filter from the side of each filter 1000 and is purified while passing through the filter 1000, and then through the opening of the rubber ring 1100 to the upper part. moves in the direction of the next filter 1000 of . The purified water filtered by the multi-stage filter 1000 through the above process moves through the water channel formed inside the lid part 90 and is discharged through the opening 91 of the water outlet 96 .

A screw line 84 may be formed on the inner surface of the body portion 80 . In addition, the lid part 90 includes a protrusion 92 for insertion into the body part 80, and the surface of the protrusion part 92 has a thread shape corresponding to the thread 84 of the inner surface of the body part 80 ( 94) can be formed. Therefore, by turning the lid part 90 to match the body part 80 so that the

respective threads

84 and 94 are aligned with each other, the lid part is closed so that the space 800 of the body part 80 is sealed by the lid part 90 . (90) may be coupled to the body portion (80). In addition, a rubber packing for preventing water leakage may be provided on the inner surface of the protrusion 92 of the lid part 90 and/or the body part 80 opposite thereto.

In one embodiment, the upper part of the lid part 90 is made of a plastic-based material that is easy to connect to a bracket or screw so that it does not move by fixing it, and is located at the bottom of the lid part 90 and the body part 80 The protrusion 92 to be coupled to the may be made of a non-corrosive metal material such as stainless steel. Alternatively, a portion of the lid portion 90 that comes into contact with water is made of a non-corrosive metal material such as stainless steel, and a plastic-based material is covered on the metal portion to form the outer surface of the lid portion 90 .

In one embodiment, the body portion 80 has a fixing jaw 83 (or a first fixing jaw) protruding outwardly from the outer periphery in a direction in which the cross-sectional diameter thereof increases on the upper surface opposite to the lid portion 90 . include Similarly, the lid part 90 has a fixed jaw ( 93) (or the second fixing jaw). Both fixing

jaws

83 and 93 are coupled to the fixing belt 95 in order to prevent the body portion 80 and the lid portion 90 coupled to each other from falling off due to water pressure.

5A is a perspective view illustrating a form in which the filter housing device according to an exemplary embodiment is coupled with a lid, and FIG. 5B is an exploded perspective view of the filter housing device shown in FIG. 5A .

5A and 5B, when the protrusion 92 of the lid part 90 is inserted into the inner surface of the body part 80, the fixing jaws formed on each of the body part 80 and the lid part 90 are aligned with each other. and a fixed belt may be coupled to the fixed jaws in contact with each other. The fixing belt includes a pair of

belt belts

951 and 952 configured to surround the fixing jaw, and the

belt belts

951 and 952 may be coupled to or separated from each other by the ring lock levers 953 and 954 . This will be described in detail with reference to FIGS. 6A to 6C.

6A is a plan view illustrating a form in which a fixing belt is coupled to a lid part of the filter housing device according to an exemplary embodiment, and FIG. 6B is a side view of the lid part of the filter housing device shown in FIG. 6A . Also, FIG. 6C is a front view illustrating a form in which a fixing belt is coupled to the filter housing device according to an exemplary embodiment.

6A to 6C, the fixing belt 95 coupled to the filter housing device according to the present embodiment has the body cover 90 due to the sudden rise in water pressure and shock (so-called water hammer). It is a device for preventing falling off from the part (80). In one embodiment, the fixing belt 95 includes a concave-convex fastening part 950 and a pair of

belt bands

951 and 952 interconnected by the fastening part 950 . Ring lock levers 953 and 954 are coupled to the other end of the

belt bands

951 and 952 that are not connected to the fastening portion 950 . That is, a locking ring 953 is coupled to one end of the belt strip 951 , and a square ring 954 that can be coupled to the locking ring 953 may be coupled to one end of the belt strip 952 .

The pair of

belt bands

951 and 953 are portions arranged to surround the surfaces of the fixing jaw 93 of the lid part 90 and the fixing jaw 83 of the body part 80 . In one embodiment, the belt belt (951, 952) has a central portion of the belt belt (951, 952) is recessed inward so that the fixing jaws (83, 93) can be inserted into the belt belt (951, 952) ' It may have a cross section of a concave-convex shape such as a 'c'. This cross-sectional shape has a 'U'-shaped cross section and is formed by combining a clip made of metal or the like to the

belt belts

951 and 952 or forming the

belt belts

951 and 952 itself with a metal belt having such a shape. can be implemented.

The fastening part 950 may be fixed by attaching it to the rear surface of the lid part 90 using a screw or a bolt-type pin. To this end, the

belt bands

951 and 952 are configured so that no concave-convex clips are present in the portion to which the fastening part 950 is coupled, and the shape of the concave-convex-shaped clip or the belt band itself combines the fastening part 950 . It can be configured so as not to be disturbed by time. On the other hand, the locking ring 953 and the square ring 954 coupled to the

belt bands

951 and 952 may be coupled at the center of the front surface of the filter housing device opposite to the fastening part 950 .

7A is a side view of the fixing belt coupled to the filter housing device according to an embodiment, FIG. 7B is a plan view of the fixing belt shown in FIG. 7A, and FIG. 7C is a partial perspective view of the fixing belt shown in FIG. 7A.

7A to 7C, the fixing belt includes a ring lock lever configured to hook and fix the locking ring 953 coupled to one side of the belt strip to the square ring 954 coupled to one side of the other belt strip. . Although the figure shows that the belt belt of the fixed belt is curved in a circular shape, in another embodiment, the belt belt of the fixed belt may have a form in which straight parts are connected to each other so that they are bent using joints.

In one embodiment, the ring lock lever further includes an articulation lever 956 extending from the locking ring 953 as shown in Fig. 7c, and the articulation lever 956 is a lever bar ( It is connected to one end of the 955, the other end of the lever bar (955) is connected to the end of the belt strip (951). The lever bar 955 serves as a support and a lever when pulling the locking ring 953 to the square ring 954 . That is, in this embodiment, the ring lock lever has a structure in which the locking ring 953 is coupled to the square ring 954 in the form of a three-stage joint using the principle of the lever.

In one embodiment, an unlocking handle 957 is further connected to the opposite end of the locking ring 953 in the articulating lever 956 . The locking ring 953 is in close contact with the filter housing device by a tensile force generated while the locking ring 953 hooks and pulls the square ring 954 . However, in this close state, since it is very difficult to release the locking ring 953 by hand, in this embodiment, the lever-shaped lock release handle 957 on the opposite side of the locking ring 953 in the articulation lever 956) by lifting the lock release handle 957 to allow the locking ring 953 to be easily removed from the square ring 954. For the above operation, the lock release handle 957 may be formed to extend from the joint lever 956 by being bent in the opposite direction to the direction in which the hook of the locking ring 953 is bent.

Although the present invention described above has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and variations of the embodiments are possible therefrom. However, such modifications should be considered to be within the technical protection scope of the present invention. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

Claims

a body portion including a space for receiving a filter for a water purification device, a vacuum layer surrounding the space, and an inlet for receiving raw water into the space; and

A filter housing device for a water purifying device comprising: a lid coupled to the body to cover the upper portion of the space; and a lid including an outlet through which purified water passing through the filter is discharged and a water passage from the space to the water outlet.
According to claim 1,

The lid part has a screw thread for coupling to the inner surface of the body part by rotation of the lid part and includes a protrusion configured to be inserted into the body part when the lid part and the body part are coupled. .
According to claim 1,

The body portion includes a first fixing jaw protruding outward of the body portion in a direction in which the cross-sectional diameter of the body portion increases on a surface of the body portion opposite to the lid portion,

The lid portion includes a second fixing jaw protruding outside the lid portion in a direction in which the cross-sectional diameter of the lid portion increases on a surface of the lid portion opposite to the body portion,

The first fixing jaw and the second fixing jaw are to be coupled to the fixing belt, the filter housing device for a water purification device.
4. The method of claim 3,

and the fixing belt coupled to the first fixing jaw and the second fixing jaw to prevent the lid from being separated from the body.
5. The method of claim 4,

The fixing belt is

a pair of belt bands disposed to surround the first fixing jaw and the second fixing jaw;

a fastening part in a concave-convex shape for coupling one end of the pair of belt strips to each other; and

and a ring lock lever coupled to the other end of the pair of belt strips and configured to couple or separate the pair of belt strips from each other.
6. The method of claim 5,

Each of the pair of belt strips has a concave-convex cross section including a recessed portion for inserting the first fixing jaw and the second fixing jaw into a filter housing device for a water purification device.
at least one filter housing arrangement according to any one of claims 1 to 6;

one or more filters each housed within the one or more filter housing devices and configured to remove foreign matter from the raw water; and

and a case portion configured to receive the one or more filter housing devices.
8. The method of claim 7,

The at least one filter housing device comprises:

a first housing arrangement configured to receive a cold water settling filter;

a second housing device connected to the first housing device and configured to accommodate a cold water carbon filter;

a third housing device configured to receive the hot water settling filter; and

and a fourth housing device connected to the third housing device and configured to accommodate the hot water carbon filter.
8. The method of claim 7,

and a drinking filter configured to remove foreign substances from the raw water that has passed through the filter in the one or more housing devices to discharge water.
10. The method of claim 9,

The drinking filter is a water purification device comprising at least one of a membrane filter and a carbon filter.