Patent ID: 12197243

DETAILED DESCRIPTION

Description will now be given in detail according to exemplary embodiments disclosed herein, with reference to the accompanying drawings. For the sake of brief description with reference to the drawings, the same or equivalent components may be denoted by the same reference numbers, and description thereof will not be repeated.

In general, suffixes such as “module” and “unit” may be used to refer to elements or components. Use of such suffixes herein is merely intended to facilitate description of the specification, and the suffixes do not have any special meaning or function.

In the present disclosure, that which is well known to one of ordinary skill in the relevant art has generally been omitted for the sake of brevity. The accompanying drawings are used to assist in easy understanding of various technical features and it should be understood that the embodiments presented herein are not limited by the accompanying drawings. As such, the present disclosure should be construed to extend to any alterations, equivalents and substitutes in addition to those which are particularly set out in the accompanying drawings.

It will be understood that although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

It will be understood that when an element is referred to as being “connected with” another element, there may be intervening elements present. In contrast, it will be understood that when an element is referred to as being “directly connected with” another element, there are no intervening elements present.

A singular representation may include a plural representation unless context clearly indicates otherwise.

In the present application, it should be understood that the terms “comprises,” “includes,” “has,” etc. specify the presence of features, numbers, steps, operations, elements, components, or combinations thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

In the embodiments illustrated in the figures, representations of directions, such as up (U), down (D), left (Le), right (Ri), front (F), and rear (R) are merely for convenience of explanation, and are not intended to limit the technical features disclosed in this specification.

Referring toFIG.1, a display device1may include a head10. The head10may display images. The head10may be referred to as a display10or a display unit10.

The head10may include a first long side LS1, a second long side LS2opposite to the first long side LS1, a first short side SS1adjacent to the first long side LS1and the second long side LS2, and a second short side SS2opposite to the first short side SS1. For convenience of explanation, it is illustrated and described that the first and second long sides LS1and LS2are longer than the first and second short sides SS1and SS2, but it is also possible that lengths of the first and second long sides LS1and LS2may be approximately equal to lengths of the first and second short sides SS1and SS2.

A direction parallel to the short sides SS1and SS2of the head10may be referred to as a first direction DR1or an up-down direction. A direction parallel to the long sides LS1and LS2of the head10may be referred to as a second direction DR2or a left-right direction. A direction perpendicular to the long sides LS1and LS2and the short sides SS1and SS2of the head10may be referred to as a third direction DR3or a front-rear direction.

A side on which the head10displays an image may be referred to as a front side F, z, and a side opposite thereto may be referred to as a rear side R. The first short side SS1may be referred to as a left side Le, x, and the second short side SS2may be referred to as a right side Ri. The first long side LS1may be referred to as an upper side U, y, and the second ling side LS2may be referred to as a lower side D.

The first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2may be referred to as edges of the head10. Further, positions where the first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2meet each other may be referred to as corners.

A position where the first short side SS1and the first long side LS1meet each other may be referred to as a first corner C1. A position where the first short side SS1and the second long side LS2meet each other may be referred to as a second corner C2. A position where the second short side SS2and the second long side LS2meet each other may be referred to as a third corner C2. A position where the second short side SS2and the first long side LS1meet each other may be referred to as a fourth corner C4.

Referring toFIGS.1and2, the display device1may include a base20, a pole30, and a motion module MM.

The base20may have a generally flat cylindrical shape. The base20may be placed on the ground.

The pole30may be elongated vertically. A lower end of the pole30may be coupled onto the base20. The pole30may be adjacent to a circumference of an upper surface of the base20. A handle39may be coupled to an upper end of the pole30. The pole30and the aforementioned base20may be collectively referred to as a stand.

The motion module MM may extend in a direction crossing the pole30. A first side of the motion module MM may be coupled to a rear side of the head10. A second side of the motion module MM may be adjacent to the upper end of the pole and may be coupled to the pole30. An articulated connector40may be coupled to the rear side of the head10, an elevating module60may be coupled to the pole30, and an arm50may connect the articulated connector40and the elevating module60.

Accordingly, the head10may be supported by the motion module MM, the pole30, and the base20, and may be spaced upward from the ground.

Referring toFIGS.2and3, the head10may include a display panel11, a middle cabinet12, a frame13, an end frame14, and a back cover15.

The display panel11may form a front surface of the head10. For example, the display panel11may be an OLED panel, an LCD panel, or an LED panel. The display panel11may divide an image into a plurality of pixels and may output the image while controlling color, brightness, and chroma of the respective pixels. The display panel11may be divided into an active area, in which the image is displayed, and a de-active area in which the image is not displayed. The display panel11may generate light corresponding to red, green, or blue color in response to a control signal.

The middle cabinet12may extend along a periphery of the display panel11. A horizontal part12H may be disposed at the front of the display panel11. A vertical part12V may intersect the horizontal part12H and may cover the side of the display panel11. For example, the middle cabinet12may include a metal or plastic material. The middle cabinet12may be referred to as a side frame or a guide panel.

The frame13may be disposed at the rear of the display panel11. Electronic components, such as a Printed Circuit Board (PCB), may be coupled to a rear surface of the frame13. For example, the frame13may include a metal material. The frame13may be referred to as a mount plate or a module cover.

The end frame14may form a periphery of the head10. A horizontal part14H may be disposed at the front of the horizontal part12H of the middle cabinet12. The vertical part14V may cover the side of the vertical part12V of the middle cabinet12. For example, the end frame14may include a metal or plastic material.

The back cover15may form a rear surface of the head10. The back cover15may cover the rear of the frame13and may be coupled to the frame13.

Referring toFIGS.3and4, a backlight unit110may be disposed between the display panel11and the frame13and may be coupled to the frame13. In this case, the display panel11may be referred to as an LCD panel. The backlight unit110may include an optical layer111and an optical sheet112. The optical layer111may include a substrate111a, at least one light source111b, a reflective sheet111c, and a diffusion plate111d.

The substrate111amay be coupled to a front surface of the frame13. The substrate111amay have a plate shape or may be formed in the shape of a plurality of straps which are vertically spaced apart from each other. The at least one light source111bmay be mounted on the substrate111a. For example, the light source111bmay include a light emitting diode (LED). An electrode pattern for connecting the light source111bto an adapter may be formed on the substrate111a. The reflective sheet111cmay be disposed at the front of the substrate111a. The reflective sheet111cmay have a hole111hin which the light source111bis disposed. The diffusion plate111dmay be disposed at the front of the reflective sheet111c. A spacer111smay support a rear surface of the diffusion plate111dat a position between the reflective sheet111cand the diffusion plate111d.

The optical sheet112may be disposed at the front of the diffusion plate111d. A rear surface of the optical sheet112may come into close contact with the diffusion plate111d, and a front surface of the optical sheet112may come into close contact with or may be adjacent to the rear surface of the display panel11. The optical sheet112may include at least either a diffusion sheet or a prism sheet. A coupling part112dmay be formed on at least one edge of the optical sheet112.

Accordingly, light from the light source111bmay be provided to the display panel11via the diffusion plate111dand the optical sheet112. The display panel11of the present disclosure may be an OLED panel requiring no backlight unit110described above or may be another type of panel.

Referring toFIGS.3and5, a backlight unit110′ may be disposed between the display panel11and the frame13and may be coupled to the frame13. In this case, the display panel11may be referred to as an LCD panel. The backlight unit110′ may include an optical layer111′ and an optical sheet112. The optical sheet111′ may include a substrate111a′, at least one light source111b′, a reflective sheet111f, and a light guide plate111e. The light guide plate111emay be disposed between the frame13and the optical sheet112and may be supported by the frame13.

The substrate111a′ may be adjacent to a periphery of the light guide plate111eand may be coupled to the frame13. The at least one light source111b′ may be mounted on the substrate111a′. For example, the light source111b′ may include a light emitting diode (LED). An electrode pattern for connecting the light source111b′ to an adapter may be formed on the substrate111a′. The reflective sheet111fmay be disposed between the frame13and the light guide plate111eand may be supported by the frame13.

Accordingly, light from the light source111b′ may be provided to the display panel11via the diffusion plate111eand the optical sheet112. The display panel11of the present disclosure may be an OLED panel requiring no backlight unit110′ described above or may be another type of panel.

Referring toFIG.6, electronic components may be mounted on the rear surface of the frame13and may include a plurality of boards PSU, MB, and TC and speakers SPKa and SPKb.

A power supply board PSU may be disposed closer to the first short side SS1than to the second short side SS2and may be coupled to the rear surface of the frame13. The power supply board PSU may supply power to the respective components of the display device. For example, the power supply board PSU may supply power to the light sources111band111b′ of the backlight units110and110′ (seeFIGS.4and5). The power supply board PSU may be referred to as an LED driver.

The main board MB may be disposed closer to the second short side SS2than to the first short side SS1and may be coupled to the rear surface of the frame13. The main board MB may control the display device.

The timing controller board TC may be disposed below the power supply board PSU and the main board MB and may be coupled to the rear surface of the frame13. The timing controller board TC may be electrically connected to the display panel11(seeFIG.3) through a cable (not shown) and may provide an image signal to the display panel11.

The speakers SPKa and SPKb may be disposed above the plurality of boards PSU, MB, and TC and may be coupled to the rear surface of the frame13. For example, a left speaker SPKa may be disposed closer to the first short side SS1than to the second short side SS2and may direct sound in a lateral direction. For example, a right speaker SPKb may be disposed closer to the second short side SS2than to the first short side SS1And may laterally direct sound.

A locking unit18may be coupled to the rear surface of the frame13. The locking unit18may be disposed below the center of the frame13.

Referring toFIG.7, the back cover15may cover the rear of the frame13and may be coupled to the frame13. Positions of speaker holes15aand15bformed in the back cover15may correspond to positions of the speakers SPKa and SPKb (seeFIG.6) mounted to the frame13.

Fixing parts13H may protrude rearward from the rear surface of the frame13. The fixing parts13H may be PEM nuts. The fixing parts13H and the locking unit18may be exposed to the outside through a hole15hformed at the center of the back cover15.

Referring toFIGS.7and8, a fixing plate41may have a circular plate shape corresponding to the hole15hof the back cover15.

Fixing holes41H may be formed in the fixing plate41and may be aligned with the fixing parts13H. A fastening member (not shown), such as a screw, may be fastened to the fixing parts13H through the fixing holes41H. Accordingly, the fixing plate41may be coupled to the frame13.

Referring toFIGS.8and9, a front bracket42of the articulated connector40may be disposed at the rear of the fixing plate41and may have a generally plate shape. A pair of top protrusions42a1and42a2may protrude upward from an upper side of the front bracket42and may be spaced apart from each other in the left-right direction. A pair of bottom protrusions42b1and42b2may protrude downward from a lower side of the front bracket42and may be spaced apart from each other in the left-right direction. The pair of bottom protrusions42b1and42b2may be engaged with a pair of engaging portions1831aand1831bof the locking unit18passing through the fixing plate41, and the pair of top protrusions42a1and42a2may be inserted and coupled to a pair of holes formed in an upper portion of the fixing plate41. Accordingly, the front bracket42may be removably coupled to the fixing plate41.

A pivot shaft44may extend in the front-rear direction. A diameter of a head44aof the pivot shaft44may be greater than a diameter of a body44b. A pair of cut-outs44cmay be formed in a lateral surface of the body44band may face each other. The front bracket42may have a hole42hwhich is formed at the center thereof, and through which the body44bmay pass. The hole42hof the front bracket42may have the same shape as a shape of a longitudinal section of the body44b. Accordingly, the pivot shaft44and the front bracket42may rotate together in an axial direction.

A front grab45amay be disposed between the head44aand a front surface of the front bracket42. A hole45ahof the front grab45amay be aligned with the hole42hof the front bracket42and may have the same shape as the hole42h. The body44bmay pass through the holes45ahand42h. The front grab45amay be fixed to the front bracket42. That is, the front grab45amay rotate together with the pivot shaft44and the front bracket42.

Referring toFIGS.10and11, a rear bracket43may be disposed at the rear of the front bracket42. The rear bracket43may include a mount43F, a left wing43L, and a right wing43R.

The mount43F may face the front bracket42and may have a circular mount hole43Fh. At least one washer43Fw may be disposed between the front bracket42and the mount43F and may have a circular hole. The body44dof the pivot shaft44may pass through the hole of the washer43Fw and the mount hole43Fh and may rotate independently of the washer43Fw and the mount43F.

The left wing43L may extend rearward from a left side of the mount43F. The right wing43R may extend rearward from a right side of the mount43F. A plurality of members45c:45c1,45c2,45c3,45c4, and45c5, which will be described below, may be coupled to the mount43F at positions between the left wing43L and the right wing43R.

A rear grab45c1may be disposed opposite the washer43Fw with respect to the mount43F and may have a circular hole45chthrough which the body44bof the pivot shaft44passes. The rear grab45c1may be fixed to a rear surface of the mount43F.

Further, a plurality of fixing holes45caand a plurality of slots45chmay be formed in the rear grab45c1and may be spaced apart from each other in a circumferential direction of the rear grab45c1. The plurality of fixing holes45caand the plurality of slots45chmay be arranged alternately in a circumferential direction of the rear grab45c1. For example, the fixing holes45caor the slots45chmay be spaced apart from each other at 90-degree intervals. A length of the slot45chmay be greater than a length of the fixing hole45cain the circumferential direction of the rear grab45c1.

A disc45c2may be disposed at the rear of the rear grab45c1and may have a hole45c2hthrough which the body44bpasses and which has the same shape as the longitudinal section of the body44b. A plurality of bosses45ccmay protrude from a front surface of the disc45c2toward the rear grab45c1and may be spaced apart from each other in a circumferential direction of the disc45c2. For example, the bosses45ccmay be spaced apart from each other at 90-degree intervals. A size of the boss45ccmay be equal to a size of the fixing hole45caor may correspond thereto. That is, when the boss45ccis inserted into the fixing hole45ca, rotation of the disc45c2and the pivot shaft44may be limited to some degree by the rear grab45c1. In addition, when the boss45ccis inserted into the slot45ch, the disc45c2and the pivot shaft44may rotate within a trajectory of the slot45ch.

The washer45c3may be disposed at the rear of the disc45c2and may have a circular hole (not numbered) through which the body44bof the pivot shaft44passes.

A disc spring45c4may be disposed opposite the disc45c2with respect to the washer45c3and may have a circular hole (not numbered) through which the body44bof the pivot shaft44passes. The disc spring45c4may have elasticity and may be convex forward or rearward. The disc spring45c4may generate an elastic force in the axial direction.

A cap45c5may be disposed at the rear of the disc spring45c4and may have a hole45c5hthrough which the body44bof the pivot shaft44passes. The hole45c5hmay have the same shape as a shape of the longitudinal section of the body44b. The cap45c5may be fixed to an end of the body44b.

Accordingly, the pivot shaft44may rotate together with the front bracket42, the front grab45a, the disc45c2, and the cap45c5. In addition, the pivot shaft45may rotate independently of the washer43Fw, the rear bracket43, the rear grab45c1, the washer45c3, and the disc spring45c4. In other words, even when the pivot shaft45rotates, the washer43Fw, the rear bracket43, the rear grab45c1, the washer45c3, and the disc spring45c4may not rotate.

Further, a user may pivot the head10(seeFIG.8), fixed to the front bracket42, about the pivot shaft44. For example, the head10may pivot within a range of +90 degrees to −90 degrees. Also, unless an external force at a certain level or higher is applied, the elastic force of the disc spring45c41and45c2may allow the head10to be maintained at a constant pivot angle. In addition, during a pivot motion of the head10, the user may feel the sense of coupling when the boss45ccis inserted into the fixing hole45caor the slot45ch. That is, when the boss45ccmoves out of the slot to be inserted into the fixing hole45ca, the user may feel that the head10is positioned at a pivot angle of zero degrees or +90 or −90 degrees.

Referring toFIG.12, a holder47may be disposed between the left wing43L and the right wing43R. A holder body470may cover the rear of the mount43F of the rear bracket43. A first part47L may protrude toward the mount43F from a left part of the holder body470and may be adjacent to the left wing43L. A second part47R (seeFIG.10) may protrude toward the mount43F from a right part of the holder body47and may be adjacent to the right wing43R.

A tilt shaft46may extend in the left-right direction. The tilt shaft46may pass through the left wing43L, the first part47L, the second part47R, and the right wing43R. A head (not numbered), which is a first end of the tilt shaft46, may be seated on a side surface of the left wing43L. A screw thread may be formed at a second end of the tilt shaft46, and a fastening member46d, such as a nut, may be fastened to the second end of the tilt shaft46on the right wing43R.

In addition, the tilt shaft46may have a generally cylindrical shape and may be fixed to the left wing43L and the right wing43R. The tilt shaft46may be rotatably coupled to the holder47. That is, the tilt shaft46may provide a tilt axis. At least one washer46vmay be disposed between the second part47R and the right wing43R and may have a circular hole through which the tilt shaft46passes.

An elastic member46amay be disposed between the left wing43L and the right wing43R. The elastic member46amay be wound a plurality of times around an outer circumference of the tilt shaft46and may have elasticity. The elastic member46amay be a coil-shaped spring.

Further, a portion46bof the elastic member46amay extend in a direction intersecting the tilt shaft46without being wound around the tilt shaft46. The portion46bof the elastic member46amay be stopped by a seating part43hwhich protrudes rearward from the mount43F.

In addition, a first end of the elastic member46amay be formed on the portion46b, and a second end of the elastic member46amay be fixed to the inside of the holder47. A disc spring46wmay be adjacent to a second end46cof the elastic member46aand may be disposed between the elastic member46aand the second part47R. The disc spring46wmay have a circular hole (not numbered) through which the tilt shaft46passes. The disc spring46wmay be convex toward the elastic member46aand may generate an elastic force in an axial direction of the tilt shaft46.

Accordingly, the tilt shaft46may rotate together with the rear bracket43, the front bracket42, and the plurality of members45c5,45c4,45c3,45c2,45c1,43Fw,45a, and44. In response to the rotation of the tilt shaft46, the head10(seeFIG.8) fixed to the front bracket42may be tilted upward or downward. For example, the head10may be tilted within a range of +25 degrees to −25 degrees. In addition, unless an external force at a certain level or higher is applied, the elastic force of the elastic member46aand the disc spring46wmay allow the head10to be maintained at a constant tilt angle.

Referring toFIGS.13and14, a first rotation unit48may be disposed at the rear of the holder47. A first connecting part471may connect the holder47and the first rotation unit48. For example, the holder47, the first connecting part471, and the first rotation unit48may be formed as one body.

A cable reel49may be disposed at the rear the front bracket42. The cable reel49may be coupled to the left wing43L and the right wing43R via a fastening member49F such as a screw.

The rear bracket43and the holder47may be disposed in an inner space of a hollow cylinder-shaped reel body (not shown) of the cable reel49. A first plate49aand a second plate49bof the cable reel49may protrude from a front end and a rear end, respectively, of the reel body in a radial direction of the reel body and may extend along an outer circumference of the reel body. That is, each of the first plate49aand the second plate49bmay have a generally ring shape. Accordingly, a cable C may be wound around the reel body of the cable reel49at a position between the first plate49and the second plate49b.

Referring toFIGS.14and15, the front bracket42may be removably coupled to the fixing plate41(seeFIG.8).

An inner cover40c1may cover the rear of the cable reel49and may have a cover hole40hthrough which the first rotation unit48passes. Fastening members49f1and49f2may pass through the cable reel49to protrude rearward and may be coupled to the inside of the inner cover40c1. For example, the fastening members49f1and49f2may be screws or bolts.

An inner circumference of an outer cover40c2may be coupled to an outer circumference of the inner cover40c1. The inner cover40c1and the outer cover40c2may cover the rear of the hole15hof the back cover15.

Referring toFIGS.16and17, the arm50may include arm bodies51and52. An upper arm body51and a lower arm body52may be coupled to each other. The arm50may be referred to as a rod50or a link50.

A front portion of the upper arm body51may be spaced upward from a front portion of the lower arm body52. A front groove50g1may be formed in the front portions of the arm bodies51and52and may have a “U” shape that is open forwardly. A rear portion of the upper arm body51may be spaced upward from a rear portion of the lower arm body52. A rear groove50g2may be formed in the rear portions of the arm bodies51and52and may have a “U” shape that is open rearwardly.

An upper insertion hole51amay be formed by vertically passing through the front portion of the upper arm body51and may face the front groove50g1. An upper fastening hole51bmay be formed by vertically passing through the rear portion of the upper arm body51and may face the rear groove50g2.

A lower fastening hole52amay be formed by vertically passing through the front portion of the lower arm body52and may be aligned with the upper insertion hole51a. A lower insertion hole52bmay be formed by vertically passing through the rear portion of the lower arm body52and may be aligned with the upper fastening hole51b.

A cable groove50cmay be formed in a lower surface of the lower arm body52and may extend in a longitudinal direction of the lower arm body52. The cable C (seeFIG.14) may be placed in the cable groove50c.

Referring toFIG.18, an upper cover53may cover a surface of the upper arm body51(seeFIG.17). A lower cover54may cover a surface of the lower arm body52(seeFIG.17). The upper cover53and the lower cover54may be separately formed or may be formed as one body.

The first rotation unit48may be inserted into the front groove50g1and may be rotatably coupled to the arm50. A second rotation unit68may be inserted into the rear groove50g2and may be rotatably coupled to the arm50. The second rotation unit68may protrude toward the rear groove50g2from a vertical member61which will be described later.

Referring toFIGS.18and19, the first rotation unit48may include a first body480, a first fastening member48a, a first upper lock washer48b, a first disc spring48d, a first upper washer48e, a first upper bushing48f, a first lower bushing48g, a first lower washer48h, and a first lower lock washer48c. The first rotation unit48may be referred to as a first swivel unit48or a first swivel module48.

The first body480may be open at the top and bottom. The first body480may have a substantially donut shape. For example, the first body480may be formed as one body with the first connecting part471. The first body480may be inserted into the front groove50g1.

The first fastening member48amay extend vertically. The first fastening member48amay be inserted into the arm50through the upper insertion hole51a(seeFIG.17) and may pass through a hole480hformed at the center of the first body480. A head48ahof the first fastening member48amay be disposed inside the upper arm body51. The first fastening member48amay be screwed into the lower fastening hole52a(seeFIG.17).

The first upper lock washer48bmay be disposed under the head48ahof the first fastening member48a, and the first fastening member48amay pass through the first upper lock washer48b. The first upper lock washer48may be a toothed lock washer, and a tooth48btof the first upper lock washer48bmay be inserted and fixed into a groove (not numbered) formed on the inside of the upper arm body51.

The first disc spring48dmay be disposed under the first upper lock washer48b. The first disc spring48dmay be convex toward the first upper lock washer48band may generate an elastic force in an axial direction of the first fastening member48a.

The first upper washer48emay be disposed under the first disc spring48d, and the first fastening member48amay pass through the first upper washer48e.

The first upper bushing48fmay be disposed opposite the first disc spring48dwith respect to the first upper washer48e. The first fastening member48amay pass through the first upper bushing48f. The first upper busing48fmay have a cylindrical shape having a flange (not numbered) formed at an upper end thereof. The flange of the first upper bushing48fmay contact the first upper groove480aformed along the periphery of the hole480hon an upper surface of the first body480. A portion (not numbered) of the first upper bushing48fmay be inserted into the hole480hof the first body480and may be disposed between an inner circumferential surface of the first body480and an outer circumferential surface of the first fastening member48a.

The first lower bushing48gmay be disposed opposite the first upper busing48fand may be spaced downward from the first upper bushing48f. The first fastening member48amay pass through the first lower bushing48g. The first lower bushing48gmay have a cylindrical shape having a flange (not numbered) formed at a lower end thereof. The flange of the first lower bushing48gmay contact the first lower groove480bformed along the periphery of the hole480hon a lower surface of the first body480. A portion (not numbered) of the first lower bushing48gmay be inserted into the hole480hof the first body480and may be disposed between the inner circumferential surface of the first body480and the outer circumferential surface of the first fastening member48a.

The first lower washer48hmay be disposed under the first lower bushing48g, and the first fastening member48amay pass through the first lower washer48h.

The first lower lock washer48cmay be disposed opposite the first lower bushing48gwith respect to the first lower washer48h, and the first fastening member48amay pass through the first lower lock washer48h. The first lower lock washer48cmay be a toothed lock washer, and a tooth48ctof the first lower lock washer48cmay be inserted and fixed into a groove (not numbered) formed on the inside of the lower arm body52.

Accordingly, the first body480may rotate with respect to the first fastening member48a. That is, the first fastening member48amay provide a first swivel axis. In addition, unless an external force at a certain level or higher is applied, the elastic force of the first disc spring48dmay allow the head10to be maintained at a constant swivel angle.

Referring toFIGS.18and20, the second rotation unit68may include a second body680, a second fastening member68a, a second lower lock washer68b, a second disc spring68d, a second lower washer68e, a second lower bushing68f, a second upper bushing68g, a second upper washer68h, and a second upper lock washer68c. The second rotation unit68may be referred to as a second swivel unit68or a second swivel module68.

The second body680may be open at the top and bottom. The second body680may have a substantially donut shape. For example, the second body680may be connected to the vertical member61by a second connecting part611. For example, the second body680, the second connecting part611, and the vertical member61may be formed as one body. The second body680may be inserted into the rear groove50g2.

The second fastening member68amay extend vertically. The second fastening member68amay be inserted into the arm50through the lower insertion hole52b(seeFIG.17) and may pass through a hole680hformed at the center of the second body680. A head68ahof the second fastening member68amay be disposed inside the lower arm body52. The second fastening member68amay be screwed into the upper fastening hole51b(seeFIG.17).

The second lower lock washer68bmay be disposed above the head68ahof the second fastening member68a, and the second fastening member68amay pass through the second lower lock washer68b. The second lower lock washer68bmay be a toothed lock washer, and a tooth68btof the second lower lock washer68bmay be inserted and fixed into a groove (not numbered) formed on the inside of the lower arm body52.

The second disc spring68dmay be disposed above the second lower lock washer68b. The second disc spring68dmay be convex toward the second lower lock washer68band may generate an elastic force in an axial direction of the second fastening member68a.

The second lower washer68emay be disposed above the second disc spring68d, and the second fastening member68amay pass through the second lower washer68e.

The second lower bushing68fmay be disposed opposite the second disc spring68dwith respect to the second lower washer68e. The second fastening member68amay pass through the second lower bushing68f. The second lower bushing68fmay have a cylindrical shape having a flange (not numbered) formed at a lower end thereof. The flange of the second lower bushing68fmay contact the second lower groove680aformed along the periphery of the hole680hon a lower surface of the second body680. A portion (not numbered) of the second lower bushing68fmay be inserted into the hole680hof the second body680and may be disposed between an inner circumferential surface of the second body680and an outer circumferential surface of the second fastening member68a.

The second upper bushing68gmay face the second lower busing68fand may be spaced upward from the second lower busing68f. The second fastening member68amay pass through the second upper busing68g. The second upper busing68gmay have a cylindrical shape having a flange (not numbered) formed at an upper end thereof. The flange of the second upper busing68gmay contact the second upper groove680bformed along the periphery of the hole680hon an upper surface of the second body680. A portion (not numbered) of the second upper bushing68gmay be inserted into the hole680hof the second body680and may be disposed between the inner circumferential surface of the second body680and the outer circumferential surface of the second fastening member68a.

The second upper washer68hmay be disposed above the second upper bushing68g, and the second fastening member68amay pass through the second upper washer68h.

The second upper lock washer68cmay be disposed opposite the second upper bushing68gwith respect to the second upper washer68h, and the second fastening member68amay pass through the second upper lock washer68c. The second upper lock washer68cmay be a toothed lock washer, and a tooth68ctof the second upper lock washer68cmay be inserted and fixed into a groove (not numbered) formed on the inside of the upper arm body51.

Accordingly, the second body680may rotate with respect to the second fastening member68a. That is, the second fastening member68amay provide a second swivel axis. In addition, unless an external force at a certain level or higher is applied, the elastic force of the second disc spring68dmay allow the head10to be maintained at a constant swivel angle.

Referring toFIG.21, the arm50may extend in a direction intersecting the head10and the pole30. The arm50may connect the articulated connector40and the elevating module60. The second rotation unit68of the elevating module60may be connected with the vertical member61by the second connecting part611. The second connecting part611may pass through the pole30.

The vertical member61may extend in a longitudinal direction of the pole30. The vertical member61may be accommodated inside the pole30.

The pole30may extend vertically and may surround the vertical member61. A plurality of ribs30a,30b,30c, and30dmay protrude toward the vertical member61from an inner circumferential surface of the pole30and may be spaced apart from each other in a circumferential direction of the pole30. A first rib30a, a second rib30b, a third rib30c, and a fourth rib30dmay be located at the vertices of an arbitrary square inside the pole30.

In addition, an insertion part31of the pole30may be inserted into and coupled to a port21formed in an upper surface of the base20.

Referring toFIGS.21and22, the vertical member61may be generally in the shape of a cylinder cut in half. The vertical member61may be open at the rear and bottom, and the top of the vertical member61may be blocked by a partition wall61w.

A stem63smay extend vertically and may be aligned with the vertical member61. A lower end of the stem63smay be inserted into the port21of the base20.

Gas springs62and63may include an upper shaft62and a lower shaft63coupled to the upper shaft62. The upper shaft62may extend in a longitudinal direction of the vertical member61. The upper shaft62may have a cylindrical shape with a closed top. At least a portion of the upper shaft62may be accommodated in the vertical member61. The lower shaft63may extend in a longitudinal direction of the upper shaft62and may have a smaller diameter than that of the upper shaft62. That is, the lower shaft63may be inserted into the upper shaft62. A lower end of the lower shaft63may be fixed on the stem63s.

Clamps64and65may be disposed opposite the vertical member61with respect to the upper shaft62. In other words, the upper shaft62may be disposed between the vertical member61and the clamps64and65. For example, the clamps64and65may include a plurality of clamps64and65which are vertically spaced apart from each other.

The clamps64and65may include semi-cylinders640and650, left flanges641and651, and right flanges642and652. The semi-cylinders640and650may contact an outer circumference of the upper shaft62. The left flanges641and651may extend leftward from a first side of the semi-cylinders640and650and may be coupled to first parts61s1and65s1of the vertical member61by fastening members64F and65F. The right flanges642and652may extend rightward from a second side of the semi-cylinders640and650and may be coupled to a second part (not shown) of the vertical member61by a fastening member (not shown).

Accordingly, the upper shaft62may be removably coupled to the vertical member61and may move upward or downward along the lower shaft63.

Referring toFIGS.22and23, rollers66a,66b,67a, and67bmay be adjacent to the clamps64and65. For example, first rollers66aand66bmay be adjacent to a first clamp64, and second rollers67aand67bmay be adjacent to a second clamp65.

The first rollers66aand66bmay include a first left roller66aand a first right roller66b. A body66a1aof a first left pin66a1may pass through the first left roller66aand a left part61L of the vertical member61. A flange66a1bof the first left pin66a1may be disposed between the first left roller66aand the left part61L. The first left roller66amay be coupled to the left part61L by the first left pin66a1. A body66b1aof a first right pin66b1may pass through the first right roller66band a right part61R of the vertical member61. A flange66b1bof the first right pin66b1may be disposed between the first right roller66band the right part61R. The first right roller66bmay be coupled to the right part61R by the first right pin66b1.

For example, the second rollers67aand67bmay have the same shape as the first rollers66aand66b. That is, the above description of the first rollers66aand66bmay also be applied to the second rollers67aand67b. Accordingly, the second left roller67amay be coupled to the left part61L, and the second right roller67bmay be coupled to the right part61R.

In addition, the left rollers66aand67amay be disposed between the third rib30cand the fourth rib30dand may contact the third rib30cand the fourth rib30d. The right rollers66band67bmay be disposed between the first rib30aand the second rib30band may contact the first rib30aand the second rib30b.

Accordingly, the vertical member61may smoothly move up and down inside the pole30by the rollers66a,66b,67a, and67b.

Referring toFIGS.22and24, a left flange641of the first clamp64may be disposed between the third rib30cand the fourth rib30d. A first right flange642of the first clamp64may be disposed between the first rib30aand the second rib30b. The first clamp64may include a first central protrusion64a, a first left protrusion64b, and a first right protrusion64c.

The first central protrusion64amay protrude toward the inside of the pole30from a first semi-cylinder650and may contact the inside of the pole30. The first left protrusion64bmay protrude toward the third rib30cfrom the first left flange641and may contact the third rib30c. The first right protrusion64cmay protrude toward the second rib30bfrom the first right flange642and may contact the second rib30b. Accordingly, the first central protrusion64a, the first left protrusion64b, and the first right protrusion64cmay cause friction between the vertical member61and the pole30.

For example, the second clamp65may be spaced downward from the first clamp64and may have the same shape as the first clamp64. That is, the above description of the first clamp64may also be applied to the second clamp65. Accordingly, a second central protrusion65a, a second left protrusion65b, and a second right protrusion65cof the second clamp65may cause friction between the vertical member61and the pole30.

Accordingly, unless an external force at a certain level or higher is applied, the frictional force between the protrusions64a,64b,64c,65a,65b, and65cand the pole30may allow the vertical member61to be maintained at a constant position (height) with respect to the base20.

Referring toFIGS.23and24, a cable groove61gmay be formed in a front portion61F of the vertical member61and may be elongated vertically. The cable C may be inserted into the cable groove61g. The cable C may be disposed along the cable groove50c(seeFIG.14) of the arm50and may be electrically connected to the head10. The cable C may be disposed along the stem63s(seeFIG.22) and may be electrically connected to a battery Bt (seeFIG.1) disposed in the base20and the like. The battery Bt may supply power to the head10through the cable C. The battery Bt may be a rechargeable battery. The cable C may be a power cable and/or a signal cable. The cable C may have several strands.

Referring toFIGS.25and26, the base20may include a lower body20aand an upper body20b. The lower body20amay form a lower surface of the base20and may have a generally round tray shape which is open at the top. The upper body20bmay form an upper surface of the base20and may have a generally round tray shape which is open at the bottom. An outer diameter D20of the upper body20bmay be substantially equal to an outer diameter of the lower body20a.

A flat weight81may be disposed in an inner space of the base20, i.e., a space between the lower body20aand the upper body20b, and may be disposed on the lower body20a. The flat weight81may be referred to as a support weight or a flat plate.

A weight82may be disposed in the inner space of the base20and may be disposed on the flat weight81. The weight82may be referred to as a core weight.

A substate BC and a bottom connector89may be disposed in the inner space of the base20and may be disposed on the flat weight81. An indicator ID may be disposed on the weight82. The battery Bt and a wheel assembly29may be coupled to a lower surface of the lower body20a.

Referring toFIGS.27and28, a seating part24may be formed by being pressed upward from the lower surface of the lower body20a. The seating part24may protrude upward beyond an upper surface of the lower body20a. An opening24hmay be formed in a side wall of the seating part24and may communicate with the inner space of the base20.

The battery Bt may be inserted into the seating part24from below the lower body20a. The battery Bt may be seated on and coupled to the seating part24. A second cable C11may be electrically connected to the battery Bt and may pass through the opening24h. A battery cover20cmay be removably coupled to the lower body20aby a fastening member Fyy such as a screw, and may cover a lower surface of the battery Bt. The cover20cmay form the lower surface of the base20along with the lower body20a.

For example, the battery Bt may be a rechargeable battery. For example, the battery Bt may be replaceable.

A recessed portion22may be formed by being pressed upward from the lower surface of the lower body20a. The recessed portion22may protrude upward beyond the upper surface of the lower body20a. The recessed portion22may have a cylindrical shape. The recessed portion22may be adjacent to a circumference of the lower body20a. For example, a plurality of recessed portions221,222,223,224, and225may be spaced apart from each other along the circumference of the lower body20a.

A lower fixing hole22amay be formed through an upper surface of the recessed portion22. For example, the lower fixing hole22amay include a pair of fixing holes22awhich are spaced apart from each other. A base hole22bmay be formed through the upper surface of the recessed portion22and may be spaced apart from the lower fixing hole22a. For example, the base hole22bmay be disposed between the pair of fixing holes22a. Each of the plurality of recessed portions221,222,223,224, and225may have the lower fixing hole22aand the base hole22b.

The flat weight81may be formed flat. The flat weight81may be parallel to the upper surface of the lower body20a. The flat weight81may have a generally circular plate shape. The flat weight81may include a flat weight hole81h, a mounting surface81m, and major arcs811,812,813,814, and815(seeFIG.25).

The flat weight hole81hmay be formed by passing through the flat weight81in a thickness direction of the flat weight81and may correspond to the seating part24. When the flat weight81is seated on the lower body20a, the seating part24may pass through the flat weight hole81h.

The mounting surface81mmay be adjacent to the flat weight hole81hand may form a portion of the upper surface of the flat weight81.

The major arcs811,812,813,814, and815may be formed from a circumference of the flat weight81toward the inside of the flat weight81. The major arcs811,812,813,814, and815may be holes formed by cutting out a portion of the flat weight81and may be in the shape of an arc greater than a semi-circle. When the flat weight81is seated on the lower body20a, the recessed portion22may be disposed in the major arcs811,812,813,814, and815. Each of a first major arc811, a second major arc812, a third major arc813, a fourth major arc814, and a fifth major arc815may extend along a portion of a lateral surface of each of a first recessed portion221, a second recessed portion222, a third recessed portion223, a fourth recessed portion224, and a fifth recessed portion225. Each of the first major arc811, the second major arc812, the third major arc813, the fourth major arc814, and the fifth major arc815may be engaged with the lateral surface of each of the first recessed portion221, the second recessed portion222, the third recessed portion223, the fourth recessed portion224, and the fifth recessed portion225.

A fastening member Fy, such as a screw, may pass through the lower surface of the lower body20aand may be coupled to the flat weight81seated on the lower body20a. For example, a plurality of fastening members Fy may be adjacent to an outer circumference of the flat weight81and may be spaced apart from each other along the circumference of the flat weight81. Accordingly, the flat weight81may be removably coupled to the lower body20a.

The substrate BC may be mounted on the mounting surface81m. The substrate BC may be a Printed Circuit Board (PCB). The substrate BC may be referred to as a battery charger. A bottom plate BCP may be disposed between the substrate BC and the mounting surface81m.

The bottom connector89may be disposed on the flat weight81. For example, the bottom connector89may be disposed between the first recessed portion221and the second recessed portion222. The bottom connector89may include a bottom housing89a, at least one pin89b, and a coupling hole89h. The bottom housing89amay have a hollow cylindrical shape, and the pin89bmay be disposed in an inner space of the bottom housing89a. The coupling hole89hmay be disposed outside of the bottom housing89a. The bottom connector89may be referred to as a bottom docking connector.

A first end of a first cable C10may be electrically connected to the bottom connector89, and a second end of the first cable C10may be electrically connected to a first terminal T11of the substrate BC. A first end of the second cable C11may be electrically connected to a second terminal T12of the substrate BC, and a second end of the second cable C11may be electrically connected to the battery Bt.

A coupling part81P may protrude upward from the upper surface of the flat weight81. A plurality of coupling parts81P may be disposed around the bottom connector89.

Referring toFIGS.28and29, a weight82may be adjacent to the circumference of the flat weight81and may be seated on the flat weight81. For example, a plurality of weights821,822,823, and824may be disposed along the circumference of the flat weight81and may be adjacent to each other. Alternatively, the plurality of weights821,822,823, and824may be formed as one body.

A first weight821may extend along a front portion of a lateral wall of the lower body20a. The first recessed portion221and the second recessed portion222may be received in a groove formed in a lower surface of the first weight821. A fastening member Fx, such as a screw, may pass through the first weight821and may be coupled to a portion of the flat weight81on which the first weight821is placed. That is, the first weight821may be coupled to the flat weight81. Meanwhile, the first cable C10may be disposed in a cable groove formed in a lower surface of the first weight821.

The second weight822may extend along a left portion of the lateral wall of the lower body20a. The third recessed portion223may be received in a groove formed in a lower surface of the second weight822. The fastening member Fx, such as a screw, may pass through the second weight822and may be coupled to a portion of the flat weight81on which the second weight822is placed. That is, the second weight822may be coupled to the flat weight81.

The third weight823may extend along a rear portion of the lateral wall of the lower body20a. The fourth recessed portion224may be received in a groove formed in a lower surface of the third weight823. The fastening member Fx, such as a screw, may pass through the third weight823and may be coupled to a portion of the flat weight81on which the third weight823is placed. That is, the third weight823may be coupled to the flat weight81.

The fourth weight824may extend along a right portion of the lateral wall of the lower body20a. The fifth recessed portion225may be received in a groove formed in a lower surface of the fourth weight824. The fastening member Fx, such as a screw, may pass through the fourth weight824and may be coupled to a portion of the flat weight81on which the fourth weight824is placed. That is, the fourth weight824may be coupled to the flat weight81.

In addition, an upper fixing hole82h1may be formed in each of the plurality of weights821,822,823, and824, and may be aligned with the lower fixing hole22aof each of the plurality of recessed portions221,222,223,224, and225.

In this case, the first recessed portion221and the second recessed portion222may be coupled to the first weight821in such a manner that a fastening member F1(seeFIG.32), such as a screw, is coupled to the upper fixing hole82h1of the first weight821through the lower fixing hole22a. In the same manner, the third recessed portion223, the fourth recessed portion224, and the fifth recessed portion225may be coupled to the second weight822, the third weight823, and the fourth weight824, respectively.

Accordingly, the plurality of weights821,822,823, and824may be coupled to the flat weight81and the lower body20a.

The aforementioned plurality of weights821,822,823, and824may be disposed along the circumference of the lower body20a. The weights821,822,823, and824may include a metal material. For example, the weights821,822,823, and824may be formed by casting using a material such as Fe. In this case, the weights821,822,823, and824may improve stability of the base20. Here, as the stability of the base increases, the base20placed on the ground may not be easily overturned.

The aforementioned flat weight81may support the plurality of weights821,822,823, and824. Flatness of the plurality of weights821,822,823, and824may be corrected by the flat weight81. For example, the flat weight81may be formed by die casting using a material such as aluminum Al. A mass of the flat weight81may be smaller than a mass of the weight82. A thickness of the flat weight81may be smaller than a thickness of the weight82. In this case, the stability of the base20may be mainly achieved by the weight82, and the flatness of the weight82may be corrected by the flat weight81.

The bottom housing89aof the bottom connector89may pass through the first weight821. A fastening member89F (seeFIG.38), such as a screw, may pass through a hole (seeFIG.38) of the first weight821disposed around the bottom housing89aand may be coupled to the coupling hole89hof the bottom connector89. Accordingly, the bottom connector89may be coupled to the first weight821at a position between the flat weight81and the first weight821.

A ridge82amay be formed at the center of the first weight821and may be in the shape of a monticule. The ridge82amay be formed around the bottom housing89aof the bottom connector89. The ridge82amay correspond to a shape of the port21(seeFIG.26) of the upper body20band may support the port21.

A supporter81S may protrude upward from an upper surface of the flat weight81and may be adjacent to the substrate BC. For example, the supporter81S may be provided in plurality. At a position near the substrate BC, the supporter81S may support the upper body20band may prevent damage to the substrate BC caused due to sagging or pressing of the upper body20b.

Referring toFIG.30, the lower body20amay include a bottom20a1and a lateral wall20a2. A snap groove20aqmay be formed in the lateral wall20a2of the lower body20a. The upper body20bmay include a top20b1and a lateral wall20b2. A snap projection20bpmay be formed on the inside of the lateral wall20b2of the upper body20band may be coupled to the snap groove20aqby a snap-fit connection. Accordingly, the upper body20bmay be removably coupled to the lower body20a.

A support rib20rmay be formed on the inside of the lateral wall20a2of the lower body20a. The support rib20rmay be adjacent to or may contact a lateral surface of the weight82and/or the flat weight81. Accordingly, the support rib20rmay minimize deformation of the base20.

Referring back toFIGS.28and29, a weight hole82h2may be formed in each of the plurality of weights821,822,823, and824. For example, the number of the weight holes82h2may be four or any number. Four weight holes82h2may be located at the vertices of a square.

The weight holes82h2of the first weight821may vertically communicate with the base holes22bof the first recessed portion221and the second recessed portion222. The weight hole82h2of the second weight822may vertically communicate with the base hole22bof the third recessed portion223. The weight hole82h2of the third weight823may vertically communicate with the base hole22bof the fourth recessed portion224. The weight hole82h2of the fourth weight824may vertically communicate with the base hole22bof the fifth recessed portion225.

Referring toFIGS.31and32, the wheel assembly29may include an upper plate29a, a lower plate29b, a bearing29c, a shaft29d, a bridge29e, and a wheel29f.

The upper plate29amay be disposed in the base hole22b(seeFIG.28) of the recessed portion22. The upper plate29amay contact a groove of the weight82in which the recessed portion22is received. A fastening member F2, such as a screw, may pass through the upper plate29aand the base hole22band may be coupled to the weight hole82h2(seeFIG.29). Accordingly, the upper plate29amay be coupled to the weight82.

The lower plate29bmay be disposed below the upper plate29a. A shaft29dmay pass through the lower plate29band the upper plate29aand may couple the lower plate29bto the upper plate29a. The lower plate29bmay rotate about an axial direction of the shaft29d. The shaft29dmay provide a first axis of rotation of the wheel assembly29which is vertically parallel. The bearing29cmay be disposed between the lower plate29band the upper plate29a. For example, the bearing29cmay be a plurality of ball bearings disposed around a circumference of the shaft29d.

The bridge29emay extend downward from the lower plate29b. For example, the bridge29emay be formed as one body with the lower plate29b.

The wheel29fmay be rotatably coupled to the bridge29eand may be coupled to the lower plate29bvia the bridge29e. The wheel29fmay provide a second axis of rotation of the wheel assembly29which is horizontally parallel. A center of rotation29fcof the wheel29fmay be offset by a certain distance e10from the axial direction of the shaft29d. A movement trajectory of the wheel29f, which corresponds to the rotation of the lower plate29b, may be formed on the inside of the recessed portion22.

Further, the wheel29fmay protrude downward beyond the bottom20a1of the lower body20a. That is, the wheel29fmay be placed on the ground, and the bottom20a1may be spaced upward from the ground. For example, the wheel20fmay include rubber, silicon, resin, or ABS material.

For example, the wheel assembly29may include a plurality of wheel assemblies291,292,293,294, and295which are spaced apart from each other along the circumference of the lower body20a.

A first wheel assembly291may be coupled to the first weight821(seeFIG.29) through the base hole22b(seeFIG.28) of the first recessed portion221. A second wheel assembly292may be coupled to the first weight821(seeFIG.29) through the base hole22b(seeFIG.28) of the second recessed portion222. A third wheel assembly293may be coupled to the second weight822(seeFIG.29) through the base hole22b(seeFIG.28) of the third recessed portion223. A fourth wheel assembly294may be coupled to the third weight823(seeFIG.29) through the base hole22b(seeFIG.28) of the fourth recessed portion224. A fifth wheel assembly295may be coupled to the fourth weight824(seeFIG.29) through the base hole22b(seeFIG.28) of the fifth recessed portion225.

Accordingly, as the plurality of wheel assemblies291,292,293,294, and295are coupled to the plurality of weights821,822,823, and824having flatness corrected by the flat weight81(seeFIG.29), the plurality of wheel assemblies291,292,293,294, and295may have improved balance and driving stability.

Meanwhile, a bottom hole20hmay be formed by passing through the lower body20ain a thickness direction of the lower body20aand may be adjacent to the circumference of the lower body20a. A position of the bottom hole20hmay correspond to a position of the pole30(seeFIG.33) coupled to the base20.

In this case, the first wheel assembly291and the second wheel assembly292may be adjacent to the bottom hole20h. With respect to a center0cof the base20, an angle theta a between the first wheel assembly291and the second wheel assembly292may be a minimum angle among angles between the plurality of wheel assemblies291,292,293,294, and295. With respect to the center0cof the base20, each of an angle theta b between the second wheel assembly292and the third wheel assembly293, an angle theta c between the third wheel assembly293and the fourth wheel assembly294, an angle theta d between the fourth wheel assembly294and the fifth wheel assembly295, and an angle theta e between the fifth wheel assembly295and the first wheel assembly291may be greater than the angle theta a. For example, the angles theta a, theta b, theta c, theta d, and theta e may be substantially equal to each other.

Accordingly, two or more wheel assemblies, such as the first and second wheel assemblies291and292, may be coupled to the pole30(seeFIG.33), thereby stably supporting a portion of the base20on which load is concentrated.

Referring toFIGS.33to35, the port21may be formed in the upper body20band may be in the shape of a monticule. A first guide rib21rmay be formed on the inside of the port21. A second guide rib82rmay be formed on a lateral wall of the ridge82a. For example, the second guide rib82rmay be defined by grooves formed by cutting out a portion of the lateral wall of the ridge82a. The second guide rib82rmay be vertically aligned with the first guide rib21r.

An insertion part31may be formed at a lower end of the pole30. The insertion part31may be part of the pole30. An outer diameter of the insertion part31may be smaller than an outer diameter of the pole30(see tz ofFIG.35) and may be substantially equal to an inner diameter of the port21. A guide slit31smay be formed in a lateral surface of the insertion part31and may be vertically aligned with the first guide rib21r. When the insertion part31is inserted into the port21, the first guide rib21rand the second guide rib82rmay be inserted into the guide slit31s. The insertion part31, inserted into the port21, may be surrounded by the ridge82aand may be seated on a seating surface82bof the first weight821.

A fastening member F, such as a screw, may pass through the bottom hole20h, the coupling part81P (seeFIG.28), and a hole (seeFIG.38) aligned with the coupling part81P of the first weight821and may be coupled to a plurality of ribs30a,30b,30c, and30dof the pole30. Accordingly, the pole30may be coupled to the port21.

The stem63smay be partially disposed within the insertion part31and may be coupled to the insertion part31by a fastening member Fz such as a screw.

A top connector79may be disposed inside the insertion part31and may be coupled to the stem63sby a fastening member79F such as a screw. The top connector79may face downward. The top connector79may be referred to as a top docking connector.

A bottom connector89may face upward through the port21. The bottom connector89may be vertically aligned with the top connector79. The bottom connector89may be referred to as a bottom docking connector.

Referring toFIGS.36to38, the top connector79may include a top housing79a, at least one pin hole79b, and a bracket790. The top housing79amay have a cylindrical shape, and the pin hole79bmay be formed inside the top housing79a. The bracket790may be coupled to an upper surface of the top housing79aand may have an insertion groove790uformed along a circumference of the top housing79a. The bracket790may have a hole790hthrough which the fastening member79F (seeFIG.35) may pass. A top groove79cmay be formed in a lateral surface of the top housing79aand may extend vertically. A top boss79dmay protrude toward the insertion groove790ufrom a portion of the bracket790that defines a boundary of the insertion groove790u.

The bottom connector79may include the bottom housing89a, the at least one pin89b, and a jack89j. The bottom housing89amay have a hollow cylindrical shape, and the pin89bmay be disposed in the inner space of the bottom housing89a. For example, the number of the pins89bmay be five or any number. The jack89imay be formed on one side of the bottom connector89. The bottom boss89cmay be formed on the inside of the bottom housing89a. The bottom groove89dmay be formed in an outer surface of the bottom housing89aand may face the bottom boss89c.

Accordingly, when insertion part31of the pole30is inserted into the port21, the bottom boss89cmay be inserted into the top groove79c, and the top boss79dmay be inserted into the bottom groove89d. In addition, the pin89bmay be inserted into the pin hole79b. In this case, the cable C connected to the top connector79and the first cable C10connected to the bottom connector89may be electrically connected to each other through the pin hole79band the pin89b.

A power cable (not shown) may be electrically connected to the jack89i. In this case, external power may be supplied to the battery Bt through the power cable, the bottom connector89, the first cable C10, the first terminal T11, the substrate BC, the second terminal T12, and the second cable C11, thereby charging the battery Bt (seeFIG.29and the like).

The power cable may be removed from the jack89i. In this case, the power of the battery Bt may be supplied to the head10through the second cable C11, the second terminal T12, the substrate BC, the first terminal T11, the first cable C10, the bottom connector89, the top connector79, and the cable C.

The indicator ID may be electrically connected to a third terminal T13of the substrate BC through the third cable C12and may detect a remaining capacity of the battery Bt. A light emitting element IDL (seeFIG.33) of the indicator ID may be formed on the upper body20band may display a remaining capacity of the Battery Bt for a user.

Referring toFIG.39, the head10may be spaced upward from the base20. A user may pivot the head10. A pivot axis may pass through the center of the head10and may be orthogonal to the head10. Referring to the left drawing ofFIG.39, the head10may be positioned in a horizontal mode. Referring to the right drawing ofFIG.39, the head10may be positioned in a vertical mode.

Referring toFIG.40, a user may tilt the head10. A tilt axis is located behind the center of the head10and may be a horizontal axis parallel to the head10. The user may swivel the head10. A first swivel axis may be a vertical axis adjacent to a first end of the arm50. A second swivel axis may be a vertical axis adjacent to a second end of the arm50. The user may raise or lower the head10along the pole30.

The pivot, tilt, swivel, and elevating motions of the head10described above may be performed independently of each other. For example, the head10may pivot within a range of +90 degrees to −90 degrees. For example, the head10may be tilted within a range of +25 degrees to −25 degrees. For example, the head10may swivel within a range of +65 degrees to −65 degrees. For example, in the horizontal mode, the head10may be located at a position of 1065 mm to 1265 mm above the base20or the ground.

Referring toFIGS.39and40, the base20may stably support various motions of the display device by using the motion module MM. In addition, the base20may improve stability of movement of the display device by using the wheel assembly29(seeFIG.34).

Referring toFIGS.1to40, a display device according to an embodiment of the present disclosure may include: a head including a display panel; an arm to which the head is pivotally coupled; a pole to which the arm is coupled; and a base to which the pole is coupled, wherein the base includes: a lower body forming a bottom; an upper body which is coupled to the lower body and to which the pole is fixed; a weight disposed between the lower body and the upper body; and a wheel disposed outside of the lower body, passing through the lower body and coupled to the weight.

The pole may be adjacent to an edge of the upper body, and the wheel may include a plurality of wheels coupled to the weight, wherein the plurality of wheels may include: a first wheel adjacent to a position corresponding to the pole of the lower body; and a second wheel opposite to the first wheel with respect to the position corresponding to the pole of the lower body, wherein with respect to a center of the lower body, an angle between the first wheel and the second wheel may be a minimum angle among angles between the plurality of wheels.

The base may further include a flat weight which is disposed between the lower body and the weight and to which the weight is coupled, wherein the wheel may pass through the lower body and the flat weight and is coupled to the weight. The flat weight may be formed flat, and a mass of the weight may be greater than a mass of the flat weight.

The lower body may be directly coupled to the flat weight and the weight, and the weight may be directly coupled to the flat weight.

The flat weight may have a circular plate shape, and the weight may include a plurality of weights disposed along an edge of the flat weight.

The lower body may further include a recessed portion formed from the lower body toward the upper body, the recessed portion having a base hole facing the weight, wherein the flat weight may further include major arcs formed at an edge of the flat weight and extending along a portion of a lateral surface of the recessed portion, wherein the wheel may be coupled to the weight through the base hole.

The lower body may further include recessed portions formed from the lower body toward the upper body and accommodating a portion of the wheel, wherein the wheel may include a first axis of rotation intersecting the lower body and passing through the recessed portion; and a second axis of rotation parallel to the lower body and offset by a certain distance from the first axis of rotation.

The display device may further include a wheel assembly having the wheel, wherein the wheel assembly may include: an upper plate fixed to the weight; a lower plate opposite to the upper plate; a shaft which passes through the lower plate and the upper plate and to which the lower plate is coupled so as to be rotatable about the second axis of rotation; a bearing disposed between the upper plate and the lower plate; and a bridge which extends from the lower plate toward the wheel and to which the wheel is coupled so as to be rotatable about the second axis of rotation.

The lower body may include a lateral wall forming a perimeter of the lower body; and a support rib formed at an inside of the lateral wall, wherein the weight may be adjacent to the lateral wall, and the support rib may be adjacent to or may contact a lateral surface of the weight.

The upper body may be coupled to the lower body by a snap-fit connection, and the upper body and the lower body may include a plastic material.

The upper body may further include a port through which the pole is inserted and which is seated on the weight, wherein the weight may further include: a ridge formed at an upper surface of the weight and surrounding the pole inserted into the port; and a fastening member passing through the lower body and the weight and coupled to the pole.

The pole may include an insertion part inserted into the port, the insertion part having a slit formed at a lateral surface of the insertion part, wherein the port may further include a first guide rib formed at an inside of the port and inserted into the slit, and the ridge may further include a second guide rib formed at a lateral surface of the ridge and inserted into the slit.

The display device may further include: a top connector disposed inside the pole; and a bottom connector disposed on the weight, coupled to the top connector, and electrically connected to the top connector.

The display device may further include a battery disposed between the lower body and the upper body, coupled to the lower body, and electrically connected to the bottom connector.

The display device according to the present disclosure has the following effects.

According to at least one of the embodiments of the present disclosure, a display device including a stand for a display panel may be provided.

According to at least one of the embodiments of the present disclosure, a structure for freely adjusting an angle or position of a head having a display panel may be provided.

According to at least one of the embodiments of the present disclosure, a structure for allowing various motions of a head, including a pivot motion, a tilt motion, a swivel motion, and an elevating motion, to be performed independently of each other may be provided.

According to at least one of the embodiments of the present disclosure, a structure for improving standing stability of a display device may be provided.

According to at least one of the embodiments of the present disclosure, a structure for improving driving stability of a moving base having a wheel may be provided.

Certain embodiments or other embodiments of the invention described above are not mutually exclusive or distinct from each other. Any or all elements of the embodiments of the invention described above may be combined or combined with each other in configuration or function.

For example, a configuration “A” described in one embodiment of the invention and the drawings and a configuration “B” described in another embodiment of the invention and the drawings may be combined with each other. Namely, although the combination between the configurations is not directly described, the combination is possible except in the case where it is described that the combination is impossible.

The foregoing embodiments are merely examples and are not to be considered as limiting the present disclosure. The scope of the present disclosure should be determined by rational interpretation of the appended claims, and all modifications within the equivalents of the disclosure are intended to be included within the scope of the present disclosure.