JPS6026778Y2 - Rotary electric razor outer blade - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotary electric shaver equipped with a dome-shaped outer cutter.

Conventional razors of this type have a circular annular rib integrally formed in the center of the dome-shaped outer blade, and a large number of long holes intersecting this rib are formed to remove long hair that lies prone in the rib part. Some attempts have been made to raise the hair and then trap it efficiently in the long holes, but because the ribs are circular, even if the outer blade is moved vertically and horizontally, the long hairs tend to escape along the circumferential direction of the ribs. A sufficient hair-catching effect could not be achieved.

This idea was developed by forming the ribs into a polygonal shape.
In addition to improving the ability to capture long hair, the mechanical strength of the ribs in the direction in which they are pressed against the skin is improved by arranging the long holes at positions other than the intersections of each side of the ribs forming a continuous polygon. It is designed to maintain the waist and prevent the skin from sagging when the skin tightening action is strong.

An embodiment of this invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the head of a rotary electric shaver equipped with an outer cutter according to this invention, and in the figure, 1 is an inner cutter holder;
2 is an inner blade insertion hole formed in the inner blade holder 1, 3 is an inner blade inserted into the inner blade insertion hole 2, 4 is a support spring that elastically supports the inner blade 3 so that it can move up and down, and 5 is an outer blade holder. The outer cutter base 7 is formed by a well-known method such as electroforming.
A large number of cutting holes 8 are formed in the cutting edge.

9 is a rotational drive shaft of the inner cutter holder 1.

As shown in FIG. 2, a polygonal, for example, quadrangular rib 10 is formed in the center of the outer cutter base 7, and the rib 10 is further provided with intersections of each side of the rib 10. A large number of elongated holes 11 intersecting the ribs 10 are formed at positions other than the ribs 10.

In this way, the rib 1 formed at the center of the outer cutter base 7
Since 0 is a polygon, not only long hairs are brushed on the ribs 10, but also long hairs can be brushed on the inner corners 12 of the ribs 10 by shearing while moving the outer blade 5 vertically and horizontally against the skin. On the other hand, as shown by the arrow in FIG. 3, the particles are scraped together and their escape is prevented, so that they are efficiently captured in the nearby elongated hole 11 at this position.

Furthermore, as mentioned above, the long holes 11 provided in the ribs 10 are provided in the linear side portions of the polygonal shape, and are not provided in the intersecting portions. This is because it is necessary not only to maintain the condition, but also to prevent the skin from sagging when the squeezing effect is strong.

By the way, the elongated hole 11 formed to intersect with the rib 10 is
Its axis 1', l'□~1' as shown in Figure 4.
3 is the virtual radiation l of the outer blade base 7, 11 to 1.1? By setting the angle so that it intersects with , the intersection angles θ, θ□ to θ3 are configured as scissor angles.

However, with conventional circular ribs, the scissor angle is the same even at positions shifted by 11 in the rotational direction of the inner blade, resulting in biased shearability for human hair and fine hair. Become.

On the other hand, if the rib 10 is polygonal as described above,
As the inner cutter 3 rotates, the scissor angle θ changes at each position in the rotational direction, which has the effect of shearing thick and thin hair evenly and giving a good finish. .

In the above embodiment, the annular rib 10 has a quadrangular shape, but it is preferable that the number of corners of this polygonal shape is up to 8.
If it exceeds this value, the raising effect due to the skin squeezing action at a corner portion will be reduced.

For this reason, a rectangular shape is most preferable.

Furthermore, this quadrilateral shape can also be transformed into a rhombus or trapezoid. For example, in a rhombus shape, by making the opposite angles the same and the adjacent angles different, one corner is made acute and the other obtuse, resulting in a uniform corner. The degree of tightening of the skin in different parts of the body is different, and for areas with relatively weak elasticity of the skin, such as tufts, one part of the sharp corner is used, rather than increasing the degree of tightening. For soft areas, the degree of squeezing action can be weakened to improve the napping effect without impairing the texture.

Further, the polygonal shape may be, for example, a star shape as shown in FIG. 5, and even if the number of angles is 8 or more, the skin narrowing effect can be exerted.

In addition, by forming each of the straight sides as a part of a very gentle circular arc, the feel to the skin can be further improved.

Furthermore, the elongated hole 11 not only completely straddles the rib 10, but also extends from the center side of the outer cutter 5 or from the sixth hole as shown in FIG.
By setting the opening length from the outer periphery to the top of the rib 10 as shown by the broken line in the figure, long hair raised by the rib 10 can be reliably caught and appropriate rigidity can be maintained.

As described above, this invention has a continuous polygonal rib in the center of the dome-shaped outer cutter base, and long holes are provided on each side of this rib, excluding the intersections, to remove long hair. Not only can the above-mentioned ribs be used to raise the hair, but the raised long hair can be gathered into the inner corners of the ribs and efficiently captured in the long holes without escaping, and the mechanical strength of the polygonal ribs can be maintained and the hair can be removed while cutting the beard. It is possible to prevent injuries caused by sagging.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the head of a rotary electric shaver equipped with an outer cutter according to this invention, Fig. 2 is a plan view of the outer cutter, and Figs. 3 and 4 are explanatory diagrams of the operation of the main parts. , FIG. 5, and FIG. 6 are explanatory diagrams of other embodiments. 7...Outer blade substrate, 10...Polygonal rib, 11...Long hole, 1...Virtual radiation,
1'...Axis of long hole 11.

Claims (2)

[Scope of utility model registration request] (1) An outer blade of a rotary electric shaver in which a continuous polygonal rib 10 is formed in the center of a dome-shaped outer blade base 7, and long holes 11 are provided at positions other than the intersections of each side of the rib 10. . (2) The rotary type according to claim 1, in which the elongated holes 11 are arranged in a direction in which the axis 1' of the elongated holes 11 intersects the virtual radiation 1 from the center of the outer cutter base 7. The outer blade of an electric razor.