JPH0435977B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small electric device that is switchably equipped with a main battery and an auxiliary battery.

[Prior Art] Conventionally, an auxiliary battery is provided in addition to a main battery as a battery for driving a load, and when it is confirmed that the main battery has run out of capacity, the drive source for the load can be switched to the auxiliary battery. As a result, attempts have been proposed to prevent devices from becoming inoperable during use.

[Problems to be Solved by the Invention] However, in the above-mentioned configuration, since either the main battery or the auxiliary battery is simply selected alternatively, it is possible to mistakenly start using the auxiliary battery. This inevitably led to the problem that the auxiliary battery would run out first and would no longer function as a supplement to the main battery.

The present invention has been made in view of this problem, and it is an object of the present invention to provide a small electric device that prevents the misuse of an auxiliary battery.

[Means for Solving the Problems] The small electric device according to the present invention supplies power to the load 5 through the main battery 11 side and then through the auxiliary battery 12.
It is characterized by being equipped with a switch 9 that allows switching to the side.

The above-mentioned switch 9 is a sliding type equipped with an operation knob 10, and along the sliding direction of this operation knob 10, the off position of the load 5 with respect to the power supply section 6, the connection position with the main battery 11, and the auxiliary battery It is possible to set the connection positions to 12 in this order.

[Function] With the above configuration, in conjunction with the switching operation of the switch 9, the load 5 is first connected to the main battery 11 side from the off state, and driving power is supplied from the main battery 11 to the load 5.

If it is confirmed that the main battery 11 has run out of capacity, if the switch 9 is operated further,
The power is switched to the auxiliary battery 12 side, and driving power is subsequently supplied from the auxiliary battery 12 to the load 5.

[Example] An example in which the present invention is applied to a reciprocating electric shaver is shown below, but the present invention is not limited to this, and may be applied to a rotary electric shaver, an electric hair clipper, a tape winder, a flashlight, etc. Of course, the present invention can also be applied to various small electric devices using rechargeable batteries in substantially the same way.

As shown in FIGS. 1 and 2, an electric shaver 1 embodying the present invention is provided with an outer cutter 3 that is removably attached to the upper part of a main body case 2, and an inner cutter 4 that is inscribed in the outer cutter 3. are arranged so that they can move freely back and forth.

Furthermore, inside the main body case 2, a load 5 such as a motor that reciprocates the inner cutter 4, a power supply section 6 that supplies power to the load 5, and a charging section 7 that charges the power supply section 6 are built in. In conjunction with the sliding operation of the operation knob 10 of the switch 9 provided on the front side of the main body case 2, the timing of energization from the power source section 6 to the load 5 can be regulated.

The power supply section 6 is a secondary battery such as a nickel cadmium battery that can withstand multiple charging and discharging operations, and has two AA-type main batteries 11 having different battery capacities, for example, a capacity of about 400 to 500 mAh, and a 50 mAh secondary battery. ~10
AA auxiliary battery 1 with a capacity of about 0mAh
2 are used as one set.

The charging part 7 has a plug blade 1 at the base end of the main body case 2.
3 that can appear and retract freely, and after rectifying the commercial AC power 14 input through the plug blade 13 in the rectifier circuit 15, the inverter circuit 16
By converting the voltage into a pulse-like voltage with a frequency of about
1 and 12 can be charged at the same time.

The main battery 11 and the auxiliary battery 12 charged by the charging section 7 are each switched and connected to both ends of the load 5 via a switch 9 .

When the operating knob 10 is at the lower limit position shown in FIG. 1, the switch 9 switches the switch piece 21 as shown in FIG.
is in an OFF state in which it does not make contact with either the first contact 22 or the second contact 23, but when the operating knob 10 is pushed upward one step, the switch piece 21 moves to the first contact 22 side as shown in FIG. When the operating knob 10 is pushed upward one more step, the switch piece 21 is moved to the second contact point 23 as shown in FIG. 3b.
It is configured to switch to the side. Therefore, by connecting the first contact 22 of the switch 9 to the positive pole of the main battery 11 and the second contact 23 to the positive pole of the auxiliary battery 12, and connecting the switch piece 21 to the load 5 side, the operating knob 10 In conjunction with the slide operation, the power supply to the load 5 is switched from the off state to the main battery 11 side and then to the auxiliary battery 12 side.

The display section 24 is formed by connecting a light emitting diode 26 and a resistor 27 for overcurrent prevention in series, and is connected to both ends of the main battery 11 via a switch contact 29. The switch contact 29 turns on and off in conjunction with the sliding operation of the operation knob 10 of the switch 9 described above, and remains off while the load 5 is de-energized or is driven by the main battery 11. As shown in FIG. 3B, it is turned on only when the drive source of the load 5 is switched from the main battery 11 side to the auxiliary battery 12 side. That is, when the load 5 is not being driven or is in a steady state where power is being supplied from the main battery 11, the display section 24 is separated from the power supply section 6 and does not perform any light emitting display.

However, when the operation knob 10 of the switch 9 was advanced one step from the lower limit OFF position and the main battery 11 and the load 5 were connected, the power stored in the main battery 11 was used up and the rotational drive of the load 5 stopped. When this is confirmed, move the operating knob 10 of the switch 9 one step further to switch the switch piece 21 from the first contact 22 side to the second contact 23 side, the main battery 11 is disconnected from the load 5, and the main battery 11 is disconnected from the load 5, and the next time Power is supplied from the auxiliary battery 12 to the load 5, allowing the load 5 to continue to be driven without any problems. At the same time,
The switch contact 29 is closed, both ends of the display section 24 are connected to the main battery 11, and the power remaining in the main battery 11 is used to energize the light emitting diode 26 of the display section 24 to perform a light-emitting display. It shows that it is in use.

Note that both the main battery 11 and the auxiliary battery 12 may be constructed of dry batteries, and it is also possible to make the battery capacities the same.

Furthermore, the display section 24 may be provided with means for blinking the light emitting diode 26.

[Effects of the Invention] As described above, the present invention is configured such that the order in which power is supplied to the load 5 by operating the switch 9 from the OFF state is always switched to the main battery 11 side and then to the auxiliary battery 12 side. This prevents the auxiliary battery 12 from being used up before the main battery 11 by mistake.

Furthermore, the switch 9 is a sliding type equipped with an operating knob 10, and the off position of the load 5, the connecting position to the main battery 11, and the connecting position to the auxiliary battery 12 are arranged in that order along the sliding direction of the operating knob 10. Since the setting is made in , a reliable switching operation can be performed with a relatively simple configuration.

[Brief explanation of drawings]

1 to 3 show an example of an electric shaver in which the present invention is applied. FIG. 1 is a perspective view showing the external shape, FIG. 2 is an electric circuit diagram, and FIGS. It is an explanatory diagram showing an operating state. 5...Load, 6...Power supply section, 7...Charging section, 9
...Switch, 10...Operation knob, 11...Main battery, 12...Auxiliary battery.

Claims (1)

[Scope of Claims] 1. A power supply unit 6 having a main battery 11 and an auxiliary battery 12; A load 5 driven by the power supply unit 6; Power is supplied to the load 5 through the main battery 11 and then to the auxiliary battery 12 side. The above-mentioned switch 9 is a sliding type equipped with an operation knob 10, and along the sliding direction of this operation knob 10, the load 5 is placed in the OFF position with respect to the power supply unit 6, A small electric device in which the connection position to the main battery 11 and the connection position to the auxiliary battery 12 are set in that order.