JPS6141205Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure of a dual-axis variable resistor that is small and inexpensive.

FIG. 1 shows a conventional concentric double-shaft variable resistor, which is installed in the upper and lower openings of a cylindrical housing 1 as shown in the figure, and has resistance layers 2' and 2' on its surface, respectively.
For the substrates 2 and 3 having 3′, one substrate 2
An outer shaft rotating body 7 and an inner shaft rotating body are fixed to respective tips of double operating shafts (outer shaft 5 and inner shaft 6) that penetrate through the center of the shaft and are supported concentrically by bearings 4. The sliders 9 and 10 attached to the slider 8 rotate and slide on the resistance layers 2' and 3', respectively, by rotating the outer shaft 5 or the inner shaft 6, thereby changing the resistance value.

In this case, since two substrates each having a resistive layer are required, the overall size becomes large, which is disadvantageous in terms of cost, number of component parts, and assembly man-hours.

Therefore, as in Utility Model Publication No. 39-28159,
It was considered to provide a resistance layer concentrically on two substrates, but since the two sliders were attached directly to the rotating shaft, the contact was unstable, and the rotational shaft and slider It was necessary to prepare parts according to the type, and assembly was complicated.

The present invention solves these drawbacks and provides a dual-shaft variable resistor that has a small number of parts and is easy to assemble.The details thereof will be described below.

Figures 2 and 3 show an embodiment of the dual-shaft variable resistor of the present invention. In the figures, 11 is a cylindrical cap-shaped housing, and the open end thereof has concentric rings arranged on its surface. A substrate 14 having two sets of resistive layers 12 and 13 is mounted. In addition, the housing 11
Dual operation shafts (outer shaft 16 and inner shaft 17) are fitted and supported concentrically in the bearing part 15 at the center of the bottom side of the Disc-shaped rotating bodies 18 and 19 are integrally formed. A slider 21 that slides on the inner resistance layer 13 is installed near the center of the rotating body 19 of the inner shaft 17, and an outer resistance layer 12 is mounted on the outside of the slider 21.
Insulating ring 2 equipped with a slider 20 that slides on the top
2 is held so that it can rotate freely with respect to the rotating body 19 of the inner shaft 17. An arm portion 25 protruding from the outer peripheral end of the stopper protrusion 24 of the rotating body 18 of the outer shaft 16 is engaged with the notch 23 of the insulating ring 22. The insulating ring 22 is configured to rotate in synchronization with the rotation of the insulating ring 22. Further, the arm portion 25 protruding from the outer peripheral end of the stopper projection 24 of the outer rotary body 18 passes slightly outside the outer periphery of the stopper projection 26 of the inner rotor 19 and engages with the insulating ring 22. Therefore, even if the outer shaft 16 and the inner shaft 17 are rotated separately, the arm portion 25 and the protrusion 2
6 is taken care not to hit.

The stopper projection 24 of the outer shaft rotor 18 and the stopper projection 26 of the inner shaft rotor 19 come into contact with a stopper projection 27 provided on the inner peripheral wall of the cylindrical cap-shaped housing 11,
They regulate the rotation angles of the outer shaft 16 and the inner shaft 17, respectively.

The above is the basic configuration of the present invention. The arm portion 25 protruding from the stopper protrusion 24 of the outer rotating body 18 is provided with elasticity by, for example, forming a vertical groove 28, and furthermore, the tip portion thereof is provided with elasticity as described above. By providing a pawl portion 29 that is slightly larger than the width of the notch 23 of the insulating ring 22 and elastically press-fitting the arm portion 25 into the notch 23, the connection between the two is ensured. There will be no more play between the 22s.

Further, as shown in FIG. 4, highly viscous grease 30 is injected and applied between the fitting portion of the outer shaft 16 and the inner shaft 17, and a protrusion 31 is provided on the inner shaft 17 (or outer shaft 16) and then press-fitted. , or as shown in FIG.
2, the rotational resistance force between the outer shaft 16 and the inner shaft 17 is transferred to the bearing part 1 at the center of the bottom surface of the outer shaft 16 and the housing 11.
By increasing the rotational resistance force between 5 and 5,
Even if the operating shaft of either the outer shaft 16 or the inner shaft 17 is rotated, both shafts rotate at the same time, and both the sliders 20 and 21 for the outer shaft 16 and the inner shaft 17 touch the resistance layer of the substrate 14. 12 and 13 at the same time to act as a double variable resistor, and the outer shaft 1
It is also possible to have both the shafts 6 and the inner shaft 17 and to shift their mutual relationship to form a friction-driven dual shaft variable resistor.

In FIG. 5, the inner shaft slider 21 is omitted, and in FIGS. 4 and 5, the arm portion 25 is
is omitted from the illustration.

The present invention is constructed as described above, and since it is composed of a single board with a resistive layer, it is smaller than conventional products, has fewer component parts, and requires less man-hours for assembly, making it cheaper. become. In addition, since two sets of resistance layers are printed on the same substrate surface, it is extremely practical, as it can minimize the interlocking error between the two sets of variable resistors operated by the outer and inner shafts. .

In addition, in this invention, the outer shaft slider is attached to an insulating ring, and the insulating ring is connected to the outer shaft rotating body. , parts management is very easy. Generally, in the case of a variable resistor, the outer shaft is often changed according to the user's request, and if the outer shaft slider is attached directly to the outer shaft, it is necessary to change the outer shaft according to the change of the outer shaft. However, if the slider for the outer shaft is attached to an insulating ring and the insulating ring is connected to the outer shaft rotating body, as in the present invention, Even if it is necessary to change the outer shaft according to the user's request, the slider for the outer shaft does not need to be changed.
This is because the outer shaft slider can be shared for different types of outer shafts. Moreover, in the present invention, the slider is not attached directly to the operating shaft, but is attached directly to the disk-shaped rotating body rotated by the operating shaft, or directly for the inner shaft, or via an insulating ring for the outer shaft. A slider is attached, and since the slider is supported by the disc-shaped rotating body and comes into contact with the resistor, a stable contact state with little wobbling can be obtained even against external shocks.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of a conventional dual-axis variable resistor, Fig. 2 is a side sectional view showing an embodiment of the dual-axis variable resistor according to the present invention, and Fig. 3 is an enlarged exploded perspective view of the same. 4 and 5 are exploded perspective views of essential parts showing other embodiments of the present invention, respectively. DESCRIPTION OF SYMBOLS 11...Cylindrical cap-shaped housing, 12...Outer peripheral side resistance layer, 13...Inner peripheral side resistance layer, 14...Substrate,
15...bearing part, 16...outer shaft, 17...inner shaft,
18... Outer shaft rotating body, 19... Inner shaft rotating body, 20
... Slider for outer shaft, 21 ... Slider for inner shaft, 22
...Insulation ring, 23...Notch, 24, 26...
... protrusion for stopper, 25 ... arm, 27 ... protrusion for stopper, 29 ... pawl, 30 ... grease, 32 ... spring.

Claims (1)

[Claims for Utility Model Registration] (1) A substrate having two sets of resistance layers arranged concentrically on the surface is attached to the open end of a cylindrical cap-like casing, and a concentric The heavy operating shafts are supported by bearings at the center of the bottom surface of the housing, and the inner shaft rotating body has a disc-shaped rotating body made of an insulating material that is rotated by each operating shaft. At the same time as installing a slider that slides into contact with the
A slider that slides on the outer resistance layer is attached to an insulating ring held so as to freely rotate outside of the inner resistance layer slider, and the outer rotating body is attached to the outer resistance layer. A dual shaft variable resistor configured such that an arm portion protruding from a portion engages with the insulating ring to rotate the insulating ring synchronously. (2) Due to the viscosity of the grease injected between the outer and inner shafts and the frictional force of the press-fit between the outer and inner shafts or the spring inserted between the outer and inner shafts, the The dual shaft variable resistor according to claim 1, wherein the rotational resistance force is greater than the rotational resistance force between the outer shaft and the bearing portion at the center of the bottom surface of the cap-like casing.