Switchgear cabinet with frame

A switchgear cabinet with a frame made up of frame members and corner joints. The open sides of the frame are or may be closed by side walls, a rear wall, a bottom plate, a cover plate and at least one door. A special design of the frame members in the area of their outer edges and of the corner joints makes it simple to attach a door.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to a switchgear cabinet with a rack constructed of 
frame legs and corner connectors, with open sides that can be closed or 
are closed by lateral walls, and having a rear wall, a sheet metal bottom 
piece, a sheet metal cover piece and at least one door. 
2. Description of Prior Art 
In conventional switchgear cabinets, two profiled sides of the frame legs 
placed vertically with respect to each other normally form exteriors of 
the rack and one of the exterior edges of the rack. For hinging such door 
it is necessary to attach hinge elements on the vertical frame legs. In 
addition, on the lock side of the door it is necessary to attach locking 
elements for the locking device attached to the door. In this case the 
attachment side of the door to the rack is often fixed and cannot be 
changed in a simple manner at the place where the switchgear cabinet is 
used. Normally, an open side of the rack is closed by the door. 
SUMMARY OF THE INVENTION 
In connection with a switchgear cabinet of the type mentioned above, it is 
one object of this invention to hinge a door on a rack without special 
hinge and closing elements, wherein the attachment side and the closing 
side can be easily interchanged and wherein the door intended for one side 
of the rack can also be arbitrarily attached to the opposite side of the 
rack. 
This object is attained in accordance with one preferred embodiment of this 
invention wherein at least the vertical frame legs are beveled in an area 
of outer edges and thus constitute a receiver for beveled edges of the 
lateral walls and the door. The corner connectors cover the receivers of 
the frame legs and have on a side facing the receivers plug receivers or 
hinge bolts. On a hinge side the door has hinge bolts or plug receivers, 
which can be inserted or are inserted into the plug receivers of the 
corner connectors, or into which the hinge bolts of the door are inserted 
or can be inserted. On a lock side the door has locking bolts, which can 
be inserted into and removed from plug receivers of the corner connectors 
by a closure device. 
With this embodiment of the frame legs and corner connectors, the corner 
connectors also assume functions required for hinging and locking the 
door. What is needed is to provide plug receivers or hinge bolts on the 
corner connectors. The frame legs do not need to have hinge or locking 
elements. The receivers formed on the frame legs in an area of the outer 
edges provide sufficient space for receiving the beveled edge sections of 
the lateral walls and the door. 
In accordance with one embodiment of this invention, the frame legs have 
two profiled sides placed vertically with respect to each other, which 
form exteriors of the rack. The profiled sides are connected with each 
other in an area of the outer edge by a profiled connecting section, which 
is placed at an angle of 135.degree. with respect to these profiled sides. 
With this embodiment the frame leg can be used as the hinge or lock side 
of the door for both adjoining sides of the rack. 
The receiver in the area of the outer edge of the frame legs can be 
enlarged if the profiled sides make a transition into the connecting 
section with profiled transition sections which are placed vertically with 
respect to each other. 
If the corner connectors have two surfaces located vertically with respect 
to each other, which constitute portions of the outer edges of the rack, 
and the surfaces terminate flush with the exteriors of the adjoining 
lateral walls and the closed door, there is a flush termination in a 
corner area of the switchgear cabinet. 
In accordance with one embodiment, screws connect the lateral walls, the 
rear wall, the sheet metal bottom piece and the sheet metal cover piece to 
the corner connectors. Fastening on the frame legs is also possible 
without the wall elements having fastening bores for fastening screws. 
Attachment of the door on the rack is made easier by the hinge bolts or 
locking bolts being adjustably guided and/or maintained in bearing sleeves 
attached to the door. 
The hinging of a door can also be performed in a simple manner with the 
hinge bolts, guided through bearing sleeves of the door, inserted into 
plug receivers of the corner connectors and held therein with a snug fit 
and/or a press fit.

DESCRIPTION OF PREFERRED EMBODIMENTS 
Only the vertical frame legs 11 and 12 at the front right corner and the 
rear left corner of a rack 10 are shown in FIG. 1. The horizontal frame 
legs 13 and 14 are connected by means of a corner connector 20 at the 
upper end of the vertical frame leg 11. The horizontal frame legs 15, 16, 
17 and 18 are shown in the lower area, of which the frame legs 15 and 18 
are connected by a corner connector 20 with the lower end of the vertical 
frame leg 11. The lateral walls 40 and 44 are screwed to the corner 
connectors 20, wherein in these areas the corners are beveled and without 
edges, as can be seen from the corner 43 of the lateral wall 40. The edge 
areas 41 and 45 of the lateral walls 40 and 44 project into receivers 70 
of the frame legs. As shown in FIG. 2, the frame legs are beveled in the 
area of their outer edge and form a receiver 70 together with the 
connecting section 53 and the transition sections 54 and 55. The corner 
connector 20 covers the receiver 70 with a shoulder 24. The shoulder 24 of 
the corner connector 20 has a plug receiver 21. The surfaces 22 and 23 of 
the corner connector 20, which are positioned vertically with respect to 
each other, are flush with the exteriors of the switchgear cabinet, such 
as the exteriors of lateral walls 40 and 44, the rear wall 46 and the door 
30 attached to the corner connector 20. The contact surfaces 25 and 26 for 
these elements are set back by the amount of their thickness with respect 
to the surfaces 22 and 23 of the corner connector 20 in order to achieve a 
flush fit. The contact surfaces 25 and 26 have threaded receivers 27 and 
28 for screwing. 
The plug projections 65 of the corner connectors 20 are inserted into 
receivers 62 and 63 of the frame legs and fixed therein. The receivers 62 
and 63 are delimited by multiple bent sections 56, 58, 59 or 57, 60, 61. 
The thrice bent sections 56 and 57 form receiving grooves, open toward the 
outside, for sealing elements. The receiving grooves 56 and 57 are located 
in the area of profile sides 51 and 52, which are placed vertically with 
respect to each other, and against which rest the lateral walls 40 and 44, 
the rear wall 46, the door 30 and the sheet metal bottom and cover pieces, 
not represented in the drawings. 
Hinge bolts, which can be adjusted and fixed in place, for example, in 
bearing sleeves of the door 30, are used for fastening the door 30. For 
fastening the door 30, the two hinge bolts on the hinge side are inserted 
into the plug receivers 21 of the two associated corner connectors 20 and 
fixed in place in the inserted position. 
In this case fixation in place can be in the bearing sleeve of the door 30 
or in the plug receiver 21 of the corner connectors 20. 
The lateral walls 40 and 44, the rear wall 46 and the door 30 can have 
beveled edge sections 41, 45, 47 or 32 and 33, that are accommodated in 
the receivers 70 of the frame legs 11 to 18. 
On the locking side the door 30 has a locking device 31 which can be 
embodied as a push rod lock, for example. The push rods are used as lock 
bolts 35 and are adjustably inserted and held in bearing sleeves of the 
door 30. In the locked state of the locking device 31, the push rod ends 
are introduced as lock bolts 35 into the plug receivers 21 of the 
adjoining corner connectors 20. When opening the locking device 31, the 
push rod ends are removed from the plug receivers 21 of the corner 
connectors 20, and the door 30, hinged on the hinge side, can be opened. 
The lateral walls, the rear wall, the sheet metal bottom piece and the 
sheet metal cover piece can be attached by fastening means not visible 
from the outside.