JPS646594Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tuning device using a dial thread that is widely applied to radios, etc., and in particular, a dial spring locking device for keeping the dial thread under constant tension at all times. This relates to improvements to the mechanism.

The dial spring locking mechanism generally has a hook formed at one end of the dial spring so that the dial spring can be freely engaged and detached, and this hook can be locked in a proper position on the dial drum.

A conventional example of a dial spring locking mechanism is shown in FIG.

In the figure, a plurality of small holes 2 are usually bored in the dial drum main body 1, and one of these small holes that gives the optimum tension to the dial thread 3 is selected, and the small hole 2 is inserted into the dial drum body 1. A hook 5 formed at one end of the dial spring 4 is hooked. As is clear from the figure, the locking mechanism is simply such that the small hole 2 is hooked with the hook 5, and therefore the locking state must be maintained by relying on the tensile force of the spring 4. There is no structure.

However, such a conventional mechanism has a drawback that the hook 5 easily comes off from the small hole 2 when the dial thread is cut or the shape of the hook 5 is deformed. What is most undesirable is that the spring 4 becomes free when the hook 5 comes off, and as a result, the spring 4 comes into contact with various parts inside the device, causing damage to the parts and safety. It is causing an inconvenience that harms the person.

The purpose of this invention is to eliminate the above-mentioned drawbacks, and to provide a dial spring locking mechanism that allows the hook to be freely engaged and detached, but that prevents the hook from coming off even if the dial thread breaks.

Examples of this invention will be described below with reference to the drawings.

FIG. 2 shows a first embodiment of this invention, and FIG. 2 shows a vertical sectional view, a plan view, and a hook portion of the dial spring locking mechanism, respectively. Note that the same or corresponding parts as the locking mechanism shown in FIG. 1 are given the same reference numerals.

At a position corresponding to the small hole 2 of the dial drum body 1, a protruding piece 6 having a width smaller than the inner diameter of the hook 5 and another protruding piece 7 arranged opposite to this protruding piece 6 are provided. Projecting pieces 6, 7
The opposing tips of are in contact with each other. The protruding piece 6 and the other protruding piece 7 are both made of plastic resin integrally molded with the drum body 1, and their contact portions are the lower edge of the protruding piece 6 and the protruding piece 7.
Since the height of the protruding piece 7 is lower than that of the protruding piece 6 so as to form the upper edge, normally the protruding pieces 6 and 7 are in contact with each other, as shown in FIG. When the protrusion piece 7 is pressed downward with the tip of the hook 5, the protrusion piece 7 is bent to the position shown by the dotted line due to the elasticity of the resin. In this state, when the protruding piece 6 is passed inside the hook 5 and the spring 4 is pushed down in the direction of arrow A, the hook 5 is moved to the protruding piece 6, that is, the drum body 1.
At the same time, the other bent protruding piece 7 returns to its original position and the tips of both protruding pieces are brought into contact again. Therefore, in this locked state, even if the dial thread 3 breaks, the hook 5 will not come off from the protrusion 6 because the tips of both protrusions are in contact with each other. In this example, a protrusion 8 is provided on the lower surface of the protruding piece 6 to prevent the hook 5 from returning to the tips of both protruding pieces after locking, thereby making it possible to further ensure that the hook 5 is prevented from coming off. . Also, the first
In the conventional mechanism shown in the figure, it was necessary to make the hook shape into a hook shape, but in this example, there is no need to make it into such a shape.In fact, it is better to make it into an annular shape as shown in C in the same figure. This is desirable in order to prevent it from coming off in the lateral direction.

Next, a second embodiment of this invention is shown in FIG.
Figures A and B show a longitudinal sectional view and a plan view of each dial spring locking mechanism. Note that the same or corresponding parts as the locking mechanism shown in FIG. 2 are given the same reference numerals.

The main difference in structure from the mechanism shown in FIG. 2 is that in the example shown in FIG. In the example, this protruding piece 7 is provided upright on the drum body 1. The action for locking the hook 5 to the protruding piece 6 is the same as in the previous example, and is performed by bending the protruding piece 7 in the direction of arrow B and utilizing the gap created by this at the tips of both protruding pieces. Te, hook 5
This is done by passing the protruding piece 6 inside the. In this case, since the above-mentioned gap created by bending the protrusion piece 7 is small, the tips of both protrusion pieces are normally arranged to form a gap t smaller than the wire diameter of the hook 5, so that the protrusion When the piece 7 is pressed, the gap t is made to be slightly larger than the wire diameter of the top hook 5. In addition, in this example, the hook holder 9 is attached to the protruding piece 6, and the hook 5 is held in the locked state.
The position is regulated.

From the above structure, even in this embodiment, when the hook 5 is in the locked state, the hook 5 will not come off from the tip of the protruding piece 6, so even if the spring thread 3 breaks, the hook will remain intact. The locked state will be maintained.

FIG. 3 shows the arrangement position of the locking mechanism shown in the above two embodiments with respect to the drum body. As shown in the figure, the locking mechanism is constructed at appropriate positions 2 to 3 of the drum body 1, similar to the conventional mechanism,
The tension can be adjusted. Furthermore, the protruding pieces 6 and 7 are provided so that their longitudinal directions coincide with the extending directions of the dial thread 3 and the spring 4, so that they can be locked in the most appropriate direction.

Note that if you want to remove the hook 5, remove the protruding piece 7.
The hook 5 can be carried outside by bending the hook 5 and using the gap formed between the tips of both the protruding pieces 6 and 7. In other words, it can be released by performing an operation opposite to the operation at the time of locking.

As described above, according to this invention, troubles caused by dial thread breakage can be prevented with a simple structure, and the spring can be freely engaged and detached, making it a very useful locking device. It can be a mechanism.

[Brief explanation of the drawing]

FIG. 1A shows a dial drum body equipped with a conventional dial spring locking mechanism, and FIG. 1B shows a longitudinal sectional view of the locking mechanism. Also, Figure 2 A,
B and C respectively show a vertical cross-sectional view, a plan view, and a hook part of the dial spring locking mechanism which is the first embodiment of this invention, and FIGS. 3A and 3B respectively show the second embodiment of this invention. A vertical sectional view and a plan view of a certain dial spring locking mechanism are shown. Moreover, FIG. 4 shows the arrangement position of the locking mechanism according to the above two embodiments with respect to the drum body. 1...Dial body, 3...Dial thread, 4...
...Dial spring, 5...Hook, 6...Protrusion piece (first protrusion piece), 7...Protrusion piece (second protrusion piece).

Claims (1)

[Scope of Claim for Utility Model Registration] A dial spring locking mechanism for a tuning device in which a hook is formed at one end of a dial spring to which both ends of a dial string are tied, and this hook is locked to a dial drum. , a protruding piece having a width smaller than the inner diameter of the hook;
The dial drum is provided with another protruding piece made of an elastic material arranged opposite to this protruding piece, and
The dial spring is locked by making the distance between the opposed tips of these protruding pieces smaller than the wire diameter of the hook, and pressing the other protruding piece to pass the protruding piece inside the hook. A dial spring locking mechanism for a tuning device, which is characterized by: