JPH0547515Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a package fall-off prevention device that prevents a package inserted into an electronic circuit unit frame from falling off in a communication device or the like.

(Prior Art) Conventionally, as shown in FIG. 2, in a package fall-off prevention device for preventing a package 3 inserted through a front opening 2 of an electronic circuit unit frame (hereinafter referred to as a unit frame) 1 from falling off, the above-mentioned device is used. Screw holes 4a are provided near the lower end of each front plate 4 located on both sides of the unit frame 1, and screw insertion holes 5a are provided near both sides of the elongated plate-shaped holding metal fitting 5.
A device for preventing a package from coming off is known, in which a package is attached to the unit 1 with a screw 6.

(Problems to be Solved by the Invention) In the conventional package removal prevention device, a plurality of packages 3 are held down by one presser metal fitting 5, so when only a predetermined package 3 is extracted or when an extension is installed, etc. When inserting a new package 3, the entire presser fitting 5 must be attached and removed each time, which poses the problem of complicating maintenance, inspection, and repair work for the package 3. was. Furthermore, since the holding fitting 5 was removed during this repair work, there was a risk that other packages 3 would slip out of the unit frame 1 in the event of an earthquake or the like. Furthermore, although an indicator lamp, a switch, a measuring terminal, etc. (not shown) are generally arranged on the front opening 2 side of the unit frame 1 in the package 3, it is necessary to make the presser metal fitting 5 strong. There was a problem in that the dimensions of the metal fittings 5 became large, and the design constraints on the arrangement of the indicator lamps and the like increased.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a package fall prevention device that prevents each package from falling off from an electronic circuit unit frame and allows only desired packages to be pulled out.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a package fall prevention device that prevents a plurality of packages inserted through the front opening of an electronic circuit unit frame from falling off. A fulcrum is provided near the front end of the package, and a rotation regulating means for regulating a rotation range along a rotation locus centered on the fulcrum is provided closer to the rear end, and the lock piece is pivotally supported at the upper part of the front end of the package. and a locking piece provided on the periphery of the upper frame of the electronic circuit unit frame, and the upper side of the locking piece contacts the lower end of the locking piece during insertion of the package, and It is characterized in that the upper side is formed to be detached from the locked piece after insertion is completed.

(Function) According to this device, when each package is inserted into the electronic circuit unit frame, the upper edge of the locking piece comes into contact with the locked piece of the electronic circuit unit frame during the insertion,
The rear end of the locking piece is restricted from rotating downward. When the insertion is completed, the contact state between the upper side and the locked piece is released, and the rear end of the locking piece rotates downward.
Even if a force is applied in the direction to pull out the package, the front end of the locking piece collides with the locked piece, and the package does not fall off. When pulling out the package, the front end of the locking piece is rotated downward to release the locked state and then pulled out.

(Embodiment) FIGS. 1, 3 to 5 show an embodiment of the present invention, in which 10 is a unit frame, 20 is a package housed in the unit frame 10, and 30 is a package housed in the package 20. This is the attached locking piece.

The unit frame 10 is formed in the shape of a horizontally long box, and has a front opening 11 surrounded by a rectangular frame on the front side. Upper and lower frames 1 of the front opening 11
A plurality of package insertion grooves 14 are formed in the bottom plate 15 of the unit frame 10, and a package guide groove 16 corresponding to each package insertion groove 14 is formed in the bottom plate 15 of the unit frame 10. It is now possible to accommodate.

The package 20 is formed into a plate shape, has electronic components (not shown) mounted thereon, has a connector 21 on its rear end, and has the lock piece 3 on its upper front end.
0 is attached to each.

The lock piece 30 is generally formed into a generally oblong plate shape, and the upper side 31 is configured to be inclined toward the tip. A weighting piece 32 for increasing the weight on the rear end side is provided at the rear end of the lock piece 30, and a lock release lever 33 is provided at the lower part of the front end. Further, a round hole 34 is provided near the front end of the lock piece 30 from the center of gravity, and a long hole 35 extending along the rotation locus is provided near the rear end. The piece 30 is pivotally supported on the package 20, and a rotation regulating pin 37 is attached to the package 20 through the elongated hole 35. The elongated hole 35 and the rotation restriction pin 37 constitute rotation restriction means for the lock piece 30. Further, the lock piece 30 and the rotation regulating means constitute a lock mechanism.

According to this embodiment, before the package 20 is inserted into the unit frame 10, since the weight of the rear end side of the lock piece 30 is large, the third
As shown by the solid line in the figure, the rotation regulating pin 37 contacts the upper end side of the elongated hole 35 and regulates the counterclockwise rotation of the lock piece 30.

Next, the package 20 is placed in the unit frame 1.
0, insert the rear end of the package 20 into the package insertion groove 14, and then insert the unit frame 10 through the package guide groove 16.
You will be guided inside. The lower end of the upper frame 12 of the unit frame 10 comes into contact with the upper side 31 of the lock piece 30, and when the package 20 is pushed in, the lock is inserted as shown in the two-dot chain line in FIG. 3 and in FIG. The lock piece 30 rotates clockwise about the shaft pin 36 against the counterclockwise rotational force of the piece 30, and the lock piece 30 is guided into the unit frame 10 together with the package 20.

When the package 20 is housed in the unit frame 10, the contact between the upper side 31 of the lock piece 30 and the upper frame 12 is released. As a result, the lock piece 30 rotates counterclockwise again due to the weight balance, and the upper end of the lock piece 30 moves inside the upper frame 12 as shown by the solid line in FIG. Therefore, the package 2
Even if a force is applied in the pulling direction to 0, the lock piece 30
The front end of the upper frame 12 will not collide with the upper frame 12 and fall off. That is, the upper frame 12 constitutes a locked piece of the package 20.

Further, when pulling out a predetermined package 20 for maintenance, inspection, or repair of the package 20, the lock release lever 33 of the lock piece 30 is pressed.
Press down and rotate the lock piece 30 clockwise. Then, the front end of the lock piece 30 is positioned below the lower end of the upper frame 12, and the package 20 is pulled out.

(Effects of the invention) As explained above, according to the invention, the lock pieces of each package are individually locked to the locked pieces of the electronic circuit unit frame, and the lock pieces are turned downward. When rotating, the desired electronic circuit package can be pulled out, which has the advantage that maintenance, inspection, or repair can be performed easily. In addition, unlike the conventional case, each package is not held down by a single holding metal fitting, so even if an earthquake or the like occurs during repair, there is no risk of other packages falling off the electronic circuit unit. has advantages.

[Brief explanation of the drawing]

Figures 1, 3 to 5 show an embodiment of the present invention. Figure 1 is an assembled perspective view of the package slip-off prevention device according to the present invention, and Figure 2 is a conventional package drop-off prevention device. Third assembled perspective view showing the device
4 is an abbreviated sectional view showing the operation of the locking piece, FIG. 4 is a sectional view taken in the direction of the - line arrow in FIG. 3, and FIG. 5 is an abbreviated sectional view showing the state of the locking piece during the package insertion operation. In the figure, 10...electronic circuit unit frame, 11...
Front opening, 12... Locked piece (upper frame), 20...
...Package, 30...Lock piece, 31...Top side.

Claims (1)

[Claims for Utility Model Registration] In a package dropout prevention device for preventing a plurality of packages inserted through the front opening of an electronic circuit unit frame from falling off, a locking mechanism in which the locking piece is pivotally supported on the upper front end of the package, and a locking mechanism that is provided with a rotational restriction means that restricts the rotational range along a rotational locus centered on a fulcrum, and the electronic circuit unit frame; and a locking piece provided on the periphery of the upper frame, the upper side of the locking piece touches the lower end of the locking piece during insertion of the package, and after the insertion of the package is completed, the upper side is separated from the locking piece. A device for preventing package cages from coming off, characterized by being formed so that they can be removed.