WO2022177159A1

WO2022177159A1 - Rotation control device for heavy object

Info

Publication number: WO2022177159A1
Application number: PCT/KR2022/000584
Authority: WO
Inventors: 김노수; 이재구
Original assignee: 삼성전자(주)
Priority date: 2021-02-17
Filing date: 2022-01-12
Publication date: 2022-08-25
Also published as: KR20220117669A

Abstract

A rotation control device for a heavy object is disclosed. A rotation control device comprises: a link frame for supporting a heavy object; and a rotation structure for rotatably supporting the link frame. The rotation structure comprises: at least one column member; a rotary shaft part which is supported by the link frame and rotatably provided at a location of a predetermined rotation height of the at least one column member; a sprocket member supported by the rotary shaft part; a chain engaged with the sprocket member and moving according to a rotation of the link frame; a first spring connected to one end of the chain and extending or contracting according to the movement of the chain; and a second spring connected to the other end of the chain and extending or contracting oppositely to the first spring according to the movement of the chain.

Description

Rotation control device for heavy objects

This application claims priority based on Korean Patent Application No. 10-2021-0021305 filed with the Korean Intellectual Property Office on February 17, 2021, the disclosure of which is incorporated herein by reference in its entirety.

The present disclosure relates to a rotation control device for a heavy object.

Recent mobile devices have built-in multiple cameras. After assembling the components of the mobile device, the function of the camera is checked. The camera function check checks the focus or resolution of the camera while shooting a chart on which images such as figures are drawn.

The camera function test of the mobile device is carried out in the state where the chart is placed in front of the camera lens of the mobile device in the examination room. Charts need to be replaced with other charts to check the functionality of cameras of various specifications or for maintenance. Since the chart for functional inspection of the camera is located inside the examination room, it is not easy to replace and maintain it in a narrow space.

In order to facilitate replacement and maintenance of the chart, it is necessary to rotate the chart facing the camera lens of the mobile device 180 degrees to face the third direction opposite to the camera lens, which is the first direction. However, since the rotation unit including the chart is heavy, manual rotation operation is difficult, and there is a risk of operator injury and equipment damage due to the falling of the chart during rotation operation. In addition, when the rotation unit is manually rotated, the limit of the applicable weight may be lowered because it should be operated only by human power.

The present disclosure provides a rotation control device for a heavy object that can facilitate the rotation operation of the heavy object, reduce the risk of falling of the heavy object, and increase the limit of the weight.

According to an aspect of the present disclosure, a rotation control device for a heavy object is provided. The rotation control device includes a link frame for supporting a heavy object and a rotating structure for rotatably supporting the link frame. The rotating structure includes at least one pillar member, a sprocket member rotatably provided at a position of a designated rotational height of the at least one pillar member, a chain that moves in engagement with the sprocket member according to the rotation of the link frame, and one of the chain It includes a first spring connected to the end and a second spring connected to the other end of the chain.

The rotation control device may further include a base frame supporting the pillar member and fixing the first spring and the second spring.

The link frame includes a first support member for supporting the weight, a second support member for slidably supporting the first support member in a vertical axis direction, a rotating shaft supported by the sprocket member, and perpendicular to the extension direction of the rotating shaft. and a link member having a link shaft extending to and supported by the second support member.

The at least one pillar member includes first and second pillar members erected at intervals on the base frame, the link member being a first link member rotatably supported by the first pillar member, and the link The frame further includes a second link member having a second rotation shaft portion rotatably supported by the second pillar member and a second link shaft extending perpendicular to the extending direction of the second rotation shaft portion and supported by the second support member. may include

The sprocket member is a first sprocket member, the chain is a first chain, and the rotating structure moves in engagement with the second sprocket member according to the rotation of the second sprocket member supported by the rotating shaft and the link member. A second chain, a third spring that is connected to one end of the second chain and expands and contracts according to the movement of the second chain, and the third spring that is connected to the other end of the second chain and moves with the movement of the second chain Conversely, it may include a fourth spring that expands and contracts.

The sprocket member is a first sprocket member, the chain is a first chain, the rotation structure is supported by the second rotation shaft part and a second sprocket member is rotatably supported by the second post member, the second link A second chain that moves in engagement with the second sprocket member according to the rotation of the member, a third spring that is connected to one end of the second chain and expands and contracts according to the movement of the second chain, and the other end of the second chain It may include a fourth spring that is connected and expands and contracts opposite to the third spring according to the movement of the second chain.

The link frame may rotate between a first position in which the link member is parallel to the ground and a second position in a direction opposite to the first position.

Both the first spring and the second spring may be in a balanced state at a position where the link member is perpendicular to the ground.

Both the first spring and the second spring may be in an extended state at a position where the link member is perpendicular to the ground.

The weight may include at least one chart that provides an image for examining the camera function, the first position may be an inspection position of the chart, and the second position may be a replacement position of the chart.

The rotating structure may further include at least one locking member for fixing the link frame to the rotating structure at the first position.

The rotating structure may further include at least one stopper for stopping the rotation of the link frame at the first position or the second position.

According to the present disclosure, the rotation control device for a heavy object includes a weight reducing structure capable of distributing the load when rotating the heavy object, so that manual rotation of the heavy object is easy, and it is possible to prevent a drop due to the rapid rotation of the heavy object, and It is possible to increase the limit of the weight that can be manipulated.

The above and other aspects, features and advantages of the embodiments of the present disclosure will become more apparent from the following description with reference to the accompanying drawings.

1 is a diagram illustrating a camera function inspection system for a mobile device including a camera module, according to an embodiment.

2 is a view illustrating a rotation control device supporting first to fourth charts according to an embodiment.

3 is an exploded view of the rotation control device according to an embodiment as viewed from the front.

4 is an exploded view of the rotation control device of FIG. 2 as viewed from the rear.

5 is a diagram illustrating a rotation control device in a state in which angles of first, third, and fourth charts are adjusted according to an exemplary embodiment.

6 is an exploded view illustrating a weight reducing unit according to an exemplary embodiment.

7 is a view showing a rear surface of a link frame according to an embodiment.

8 is a diagram illustrating a state in which a link frame faces an inspection position according to an embodiment.

9 is a view showing a state in which the link frame according to an embodiment is lifted from the inspection position and rotated 90 degrees.

10 is a view showing a state in which the link frame is directed to the replacement position in the opposite direction to the inspection position according to an embodiment.

11 is a view showing a rotating structure according to another embodiment.

12 is a view showing a rotating structure according to another embodiment.

Hereinafter, various embodiments of the present disclosure will be described with reference to the accompanying drawings. However, this is not intended to limit the present disclosure to specific embodiments, and should be understood to include various modifications, equivalents, and/or alternatives of the embodiments of the present disclosure. In connection with the description of the drawings, like reference numerals may be used for like components. In the drawings, the same reference numbers or symbols refer to components that perform substantially the same function, and the size of each component in the drawings may be exaggerated for clarity and convenience of description. In describing the present disclosure, if it is determined that a detailed description of a known technology or configuration related to the present disclosure may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be omitted.

In the present disclosure, expressions such as “have,” “may have,” “include,” or “may include” indicate the presence of a corresponding characteristic (eg, a numerical value, function, operation, or component such as a part). and does not exclude the presence of additional features.

In this disclosure, expressions such as “A or B,” “at least one of A and/and B,” or “one or more of A or/and B” may include all possible combinations of the items listed together. . For example, "A or B," "at least one of A and B," or "at least one of A or B" means (1) includes at least one A, (2) includes at least one B; Or (3) it may refer to all cases including both at least one A and at least one B.

In an embodiment of the present disclosure, terms including an ordinal number, such as first, second, etc., are used only for the purpose of distinguishing one element from another element, and the expression of the singular number is plural unless the context clearly indicates otherwise. includes the expression of

In addition, in an embodiment of the present disclosure, terms such as 'upper', 'lower', 'left', 'right', 'inner', 'outer', 'inside', 'outer', 'front', 'rear', etc. is defined based on the drawings, and the shape or position of each component is not limited thereby.

The expression "configured to (or configured to)" as used in this disclosure depends on the context, for example, "suitable for," "having the capacity to" ," "designed to," "adapted to," "made to," or "capable of." The term “configured (or configured to)” may not necessarily mean only “specifically designed to” in hardware. Instead, in some circumstances, the expression “a device configured to” may mean that the device is “capable of” with other devices or parts.

Hereinafter, the rotation control device for a heavy object according to an embodiment will be described by taking the rotation control device 5 supported by a chart providing an image for examining the camera function of the mobile device assembled as a set as an example.

1 is a diagram illustrating a camera function inspection system 1 for a mobile device including a camera module, according to an embodiment.

The inspection system 1 is, for example, a smart phone (smart phone), a tablet (tablet), a laptop (laptop) notebook, a DSLR ( Digital Single- Lens Reflex ) camera, a mirrorless ( mirrorless ) camera, action You can check the function of the camera applied to mobile devices such as cams. The inspection system 1 may inspect the function of the camera, that is, focus point, image resolution.

Referring to FIG. 1 , the inspection system 1 includes an examination room 2 , an examination device 3 provided in the examination room 2 , charts 4a to 4d that provide images that can be photographed by a camera of a mobile device, and a chart It may include a rotation control device (5) for supporting (4a ~ 4d).

The examination room 2 may be sealed from the outside for photographing during the camera function examination. The inspection room 2 may include a first space 21 in which the rotation control device 5 is installed and a second space 22 in which the inspection device 3 is installed. The first space portion 21 and the second space portion 22 are adjacent and communicate with each other.

In the first space 21, a first horizontal rail 6 and a second horizontal rail 7 are installed on the floor so that the rotation control device 5 slides back and forth with respect to the camera of the mobile device. Accordingly, the distance between the camera of the mobile device mounted on the inspection device 3 and the charts 4a to 4d may be adjusted by the first horizontal rail 6 and the second horizontal rail 7 .

The first space 21 may include a door 211 on the opposite side of the second space 22 . The door 211 may open the first space 21 in order to replace or maintain the charts 4a to 4d supported by the rotation control device 5 .

The first space 21 may be formed at a height at which the rotation control device 5 can be rotated for replacement of the charts 4a to 4d.

The inspection device 3 may include a set mounting part 31 on which the mobile device in a set assembled state is seated for inspection in the manufacturing line. The inspection device 3 may be operated so that the camera of the mobile device seated on the set seating unit 31 faces the charts 4a to 4d. The inspection device 3 may drive the camera of the mobile device to perform the inspection while controlling the image displayed on the charts 4a to 4d supported by the rotation control device 5 to be photographed.

The first to fourth charts 4a to 4d may be angled with respect to the optical axis of the camera of the mobile device seated on the inspection device 3 .

The first to fourth charts 4a to 4d may have a plate-like overall shape. In the first to fourth charts 4a to 4d, images such as various figures, characters, portraits, and landscape photos may be displayed on the front side facing the camera of the mobile device during the inspection. Images of the first to fourth charts 4a to 4d may be displayed by, for example, built-in lighting. An object photographed by the camera of the mobile device is not limited to a chart displaying an image, and may include, for example, a model such as a miniature. A plurality of miniatures may be dispersedly arranged so that perspective can be expressed in the miniatures.

The first to fourth charts 4a to 4d may be disposed adjacent to each other in a state of being separated from each other. In the first to fourth charts 4a to 4d, images captured by the camera of the mobile device may be displayed independently or divided images may be displayed.

2 is a view showing a rotation control device 5 supporting the first to fourth charts 4a to 4d according to an embodiment, and FIG. 3 is a front view by disassembling the rotation control device 5 according to an embodiment. , and FIG. 4 is a view seen from the rear side by disassembling the rotation control device 5 of FIG. 2 .

Referring to FIG. 2 , the rotation control device 5 may include a link frame 51 for supporting the charts 4a to 4d, and a rotation structure 53 for rotatably supporting the link frame 51 . .

The link frame 51 is between the inspection position in the first direction toward the camera of the mobile device for inspection, and the replacement position in the third direction toward the door 211 of FIG. 1 opposite to the inspection position in the first direction. can be rotated. The link frame 51 may be lifted upward and rotated 180 degrees. The inspection position, replacement position, and rotation of the link frame 51 of this embodiment will be described in detail below.

3 and 4, the link frame 51 supports the first to fourth charts 4a to 4d, respectively, the first support member 511 for supporting the front surface, and the rear surface of the first support member 511. and a second support member 512 , and first and

second link members

513 and 514 provided between the second support member 512 and the rotating structure 53 .

The first support member 511 includes the first to fourth chart support parts 521 to 524 supporting each of the first to fourth charts 4a to 4d protruding from the front in a plate shape, and four vertical rail guides provided on the rear surface. 525 , and a pair of handles 526 provided on both upper sides to rotate the link frame 51 while holding the user.

The first chart support unit 521 may allow the first chart 4a to be adjusted in the horizontal direction with respect to the optical axis of the camera of the mobile device, for example, within an angle of -30 to +30 degrees.

The second chart support part 522 may include four rods 5221 to 5224 having one end fixed to the first support member 511 and the other end fixed to the rear surface of the second chart 4b. The second chart 4b supported by the second chart support unit 522 may display an image in a fixed state that cannot be adjusted in angle.

The third chart support unit 523 may allow the third chart 4c to be adjusted in the horizontal direction with respect to the optical axis of the camera of the mobile device, for example, within an angle of -30 to +30 degrees. The third chart support part 523 has the same or similar structure to the first chart support part 521 .

The fourth chart support unit 524 may allow the fourth chart 4d to be adjusted within an angle of, for example, -30 to +30 degrees in the vertical direction with respect to the optical axis of the camera of the mobile device. The fourth chart support part 524 has the same or similar structure to the first chart support part 521 or the third chart support part 523 and is rotated by 90 degrees so that the axis of rotation is arranged in the horizontal direction.

5 is a view showing the rotation control device 5 in a state in which the angles of the first, third and

fourth charts

4a, 4c, and 4d are adjusted.

As shown in FIG. 5, the first, third, and fourth

chart support units

521, 523, and 524 are first, third and

fourth charts

4a, 4c, 4d) can be adjusted to have various angles. Accordingly, the inspection system 1 may perform an inspection on the function of the camera under conditions similar to the actual camera use situation of the mobile device in which the angle between the photographing target and the camera of the mobile device is not constant.

3 and 4 , the second support member 512 may include first and second

vertical rails

5121 and 5122 engaged with the vertical rail guide 525 provided on the first support member 511 . can The first and second

vertical rails

5121 and 5122 may be engaged with the vertical rail guide 525 to enable the first support member 511 to slide along the first and second

vertical rails

5121 and 5122. . Accordingly, the first to fourth charts 4a to 4d supported by the first support member 511 have vertical heights determined by the vertical rail guide 525 and the first and second

vertical rails

5121 and 5122. can

One side of the second support member 512 may be supported by the first and

second link members

513 and 514 .

The first and

second link members

513 and 514 are rotatably provided at a predetermined height of the first and

second column members

532 and 533 of the rotation structure 53 , and the first and second

rotation shaft portions

5131 and 5141 and the first and first and

second link shafts

5132 and 5142 extending vertically from the second

rotation shaft portions

5131 and 5141, respectively.

The first and second

rotation shaft portions

5131 and 5141 may be rotatably supported by first and

second shaft holes

5321 and 5331 provided at predetermined heights of the first and

second pillar members

532 and 533, respectively.

In one embodiment, the first and

second link members

513 and 514 are rotatably supported on the first and

second pillar members

532 and 533 and are coupled to the first and

second link shafts

5132 and 5142 with one rotation shaft. may include wealth.

The rotating structure 53 includes a base frame 531, first and

second column members

532 and 533 erected at intervals on the base frame 531, first to third stoppers 534 to 536, and a weight reducing part. (537).

The base frame 531 may be slidably moved along the first and second

horizontal rails

6 and 7 by first and second horizontal rail guides (5313 and 5314 in FIG. 7 ) provided on the bottom in a plate shape.

The first and

second pillar members

532 and 533 may be erected on the base frame 531 at a distance from each other to provide a structure in which the link frame 51 can rotate at a predetermined height. The first and

second pillar members

532 and 533 may include first and

second shaft holes

5321 and 5331 respectively provided at a predetermined height.

The first stopper 534 may protrude forward toward the camera of the mobile device. The first stopper 534 may prevent further rotation when the link frame 51 is rotated to the inspection position. The first stopper 534 has an elastically stretchable structure, and may alleviate an impact upon contact due to rotation of the link frame 51 .

The second and

third stoppers

535 and 536 may protrude rearward toward a third direction opposite to the camera of the mobile device. The second and

third stoppers

535 and 536 may prevent further rotation when the link frame 51 is rotated to the replacement position. Like the first stopper 534 , the second and

third stoppers

535 and 536 have an elastically stretchable structure, and may mitigate impact upon contact due to rotation of the link frame 51 .

The weight reducing unit 537 may be provided on one side of the first pillar member 532 or the second pillar member 533 to interlock with the first rotation shaft portion 5131 of the first link member 513 . The weight reduction part 537 may be concealed by the cover 538 .

The weight reducing unit 537 facilitates the operation when rotating the link frame 51 on which the heavy charts 4a to 4d are supported and distributes the load to prevent the charts 4a to 4d from falling due to rapid rotation. can do it

6 is an exploded view of the weight reducing unit 537 .

Referring to FIG. 6 , the weight reducing unit 537 includes a sprocket member 5371 provided at a predetermined height of the first pillar member 532 , a chain 5372 engaged with the sprocket member 5371 , and one end of the chain 5372 . It may include a first spring 5373 connected to and a second spring 5374 connected to the other end of the chain 5372 .

The sprocket member 5371 may include a plurality of teeth 5371a formed on the outer circumferential surface and a third shaft hole 5371b formed in the center. The first rotation shaft portion 5131 of the first link member 513 may be received and fixed in the third shaft hole 5371b of the sprocket member 5371 . Accordingly, the sprocket member 5371 may be rotated according to the rotation of the first rotation shaft portion 5131 of the first link member 513 , that is, the rotation of the link frame 51 .

The chain 5372 may engage with some of the teeth 5371a of the sprocket member 5371 . The chain 5372 may include first and second hook holes 5372a and 5372b at both ends for connecting to the first and

second springs

5373 and 5374, respectively.

The first spring 5373 may include first and

second hooks

5373a and 5373b at both ends. The first spring 5373 has a first hook 5373a at one end fitted into the first hook hole 5372a at one end of the chain 5372, and a second hook 5373b at the other end of the first connecting ring 5375. It may be fastened to the first locking ring 5311 supported by the base frame 531 through it.

The second spring 5374 may include third and fourth hooks 5374a and 5374b at both ends. As for the second spring 5374, a third hook 5374a of one end is fitted into the second hook hole 5372b of the other end of the chain 5372, and a fourth hook 5374b of the other end connects the second connecting ring 5376. It may be fastened to the second locking ring 5312 supported by the base frame 531 through the base frame 531 .

The first and

second springs

5373 and 5374 may be spaced apart by a pair of

partition walls

5322 and 5323 provided on one side of the first pillar member 532 . In addition, refraction of the first and

second springs

5373 and 5374 and the chain 5372 may be limited between the

partition walls

5322 and 5323 and the inner surface of the cover ( 538 in FIG. 4 ).

The first and

second springs

5373 and 5374 may be selected as a specification having a larger elastic force for load distribution as the weight of the heavy object (chart) increases and the

link shafts

5132 and 5142 become longer.

When the sprocket member 5371 rotates counterclockwise, the first spring 5373 may be contracted as one end of the chain 5372 approaches and moves. At this time, the second spring 5374 may be reversely elongated as the other end of the chain 5372 moves apart.

When the sprocket member 5371 rotates clockwise, the first spring 5373 may extend as one end of the chain 5372 moves apart. At this time, the second spring 5374 may be conversely contracted as the other end of the chain 5372 approaches and moves.

As such, the first and

second springs

5373 and 5374 may be deformed from the equilibrium state to the extension state or from the extension state to the equilibrium state according to the rotation of the sprocket member 5371 .

In one embodiment, the first and

second springs

5373 and 5374 are extended from the equilibrium state to the extended state, contracted (restored) from the extended state to the equilibrium state, and from the equilibrium state to the compressed state according to the rotation of the sprocket member 5371. may be deformed. In order for the first and

second springs

5373 and 5374 to be in a compressed state, a separate pressing member for pressing when the sprocket member 5371 is rotated may be included.

7 is a view showing the rear side of the link frame (51).

As shown in FIG. 7 , the rotation control device 5 may include first and

second locking members

55 and 56 for preventing rotation of the link frame 51 . The first and

second locking members

55 and 56 are first and second

hook engaging portions

551 and 561 provided on the rear surface of the second support member 512 , and the first and second pillar members of the rotating structure 53 . It may include first and second locking hooks 552 and 562 supported by (532,533) and fastened to the first and second

hook locking parts

551 and 561 . As such, the first and

second locking members

55 and 56 may fix the link frame 51 to the rotation structure 53 so that the link frame 51 cannot be rotated any more when the link frame 51 is in the inspection position.

Hereinafter, the operation of the weight reducing unit 537 will be described with reference to FIGS. 8 to 10 .

8 is a view showing a state in which the link frame 51 faces the inspection position, FIG. 9 is a view showing a state in which the link frame 51 is lifted from the inspection position and rotated by 90 degrees, and FIG. 10 is the link frame ( 51) is a diagram showing the state facing the replacement position, which is the opposite direction of the inspection position.

Referring to FIG. 8 , the first link shaft 5132 connected to the rotating structure 53 and rotating is oriented in the first direction, which is an inspection position parallel to the ground ES on which the base frame 531 is supported. In this case, the first spring 5373 may be in an initial state and the second spring 5374 may be in an extended state. Of course, depending on the design, the first spring 5373 may be in a compressed state and the second spring 5374 may be in an extended state.

As shown in FIG. 9, in the state of FIG. 9, the user releases the first and

second locking members

55 and 56 of 7 to replace the charts 4a to 4d or for maintenance, and release the handle 526. It can be pulled up and rotated 90 degrees so that the charts 4a-4d are facing up. The state of FIG. 9 is a state in the process of moving to the state of FIG. 10 rather than a fixed state.

In FIG. 9 , the first link shaft 5132 connected to the rotating structure 53 and rotating is directed in the second direction perpendicular to the ground ES on which the base frame 531 is supported. In this case, both the first and

second springs

5373 and 5374 may be in an extended state. Of course, depending on the design, both the first and

second springs

5373 and 5374 may be in an initial state.

As shown in FIG. 10 , the user may rotate the link frame 51 further by 90 degrees in the state of FIG. 9 , that is, rotate 180 degrees in the state of FIG. 8 . At this time, the first link shaft 5132 that is connected to the rotating structure 53 and rotates is a third direction that is a parallel replacement position with respect to the ground ES on which the base frame 531 is supported, that is, the opposite direction to the first direction. is heading towards In this case, the first spring 5373 may be in an extended state and the second spring 5374 may be in an initial state. Of course, depending on the design, the first spring 5373 may be in an extended state and the second spring 5374 may be in a compressed state.

As described above, the weight (link frame) is easily lifted by the restoring force of the extended second spring 5374 when it rotates in FIG. It is possible to prevent abrupt downward rotation by the tensile force of the first spring 5373 when it is rotated.

11 is a view showing a rotating structure 73 according to another embodiment.

The rotating structure 73 may include first and second

weight reducing parts

737 and 738 provided adjacent to each other on the first pillar member 732 .

The first weight reducing unit 737 includes a first sprocket member 7371 provided at a predetermined height of the first pillar member 732, a first chain 7372 engaged with the first sprocket member 7371, and a first chain ( It may include a first spring 7373 connected to one end of the 7372, and a second spring 7374 connected to the other end of the first chain 7372.

The second weight reducing part 738 includes a second sprocket member 7381 integrally coupled to the first sprocket member 7371 of the first weight reducing part 737, and a second sprocket member 7381 engaged with the second sprocket member 7381. It may include a chain 7382 , a third spring 7383 connected to one end of the second chain 7382 , and a fourth spring 7384 connected to the other end of the second chain 7382 .

12 is a view showing a rotating structure 83 according to another embodiment.

The rotating structure 83 may include a first weight reducing unit 837 provided on the first pillar member 832 and a first weight reducing unit 838 provided on the second pillar member 833 .

The first weight reducing part 837 is coupled to the first rotating shaft part 5131 of the first link member 513 shown in FIG. 4, and the second weight reducing part 838 is the second link member shown in FIG. 514) may be coupled to the second rotation shaft portion 5141. In this way, the first and second

weight reducing units

837 and 838 operate in relation to each of the first and

second link members

513 and 514, thereby enabling stable load distribution.

When the load of the heavy object is very large, there may be a limit in distributing the load of the heavy object with only one weight reducing part 537 shown in FIG. 6 . In this case, as shown in FIGS. 11 and 12 , two or more

weight reducing units

737, 738 and 837 and 838 may be applied to increase the limit amount of one weight distribution.

Although preferred embodiments have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and common knowledge in the technical field to which the present invention pertains without departing from the gist of the present disclosure as claimed in the claims Various modifications are possible by those having, of course, these modified embodiments should not be individually understood from the technical spirit or perspective of the present disclosure.

Claims

a link frame for supporting a heavy object; and

It includes a rotating structure for rotatably supporting the link frame,

The rotating structure is

at least one column member;

a sprocket member rotatably provided at a specified rotational height of the at least one pillar member;

a chain moving in engagement with the sprocket member according to the rotation of the link frame;

a first spring connected to one end of the chain; and

A rotation control device for a heavy object including a second spring connected to the other end of the chain.
According to claim 1,

The rotation control device for a heavy object further comprising a base frame supporting the pillar member and fixing the first spring and the second spring.
According to claim 1,

The link frame is

a first support member for supporting the weight;

a second support member for slidably supporting the first support member in a vertical axis direction; and

A rotation control device for a heavy object, comprising: a rotation shaft supported by the sprocket member; and a link member having a link shaft extending perpendicular to an extension direction of the rotation shaft portion and supported by the second support member.
4. The method of claim 3,

the at least one pillar member includes first and second pillar members erected at intervals on the base frame;

The link member is a first link member rotatably supported on the first pillar member,

The link frame is

Further comprising a second link member having a second rotation shaft portion rotatably supported by the second pillar member and a second link shaft extending perpendicular to the extension direction of the second rotation shaft portion and supported by the second support member Rotation control device for heavy objects.
According to claim 1,

The sprocket member is a first sprocket member,

The chain is a first chain,

The rotating structure is

a second sprocket member supported by the rotating shaft portion;

a second chain that engages and moves with the second sprocket member according to the rotation of the link member;

a third spring that is connected to one end of the second chain and expands and contracts according to the movement of the second chain; and

and a fourth spring that is connected to the other end of the second chain and expands and contracts opposite the third spring according to the movement of the second chain.
5. The method of claim 4,

The sprocket member is a first sprocket member,

The chain is a first chain,

The rotating structure is

a second sprocket member supported by the second rotation shaft and rotatably supported by the second pillar member;

a second chain that engages and moves with the second sprocket member according to the rotation of the second link member;

a third spring that is connected to one end of the second chain and expands and contracts according to the movement of the second chain; and

and a fourth spring that is connected to the other end of the second chain and expands and contracts opposite the third spring according to the movement of the second chain.
4. The method of claim 3,

The link frame is a rotation control device for a heavy object in which the link member rotates between a first position parallel to the ground and a second position opposite to the first position.
8. The method of claim 7,

The first spring and the second spring are rotation control devices for a heavy object in which the link member is in a balanced state at a position perpendicular to the ground.
8. The method of claim 7,

The first spring and the second spring are rotation control devices for a heavy object in which the link member is both extended in a position perpendicular to the ground.
8. The method of claim 7,

The weight includes at least one chart that provides an image for examining the camera function of the mobile device,

The first position is an inspection position of the chart,

The second position is a rotation control device for a heavy object, which is a replacement position of the chart.
According to claim 1,

The rotating structure is

The rotation control device for a heavy object further comprising at least one locking member for fixing the link frame to the rotation structure in the first position.
According to claim 1,

The rotating structure is

The rotation control device for a heavy object further comprising at least one stopper for stopping the rotation of the link frame in the first position or the second position.