JPH0429596Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Summary] This is a printed board holding metal fitting that is configured so that printed board holding metal fittings of the same standard are screwed on the top and bottom of the printed board using screws at asymmetric positions, thereby making parts common. and improve workability.

[Field of Industrial Application] The present invention relates to a metal that holds down a large number of printed boards that are easily mounted.More specifically, it relates to a printed board holding bracket that aims to standardize parts by improving the hole shape. be.

2. Description of the Related Art A printed board mounted on a computer or the like is held down by a printed board presser to maintain good electrical connection while the computer or the like is in operation.

BACKGROUND OF THE INVENTION For maintenance or system changes, a printed circuit board mounted on a computer or the like is often removed or inserted.

Therefore, the printed board presser must be easily attachable and detachable by the operator.

Therefore, a hole is provided in the metal fitting, a screw on the rack side is passed through the hole, and the printed board holding metal fitting can be attached and detached by tightening or loosening the screw.

Printed board holding metal fittings are usually attached to the top and bottom of a printed board, so they need to be excellent in workability and economy.

[Prior Art] Conventionally, as a printed board holding fitting, for example, as shown in FIG. 3, a printed board holding fitting 1 made of flat metal or L-shaped metal and extending from side to side,
It consists of a screw hole 2 drilled near the center in the longitudinal direction.

The hole 2 in the conventional example consists of a large diameter portion 5 through which the screw head 4 of a screw 3 for screwing passes, and a small diameter portion 6 communicating with the large diameter portion 5.

FIG. 4 shows the printed board presser 1 in use.

In FIG. 4, a pedestal 11 of a rack 10 is provided with a large number of vertically opposed rails 12, into which a printed board 13 can be inserted and mounted.

The screws 3 are attached to the front surface of the pedestal 11 at positions slightly above the upper rail 12 and slightly below the lower rail 12 so as to be able to be tightened and loosened.

In order to distinguish these screws 3 from each other, the upper screw is designated by 3-A, and the lower screw is designated by 3-B.

Further, the printed board presser metal fittings 1 to be attached to the respective screws 3-A and 3-B are also designated with -A or -B for differentiation.

In order to attach the printed board holder 1-A to the upper screw 3-A with the printed board 13 mounted on each rail 12 of the rack 10, the hole 2 of the printed board holder 1 must be inserted into the screw 3. The screw 3 is placed in the small diameter portion 6 of the hole 2 by passing through the diameter portion 5 and then moving the printed board holding bracket 1-A downward, and the screw 3 is tightened to fix the screw.

Since a part of the printed board holding metal fitting 1-A hangs over the top of each printed board 13 at this position, the printed board holding metal fitting 1-A holds the printed board 1
It is fixed in the state where 3 is pressed.

Attach the printed board holding bracket 1- to the lower screw 3-B.
To attach B, it is sufficient to perform a work that is vertically symmetrical to the work described above for the upper printed board holding bracket 1-A.

To remove the upper printed board holding bracket 1-A, loosen the screw 3-A, shift the printed board holding fitting 1-A upward, and insert the screw 3-A into hole 2.
Print board holding bracket 1 so as to pull it out from the large diameter part 5.
-Remove A.

In order to remove the lower printed board holding fitting 1-B, it is sufficient to perform an operation that is vertically symmetrical to the work described above for the upper printed board holding fitting 1-A.

FIGS. 5 and 6 show the state in which both the printed board presser fittings 1-A and 1-B are removed in this manner.

In this state, the extraction tool 14 is used to insert or remove any printed board 13.

The extraction tool 14 has a handle 15, a pin 17 that can engage with a small hole 16 provided near the end of the printed board 13, and a notch 18 provided in the base 11 corresponding to each printed board 13. It consists of a protrusion 19 that can be engaged.

To pull out the printed board 13, place the same standard pulling tools 14 on the upper left side and lower right side of the printed board 13, insert the protrusions 19 of each pulling tool 14 into the notches 18 of the rack 10, and then pull out the printed board 13. The pin 17 of the tool 14 is inserted into the small hole 16 of the printed board 13, and the printed board 13 is pulled out while tilting the handle 15 as shown by the arrow 20 in FIG.

Next, the drawbacks of such a conventional structure will be explained.

In the printed board mounting structure to which the conventional structure is applied, even when the printed board holding brackets 1-A and 1-B are removed, the screws 3-A and 3-B are easily attached.
0, so screws 3-A, 3
-B is installed in the position where the extraction tool 14 and each screw 3-A,
It is required that the position be such that interference with 3-B can be avoided.

That is, the positions of the screws 3-A and 3-B are restricted by the relationship with the mounting position of each printed board 13.

However, the mounting position of the printed circuit board 13 in the rack 10 may be changed based on changes in the system.

In particular, when the total number of printed circuit boards 13 mounted on the rack 1 changes, each rail 12 is installed at a different pitch determined for each number of printed circuit boards 13.
Accordingly, the printed circuit board 13 will be mounted at different pitches.

Moreover, since each pitch is specified in inches, changing the pitch will cause the printed board to
3, the mounting position is changed by a fraction.

Therefore, the positions of the screws 3-A and 3-B are also affected by the above-mentioned fraction of the position of the printed board 13.
Usually, the positions are off from the center lines 21-A, 21-B (FIG. 4) of the printed board presser fittings 1-A, 1-B.

Furthermore, when there is a printed board 13 that cannot be held down by the printed board holding fittings 1-A, 1-B, interference of the printed board holding fittings 1-A, 1-B with the printed board 13 or other parts, etc. In order to avoid this, the extension area of the printed board presser fittings 1-A, 1-B with respect to the rack 10 is often limited.

As a result, the upper printed board holding bracket 1-A
The position and the position of the lower printed board presser metal fitting 1-B are not point symmetrical.

In this way, printed board holding metal fittings 1-A, 1-
Based on the asymmetry of B and the center deviation of the screws 3-A and 3-B, the upper printed board holding bracket 1
- Distance La from the right end of A to hole 2-A or screw 3-A and lower printed board holding bracket 1-B
Distance from the left end of hole 2-B or screw 3-B
It is usually different from Lb.

Therefore, the printed board holding fitting 1-A and the printed board holding fitting 1-B have asymmetrical shapes.

Therefore, it is not possible to use upper and lower printed board presser metal fittings 1 of the same standard.

Therefore, the number of parts increases, resulting in poor economic efficiency and ease of parts management.

In addition, since the parts are not interchangeable in this way, when the printed board holding fittings 1-A and 1-B are removed in order to insert or remove the printed board 13,
The two types of metal fittings are stored separately, and when installing the printed board holding metal fittings 1-A and 1-B, there is a need to select from two types of metal fittings, which results in poor workability.
There is a high risk of incorrect installation.

[Problems to be Solved by the Invention] This conventional method has problems in that the printed board holding brackets are not compatible, resulting in poor workability and economy, and the possibility of incorrect installation.

The present invention was created in view of these points, and provides a printed board holding metal fitting that improves work efficiency and reduces costs by making printed board holding metal fittings compatible, and also prevents incorrect installation. is intended to provide.

[Means for Solving the Problems] The printed board presser of the present invention has a hole provided in the metal fitting that communicates with the large diameter portion that allows the screw head of the fixing screw to pass through. It consists of two small diameter parts.

The positions of each of these small diameter parts are the positions corresponding to the screws when the printed board holding bracket is attached to one end of the printed board, for example, the top end, and
This is the position corresponding to the screw when the printed board presser is attached to the other end of the printed board, for example, to the lower end.

[Function] In the printed board presser of the present invention, one of the two small diameter portions is located at a position corresponding to the screw when the printed board presser is attached to one end of the printed board.

Therefore, on the one end side of the printed board, after passing the screw head of the screw through the large diameter part of the hole in the printed board holding bracket, move the printed board holding bracket so that the screw is in the small diameter part of the one end. Then, while holding one end of the printed board with the printed board holding metal fitting, tighten the screws.

Further, the other of the two small diameter portions is located at a position corresponding to a screw when the printed board presser is attached to the other end of the printed board.

Therefore, on the other end side of the printed board, after passing the screw head of the screw through the large diameter part of the hole in the printed board holding bracket, insert the printed board holding bracket so that the screw comes to the other small diameter part. Move the printed board, hold the other end of the printed board with the printed board holding metal fitting, and tighten the screws.

In this way, printed board presser metal fittings of the same standard can be used at either end of the printed board.

Therefore, even if the positions of the screws at both ends of the printed board are not symmetrical, the parts can be unified and an increase in the number of parts can be suppressed.

Furthermore, when installing printed board holding metal fittings, there is no need to select and check the specifications that match the screw positions, which improves work efficiency and prevents incorrect installation.

[Example] Figures 1 and 2 are examples of the present invention,
FIG. 1 is a front view of a printed board presser 1 according to an embodiment.

The hole 2 of this printed board holding fixture 1 has a large diameter portion 5 and two small diameter portions 6.

The large diameter portion 5 has a size that allows the screw head 4 of the screw 3 to pass therethrough, and depending on the arrangement of the small diameter portion 6, it can have a laterally elongated shape.

The distance from the right end of the printed board holding fixture 1 to the two small diameter portions 6 is equal to the distances La and Lb to the screws 3-A and 3-B described based on FIG. 4.

FIG. 2 shows how the printed board presser 1 of the embodiment is used.

In FIG. 2, the distance L from the right end of the upper and lower printed board holding brackets 1 to the hole 2 is constant, and one of the two small diameter parts 6 can be selected and screwed. By using the upper and lower printed board holding brackets vertically symmetrically, it is possible to standardize them, and to avoid interference with the printed board and to cope with asymmetry in screw position due to changes in the pitch of the printed board, etc.

Therefore, it is possible to reduce costs and improve workability.

[Effects of the invention] As described above, according to the invention, it has a simple structure, and even when the screw positions are not point-symmetrical with respect to the center, the printed board holding bracket can be shared, and the work can be easily performed. It is possible to improve performance and economy and prevent incorrect attachment, and is extremely useful in practical terms.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a front view showing the use state of the embodiment, Fig. 3 is a front view of the conventional structure, and Fig. 4 is a front view showing the use state of the conventional structure. 5 is a front view showing the printed board in a pulled out state, and FIG. 6 is a sectional view showing the printed board in a pulled out state at a position corresponding to the - line in FIG. 4. In Figures 1 and 2, 1 is a printed board holding bracket, 2 is a screw hole, 3 is a screw, 4 is a screw head of screw 3, 5 is a large diameter part of hole 2, and 6 is a hole for fixing a screw. There are two small diameter parts, 10 is a rack and 13 is a printed board.

Claims (1)

[Scope of Claim for Utility Model Registration] When operating a large number of printed boards 13 mounted on the rack 10, the printed board presser 1 holds the printed boards 13 near both ends thereof.
is fixed with a screw 3 passed through the hole 2 of the printed board holder 1, and the printed board 13 is
In a printed board holding bracket that is designed to remove the printed board holding fitting 1 by loosening the screw 2 when inserting or removing the screw, the hole 2 has a large diameter portion 5 that allows the screw head 4 of the screw 3 to pass through.
and two small-diameter parts 6 communicating with the large-diameter part 5, and each of the two small-diameter parts 6 holds the printed board holding fitting 1 against the printed board 13.
The position corresponding to the screw 3 when attached to one end side, and the position corresponding to the screw 3 when the printed board holding bracket 1 is attached to the printed board 13.
A printed board holding fixture characterized in that it is located at a position corresponding to the screw 3 when attached to the other end side.