CN214037746U - Intelligent interactive blackboard system - Google Patents

Abstract

The utility model relates to an interactive blackboard system of intelligence, be in including mutual display device and setting the blackboard main part of at least one side in mutual display device's the left and right sides, mutual display device's the back is provided with and is used for fixing mutual display device's fixed knot constructs, the back of blackboard main part is provided with elevating gear, elevating gear is used for the blackboard main part is for mutual display device goes up and down between primary importance and second place, the blackboard main part with mutual display device is less than 3cm at the ascending first interval of horizontal direction. When needs maintain interactive display device or plug wire, the accessible is gone up and down blackboard main part for the height of blackboard main part changes, thereby exposes interactive display device's side, and this side of accessible maintains interactive display device or plug wire, need not to dismantle whole interactive blackboard.

Description

Intelligent interactive blackboard system

Technical Field

The application relates to the field of intelligent interactive blackboards, in particular to an intelligent interactive blackboard system.

Background

The whole immovable string of current intelligent interaction blackboard is on the wall, and when mutual display device on the intelligent interaction blackboard need the plug connection line again or mutual display device takes place to damage and need the maintenance, need take off whole intelligent interaction blackboard whole to handle, and is comparatively troublesome.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an interactive blackboard system of intelligence, mutual display device sets up for the components of a whole that can function independently with the blackboard main part, and the back of blackboard main part is provided with elevating gear, therefore install the back on the wall at the mutual blackboard of whole intelligence, the height of blackboard main part can be adjusted as required for there is the difference in height blackboard main part on the high position with mutual display device, and then exposes at least part with one side of mutual display device, therefore can be convenient maintain mutual display device and plug wire etc..

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an interactive blackboard system of intelligence, is in including mutual display device and setting the blackboard main part of at least one side in mutual display device's the left and right sides, mutual display device's the back is provided with and is used for fixing mutual display device's fixed knot constructs, the back of blackboard main part is provided with elevating gear, elevating gear is used for the blackboard main part for mutual display device goes up and down between primary importance and second place, the second place is higher than the primary importance, when the blackboard main part is in the second place, mutual display device with the at least partial structure of the close one side of blackboard main part exposes, the blackboard main part with mutual display device is less than 3cm at the ascending first interval of horizontal direction.

Optionally, the lifting device includes a wall hanging piece and an extensible piece, a first end of the extensible piece is rotatably connected with the wall hanging piece, a second end of the extensible piece is rotatably connected with the back of the blackboard main body, and a second distance is formed between the first end of the extensible piece and the second end of the extensible piece in the horizontal direction;

when the blackboard main body is positioned at the first position, the resultant force formed by the component force of the force applied by the telescopic piece to the blackboard main body in the vertical direction and the gravity of the blackboard main body is 0 or downward;

when the blackboard main body is located at the second position, the telescopic piece is in an extending state, and the component force of the force applied to the blackboard main body by the telescopic piece in the vertical direction and the resultant force formed by the gravity of the blackboard main body are upward.

Optionally, a limiting structure is arranged on the back of the blackboard main body and used for limiting the blackboard main body to move in the up-down direction.

Optionally, the limiting structure comprises a limiting groove extending in the vertical direction, and a fixing block matched with the limiting groove is arranged on the wall hanging piece.

Optionally, a plurality of sections of sliding rails are arranged between the side surface of the fixed block and the inner wall of the limiting groove, and the number of the sections of the sliding rails is at least 2.

Optionally, the number of the telescopic pieces is 2, and the 2 telescopic pieces are symmetrically arranged relative to the central plane of the blackboard main body in the vertical direction.

Optionally, the telescopic member is a gas spring or an electric telescopic rod.

Optionally, a first hook with a downward opening is arranged on the wall hanging piece and is used for being matched with the strip-shaped wall hanging piece;

the back of the wall hanging piece is fixed with a wall hanging lock hook, and the wall hanging lock hook is provided with a second hook with an upward opening and is used for being matched with the lower edge of the wall hanging piece.

Optionally, a horizontal fixing plate is arranged on the wall hanging piece, a first hole is formed in the fixing plate, a second hole corresponding to the first hole is formed in the wall hanging lock hook, the second hole is a threaded hole, and the first hole and the second hole are connected through a first bolt so that the height of the wall hanging lock hook relative to the wall hanging piece can be adjusted;

the wall-mounted hook is provided with a third hole, the wall-mounted hook is provided with a vertically-arranged elongated hole, and the third hole is connected with the elongated hole through a second bolt so as to limit the wall-mounted hook to move in the vertical direction relative to the wall-mounted hook.

Optionally, the wall hanging piece is further provided with a roller, and when the first hook is matched with the wall hanging piece, the roller is in rolling connection with the upper edge of the wall hanging piece.

The utility model has the advantages that:

the utility model discloses a set up the blackboard main part of liftable in at least one side of mutual display device, when needs maintain or the plug wire mutual display device, accessible lift blackboard main part for the high emergence of blackboard main part changes, thereby exposes mutual display device's side, and this side of accessible maintains or the plug wire mutual display device, need not to dismantle whole mutual blackboard.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is a front view of the present invention;

fig. 2 is a rear view of the present invention;

fig. 3 is a second rear view of the present invention;

FIG. 4 is a schematic view of the structure of the blackboard body and the lifting device;

FIG. 5 is a schematic structural view of the lifting device;

FIG. 6 is a first force-bearing diagram of the first end in the first position;

FIG. 7 is a second force diagram of the first end in the first position;

FIG. 8 is a force diagram of the first end in the second position;

FIG. 9 is an exploded view between the blackboard body and the wall hanging member;

fig. 10 is a schematic structural view of a wall hanger and a wall hook;

fig. 11 is a schematic view of a wall-mounted shackle.

Wherein: 1. an interactive display device; 2. a blackboard main body; 3. a wall hanging piece; 4. a wall hanging piece; 5. a telescoping member; 6. a multi-section slide rail; 7. a wall-mounted latch hook;

21. a limiting groove;

31. a fixed block; 32. a first hook; 33. a roller;

71. a second hook; 72. a first bolt; 73. a second hole; 74. an elongated hole.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, and components have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Referring to fig. 1 and 3, the terms "upper", "lower", "left", "right", and the like in the present invention are used for convenience of description, and do not limit the present invention. Referring to fig. 1, the "up" in the present application refers to a vertical upward direction after the intelligent interactive blackboard is installed on a wall, and vice versa, "down", "left" refers to a left-hand direction when a user looks at the intelligent interactive blackboard, and "right" refers to a right-hand direction.

Referring to fig. 1, an embodiment of the utility model provides an interactive blackboard system of intelligence, including interactive display device 1 and blackboard main part 2, interactive display device 1 sets up for the components of a whole that can function independently with blackboard main part 2, and during the use, interactive display device 1 and blackboard main part 2 all hang on the wall.

The blackboard main body 2 can be located on the left side or the right side of the interactive display device 1, in a specific embodiment, the number of the blackboard main bodies 2 is 2, the 2 blackboard main bodies 2 are respectively located on the left side and the right side of the interactive display device 1, a first distance between the interactive display device 1 and the blackboard main body 2 is usually smaller, generally, the first distance is smaller than 3cm, the preferred first distance is 0cm, that is, the side surface of the blackboard main body 2 is tightly attached to the side surface of the interactive display device 1.

Referring to fig. 1, in a specific embodiment, the blackboard body 2 is rectangular as a whole, the interactive display device 1 is rectangular as a whole, after the interactive display device 1 and the blackboard body 2 are installed on a wall, the height of the blackboard body 2 is equal to that of the interactive display device 1, when the interactive display device is in normal use, the upper plane of the blackboard body 2 is flush with the upper plane of the interactive display device 1, and the lower plane of the blackboard body 2 is flush with the lower plane of the interactive display device 1.

The back of the interactive display device 1 is provided with a fixing structure by which the interactive display device 1 is fixed on a wall, the fixing structure being, for example, a hook, so that the interactive display device 1 can be conveniently hung on the wall hanging member 4.

A lifting device is provided on the back of the blackboard body 2, and the blackboard body 2 is mounted on a wall by the lifting device. Referring to fig. 2 and 3, the lifting device can drive the blackboard main body 2 to move in a vertical direction, and the blackboard main body 2 has 2 positions, namely a first position (shown in fig. 2) and a second position (shown in fig. 3); when the blackboard main body 2 is at the first position, the upper plane of the blackboard main body 2 is flush with the upper plane of the interactive display device 1, the lower plane of the blackboard main body 2 is flush with the lower plane of the interactive display device 1, and the position is the position where the intelligent interactive blackboard system is normally used; when the blackboard body 2 is in the second position, the upper plane of the blackboard body 2 is higher than the upper plane of the interactive display device 1. The second position is higher than the first position, and in the state of the second position, the blackboard main body 2 is higher than the interactive display device 1, and one side of the interactive display device 1 adjacent to the blackboard main body 2 cannot be shielded by the blackboard main body 2, so that when the blackboard main body 2 is adjusted to the second position, the exposed side surface of the interactive display device 1 can be maintained, wired and replaced by an OPS computer and the like.

In the second position, a part of the side surface of the interactive display device 1 may be exposed, and the height of the lower plane of the blackboard body 2 may be higher than the height of the upper plane of the interactive display device 1, so that the entire side surface of the interactive display device 1 is exposed.

Referring to fig. 4 and 5, the lifting device includes a wall hanging member 3 and an extensible member 5, the extensible member 5 may be, for example, a gas spring or an electric extensible rod, the two ends of the extensible member 5 are respectively a first end and a second end, the first end is rotatably connected to the wall hanging member 3, the second end is rotatably connected to the back of the blackboard main body 2, the first end and the second end have a second distance in the horizontal direction, and the second distance is greater than 0 cm.

Taking the telescopic member 5 as an example, because the telescopic member 5 is filled with high-pressure inert gas, the permanent outward-side top forming forces of the first end and the second end of the telescopic member 5 are respectively applied to the blackboard main body 2 and the wall hanging member 3, the forces applied to the blackboard main body 2 and the wall hanging member 3 are equal, and the telescopic length of the telescopic member 5 has little influence on the force applied to the blackboard main body 2 by the telescopic member 5.

In practical application, the wall hanging piece is relatively fixed on a wall. The telescopic elements 5 in the first and second position states will be explained below.

The first position is as follows:

referring to fig. 6, with a horizontal plane passing through the first end as a reference plane, the height of the second end is higher than that of the first end, the angle θ between the axis of the extensible member 5 and the reference plane is small, the component force F1 of the force F of the extensible member 5 acting on the blackboard main body 2 in the vertical direction is upward, the gravity G of the blackboard main body 2 itself is downward, and the resultant force of the gravity G and the component force F1 is 0, so that the blackboard main body 2 can be kept stationary at the first position.

Referring to fig. 7, the height of the second end is equal to or lower than the height of the first end with the horizontal plane passing through the first end as a reference plane, so that the component force of the force F of the extensible member 5 acting on the blackboard body 2 in the vertical direction is 0 or downward, and the resultant force F formed by the component force and the gravity G is downward. In this case, the blackboard body 2 cannot move further downward by other restrictions, and therefore the blackboard body 2 can be held stationary at the first position without an external force.

The second position is as follows:

referring to fig. 8, with the horizontal plane passing through the first end as the reference plane, the height of the second end is higher than that of the first end, the extension piece 5 is in the extended state, the included angle θ between the axis of the extension piece 5 and the reference plane is larger, the component force F1 of the force F of the extension piece 5 acting on the blackboard main body 2 in the vertical direction is upward, and the upward component force F1 is larger than the gravity G of the blackboard main body 2, so the resultant force F formed by the upward component force F1 and the gravity G of the blackboard main body 2 is upward, the extension piece 5 is limited by itself, and the extension piece 5 cannot extend continuously, so the blackboard main body 2 can be kept at the second position without the external force.

Specifically, when the first position is switched to the second position, the user applies an upward acting force to the blackboard main body 2, the acting force is larger than a resultant force F (see fig. 7) when the first position is switched to the second position, the blackboard main body 2 is pushed to move upwards, the height of the second end is increased in the moving process, so that an included angle theta between the axis of the telescopic piece 5 and a reference surface is increased, an upward component force F1 formed by the telescopic piece 5 is increased, the requirement of the acting force applied to the blackboard main body 2 by the user is reduced to 0, the required force of the user in the process of moving the blackboard main body 2 is reduced, and the labor intensity of the user is reduced; on the contrary, when the blackboard main body 2 is moved from the second position to the first position, the height of the second position becomes lower, the upward component force F1 formed by the extensible member 5 becomes smaller, the gravity of the blackboard main body 2 remains unchanged, and the resultant force formed by the upward component force F1 of the extensible member 5 and the gravity of the blackboard main body 2 becomes smaller, so that the downward force required by the user to act on the blackboard main body 2 becomes smaller to 0, and the reduction of the force required in the process is also realized.

Because the expansion piece 5 adopts the gas spring, the gas spring can provide a force constantly to offset the gravity of the blackboard main body 2, thereby being capable of reducing the force required by the blackboard main body 2 in the switching process of the first position and the second position.

The first end and the second end have a second distance in the horizontal direction, the second distance being greater than the length of the telescopic element in the fully compressed state, so that in the first position a height of the second end lower than the first end is achieved. The blackboard main body 2 can be relatively fixed and fixed at the first position.

Referring to fig. 5 and 9, as a preferable scheme, the back of the blackboard main body 2 is provided with a limiting structure, and in the up-and-down movement process of the blackboard main body 2, the limiting structure can limit the movement direction of the blackboard main body 2 to prevent the blackboard main body 2 from inclining.

Specifically, the limiting structure is a limiting groove 21 extending in the vertical direction, and a fixing block 31 matched with the limiting groove 21 is arranged on the corresponding wall hanging piece 3. In the up-and-down movement process of the blackboard main body 2, the position of the fixing block 31 does not change, the limit groove 21 can be limited to shift in the horizontal direction by the fixing block 31, and the phenomenon that the blackboard main body 2 inclines in the up-and-down movement process is further prevented. In a preferred embodiment, the mounting block 31 is vertically elongated.

To reduce the friction between the fixing block 31 and the stopper groove 21, the blackboard body 2 can be smoothly switched between the first position and the second position. A plurality of sliding rails 6 are arranged on the side surface of the fixed block 31 and the inner wall of the limiting groove 21, and the sliding rails 6 are generally applied to a drawer to facilitate the sliding of the drawer. The fixed block 31 and the limiting groove 21 are in rolling friction by arranging the multi-section sliding rail 6.

The number of the multi-section slide rail 6 is at least 2. The preferred number of the multi-section slide rail 6 is 3, and the length of a single section of the multi-section slide rail 6 is shorter as the number of the multi-section slide rail 6 is larger under the same extension stroke, so that the length of the multi-section slide rail 6 can be prevented from being excessively long and extending out of the blackboard body 2 at the first position.

In addition, in the first position, the multi-section slide rails 6 are in a contracted state, resultant force on the blackboard main body 2 is downward, the resultant force acts on the multi-section slide rails, the multi-section slide rails 6 can only extend in one direction, and the multi-section slide rails cannot move downward, so that the blackboard main body 22 can be prevented from moving downward, and the blackboard main body 22 can be kept in the first position without external force.

The quantity of extensible member 5 is preferred 2, and 2 extensible members 5 set up for blackboard main part 2's the ascending central plane symmetry of vertical side, through the extensible member 5 that sets up 2 symmetries for blackboard main part 2 receives the power on the extensible member 5 more balanced, guarantees that blackboard main part 2 is steady to switch between primary importance and second place.

Referring to fig. 10 and 11, the blackboard body 2 is relatively fixed to a wall by a wall hanging member 3, specifically, a strip-shaped wall hanging member 4 is fixed to the wall, and the wall hanging member 3 is hung on the wall hanging member 4. The back of the wall hanging piece 3 is provided with a first hook 32 with a downward opening, the number of the first hooks 32 is 2, and a single wall hanging piece 3 is hung on the wall hanging piece 4 through the 2 first hooks 32; meanwhile, a wall-hanging latch hook 7 is fixed on the back of the wall-hanging member 3, a second hook 71 with an upward opening is arranged on the wall-hanging latch hook 7, and when the first hook 32 is hung on the upper edge of the wall-hanging member 4, the second hook 71 can relatively hook the lower edge of the wall-hanging member 4. In the process that the blackboard main body 2 moves from the first position to the second position, if the upward force applied to the blackboard main body 2 is too large, the first hook 32 and the wall hanging part 4 can be separated, and the second hook 71 can hook the wall hanging part 4 reversely, so that the movement of the wall hanging part 3 relative to the wall hanging part 4 can be limited, the wall hanging part 3 is prevented from being separated from the wall hanging part 4, and the stability of the blackboard main body 2 in the up-and-down moving process is ensured.

Further preferably, a horizontal fixing plate is arranged on the wall hanging piece 3, a first hole is formed in the fixing plate, a second hole 73 corresponding to the first hole is formed in the wall hanging lock hook 7, the second hole 73 is a threaded hole, and a first bolt 72 penetrates through the first hole and is in threaded connection with the second hole 73, so that the purpose that the wall hanging lock hook 7 is relatively fixed on the wall hanging piece 3 is achieved.

Initially, the wall-mounted locking hook 7 is hung on the wall-mounted member 3 through the first bolt 72, at this time, the opening between the first hook 32 and the second hook 71 is greater than the height of the wall-mounted member 4 in the vertical direction, so that after the first hook 32 is hung on the wall-mounted member 4, the wall-mounted member 4 can enter the space between the first hook 32 and the second hook 71 through the opening, and by screwing the first bolt 72, the first bolt 72 drives the wall-mounted locking hook 7 to move, so that the second hook 71 moves towards the first hook 32 in the vertical direction, and the space between the first hook 32 and the second hook 71 becomes smaller until the height of the space is consistent with the height of the wall-mounted member 4, thereby achieving the purpose that the first hook 32 and the second hook 71 simultaneously hook the wall-mounted member 3.

As a further preferred scheme, a third hole is formed in the wall hanging piece 3, a vertically-arranged elongated hole 74 is formed in the wall hanging locking hook 7, and the third hole is connected with the elongated hole 74 through a second bolt. Initially, the wall-mounted latch hook 7 is hung on the wall-mounted member 3 through a second bolt, the second bolt realizes simple and easy fixation of the wall-mounted latch hook 7 and the wall-mounted member 3, the wall-mounted member 3 is hung on the wall-mounted member 4, then the first bolt 72 penetrates through the first hole and is in threaded connection with the second hole 73, the first bolt 72 is screwed to drive the wall-mounted latch hook 7 to move upwards, and the wall-mounted latch hook 7 moves upwards along the direction of the elongated hole 74 until the second hook 71 hooks the lower edge of the wall-mounted member 3.

Certainly, the number of the third holes and the number of the elongated holes 74 are 2, and the 2 third holes correspond to the 2 elongated holes 74 one by one, so that after the wall-hanging latch hook 7 is located on the wall-hanging member 3, the position of the wall-hanging latch hook 7 relative to the wall-hanging member 3 in the left-right direction cannot be changed, and then the first bolt 72 can be matched with the second hole 73.

In an embodiment, the wall hanging member 3 is further provided with a roller 33, and after the first hook 32 is hung on the wall hanging member 4, the roller 33 is in rolling engagement with the upper edge of the wall hanging member 4, thereby facilitating the movement of the blackboard main body 2 in the left-right direction, and particularly pushing the blackboard main body 2 to slide along the wall hanging member 4.

Referring to fig. 2 and 3, in a specific embodiment, the wall-hanging member 4 is long, and the interactive display device 1 and 2 blackboard bodies 2 are hung on the wall-hanging member 4. When the blackboard main body 2 on the left side of the interactive display device 1 is to be moved from the first position to the second position, the blackboard main body 2 is pushed to move a distance leftwards on the wall-hanging piece 4, so that the first distance between the blackboard main body 2 and the interactive display device 1 is increased, the interactive display device 1 is prevented from being collided by the blackboard main body 2 in the process of moving upwards and downwards, and then the blackboard main body 2 is pushed to move upwards to reach the second position.

Those skilled in the art will readily appreciate that the above-described preferred embodiments may be freely combined, superimposed, without conflict.

It will be understood that the above-described embodiments are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions may be made in the details described herein by those skilled in the art without departing from the basic principles of the invention.

Claims (10)

1. The utility model provides an interactive blackboard system of intelligence, is in including mutual display device and setting the blackboard main part of at least one side in mutual display device's the left and right sides, mutual display device's the back is provided with and is used for fixing mutual display device's fixed knot constructs, a serial communication port, the back of blackboard main part is provided with elevating gear, elevating gear is used for the blackboard main part for mutual display device goes up and down between primary importance and second place, the second place is higher than primary importance, when the blackboard main part is in the second place, mutual display device with the at least partial structure of the close one side of blackboard main part exposes, the blackboard main part with mutual display device is less than 3cm at the ascending first interval of horizontal direction.

2. The intelligent interactive blackboard system according to claim 1, wherein the lifting device comprises a wall hanging member and a telescopic member, a first end of the telescopic member is rotatably connected with the wall hanging member, a second end of the telescopic member is rotatably connected with the back surface of the blackboard main body, and the first end of the telescopic member and the second end of the telescopic member have a second distance in the horizontal direction;

when the blackboard main body is positioned at the first position, the resultant force formed by the component force of the force applied by the telescopic piece to the blackboard main body in the vertical direction and the gravity of the blackboard main body is 0 or downward;

when the blackboard main body is located at the second position, the telescopic piece is in an extending state, and the component force of the force applied to the blackboard main body by the telescopic piece in the vertical direction and the resultant force formed by the gravity of the blackboard main body are upward.

3. An intelligent interactive blackboard system according to claim 2, wherein a limiting structure is arranged on the back of the blackboard main body to limit the blackboard main body to move in the up and down direction.

4. An intelligent interactive blackboard system according to claim 3, wherein the limiting structure includes a limiting groove extending in the vertical direction, and the wall hanging member is provided with a fixing block matched with the limiting groove.

5. An intelligent interactive blackboard system according to claim 4, wherein a plurality of sections of slide rails are arranged between the side surface of the fixed block and the inner wall of the limit groove, and the number of the sections of the slide rails is at least 2.

6. An intelligent interactive blackboard system according to any one of claims 2 to 5, wherein the number of the telescopic members is 2, and 2 telescopic members are symmetrically arranged relative to the central plane of the blackboard body in the vertical direction.

7. An intelligent interactive blackboard system according to any one of claims 2 to 5, wherein the telescopic member is a gas spring or an electric telescopic rod.

8. The intelligent interactive blackboard system according to claim 2, wherein the wall hanging piece is provided with a first hook with a downward opening, and the first hook is used for being matched with a strip-shaped wall hanging piece;

the back of the wall hanging piece is fixed with a wall hanging lock hook, and the wall hanging lock hook is provided with a second hook with an upward opening and is used for being matched with the lower edge of the wall hanging piece.

9. The intelligent interactive blackboard system according to claim 8, wherein the wall hanging member is provided with a horizontal fixing plate, the fixing plate is provided with a first hole, the wall hanging lock hook is provided with a second hole corresponding to the first hole, the second hole is a threaded hole, and the first hole and the second hole are connected through a first bolt so as to adjust the height of the wall hanging member relative to the wall hanging member;

the wall-mounted hook is provided with a third hole, the wall-mounted hook is provided with a vertically-arranged elongated hole, and the third hole is connected with the elongated hole through a second bolt so as to limit the wall-mounted hook to move in the vertical direction relative to the wall-mounted hook.

10. An intelligent interactive blackboard system according to claim 8, wherein the wall hanging piece is further provided with a roller, and when the first hook is matched with the wall hanging piece, the roller is in rolling connection with the upper edge of the wall hanging piece.

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