JP5960456B2 - Cabinet bottom plate & cabinet - Google Patents

Description

  The present invention relates to a bottom plate of a cabinet formed by bending a metal plate, and a cabinet provided with this bottom plate, and in particular, by drawing a steel plate into a three-dimensional shape, the overall strength is increased. In addition, the present invention relates to a bottom plate that can reduce the plate thickness, reduce the number of components, and absorb shocks received by casters, and a cabinet including the bottom plate.

  As office furniture and household furniture, cabinets made by bending steel plates are widely known. FIG. 10 is a perspective view showing a conventional cabinet. FIG. 11 is a partial sectional view showing a bottom plate in front of a conventional cabinet.

  In FIG. 10, the cabinet 100 is mainly configured to include a box-shaped main body 110 having two front and bottom openings, and a plurality of drawers 120, 120, 120. As shown in FIG. 11, a pair of front and rear bottom plates 101, 101 are installed on the bottom bent portions 111 a, 111 a of the left and right side plates 111, 111 on the bottom surface of the main body 110.

  The conventional bottom plate 101 has a configuration in which a steel plate having a thickness of 1.2 to 1.6 mm is cut into a predetermined shape, and the steel plate is bent so that the cross-section has a substantially reverse concave shape. Joined portions 101a and 101b with the left and right side plates 111 and 111 were formed on the long sides before and after each bottom plate 101 by bending the steel plate at the corresponding location. These joint portions 101 a and 101 b are spot welded to the lower end bent portions 111 a and 111 a of the left and right side plates 111 and 111, thereby fixing the bottom plates 101 to the front and back of the bottom surface of the cabinet 100.

  At the position shifted from the center of each bottom plate 101, a single stepped portion 101c extending in the longitudinal direction was bent. Casters 130, 130 made of synthetic resin were attached to the left and right ends of the protruding portion 101c, respectively.

Special table 2010-502331 JP 2010-75414 A JP 2000-316651 A Japanese Patent Laid-Open No. 11-128009 JP 9-313275 A JP-A-7-223394 JP-A-7-143919 Japanese Patent Laid-Open No. 6-141942 Japanese Patent No. 3734319 Japanese Patent No. 3175537 Japanese Utility Model Publication No. 6-84940 Japanese Utility Model Publication No. 6-84939 Japanese Utility Model Publication No. 5-80334 Japanese Utility Model Publication No. 5-31643 Japanese Utility Model Publication No. 4-77342 Japanese Utility Model Publication No. 4-48846 Japanese Utility Model Publication No. 3-29029 Japanese Utility Model Publication No. 2-74845 Japanese Utility Model Publication No. 2-74845 Japanese Utility Model Publication No. 2-19332 Japanese Utility Model Publication No. 63-64246 Japanese Utility Model Publication No. 61-177045 Japanese Utility Model Publication No. 61-28441 Japanese Utility Model Publication No. 61-28440 Utility Model Registration No. 3043380

<Increase in weight>
However, the bottom plate 101 of the above-described conventional cabinet 100 uses an extremely thick steel plate having a thickness of 1.2 to 1.6 mm in order to ensure rigidity capable of withstanding a static load and a dynamic load applied via each caster 130. It was. For this reason, there existed a problem that the weight of the whole cabinet 100 became large. In the first place, when forming office furniture and household furniture by bending a steel plate, there is a basic design concept of ensuring the strength of the necessary location by increasing the thickness of the plate. In order to withstand a static load and a dynamic load generated, the conventional bottom plate 101 is formed by bending a steel plate that is about twice as thick as the main body 110 and the drawer 120.

<Difference in sheet thickness>
Here, a relatively thin steel plate having a thickness of 0.7 to 0.8 mm is normally used for the main body 110 and the drawer 120 of the cabinet 100, and each bottom plate 101 having a thickness different from that of the steel plate is used as the main body. There was a problem that it could not be coupled to a steel plate having the same thickness as 110. For this reason, in the conventional cabinet 100, the two bottom plates 101 and 101 must always be provided as separate parts, and there is a problem that the number of parts cannot be reduced.

  Since only the thickness of the bottom plate 101 is different, two types of steel plates for forming the main body 110 and the drawer 120 and a steel plate for forming the bottom plate 101 must be prepared when the cabinet 100 is manufactured. There is a problem that purchasing and managing a plurality of types of materials is complicated. Further, it is difficult to visually confirm a difference in thickness of less than 1 mm, and there is a problem that a steel plate having a different thickness is misused when the thickness is not marked. In particular, the area occupied by the bottom plate 101 of the entire cabinet 100 is small, and it is unreasonable to take the risk of these problems due to a small amount of steel plates having different thicknesses.

<Move cabinet>
Since the bottom plate 101 having a plate thickness of 1.2 to 1.6 mm has extremely high rigidity, the bottom plate 101 hardly elastically deforms due to a dynamic load when the caster 130 receives an impact. For this reason, in the case of the conventional bottom plate 101, when there is a step on the floor surface when the cabinet 100 is moved, it is not possible to absorb the impact when the step is overcome. For this reason, there is a problem that the caster 130 made of resin having a relatively low rigidity is subjected to an impact, cracking parts such as a bearing portion and a roller, and the caster 130 is damaged. Further, when the conventional cabinet 100 is moved, there is a problem that resonance and chatter noise are generated in each part of the main body 110 and the drawer 120, and an unpleasant vibration is transmitted to the hand pressing the cabinet 100.

  For example, free addresses are becoming popular as office styles in recent years, and each employee frequently moves the cabinet 100 with a caster for personal use to an arbitrary shared desk. Moreover, the slide-type cabinet 100 as shown in FIG. 12 is frequently moved in the lateral direction by a pair of casters 130 and 130 provided at the center of the bottom surface. In such a case, in the conventional cabinet 100, since the bottom plate 101 hardly elastically deforms due to a dynamic load during movement, the caster 130 may be damaged due to vibration or impact.

<Object of the present invention>
The present invention has been made in view of the above problems, and by drawing a steel plate into a three-dimensional shape as a whole, the overall strength can be increased and the plate thickness can be reduced. An object of the present invention is to provide a bottom plate that can absorb vibrations and shocks received by casters, and a cabinet equipped with the bottom plate.

(1) In order to achieve the above object, the bottom plate of the cabinet of the present invention is a bottom plate of a cabinet formed by bending a steel plate, and the length corresponds to the width dimension or depth dimension of the cabinet. The steel plate is 0.6 mm to 0.8 mm in length, the substantially central portion of the steel plate is drawn from one side to form a box-shaped recess having a substantially rectangular outline in plan view, and the steel plate At least one of the flange-like peripheral portions not drawn is configured as a fixing portion for fixing to at least one of the left and right side plates of the cabinet.

  According to the above configuration, the steel plate is drawn and the entire bottom plate is formed into a box-shaped three-dimensional shape, thereby giving a thin steel plate having a thickness of 0.6 mm to 0.8 mm sufficient strength as a cabinet bottom plate. be able to. That is, the box-shaped recess formed by drawing has a three-dimensional shape in which all of its constituent elements are seamlessly integrated, so that the entire bottom plate is given high rigidity against a static load. As a result, even if the plate thickness of the steel plate is reduced to 0.6 mm to 0.8 mm, it is equivalent to the bottom plate 101 (see FIG. 11) obtained by bending a conventional plate thickness of 1.2 to 1.6 mm into a square. Can be obtained. As a result, it is possible to reduce the thickness of the bottom plate and reduce the weight of the entire cabinet.

  Further, according to the bottom plate of the present invention, the thickness of the steel plate can be made the same as the thickness of the cabinet body, and the bottom plate of the present invention is coupled to the back plate and the left and right side plates constituting the cabinet body. Thus, the number of parts can be reduced. Furthermore, the thickness of the steel plate used for the manufacture of the cabinet can be unified to one type, the labor of purchasing and managing the materials can be reduced, and the productivity of the product can be improved and the cost can be reduced. .

(2) Preferably, the vertical and horizontal cross-sectional shape of the box-shaped recess is a substantially trapezoidal shape spreading toward one surface side.

  According to such a configuration, by making the box-shaped recess formed by drawing into a substantially trapezoidal cross section, it is possible to give the box-shaped recess an elasticity against a dynamic load while giving the entire bottom plate high rigidity against a static load. it can. That is, by drawing a three-dimensional shape to a thin steel plate, the rigidity against the static load of the entire bottom plate is increased, but the plate thickness of the steel plate is reduced and the box-shaped recess is substantially trapezoidal in cross section. Thus, the plate surface that receives the load of the box-shaped recess surrounded by the inclined surfaces on all sides is easily elastically deformed with respect to the vertical, left, and right dynamic loads. Such elastic deformation of the box-shaped concave portion makes it possible to absorb vibrations and shocks received by the casters, and to prevent the casters from being damaged due to the movement of the cabinet. Further, the vibration absorption effect of the bottom plate during the movement of the cabinet can reduce the movement noise of the cabinet and the unpleasant vibration transmitted to the hand.

(3) Preferably, the fixing portion is drawn from one surface side, and extends in a direction orthogonal to the longitudinal direction of the fixing portion, and a plurality of grooves are formed with one end reaching the box-shaped recess. .

  According to such a configuration, the three-dimensional shape of the concave groove formed by drawing can prevent the fixing portion made of a thin steel plate from bending in the longitudinal direction, and increase the rigidity of the fixing portion itself. Can do. In addition, each concave groove reaches the box-shaped concave portion and becomes a series of three-dimensional shapes with the box-shaped concave portion, so that the rigidity of the boundary portion between the fixed portion and the box-shaped concave portion is increased, and the strength of the entire bottom plate including the fixed portion is increased. It becomes possible to make it higher.

(4) Preferably, as the caster or adjuster attachment part of the cabinet, the box-shaped concave part is drawn from the other surface side to form a convex part protruding into the box-shaped concave part.

  According to the said structure, the rigidity of attachment part itself can be made high by making the attachment part of a caster or an adjuster into the integral three-dimensional shape formed by drawing. Moreover, it becomes possible to distribute the static load from a caster or an adjuster by such an attachment part, and it can prevent the load concentration to the attachment location of a caster or an adjuster.

(5) Preferably, as the caster or adjuster mounting portion of the cabinet, the box-shaped concave portion is drawn from the other surface side to form a pair of circular convex portions projecting at least at both ends of the box-shaped concave portion. In addition, it is preferable that a single ridge extending from one end to the other end of the box-shaped recess is formed through each circular projection.

  According to the said structure, the load from a caster or an adjuster can be uniformly disperse | distributed to an attachment part by making an attachment part into circular convex shape. Further, by connecting the circular convex attachment portions with the ridges formed by drawing, the load received by these attachment portions can be released along the ridges. Furthermore, since the ridge extending from one end of the box-shaped recess to the other end is an integral three-dimensional shape formed by drawing, it acts as a rib that reinforces the plate surface in the box-shaped recess, and the strength of the entire bottom plate Further increase.

(6) In order to achieve the above object, the cabinet of the present invention has a structure including the bottom plate according to any one of the above (1) to (5), and preferably has a thickness of 0.6 mm to A back plate made of a 0.8 mm steel plate may be provided, and the bottom plate having a length corresponding to the width of the cabinet may be coupled to the lower side of the back plate.

  According to the cabinet of the present invention having the above-described configuration, the main body and the drawer of the cabinet and the bottom plate can be manufactured with steel plates having the same thickness, and the cost can be reduced by reducing the thickness of the bottom plate. Moreover, it becomes possible to couple | bond a baseplate with the backplate which comprises the main body of a cabinet, and can aim at reduction of a number of parts and a manufacturing process.

  According to the bottom plate of the present invention, by drawing a steel plate into a three-dimensional shape as a whole, the overall strength can be increased and the plate thickness can be reduced, and vibrations and shocks received by the caster can be absorbed. Is possible. Moreover, according to the cabinet of the present invention provided with such a bottom plate, the cabinet body and drawer and the bottom plate can be manufactured with steel plates having the same thickness, and the cost can be reduced by thinning the bottom plate. The bottom plate can be coupled to the steel plate constituting the main body of the cabinet, and the number of parts and the manufacturing process can be reduced.

The bottom plate which concerns on one Embodiment of this invention is shown, The same figure (a) is a top view, The same figure (b) is AA sectional drawing of the same figure (a), The same figure (c) is the same figure. It is BB sectional drawing of (a). It is a perspective view which shows the cabinet main body provided with the said baseplate. It is the perspective view which looked at the said cabinet main body from the bottom face side. It is sectional drawing of the said cabinet main body. The same figure (a) and (b) is a bottom view of the said cabinet main body, and shows the attachment aspect of the said baseplate. The same figure (a) and (b) is a fragmentary sectional view which shows the impact-absorbing effect | action of the said baseplate. It is a fragmentary sectional view which shows the structure which coupled the back baseplate to the backplate of the cabinet main body. It is a fragmentary sectional view which shows the structure which coupled the front and back bottom board to the back board of the cabinet main body. It is a perspective part which shows the structure which attached the adjuster to the baseplate. It is a perspective view which shows the conventional cabinet. It is a fragmentary sectional view which shows the bottom plate ahead of the conventional cabinet. It is a perspective view which shows the conventional slide-type cabinet.

  Hereinafter, the baseplate and cabinet which concern on one Embodiment of this invention are demonstrated, referring FIGS.

<Configuration of bottom plate>
1A to 1C, the bottom plate 1 of the present embodiment is made of a steel plate having a thickness of 0.6 mm to 0.8 mm, and mainly includes a box-shaped recess 11 and a pair of left and right fixing portions 12 and 12. The reinforcement portions 13 and 14 are provided. The length of the bottom plate 1 of this embodiment corresponds to the width dimension of the cabinet body 2 shown in FIG. 2, and the pair of front and rear bottom plates 1 and 1 are fixed to the front end and the rear end of the cabinet body 2 by spot welding, respectively. To do. At the time of fixing, each bottom plate 1 directs the opening of the box-shaped recess 11 shown in FIG.

<< Box-shaped recess >>
Returning to FIGS. 1A to 1C, the box-shaped recess 11 of the bottom plate 1 is formed by drawing a substantially central portion of the steel plate from one surface side P. By forming the box-shaped recess 11 in a flat steel plate, almost the entire steel plate can be made into a box-shaped three-dimensional shape. Thereby, the rigidity with respect to a static load of the whole baseplate 1 which consists of a thin steel plate with a board thickness of 0.6 mm-0.8 mm can be made high.

  Further, the box-shaped recess 11 of the present embodiment has a substantially rectangular outline in plan view as shown in FIG. 1A, and as shown in FIGS. The cross-sectional shape is substantially isosceles trapezoidal shape spreading toward the one surface side P. Here, although the cross-sectional shape of the box-shaped recess 11 is not particularly limited, the static load is applied to the entire bottom plate 1 by making the cross-sectional shape of the box-shaped recess 11 substantially trapezoidal as in this embodiment. Thus, the box-shaped recess 11 can be given elasticity against a dynamic load. This will be described later with reference to FIGS. 6A and 6B.

<< Mounting part >>
A pair of attachment portions 11b and 11b for attaching casters 30 and 30 as shown in FIG. 3 are formed on the left and right sides of the horizontal plate surface 11a of the box-shaped recess 11. As shown in FIGS. 1B and 1C, each mounting portion 11 b has a convex shape that projects the plate surface 11 a of the box-shaped recess 11 from the other side Q and projects into the box-shaped recess 11. .

  By making each attachment part 11b into an integral three-dimensional shape formed by drawing, the rigidity of the attachment part 11b itself can be increased. Moreover, it becomes possible to disperse the static load from the caster 30 by such an attachment part 11b, and the load concentration to the attachment location of the caster 30 can be prevented.

  Here, the shape of the attachment portion 11b is not particularly limited as long as it is a convex three-dimensional shape having an area for attaching the caster 30, but in the present embodiment, it is shown in FIG. Thus, the outline of each attachment part 11b is made circular. The circular attachment portion 11b can evenly distribute the load from the caster 30 in all directions, and can more effectively prevent local deformation of the plate surface 11a.

<< Projections >>
The plate surface 11a of the box-shaped recess 11 is formed with a single protrusion 11c that passes through the left and right attachment portions 11b and 11b and extends from one end to the other end of the plate surface 11a. As shown in FIGS. 1 (b) and 1 (c), the ridge 11 c has a convex shape that projects into the box-shaped recess 11 by drawing the plate surface 11 a of the box-shaped recess 11 from the other side Q. Such ridges 11c are drawn simultaneously with the mounting portions 11b.

  The ridges 11c extending from one end to the other end of the box-shaped recess 11 have an integral three-dimensional shape formed by drawing, and thus serve as ribs that reinforce the plate surface 11a in the box-shaped recess 11. Further increase the overall strength.

<< Fixed part >>
1 (a) and 1 (b), the fixing portions 12 and 12 of the bottom plate 1 are left and right flange-like peripheral portions that are not drawn, and the left and right side plates 21 and 21 of the cabinet body 2 shown in FIG. It will be a spot welding fee. In the present embodiment, each fixing portion 12 is drawn from one surface side P, and extends in a direction orthogonal to the longitudinal direction of the fixing portion 12, and three grooves 12a, 12a, one end of which reaches the box-shaped recess 11a, 12a is formed.

  These concave grooves 12a, 12a and 12a are also integrally formed in a three-dimensional shape by drawing, and prevent the fixed portion 12 made of a thin steel plate having a thickness of 0.6 mm to 0.8 mm from bending in the longitudinal direction. It acts as a reinforcing rib. Moreover, each concave groove 12a reaches the box-shaped recessed part 11a, and becomes a series of three-dimensional shapes with the box-shaped recessed part 11a, whereby the rigidity of the boundary portion between each fixed part 12 and the box-shaped recessed part 11a is increased. Thereby, it becomes possible to make the intensity | strength of the bottom plate 1 whole containing each fixing | fixed part 12 high.

  Here, the shape of each groove 12a is not particularly limited, but in this embodiment, each groove 12a has a substantially semicircular cross section, and each groove 12a has a three-dimensional shape with higher rigidity. .

<< Reinforcement section >>
1 (a) and 1 (c), the reinforcing portions 13 and 14 of the bottom plate 1 are formed by bending a steel plate in the longitudinal direction, which is not drawn, toward the other side Q shown in FIG. 1 (b). It has become the composition. These reinforcing portions 13 and 14 enhance the rigidity in the longitudinal direction of the bottom plate 1 by their vertical surfaces.

<< Effects of bottom plate >>
According to the bottom plate 1 of the present embodiment described above, the steel plate is drawn, and the entire bottom plate 1 is formed into a box-shaped three-dimensional shape. The bottom plate 1 can have a sufficient strength. This makes it possible to reduce the weight of the entire cabinet.

  Moreover, according to the bottom plate 1 of this embodiment, the plate | board thickness of a steel plate can be made the same as the plate | board thickness of the cabinet main body 2 as shown in FIG. It is possible to reduce the number of parts by coupling the bottom plate 1 of the present embodiment to 21 and 21. Furthermore, the thickness of the steel plate used for the manufacture of the cabinet can be unified to one type, the labor of purchasing and managing the materials can be reduced, and the productivity of the product can be improved and the cost can be reduced. .

<Cabinet configuration>
Next, the cabinet of the present embodiment including the above-described bottom plates 1 and 1 will be described with reference to FIGS. In these drawings, the cabinet according to the present embodiment is characterized by including the bottom plates 1 and 1, so that the explanation and illustration of the drawer are omitted, and the cabinet body 2 including the bottom plates 1 and 1 will be described in detail. .

  As shown in FIG. 2, the cabinet body 2 of the present embodiment is configured to include left and right side plates 21, 21, a top plate 22, and a back plate 23. Of these, the left and right side plates 21 and 21 and the back plate 23 are a series of members formed by bending a single steel plate, and the back plate 23 is spot welded to the rear end opening.

  As shown in FIGS. 2 and 3, a pair of bottom plates 1, 1 are installed at the front and rear ends of the left and right side plates 21, 21 at the bottom opening of the cabinet body 2. Each bottom plate 1 mounts the left and right fixing portions 12 and 12 shown in FIG. 1A on the bent portions provided at the lower ends of the left and right side plates 21 and 21, respectively, and has three concave grooves 12a, 12a and 12a. The two planes between the two are fixed by spot welding to the bent portion (see FIG. 5A).

  As shown in FIGS. 3 and 4, casters 30, 30, 30, 30 made of synthetic resin are fastened to the attachment portions 11 b, 11 b of each bottom plate 1 with bolts and nuts, respectively.

<<< Vibration and shock absorbing effect of bottom plate >>>
According to the bottom plate 1 of the present embodiment, the box-shaped recess 11 formed by drawing is formed into a substantially trapezoidal cross section, so that the entire bottom plate 1 is given high rigidity against a static load and the box-shaped recess 11 is subjected to a dynamic load. Can give elasticity. That is, in this embodiment, the rigidity of the entire bottom plate 1 is increased by drawing the three-dimensional shape, but the thickness of the steel plate 1 is reduced to 0.6 mm to 0.8 mm, And by making the box-shaped recessed part 11 into a substantially trapezoidal cross section, the plate surface that receives the load of the box-shaped recessed part surrounded on the four sides by the inclined surface is easily elastically deformed with respect to the vertical, left, and right dynamic loads. 6 (a) and 6 (b), when the caster 30 gets over the step on the floor surface, the box-shaped recess 11 is elastically deformed by receiving a vertical dynamic load, and the caster 30 is It is possible to absorb the vibrations and shocks received. As a result, it is possible to prevent the caster 30 from being damaged due to the movement of the cabinet. Further, the vibration absorption effect of the bottom plate during the movement of the cabinet can reduce the movement noise of the cabinet and the unpleasant vibration transmitted to the hand.

<Example of change>
The bottom plate and cabinet of the present invention are not limited to the above-described embodiments. For example, in the above-described embodiment, as shown in FIG. 5A, the pair of bottom plates 1 and 1 are respectively constructed on the front and rear ends of the left and right side plates 21 and 21 of the cabinet body 2. It is not limited. As shown in FIG. 2B, the bottom plates 1 and 1 extending from the front end to the rear end may be individually provided at the lower ends of the left and right side plates 21 and 21, respectively.

  Further, as shown in FIG. 7, the thickness of the bottom plate 1 may be the same as the thickness of the back plate 23 of the cabinet body 2, and the rear bottom plate 1 may be coupled to the back plate 23. According to such a configuration, the bottom plate 1 can be coupled to the back plate 23 constituting the cabinet body 2, and the number of parts and the manufacturing process can be reduced.

  Further, as shown in FIG. 8, a steel plate 24 having an area covering the bottom opening of the cabinet body 2 is coupled to the back plate 23 of the cabinet body 2, and a pair of box-shaped recesses 11, 11 are provided on the front and rear sides or the left and right sides of the steel plate. It is good also as a structure which carried out drawing processing.

  In addition, in the above-described embodiment, the configuration in which the casters 30 and 30 are attached to the attachment portions 11b of the bottom plate 1 is illustrated, but the present invention is not limited to this, and as illustrated in FIG. It is good also as a structure which welded the nuts 41 and 41 to each attaching part 11b, respectively, and screwed the adjusters 40 and 40 to these nuts 41 and 41, respectively. Even in such a configuration, it is possible to disperse the static load from each adjuster 40, and it is possible to prevent the load concentration at the mounting location.

DESCRIPTION OF SYMBOLS 1 Bottom plate 11 Box-shaped recessed part 11a Plate surface 11b Mounting part 11c Rib 12 Fixed part 12a Groove 13 and 14 Reinforcement part 2 Cabinet main body 21 Left right side plate 22 Top plate 23 Back plate 24 Steel plate 30 Caster 40 Adjuster

Claims (8)

A bottom plate of a cabinet formed by bending a metal plate,
The length of one length and width corresponds to one of the width dimension or depth dimension of the cabinet, and consists of a pair of steel plates having a thickness of 0.6 mm to 0.8 mm,
A substantially central portion of each steel sheet by drawing from one side of the steel plate, the contour of the plan view is substantially rectangular box-like recess is formed,
At least one of the aperture machined in flange-like rim portion not of the steel sheet, a fixing portion for fixing to at least one of the left and right side plates of the cabinet, the bottom plate of the cabinet, characterized in that. A bottom plate of a cabinet formed by bending a metal plate,
Both vertical and horizontal lengths correspond to both the width and depth dimensions of the cabinet, and consist of a single steel sheet with a thickness of 0.6 mm to 0.8 mm.
In the front and rear portions or the left and right portions of the steel plate, a pair of box-shaped recesses having a substantially rectangular outline in plan view are formed by drawing from one side of the steel plate,
The bottom plate of a cabinet, wherein at least one of the non-drawn peripheral portions of the steel plate serves as a fixing portion for fixing to at least one of the left and right side plates of the cabinet. The bottom plate of the cabinet according to claim 1 or 2 , wherein a vertical and horizontal cross-sectional shape of the box-shaped recess is a substantially trapezoidal shape spreading toward one surface side. Wherein the fixing part, by drawing from one surface of the steel sheet, extending in a direction perpendicular to the longitudinal direction of the fixing part, a plurality of grooves having one end reaching the box-like recess is formed, according to claim 1 The bottom plate of the cabinet of any one of -3. As a mounting portion of the caster or adjuster of the cabinet, the said box-like recess, by drawing from the other surface side of the steel plate, the projecting portion projecting into the box-shaped inner recess is formed, according to claim 1-4 The bottom plate of the cabinet according to any one of the above. As a mounting portion of the caster or adjuster of the cabinet, the said box-like recess, by drawing from the other surface side of the steel sheet, a pair of circular protrusion protruding at least on both end sides of the box-like recess is formed, respectively ,
Through the respective circular protrusion, a single ridge extending from one end of the box-like recess is formed, the bottom plate of the cabinet according to claim 5. A cabinet comprising the bottom plate according to any one of claims 1 to 6 . The cabinet according to claim 7 , comprising a back plate made of a steel plate having a thickness of 0.6 mm to 0.8 mm, and the bottom plate having a length corresponding to the width of the cabinet is coupled to a lower side of the back plate. .

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