JPH0432480Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a component of an aluminum alloy chick tier, and its purpose is that when used as a stationary type, it has strong assembly strength and can be permanently installed, and can be disassembled compactly. This makes it convenient to transport and store, and since it can be assembled by simply screwing in a few bolts and engaging an L-shaped locking metal fitting, assembly work is simplified, and each member reinforces each other despite the small number of parts. Therefore, the shape is maintained firmly, and the L-shaped locking metal fittings allow the spanboard to be erected without wobbling or falling off, making it possible to use the spanboard while riding safely and comfortably. In order to provide a constituent member of an aluminum alloy hinge stage that can be used permanently or for general purposes depending on the purpose, as it is possible to erect and extend the spanning board in the width direction without any steps with a simple assembly process as described above. be.

(Prior art and its problems) Conventionally, there is a type of chick stage shown in Fig. 10,
This chick tier a consists of a box body that is integrally molded in the shape of a step.In this chick tier a, you can ride on each step and use it for taking group photos, etc. However, because it is integrally molded, it can be disassembled. This required a large amount of space for transportation and storage.

Therefore, prior to this idea, this inventor made the first
We designed the chick stage b shown in Figure 1.

The structural members of the chick tier b in this draft example are constructed between two foundation frames c formed in a step-like manner and two foundation frames c arranged in parallel at a predetermined interval in the width direction, above each tier. It consists of two spanning boards d and a ladder-shaped connecting member e installed at the rear, and the base frame c has two long vertical bars f and one short bar arranged in parallel at regular intervals. An upper crosspiece h and a lower crosspiece i are placed at the upper and lower positions between the vertical crosspieces g.
Two locking protrusions j are provided in the depth direction on the upper crosspiece h, and fixing nuts k are provided at the upper and lower positions of the elongated vertical crosspiece f, respectively. In addition, two locking holes l that engage with the locking protrusions j are formed at both ends of the spanning plate d, and the fixing nuts k are installed at each end of the connecting member e. Mounting bolt m to be screwed on
is provided.

According to the constituent members of the chick tier b, the chick tier b can be assembled and disassembled. To assemble the chick tier b, the mounting bolts m at both ends of the connecting member e are screwed into the fixing nuts k of the two base frames c. Then, these two base frames c are fixed side by side at a constant interval in the width direction, and the engagement holes l on both ends of the spanning board d are engaged with the locking protrusions j of the opposing upper crosspiece h. d can be constructed in the form of two steps, upper and lower.

On the other hand, in order to disassemble this chick stage b, remove the engaging hole l from the locking projection j, remove this span plate d from the base frame c, and remove the mounting bolt m from the fixing nut k. The connecting member e can be removed from the base frame c.

As mentioned above, the components of the chick stage b of this draft example can be assembled by simply screwing the mounting bolt m into the fixing nut k and engaging the engagement hole l with the locking protrusion j. On the other hand, since disassembly is performed only by releasing these, the assembly and disassembly work is simple, and when disassembled, the chick stage b can be compactly returned to each component, reducing the space required for transportation and storage. We were able to.

However, in the chick stage b of this draft example, when a person stands on the spanboard d in the assembled state, of the loads that the two foundation frames c receive, those in the direction away from and towards the two foundation frames c are Although it is received by the connecting member e at the rear, it is only received by the engagement hole l that engages with the locking protrusion j at the top, and it is not received at all at the front, so there is a problem with its robustness, and it cannot be permanently installed. It was not suitable as a type chick. Furthermore, in this chick stage b, the spanning board d is locked onto the base frame c only by the engagement of the engagement hole l with the locking pin j, so the spanning board d is If it is not locked in any way and is subjected to an upward load due to wind blowing up, feet getting caught, etc., there is a risk that the spanboard d may lift up or come off the base frame c. Moreover, a gap was likely to be formed between the span board d and the base frame c, causing problems such as the span board d rattling and making noise.

In addition, when taking a group photo of a large number of people, it is possible to arrange the chick tiers in parallel in the width direction and extend the span plate d in the width direction, but since the adjacent base frames c are not connected to each other, The height of the base frame c differs due to the difference in the unevenness of the platform c, and a difference in level occurs between the end faces of the adjacent gangplank d, and when a person riding on the end of the gangplank d moves onto the adjacent gangplank d. I tripped and fell,
There was a risk of falling from the gangplank d.

In addition, it was also used as a stage for group photos, etc. in the 60s.
Publication No. 143898 discloses a "support frame for a step stool."

This technology was a ``support frame for a step stool'' that made it convenient to carry and handle by providing an opening prevention metal fitting to prevent the leg frame from opening.

However, this disclosed technique also
Similar to the chick stage b shown in the figure, when a person stands on the step support frame in the assembled state, the load applied to the step support frame in the direction away from and towards the both leg frames is absorbed by the arm at the rear. However, the upper part only receives the locking pin and the inserted locking hole, and the front part does not receive it at all, so there is a problem with its robustness, making it unsuitable for use as a permanent stationary chick tier. .

Moreover, in this "step stool support frame," the tread is locked onto the leg frames only by inserting the locking pin into the locking hole, as described above, so the tread cannot be moved upward. If it is not locked in any way and is subjected to an upward load due to wind blowing up, feet getting caught, etc., this step board may lift up or come off the leg frame. In addition, there was a problem that gaps were likely to be formed between the tiers and the leg frames, causing the tiers to rattle and make noise.

Further, ``Connected Assembly Bench'' is also disclosed in Japanese Utility Model Application Publication No. 48-57308.

This technique was developed for the purpose of easy and quick assembly, and in particular, as shown in Figure 5 of the publication, conventionally, after pressing the support plate against the boundary of the plate, both sides of the support plate are This technique was developed to overcome the drawbacks of the technique of holding and connecting with a letter-shaped nut.

Although this disclosed technology is an excellent technology for a ``bench'', it cannot be applied to a ``chick'' stage on which a large number of people can sit at the same time.

In other words, the "connection technology" disclosed in this "connection type assembly bench" is a technology that involves inserting protruding rods provided in the connection direction into insertion holes, so it is difficult for a large number of people to sit on the bench at once. As for the "Hina stage" where frequent movement of people is expected on the platform,
There were problems with safety and robustness, and especially if the protruding rod broke due to the load on the table, it could pose a serious danger, so this technology could not be adopted as a ``chick stage.''

In addition, regarding the connection technology using "L-shaped nuts" which is described as the prior art from which this technology was created, each time the spanboard is connected, the L-shaped nuts at both ends are tightened with bolts, etc. It had to be screwed on, making it difficult to quickly assemble it for group photos.

Also, regarding the load of the person placed on the table,
Since this "L-shaped nut" has a gap between it and the support plate, there is a risk that the load applied in the upper and width directions will not be evenly received by the lower support plate and will be transmitted unevenly. , there were safety issues.

(Means for solving the problem) This invention was made to solve the above problem.
A plurality of spanning boards constructed on each stage between the foundation frames arranged in parallel at predetermined intervals in the width direction, and one or more cross-shaped connecting members interposed at the rear;
The base frame is composed of one or more connecting plates interposed at the front lower part, and the base frame has two long vertical bars arranged in parallel, and one or more connecting plates arranged in parallel with these long vertical bars. A plurality of rectangular vertical bars are formed to be gradually lower in the parallel direction, an upper bar is installed horizontally between the upper parts of the vertical bars that face each other, and each of the upper bars is interposed between the lower parts of these vertical bars. The long vertical bar has two rows of fixing nuts arranged above and below in parallel in the width direction, and the short vertical bar has fixing nuts arranged at the bottom. Two L-shaped locking metal fittings are arranged in parallel in the width direction, and the L-shaped locking metal fittings are vertically arranged on the lower surface of both ends of the spanning plate, and the outer edges thereof are formed along the front and rear surfaces of the vertical beams. the L-shaped locking metal fitting is suspended from the end surface in the width direction of the spanning board at a distance of less than half the width of the upper crosspiece, and a hanging piece formed in contact with a side surface of the upper crosspiece; A bent piece is bent from the tip edge of the hanging piece and is formed along the lower surface of the upper crosspiece so that the width thereof is less than half of the width of the upper crosspiece, and the bent piece is formed in the cross-shaped shape. The connecting members are pivotally connected to each other at their central portions, and have mounting bolts at each end that are screwed into the fixing nuts.
It consists of a main bracing board, each edge of the bracing board being set within half the width of an elongated vertical beam to which the bracing board is attached via mounting bolts, and the connecting board is An aluminum alloy chick stage, characterized in that mounting bolts are provided at both ends thereof, and both ends of the connecting plate are set within half the width of the rectangular vertical beam attached via the mounting bolts. All of the above problems are solved by providing the following structural members.

(Example) An embodiment of this invention will be described based on the drawings.

1 to 8 are diagrams for explaining the constituent members of an aluminum alloy chick stage according to an embodiment of this invention.

As shown in FIG. 1, this component is composed of a plurality of base frames 1, a plurality of spanning boards 2, one or more cross-shaped connecting members 3, and one or more connecting plates 4. has been done.

The base frame 1 includes two long vertical bars 5 arranged in parallel, one or more short vertical bars 6 arranged in parallel with these long vertical bars 5, and each vertical bar facing each other. It is formed into a step-like shape with an upper crosspiece 7 horizontally suspended between the upper portions of the vertical crosspieces, and a lower crosspiece 8 interposed between the lower portions of the vertical crosspieces.

Of these, the long vertical bar 5 has two rows of fixing nuts 9 arranged above and below in parallel in the width direction, and the short vertical bar 6 has two fixing nuts 9 arranged at the bottom. They are arranged in parallel in the width direction.

The spanning board 2 is formed in the shape of a rectangular plate that is elongated in the width direction and has the same depth and length as the upper crosspiece 7.

As shown in FIG. 2A and FIG. 5, this span plate 2 has walls arranged in parallel in the depth direction on the lower surface of both ends, and an outer edge 10 is formed along the front surface 11 and rear surface 11' of the vertical crosspiece. An L-shaped locking metal fitting 12 is installed vertically, and this L-shaped locking metal fitting 12 extends from the width direction end surface 13 of the span plate 2 to the upper crosspiece 7 as shown in FIG. 2B.
A hanging piece 15 is formed along the side surface 14 of the upper crosspiece 7 and is bent at a distance of less than half the width t-1 of the upper crosspiece 7. The bent piece 16 is formed along the lower surface 14' of the upper crosspiece 7 and has a width less than half the width t-1 of the upper crosspiece 7.

As shown in FIG. 1, the cross-shaped connecting member 3 has two mounting bolts 18 that are pivotally connected to each other at the center via a pivot joint 17 and are screwed into the fixing nuts 9 at each end. It consists of 19 bracing plates.

Each end edge 20 of this brace plate 19 is held within the width t-2 half of the elongated vertical beam 5 to which this brace plate 19 is attached via mounting bolts 18, as shown in FIG. .

The connecting plate 4 is provided with mounting bolts 18 at both ends as shown in FIG. It is held within the width t-3 half of the rectangular vertical beam 6.

The spanning board 2 is composed of a plurality of unit plates 22 connected in the depth direction, as shown in FIG. The part 23 has a protruding piece 2 on the lower edge.
4 are formed respectively, and a recessed step 23 is formed on the upper edge of the other side, and a protruding piece 24 is formed on the lower edge, and the protruding pieces 24 are formed between the opposing end faces in the depth direction of the adjacent unit plates 22. and recessed step part 2
3 are mutually fitted, and this fitted protrusion 24
and the recessed stepped portion 23 are fastened together by a rivet 25.

Further, as shown in FIG. 1, the lower end of the vertical bar extends below the lower bar 8, and a recessed space 26 is formed below the lower bar 8.

All of the constituent members described above, except for the fixing nut 9, the pivot joint 17, the mounting bolt 18, and the brace plate 19, are molded from aluminum alloy.

The fixing nut 9, pivot joint 17, and mounting bolt 18 are made of steel or other desired metal or plastic material, and the brace plate 19 is made of steel or other desired metal material, but all of these are made of aluminum. Good too.

One embodiment of this invention is constructed as described above, and in order to assemble the chick tier using each component, as shown in FIG. 5, the mounting bolts 18 at both ends of the brace plate 19 are screwed into the fixing nuts 9 to connect the rear halves of the two base frames 1 via the cross-shaped connecting members 3, and then the two base frames Both ends of the span plate 2 are placed between the upper parts of the upper crosspieces 7 facing each other in the width direction of the frame 1, and L-shaped locking fittings 1 are vertically installed at both ends of the span plate 2.
2 are engaged with opposite half portions of the upper crosspieces 7 in the width direction, and the span plates 2 are respectively constructed between the upper parts of the opposing upper crosspieces 7 of the two base frames 1, and then the two base frames The mounting bolts 18 at both ends of the connecting plate 4 are screwed into the fixing nuts 9 on the inside of the short vertical beam 6 of 1, and the front half parts of the two base frames 1 are connected via the connecting plate 4. .

To take a group photo using this assembled chick tier, it is sufficient to stand on each spanning board 2, and as is clear from FIG. Of these, the load applied in the separation direction is received by the cross-shaped connecting members 3 and the connecting plate 4, while the load applied in the adjacent direction is received by the hanging piece of the L-shaped locking fitting 12 that is in contact with the side surface 14 of the upper crosspiece 7. 15
The connecting plate 2, the cross-shaped connecting member 3 and the connecting plate 4 via
It can be accepted.

In addition, among the loads applied to the span plate 2, the load applied downward is received by the vertical crosspiece via the upper crosspiece 7 that is in contact with the lower surface of both ends of the span plate 2, and the load applied upward is received by the L-shaped locking metal fittings. The load applied in the width direction is received by the upper crosspiece 7 through the lower surface 14' of the upper crosspiece 7 that is in contact with the bent piece 16 of the L-shaped locking fitting 12. The load applied in the depth direction is received by the upper crosspiece 7 via the side surface 14 of the vertical crosspiece 7, and the load applied in the depth direction is transferred to the front surface 11 of the vertical crosspiece that is in contact with the outer edge 10 of the L-shaped locking fitting 12, as shown in FIG. Rear side 1
1' and is received by each vertical beam.

Moreover, the convex portions on the ground surface can be absorbed by the recessed space 26, so that the foundation frame 1 does not tilt.

To take a group photo of a large number of people, as shown in Fig. 9, the base frames 1 are arranged in parallel in the width direction of the chick tiers assembled as described above, and the spanning boards 2 and cross It is only necessary to interpose the cross-shaped connecting members 3 and the connecting plates 4, and the span plate 2 can be constructed and extended in the width direction on the base frame 1 connected in the width direction by the cross-shaped connecting members 3 and the connecting plates 4.

In this case, as described above, the openings 13 of the adjacent spanboards 2 are connected to each other because the hanging pieces 15 of the L-shaped locking fittings 12 are suspended at a position less than half the width t-1 of the upper crosspiece 7. Also, the bent pieces 16 of the spanning board 2 do not interfere with each other because each bent piece 16 has a width less than half of the width t-1 of the upper crosspiece 7. The edges 20 do not interfere with each other because the edges 20 are kept within the width t-2 half of each, and the connecting plates 4
The edges 21 of the two do not interfere with each other because they are kept within the width t-3 half of the rectangular vertical beam 6.

To store or transport this chick stage, as is clear from FIG.
At the same time, it is sufficient to release the engagement between the L-shaped locking metal fittings 12 of the spanning board 2 and the upper crosspiece 7 of the base frame 1, and this chick stage can be reduced to each component and made compact. can do.

In particular, the cross-shaped connecting member 3 can be made compact by making the two bracing plates 19 parallel to each other at the pivot portion 17.

Note that this chick tier may need to be of various sizes depending on the application, so especially when the base frame 1 with the upper crosspiece 7 of various lengths and short lengths is manufactured in various sizes, the span plate 2 can be adjusted in depth and width. It is necessary to manufacture products with various lengths and short lengths.

In this case, span plates 2 of various sizes can be manufactured by combining unit plates 22 having a certain length and depth, and each unit plate 22 is formed by fitting a recessed step 23 and a projecting piece 24. Since they are joined together, there is no difference in level and there is no play.

To summarize the above, in order to assemble the chick stage with this component, it is only necessary to screw the mounting bolt 18 into the fixing nut 9 and to engage the L-shaped locking fitting 12 with the upper crosspiece 7.

During use, among the loads applied to the base frame 1, the load in the away direction is applied to the cross-shaped connecting members 3 and the connecting plate 4, and the load in the approaching direction is applied to the cross-shaped connecting members 3, the connecting plate 4, and the L-shaped locking metal fitting 12. of the load applied to the spanning plate 2, the downward load is received by the vertical crosspiece, and the upward load is received by the upper crosspiece 7 via the L-shaped locking fitting 12, and the width The load in the direction is received by the upper crosspiece 7 via the L-shaped locking metal fitting 12, and the load in the depth direction is received by the vertical crosspiece via the L-shaped locking metal fitting 12.

Further, the unit plates 22 constituting the spanning plate 2 are mutually supported by the engagement between the recessed step portion 23 and the protruding piece 24 without any difference in level or play.

When taking a group photo of a large number of people, use the same assembly procedure as described above to erect and extend the span plate 2 in the width direction on the base frame 1 which is connected in the width direction with the intersecting connecting members 3 and connecting plates 4. It can be done by

In this case, the openings 13 of adjacent spanning boards 2, the bent pieces 16 of the L-shaped locking fittings 12, the edges 20 of the bracing plates 19, and the edges 21 of the connecting plates 4 interfere with each other. It can be assembled without any preparation.

To store or transport, it is only necessary to screw in the mounting bolts 18 and fixing nuts 9 and to release the engagement between the L-shaped locking metal fittings 12 and the upper crosspiece 7, and it is enough to restore each component, especially the cross-shaped connecting members. 3 can be made more compact by making the brace plates 19 parallel.

(Effects) As explained above, this invention consists of a plurality of foundation frames formed in a step-like manner, and a plurality of foundation frames installed on each step between the foundation frames arranged in parallel at predetermined intervals in the width direction. A gangboard, one or more cross-shaped connecting members interposed at the rear, and one interposed at the front lower part.
The base frame is composed of two long vertical bars arranged in parallel, and one long vertical bar arranged in parallel with these long vertical bars, or formed gradually lower in the parallel direction. It is formed from a plurality of short vertical bars, an upper bar horizontally suspended between the upper parts of the vertical bars facing each other, and a lower bar interposed between the lower parts of the vertical bars, Of these, the long vertical bar has two rows of fixing nuts arranged above and below in parallel in the width direction, and the short vertical bar has two fixing nuts arranged in the lower part in parallel in the width direction. L-shaped locking metal fittings are vertically arranged on the lower surfaces of both ends of the spanning board, and the outer edges thereof are formed along the front and rear surfaces of the vertical beams. The metal fitting is suspended from the end face in the width direction of the spanning board at a distance of less than half the width of the upper crosspiece, and includes a hanging piece formed in contact with the side surface of the upper crosspiece, and a hanging piece that is folded from the tip edge of the hanging piece. a bent piece formed along the lower surface of the upper crosspiece and having a width less than half the width of the upper crosspiece;
and the cross-shaped connecting member consists of two brace plates that are pivotally connected to each other at the center and have mounting bolts at each end that are screwed into the fixing nuts,
Each edge of this brace plate is set within half the width of the elongated vertical beam to which this brace plate is attached via mounting bolts, and the connecting plate is provided with mounting bolts at both ends thereof. It is a component of an aluminum alloy chick stage, characterized in that both edges of the connecting plate are set within half the width of the short vertical beam attached via the mounting bolts, so the following. be effective.

With this component, in order to assemble the chick stage, it is only necessary to screw the mounting bolt into the fixing nut and engage the L-shaped locking metal fitting with the upper crosspiece, which simplifies the assembly work.

During use, among the loads applied to the foundation frame, the load in the away direction is handled by the cross-shaped connecting members and connecting plates, and the load in the approaching direction is handled by the cross-shaped connecting members and connecting plates, as well as by the spanning plate via the L-shaped locking fittings. Of the load applied to the spanboard, the downward load is received by the vertical crosspiece, the upward load is received by the upper crosspiece via the L-shaped locking fitting, and the load in the width direction is received by the L-shaped locking bracket. The load in the depth direction is received by the upper crosspiece via the metal fittings, and the load in the depth direction is received by the vertical crosspiece via the L-shaped locking metal fittings, so each member reinforces each other and retains its shape firmly even though the number of parts is small. In addition, the L-shaped locking fittings allow the spanboard to be erected without rattling or falling off, allowing for safe and comfortable riding on the spanboard, and sufficient use even when permanently installed indoors or outdoors. It can be served to

When taking a group photo of a large number of people, it is possible to erect and extend a span plate in the width direction on the base frame which is connected in the width direction with cross-shaped connecting members and connecting plates using the same operation as the above assembly. There is no step difference between the end faces of adjacent gangplanks as in the past, and there is no risk of tripping over the adjoining gangplank and falling off, making it versatile and safe depending on the application. Can be used for

In this case, the widthwise end faces of adjacent gangplanks,
The bent pieces of the L-shaped locking metal fittings, the edges of the bracing plates, and the edges of the connecting plates can be assembled without any interference without interference.

To store or transport, all you have to do is screw in the mounting bolts and fixing nuts and release the engagement between the L-shaped locking metal fittings and the upper frame. Since the paddle boards can be made parallel and compact, they do not take up much space and are convenient to store and transport.

In this invention, in particular, the spanning board is composed of a plurality of unit plates connected in the depth direction, and one of the unit plates has a recessed step on the upper edge and a protrusion on the lower edge. are formed respectively, and protrusions are formed on the lower edges of the stepped portions on the upper edge of the other side, and the protruding pieces and the stepped portions on the opposite end faces in the depth direction of the adjacent unit plates are mutually formed. When the fitted protrusion and step are fastened together, span plates with various depths and widths suitable for large and small foundation frames with upper crosspieces formed in various lengths can be used. It can be manufactured by combining unit plates with a constant depth and width, so there is no need to mold each type of spanning plate with a different depth and width, and unit plates with a constant shape can be used universally.
Moreover, in this case, each unit plate is engaged without any difference in level or play due to the engagement between the recessed step and the protruding piece, so there is no unpleasant noise caused by feet getting caught on the gangboard or play, and safety is ensured. and comfortable to use.

In this invention, in particular, when the lower end of the vertical rung extends below the lower rung and a recessed space is formed below the lower rung, the convex part of the ground surface is absorbed into this recessed step. As a result, there is no inclination of the base frame, so the spanboard can be erected more horizontally without depending on the unevenness of the ground surface, and it can also be used outdoors.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the constituent members of an aluminum alloy chick stage according to an embodiment of this invention, Fig. 2A is a perspective view of the L-shaped locking fitting in the engaged state, and Fig. 2B is - sectional view, Fig. 3A is an explanatory diagram of the installation state of the brace plate of the same example, Fig. 3B is a - sectional view, Fig. 4 is an explanatory diagram of the installation state of the connecting plate of the same example, and Fig. 5 is an illustration of the installation state of the same example. FIG. 6 is a front view of the example, FIG. 7 is a plan view, FIG. 8 is a sectional view, FIG. 9 is a front view of the extended state, FIG. 10 is an explanatory diagram of the prior art, FIG. 11 is an explanatory diagram of an existing example. 1... Foundation frame, 2... Spanning board, 3... Cross-shaped connecting members, 4... Connecting plates, 5... Long vertical bars, 6... Short vertical bars, 7... Top bars, 8... ...Lower bar, 9...Fixing nut, 10...Outer edge, 11...Front, 11'...
... Rear surface, 12 ... L-shaped locking metal fitting, 13 ... Width direction end surface, 14 ... Side surface, 14' ... Bottom surface, 15 ...
... hanging piece, 16... bending piece, 17... pivoting part, 1
8...Mounting bolt, 19...Brace plate, 20...
Edge, 21... Edge, 22... Unit plate, 23
... Recessed stepped portion, 24 ... Protruding piece, 25 ... Rivet, 26 ... Recessed space, t-1 ... Width, t-2
...Width, t-3...Width.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of step-shaped foundation frames and a plurality of bridges constructed on each step between the foundation frames arranged in parallel at predetermined intervals in the width direction. The base frame is composed of a board, one or more cross-shaped connecting members installed at the rear, and one or more connecting plates installed at the lower front, and the base frame has two parallel connecting plates.
Between the long vertical bars of a book, one or more short vertical bars arranged in parallel with these long vertical bars, or a plurality of short vertical bars that are gradually lowered in the parallel direction, and the upper part of each vertical bar facing each other. It is formed from an upper crosspiece that is horizontally hung on each side, and a lower crosspiece that is interposed between the lower parts of each of these vertical crosspieces, and among these, the long vertical crosspiece has fixing nuts arranged above and below that extend in the width direction. Two rows of fixing nuts are arranged in parallel, and two fixing nuts arranged at the bottom of the short vertical crosspiece are arranged in parallel in the width direction, and two fixing nuts are arranged in parallel in the width direction on the lower surface of both ends of the spanning board. An L-shaped locking metal fitting whose outer edge is formed along the front and rear surfaces of the vertical crosspiece is installed vertically, and this L-shaped locking metal fitting is located at a distance of less than half the width of the upper crosspiece from the widthwise end surface of the spanning board. a hanging piece that is hung down and formed in contact with the side surface of the upper crosspiece, and a hanging piece that is bent from the tip edge of the hanging piece and formed along the lower surface of the upper crosspiece and has a width of the upper crosspiece. The cross-shaped connecting members are formed from bent pieces whose width is less than half, and the cross-shaped connecting members are pivotally connected to each other at the center, and mounting bolts are screwed to the fixing nuts at each end. The edge of each brace plate is set within half the width of the elongated vertical beam to which the brace plate is attached via mounting bolts, and the connecting plate is An aluminum alloy characterized in that the plate is provided with mounting bolts at both ends thereof, and both edges of the connecting plate are set within half the width of the rectangular vertical beam to which the plate is attached via the mounting bolts. Components of the made chick tier. (2) The spanning board consists of a plurality of unit plates connected in the depth direction, and one of the unit plates has a recessed step on the upper edge and a protrusion on the lower edge on one of both end faces in the depth direction. At the same time, a stepped portion is formed on the upper edge and a protruding piece is formed on the lower edge of the other side, and the protruding piece and the stepped portion on the opposite end faces in the depth direction of the adjacent unit plates are fitted into each other. The structural member of an aluminum alloy chick step according to claim 1, which is a utility model registered claim, in which the fitted projecting piece and the stepped portion are fastened together. (3) The vertical rail has a lower end portion extending below the lower rail, and a recessed space is formed below the lower rail. Components of the aluminum alloy chick stage described.