TW202430456A - Storage shelf - Google Patents

Abstract

This storage shelf comprises: a placement part on which an article is placed from above; and a restriction member that restricts the upward movement of the article, by rotating in one direction in conjunction with the article being placed on the placement part from above and by advancing to a position directly above the article which was placed on the placement part.

Description

Storage Scaffolding

This disclosure is about storage scaffolding.

As a storage shelf, a storage device such as that described in Patent Document 1 is known, which includes: a shelf plate (loading portion) for loading transported objects (articles), and an anti-drop mechanism for limiting the upward movement of the transported objects loaded on the shelf plate. In the storage device described in Patent Document 1, the anti-drop mechanism is pushed horizontally by a lifting mechanism that moves in a horizontal direction, so that the anti-drop mechanism moves between a position where it advances to the top of the article and a position where it retreats from the top of the article. [Prior Art Document] [Patent Document]

[Patent Document 1] Japanese Patent Application Publication No. 2011-29549

[The problem the invention is trying to solve]

The storage rack may not be able to restrict the upward movement of the articles when the articles are placed on the placement part from above without following the horizontal movement of the lifting mechanism. Also, the storage rack may not be able to restrict the upward movement of the articles when the articles are placed on the placement part from above after the lifting mechanism is moved horizontally at a high position.

Therefore, the purpose of the present disclosure is to provide a storage rack that can limit the upward movement of items placed on the placement portion from above. [Technical means for solving the problem]

(1) A storage rack according to one aspect of the present disclosure comprises a loading portion and a limiting member. The loading portion is used to load articles from above. The limiting member rotates in one direction as articles are loaded from above onto the loading portion and moves forward to a position directly above the articles loaded on the loading portion, thereby limiting the upward movement of the articles.

In the storage shelf, the upward movement of the articles placed on the placement portion can be restricted by the restriction member by utilizing the downward movement of the articles during placement. That is, the upward movement of the articles placed on the placement portion from above can be restricted.

(2) The storage shelf described in (1) above may also be configured such that the limiting member has: a rotation axis extending in the lead vertical direction, and a main body portion arranged to rotate about the rotation axis, the main body portion including a spiral contact surface, the spiral contact surface being inclined relative to the lead vertical surface and extending in a spiral shape with the rotation axis as the center, and being able to contact the article placed on the placement portion from above. In this case, the limiting member can be easily and reliably moved forward to a forward position directly above the article placed on the placement portion by utilizing the descending movement of the article.

(3) The storage rack described in (1) or (2) above may also be configured such that the limiting member is rotated in a direction opposite to one direction as the article is lifted upward from the placement portion, and thus retreats from directly above the placed article, thereby releasing the restriction on the upward movement of the article. In this case, the restriction on the movement of the article (the restriction on the upward movement of the article) by the limiting member can be released by the rising movement of the article.

(4) In the storage rack described in (3) above, the restriction member may include an elastic body that applies force to rotate the restriction member in the other direction. In this case, the movement restriction of the restriction member can be released by utilizing the elastic force of the elastic body.

(5) The storage rack described in (4) above may be configured such that the limiting member has a rotation damper that slows down the rotation speed of the limiting member in the other direction. In this case, for a normal upward movement of an object, such as during transfer, the limiting member can be rotated in the other direction to follow the upward movement, thereby releasing the movement restriction by the limiting member. On the other hand, for a rapid upward movement (floating) of an object, such as during an earthquake, the rotation damper slows down the rotation speed of the limiting member in the other direction, thereby preventing the movement restriction by the limiting member from being immediately released.

(6) The storage rack described in any one of the above (1) to (5) may also be configured to have a positioning pin, which is provided on the loading portion and protrudes upward, and is used to be inserted into a recessed portion at the bottom of the article loaded on the loading portion, and when the article is loaded on the loading portion, the length of the positioning pin inserted into the recessed portion is longer than the distance between the portion of the limiting member that enters directly above the article and the article. In this case, when the movement is restricted by the restricting member, the positioning pin can be prevented from being disengaged from the recessed portion of the article.

(7) The storage shelf described in (2) above may also be configured such that when the main body is at the first rotation position and the article is at the first height position, the article is brought into contact with the spiral contact surface, and when the article is lowered from the first height position to the second height position, the article slides on the spiral contact surface while pushing the spiral contact surface, so that the main body rotates in one direction from the first rotation position to the second rotation position, and the second height position is a height position lower than the first height position and when the article is placed on the placement portion. In this case, when the article is placed on the placement portion, the main body can be rotated in one direction from the first rotation position to the second rotation position by specifically utilizing the descending movement of the article.

(8) The storage shelf described in (7) above may also be constructed such that the main body has: a base having a spiral contact surface, and an extension portion that is integrally provided with the base and extends in the horizontal direction, and when the main body is in the first rotation position, the extension portion retreats from directly above the loading area for loading items in the loading portion, and when the main body is in the second rotation position, the extension portion advances to directly above the item. In this case, when the item is loaded on the loading portion, the extension portion can be moved to the forward position to restrict the upward movement of the item. [Effect of the invention]

According to the present disclosure, a storage rack capable of restricting upward movement of articles placed on a placing portion from above can be provided.

Hereinafter, the embodiments will be described in detail with reference to the drawings. In the description of the drawings, the same or corresponding elements are given the same symbols and repeated descriptions are omitted. The terms "upper" and "lower" correspond to the upper and lower directions in the vertical direction.

As shown in FIG. 1 , a storage rack 1 is, for example, arranged along a track 4 of an overhead transport vehicle 6 of an overhead transport vehicle system S constituting a semiconductor manufacturing plant. The storage rack 1 temporarily stores items 10 such as FOUP. The storage rack 1 is an overhead temporary storage area (OHB). The storage rack 1 has a loading portion 8 suspended from a ceiling by a plurality of shelf pillars 9. The storage rack 1 receives, supports, and stores items 10 transferred from the overhead transport vehicle 6. In the example shown in the figure, the storage rack 1 is an under-track temporary storage area (UTB) in which the loading portion 8 is arranged directly below the track 4.

As shown in FIG. 2 , the article 10 is, for example, a FOUP (Front Opening Unified Pod) for storing a plurality of semiconductor wafers. The article 10 comprises: a box-shaped container body 11 with an opening on the front side, a cover 12 detachably mounted on the front side of the container body 11, a flange 13 mounted on the upper portion of the container body 11, and a bottom plate 14 mounted on the lower portion of the container body 11. The flange 13 is a portion held by the overhead transport vehicle 6. The flange 13 is formed in a plate shape along the upper surface of the container body 11. The flange 13 is located in the center of the upper surface when viewed from above. The bottom plate 14 is formed in a plate shape along the lower surface of the container body 11. The bottom plate 14 is arranged to extend outward from both sides of the container body 11. Three recessed portions (grooves or holes) 15 (see FIG. 11 ) for positioning are provided on the lower surface (bottom) of the container body 11. Positioning pins P described later are inserted into the recessed portions 15.

Returning to FIG. 1 , the overhead transport vehicle 6 moves along the track 4 laid near the ceiling and transports the articles 10. The overhead transport vehicle 6 has: a traveling portion 18, a main frame 22, a transverse transfer portion 24, a θ drive portion 26, a lifting drive portion 28, and a lifting platform 30. The traveling portion 18 allows the overhead transport vehicle 6 to move along the track 4. The transverse transfer portion 24 allows the θ drive portion 26, the lifting drive portion 28, and the lifting platform 30 to slide and move together. The θ drive portion 26 allows the lifting drive portion 28 and the lifting platform 30 to rotate within a predetermined angle range in a horizontal plane. The lifting drive portion 28 allows the lifting platform 30 to rise and fall by winding or unwinding the suspension material. The lifting platform 30 is used to lift and lower the article 10 by holding it with the holding portion 31 .

As shown in Fig. 1 and Fig. 3, the loading section 8 is a portion where the articles 10 are transferred between the loading section 8 and the overhead transport vehicle 6. The articles 10 are loaded from above on the loading section 8. The loading section 8 is composed of a plate-shaped member with the vertical direction being the thickness direction. The loading section 8 has a loading surface 8x along a horizontal plane. The articles 10 transported by the overhead transport vehicle 6 are temporarily loaded on the loading section 8.

For example, when transferring the article 10 from the loading portion 8 to the overhead transport vehicle 6, the overhead transport vehicle 6 without holding the article 10 is stopped at a predetermined position above the loading portion 8. When the position of the lifting platform 30 to be lowered at the stop position deviates from the predetermined position for the loading portion 8 (article 10), the horizontal position and the horizontal angle of the lifting platform 30 are adjusted by driving the lateral transfer portion 24 and the θ drive portion 26. Then, the lifting platform 30 is lowered by the lifting drive portion 28, and the flange 13 of the article 10 placed on the loading portion 8 is held by the gripping portion 31 of the lifting platform 30. Then, the lifting platform 30 is raised by the lifting drive portion 28, and the article 10 is lifted upward. Then, the overhead transport vehicle 6 holding the article 10 starts to move.

On the other hand, for example, when transferring the article 10 from the overhead transport vehicle 6 to the loading section 8, the overhead transport vehicle 6 holding the article 10 is stopped at a predetermined position above the loading section 8. When the position of the lifting platform 30 (article 10) to be lowered at the stopped position deviates from the predetermined position for the loading section 8, the horizontal position and the horizontal angle of the lifting platform 30 are adjusted by driving the lateral transfer section 24 and the θ driving section 26. Then, the lifting platform 30 is lowered by the lifting driving section 28, and after the loading section 8 loads the article 10 from above, the gripping section 31 of the lifting platform 30 releases the gripping of the flange 13 of the article 10. Then, the lifting platform 30 is raised to the rising end by the lifting driving section 28. Then, the overhead transport vehicle 6 without holding the article 10 starts to move.

Three positioning pins P are provided on the loading portion 8. The positioning pins P protrude upward from the loading surface 8x. The positioning pins P are inserted into the recessed portion 15 on the lower surface of the article 10 loaded on the loading portion 8 until the tip of the positioning pins P touches the article 10. In this way, the article 10 is loaded on the loading portion 8 while being positioned. The positioning pins P are, for example, kinematic pins. In the example shown in the figure, the positioning pins P are dispersedly arranged at three points on the loading surface 8x that are not in a straight line when viewed from above.

The storage rack 1 of this embodiment is provided with a limiting member 50. The limiting member 50 rotates in one direction as the article 10 is placed on the placing portion 8 from above, and moves forward to the position directly above the article 10 placed on the placing portion 8, thereby limiting the upward movement of the article 10. The limiting member 50 rotates in the other direction as the article 10 is lifted upward from the placing portion 8, and retreats from the position directly above the placed article 10, thereby releasing the restriction on the upward movement of the article 10. Directly above the article 10 is the top of the article 10. Directly above the article 10 is the position overlapping the article 10 when viewed from above.

As shown in Figs. 3, 4, 5 and 6, the limiting member 50 is provided on the loading portion 8. A pair of limiting members 50 is arranged for each article 10 placed on the loading portion 8. When viewed from above, a pair of limiting members 50 is arranged on the loading surface 8x so that the loading area Z for placing the article 10 on the loading portion 8 is opposite to each other in the horizontal direction. The limiting member 50 includes a rotation shaft 51, a main body 52, a rotation stopper 53, a torsion spring (elastic body) 54 and a rotation damper 55.

Another direction is a direction on one side of the rotation direction. Here, one direction is one direction (clockwise direction) of the rotation direction around the rotation axis 51. Another direction is a direction opposite to the one direction, that is, a direction on the other side of the rotation direction. Here, another direction is another direction (counterclockwise direction) of the rotation direction around the rotation axis 51. FIG. 1 and FIG. 3 to FIG. 8 show a state in which the limiting member 50 does not rotate further in the other direction, that is, an initial state.

The rotation shaft 51 is a shaft member extending in the lead vertical direction. The rotation shaft 51 is formed in a cylindrical shape, for example. The lower part of the rotation shaft 51 is fixed to a rectangular plate-shaped plate 61 and supported. The plate 61 is arranged on the mounting surface 8x of the mounting part 8 with the lead vertical direction as the thickness direction. The plate 61 is fixed to the mounting part 8 by bolts B0.

The main body 52 is arranged to be rotatable with the rotating shaft 51 as the main axis. The main body 52 is formed of, for example, resin. The main body 52 includes a base 56 and an extension 57. A through hole 56h is formed in the base 56. The rotating shaft 51 can be inserted into the through hole 56h through a cylindrical sliding bearing 62 with a flange. Thereby, the base 56 can be rotated in one direction and the other direction with the rotating shaft 51 as the main axis.

A spiral contact surface 58 is provided on the base 56. That is, the main body 52 has a spiral contact surface 58. The spiral contact surface 58 is inclined relative to the lead straight surface and extends in a spiral shape with the rotation axis 51 as the center. The spiral contact surface 58 extends from the upper end to the lower end of the base 56. In a top view, the spiral contact surface 58 extends in an angle range of 180° along the circumferential direction with the rotation axis 51 as the center. The spiral contact surface 58 is a slope that descends while rotating around the rotation axis 51. The spiral contact surface 58 is a convex curved surface and extends smoothly and continuously. The spiral contact surface 58 is a surface that can contact the object 10 placed on the placement portion 8 from above. The spiral contact surface 58 overlaps with the loading area Z in a top view. The spiral contact surface 58 is a sliding surface for the object 10 to slide. The tilt angle of the spiral contact surface 58 relative to the lead straight surface is constant from the upper end to the lower end of the spiral contact surface 58.

The spiral contact surface 58 converts the downward force applied by the object 10 from above into a force in one direction of rotation. Specifically, the object 10 hits the spiral contact surface 58 from above and pushes the spiral contact surface 58, thereby generating a force to rotate the base 56 in one direction. As a result, while the base 56 rotates in one direction by this force, the object 10 moves (slides) toward the mounting surface 8x by sliding on the spiral contact surface 58.

As shown in Fig. 7 and Fig. 8(b), a pressed surface 56x is formed at the bottom of the base 56 to be pressed in the other direction of the rotation direction by the torsion spring 54. In order to prevent the base 56 from further rotating in the other direction in the initial state, an engaged surface 56y is formed at the bottom of the base 56 to be engaged with the rotation stopper 53 in the rotation direction.

As shown in FIGS. 3 to 6 , the extension portion 57 is integrally formed with the base 56. The extension portion 57 is fixed to the upper portion of the base 56 by bolts (not shown) or the like. The extension portion 57 rotates in one direction and the other direction synchronously with the base 56 with the rotation shaft 51 as the base axis. The extension portion 57 is configured to extend in the horizontal direction. The extension portion 57 includes a clamping portion 64, which is a convex portion provided in a manner of protruding in the horizontal direction from the base 56.

The clamping portion 64 has a structure that is bent in a manner that extends downward while protruding toward a side opposite to the spiral contact surface 58. The lower surface of the clamping portion 64 is a plane along a horizontal plane. The lower surface of the clamping portion 64 is located above the lower end of the spiral contact surface 58. In the initial state, the clamping portion 64 is arranged to protrude toward the outside side opposite to the loading area Z when viewed from above. On the other hand, as shown in Figure 11, when the article 10 is placed on the loading portion 8, the extension portion 57 rotates in one direction synchronously with the base 56, and as a result, the clamping portion 64 advances to just above the bottom plate 14 of the article 10 placed on the loading portion 8 (as described later in detail). The clamping portion 64 is a portion that is configured to advance directly above the article 10.

The rotation stopper 53 is engaged with the engaged surface 56y of the base 56 in the rotation direction in the initial state, thereby preventing the base 56 from further rotating in the other direction. The rotation stopper 53 is a cylindrical member with the lead straight direction as the axial direction. The rotation stopper 53 is provided on the plate 61. According to the rotation stopper 53, in the initial state, the main body 52 is prevented from rotating in the other direction, and the rotation position of the main body 52 is located at the first rotation position.

The torsion spring 54 applies force to the limiting member 50 so as to rotate in the other direction. The torsion spring 54 is wound around the lower part of the rotation shaft 51 on the plate 61. One end 54a of the fixed point on one arm of the torsion spring 54 is engaged with the rotation stopper 53. The other end 54b of the action point on the other arm of the torsion spring 54 is engaged with the pressed surface 56x of the base 56. Thereby, the torsion spring 54 presses the pressed surface 56x in the other direction of the rotation direction, and applies force to the base 56 so as to rotate in the other direction.

The rotation damper 55 slows down the rotation speed of the limiting member 50 in the other direction. The rotation damper 55 is fixed to the upper surface of the extension 57 by a bolt B1. The rotation damper 55 is connected to the upper end of the rotation shaft 51 by a coupling 65. The rotation damper 55 is not particularly limited, and various known rotation dampers can be used.

Next, an operation example of the restriction member 50 will be described.

Here, an example is described in which the article 10 is placed on the placement portion 8 from directly above in order to temporarily store the article 10 on the storage shelf 1. First, in an initial state where no article 10 is placed on the placement portion 8, as shown in FIG. 3 , the main body 52 is located at the first rotation position, and the clamping portion 64 of the extension portion 57 is located at a position retreated from directly above the placement area Z. In this initial state, the lifting platform 30 holding the article 10 is lowered, and the article 10 is lowered from above toward the placement portion 8. Thereby, as shown in FIG. 8(a) and FIG. 8(b), when the article 10 is located at the first height position T1, the bottom plate 14 of the article 10 is brought into contact with the upper portion of the spiral contact surface 58.

As shown in Fig. 9(a) and Fig. 9(b), if the article 10 continues to descend toward the placement portion 8, the spiral contact surface 58 is pushed by the bottom plate 14, generating a force to rotate the main body 52 in one direction. This force is greater than the elastic force of the torsion spring 54 (the force in the other direction of the rotation direction), and as a result, the main body 52 is rotated in one direction while the bottom plate 14 of the article 10 moves downward by sliding on the spiral contact surface 58. At this time, the clamping portion 64 of the extension portion 57 moves in a horizontal rotation in one direction of the rotation direction.

If the article 10 continues to descend toward the placement portion 8, as shown in FIG. 10(a) and FIG. 10(b), the spiral contact surface 58 continues to be pushed by the bottom plate 14, and the bottom plate 14 of the article 10 moves downward by sliding on the spiral contact surface 58 while the main body 52 rotates in one direction. At the same time, the positioning pin P is inserted into the recess 15 on the lower surface of the article 10. Through the above process, the article 10 is placed on the placement surface 8x.

When the article 10 is placed on the placement surface 8x, the bottom plate 14 of the article 10 contacts the lower portion of the spiral contact surface 58, the main body 52 rotates in one direction to the second rotation position, and the article 10 is located at the second height position T2 lower than the first height position T1. When the article 10 is placed on the placement surface 8x, the clamping portion 64 of the extension portion 57 moves in a further horizontal rotational manner in one direction of the rotation direction, and moves forward to the top of the bottom plate 14 of the article 10. As shown in Figure 11, when the article 10 is placed on the loading surface 8x, the length H0 of the positioning pin P inserted into the recess 15 of the article 10 (i.e., the depth of the recess 15) is longer than the distance L0 between the bottom plate 14 of the article 10 and the clamping portion 64 that advances to the top of the bottom plate 14.

On the other hand, when the article 10 placed on the placing surface 8x of the placing portion 8 is transferred to the overhead transport vehicle 6, the lifting platform 30 holding the article 10 is raised to lift the article 10 upward. This releases the push of the bottom plate 14 of the article 10 on the spiral contact surface 58, and the main body 52 is rotated in the other direction by the elastic force of the torsion spring 54 to return to the initial state.

At this time, because the rotation speed of the main body 52 in the other direction is slowed down by the rotation damper 55, even if the object 10 rises rapidly, the main body 52 will not follow the rising action, and the bottom plate 14 of the object 10 will leave the spiral contact surface 58. In this case, the clamping part 64 of the extension 57 continues to move forward to the top of the bottom plate 14 of the object 10, and the upward movement of the object 10 is restricted. If the object 10 is lifted in the normal rising action, the main body 52 will follow the rising action and rotate, and at the same time, the bottom plate 14 of the object 10 will move upward by sliding on the spiral contact surface 58. As a result, the clamping portion 64 of the extension portion 57 moves in a horizontal rotational manner in the other direction of the rotation direction, and retreats from directly above the bottom plate 14 of the article 10. As a result, the restriction on the upward movement of the article 10 is released.

As described above, in the storage shelf 1, the upward movement of the articles 10 placed on the placement portion 8 can be restricted by the restriction member 50 by utilizing the downward movement of the articles 10 during placement. That is, the upward movement of the articles 10 placed on the placement portion 8 from above can be restricted.

In the storage shelf 1, the limiting member 50 has a rotation axis 51 extending in the vertical direction and a main body 52 arranged to rotate around the rotation axis 51. The main body 52 includes a spiral contact surface 58. In this case, the limiting member 50 can be easily and reliably moved to a forward position directly above the article 10 placed on the placement portion 8 by utilizing the descending motion of the article 10.

In the storage shelf 1, as the article 10 is lifted upward from the placement portion 8, the restriction member 50 is rotated in a direction opposite to the one direction and withdrawn from directly above the placed article 10, thereby releasing the restriction on the upward movement of the article 10. In this case, the restriction on the movement of the article 10 (the restriction on the upward movement of the article 10) by the restriction member 50 can be released by the rising action of the article 10.

In the storage shelf 1, the restriction member 50 has a torsion spring 54 that urges the restriction member 50 to rotate in the other direction. In this case, the movement restriction of the restriction member 50 can be released by the elastic force of the torsion spring 54.

In the storage rack 1, the limiting member 50 has a rotation damper 55 that slows down the rotation speed of the limiting member 50 in the other direction. In this case, for example, in the case of a normal upward movement of the article 10 during transfer, the limiting member 50 can be rotated in the other direction by the elastic force of the torsion spring 54 to follow the upward movement, thereby releasing the movement restriction of the limiting member 50. In other words, the rotation damper 55 slows down the rotation speed of the limiting member 50 to a range that allows the limiting member 50 to follow the normal upward movement. On the other hand, for example, in the case of a rapid upward movement (floating) of the article 10 during an earthquake, the rotation damper 55 slows down the rotation speed of the limiting member 50 in the other direction, thereby preventing the movement restriction of the limiting member 50 from being immediately released.

The storage shelf 1 includes a positioning pin P provided on the placement portion 8. When the article 10 is placed on the placement portion 8, the length H0 of the positioning pin P inserted into the recess 15 of the article 10 is longer than the distance L0 between the lower surface of the clamping portion 64 of the restriction member 50 and the upper surface of the bottom plate 14 of the article 10. In this case, when the movement is restricted by the clamping portion 64 of the restriction member 50, the positioning pin P can be prevented from being disengaged from the recess 15 of the article 10.

In the storage rack 1, when the main body 52 is located at the first rotation position and the article 10 is located at the first height position T1, the article 10 is brought into contact with the spiral contact surface 58. When the article 10 is lowered from the first height position T1 to the second height position T2, the article 10 slides on the spiral contact surface 58 and pushes the spiral contact surface 58, so that the main body 52 is rotated in one direction from the first rotation position to the second rotation position. In this case, when the article 10 is placed on the placement portion 8, the main body 52 can be rotated in one direction from the first rotation position to the second rotation position by utilizing the descending motion of the article 10.

In the storage shelf 1, the main body 52 has: a base 56 provided with a spiral contact surface 58, and an extension portion 57 provided integrally with the base 56 and extending in the horizontal direction. When the main body 52 is located at the first rotation position, the clamping portion 64 retreats from directly above the placement area Z of the placement portion 8. When the main body 52 is located at the second rotation position, the clamping portion 64 advances to directly above the article 10. In this case, when the article 10 is placed on the placement portion 8, the clamping portion 64 of the extension portion 57 can be moved to the forward position to restrict the upward movement of the article 10.

The above is an explanation of the implementation of the present disclosure, but the present disclosure is not limited to the above implementation.

In the above embodiment, the article 10 is not limited to FOUP, and may be a container for storing glass substrates, a container such as a grating box, and general parts. In the above embodiment, a plurality of articles 10 may be placed on the storage rack 1. In the above embodiment, although a pair of limiting members 50 is provided for each article 10, one or more than three limiting members 50 may be provided for each article 10. In the above embodiment, the storage rack 1 may be, for example, a side rail temporary storage area (STB) in which the placing portion 8 is placed on the side of the rail 4. In this case, the overhead transport vehicle 6 may place the article 10 on the placing portion 8 from above after sliding the article 10 via the lateral transfer portion 24.

In the above-mentioned embodiment, the base 56 and the extension 57 are separable, but the base 56 and the extension 57 may be integrally formed and inseparable. In the case where the base 56 and the extension 57 are separable, for example, a plurality of extensions 57 having different shapes of the clamping parts 64 may be prepared in advance, and the extensions 57 may be replaced according to the situation and purpose. In this case, various situations and purposes can be dealt with.

Each structure in the above-mentioned embodiments and modifications is not limited to the above-mentioned materials and shapes, and various materials and shapes can be used. Each structure in the above-mentioned embodiments or modifications can be arbitrarily applied to each structure in other embodiments or modifications. Part of each structure in the above-mentioned embodiments or modifications can be appropriately omitted within the scope of the gist of one aspect of the present disclosure.

1: Storage shelf 8: Loading part 10: Articles 15: Recess 50: Limiting member 51: Rotation axis 52: Main body 54: Torsion spring (elastic body) 55: Rotation damper 56: Base 57: Extension part 58: Spiral contact surface P: Positioning pin Z: Loading area

[Figure 1] is a side view showing a storage rack and an overhead transport vehicle in an embodiment. [Figure 2] is a perspective view showing the article in Figure 1. [Figure 3] is a top view showing the storage rack in Figure 1. [Figure 4] is a perspective view showing the limiting member in Figure 3. [Figure 5] is another perspective view showing the limiting member in Figure 3. [Figure 6] is a perspective view showing the limiting member in Figure 4 in cross-section. [Figure 7] is a perspective view showing the peripheral structure of the torsion spring in the limiting member in Figure 4. [Figure 8] Figure 8(a) is a perspective view illustrating the action of the limiting member when the loading portion of the storage rack is loaded from above. Figure 8(b) is a side view showing the limiting member and the article in Figure 8(a). [Figure 9] Figure 9(a) is a three-dimensional view illustrating the subsequent operation of Figure 8(a). Figure 9(b) is a side view showing the limiting member and the article in Figure 9(a). [Figure 10] Figure 10(a) is a three-dimensional view illustrating the subsequent operation of Figure 9(a). Figure 10(b) is a side view showing the limiting member and the article in Figure 10(a). [Figure 11] is a side view showing a portion of the limiting member with the article placed on the placement portion in an enlarged manner.

8: Loading section

8x: Loading surface

10: Items

11: Container body

14: Base plate

50: Restriction components

51: Rotation axis

52: Main body

53: Rotation stopper

54: Torsion spring (elastic body)

54a: one end

54b: The other end

55: Rotational damper

56: Base

56y: The locked surface

57: Extension part

58: Spiral contact surface

61: Panels

64: Clamping part

65: Connector

B0: Bolt

T2: 2nd height position

Claims (8)

A storage shelf is provided with a loading portion and a limiting member, The loading portion is used to load items from above; The limiting member rotates in one direction as the items are loaded from above on the loading portion, and moves forward to the position directly above the items loaded on the loading portion, thereby limiting the upward movement of the items. As in the storage rack of claim 1, wherein, the aforementioned limiting member comprises: a rotation axis extending along the lead vertical direction, and a main body portion configured to rotate around the aforementioned rotation axis as a base axis, the aforementioned main body portion comprises a spiral contact surface, the spiral contact surface is inclined relative to the lead vertical surface and extends in a spiral shape with the aforementioned rotation axis as the center, and can contact the aforementioned article placed on the aforementioned placement portion from above. A storage rack as claimed in claim 1 or 2, wherein the aforementioned limiting member is rotated in a direction opposite to the aforementioned direction as the aforementioned article is lifted upward from the aforementioned loading portion, and retreats from directly above the aforementioned article being loaded, thereby releasing the restriction on the aforementioned article moving upward. As in the storage rack of claim 3, wherein the aforementioned limiting member has: an elastic body that applies force in a manner to rotate the aforementioned limiting member in the aforementioned other direction. As in the storage rack of claim 4, wherein the aforementioned limiting member has: a rotation damper that slows down the rotation speed of the aforementioned limiting member in another direction. The storage rack of claim 1 or 2 is provided with a positioning pin, The positioning pin is provided on the aforementioned loading portion and protrudes upward, and is used to be inserted into the recessed portion at the bottom of the aforementioned article loaded on the aforementioned loading portion, When the aforementioned article is loaded on the aforementioned loading portion, the length of the aforementioned positioning pin inserted into the aforementioned recessed portion is longer than the distance between the portion of the aforementioned limiting member that enters directly above the aforementioned article and the aforementioned article. A storage rack as claimed in claim 2, wherein, when the main body is at the first rotation position and the object is at the first height position, the object is brought into contact with the spiral contact surface, when the object is lowered from the first height position to the second height position, the object is pushed forward while sliding on the spiral contact surface, and the main body is rotated from the first rotation position to the second rotation position in the one direction, the second height position being a height position lower than the first height position and when the object is placed on the placement portion. The storage rack as claimed in claim 7, wherein, the main body portion comprises: a base provided with the spiral contact surface, and an extension portion provided integrally with the base and extending in the horizontal direction, when the main body portion is in the first rotation position, the extension portion retreats from directly above the loading area in the loading portion for loading the article, when the main body portion is in the second rotation position, the extension portion advances to directly above the article.

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