JPH0445206Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to rotating electrical parts such as rotating volumes and rotary switches.

[Prior Art] In general, rotating electrical parts such as rotating volumes and rotary switches have an electrical circuit formed on a substrate, a slider provided in sliding contact with the circuit, and the slider used as an operating member. By rotating this operating member, the resistance value can be changed or the switch can be changed. In order to protect this electric circuit and slider,
A casing is mounted on a substrate, an electric circuit is located inside the casing, a slider is housed, and an operating member for rotating the slider is attached so as to protrude from the casing to the outside. There is.
The casing usually has a top plate part and a peripheral wall part formed by bending a metal plate, and a leg piece for mounting is provided in a row at the lower end of the peripheral wall part, and the leg piece is held on the base plate. The casing is configured to be attached to the board by bending the casing in such a manner as to cause the casing to bend.

In the rotary electric component configured as described above, it is necessary to provide a stopper portion that restricts the operating member to rotate between the maximum position and the minimum position. In this way, in order to regulate the rotational position of the operating member, a stopper forming wall is formed in a part of the peripheral wall of the casing and continues from the top plate toward the peripheral wall, and the height of the stopper forming wall is A stopper portion is formed by forming a pair of cut portions in the direction, a portion between the cut portions is bent inward, and an engaging portion that engages with the stopper portion is formed on the operating member. The configuration has been known for a long time.

[Problems to be solved by the invention] By the way, due to constraints on the shape of the casing, the width of the stopper forming wall is relatively short, and in such cases, the width of the stopper forming wall is relatively short. When an excessive force is applied to the stopper portion by operating the operating member with excessive force, the stopper forming wall bulges outward, causing the stopper portion to engage with the engaging portion of the operating member. There was a drawback that the stopper could no longer function as a stopper because it could no longer be engaged.

The present invention has been developed in view of the above points, and by reinforcing the stopper forming wall in the peripheral wall of the casing that is attached to the base plate, it is possible to avoid repeated operations of the operating member and to avoid excessive stress on the operating member. It is an object of the present invention to provide a rotating electric component in which the stopper forming wall is not deformed even when a force is applied thereto.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the rotary electric component according to the present invention has a stopper forming wall that is a part of the peripheral wall of the casing, and has a continuous portion with the top plate. It is characterized by having a configuration in which a convergent portion is formed at both ends of the tube to curve inward.

[Function] By providing the constricted portions at both ends of the continuous portion of the stopper forming wall to the top plate portion as described above, even if this stopper forming wall is formed narrowly, the constricted portions can be The stopper forming wall does not deform even if a large force is applied to the stopper, and the stopper can always be maintained in a state where it can be engaged with the operating member. It becomes like this.

Here, the aforementioned drawn portion can be formed by bending the stopper forming wall portion and then drawing along both end portions thereof. In this case, if a slight cut is made along the bending line at both ends of the stopper-forming wall connected to the top plate, the bending position can be positioned well. At the same time, it becomes possible to form the constricted portion easily.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, in FIG. 1, reference numeral 1 denotes a substrate on which an electric circuit 1a is formed by means such as a printed wiring pattern, and a slider 2 is installed on the substrate 1 to make sliding contact with the electric circuit 1a. There is. An operating member 3 for rotating the slider 2 from the outside is connected to the slider 2. A casing 4 is attached to the substrate 1 to protect the electric circuit 1a and the slider 2.

The casing 4 is made of a metal plate, as shown in FIG. It has a peripheral wall part 6 connected to each side, and the peripheral wall part 6 includes left and right side walls 6a, 6b and a proximal end wall 6c, and each of the side walls 6a, 6b has a wrap-around part 61a, 61b toward the distal end side. is formed, and a stopper forming wall 6d connected to the top plate portion 5 is formed at a portion between the wrap-around portions 61a and 61b of each of the side walls 6a and 6b. Furthermore, leg pieces 7a and 7b are connected to the side walls 6a and 6b, respectively.
a, 6b and the proximal wall 6c, and the side wall 6
The wrap-around portions 61a, 61b of a, 6b are bent toward the tip side, the stopper forming wall 6d is bent, and the leg pieces 7a, 7b are placed on the board 1.
The casing 4 can be attached to the substrate 1 by bending the casing 4 so as to hold the casing 4.

Furthermore, notches 8a and 8b are cut in the stopper forming wall 6d in the vertical direction, and by bending the portion between the notches 8a and 8b inward, the operation member 3 can be engaged. A stopper portion 9 is formed to engage with the mating portion 3a. Further, the stopper forming wall 6d has a top plate portion 5 at both ends thereof.
As shown in FIG. 3, the part below the notches 10, 10 provided in the continuous part with the drawing part 1 is curved inward by drawing processing.
1 and 11 are formed, and the stopper forming wall 6d is reinforced by the constricted portion 11.

This embodiment is constructed as described above, and its operation will be explained in the case where this rotary electric component is used as a rotary volume.

In this case, the electric circuit 1a formed on the substrate 1 consists of a resistor and a current collector, and the resistor and the current collector are formed in an arc shape, with the slider 2 spanning between them. It is located in By rotating the operating member 3 from outside the casing 4, the slider 2 is slidably displaced on the resistor and the current collector, and as a result, there is a gap between the resistor and the current collector. The resistance value at starts to change.

When the operating member 3 is rotated, the operating member 3 is rotated in order to position the maximum and minimum positions of the resistance value that changes due to the sliding of the slider 2 on the electric circuit 1a. is provided with an engaging portion 3a, and the casing 4 is provided with a stopper portion 9, so that when the operating member 3 is operated,
In the state where the resistance value is maximum and the state where it is minimum, the operating member 3 is restricted from being rotated any further.

Here, when operating the operating member 3, an unreasonable force is applied to the engaging portion 3a of the operating member 3 in a state in which the engaging portion 3a of the operating member 3 is engaged with the stopper portion 9 of the casing 4. When the stopper portion 3a is pressed against the stopper portion 9, the operating force acts on the stopper forming wall 6d of the casing 4 on which the stopper portion 9 is formed. Thereby, the stopper part 9 is deformed so as to be turned up in the direction away from the engaging part 3a, centering on the continuous portion between the stopper forming wall 6d and the top plate part 5. However, a constricted portion 11 is formed in the continuous portion between the stopper forming wall 6d and the top plate portion 5, and the constricted portion 11 is connected to the aforementioned stopper forming wall 6.
Since the stopper forming wall 6d serves as a reinforcement against the deformation of d and has improved rigidity, the stopper forming wall 6d does not actually undergo deformation. Therefore, the positioning function of the operating member 3 at the maximum resistance value and the minimum resistance value by the aforementioned stopper portion 9 and the engaging portion 3a can always be maintained in a good state.

Here, the drawn portion 11 of the stopper forming wall 6d is bent along the notch 10 in the continuous portion between the stopper forming wall 6d and the top plate portion 5, and then drawn at both left and right ends thereof. In this case, by providing the cut portion 10, the bent portion of the stopper forming wall 6d can be positioned well, and the aperture can be The constricted portion 11 can be formed smoothly and favorably by processing.

In the above-mentioned embodiment, the rotary electric component was described as being used as a rotary volume, but the rotary electric component is not limited to this, and can be used as a rotary switch, for example. Further, although the constricted portion 11 is provided along the entire length of the stopper forming wall 6d in the vertical direction, the point is that the stopper forming wall 6d
It is only necessary that it is formed in the continuous portion with the top plate part 5 at both ends of d, and it is not necessarily necessary to form it in the entire length thereof. Furthermore, the notch 10 allows for good positioning of the bent portion of the stopper forming wall 6d.
Although it is provided in order to smoothly form the constricted portion, the constricted portion 1 can be formed without forming the cut portion 10.
1, it is not necessary to form this notch 10.

[Effects of the invention] As detailed above, in the rotary electric component according to the invention, since the constriction part is formed in the stopper forming wall of the casing, even if excessive force is repeatedly applied to the operating member, it will not deform. The stopper portion formed on the stopper forming wall can maintain a state in which it can engage with the engaging portion of the operating member and exhibit its stopper function.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a rotating electric component showing an embodiment of the present invention, Fig. 2 is an exploded view of the casing, and Fig. 3
The figure is an enlarged perspective view of the main parts of the casing in an assembled state. DESCRIPTION OF SYMBOLS 1... Board, 1a... Electric circuit, 2... Slider, 3... Operating member, 3a... Engaging part, 4... Casing, 5... Top plate part, 6... Peripheral wall part, 6d …
...Stopper forming wall, 9...Stopper portion, 10...
Depth of cut, 11... Drawing part.

Claims (1)

[Scope of utility model registration request] By bending a metal plate, a casing consisting of a polygonal top plate and a plurality of surrounding walls bent at approximately right angles and hanging down from the sides of the top plate is formed, and the casing is connected to an electric circuit. A slider that slides on the electric circuit is housed in the casing, and an operating member for rotating the slider is connected to the slider. In a rotary electric component in which a part of the member protrudes outward from the top plate part of the casing, a part of the peripheral wall part of the casing is formed as a stopper forming wall continuous with the top plate part, and the stopper forming wall has the above-mentioned parts. A stopper concave portion for regulating the rotational position of the operating member by contacting the operating member is formed inwardly, and the aperture is curved inwardly at both ends of a portion of the stopper forming wall that is connected to the top plate portion. A rotating electrical component characterized by forming a part.