- 2 -
[Technical Field]
The present invention relates to a cubicle for inverters, and particularly to a
cubicle for large-capacity inverters which is suitably used for mounting electronic instruments
such as a control device.
5 [Background Art]
One of the known cubicles for housing electronic instruments such as a control
device includes: a pair of frames each formed in a quadrangular shape; a plurality of columns
arranged respectively at comers of each frame for coupling the frames to each other; and comer
members arranged respectively at the comers of each frame for coupling each frame and each
10 column to each other. Techniques relating to the cubicles of this type are described in JP-B23600948
(Patent Literature 1) and JP-A-7-67219 (Patent Literature 2), for example.
According to Patent Literature 1, when each frame, each column, and each comer
member, which have been coated on their surfaces with insulating layers of paint, plating, or the
like, are joined to each other for assembling the cubicle, protrusions and fitting holes are fitted to
15 each other by fastening rivets inserted in fastening-member insertion through-holes. The frame
and the column, the frame and the comer member, and the column and the comer member are
thus joined to each other by deformation resulting from the fitting of the protrusions and the
fitting holes. Patent Literature 1 employs a method of establishing electrical conduction
between the members by utilizing the deformation resulting from the fitting ofthe protrusions
20 and the fitting holes, so that the insulating layers of paint, plating, or the like are removed off the
members. Patent Literature 1 describes a technique using the comer members with rivet
fastening as described above to obtain electrical conduction between the members and to
facilitate the work of positioning the members so that a reduction in production costs can be
achieved due to a reduction in the time for the work of positioning the members.
25 On the other hand, according to Patent Literature 2, a cubicle is manufactured by
bringing reinforcing members for reinforcing a frame ofthe cubicle into contact with combined
portions of frame members, which constitute the frame ofthe cubicle, and fixing the frame
members and the reinforcing members with fixing members, to form a framework of the cubicle.
In this manufacture of the cubicle, through-holes for the fixing members are formed in the
30 reinforcing members to have a size that allows the frame members, the reinforcing members, and
the fixing members to be integrally welded, and then these members are integrally welded.
Patent Literature 2 describes a technique in which, during the manufacture, the frame members
and the reinforcing members are fixed with bolts and the framework ofthe cubicle is assembled
- 3 -
and adjusted in form, and then, the frame members, the reinforcing members, and the bolts are
welded, thereby eliminating creaking and loosening, which are weak points of such a bolt
assembly system.
[Summary of Invention]
5 However, studying the techniques relating to cubicles described in Patent
Literatures 1 and 2 revealed the following problems.
The technique of Patent Literature 1 employs rivets as fastening members used
for coupling each frame, each column, and each comer member. For this reason, this technique
makes a cubicle for large-capacity inverters, which incorporates heavy components, insufficient
10 in strength and impact resistance. Accordingly, the comer members with rivet fastening cannot
be used for the assembling of such cubicle. Further, since the comer members with rivet
fastening cannot be used for a cubicle for large-capacity inverters, the positioning work is
difficult at the time of assembling the cubicle and thus increases the work time, resulting in an
increase in production costs.
15 On the other hand, the technique of Patent Literature 2 employs the bolt assembly
system in which the frame members and the reinforcing members are fixed with bolts and the
framework ofthe cubicle is assembled and adjusted in form. Thus, this technique is not one
using comer members with rivet fastening, which is advantageous in terms of the positioning
work in the assembling ofthe cubicle.
20 The present invention has been made in view ofthe above-described problems.
An exemplary object of the present invention is to provide a cubicle for large-capacity inverters
which is capable of easily performing the positioning ofmembers relative to each other and
reducing the time for assembling work and which is capable of achieving sufficient strength and
impact resistance.
25 The above-described and other objects and novel features of the present invention
will be made clear from the description ofthe Specification and the accompanying drawings.
A summary of an exemplary embodiment ofthe invention disclosed in the present
application will be briefly described below.
Specifically, an exemplary cubicle for large-capacity inverters comprises: a pair
30 of frames including an upper frame and a lower frame each formed of a plurality of beams
arranged in a polygonal shape; a plurality of columns arranged respectively at comers of the pair
of frames for coupling the pair of frames to each other; and a plurality of comer members
arranged respectively at the comers of each ofthe pair of frames and each having a contact
surface which comes into contact with a corresponding one of the pair of frames and a contact
- 4 -
surface which comes into contact with a corresponding one ofthe plurality of columns.
In addition, fastening-member insertion through-holes are formed in the contact
surfaces of the plurality ofcomer members as well as in facing surfaces where the upper frame
or the lower frame ofthe pair of frames and axial end portions ofthe plurality of columns face
5 each other, the upper frame or the lower frame and the plurality of columns are joined to each
other via the plurality of comer members by fastening fastening members inserted in the
fastening-member insertion through-holes, the plurality of comer members, the upper frame or
the lower frame, and the plurality of columns are joined to each other by welding, the comer
members are joined by using the fastening members and the welding in combination, and the
10 fastening members are rivets.
Advantageous effects of an exemplary embodiment of the invention disclosed in
the present application will be briefly described below.
Specifically, exemplary advantageous effects are that the joining of the comer
members using the fastening members and the welding in combination enables to easily perform
15 the positioning ofmembers relative to each other and to reduce the time for assembling work,
and also enables to achieve sufficient strength and impact resistance for a cubicle for largecapacity
inverters, which incorporates heavy components.
[Brief Description of Drawings]
FIG 1 is a perspective view showing an example of the entire structure of a
20 cubicle for large-capacity inverters according to an embodiment ofthe present invention.
FIG 2 is an exploded perspective view showing in detail a coupling portion of the
cubicle for large-capacity inverters shown in FIG 1.
FIG 3 is an inner-side perspective view showing in detail a joint portion by
welding combined with rivet fastening at a coupling portion of the cubicle for large-capacity
25 inverters shown in FIG 1.
FIG 4 a schematic circuit diagram showing an example of a circuit configuration
of a large-capacity inverter mounted in the cubicle for large-capacity inverters shown in FIG 1.
FIG 5 is a schematic configuration diagram showing an example of an entire
configuration ofa cubicle ofthe large-capacity inverter shown in FIG 4.
30 [Description of Embodiments]
In embodiments described below, a plurality of embodiments or sections will be
described separately as necessary for the sake of convenience. These are not those having no
relation to each other but have such relations to each other that one is a modification, a detail, a
supplemental explanation, or the like for part or all of the others. In addition, in the
- 5 -
embodiments described below, when the number and the like of elements (including the number,
a numerical value, an amount, a range, and the like) are mentioned, such number is not limited to
any specific number and may be a number more or less than the specific number, except the case
where the specific number is clearly specified, the case where the number is obviously limited to
5 the specific number in principle, and the like.
Moreover, in the embodiments described below, it goes without saying that
constituent elements (including element steps and the like) ofthe embodiments are not
necessarily required, except the case where the constituent element is described specifically as
being required, the case where the constituent element is considered to be obviously required in
10 principle, and the like. In the same manner, in the embodiments described below, when the
shape, the positional relation, or the like ofthe constituent elements or the like is mentioned, it
should be understood that the shape or the like encompasses those substantially close or similar
to the shape or the like, except the case where the shape or the like is specifically described, the
case where the shape or the like is not obviously such shape or the like in principle, and the like.
15 The same is true for the above-mentioned numerical value and range.
[Summary of an embodiment ofthe present invention]
A cubicle for large-capacity inverters (a corresponding constituent element, a
reference numeral, and the like are given in parenthesis as an example), which is an embodiment
of the present invention, includes: a pair of frames including an upper frame (beams 25 to 28)
20 and a lower frame (beams 21 to 24); a plurality of columns (columns 31 to 34) arranged
respectively at comers of the pair of frames for coupling the pair of frames to each other; and a
plurality of comer members (comer members 41 to 48) arranged respectively at the comers of
each ofthe pair of frames and each having a contact surface which comes into contact with a
corresponding one of the pair offrames and a contact surface which comes into contact with a
25 corresponding one ofthe plurality of columns.
In addition, fastening-member insertion through-holes (fastening-member
insertion through-holes 1 to 12) are formed in the contact surfaces ofthe plurality of comer
members as well as in facing surfaces where the comers ofthe upper frame or the lower frame of
the pair of frames, or the comers ofthe pair of frames, and axial end portions ofthe plurality of
30 columns face each other. The upper frame or the lower frame ofthe pair of frames, or the pair
of frames, and the plurality of columns are joined to each other via the plurality of comer
members by fastening fastening members inserted in the fastening-member insertion throughholes
(FIG. 2). Moreover, the plurality of comer members, the upper frame or the lower frame
of the pair of frames, or the pair of frames, and the plurality of columns are joined to each other
- 6 -
by welding (FIG. 3). As described above, the cubicle for large-capacity inverters is
characterized in that the comer members are joined by using the fastening members and the
welding in combination, and further, the fastening members are rivets (rivets 60 to 65).
With the above-described characteristics, rivets are used as the fastening
5 members. After the members of the cubicle are fastened by using the comer members and the
rivets, the comer members, the pair of frames, and the plurality of columns are welded to each
other. This enables to easily achieve the positioning ofthe members relative to each other by
the rivet fastening and also to suppress an increase in production cost because no time for the
work of positioning the members at the time of welding is generated. Furthennore, the joining
10 of the comer members using the rivet fastening and the welding in combination enables to
achieve sufficient strength and impact resistance for a cubicle for large-capacity inverters, which
incorporates heavy components.
One embodiment ofthe present invention based on the above-described summary
of an embodiment ofthe present invention will be described below in detail on the basis of the
15 drawings. Note that the same members are basically denoted by the same reference numerals in
all the drawings for explaining the embodiment and repetitive description for the members will
be omitted.
In addition, an example will be described below in which the subject ofthe
comer-member combination joining is both ofthe upper frame and the lower frame, each of the
20 upper and lower frames is fonned ofa plurality ofbeams arranged in a quadrangular shape, and
the comer members are joined to axial end portions ofthe columns. However, the present
invention is also applicable in the same manner to an example in which the subject of the comermember
combination joining is one ofthe upper frame and the lower frame, an example in which
the upper frame and/or the lower frame is fonned of a plurality of beams arranged in a polygonal
25 shape (for example, a pentagonal shape or a shape with more than five straight sides and more
than five angles), an example in which the comer members are not necessarily joined to the axial
end portions of the columns, an example in which the upper and lower frames are a pair of
frames each fonned in a polygonal shape or a quadrangular shape, and the like.
[One Embodiment ofthe Present Invention]
30 A cubicle for large-capacity inverters which is one embodiment of the present
invention and a large-capacity inverter mounted in the cubicle for large-capacity inverters will be
described with reference to FIGS. 1 to 5.

A cubicle for large-capacity inverters which is the embodiment will be described
- 7 -
by using FIG. 1. FIG. 1 is a perspective view showing an example of an entire configuration of
the cubicle for large-capacity inverters.
The cubicle for large-capacity inverters ofthe embodiment includes: four beams
21,22,23, and 24 arranged in a quadrangular shape in a lower frame; four beams 25, 26, 27, and
5 28 arranged in a quadrangular shape in an upper frame; four columns 31, 32, 33, and 34 arranged
respectively at four comers ofthe upper frame and the lower frame for coupling the upper frame
and the lower frame to each other; four comer members 41, 42, 43, and 44 arranged respectively
at the four comers ofthe lower frame and each having a contact surface which comes into
contact with the lower frame and a contact surface which comes into contact with a
10 corresponding one ofthe four columns 31, 32, 33, and 34; and four comer members 45, 46, 47,
and 48 arranged respectively at the four comers of the upper frame and having a contact surface
which comes into contact with the upper frame and a contact surface which comes into contact
with a corresponding one ofthe four columns 31,32,33, and 34.
As described above, the frame ofthe cubicle includes a pair of frames, the upper
15 frame and the lower frame. The lower frame is formed ofthe beams 21, 22, 23, and 24 coupled
in a quadrangular shape, and the upper frame is formed ofthe beams 25, 26, 27, and 28 coupled
in a quadrangular shape. Further, the upper frame and the lower frame are coupled to each
other by the four columns 31, 32, 33, and 34. In addition, the four comer members 41, 42, 43,
and 44 are arranged respectively at the four comers ofthe lower frame, and the four comer
20 members 45, 46, 47, and 48 are arranged respectively at the four comers of the upper frame.
Next, the coupling portions ofthe cubicle for large-capacity inverters shown in
FIG. 1 will be described by using FIG. 2. FIG. 2 is an exploded perspective view showing in
detail a coupling portion of the cubicle for large-capacity inverters. FIG. 2 shows the coupling
portion using the comer member 41 shown in FIG. 1 (the coupling portion between the beam 21
25 and the beam 22 of the lower frame, the column 31, and the comer member 41). The same is
applied to the coupling portions using the other comer members 42, 43, 44, 45,46,47, and 48.
As shown in FIG. 2, the comer member 41 is formed to have flat surfaces 52, 53,
and 54 orthogonal to each other. The flat surface 52 forms contact surfaces and facing surfaces
against a flat surface 50 of the column 31 and a flat surface 55 ofthe beam 21 while the flat
30 surface 53 forms contact surfaces and facing surfaces against a flat surface 51 of the column 31
and a flat surface 56 ofthe beam 22. In addition, a cut 59 is formed between the flat surface 52
and the flat surface 53.
In addition, a fastening-member insertion through-hole 11 is formed in the flat
surface 52 corresponding to a fastening-member insertion through-hole 9 ofthe beam 21.
- 8 -
Further, fastening-member insertion through-holes 5 and 6 are formed in the flat surface 52
corresponding to fastening-member insertion through-holes 1 and 2 of the column 31. On the
. other hand, a fastening-member insertion through-hole 12 is formed in the flat surface 53
corresponding to a fastening-member insertion through-hole 10 ofthe beam 22. Further,
5 fastening-member insertion through-holes 7 and 8 are formed in the flat surface 53
corresponding to fastening-member insertion through-holes 3 and 4 ofthe column 31.
The column 31 is formed as an L-shaped frame body having flat surfaces 50 and
51 orthogonal to each other. In addition, the fastening-member insertion through-holes 1 and 2
are formed in the flat surface 50 at the axial end portion of the column 31 corresponding to the
10 fastening-member insertion through-holes 5 and 6 ofthe comer member 41. On the other hand,
the fastening-member insertion through-holes 3 and 4 are formed in the flat surface 51 at the
axial end portion of the column 31 corresponding to the fastening-member insertion throughholes
7 and 8 ofthe comer member 41.
The beam 21 is formed as an L-shaped frame body having flat surfaces 55 and 57
15 orthogonal to each other. In addition, the fastening-member insertion through-hole 9 is formed
in the flat surface 55 corresponding to the fastening-member insertion through-hole 11 ofthe
comer member 41. The beam 22 is formed as an L-shaped frame body having flat surfaces 56
and 58 orthogonal to each other. In addition, the fastening-member insertion through-hole lOis
formed in the flat surface 56 corresponding to the fastening-member insertion through-hole 12 of
20 the comer member 41.
The comer member 41, the column 31, the beam 21, and the beam 22 are fastened
by inserting rivets 60, 61, 62, and 63 into the fastening-member insertion through-holes 5, 6, 7,
and 8 of the comer member 41 from the fastening-member insertion through-holes 1,2,3, and 4
ofthe column 31, respectively, and by inserting rivets 64 and 65 into the fastening-member
25 insertion through-holes 11 and 12 ofthe comer member 41 from the fastening-member insertion
through-holes 9 and 10 ofthe beams 21 and 22, respectively.
The coupling portions using the comer members 42,43, and 44 at the other lower
frame are also configured in the same manner as that of the comer member 41. The coupling
portion using the comer member 42 is configured by the beam 22 and the beam 23 of the lower
30 frame, the column 32, and the comer member 42. The coupling portion using the comer
member 43 is configured by the beam 23 and the beam 24 of the lower frame, the column 33,
and the comer member 43. The coupling portion using the comer member 44 is configured by
the beam 24 and the beam 21 of the lower frame, the column 34, and the comer member 44.
The coupling portions using the comer members 45, 46, 47, and 48 at the upper
- 9 -
frame are also configured in the same manner. The coupling portion using the comer member
45 is configured by the beam 25 and the beam 26 ofthe upper frame, the column 31, and the
comer member 45. The coupling portion using the comer member 46 is configured by the
beam 26 and the beam 27 ofthe upper frame, the column 32, and the comer member 46. The
5 coupling portion using the comer member 47 is configured by the beam 27 and the beam 28 of
the upper frame, the column 33, and the comer member 47. The coupling portion using the
comer member 48 is configured by the beam 28 and the beam 25 ofthe upper frame, the column
34, and the comer member 48.
The upper frame and the lower frame configured as described above are each
10 formed in the same quadrangular shape, and the beam, the column, and the comer member are
joined to each other by fastening the inserted rivets at each ofthe four comers of the upper frame
and the lower frame.
Next, with reference to FIGS. 1 and 2 mentioned above, a method of assembling
the cubicle for large-capacity inverters with the above-described configuration will be described
15 by using FIG. 3. FIG. 3 is an inner-side perspective view showing in detail the joint portion by
welding combined with rivet fastening at each coupling portion of the cubicle for large-capacity
inverters.
When the cubicle for large-capacity inverters with the above-described
configuration is to be assembled, the upper frame formed ofthe four beams 21 to 24, the lower
20 frame formed ofthe four beams 25 to 28, the four columns 31 to 34, and the eight comer
members 41 to 48 are brought into an assembling device in the state before a coating film of
paint, plating, or the like is applied to the surfaces.
First, the upper frame and the lower frame are arranged to face each other in a
horizontal direction by use of the assembling device. Then, the comer members 45 and 41 are
25 disposed at the respective comers, for example, the comers where the column 31 is to be
disposed, out ofthe four comers ofthe upper frame and the lower frame. Thereafter, the rivets
60 to 63 are inserted respectively into the fastening-member insertion through-holes 5, 6, 7, and
8 of the comer members 45 and 41 from the fastening-member insertion through-holes 1,2,3,
and 4 ofthe column 31. In addition, the rivets 64 and 65 are inserted into the fastening-member
30 insertion through-holes 11 and 12 of the comer members 45 and 41 from the fastening-member
insertion through-holes 9 and 10 of the beams 25 and 26 ofthe upper frame and the beams 21
and 22 ofthe lower frame. Then, the front ends ofthe rivets 60 to 65 are riveted to join the
upper frame and the lower frame to the column 31 via the comer members 45 and 41. At this
time, electrical conduction between the members is established.
- 10-
Further, after the one column 31 is attached, the upper frame and the lower frame
are turned and the other comer members 46 to 48 and 42 to 44 as well as the other columns 32 to
34 are disposed sequentially at the other comers ofthe upper frame and the lower frame, and the
same work as described above is repeated. As a result, the columns 31 to 34 can be assembled
5 to the four comers ofthe upper frame and the lower frame via the comer members 41 to 48 by
rivet fastening.
After the members are assembled by such assembling, at the coupling portion
using the comer member 41 for example, as shown in FIG. 3, a welded portion 70 at the joined
end portion ofthe column 31 and the comer member 41 joined by the rivets 60 to 63, a welded
10 portion 71 at the joined end portion ofthe beam 21 and the comer member 41 joined by the rivet
64, and a welded portion 72 at the joined end portion of the beam 22 and the comer member 41
joined by the rivet 65 are joined by welding. At this time, while the joining is achieved by the
fastening the rivets 60 to 65, the welding work can be performed with no requirement of the
positioning work at the welding. Therefore, the production costs, which would be increased
15 due to an increase ofthe work time, can be reduced.
The same applied to the coupling portions using the other comer members 42 to
48. A welded portion at the joined end portion of each column and each comer member and a
welded portion at the joined end portion of each beam and each comer member are joined by
welding.
20 After the assembling is completed, a coating film of paint, plating, or the like is
applied to the front surface and the back surface ofthe cubicle. In this event, a coating liquid
applied to the cubicle, for example, may be flowed to the outside through the cut 59 formed
between the flat surface 52 and the flat surface 53 of each ofthe comer members 41 to 48 such
that the coating liquid does not remain in the comers ofthe upper frame and the lower frame, and
25 the like. In this way, the cut 59 of each of the comer members 41 to 48 can be functioned as a
discharge passage for each treatment liquid used in treatment, such as painting, plating, or the
like.

A large-capacity inverter mounted in the cubicle for large-capacity inverters with
30 the above-described configuration will be described by using FIGS. 4 and 5. FIG. 4 is a
schematic circuit diagram showing an example ofa circuit configuration ofthe large-capacity
inverter. FIG. 5 is a schematic configuration diagram showing an example of an entire
configuration of the cubicle of the large-capacity inverter.
As shown in FIG. 4, the large-capacity inverter includes a converter board 81, a
- 11 -
control board 80 connected to the converter board 81, and an inverter board 82 connected to the
control board 80. In the large-capacity inverter, an input side of the converter board 81 is
connected to an external AC power supply 83 and an output side ofthe inverter board 82 is
connected to a motor 84, which is to be controlled.
5 In the large-capacity inverter, an AC voltage (current I) is inputted from the
external AC power supply 83. The AC voltage is converted to a DC voltage by the converter
board 81. Further, the DC voltage is converted to an AC voltage having a predetermined
frequency by the inverter board 82. The AC voltage thus obtained (current 1m) is outputted to
the motor 84, so that the operation ofthe motor 84 is controlled. To control this series of
10 operation, the control board 80 is disposed between the converter board 81 and the inverter board
82.
IGBT units are employed for both of the conversion from the AC voltage to the
DC voltage by the converter board 81 and the conversion from the DC voltage to the AC voltage
by the inverter board 82. The converter board 81 is configured ofR-phase, S-phase, and T-
15 phase IGBT units 90 to 92 while the inverter board 82 is configured of V-phase, V-phase, and Wphase
IGBT units 93 to 95.
As shown in FIG 5, a cubicle ofthe large-capacity inverter is configured ofa
five-series cubicle formed by coupling five cubicles each of which is the above-described cubicle
for large-capacity inverters shown in FIG 1. In FIG 5, two cubicles on the left side constitute
20 the converter board 81, one cubicle at the center constitutes the control board 80, and two
cubicles on the right side constitute the inverter board 82. The R-phase IGBT unit 90, the Sphase
IGBT unit 91, and the T-phase IGBT unit 92 are mounted in the converter board 81
constituted of the two cubicles. The V-phase IGBT unit 93, the V-phase IGBT unit 94, and the
W-phase IGBT unit 95 are mounted in the inverter board 82 constituted of the two cubicles.
25 As described above, the large-capacity inverter as shown in FIG 4 is configured
by the five-series cubicle as shown in FIG 5.

As described above, the cubicle for large-capacity inverters ofthe Embodiment
includes: the pair of frames including the upper frame formed of the beams 25 to 28 and the
30 lower frame formed ofthe beams 21 to 24; the four columns 31 to 34 arranged respectively at
the corners of the upper frame and the lower frame for coupling the upper frame and the lower
frame to each other; and the plurality of corner members 41 to 48 arranged respectively at the
corners of each of the upper frame and the lower frame and each having the contact surface
which comes into contact with a corresponding one of the upper frame and the lower frame and
- 12 -
the contact surface which comes into contact with a corresponding one of the four columns 31 to
34.
In addition, the fastening-member insertion through-holes 1 to 12 are formed in
the contact surfaces ofthe plurality ofcomer members 41 to 48 as well as in the facing surfaces
5 where the four comers ofthe upper frame and the lower frame and the axial end portions of the
four columns 31 to 34 face each other. Then, the upper frame and the lower frame and the four
columns 31 to 34 are joined to each other via the plurality of comer members 41 to 48 by
fastening the rivets 60 to 65 inserted in the fastening-member insertion through-holes 1 to 12.
Moreover, the plurality ofcomer members 41 to 48, the upper frame and the lower frame, and
10 the four columns 31 to 34 are joined to each other by welding. As described above, the comer
members 41 to 48 are joined by using the rivets 60 to 65 and the welding in combination,
bringing about the following advantageous effects.
Specifically, according to the above-described characteristics, the rivets 60 to 65
are used as fastening members. After the members ofthe cubicle are fastened by using the
15 comer members 41 to 48 and the rivets 60 to 65, the comer members 41 to 48, the upper frame
and the lower frame formed ofthe plurality of beams 21 to 28, and the plurality of columns 31 to
34 are welded. This enables to easily achieve the positioning of the members relative to each
other by the rivet fastening and also to suppress an increase in production cost because no time
for the work of positioning the members at the time of welding is generated.
20 Furthermore, the joining ofthe comer members 41 to 48 using the rivets fastening
and the welding in combination enables to achieve sufficient strength and impact resistance for a
cubicle for large-capacity inverters, which incorporates heavy components.
In addition, since the cut 59 is formed between the flat surface 52 and the flat
surface 53 of each ofthe comer members 41 to 48, the cut 59 can be functioned as a discharge
25 passage for each treatment liquid used in treatment, such as painting, plating, or the like, such
that the coating liquid does not remain in the comers ofthe upper frame and the lower frame, and
the like.

In the embodiment, the example has been described in which the subject of the
30 comer-member combination joining is both ofthe upper frame and the lower frame, each of the
upper and lower frames is formed ofa plurality of beams arranged in a quadrangular shape, and
the comer members are joined to axial end portions ofthe columns. However, the present
invention is not limited to this example and is applicable in the same manner to an example in
which the subject of the comer-member combination joining is one of the upper frame and the
- 13 -
lower frame, an example in which the upper frame and/or the lower frame is formed of a
plurality of beams arranged in a polygonal shape (for example, a pentagonal shape or a shape
with more than five straight sides and more than five angles), an example in which the comer
members are not necessarily joined to the axial end portions of the columns, an example in
5 which the upper and lower frames are a pair of frames each formed in a polygonal shape or a
quadrangular shape, and the like. Configurations as described below may thus be conceivable
of. The same advantageous effects can be achieved by the configurations as described below.
(1) A cubicle for large-capacity inverters (a constituent element, a reference
numeral, and the like corresponding to the above-described embodiment are given in parenthesis
10 as an example) includes: a pair of frames including an upper frame (beams 25 to 28) and a lower
frame (beams 21 to 24) each formed of a plurality ofbeams arranged in a polygonal shape; a
plurality of columns (columns 31 to 34) arranged respectively at comers ofthe pair of frames for
coupling the pair of frames to each other; and a plurality of comer members (comer members 41
to 48) arranged respectively at the comers of each ofthe pair of frames and each having a
15 contact surface which comes into contact with a corresponding one of the pair of frames and a
contact surface which comes into contact with a corresponding one ofthe plurality of columns.
Fastening-member insertion through-holes (fastening-member insertion through-holes 1 to 12)
are formed in the contact surfaces of the plurality of comer members as well as in facing surfaces
where the upper frame or the lower frame ofthe pair offrames and axial end portions of the
20 plurality of columns face each other, the upper frame or the lower frame and the plurality of
columns are joined to each other via the plurality of comer members by fastening fastening
members inserted in the fastening-member insertion through-holes (FIG 2), the plurality of
comer members, the upper frame or the lower frame, and the plurality ofcolumns are joined to
each other by welding (FIG 3), and the comer members are joined by using the fastening
25 members and the welding in combination. Further, the fastening members are rivets (rivets 60
to 65).
(2) A cubicle for large-capacity inverters (a constituent element, a reference
numeral, and the like corresponding to the above-described embodiment are given in parenthesis
as an example) includes: a pair of frames including an upper frame (beams 25 to 28) and a lower
30 frame (beams 21 to 24) each formed of a plurality of beams arranged in a polygonal shape; a
plurality of columns (columns 31 to 34) arranged respectively at comers ofthe pair of frames for
coupling the pair of frames to each other; and a plurality of comer members (comer members 41
to 48) arranged respectively at the comers of each ofthe pair of frames and each having a
contact surface which comes into contact with a corresponding one ofthe pair of frames and a
- 14 -
contact surface which comes into contact with a corresponding one ofthe plurality of columns.
Fastening-member insertion through-holes (fastening-member insertion through-holes 1 to 12)
are formed in the contact surfaces of the plurality of corner members as well as in facing surfaces
where the pair of frames and axial end portions of the plurality of columns face each other, the
5 pair of frames and the plurality of columns are joined to each other via the plurality of corner
members by fastening fastening members inserted in the fastening-member insertion throughholes
(FIG. 2), the plurality ofcorner members, the pair of frames, and the plurality of columns
are joined to each other by welding (FIG. 3), and the corner members are joined by using the
fastening members and the welding in combination. Further, the fastening members are rivets.
10 (3) A cubicle for large-capacity inverters (a constituent element, a reference
numeral, and the like corresponding to the above-described embodiment are given in parenthesis
as an example) includes: a pair of frames (beams 25 to 28, beams 21 to 24) each formed in a
polygonal shape; a plurality of columns (columns 31 to 34) arranged respectively at corners of
the pair of frames for coupling the pair of frames to each other; and a plurality ofcorner
15 members (corner members 41 to 48) arranged respectively at the corners of each ofthe pair of
frames and each having a contact surface which comes into contact with a corresponding one of
the pair of frames and a contact surface which comes into contact with a corresponding one of
the plurality of columns. Fastening-member insertion through-holes (fastening-member
insertion through-holes 1 to 12) are formed in the contact surfaces ofthe plurality of corner
20 members as well as in facing surfaces where the pair of frames and axial end portions ofthe
plurality of columns face each other, the pair of frames and the plurality of columns are joined to
each other via the plurality of corner members by fastening fastening members inserted in the
fastening-member insertion through-holes (FIG. 2), the plurality of corner members, the pair of
frames, and the plurality of columns are joined to each other by welding (FIG. 3), and the corner
25 members are joined by using the fastening members and the welding in combination. Further,
the fastening members are rivets.
(4) A cubicle for large-capacity inverters (a constituent element, a reference
numeral, and the like corresponding to the above-described embodiment are given in parenthesis
as an example) includes: a pair of frames (beams 25 to 28, beams 21 to 24) each formed in a
30 polygonal shape; a plurality ofcolumns (columns 31 to 34) arranged respectively at corners of
the pair of frames for coupling the pair of frames to each other; and a plurality ofcorner
members (corner members 41 to 48) arranged respectively at the corners of each ofthe pair of
frames and each having a contact surface which comes into contact with a corresponding one of
the pair of frames and a contact surface which comes into contact with a corresponding one of
- 15 -
the plurality of columns. Fastening-member insertion through-holes (fastening-member
insertion through-holes 1 to 12) are formed in the contact surfaces ofthe plurality of comer
members as well as in facing surfaces where the comers of the pair of frames and axial end
portions of the plurality of columns face each other, the pair of frames and the plurality of
5 columns are joined to each other via the plurality of comer members by fastening fastening
members inserted in the fastening-member insertion through-holes (FIG. 2), the plurality of
comer members, the pair of frames, and the plurality ofcolumns are joined to each other by
welding (FIG. 3), and the comer members are joined by using the fastening members and the
welding in combination. Further, the fastening members are rivets.
10 (5) A cubicle for large-capacity inverters (a constituent element, a reference
numeral, and the like corresponding to the above-described embodiment are given in parenthesis
as an example) includes: a pair of frames (beams 25 to 28, beams 21 to 24) each formed in a
quadrangular shape; four columns (columns 31 to 34) arranged respectively at four comers ofthe
pair of frames for coupling the pair of frames to each other; and a plurality of comer members
15 (comer members 41 to 48) arranged at the four comers of each ofthe pair of frames and each
having a contact surface which comes into contact with a corresponding one ofthe pair of frames
and a contact surface which comes into contact with a corresponding one of the four columns.
Fastening-member insertion through-holes (fastening-member insertion through-holes 1 to 12)
are formed in the contact surfaces ofthe plurality of comer members as well as in facing surfaces
20 where the four comers of the pair of frames and axial end portions ofthe four columns face each
other, the pair of frames and the four columns are joined to each other via the plurality ofcomer
members by fastening fastening members inserted in the fastening-member insertion throughholes
(FIG. 2), the plurality of comer members, the pair of frames, and the four columns are
joined to each other by welding (FIG. 3), and the comer members are joined by using the
25 fastening members and the welding in combination. Further, the fastening members are rivets.
The invention made by the present inventor has been described so far on the basis
of the embodiments, it goes without saying that the present invention is not limited to the abovedescribed
embodiments and various modifications may be made without departing from the gist
ofthe present invention.
30 The cubicle for inverters of the present invention is available as a cubicle for
large-capacity inverters, which is suitably used for mounting electronic instruments such as a
control device, and is particularly suitable as a cubicle for large-capacity inverters, which
incorporates heavy components.

[Claim 2]
CLAIMS:
[Claim 1]
- 16-
A cubicle for inverters, comprising:
a pair of frames including an upper frame and a lower frame each formed ofa
plurality of beams arranged in a polygonal shape;
a plurality ofcolumns arranged respectively at corners of the pair of frames for
coupling the pair of frames to each other; and
a plurality of corner members arranged respectively at the corners of each of the
pair of frames and each having a contact surface which comes into contact with a corresponding
one of the pair of frames and a contact surface which comes into contact with a corresponding
one of the plurality of columns, wherein
fastening-member insertion through-holes are formed in the contact surfaces of
the plurality of corner members as well as in facing surfaces where the upper frame or the lower
frame ofthe pair of frames and axial end portions of the plurality of columns face each other,
the upper frame or the lower frame and the plurality of columns are joined to each
other via the plurality of corner members by fastening fastening members inserted in the
fastening-member insertion through-holes,
the plurality of corner members, the upper frame or the lower frame, and the
plurality of columns are joined to each other by welding,
the corner members are joined by using the fastening members and the welding in
combination, and
the fastening members are rivets.
A cubicle for inverters, comprising:
a pair of frames including an upper frame and a lower frame each formed of a
plurality of beams arranged in a polygonal shape;
a plurality of columns arranged respectively at corners of the pair of frames for
coupling the pair of frames to each other; and
a plurality ofcorner members arranged respectively at the corners of each ofthe
pair of frames and each having a contact surface which comes into contact with a corresponding
one of the pair of frames and a contact surface which comes into contact with a corresponding
one of the plurality of columns, wherein
fastening-member insertion through-holes are formed in the contact surfaces of
the plurality of corner members as well as in facing surfaces where the pair of frames and axial
end portions ofthe plurality ofcolumns face each other,
the pair of frames and the plurality ofcolumns are joined to each other via the
- 17 -
plurality of comer members by fastening fastening members inserted in the fastening-member
insertion through-holes,
the plurality of comer members, the pair of frames, and the plurality of columns
are joined to each other by welding,
the corner members are joined by using the fastening members and the welding in
combination, and
the fastening members are rivets.
[Claim 3] A cubicle for inverters, comprising:
a pair of frames each formed in a quadrangular shape, the pair of frames including
an upper frame and a lower frame each formed of a plurality ofbeams arranged in a
quadrangular shape;
four columns arranged respectively at four corners ofthe pair of frames for
coupling the pair of frames to each other; and
a plurality of corner members arranged respectively at the corners of each of the
pair of frames and each having a contact surface which comes into contact with a corresponding
one of the pair of frames and a contact surface which comes into contact with a corresponding
one of the plurality of columns, wherein
fastening-member insertion through-holes are formed in the contact surfaces of
the plurality of corner members as well as in facing surfaces where the four corners ofthe pair of
frames and axial end portions ofthe four columns face each other,
the pair of frames and the four columns are joined to each other via the plurality
of corner members by fastening fastening members inserted in the fastening-member insertion
through-holes,
the plurality of corner members, the pair of frames, and the four columns are
joined to each other by welding,
the corner members are joined by using the fastening members and the welding in
combination, and
the fastening members are rivets.
[Claim 4] A cubicle for inverters, comprising:
a pair of frames each formed in a polygonal shape;
a plurality of columns arranged respectively at comers ofthe pair of frames for
coupling the pair of frames to each other; and
a plurality of corner members arranged respectively at the corners of each ofthe
pair of frames and each having a contact surface which comes into contact with a corresponding
- 18 -
one of the pair of frames and a contact surface which comes into contact with a corresponding
one of the plurality of columns, wherein
fastening-member insertion through-holes are formed in the contact surfaces of
the plurality of comer members as well as in facing surfaces where the pair of frames and axial
end portions of the plurality of columns face each other,
the pair of frames and the plurality of columns are joined to each other via the
plurality of comer members by fastening fastening members inserted in the fastening-member
insertion through-holes,
the plurality of comer members, the pair of frames, and the plurality ofcolumns
are joined to each other by welding,
the comer members are joined by using the fastening members and the welding in
combination, and
the fastening members are rivets.
[Claim 5] A cubicle for inverters, comprising:
a pair of frames each formed in a polygonal shape;
a plurality ofcolumns arranged respectively at comers of the pair of frames for
coupling the pair of frames to each other; and
a plurality of comer members arranged respectively at the comers ofeach of the
pair of frames and each having a contact surface which comes into contact with a corresponding
one ofthe pair of frames and a contact surface which comes into contact with a corresponding
one ofthe plurality of columns, wherein
fastening-member insertion through-holes are formed in the contact surfaces of
the plurality of comer members as well as in facing surfaces where the comers ofthe pair of
frames and axial end portions ofthe plurality of columns face each other,
the pair of frames and the plurality of columns are joined to each other via the
plurality of comer members by fastening fastening members inserted in the fastening-member
insertion through-holes,
the plurality of comer members, the pair of frames, and the plurality of columns
are joined to each other by welding,
the comer members are joined by using the fastening members and the welding in
combination, and
the fastening members are rivets.
[Claim 6] A cubicle for inverters, comprising:
a pair of frames each formed in a quadrangular shape;
- 19-
four columns arranged respectively at four comers of the pair of frames for
coupling the pair of frames to each other; and
a plurality of comer members arranged at the four comers of each of the pair of
frames and each having a contact surface which comes into contact with a corresponding one of
the pair of frames and a contact surface which comes into contact with a corresponding one of
the four columns, wherein
fastening-member insertion through-holes are formed in the contact surfaces of
the plurality of comer members as well as in facing surfaces where the four comers ofthe pair of
frames and axial end portions ofthe four columns face each other,
the pair of frames and the four columns are joined to each other via the plurality
of comer members by fastening fastening members inserted in the fastening-member insertion
through-holes,
the plurality of comer members, the pair of frames, and the four columns are
joined to each other by welding,
the comer members are joined by using the fastening members and the welding in
combination, and
the fastening members are rivets.
[Claim 7] The cubicle for inverters according to claim 1, wherein
each ofthe comer members has a first flat surface, a second flat surface, and a
third flat surface orthogonal to each other,
the first flat surface and the second flat surface are joined to a corresponding one
of the frames and a corresponding one of the columns, and
a cut is formed between the first flat surface and the second flat surface.
[Claim 8] A cubicle for inverters, substantially as herein described with reference to
accompanying drawings and example.