JPS6233375Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thread hanging type dial device, and particularly relates to an improvement in the method of fixing the thread.

A conventional string-type dial device used in radios and the like is constructed as shown in FIG. 1, for example.
In FIG. 1, a dial knob, guide rollers 3 and 4, and a dial drum 5 are provided on a base plate 1, and a thread 7 with a pointer 6 attached therebetween is stretched as shown. The dial drum 5 is coaxially fixed to the tip of the shaft of a variable capacitor (not shown) by a screw 8. Also, both ends of the thread 7 are
It is tied to a rib or the like provided on the dial drum 5, and a knot 9 is made to fix it.

According to the above configuration, by turning the dial knob 2, the thread 7 is pulled, and the dial drum 5 is rotated via the guide rollers 4 and 5, whereby the variable capacitor that is interlocked with the dial drum 5 is rotated. At the same time, the pointer 6 moves to indicate the dial scale (not shown).

In such a conventional dial device, both ends of the thread 7 are fixed to the dial drum 5 as described above. In the example shown in Fig. 1, the thread 7 is tied to a rib etc. formed on the dial drum 5, but other methods include, for example, providing a hole in the flange of the dial drum and passing the thread 7 through the hole to make a knot. is commonly practiced. In either method, the thread 7 is tied to the dial drum 5 after the thread 7 is strung along a predetermined route. For this reason, especially in the case of small radios, etc., the dial drum 5 is also small, making the work extremely difficult and requiring considerable skill and time.

The present invention has been developed in view of the above-mentioned circumstances, and embodiments of the present invention will be described below with reference to the drawings.

Figure 2 shows the dial drum 2 applied to the present invention.
An example of 0 is shown below.

The dial drum 20 has a pair of flanges 10,
11 is provided, and the flanges 10 and 11 portions and the cylindrical boss portion 12 form a pair of arm portions 24 and 2.
5. The boss portion 12 is provided with a screw insertion hole 13, and a groove 14 having a substantially semicircular cross section is provided on the upper surface of the boss portion 12.
It is provided in the vicinity of and in the chordal direction of the boss portion 12. Further, a pair of ribs 15 are provided on the sides of the boss portion 12,
16 is provided to protrude in a direction parallel to the groove 14. Further, a notch 17 is provided in a part of the flange 10.

FIG. 3 shows an embodiment of the present invention in which the dial drum 20 shown in FIG. 2 is applied to the dial device shown in FIG. 1, and FIG. 4 shows an attachment structure of the dial drum 20 shown in FIG. An example is shown. In FIGS. 3 and 4, the same parts as in FIGS. 1 and 2 are given the same reference numerals.

In FIG. 3, the thread 7 led from the shaft of the dial knob 2 is wound around the circumferential surface of the dial drum 20 for approximately half a circumference, then introduced inside through the notch 17, passed under the rib 16, and then passed through the lower side of the rib 16. , is fitted into the groove 14. In this case, the diameter of the thread 7 is, for example, 0.3
When mm, the diameter or width of the groove 14 is, for example, 0.2
~0.25 mm, which is selected to be smaller than the diameter of thread 7. As a result, the thread 7 is elastically fitted into the groove 14.
As shown in FIG.
It is held down from above by the head 8a of the screw 8 for attaching to. The thread 7a is thereby fixed in the groove 14. In FIG. 4, 21 is a variable capacitor, 19a is a screw hole provided in the variable capacitor shaft 19, and 22 is a recess into which the tip of the variable capacitor shaft 19 is inserted. Next, the thread 7 led out from the groove 14 passes under the rib 15. At this time, one end of the thread 7 and one end of the tension adjusting spring spring 25 are tied through a knot 23, and the one end of the spring 25 passes under the rib 15. After the other end of the spring 25 and the other end of the thread 7 are tied together via the knot 24, this thread 7 intersects with the thread 7 introduced from the notch 17.
It is further wound around the remaining half circumferential surface of the dial drum 20. Then, it passes through guide rollers 3 and 4, returns to the shaft of dial knob 2, and is wound around this shaft.

To attach the thread 7, first, prepare and set the thread 7 in which both ends are tied to the spring 25 via the knots 23 and 24 to form a loop. Next, the tip of the variable capacitor shaft 19 is fitted into the recess 22 of the dial drum 20 to temporarily attach the dial drum 20. Next, after the thread 7 formed in the loop shape is stretched over the above-mentioned path, the screw 8 is inserted through the insertion hole 13 of the boss portion 12 and screwed into the screw hole 19a, and the dial drum 20 is attached to the variable condenser shaft 19.
Fixed to. At this time, the thread 7 fitted into the groove 14
a is also fixed by the head 8a of the screw 8. In this case, the knot 23 may be arranged at any position other than the position shown in FIG.
If it is arranged between one end and the rib 15 (or 16), when the thread 7 is pulled,
This knot 23 prevents the thread 7 from slipping. This allows the thread 7 to be fixed even more firmly.

As mentioned above, the present invention is based on the dial drum 2.
A boss portion 12 provided at the center of one side of 0;
A recess 22 that is provided on a side surface of the dial drum 20 opposite to the one side surface, facing the boss part 12, and into which the tip of the variable capacitor shaft 19 is fitted.
, a screw insertion hole 13 penetrating from the center of the boss portion 12 to the center of the recess 22, and the boss portion 1.
Groove 1 provided near the screw insertion hole 13 of No. 2
4, the dial drive thread 7 is fitted into the groove 14, and the screw 8 is inserted into the screw insertion hole 13, and the screw 8 is inserted into the variable capacitor shaft 19 fitted into the recess 22. The dial drum 20 is fixed to the variable converter shaft 19 by screwing it into the screw hole 19a provided on the tip end surface. This relates to a dial device characterized in that the position of the dial driving thread 7 is regulated by closing the fitted portion.

Therefore, according to the present invention, when crossing the thread,
Since it is possible to use a thread tied in a loop shape in advance, it is possible to omit the work of tying the thread to the dial drum after the thread has been strung together as in the past. Along with this, when fixing the thread, when screwing the dial dial drum to the variable condenser shaft, the head of the screw closes the part of the groove where the thread is fitted and regulates the position of this thread, so the assembly process of the new type of dial device can be greatly simplified.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a conventional dial device, FIG. 2 is a perspective view showing an embodiment of a dial drum applicable to the present invention, and FIG. 3 is a front view showing an embodiment of the present invention. FIG. 4 is a side sectional view showing an embodiment of the mounting structure for the dial drum. In addition, in the symbols used in the drawings, 7, 7a...
Thread, 12...Boss part, 13...Screw insertion hole, 14
. . . groove, 19 . . . variable capacitor shaft, 20 . . . dial drum.

Claims (1)

[Scope of Claim for Utility Model Registration] A boss provided at the center of one side of the dial drum, and a variable capacitor shaft provided on the opposite side of the dial drum to face the boss. a recess into which the tip of the dial is fitted; a screw insertion hole penetrating from the center of the boss to the center of the recess; and a groove provided in the boss near the screw insertion hole; By fitting the drive string into the groove, inserting a screw into the screw insertion hole, and screwing this screw into a screw hole provided on the tip surface of the variable cap shaft fitted into the recess, The dial drum is fixed to the variable condenser shaft, and at this time, the position of the dial driving thread is regulated by blocking the part of the groove where the dial driving thread is fitted with the head of the screw. A dial device characterized by: