JPS6335748Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a comb-shaped fixed blade for women's electric razors, etc., and its purpose is to improve the shape of the blade tip so that long hair and loose hair can be easily shaved. shall be.

Conventionally, this type of comb-shaped fixed blade has been designed primarily to improve the contact of the cutting edge against the skin. For example, the cutting edge portion 3 shown in FIG. 1 has a straight shape up to the tip surface 3a, and the entire tip surface 3a is formed into a curved shape. Therefore, the cutting edge part 3 feels good against the skin, but it is difficult to scoop up long hair, especially sleeping hair.
These hairs are difficult to shave.

In addition, as shown in FIG. 2, at the tip of the cutting edge portion 3,
There is a tool in which the cutting edge protrusion 3 protruding from the blade surface 4 side toward the surface 6 opposite to the cutting surface 4 is formed in a stepped parallel shape (Japanese Utility Model Publication No. 57-54772), but this also has a cutting edge protrusion 3. The curved tip surface 3a of No. 3 remains irrespective of the polishing of the blade surface 4 to provide a good feel to the skin. Therefore, the protrusion 3 has a straight and flat shape between the tip surface 3a and the stepped portion 3b, and the entire tip surface 3a is formed into a curved shape, so that long hair or lying hair can be removed. It's difficult to shave because you can't scoop it up.

Focusing on this fact, this invention ensures good contact with the skin at the cutting edge and then forms the cutting edge into a shape that has the effect of scooping up and raising hair. This allows for easy shaving.

The details will be explained below based on the drawings. Third
The figure illustrates the comb-shaped fixed blade according to this invention.
1 is a comb blade portion formed at the tip of the fixed blade base 2;
is a cutting edge protrusion formed at the tip of the comb blade part 1 in a protruding shape toward the other side surface 6 on the opposite side to the blade surface 4 side.
This cutting edge protrusion 3 has a flat front end surface 7 that intersects with the blade surface 4, a flat rear surface 8 that intersects with the other side surface 6, and a convex curved tip section 9 where these front end surface 7 and rear surface 8 intersect. The angle α formed between the front end surface 7 and the blade surface 4, and the angle β formed between the rear surface 8 and the other side surface 6 are both obtuse angles, but the former angle α is smaller than the latter angle β.
For example, in the embodiment, the angle β is set to about 130° and the angle α is set to about 120°. Therefore, as shown in FIG. 4, the extensions of the front end surface 7 and the rear surface 8 intersect at the virtual point P.

To explain an example of a method for manufacturing this comb-shaped fixed blade, first, as shown in FIG. form. Next, as shown in FIGS. 6b and 6c, the comb is pressed and bent between a die 13 and a punch 14, which have uneven cross-sections and a punch 14, so that the comb blade part 1 and the sagging part 16 of the sheared cut surface 15 are on the die side. Blade part 1
A cutting edge protrusion 3 is formed at the tip of the cutting edge 3, which projects from one side 5, which becomes the cutting surface 4, toward the other side 6 on the opposite side. At this time, the front end surface 7 that intersects with one side 5 of the cutting edge protrusion 3 and the rear surface 8 that intersects with the other side 6 are formed into flat surfaces, and the angle α between the front end surface 7 and the one side 5 is formed into an obtuse angle. and the rear surface 8 and the other side 6
Process the angle to be smaller than the angle β formed by the

Finally, as shown in FIG. 6d, the tip 9 where the front end surface 7 and rear surface 8 of the cutting edge protrusion 3 intersect at the virtual point P is 1
Since the tip 9 is formed into a convex curved surface by buffing or the like, the polishing process can be simplified, and one side 5 can be flat-polished to form the comb-shaped movable blade 17. Blade surface 4 with good adhesion
By forming this, a comb-shaped fixed blade as shown in FIG. 3 can be obtained.

In such cases, the comb-shaped fixed blade should be pressed against the skin with the protruding part 3 of the comb as shown in Fig. 5.
When the movable blade 17 moves forward, long hair or lying hair is scooped up by the front end surface 7 and shaved by shearing action with the movable blade 17. Further, since the skin pressed by the blade edge protrusion 3 can escape to the rear surface 8 side of the blade edge protrusion 3, the other side surface 6 of the comb blade part 1 moves smoothly without coming into contact with the skin. Furthermore, since the tip 9 of the cutting edge protrusion 3 is formed into a convex curved surface, it will not cause any damage to the skin. In particular, the presence of the cutting edge protrusion 3 makes it possible to make the tip width H (see FIG. 4) of the cutting edge part as wide as possible, making it very comfortable against the skin. Moreover, the convexly curved tip 9 has an obtuse angle α formed between the front end surface 7 and the blade surface 4, and is smaller than the angle β formed between the rear surface 8 and the other side surface 6. The portion 3 has a generally triangular cross-section and easily bites deeply into the skin, and the front end surface 7 sufficiently exhibits the action of scooping and raising hair.

As explained above, according to this invention, a cutting edge protrusion 3 is provided at the tip of the comb blade part 1, protruding from the blade surface 4 side toward the other side surface 6 side opposite to the blade surface 4,
a front end surface 7 of the cutting edge protrusion 3 that intersects with the blade surface 4;
and the rear surface 8 that intersects with the other side surface 6 is formed into a flat surface shape, and the angle α formed between the front end surface 7 and the blade surface 4 is set to be an obtuse angle and smaller than the angle β formed between the rear surface 8 and the other side surface 6, The tip 9 of the cutting edge protrusion 3 where the front end surface 7 and the rear surface 8 intersect is formed into a convex curved shape.
Therefore, it is possible to improve the good skin contact of the cutting edge,
In addition, the cutting edge part can be deeply dug into the skin without causing damage to the skin, and long hair or lying hair can be scooped up and raised, allowing the hair to be shaved efficiently in a short time.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are both sectional views showing the cutting edge portion of a conventional comb-shaped fixed blade. Figures 3 to 6 illustrate the comb-shaped fixed blade according to this invention, where Figure 3 is a partial perspective view of the comb-shaped fixed blade, Figure 4 is a sectional view of the cutting edge of the comb-shaped fixed blade, and Figure 5. 6 is a usage state diagram of the comb-shaped fixed blade, and FIGS. 6A to 6D are manufacturing process diagrams of the comb-shaped fixed blade. 1... Comb blade part, 3... Blade tip protrusion, 4... Blade surface,
6...Other side surface, 7...Front end surface of the cutting edge protrusion, 8...
Rear surface of the cutting edge protrusion, 9... Tip of the cutting edge protrusion.

Claims (1)

[Scope of utility model registration request] A cutting edge protrusion 3 is provided at the tip of the comb blade part 1 to protrude from the blade surface 4 side toward the other side surface 6 side opposite to the blade surface 4, and the front end surface of the cutting edge protrusion 3 intersects with the blade surface 4. 7, and the rear surface 8 that intersects with the other side surface 6 are each formed into a flat surface shape, and the angle α between the front end surface 7 and the blade surface 4 is an obtuse angle and is smaller than the angle β between the rear surface 8 and the other side surface 6. A comb-shaped fixed blade for an electric shaver in which a tip 9 where a front end surface 7 and a rear surface 8 of a cutting edge protrusion 3 intersect is formed into a convex curved shape.