KR102157683B1 - Lightweight rack frame using different materials - Google Patents

Abstract

The present invention relates to a lightweight rack frame using different materials. More specifically, the present invention relates to the lightweight rack frame using a new type of heterogeneous material, which provides a fitting which can be assembled on site to the overall load of the rack frame and thus improve assembly due to easy handling, and various colors and shapes such as grooves or protrusions can be easily processed to provide various functions as a portion exposed to the outside of the rack frame is formed of aluminum.

Description

Lightweight rack frame using different materials

The present invention relates to a lightweight rack frame using dissimilar materials, and more particularly, an aluminum frame and a steel frame can be used at the same time, and by providing a fitting that can be assembled on-site, the overall load of the rack frame is reduced and handling is easy. This is a lightweight rack frame using a new type of heterogeneous material that can provide various functionalities by improving assembly performance and making it easy to process various colors and shapes such as grooves or protrusions as the part exposed to the outside of the rack frame is formed of aluminum. About.

In general, a rack or enclosure is for installing electrical equipment or electronic equipment, and if the rack or enclosure cannot be entered indoors due to a large size, the rack or enclosure is directly assembled at the installation site.

In the case of direct assembly indoors, the frame is also manufactured by welding, but because welding equipment is required and there is a risk of fire, Korean Utility Model Registration No. 20-0306183 (announced on Mar. 3, 2003) so that the frame can be easily assembled. "Frame connection structure of a cabinet-type rack for storage of communication equipment" has been disclosed.

The frame connection structure of the conventional cabinet-type rack for storage of communication equipment includes a frame consisting of an upper frame and a lower frame assembled into a horizontal frame and a vertical frame, and a vertical frame connecting each corner of the upper frame and the lower frame. In a cabinet-type rack for storage of communication equipment installed at each corner and provided with a connection block connecting the horizontal frame, the vertical frame and the vertical frame, the connection block has each end of the horizontal frame, vertical frame, and vertical frame facing each other. A body portion connecting them in a space, a horizontal fitting portion and a vertical fitting portion formed protruding long from both ends of the body portion and respectively fitted into the interior of the horizontal frame and the vertical frame to be fastened with bolts, and vertical fitting portions in the body portion It is formed to protrude to a long length and is configured to include vertical fittings that are respectively inserted into the interior of the vertical frame and fastened with bolts.

Since the frame connection structure of the conventional cabinet-type rack for storage of communication equipment is manufactured by inserting the horizontal frame and the vertical frame into the connection block, it was possible to easily connect the frame forming the skeleton of the rack without welding.

However, in the frame connection structure of the conventional cabinet-type rack for storage of communication equipment, since the horizontal frame and the vertical frame are both connected to one connection block, each part connected by the load or torsional stress applied to the horizontal or vertical frame is It is easily damaged, and when the connection part is damaged, the replacement cost increases because the connection block must be replaced as a whole, and there is a problem in that replacement is difficult because all the connected parts must be separated to separate the horizontal and vertical frames.

In addition, in the cabinet-type rack frame for storage of communication equipment of the above configuration, the horizontal frame, the vertical frame, and the connecting ports of each frame are all formed of steel, so that the assembled rack frame maintains a solid assembly state. However, it is difficult to transport and assemble materials as the components that make up each frame are formed of high-load steel, and there is a risk of safety accidents due to the fall of the material. It is difficult to form a shape such as a groove or a projection on the frame surface, so only the simple function of forming the outer shape of the rack is possible, and there is a hassle of having to install a separate frame to form the interior of the rack in multiple stages or to install separate members. have.

Registered Patent Publication No. 20-0306183 (Registration date: February 19, 2003) "Frame connection structure of cabinet-type rack for storage of communication equipment" Registered Patent Publication No. 10-1324066 (Registration Date: October 25, 2013) "Rack with warp prevention means and rack assembly using the same"

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to form one rack frame by connecting and assembling a plurality of vertical frames and horizontal frames using a coupling hole, so that each coupling hole can be separated. If a part of the rack frame is damaged because it is formed in a structure that can be repaired in the form of separating the joint of the damaged part and replacing the connected vertical frame and horizontal frame, partial replacement and repair according to the damage can be carried out quickly. It is to provide a lightweight rack frame using a new type of different materials.

Another object of the present invention is to form a vertical frame and a horizontal frame of lightweight aluminum, form a vertical steel frame and a horizontal steel frame having functionality inside the vertical frame and the horizontal frame, and combine each frame into one By forming a rack frame in the form of connecting using a sphere, it is possible to assemble on-site without any additional welding or other work, and as a whole, the rack frame can be reduced in weight, which facilitates handling and improves assembly. In the form of forming grooves or protrusions on the surfaces of vertical steel frames and horizontal steel frames, configurations such as shelves or hangers can be installed inside the rack frame, minimizing the use of separate materials for the installation of shelves, and thus hardening of the rack frame. It is to provide a lightweight rack frame using a new type of heterogeneous material that can be used more efficiently as well as reduction in the internal space of the rack frame.

A lightweight rack frame using dissimilar materials according to an embodiment of the technical idea of the present invention to achieve the above object is a lightweight rack frame using a cabinet-type heterogeneous material for storage of communication equipment, the rack frame (A), the frame (200) and the frame (200) are formed at the corners so that they are connected in a horizontal or vertical direction, and the first horizontal coupling protrusion 113 and the second horizontal coupling protrusion 114 and the first vertical A coupler 100 having a plurality of fastening portions 115 and 126 formed of a coupling protrusion 124 and a second vertical coupling protrusion 125, and the first horizontal coupling protrusion 113 and a first vertical coupling protrusion ( The vertical frame 210 and the horizontal frame 220, which are coupled in the vertical direction and the horizontal direction to 124, and formed of a lightweight material, and the vertical direction to the second horizontal coupling protrusion 114 and the second vertical coupling protrusion 125 It is coupled in the horizontal direction and can be achieved by a lightweight rack frame using a heterogeneous material, characterized in that it includes a vertical steel frame 230 and a horizontal steel frame 240 formed of a steel material.

The coupling hole 100 is a first fastening portion consisting of an inclined groove 111 and a bolt through hole 112 in the central portion and a first coupling protrusion 113 and a second coupling protrusion 114 on both sides in the horizontal direction ( 115) is formed integrally with the horizontal coupling member 110, the horizontal coupling member 110 is assembled, and the inclined protrusion 121 and the nut suppressing groove 122 are formed in communication with the through hole 123 and vertical A vertical coupling member 120 composed of a second fastening portion 126 composed of a first vertical coupling protrusion 124 and a second vertical coupling protrusion 125 in the direction, and a nut for receiving and fixing the nut suppressing groove 121 (140), and through the bolt through hole 122 and through hole 123 to prevent the exposure of the fastening bolt 150 and the nut clamping groove 121, which are screwed with the nut 140, It characterized in that it comprises a cover 130 in which the locking device 131 coupled to the locking groove 127 is formed.

The vertical steel frame 230 and the horizontal steel frame 240 may further include a plurality of fastening grooves 231 in the longitudinal direction on side surfaces of the vertical steel frame 230 and the horizontal steel frame 240.

The vertical frame 210 and the horizontal frame 220 are formed in an arc shape so that the corners of the rack frame (A) are rounded, and the vertical steel frame 230 and the horizontal steel frame 240 are formed in a rectangular shape. It is formed and characterized in that the inner bracket 400 is assembled in a close contact state.

One surface of the vertical steel frame 230 or the horizontal steel frame 240 that further includes locking projections 114a and 125a on one surface of the second horizontal coupling protrusion 114 and the second vertical coupling protrusion 125 It further includes a fixed length hole (232, 242),

Here, in the process of fitting the vertical steel frame 230 or the horizontal steel frame 240 into the second horizontal coupling protrusion 114 and the second vertical coupling protrusion 125, the fixing holes ( It is characterized in that the vertical steel frame 230 or the horizontal steel frame 240 is fixed by being assembled in a form in which 232 and 242 are forcibly fitted.

Lightweight rack frame using dissimilar materials according to the present invention is a steel with functional grooves or protrusions formed inside the vertical frame and horizontal frame while reducing the load of the overall rack frame by forming a vertical frame and a horizontal frame with a lightweight material such as aluminum. By forming a horizontal steel frame and a vertical steel frame made of material, the overall shape of the rack frame can be firmly maintained, and even if high-load electronic equipment or electric equipment is installed inside, it has the effect of maintaining the installed state firmly.

In addition, by forming a functional configuration such as grooves or protrusions on the surfaces of the horizontal steel frame and the vertical steel frame, it is easy to install shelves or hangers inside the rack frame, and it is not necessary to install a separate frame for the installation of the shelves. There is an effect of reducing the overall weight of the frame.

In addition, the vertical frame and the horizontal frame and the horizontal steel frame and the vertical steel frame are connected and assembled at the end by one coupling hole, so that even if a torsional stress acts by a load or an external force, the torsional stress between the horizontal frame and the vertical frame Damage can be minimized, and in particular, even if any one of each frame or coupling is damaged, only the damaged parts can be replaced, thereby significantly reducing the maintenance cost of the rack.

In addition, the horizontal coupling member and the vertical coupling member are coupled by the inclined protrusion and the inclined groove to increase the contact area to strengthen the support, and even if the inclined protrusion is coupled to the inclined groove, the horizontal coupling member It can be combined by exactly matching the vertical coupling member.

In addition, the horizontal coupling member is mounted on the horizontal coupling member seating portion protruding forward to the vertical coupling member to prevent sagging due to the load, thereby strengthening the supporting force, and at the same time, the vertical coupling member and the horizontal coupling member It has the effect of reducing the fatigue of fastening bolts for fastening.

1 is a perspective view of a rack using a lightweight rack frame using different materials according to a first embodiment of the present invention
FIG. 2 is an exploded perspective view of a frame and a fitting of a lightweight rack frame using different materials according to the first embodiment of the present invention.
3 is a perspective view of a vertical or horizontal frame and a vertical or horizontal steel frame among lightweight rack frames using different materials according to the first embodiment of the present invention.
Figure 4 is a perspective view of a coupling hole in a lightweight rack frame using different materials according to the first embodiment of the present invention
5 is an exploded perspective view of a coupling part among a lightweight rack frame using a different material according to the first embodiment of the present invention
6 is an exploded perspective view of another angle of a coupling hole among a lightweight rack frame using a different material according to the first embodiment of the present invention
7 is a cross-sectional view of a combined state of a coupling part among a lightweight rack frame using a different material according to the first embodiment of the present invention
8 is a side view showing a connection form between a coupling hole and a frame among a lightweight rack frame using different materials according to the first embodiment of the present invention.
9 is an exploded perspective view of a coupling hole and a cover among a lightweight rack frame using different materials according to the first embodiment of the present invention
10 is a partially enlarged perspective view of a lightweight rack frame using dissimilar materials according to the first embodiment of the present invention

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, since the embodiments can be modified in various ways and have various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical idea. In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only those effects, the scope of the present invention should not be understood as being limited thereto.

Meanwhile, the meanings of terms described in the present invention should be understood as follows.

Terms such as "first" and "second" are used to distinguish one component from other components, and the scope of rights is not limited by these terms. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

When a component is referred to as being "connected" to another component, it should be understood that although it may be directly connected to the other component, another component may exist in the middle. On the other hand, when it is mentioned that a component is "directly connected" to another component, it should be understood that there is no other component in the middle. On the other hand, other expressions describing the relationship between the constituent elements, that is, "between" and "just between" or "neighboring to" and "directly neighboring to" should be interpreted as well.

Singular expressions are to be understood as including plural expressions unless the context clearly indicates otherwise, and terms such as "comprises" or "have" refer to specified features, numbers, steps, actions, components, parts, or It is to be understood that it is intended to designate that a combination exists, and does not preclude the presence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the field to which the present invention belongs, unless otherwise defined. Terms defined in a commonly used dictionary should be interpreted as having the meaning of the related technology in context, and cannot be interpreted as having an ideal or excessively formal meaning unless explicitly defined in the present invention.

Now, a lightweight rack frame using a different material according to the first embodiment of the present invention will be described in detail with reference to the drawings.

In the accompanying drawings, FIG. 1 is a perspective view of a rack using a lightweight rack frame using a different material according to a first embodiment of the present invention, and FIG. 2 is a perspective view of a rack using a different material according to the first embodiment of the present invention. It is an exploded perspective view of a frame and a fitting, and FIG. 3 is a perspective view of a vertical or horizontal frame and a vertical or horizontal steel frame among lightweight rack frames using different materials according to the first embodiment of the present invention, and FIG. 4 is a first of the present invention. Fig. 5 is an exploded perspective view of a coupling unit among a lightweight rack frame using a different material according to an embodiment, and Fig. 6 is a perspective view of a coupling unit among a lightweight rack frame using a different material according to the first embodiment of the present invention. It is an exploded perspective view of another angle of the coupling part among the lightweight rack frame using different materials according to the first embodiment, and FIG. 7 is a cross-sectional view showing the combined state of the coupling part among the lightweight rack frame using different materials according to the first embodiment of the present invention. , FIG. 8 is a side view showing a connection type between a connector and a frame among a lightweight rack frame using a different material according to the first embodiment of the present invention, and FIG. 9 is a lightweight rack using different materials according to the first embodiment of the present invention. It is an exploded perspective view of the coupling hole and the cover among the frames, and FIG. 10 is a partially enlarged perspective view of a lightweight rack frame using different materials according to the first embodiment of the present invention.

As shown, the lightweight rack frame (A) using different materials according to the present invention has a housing shape and a door 310 is installed on one side in a state where the outside is sealed by a plurality of finish plates 300, It is made in a form in which the administrator can access while various electric equipment or communication equipment is accommodated.

In addition, the rack frame (A) is a frame 200 that connects a plurality of coupling holes 100 formed at a corner portion and a coupling hole 100 adjacent to the coupling hole 100 in a horizontal or vertical direction. Is composed.

The coupling hole 100 is a first fastening portion consisting of an inclined groove 111 and a bolt through hole 112 in the central portion and a first coupling protrusion 113 and a second coupling protrusion 114 on both sides in the horizontal direction ( 115) is formed integrally with the horizontal coupling member 110, the horizontal coupling member 110 is assembled, and the inclined protrusion 121 and the nut suppressing groove 122 are formed in communication with the through hole 123 and vertical A vertical coupling member 120 composed of a second fastening portion 126 composed of a first vertical coupling protrusion 124 and a second vertical coupling protrusion 125 in the direction, and a nut for receiving and fixing the nut suppressing groove 121 (140), and through the bolt through hole 122 and through hole 123 to prevent the exposure of the fastening bolt 150 and the nut clamping groove 121, which are screwed with the nut 140, It is configured to include a cover 130 in which the locking device 131 coupled to the locking groove 127 is formed.

In addition, by forming locking projections 114a and 125a on one surface of the second horizontal engaging projection 114 and the second vertical engaging projection 125, the second horizontal engaging projection 114 and the second vertical engaging projection ( 125) so that the vertical steel frame 230 and the horizontal steel frame 240 are firmly coupled in a force-fitting form.

In addition, a horizontal coupling member seating portion 129 protruding forward is formed at the central portion of the vertical coupling member 120 so that the horizontal coupling member 110 coupled to the vertical coupling member 120 is coupled to the load By this, it is possible to reduce sagging or fatigue of the fastening bolt 150 for fastening the vertical coupling member 120 and the horizontal coupling member 110.

In addition, in the vertical coupling member 120 and the horizontal coupling member 110, the inclined protrusion 121 of the vertical coupling member 120 and the inclined groove 111 of the horizontal coupling member 110 are in close contact with each other, so that the bolt through hole ( 112) and the through hole 123 are positioned on the same line, and the fastening bolt 150 inserted through the bolt through hole 112 is located in the nut suppressing groove 121 in communication with the through hole 123. Screw fastened to the nut 140 has a form in which the vertical coupling member 120 and the horizontal coupling member 110 are coupled.

In this case, even if the vertex of the inclined protrusion 121 is positioned so as to deviate from the inclined groove 111 in the process of the vertical coupling member 120 and the horizontal coupling member 110 in close contact with each other, if the fastening bolt 150 is fastened, the inclined protrusion As 121 is guided to the inclined groove 111, the inclined protrusion 121 is inserted so as to accurately match the center of the inclined groove 111, so that the vertical coupling member 120 and the horizontal coupling member 110 can be firmly fixed. .

In addition, between the inclined protrusions 121 and the inclined grooves 111 that are in close contact with each other, the fastening bolts 150 are tightened in a state in which a rubber or silicone packing (not shown) that can be deformed in shape is inserted to make it more robust. This can be done to prevent natural loosening.

In addition, in a state in which the ends of the vertical or horizontal steel frames 230 and 240 are fitted and coupled to the second horizontal coupling protrusion 114 and the second vertical coupling protrusion 125, auxiliary coupling using a fastening member such as a piece You can also keep it solid.

In addition, stepped portions 116 and 128 are formed at a portion to which the first fastening portion 115 of the horizontal coupling member 110 is connected and a portion to which the second fastening portion 126 of the vertical coupling member 120 is connected. Thus, when the frame 200 is subsequently coupled, the connection portion can be made in a smooth state without protruding to the outside.

The frame 200 is assembled in the vertical direction of the rack frame (A) and has a vertical frame 210 made of a lightweight material such as aluminum that is positioned outside and exposed to the outside, and has the same or similar shape and material as the vertical frame. And the horizontal frame 220 assembled in the horizontal direction of the rack frame (A), and the vertical frame 210 and the horizontal frame 220 inside the vertical frame 210 and the horizontal frame 220 are wrapped outside the The same as the vertical steel frame 230 and the vertical steel frame 230 in which the plurality of fastening grooves 231 and 241 and the upper part are opened in the longitudinal direction to form a fixing hole 232 and 242. To a horizontal steel frame 240 formed of a similar shape and material.

In addition, the vertical frame 210 and the horizontal frame 220 are rounded to the externally exposed portion in a roughly "a" shape to form a curved edge of the rack frame, so that it has excellent aesthetics and is safe from collisions with corners. You can prevent accidents, etc.

In this way, by forming the vertical frame 210 and the horizontal frame 220 with a lightweight material such as aluminum, the overall load of the rack frame can be reduced, and at the same time, it can be molded into various shapes, thereby providing various functional shapes. There are features.

The vertical steel frame 230 and the horizontal steel frame 240 have an approximately "c" shape in cross section, and have a plurality of fastening grooves 231 and 241 in the longitudinal direction and a fixing hole 232 and 242 at the top. Is formed.

The vertical steel frame 230 and the horizontal steel frame 240 as described above are formed on the inside of the vertical frame 210 and horizontal frame 220 formed of a lightweight material to firmly support the overall shape of the rack frame (A). At the same time, it is possible to easily install various internal brackets 400, such as a bracket for installing a shelf or a hinge of a door, in the interior of the rack frame by using a plurality of fastening grooves 231 and 241 formed on the surface.

That is, by fixing the inner bracket 400 directly to the fastening grooves 231, 241 formed in the vertical steel frame 230 and the horizontal steel frame 240, a shelf or a hanger installed inside the rack frame A is installed. In this case, a separate support means for the installation of the shelf is not required, and the parts required for manufacturing the rack frame can be reduced by installing it directly in the fastening grooves (231, 241), which substantially reduces the manufacturing cost required for manufacturing the rack. There are features that can be done.

As described above, the lightweight rack frame (A) using dissimilar materials according to the present invention comprises a vertical frame and a horizontal frame made of a lightweight material such as aluminum to reduce the overall load of the rack frame and to the inside of the vertical frame and the horizontal frame. By forming a horizontal steel frame made of steel with functional grooves or protrusions and a vertical steel frame, the overall shape of the rack frame can be firmly maintained, and even if high-load electronic equipment or electrical equipment is installed inside, the installed state is maintained firmly. It is easy to install shelves or hangers inside the rack frame by forming a functional configuration such as grooves or protrusions on the surfaces of the horizontal steel frame and vertical steel frame, and a separate frame for installation of the shelf. Since installation is not required, the overall rack frame can be reduced in weight.

Moreover, the vertical frame and the horizontal frame and the horizontal steel frame and the vertical steel frame are connected and assembled at the end by one coupling hole, so that even if a torsional stress acts by a load or an external force, the torsional stress between the horizontal frame and the vertical frame Damage can be minimized, and in particular, even if any one of each frame or fitting is damaged, only the damaged parts can be replaced, and thus the maintenance cost of the rack can be significantly reduced.

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been used herein, these are only used for the purpose of describing the present invention, and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical scope of the present invention should be determined by the technical spirit of the appended claims.

100: coupling
110: horizontal coupling member 111: inclined groove
112: bolt through hole 113: first horizontal coupling protrusion
114: second horizontal coupling protrusion 115: first coupling portion
116: stepped 120: vertical coupling member
121: inclined protrusion 122: nut clamping groove
123: through hole 124: first vertical coupling protrusion
125: second vertical coupling protrusion 126: second fastening portion
127: locking groove 128: stepped
130: cover 131: jammer
140: nut 150: fastening bolt
200: frame
210: vertical frame 220: horizontal frame
230: vertical steel frame 231: fastening groove
232: fixed length 240: horizontal steel frame
241: fastening groove 242: fixed length
300: finishing plate 400: inner bracket

Claims (5)

In the lightweight rack frame using cabinet-type heterogeneous materials for storage of communication equipment,
Rack frame (A),
The frame 200 and the frame 200 are formed at the corners to be connected in a horizontal or vertical direction, and the first horizontal coupling protrusion 113 and the second horizontal coupling protrusion 114 and the first A coupler 100 formed with a plurality of fastening portions 115 and 126 composed of a vertical coupling protrusion 124 and a second vertical coupling protrusion 125;
A vertical frame 210 and a horizontal frame 220 coupled to the first horizontal coupling protrusion 113 and the first vertical coupling protrusion 124 in vertical and horizontal directions and formed of a lightweight material;
Including; a vertical steel frame 230 and a horizontal steel frame 240 coupled to the second horizontal coupling protrusion 114 and the second vertical coupling projection 125 in a vertical direction and a horizontal direction and formed of a steel material,
The coupling unit 100,
The first fastening part 115 composed of the inclined groove 111 and the bolt through hole 112 in the center and the first coupling protrusion 113 and the second coupling protrusion 114 on both sides in the horizontal direction is formed integrally horizontally The coupling member 110 and the horizontal coupling member 110 are assembled, and the inclined protrusion 121 and the nut suppressing groove 122 are formed in the central portion to communicate with the through hole 123, and the locking groove 127 and the front A vertical coupling member consisting of a second fastening portion 126 consisting of a first vertical coupling protrusion 124 and a second vertical coupling protrusion 125 in a vertical direction at the bottom of the horizontal coupling member seating portion 129 protruding into the formed (120), a nut 140 to be received and fixed in the nut suppressing groove 122, and a fastening bolt 150 which is screwed with the nut 140 through the bolt through hole 112 and through hole 123 ) And a cover 130 in which a locking device 131 coupled to the locking groove 127 is formed to prevent exposure of the nut suppressing groove 122.
delete The method of claim 1,
A lightweight rack frame using a different material, characterized in that it further comprises a plurality of fastening grooves 231 in the longitudinal direction on the side surfaces of the vertical steel frame 230 and the horizontal steel frame 240.
The method of claim 1,
The vertical frame 210 and the horizontal frame 220 are formed in an arc shape so that the corners of the rack frame (A) are rounded, and the vertical steel frame 230 and the horizontal steel frame 240 are formed in a rectangular shape. Lightweight rack frame using heterogeneous materials, characterized in that the inner bracket 400 is assembled in a close contact state.
The method of claim 1,
One surface of the vertical steel frame 230 or the horizontal steel frame 240 that further includes locking projections 114a and 125a on one surface of the second horizontal coupling protrusion 114 and the second vertical coupling protrusion 125 It further includes a fixed length hole (232, 242),
Here, in the process of fitting the vertical steel frame 230 or the horizontal steel frame 240 into the second horizontal coupling protrusion 114 and the second vertical coupling protrusion 125, the fixing holes ( Lightweight rack frame using different materials, characterized in that the vertical steel frame 230 or the horizontal steel frame 240 is fixed by being assembled in a form in which 232 and 242 are forcibly fitted.

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