CN113662354A - Book carrier special for library book management - Google Patents

Abstract

The invention discloses a special book carrier for library book management arrangement, and relates to the technical field of library book arrangement, in particular to a base and a lifting plate, wherein first storage boxes are fixed on the left side and the right side of the upper surface of the base, a first book carrying plate is arranged inside each first storage box, a seat plate is arranged inside the base, a damping rotating shaft is arranged on the lower surface of the seat plate, a support plate is connected to the outer wall of the damping rotating shaft, and a bottom plate is arranged in the middle of the upper surface of the base. This regular special book carrier of library's library management, the books on bookshelf bottom can be deposited to first year book board in the first bin, and the inside swing joint of base has the seat, can take it out from the base is inside, and rotate the extension board through the damping pivot of its lower surface, thereby make the seat that extends support the seat that extends on ground by the extension board make things convenient for personnel to sit the return upper bracket that carries out books, need not frequent operation of bowing, the burden of staff's waist has been alleviateed.

Description

Book carrier special for library book management

Technical Field

The invention relates to the technical field of library management book arrangement, in particular to a book carrier special for library book management arrangement.

Background

The libraries are places where books are frequently read and looked up, the book collection amount of each library is large, the corresponding book borrowing amount is also large, the library staff need to put the books on the original book collection frame after each book is returned, the libraries need to regularly arrange a plurality of new books, the process needs to arrange the books on the shelf in order, the physical strength of the staff is greatly checked, and the book transport vehicle specially used for library book management arrangement is particularly important.

At present, in the process of returning and arranging books in a library, due to the fact that the heights of bookshelves where the returned books are located are different, workers need to continuously ascend and bend, the load of the bodies of the workers is increased, when a large number of new books are put on shelves, labor intensity is too high, and the book carrier special for library book management is provided for the situations.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a book carrier special for library book management arrangement, which solves the problems that in the prior art, in the process of returning and arranging books in a library, due to the fact that the heights of bookshelves where the returned books are located are different, workers need to continuously ascend and bend, the body load of the workers is increased, and the labor intensity is too high when a large number of new books are put on shelves.

In order to achieve the purpose, the invention is realized by the following technical scheme: a book carrier special for library book management regulation comprises a base and a lifting plate, wherein a first storage box is fixed on the left side and the right side of the upper surface of the base, a first book carrying plate is arranged in the first storage box, a seat plate is arranged in the base, a damping rotating shaft is arranged on the lower surface of the seat plate, a support plate is connected to the outer wall of the damping rotating shaft, a bottom plate is arranged in the middle of the upper surface of the base, a carrying seat is connected to the outer wall of the bottom plate, a first hydraulic rod is connected to the lower surface of the carrying seat, second hydraulic rods are arranged on the left side and the right side of the inner part of the carrying seat, telescopic rods are arranged on the left side and the right side of each second hydraulic rod, a rotary table is connected to the upper end of each second hydraulic rod, the rotary table is located on the upper surface of the carrying seat, a second storage box is arranged on the upper surface of the rotary table, and a second book carrying plate is arranged in the second storage box, the lower surface of the second book carrying plate is provided with a first slide rail, the outer wall of the second storage box is provided with a clamping groove, the clamping groove is located below the first slide rail, the lifting plate is arranged in the middle of the upper surface of the bearing seat, the lower surface of the bearing seat is connected with a third hydraulic rod, the left side and the right side of the upper surface of the bearing seat are connected with connecting plates, clamping blocks are fixed on the outer walls of the connecting plates, the second slide rail is arranged on the upper surface of the connecting plates, an adjusting lead screw is arranged inside the lifting plate, the outer wall of the adjusting lead screw is connected with a connecting block, the upper end of the connecting block is connected with a bearing plate, the lower surface of the bearing plate is connected with a third slide rail, a fixed sleeve block is fixed on the outer wall of the bearing plate, the inner wall of the fixed sleeve block is connected with a movable rod, the tail end of the movable rod is connected with a limiting plate, and the limiting plate is located inside the bearing plate.

Optionally, the first book carrying plate is movably connected with the first storage box, the first storage box is symmetrically distributed about the vertical center line of the base, and the first storage box is fixedly connected with the base.

Optionally, the support plate passes through the damping rotating shaft and forms a rotating structure with the seat plate, the tail end of the seat plate is convex, and the vertical center line of the seat plate coincides with the vertical center line of the base.

Optionally, the second bin passes through the second hydraulic stem and bears and constitutes adjustable structure between the seat, and the second bin passes through the carousel and bears and constitute rotating-structure between the seat, bears seat and bottom plate moreover and constitutes elevation structure through between first hydraulic stem and the base.

Optionally, the second storage box is internally distributed with second book carrying plates at equal intervals, and the second book carrying plates form a movable structure with the second storage box through the first slide rail.

Optionally, the lifting plate forms a lifting structure through the third hydraulic rod and between the bearing seat, the lifting plate is movably connected with the connecting plate, and the connecting plate forms a clamping structure through the clamping block, the clamping groove and the second storage box.

Optionally, the second slide rail is symmetrically distributed about the perpendicular bisector of the connecting plate, and the second slide rail and the first slide rail are located on the same horizontal line.

Optionally, the loading board constitutes the revolution mechanic through adjusting between lead screw and connecting block and the lift plate, and the loading board passes through to constitute sliding construction between third slide rail and the lift plate, and the loading board is half open-ended moreover.

Optionally, the limiting plate passes through the movable rod and constitutes the active structure between fixed nest of blocks and the loading board, and the internal orifice size of loading board is identical with the external orifice size of limiting plate, is vertical distribution moreover between limiting plate and the loading board bottom surface.

The invention provides a book carrier special for library book management regularity, which has the following beneficial effects:

1. this regular special book carrier of library's library management, the books on bookshelf bottom can be deposited to first year book board in the first bin, and the inside swing joint of base has the seat, can take it out from the base is inside, and rotate the extension board through the damping pivot of its lower surface, thereby make the seat that extends support the seat that extends on ground by the extension board make things convenient for personnel to sit the return upper bracket that carries out books, need not frequent operation of bowing, the burden of staff's waist has been alleviateed.

2. This regular special book carrier of library's library management, equidistant distribution has the second to carry the book board in the second bin, it is by supreme lower high books of classification in proper order of putting, and the staff can stand in bottom plate department and carry out the operation of putting on the shelf of returning of corresponding books to higher bookshelf department through first hydraulic stem lifting, the degree of difficulty that personnel ascend a height the operation has been alleviateed, and the second bin can rotate through the carousel, the another side second of being convenient for take carries the books in the book board, make the capacity and the classification ability of bin improve greatly.

3. This regular special book carrier of library's books management, the third hydraulic stem can drive the lifting plate and rise to corresponding second and carry book board department, and make the fixture block of its outer wall in the draw-in groove of corresponding second bin outer wall through the connecting block of pulling lifting plate upper surface, the second slide rail of connecting block upper surface and the first slide rail of second year book board lower surface dock mutually this moment, thereby be convenient for carry book board pulling to the connecting block upper surface with the second, thereby made things convenient for the staff greatly to its inside observation that holds books, and be favorable to the staff to carry out the operation of putting on the shelf.

4. This regular special book carrier of library's library management, the accessible rotation regulation lead screw drives the new book in the loading board and removes to the bookshelf surface to through the movable rod of pressing down the loading board outer wall, make its terminal limiting plate support books, adjust the lead screw through opposite rotation immediately and make the loading board toward retrieving contract, and books fixed through the limiting plate can stop on the bookshelf surface along with withdrawing of loading board, and its process can unify the putting on shelf to books of a large amount, has alleviateed staff's intensity of labour greatly.

5. This regular special book carrier of library's library management has made things convenient for the staff to carry out the return of lower books and has put on the shelf through the first book carrier and the seat that set up, and is favorable to carrying out the operation of putting on the shelf to higher books through the seat of bearing that can lift and bottom plate, and the loading board cooperation limiting plate can carry out new books of a large amount and put on the shelf, has alleviateed staff's intensity of labour greatly.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic top view of the present invention;

FIG. 4 is a schematic perspective view of a carrier plate according to the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 1 according to the present invention;

FIG. 6 is an enlarged view of the structure at B in FIG. 2 according to the present invention.

In the figure: 1. a base; 2. a first storage tank; 3. a first book carrier; 4. a seat plate; 5. a damping rotating shaft; 6. a support plate; 7. a base plate; 8. a bearing seat; 9. a first hydraulic lever; 10. a second hydraulic rod; 11. a telescopic rod; 12. a turntable; 13. a second storage tank; 14. a second book carrier; 15. a first slide rail; 16. a card slot; 17. a lifting plate; 18. a third hydraulic lever; 19. a connecting plate; 20. a clamping block; 21. a second slide rail; 22. adjusting the lead screw; 23. connecting blocks; 24. a carrier plate; 25. a third slide rail; 26. fixing the sleeve block; 27. a movable rod; 28. and a limiting plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 6, the present invention provides a technical solution: a book carrier special for library book management arrangement comprises a base 1, wherein first storage boxes 2 are fixed on the left side and the right side of the upper surface of the base 1, first book carrying plates 3 are arranged inside the first storage boxes 2, seat plates 4 are arranged inside the base 1, damping rotating shafts 5 are arranged on the lower surfaces of the seat plates 4, supporting plates 6 are connected to the outer walls of the damping rotating shafts 5, a bottom plate 7 is arranged in the middle of the upper surface of the base 1, bearing seats 8 are connected to the outer walls of the bottom plate 7, the first book carrying plates 3 are movably connected with the first storage boxes 2, the first storage boxes 2 are symmetrically distributed about the vertical center line of the base 1, the first storage boxes 2 are fixedly connected with the base 1, the supporting plates 6 form a rotating structure through the damping rotating shafts 5 and the seat plates 4, the tail ends of the seat plates 4 are in a convex shape, and the vertical center line of the seat plates 4 coincides with the vertical center line of the base 1, before books are returned to the upper rack, the books at the bottom layer can be placed on the first book carrying plate 3 in the first storage box 2 for storage, the seat plate 4 is movably connected inside the base 1 and can be drawn out from the base 1, and the support plate 6 is rotated through the damping rotating shaft 5 on the lower surface of the seat plate, so that the extended seat plate 4 is supported on the ground by the support plate 6, the seat plate 4 with the protruding tail end can prevent the support plate 6 from excessively rotating, the stability of the seat plate 4 is improved, the extended seat plate 4 is convenient for a person to sit to return the upper rack for books, frequent waist bending operation is not needed, and the burden of the waist of the worker is relieved;

the lower surface of the bearing seat 8 is connected with a first hydraulic rod 9, the left side and the right side inside the bearing seat 8 are provided with a second hydraulic rod 10, the left side and the right side of the second hydraulic rod 10 are provided with telescopic rods 11, the upper end of the second hydraulic rod 10 is connected with a rotary table 12, the rotary table 12 is positioned on the upper surface of the bearing seat 8, the upper surface of the rotary table 12 is provided with a second storage box 13, the inside of the second storage box 13 is provided with a second book carrying plate 14, the lower surface of the second book carrying plate 14 is provided with a first slide rail 15, the outer wall of the second storage box 13 is provided with a clamping groove 16, the clamping groove 16 is positioned below the first slide rail 15, the second storage box 13 forms an adjustable structure through the second hydraulic rod 10 and the bearing seat 8, the second storage box 13 forms a rotating structure through the rotary table 12 and the bearing seat 8, and the bearing seat 8 and the bottom plate 7 form a lifting structure through the first hydraulic rod 9 and the base 1, second book carrying plates 14 are distributed in the second storage box 13 at equal intervals, the second book carrying plates 14 form a movable structure with the second storage box 13 through first slide rails 15, the second book carrying plates 14 are distributed in the second storage box 13 at equal intervals, and can be used for sequentially classifying and placing books with higher heights from bottom to top, a worker can stand at the bottom plate 7 and lift the books to the higher bookshelf through the first hydraulic rod 9 to return to the upper shelf, so that the difficulty of the worker in ascending operation is reduced, the height of the second storage box 13 can be adjusted through the second hydraulic rod 10, the worker can conveniently take the books in the second book carrying plates 14 on the lower layer to take the upper shelf, the telescopic rods 11 on the left side and the right side can effectively improve the ascending stability and the bearing performance of the second storage box 13, the second storage box 13 can rotate through the rotary disc 12, so that the books in the second book carrying plates 14 on the other side can be conveniently taken, the capacity and the classification capacity of the storage box are greatly improved;

the lifting plate 17 is arranged in the middle of the upper surface of the bearing seat 8, the lower surface of the bearing seat 8 is connected with a third hydraulic rod 18, the left side and the right side of the upper surface of the bearing seat 8 are connected with connecting plates 19, the outer wall of each connecting plate 19 is fixed with a clamping block 20, the upper surface of each connecting plate 19 is provided with a second sliding rail 21, an adjusting screw 22 is arranged inside the lifting plate 17, the outer wall of each adjusting screw 22 is connected with a connecting block 23, the upper end of each connecting block 23 is connected with a bearing plate 24, the lower surface of each bearing plate 24 is connected with a third sliding rail 25, the outer wall of each bearing plate 24 is fixed with a fixed sleeve block 26, the inner wall of each fixed sleeve block 26 is connected with a movable rod 27, the tail end of each movable rod 27 is connected with a limiting plate 28, each limiting plate 28 is positioned inside each bearing plate 24, each bearing plate 24 forms a movable structure with the lifting plate 17 through the adjusting screw 22 and the connecting blocks 23, and each bearing plate 24 forms a sliding structure with the lifting plate 17 through the third sliding rails 25, the bearing plate 24 is in a half-open shape, the limiting plate 28 forms a movable structure with the bearing plate 24 through the movable rod 27 and the fixed sleeve block 26, the size of the inner opening of the bearing plate 24 is matched with the size of the outer opening of the limiting plate 28, the limiting plate 28 and the bottom surface of the bearing plate 24 are vertically distributed, the lifting plate 17 can be driven by the third hydraulic rod 18 to ascend to the corresponding second book carrying plate 14 in the process of returning to the rack, the connecting plate 19 on the upper surface of the lifting plate 17 is pulled to clamp the clamping block 20 on the outer wall of the lifting plate 17 in the corresponding clamping groove 16 on the outer wall of the second storage box 13, the second sliding rail 21 on the upper surface of the connecting plate 19 is butted with the first sliding rail 15 on the lower surface of the second book carrying plate 14, so that the second book carrying plate 14 is conveniently pulled to the upper surface of the connecting plate 19, the observation of books contained in the connecting plate by workers is greatly facilitated, and the racking operation by the workers is facilitated, in the process of putting a large number of new books on shelf, the new books can be placed in the second book carrying plate 14 for classified storage, the needed books put on shelf are placed in the carrying plate 24 for storage according to requirements, meanwhile, the books can be lifted to a designated bookshelf layer through the third hydraulic rod 18, the connecting block 23 on the lower surface of the carrying plate 24 is connected with the adjusting screw rod 22, the books in the carrying plate 24 are driven to move to the bookshelf surface through rotating the adjusting screw rod 22, the limiting plate 28 at the tail end of the carrying plate 24 is pressed against the books through pressing the movable rod 27 on the outer wall of the carrying plate 24, the carrying plate 24 is retracted through rotating the adjusting screw rod 22 reversely, the books fixed through the limiting plate 28 can stay on the bookshelf surface along with the evacuation of the carrying plate 24, the books can be put on shelf uniformly in the process of putting a large number of books, and the labor intensity of workers is greatly relieved.

In conclusion, when the special book carrier for library book management arrangement is used, firstly, books at the bottom layer can be placed on the first book carrying plate 3 in the first storage box 2 for storage before the books are returned to the upper rack, the seat plate 4 is movably connected inside the base 1 and can be drawn out from the base 1, and the support plate 6 is rotated through the damping rotating shaft 5 on the lower surface of the seat plate 4, so that the extended seat plate 4 is supported on the ground by the support plate 6, the seat plate 4 with the protruding tail end can prevent the support plate 6 from excessively rotating, the stability of the seat plate 4 is improved, the extended seat plate 4 is convenient for people to return to the upper rack for book seating, frequent stooping operation is not needed, and the burden of the waist of the staff is relieved;

then, in the process of putting on the shelf of the high-rise books in progress, second book carrying plates 14 are distributed in the second storage box 13 at equal intervals, the books with higher height can be sequentially classified and placed from bottom to top, and workers can stand on the bottom plate 7 and lift the books to the higher bookshelf through the first hydraulic rod 9 to return the corresponding books to the upper shelf, so that the difficulty of ascending operation of the workers is reduced, since the height of the second storage box 13 can be adjusted by the second hydraulic rod 10, the books in the lower second book carrying plate 14 can be conveniently taken by the worker for putting on the shelf, and the telescopic rods 11 on the left and right sides can effectively improve the ascending stability and the bearing performance of the second storage box 13, the second storage box 13 can rotate through the rotary disc 12, so that books in the second book carrying plate 14 on the other side can be taken conveniently, and the capacity and the classification capacity of the storage box are greatly improved;

then, in the process of returning to and putting on shelf, the lifting plate 17 can be driven by the third hydraulic rod 18 to ascend to the corresponding second book carrying plate 14, the connecting plate 19 on the upper surface of the lifting plate 17 is pulled to clamp the clamping block 20 on the outer wall of the lifting plate in the clamping groove 16 on the outer wall of the corresponding second storage box 13, and at the moment, the second sliding rail 21 on the upper surface of the connecting plate 19 is butted with the first sliding rail 15 on the lower surface of the second book carrying plate 14, so that the second book carrying plate 14 is conveniently pulled to the upper surface of the connecting plate 19, the observation of books contained in the connecting plate is greatly facilitated for workers, and the worker can conveniently carry out the operation of putting on shelf;

finally, in the process of putting a large number of new books on shelf, the new books can be placed in the second book carrying plate 14 for classified storage, the needed books put on shelf are placed in the carrying plate 24 for storage according to requirements, meanwhile, the books can be lifted to a designated bookshelf layer through the third hydraulic rod 18, the connecting block 23 on the lower surface of the carrying plate 24 is connected with the adjusting screw rod 22, the books in the carrying plate 24 are driven to move to the bookshelf surface through rotating the adjusting screw rod 22, the limiting plate 28 at the tail end of the carrying plate 24 is pressed against the books through pressing the movable rod 27 on the outer wall of the carrying plate 24, the carrying plate 24 is retracted through rotating the adjusting screw rod 22 reversely, the books fixed through the limiting plate 28 can stay on the bookshelf surface along with the evacuation of the carrying plate 24, the process can be unified for putting on shelf of a large number of books, and the labor intensity of workers is greatly reduced.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims (9)

1. The utility model provides a regular special book carrier of library's book management, includes base (1) and lift plate (17), its characterized in that: the book shelf is characterized in that first storage boxes (2) are fixed on the left side and the right side of the upper surface of a base (1), a first book carrying plate (3) is arranged in each first storage box (2), a seat plate (4) is arranged in each base (1), a damping rotating shaft (5) is arranged on the lower surface of each seat plate (4), a support plate (6) is connected to the outer wall of each damping rotating shaft (5), a bottom plate (7) is arranged in the middle of the upper surface of each base (1), a bearing seat (8) is connected to the outer wall of each bottom plate (7), a first hydraulic rod (9) is connected to the lower surface of each bearing seat (8), second hydraulic rods (10) are arranged on the left side and the right side of the inner portion of each bearing seat (8), telescopic rods (11) are arranged on the left side and the right side of each second hydraulic rod (10), a rotary table (12) is connected to the upper end of each second hydraulic rod (10), and the rotary table (12) is located on the upper surface of each bearing seat (8), a second storage box (13) is arranged on the upper surface of the rotary table (12), a second book carrying plate (14) is arranged inside the second storage box (13), a first slide rail (15) is arranged on the lower surface of the second book carrying plate (14), a clamping groove (16) is formed in the outer wall of the second storage box (13), the clamping groove (16) is located below the first slide rail (15), the lifting plate (17) is arranged in the middle of the upper surface of the bearing seat (8), the lower surface of the bearing seat (8) is connected with a third hydraulic rod (18), the left side and the right side of the upper surface of the bearing seat (8) are connected with connecting plates (19), clamping blocks (20) are fixed on the outer wall of the connecting plates (19), a second slide rail (21) is arranged on the upper surface of the connecting plates (19), an adjusting lead screw (22) is arranged inside the lifting plate (17), and the outer wall of the adjusting lead screw (22) is connected with a connecting block (23), and the upper end of connecting block (23) is connected with loading board (24), the lower surface of loading board (24) is connected with third slide rail (25), and the outer wall of loading board (24) is fixed with fixed nest of blocks (26), the inner wall connection of fixed nest of blocks (26) has movable rod (27), and the end-to-end connection of movable rod (27) has limiting plate (28), limiting plate (28) are located the inside of loading board (24).

2. The book carrier special for library book management regulation according to claim 1, characterized in that: the book storage box is characterized in that the first book carrying plate (3) is movably connected with the first storage box (2), the first storage box (2) is symmetrically distributed about the vertical center line of the base (1), and the first storage box (2) is fixedly connected with the base (1).

3. The book carrier special for library book management regulation according to claim 1, characterized in that: the supporting plate (6) and the seat plate (4) form a rotating structure through the damping rotating shaft (5), the tail end of the seat plate (4) is convex, and the vertical center line of the seat plate (4) is coincided with the vertical center line of the base (1).

4. The book carrier special for library book management regulation according to claim 1, characterized in that: the second storage box (13) forms an adjustable structure between the second hydraulic rod (10) and the bearing seat (8), the second storage box (13) forms a rotating structure between the turntable (12) and the bearing seat (8), and the bearing seat (8) and the bottom plate (7) form a lifting structure between the first hydraulic rod (9) and the base (1).

5. The book carrier special for library book management regulation according to claim 1, characterized in that: second book carrying plates (14) are distributed in the second storage box (13) at equal intervals, and the second book carrying plates (14) form a movable structure with the second storage box (13) through first sliding rails (15).

6. The book carrier special for library book management regulation according to claim 1, characterized in that: the lifting plate (17) forms a lifting structure with the bearing seat (8) through a third hydraulic rod (18), the lifting plate (17) is movably connected with a connecting plate (19), and the connecting plate (19) forms a clamping structure with the second storage box (13) through a clamping block (20) and a clamping groove (16).

7. The book carrier special for library book management regulation according to claim 1, characterized in that: the second slide rail (21) is symmetrically distributed about the perpendicular bisector of the connecting plate (19), and the second slide rail (21) and the first slide rail (15) are located on the same horizontal line.

8. The book carrier special for library book management regulation according to claim 1, characterized in that: bearing board (24) constitute the active structure through adjusting between lead screw (22) and connecting block (23) and lift plate (17), and bearing board (24) constitute sliding construction through between third slide rail (25) and lift plate (17), and bearing board (24) are half open-ended moreover.

9. The book carrier special for library book management regulation according to claim 1, characterized in that: the limiting plate (28) forms a movable structure with the bearing plate (24) through the movable rod (27) and the fixed sleeve block (26), the size of the inner opening of the bearing plate (24) is matched with that of the outer opening of the limiting plate (28), and the limiting plate (28) and the bottom surface of the bearing plate (24) are vertically distributed.

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