JPS6026777Y2 - electric razor outer blade - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of the outer blade of an electric shaver, which prevents local deformation of the outer blade and provides an outer blade pattern with excellent sharpness and good contact with the skin.

Conventionally, this type of outer cutter pattern was designed by dividing the entire surface of the outer cutter into multiple spiral ribs that spread from the center to the outer periphery, in order to prevent uneven wear with the inner cutter and improve the aperture rate of the hair introduction hole. A type with long holes arranged along the edge has been proposed, but with this type, the pushing force during use deforms the outer blade in a spiral shape, so the strain between it and the peripheral fixing part that does not deform is caused by the muscular bone. This occurred several times, not only worsening the sliding contact with the inner surface but also causing damage.

This invention eliminates these drawbacks by equally dividing the entire outer cutter surface into a plurality of substantially triangular block surfaces, and the dividing ribs between each block surface are wavy and curved, and each block surface is The outer cutter is constructed by arranging a large number of hair introduction holes so that the long axis direction of the holes runs along the wavy curved ribs.

An embodiment of this invention will be described below with reference to the drawings.

FIG. 1 shows a donut-shaped outer cutter in which a central portion 1 is recessed and an annular cross-sectional arch portion 2 is formed around the outer cutter, with a partially omitted plan view on the left and a central sectional view on the right.

The blade surface is divided into six equal parts in the radial direction by a wavy curved base line rib A having an S-shape with a loose blade surface, and the same pattern is arranged in each equally divided section B.

The reason why the entire blade surface is divided into six equal parts by repeating the same pattern is to ensure that almost the same bristling effect can be obtained no matter where the bristles are pricked.

Each section B has one long hole group 3 on the outermost periphery and two long hole groups 4 in the center, and is sandwiched between these long hole groups 3.4 and shaped into a trapezoidal shape. A short piece LIJ5 consisting of a rectangular small hole is inclined and is arranged slightly outwardly from the apex 2a of the cross-sectional arch part 2, and one tip 5a
extends almost to the outermost circumference of the blade surface.

Therefore, concentric circles C and D passing through each corner of the trapezoidal short hole group 5
, E, and F, the concentric circles C and D are X and the concentric circle E is
, F-Y is a zone where long hole 6 and short hole 7 coexist,
This area not only shears long hair, but also provides a finishing shave.

A concentric circle including the top part 2a of the annular cross-sectional arch part 2,
The reason why the short hole group 5 occupies a wide area between E and Z is because the donut-shaped outer cutter shape is said to have relatively weak mechanical strength.
This is to prevent deformation of this part due to pressure on the skin as much as possible.

Also, number hole 3. 4. 5. 6. 7 long axes a, b,
C, d are arranged along the undulating curved baseline rib A, so that the holes 3, 4° 5, 6, 7 are arranged radially extending on each block face.

In particular, the long axis a of the holes 3, 4, 5, 6, and 7.

By arranging b, C, and d along the wavy curved base line rib A, the number holes 3,
The arrangement of 4, 5, 6, and 7 always faces in the opposite direction once, and the scissor angle with the inner cutter (not shown) changes in the increasing and decreasing directions, making it possible to smoothly introduce long hairs with disordered directionality. This allows the long hair to be sheared efficiently.

According to this invention having the above configuration, the following effects can be obtained.

The rib A that divides the block surface is a wavy curved rib like a gentle S-shape, and the hair introduction holes 3. 4.
5. 6. 7 along the long axis direction, and a large number of these holes are arranged on the block surface, so that the square block surface can not only evenly distribute the pressing force received at the center of the outer cutter when in use, but also the force on each block surface. Hair introduction holes 3, 4, along the dividing rib A
Due to the arrangement of 5, 6, and 7, they are dispersed along the radial direction, which allows the entire outer blade to be soft and deformed toward the center, increasing the feel on the skin, and having long holes in the direction of deformation of the outer blade. Since the hair itself can be deformed, the efficiency of introducing long hair can also be increased.

In particular, when the dividing rib A is not a gently wavy shape but a single circular arc surface, the pushing force that spreads and disperses from the center of the outer blade to the outer periphery has directionality, resulting in distorted deformation depending on the number of divisions, resulting in cracking of the outer blade. However, in the case of the wavy curved rib which is represented by a loose S-shape as in the present invention, the holes are dispersed depending on the position and number of holes on the outer periphery, so local deformation can be prevented. The outer blade has good sliding contact with the inner blade and has excellent sharpness and good contact with the skin.

Furthermore, the long axis a of the holes 3, 4, 5, 6.7.

By arranging b, C, and d along the wavy curved base line rib A, the arrangement of the holes in the radial direction from the center block of the outer cutter to the periphery will always be in the opposite direction. This allows the scissor angle with the inner blade to be continuously increased or decreased, allowing smooth introduction of long hair in a disordered direction, and promoting efficiency in shearing long hair.

[Brief explanation of drawings]

FIG. 1 is a plan view and a sectional view of the blade portion of an embodiment of this invention. 3.4...Long hole group, 5...Short hole group, 6
, 7... Hair introduction hole, 5a... Part of short hole group, A... Division rib, B... Each block surface.

Claims (1)

[Scope of utility model registration request] The entire outer blade surface is equally divided into a plurality of approximately triangular block surfaces B, and the dividing ribs A between the block surfaces B are wavy and curved, and each block surface has a large number of hair introduction holes 3.
, 4, 5, 6.7, the long axis direction is a wavy curved rib A
The outer blades of an electric razor are arranged along the following lines.