JPH067555A - Electric razor and manufacture of outer blade therefor - Google Patents

Abstract

PURPOSE:To contrive smooth introduction of beard by arranging a slit of an outer blade to cross a virtual line toward the center at a specified angle in the electric razor which has the outer blade with a radial slit opened to introduce the beard to a ring-shaped shaving face. CONSTITUTION:An electric razor 10 has three cup-shaped outer blades 12 in a triangular array on a shaving face 11 at an upper part of a casing and an inner blade 40 slides inside the outer blades to cut beard. In this case, the shaving faces 20 of the outer blades 12 are divided into three shaving faces 21-23 concentrically and radial slits are formed on the respective shaving faces 21-23 traversing the shaving faces 20. The slits are made up of the first slit 24a crossing the shaving faces 20 as a whole, the second slit 24b opened on the shaving faces 22 and 23 and a zone groove 26 and the third slid 24c opened between the slits 24a and 24b opened on the shaving face 23. The individual slits 24a-24c are so formed as to cross an virtual line L toward the center at a specified angle alpha.

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 a method for manufacturing an outer blade for an electric shaver.

[0002]

2. Description of the Related Art As an outer blade of an electric shaver, one having two concentric shaving surfaces is known. For example, there is Japanese Patent Publication No. 41-14339. The outer blade is provided with a shaving surface on which a partition groove for partitioning the concentric inner shaving surface and the outer shaving surface is provided. This partition groove has a right angle. Further, a plurality of radial slits are individually opened on each shaving surface.

[0003]

In the above-mentioned outer blade, since the partition groove for partitioning the shaving surface is simply recessed, hair scraps and fat secreted from the skin tend to accumulate in this partition groove, which is not hygienic. . Moreover, the processing is troublesome. It is also conceivable that the whiskers located in the partition groove hit the bottom surface of the partition groove and are bent. On the other hand, although the outer blade can be manufactured by a press machine, it is difficult to open the slit with high accuracy. Therefore, it is an object of the present invention to provide a method for manufacturing an electric shaver and an electric razor outer blade capable of smoothly introducing a beard.

[0004]

In order to solve the above problems, the present invention has the following constitution. An electric razor has an outer blade that opens a radial slit that introduces a beard into a ring-shaped shaving surface, and an inner blade that slides inside the shaving surface of the outer blade to cut the beard that is introduced from the slit. In the razor, the ring-shaped shaving surface is divided into a plurality of sections by one or a plurality of dividing grooves that are concentric with the center point of the shaving surface, and the innermost shaving surface is divided from the outermost shaving surface of the plurality of shaving surfaces. Up to this, the slits including the partitioning grooves are provided at appropriate intervals, and one or a plurality of slits are provided between the slits that open to the innermost partitioning groove or the partitioning grooves outside thereof.

The ring-shaped shaving surface is divided into a plurality of sections by one or a plurality of dividing grooves that are concentric with the center point of the shaving surface, and the radial slits intersect a virtual line toward the center at a predetermined angle. It is characterized by doing so. The partition groove may be formed so that the bottom surface becomes narrow.
Further, the opening width of the slit may be wider on the front surface side than on the rear surface side. In addition, the inner blade that slides on the inside of the shaving surface of the outer blade is formed to have a size that straddles at least one partition groove, and the portion of the inner blade that corresponds to the partition groove of the outer blade is
It may be formed in a concave blade that slides following the inner shape of the partition groove.

As a method of manufacturing the outer blade, a ring-shaped shaving surface formed on the outer blade for an electric razor is divided into a plurality of sections by one or a plurality of dividing grooves that are concentric with the center point of the shaving surface. In order to open the slit so as to cross the shaving surface and the dividing groove and intersect the virtual line toward the center at a predetermined angle, open the slit by abutting a rotary cutter on the shaving surface and the dividing groove. In order to provide one or a plurality of other slits that open to the innermost partition groove or the outermost partition groove between the slits, a rotary cutter or the like is brought into contact with the shaving surface that opens the other slits, and the other slits are provided. Is characterized in that the opening is made.

[0007]

[Operation] The operation will be described. Since the slits are provided at appropriate intervals from the outermost shaving surface to the innermost shaving surface of the shaving surface divided into a plurality of areas, the skin is partially extended by the partitioning groove, so that the beard can be smoothly introduced. You can Further, by forming the slit side to be wide, the whiskers can be introduced more smoothly.

Further, in order to manufacture an outer blade for an electric razor, a plurality of ring-shaped shaving surfaces formed on the outer blade for an electric razor are formed by one or a plurality of partition grooves concentric with the center point of the shaving surface. In order to open the slit so that it intersects each shaving surface and the dividing groove and intersects the virtual line toward the center at a predetermined angle, a rotary cutter, etc. is brought into contact with the shaving surface and the dividing groove that open the slit. A slit is opened, and one or more other slits that open to the innermost partition groove or the outer partition groove are provided between the slits so that a rotary cutter or the like is provided on the shaving surface on which the other slits are opened. Abut and open another slit.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a partial plan view of an outer blade of an electric shaver according to the present invention. FIG. 2 is a cross-sectional explanatory view showing a state in which the outer blade and the inner blade are combined. FIG. 4 is a front view of the electric shaver according to the present invention. As shown in FIG. 4, the shaving surface 11 of the casing upper portion of the electric razor 10 is shown.
The outer blades 12 are arranged in an inverted triangular shape. As shown in FIG. 2, the outer blade 12 is entirely formed in a cup shape. A center cover 18 for inserting and guiding the tip of the drive transmission block 16 fixed to the center of the inner blade 40 is fixed to the center of the outer blade 12. In addition, a flange portion 13 is formed on the circumferential portion on the opening side (lower side) of the outer blade 12, and this flange portion 13 is used when the outer blade 12 is fitted into the through hole 11a from the inside of the shaving side surface 11. It is a retainer.

The annular surface of the outer cutter 12 other than the one covered by the center cover 18 is a shaving surface 2 for pressing against the skin.
It is 0. The shaving surface 20 is concentrically divided into three shaving surfaces. The shaving surface 20 is referred to as a shaving surface 21, a shaving surface 22, and a shaving surface 23 from the center side. Each shaving surface 21,
22 and 23 are partitioned by concentric partition grooves 25 and 26. The partition grooves 25 and 26 are shallow U-shaped recesses. On the other hand, the partition grooves 25 and 26 project inward, and the grooves are formed corresponding to the back surfaces of the shaving surfaces 21, 22, and 23 of the outer blade 12. This groove is 40
Blade grooves 31, 32, 33 for fitting and passing the blade body of
Is.

Radial slits that cross the shaving surface 20 are opened in the shaving surfaces 21, 22, and 23. The slit will be described with reference to FIG. There are the following three types of slits. First, the first slit is
Slits 24a that are linearly arranged and open so as to traverse each shaving surface 21, 22, 23 and partition grooves 25, 26
And The second slit is located between the slit 24a and the slit 24a, and is a slit 24b which is open to the shaving surfaces 22 and 23 and the partition groove 26. Further, the third slit is the slit 2 which is opened in the shaving surface 23.
Slit 24c opened between 4a and slit 24b
Is.

Similarly, the slits 24a ..., The slits 24b ...
Slits 24c ... Are formed. If the number of slits on the shaving surface 21 is 1, the ratio of the number of each slit is
The shaving surface 22 is 2, and the shaving surface 23 is 4. Each shaving surface 2
Comparing Nos. 1, 22, and 23, the area of the shaving surface 21 on the center side is small, and the area is large toward the outside. Therefore, it is possible to form many slits on the shaving surface located outside.

Each of the slits 24a, ..., Slit 2
The slits 4b ..., The slits 24c ... Are opened so as to intersect with a virtual line toward the center at a predetermined angle α. For example, as shown in FIG. 5, the slit 24c intersects the virtual line L directed toward the center at an angle α. Similarly, the slits 24b and 24c also intersect the corresponding virtual line L at an angle α.

Next, the inner blade 40 will be described with reference to FIGS. 2 and 3. Blade grooves 31, 3 of the outer blade 12
Since the inner blade 40 is fitted into the blades 2 and 33, the inner blade 40 is provided with a plurality of three types of blade bodies 42a, 42b and 42c having different distances from the center. Disc part 44 that constitutes the inner blade 40
The drive transmission block 16 is fixed to the center of the. The drive transmission block 16 is composed of a guide portion 16A that projects upward from the disc portion 44 and a drive transmission portion 16B that projects downward. The guide portion 16A is inserted and guided in the inner recess 18a of the center cover 18. Further, the drive transmission portion 16B is formed in a trumpet shape so that the tip of the drive shaft 15 that transmits the power from the drive source fits, and the introduction portion 16c. 15 is a flattened tip portion 15a.
Is formed with the fitting portion 16d.

Arms for attaching the blades 42a, 42b, 42c extend at equal intervals on the outer peripheral edge of the disc portion 44. The blade body 42a fits into the blade groove 31 on the center side, is located on the most center side, and is fixed upright from the short arm 46a. The blade body 42b fits in the intermediate blade groove 32, and is provided upright at the tip of the arm 46b. The blade body 42c fits into the outer blade groove 33, and is provided upright at the tip of the arm 46c.

The shape of the blade body of another inner blade will be described with reference to FIG. A blade body 48 having a width that slides along the inner surface of the shaving surface 20 of the outer blade 12 is provided at the tip of an arm 49 extending from the disc portion 44 forming the inner blade 40. The blade body 48 has a blade 48a having a shape that slides along the inner surfaces of the blade grooves 31, 32, 33 and the partition grooves 25, 26.
have. In particular, the part corresponding to the inside of the partition grooves 25, 26 is formed as a concave blade that slides following the inner shape of the partition grooves 25, 26.

In this embodiment, the blade 48 has the entire width of the inner side surface of the shaving surface 20, but it has a size that straddles at least one partition groove 25, 26, that is, the blade groove 31 of the outer blade 12.
The width may be the width of the blade groove 32 or the blade groove 32 and the blade groove 33. In this case, each blade may be supported by an arm standing upright from the disc 44. In this example, compartment grooves 25, 26 into which long whiskers can be introduced.
But you can cut the beard. In this way the partition groove 2
The whiskers cut at 5, 26 will be cut shorter at the shaving surface 20.

As described above, each slit 24 intersects the imaginary line L at an angle α, and the whiskers penetrating from each slit 24 are not parallel to the blade bodies 42a, 42b, 42c, 48. Therefore, there is a beard cutting angle, and the beard can be easily cut.

Here, a method of manufacturing the outer blade will be described with reference to FIG. The shaving surface 20 of the outer blade 12 is divided into concentric shaving surfaces 21, 22, and 23. The slit is not open. To open a slit in the shaving surface 20 of the outer blade 12, use a rotating rotary cutter 56,
The outer blade 12 is brought closer to the shaving surface 20. First, each shaving surface 2
The slits 24a that linearly cross the 1, 22 and 23 and the dividing grooves 25 and 26 are opened. This moves the center of the rotary cutter 56 to the O position to form the slit 24a, as shown in FIG. At this time, the position of the tip edge of the rotary cutter 56 is A. The rotary cutter 56 is applied to the shaving surfaces 21, 22, 23 and the dividing grooves 25, 26 so as to intersect the virtual line L at an angle α.

Further, slits 24b are formed on the shaving surfaces 22 and 23.
Is opened by moving the center of the rotary cutter 56 to the P position. At this time, the slit 24b is also opened in the partition groove 26. The position of the leading edge of the rotary cutter 56 is B. Further, the shaving surface 23 has a slit 24c.
Is opened by moving the center of the rotary cutter 56 to the Q position. The position of the tip edge of the rotary cutter 56 at this time is C. Similarly, the slits 24a, 24
b and 24c are formed on the entire shaving surface 20.

It is preferable to chamfer the corners of the peripheral edge of the rotary cutter 56. In this way the rotary cutter 5
Since 6 has chamfered portions 56a, 56a, the slit 2
4a can be formed so that the shaving surface 20 side (front surface side) is wide and the back surface side is narrow (see FIG. 8). Other slits 24b ..., 24c ... Can be similarly formed. By forming the shape of the slit in this way, the introduction of the whiskers becomes easy. A rotary grindstone may be used for the slit opening instead of the rotary cutter 56.

In the above embodiment, in the outer cutter 12, the slits 24a and 24b are opened across the partitioning grooves 25 and 26, but the partitioning grooves 25 and 26 interrupt the slits 24a and 24b. It may be done. That is, as shown in FIG. 9, in the slit 24a, notches 25a and 26a are formed also in the partition groove 25 and the partition groove 26, while part of the partition groove 25 and the partition groove 26 remains as connecting portions 25b and 25b. ing. The strength of the shaving surface 20 can be ensured by the existence of the connecting portions 25b and 26b. Also,
The whiskers located in the cuts 25a and 26a are
Guided by a and 26a, it moves to each shaving surface 21-23 position, and is cut.

Although the shaving surface 20 is formed in a triple concentric shape in the above embodiment, it may be a double concentric shape, a quadruple concentric shape, or a quintuple concentric shape. In addition, partition grooves 25, 26
May be V-shaped instead of U-shaped. Although various explanations have been given with reference to the preferred embodiments of the present invention, the present invention is not limited to the above embodiments, and the blade body of the inner blade may be fit into the blade groove of the outer blade. Of course, many modifications can be made without departing from the spirit of the invention.

[0024]

As described above, the electric shaver according to the present invention is provided with slits in the concentric shaving surface and the dividing groove of the surface of the outer blade for the electric shaver. The secreted fat is hard to collect and is hygienic, and the partition groove is U-shaped or V-shaped to make it more difficult to collect. Further, the slit is provided in the partition groove and the blade is provided so that the beard introduced from the slit of the partition groove can be cut, so that a large shaving surface of the beard can be secured.

Furthermore, the skin is pulled by the shaving surfaces of the inner and outer circumferences sandwiching the dividing groove, which enables deep shaving. In addition, a whisker of a length that cannot be introduced by simply contacting the shaving surface with the skin in the past can be introduced into the slit of the partition groove and cut shortly, and then the beard can be cut with the shaving surface that adheres to the skin. it can. Further, the beard can be introduced more smoothly by forming the partition groove into a U shape or a V shape. Further, the strength of the outer blade can be further increased by preventing the slit crossing the partition groove from cutting the partition groove. On the other hand, since the outer blade of the electric razor is opened by a rotary cutter or the like, it is possible to achieve remarkable effects such as highly accurate formation.

[Brief description of drawings]

FIG. 1 is a partial plan view of an outer blade of an electric shaver according to the present invention.

FIG. 2 is a cross-sectional explanatory view showing a fitted state of an inner blade and an outer blade and a cross-sectional state of an outer blade.

FIG. 3 is a plan view of an inner blade.

FIG. 4 is a front view of the electric razor according to the present invention.

FIG. 5 is a partial plan view showing the slit direction of the outer blade of the electric shaver according to the present invention.

FIG. 6 is a cross-sectional explanatory view showing the relationship between the blade body of another inner blade and the outer blade.

FIG. 7 is an explanatory diagram showing a moving state of the rotary cutter when opening a slit in the shaving surface of the outer blade.

FIG. 8 is an explanatory view showing width shapes of a rotary cutter and a slit.

FIG. 9 is an explanatory diagram showing a shape of a slit of an outer blade.

[Explanation of symbols]

 10 Electric Razor 12 Outer Blade 16 Drive Transmission Block 18 Center Cover 20, 21, 22, 23 Shaving Surface 24a, 24b, 24c Slit 40 Inner Blade 56 Rotating Cutter

Claims (6)

[Claims] 1. A ring-shaped shaving surface having an outer blade that opens a radial slit for introducing a whisker, and an inner blade that slides inside the shaving surface of the outer blade to cut a whisker introduced from the slit. In the electric razor, the ring-shaped shaving surface is divided into a plurality of sections by one or a plurality of dividing grooves that are concentric with the center point of the shaving surface, and the innermost shaving surface is divided from the outermost shaving surface of the plurality of shaving surfaces. An electric shaver, characterized in that slits that open to the surface including partition grooves are provided at appropriate intervals, and one or more slits that open to the innermost partition groove or the partition grooves outside thereof are provided between the slits. 2. An outer blade having a radial slit for introducing a whisker on a ring-shaped shaving surface and an inner blade for sliding the inside of the shaving surface of the outer blade to cut a whisker introduced from the slit. In the electric razor, the ring-shaped shaving surface is partitioned into a plurality of sections by one or a plurality of partition grooves that are concentric with the center point of the shaving surface, and each of the radial slits forms a predetermined angle with a virtual line toward the center. An electric razor characterized by being crossed. 3. The electric shaver according to claim 1, wherein the partition groove is formed so that the bottom surface becomes narrow. 4. The electric shaver according to claim 1, wherein the opening width of the slit is wider on the front surface side than on the rear surface side. 5. The inner blade that slides inside the shaving surface of the outer blade is formed to have a size that straddles at least one partition groove, and the portion of the inner blade that corresponds to the partition groove of the outer blade is the partition groove. The electric shaver according to claim 1, wherein the electric shaver is formed as a concave blade that slides following the inner shape. 6. A ring-shaped shaving surface formed on an outer blade for an electric razor is divided into a plurality of sections by one or a plurality of dividing grooves concentric with the center point of the shaving surface, and each shaving surface and the dividing groove are formed. In order to open the slit so as to intersect with the virtual line toward the center at a predetermined angle while crossing, a rotary cutter is brought into contact with the shaving surface and the dividing groove for opening the slit to open the slit, and between the slits. In order to provide one or a plurality of other slits that open to the innermost partition groove or the outer partition groove,
A method for manufacturing an outer blade for an electric razor, wherein a rotary cutter or the like is brought into contact with a shaving surface which opens the other slit to open the other slit.