JPH0749641Y2 - Push button device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A Field of Industrial Application The present invention relates to a push button device, and is particularly suitable for application to a cassette tape recorder having an erasure prevention device.

B Outline of the Invention In the push button device, the present invention constitutes a push button device by inserting an overload absorbing elastic member between a push button and an overload absorbing link rotatably supported by the push button. . As a result, even if the push button is overloaded, damage to other components can be prevented, and the structure that absorbs the overload can be completed in the push button device, which can facilitate maintenance and can be used for general purposes. You can improve your sex.

C Conventional Technology Conventionally, in this kind of cassette tape recorder, an erroneous erasure prevention device is provided, and the user puts it in the erasure prevention state as necessary and loads it into the tape recorder.

That is, as shown in FIG. 4, the tape cassette 1 to be loaded has a recess 3 on the back surface 2 of the case and an erroneous erasure prevention claw 4 provided on the recess 3. A user bends and cuts the tape cassette 4 as required, and the tape cassette 1 is loaded in the tape recorder 10 in an erasure prevention state.

Here, as shown in FIG. 5, the tape recorder 10 has a housing 11
It has a piano key type sound recording operation button 12 provided on the front side and a erasure prevention device 25 provided on the rear side, and the sound recording operation button 12 is formed on the rear side of the box-shaped key body. The pin engaging hole 14 is pivotally supported by a fulcrum pin 14A fixed to a frame portion (not shown) in the housing 11 so that the pin engaging hole 14 can be rotated in the vertical direction as shown by an arrow a. .

Further, the recording operation button 12 is adjacent to the rear lower end 12B and the front end 2
The recording lever 20 is supported by a guide (not shown) so that the recording lever 20 can slide in the front-rear direction as indicated by an arrow b so as to attach 0A.

The recording lever 20 has a pin 20C projecting from the lower side surface 20B, and the recording switch portion 21 according to the sliding movement of the recording lever 20.
The internal switch provided therein is turned on and off.

Therefore, when the user presses the recording operation button 12 for recording, the rear lower end portion 12 is rotated by the rotation operation of the recording operation button 12.
When B presses the front end portion 20A of the recording lever 20 backward, the recording lever 20 is slid rearward, whereby the protruding pin 20C turns on the recording switch.

On the other hand, the erroneous erasure prevention device 25 has an L-shaped erasure prevention detection claw 26, and whether or not the erroneous erasure prevention claw 4 of the loaded tape cassette 1 is cut (that is, the loaded tape cassette). 1 is in the erasure prevention state), and the rotation operation of the recording operation button 12 is locked or unlocked according to the detection result.

That is, the erasure prevention detection claw 26 is a fulcrum pin in which the pin engagement hole 27 provided in the bent portion is fixed to the frame portion in the housing 11.
27A is pivotally supported so as to be able to rotate in the front-rear direction as indicated by an arrow c, and a protrusion 26C formed at an upper end portion by a spring 28 fixed at one end to a fixing pin 29 is moved forward. It is rotationally biased to rotate.

As a result, when the tape cassette 1 is loaded in the tape recorder 10, the erroneous erasure prevention claw 4 provided on the back surface 2 of the tape cassette 1 is cut, and if the tape cassette 1 is in the erasure prevention state, the fifth As shown by the solid line in the figure, the erasure prevention detection claw 26 is rotated by the biasing force of the spring 28 to the position where the projection 26C projects into the recess 3 of the tape cassette 1, thereby causing the rear end of the recording lever 20 to move. Part 20D
The front end portion 26B is held by the stopper 20E provided at the position (this is referred to as an erasure prevention position).

At this time, the rear end 20D of the recording lever 20 has the erasure prevention detection claw 2
Since the front end portion 26B of 6 is in a state of receiving the front end portion 26B, the state in which the front end portion 26B of 6 cannot be slid rearward, and even if the user tries to depress the recording operation button 12, the recording operation button 12 is The side lower end portion 12B comes into contact with the front end portion 20A of the recording lever 20 so that it cannot rotate downward.

Thus, when the tape cassette 1 in the erasure prevention state is loaded, the tape recorder 10 operates in the erasure prevention mode (the recording is disabled at this time) because the erasure prevention detecting claw 26 is held at the erasure prevention position. maintain.

On the other hand, when the erroneous erasure prevention claw 4 of the tape cassette 1 is not cut (that is, the tape cassette 1 is not in the erasure protection state), the erasure prevention detection claw 26
When the tape cassette 1 is loaded, the projection 26C is pressed against the erroneous erasure prevention claws 4 of the tape cassette 1, so that the tape cassette 1 is rotated rearward along the arrow c. As shown by the broken line, the state maintained at the erasure prevention release position is maintained.

At this time, the recording lever 20 is brought into a state in which it can slide backward as indicated by the arrow b, so that when the user presses the recording operation button 12, the recording operation is performed by the rotation operation of the recording operation button 12. The lever 20 slides so that the recording switch unit 21 can be turned on.

D The problem to be solved by the invention is that the tape cassette 1 in the erasure prevention state is loaded into the tape recorder 10 and when the tape recorder 10 is in the erasure prevention mode, the user presses the recording operation button 12 with an excessive pressing force.
When, for example, a key operation is shocked, the recording lever 20 and the erroneous erasure prevention device 25 are deformed or damaged due to excessive stress.

Incidentally, in general, in this kind of cassette tape recorder, as one means of downsizing and simplification of the structure, a method of manufacturing the recording lever as thin as possible by molding a synthetic resin material, for example, is adopted. If excessive pressing force is applied, it may be deformed or damaged.

The present invention has been made in consideration of the above points, and an object thereof is to propose a push button device having a simple structure which can prevent an excessive pressing force from being applied to the recording lever and the erroneous erasure prevention device.

E Means for Solving the Problems In order to solve such problems, in the present invention, a push button, an overload absorbing elastic member for transmitting a pressing force applied to the push button, and a rotatable push button. An overload absorption link that is supported and rotates by receiving the pressing force transmitted by the overload absorption elastic member to operate the internal switch;
The overload given to the push button is absorbed by the compressive force of the overload absorbing elastic member.

F action By inserting the overload absorbing elastic member 33 between the push button 32 and the overload absorbing link 34 rotatably supported by the push button 32, an excessive pressing force is applied to the push button 32. When pressed, this can be absorbed by the compressive force of the overload absorbing elastic member 33, and the structure for absorbing the overload can be completed in the push button device 31.

G Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1 in which parts corresponding to those in FIG. 5 are designated by the same reference numerals, the piano key type recording operation button 31 of the cassette tape recorder is moved vertically by the fulcrum pin 14A as in the case of FIG. Box-shaped push-button 32 pivotally supported so that it can be rotated
In addition to this, it has an overload absorption spring 33 and an overload absorption link 34.

The overload absorption link 34 has a substantially T-shape, and its upper end portion
A pair of fulcrum pins 34B are integrally formed on 34A so as to project in the left-right direction.
Are rotatably engaged with a pair of pin engaging holes provided in both left and right inner side walls 32B.

Further, the overload absorption spring 33 has one end engaged with and held by a protrusion 32D provided on the upper inner wall 32C of the key press button 32, and the other end abutted against the forward protruding end portion 34C of the overload absorption link 34. Thus, when the user presses the key press button 32 in the erasure prevention release mode, the pressing force applied to the key press button 32 is applied to the front protruding end portion via the overload absorption spring 33. 34C is transmitted to rotate the overload absorption link 34. At this time, the overload absorption spring 33 moves the recording lever 20 to the arrow b.
The spring constant is set so that the recording switch of the recording switch unit 21 can be turned on by sliding the recording switch of the recording switch unit 21 in the rearward direction.

In the case of this embodiment, a plate-shaped stopper 16 is provided, for example, in the frame portion inside the housing 11, and the recording operation button 32 is pushed by the arrow a.
By rotating the recording operation button 32 downward in the direction indicated by, the front lower end portion 12A of the recording operation button 32 is received so that the rotation operation of the recording operation button 32 can be restricted at a predetermined position.

In the above configuration, as shown in FIG. 2, when the user presses the key-depressing button 32 to the position where the tape-recording button 32 comes into contact with the stopper 16 when the tape recorder 30 is ready to record in the erasure prevention release mode, the overload is absorbed. The spring 33 transmits the pressing force applied to the key press button 32 to the overload absorption link 34 to rotate the overload absorption link 34 downward. At this time, the lower end 34D of the overload absorption link 34 moves the recording lever 20 to the arrow b.
The recording switch of the recording switch unit 21 is turned on by pushing and sliding it backward in the direction indicated by.

On the other hand, when the tape recorder 30 is in a state in which recording cannot be performed in the erasure prevention mode, the recording lever 20 is held by the erasure prevention detection claw 26 in a position where it cannot slide backward as shown in FIG. , The lower end of the overload absorption link 34
When 34D comes into contact with the recording lever 20, it is locked so that it cannot rotate.

In this state, when the user operates the key pressing button 32 with an excessive pressing force to rotate the key pressing button 32 downward, the pressing force compresses the overload absorbing spring 33.

Here, the components of the recording lever 20 and the erroneous erasure prevention device 25 are set to a strength capable of putting the overload absorption spring 33 into the maximum compression state via the overload absorption link 34, and the tape recorder 30 is set in the erasure prevention mode. In some cases, even when the user accidentally taps the recording switch (that is, the key pressing button 32) with an impact and an excessive pressing force, even when the overload absorption spring 33 receives the pressing force and becomes in the compressed state. , So that it will not be damaged.

Here, the key press button 32 is limited by the stopper 16 when the tape recorder 30 is excessively rotated in the erasure prevention mode or the erasure prevention release mode.

According to the above-described configuration, the recording operation button 31 receives the key pressing button 32 operated by the user and the pressing force applied to the key pressing button 32 via the overload absorption spring 33. By configuring with the overload absorption link 34 that slides 20, even when the tape recorder 30 is in the erasure prevention mode, the overload absorption spring 33 does not shock or excessively press the recording operation button 31. By absorbing the key-pressing operation, the key-pressing button can be used without damaging the recording lever 20 and the erroneous erasure prevention device 25.
The key 32 can be pressed to a predetermined position where it is abutted by the stopper 16, so that the components of the tape recorder 30 including the recording lever 20 and the erroneous erasure prevention device 25 can be prevented from being damaged.

In the above-mentioned embodiment, the case where the present invention is applied to the recording operation button 31 has been described, but the present invention is not limited to this, and the same effect can be obtained when applied to a push-type operation button. .

Also, in the above-described embodiment, the lower surface 20 of the recording lever 20 is
The case where the recording switch 21 is turned on by providing the protruding pin 20C on B has been described, but the present invention is not limited to this, and for example, push it so as to contact the lower side surface 34D of the overload absorption link 34. Other methods may be applied, such as providing a mold recording switch.

Further, in the above-described embodiment, the case where the rotating shaft of the overload absorption link 34 is provided on the side wall of the key pressing button 32 has been described, but instead of this, it is provided on the rotating shaft of the key pressing button 32. Can also obtain the same effect.

Further, in the above-mentioned embodiment, the case where the shape of the overload absorption link 34 is formed into a substantially "T" shape has been described, but the present invention is not limited to this, and another shape such as an L shape may be used. May be.

Further, in the above-described embodiment, the case where the stopper 16 is used to limit the rotation operation of the key press button 32 has been described, but the present invention is not limited to this, and the point is that the key press button 32 is rotated. It suffices if the dynamic motion can be restricted at a predetermined position, and various other methods can be applied as the restriction means.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the cassette tape recorder has been described, but the present invention is not limited to this and can be widely applied to other recording / reproducing devices such as a video tape recorder.

H Effect of the Invention As described above, according to the present invention, the push button device is configured by inserting the overload absorbing elastic member between the push button and the overload absorbing link rotatably supported by the push button. However, by absorbing the overload by the compressive force of the overload absorbing elastic member, it is possible to prevent damage to other components even when an excessive pressing force is applied to the push button, and absorb the overload. Since this structure can be completed in the push button device, the maintainability can be facilitated and the versatility can be enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view showing one embodiment of the present invention in detail, FIG. 2 is a schematic sectional view showing a recording state, and FIG. 3 is a recording prevention state. FIG. 4 is a schematic sectional view showing a tape cassette, and FIG. 5 is a schematic sectional view showing a conventional example. 1 ... Tape cassette, 4 ... Accidental erasure prevention claw, 10, 30
…… Tape recorder, 16 …… Stopper, 20 …… Recording lever, 25 …… Erroneous erasure prevention device, 26 …… Erasure prevention detection claw, 31
...... Recording operation button, 32 …… Key press button, 33 …… Overload absorption spring, 34 …… Overload absorption link.

Claims (1)

[Scope of utility model registration request] 1. A push button, an overload absorbing elastic member for transmitting a pressing force applied to the push button, a rotatably supported by the push button, and transmitted by the overload absorbing elastic member. An overload absorbing link that rotates by actuating the internal pressure to actuate the internal switch, and absorbs the overload applied to the push button by the compressive force of the overload absorbing elastic member. Push button device.