JPS5841077B2 - electric razor no kiwazoriba - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of the cutting edge of an electric razor's shaving blade, and particularly to the shape of the cutting edge that can easily catch hair and cut it reliably.

Traditionally, this type of cutting blade has been customary to have a rectangular shape with parallel cuts, as shown in Figure 1, but this has poor grip on whiskers and tends to escape. It is necessary to perform a measuring or shaving operation, and since the pitch of the tip of the cutting edge is so fine that it is not possible to process it into a sufficiently rounded shape, there is a drawback that the cutting edge does not feel good against the skin and causes discomfort during use.

The present invention aims to eliminate these drawbacks and achieve better hair catching and cutting effects, and its gist is that it is composed of a fixed blade 1 and a movable blade 2, both of which have comb-like cutting blades. The cutting edge 4 of the fixed blade 1 has a bulge having the maximum width between the base and the leading edge, and an inclined part is provided from the bulge to the base and the leading edge. Formed so that the base and tip are tapered,
It is characterized by having a radius at the leading edge, and its basic purpose is to improve the capture of whiskers, ensure reliable cutting of whiskers, and improve the feel to the skin.

The present invention will be described below with reference to an embodiment shown in the drawings. In each figure, 1 is a fixed blade, and 2 is a movable blade. Structurally, the movable blade 2 is arranged in close contact with the lower surface of the fixed blade 1, and the fixed blade 2 is a movable blade. The blade 1 and the movable blade 2 each have a groove 3 and a comb-shaped cutting edge 4, and are designed to be able to capture and cut hair.

The present invention is particularly based on an improvement in the shape of the cutting edge 4 of the fixed blade 1, which is basically configured to be thin at the base 5 and thick at the bulge 6, as shown in FIG. θ1 shown in FIG. 3 for the base width X of the base 5 of the blade 4
At the point where the bulge 6 becomes the maximum width Y of the cutting blade 4, it becomes thinner with an inclination of θ2 toward the leading edge 7, which is the same as the width of the cutting blade 4. It is desirable to form them almost symmetrically from side to side.

In this configuration, θ1. The slope formed by θ2 does not need to be particularly linear in its locus, and may be curved. Desirably, the locus of the slope formed by θ1 is a concave curvature, and the locus of the slope of θ2 is a convex curvature. The best results can be obtained by doing so.

Further, the leading edge 7 is configured in a rounded shape so as to make smooth contact with the skin, thereby improving the feel and the above-mentioned θ1. The apex 8, which is the intersection of θ2, is also formed in a rounded shape so as not to hinder the effect of introducing whiskers in the cutting edge width Z created by the cutting edge 4 and the cutting edge 4'.

However, in the present invention, since the tip is particularly thick, the width Z of the cutting edge formed by the apex 8 of the cutting edge needs to be designed to be somewhat wider than the conventional cutting edge, and it has an opening angle θ3. Therefore, the radius at the leading edge 7 can be easily formed by processing such as puffing.

The above is the geometric configuration of the present invention. To explain in more detail the whisker trapping effect and cutting effect based on this configuration, the whisker trapping effect is different from that of the groove 3 in the conventional structure shown in FIG. Determined by size, flat tip 9
has no effect on whisker capture.

However, in the present invention shown in FIG. 3, the opening angle θ3 is determined by the above-mentioned inclination θ2,
By adding this aperture angle θ3, it is possible to increase the capture of whiskers.

The opening angle θ3 must be an appropriate angle, and the test results show that good results can be obtained at approximately 20 to 120 degrees.

On the other hand, the whiskers captured by the scratch opening angle θ3 pass through the cutting edge width Z, which is the narrowest part between the cutting edges 4 and 4', and reach the base 5.
reach.

In such a situation, the beard is cut by the cooperation of the fixed blade 1 and the movable blade 2, but at this time, the beard is prevented from coming out again due to the inclination of θ1, which is a feature of the present invention, and the beard is cut by the movable blade 2. definitely cut.

In this case, the positional relationship between the cutting blades of the fixed blade 1 and the movable blade 2 is preferably such that the cutting blade of the movable blade 2 is located at the maximum width apex 8 of the cutting blade of the fixed blade 1 in the present invention. It produces a great effect.

The shape of the bulge 6 of the cutting edge 4 changes considerably depending on the opening angle θ3. For example, if θ3 is large, it will look like the one shown in Figure 6, and if θ3 is small, it will look like the mouth of Figure 7. It is what makes things.

In addition, the shape of the cutting edge of the present invention has a distinctive shape when viewed from above as described above, and produces a unique effect. However, in order to make the present invention more effective, the following cross-sectional shape or manufacturing method may be adopted. When used, it is possible to improve quality and reduce costs.

That is, as shown in FIG. 4, by having the cross-sectional shape of the cutting blade 4 approximately semicircular or having the corner portion 10 having a rounded shape, it is possible to easily capture whiskers from the upper surface of the fixed blade 1. .

In addition, as shown in FIG.
By providing an appropriate radius, combined with the planar special shape of the present invention, it is possible to expect better capture of whiskers, and it is possible to further improve the feel of dust against the skin during shaving.

However, these structures can be relatively easily formed using processing methods such as pressing, grinding, puffing, and electroforming.Especially in electroforming, high quality and A device that meets the spirit of the present invention can be manufactured at very low cost.

In addition, in the present invention, there is no particular specification regarding the cutting edge of the movable blade 2, and although good results can be obtained with a conventional one,
It is most desirable to use a cutting edge with substantially the same shape as the fixed blade shown in the present invention.

As described above, the present invention relates to the shape of the cutting blade 4 of the fixed blade 1, and by implementing the present invention, (a) the capture of beard can be significantly improved, so that shaving such as scratches can be done in a short time; I can do it.

(b) Once the whiskers are captured, they are prevented from escaping again, so they can be cut off reliably.

G/→ If the tip of the cutting edge has a radius, it feels good on the skin.

etc., each of which produces excellent effects for the most basic functions of a scraping blade.

[Brief explanation of drawings]

Fig. 1 is a partial plan view showing the shape of the cutting edge of a conventional scraping blade, Fig. 2 is a sectional view taken along the line a-a' in Fig. 1, and Figs. 3 to 7 show embodiments of the present invention. 3 is a partial plan view showing the shape of the cutting edge, FIG. 4 is a sectional view taken along line bb' in FIG. 3, FIG. 5 is a sectional view taken along line C-C' in FIG. 3, and FIG. 7A and 7B are partial shape diagrams according to an embodiment different from the shape of the cutting edge shown in FIG. 3. 1... Fixed blade, 2... Movable blade, 3... Groove, 4,
41... Cutting blade, 5... Base, 6... Swelling part,
7... Cutting edge, 8... Vertex of maximum width, 9... Flat part of cutting edge, 10... Corner, θ1... Inclination, θ2...
Inclination, θ3...opening angle, X...base width, Y...maximum width, Z...cutting edge width.

Claims (1)

[Claims] 1. In a cutting blade composed of a fixed blade 1 and a movable blade 2, both of which have comb-shaped cutting blades, a bulge having the maximum width is formed between the base and the leading edge of the cutting blade 4 of the fixed blade 1. A shaving blade for an electric shaver, characterized in that the sloping part is formed from the bulge to the base and the leading edge so that the base and the leading edge become thinner, and the cutting edge is rounded.