JP2508599B2 - High frequency filter adjustment mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency filter adjusting mechanism, and more particularly to a fixing mechanism for adjusting screws for adjusting the electrical characteristics of a high frequency filter.

[0002]

2. Description of the Related Art Conventionally, as a fixing mechanism of this type of adjusting screw, there is, for example, a "position detecting sensor fine adjustment mechanism" described in Japanese Utility Model Laid-Open No. 2-50610. This position detecting sensor fine adjustment mechanism has a holder for mounting a position detecting sensor at the center of a threaded cylindrical rod, a base into which the holder is inserted, and a holder screwed into the holder to move the holder in the inserting direction. It is configured to include a nut, a fixing plate that fixes the nut to the base, and a spring that applies a preload between the holder and the nut.

With this arrangement, the position detecting sensor fine adjustment mechanism fixes the holder by fixing the holder by constantly applying tension to the holder and the nut by the spring, so that there is no displacement.

Next, a conventional high frequency filter adjusting mechanism will be described with reference to the drawings. FIG. 2 is a cross-sectional view showing a conventional high frequency filter. In FIG. 2, the conventional high-frequency filter adjusting mechanism is screwed into a screw portion 12 to be provided in the housing 11 of the high-frequency filter, and has a groove portion in the head portion so that the amount of protrusion into the housing 11 can be changed by rotation. Adjusting screw 13, a nut 14 that engages with the adjusting screw 13 and engages with the housing 11 to prevent the adjusting screw 13 from rotating, and an adjusting screw 13 that engages with the groove of the head of the adjusting screw 13 And a bit (screwdriver) 15 for rotating.

In the conventional high-frequency filter adjusting mechanism, when adjusting the electric characteristics of the high-frequency filter so as to be within a predetermined standard value, the bit 15 is used to engage with the groove of the adjusting screw 13 to rotate the housing. Adjustment is performed while varying the amount of protrusion into the body 11. Then, when the adjustment of the protrusion amount is completed, the nut 14 is screwed onto the adjustment screw 13 and tightened and fixed to the housing 11 so that the adjustment screw 13 does not rotate due to vibration or impact.

[0006]

The above-mentioned former has a drawback that the structure is complicated and the number of parts is increased. Also, in the latter high-frequency filter adjustment mechanism, when the adjustment screw is fixed to the housing and tightened with a nut when the adjustment is completed, the adjustment screw moves into the housing due to the play between the adjustment screw and the female thread portion of the housing. However, there is a drawback that the amount of protrusion changes and the adjustment value deviates from the standard.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an adjusting screw which is screwed to a screw portion for being mounted on a housing and which varies the amount of protrusion into the housing, and an adjusting screw which is screwed to the adjusting screw. A nut for stopping, a washer with a spring for preventing the nut from loosening, a nut driver having a tubular shape and attached to the nut for rotating, and a head of the adjusting screw inserted into the nut driver and A bit that engages a portion to rotate the adjusting screw, and an elastic member that is inserted into the inside of the nut driver and that maintains a constant gap between the bit and the nut driver are provided.

[0008]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an outline of an embodiment of the present invention, FIG. 1 (a) is a perspective view for explaining an adjusting method of a high frequency filter adjusting mechanism of the present invention, and FIG. 1 (b) is the same. Figure (a)
1C is a sectional view showing the configuration of the adjusting jig,
FIG. 1D is a front view of FIG.

The high frequency filter adjusting mechanism of the present invention is shown in FIG.
As shown in FIG. 3, the high frequency filter side is screwed into the screw portion 2 to be provided in the housing 1 of the high frequency filter, and has a groove portion in the head portion so that the electrical characteristics can be changed by the amount of protrusion inside the housing 1. The adjusting screw 3 includes a adjusting screw 3, a nut 4 that engages with the adjusting screw 3 to lock the adjusting screw 3, and a spring washer 5 that is attached to the adjusting screw 3 to prevent the nut 4 from loosening.
As an adjusting jig for adjusting the amount of protrusion by rotating the adjusting screw 3, a nut driver 7 having a tubular shape and fitted to the nut 4 and rotating, and an adjusting screw in a state of being inserted into the nut driver 7 3 includes a bit 6 that engages with the groove portion of 3 and rotates the adjusting screw 3, and an elastic member 8 that is inserted into the nut driver 7 and that maintains a constant gap between the bit 6 and the nut driver 7. To be done.

As shown in FIGS. 1 (a) and 1 (b), the high-frequency filter adjusting mechanism adjusts the electric characteristics by the amount of protrusion of the screw portion 2 into the housing 1 to be provided in the housing 1. The adjusting screw 3 is screwed. The adjusting screw 3 is fixed by a nut 4 via a washer 5 with a spring so that the adjusting screw 3 does not loosen and the amount of protrusion does not change.

The nut driver 7 is shown in FIG. 1 (c) and FIG.
As shown in (d), the nut 4 can be rotated by fitting into the outer shape of the nut 4 (for example, a hexagon).
In addition, an elastic member 8 having a hole in the center thereof is inserted and attached inside the nut driver 7. The material of the elastic member 8 may be synthetic rubber or the like, for example. And bit 6
Is a cylindrical nut driver 7 with the elastic member 8 penetrating the hole.
The bit 6 and the nut driver 7 can be rotated independently of each other by being inserted into the inside of the.

Next, the adjusting method of this embodiment will be described.

When adjusting the amount of protrusion of the adjusting screw 3,
First, the nut washer 7 is fitted into the nut 4, and the nut 4 is slightly rotated (the direction in which the nut 4 approaches the housing 1), whereby the spring washer 5 is compressed, and the housing 1 of the housing 1 has been mounted so far. The force acting on the adjusting screw 3 can be canceled by the screw portion 2 and the nut 4. In this state,
As shown in (b), the tip of the bit 6 is engaged with a groove provided in the head of the adjusting screw 3 and rotated, and the protrusion amount is adjusted so that the electrical characteristics fall within a predetermined standard value.

When the adjustment of the protrusion amount is completed, the bit 6 and the nut driver 7 are separated from the adjusting screw 3 and the nut 4.
Then, due to the repulsive force of the spring washer 5, a force is generated in a direction in which the nut 4 and the housing 1 are separated from each other, so that the adjusting screw 3 exerts an axial force from the female screw portion 2 of the housing 1 and the nut 4. receive. That is, the adjusting screw 3 is held by receiving a force that prevents the adjusting screw 3 from rotating. As a result, the amount of protrusion of the adjusting screw 3 caused when the nut 4 is tightened is prevented from changing due to the looseness between the adjusting screw 3 and the female screw portion 2 of the housing 1.

[0016]

As described above, in the high-frequency filter adjusting mechanism of the present invention, the repulsive force of the spring washer constantly pushes the adjusting screw in the axial direction through the nut. Therefore, when tightening the adjusting screw with the nut, It is possible to prevent the amount of protrusion from changing due to backlash between the adjusting screw and the female screw portion. This has the effect of suppressing changes in the electrical characteristics of the high-frequency filter to a minimum with a simple configuration.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 1,11 Housing 2,12 Female thread 3,13 Adjustment screw 4,14 Nut 5 Washer with spring 6,15 Bit 7 Nut turning 8 Elastic member

Claims (1)

(57) [Claims] 1. An adjusting screw which is screwed to a screw portion for being provided on a housing and which varies a protrusion amount into the housing, a nut which is screwed to the adjusting screw and locks the adjusting screw, A washer with a spring that prevents the nut from loosening, a nut driver that is tubular and is attached to the nut to rotate, and a nut washer that is inserted into the nut driver and engages with the head of the adjusting screw. A high-frequency filter adjusting mechanism comprising: a bit for rotating a screw; and an elastic member that is inserted into the nut driver and that holds a constant gap between the bit and the nut driver.