Monitor holder and its pivot joint

Abstract

A monitor holder and its pivot joint are provided. [Solution] The joint unit includes a coupling unit and a movable unit, the coupling unit includes a pivot base 31 having a storage tank 313, a central block 32 installed in the storage tank having a circular portion 321 and two non-circular portions 322 on both sides of the circular portion, a unidirectional rotating member 33 installed between the pivot base and the central block and fitted into the circular portion, and two damper bases 34 fixed to the two non-circular portions and having first contact surfaces 346 adjacent to the unidirectional rotating member, the movable unit includes a movable base 41 to which the coupling unit is attached and which is rotatable in the vertical direction, two end covers 42 installed on the movable base and in frictional contact with the damper base, and a central rod 43 passing through the end covers, the movable base and the coupling unit, each end cover having a first friction surface 425 that is rotatably in contact with the first contact surface so as to be frictional with the first contact surface.

Description

Technical Field

[0001] The present invention relates to a monitor holder, and particularly to a monitor holder with excellent operating feeling and its pivot joint.

Background Art

[0002] A monitor holder can support a monitor (display) and be used to change the viewing angle. Some monitor holders adopt an arm design that can be adjusted with three degrees of freedom, allowing the monitor to float on the desktop or move freely in three-dimensional space, which is very convenient.

[0003] The monitor holder and its adjustment mechanism described in Patent Document 1 are used to connect with a liquid crystal display. The adjustment mechanism includes a U-shaped component, a support component, two friction components, two spacers, and one fastening component.

[0004] The U-shaped component has two wing-shaped plates extending in parallel. The support component is accommodated between the two wing-shaped plates. The two friction components are respectively arranged outside the two wing-shaped plates. The two spacers are respectively sandwiched between the two wing-shaped plates and the two friction components. The fastening component penetrates through the two friction components, the two spacers, the two wing-shaped plates, and the support component.

[0005] Friction between the inner surfaces of the two wing-shaped plates and both ends of the support component and friction between the outer surfaces of the two wing-shaped plates and the two spacers prevent the liquid crystal display from rotating downward and exert a positioning effect by the frictional force.

[0006] However, when rotating the liquid crystal display upward, the above-described adjustment mechanism needs to overcome gravity and friction force simultaneously, which requires effort and deteriorates the operating feeling.

Prior Art Documents

Patent Documents

[0007] [Patent Document 1] Chinese Utility Model No. CN221570038 Specification [Overview of the project] [Problems that the invention aims to solve]

[0008] Therefore, the objective of this invention is to provide a pivot joint for a monitor holder that offers excellent operability. [Means for solving the problem]

[0009] This invention relates to a pivot joint for a monitor holder that can swing in the vertical direction, and includes a joint unit and a movable unit. The aforementioned joint unit includes a pivot base, a central block, a unidirectional rotating member, and two damper bases. The pivot base has a housing tank surrounding the axis, The central block is installed in the storage tank along the axis and has a circular portion and two non-circular portions connected to opposite sides of the circular portion in the left-right direction. The aforementioned axis extends in the left-right direction, The unidirectional rotating member is installed between the pivot base and the central block and is fitted into the circular portion of the central block. The two damper bases are each fixed to the two non-circular portions of the central block and are adjacent to the unidirectional rotating member. Each of the damper bases has a first contact surface surrounding the axis, The movable unit is configured to be attached to the joint unit and is rotatable in the vertical direction relative to the pivot base. The movable unit includes a movable base rotatable relative to the pivot base, two end covers mounted on the movable base spaced apart in the left-right direction and in contact with the two damper bases so as to be able to rub against each of the two damper bases, and a central rod installed along the axis through the two end covers, the movable base and the joint unit. Each of the end covers has a first friction surface that surrounds the axis and is rotatably in contact with the corresponding first contact surface so as to be able to rub against it. The present invention provides a pivot joint for a monitor holder in which the resistance force when the movable unit rotates upward relative to the pivot base is smaller than the resistance force when the movable unit rotates downward relative to the pivot base.

[0010] Furthermore, this invention is a monitor holder for which a monitor is attached, The connection unit for connecting to the monitor and the pivot joint according to any one of claims 1 to 7 are included, The present invention provides a monitor holder in which the movable base of the pivot joint is fixed to the connecting unit. [Effects of the Invention]

[0011] The effect of this invention is that by installing a unidirectional rotating member between the pivot base and the central block of the pivot joint, the unidirectional transmission characteristic of the unidirectional rotating member changes the interlocking relationship between the pivot base and the central block. As a result, no frictional force is generated between the end cover and the damper base when raising the monitor, allowing the user to easily raise the monitor, improving the feel of operation, and at the same time reducing wear on parts and extending the service life. [Brief explanation of the drawing]

[0012] [Figure 1] This is a perspective view showing a monitor attached to the first embodiment of the monitor holder of the present invention. [Figure 2] It is a rear view of the first embodiment described above. [Figure 3] It is an exploded perspective view of the parts of the first embodiment described above. [Figure 4] It is an exploded perspective view of viewing FIG. 3 from another angle. [Figure 5] It is an exploded perspective view of the pivot joint parts of the first embodiment described above. [Figure 6] It is an exploded perspective view of the joint unit of the pivot joint of the first embodiment described above. [Figure 7] It is an exploded perspective view of viewing FIG. 6 from another angle. [Figure 8] It is a cross-sectional view taken along line VIII-VIII in FIG. 2. [Figure 9] It is a cross-sectional view taken along line IX-IX in FIG. 2. [Figure 10] It is a diagram showing a state where the inner ring of the one-way rotating member of the joint unit cannot rotate relative to the outer ring. [Figure 11] It is a diagram showing a state where the inner ring of the one-way rotating member can rotate relative to the outer ring. [Figure 12] It is a cross-sectional view similar to FIG. 9, but showing a state where the movable unit of the pivot joint has rotated downward. [Figure 13] It is a cross-sectional view similar to FIG. 9, but showing a state where the movable unit has rotated upward. [Figure 14] (a) and (b) are diagrams showing the operation of rotating the monitor downward. [Figure 15] (a) and (b) are diagrams showing the operation of rotating the monitor upward. [Figure 16] It is a partial exploded view showing the pivot joint of the second embodiment of the monitor holder of the present invention. [Figure 17] It is a cross-sectional view of the pivot joint of the second embodiment described above.

Mode for Carrying Out the Invention

[0013] Before the present invention is described in detail, it should be noted that, where appropriate, reference numerals or the end portion of reference numerals are repeated between figures to indicate corresponding or similar elements, which may optionally have similar characteristics. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used solely for the purpose of distinction and do not imply or suggest relative importance. The present invention will be described in more detail by the following embodiments, but these embodiments are illustrative and should not be construed as limiting the implementation of the present invention. The present invention will be described in detail below.

[0014] Referring to Figures 1 to 3, the first embodiment of the monitor holder of the present invention is used to mount a monitor 9.

[0015] The monitor holder includes a connection unit 100 and a pivot joint 200.

[0016] The connection unit 100 is used to connect to the monitor 9. Although not shown in the diagram, it can be understood that the pivot joint 200 is attached to the arm and is configured to allow the monitor 9 to be rotated or moved arbitrarily in three-dimensional space.

[0017] Referring to Figures 1, 3, and 4, the connection unit 100 includes a connection base 11 and a fixed base 12.

[0018] The connection base 11 is configured to attach the pivot joint 200, and the fixed base 12 is configured to connect the monitor 9.

[0019] The connection base 11 includes a connection plate 111 to which the pivot joint 200 is attached, and a rotating plate 112 that is rotatable relative to the connection plate 111.

[0020] The connecting plate 111 has a mounting groove 113, a central hole 114, and a plurality of locking holes 115. The mounting groove 113 has an open end 116. The central hole 114 surrounds a center line L, and the center line L extends along the front-rear direction X.

[0021] Multiple locking holes 115 surround the outside of the central hole 114. The rotating plate 112 is circular and rotatable relative to the connecting plate 111 with respect to its center line L. The rotating plate 112 has a notch 117 that fits into the open end 116 of the mounting groove 113.

[0022] The fixed base 12 is detachably attached to the connecting base 11. The fixed base 12 also has a plurality of locking grooves 121 and a single fitting plate 122.

[0023] Multiple locking grooves 121 are located at the four corners, and each locking groove 121 is an elongated, slanted opening. The monitor 9 can be fixed to the fixed base 12 through the multiple locking grooves 121.

[0024] The fitting plate 122 is used to insert into the mounting groove 113 when the notch 117 of the rotating plate 112 is aligned with the open end 116 of the mounting groove 113, thereby facilitating the attachment of the fixed base 12 to the connecting base 11.

[0025] After inserting the fitting plate 122 into the mounting groove 113, the rotating plate 112 is rotated so that the notch 117 of the rotating plate 112 moves away from the open end 116 of the mounting groove 113, and the open end 116 is closed by the rotating plate 112, allowing the fixing base 12 to be fixed to the connecting base 11.

[0026] The pivot joint 200 is attached to the connection base 11 of the connection unit 100 along the front-rear direction X. The pivot joint 200 also includes a coupling unit 3 and a movable unit 4 attached to the coupling unit 3.

[0027] Referring to Figures 4 to 6, the joint unit 3 is intended to be attached to the arm. The joint unit 3 also includes a pivot base 31, a central block 32, a unidirectional rotating member 33, and two damper bases 34.

[0028] The pivot base 31 has a generally cylindrical cylinder 311 and two extension arms 312 extending from the cylinder 311. The cylinder 311 defines a storage tank 313 and a positioning groove 314.

[0029] The storage tank 313 surrounds axis C, which extends along the left-right direction Y and is substantially perpendicular to the center line L (see Figure 3).

[0030] Referring to Figures 4 and 7, the positioning groove 314 is formed on the outer surface of the cylinder 311 and is formed in an arc shape so as to surround the axis C.

[0031] The positioning groove 314 is located on opposite sides in the vertical direction Z. Two extension arms 312 are located on opposite sides in the vertical direction Z and are configured to engage with the arms.

[0032] Referring to Figures 6 to 8, the central block 32 is installed in the storage tank 313 along axis C. Furthermore, the central block 32 has a circular portion 321 and two non-circular portions 322 connected to opposite sides of the circular portion 321 along the left-right direction Y.

[0033] The central block 32 further has an axial hole 323 that surrounds the axis C.

[0034] Referring to Figures 7 to 9, the unidirectional rotating member 33 is installed between the pivot base 31 and the central block 32, and is fitted into the circular portion 321 of the central block 32.

[0035] In this embodiment, the unidirectional rotating member 33 is a unidirectional needle roller bearing, its outer ring is fixed to the pivot base 31, and its inner ring is fixed to the central block 32.

[0036] When the inner ring of the unidirectional rotating member 33 is rotatable relative to the outer ring, the central block 32 becomes rotatable relative to the pivot base 31. When the inner ring of the unidirectional rotating member 33 is not rotatable relative to the outer ring, the central block 32 is rigidly connected to the pivot base 31, enabling torque transmission and providing unidirectional power transmission.

[0037] Referring to Figures 6 to 8, the two damper bases 34 are each fixed to two non-circular portions 322 of the central block 32 and are adjacent to the unidirectional rotating member 33 in the left-right direction Y.

[0038] Each damper base 34 includes a seat 341, an inner ring 342 installed on the seat 341 and surrounding the axis C, and an outer ring 343 installed on the seat 341 and surrounding the outside of the inner ring 342 at a distance from the outside of the inner ring 342.

[0039] The seat body 341 has non-circular grooves 344 on opposite sides in the left-right direction Y, on the inner ring 342 side and the outer ring 343 side. The non-circular grooves 344 fit into the non-circular portion 322 of the central block 32, thereby fixing the damper base 34 to the central block 32.

[0040] Each damper base 34 further defines a circular hole 345 surrounding the axis C. The circular hole 345 is spatially in communication with the non-circular tank 344.

[0041] The inner ring 342 has a first contact surface 346 that surrounds the axis C, and a second contact surface 347 that surrounds the outside of the first contact surface 346.

[0042] In this embodiment, the shape of the inner ring 342 is conical, and the first contact surface 346 is a conical surface that gradually narrows toward the axis C, while the second contact surface 347 is a conical surface that gradually widens toward the axis C.

[0043] The outer ring 343 has a third contact surface 348 that surrounds the outside of the second contact surface 347. The third contact surface 348 is a conical surface that gradually narrows toward the axis C.

[0044] Referring to Figures 4, 5, and 8, the movable unit 4 is configured to have the joint unit 3 attached and is fixed to the connecting unit 100.

[0045] The movable unit 4 is rotatable in the vertical direction Z relative to the pivot base 31, thereby allowing adjustment of the oscillation angle of the movable unit 4 in the vertical direction (i.e., the vertical direction Z).

[0046] The movable unit 4 includes a movable base 41, two end covers 42, a central rod 43, and a vertically oscillating positioning rod 44.

[0047] The movable base 41 is fixed to the connecting base 11, screwed into a plurality of locking holes 115 of the connecting plate 111, and rotatable relative to the pivot base 31.

[0048] Furthermore, the movable base 41 is generally U-shaped. The movable base 41 has a base wall 411 and two side walls 412 formed on opposite sides of the base wall 411. The base wall 411 has a fixing hole 413 that extends along the front-rear direction X.

[0049] Each of the two side walls 412 is in contact with the damper base 34. Each side wall 412 also has a mounting hole 414.

[0050] The two end covers 42 are mounted on the movable base 41 with a gap in the left-right direction Y, and are in contact with the two damper bases 34 so that each can rub against each of the two damper bases 34. The two end covers 42 are each attached to the two side walls 412.

[0051] Each end cover 42 includes a main wall 421 whose shape conforms to the corresponding side wall 412, an inner enclosure wall 422 extending from the main wall 421 and passing through the respective mounting holes 414, and an outer enclosure wall 423 that surrounds the outside of the inner enclosure wall 422 at a distance from the outside of the inner enclosure wall 422 and passes through the respective mounting holes 414.

[0052] Both the inner wall 422 and the outer wall 423 surround the axis C. Each end cover 42 further defines an opening 424 that surrounds the axis C. The inner wall 422 has a first friction surface 425 that surrounds the axis C.

[0053] The outer wall 423 has a second friction surface 426 surrounding the axis C and a third friction surface 427 surrounding the outside of the second friction surface 426.

[0054] In this embodiment, the shape of both the inner wall 422 and the outer wall 423 is conical, and the first friction surface 425, the second friction surface 426, and the third friction surface 427 are all conical surfaces.

[0055] The first friction surface 425 is rotatably in contact with the first contact surface 346 of the corresponding damper base 34 so as to be able to rub against it, the second friction surface 426 is in contact with the corresponding second contact surface 347 so as to be able to rub against it, and the third friction surface 427 is in contact with the corresponding third contact surface 348 so as to be able to rub against it.

[0056] This generates friction between the end cover 42 and the damper base 34, allowing the monitor 9 (see Figure 1) to move or stop, while preventing the monitor 9 from sagging.

[0057] In this embodiment, the double annular design of each end cover 42 and each damper base 34 increases the friction area and generates a greater frictional force, thereby enabling the support of a heavier monitor 9.

[0058] The central rod 43 is installed along axis C, passing through two end covers 42, a movable base 41, and a prefix unit 3. Specifically, the central rod 43 is inserted into the openings 424 of the two end covers 42 and the axial hole 323 of the central block 32, with one end of the central rod 43 screwed into one of the end covers 42.

[0059] The central rod 43 does not substantially contact the central block 32. A spring washer is provided between the head of the central rod 43 and the adjacent end cover 42.

[0060] Referring to Figures 4 and 9, the vertically oscillating positioning rod 44 is screwed into the fixing hole 413 of the movable base 41 and the central hole 114 of the connecting plate 111, and is positioned so that a portion of it extends into the positioning groove 314.

[0061] The vertical oscillation positioning rod 44 can slide relative to the upper and lower ends of the positioning groove 314, thereby limiting the vertical oscillation angle of the movable unit 4 and preventing the monitor 9 (see Figure 1) from rising or falling excessively.

[0062] Referring to Figures 10 and 11, the torque transmission method when the movable unit 4 rotates relative to the pivot base 31 will be explained.

[0063] For ease of explanation, the connecting unit 100 is shown with a dashed line, and in the figure, moving parts, including the joint unit 3 and the movable unit 4, are filled in gray, while non-moving parts are not filled in.

[0064] Figure 10 shows the state in which the inner ring of the unidirectional rotating member 33 cannot rotate relative to the outer ring (i.e., locked state). The central block 32 is rigidly connected to the pivot base 31 via the unidirectional rotating member 33, and the central block 32 and the pivot base 31 do not rotate relative to each other.

[0065] The two damper bases 34 are constrained by the central block 32 and cannot rotate. The parts that rotate during torque transmission are the movable base 41, the two end covers 42, the central rod 43, and the vertically oscillating positioning rod 44.

[0066] A frictional force is generated between the two end covers 42 and the two damper bases 34 due to relative rotation. This frictional force prevents the movable unit 4 from rotating downward, thus preventing the monitor 9 (see Figure 1) from sagging due to its own weight.

[0067] Figure 11 shows the state in which the inner ring of the unidirectional rotating member 33 is rotatable relative to the outer ring (i.e., the state of free rotation).

[0068] The central block 32 is rotatable relative to the pivot base 31, and when torque is transmitted, the movable base 41, the two end covers 42, the central rod 43, the vertical oscillation positioning rod 44, the damper base 34, and the central block 32 all rotate.

[0069] At this time, the end cover 42 and the damper base 34 operate in sync, and no frictional force is generated.

[0070] Referring to Figures 12 and 13, when the connecting unit 100 rotates, the movable unit 4 rotates up and down in the vertical direction Z relative to the pivot base 31, and the elevation angle of the monitor 9 (see Figure 1) is adjusted.

[0071] Referring together to Figures 8, 12, 14(a) and (b), when the monitor 9 is pushed down to rotate downwards, the inner ring of the unidirectional rotating member 33 cannot rotate relative to the outer ring. Therefore, by overcoming the frictional force between the end cover 42 and the damper base 34, the movable unit 4 can be rotated downwards relative to the pivot base 31.

[0072] Therefore, the downward force must overcome the frictional force between the end cover 42 and the damper base 34, in addition to the weight of the monitor 9. When the vertically oscillating positioning rod 44 reaches the lower end of the positioning groove 314 while the movable unit 4 is rotating downward, it can no longer be pushed down further.

[0073] Referring together to Figures 8, 13, 15(a) and (b), when the monitor 9 is rotated upward, the inner ring of the unidirectional rotating member 33 can rotate relative to the outer ring, allowing the central block 32 and the pivot base 31 to rotate relative to each other.

[0074] Therefore, no frictional force is generated between the end cover 42 and the damper base 34, and the upward force only needs to overcome the weight of the monitor 9. Consequently, the resistance when rotating the monitor 9 upward is smaller than the resistance when pushing the monitor 9 downward, making it easier to operate.

[0075] Therefore, the resistance force when the movable unit 4 rotates upward relative to the pivot base 31 is smaller than the resistance force when the movable unit 4 rotates downward relative to the pivot base 31.

[0076] Referring to Figures 16 and 17, the second embodiment of the present invention is similar to the first embodiment, but differs in the following respects.

[0077] Each damper base 34 has a single ring design and includes a seat 341 and an inner ring 342 provided on the seat 341.

[0078] The seat body 341 has a non-circular groove 344 on the side opposite to the inner ring 342 in the left-right direction Y. The shape of the inner ring 342 is cylindrical and has a first contact surface 346 which is a conical surface.

[0079] Each end cover 42 has a single ring design. Each end cover 42 also includes a main wall 421 and an inner enclosure wall 422 extending from the main wall 421.

[0080] The inner wall 422 has a cylindrical shape and a first friction surface 425. The first friction surface 425 is a conical surface and is in contact with the first contact surface 346 so as to be able to rub against it.

[0081] In this embodiment as well, a frictional force can be generated between the end cover 42 and the damper base 34.

[0082] As described above, in the monitor holder of this invention, a unidirectional rotating member 33 is installed between the pivot base 31 and the central block 32. Due to the characteristic of the unidirectional rotating member 33 to transmit power only in one direction, the interlocking relationship between the pivot base 31 and the central block 32 is changed, and when raising the monitor 9, no frictional force is generated between each end cover 42 and each damper base 34. Therefore, the resistance when rotating the movable unit 4 upward relative to the pivot base 31 is smaller than the resistance when rotating the movable unit 4 downward relative to the pivot base 31.

[0083] This allows the user to easily raise the monitor 9, resulting in less effort and improved operability. At the same time, it reduces frictional wear between the end cover 42 and the damper base 34, extending the lifespan of the equipment and thus reliably achieving the objectives of this invention.

[0084] The above embodiments are illustrative in illustrating the principles and effects of the present invention and do not limit it. Those skilled in the art can make some modifications and alterations to the above embodiments, provided they do not deviate from the spirit and scope of the present invention. Therefore, all modifications and alterations made by those skilled in the art, provided they do not deviate from the spirit of the present invention, should also be considered to fall within the scope of protection of the present invention. [Industrial applicability]

[0085] The monitor holder and its pivot joint according to this invention are suitable for holding a monitor. [Explanation of symbols]

[0086] 100 connection units 11 Connection Base 111 Connection Plate 112 Rotating Plates 113 Installation tank 114 Center hole 115 lock holes 116 Open end 117 Notches 12 Fixed base 121 Lock groove 122 Mating Plate 200 Pivot Joint 3. Joint Unit 31 Pivot Base 311 Cylinder 312 Extension Arm 313 Storage Tank 314 Positioning groove 32 Central Block 321 Circular section 322 Non-circular section 323 Shaft hole 33 Unidirectional rotating member 34 Damper Base 341 Seat 342 Inner Ring 343 Outer ring 344 Non-circular tanks 345 Round hole 346 First contact surface 347 Second contact surface 348 Third contact surface 4 Movable Units 41 Movable base 411 Base wall 412 Side wall 413 Fixing hole 414 mounting holes 42 End cover 421 Main wall 422 Inner wall 423 External wall 424 Open hole 425 First friction surface 426 Second friction surface 427 Third friction surface 43 Center rod 44 Vertical oscillating positioning rod 9 monitors L center line C axis Z vertical direction Y left / right direction X Anteroposterior direction

Claims

1. A pivot joint for a monitor holder that can swing vertically, comprising a joint unit and a movable unit, The aforementioned joint unit includes a pivot base, a central block, a unidirectional rotating member, and two damper bases. The pivot base has a housing tank surrounding the axis, The central block is installed in the storage tank along the axis and has a circular portion and two non-circular portions connected to opposite sides of the circular portion in the left-right direction. The aforementioned axis extends in the left-right direction, The unidirectional rotating member is installed between the pivot base and the central block and is fitted into the circular portion of the central block. The two damper bases are each fixed to the two non-circular portions of the central block and are adjacent to the unidirectional rotating member. Each of the damper bases has a first contact surface surrounding the axis, The movable unit is configured to be attached to the joint unit and is rotatable in the vertical direction relative to the pivot base. The movable unit includes a movable base rotatable relative to the pivot base, two end covers mounted on the movable base at intervals in the left-right direction and in contact with the two damper bases so as to be able to rub against each of the two damper bases, and a central rod installed along the axis through the two end covers, the movable base and the joint unit. Each of the end covers has a first friction surface that surrounds the axis and is rotatably in contact with the corresponding first contact surface so as to be able to rub against it. A pivot joint for a monitor holder, wherein the resistance force when the movable unit rotates upward relative to the pivot base is less than the resistance force when the movable unit rotates downward relative to the pivot base.

2. Each of the end covers includes an inner wall surrounding the axis and an outer wall that surrounds the outside of the inner wall at a distance from the outside of the inner wall. The inner wall has the first friction surface formed therein. The outer wall has a second friction surface surrounding the axis and a third friction surface surrounding the outside of the second friction surface. Each damper base includes an inner ring surrounding the axis and an outer ring that surrounds the outside of the inner ring at a distance from the outside of the inner ring. The inner ring has a first contact surface and a second contact surface that surrounds the outside of the first contact surface and is in contact with the second friction surface so as to be able to rub against it. The pivot joint for a monitor holder according to claim 1, wherein the outer ring has a third contact surface that surrounds the outside of the second contact surface and is in contact with the third friction surface so as to be able to rub against it.

3. The pivot joint for a monitor holder according to claim 2, wherein the shape of the inner wall, the outer wall, and the inner ring are all conical.

4. The pivot joint for a monitor holder according to claim 1, wherein both the first friction surface and the first contact surface are conical surfaces.

5. Each damper base includes an inner ring surrounding the axis, The inner ring has a cylindrical shape, and the first contact surface is formed on the inner ring. Each of the end covers includes an inner wall surrounding the axis, The pivot joint for a monitor holder according to claim 1, wherein the shape of the inner wall is cylindrical, and the first friction surface is formed on the inner wall.

6. The movable unit further includes a vertically oscillating positioning rod installed on the movable base, The pivot base further has a positioning groove on which the vertically swinging positioning rod can slide, The pivot joint for the monitor holder according to claim 1, wherein both ends of the positioning groove are installed on opposite sides in the vertical direction.

7. The pivot base comprises a cylinder defining the storage tank and two extension arms extending from the cylinder, The pivot joint for the monitor holder according to claim 6, wherein the positioning groove is formed in an arc shape on the outer surface of the cylinder so as to surround the axis.

8. A monitor holder on which a monitor can be attached, The connection unit for connecting to the monitor and the pivot joint according to any one of claims 1 to 7 are included. A monitor holder in which the movable base of the pivot joint is fixed to the connecting unit.

9. The connection unit includes a connection base and a fixed base, The connection base is configured for the attachment of the pivot joint, The monitor holder according to claim 8, wherein the fixed base is configured for the connection of the monitor and is detachably attached to the connection base.

10. The monitor holder according to claim 9, wherein the connecting base comprises a connecting plate configured for mounting the pivot joint and a rotating plate rotatable relative to the connecting plate.

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