JPS6041959B2 - rechargeable electric razor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rechargeable electric shaver, and its object is to provide a rechargeable electric shaver that can prevent explosion even if gas released from the safety valve of the storage battery diffuses into the housing. Our goal is to provide electric razors.

Generally, a rechargeable electric shaver has a built-in storage battery made of a nickel-cadmium battery, and can be used repeatedly without replacing the battery by appropriately charging the shaver.

However, when this type of storage battery is reverse charged, overcharged during rapid charging, or charged at extremely low temperatures, a large amount of gas (oxygen gas and hydrogen gas) is generated inside the storage battery due to charge/discharge reactions. . The charge/discharge reaction and gas production reaction are as follows. <Charge/discharge reaction><Discharge>2N100H+Cd+H2O;Go<Charge> 2N1(O)I)2+Cd(OH)2 <Gas generation reaction> Anode 2OH-→11200↑+H.

O+2 one cathode river. O+2-→Ho↑+20H However,
When the reactions at the anode and cathode are combined, H2O→L↑+11202↑, which is a so-called water electrolysis reaction, generates H, gas, and O2 gas at a ratio of 2:1.

The above gas generation reaction does not occur under normal charging conditions, but if a storage battery is charged using the incorrect charging method described above, a large amount of gas will be generated due to the gas generation reaction, causing the internal gas pressure of the storage battery to rise abnormally. , there is a risk that the storage battery will explode.
Therefore, storage batteries are equipped with a safety valve that opens when the internal gas pressure reaches an abnormally high level, and releases a large amount of generated gas to the outside as appropriate to prevent the internal gas pressure from exceeding a certain level. ing. Incidentally, in the case of this type of rechargeable electric shaver, the storage battery and commutator motor are often housed in a sealed cylindrical housing to make them waterproof. When stored in a sealed housing, if the safety valve of the storage battery operates as described above and the gas generated within the storage battery is released, explosive gas (H2 gas explosive concentration range) may be released inside the housing. (4-75%)
There was a danger that the sparks (arc) generated by the commutator of the commutator motor would ignite the gas and cause an explosion.

The present invention has been made in view of the above points, and will be described below with reference to the drawings showing embodiments of the present invention.

In FIGS. 1 to 5, a housing 1 is made of a synthetic resin material, and is formed into a cylindrical shape having a side opening 2 at one end and a lower opening 3 at the other end. Opening 2
A razor head 5 is attached to the lower opening 3 via an O-ring 4, and a bottom cover 6 is screwed to the lower opening 3 via an O-ring 7 with a screw 8, thereby forming a housing with a sealed structure. Side covers 9 are provided on both sides of the housing 1.
, 10, a switch handle 12 having a lock button 11 is slidably attached to the upper part of the first side cover 9, and a magnet 13 provided on the back side of the switch handle 12 and a housing are provided. A reed switch 14 disposed within the power supply switch 1 constitutes a power switch 15. Magnet 13, reed switch 14 and power switch 15
By configuring this, the occurrence of sparks is prevented, and by arranging the reed switch 14 inside the housing 1, the housing 1 is made waterproof. The razor head 5 has a motor mount 18 to which a commutator motor 16 is screwed and is screwed into the side opening 2 with a screw 17, and an opening 19 in the circumferential body, and is rotatable to the motor mount 18. It has a flushing ring 20 that can be freely fitted loosely, a screw 21 for attaching an outer blade, an opening 22 that matches the opening 19 of the flushing ring 20, and is screwed onto the motor mounting base 18 with a screw 23. The commutator motor 16 is made up of an outer blade mounting base 24, an inner blade 27 in which an inner blade 26 is bored in a base 25, and an outer blade 29 in which a number of blade holes 28 are bored. rotation axis 3
The rotary shaft 30 of the commutator motor 16 is connected to the inner cutter 27 through a joint 32 that protrudes from the motor mount 18 through an O-ring 31 and is fitted onto the rotary shaft 30. In the embodiment, water is introduced into the beard reservoir chamber 33 by aligning the opening 19 of the flushing ring 20 with the opening 22 of the outer blade mount 24 and placing the razor head 5 into the water.
After that, the power switch 15 is turned on and the inner blade 27 is rotated to wash away the beard debris in the beard storage chamber 33. Therefore, it is necessary to watertightly isolate the beard storage chamber 33 from the inside of the housing 1. There is. The battery block 34 includes an anode terminal 37 connected to an anode 36 of a storage battery 35 that supplies current to the commutator motor 16;
a first motor connection fitting 39 connected to the anode terminal 16a of the commutator motor 16;
, a second terminal connected to the anode terminal 16b of the commutator motor 16
Motor connection fittings 40, commutator motor 16 and storage battery 35
It is composed of a sealing means 41 interposed between the commutator motor 16 and the storage battery 35 to separate the commutator motor 16 and the storage battery 35, and a battery holder 43 to which a switch connection fitting 42 is attached. A first motor contact fitting 39 that contacts the anode terminal 16a of the motor 16 and a second motor contact fitting 40 that contacts the cathode terminal 16b of the commutator motor 16 are protruded, and the battery block 3
4 is attached to the housing 1, the first motor contact fitting 39 comes into contact with the anode terminal 16a of the commutator motor 16, and the second motor contact terminal 40 comes into contact with the cathode terminal 16b of the commutator motor 16. The anode 36 of the storage battery 35 is attached to the recess 44 of the battery holder 43 so as to face the other end of the battery holder, and is housed in the housing 1. A safety valve 45 is provided at the anode 36 of the storage battery 35. The cap 46 is made of rubber, is attached to the anode side end of the storage battery 35, and surrounds the safety valve 45.
This prevents the gas released from the housing 1 from diffusing into the housing 1. The sealing means 41 is made of rubber, and has a protrusion 47 for fixing the sealing means on the battery hole 43.
A first opening 48 is inserted into the housing 1, a second opening 50 is inserted into which a catalyst 49 for converting gas into water is inserted, and an elastic piece 51 is formed that protrudes along the entire circumferential direction of the inner wall in the housing 1. battery holder 4 to which a sealing means 41 is fixed
3 is attached to the housing 1, the housing 1 is installed so that the gas generated from the storage battery 35 does not reach the commutator motor 16.
An elastic piece 51 is tightly attached to the entire circumference of the inner wall. The bottom cover 6 is provided with a printed circuit board 53 on which an electronic component 52 is mounted, and a terminal pin 54 for power supply. The valve 55 includes a valve stem 58 that is pressed by a protrusion 57 formed on the charger 56, an O-ring 59 that is inserted into the valve stem 58, a spring body 60 that presses the valve stem 58 outward, and a spring body. Support plate 61 supporting 60
It is arranged in parallel with the terminal pin 54 and is movable in the bottom cover 6, and when the electric shaver is connected to the charger 56 and charged, the protrusion 57 of the charger 56 closes the valve 55. is opened and the gas released from between the storage battery 35 and the cap 46 is released to the outside of the housing. In the rechargeable electric shaver according to the present invention, the commutator motor, which is the ignition source, and the storage battery, which is the gas generation source, are separated by a sealing means, so that the sparks from the commutator motor do not ignite the gas, thereby preventing an explosion. This has the effect of providing a safe rechargeable electric razor without any danger.

In addition, the end of the battery holder to which the storage battery is attached is provided with a sealing means that protrudes along the entire circumference of the inner wall of the housing, so by attaching the battery holder to the housing, the sealing means can be easily and reliably applied to the entire inner wall of the housing. This has the effect of allowing close contact. Furthermore, since a pair of motor contact fittings protruding in the direction of the commutator motor are provided at the end of the battery holder to which the storage battery is attached, the commutator motor and the storage battery can be connected by attaching the battery holder to the housing. This has the effect of eliminating the need for connections using lead wires or the like, making assembly easier.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an external perspective view of a rechargeable electric shaver and a charger, FIG. 2 is a vertical cross-sectional view of the rechargeable electric shaver, and FIG. 3 is a main part of the electric shaver. Fig. 4 is an exploded perspective view of the electric shaver head; Fig. 5 is a partial sectional view;
The figure is an exploded perspective view of the main parts of the electric shaver. 1...Housing, 16...Commutator motor, 16a, 16b...Commutator motor terminal, 25...Inner blade, 29...Outer blade , 35...
・Storage battery, 39, 40...Motor contact terminal, 4
1...Sealing means, 43...Battery holder.

Claims (1)

[Claims] 1. Attach an outer cutter having a large number of blade holes, an inner cutter that slides into contact with the inner surface of the outer cutter, a commutator motor that drives the inner cutter, a storage battery that serves as a power source for the commutator motor, and the storage battery. a battery holder, a cylindrical housing for accommodating the commutator motor, the storage battery, and the battery holder, and a sealing means protruding toward the entire circumferential direction of the inner wall of the housing at an end of the battery holder; A pair of motor contact fittings protruding in the direction are provided, and when the battery holder is attached to the housing, the commutator motor and the storage battery are separated via the sealing means, and the motor contact fittings are connected to the terminals of the commutator motor. A rechargeable electric razor characterized by being able to be contacted freely.