JPH0241900Y2 - - Google Patents

Description

[Detailed description of the invention] A. Technical field of the invention The invention provides an extension board drop prevention device, in particular, which prevents the extension board from falling off when a board used for printed wiring and an extension board for testing are vertically connected. It is not only reliably prevented, but also easy to handle.
The present invention also relates to an extension board fall prevention device having a structure such that no protrusions remain on both boards when the extension board is removed.

B. Prior art As electronic devices become smaller, the printed wiring boards on which electronic components are mounted are arranged vertically and the distance between the boards is made as short as possible in order to increase the density of mounting on the equipment. Placed. When testing the operation of each board that is densely packed in this way, an extension printed board, or extension board, is connected to the board being tested via a printed circuit board connector. Since the board is arranged vertically, it is not possible to hold the extension board with just the connector for the printed circuit board, so it is necessary to prevent the extension board from falling off by using some kind of fall prevention device between the board and the extension board. was going there.

C. Problems with the Prior Art As a conventional means of preventing the board and the extension board from falling off, holes are made at the upper and lower ends of the board and the extension board, respectively, and a drop-prevention plate is applied to the board and the extension board. A tightening tool such as a screw or a nut is used in the hole drilled in the extension board to prevent the extension board from falling off. For this reason, fasteners such as screws and nuts must be installed and removed using holes drilled in the board or extension board, which is cumbersome. In addition, even if you do not remove the screws and nuts tightening one side, for example, the extension board side, the fall prevention plate remains as a protrusion on the board side,
This protrusion becomes a hindrance. In the reverse case as well, protrusions remain on the extension board side, resulting in the disadvantage that the screws and nuts must be completely removed from the board and extension board.

D. Purpose of the invention The purpose of this invention is to solve the above-mentioned drawbacks, and it is possible to prevent the extension board from falling off using parts with a simple structure, and to prevent protrusions from remaining on either the board or the extension board. To provide an extension board drop-off prevention device in which a drop-off prevention device can be stored without any problems and the device can be easily handled.

E. Structure of the Invention In order to achieve the above object, the extension board drop-off prevention device of the present invention is an extension board drop-off prevention device that prevents the extension board from falling off when the extension board is attached to the board. a shaft support hole provided at a predetermined position on either the substrate or the extension board; a U-shaped stopper that is pivotally supported in the shaft support hole; and a U-shaped stopper that is inserted through the shaft support hole and that A clamping tool for tightening, and a U-shaped stopper that is rotatably supported on the edge portions of the board and the extension board with the extension board attached to the board, on the board side and the extension board side. A mechanism for preventing the extension board from falling off has a notch for preventing the U-shaped stopper from falling off and a notch for storing the U-shaped stopper, which are provided at positions where the U-shaped portions at the tips of the U-shaped stops come into contact when the U-shaped stopper is rotated. and a U-shaped stopper storage mechanism. An embodiment of the present invention will be described below with reference to the drawings.

F. Example of the invention Fig. 1 is an explanatory external view of the extension board fall prevention device according to the invention, Fig. 2 is a partially enlarged view for explaining the usage state of the invention, and Fig. 3 is a top view of Fig. 2. figure,
FIG. 4 shows a storage state explanatory view for explaining the state in which the U-shaped stopper is stored.

In Figure 1, a board 1 installed in an electronic device
A notch portion 2 is provided at the end side. A notch 4 is also provided on the edge of the extension board 3 to be combined with the board 1.
is provided, and furthermore, a shaft support hole (not shown) is bored. A U-shaped stopper 5 is rotatably supported in the shaft support hole. A connector 6 is provided on the extension board 3 side, and the board 1 and the extension board 3 are electrically connected via the connector 6. When the board 1 and the extension board 3 are mechanically connected via the connector 6, the pressing force of the connector 6 alone causes a rotational moment around point C due to the weight of the extension board 3 arranged vertically. acts and falls off. Particularly when vibrations are applied, the extension board 3 is more likely to fall off. So board 1
The board 1 and the extension board 3 are fixed by a notch 2 provided in the extension board 3 and a U-shaped stopper 5 rotatably supported on the extension board 3 to prevent the extension board from falling off. It is.

Now, if the distance between the pivot point A of the U-shaped stopper 5 rotatably supported on the extension board 3 and its tip B is L as shown in FIG. The distance between the provided notches 2 and 4 and the pivot point A of the U-shaped stopper 5 is equal to the above-mentioned distance L, that is, each notch is located at a position on the trajectory drawn by the tip B of the U-shaped stopper 5. 2 and 4 are provided.

Notch 2 in which a U-shaped stopper 5 is provided in the substrate 1
FIGS. 2 and 3 show the extension board 3 inserted into the board 1 and fixed to the board 1.

2 and 3, the U-shaped stopper 5 is rotated toward the substrate 1, and the tip B of the U-shaped stopper 5 is attached to the substrate 1.
It is inserted into the notch 2 bored in the. When fixing the board 1 and the extension board 3, slightly loosen the thumbscrew 7 and nut 8 that pivotally support the U-shaped stopper 5, and move the U-shaped stopper 5 in the direction of the arrow shown in FIG. , Tighten the thumbscrew 7 after making sure that the groove surface of the notch 2 and the inner surface of the U-shaped stopper 5 are in contact with each other.
Fix both. As a result, due to the extension board 1's own weight, a rotational moment is generated around the point C shown in FIG. is prevented from falling off.

When removing the extension board 3 from the board 1, the thumbscrew 7 is loosened, the U-shaped stopper 5 is rotated toward the notch 4 formed in the extension board 3, and the extension board 3 is pulled out from the connector 6. At this time, as shown in FIG. 4, the tip B of the U-shaped stopper 5 is inserted into the notch 4 made in the extension board 3, and the end B of the U-shaped stopper 5 is inserted into the notch 4 made in the extension board 3. is stored. Then, tighten the thumbscrew 7 to fix the U-shaped stopper 5 to the extension board 3. Note that even if the thumbscrews 7 are not necessarily tightened, the extension board 3 tends to rotate about the point C, so the board 1 can be supported. If there is vibration, it is safer to tighten the thumbscrew 7.

In the above description, the U-shaped stopper 5 rotatably supported on the extension board 3 is installed, but it can also be installed on the board 1 side.

Further, the above-mentioned U-shaped fasteners 5 can be provided at two locations, one above the other, and in this case, the extension board 3 can be fixed to the board 1 even more robustly.

In Fig. 3, the U-shaped stopper 5 is tightened with the thumbscrew 7 and the nut 8, but instead of the nut 8, cut a female thread into the U-shaped stopper 5 and tighten it with the thumbscrew 7. If you do this, handling will be even easier.

G. Effects of the invention As explained above, according to the invention, the structure is simple with simple parts, the small shape sufficiently exhibits the function of preventing falling off, and the handling is extremely easy. When the extension board is not used, there is no protrusion from the end surface when both the board and the extension board are stored, making it easy to downsize the electronic device.

Furthermore, when vibrations are applied to the electronic device, if the U-shaped stopper is tightened with a thumbscrew, the generation of vibration noise from the U-shaped stopper can be prevented.

[Brief explanation of the drawing]

Fig. 1 is an explanatory external view of the extension board fall prevention device according to the present invention, Fig. 2 is a partially enlarged view for explaining the usage state of the present invention, Fig. 3 is a top view of Fig. 2,
FIG. 4 is an explanatory view of a stored state in which the U-shaped stopper is stored. 1... Board, 2... Notch, 3... Extension board, 4... Notch, 5... U-shaped stopper, 6...
Connector, 7... Thumbscrew, 8... Nut.

Claims (1)

[Scope of utility model registration request] An extension board drop-off prevention device for preventing the extension board from falling off when the extension board is attached to the board, the shaft support hole being provided at a predetermined position on either the board or the extension board; a U-shaped stopper pivotally supported in the hole; a fastener inserted into the pivot hole and tightening the U-shaped stopper; an end portion of the board and the extension board, the extension board being attached to the board; When the U-shaped stopper, which is rotatably supported on the shaft, is rotated toward the board side and the extension board side while the U-shaped stopper is attached, the U-shaped portions at the tips of the U-shaped fasteners come into contact with each other. What is claimed is: 1. A device for preventing extension boards from falling off, characterized in that the extension board has respective notches for preventing falling off and for accommodating a U-shaped stopper, and is equipped with a mechanism for preventing extension boards from falling off and a mechanism for accommodating a U-shaped stopper.