cleaner

Abstract

The present disclosure relates to a cleaner. A cleaner according to an embodiment of the present disclosure includes a cleaning module sucking in outside air, a main body providing a suction force to the cleaning module, a first steering part rotatably coupled to the cleaning module and rotating the main body about a rolling axis disposed in a forward-rearward direction, a second steering part rotatably coupled to the first steering part and rotating the main body about a pitching axis disposed in a left-right direction, and a pair of wheels rotatably coupled to the cleaning module and rollably moving while in contact with a surface to be cleaned, wherein, based on a state in which the pair of wheels rollably move over the surface to be cleaned, a point where extension lines of rotation axes of the wheels intersect is located higher than an imaginary straight line that connects centers of the wheels, and the second steering part rotates about the rolling axis in conjunction with rotation of the first steering part so as to reciprocate between the pair of wheels.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a cleaner and, more particularly, to a cleaner, in which rotation of a wheel and rotation of a connection tube are performed independently of each other.BACKGROUND ART

[0002] In general, a cleaner refers to an electrical appliance that draws in small debris or dust by sucking in air using electricity and fills a dust bin inside a product, and is commonly called a vacuum cleaner.

[0003] Such a cleaner may be classified into a manual cleaner that is directly moved by a user to perform a cleaning operation, and an automatic cleaner that performs a cleaning operation while autonomously traveling. Depending on the shape of the cleaner, the manual cleaner may be classified into a canister cleaner, an upright cleaner, a handheld cleaner, a stick cleaner, and the like.

[0004] In the past, the canister cleaner was widely used as household cleaners. However, recently, the handheld cleaner and the stick cleaner, in which a dust bin and a cleaner main body are integrally provided to improve convenience of use, are gaining more popularity.

[0005] In the case of the canister cleaner, a main body and a suction port are connected to each other by a rubber hose or pipe, and in some cases, the canister cleaner is used by fitting a brush into the suction port.

[0006] The handheld cleaner (hand vacuum cleaner) is designed to maximize portability and is light in weight. However, since the handheld cleaner is short in length, it may be limited in a cleaning area in which a user sits and cleans. Therefore, the handheld cleaner is used to clean a local area such as on a desk, a sofa, or an interior of a vehicle. The handheld cleaner may be used standing up, so a user can perform a cleaning operation without bending his / her waist. Therefore, the handheld cleaner is advantageous for the user to clean a wide area while moving.

[0007] A cleaner head rotates about a plurality of axes for steering. Hereinafter, the plurality of axes will be defined assuming that a direction in which the cleaner head advances forward is a forward direction. Rolling refers to a state in which left and right ends rotate up and down about a forward-rearward axis. Pitching refers to a state in which front and rear ends rotate up and down about a left-right axis. Yawing refers to a state in which left and right ends rotate forward and rearward about an up-down axis.

[0008] Meanwhile, Korean Patent No. 10-131134 discloses a cleaner including a cleaner head that moves by a pair of wheels.

[0009] The cleaner includes a connection tube through which air sucked from the cleaner head flows, and the pair of wheels are rotatably attached to the connection tube to steer movement of the cleaner head.

[0010] However, in the above-described cleaner, due to its structure in which the pair of wheels rotatably are coupled to the connection tube, when a user rotates the connection tube, each wheel rotates together with the connection tube. Accordingly, there is a problem in that when the user rotates the connection tube, only one wheel of the pair of wheels may come into contact with a surface to be cleaned or a contact surface of the wheel may not come into contact with the surface to be cleaned, which may deteriorate steerability of the cleaner.

[0011] Additionally, the above-described cleaner is also problematic in that movement of the cleaner head may not be stably guided because the contact surface of each wheel decreases when the diameter of an inner flow path of the connection tube increases to increase the flow of air sucked from the surface to be cleaned.DISCLOSURETechnical Problem

[0012] Accordingly, the present disclosure has been made keeping in mind the above problems occurring in the related art, and an objective of the present disclosure is to provide a cleaner with improved operability of a cleaning module.

[0013] Additionally, another objective of the present disclosure is to provide a cleaner in which movement of a cleaning module is stably achieved by a pair of wheels.

[0014] Additionally, still another objective of the present disclosure is to provide a cleaner that tilts at various angles by combining rotation directions of each steering part, thereby increasing user convenience.Technical Solution

[0015] In order to accomplish the above objectives, the present disclosure provides a cleaner, including: a cleaning module configured to suck in outside air; a main body configured to provide a suction force to the cleaning module; a first steering part rotatably coupled to the cleaning module and configured to rotate the main body about a rolling axis disposed in a forward-rearward direction; a second steering part rotatably coupled to the first steering part and configured to rotate the main body about a pitching axis disposed in a left-right direction; and a pair of wheels rotatably coupled to the cleaning module and configured to rollably move while in contact with a surface to be cleaned, wherein, based on a state in which the pair of wheels rollably move over the surface to be cleaned, a point where extension lines of rotation axes of the wheels intersect may be located higher than an imaginary straight line that connects centers of the wheels, and the second steering part may rotate about the rolling axis in conjunction with rotation of the first steering part so as to reciprocate between the pair of wheels.

[0016] In order to accomplish the above objectives, the present disclosure provides a cleaner, including: a cleaning module configured to suck in outside air; a main body configured to provide a suction force to the cleaning module; a first steering part rotatably coupled to the cleaning module and configured to roll the main body; a second steering part rotatably coupled to the first steering part and configured to pitch the main body; and a pair of wheels rotatably coupled to the cleaning module and configured to rollably move while in contact with a surface to be cleaned, wherein, based on a state in which the pair of wheels rollably move over the surface to be cleaned, a point where extension lines of rotation axes of the wheels intersect may be located higher than an imaginary straight line that connects centers of the wheels, and the second steering part may rotate about a longitudinal axis of the first steering part in conjunction with rolling of the first steering part so as to reciprocate between the pair of wheels.

[0017] A surface of each of the pair of wheels that comes into contact with the surface to be cleaned may be formed to correspond to the surface to be cleaned.

[0018] Rotation of each of the pair of wheels and rotation of the first steering part about the rolling axis may be performed independent of each other.

[0019] The second steering part may rotate within a predetermined angular range about the rolling axis in a state in which the main body rotates about the pitching axis so that an extension line of a longitudinal axis of the second steering part intersects an extension line of the rolling axis.

[0020] The pitching axis may be disposed between the imaginary straight line connecting the centers of the pair of wheels and the cleaning module.

[0021] Rotation of each of the pair of wheels and rolling of the first steering part may be performed independently of each other.

[0022] The surface to be cleaned may be a carpet.

[0023] The pair of wheels may be arranged to be inclined upward in opposite directions.

[0024] A distance between the pair of wheels may increase as the wheels become farther away from the surface to be cleaned.

[0025] Each of the pair of wheels may have a dome shape.

[0026] Each of the pair of wheels may have a surface of spherical curvature.

[0027] Each of the pair of wheels may have a trapezoidal-shaped cross-section.

[0028] In order to accomplish the above objectives, the present disclosure provides a cleaner, including: a cleaning module configured to suck in outside air; a main body configured to provide a suction force to the cleaning module; a first steering part rotatably coupled to the cleaning module and configured to rotate the main body about a rolling axis disposed in a forward-rearward direction; a second steering part rotatably coupled to the first steering part and configured to rotate the main body about a pitching axis disposed in a left-right direction; and a pair of wheels rotatably coupled to the cleaning module and configured to rollably move while in contact with a surface to be cleaned, wherein, based on a state in which the pair of wheels rollably move over the surface to be cleaned, a point where extension lines of rotation axes of the wheels intersect may be located higher than an imaginary straight line that connects centers of the wheels, and the second steering part may rotate about the rolling axis behind the cleaning module and the pair of wheels in conjunction with rotation of the first steering part.

[0029] A surface of each of the pair of wheels that comes into contact with the surface to be cleaned may be formed to correspond to the surface to be cleaned.

[0030] In order to accomplish the above objectives, the present disclosure provides a cleaner, including: a cleaning module configured to suck in outside air; a main body configured to provide a suction force to the cleaning module; a first steering part rotatably coupled to the cleaning module and configured to rotate the main body about a pitching axis disposed in a left-right direction; a second steering part rotatably coupled to the first steering part and configured to rotate the main body about a yawing axis disposed in an up-down direction; a third steering part rotatably coupled to the second steering part and configured to rotate the main body about a rolling axis disposed in a forward-rearward direction; and a pair of wheels rotatably coupled to the cleaning module and configured to rollably move while in contact with a surface to be cleaned, wherein, based on a state in which the pair of wheels rollably move over the surface to be cleaned, a point where extension lines of rotation axes of the wheels intersect may be located higher than an imaginary straight line that connects centers of the wheels, and the second steering part may rotate about the yawing axis so as to reciprocate between the pair of wheels.

[0031] A surface of each of the pair of wheels that comes into contact with the surface to be cleaned may be formed to correspond to the surface to be cleaned.

[0032] In order to accomplish the above objectives, the present disclosure provides a cleaner, including: a cleaning module configured to suck in outside air; a main body configured to provide a suction force to the cleaning module; a first steering part rotatably coupled to the cleaning module and configured to rotate the main body about a pitching axis disposed in a left-right direction; a second steering part rotatably coupled to the first steering part and configured to rotate the main body about a rolling axis disposed in a forward-rearward direction; and a pair of wheels rotatably coupled to the cleaning module and configured to rollably move while in contact with a surface to be cleaned, wherein, based on a state in which the pair of wheels rollably move over the surface to be cleaned, a point where extension lines of rotation axes of the wheels intersect may be located higher than an imaginary straight line that connects centers of the wheels, and the pair of wheels may be spaced apart from each other with the first steering part interposed therebetween.

[0033] A surface of each of the pair of wheels that comes into contact with the surface to be cleaned may be formed to correspond to the surface to be cleaned.

[0034] The second steering part may be disposed behind the cleaning module and the pair of wheels.

[0035] Based on a state in which the pair of wheels rollably move over the surface to be cleaned, the second steering part may be bent at an end of the first steering part in a direction farther away from the surface to be cleaned.Advantageous Effects

[0036] As described above, according to a cleaner according to present disclosure, even when a user rotates a main body and a connection tube rotates thereby, each wheel does not rotate together with the connection tube but remains in contact with a surface to be cleaned. Therefore, it is possible to maintain operability of the cleaning module.

[0037] Additionally, according to the present disclosure, even when the diameter of a flow path of a first steering part is increased to increase the amount of air sucked from the surface to be cleaned, the area where each wheel is in contact with the surface to be cleaned is maintained. Therefore, it is possible to stably guide the cleaning module.

[0038] Additionally, according to the present disclosure, the connection tube rotates and tilts in various directions through a plurality of rotation axes, and thus tilts at various angles by combining rotation directions of a plurality of steering parts. Therefore, it is possible to increase user convenience when operating the cleaner.

[0039] The effects of the present disclosure are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the appended claims.DESCRIPTION OF DRAWINGS

[0040] FIG. 1 is a perspective view illustrating a cleaner according to an embodiment of the present disclosure.

[0041] FIG. 2a is a perspective view illustrating a state in which a second steering part rotates downward about a pitching axis in a cleaner according to a first embodiment of the present disclosure.

[0042] FIG. 2b is a perspective view illustrating a state in which the second steering part in FIG. 2a rotates upward about the pitching axis.

[0043] FIG. 2c is a perspective view illustrating a state in which the second steering part in FIG. 2b rotates left about a rolling axis.

[0044] FIG. 3 is a plan view of FIG. 2a.

[0045] FIG. 4 is a bottom view of FIG. 2a.

[0046] FIG. 5 is a side view of FIG. 2a.

[0047] FIG. 6a is a rear view of FIG. 2a.

[0048] FIG. 6b is a rear view of FIG. 2b.

[0049] FIG. 6c is a rear view of FIG. 2c.

[0050] FIG. 7 is a perspective view illustrating a cleaner according to a second embodiment of the present disclosure.

[0051] FIG. 8 is a plan view of FIG. 7.

[0052] FIG. 9 is a bottom view of FIG. 7.

[0053] FIG. 10 is a side view of FIG. 7.

[0054] FIG. 11 is a rear view of FIG. 7.

[0055] FIG. 12 is a perspective view illustrating a cleaner according to a third embodiment of the present disclosure.

[0056] FIG. 13 is a plan view of FIG. 12.

[0057] FIG. 14 is a bottom view of FIG. 12.

[0058] FIG. 15 is a side view of FIG. 12.

[0059] FIG. 16 is a rear view of FIG. 12.

[0060] FIG. 17 is a perspective view illustrating a cleaner according to a fourth embodiment of the present disclosure.

[0061] FIG. 18 is a plan view of FIG. 17.

[0062] FIG. 19 is a bottom view of FIG. 17.

[0063] FIG. 20 is a side view of FIG. 17.

[0064] FIG. 21 is a rear view of FIG. 17.MODE FOR INVENTION

[0065] Hereinbelow, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0066] The present disclosure may be modified in various ways and implemented by various embodiments, so that specific embodiments are shown in the drawings and will be described in detail. However, it is to be understood that the present disclosure is not limited to the specific exemplary embodiments, but includes all modifications, equivalents, and substitutions included in the spirit and the scope of the present disclosure.

[0067] FIG. 1 is a perspective view illustrating a cleaner according to an embodiment of the present disclosure. FIG. 2a is a perspective view illustrating a state in which a second steering part is rotated downward about a pitching axis in a cleaner according to a first embodiment of the present disclosure. FIG. 2b is a perspective view illustrating a state in which the second steering part in FIG. 2a is rotated upward about the pitching axis. FIG. 2c is a perspective view illustrating a state in which the second steering part in FIG. 2b is rotated left about a rolling axis. FIG. 3 is a plan view of FIG. 2a. FIG. 4 is a bottom view of FIG. 2a. FIG. 5 is a side view of FIG. 2a. FIG. 6a is a rear view of FIG. 2a. FIG. 6b is a rear view of FIG. 2b. FIG. 6c is a rear view of FIG. 2c.

[0068] With reference to FIGS. 1 to 6c, a cleaner 1 according to a first embodiment of the present disclosure will be described as follows.

[0069] A cleaning module 100 according to the first embodiment of the present disclosure may be used by being connected to, for example, a handheld cleaner or a canister cleaner.

[0070] Additionally, the term “surface to be cleaned” in this specification may be understood to mean not only a floor surface of a living room or room, but also a surface to be cleaned such as a carpet or flooring.

[0071] The cleaner 1 according to the first embodiment of the present disclosure may include the cleaning module 100.

[0072] The cleaning module 100 may function to suck in foreign substances and air from a surface to be cleaned and guide them to a main body 200.

[0073] The cleaning module 100 may be detachably connected to the main body 200 or an extension tube 300.

[0074] Since the cleaning module 100 is connected to the main body 200 or the extension tube 300, a user may clean the surface to be cleaned using the cleaning module 100. At this time, the main body 200 to which the cleaning module 100 is connected may separate dust in air by a single cyclone method or a multi-cyclone method.

[0075] The cleaning module 100 may be operated by receiving power from the main body 200. Specifically, the cleaning module 100 may be operated by receiving power from a battery 250 provided in the main body 200.

[0076] The cleaning module 100 may include a cleaning module housing 110. The cleaning module housing 110 may include at least one agitator 112 mounted on a lower side thereof, and may define an external appearance of the cleaning module 100. Specifically, the agitator 112 may be mounted in a receiving space extending from the lower side of the cleaning module 100 in a left-right direction, and may be removed through a space open at each of left and right ends of the receiving space. Additionally, the agitator 112 may be formed in a cylindrical shape, but alternatively, it may be formed in a disc shape.

[0077] A suction port 111 may be formed in the cleaning module housing 110. Specifically, the suction port 111 may be formed on a lower surface of the cleaning module housing 110.

[0078] The suction port 111 may refer to a space through which air containing dust is introduced. With this configuration, when a suction motor 220 of the main body 200 is operated, dust and air existing around the surface to be cleaned may be sucked into a flow path of the cleaning module 100 through the suction port 111.

[0079] A suction tube 120 may be coupled to the cleaning module housing 110. The suction tube 120 may be communicated with the suction port 111 or the flow path inside the cleaning module 100. The suction tube 120 may be fixedly coupled to the cleaning module housing 110 so that the cleaning module 100 is kept in a position parallel to the surface to be cleaned even when a connection tube 500, which will be described later, rotates.

[0080] The suction tube 120 may be formed to extend outward from a rear end of the cleaning module housing 110. Additionally, a longitudinal axis of the suction tube 120 may be disposed parallel to the surface to be cleaned in a state in which the lower surface of the cleaning module housing 110 is in contact with the surface to be cleaned. Additionally, a first end of the suction tube 120 may be communicated with the suction port 111, and a second end of the suction tube 120 may be connected to the connection tube 500.

[0081] The cleaning module 100 may include a wheel support 130.

[0082] The wheel support 130 may be formed to extend outward from a rear side of the cleaning module housing 110.

[0083] As an example, the wheel support 130 may be formed to have a pair of wings provided on opposite sides thereof and extending in parallel from the rear side of cleaning module housing 110. As another example, the wheel support 130 may be formed to extend from the rear side of the cleaning module housing 110, and may be disposed to surround a pipe 510 while being spaced from an outer side of the pipe 510.

[0084] A first steering part 520, which will be described later, may be rotatably coupled to a rear end of the wheel support 130.

[0085] A pair of wheels 400, which will be described later, may be rotatably coupled to the wheel support 130. At this time, the pair of wheels 400 may be inclinedly coupled to the wings of the wheel support 130, respectively. As an example, the pair of wheels 400 may be coupled to the wings of the wheel support 130, respectively, so as to be inclined upward in opposite directions.

[0086] The cleaning module housing 110 may include a sealer (not illustrated). The sealer may prevent dust sucked toward the suction port 111 from escaping through a space between the cleaning module housing 110 and the surface to be cleaned. As an example, the sealer may be coupled to a lower rear end of the cleaning module housing 110, and may be made of a plastic or rubber material.

[0087] The cleaning module housing 110 may include a buffer member (not illustrated). The buffer member functions to absorb an impact applied to the cleaning module housing 110, and may be made of an elastically deformable material. As an example, the buffer member may be coupled to a front side of the cleaning module housing 110, and may be made of a rubber material.

[0088] The cleaning module housing 110 may include an LED (not illustrated) that emits light of various colors in a forward direction.

[0089] The cleaning module housing 110 may include a caster 113. Specifically, the caster 113 may be received in a caster receiving hole formed on the lower surface of the cleaning module housing 110. At this time, the caster receiving hole may refer to a space through which at least a part of the caster 113 is exposed to the outside.

[0090] A pair of casters 113 may be arranged at left and right ends of the agitator 112, respectively, so as to be spaced apart from each other by a predetermined distance. Additionally, a pair of caster receiving holes may be arranged at left and right sides of the lower surface of the cleaning module housing, respectively, with the suction port 111 interposed therebetween.

[0091] With this configuration, the cleaner 1 according to the first embodiment of the present disclosure may be supported at four points by the pair of casters 113 and the pair of wheels 400. Accordingly, there is an effect in that when an external force is applied during a cleaning operation, the pair of wheels 400 and the pair of casters 113 may support the cleaning module housing 110, thereby preventing an excessive external force from being applied to the agitator 112 and a load applied to an agitator motor (not illustrated) from increasing.

[0092] Additionally, since the suction port 111 and the pair of caster receiving holes are spaced apart from each other, there is an advantage in that dust flowing toward the suction port 111 may be prevented from flowing into the pair of caster receiving holes.

[0093] The caster receiving hole may be formed so that the caster 113 is rotatable relative to the caster receiving hole. For example, the caster receiving hole may be formed in a circular or oval hole shape. Therefore, even when the caster 113 rotates about a rotation axis orthogonal to the surface to be cleaned, the lower surface of the cleaning module housing 110 may be prevented from interfering with the surface to be cleaned.

[0094] The cleaner 1 according to the first embodiment of the present disclosure may include the main body 200.

[0095] The main body 200 may be connected to the cleaning module 100, and may include a suction motor 220 that provides a suction force to the cleaning module 100.

[0096] The suction motor 220 is a configuration that forms an air flow so that the air containing dust is introduced into a suction part 210. That is, the suction force generated by the suction motor 220 may be applied to the cleaning module 100. At this time, the suction motor 220 may be a brushless DC (BLDC) motor. The BLDC motor is a type of DC motor without a brush. Since the BLDC motor does not have a brush, which is a wearable part, the BLDC motor has advantages in that the motor generates low electrical and mechanical noise, has no problem in high-speed rotation, and generates low rotation noise.

[0097] Meanwhile, the main body 200 may include the suction part 210 through which the air containing dust is sucked.

[0098] The suction part 210, which has a cylindrical shape with a hollow hole formed therein, is a configuration through the air containing dust is sucked. The suction part 210 may provide a suction flow path through which the air containing dust flows. The air containing dust may be guided to the main body 200 through the suction part 210.

[0099] A handle 230 is a configuration that allows the user to grip and move the cleaner 1. The handle may be disposed in the opposite direction of the suction part 210 with respect to a dust bin 240, and may include a grip portion that is gripped by a user's hand. Here, the grip portion may have a substantially cylindrical shape.

[0100] The main body 200 may include an operating part. The operating part is a configuration that allows the user to input instructions to the cleaner 1.

[0101] The operating part may be disposed on an extension line extending in a longitudinal direction of the handle 230. With this arrangement, the user may input instructions by touching the operating part with his / her thumb while gripping the handle 230.

[0102] The main body 200 may include the dust bin 240 that stores dust separated from the air. The dust bin 240 may include a dust collecting body having a cylindrical shape. The dust bin 240 may be communicated with the suction part 210, so the dust contained in the air sucked in through the suction part 210 may be separated from the air and collected in the dust bin 240.

[0103] The cleaner 1 may include the battery 250. The battery 250 is a configuration that supplies power to the main body 200. A battery storage part for storing the battery 250 may be formed in the main body 200. The battery 250 may be inserted into and installed in the battery storage part. The battery 250 may be disposed below the handle 230.

[0104] The battery 250 may be disposed on an extension line extending in a longitudinal direction of the handle 230. With this arrangement, the battery 250 may be disposed not to be biased in one direction among left and right directions, and the user may carry the cleaner 1 easily by gripping the cleaner.

[0105] The cleaner 1 may include the extension tube 300. The extension tube 300 is a configuration that communicates the main body 200 and the cleaning module 100 with each other. The extension tube 300 may have a flow path formed therein and through which the air flows. A lower end of the extension tube 300 may be detachably coupled to the connection tube 500, and an upper end of the extension tube may be detachably coupled to the suction part 210.

[0106] Meanwhile, in the present disclosure, a direction in which the cleaning module 100 is positioned relative to the main body 200 may be defined as a forward direction, and a direction in which the main body 200 is positioned relative to the cleaning module 100 may be defined as a rearward direction. In other words, a direction in which the cleaning module 100 advances forward may refer to a forward direction, and a rearward direction may refer to the opposite direction of the forward direction.

[0107] Additionally, based on a state in which the cleaning module 100 is placed on the surface to be cleaned and / or a floor surface (ground) (a state in which the agitator 112 is in contact with the surface to be cleaned), a direction farther away from the surface to be cleaned may be defined as an upward direction (upper side), and a direction closer to the surface to be cleaned may be defined as a downward direction (lower side).

[0108] Additionally, left and right sides may be defined based on when the cleaning module 100 is oriented in a forward direction. The left and right sides may be oriented in opposite directions.

[0109] The cleaner 1 according to the first embodiment of the present disclosure may include a wheel 400.

[0110] The wheel 400 may rollably move while in contact with the surface to be cleaned, and may be rotatably coupled to the cleaning module 100.

[0111] The wheel 400 may be provided in pair, and the pair of wheels may be rotatably coupled to opposite side of a lower end of the cleaning module 100, respectively. Specifically, the pair of wheels 400 may be rotatably coupled to a rear side of the cleaning module housing 110, or to the wings of the wheel support 130 extending from the rear side of the cleaning module housing 110.

[0112] At this time, a first wheel 410 of the pair of wheels 400 may rotate about a first rotation axis A1, and a second wheel 420 may rotate about a second rotation axis A2. The rotation axes A1 and A2 may not be parallel to each other. The rotation axes A1 and A2 may be placed on an imaginary plane orthogonal to a longitudinal axis of the suction tube 120.

[0113] Additionally, based on a state in which the pair of wheels 400 rollably move over the surface to be cleaned, a point where an extension line of the first rotation axis A1 and an extension line of the second rotation axis A2 intersect may be located higher than an imaginary straight line C that connects the center of the first wheel 410 and the center of the second wheel 420. That is, the pair of wheels 400 may be arranged so as to be inclined upward in opposite directions.

[0114] Specifically, the first rotation axis A1 may be inclined at an angle of +0 with respect to the imaginary straight line C. As an example, the first rotation axis A1 may be inclined at an angle of −45 degrees with respect to the imaginary straight line C. Additionally, the second rotation axis A2 may be inclined at an angle of −0 with respect to the imaginary straight line C. As an example, the second rotation axis A2 may be inclined at an angle of −45 degrees with respect to the imaginary straight line C.

[0115] Therefore, the two rotation axes A1 and A2 may intersect with each other at spaced points on the imaginary straight line C that passes through the centers of the pair of wheels 400.

[0116] Additionally, due to inclination of the first rotation axis A1 and the second rotation axis A2, a distance between the pair of wheels 400 may decrease as the wheels become farther away from the first steering part 520. That is, in a state in which the agitator 112 is in contact with the surface to be cleaned, the distance between the pair of wheels 400 may increase as the wheels become farther away from the surface to be cleaned.

[0117] Meanwhile, a surface of each of the wheels 410 and 420 that comes into contact with the surface to be cleaned (hereinafter referred to as a “contact surface”) may be formed to correspond to the surface to be cleaned. That is, contact surfaces 411 and 421 of the wheels 410 and 420 may be formed to correspond to the surface to be cleaned, thereby enabling the cleaning module 100 to travel stably. As an example, the contact surfaces 411 and 421 of the wheels 410 and 420 may have a flat shape.

[0118] Additionally, since the wheels 410 and 420 are arranged to be inclined upward in opposite directions, a cross-section of each of the wheels 410 and 420 may have a trapezoidal shape that becomes gradually wider toward the first steering part 520.

[0119] Additionally, each of the wheels 410 and 420 may have a spherical curvature. Additionally, each of the wheels 410 and 420 may have a dome shape.

[0120] Meanwhile, surfaces of the pair of wheels 400 and the pair of casters 113 that come into contact with the surface to be cleaned may be parallel to the lower surface of the cleaning module housing 110. Accordingly, even when the wheels 410 and 420 rotate about the first rotation axis A1 and the second rotation axis A2, the lower surface of the cleaning module 110 housing may be prevented from interfering with the surface to be cleaned.

[0121] With reference to FIGS. 1 to 6c, the connection tube 500 according to the first embodiment of the present disclosure will be described as follows.

[0122] The connection tube 500 may have a flow path formed therein and through which the air flows, and may physically and / or fluidically connect the cleaning module 100 and the extension tube 300 or the cleaning module 100 and the main body 200 to each other.

[0123] As an example, a first end of the connection tube 500 may be communicated with the suction tube 120 of the cleaning module 100, and a second end of the connection tube may be communicated with the extension tube 300 or the suction part 210 of the main body 200. As another example, the first end of the connection tube 500 may be communicated with the suction port 111 of the cleaning module 100, and the second end of the connection tube may be communicated with the extension tube 300 or the suction part 210 of the main body 200.

[0124] The connection tube 500 according to the first embodiment of the present disclosure may include the pipe 510, the first steering part 520, and a second steering part 530. By having the first steering part 520 and the second steering part 530, the connection tube 500 is rotatable in a rolling manner and in a pitching manner.

[0125] The pipe 510 may have a flow path formed therein and communicated with the suction port 111 or the suction tube 120. The pipe 510 may be coupled to the cleaning module housing 110 and communicated with the flow path inside the cleaning module housing 110. The pipe 510 may be made of a deformable material. Specifically, the pipe 510 may be made of a bendable material. Accordingly, the pipe 510 may be bent and deformed in response to rotation of each of the first steering part 520 and the second steering part 530 of the connection tube 500.

[0126] As an example, the pipe 510 may be disposed inside the first steering part 520 and the second steering part 530 to fluidically connect the first steering part 520 and the second steering part 530 to each other, and may serve as a flow path through which the air introduced through the suction tube 120 flows.

[0127] As another example, the pipe 510 may be disposed inside the suction tube 120, the first steering part 520, and the second steering part 530 to fluidically connect the suction tube 120, the first steering part 520, and the second steering part 530 to each other, and may serve as a flow path through which the air introduced through the suction port 111 flows.

[0128] That is, a first end of the pipe 510 may be coupled to the cleaning module 100 and a second end of the pipe may be coupled to the suction part 210 or the extension tube 300, so an air flow path defined by the suction port 111, the suction tube 120, the connection tube 500, and the extension tube 300 may be formed inside the cleaner 1.

[0129] The cleaner 1 according to the first embodiment of the present disclosure may rotate about a plurality of rotation axes for steering.

[0130] Hereinafter, the plurality of axes will be defined assuming that a direction in which the cleaning module 100 advances forward is a forward direction.

[0131] The cleaner 1 according to the first embodiment of the present disclosure may include a rolling axis X1 and a pitching axis Y1.

[0132] The rolling axis X1 refers to a central axis about which the main body 200 rotates, and may be an imaginary straight line that is disposed in a longitudinal direction of the second steering part 530. Additionally, the rolling axis X1 may coincide with an imaginary straight line that passes through the center of the cleaning module 100 and extends in a forward-rearward direction. Additionally, the rolling axis X1 may be an imaginary straight line that is disposed parallel to a protruding direction of the wheel support 130.

[0133] Hereinafter, “rolling” refers to a rotation about the rolling axis X1, and specifically, it refers to a state in which left and right ends rotate up and down about the rolling axis X1.

[0134] At this time, the rolling axis X1 may coincide with a longitudinal direction of the extension tube 300 in a state in which the second steering part 530 fully rotates downward. Additionally, the rolling axis X1 may coincide with an extending direction of the suction part 210 in a state in which the second steering part 530 fully rotates downward. Additionally, the rolling axis X1 may coincide with a center line that passes through the center of the cleaning module 100 and the center of the main body 200 in a state in which the second steering part 530 fully rotates downward. However, when the second steering part 530 rotates up and down, the rolling axis X1 may not coincide with the center line.

[0135] Additionally, the rolling axis X1 may rotate in conjunction with rotation (pitching) of the first steering part 520 about the pitching axis Y1. Therefore, whenever the first steering part 520 rotates about the pitching axis Y1, the position of the rolling axis X1 may change accordingly.

[0136] The pitching axis Y1 refers to a central axis about which the main body 200 rotates up and down, and may be an imaginary straight line that is disposed in a left-right direction of the cleaning module 100.

[0137] Hereinafter, “pitching” refers to a rotation about the pitching axis Y1, and specifically, it refers to a state in which a rear end rotates up and down about the pitching axis Y1.

[0138] The pitching axis Y1 may be disposed at a front end of the first steering part 520 or a rear end of the suction tube 120. The pitching axis Y1 may be disposed orthogonal to the rolling axis X1. The pitching axis Y1 may be parallel to a rotation axis of the agitator 112, and may be disposed parallel to the surface to be cleaned in a state in which the agitator 112 is in contact with the surface to be cleaned.

[0139] Additionally, the pitching axis Y1 may rotate in conjunction with rotation (rolling) of the first steering part 520 about the rolling axis X1. Therefore, whenever the first steering part 520 rotates about the rolling axis X1, the position of the pitching axis Y1 may change accordingly.

[0140] The first steering part 520 may be rotatably coupled to the cleaning module 100. Specifically, the first steering part 520 may be rotatably coupled to the suction tube 120.

[0141] Additionally, the first steering part 520 may have a flow path formed therein and through which the air flows. As an example, the first steering part 520 may be formed in a hollow shape so that at least a part of the pipe 510 passes therethrough. As another example, the first steering part 520 may have a space formed therein and communicated with the pipe 510. Therefore, the air flowing inside the first steering part 520 may be introduced into the second steering part 530 by the suction force of the suction motor 220.

[0142] The first steering part 520 may be disposed between the wings of wheel support 130 extending in parallel from the rear side of the cleaning module housing 110.

[0143] The first steering part 520 may be disposed between the pair of wheels 400. Specifically, the first steering part 520 may be disposed to be spaced apart a predetermined distance from the first wheel 410 and the second wheel 420.

[0144] The first steering part 520 may rotate about the rolling axis X1. The first steering part 520 may rotate relative to the suction tube 120 about the rolling axis X1. Specifically, the first steering part 520 may be hingedly coupled to the suction tube 120 with the rolling axis X1 as a center.

[0145] That is, a first end of the first steering part 520 may be rotatably coupled to the suction tube 120 and a second end of the first steering part may be rotatably coupled to the second steering part 530.

[0146] As an example, the first steering part 520 may rotate within an angular range of 0 degrees to 90 degrees about the rolling axis X1. As another example, the first steering part 520 may rotate within an angular range of 0 degrees to 180 degrees about the rolling axis X1. As still another example, the first steering part 520 may rotate within an angular range of 0 degrees to 270 degrees about the rolling axis X1. Alternatively, the first steering part 520 may be rotatable 360 degrees about the rolling axis X1.

[0147] With this configuration, in a case where the user places the cleaning module 100 on the surface to be cleaned and rotates the main body 200, when cleaning a place where the cleaning module 100 enters a narrow gap, such as a gap below a bed or furniture, the user may clean the floor surface by turning the main body 200 sideways while the user is lying face down.

[0148] Meanwhile, rotation of each of the pair of wheels 400 and rotation (rolling) of the first steering part 520 about the rolling axis X1 may be performed independently of each other.

[0149] That is, the pair of wheels 400 may rotate while attached to the cleaning module housing 110 or the wheel support 130, and the first steering part 520 may rotate while attached to the suction tube 120, so each of the pair of wheels 400 and the first steering part 520 may rotate independently without interfering with each other.

[0150] Therefore, the present disclosure has an advantage in that even when the user rotates the main body 200 and the connection tube 500 rotates thereby, each of the pair of wheels 400 does not rotate together with the connection tube 500 but remains in contact with the surface to be cleaned, thereby maintaining operability of the cleaning module 100.

[0151] Additionally, the present disclosure has another advantage in that even when the diameter of the flow path of the first steering part 520 is increased to increase the amount of air flow, the area where each of the pair of wheels 400 is in contact with the surface to be cleaned is maintained, thereby maintaining steerability of the cleaning module 100.

[0152] The second steering part 530 may be rotatably coupled to the first steering part 520.

[0153] The second steering part 530 may rotate about the pitching axis Y1. The second steering part 530 may rotate relative to the first steering part 520 about the pitching axis Y1. Specifically, the second steering part 530 may be hingedly coupled to the first steering part 520 with the pitching axis Y1 as a center.

[0154] Additionally, the second steering part 530 may be disposed between the pair of wheels 400. That is, the first steering part 520 may rotate (pitch) up and down about the pitching axis Y1 between the pair of wheels 400.

[0155] Additionally, a first end of the second steering part 530 may be rotatably coupled to the first steering part 520 and a second end of the second steering part may be detachably coupled to the extension tube 300.

[0156] As an example, the second steering part 530 may rotate within an angular range of 0 degrees to 90 degrees about the pitching axis Y1. As another example, the second steering part 530 may rotate within an angular range of 0 degrees to 180 degrees about the pitching axis Y1. As still another example, the second steering part 530 may rotate within an angular range of 0 degrees to 270 degrees about the pitching axis Y1.

[0157] Meanwhile, the second steering part 530 may have a flow path formed therein and through which the air flows. As an example, the second steering part 530 may be formed in a hollow shape so that at least a part of the pipe 510 passes therethrough. As another example, the second steering part 530 may have a space formed therein and communicated with the pipe 510. Therefore, the air flowing inside the second steering part 530 may be introduced into the extension tube 300 or the suction part 210 by the suction force of the suction motor 220.

[0158] Additionally, a direction in which the second steering part 530 rotates relative to the first steering part 520 and a direction in which the first steering part 520 rotates relative to the suction tube 120 may intersect with each other. Therefore, in the cleaner 1 according to the present disclosure, the connection tube 500 may be advantageously able to tilt at various angles by combining a rotation direction of the first steering part 520 and a rotation direction of the second steering part 530.

[0159] With this configuration, when the user places the cleaning module 100 on the surface to be cleaned and lifts or lowers the main body 200, the main body 200 and the connection tube 500 may rotate about the rolling axis X1.

[0160] Consequently, the connection tube 500 according to the present disclosure may be advantageously able to rotate through the two rotation axes X1 and Y1 and tilt at various angles, thereby facilitating user operability.

[0161] Meanwhile, the second steering part 530 may rotate about the rolling axis X1 in conjunction with rotation (rolling) of the first steering part 520. The second steering part 530 may rotate about the rolling axis X1 in conjunction with rotation (rolling) of the first steering part 520 so as to reciprocate in a left-right direction between the pair of wheels 400.

[0162] Specifically, a front end of the second steering part 530 may be hingedly coupled to a rear end of the first steering part 520, so when the first steering part 520 rotates about the rolling axis X1, the second steering part 530 may rotate together with the first steering part 520 about the rolling axis X1 that passes through the first steering part 520 in a forward-rearward direction.

[0163] Additionally, the second steering part 530 may rotate within a predetermined angular range about the rolling axis X1 in a state in which the main body 200 rotates about the pitching axis Y1 so that an extension line of a longitudinal axis of the second steering part 530 intersects an extension line of the rolling axis X1.

[0164] As an example, the predetermined angular range may be in the range of 0 degrees to 60 degrees. As another example, the predetermined angular range may be in the range of 0 degrees to 120 degrees. As still another example, the predetermined angular range may be in the range of 0 degrees to 180 degrees.

[0165] Meanwhile, the second steering part 530 may rotate to reciprocate between the pair of wheels 400. Specifically, when the second steering part 530 comes into contact with the pair of wheels 400 or the wheel support 130, the second steering part 530 may no longer rotate in a left-right direction, so a rotation range of the second steering part 530 about the rolling axis X1 may be limited between the pair of wheels 400. That is, the rotation range of the second steering part 530 may vary depending on the size, shape, or arrangement of the pair of wheels 400 or the wheel support 130.

[0166] As an example, the rotation range of the second steering part 530 may be in the range of 0 degrees to 60 degrees. As another example, the rotation range of the second steering part 530 may be in the range of 0 degrees to 90 degrees. As still another example, the rotation range of the second steering part 530 may be in the range of 0 degrees to 120 degrees.

[0167] Meanwhile, the pitching axis Y1 may be disposed between the imaginary straight line C connecting the centers of the pair of wheels 400 and the cleaning module 100. Alternatively, based on a state in which the agitator 112 is in contact with the surface to be cleaned, the pitching axis Y1 and the imaginary straight line C may be arranged on the same plane formed orthogonal to the surface to be cleaned. That is, the pitching axis Y1 may be disposed vertically parallel to the imaginary straight line C or may be disposed behind the imaginary straight line C.

[0168] This is because when the imaginary straight line C is disposed in front of the pitching axis Y1, the cleaner 1 may fall rearward due to the weight of the main body 200 in a state in which the second steering part 530 rotates upward about the pitching axis Y1. That is, when the pitching axis Y1 is disposed vertically parallel to the imaginary straight line C or is disposed behind the imaginary straight line C, the cleaner 1 may be stably supported even when the user lifts the main body 200 of the cleaner 1 upward to use it.

[0169] FIG. 7 is a perspective view illustrating a cleaner according to a second embodiment of the present disclosure. FIG. 8 is a plan view of FIG. 7. FIG. 9 is a bottom view of FIG. 7. FIG. 10 is a side view of FIG. 7. FIG. 11 is a rear view of FIG. 7.

[0170] Hereinafter, with reference to FIGS. 7 to 11, a cleaner according to a second embodiment of the present disclosure will be described as follows.

[0171] The cleaner according to the second embodiment of the present disclosure may include a cleaning module 1100, a main body 1200, an extension tube 1300, a wheel 1400, and a connection tube 1500.

[0172] To avoid redundant description, in the second embodiment, the description of the first embodiment may be used to describe configurations equivalent to those of the first embodiment. Specifically, in the second embodiment, the description of the cleaning module 100, the main body 200, the extension tube 300, the wheel 400, and the connection tube 500 according to the first embodiment of the present disclosure may be applied to the description of the cleaning module 1100, the main body 1200, the extension tube 1300, the wheel 1400, and the connection tube 1500.

[0173] Hereinafter, the configuration of the cleaner according to the second embodiment will be described focusing on the difference from the cleaner according to the first embodiment.

[0174] The second embodiment of the present disclosure is different from the first embodiment in that a second steering part 1530 rotates about a rolling axis X2 behind the cleaning module 1100 and the wheel 1400 in conjunction with rotation of a first steering part 1520.

[0175] Referring to FIG. 10, the wheel 1400 of the cleaner according to the second embodiment of the present disclosure may have a diameter that is equal to the length of the first steering part 1520 or smaller than the length of the first steering part 1520.

[0176] At this time, when the user rotates the main body 1200 about the rolling axis X2 in a state in which the second steering part 1530 fully rotates downward about a pitching axis Y2, the second steering part 1530 may not come into contact with a pair of wheels 1400 or a wheel support 1130. Therefore, when the user rotates the main body about the rolling axis X2, a rotation range of the second steering part 1530 that rotates together with the first steering part 1520 increases advantageously.

[0177] Additionally, the pitching axis Y2 of the cleaner according to the second embodiment of the present disclosure may be disposed between the pair of wheels 1400 and the cleaning module 1100 or may be disposed behind the pair of wheels 1400.

[0178] At this time, in a case where the pitching axis Y2 is disposed behind the pair of wheels 1400, when the second steering part 1530 rotates about the rolling axis X2 in a state of rotating upward about the pitching axis Y2, the second steering part 1530 may rotate about the rolling axis X1 without coming into contact with the pair of wheels 1400.

[0179] That is, the second embodiment has an advantage in that the rotation range of the second steering part 1530 about the rolling axis X2 may increase without being limited by the pair of wheels 1400 even when the second steering part 1530 rotates upward about the pitching axis Y2.

[0180] As an example, the rotation range of the second steering part 1530 may be in the range of 0 degrees to 180 degrees. As another example, the rotation range of the second steering part 1530 may be in the range of 0 degrees to 240 degrees. As still another example, the rotation range of the second steering part 1530 may be in the range of 0 degrees to 300 degrees. Alternatively, the second steering part 1530 may rotate 360 degrees about the rolling axis X2.

[0181] FIG. 12 is a perspective view illustrating a cleaner according to a third embodiment of the present disclosure. FIG. 13 is a plan view of FIG. 12. FIG. 14 is a bottom view of FIG. 12. FIG. 15 is a side view of FIG. 12. FIG. 16 is a rear view of FIG. 12.

[0182] Hereinafter, with reference to FIGS. 12 to 16, a cleaner according to a third embodiment of the present disclosure will be described as follows.

[0183] The cleaner according to the third embodiment of the present disclosure may include a cleaning module 2100, a main body 2200, an extension tube 2300, a wheel 2400, and a connection tube 2500.

[0184] To avoid redundant description, in the third embodiment, the description of the first embodiment may be used to describe configurations equivalent to those of the first embodiment. Specifically, in the third embodiment, the description of the cleaning module housing 110, the main body 200, the extension tube 300, and the wheel 400 according to the first embodiment of the present disclosure may be applied to the description of a cleaning module housing 2110, the main body 2200, the extension tube 2300, and the wheel 2400.

[0185] Hereinafter, the configuration of the cleaner according to the third embodiment will be described focusing on the difference from the cleaner according to the first embodiment.

[0186] The third embodiment of the present disclosure is different from the first embodiment in that the order of implementing rolling, yawing, and pitching of the main body 2200 according to the structure of the connection tube 2500 is different.

[0187] The cleaning module 2100 of the cleaner according to the third embodiment of the present disclosure may include a wheel support 2120.

[0188] The wheel support 2120 may be formed to extend outward from a rear side of the cleaning module housing 2110.

[0189] As an example, the wheel support 2120 may be formed to have a pair of wings provided on opposite sides thereof and extending in parallel from the rear side of cleaning module housing 2110. As another example, the wheel support 2120 may be formed to extend from the rear side of the cleaning module housing 2110, and may be disposed to surround a pipe 2510 while being spaced from an outer side of the pipe 2510.

[0190] Additionally, a first steering part 2520 may be coupled to a rear end of the wheel support 2120. Specifically, a pitching axis Y3 may be formed in a left-right direction at the rear end of the wheel support 2120, and the first steering part 2520 may rotate (pitch) about the pitching axis Y3 at the rear end of the wheel support 2120.

[0191] Meanwhile, a pair of wheels 2400 may be rotatably coupled to the wheel support 2120. At this time, the pair of wheels 2400 may be inclinedly coupled to the wings of the wheel support 2120, respectively. As an example, the pair of wheels 2400 may be coupled to the wings of the wheel support 2120, respectively, so as to be inclined upward in opposite directions.

[0192] The cleaner according to the third embodiment of the present disclosure may include the connection tube 2500.

[0193] The connection tube 2500 may have a flow path formed therein and through which the air flows, and may physically and / or fluidically connect the cleaning module 2100 and the extension tube 2300 or the cleaning module 2100 and the main body 2200 to each other.

[0194] As an example, a first end of the connection tube 2500 may be communicated with a flow path inside the cleaning module housing 2110, and a second end of the connection tube may be communicated with the extension tube 2300 or a suction part 2210 of the main body 2200. As another example, the first end of the connection tube 2500 may be communicated with a suction port 2111 of the cleaning module 2100, and the second end of the connection tube may be communicated with the extension tube 2300 or the suction part 2210 of the main body 2200.

[0195] The connection tube 2500 according to the third embodiment of the present disclosure may include the pipe 2510, the first steering part 2520, a second steering part 2530, and a third steering part 2540. By having the first steering part 2520, the second steering part 2530, and the third steering part 2540, the connection tube 2500 is rotatable in a pitching manner, in a yawing manner, and in a rolling manner.

[0196] The pipe 2510 may have a flow path formed therein and communicated with the suction port 2111 or a wheel support 2120. The pipe 2510 may be coupled to the cleaning module housing 2110 and communicated with the flow path inside the cleaning module housing 2110. The pipe 2510 may be made of a deformable material. Specifically, the pipe 2510 may be made of a bendable material. Accordingly, the pipe 2510 may be bent and deformed in response to rotation of each of the first steering part 2520, the second steering part 2530, and the third steering part 2540 of the connection tube 2500.

[0197] As an example, the pipe 2510 may be disposed inside the first steering part 2520 and the second steering part 2530 to fluidically connect the first steering part 2520 and the second steering part 2530 to each other, and may serve as a flow path through which the air introduced through the suction port 2111 flows.

[0198] That is, a first end of the pipe 2510 may be coupled to the cleaning module 2100 and a second end of the pipe may be coupled to the suction part 2210 or the extension tube 2300, so an air flow path defined by the suction port 2111, the connection tube 2500, and the extension tube 2300 may be formed inside the cleaner.

[0199] The cleaner according to the third embodiment of the present disclosure may rotate about a plurality of rotation axes for steering.

[0200] Hereinafter, the plurality of axes will be defined assuming that a direction in which the cleaning module 2100 advances forward is a forward direction.

[0201] The cleaner according to the third embodiment of the present disclosure may include a rolling axis X3, a pitching axis Y3, and a yawing axis Z3.

[0202] The rolling axis X3 refers to a central axis about which the main body 2200 rotates, and may be an imaginary straight line that is disposed in a longitudinal direction of the third steering part 2540. Additionally, the rolling axis X3 may coincide with an imaginary straight line that passes through the center of the cleaning module 2100 and extends in a forward-rearward direction. Additionally, the rolling axis X3 may be an imaginary straight line that is disposed parallel to a protruding direction of the wheel support 2120.

[0203] Hereinafter, “rolling” refers to a rotation about the rolling axis X3, and specifically, it refers to a state in which left and right ends rotate up and down about the rolling axis X3.

[0204] At this time, the rolling axis X3 may coincide with a longitudinal direction of the extension tube 2300. Additionally, the rolling axis X3 may coincide with an extending direction of the suction part 2210. Additionally, the rolling axis X3 may coincide with a center line that passes through the center of the cleaning module 2100 and the center of the main body 2200 in a state in which the first steering part 2520 fully rotates downward about the pitching axis Y3. However, when the first steering part 2520 rotates (pitches) about the pitching axis Y3 or the second steering part 2530 rotates (yaws) about the yawing axis Z3, the rolling axis X3 may not coincide with the center line.

[0205] Additionally, the rolling axis X3 may rotate in conjunction with rotation (pitching) of the first steering part 2520 about the pitching axis Y3 and / or rotation (yawing) of the second steering part 2530 about the yawing axis Z3.

[0206] The pitching axis Y3 refers to a central axis about which the main body 2200 rotates up and down, and may be an imaginary straight line that is disposed in a left-right direction of the cleaning module 2100. The pitching axis Y3 may be disposed behind the cleaning module 2100, and may be parallel to an imaginary straight line that passes through the centers of the pair of wheels 2400.

[0207] Hereinafter, “pitching” refers to a rotation about the pitching axis Y3, and specifically, it refers to a state in which a rear end rotates up and down about the pitching axis Y3.

[0208] The pitching axis Y3 may be disposed to pass through opposite sides of the first steering part 2520. The pitching axis Y3 may be disposed orthogonal to the rolling axis X3. The pitching axis Y3 may be parallel to a rotation axis of an agitator 2112, and may be disposed parallel to the surface to be cleaned in a state in which the agitator 2112 is in contact with the surface to be cleaned.

[0209] The yawing axis Z3 refers to a central axis about which the main body 2200 rotates left and right, and may be an imaginary straight line that is disposed in an up-down direction. The yawing axis Z3 may be orthogonal to both the rolling axis X3 and the pitching axis Y3. The yawing axis Z3 may change in position in conjunction with rotation (pitching) of the first steering part 2520 about the pitching axis Y3.

[0210] Hereinafter, “yawing” refers to a rotation about the yawing axis Z3, and specifically, it refers to a state in which left and right ends rotate forward and rearward about the yawing axis Z3.

[0211] The yawing axis Z3 may be formed to pass through the second steering part 2530. Specifically, the yawing axis Z3 may be formed in an up-down direction at a front end of the second steering part 2530, and the second steering part 2530 may rotate relative to the first steering part 2520 about the yawing axis Z3. Additionally, the yawing axis Z3 may change in position in conjunction with rotation (pitching) of the first steering part 2520 about the pitching axis Y3.

[0212] The first steering part 2520 may be rotatably coupled to the cleaning module 2100. Specifically, the first steering part 2520 may be rotatably coupled to the wheel support 2120.

[0213] Additionally, the first steering part 2520 may be disposed between the wings of the wheel support 2120 extending in parallel from the rear side of the cleaning module housing 2110.

[0214] The first steering part 2520 may rotate about the pitching axis Y3. The first steering part 2520 may rotate relative to the wheel support 2120 about the pitching axis Y3. Specifically, the first steering part 2520 may be hingedly coupled to the wheel support 2120 with the pitching axis Y3 as a center.

[0215] Additionally, a first end of the first steering part 2520 may be rotatably coupled to the wheel support 2120 and a second end of the first steering part may be rotatably coupled to the second steering part 2530.

[0216] As an example, the first steering part 2520 may rotate within an angular range of 0 degrees to 90 degrees about the pitching axis Y3. As another example, the first steering part 2520 may rotate within an angular range of 0 degrees to 180 degrees about the pitching axis Y3. As still another example, the first steering part 2520 may rotate within an angular range of 0 degrees to 270 degrees about the pitching axis Y3.

[0217] With this configuration, when the user places the cleaning module 2100 on the surface to be cleaned and lifts or lowers the main body 2200, the main body 2200 and the connection tube 2500 may rotate about the pitching axis Y3.

[0218] Additionally, the first steering part 2520 may have a flow path formed therein and through which the air flows. As an example, the first steering part 2520 may be formed in a hollow shape so that at least a part of the pipe 2510 passes therethrough. As another example, the first steering part 2520 may have a space formed therein and communicated with the pipe 2510. Therefore, the air flowing inside the first steering part 2520 may be introduced into the second steering part 2530 by a suction force of a suction motor 2220.

[0219] The first steering part 2520 may be disposed between the pair of wheels 2400. That is, the first steering part 2520 may rotate (pitch) up and down about the pitching axis Y3 between the pair of wheels 2400.

[0220] Meanwhile, rotation of each of the pair of wheels 2400 and rotation (pitching) of the first steering part 2520 about the pitching axis Y3 may be performed independently of each other.

[0221] That is, the pair of wheels 2400 may be rotatably coupled to outer sides of the wings of the wheel support 2120, and the first steering part 2520 may be rotatably coupled to an inner side of the wheel support 2120, so each of the pair of wheels 2400 and the first steering part 2520 rotate independently without interfering with each other.

[0222] Therefore, the present disclosure has an advantage in that even when the user rotates the main body 2200 and the connection tube 2500 rotates thereby, each of the pair of wheels 2400 does not rotate together with the connection tube 2500 but remains in contact with the surface to be cleaned, thereby maintaining operability of the cleaning module 2100.

[0223] Additionally, the present disclosure has another advantage in that even when the diameter of the flow path of the first steering part 2520 is increased to increase the amount of air flow, the area where each of the pair of wheels 2400 is in contact with the surface to be cleaned is maintained, thereby maintaining steerability of the cleaning module 2100.

[0224] The second steering part 2530 may be rotatably coupled to the first steering part 2520.

[0225] The second steering part 2530 may rotate about the yawing axis Z3. The second steering part 2530 may rotate relative to the first steering part 2520 about the yawing axis Z3. Specifically, the second steering part 2530 may be hingedly coupled to the first steering part 2520, and the second steering part 2530 may rotate (yaw) left and right about the yawing axis Z3.

[0226] Additionally, the second steering part 2530 may rotate within a predetermined angular range about the yawing axis Z3 relative to the first steering part 2520.

[0227] As an example, the predetermined angular range may be in the range of 0 degrees to 60 degrees. As another example, the predetermined angular range may be in the range of 0 degrees to 120 degrees. As still another example, the predetermined angular range may be in the range of 0 degrees to 180 degrees.

[0228] With this configuration, in a case where the user places the cleaning module 2100 on the surface to be cleaned and rotates the main body 2200, when cleaning a place where the cleaning module 2100 enters a narrow gap, such as a gap below a bed or furniture, the user may clean the floor surface by turning the main body 2200 sideways while the user is lying face down.

[0229] Additionally, a first end of the second steering part 2530 may be rotatably coupled to the first steering part 2520 and a second end of the second steering part may be rotatably coupled to the third steering part 2540.

[0230] Meanwhile, the second steering part 2530 may have a flow path formed therein and through which the air flows. As an example, the second steering part 2530 may be formed in a hollow shape so that at least a part of the pipe 2510 passes therethrough. As another example, the second steering part 2530 may have a space communicated with the pipe 2510. Therefore, the air flowing inside the second steering part 2530 may be introduced into the extension tube 2300 or the suction part 2210 by the suction force of the suction motor 2220.

[0231] A direction in which the second steering part 2530 rotates relative to the first steering part 2520 and a direction in which the first steering part 2520 rotates relative to the wheel support 2120 may intersect with each other. Additionally, a direction in which the second steering part 2530 rotates relative to the first steering part 2520 and a direction in which the third steering part 2540 rotates relative to the second steering part 2530 may intersect with each other. Therefore, in the cleaner according to the present disclosure, the connection tube 2500 may be advantageously able to tilt at various angles by combining a rotation direction of the first steering part 2520, a rotation direction of the second steering part 2530, and a rotation direction of the third steering part 2540.

[0232] Meanwhile, the pair of wheels 2400 may be coupled to the outer sides of the wings of the wheel support 2120, the first steering part 2520 may be disposed between the wings of the wheel support 2120, and the second steering part 2530 may rotate about the yawing axis Z3 relative to the first steering part 2520. Accordingly, the second steering part 2530 may rotate (yaw) about the yawing axis Z3 so as to reciprocate between the pair of wheels 2400.

[0233] Additionally, the second steering part 2530 may rotate about the pitching axis Y3 in conjunction with rotation (pitching) of the first steering part 2520. That is, when the first steering part 2520 rotates about the pitching axis Y3, the second steering part 2530 hingedly coupled to the first steering part 2520 may rotate together with the first steering part 2520 about the pitching axis Y3 disposed in a left-right direction.

[0234] As an example, the second steering part 2530 may rotate within an angular range of 0 degrees to 60 degrees about the yawing axis Z3. As another example, the second steering part 2530 may rotate within an angular range of 0 degrees to 120 degrees about the yawing axis Z3. As still another example, the second steering part 2530 may rotate within an angular range of 0 degrees to 180 degrees about the yawing axis Z3.

[0235] The third steering part 2540 may be rotatably coupled to the second steering part 2530.

[0236] Additionally, the third steering part 2540 may be formed in a similar shape to a tube, and a first inner surface of the third steering part 2540 may be coupled to receive a second end of the second steering part 2530. At this time, a step may be formed on the second end of the second steering part 2530 to prevent separation of the second steering part 2530 and the third steering part 2540.

[0237] The third steering part 2540 may rotate about the rolling axis X3. Specifically, the third steering part 2540 may be hingedly coupled to the second steering part 2530, and the third steering part 2540 may rotate relative to the second steering part 2530 about the rolling axis X3. At this time, the rolling axis X3 may be orthogonal to the directions of the pitching axis Y3 and the yawing axis Z3.

[0238] That is, a first end of the third steering part 2540 may be rotatably coupled to the second steering part 2530 and a second end of the third steering part may be detachably coupled to the extension tube 2300 or the suction part 2210.

[0239] As an example, the third steering part 2540 may rotate within an angular range of 0 degrees to 90 degrees about the rolling axis X3. As another example, the third steering part 2540 may rotate within an angular range of 0 degrees to 180 degrees about the rolling axis X3. As still another example, the third steering part 2540 may rotate within an angular range of 0 degrees to 270 degrees about the rolling axis X3. Alternatively, the third steering part 2540 may rotate 360 degrees about the rolling axis X3.

[0240] With this configuration, in a case where the user places the cleaning module 2100 on the surface to be cleaned and rotates the main body 2200, when cleaning a place where the cleaning module 2100 enters a narrow gap, such as a gap below a bed or furniture, the user may clean the floor surface by turning the main body 2200 sideways while the user is lying face down.

[0241] Consequently, the connection tube 2500 according to the present disclosure may be advantageously able to rotate through the three rotation axes X3, Y3, and Z3 and tilt at various angles, thereby facilitating user operability.

[0242] Additionally, the first end of the third steering part 2540 may be rotatably coupled to the second steering part 2530 and the second end of the third steering part 2540 may be detachably coupled to the extension tube 2300 or the main body 2200.

[0243] Meanwhile, the third steering part 2540 may have a flow path formed therein and through which the air flows. As an example, the third steering part 2540 may be formed in a hollow shape so that at least a part of the pipe 2510 passes therethrough. As another example, the third steering part 2540 may have a space formed therein and communicated with the pipe 2510.

[0244] FIG. 17 is a perspective view illustrating a cleaner according to a fourth embodiment of the present disclosure. FIG. 18 is a plan view of FIG. 17. FIG. 19 is a bottom view of FIG. 17. FIG. 20 is a side view of FIG. 17. FIG. 21 is a rear view of FIG. 17.

[0245] Hereinafter, with reference to FIGS. 17 to 21, a cleaner according to a fourth embodiment of the present disclosure will be described as follows.

[0246] The cleaner according to the fourth embodiment of the present disclosure may include a cleaning module 3100, a main body 3200, an extension tube 3300, a wheel 3400, and a connection tube 3500.

[0247] To avoid redundant description, in the fourth embodiment, the description of the first embodiment may be used to describe configurations equivalent to those of the first embodiment. Specifically, in the fourth embodiment, the description of the cleaning module housing 110, the main body 200, the extension tube 300, and the wheel 400 according to the first embodiment of the present disclosure may be applied to the description of a cleaning module housing 3110, the main body 3200, the extension tube 3300, and the wheel 3400.

[0248] Hereinafter, the configuration of the cleaner according to the fourth embodiment will be described focusing on the difference from the cleaner according to the first embodiment.

[0249] The fourth embodiment of the present disclosure is different from the first embodiment in that the arrangement of a rolling axis X4 is different, and the order of implementing rolling and yawing of the main body 3200 according to the structure of the connection tube 3500 is different.

[0250] The cleaning module 3100 of the cleaner according to the fourth embodiment of the present disclosure may include a wheel support 3120.

[0251] The wheel support 3120 may be formed to extend outward from a rear side of the cleaning module housing 3110.

[0252] As an example, the wheel support 3120 may be formed to have a pair of wings provided on opposite sides thereof and extending in parallel from the rear side of cleaning module housing 3110. As another example, the wheel support 3120 may be formed to extend from the rear side of the cleaning module housing 3110, and may be disposed to surround a pipe 3510 while being spaced from an outer side of the pipe 3510.

[0253] Additionally, a first steering part 3520 may be coupled to a rear end of the wheel support 3120. Specifically, a pitching axis Y4 may be formed in a left-right direction at the rear end of the wheel support 3120, and the first steering part 3520 may rotate (pitch) about the pitching axis Y4 at the rear end of the wheel support 3120.

[0254] Meanwhile, a pair of wheels 3400 may be rotatably coupled to the wheel support 3120. At this time, the pair of wheels 3400 may be inclinedly coupled to the wings of the wheel support 3120, respectively. As an example, the pair of wheels 3400 may be coupled to the wings of the wheel support 3120, respectively, so as to be inclined upward in opposite directions.

[0255] The cleaner according to the fourth embodiment of the present disclosure may include the connection tube 3500. The connection tube 3500 may have a flow path formed therein and through which the air flows, and may physically and / or fluidically connect the cleaning module 3100 and the extension tube 3300 or the cleaning module 3100 and the main body 3200 to each other.

[0256] As an example, a first end of the connection tube 3500 may be communicated with a flow path inside the cleaning module housing 3110, and a second end of the connection tube may be communicated with the extension tube 3300 or a suction part 3210 of the main body 3200. As another example, the first end of the connection tube 3500 may be communicated with a suction port 3111 of the cleaning module 3100, and the second end of the connection tube may be communicated with the extension tube 3300 or the suction part 3210 of the main body 3200.

[0257] The connection tube 3500 according to the fourth embodiment of the present disclosure may include the pipe 3510, the first steering part 3520, and a second steering part 3530. By having the first steering part 3520 and the second steering part 3530, the connection tube 3500 is rotatable in a pitching manner, in a yawing manner, and in a rolling manner.

[0258] The pipe 3510 may have a flow path formed therein and communicated with the suction port 3111 or a suction tube 3120. The pipe 3510 may be coupled to the cleaning module housing 3110 and communicated with the flow path inside the cleaning module housing 3110. The pipe 3510 may be made of a deformable material. Specifically, the pipe 3510 may be made of a bendable material. Accordingly, the pipe 3510 may be bent and deformed in response to rotation of each of the first steering part 3520 and the second steering part 3530 of the connection tube 3500.

[0259] As an example, the pipe 3510 may be disposed inside the first steering part 3520 and the second steering part 3530 to fluidically connect the first steering part 3520 and the second steering part 3530 to each other, and may serve as a flow path through which the air introduced through the suction port 3111 flows.

[0260] That is, a first end of the pipe 3510 may be coupled to the cleaning module 3100 and a second end of the pipe may be coupled to the suction part 3210 or the extension tube 3300, so an air flow path defined by the suction port 3111, the connection tube 3500, and the extension tube 3300 may be formed inside the cleaner.

[0261] The cleaner according to the fourth embodiment of the present disclosure may rotate about a plurality of rotation axes for steering.

[0262] Hereinafter, the plurality of axes will be defined assuming that a direction in which the cleaning module 3100 advances forward is a forward direction.

[0263] The cleaner according to the fourth embodiment of the present disclosure may include the rolling axis X4 and the pitching axis Y4.

[0264] The rolling axis X4 refers to a central axis about which the main body 3200 rotates, and may be an imaginary straight line that is disposed in a longitudinal direction of the first steering part 3520. Additionally, the rolling axis X4 may coincide with an imaginary straight line that passes through the center of the cleaning module 3100 and extends in a forward-rearward direction. Additionally, the rolling axis X4 may be an imaginary straight line that is disposed parallel to a protruding direction of the wheel support 3120.

[0265] Hereinafter, “rolling” refers to a rotation about the rolling axis X4, and specifically, it refers to a state in which left and right ends rotate up and down about the rolling axis X4.

[0266] At this time, the rolling axis X4 may intersect a longitudinal direction of the extension tube 3300. Additionally, the rolling axis X4 may intersect an extending direction of the suction part 3210. Additionally, the rolling axis X4 may intersect a center line that passes through the center of the cleaning module 3100 and the center of the main body 3200 in a state in which the first steering part 3520 fully rotates downward about the pitching axis Y4. However, when the first steering part 3520 rotates (pitches) about the pitching axis Y4, the rolling axis X4 may not intersect the center line.

[0267] Additionally, the rolling axis X4 may rotate in conjunction with rotation (pitching) of the first steering part 3520 about the pitching axis Y4. Therefore, whenever the first steering part 3520 rotates about the pitching axis Y4, the position of the rolling axis X4 may change accordingly.

[0268] The pitching axis Y4 refers to a central axis about which the main body 3200 rotates up and down, and may be an imaginary straight line that is disposed in a left-right direction of the first steering part 3520. The pitching axis Y4 may be disposed behind the cleaning module 3100, and may be parallel to an imaginary straight line that passes through the centers of the pair of wheels 3400.

[0269] Hereinafter, “pitching” refers to a rotation about the pitching axis Y4, and specifically, it refers to a state in which a rear end rotates up and down about the pitching axis Y4.

[0270] The pitching axis Y4 may be disposed to pass through opposite sides of the first steering part 3520. The pitching axis Y4 may be disposed to pass through the wings of the wheel support 3120. The pitching axis Y4 may be disposed orthogonal to the rolling axis X4. The pitching axis Y4 may be parallel to a rotation axis of an agitator 3112, and may be disposed parallel to the surface to be cleaned in a state in which the agitator 3112 is in contact with the surface to be cleaned.

[0271] The first steering part 3520 may be rotatably coupled to the cleaning module 3100.

[0272] Specifically, the first steering part 3520 may be rotatably coupled to the wheel support 3120.

[0273] Additionally, the first steering part 3520 may be disposed between the wings of the wheel support 3120 extending in parallel from the rear side of the cleaning module housing 3110.

[0274] The first steering part 3520 may rotate about the pitching axis Y4. The first steering part 3520 may rotate relative to the wheel support 3120 about the pitching axis Y4. Specifically, the first steering part 3520 may be hingedly coupled to the wheel support 3120.

[0275] Additionally, a first end of the first steering part 3520 may be rotatably coupled to the wheel support 3120 and a second end of the first steering part may be rotatably coupled to the second steering part 3530.

[0276] As an example, the first steering part 3520 may rotate within an angular range of 0 degrees to 90 degrees about the pitching axis Y4. As another example, the first steering part 3520 may rotate within an angular range of 0 degrees to 180 degrees about the pitching axis Y4. As still another example, the first steering part 3520 may rotate within an angular range of 0 degrees to 270 degrees about the pitching axis Y4.

[0277] With this configuration, when the user places the cleaning module 3100 on the surface to be cleaned and lifts or lowers the main body 3200, the main body 3200 and the connection tube 3500 may rotate about the pitching axis Y4. Additionally, the first steering part 3520 may have a flow path formed therein and through which the air flows.

[0278] As an example, the first steering part 3520 may be formed in a hollow shape so that at least a part of the pipe 3510 passes therethrough. As another example, the first steering part 3520 may have a space formed therein and communicated with the pipe 3510. Therefore, the air flowing inside the first steering part 3520 may be introduced into the second steering part 3530 by a suction force of a suction motor 3220.

[0279] Meanwhile, first steering part 3520 may be disposed between the pair of wheels 3400. That is, the first steering part 3520 may rotate (pitch) up and down about the pitching axis Y4 between the pair of wheels 3400.

[0280] Additionally, rotation of each of the pair of wheels 3400 and rotation (pitching) of the first steering part 3520 about the pitching axis Y4 may be performed independently of each other.

[0281] That is, the pair of wheels 3400 may be rotatably coupled to outer sides of the wings of the wheel support 3120, and the first steering part 3520 may be rotatably coupled to an inner side of the wheel support 3120, so each of the pair of wheels 3400 and the first steering part 3520 may rotate independently without interfering with each other.

[0282] Therefore, the present disclosure has an advantage in that even when the user rotates the main body 3200 and the connection tube 3500 rotates thereby, each of the pair of wheels 3400 does not rotate together with the connection tube 3500 but remains in contact with the surface to be cleaned, thereby maintaining operability of the cleaning module 3100.

[0283] Additionally, the present disclosure has another advantage in that even when the diameter of the flow path of the first steering part 3520 is increased to increase the amount of air flow, the area where each of the pair of wheels 3400 is in contact with the surface to be cleaned is maintained, thereby maintaining steerability of the cleaning module 3100.

[0284] The second steering part 3530 may be rotatably coupled to the first steering part 3520.

[0285] The second steering part 3530 may rotate about the rolling axis X4. Specifically, the second steering part 3530 may be hingedly coupled to the first steering part 3520, and may rotate relative to the first steering part 3520 about the rolling axis X4.

[0286] Additionally, the second steering part 3530 may rotate within a predetermined angular range about the rolling axis X4 relative to the first steering part 3520.

[0287] That is, a first end of the second steering part 3530 may be rotatably coupled to the first steering part 3520 and a second end of the second steering part may be detachably coupled to the extension tube 3300 or the suction part 3210.

[0288] As an example, the second steering part 3530 may rotate within an angular range of 0 degrees to 90 degrees about the rolling axis X4. As another example, the second steering part 3530 may rotate within an angular range of 0 degrees to 180 degrees about the rolling axis X4. As still another example, the second steering part 3530 may rotate within an angular range of 0 degrees to 270 degrees about the rolling axis X4. Alternatively, the second steering part 3530 may rotate 360 degrees about the rolling axis X4. With this configuration, in a case where the user places the cleaning module 3100 on the surface to be cleaned and rotates the main body 3200, when cleaning a place where the cleaning module 3100 enters a narrow gap, such as a gap below a bed or furniture, the user may clean the floor surface by turning the main body 3200 sideways while the user is lying face down.

[0289] Meanwhile, the second steering part 3530 may have a flow path formed therein and through which the air flows. As an example, the second steering part 3530 may be formed in a hollow shape so that at least a part of the pipe 3510 passes therethrough. As another example, the second steering part 3530 may have a space formed therein and communicated with the pipe 3510. Therefore, the air flowing inside the second steering part 3530 may be introduced into the extension tube 3300 or the suction part 3210 by the suction force of the suction motor 3220.

[0290] Additionally, a direction in which the second steering part 3530 rotates relative to the first steering part 3520 and a direction in which the first steering part 3520 rotates relative to the wheel support 3120 may intersect with each other. Therefore, in the cleaner according to the present disclosure, the connection tube 3500 may be advantageously able to tilt at various angles by combining a rotation direction of the first steering part 3520 and a rotation direction of the second steering part 3530.

[0291] Meanwhile, based on a state in which the pair of wheels 3400 rollably move over the surface to be cleaned, the second steering part 3530 may be bent at an end of the first steering part 3520 in a direction farther away from the surface to be cleaned. Specifically, the second steering part 3530 may be bent upward and rearward in a state in which the agitator 3112 is in contact with the surface to be cleaned. With this configuration, the user may more easily grip a handle located at the top of the main body.

[0292] Additionally, the second steering part 3530 may be disposed behind the cleaning module 3100 and the pair of wheels 3400. Therefore, the second steering part 3530 may rotate at the rearmost position about the rolling axis X4, and thus may rotate 360 degrees without coming into contact with the wheel support 3120 or the wheels 3400.

[0293] Meanwhile, the second steering part 3530 may rotate about the pitching axis Y4 in conjunction with rotation (pitching) of the first steering part 3520. That is, when the first steering part 3520 rotates about the pitching axis Y4, the second steering part 3530 hingedly coupled to the first steering part 3520 may rotate together with the first steering part 3520 about the pitching axis Y4 disposed in a left-right direction.

[0294] As an example, the second steering part 3530 may rotate within an angular range of 0 degrees to 60 degrees about the pitching axis Y4. As another example, the second steering part 3530 may rotate within an angular range of 0 degrees to 120 degrees about the pitching axis Y4. As still another example, the second steering part 530 may rotate within an angular range of 0 degrees to 180 degrees about the pitching axis Y4.

[0295] Consequently, the connection tube 3500 according to the present disclosure may be advantageously able to rotate through the two rotation axes X4 and Y4 and tilt at various angles, thereby facilitating user operability.

[0296] Although preferred embodiments have been illustrated and described above, the present disclosure is not limited to the aforementioned specific embodiments. It is obvious to those skilled in the art that various modifications and changes can be made thereto without departing from the spirit and scope of the present disclosure as set forth in the appended claims, and such modifications and changes should not be understood individually from the technical spirit or prospect of the present disclosure.

Claims

1. A cleaner, comprising:a cleaning module configured to suck in outside air;a main body configured to provide a suction force to the cleaning module;a first steering part rotatably coupled to the cleaning module and configured to rotate the main body about a rolling axis disposed in a forward-rearward direction;a second steering part rotatably coupled to the first steering part and configured to rotate the main body about a pitching axis disposed in a left-right direction; anda pair of wheels rotatably coupled to the cleaning module and configured to rollably move while in contact with a surface to be cleaned,wherein, based on a state in which the pair of wheels rollably move over the surface to be cleaned, a point where extension lines of rotation axes of the wheels intersect is located higher than an imaginary straight line that connects centers of the wheels, andthe second steering part rotates about the rolling axis in conjunction with rotation of the first steering part so as to reciprocate between the pair of wheels.

2. A cleaner, comprising:a cleaning module configured to suck in outside air;a main body configured to provide a suction force to the cleaning module;a first steering part rotatably coupled to the cleaning module and configured to roll the main body;a second steering part rotatably coupled to the first steering part and configured to pitch the main body; anda pair of wheels rotatably coupled to the cleaning module and configured to rollably move while in contact with a surface to be cleaned,wherein, based on a state in which the pair of wheels rollably move over the surface to be cleaned, a point where extension lines of rotation axes of the wheels intersect is located higher than an imaginary straight line that connects centers of the wheels, andthe second steering part rotates about a longitudinal axis of the first steering part in conjunction with rolling of the first steering part so as to reciprocate between the pair of wheels.

3. The cleaner of claim 1, wherein a surface of each of the pair of wheels that comes into contact with the surface to be cleaned is formed to correspond to the surface to be cleaned.

4. The cleaner of claim 1, wherein rotation of each of the pair of wheels and rotation of the first steering part about the rolling axis are performed independent of each other.

5. The cleaner of claim 1, wherein the second steering part rotates within a predetermined angular range about the rolling axis in a state in which the main body rotates about the pitching axis so that an extension line of a longitudinal axis of the second steering part intersects an extension line of the rolling axis.

6. The cleaner of claim 1, wherein the pitching axis is disposed between the imaginary straight line connecting the centers of the pair of wheels and the cleaning module.

7. The cleaner of claim 2, wherein rotation of each of the pair of wheels and rolling of the first steering part are performed independently of each other.

8. The cleaner of claim 1, wherein the surface to be cleaned is a carpet.

9. The cleaner of 2claim 1, wherein the pair of wheels are arranged to be inclined upward in opposite directions.

10. The cleaner of claim 1, wherein a distance between the pair of wheels increases as the wheels become farther away from the surface to be cleaned.

11. The cleaner of claim 1, wherein each of the pair of wheels has a dome shape.

12. The cleaner of claim 1, wherein each of the pair of wheels has a surface of spherical curvature.

13. The cleaner of claim 1, wherein each of the pair of wheels has a trapezoidal-shaped cross-section.

14. A cleaner, comprising:a cleaning module configured to suck in outside air;a main body configured to provide a suction force to the cleaning module;a first steering part rotatably coupled to the cleaning module and configured to rotate the main body about a rolling axis disposed in a forward-rearward direction;a second steering part rotatably coupled to the first steering part and configured to rotate the main body about a pitching axis disposed in a left-right direction; anda pair of wheels rotatably coupled to the cleaning module and configured to rollably move while in contact with a surface to be cleaned,wherein, based on a state in which the pair of wheels rollably move over the surface to be cleaned, a point where extension lines of rotation axes of the wheels intersect is located higher than an imaginary straight line that connects centers of the wheels, andthe second steering part rotates about the rolling axis behind the cleaning module and the pair of wheels in conjunction with rotation of the first steering part.

15. The cleaner of claim 14, wherein a surface of each of the pair of wheels that comes into contact with the surface to be cleaned is formed to correspond to the surface to be cleaned.

16. A cleaner, comprising:a cleaning module configured to suck in outside air;a main body configured to provide a suction force to the cleaning module;a first steering part rotatably coupled to the cleaning module and configured to rotate the main body about a pitching axis disposed in a left-right direction;a second steering part rotatably coupled to the first steering part and configured to rotate the main body about a yawing axis disposed in an up-down direction;a third steering part rotatably coupled to the second steering part and configured to rotate the main body about a rolling axis disposed in a forward-rearward direction; anda pair of wheels rotatably coupled to the cleaning module and configured to rollably move while in contact with a surface to be cleaned,wherein, based on a state in which the pair of wheels rollably move over the surface to be cleaned, a point where extension lines of rotation axes of the wheels intersect is located higher than an imaginary straight line that connects centers of the wheels, andthe second steering part rotates about the yawing axis so as to reciprocate between the pair of wheels.

17. The cleaner of claim 16, wherein a surface of each of the pair of wheels that comes into contact with the surface to be cleaned is formed to correspond to the surface to be cleaned.

18. A cleaner, comprising:a cleaning module configured to suck in outside air;a main body configured to provide a suction force to the cleaning module;a first steering part rotatably coupled to the cleaning module and configured to rotate the main body about a pitching axis disposed in a left-right direction;a second steering part rotatably coupled to the first steering part and configured to rotate the main body about a rolling axis disposed in a forward-rearward direction; anda pair of wheels rotatably coupled to the cleaning module and configured to rollably move while in contact with a surface to be cleaned,wherein, based on a state in which the pair of wheels rollably move over the surface to be cleaned, a point where extension lines of rotation axes of the wheels intersect is located higher than an imaginary straight line that connects centers of the wheels, andthe pair of wheels are spaced apart from each other with the first steering part interposed therebetween.

19. The cleaner of claim 18, wherein a surface of each of the pair of wheels that comes into contact with the surface to be cleaned is formed to correspond to the surface to be cleaned.

20. The cleaner of claim 18, wherein the second steering part is disposed behind the cleaning module and the pair of wheels.

21. The cleaner of claim 18, wherein based on a state in which the pair of wheels rollably move over the surface to be cleaned, the second steering part is bent at an end of the first steering part in a direction farther away from the surface to be cleaned.

Images