JPH0831700B2 - Printed board dropout prevention device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for housing a printed board in an electronic device or the like, and more particularly to a device for preventing the printed board supported by a guide rail from falling off.

[0002]

2. Description of the Related Art Printed boards mounted on electronic devices are
In order to improve the workability of maintenance and inspection, it was necessary to easily attach and detach. Therefore, the mounting of the printed board on the electronic device or the like is generally performed by housing the printed board in a shelf in the electronic device. The printed board is stored in the shelf by inserting the edge of the printed board into a horizontal groove provided in a guide rail on the inner wall of the shelf and supporting the printed board with the guide rail. With such a storage method, the printed board can be freely attached and detached, but on the other hand, there is a problem in that the printed board is easily moved due to external vibration or the like, and the printed board is dropped from the horizontal groove of the guide rail.

Therefore, as one of the conventional methods for supporting and accommodating a printed board so as not to fall off the guide rail,
As shown in FIG. 3, a leaf spring 7 is provided above and below the inner wall of the horizontal groove 2 of the guide rail 1, and the leaf spring 7 clamps the printed board 5 to fix it. Further, as disclosed in Japanese Utility Model Laid-Open No. 63-49291, a protrusion having a chevron cross section is provided along the insertion direction in the guide plate insertion path (horizontal groove) of the guide rail, and the protrusion is pressed against the printed board. A printed board storage case (shelf) that supports it has also been proposed (see FIG. 4).

Further, as shown in Japanese Utility Model Laid-Open No. 61-86992, printing is performed by a fixing member which is arranged at one end side of the guide rail and has a groove which is slidable in a direction orthogonal to the arrangement direction of the guide rail. A fixing structure of a printed board for fixing the board has been proposed.

Furthermore, as disclosed in Japanese Patent Laid-Open No. 3-99494, a nut body is provided in the shelf, and a female screw provided at the center of the nut body is screwed with a male screw of a bolt attached to a printed board. Therefore, a mechanism for fixing the printed board to the shelf has been proposed.

[0006]

However, in the above-mentioned conventional method of fixing the printed board by pinching it with the leaf spring and the printed board storage case described in Japanese Utility Model Laid-Open No. 63-49291, Since the printed board is only pressed and supported from above and below, it can be prevented from falling off against vertical force, but effectively prevented from falling off when horizontal force is applied to the printed board. It was difficult to do.

Further, in the printed board fixing structure described in Japanese Utility Model Laid-Open No. 61-86992, it is necessary to provide a fixing member and a sliding member for the fixing member on the shelf, so that the apparatus becomes large in size, heavy in weight and high in height. There was a problem of leading to cost reduction. Moreover, since this printed board fixing structure fixes all the printed boards housed in the shelf at the same time by one fixing member, even if any one of the printed boards is attached or detached, the fixing member is required each time. All the printed boards had to be unlocked by sliding.

Further, in the mechanism for fixing the printed board to the shelf described in JP-A-3-99494, the printed board is directly screwed and fixed to the shelf. Since it had to be fixed and released, there was a problem that workability was significantly impaired.

The present invention has been proposed in order to solve the problems of each of the above conventional techniques, and has a simple, lightweight, and compact structure, and reliably supports the printed boards in the shelf. , It is an object of the present invention to provide a device for preventing the printed board from falling off, which can be fixed and detached.

[0010]

In order to achieve this object, the present invention relates to a device for supporting a printed board by a horizontal groove provided on an inner wall of a guide rail, in which springs are provided above and below the inner wall of the horizontal groove. A steel ball that is loosely attached is provided, and at the position corresponding to the steel ball on the printed board,
The structure is such that a stopper hole with which a steel ball is engaged is provided.

[0011]

According to the device for preventing the printed board from falling off, the steel ball engages with the stopper hole by the elastic force of the compression spring, so that the printed board is securely supported and fixed on the guide rail . The printed board can be easily attached and detached by rotating the steel balls.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a printed board dropout prevention device according to the present invention will be described in detail below with reference to the drawings. FIG.
FIG. 2 is a sectional view of an essential part showing an embodiment of a device for preventing the printed board from falling out according to the present invention, and FIG. In these figures, 1 and 1 are guide rails, which are usually provided in a pair of rails in a state of facing each other in the horizontal direction of the inner wall of the shelf. Horizontal grooves 2 and 2 into which the printed board 5 is inserted and supported are provided in the inner horizontal directions of the guide rails 1 and 1 facing each other, as will be described later. Reference numeral 3 denotes a stopper, which is provided inside the horizontal grooves 2 and 2 so as to face vertically in the vertical direction. The stopper 3 has a built-in compression spring 4 and a steel ball 5 rotatably attached to the compression spring 4. The sphere 5 has an opening 6 in which the ball 5 can appear and disappear.

The opening 3 has a diameter slightly smaller than the diameter of the steel ball 5. As the spring 4 constituting the stopper 3, a leaf spring or the like can be used in addition to the compression spring in the embodiment .

Further, the stopper 3 is provided at least one place at any position of the horizontal grooves 2 and 2, but in order to securely support and fix the printed board 7, a plurality of places, for example, FIG. As shown in FIG.
It is preferable to provide them at two places in the middle. Reference numeral 7 denotes a printed board that is inserted into and supported by the horizontal grooves 2 and 2, and has a stopper hole 8 that is sized to be screwed into the steel ball 5. The stopper hole 8 is formed by the guide rails 1 of the printed board 7.
It is provided at a position where it is screwed into the steel ball 5 when the insertion into 1 is completed.

The device for preventing the printed board from falling off according to the present invention having such a structure is used as follows. That is, when the printed board 7 is first housed, the edges of the housed printed board 7 are set to the horizontal grooves 2 and 2 of the guide rails 1 and 1.
Insert it according to and push it horizontally to store. When the printed board 7 is stored, the steel balls 5 and the stopper holes 8 provided at the corresponding positions are engaged with each other. As a result, the printed board 7 is pressed by the elastic force of the compression spring 4 and held by the fitting of the steel ball 5 and the stopper hole 8, so that a force due to vibration is applied in both vertical and horizontal directions. Also, without moving easily,
Does not fall off the horizontal grooves 2 and 2. Also, using the steel ball 5
Then, when the printed board 7 is inserted into the horizontal groove 2, the steel ball 5
Rotates to smoothen the movement of the printed board 7.

Next, when taking out the printed board 7,
Hold the end of the printed board 7 that is stored and pull it horizontally in the reverse direction of insertion. Printed board 7 by compression spring 4
The clamping pressure of the steel ball 5 is strong enough to correspond to the force due to vibration and the like, and since the steel ball 5 is rotatable, the steel ball 5 and the stopper hole 8 can be pulled by a certain amount of force.
The printed board 7 can be easily taken out. The device for preventing the printed board from falling off according to the present invention,
In addition to the above, it also has a function as a positioning means when the printed board is stored.

[0017]

As described above, according to the present invention, the pudding plate in the shelf can be surely supported and fixed and can be freely attached and detached by the simple, lightweight and compact structure.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a device for preventing a printed board from falling off according to the present invention.

FIG. 2 is a plan view of an essential part showing an embodiment of a device for preventing a printed board from falling off according to the present invention.

FIG. 3 is a cross-sectional view of essential parts showing a conventional printed board storage mechanism.

FIG. 4 is a perspective view of a main part of a conventional printed board storage mechanism.

[Explanation of symbols]

 1 Guide rail 2 Horizontal groove 3 Stop part 4 Spring 5 Steel ball 6 Opening 7 Printed board 8 Stopper hole 9 Leaf spring

Claims (1)

[Claims] 1. An apparatus for supporting a printed board by a horizontal groove provided on an inner side wall of a guide rail, wherein steel balls loosely attached to springs are provided above and below the inner wall of the horizontal groove, and the above-mentioned printed board is provided with the steel ball. falling-off prevention device of a printed board, characterized in that a stopper hole for engagement of the steel ball in a position corresponding to the steel ball.