KR19990001430U - Interlocking prevention structure of electronic knob - Google Patents

Abstract

The present invention relates to an interlock prevention structure of a knob for an electronic product.

Conventionally, since the support rib of the knob and the coupling pin of the front panel are simply welded and fixed, a gap is generated between the support rib and the front panel by operating the knob, thereby causing a problem in that other knobs operate in addition to the knob selected by the user.

However, in the present invention, the coupling ribs formed on the front panel by forming the locking protrusions 24 on the support ribs 22 of the knob 20 to be in close contact with the bottom surfaces of both support pieces 12a in the horizontal direction formed on the boss 12. The support piece of the boss 12 is fixedly assembled.

Therefore, it is possible to prevent the operation of the knobs other than the knob selected by the user so that the function setting of the knob selected by the user is precisely performed, thereby improving the reliability of electronic products such as a video cassette recorder.

Description

Interlocking prevention structure of electronic knob

The present invention relates to a structure for preventing interlocking of knobs for electronic products, and more particularly, to a mechanism for preventing interlocking of knobs for electronic products that can securely support the knob ribs on the front panel to prevent other knobs from working together. It is about.

In general, electronic products are equipped with various kinds of function selection knobs to set electronic functions. Looking at the video cassette recorder among the electronic products, the modes such as Power, Play, Eject, Review, etc., provided in the video cassette recorder are operated by the user. The function of the knob is performed by

As an example of such electronic products, a video cassette recorder as shown in FIG. 1 is equipped with a front panel (10) in front of a main chassis (MC), and a number of not shown on the front panel (10). The knob assembly KA is mounted. Therefore, the user can perform various functions provided in the video cassette recorder VCR by operating the knob assembly KA.

Meanwhile, a main circuit board PCB is mounted on the bottom of the main chassis MC, and a front circuit board (not shown) is vertically mounted on the rear surface of the front panel 10. In addition, an electronic component such as a tact SWitch (TS) or the like, which is operated by the operation of the knob assembly KA, is mounted on the front surface of the front circuit board to configure the electronic circuit.

As shown in FIG. 2, the conventional assembly of the knob for electronic products includes a plurality of tact switches SW mounted on the front surface of the main circuit board PCB, and a front panel on the front surface of the main chassis MC. 10) is provided, and a plurality of mounting holes 11 are formed in the front lower portion of the front panel 10.

A plurality of cross-shaped bosses 12 are formed in the lower rear side of the mounting hole 11 formed in the front panel 10, and the plurality of bosses 12 are formed with protrusion pins 13 protruding from each other.

Meanwhile, the knob 20 fitted to be exposed to the mounting hole 11 is integrally formed with a support rib 22 at a lower portion thereof, and the support rib 22 has a plurality of coupling holes 23 formed therein. The boss 20 is assembled to the front panel 10 by melting the end of the coupling pin 13 and the welding pin 13 of the boss 12.

Therefore, the knob 20 is fixed to the coupling pin 13 protruding from the boss 12 so that the knob 20 is pressed into the installation hole 11 in the rear direction of the front panel 10 whenever the knob 20 is pressed. Will move repeatedly. At this time, the pusher 20a (pusher: PS) formed extending in the rear direction of the knob 20 presses the tact switch SW mounted on the main circuit board PCB as the knob 20 moves. Play the VCR).

However, the conventional assembly structure of the knob for electronic products as described above, the support rib 22 formed on the lower portion of the knob 20 is simply welded and fixed with the coupling pin 13 formed on the rear surface of the front panel 10. Since any one of the plurality of knobs 20 is pressed, the welded portion is deformed to generate a gap between the support ribs 22 of the knob 20 and the boss 12 of the front panel 10.

That is, as shown in FIG. 2, the support rib 22 adjacent to the knob 20 has a force acting to move in the back direction from the knob 20 in spite of the welding fixation with the coupling pin 13. Then, the gap with the cross boss 12 is generated while gradually deforming the welded portion.

Therefore, since the other knobs 20 integrally formed on the support ribs 22 move together, the user operates the plurality of simultaneous tact switches TS at a small distance from the pusher 20a of the knob 20. Problems deteriorating the reliability of electronic products such as video cassette recorders (VCRs) have arisen, such as unwanted functions being selected.

An object of the present invention is to solve the above-mentioned problems in the prior art, by forming a locking projection on the support ribs that are caught on the boss formed on the front panel, the support rib of the knob is firmly fixed to the front panel, so the user selected Another object of the present invention is to provide an interlocking structure of a knob 20 for an electronic product that can prevent the function of another knob from being operated.

1 is an exploded perspective view showing a video cassette recorder as an example of an electronic product;

Figure 2 is a cross-sectional view showing a conventional knob assembly structure,

Figure 3a is a cross-sectional view showing a structure for preventing interlock knob of the present invention,

3B is a left side view of FIG. 3A;

♣ Explanation of symbols for the main parts of the drawing ♣

10; Front panel 11; Mounting hole

12; Boss 12a; Support

13; Binding pin 20; Knob

20a; Pusher 21; Tension rib

22; Support rib 23; Coupling hole

24; Jamming

The interlocking prevention structure of the knob for an electronic product of the present invention for achieving the above object is characterized in that the support rib of the knob is formed by forming a locking projection to be in close contact with the bottom surface of both supporting pieces formed in the boss in the horizontal direction.

Hereinafter, a preferred embodiment of the interlocking prevention structure of the knob for an electronic product according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is an assembly structure of the interlock prevention knob according to the present invention, Figure 4 is a left side view of Figure 3 according to the present invention.

3 and 4, the main circuit board PCB is mounted on the bottom of the main chassis MC, and the main circuit board PCB is mounted to protrude a predetermined distance toward the front of the main chassis MC. .

In addition, a plurality of tact switches SW are mounted on the front surface of the main circuit board PCB, and a front panel 10 is installed on the front surface of the main chassis MC, and a lower portion of the front panel 10 is disposed on the front lower portion of the front panel 10. A plurality of mounting holes 11 are formed.

Then, a plurality of cross-shaped bosses 12 are formed in the lower rear side of the mounting hole 11 formed in the front panel 10, and the support pieces 12a at equal intervals on the outer periphery of the plurality of bosses 12. Is formed, the rear end portion is coupled to the coupling pin 13 is formed.

On the other hand, the knob 20 to be exposed to the mounting hole 11 is formed with a tension rib 21 on the back portion, the support rib 22 is integrally formed in the downward direction of the tension rib 21. In this support rib 22, a plurality of coupling holes 23 are formed to melt the end of the coupling pin 13 and the welding pin 13 of the boss 12, that is, the front of the knob 20. It is assembled to the panel 10, and at this time, the engaging projection 24 in close contact with the bottom surface of the support piece 12a of the boss 12 is formed in both parts of the coupling hole (23).

Referring to the operation and effects of the present invention configured as described above in detail.

When the user selects and presses any one of the plurality of knobs 20 exposed on the front of the front panel 10, the knobs 20 are elastically supported by the tension ribs 21 as shown in FIG. 5. It will be pressed backwards.

At this time, the movable knob 20 is firmly fixed to the support rib 22 formed integrally with the knob 20 by the boss 12 and the coupling pin 13 protruding from the rear surface of the front panel 10. Only the knob 20 selected by the user is pressed.

That is, a plurality of engaging protrusions 24 are formed in the horizontal direction on the front surface of the support rib 22 adjacent to the knob 20 so as to be in close contact with the bottom surface of the support piece 12a formed on the outer periphery of the boss 12. It is firmly fixed to the boss 12 and the coupling pin 13 of the front panel 10.

At this time, when a force that pushes the support ribs 22 counterclockwise due to the movement of the knob 20 acts on the support ribs 22, the locking protrusions 24 protruding from the support ribs 22 are clockwise. Ascending force will act. However, the locking protrusion 24 of the support rib 22 is caught by the support piece 12a of the boss 12 and prevented from moving.

Therefore, as shown in FIGS. 3 and 4, no gap is generated between the support ribs 22 and the coupling pins 13 formed in the boss 12, so that a gap is generated between the support ribs 22 and the boss 12. Since the support rib 22 and the coupling pin 13 is maintained firmly by preventing the plurality of other knobs 20 integrally connected to the support ribs 22, the knobs 20 selected by the user are prevented. Only the knob 20 selected by the user is operated because it does not flow except).

On the other hand, the knob 20 firmly fixed and assembled by the locking protrusion 24 of the support rib 22 is pusher 20a formed on the rear surface of the knob 20 when the knob 20 is pressed by the user. While operating counterclockwise, the tact switch TS mounted on the main circuit board PCB is operated to select a function of the knob 20 desired by the user.

On the other hand, the above embodiment is merely described an example of a preferred embodiment of the present invention, the scope of application of the present invention is not limited to this, and can be changed appropriately within the scope of the same thought, for example video cassette It is widely applicable to electronic and electrical products such as various home appliances such as recorders and audio.

As described above, the present invention forms a locking protrusion on the support rib of the knob to fix and assemble the support pin of the coupling pin and the boss formed on the front panel, thereby preventing the operation of other knobs other than the user-selected knob. This is done exactly so it has a very useful effect of improving the reliability of electronic products such as video cassette recorders.

Claims (1)

In the lower part of the front panel, a cross-shaped boss is formed, and a coupling pin protrudes from the boss so that a support rib of the knob is fitted and fixedly installed. The support ribs 22 of the knob 20 are formed with a locking protrusion 24 to be in close contact with the bottom surfaces of both support pieces 12a in the horizontal direction formed on the boss.