JPH043650B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the structure of a multiple variable resistor that can separately operate two or more sets of rotary variable resistors with one operating shaft, and particularly relates to The present invention provides a multiple variable resistor that is very advantageous in cases such as car audio sets that require many operating functions despite being a small set.

Conventional configurations and their problems The most typical device that uses multiple variable resistors, which are a combination of several single-function variable resistors, is car audio, and its general functions are volume adjustment and balance. Adjustments, sound quality adjustments, and opening/closing of the power switch are usually performed with the volume turned down to the minimum level.

Figure 1 shows an example of a rotary multiple variable resistor that is commonly used when trying to perform all of these functions with a single variable resistor. 2-set variable resistor is a 2-set variable resistor for volume adjustment, 1 is a power cut-off switch, and 1 is a single-acting variable resistor for balance adjustment. The double variable resistor for sound quality adjustment is rotatably driven by a hollow cylindrical outer shaft 2 rotatably supported by a bearing 1. Rotationally driven by.
The driving method is such that a serration gear 4 having a chevron-shaped knurling on the outer diameter is attached to the middle part of the inner shaft 3, and this gear 4 is normally installed in the center hole of the rotating body 5 of the variable resistor. It is biased by a cylindrical spring 7 so as to mesh with the inner peripheral gear 6. And the rotating body 5 of this variable resistor
has a stopper protrusion 22 on the outer periphery that engages with the protrusion 21 of the housing 20 to regulate the rotation angle of the variable resistor, and also has a cylindrical engagement part so as to rotate in conjunction with the rotating body 8 of the switch. They are connected by a joint 9.

Therefore, when the inner shaft 3 is rotated in this state, the rotating body 5 of the variable resistor rotates, and the sliders 10 and 11 rotate and slide on the resistance elements 12 and 13, thereby increasing the resistance of the variable resistor. As the value changes, the rotating body 8 of the rotary switch also rotates, and at the end of the rotation angle of the variable resistor, the protrusion 14 drives the movable contact 15 of the switch to switch the switch, and the end position is changed. When the outer peripheral protrusion 22 of the rotary body 5 of the variable resistor comes into contact with the protrusion 21 of the housing 20, the rotation of the rotary body 5 and the rotary body 8 of the switch is stopped.

Further, by pushing the inner shaft 3 against the biasing force of the spring 7, the serration gear 4 disengages from the inner gear 6 of the rotary body 5 of the variable resistor, and the rotary body 16 of the variable resistor inner gear 1
When the inner shaft 3 is rotated in this state (while applying a pushing force to the inner shaft 3), the rotating body 16 rotates, and the slider 18 rotates and slides on the resistance element 19 accordingly. The resistance value of the variable resistor changes. When the pressing force applied to the inner shaft 3 is removed, the serration gear 4 disengages from the inner gear 17 of the rotary body 16 of the variable resistor, and again engages the inner gear 6 of the rotary body 5 of the variable resistor. The structure is such that it returns to the engaged state.

In the case of this type of multiple variable resistor, the volume adjusting variable resistor operated by the inner shaft 3 and the power switch section operating synchronously are most frequently used in the normal state. The operating torque of the power switch, which is operated at the end of the rotation angle where the volume variable resistor is turned down to the lowest volume, is set several times larger than the rotation torque of the variable resistor, so when switching to the switch, The switching torque is applied via the cylindrical engagement portion 9 to the meshing portion between the serration gear 4 attached to the inner shaft 3 and the inner gear 6 of the rotary body 5 of the variable resistor.
A play angle (rotational wobbling) of the inner shaft 3 is likely to occur due to wear of this meshing gear portion.

Also, when operating the power switch, especially when turning off the switch, too much force is applied to the operating shaft 3, causing an accident in which the meshing part between the serration gear 4 and the inner gear 6 of the rotating body 5 is damaged. Something happened.

In addition, in order to prevent the above-mentioned damage and wear, it is possible to lengthen the meshing part between the serration gear 4 and the inner gear 6, but it is possible to make the variable resistor variable by meshing the inner gear 17 of the variable resistor with the serration gear 4. When driving a resistor, in order to release the serration gear from the inner gear 6 of the variable resistor, it is necessary to increase the distance between the variable resistors and the pushing stroke.
The length of the multiple variable resistor must be increased, and with the trend towards miniaturization of electronic devices, the multiple variable resistor to be mounted is not desirable.

In addition, when operating the single-acting variable resistor for balance, the inner shaft 3 is rotated while applying pressure to the inner shaft 3.
It is difficult to apply a large amount of force to the product, and therefore, damage accidents such as those described above are unlikely to occur.

Purpose of the Invention The present invention solves the problems of the rotary multiple variable resistor as described above, and prevents wear and improves the strength of the most frequently used variable resistor for volume adjustment and the gear meshing part when operating the power switch. This has been achieved with a size comparable to that of conventional multiple variable resistors.

Structure of the Invention In order to achieve the above object, the present invention provides first and second
and a rotary switch that operates at the end of the rotation angle of the first variable resistor in synchronization with the first variable resistor. The first and second rotary variable resistors and the rotary switch have respective rotating bodies each having an internal gear having the same diameter and the same number of teeth, and usually the first variable resistor and the rotary switch. By pushing or pulling the operating shaft, one engages with the inner gear of the second variable resistor, and the other engages with the inner gear of the first variable resistor or the rotary switch. Two serration-like gears are provided at a constant interval around the outer periphery of the operating shaft, which rotates idly after moving from the position of meshing with the type switch.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows an embodiment of the multiple variable resistor of the present invention.

The functions of each variable resistor section in the figure are the same as in the conventional example: ``Double variable resistor for volume adjustment'' ``Double variable resistor for volume adjustment'' ``Double variable resistor for volume adjustment'' ``Power cut-off switch''
is a single-acting variable resistor for balance adjustment, and is also rotatably driven by an outer shaft 32 supported by a bearing 31. However, two serration-shaped gears 34, 35 having chevron-shaped knurling on the outer diameter are attached to the inner shaft 33 that drives ~, and these serration-shaped gears 34, 35
have the same diameter and the same number of teeth, and their angular positions are also set to match (as in the conventional example).
They are arranged at the same intervals as the arrangement of the inner peripheral gears 38 and 39 of the rotating bodies 36 and 37 of the volume variable resistor and the rotary power switch, respectively, which rotate in synchronization,
The engaged state is maintained by the biasing force of the cylindrical spring 40. The rotary body 36 of the variable resistor and the rotary body 37 of the rotary switch each have the serration gear 34 in the center thereof.
It has inner peripheral gears 38 and 39 that mesh with 35, and is connected by a cylindrical engagement part 41 so that the rotation angle positions of the two coincide and can be interlocked,
Furthermore, the outer periphery has stopper protrusions 42 and 43 for regulating the angle of rotation, respectively, and the respective housings 44 and
The rotating body 36 engages with the inner protrusions 46 and 47 of 45.
and 37 are set to rotate in exactly the same angular range. Further, the inner diameter of the cylindrical engaging portion 41 is set to be slightly larger than that of the serration gears 34 and 35.

When the inner shaft 33 is rotated in this state, the rotating body 3 of the variable resistor is rotated by the serration gear 34.
6 is rotated, the sliders 48 and 49 rotate and slide on the resistance elements 50 and 51, and the resistance value of the variable resistor changes, and the rotating body 37 of the rotary switch is also interlocked by the serration gear 35. It is the same as the conventional example, and the movable contact part 53 of the switch is driven by the driving protrusion 52 at the end of the rotation angle of the variable resistor to perform the switch switching. At the end, that is, at the end of the rotation angle of the variable resistor, the stopper protrusions 43, 42 of the respective rotating bodies 37, 36 are connected to the respective housings 45, 4.
By contacting the inner protrusions 47 and 46 of 4,
The rotation of these rotating bodies 36 and 37 is stopped.

Further, as shown in FIG. 3, by pushing the inner shaft 33 against the biasing force of the cylindrical spring 40, the serration gear 34 is released from meshing with the inner gear 38 of the rotary body 36 of the variable resistor, and the variable resistor becomes variable. The other serration-like gear 35 is moved and disengaged from the inner gear 39 of the rotary body 37 of the switch, and is engaged with the inner gear 55 of the rotary body 54 of the resistor. , 37 within the cylindrical engaging portion 41 connecting them. Then, when the inner shaft 33 is rotated while applying a pressing force to the inner shaft 33 in this state, the rotating body 54 of the variable resistor is rotated by the serration gear 34, and the slider 56 is accordingly moved onto the resistance element 57. By rotating and sliding the variable resistor, the resistance value of the variable resistor changes. During this time, the other serration gear 35 idles within the cylindrical engagement portion 41.

Thereafter, when the pressing force applied to the inner shaft 33 is removed, the serration gear 34 disengages from the inner gear 55 of the rotary body 54 of the variable resistor due to the urging force of the cylindrical spring 40, and the variable resistor is reactivated. The other serration-shaped gear 35 is also engaged with the inner gear 39 of the rotary body 37 of the rotary switch.
The state returns to the state shown in FIG. 2.

The multiple variable resistor of the present invention is configured as described above, and when operating the volume adjustment variable resistor and the power switch that operate in synchronization, which are the most frequently used operation parts in a car audio set, Two serration-shaped gears 34, 3 are provided on the inner shafts of the variable resistor and the rotary switch 36 and 37, respectively.
Since the rotary switch 5 is operated in a meshed state (normal state), when the rotary switch is operated, the large operating torque is mainly received by the gear 35 that meshes with the rotating body 37 of the switch. Therefore, 2
There is almost no effect on the cylindrical engaging portions 41 of the rotary bodies 36 and 37 and the meshing portion between the rotary body 36 and the gear 34 on the variable resistor side, and the play angle (rotational wobbling) of the inner shaft 33 due to wear of these parts is unlikely to occur.

As another embodiment, as shown in FIG. 4, two serration-shaped gears 62 and 63 attached to an operating shaft 61 are in mesh with each other in a normal state, and a rotary body 64 of a variable resistor and a rotary switch is used. , 65 are all through-type, so that the operating shaft 61 can be moved from the normal state.
By pressing , 62 of the two serration gears mesh with the rotating body 68 and inner gear 69 of the single-acting variable resistor for balance adjustment (at this time, the other
(the serration gears 63 move and idle in the cylindrical engagement part 70), and by further pulling the operation shaft 61 from the normal state, the serration gears 6
3 meshes with the inner circumferential gear 72 of the rotating body 71 of the variable resistor for adjusting sound quality (at this time, the other serration-shaped gear 62 idles within the cylindrical engagement portion 70).
Accordingly, it is possible to easily provide a small single-shaft multiple variable resistor in which three sets of variable resistors and a rotary switch are operated by one operating shaft.

Effects of the Invention As described above, the multiple variable resistor of the present invention normally meshes with the inner gears of the first variable resistor and the rotary switch, and is operated by pushing or pulling the operating shaft. one of which meshes with the inner gear of the second variable resistor, and the other of which is provided at regular intervals on the outer periphery of the operating shaft that moves from its meshing position with the first variable resistor or rotary switch and rotates idly. When operating the first variable resistor and rotary switch, the inner gear of each rotating body and the two serration gears provided on the operating shaft are connected to each other. It meshes well and withstands the large switching torque during switching operation of a rotary switch, and has excellent strength with no risk of rattling or damage due to wear. A number of serration gears are provided at regular intervals,
In order to separate the internal gear of each rotating body, the operation stroke of the operating shaft is approximately the same as in the conventional technology, and the length of the multiple variable resistor is also approximately the same as in the conventional technology to achieve the above effect. It is possible.

[Brief explanation of drawings]

Figure 1 is a side sectional view of a conventional multiple variable resistor.
FIG. 2 is a side sectional view of a multiple variable resistor according to an embodiment of the present invention in a normal state, and FIG. 3 is a side sectional view of the multiple variable resistor of the present invention in a state where the inner shaft is pressed. FIG. 4 is a side sectional view of a uniaxial multiple variable resistor according to another embodiment of the present invention. ...Double variable resistor for volume adjustment, ...Double variable resistor for volume adjustment, ...Power cut-off switch, ...Single acting variable resistor for balance adjustment, 31
... bearing, 32 ... outer shaft, 33 ... inner shaft, 34,
35... Serration gear, 36, 37...
Rotating body, 38, 39... Inner gear, 40... Cylindrical spring, 41... Cylindrical engaging portion, 42, 43
... Stopper protrusion, 44, 45 ... Housing, 4
6, 47...inner projection, 48, 49...slider,
50, 51...Resistance element, 52...Driving protrusion, 53...Movable contact portion, 54...Rotating body,
55... Inner gear, 56... Slider, 57...
resistance element.

Claims (1)

[Claims] 1. At least first and second rotary variable resistors operated by the same operating shaft and a rotation angle of the first variable resistor in synchronization with the first variable resistor. In a multiple variable resistor consisting of a rotary switch that operates at the end of Each rotating body having an internal gear meshes with the internal gear of the first variable resistor and the rotary switch, and by pushing or pulling the operating shaft, one of the rotating bodies is connected to the second variable resistor and the rotary switch. Two shafts are provided at regular intervals on the outer periphery of the operating shaft, one of which meshes with the inner gear of the first variable resistor, and the other rotates idly after moving from the position of meshing with the first variable resistor or rotary switch. A multiple variable resistor consisting of a serration gear. 2. A patent in which the rotating bodies of the first variable resistor and the switch, which rotate in synchronization, are connected by a hollow cylindrical part to match the rotational angular position of both, and the serration gear can idle within this cylindrical part. A multiple variable resistor according to claim 1. 3 The operating shaft is pulled so that the two serration-shaped gears provided on the outer periphery of the operating shaft mesh with the first variable resistor and the rotary internal gear of the rotary switch that operates in synchronization with the first variable resistor under normal conditions. Alternatively, the multiple variable resistor according to claim 1 is provided with an urging force in a pushing direction. 4. A stopper protrusion is provided on the outer periphery of each of the rotating bodies of the first variable resistor and the switch that rotate in synchronization to engage with the protrusion of the casing (or board) to regulate the rotation angle. A multiple variable resistor according to claim 1. 5 Two serration-shaped gears provided on the outer periphery of the operating shaft at a certain interval pass through both the first rotary variable resistor and the rotary inner peripheral gear portion of the rotary switch, which are in mesh with each other in the normal state. By pushing (or pulling) the operating shaft from the normal state, one of the two serration-shaped gears meshes with the rotary internal gear of the second rotary variable resistor, and the other gear idles. Furthermore, by pulling (or pushing) the operating shaft in the opposite direction from the normal state, one of the two serration gears meshes with the gear around the rotary body of the third rotary variable resistor, and the other The multiple variable resistor according to claim 1, wherein one gear is configured to idle.