TWM628374U - Foldable screen stand - Google Patents

Abstract

The invention relates to a foldable screen stand, which includes a base, a support arm, a second pivot mechanism, a pitch adjustment arm and a first pivot mechanism. The second pivot mechanism is connected to the base and the support arm, and the first pivot mechanism is connected to the support arm and the pitch adjustment arm. The first rotating shaft mechanism has a first mandrel, a first control rod and a first locking piece. The first control rod slidably passes through the first spindle, the first locking piece is arranged on the first control rod, and the first locking piece can slide to a second locking position along with the first control rod to limit the support arm and pitch adjustment The relative rotation angle range of the arm. When the first locking piece and the locking piece of the second pivot mechanism are released from the locking position, the support arm and the pitch adjustment arm can be folded on the back of a display body, thereby greatly reducing the volume of the stand.

Description

Foldable screen stand

This creation relates to a component for composing a screen, especially a foldable screen stand.

Currently commercially available LCD screens can be roughly divided into a display body and a bracket; the display body is a flat plate with a liquid crystal panel arranged therein; the bracket is installed on the back of the display body so that the display body can be placed on the desktop. A pitch adjustment mechanism is usually provided on the bracket to allow consumers to fine-tune the pitch angle of the display body by themselves.

Many consumers have special requirements for the stand of the LCD screen, for example, to be able to adjust the height, to be able to float on the desktop and to move left and right, or to directly fix the LCD screen on the wall, etc. The current LCD screen bracket cannot meet the needs of all consumers, so the bracket is usually designed to be detachable, and the VESA standard installation interface (4 screw holes, set according to a specific spacing) is set on the back of the display body. When there are special needs, you need to remove the standard bracket by yourself, and then fix the display body on the special bracket purchased by yourself through the VESA interface.

However, it is very troublesome to disassemble the stand by itself, and the disassembled stand is also difficult to store due to its large size and special shape, which is inconvenient for consumers to use.

In addition, because the existing bracket has only one pitch adjustment mechanism, and the pitch adjustment mechanism can only be used to fine-tune the pitch angle, the existing bracket is bulky and difficult to store. In order to enable the LCD screen to be stored in a smaller box during the warehousing and logistics stage, the display body and the bracket need to be separated, and the complete LCD screen can be assembled by themselves after the consumer receives it, but this is very important for consumers. It is troublesome, and the separated bracket itself is still bulky and takes up space.

Therefore, the prior art screen stand needs to be improved.

In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a foldable screen stand, which can be folded and folded on the back of the display body of the screen, so as to greatly reduce the volume and facilitate use.

In order to achieve the above-mentioned creation purpose, the technical means used in this creation is to design a foldable screen stand, which is used to connect a display body, and the screen stand includes: a pitch adjustment arm, one end of which is a connecting end of the display body, and the connecting end of the display body is used for connecting the display body; a support arm, and a first deployment limit slot is formed on the support arm or the pitch adjustment arm; A first pivot mechanism, which connects the support arm and the pitch adjustment arm, the first pivot mechanism has: a first mandrel, which passes through the support arm and the pitch adjustment arm, so that the pitch adjustment arm and the support arm are rotatably connected; a first control rod coaxially and slidably penetrating the first mandrel; a first locking piece, which is arranged on the first control rod; the first locking piece can pass through the first expansion limit slot or be separated from the first expansion limit slot along with the sliding of the first control rod; when the first control rod slides When the first locking member passes through the first deployment limiting slot, the first locking member restricts the relative rotation angle range of the support arm and the pitch adjusting arm; when the first locking member is separated from the first deployment limiting slot, The support arm and the pitch adjustment arm can freely rotate relative to each other; a base, a second expansion limiting slot is formed on the base or the support arm; A second shaft mechanism, which connects the base and the support arm, the first shaft mechanism has: a second mandrel, which passes through the base and the support arm, so that the base and the support arm are rotatably connected; a second lever coaxially and slidably extending through the second spindle; a second locking piece, which is arranged on the second control rod; the second locking piece can pass through the second expansion limit slot or be separated from the second expansion limit slot when the second control rod slides; when the second control rod slides When the second locking member passes through the second deployment limiting slot, the second locking member restricts the relative rotation angle range of the base and the support arm; when the second locking member is separated from the second deployment limiting slot, the second locking member The base and the support arm can freely rotate relative to each other.

The screen bracket of the present invention can be assembled together with a display body to form a liquid crystal screen. At this time, the display body is fixed on the connecting end of the display body of the adjusting arm. In the normal use state, the first locking piece of the first hinge mechanism passes through the first expansion limit slot, while the second lock piece of the second hinge mechanism passes through the second expansion limit slot. At this time, the base, the support arm and the The pitch adjustment arm will be restricted in the unfolded state by the first locking member, namely the second locking member, the display body can be placed on the desktop through the present invention, and consumers are allowed to fine-tune the pitch angle of the display body by themselves.

When the screen stand is not in use, the consumer can operate the second lever and the first lever (for example, press one end of the second lever and the first lever) to disengage the second locking member from the first locking member The limit groove of the base, the support arm and the pitch adjustment arm can be relatively rotated to a folded state in a large range; in the folded state, the base, the support arm and the pitch adjustment arm are roughly parallel to each other, so that the support Folded on the back of the display body.

The advantages of this creation are as follows:

First, the screen bracket has a second hinge mechanism and a first hinge mechanism. The second lever and the second locking member of the second hinge mechanism enable the base and the support arm to rotate and fold with each other. At the same time, the first control of the first hinge mechanism The rod and the first locking piece enable the support arm and the pitch adjustment arm to rotate and fold with each other. Compared with the existing stand that only has one pitch adjustment mechanism, the present invention has two pivot mechanisms, so that the stand can be completely folded on the back of the display body to greatly reduce the volume of the stand. Therefore, when the user wants to fix the display body on a special bracket purchased by himself, the original bracket does not need to be stored separately from the display body, which is more convenient for consumers.

Second, to continue, when the screen is in the storage and logistics stage, as long as the bracket is folded on the back of the display body, the overall volume of the screen can be greatly reduced. Therefore, the bracket does not need to be separated from the display body when the screen is shipped. Consumers receive It can be used directly behind the screen without self-assembly, which is more convenient to use.

Third, by designing the control rod to pass through the corresponding mandrel, the rotating shaft mechanism of the present invention can use most of the components of the existing pitch adjustment mechanism in a large number, and thus can obtain a significant effect without greatly increasing the cost. promote.

Further, in the foldable screen stand, wherein the first expansion limit slot is formed on the pitch adjustment arm; the first control rod of the first pivot mechanism passes through the support arm in a non-rotatable manner. first mandrel.

Further, in the foldable screen stand, the first mandrel of the first hinge mechanism can pass through the support arm in a non-rotatable manner; the first mandrel can pass through the pitch adjustment in a relatively rotatable manner arm; the first control rod of the first pivot mechanism passes through the first mandrel in a non-rotatable manner.

Further, in the foldable screen stand, the cross section of the first mandrel is non-circular; a first mandrel hole is formed through the support arm, and the first mandrel hole is non-circular ; The first mandrel passes through the first mandrel hole on the support arm; The first locking piece is non-rotatably provided at one end of the first control rod; The first rotating shaft mechanism further has a first positioning piece , which is non-rotatably sleeved with the first mandrel; a first positioning chute is formed on the first positioning piece, and the first positioning chute is sleeved with the first locking piece so that the first control rod cannot be relative to the first control rod. A mandrel turns.

Further, in the foldable screen stand, a first foldable fixing slot is formed on the support arm or the tilting arm, and the first foldable fixing slot and the first unfolding limiting slot are formed in the on the same element, and the first folding fixing slot and the first unfolding limiting slot are arranged at a surrounding interval; the first locking piece can pass through the first folding fixing slot or be separated from the first foldable fixing slot with the sliding of the first control rod a first folding fixing slot; when the first locking piece passes through the first folding fixing slot, the first locking piece prevents the support arm and the pitch adjusting arm from rotating relative to each other; when the first locking piece is disengaged from the first folding fixing slot When the first fixing slot is folded, the support arm and the pitch adjustment arm can freely rotate relative to each other.

Further, in the said foldable screen stand, wherein the first hinge mechanism further has a first elastic member, which drives the first locking member so that the first locking member tends to pass through the in the first expansion limiting groove.

Further, in the foldable screen stand, the first hinge mechanism further has a first elastic member, which pushes against the first locking member; when the pitch adjustment arm rotates to a pitch relative to the support arm When the angle is unfolded, the push of the first elastic piece makes the first locking piece tend to pass through the first unfolding limiting slot; when the pitch adjusting arm rotates relative to the support arm to a pitch folded angle, the The pushing of an elastic piece makes the first locking piece tend to pass through the first folding fixing groove.

Further, in the foldable screen stand, the first hinge mechanism further has a pitch resistance generator, which is disposed at the connection between the support arm and the pitch adjustment arm, and the pitch resistance generator makes the pitch resistance generator The pitch adjustment arm can be fixed at any angle relative to the support arm; the first mandrel and the first control rod pass through the pitch resistance generator.

Further, in the foldable screen stand, the first locking member of the first hinge mechanism has a main body, which is annular and sleeves the first control rod in a non-rotatable manner relative to the support arm; a limiting portion protruding from the periphery of the main body and extending along the axial direction of the first mandrel; wherein, the limiting portion of the first locking member can slide through the first control rod A deployment limiting slot or disengagement from the first deployment limiting slot.

The technical means adopted by the present creation to achieve the predetermined creation purpose are further described below in conjunction with the drawings and preferred embodiments of the present creation.

Please refer to FIG. 1 to FIG. 3 , the foldable screen stand of the present invention includes a pitch adjustment arm 10 , a support arm 20 , a first pivot mechanism 30 , a base 40 and a second pivot mechanism 50 .

One end of the aforementioned pitch adjustment arm 10 is a display body connecting end 11, and the display body connecting end 11 is used to connect the display body A of a screen. Group.

A first unfolding limiting slot 12 and a first folding fixing slot 13 are recessed on the pitch adjusting arm 10 . The first folding fixing slot 13 and the first unfolding limiting slot 12 surround a connection on the pitch adjusting arm 10 . The holes 14 (shown in Figure 3) are spaced apart. The first folding fixing slot 13 and the first unfolding limiting slot 12 are preferably formed on a ring side of the pitch adjusting arm 10 .

Specifically, the aforementioned support arm 20 is generally a plate shape, and a first mandrel hole 21 (as shown in FIG. 3 ) is formed through the top of the support arm 20 , and the first mandrel hole 21 is preferably non-circular .

The aforementioned first pivot mechanism 30 is connected to the support arm 20 and the pitch adjustment arm 10. The first pivot mechanism 30 has a first spindle 31, a first control rod 32, and a first locking member 33; and in this embodiment , and further has a first positioning piece 34 , a first elastic member 35 and a pitching resistance generator 36 .

The first mandrel 31 is a hollow shaft, which passes through the first mandrel hole 21 of the support arm 20 and the connection hole 14 of the pitch adjustment arm 10 to connect the support arm 20 and the pitch adjustment arm 10 rotatably. The cross section of the first mandrel 31 is preferably non-circular, so that the first mandrel 31 can pass through the support arm 20 in a non-rotatable manner, and at the same time, the first mandrel 31 can pass through the pitch adjustment arm 10 relatively rotatably. In other words, the first mandrel 31 is fixed to the support arm 20 , and the pitch adjustment arm 10 can be rotated by the first mandrel 31 .

The pitch resistance generator 36 , also often referred to as a torque generator, is provided at the connection between the support arm 20 and the pitch adjustment arm 10 . The pitch resistance generator 36 enables the pitch adjustment arm 10 to be fixed at any angle relative to the support arm 20 . . Specifically, the pitch resistance generator 36 includes a plurality of annular sheets arranged in sequence and rubbing against each other. The annular sheets are respectively disposed on the support arm 20 and the pitch adjustment arm 10 and are penetrated by the first mandrel 31 . . The pitch resistance generator 36 can generate frictional force by the friction between the annular sheets, so that the pitch adjustment arm 10 can be fixed at any angle relative to the support arm 20 .

Please refer to FIG. 3 , FIG. 5 and FIG. 6 , the first control rod 32 coaxially and slidably penetrates the hollow of the first mandrel 31 , whereby the first control rod 32 penetrates through each ring of the pitch resistance generator 36 flakes. The opposite ends of the first control lever 32 are a first manual operation end 321 and a connection end 322 respectively. The first manual operation end 321 is preferably button-shaped for consumers to press and operate, and the cross section of the connection end 322 is relatively small. Desirably non-circular.

The first locking member 33 is fixed on the connecting end 322 of the first control rod 32. The first locking member 33 has a main body 331 and a limiting portion 332; the main body 331 is annular and forms a central hole 333; the limiting portion 332 is a The elongated and protruding shape is formed on the periphery of the main body 331 and extends in the axial direction of the first mandrel 31 . The central hole 333 is preferably non-circular, and the first locking member 33 is sleeved with the connecting end 322 of the first control rod 32 through the central hole 333, so that the first locking member 33 cannot be relatively rotatably disposed on the first manual operation end 321.

The first positioning piece 34 is non-rotatably sleeved with the first mandrel 31 . A positioning chute 341 is formed on the first positioning piece 34 . The positioning chute 341 is slidably sleeved with the limiting portion 332 of the first locking member 33 so that the first locking member 33 cannot rotate relative to the first mandrel 31 . Restrict the relative rotation of the first control rod 32 and the first mandrel 31 ; that is, by passing the first locking member 33 to connect the first positioning piece 34 , the first control rod 32 can slide but cannot be relative to the support arm 20 The first mandrel 31 is rotatably passed through.

The first elastic member 35 is preferably a compression spring, which pushes against the first locking member 33 along the axial direction of the first mandrel 31 .

Please refer to FIG. 3 , FIG. 5 and FIG. 6 , when the pitch adjustment arm 10 and the support arm 20 are relatively rotated to a pitch angle α (as shown in FIG. 6 ), the limiting portion 332 of the first locking member 33 will be aligned with the first deployment limit slot 12 of the pitch adjustment arm 10 , and the axial push of the first elastic member 35 will drive the first locking member 33 and the first control rod 32 to move together, thereby causing the limit portion 332 to move together. It can move axially to pass through the first expansion limiting slot 12 . When the limiting portion 332 of the first locking member 33 passes through the first deployment limiting slot 12 , the relative rotation of the pitch adjusting arm 10 and the support arm 20 will cause the limiting portion 332 to abut against the end of the first deployment limiting slot 12 , thereby limiting the relative rotation angle range of the support arm 20 and the pitch adjustment arm 10 , so that the support arm 20 and the pitch adjustment arm 10 can only fine-tune the pitch angle of the display body A within a small range. The pushing of the first elastic member 35 makes the limiting portion 332 of the first locking member 33 tend to pass through the first deployment limiting slot 12 and not easily escape from the first deployment limiting slot 12 .

Specifically, when the limiting portion 332 of the first locking member 33 passes through the first deployment limiting slot 12 , the angular range over which the support arm 20 and the pitch adjustment arm 10 can rotate relative to each other is about 30 degrees, and this angular range is The pitch angle adjustment range of the conventional monitor stand. The pitch resistance generator 36 can fix the support arm 20 and the pitch adjustment arm 10 at any angle after adjustment.

When the first locking member 33 is disengaged from (ie not penetrated) the first deployment limiting slot 12 , the support arm 20 and the pitch adjusting arm 10 can freely rotate relative to each other at a large angle with the first spindle 31 as the axis.

Please refer to FIG. 7 and FIG. 8 , when the tilt adjustment arm 10 and the support arm 20 are relatively rotated to a tilt angle β (as shown in FIG. 7 ), the limiting portion 332 of the first locking member 33 will The first folded fixing groove 13 of the quasi-tilt adjustment arm 10, at this time, the axial push of the first elastic member 35 will drive the first locking member 33 and the first control rod 32 to move together, thereby making the first locking member 33 move. The limiting portion 332 passes through the first folding fixing slot 13 , and at this time, the first locking member 33 prevents the support arm 20 and the pitch adjusting arm 10 from rotating relative to each other. Specifically, the width of the first folding fixing groove 13 is substantially the same as the width of the limiting portion 532 , so that the support arm 20 and the pitch adjusting arm 10 cannot rotate relative to each other. When the limiting portion 332 passes through the first folding and fixing groove 13 , the support arm 20 is folded and fixed to the rear of the display body A. As shown in FIG.

In this embodiment, the first locking member 33 is equivalent to being linearly slidable but non-rotatably disposed on the support arm 20 , so the first unfolding limiting slot 12 and the first folding fixing slot 13 are formed on the pitch adjusting arm 10 . In other preferred embodiments, the first locking member 33 can also be designed to be linearly slidable but non-rotatable and disposed on the pitch adjustment arm 10 . At this time, the first unfolding limiting slot 12 and the first folding fixing slot 13 will be formed on the support arm 20. In short, the first unfolding limiting slot 12 and the first folding fixing slot 13 only need to be formed on the same element, that is, the first unfolding limiting slot 12 and the first folding fixing slot 13. The folding and fixing grooves 13 only need to be formed on the support arm 20 or the pitch adjustment arm 10 together.

Please refer to FIG. 2 , FIG. 4 and FIG. 9 , the aforementioned base 40 is generally a flat plate, and a connecting portion 41 is formed protruding from the top surface of the base 40 . A second expansion limiting groove 42 and a second folding fixing groove 43 are concavely formed on a ring side of the connecting portion 41 . The second unfolding limiting slot 42 and the second folding fixing slot 43 are circumferentially arranged at intervals. The bottom surface of the base 40 is provided with a wall-mounted board 44 and a VESA standard installation interface. The VESA standard installation interface in this embodiment is four fixing holes 45 with an interval of 100 mm.

The specific structures of the second rotating shaft mechanism 50 and the first rotating shaft mechanism 30 are substantially the same, and the main difference is that the second rotating shaft mechanism 50 is connected to the base 40 and the support arm 20 . The structure of the second rotating shaft mechanism 50 is briefly described as follows:

The second shaft mechanism 50 has a second spindle 51, a second control rod 52, a second locking member 53; and in this embodiment, further has a second positioning piece 54, a second elastic member 55 and A folding resistance generator 56 .

The second mandrel 51 passes through the base 40 and the support arm 20 so that the base 40 and the support arm 20 are rotatably connected. The second control rod 52 slidably passes through the second spindle 51 , and one end of the second control rod 52 is a second manual operation end 521 . The second locking member 53 is disposed on the second control rod 52 . The second locking member 53 has a main body 531 and a limiting portion 532 . .

The second locking member 53 can pass through the second deployment limiting groove 42 of the base 40 or disengage from the second deployment limiting groove 42 along with the sliding of the second control rod 52 . When the second locking member 53 passes through the second deployment limiting slot 42 , the second locking member 53 limits the relative rotation angle range of the base 40 and the support arm 20 , and the second locking member 53 preferably makes the base 40 rotate. And the support arm 20 cannot rotate relative to each other; when the second locking member 53 is disengaged from the second deployment limiting slot 42 , the base 40 and the support arm 20 can rotate relative to each other freely. Specifically, when the limiting portion 532 passes through the second folding fixing groove 43 , the support arm 20 is folded and fixed above the base 40 .

Please refer to FIG. 1 , FIG. 2 , FIG. 5 and FIG. 8 , when the screen holder is to be folded, the consumer can press the first manual operation end 321 of the first lever 32 to limit the position of the first locking member 33 The portion 332 is disengaged from the first deployment limiting slot 12 (as shown by the phantom line in FIG. 5 ), and the second manual operation end 521 of the second lever 52 is pressed to disengage the second locking member 53 from the second deployment limiting slot 42 Then, the base 40 , the support arm 20 and the pitch adjustment arm 10 can be relatively rotated to a folded state in a large range (as shown in FIG. 8 ). In the folded state, the base 40 , the support arm 20 and the tilt adjustment arm 10 are substantially parallel to each other, so that the bracket is folded on the back of the display body A. As shown in FIG.

After the screen stand is folded, the creation can be hung on the wall W through the wall-mounted plate 44 of the base 40, or it can also be connected to a special stand (not shown in the figure) purchased by consumers through the VESA standard installation interface of the base 40, There is no need to disassemble the original bracket in advance, which is more convenient to use.

To sum up, in the present invention, by arranging the first rotating shaft mechanism 30 and the second rotating shaft mechanism 50 , the first control lever 32 and the first locking member 33 of the first rotating shaft mechanism 30 enable the base 40 and the support arm 20 to be mutually rotatable and retractable. At the same time, the second control lever 52 and the second locking member 53 of the second pivot mechanism 50 enable the support arm 20 and the pitch adjustment arm 10 to rotate and fold with each other, so that the bracket can be completely folded on the back of the display body A. Substantially reduce the size of the stent. Therefore, when the user wants to fix the display body A on a special bracket purchased by himself, the original bracket does not need to be stored separately from the display body A, which is more convenient for consumers.

The above is only the preferred embodiment of the creation, and does not limit the creation in any form. Although the creation has been disclosed as above in the preferred embodiment, it is not intended to limit the creation. Those of ordinary knowledge, within the scope of the technical solution of this creation, can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above. The technical essence of the creation Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the creation.

10: Pitch adjustment arm 11: Display body connection 12: The first expansion limit slot 13: The first folding fixing slot 14: Connection hole 20: Support arm 21: The first mandrel hole 30: The first shaft mechanism 31: The first mandrel 32: The first lever 321: The first manual operation end 322: Connection end 33: First locking piece 331: Subject 332: Limiting part 34: The first positioning piece 341: Positioning chute 35: The first elastic piece 36: Pitch resistance generator 40: base 41: Connection part 42: The second expansion limit slot 43: Second folding fixing slot 44: Wall Mounting Plate 45: Fixing hole 50: Second shaft mechanism 51: Second mandrel 52: Second lever 521: The second manual operation end 53:Second locking piece 531: Subject 532: Limiting part 54: Second positioning piece 55: Second elastic piece 56: Folding resistance generator A: Display body α: Pitch deployment angle β: pitch and fold angle

FIG. 1 is a schematic side view of the present creation and a display body together forming a screen. Figure 2 is a three-dimensional appearance view of this creation. FIG. 3 is an exploded view of the three-dimensional components at the first rotating shaft mechanism of the present invention. FIG. 4 is an exploded view of the three-dimensional components at the second rotating shaft mechanism of the present invention. FIG. 5 is a schematic cross-sectional view of the second rotating shaft mechanism of the present invention. FIG. 6 and FIG. 7 are longitudinal cross-sectional action views of the second rotating shaft mechanism of the present invention. Figure 8 is a schematic side view of the present creation in a folded state. Figure 9 is a bottom view of the base of the present creation.

10: Pitch adjustment arm

11: Display body connection

20: Support arm

30: The first shaft mechanism

321: The first manual operation end

40: base

41: Connection part

50: Second shaft mechanism

521: The second manual operation end

Claims (9)

A foldable screen bracket is used to connect a display body, the screen bracket comprises: a pitch adjustment arm, one end of which is a connecting end of the display body, and the connecting end of the display body is used for connecting the display body; a support arm, and a first deployment limit slot is formed on the support arm or the pitch adjustment arm; A first pivot mechanism, which connects the support arm and the pitch adjustment arm, the first pivot mechanism has: a first mandrel, which passes through the support arm and the pitch adjustment arm, so that the pitch adjustment arm and the support arm are rotatably connected; a first control rod coaxially and slidably penetrating the first mandrel; a first locking piece, which is arranged on the first control rod; the first locking piece can pass through the first expansion limit slot or be separated from the first expansion limit slot when the first control rod slides; when the first control rod slides When the first locking member passes through the first deployment limiting slot, the first locking member restricts the relative rotation angle range of the support arm and the pitch adjusting arm; when the first locking member is separated from the first deployment limiting slot, The support arm and the pitch adjustment arm can freely rotate relative to each other; a base, a second expansion limiting slot is formed on the base or the support arm; A second shaft mechanism, which connects the base and the support arm, the first shaft mechanism has: a second mandrel, which passes through the base and the support arm, so that the base and the support arm are rotatably connected; a second control rod coaxially and slidably penetrating the second mandrel; a second locking piece, which is arranged on the second control rod; the second locking piece can pass through the second expansion limit slot or be separated from the second expansion limit slot when the second control rod slides; when the second control rod slides When the second locking member passes through the second deployment limiting slot, the second locking member restricts the relative rotation angle range of the base and the support arm; when the second locking member is separated from the second deployment limiting slot, the second locking member The base and the support arm can freely rotate relative to each other. The foldable screen stand as claimed in claim 1, wherein The first deployment limiting slot is formed on the pitch adjusting arm; The first control rod of the first rotating shaft mechanism passes through the first mandrel so as not to rotate relative to the support arm. The foldable screen stand as claimed in claim 2, wherein The first mandrel of the first rotating shaft mechanism can pass through the support arm in a relatively rotatable manner; the first mandrel can pass through the pitch adjustment arm in a relatively rotatable manner; The first control rod of the first rotating shaft mechanism passes through the first mandrel in a non-rotatable manner. The foldable screen stand as claimed in claim 3, wherein The cross section of the first mandrel is non-circular; a first mandrel hole is formed through the support arm, and the first mandrel hole is non-circular; the first mandrel passes through the first mandrel on the support arm a mandrel hole; The first locking piece is non-rotatably arranged at one end of the first control rod; The first rotating shaft mechanism further has a first positioning piece, which is sleeved with the first spindle in a non-rotatable manner; a first positioning chute is formed on the first positioning piece, and the first positioning chute is sleeved with the first lock The first control rod cannot rotate relative to the first spindle. The foldable screen stand as claimed in claim 1, wherein A first folding fixing slot is formed on the support arm or the pitch adjusting arm, the first folding fixing slot and the first unfolding limiting slot are formed on the same element, and the first folding fixing slot and the 1. The expansion limit grooves are arranged around the interval; The first locking piece can pass through the first folding fixing slot or be separated from the first folding fixing slot along with the sliding of the first control rod; when the first locking piece passes through the first folding fixing slot, The first locking piece prevents the support arm and the pitch adjusting arm from rotating relative to each other; when the first locking piece is separated from the first folding fixing slot, the support arm and the pitch adjusting arm can freely rotate relative to each other. The foldable screen stand as claimed in any one of claims 1 to 4, wherein the first hinge mechanism further has a first elastic member that drives the first locking member to make the first locking member tend to It is inserted into the first expansion limiting groove. The foldable screen stand as claimed in claim 5, wherein The first rotating shaft mechanism further has a first elastic member, which pushes against the first locking member; When the pitch adjustment arm rotates to a pitch deployment angle relative to the support arm, the pushing of the first elastic member causes the first locking member to tend to pass through the first deployment limiting groove; When the pitch adjustment arm rotates relative to the support arm to a pitch retraction angle, the pushing of the first elastic member causes the first locking member to tend to pass through the first retraction fixing slot. The foldable screen stand of any one of claims 1 to 5, wherein The first pivot mechanism further has a pitch resistance generator, which is arranged at the connection between the support arm and the pitch adjustment arm, and the pitch resistance generator enables the pitch adjustment arm to be fixed at any angle relative to the support arm; The first mandrel and the first control rod penetrate through the pitch resistance generator. The foldable screen stand of any one of claims 1 to 5, wherein The first locking member of the first shaft mechanism has a main body, which is annular and sleeves the first control rod in a non-rotatable manner relative to the support arm; a limiting part, which is formed on the periphery of the main body and extends along the axial direction of the first mandrel; Wherein, the limiting portion of the first locking member can pass through the first expansion limiting slot or be separated from the first expansion limiting slot along with the sliding of the first control rod.

Images