JPH0236313Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a case structure for an electric circuit device, and an object of the present invention is to make it easier to remove the case cover of a shield case from a rectangular frame, and to maintain a sufficient engagement state.

As a conventional example, referring to the external perspective view of an electric circuit device shown in FIG. The pushing spring 2 elastically engages with a band-like protrusion 4 on the side surface of the square frame 3, so that the flat plate part of the case lid 1 covers the entire opening of the square frame 3 without any gaps. Ta. Therefore, the case lid 1 has to be removed by hand, but it has the disadvantage that it is difficult to remove because the bent portions of the plurality of pressing springs 2 are elastically engaged with the band-like protrusion 4. .

The present invention eliminates the above drawbacks and will be described below with reference to the drawings.

2A and 2B are an external perspective view of a shield case of an electric circuit device showing an embodiment of the present invention, and an exploded plan view of the case lid of the shield case.

The case lid 5 of the shield case has flat plate-shaped pressing springs 7 and 8 that are bent along a bending line 6 and formed into a plurality of tongues at the peripheral end, and the intermediate portion of the pressing spring 8 is has a fitting hole 8a. Further, a corner portion of the flat plate portion 5a surrounded by the bending line 6 has a notch 9.

A rectangular frame 10 of the shield case has a band-like protrusion 11 and a protrusion 12 provided on the peripheral side surface so that a part of the side surface protrudes.

The case lid 5 and the square frame-shaped frame 10 are assembled by elastically abutting the pressing spring 7 of the case lid 5 against the band-shaped protrusion 11 of the square frame-shaped frame 10, and by opening the fitting hole of the pressing spring 8. By fitting the protrusion 8a into the protrusion 12, a configuration is completed in which it is placed over the defined positions of the top and bottom openings of the square frame 10, respectively.

According to the above-described configuration, when removing the case lid 5 from the square frame 10, a Phillips screwdriver can be inserted into the shield case through the notch 9 of the case lid 5 and the Phillips screwdriver can be removed without using the hands as in the conventional example. Lift up the case lid 5 using the lever principle by placing a part of the screwdriver on the upper corner edge 13 as a fulcrum, or simply insert a flat head screwdriver and turn it to lift the case lid 5 and easily square it. The case lid 5 can be removed from the frame 10. In addition, by providing the notches 9 at the corners of the case lid 5, it is possible to eliminate the dangerous right angle part during work, and when lifting the case lid 5 with a screwdriver, the corner upper end 13 of the rectangular frame is Because it serves as a fulcrum, it is mechanically stronger than the upper end of the side made of other single plates.

Further, the pressing springs 7 and 8 provided at the peripheral edge of the case lid 5 are flat plate-shaped, bent only once at the bending line 6, unlike the pressing spring 2 of the conventional example which is bent twice. Since the pressing springs 7 and 8 are formed, it is possible to process the rectangular frame 10 to have the designed inner dimensions with respect to the outer dimensions. In addition, the case lid 5 is fixed in a predetermined position by fitting the fitting hole 8a and the protrusion 12, and the case lid 5 is elastically abutted by the pushing spring 7 and the band-like protrusion 11. Since the lid 5 and the rectangular frame 10 are electrically and mechanically integrated and are only in elastic contact with each other, a fitting hole 8a is provided and a locking spring 8 is used.
It can be easily removed by disengaging the . As described above, according to the present invention, the case lid has a notch at its corner so that a tool such as a screwdriver can enter and exit the shield case through the notch, and a flat plate-shaped part is provided at the peripheral edge of the case lid. It has a plurality of pushing springs bent in the shape of a corner, and the corner pushing springs have a fitting hole in the middle, and the square frame has a strip-shaped frame at the edge of the peripheral side. It has a protrusion and a protrusion so that the fitting hole of the pushing spring and the protruding part of the rectangular frame are fitted and locked, and the other pushing springs are configured to elastically abut against the band-like protruding part. The case lid can be easily removed by simply disengaging the fitting hole from the protrusion using a screwdriver while maintaining sufficient engagement with the square frame.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a shielding case of a conventional electric circuit device, and FIGS. 2A and 2B are external perspective views of a shielding case of an electric circuit device of an embodiment of the present invention, and a developed plan view of the case lid. 1, 5, 15...Case lid, 2, 7, 8, 14
...Press spring, 3,10...Square frame,
4, 11...band-shaped protrusion, 6...bending line, 9
...Notch.

Claims (1)

[Scope of utility model registration request] In a case structure of an electric circuit device in which a shield case is constituted by a square frame-shaped frame and a case lid that covers a closed part of the square frame-shaped frame, the case lid has a notch at its corner and a cutout at its peripheral edge. The square frame has a plurality of pressing springs bent into a flat plate shape in the section, and among the pressing springs, the corner pressing springs have a fitting hole formed in the middle thereof, and the square frame-like frame has: It has a band-shaped protrusion and a protrusion on the edge of the peripheral side surface, and the fitting hole of the pressing spring and the projection of the square frame are fitted and locked, and the other pressing spring is A case structure for an electric circuit device, characterized in that the case structure is configured to come into elastic contact with the band-shaped protrusion.