JPH06156499A - Nested box type rack - Google Patents

Abstract

PURPOSE:To provide a nested box type rack whose housing efficiency at a time of being out of use is high, and whose stability at a time of being used in piles is prominent. CONSTITUTION:The rack of nested box type can be piled on when it is used, and also put in another of the same constitution when it is not used. In this rack, column members 11-1 and 11-2 are made of a LAMBDA-shaped steel in the cross section, an upper rail 16 is made of a triangle steel whose top angle is 90 deg. and whose two sides sandwiching the top angle are equal, and a lower rail 12 is made of a triangle steel whose top angle is 60 to 80 deg. and whose two sides sandwiching the top angle are equal. Thus, as the column members are shaped in the letter LAMBDA, a nesting efficiency is very high. Further, as the lower rail is shaped in a triangle whose top angle is 60 to 80 deg. and whose two sides sandwiching the top angle are equal, a stability at a time when it is used in piles is prominent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a so-called nesting type rack which can be used by stacking vertically when storing articles and can be housed inside another rack of the same structure when not in use. In particular, the present invention relates to a rack having a high nesting efficiency and excellent stability when stacked vertically.

[0002]

2. Description of the Related Art The rationalization of storage and transportation of goods is a major issue in all industries. In particular, in order to cope with the recent increase in land prices and the increase in transportation costs, it is essential to save space for product storage and improve transportation efficiency. Nesting as proposed in Japanese Patent Publication No. 52-48554 and Japanese Utility Model Publication No. 61-6816 responds to such a request.
It is a formula rack.

FIG. 8 is a view showing a basic form of a conventional nesting rack, (a) is a perspective view, and (b) is a plan view showing only an upper structure. As shown in the figure, the nesting rack has four pillars 11-1 and 11-2 at the four corners, and the upper part is a horizontal beam 15 that connects the rear pillars, and upper and lower rails 16 that connect the front and rear pillars. It is configured. The upper rail 16 is equilateral angle steel having the same shape as the lower rail 12. The distance between the two pillars 11-1 located at the rear of the four pillars (outer method W ₁ ) is smaller than the distance between the left and right rails 16 (inner method W ₂ ).

At the bottom of the rack, there is a bottom frame composed of a horizontal beam 13 and a vertical beam 14 and a crosspiece 17 extending between these beams, and articles to be stored are stacked on the bottom frame. A lower rail 12 of equilateral angle steel is attached to a vertical beam 14 of the bottom frame with a connecting member 19. The connecting members 19 are vertical beams 14 and lower rails 12.
It also serves as a spacer for forming a space 20 into which the forklift claw is inserted. Reference numeral 18 is a reinforcing member that ensures the connection between the pillar 11-2 and the horizontal beam 13 of the bottom frame.

When the above racks are used, racks having the same structure can be stacked vertically, and when stacked, the upper rail 16 of the lower rack fits with the lower rail 12 of the upper rack and is stabilized. To do.

As mentioned above, the rear two columns 11-1 of the rack
Since the space between is narrower than the space between the left and right rails,
When not in use, a second rack of the same shape can be inserted into the first rack, a third rack can be inserted into the second rack, and so on, and stored in a small space. . The rack having such a structure is called a nesting rack, and the above storage is called nesting.

Nested racks are excellent in stability when stacked and used for product storage in factories and warehouses, and when not in use, they can be compactly stored (nested) for storage and transportation, so they are versatile. Has been prized in. However, the pillars 11-1 and 11-2 of the conventional telescopic rack shown in FIG.
Was usually composed of a square tube from the viewpoint of securing strength. Therefore, even if the nesting is performed when not in use, only the thickness of the column will be projected forward. The state is shown in FIG. 7 (a). One side as a pillar is 50
When a square tube of mm is used, nesting 8 racks will result in 50 (mm) × 7 = 350 (m when compared with the case of one rack.
m), the front space is required.

The present inventor previously proposed a newly developed rack in which a column is formed of a section steel having a lambda (Λ) type cross section in order to reduce the forward protrusion of the rack during the nesting. Japanese Patent Application No. 4-137280). As will be described later in detail, the nesting efficiency of the telescopic rack is greatly improved by using the lambda section steel for the column.

[0009]

As described above, the problem of nesting efficiency of nestable racks (saving of storage space) has been solved by the inventor's previous proposal. The present invention has been made for the purpose of further improving the stability during use (during stacking) in this rack having excellent nesting properties.

[0010]

SUMMARY OF THE INVENTION The present invention is a "nested rack that can be stacked vertically when in use, and can accommodate racks of the same structure inside when not in use. Lambda (Λ) shaped steel (hereinafter referred to as "Λ shaped steel"), the upper rail is an equilateral angle steel with a vertical angle of 90 degrees, and the lower rail is an equilateral angle steel with a vertical angle of 60 to 80 degrees. "Nesting rack characterized by".

Here, the term Λ-shaped steel is used by the present inventor in Japanese Patent Application No.
It relates to the invention for which a patent application was filed as No. -137280,
As shown in, the section steel has a Λ (lambda) cross section. The characteristics of this Λ shaped steel are in the following items.

The angle (2θ) formed by the two sides 1 and 35 is 35 ° to
It is 60 °.

A straight portion 2 perpendicular to the axis of symmetry (Z) of the two sides is provided outside the connecting portion (throat) of each side 1, 1.

The ratio (H / H ₁ ) of the height H from the open end of the two sides to this straight line portion to the height H ₁ from the open end to the intersection of the extension lines of the outer straight lines of the two sides is 0.5 to It is 0.9.

A bulge 3 is provided outside the open end of each side 1, 1.

The equilateral angle steel having an apex angle of 90 degrees is a normal equilateral angle steel having a sectional shape shown as "upper rail" in FIGS. 5 and 6 (b). In addition, equilateral angle steel with an apex angle of 60 to 80 degrees is the cross-sectional shape shown in Fig. 5 (a), and the apex angle α is 60 to 80 degrees.
Is an equilateral angle steel.

[0017]

FIG. 1 is a perspective view showing an example of a nestable rack (hereinafter sometimes simply referred to as "rack") of the present invention, FIG. 2 is a plan view of the upper structure of the rack of FIG. 1, and FIG. [Fig. 3] is a plan view of the bottom structure. In the racks of FIGS. 1 and 2, the same members as those of the rack of FIG. 8 are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 2, the distance between the rear columns 11-1 (outer dimension W ₁ ) is smaller than the distance W ₂ between the left and right rails 16, and the front columns 11-2 are outside the rails 16. It is in. Therefore, if racks of the same structure are inserted in the direction of the arrow, nesting can be performed between the left and right front columns and the rails. The basic structure itself is no different from a normal nested rack. The feature of the rack of the present invention is the cross-sectional shape of the front and rear pillars and the members forming the lower rail.

The rear pillar 11-1 and the front pillar 11-2 of the rack of the present invention
Is composed of the Λ-shaped steel described above. Upper rail 16 and lower rail 12
Is an equilateral angle steel, the former having a normal apex angle of 90 degrees and the latter having an apex angle of 60 to 80 degrees.

First, description will be made on making the column a Λ-shaped steel.

The Λ-shaped steel shown in FIG. 4 corresponds to the above-mentioned Japanese Patent Application No. 4-13.
As detailed in the specification of No. 7280, the difference between the maximum value and the minimum value of the secondary radius of the cross section is small, and the occupied cross sectional area is close to that of an equilateral square tube. It is also convenient for stacking and storing, or bundling for transportation and cutting. Moreover, it is inexpensive because it can be manufactured by hot rolling.

When the above-mentioned Λ-shaped steel is used as the pillar material of the nesting rack, the nesting effect of the pillar itself during nesting when the rack is not used reduces the protrusion to the front and saves the storage space. It will be possible. Fig. 7 is a diagram for explaining the effect, which is a rectangular tube of almost the same strength [(a)
Figure] and Λ-shaped steel [(b) Figure] comparing the distances (h ₁ and h ₂ ) approaching to the front, focusing only on the pillars when nesting 8 racks using pillar materials Is. When the column is Λ-shaped steel, h ₂ is about 1 / th compared to h ₁ when the column is square tube.
It is as small as 5.

Next, the upper and lower rails 12, 16 will be described.

The upper and lower rails serve as a guide for stacking racks vertically and have a greater role of ensuring the stability of the racks in use, rather than their role as strength members. As a material for these rails, conventional equilateral angle steel (which is commonly called an angle with a vertical angle of 90 degrees)
However, it has been proposed in Japanese Utility Model Publication No. 61-6816 that the apex angle of the lower rail be made more acute than that of the upper rail to further improve the stability when stacking in a rack. . Although no specific numerical value of the apex angle is described in this publication, in reality, the apex angle of a normal apex is used as the upper rail.
A product using 90-degree equilateral angle steel and a lower rail made of equilateral angle steel with an apex angle of 82 degrees as shown in Fig. 6 (a) has been put into practical use. Hereinafter, this is referred to as a conventional rack. Figure 6
(B) is a diagram showing the fitting state of the upper and lower rails when the conventional racks are stacked, and the lower rail is indicated as (a).
It is equilateral angle steel with a vertical angle of 82 ° in the figure.

FIG. 5 (a) is a sectional view showing an equilateral angle steel used as the lower rail of the rack of the present invention having an apex angle α of 60 to 80 degrees. The same (b) is a diagram showing the fitted state of the upper and lower rails when the racks of the present invention are stacked. The lower rail is an equilateral angle steel with an apex angle of 60 to 80 ° in (a).
When the racks are stacked, the upper rail of the rack located below is the lower rail, and the lower rail of the rack located above is the upper rail. FIG. 5B and FIG. 6B show that state.

As shown in FIG. 6B, even in the conventional rack, the vertical angle (82 degrees) of the lower rail is 90 ° (90 °) of the upper rail.
Since it is an acute angle, the lower rail acts as a cushion and stabilizes due to the load of the rack located above. However, the inner bent portion of the lower rail interferes with the outer apex of the upper rail, and the stability when stacked is not always sufficient. This interference is even greater as the load on the upper racks increases and the lower rails open (the apex angle increases) and sink.

When the equilateral angle steel of FIG. 5 (a) with a small apex angle α is used as the lower rail, as shown in FIG. 5 (b), the equilateral angle steel of the upper rail (with an apex angle of 90 degrees is used. The above interference with) does not occur. Further, the cushion effect of receiving the load of the rack placed above is large, and the stability at the time of stacking is also excellent. Further, as is clear from the comparison between FIG. 5 and FIG. 6 (a), when the heights h are made equal, the side length (L) is shorter in FIG. The weight per unit length is reduced, which contributes to the weight reduction of the entire rack.

In the equilateral angle steel shown in FIG. 5A, the top T is chamfered, but this chamfering is not essential. However, if chamfering is performed so that at least the outer curvature of the bent portion is larger than that of the inner portion, the weight of the equilateral angle steel will be further reduced, and in (c) of FIG. 5 and a partially enlarged view of FIG. As shown in (d), when a large number of chevron steels are stacked, the edges are in close contact with each other and can be tightly bound, which is suitable for storage, transportation and cutting work in a bound state. On the other hand, (c) and (d) of FIG. 6 show the stacking state of the conventional equilateral angle steel with an apex angle of 82 degrees. In this case,
Due to the mutual interference of the tops (bent parts), a gap is created between the sides, and it is not possible to tightly stack the pieces. When cutting a large number of bundled pieces, the band saw becomes chattered, which makes accurate cutting difficult.

In the present invention, the apex angle (α) of the equilateral angle steel used as the lower rail is set to 60 to 80 degrees because the guideability is impaired when the angle is less than 60 degrees, and the position at the time of stacking racks is reduced. This is because it becomes a little difficult to match. on the other hand,
If the apex angle is larger than 80 degrees, the above effect cannot be obtained.
In practical use, the desired apex angle is around 75 degrees.

[0030]

INDUSTRIAL APPLICABILITY The nesting rack of the present invention has a high nesting efficiency due to the pillar material being Λ-shaped steel, and is used when stacked and used due to the lower rail being equilateral angle steel having an apex angle of 60 to 80 degrees. It has excellent stability and can be made lighter than conventional racks. This nested rack greatly contributes to the rationalization of storage and transportation of products and the like, and also contributes to the improvement of the efficiency of storage and transportation of the rack itself.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a telescopic rack of the present invention.

2 is a plan view showing the upper structure of the telescopic rack of FIG. 1. FIG.

FIG. 3 is a plan view showing a bottom structure of the same.

FIG. 4 is a cross-sectional view of a lambda shaped steel used as a pillar material of the nesting rack of the present invention.

FIG. 5 (a) is a cross-sectional view of an equilateral angle steel with an apex angle α of 60 to 80 degrees used as the lower rail of the nesting rack of the present invention, (b).
Is a diagram showing the mating state of the lower rail and the upper rail, (c) is (a)
FIG. 3 is a diagram showing a stacking state of equilateral angle steel, and (d) is a partially enlarged view thereof.

6 (a) is a cross-sectional view of equilateral angle steel with an apex angle of 82 degrees used in a conventional telescopic rack, and (b) to (c) are (b) to (c) of FIG. ) Is the same figure as.

FIG. 7 is a diagram showing nesting efficiencies of a square tube (a) used as a pillar material of a conventional nesting rack and a lambda section steel (b) used as a pillar material of the rack of the present invention.

FIG. 8A is a perspective view showing the basic shape of a conventional nested rack, and FIG. 8B is a plan view of the upper structure of the rack.

Claims (1)

[Claims] Claims: 1. A nesting rack that can be stacked vertically when in use, and can accommodate racks of the same structure inside when not in use, where the pillar is a lambda shaped section steel and the upper rail is Equilateral angle steel with an apex angle of 90 degrees, the lower rail has an apex angle of 60 ~
Nesting rack characterized by being made of 80-degree equilateral angle steel.