JPH07308464A - Rotary type electric razor - Google Patents

Abstract

PURPOSE:To prolong the service life of an outer blade by preventing the outer blade from being worn by suppressing the vibrations of an inner blade in the rotary type electric razor. CONSTITUTION:One end part of the main body 21 of this rotary type electric razor is opened and an inner blade body housing chamber 22 housing an inner blade body 27 to be rotated by a motor 23 is provided inside the opening, and the opening is closed by an outer blade body 26. In such a razor, the outer blade is prevented from being abnormally worn by suppressing the vibrations of an inner blade 29 by providing a damping member (damper) 31 at a base part 29a of the inner blade 29 provided at the inner blade body 27 in freely slidable manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric shaver and, more particularly, to suppressing vibration of an inner blade provided on an inner blade of the electric shaver to prolong the life of the outer blade.

[0002]

2. Description of the Related Art Conventionally known rotary electric razors generally have an inner blade housing chamber having an opening at one end in an electric razor body, and an outer blade having an outer blade having a large number of beard introducing holes formed therein. The output shaft of the motor provided inside the main body is projected into the inner blade body storage chamber while the body is closed, and the inner blade body having the inner blade slidably contacting the inner surface of the outer blade is detachably attached to the output shaft. The structure is attached.

As shown in FIG. 5, the inner blade A is arranged on the inner blade base 1 around a rotation center axis thereof, that is, around a shaft hole 2 engaging with the output shaft of the motor. A through hole 3 and a spring mounting portion 4 are formed, and the through hole 3 has
A base portion 5a slidably inserted into the through hole 3 is provided, and a blade portion 5b is provided at one end portion and a blade portion 5b is provided at the other end portion of the base portion 5a which is located on the outer blade 7 side (shown by a chain double-dashed line). The inner blade 5 having the spring insertion hole 5c is inserted therein. Then, the spring insertion hole 5c has a structure in which one end of the spring 6 fixed to the spring attachment portion 4 is inserted into the spring insertion hole 5c.

The inner blade 5 rotates while slidingly contacting the inner surface of the outer blade 7 in accordance with the rotation of the motor provided in the main body, and shaving is performed.

[0005]

As described above, in the conventional inner blade A of the rotary electric shaver, the inner blade 5 is simply supported by the spring 6 while being urged toward the outer blade 7. Since it is not fixed to the inner blade base A by itself, it is movably supported in the through hole 3 along the penetrating direction, that is, in the vertical direction in the figure, during use, that is, when the inner blade body A is rotating. ing. On the other hand, since a large number of whisker introduction holes are formed in the outer blade 7, when the inner blade body A rotates, the inner blade 5
The coefficient of friction between the blade portion 5b and the inner surface of the outer blade 7 changes every moment. This change in the friction coefficient, that is, the change in the frictional force causes the inner blade 5 to vibrate. In order to prevent this vibration, lubricating oil is usually applied to the blade portion 5b of the inner blade 5 and the outer blade 7,
As it is used repeatedly, it disappears along with the beard scraps, making it impossible to make a smooth sliding contact and causing vibration. In addition, the oil and fat secreted from the skin may act as a lubricant during use, but there are individual differences in this, and the oil and fat may be washed off after washing the face. Is insufficient, which causes vibration of the inner blade 5 during use.

When the above-mentioned vibration occurs, the inner blade 5 may cause a phenomenon similar to a resonance phenomenon called a stick slip phenomenon during rotation. When this stick-slip phenomenon occurs, the blade portion 5b cannot move while smoothly sliding in contact with the inner surface of the outer blade 7, but moves in a skipped state, causing abnormal wear on the inner surface of the outer blade 7. Then, once the abnormal wear occurs, the stick-slip phenomenon is further promoted due to the abnormal wear, and the abnormal wear is promoted.

When the above-mentioned stick-slip phenomenon and abnormal wear of the inner surface of the outer blade 7 occur, the blade portion 5b cannot rotate while being in pressure contact with the outer blade 7, so that there is a gap between the blade portion 5b and the inner surface of the outer blade 7. There is also a problem that good shaving cannot be performed due to the occurrence of shaving.

Further, when the stick-slip phenomenon occurs, the inner blade 5 vibrates, so that the spring 6 inserted in the spring insertion hole 5c of the inner blade 5 receives a shock due to the vibration, and as a result, the hole edge of the spring insertion hole 5c. There is a problem that the portion of the spring 6 that comes into contact with the tire is fatigued and broken from this portion.

[0009]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems of the prior art, and has a main body having an inner blade body storage chamber having one end opened, and an outer blade body attached to the main body so as to cover the opening. And a motor provided in the main body, the output shaft of which protrudes from the bottom of the inner blade body storage chamber, and an output shaft of the motor, which is detachably mounted around the rotation center axis of the motor. An inner blade base having a plurality of through holes penetrating along it, a base portion slidably inserted into the through hole, and an inner surface of the outer blade body at one end side of the base portion located on the outer blade body side. An inner blade having a blade portion slidably contacting with the elastic body engaging portion on the other end side, and an inner blade having one end attached to the inner blade base and the other end engaging with the elastic body engaging portion. An elastic body for urging the inner blade toward the outer blade, and a control member provided at the base of the inner blade. It has a structure of the rotary electric shaver comprising a body.

[0010]

Since the present invention is configured as described above, the vibration of the inner blade is suppressed by the vibration damping member during the rotation of the inner blade to prevent the occurrence of the stick-slip phenomenon, thereby preventing the abnormal wear of the outer blade. As a result, the life of the outer blade can be extended. Further, it is possible to prevent vibration of the inner blade caused by the stick-slip phenomenon and prevent breakage of the spring urging the inner blade.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 21 is a main body of a rotary electric shaver, and an inner blade body storage chamber 22 having one end (upper side in FIG. 1) opened is formed in the main body 21. The output shaft 24 of the motor 23 mounted inside projects. This output shaft 24
An engaging projection 25 is attached to the. The opening of the inner blade body storage chamber 22 is closed by an outer blade body 26 attached to the main body 21. Then, the outer blade body 26
Is composed of an outer blade frame 26b attached to the main body 21 and an outer blade 26a integrally attached to the outer blade frame 26b and having a large number of beard introducing holes (not shown).

Next, the inner blade shown by reference numeral 27 will be described. The inner blade body 27 is composed of an inner blade base 28 described later, an inner blade 29 attached to the inner blade base 28, and a spring 30 as an elastic body. The inner blade base 28 is provided with an engagement shaft 28b that is formed with an engagement hole 28a that protrudes downward in FIG. 1 and that engages with the engagement projection 25. By the engagement of the engagement hole 28a of the engagement shaft 28b with the engagement projection 25, the inner blade 27 is rotated in the inner blade storage chamber 22 according to the rotation of the motor 23.

A through hole 28 is formed in the inner blade base 28 around the engaging shaft 28b and in parallel with the shaft center.
A plurality of c (three not shown) are formed, and a spring attachment portion 28d for attaching one end of the spring 30 is formed in the vicinity of the through hole 28c on the back surface side thereof. One end of the spring 30 is attached to the spring attaching portion 28d, and the other end is an inner blade 2 described later.
9 is inserted into the spring mounting hole 29d and the inner blade 29 is inserted into the outer blade 26a.
Is urged toward the inside.

Next, the inner blade 29 is formed on a base portion 29a slidably inserted into the through hole 28c of the inner blade base 28 and one end side of the base portion 29a located on the outer blade body 26 side. A blade portion 29c, and a base portion 29
A spring mounting hole 29d as an elastic body engaging portion into which the other end of the spring 30 is inserted is formed in the vicinity of the bottom end of the inner blade storage chamber 22 of a.

When the other end of the spring 30 is inserted into the spring attachment hole 29d of the inner blade 29 inserted into the through hole 28c of the inner blade base 28, the spring 30 is urged by the urging force as described above. The inner blade 29 is urged upward, that is, in the direction of the outer blade 26a, and the blade portion 29c is in pressure contact with the inner surface of the outer blade 26a. When the inner blade body 27 rotates, the blade portion 29c is in pressure contact with the inner surface of the outer blade 26a. While rotating.

A damping member 31 as a damping body is integrally attached to the base portion 29a of the inner blade 29. By providing the vibration damping member 31, the vibration damping, that is, the inner blade 29
The vibration is suppressed by the fact that the damping member 31 increases the mass of the entire inner blade 29 including the damping member 31 and changes the resonance point defined by the spring 30. To be

Therefore, at the same rotational speed, this resonance point changes either the total mass of the inner blade 29 and the spring 30 or the elastic coefficient of the spring 30 in the system composed of the inner blade 29 and the spring 30. The mass of the inner blade and the spring in this type of rotary razor is extremely small, and in the situation where the elastic modulus of the spring is also small, the mass of the inner blade 29 should be increased. Was confirmed to be the most effective by the inventor.

As shown in FIG. 2, the damping member 31 surrounds one end of the base portion 29a of the inner blade 29, that is, the distal end side in the insertion direction into the through hole 28c, and is integrally formed of a thermoplastic resin. ing. The thickness of the material surrounding the base portion 29a of the vibration damping member 31 is adjusted from the insertion hole 28c to the vibration damping member 3
The thickness is such that 1 can be inserted in the state of being integrally molded with the base portion. In FIG. 1, 32 is a storage battery that supplies electric power to the motor 23, and 33 is a plug device connected to a charging circuit (not shown) for charging the storage battery 32.

Since the above embodiment is constructed as described above,
Even if the inner blade 27 rotates during use, that is, when the shaving is performed, the vibration of the inner blade 29 is suppressed by the vibration damping member 31, so abnormal wear of the outer blade 26a due to the sock slip phenomenon can be prevented, and good shaving is achieved. It can be performed.

Next, another embodiment of the vibration damping member 31 is shown in FIG. In the other embodiment, the damping member 31 is formed integrally with the base portion 29a so as to surround the end portion of the base portion 29a, and the damping member 31 and the base portion 29a are formed.
The spring insertion hole 29d is formed in both of them.
In this case, since the length of the spring insertion hole 29d becomes long and the portion in contact with the spring 30 becomes large, breakage of the spring 30 can be prevented.

Further, as shown in FIG. 4, the damping member 31 is extended from the end of the base portion and formed of resin so that the insertion hole 29d is formed only in the damping member 31 and not in the base portion 29d. You can also do it. In this case, since the portion contacting the spring 30 is made of resin instead of metal, the breakage prevention effect of the spring 30 is further improved.

Further, the damping member 31 is not limited to the resin, but may be formed of a metal piece and fixed to the base portion 29a by spot welding. The point is to increase the mass of the inner blade 29.

When the metal piece is used as the vibration damping member, there is an effect that the mass of the inner blade can be increased with the small piece. Also, FIG.
When the vibration damping member 31 is formed to extend from the end of the base as shown in FIG. 1, the center of gravity of the entire inner blade body is located downward in FIG. 1, which is advantageous in that the inner blade rotates stably. .

[0024]

Since the present invention is constructed as described above,
The vibration suppressor suppresses the occurrence of stick-slip phenomenon of the inner blade during rotation of the inner blade, prevents abnormal wear of the outer blade, and prolongs the life of the outer blade. Further, since the inner blade always rotates while being in pressure contact with the inner surface of the outer blade, it is possible to achieve an effect that good shaving can be performed.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a rotary electric shaver according to the present invention.

2A and 2B are views showing an embodiment of an inner blade to which a vibration damper of the present invention is attached, FIG. 2A is a plan view thereof, and FIG. 2B is a sectional view taken along line XX in FIG.

3A and 3B are views showing an embodiment of the inner blade to which the vibration damper of the present invention is attached, FIG. 3A is a plan view thereof, and FIG. 3B is a sectional view taken along line YY in FIG.

FIG. 4 is a sectional view showing another embodiment of the inner blade to which the vibration damper of the present invention is attached.

FIG. 5 is a sectional view of an inner blade of a conventional electric shaver.

[Explanation of symbols]

 21 Main Body 22 Inner Blade Storage Chamber 23 Motor 24 Output Shaft 27 Inner Blade 28 Inner Blade Base 28c Through Hole 29 Inner Blade 29a Inner Blade Base 29b Inner Blade Blade 29c Inner Blade Blade 29d Spring Mounting Hole (Elasticity) Body engaging part) 30 Spring (elastic body) 31 Damping member (body)

Claims (2)

[Claims] 1. A main body having an inner blade body storage chamber having one end opened, and an outer blade body attached to the main body so as to cover the opening.
A motor provided in the main body, the output shaft of which protrudes from the bottom of the inner blade housing chamber, and an output shaft of the motor, which is detachably attached to the output shaft of the motor along the rotation center axis direction. An inner blade base having a plurality of through holes penetrating therethrough, a base portion slidably inserted into the through hole, and an inner surface of the outer blade body on one end side of the base portion located on the outer blade body side. An inner blade having a blade portion in contact therewith and an elastic body engaging portion provided on the other end side, and one end attached to the inner blade base and the other end engaging the elastic body engaging portion to form the inner blade. A rotary electric shaver, comprising: an elastic body that urges toward an outer blade body; and a vibration damping body that is provided at a base portion of the inner blade. 2. The rotary electric shaver according to claim 1, wherein the elastic body engaging portion is formed on a vibration damping body provided on a base portion of the inner blade.