JPS6222032Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching device for a switch having three or more switching positions, and more particularly to a device for changing the number of switching positions.

The radio receiver is equipped with a band switching device. This device is generally configured with three bands for domestic use and four bands for overseas use due to differences in radio wave bands.
Therefore, it has been customary in the past for domestic radio receivers and overseas radio receivers to construct band switching devices from completely different parts, including electrical circuits. However, according to this method, the number of types of lots and the number of parts increases, which increases manufacturing costs and is inconvenient in terms of management and service. Therefore, in order to standardize the mechanical parts of the band switching device for domestic and overseas use, for example, the intermediate moving body interposed between the knob and the switch can be constructed so that it can be broken off, and a part of it can be removed. A switching device has been proposed in which the number of switching positions can be changed by breaking off the switching device. However, this type of device requires a lot of effort to break off, and if it is broken off by mistake, it cannot be restored to its original state.

The present invention aims to overcome such problems, and provides a switching device in which a switch capable of taking three or more switching positions is switched by a knob via an intermediate moving body. A protrusion is formed at one end of the movable body in the moving direction, and a contact portion that abuts the protrusion is provided on the fixed side, and its movement stroke changes depending on the mounting orientation of the intermediate movable body, thereby This invention relates to a switch switching device characterized in that the number of switching positions of the switch is changed. Therefore, according to the present invention, it is possible to change the number of switching positions of the switch simply by changing the mounting orientation of the intermediate moving body.

An embodiment in which the present invention is applied to a band switching device for a radio receiver will be described below with reference to the drawings.

As shown in FIG. 1, this band switching device includes a band switching switch 1 and a rotatable knob 2.
and a slidable intermediate moving body 3. The switch 1 is mounted on a printed circuit board 4 shown in FIG. 3, and its contacts are connected to a band switching circuit. The operator 5 provided in the switch 1 so as to protrude upward is connected to an opening 7 of the chassis 6 (see FIGS. 2 and 3).
It is received in one of a pair of engagement holes 8 and 9 formed in the intermediate moving body 3 so as to pass through the intermediate moving body 3.

The intermediate moving body 3 is slidably held by a chassis 6. In other words, chassis 6 is
Molded from a synthetic resin such as ABS resin, the chassis 6 is formed with a rail 10 having a U-shaped cross section. It's starting to move. Note that the opening 7 is formed on the bottom surface of this rail 10. Further, two holding pieces 11 are integrally connected to each of the pair of opposing side walls constituting the rail 10, thereby preventing the intermediate moving body 3 from falling off the rail 10. .

The intermediate moving body 3 is formed symmetrically with respect to an imaginary central axis 12 shown in FIG.
Further, this movable body 3 is formed with a wall surface 13 that protrudes upward and is bent, and this wall surface 1
3 has a pair of notches 14 and 15 formed therein. These pair of notches 14 and 15 are also connected to the virtual axis 12.
It is in a symmetrical position. Therefore, the intermediate moving body 3 can be inserted into the rail 10 from either the longitudinal end or the rear end. That is, there are two types of attachment postures of the intermediate moving body 3 to the rail 10. Further, at one end of the intermediate moving body 3 in the longitudinal direction, a projection 16 is provided.
is provided. Note that only one protrusion 16 is provided, and therefore, it will be arranged at different positions depending on the mounting posture of the intermediate moving body 3.
A contact portion 17 is integrally provided on the chassis 6 in correspondence with the projection 16.
It has become possible to come into contact with

Next, regarding the support of the knob 2, the knob 2 is integrally formed with a sector-shaped piece 18 that protrudes downward, and a small circular recess is formed on the left side surface of the lower end of the sector-shaped piece 18 in FIG. 19 is provided, and a fulcrum pin 20 is provided on the right surface. A fulcrum pin 22 is provided at the lower end of the support piece 21 of the chassis 6 corresponding to the recess 19.
is provided. Further, a support wall 23 is provided on the chassis 6 opposite to the support piece 21, and a guide groove 24 is formed in the support wall 23 to extend vertically. Therefore, when the fan-shaped piece 18 of the knob 2 is inserted into the gap between the support piece 21 and the support wall 23 and moved downward, the pin 20 of this fan-shaped piece 18 is guided by the guide groove 24 and moves downward. . The support piece 21 is elastically deformed to the left in FIG.
The recess 1 at the tip of the fan-shaped piece 18 is caused by the elastic restoring force of
9. With this, knob 2 is connected to pin 22.
It is assembled in a state where it is rotatably supported around the center.

There is a cylindrical part 26 on the back side of the fan-shaped piece 18 of the knob 2.
is integrally formed, and a coil spring 27 and a ball 28 are housed and held in this cylindrical portion 26. Correspondingly, for example, four grooves 29 are formed in the wall of the chassis 6, and these grooves 29 are adapted to join with the balls 28. That is, the coil spring 27, the ball 28, and the groove 29.
The moderation mechanism is composed of: Therefore, the knob 2 is clicked and stably held by this moderation mechanism at each switching position of the switch 1. Further, an operating pin 30 is integrally connected to the front side of this fan-shaped piece 18, and this pin 30 is configured to engage with one of the pair of notches 14 and 15 of the intermediate moving body 3. ing. Further, a pair of abutting portions 31 and 32 are provided on the wall of the chassis 6 on both sides of the groove 29 to limit the amount of rotation of the knob 2.

Next, the operation of the band switching device having the above configuration will be explained. First, in the case of application to a radio receiver for domestic use, as shown in FIG. 4, the intermediate moving body 3 is attached to the rail 10 so that the protrusion 16 thereof is on the right side. Also, the operating pin 30 of knob 2
is engaged with one notch 14 of the movable body 3, and the operator 15 of the switch 1 is further engaged with one of the engagement holes 8. When the knob 2 is rotated in this state, the intermediate moving body 3 is moved via the operating pin 30, and the switch 1 is further switched via the operator 5. Moreover, at this time, since the intermediate moving body 3 is attached in such a position that the protrusion 16 of the intermediate moving body 3 is in a position close to the abutting part 17 of the chassis 6, the intermediate moving body 3 is attached to the abutting part 17. Protrusion 16
When they come into contact with each other, the intermediate moving body 3 cannot move to the right any further, and therefore the clockwise rotation of the knob 2 is also restricted. This therefore makes it possible to limit the number of switching positions of the changeover switch 1 to, for example, three.

Next, when applying to a radio receiver for overseas, as shown in FIG. 5, the intermediate moving body 3 is attached to the rail 10 so that the protrusion 16 thereof is on the left side. At this time, the operating pin 30 of the knob 2 is engaged with the other notch 15, and the operator 5 of the switch 1 is engaged with the other engaging hole 9. When the knob 2 is operated in this manner, the switch 1 is switched via the intermediate moving body 3. Moreover, in this case, since the protrusion 16 of the intermediate moving body 3 does not come into contact with the contact portion 17 of the chassis 6, the sliding stroke of the intermediate moving body 3 can be increased.
Therefore, the switching position of the changeover switch 1 is set to 4, for example.
can be made into

Therefore, it is possible to change the number of switching positions of the switch 1 by changing the stroke only by changing the mounting posture of the intermediate moving body 3. Furthermore, if the intermediate moving body 3 is attached by mistake, it is sufficient to simply change the attitude of the moving body 3 after removing the knob 2, and no parts are wasted. Also, since it does not involve cutting out a part of the intermediate moving body 3,
The precision of the parts of the intermediate moving body 3 can be maintained constant. Furthermore, since one part can be used for both domestic and overseas radio receivers, it is only necessary to prepare one type of mold for the intermediate moving body 3, which is advantageous in terms of parts management and service.

As described above, the present invention forms a protrusion at one end of the intermediate movable body in the direction of movement, and provides an abutment portion that abuts the protrusion on the fixed side, so that the position of the intermediate movable body can be adjusted depending on the mounting orientation of the intermediate movable body. Since the movement stroke changes and the number of switching positions of the switch changes accordingly, it reduces the number of parts and eliminates the need to cut out some parts. Cost can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a band switching device for a radio receiver. FIG. 1 is an exploded perspective view of this embodiment, FIG. 2 is a plan view of the same, and FIG. 2, FIG. 4 is a sectional view taken along line 2 in FIG. 2, and FIG. 5 is a sectional view similar to FIG. 4 when the mounting posture of the intermediate moving body is changed. In addition, in the symbols used in the drawings, 1... Band changeover switch, 2... Knob, 3... Intermediate moving body, 6... Chassis, 10... Rail, 16
. . .Protrusion, 17 . . . Contact portion.

Claims (1)

[Scope of utility model registration request] In a switching device in which a switch capable of taking three or more switching positions is switched by a knob via an intermediate moving body, a protrusion is formed at one end in the moving direction of the intermediate moving body, and an abutment that abuts the protrusion. a portion is provided on a fixed side, and its movement stroke changes depending on the mounting orientation of the intermediate moving body,
A switching device for a switch, characterized in that the number of switching positions of the switch is thereby changed.