JPS6311372Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screw fall prevention plate used for joining waveguide flanges in, for example, a wireless communication device.

Conventionally, this type of screw fall prevention mechanism has been used to weld bosses 2 provided with internal threads to the four corners of waveguide flange 1, as shown in FIG. And this boss 2
Then, the screw 3 was screwed together via a flat washer 4, a spring washer 5, etc. However, according to this mechanism, the bosses 2 must be welded to the four corners of the waveguide flange 1, which requires special processing and is expensive.
The drawback was that it could not be attached to a ready-made waveguide and lacked versatility.

This invention was made in view of the above drawbacks,
It has almost the same shape as a rectangular waveguide flange, has screw holes in the corners that correspond to the screw holes of the waveguide flange, and has a square hole in the center that is larger than the waveguide outer shape, and has a square hole in the center. A thin metal plate made of a leaf spring with a groove narrower than the waveguide outline formed on one side;
It consists of a waveguide tightening screw that is attached to the screw hole in the corner of this thin metal plate with a washer etc. so that it will not fall off, and it can be easily attached and removed without special processing on a ready-made waveguide flange. The purpose of the present invention is to provide a simple plate for preventing screws from falling off.

Hereinafter, the present invention will be explained based on FIGS. 2 and 3.

FIG. 2 shows a partially exploded perspective view of an embodiment of the screw fall prevention plate of the present invention, and FIG. 3 shows a perspective view of the screw fall prevention plate of the present invention attached to a waveguide. In this drawing, 1 is a rectangular waveguide flange, and 1a are screw holes provided at the four corners of the waveguide flange 1. Reference numeral 10 is a thin metal plate made of a leaf spring, which is formed in almost the same shape as the waveguide flange 1, and has screw holes 1 of the waveguide flange 1 in its four corners.
A screw hole 11 corresponding to a is provided, and a square hole 12 slightly larger than the outer shape of the waveguide is provided in the center of the screw hole 11.
is provided. A groove 13 narrower than the outer shape of the waveguide connecting the square hole 12 and the outside is formed in one side of the square hole 12. 7 is a tightening screw;
A male thread 7a is formed at the tip to engage with a female thread formed in a screw hole of a fitted flange (not shown) of the waveguide flange 1, and a shaft portion 7b is formed between the male thread 7a and the head. There is. This tightening screw 7 is
With the spring washer 8 fitted into the shaft portion 7b, it is inserted into the screw hole 11 of the metal plate 10, and then the E-shaped retaining ring 9 is fitted into the shaft portion 7b from the waveguide flange side of the metal plate 10.

Therefore, the tightening screw 7 is mounted by the E-shaped retaining ring 9 fitted into its head and shaft portion 7b so that it will not fall out of the screw hole 11 of the metal plate 10 even if it is rotated or the like. In addition, when attaching this metal plate 10 to a waveguide, as shown in FIG. is expanded and opened larger than the outer dimensions of the waveguide, so that it can be easily incorporated into the waveguide. Conversely, when the finger is released, the metal plate 10 returns to its original state due to the elasticity of the spring plate, and the groove 13 becomes smaller than the outer dimensions of the waveguide, so that it will not come off from the waveguide.

As described above, according to the present invention, there is no need to perform special processing on the waveguide flange, so it can be manufactured at low cost and can also be used for ready-made waveguides. Further, since the attachment and detachment can be carried out by a simple operation such as pushing open the metal plate with fingers, etc., it is highly versatile and has a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a partially exploded perspective view of a conventional screw fall prevention mechanism in a waveguide flange, FIG. 2 is a partially exploded perspective view of an embodiment of the screw fall prevention plate of the present invention, and FIG.
This figure is a perspective view of the screw fall prevention plate shown in FIG. 2 in an attached state. 1... Waveguide flange, 7... Tightening screw, 9
...E-type retaining ring, 10...Metal plate, 11...Screw hole, 12...Square hole, 13...Groove.

Claims (1)

[Scope of utility model registration request] It has almost the same shape as a rectangular waveguide flange,
A screw hole corresponding to the screw hole of the waveguide flange is provided in the corner, a square hole larger than the waveguide outline is provided in the center, and a groove narrower than the waveguide outline is provided on one side of the square hole. A screw drop-off prevention plate consisting of a thin metal plate made of a formed leaf spring and a tightening screw that is attached to a screw hole in a corner of the thin metal plate with a washer or the like to prevent the screw from falling off.