JPH0412719Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rack structure for electronic equipment, etc., in which printed boards are mounted in parallel, and particularly to a subrack mounting structure that is fixed to a gate-shaped main rack.

In recent years, electronic devices that use many printed boards,
There is a particularly strong demand for communication equipment and the like to be smaller and lighter. For this reason, it is widely practiced to arrange a large number of printed boards in parallel on box-shaped sub-racks made of thin plates, and to arrange these sub-racks vertically in parallel on a main rack made of channel materials or angle materials framed in a gate shape. There is.

At this time, it is desired that even if the main rack is slightly twisted, the printed board can be inserted into and removed from the subrack without any problem.

[Conventional technology]

FIG. 3 is a perspective view showing a state in which conventional subracks are arranged side by side, and FIG. 4 is a perspective view of the main parts.

In FIG. 3, a gate-shaped main rack 1 includes a flat bottom plate 4 fixed to the floor, and a pair of side frames 2 made of channel material fixed perpendicularly to the top of the bottom plate 4. and an upper frame 3 made of channel material that is cross-linked and fixed to the upper end of the side frame 2.

The sub-rack 5, into which the printed board 6 is inserted into each of the guides arranged in parallel opposite to the upper and lower side plates, is formed into a box shape using a thin metal plate. The sub-racks 5 are formed to have a width that is desirably smaller than the interval between the inner surfaces of the side frames 2 of the main rack 1, and are inserted into the portal shape of the main rack 1 so that they can be arranged vertically.

In order to fix the sub-rack 5 to the main rack 1, as shown in Fig.
Do it via 0.

The main rack-side mounting plate portion 12 of the mounting bracket 10 that is in close contact with the front side surface of the side frame 2 is provided with the side frame 2.
A plurality of horizontally long elongated holes 13 through which the necks of mounting screws 14 freely pass are provided corresponding to the screw holes 8 arranged in parallel at equal pitches above and below.

Mounting bracket 10 that fits tightly on the side plate 7 of the subrack 5
The sub-rack side mounting plate part 11 is provided with a plurality of mounting screw holes arranged vertically in parallel, through which the necks of the mounting screws 15 pass through, corresponding to the screw holes arranged vertically in parallel in the side plate 7. .

First, the mounting bracket 10 configured as described above is attached to the side plates 7 on both sides of the subrack 5 using the mounting screws 15.
Each is fixed. Next, insert the main rack 1 horizontally into the pair of side frames 2, select the desired screw holes 8, and fit the main rack side mounting plate 12 tightly to the front side of the side frames 2. Then, secure it with the mounting screws 14.

As described above, after the subracks 5 are fixed to the main rack 1, the printed boards 6 are inserted into each subrack 5.

On the other hand, the main rack 1 is frame-shaped. Therefore, it is difficult to provide a highly accurate distance between the screw holes 8 provided in each side frame 2. Furthermore, it is difficult to manufacture the width of the box-shaped sub-rack 5 made of a thin metal plate with high precision.

However, as described above, the hole through which the neck of the mounting screw 14 for fixing the mounting fitting 10 to the side frame 2 passes is the elongated hole 13. Therefore, even if the above-mentioned dimensional accuracy is low, the sub-rack 5 can be reliably fixed to the main rack 1.

[Problem that the invention attempts to solve]

However, the conventional main racks mentioned above are lightweight,
For the purpose of miniaturization, the side frame and upper frame formed in a gate shape, and the bottom plate are each of a welded structure. For this reason, the side frame is often twisted (as shown by the chain line M in FIG. 3) or tilted, and the mounting surfaces of the mounting brackets of the pair of side frames on both sides are not on the same plane.

If this happens, not only will it be difficult to fix the sub-rack, but the sub-rack will be stuck to the main rack in a distorted state, making it difficult to insert and remove printed boards, and the front plate will be placed on the opening surface of the sub-rack. This causes the problem that it becomes impossible to wear the .

On the other hand, increasing the thickness of the subrack or reinforcing the corners as a measure to prevent distortion of the subrack not only goes against the demand for weight reduction, but also strengthens the main rack as the weight of the subrack increases. The problem is that it has to be done.

[Means for solving problems]

The above conventional problem is that the neck of the mounting screw is loose in the main rack side mounting plate of the mounting bracket that is in close contact with the side frame of the main rack, corresponding to the screw holes parallel to the side frame. A long hole is provided in the horizontal direction,
The subrack-side mounting plate portion of the mounting bracket that is fixed to the side plate of the subrack has a plurality of stepped screws arranged vertically symmetrically around the central fixing screw hole, corresponding to the parallel screw holes in the side plate. The holes are arranged in parallel and the height of the stepped screw is larger than the plate thickness of the mounting bracket.The gap between the stepped screw hole and the stepped screw hole is the same as that between the fixing screw and the stepped screw hole. This problem is solved by the means of the present invention, in which the gap is formed smaller than the gap formed by the gap.

[Effect]

According to the above-mentioned means of the present invention, the mounting bracket, which is fixed to the side frame while tilting back and forth and left and right depending on the distortion of the main rack, can be fixed only at the center of the subrack side mounting plate by the fixing screw. It is tightly fixed to the side plate of. The fixing screws thus serve to prevent the subrack from swinging, and the stepped screws support the load of the subrack.

That is, the sub-rack can be fixed to the main rack while maintaining its original shape regardless of the distortion of the main rack, and the above-mentioned problem is eliminated.

〔Example〕

The gist of the present invention will be specifically explained below with reference to illustrated embodiments. Note that the same reference numerals indicate the same objects throughout the figures.

FIG. 1 is a perspective view of a main part of an embodiment of the present invention, FIG. 2a is a sectional view, and FIG. 2b is a plan view.

In Fig. 1 and Fig. 2 a, b, the side frame 2
The main rack-side mounting plate portion 22 of the mounting bracket 20, which is in close contact with the front side surface of the
A plurality of horizontally long elongated holes 23 are provided through which the neck portions of No. 4 freely pass.

Mounting bracket 20 that fits tightly on the side plate 7 of the subrack 5
A fixing screw hole 25 is provided in the sub-rack side mounting plate portion 21 in correspondence with a screw hole 27 provided in the center of the side plate 7 in the vertical direction. Furthermore, stepped screw holes 26 are provided in parallel in correspondence with a plurality of screw holes 28 that are vertically symmetrically provided with the screw hole 27 as the center.

The stepped screw 32, in which the stepped portion 32a loosely passes through the stepped screw hole 26 and the threaded portion is screwed into the screw hole 28, has a height of the stepped portion 32a greater than the plate thickness of the mounting bracket 20, and a gap H is formed.

On the other hand, the fixing screw hole 25 and the stepped screw hole 2
The hole diameters 6 are related such that the gap between the stepped portion 32a of the stepped screw 32 and the stepped screw hole 26 is smaller than the gap between the fixing screw 29 and the fixing screw hole 25. .

The mounting fitting 20 constructed in this manner is loosely fixed to the side plate 7 of the subrack 5 with a fixing screw 29 using a plate washer 31 and a spring washer 30. Also, the step portion 32a of the stepped screw 32 is inserted loosely into the stepped screw hole 26, and the stepped screw 32 is screwed into the screw hole 28 of the side plate 7.Next, the pair of side frames of the main rack 1 Insert the subrack 5 horizontally into the rack 2, select the desired screw hole 8, fit the main rack side mounting plate 22 tightly to the front side of the side frame 2, and secure it with the mounting screws 24. . Next, the fixing screw 29 is completely fixed.

In this way, the horizontal inclination of the main rack 1 within the same plane is dealt with by the elongated holes 23 as before.

In addition, in response to twisting of the main rack 1, each main rack side mounting plate part 22 is fixed to the corresponding side frame 2.
The mounting bracket 20 fits closely according to the deformed shape of the
is fixed to the side frame 2 while being inclined in the front-rear direction or left-right direction. However, on the subrack 5 side, only the center part of the subrack side mounting plate part 21 is closely fixed to the side plate 7 by the fixing screws 29, and the stepped screws 32
Parts have a degree of freedom.

That is, the fixing screws 29 serve to prevent the subrack 5 from shaking, and the plurality of stepped screws 32 serve to prevent the load of the subrack 5 (including the weight of the printed board 6).
support. Therefore, with the subrack 5 maintaining its original shape regardless of the distortion of the main rack 1,
It can be stuck to.

[Effect of idea]

As explained above, the present invention allows the main rack and sub-rack to be made small and lightweight, and even if the main rack is distorted, there is no problem in inserting and removing printed boards and attaching and detaching the front plate. It has excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of essential parts of one embodiment of the present invention;
Figure a is a sectional view of essential parts of one embodiment of the present invention, Figure 2 b
Figure 3 is a plan view, Figure 3 is a perspective view of a conventional rack, Figure 4 is a perspective view of a conventional rack.
The figure is a perspective view of essential parts of a conventional device. In the figure, 1 is the main rack, 2 is the side frame, and 5 is the main rack.
is the subrack, 6 is the printed board, 7 is the side plate, 8 is the screw hole, 10 and 20 are the mounting brackets, 11 and 21 are the subrack side mounting plate parts, 12 and 22 are the main rack side mounting plate parts, and 13 and 23 are the lengths. Holes, 14, 15, 24 are mounting screws, 25 is a fixing screw hole, 26 is a stepped screw hole, 29 is a fixing screw, 32 is a stepped screw, 32a
indicate the stepped portions.

Claims (1)

[Scope of utility model registration request] When fixing a box-shaped sub-rack made of a thin plate with an open front to a gate-shaped main rack via mounting brackets that are angled in plan view, The rack-side mounting plate is provided with horizontally long long holes through which the necks of mounting screws pass freely, corresponding to the parallel screw holes in the side frame, and the mounting plate is fixed to the side plate of the sub-rack. The mounting plate on the subrack side of the metal fittings has a plurality of stepped screw holes arranged in parallel vertically symmetrically around the center fixing screw hole, corresponding to the parallel screw holes on the side plate, and the height of the stepped portion is The gap between the step part of the stepped screw whose thickness is greater than the plate thickness of the mounting bracket and the stepped screw hole is smaller than the gap between the fixing screw and the fixing screw hole. Subrack mounting structure featuring.