JPS6156646B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a push-button time switch, which allows an appropriate time limit to be selected simply by selectively pressing the push button, and which has great utility value as the button returns after the set time limit has elapsed. The purpose is to provide an inexpensive push button type time switch.

Most conventional time switches were spring type, and the time was set by turning the knob until the desired time was obtained. Also, if the time is a small angle, for example, one minute or less, you must first turn the knob to a large angle and then return it to the desired time angle to set the time, which takes time and effort. It was hard.

In particular, dehydration timers for electric washing machines are often set to 15 to 30 seconds in order to reduce the squeezing rate of dehydrated material, and there was a need for a timer that was easy to operate. In addition, in the case of the spring type, there was a problem that impurities could get inside, causing complaints such as interruptions.

The present invention solves the above-mentioned conventional problems, and one embodiment thereof will be described below.

In the figure, 1 is an AC power source, 2 is a load, and 3 is a power switch that is opened and closed by a push button switch, forming a closed circuit. Further, 4 surrounded by a dotted line is a CR timer circuit, which is connected in parallel with load 2.

The CR timer circuit 4 includes a diode 5, a resistor 6, and a capacitor 7 for rectifying and smoothing the applied AC power. 8 and 9 are resistors that divide the rectified and smoothed output, and 10 is an N-gate thyristor with a gate 11 connected between the resistors 8 and 9.

12a, 12b, and 12c are resistors for setting time constants, which are connected in series to the switching contacts 13a, 13b, and 13c, respectively. Each series circuit is connected in parallel, and one end of this parallel circuit is The cathode of the diode 5 is connected to the anode 14 of the N-gate thyristor 10 at the other end.

A P-gate thyristor 15 has a gate 16 connected to the cathode of an N-gate thyristor 10, and an electromagnet 17 serving as electromagnetic locking means is connected to the cathode. 18 is a capacitor.

Next, the power switch 3 and the push button switch 19 for opening and closing the contacts 13a, 13b, 13c will be explained based on FIGS. 2 to 4. 20a, 20b, 2
0c is an operation button which is always urged by a spring member 21 so as to protrude upward. 22 is a switch case. 23 are the operation buttons 20a, 20b, 2
The operation buttons 20a, 20 slide to the right by pressing 0c and return to their original state by passing the button protrusions 24a, 24b, 24c.
A lock plate that locks the operation buttons 20a and 20c is attracted by the excitation of the electromagnet 17 and locks the operation buttons 20a and 20c.
b, 20c are unlocked.

Reference numeral 25 denotes an interlocking plate disposed overlapping the lock plate 23, which slides in the direction of arrow B (rightward) when the operation buttons 20a, 20b, and 20c are pressed.
The power switch 3 is closed by an operating protrusion 26 provided on a portion thereof. Note that this interlocking plate 25 is connected to the button protrusions 24a of the operation buttons 20a, 20b, and 20c, which are locked in the pressed state.
24b and 24c prevent the power switch 3 from returning to its original state and keep the power switch 3 closed. 27a, 27b, 27c are button protrusions 24a,
A protrusion provided on the opposite surface of 24b and 24c.
Contacts 12a, 12b, 12 of CR timer circuit 4
It opens and closes c.

The operation of the above configuration will now be described.
First, when one of the push button switches 19, for example, the operation button 20b for convenience, is pressed in the direction of arrow A as shown in FIG. 3, the contact 13b of the time constant selection switch of the CR timer circuit 4 is closed by the protrusion 27b. Simultaneously with this operation, the interlocking plate 25 is pushed in the direction of arrow B by the button protrusion 24b, and the operating protrusion 26 provided on the interlocking plate 25 turns on the power switch 3 to start energizing the load 2, and at the same time, the CR timer circuit 4
energization is also started and the timer operation starts.
That is, the AC power applied to the CR timer circuit 4 is rectified by the diode 5, resistor 6, and capacitor 7, and becomes a constant DC voltage. This voltage is then divided by resistors 8 and 9 to determine the voltage at the gate 11 of the N-gate thyristor 10. On the other hand, the anode 14 voltage gradually rises with a time constant determined by the time constant setting resistor 12b and the capacitor 19, and when it exceeds the gate 11 voltage, the N gate thyristor 10 is turned on and the P gate thyristor 15 is triggered at the same time. The electromagnet 17 is turned on and the electromagnet 17 is energized. Then, the electromagnet 17 attracts the lock plate 23 in the direction of arrow c and releases the lock of the button protrusion 24b. As a result, the operating button 20b returns to its original state due to the biasing force of the spring 21, and at the same time, the interlocking plate 2
5 is returned to its original state by the force of the spring 28, and the power switch 3 is opened. As a result, load 2 and
When the energization of the CR timer circuit 4 is finished and the energization of the electromagnet 17 is cut off, the lock plate 23 is locked by the spring 2.
The action is completed by returning to the original state with the help of the 9th auxiliary force.

Although not explained here, by pressing another operation button, a timer operation for the time set by the corresponding resistors 12a, 12b, and 12c can be obtained.

As described above, according to the present invention, a predetermined timer operation can be obtained simply by selectively pressing the operation button, and the power is automatically turned off after the timer operation is finished, making it easy to use and easy to use. will be very good. Moreover, the push button switch for opening and closing the power switch opens and closes the power switch via an interlocking plate that moves when each operation button is pressed, so there is no need to provide several power switches corresponding to each operation button. It has great practical value, such as being able to provide it at a low price.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of a push-button time switch according to an embodiment of the present invention, and Figs. 2 and 3 are explanatory diagrams of the push-button time switch. show. FIG. 4 is a view taken along the - line in FIG. 2. 1... AC power supply, 2... Load, 3... Power switch, 4... CR timer, 13a, 13b, 1
3c... Time constant selection switch, 19... Push button switch, 20a, 20b, 20c... Operation button, 2
5... Interlocking plate, 17... Electromagnet (electromagnetic locking means).

Claims (1)

[Claims] 1 A CR timer circuit connected in parallel to a load connected in series to an AC power source via a power switch and provided with a plurality of time constant selection switches, and closed by pressing each of the time constant selection switches. The operation buttons are arranged as shown in FIG. and means for releasing the locking state of the interlocking plate by a signal output from a CR timer circuit after a period of time, and the interlocking plate slides and locks, thereby pressing the power switch to close the power switch. Expression time switch.