JPS6038456Y2 - electric razor blade - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a blade part of an electric shaver.

[Prior art]

Conventionally, in an electric shaver in which an inner cutter slides into contact with the inner surface of an outer cutter that has a large number of openings for introducing whiskers, the cutting edge angle and the inner cutting edge angle of the cutting edge of the outer cutter part that faces the direction of movement of the inner cutter are was constant.

In addition, in electric razors that have a top part on the outer blade, the top part is in most contact with the skin, but the cutting condition is not different from the blade area other than the top part, and the finish shave is good at the top part. It was impossible to do so.

In addition, due to the strength of the outer cutter, the dimensions (especially the width dimension) of the bone part of the outer cutter cannot be set too large due to the shaving condition taking into account the hole area ratio of the outer cutter, etc. Increasing the angle reduces the substantial width of the bone (or rather, the volume of the bone), which generally weakens the bone.

As the forces such as pressure and pull that occur during shaving act on the top of the outer blade, various stresses such as bending stress and tensile stress are generated at the end of the outer blade, which serves as the fixed end of the beam. The strength of the edge portion is extremely weak, and it is virtually impossible to set the above-mentioned cutting edge angle small even near the edge of the outer blade.

〔the purpose〕

The present invention focuses on these points, and allows for the best shaving condition at the top of the outer blade, which has the greatest chance of contact with the skin, for a final shave. This provides a blade with high practical value without sacrificing strength.

〔Example〕

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 shows an embodiment of a reciprocating electric shaver, FIG. 2 is a sectional view taken along line A--A in FIG. 1, and FIG. 3 is a plan view of FIG. 2.

In each figure, 1 is Ni, Ni-C. It is a flexible thin outer cutter made of stainless steel or the like and made by press working, electroforming, corrosion processing, etc. so as to have a large number of small holes 2 for introducing whiskers.

The outer cutter 1 is fixed to an outer cutter frame 3 and attached to a main body case 4.

Inside the main body case 4, a reciprocating vibrator 5 protrudes from a rotary motor, an electromagnetic motor, a piezoelectric element, etc. (not shown), and an inner cutter 7 is pushed against the inner surface of the outer cutter 1 by an inner cutter spring 6. The inner cutter 7 is made to reciprocate (in direction P) while being in pressure contact.

The outer cutter 1 and inner cutter 4 are shown in an enlarged view in FIG. 4.

In the outer cutter 1 shown in FIG. 4, the small hole 2 is formed by the bone portion 8, and the cutting edge angle α of the cutting edge 8a facing the reciprocating direction P of one inner cutter 7 is the cutting edge angle α of the other similar cutting edge 8b. Although it is at the same angle as α', as shown in Figure 3, the top part of the outer cutter 1 is 0.
．． In other words, in the case of Figures 1 and 3, this is the top of the arch center line of the outer cutter 1 and is the part that comes into contact with the skin the most, but the edge angles α and α' near this peak are different from those of the other outer cutters. It is the smallest with respect to the outer blade ends 1a and 1a, which are the attachment points to the outer frame 3.

That is, the cutting edge angles α and α' become thicker in the direction from the apex 0 down the arch of the outer cutter - in the R and R' force directions in FIG.

Therefore, the resistance when cutting the beard is reduced at this top portion, that is, the part most likely to come into contact with the skin, and the beard can be cut sharply and shortly.

Moreover, there is no problem with the strength of the outer blade ends 1a, la.

In addition, as shown in Fig. 4, the inner cutter 7 has the cutting edges 7a and 7b with a right angle or an acute angle, and the inner cutter edge angles β and β' at the position corresponding to the top of the outer blade are set at a angle higher than that at other parts. When it is small, in combination with the edge angles α and α′ of the outer blade, the beard cutting at the top of the outer blade becomes sharper, allowing the beard to be cut short and a final shave to be possible.

8d is a concave portion of the outer cutter for reducing sliding resistance with the inner cutter.

In addition, as shown in Fig. 3, the outer cutter 1. The size of small hole 2 is 0 at the top.
may be set to a minimum, and gradually increased in the R and R' force directions.

In addition, the small hole 2 near the outer blade center line N in the inner blade reciprocating direction P is made the smallest, and the small hole is formed to become larger as it goes in the force direction of Q, Q' at the edge of the force direction that is away from the N line. You may.

In the above case, the smallest small hole 2 is provided at the point where the outer blade comes into contact with the skin the most, so there is less movement of the beard when cutting the beard, and it is possible to cut the beard shorter, making it possible to cut the beard shorter. is considered to be in good condition.

Further, by increasing the thickness of the outer blade at the small portion of the small hole 2 or widening the bone width mainly on the side of the reciprocating movement direction P, the strength of the outer blade at the top portion is improved.

5 and 6 show other embodiments of the outer cutter and the inner cutter.

In FIG. 5, the cutting edge angle α on one cutting edge 8a side of the outer cutter bone portion 8 is made small, and the cutting edge angle α′ on the other cutting edge 8b side is made large. 8
The decrease in strength can be compensated for by increasing the cutting edge angle α'.

Further, the cutting edge angles β and β' of the cutting edge 7a and the other cutting edge 7b of the inner cutter 7, which perform a shearing action with the cutting edge 8a, respectively, are made to correspond to the cutting edge angles α and α' of the outer cutter, and the cutting edge angle α In response to an increase in α' due to a decrease in the angle β', the cutting edge angle β' is made small to improve the shearing action on the cutting edge 8b and cutting edge 7b sides.

At this time, in order to ensure the strength of the inner cutter 7 due to the smaller β' in the inner cutter 7, β is increased.

In order to ensure the strength of the bone portion 8 of the outer cutter 1, the cutting edge portion 8a is shown in FIG.
is formed slightly downward, and a rising portion 8c is formed above it.
This is the side that established the .

In both FIGS. 5 and 6, the cutting edge angles α, α', β, and β' are the smallest at the top of the outer cutter, similar to FIG. 4.

FIG. 7 and FIG. 8 show other outer blade configurations corresponding to FIG. 1 in a reciprocating electric shaver.

In FIG. 7, the outer cutter 8 forms a plurality of ridges, and a guide portion 3a fixed to the outer frame 3 is arranged in the center of the outer cutter 8 to form the plural ridges.

In this case, the top portion is the top portion of each arch ridge and is 0.0 above the center line of the outer blade.

FIG. 8 is the same as FIG. 7 except that 0 and 0 are not parallel.

This top portion is on the 0, 0 line on the outer cutter as in FIG. 7.

FIG. 9 shows a rotary electric shaver, and FIG. 10 is a plan view thereof.

11 is an outer cutter, 12 is an outer cutter hole, 13 is an outer frame, 14 is a main body case, 15 is a motor joint, 16 is a plate-shaped inner cutter spring, and 17 is an inner cutter.

In this case, the top of the outer cutter is on the rotation center 0.

The cross sections of the outer cutter and inner cutter are as shown in Fig. 11, and the difference from the reciprocating type is that the inner cutter 17 rotates only in one direction of movement T, so the outer cutter tip 18a faces the direction of movement T of the inner cutter 17.
, and the inner cutting edge 17a, it is only necessary to consider one of them.

The relationship in which each of the cutting edge angles α and β is the smallest only at the top of the outer cutter is the same as in the above embodiment.

12 and 13 show the form of the values of the outer cutter 11. FIG.

In FIG. 12, a central recess 11a is provided on the outer blade centerline S, and a corner part 11b with a long hole arranged on the outer wall thereof,
In the case where the top part is on the 0 line on the outside, FIG. 13 shows a case where there is a central recessed part 11a on the outer cutter center line S but there is no corner part, and the top part is the 0 part.

In addition, if the outer edge of each outer blade, especially near the attachment point to the outer frame, is thicker than the top (preferably gradually changed), the strength of the outer blade edge will be further improved. .

〔effect〕

As described above, the present invention is designed to adjust the cutting edge angle of the cutting edge of the bone part of the outer cutter that is opposite to the movement direction of the inner cutter, or the cutting edge of the outer cutter and the inner cutter at the top of the outer cutter where the skin is closest to the skin. Since the cutting edge angle has been minimized, the beard can be cut with less resistance and the user can enjoy the sharpness of the cut.In particular, the ability to cut the beard short makes it possible to finish the shave.

Furthermore, since there is no need to unnecessarily reduce the edge angle of the outer blade edge, there is no reduction in the volume of the bone portion due to a reduction in the edge angle, and therefore the bone portion is attached to the outer frame with sufficient strength. This invention makes it possible to provide a particularly useful electric shaver.

[Brief explanation of drawings]

Each figure shows an embodiment of the present invention, FIG. 1 is a sectional view of the main part of a reciprocating electric shaver, FIG. 2 is a sectional view taken along line A-A in FIG. 1,
Fig. 3 is a plan view of Fig. 2, Fig. 4 is an enlarged sectional view of the outer cutter and inner cutter, Fig. 5 is an enlarged sectional view of the other outer cutter and inner cutter, and Fig. 6 is an enlarged sectional view of the other outer cutter and inner cutter.
The figure is an enlarged sectional view of the outer cutter, FIGS. 7 and 8 are sectional views of other embodiments corresponding to FIG. Plan view of figure 9, 1st
Figure 1 is an enlarged sectional view of the outer cutter and inner cutter, Figures 12 and 13.
The figure shows a sectional view of the outer cutter in a different form from the outer cutter of FIG. 9. 1.11...Outer cutter, α, α...Blade angle of outer cutter bone, 0...Top of outer cutter, 7,17.
...Inner cutter, 8.18...Bone part of outer cutter, β
, β′...Inner cutting edge angle.

Claims (1)

[Scope of utility model registration request] A blade portion of an electric shaver characterized in that a cutting edge of the outer blade bone portion located at the top of the outer blade that faces the movement direction of the inner blade has a minimum cutting edge angle.