JPH043487Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention applies a retaining process to the upper end of a column protruding from an insulating base, and press-fits an insulating trimmer base from the top of this retaining member. This invention relates to a variable capacitor in which an insulating base and an insulating trimmer base are fixed.

Conventional technology Conventional variable capacitors have pillars with threaded upper ends protruding from the four corners of a resin base, and the holes in the insulating trimmer base are inserted to align with the tops of the pillars to protrude above the insulating trimmer base. I fixed the trimmer base to the base by tightening the nut on the screw in the support of the part.

Problems that the invention aims to solve In the conventional trimmer base tightening structure, as mentioned above, the trimmer base was fixed to the base by tightening nuts on each support.
It had the disadvantage that it took time to tighten the nuts because each nut had to be used individually.

Means for Solving the Problems The present invention eliminates the use of four nuts when fixing the trimmer base to the base, and instead inserts the hole drilled in the trimmer base into the upper end of the column protruding from the base. The structure is such that the base, stator, and rotor can be assembled by simply press-fitting the trimmer base applied to the upper end of the strut into a retaining part to prevent it from slipping off to the upper end of the strut.

Function The present invention is configured as described above, so that the nut is omitted and when the trimmer base is press-fitted into the strut of the base, the strut and the trimmer base are firmly connected by the self-righting action of the trimmer base.

Embodiment To explain a conventional variable capacitor with reference to FIGS. 1 and 2, struts 1a and 1b protrude from the front left and right of an insulating base A, and struts 1c and 1d protrude from the rear left and right of the insulating base A. Each pillar has 1
Attach screws 1a', 1 to the tips of a, 1b, 1c, and 1d.
b', 1c', and 1d' are engraved, respectively. Reference numeral 3 designates an insulating trimmer base, which has insertion holes 3a, 3b, 3c, and 3d formed on its front, rear, left, and right sides, respectively, into which screws 1a', 1b', 1c', and 1d' are loosely inserted. Fix the stators 5a and 5b, 6a and 6b with the struts 1a and 1c and struts 1b and 1d, respectively, and tighten the upper ends of each strut 1a, 1b, 1c, and 1d to screws 1a', 1b', 1c', and 1d' with nuts. 2a, 2b, 2
c and 2d are screwed onto the trimmer base 3, respectively. Therefore, in the conventional variable capacitor, four nuts must be screwed to each of the four stator columns, which requires a large number of parts, increases the number of assembly steps, and has poor workability.

3, 4, 5, 6 and 7 show the variable capacitor of the present invention. 10 is a rectangular insulating base, 11a and 11b are pillars projecting through the front left and right sides of the insulating base 10, and 11c and 11d.
11a', 11b', 11c', and 11d' are formed by rolling or other means at the tips of the columns 11a, 11b, 11c, and 11d, respectively. 12 is a rectangular insulating trimmer base, 13a, 13b, 13c, 13d is a locking part 11a', 11b', 11c', 11d' of the pillars 11a, 11b, 11c, 11d. This is an insertion hole that has a diameter slightly smaller than the outer diameter of the retaining portions 11a', 11b', 11c', and 11d', and is an insertion hole for the trimmer base 12 that is inserted into the struts 11a, 11b, 11c, and 11d from above. 13a,1
3b, 13c, and 13d are press-fitted to tightly fix the trimmer base 12 to the base 10.
In the figure, 14 and 14' are stators fixed to the columns 11a and 11c, and 15 and 15' are the stators fixed to the columns 11b and 11c.
Stator fixed to d, 16 and 17 are pillars 1
A connection plate 1 electrically connects 1a and stator 14, and supports 11b and stator 15, respectively.
8 and 18' are rotors; 19 is a rotor shaft supported between the base 10 and the trimmer base 12;
0 indicates a stator conduction tube inserted through each of the pillars 11a, 11b, 11c, and 11d.

Effects of the invention As mentioned above, the present invention forms a retaining part at the upper end of the column that protrudes from the base, and press-fits this retaining part into the insertion hole drilled in the trimmer base to connect the base, trimmer base, and stator. As a result, the number of parts can be reduced and the number of assembly steps can be reduced compared to the conventional method, thereby improving workability and shortening the standard working time, among other practical effects.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of a conventional variable capacitor, Fig. 2 is a rear view of the same as above, Fig. 3 is a partially cutaway front view of the present invention, Fig. 4 is a rear view of the same as above, Fig. 5 6 is an enlarged front view with a part of the support column cut away, FIG. 6 is a sectional view taken along line 5-5 in FIG. 5, and FIG. 7 is an enlarged front view with a part of the trimmer base cut away. 10...Base, 11a, 11b, 11c, 1
1d... Support, 11a', 11b', 11c', 11
d'...Prop retaining part, 12...Trimmer base, 13a, 13b, 13c, 13d...Prop insertion hole, 14, 14', 15, 15'...Stator, 18, 18'...Rotor , 19...rotor shaft.

Claims (1)

[Scope of utility model registration request] Consisting of a strut that protrudes from the base and has a retaining part formed at its tip, and a trimmer base that has an insertion hole that is press-fitted into the retaining part of the strut. A variable condenser that fixes the base and trimmer base by press-fitting the insertion hole of the trimmer base into the part.