JPH0217192B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rechargeable electric shaver with a built-in storage battery in the main body case, and a means for releasing gas generated from the storage battery due to overcharging to the outside of the main body case. Has characteristics.

[Conventional technology]

In this type of storage battery, gas is generated internally during overcharging, so a safety valve is provided at the positive terminal to release gas to the outside when internal gas pressure increases.

On the other hand, sealed rechargeable electric shavers with a storage battery sealed inside the main body case are becoming popular in order to enable washing with water.

[Problem to be solved by the invention]

In such a sealed rechargeable electric shaver,
If the gas (hydrogen gas) released from the storage battery diffuses and fills the main body case, there is a risk of a gas explosion.
In addition, the main body case may become deformed due to the increase in internal pressure,
Furthermore, the gas and the electrolyte released together with the gas cause problems such as corrosion of other electrical parts and contact failure.

The present invention has focused on this fact, and aims to provide a rechargeable electric shaver that eliminates the above-mentioned problems by directly discharging the gas emitted from the storage battery to the outside of the main body case without diffusing it inside the main body case. be.

[Means to solve the problem]

The present invention provides a rechargeable electric shaver in which a storage battery 4 is hermetically built into a main body case 1.
On the side, there is a crown part 9 that is fitted tightly around at least the outer periphery of the part of the storage battery 4 having the safety valve for gas release, and a thin crown part 9 for releasing the gas in the crown part 9 to the outside of the main case 1. A gas discharge cylinder part 10 having a gas passage 12 is provided, and the tip of the gas discharge cylinder part 10 is exposed to a part of the outer surface of the main body case 1.

[Operation] The gas released from the gas release safety valve of the storage battery 4 is inside the crown portion 9 and is not diffused into the main body case 1. The gas within this crown portion 9 is directly discharged to the outside of the main body case 1 via a gas discharge cylinder portion 10 communicating therewith.

〔Example〕

The drawing shows an example of a rechargeable electric shaver according to the present invention, in which a body case 1 is made of plastic and has a sealed structure. The inner blade 3 that is in contact with the inner blade 3 is attached, and inside the main body case 1, although not shown, there is a drive mechanism for driving the inner blade 3, a driving motor for this, a storage battery 4 such as a nickel-cadmium alkaline storage battery, and a storage battery at the output end. It has a built-in charger that connects to 4.

The bottom of the main body case 1 is provided with an insertion connection part 6 into which a plug 5 as a charging member connected to a commercial power source is inserted. The plug-in connection part 6 has a recess 7 formed in the bottom wall of the main body case 1, and protrudes charging power supply pins 8, 8 through the inner inner wall of the recess 7. This is a standard specification connected to the input terminal of the charger.

In such a rechargeable electric shaver, a storage battery 4
A gas venting member is provided on the storage battery 4 side to directly discharge gas emitted from the main body case 1 to the outside. The gas venting member shown in the figure is an elastic cap 11 that is entirely funnel-shaped and made of a rubber material or the like, and has a crown part 9 and a gas discharge cylinder part 10 that is formed by squeezing a part of the crown part 9 and projects as one body. It is configured. A narrow gas passage 12 is formed in the gas discharge cylinder part 10, passing through the inside and outside of the crown part.

This elastic cap 11 uses its own elasticity to cover the crown part 9 so as to tightly surround the outer periphery of the portion of the storage battery 4 having the safety valve for gas release (i.e., the positive electrode terminal part 13), A protrusion 14 formed on the inner periphery of the end is fitted and locked in an existing circumferential groove 15 near the positive electrode terminal on the outer periphery of the storage battery 4 in a manner that prevents it from coming off.

In this manner, with the elastic cap 11 integrally attached to the storage battery 4 in advance, the storage battery 4 is attached to the main body case 1.
It will be installed inside. At this time, a bulging large-diameter portion 16 is formed on the outer periphery of the middle part of the gas discharge cylinder 10, and a hole 17 is made in the inner back wall of the recess 7, so that the tip of the gas discharge cylinder 10 is bulged. The large diameter portion 16 is inserted into the hole 17 until it comes into contact with the inner wall of the recess 7. The tip of the gas discharge tube 10 now faces the outside of the main body case.

The gap between the gas discharge tube 10 and the hole 17 is sealed with a sealing material 18 to prevent water from entering the case. This sealing material 18 is not particularly required, and waterproofness can be achieved by simply connecting two large-diameter bulging portions 16 like a gourd and elastically engaging the constricted portions with the holes 17 of the main body case 1. Can be maintained.

Lead wire 19 from positive terminal 13 of storage battery 4
The cap 9 is led out either by passing through a part of the crown 9 or, as shown in the figure, between the joint surface between the circumferential surface of the storage battery 4 and the crown 9 attached thereto.

In this case, gas released from the gas release safety valve of the positive terminal 13 of the storage battery 4 due to overcharging, etc., accumulates inside the crown 9, and when the internal pressure of the crown 9 increases, the gas in the gas release cylinder 10 is released. It is directly discharged to the outside of the main body case 1 through the passage 12.

The gas passage 12 of the gas discharge tube 10 facing the outside of the main body case 1 is formed to be as small as possible within the range that allows gas to be released, so even when the electric shaver is washed with water or soap is used, gas passage 1
There is no risk of water entering the main body case through 2. In order to more completely prevent water from entering from outside the case, the gas passage 12 is tightly closed by the elasticity of the gas discharge tube 10 itself under normal conditions, and gas pressure is applied to the gas passage for the first time when gas is discharged. 1
2 should expand and expand to allow gas to pass through.

If the tip of the gas discharge tube 10 faces the recess 7 as shown in the illustrated example, it can be effectively protected from foreign objects, but the tip is not limited to this, and the tip can be exposed to other outer surfaces of the main body case 1. Gas discharge cylinder part 10 in part
It is also possible to have the tip of the

Further, the crown portion 9 may be configured to cover not only the positive terminal portion 13 of the storage battery 4 but also the entire storage battery 4.

〔Effect of the invention〕

As explained above, according to the present invention, the gas generated from the storage battery 4 due to overcharging, etc. is once released to the crown part 9 placed around at least the gas release safety valve on the storage battery 4 side, and then released into the gas release tube. Part 1
0 directly to the outside of the main body case 1.
Therefore, the gas emitted from the storage battery 4 will not diffuse into the main body case 1, causing not only a gas explosion but also deformation of various parts of the main body case due to an increase in internal pressure.
It can completely prevent corrosion of electrical parts and poor contacts.

In addition, since the crown part 9 and the gas discharge cylinder part 10 are respectively provided on the side of the storage battery 4, these parts are assembled into one assembly in the main body case 1.
It is possible to check the gas release performance through the gas release safety valve on the storage battery 4 side at the component stage, and to obtain a product with high reliability in this respect. Furthermore, since the storage battery 4 side is provided with a crown part 9 and a gas discharge cylinder part 10, unlike a method in which these two parts 9 and 10 are connected at the time of assembly, gas leakage at the connection part can be prevented and assembly can be easily performed. It also has the advantage of good workability.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view illustrating a rechargeable electric shaver according to the present invention, and FIG. 2 is an enlarged longitudinal sectional front view of the main parts thereof. 1...Body case, 2...Outer blade, 3...Inner blade,
4... Storage battery, 7... Recessed part, 9... Crown part, 10...
...Gas discharge tube part, 11...Elastic cap, 12...
...Gas passage, 17...hole.

Claims (1)

[Scope of Claims] 1. In a rechargeable electric shaver in which a storage battery 4 is hermetically built into a main body case 1, the outer periphery of at least a portion of the storage battery 4 having a safety valve for gas release is surrounded on the side of the storage battery 4 in a tight fit. A crown part 9 that can be fitted over the crown part 9 and a gas discharge cylinder part 10 having a narrow gas passage 12 for discharging the gas inside the crown part 9 to the outside of the main body case 1 are respectively provided. A rechargeable electric razor characterized by having a tip facing a part of the outer surface of a main body case 1.