JPH0919576A - Electric razor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guarantee better shaving by arranging an inner blade assembly arranged on an inner blade mounting base to be rotated by a motor to be made up of inner blades arranged in plurality along the circular arc of the internal surface of a circular shaving surface with a circular arc-shaped cross section to enable maintaining of closeness between the inner blade and the inner circumferential surface of an outer blade. SOLUTION: An electric razor 1 has a blade block 10 mounted rotatably on a holding member 50 arranged in a support base 40 and the blade block 10 is constituted of a detachable outer blade frame 12 having an outer blade 11 mounted integrally thereon and an outer blade mounting base 13 having an inner blade housing recess part 13a as an inner blade layout part. An inner blade base 15 having a plurality of inner blades 14 kept in sliding contact with the inner circumferential surface of the outer blade 11 while being energized by a spring S is housed into the inner blade housing recess part 13a of the outer blade mounting base 13. The inner blades 14 of the inner blade base 15 each has a base part 14a and a blade body 14b formed on one end side thereof and the blade body 14b is formed in a shape following the internal surface of a circular arc surface of a circular shaving surface 11b of the outer blade 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric shaver, and more particularly to a rotary electric shaver using an outer blade having an annular shaving surface having an arcuate cross section.

[0002]

2. Description of the Related Art Conventionally, an electric shaver using an outer blade having a shape of an annular shaving surface having an arcuate cross section is widely known, and its structure is generally shown in FIG.
That is, as shown in FIG.
01 is formed and the electric motor 102 is provided inside,
The output shaft 103 of the electric motor 102 is projected from the bottom wall of the inner blade mounting portion 101, and the drive shaft 104 is attached to the output shaft 103.
Is attached, and the annular shaving surface 10 has an arcuate cross section.
The outer blade 105 on which the inner blade 5a is formed is inserted through the outer blade case 106 to which the outer blade 105 is integrally attached.
It is attached over 01. An inner blade mount 107 is detachably attached to the drive shaft 104, and the annular shaving surface 1 is attached to the inner blade mount 107.
A plurality of inner blades 108 (only one is shown in the figure) having a blade body 108a formed along the arcuate surface of 05a are movably mounted in the vertical direction in the drawing, and one end of the inner blade 108 is attached to the inner blade mounting base. A spring 109 attached to 107 is pressed against the inner peripheral surface of the annular shaving surface 105a.

When the inner blade mounting base 107 is rotationally driven by the electric motor 102, the blade body 108a of the inner blade 108 rotates while slidingly contacting the inner peripheral surface of the annular shaving surface 105a. The beard introduced from the beard introduction hole formed in 105 is shaved.

By the way, the reason why the outer blade 105 is formed in the shape of the annular shaving surface 105a having an arcuate cross section as described above is that the center portion of the outer blade which is simply formed in a convex spherical shape. Since the inner blade attached to the inner blade mount is generally not provided at the center of rotation of the inner blade mount, the central part of the outer blade is a portion that does not function as a shaving surface, and is, for example, under the nose. At the time of shaving of the recessed part, the central part hits the skin around the recessed part to hinder good shaving, and since the area in contact with the skin becomes wide, the adhesion between the blade surface and the skin is poor. There is a problem that deep shaving cannot be performed, and in order to solve this problem, the outer cutter is formed by recessing the central portion of the outer cutter inward to form the annular shaving surface 105a as described above.

However, when the shaving surface of the outer blade 105 is the annular shaving surface 105a as described above, the outer shaving surface is likely to be deformed when an external force is applied. The shaving surface 105a is deformed, and as a result, the shape of the annular shaving surface 105a of the outer blade 105 is the inner blade 1.
The shape of the blade body 108a of No. 08 does not match, and the inner blade 10
The blade body 108a of 8 separates from the inner surface of the annular shaving surface 105a, and the inner peripheral surface of the annular shaving surface 105a and the inner blade 10
Since the adhesion to the blade portion 108a of No. 8 is deteriorated, there is a problem that the beard introduced from the beard introduction hole is not reliably sheared and good shaving is not performed. In addition, as described above, the outer blade 1
When the ring shaving surface 105a is formed on 05, the outer blade of this type is formed by a processing method called electroforming, so that the shape is caused by the stress applied when peeling from the electroforming mold. The shape may not always be constant due to variations, and the rigidity of the outer blade decreases over a long period of use, and it becomes easy to deform due to the pressing force during shaving. The inner peripheral surface of the annular shaving surface 105a and the blade body 108 of the inner blade 108.
There is a problem that the adhesiveness with a deteriorates and good shaving cannot be performed.

Furthermore, the deformation of the annular shaving surface 105a increases the frictional force between the inner blade 108 and the annular shaving surface 105a, and the increase in this frictional force decreases the rotation speed of the electric motor. There is a problem that the shaving performance is deteriorated and the frictional force is increased, so that the inner blade 108 and the outer blade 105 are abnormally worn.

[0007]

As described above, in the conventional electric razor in which the outer shaving surface is formed with the annular shaving surface having the arcuate cross section, the shaving of the dent portion of the skin can be favorably performed and so-called deep shaving can be performed. Although it has the advantage of being able to
On the other hand, variations in shape tend to occur due to manufacturing,
There are cases where the shape is not always constant, or there is a circumstance that it is easily deformed by external force received from the skin during shaving.Therefore, variations in these shapes or deformation due to external force may result in poor adhesion to the inner blade. There is a problem that shaving can not be satisfactorily damaged, and the shaving performance due to a decrease in the rotation speed of the inner blade due to an increase in the frictional force between the inner blade and the outer blade, and the frictional force However, there is a problem that the inner blade and the outer blade are worn away with the increase of the number of blades and the durability and the shaving performance are deteriorated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to remove the inner peripheral surface of the outer blade and the inner blade even when the outer blade is deformed by the pressing force applied from the skin being the shaving surface during shaving. An object of the present invention is to provide an electric razor that maintains good adhesion and enables good shaving.

[0009]

The present invention is to achieve the above object, and the invention according to claim 1 has a main body having a motor inside and an inner blade disposing portion, and a circular cross section. An outer blade having an annular shaving surface formed in an arc shape and attached to cover the inner blade mounting portion, and an inner blade mounting base disposed in the inner blade mounting portion and driven to rotate by the motor, An inner blade attached to the inner blade mounting base is pressed against the inner surface of the annular shaving surface by an elastic member, and the inner blade mounting base is rotated by the motor to slide the inner blade onto the inner shaving surface. In an electric razor that is rotated while shaving, an electric razor having a plurality of inner blades arranged on the inner blade mounting base is arranged along the inner arc of the annular shaving surface having the arc-shaped cross section. It is a razor, Invention Motomeko 2 described claim 1
In the invention described, a part of the mutually facing sides of the inner blades arranged along the inner arc of the annular shaving surface of the arcuate cross-section of the outer blade are overlapped along the circumferential direction of the annular shaving surface. It is an electric razor provided.

According to the first aspect of the invention configured as described above, even if the outer blade is deformed by the pressing force received from the shaving surface, one of the inner blades arranged along the arc is the outer blade. Good shaving can be achieved by maintaining good adhesion to the inner peripheral surface, and the increase in the frictional force between the inner blade and the inner peripheral surface of the shaving surface due to the deformation can be prevented. Of the inner blade or the outer blade can be prevented from being worn. Further, in addition to the effect of the first aspect, the invention according to the second aspect is introduced from the whisker introduction hole of the outer blade because the inner blades overlap each other in the shaving direction in the circumferential direction of the annular shaving surface. The beard can be sheared reliably and efficiently.

[0011]

FIG. 1 shows an embodiment of the present invention.
A description will be given with reference to FIG. As shown in FIG. 1, an electric razor 1 comprises a front case 2a and a rear case 2b, a main body 2 in which an unillustrated battery, a circuit board and the like are housed, a support base 40 attached to the main body 2, The blade block 10 and the like are rotatably attached to a holding member 50, which will be described later, disposed in the support base 40.

As shown in FIG. 2, the blade block 10 includes an outer blade 1 having a large number of beard introducing holes (not shown) formed therein.
1, an outer blade frame 12 to which 1 is integrally attached, an outer blade mounting base 13 to which the outer blade frame 12 is detachably attached and which has an inner blade housing recess 13a as an inner blade disposing portion, the outer blade 11 The inner blade base 15 is provided with a plurality of inner blades 14 slidably contacting the inner peripheral surface of the outer blade mounting base 13 while being biased by the spring S. The motor mount 20 is attached to the opposite side of the inner blade housing recess 13a, and the motor 30 is mounted on the motor mount 20.

The outer blade 11 is made of a thin metal plate and has a large number of whiskers introducing holes (not shown), and as shown in the drawing, a recess 11a is formed in the center toward the inner blade housing recess 13a. By forming it, an annular shaving surface 11b having an arc-shaped cross section is formed. Further, the outer blade frame 12 is made of synthetic resin and is formed in a substantially cylindrical shape. In the figure, the outer peripheral edge portion of the outer blade 11 is integrally attached to the upper edge portion, and the female screw 12a is attached to the inner peripheral portion. Has been formed.

Next, the outer blade mounting base 13 is formed in a bottomed cylindrical shape having an upper opening in FIG. 2 so as to form the inner blade accommodating recess 13a inside, and the outer peripheral wall of the cylindrical wall 13b is formed. Is formed with a male screw 13c that is screwed into the female screw 12a of the outer cutter frame 12, and a through hole 13e is provided in the center of the bottom wall 13d. In addition, an annular wall 13 extending downward in the drawing continuously from the cylindrical wall 13b.
f is formed, and on the lower side of the bottom wall 13d of the outer cutter mounting base 13, that is, on the side where the annular wall 13f is provided, three protrusions 1 having a convex spherical surface 13g at the tip end are formed.
3h is 3 in the circumferential direction around the axis of the through hole 13e.
They are equidistant, that is, they are provided 120 degrees apart from each other.

Next, the inner blade mounting base 15 is made of synthetic resin in a substantially disk shape, and a fitting hole 15a having a D-shaped cross section is formed in the lower surface side thereof, that is, in the central portion on the inner blade storage recess 13a side. Is provided with a shaft portion 15b, which penetrates in a direction parallel to the central axis of the fitting hole 15a and which has the fitting hole 15b.
The three inner blade mounting holes 15c formed on a circle concentric with a and the inner blade mounting holes 15c adjacent to each other among these three inner blade mounting holes 15c are similarly fitted holes. Three inner blade mounting holes 15d formed on a circle concentric with 15a are formed. The diameter of the circle in which the inner blade mounting hole 15c is formed is set to be larger than the diameter of the circle in which the inner blade mounting hole 15d is formed.

The inner blade mounting holes 15c and 15
The inner blade 14 disposed at d has a base portion 14a as shown in the figure.
On one end side of the base portion 14a, that is, on the outer blade 11 side, the blade body 1
4b is formed, and the shape of the blade body 14b is such that when the inner blade 14 is arranged in the inner blade mounting holes 15c and 15d in a predetermined state, the circular shaving surface 11b of the outer blade 11 is formed into an arc surface. 2 along the inner surface of the circular arc surface, and as shown in FIGS.
The side end portion is formed in a shape slightly exceeding the apex T of the arc surface. Then, as shown in the drawing, among the inner blades 14, the inner blade 14 disposed in the inner blade mounting hole 15c has an inner peripheral surface whose blade body 14b is located outside the apex of the annular shaving surface 11b. The inner blades 14 are mounted so as to be in sliding contact with each other, and the inner blades 14 disposed in the inner blade mounting holes 15d are mounted so as to be in sliding contact with the inner peripheral surface located inside the apex. By setting the positions of the inner blade mounting holes 15c and 15d and the shape of the blade body 14b of the inner blade 14 with respect to the annular shaving surface 11a, the inner blade mounting hole 15 is formed.
When the inner blades 14 are respectively arranged in c and 15d, the inner blades 14 arranged in the inner blade arrangement holes 15c and the inner blade arrangement holes 15 are arranged.
The inner blade 14 disposed at d has its sliding contact loci overlapping with each other around the apex of the annular shaving surface 11a. That is, some of the inner blades 14 on the opposite sides are arranged so as to overlap each other along the circumferential direction of the annular shaving surface.

A spring insertion hole 14c is formed in the base portion 14a of the inner blade 14, and one end is fixed to a spring fixing portion 15e provided in the inner blade mounting base 15 as an elastic body in the spring insertion hole 14c. The other end of the spring S is inserted into the blade body 14b of the inner blade 14 by the spring S.
The annular shaving surface 11b is urged to come into pressure contact with the inner peripheral surface thereof.

Next, the motor mount 20 has an annular wall 20a directed toward the main body 1 side and is formed in a bottomed cylindrical shape with the main body 1 side opened, and the bottom wall 20b is fitted in the center portion. The hole 21 is formed. Also, this fitting hole 2
1. A protrusion 1 provided on the outer blade mounting base 13 located on the outer periphery of
Three sliding concave portions 22 formed corresponding to 3h are provided in an equal number of three, and the sliding concave portions 22 are formed by the projections 13 described above.
The projection 1 with the center of curvature of the convex spherical surface 13g of h as the center
It is formed as a concave spherical surface having a radius of curvature larger than the radius of curvature of the convex spherical surface 13g of 3h, and the through hole 23 is formed at the bottom thereof.
Is provided. With the above configuration, as will be described later, the motor mount 20 and the outer blade mount 13 are screw 3
When integrally attached by 6, the protrusion 13
A spherical gap G is formed between the convex spherical surface 13g of h and the concave spherical surface of the sliding concave portion 22. Further, three spring receiving recesses 24 are provided on the opposite side of the motor mounting base 20 from the side where the sliding recesses 22 are formed so as to be located between the sliding recesses 22. ing.

The motor 30 mounted on the motor mount 20 is provided with a fitting protrusion 31 that fits into the fitting hole 21, and the fitting protrusion 31 is fitted into the fitting hole 21. Motor mount 2 with screws 36
It is designed to be attached to 0. An output shaft 32 is provided so as to project from the center of the fitting convex portion 31, and a drive shaft 33 is attached to the output shaft 32, and the tip end of the drive shaft 33 is the inner blade. It is detachably fitted in the fitting hole 15a of the base 15 and is formed in a D-shaped cross section so that the inner blade mounting base 15 can be rotated.

The annular wall 2 of the motor mount 20
0a has a function of a cover that covers the inside of the support base 40 from the opening when the blade block 10 described later rotates, and its outer peripheral surface supports when the blade block 10 rotates. It is formed in a spherical shape so as not to interfere with the opening of the table 40.

Next, the support base 40 is formed in the shape of a bottomed cylinder having one side, that is, the blade block 10 side opened, and a through hole 42 is formed in the center of a bottom wall 41 thereof. When the blade block 10 rotates, the through hole 42
The motor 30 arranged so as to penetrate through the through hole 4
The size is set so as not to interfere with the lip of No. 2. The support base 40 has its fitting portion 40a fitted into the mounting opening 2c formed in the front case 2a, and is mounted by a coupling means (not shown). The support base 40 may be formed integrally with the front case 2a. Further, three bosses 43, which are formed around the through hole 42 and are arranged concentrically with the through hole 42 and provided with guide holes 43a, are arranged on the bottom wall 41 in three equal parts. In addition, three spring support protrusions 44 are provided between these bosses 43 in such a manner that three spring support protrusions 44 are equally arranged. One end side of the spring support protrusions 44 is fitted to the motor mount 20 and the other end side thereof is attached to the motor mount 20. A spring 59 is arranged so as to be positioned in the provided spring receiving recess 24, and this spring 59 supports the blade block 10 on the support base 4.
Direction of separating from the bottom wall 41 of 0 (upward in FIG. 2)
It is urged to and kept in a floating state.

The upper end of the boss 43 is an incline which gradually increases toward the inside, that is, toward the side of the through hole 42, and the highest apex is an abutting part 43b which abuts the lower side of the motor mount 20. Has become. When the contact portion 43b contacts the lower surface of the motor mount 20, the blade block 10 is regulated from rotating and is fixedly supported by the support base 40. Incidentally, the reason why the rotation of the blade block 10 is restricted is that
This is because, for example, when shaving a beard under the nose, it is effective to regulate the rotation of the blade block 10 and keep the blade block 10 in a fixed state for effective shaving. If you want to use this blade block 10
When it is pushed down toward the bottom wall 41 side of 0, it is held in a state of being pushed down by the engaging means (not shown), and in this holding state, the abutting portion 43b abuts the motor mount 20 and the blade block 10 is in a fixed state. Become. Further, the fixed state is released by releasing the engagement of the engaging means.

Then, the boss 43 provided on the support base 40.
The holding member 50 is movably provided in the guide hole 43a. The holding member 50 has a shaft portion 51 that is movably inserted into the guide hole 43a, and an upper end portion of the shaft portion 51 in FIG. A spherical portion 53a is formed so as to rotatably slidably contact the spherical surface, and a concave shape is rotatably slidably contacted with a convex spherical surface 13g formed at the tip of the projection 13h provided on the outer blade mounting base 13 at the upper portion. Each spherical surface portion 53b is formed. Further, a screw hole 54 is provided on the lower side of the shaft portion 51, and a stopper 55 is provided at the lower end portion of the rear shaft portion 51, which penetrates the holding member 50 through the guide hole 43a, and a screw 54a at the screw hole 54. Install by. As a result, the holding member 50 is movably attached while being retained in the guide hole 43a.

The motor 30 has a connection terminal 37.
a, 37b are provided, and the connection terminals 37a, 3b
One ends of lead wires 38a and 38b are connected to 7b, and the other end sides of the lead wires 38a and 38b are connected to a circuit board (not shown).

Next, the assembling of the electric shaver having the above construction will be described.

First, a battery, a circuit board, etc. (not shown) are arranged at predetermined positions of the front case 2a and the rear case 2b, and the main body 2 assembled by connecting the front case 2a and the rear case 2b with screws (not shown) is assembled. prepare.

Next, the assembly of the blade block 10 will be described. When the blade block 10 is assembled, the holding member 5
0 can also be assembled at the same time. First, the shaft portion 51 is inserted into the through holes 23 of the three sliding concave portions 22 provided on the motor mount 20, and the spherical portions 53 of the three holding members 50 are inserted.
a is positioned in the sliding concave portion 22 and attached to the sliding concave portion 22, the fitting convex portion 31 of the motor 30 is fitted in the fitting hole 21 and positioned, and the drive shaft 33 is attached to the output shaft 32. Fit and install. The drive shaft 33 may be attached later. Next, in this state, the outer blade mounting base 13 is positioned such that the convex spherical surface 13g at the tip of the projection 13h is positioned inside the concave spherical surface portion 53b of the holding member 50, and the screw 36 is provided on the outer blade mounting base 13 in this state. The screw hole 13a is inserted into the screw hole 13m and screwed into the screw hole 30a provided at the upper end of the motor 30. This screw 36 is screwed into the screw hole 31a of the motor 31.
In the state in which the blade block 10 is screwed into the
Is assembled.

The drive shaft 33 is fitted to the output shaft 32 of the motor 30, and the tip of the drive shaft 33 projects through the through hole 13e of the outer blade mount 13. The blade block 10 is assembled as described above. At the time of this assembly, the holding member 50 is incorporated in the blade block 10 in a rotatable state.

The holding member 50 is the blade block 1.
In the state of being incorporated in 0, the spherical portion 53a provided on the upper end portion of the shaft portion 51 becomes the concave spherical surface of the sliding concave portion 22,
Further, the concave spherical surface portion 53b formed on the upper surface is rotatable while slidingly contacting the convex spherical surface 13g formed on the tip portion of the projection 13h of the outer blade mounting base 13. On the contrary, as described later, when the holding member 50 is inserted into the guide hole 43a of the boss 43 of the support base 40, the sliding concave portion 22 with respect to the spherical surface portion 53a and the concave spherical surface portion 53b is, as will be described later. The concave spherical surface and the convex spherical surface 13g formed at the tip of the projection 13h are rotated, and the outer blade mounting base 13, the motor mounting base 20, and the motor mounted on the motor mounting base 20 are integrated. The blade block 10 composed of 30 or the like is in a state in which it can be rotated, that is, tilted with respect to the holding member 50.

Next, the spring 59 is fitted into the spring support protrusion 44 formed on the support base 40, and then the shaft portion 51 of the holding member 50 incorporated in the blade block 10 is inserted into the guide hole 43a of the boss 43. After that, the blade block 10 is attached to the support base 40 by attaching the stopper 55 to the shaft portion 51 with the screw 54a.

In this way, the support base 40 to which the blade block 10 is mounted is fitted to the mounting opening 2c of the front case 2a at its fitting portion 40a, and is attached to the front case 2a, that is, the main body 2 by a coupling means (not shown). By attaching the blade block 10, the blade block 10 is attached to the main body 1 together with the support base 40.
Although not shown, the coupling means is, for example, a support base 40.
It may be configured such that a coupling protrusion is provided on the front side and a coupling recess that is coupled to the coupling protrusion is provided in the mounting opening 2c of the front case 2a.

After fitting the inner cutter base 15 to the drive shaft 33, the outer cutter frame 12 is attached to the outer cutter mount to assemble the electric razor 1.

In the assembled state as the electric razor, the blade block 10 is attached to the support base 40 via the holding member 50,
In this state, the blade block 10 is biased by the spring 59 in the direction away from the support base 40, that is, in the direction away from the main body 1, and is held in a floating state by the spring 59 and the holding member 50. Since it is held in the floating state in this way, when a pressing force larger than the biasing force of the spring 59 is applied to the outer blade 11 in the axial direction of the drive shaft 33 during the shaving operation, the holding member is held. The shaft portion 51 of 50 moves to the main body 2 side in the guide hole 43a, and accordingly, the blade block 10 also moves in the axial direction of the drive shaft 33, and when the pressing force is removed, the original Return to the state.

During the shaving operation, when a pressing force larger than the urging force of the spring 59 is applied to the outer peripheral portion of the outer cutter 11 at a position partially offset from the center, the side to which the pressing force is applied is applied. The spring 59 is compressed and contracts, but the pressing force is not applied to the spring 59 on the opposite side, that is, the opposite position, and even if it is applied, it is not large enough to compress the spring 59. Then, at this time, the sliding concave portion 22 provided on the motor mounting base 20 of the blade block 10 and the tip end portion 13g of the protrusion 13h are provided with the spherical portion 53a and the concave spherical portion 53b provided on the upper end portion of the shaft portion 51. The blade block 10 pivots or tilts with respect to the support base 40, and when the offset pressing force is removed, the blade block 10 is biased by the compressed spring 59.
Returns to its original state.

It should be noted that three holding members 50 are provided at positions equidistantly arranged in the circumferential direction, and the blade block 10 and the holding member 50 are the sliding recesses 2 of the motor mount 20.
2, because the spherical portion 53a and the concave spherical portion 53b provided on the tip portion 13g of the protrusion 13h of the outer blade mounting base 13 and the upper end portion of the shaft portion 51 of the holding member 50 are formed spherical, The blade block 10 can be tilted in any direction with respect to the support base 40, and therefore the outer blade 1
Regardless of which displacement position on the outer peripheral portion of 1, the pressing force can be tilted in the direction in which the pressing force is applied, and the shaving surface, that is, the pressing force applied from the skin during the shaving operation is applied to the skin. It can follow.

The annular shaving surface 11 of the outer cutter 11
The blade body 14b of the inner blade 14 slidingly contacting the inner surface of b is formed so that the arcuate surface of the inner surface of the annular shaving surface 11b is roughly bisected and slidably contacting each inner surface.
Are independently slidably in contact with the inner surface of the annular shaving surface 11b. Therefore, for example, even when the outer shaving surface 11b is deformed on either one of the outer side and the inner side of the outer shaving surface 11b when the outer blade 11 is manufactured, when the shaving is applied with a pressing force of a predetermined amount or more from the skin. Even if a part is temporarily or permanently deformed, the blade bodies 14b that are in sliding contact with the outer portion and the inner portion are in slidable contact independently of each other. Even if the adhesion between the inner surface of the deformed portion and the blade body 14b is impaired, the adhesion between the inner periphery that is not deformed and the blade body 14b is ensured, so that the blade body 14b as the entire shaving surface is formed. And ring shaving surface 11
The adhesion of the inner surface of b is not impaired. Further, in the case where a part of the inner surface of the annular shaving surface 11ba is temporarily or permanently deformed due to the above-mentioned circumstances, conventionally, one blade body slidably contacts the entire arc of the inner peripheral surface. Because of the configuration, the pressing force resulting from this deformation increases the frictional force generated on this blade and the inner surface of the annular shaving surface that is in sliding contact with this blade, and as a result, the load on the motor increases and the rotation speed decreases. Although good shaving is not performed, since the inner blade 14 that is in sliding contact with the inner surface of the annular shaving surface 11b is composed of a plurality of inner blades 14 along the arc surface as described above, the partial deformation is Although the frictional force due to the blade body 14b slidingly contacting a certain inner surface increases, the frictional force of the blade bodies 14b other than this blade body 14b does not increase, and therefore the increase of the load of the motor 30 can be prevented as a whole. Those capable of maintaining good shaving without lowering the rotational speed of 14.

Further, even if a part of the inner surface of the annular shaving surface 11b is deformed, the frictional force due to the blade bodies 14b other than the blade body 14b slidably contacting the deformed inner surface does not increase. The blade 14b or the inner surface of the annular shaving surface 11b can be prevented from being worn and can be used for a long period of time.

Next, the operation of the electric shaver having the above structure will be described.

First, when shaving with the outer blade 11 following the skin, the engaging means (not shown) is released to bring the blade block 10 into a floating state, and then a drive switch (not shown) is operated. The motor 30 is driven to operate for shaving. Then, during the shaving operation, the outer blade 11 is moved while being shaved on the skin. At this time, the outer blade 11 receives a pressing force from the skin, and the blade block 10 is moved in accordance with the pressing force.
The outer blade 11 follows the skin due to the rotation of the blade, and good shaving is achieved. Furthermore, if a certain amount of pressing force is applied from the skin to the ring-shaped shaving surface 11b during the shaving operation and a part of the ring-shaped shaving surface 11b is deformed, the inner circumference of the ring-shaped shaving surface 11b in which the deformation is generated is generated. The inner blade 14 slidingly contacting the surface moves inward against the urging force of the spring S, and the blade body 14b is separated from the inner peripheral surface and its adhesion is impaired. Blade 14b
Is brought into sliding contact with the inner peripheral surface of the annular shaving surface 11b while maintaining close contact, and the overall shaving performance is maintained and good shaving is performed.

Even if the deformation occurs, as described above, the frictional force between the other blade 14b and the inner peripheral surface of the annular shaving surface 11b does not increase and the load of the motor 30 increases. Therefore, it is possible to prevent a decrease in the number of rotations and to perform good shaving.

When it is desired to use the blade block 10 in a fixed state, the blade block 10 is pushed down to the support base 40 side and the blade block 10 is fixed to the support base 40 by the engaging means (not shown). Should be done.

In the above embodiment, the base 14a of the inner blade 14 is inserted through the inner blade mounting holes 15c and 15d formed in the inner blade mounting base 15 in the direction parallel to the axial direction of the drive shaft 33. The arrangement is such that, as shown in FIG. 5, this is the apex T of the circular arc of the inner peripheral surface of the annular shaving surface 11b and this apex T.
Inner blade installation holes 215c and 215d are formed by inclining with respect to the axial direction of the drive shaft 33 in a direction with the normal line H passing through the midpoint P of the arc on the outer side portion as the axis center. The base portion 214a of the inner blade 214 may be inserted into the mounting holes 215c and 215d so that the center point of the blade body 214b is substantially aligned with the center point P of the annular shaving surface 11b. In this case, the biasing direction of a spring (not shown) that biases the inner blade 214 is provided so as to coincide with the direction of the normal line H so that the inner blade 214 moves smoothly.

Further, as shown in FIG. 6, the annular shaving surface 11
The inner blade mounting hole 215 has an apex T of an arc on the inner surface of b and a normal line H passing through a midpoint P of the arc outside the apex T as an axis.
c, 215d are formed, and the inner blade mounting holes 215c, 21
5d is provided with the inner blade 214 inserted through the base portion 214a thereof, and the opposite end portions of the inner blade 214 slidingly contacting the inner surface of the annular shaving surface 11b are provided with the apex T of the arc surface.
It is also possible to form the blade body 214b in a shape exceeding the above, and to construct the apexes such that the opposing ends of the blade bodies 214b overlap each other over a region having a width W, as shown in FIG. By providing the overlapping region in this manner, the chance of shearing the beard in the region can be doubled. Then, the annular shaving surface 1
The apex portion of 1b is the most used portion for shaving, and the shaving efficiency can be improved by providing the overlapping area at the apex portion.

Further, in the above embodiment, two inner blades along the circular arc surface of the inner peripheral surface of the annular shaving surface are divided into two substantially equal parts, and the blade bodies of the two inner blades are brought into sliding contact with each other. However, the number is not limited to two and may be two or more.

[0045]

According to the first aspect of the present invention configured as described above, a plurality of outer blades are arranged along the arc of the inner surface of the annular shaving surface even if the outer blade is deformed by the pressing force received from the shaving surface. Good shaving can be done because any of the inner blades maintains good adhesion to the inner peripheral surface of the outer blade, and the frictional force between the inner blade and the inner peripheral surface of the shaving surface due to the deformation. It is possible to prevent an increase in the number of rotations of the motor, prevent a decrease in shaving performance, and prevent wear of the blade body of the inner blade or the outer blade. In addition to the effect of claim 1, the invention of claim 2 is introduced from the whiskers introduction hole of the outer blade because the inner blades overlap each other in the shaving direction in the circumferential direction of the annular shaving surface. This has the effect that the beard can be sheared reliably and efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire electric shaver according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of the above embodiment.

FIG. 3 is an exploded perspective view of the blade block according to the above embodiment.

FIG. 4 is a cross-sectional view showing the relationship between the outer blade and the inner blade of the above embodiment.

FIG. 5 is a cross-sectional view showing another example of the outer blade and the inner blade of the above embodiment.

FIG. 6 is a cross-sectional view showing still another example of the outer blade and the inner blade of the above embodiment.

FIG. 7 is a cross-sectional view showing a relationship between an outer blade and an inner blade of a conventional electric shaver.

[Explanation of symbols]

 1 Electric Razor 2 Main Body 10 Blade Block 11 Outer Blade 11b Ring Shaving Surface 13 Outer Blade Mounting Base 13a Inner Blade Storage 14 Inner Blade 14b Blade 15 Inner Blade Mounting Base 30 Motor S Spring (Elastic Member)

Claims (2)

[Claims] 1. A main body having a motor inside and an inner blade arrangement portion provided, and an outer blade having an annular shaving surface formed in an arc-shaped cross section and attached to cover the inner blade arrangement portion. An inner blade mounting base disposed in the inner blade mounting portion and driven to rotate by the motor; and an inner blade mounted on the inner blade mounting base and pressed against the inner surface of the annular shaving surface by an elastic member. In the electric razor for shaving by rotating the inner blade mounting base by the motor and sliding the inner blade on the annular shaving surface, the inner blade disposed on the inner blade mounting base is rotated. An electric razor comprising a plurality of inner blades arranged along the inner arc of the annular shaving surface having an arcuate cross section. 2. A plurality of inner blades, which are arranged along an inner surface arc of an annular shaving surface having an arcuate cross section of the outer blade, are partially overlapped with each other on opposite sides of the inner shaving surface along a circumferential direction of the annular shaving surface. The electric shaver according to claim 1, wherein the electric shaver is arranged.