JPS5937987B2 - Reciprocating electric razor blade structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a reciprocating electric shaver blade.

Conventionally, the structure of reciprocating electric razor blades as described above is
As shown in FIGS. 1a and 1b, the slit-like cutting hole group 6' extending from the concave or convex curved strip 4' of the outer cutter 1' to the flat part 9' of the outer cutter 1' and the flat part groove are provided. The boundary part A' with the blade hole group 7'
is formed in a straight line substantially parallel to the reciprocating sliding direction of the inner cutter, and has high rigidity.

Therefore, when the outer cutter 1' is bent into a semicylindrical shape, the boundary portion R is less bent than other portions and becomes almost flat, so that the fourth edge is formed near the boundary portion A'.
As shown in the figure, a gap δ is generated between the outer cutter 1' and the inner cutter 2', resulting in poor cutting quality.

The state in which such a gap δ occurs will be explained in detail with reference to the drawings.

As shown in FIG. 2, the portion of the outer cutter 1' near the bent strip 4' is pushed up by the inner cutter 1 from the position shown by the imaginary line to the position shown by the solid line. The interference equation γ between the outer cutter 1' and the outer cutter 1' is thicker than that at the flat portion 9'.

Since the vicinity of the bent strip 4' is strongly interfered with by the inner cutter 2, the rigidity of the portion near the bent strip 4' is increased in advance in order to ensure the strength of the outer cutter.

Furthermore, since the bending condition 4' is provided, the rigidity in this vicinity increases.

The rigidity of the boundary portion A' is greater than that of the vicinity of the bent strip 4', which has greater rigidity.

In other words, the order of bending rigidity is the boundary portion A', the bent strip portion 4', and the flat portion 9'.

For this purpose, as shown in FIG. 3, near the bent strip 4',
The radius of curvature ρ1 of each of the boundary portion A' and the plane portion 9'.
ρ2 and ρ3 have the relationship of ρ2〉ρ1〉ρ3, especially ρ
2 is extremely thick (the boundary portion A' is almost flat).

As shown in FIG. 4, a large gap δ is generated near the boundary portion A' between the inner cutter 2' and the outer cutter 1', resulting in poor cutting quality at this location.

The present invention has been made in view of these conventional drawbacks, and its purpose is to eliminate the boundary between the slit-shaped blade hole group extending from the bent strip portion to the flat portion and the blade hole group in the flat portion. By forming the inner cutter in a zigzag shape in the reciprocating sliding direction, it is possible to reduce the rigidity along the long boundary part in the reciprocating sliding direction of the inner cutter, which improves the degree of adhesion between the inner cutter and the outer cutter. We have developed a reciprocating electric razor blade structure that improves sharpness, reduces local interference between the inner and outer cutters, suppresses noise, and extends the life of the inner and outer cutters. It is about providing.

The present invention will be described in detail below based on illustrated embodiments.

Reference numeral 1 denotes a flat outer cutter, which is bent into a semicylindrical shape and attached to the electric shaver main body 3.

The outer cutter 1 is provided with one or more bent stripes 4 over its entire length in parallel to the reciprocating sliding direction of the inner cutter 2.

This bent strip 4 may be concave or convex.

FIG. 11 shows a convex case, and all other drawings show a concave case.

Slit-shaped blade holes 6 are arranged in a row in the reciprocating sliding direction of the inner cutter 2 extending from the bent strip 4 to a flat portion 9 that is a portion of the outer cutter 1 other than the bent strip 4.

On the other hand, the inner cutter 2 is formed by arranging a large number of blades 10 that are perpendicular to the sliding direction and each of which has an arch shape at the upper end. 4, a corresponding part 5 is provided in a concave or convex shape, and when the bent strip part 4 is concave, the corresponding part 5 becomes a concave part and is bent into the concave part 5. When the striped portion 4 is located and the bent striped portion 4 is convex, the corresponding portion 5 has a convex shape, and the corresponding portion 5 having a convex shape is located within the convex bent striped portion 4.

The flat part 9 of the outer cutter 1 is provided with a hole group 7 consisting of a small hole 7a and a long hole 8.

These small hole-like blade holes 7a and long hole-like blade holes 8 are both formed as a part, and the slit-like blade holes 6 group, the small hole-like blade holes 7a group, and the long holes provided in the bent strip 4 are connected to each other. The 8 groups of shaped blade holes are the inner blade 2
It is divided and arranged in a direction perpendicular to the direction of reciprocating sliding.

In the embodiment shown in FIG. 7, in the direction orthogonal to the reciprocating sliding direction of the inner cutter 2, a bent strip 4 and a group of 6 slit-shaped blade holes attached thereto are provided at the center, and small hole-shaped blade holes 7a are provided on both sides. 8 groups of elongated blade holes on both sides of the group, and 8 groups of elongated blade holes on both sides of the group, and further on both sides / 9
This is an example in which a group of blade holes 7a are arranged.

When the reciprocating electric shaver is used, it is moved in a direction perpendicular to the sliding direction of the inner cutters 2.

Therefore, considering one point on the skin, the portion of the outer cutter 10 that contacts this one point moves in a direction perpendicular to the sliding direction of the inner cutter 2.

The blade holes change from a long hole-like blade hole 8 to a small hole-like blade hole 7a, and then to a slit-like blade hole 6.

Although long whiskers cannot be introduced into the small hole-shaped blade hole 7a, short whiskers or whiskers that could not be cut short in the long-hole-shaped blade hole 8 and the slit-shaped blade hole 6 can be caught and cut into the inner blade 2. Cut it shorter in between and shave it.

In the elongated blade hole 8, long whiskers that could not be introduced into the small blade hole 7a are introduced and cut.

For example, when the bent strip 4 is concave, the slit-shaped cutter hole 6 extending from the bent strip 4 to the flat surface 9 is located at a place where the bent strip 4 does not touch the surface of the outer cutter 1, as shown in FIG. The skin of the blade is stretched to raise a long beard 11 or a curly beard 11, and this is introduced into the slit-shaped blade hole 6.

FIG. 12 shows a state in which the beard 11 sequentially moves from the right side to the left side as the electric shaver is moved, and is cut by the inner blade 2.

Here, the slit-shaped cutting hole 6 is inclined with respect to the bent strip 4 in the flat part 9, and has a scissoring angle with respect to the blade 10 of the inner cutter 2, thereby improving cutting quality and improving the cutting quality of the outer cutter 1. This is intended to prevent interference with the inner cutter 2.

It is preferable that the angle θ formed between the bent strip portion 4 and the flat portion 9 be an obtuse angle in order to ensure the degree of adhesion between the outer cutter 1 and the inner cutter 2.

In the embodiment shown in FIG. 7, the slit-shaped blade hole 6 is arranged in a direction substantially perpendicular to the sliding direction of the inner cutter 2 and substantially parallel to the long slit-shaped blade hole 6a. The long slit-shaped blade holes 6a and the short slit-shaped blade holes 6b are arranged alternately in the sliding direction of the inner cutter 2, and the long slit-shaped blade holes 6a and the short slit-shaped blade holes 6b are arranged alternately in the sliding direction of the inner cutter 2. The end of the hole 6a on the flat side and the end of the short slit-shaped blade hole 6b on the flat side are bent to opposite sides.

And between the long slit-shaped blade hole 6a, the short slit-shaped blade hole 6b, and the small hole-shaped blade hole 7a, that is, the slit-shaped blade hole 6
The boundary portion A between the blade hole group 7 and the blade hole group 7 is in a zigzag shape with respect to the inner blade sliding direction, as shown in FIG. 7 and an enlarged view of FIG.

In this way, the boundary part A is formed in a zigzag shape with respect to the reciprocating sliding direction of the inner cutter 2, so that the rigidity of the long boundary part A in the reciprocating sliding direction of the inner cutter 2 is adjusted so that the boundary part A is linear. It can be made smaller than what is currently available.

This means that when the outer cutter 1 is bent into a semicylindrical shape, the radius of curvature of the boundary portion A and the vicinity thereof can be reduced, and the degree of adhesion between the outer cutter 1 and the inner cutter 2 can be improved.

FIG. 13 shows another embodiment of the boundary portion A, which has a sine curve shape in the sliding direction of the inner blade.

Thus, in the present invention, the outer cutter, which can be bent into a semicylindrical shape, is provided with a bent strip in parallel to the reciprocating sliding direction of the inner cutter, and the slit-shaped cutter hole extending from the bent strip to the flat surface is formed in the outer cutter. Although long beards and curly beards can be introduced and cut efficiently using the bent strips and the slit-like blade holes, the present invention particularly provides a method for cutting long beards and curly beards from the bent strips to the flat section. The boundary between the slit-shaped blade holes and the flat blade hole group is formed in a zigzag shape with respect to the reciprocating sliding direction of the inner cutter, so that the rigidity of the long boundary portion in the reciprocating sliding direction of the inner cutter is improved. can be made smaller than the conventional one, which has a straight line along the reciprocating sliding direction of the inner cutter, and as a result, the radius of curvature of the boundary part and the vicinity thereof can be made smaller, and the radius of curvature between the inner cutter and the outer cutter can be made smaller. It can improve adhesion and cutting quality, and in addition, it can reduce local interference between the inner and outer cutters, suppress local sliding noise and uneven wear, and last for a long time. It can be used stably for a long time.

In addition, the ends of the slit-shaped blade holes on the flat side are bent alternately to the opposite side, so that the boundary between the slit-shaped blade holes and the blade holes in the flat part is zigzag in the reciprocating sliding direction of the inner cutter. Since it is formed in a shape, it is possible to introduce long beards lying facing each other into the slit-shaped blade hole without leaking, and it has the effect that there is no uncut part of the long beards.

[Brief explanation of the drawing]

Figures 1a and b are front and side views of the conventional outer cutter;
The figure is a partially broken side view showing the effect of the above, Figure 3 is an explanatory diagram showing the radius of curvature of the same, Figure 4 is a partially enlarged sectional view of the same, and Figure 5 is an example of an embodiment of the present invention. 6a and b are perspective views of the outer cutter and inner cutter as above, Fig. 1 is a front view of the outer cutter as above, Fig. 8 is a vertical sectional view as above, and Fig. 9 is as above. 10a and 10b are partially enlarged front views and sectional views of FIG. 7, FIG. 11 is a sectional view showing an example of the convex bent strip of the same as the above, and FIG. 12 is the same as the above. 13 is a schematic front view showing another embodiment of the boundary portion of the same, in which 1 is an outer cutter, 2 is an inner cutter, 4 is a bent strip, and 5 is a In the corresponding parts, 6 is a slit-shaped blade hole, 1 is a group of blade holes, 9 is a plane part, and A is a boundary part.

Claims (1)

[Claims] 1 A concave or convex bent line parallel to the reciprocating sliding direction of the inner cutter is provided on a flat plate-shaped outer cutter that can be bent freely in a semicylindrical shape, and a portion of the outer cutter other than the bent line is provided from the concave or convex bent line. In the structure of a reciprocating electric shaver blade in which the outer blade is provided with a group of slit-shaped blade holes that reach a plane part, the ends of the flat part side of the slit-shaped blade holes are alternately bent to the opposite side to form slit-shaped blade holes. A reciprocating electric shaver blade structure characterized in that a boundary between a group of blade holes and a group of blade holes in a plane part is formed in a zigzag shape with respect to the reciprocating sliding direction of an inner blade.