JPS6124948B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric shaver blade comprising a comb-shaped fixed blade and a comb-shaped movable blade that is reciprocated with respect to the fixed blade.

FIG. 1 shows an electric razor for shaving unwanted hair and eyebrows, which is equipped with a so-called trimmer type electric razor blade as described above. 10, and a drive rod 14 that reciprocates by the power of a motor as shown in FIG. The drive rod 14 and the movable blade 2 are connected to each other by attaching the blade block 13 to the attachment body. FIG. 3 shows the blade block 13. A pair of square bosses 16, 16 are protruded from the inner surface of the blade base 15, and the engagement hole 18 of the presser spring 17 is fitted into the square boss 16. , then insert the square boss 1 into the guide hole 19 of the movable blade 2.
6, and then insert the square boss 16 into the hole 20 of the fixed blade 1.
This blade block 13 is assembled by inserting the fixing pin 21 into the tip end surface of the square boss 16 in accordance with the above. A comb-shaped cutting edge portion 3 with cutting grooves 5 and 6 arranged along the entire length of one side edge and a part of the other side edge, respectively,
A fixed blade 1 and a movable blade 2 each having a number 4 formed therein.
In this case, the connecting hole 22 at one end of the movable blade 2 is connected to the drive rod 14.
As the movable blade 2 is reciprocated by being connected to Hair such as beards, unnecessary hair, eyebrows, etc. caught in the blade grooves 5 and 6 is cut off.

By the way, the opening width of the blade grooves 5 and 6 is usually larger than the inner width, as shown in FIGS. 4 and 6, in view of the scissor angle for introducing and cutting hair. However, this poses the following problems. That is, as shown in FIG. 5, the hair 7 may not be cut from its root. As is clear from FIGS. 6 and 7, this is because the amount of skin 8 that enters the blade groove 5 of the fixed blade 1 located on the skin 8 side is smaller than that on the opening side due to the difference in the width dimension of the blade groove 5. This is because the dimension from the cutting surface, which is the sliding surface between the fixed blade 1 and the movable blade 2, to the root of the bristles 7 is the dimension l near the opening of the blade groove 5. This is because the dimension l ₁ on the deeper side is larger than ₀ , and the further the hair is cut in the depths of the blade groove 5, the shorter the hair will not be cut from the root. The same applies even if the blade that comes into contact with the skin is not a fixed blade but a movable blade.

The present invention has been made in view of these points, and its purpose is to provide an electric shaver that can cut hair short from the root in any part of the blade groove.

To explain the present invention below, the present invention is a trimmer-type electric shaver blade that is characterized in that the thickness of the comb-shaped cutting edge of the blade that comes into contact with the skin is thicker at the tip and thinner at the base. However, the cutting surface is positioned at a position that matches the amount of protrusion of the skin into the blade groove, which is determined by the shape of the blade groove.

To explain the present invention in detail based on the illustrated embodiments, the electric razor blade shown in FIGS. 1 to 3 has the following features:
The blade edge part 3 of the fixed blade 1 on the side that contacts the skin 8 has a comb-like blade groove 5 arranged in rows, and
As shown in the figure, by grinding one surface of the movable blade 2 that is in sliding contact with the cutting edge portion 4 into a tapered shape, the blade thickness t ₂ at the tip becomes thicker and the blade thickness t ₁ at the base side becomes thinner. That's what I do. Moreover, as shown in FIG. 9, the movable blade 2 is designed so that the blade thickness of the blade edge portion 4 is thicker at the base than at the tip. Therefore, if the fixed blade 1 is pressed against the skin 8 now, the amount of the skin 8 that protrudes into the blade groove 5, where the opening width is wider than the inner width, is larger at the opening than at the inner part. The dimensions from the cutting surface to the skin 8, which is the sliding contact surface of the respective cutting edges 3 and 4 of the fixed blade 1 and the movable blade 2, that is, the dimensions l ₀ and l ₁ from the cutting surface to the root of the bristles 7 are , as shown in FIG. 10, is substantially the same regardless of the opening side or the deep side of the blade groove 5, and the bristles 7 are always cut short from the root.

FIGS. 11 and 12 show other embodiments. This is done by making the cutting edge 3 of the fixed blade 1, which will be located on the skin 8 side, slightly bent toward the movable blade 2 side, and then extending the side that contacts the skin 8 to the X-X plane in the figure. By grinding, the blade thickness of the blade edge part 3 of the fixed blade 1 is made to be gradually thicker at the tip than at the root, and here, the blade thickness of the movable blade 2 is approximately the same at the tip and root. It is said that In this case as well, the 13th
As shown in the figure, even in the deep part of the blade groove 5, the hair 7 is cut short from the root.

In each of the above embodiments, the fixed blade 1 is attached to the skin 8.
However, in the case where the movable blade 2 contacts the skin 8, the thickness of the cutting edge portion 4 of the movable blade 2 may be made thicker at the tip than at the base.

As described above, in the present invention, the amount of protrusion from the skin into the blade groove, which is caused by the shape of the blade groove into which the bristles are introduced, differs between the opening side and the deep side of the blade groove. This is due to the difference in blade thickness between the tip and the base of the blade that comes into contact with the skin, that is, due to the unique arrangement of the cutting surface that is the sliding contact surface between the fixed blade and the movable blade. It is designed so that the hair can be ignored, and the hair can always be cut short from the root.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an electric shaver equipped with a trimmer type electric shaver blade, Fig. 2 is an exploded front view of the same attachment, Fig. 3 is an exploded perspective view of the same blade block, and Fig. 4 is a conventional example. 5 is a cross-sectional view of the same, FIG. 6 is a plan view of the same, FIG. 7 is a longitudinal sectional view of the same, and FIG. 8 is a perspective view of a fixed blade in an embodiment of the present invention. 9 and 10 are longitudinal cross-sectional views of the same as above, FIG. 11 a and b are longitudinal cross-sectional views of other embodiments, FIG. 12 is a perspective view of the fixed blade of the same as above, and FIG. It is a diagram. 1 is a fixed blade, 2 is a movable blade, 3 and 4 are blade edges, and 5 and 6 are blade grooves.

Claims (1)

[Claims] 1. In an electric razor blade consisting of a comb-shaped fixed blade and a comb-shaped movable blade that moves reciprocally with respect to the fixed blade, the blade groove in the blade on the side of the fixed blade and the movable blade that comes into contact with the skin. An electric razor blade characterized in that the edge of the blade is thicker at the tip and thinner at the base.