JPS645786Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a switching display device for a rotary switch, which is particularly suitable for small-sized electrical equipment.

As shown in Figure 4, electrical measuring instruments designed to be small enough to be operated with one hand,
A part of the rotary knob 5 of the rotary switch is made to protrude from the side wall of the housing 4, so that the rotary knob 5 can be operated while holding the housing 4. The rotation angle a for each pitch of this type of rotary switch is generally 30°, but
As mentioned above, a part of the rotary knob 5 is attached to the housing 4.
Naturally, when the housing 4 is made to protrude from the side wall of the housing 4, the range display 11 cannot be scaled around the entire circumference of the housing 4 side. Therefore, conventionally, a rotary switch with a limited rotation angle and about seven contacts has been used. on the other hand,
If the protruding part of the rotary knob 5 is reduced, the display 11 for the range etc. can be increased accordingly, allowing the use of a rotary switch with a larger number of contacts, but this has another disadvantage of making it difficult to operate with one hand. arise.

Therefore, the purpose of this invention is to provide a switching display device for a rotary switch that allows the rotary knob to be operated reliably with one hand even when using a rotary switch with a large rotation angle of 180 degrees or more and a large number of contacts. It's about doing.

Hereinafter, embodiments of this invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the rotary switch 1 is mounted through a printed circuit board 2 so that the end of its rotating shaft 3 protrudes above a housing 4. Rotary knob 5
are fitted so that they rotate together. This rotary knob 5 is arranged so that a part thereof protrudes to the side of the housing 4 so that it can be operated with one hand while holding the housing 4. In this case, the boss portion of the rotary knob 5 is A main gear 6 centered on the axis of rotation is formed on the outer peripheral wall. On the other hand, the main gear 6 is located on the housing 4 side.
An internal gear 7 is provided concentrically with a predetermined spacing. Also, referring to FIG. 2, a slit 8 is formed in the rotary knob 5, passing through the middle of the main gear 6 and the internal gear 7, and drawing an arc around the axis of rotation between them. A driven gear 9 is disposed between the main gear 6 and the internal gear 7 and meshes with both of them. This driven gear 9 has a cylindrical index 10 projecting on its axis of rotation, and this index 10 is slidably inserted into the slit 8 of the rotary knob 5. In this embodiment, the gear ratio between the internal gear 7 and the main gear 6 is 2:1, and the rotation angle for each pitch of the rotary switch 1 used here is 30 degrees. For example, a plurality of switching indicators 11 are provided on the housing 4 at intervals of 15 degrees.

Next, the operation of this invention will be explained. When the rotary knob 5 is rotated, the main gear 6 integrated therewith rotates, and the driven gear 9 rotates along the internal gear 7 in conjunction with this. Then, the indicator 10 integrated with the driven gear 9 slides along the slit 8 of the rotary knob 5. In this case, the internal gear 7 and the main gear 6
Since the gear ratio is set to 2:1, when the main gear 6 makes one revolution, the driven gear 9 moves half a revolution on the internal gear 7. Therefore, even if the rotation knob 5 is rotated 360 degrees, the index 10 only moves 180 degrees around the rotation axis 3. As a result, the switching display 11 can be changed around the rotation axis 3.
It can be kept within 180°.

In the embodiment described above, as shown by the imaginary line in FIG. A small hole 13 provided at an eccentric position may be fitted into the head of the indicator 10 and rotated together with the indicator 10, thereby covering the slit 8. In addition to improving the appearance, the correspondence between the indicators 10 and each display 11 can be made clearer by providing marks such as arrows on the outer peripheral edge of the disc 12 starting from the indicators 10.

Further, as another embodiment, as shown in FIG. 3, a main gear 6 may be formed on the outer periphery of the rotary knob 5. In this case, the internal gear 5 is integrally formed with an arc-shaped step 14 provided in the housing 1, and the driven gear 9 meshes with the main gear 6 and the internal gear 7 on the outer periphery of the rotary knob 5. . A decorative panel 15 integral with the housing 4 is placed on the upper surface of the housing 4, and a slit 8 is formed in the decorative panel 15.

As is clear from the description of the embodiments described above, according to this invention, even if a rotary switch with a large number of contacts and a rotation angle of 180° or more is used, each rotary knob can be attached to the housing surface along the outer periphery of the rotary knob. It becomes possible to provide switching indications corresponding to the contacts.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a switching display device for a rotary switch according to this invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a vertical cross-sectional view showing another embodiment, and FIG.
The figure is a plan view showing a conventional example. In the figure, 1 is a rotary switch, 3 is a rotating shaft, and 4 is a rotary switch.
is the housing, 5 is the rotation knob, 6 is the main gear, 7
9 is an internal gear, 9 is a driven gear, 10 is an index, and 11 is a switching display.

Claims (1)

[Scope of utility model registration request] A rotary switch installed in a housing of an electrical device, a rotary knob fitted onto the rotating shaft thereof and having a part of its outer periphery protruding outward from a side wall of the housing, and one of the rotary switches.
The rotary switch includes a switch switching display provided on the housing surface corresponding to a rotation angle for each pitch, and the rotary switch is rotated through a portion of the rotary knob that protrudes from a side wall of the housing. In the switching display device, an internal gear formed on the housing side centering on the rotation axis, and a main body formed concentrically on the rotation knob side so as to face the internal gear at a predetermined distance. It is characterized by comprising a gear and a driven gear including an index disposed between the internal gear and the main gear, and an advance angle of the driven gear is made smaller with respect to a rotation angle of the rotary knob. Rotary switch switching display device.