JPS6260118B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric shaver using flexible rectangular outer cutters stretched in an arch shape, and more particularly to an improvement in the structure of the outer cutters.

In this type of electric shaver, for example, a reciprocating electric shaver, as shown in FIG. 7, the inner cutter body 50 extends linearly from one end to the other end in the axial direction, in other words, in the reciprocating direction (direction of arrows a and b). The protruding ribs 51, 51 are formed on the outer cutter 52, and a large number of slits 5 are formed in the protruding ribs 51, 51.
3, the long hair that tends to lie down is raised by the protruding ribs 51, 51, and is captured and sheared by the slit 53.

By the way, in general, when the outer cutter is curved in an arch shape and stretched and held in the outer cutter holder, the outer cutter has the same curvature over almost the entire length in the direction orthogonal to the reciprocating direction, that is, the cutting edge line of the inner cutter body. (the state shown by the chain line in Figure 9).

However, the protruding rib 5 is attached to the outer cutter 52 as it is.
1, 51, the bending force F is reduced because the wall thickness t of each part is uniform as shown in FIG.
is absorbed by the protruding ribs 51, 51, so that the portion (center portion) 52 between the protruding ribs 51, 51
The curvature of a becomes smaller as shown in FIG. 9, and only this central portion 52a comes into contact with the cutting edge of the inner blade body 54 locally. For this reason, not only is the hair trapping property poor, but the hair is also likely to get caught. In particular, localized contact only at the center may cause this area to generate abnormal heat or crack due to uneven wear.

Therefore, the present invention makes the portion of the protruding rib formed on the outer cutter thicker than other parts so that the bending force is not completely absorbed by the protruding rib and is transmitted to the entire area of the outer cutter. By doing so, it is intended to prevent hair from biting in and uneven wear of the outer blade.

Next, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, 11 is a main body case made of synthetic resin or the like, 12 is an outer cutter holder fitted to the upper end of the main body case 11, and this outer cutter holder 12 has an outer cutter 13 stretched thereon. 14 is the main body case 1 mentioned above.
1, and this motor 14
An eccentric shaft 16 is fixed to the rotor shaft 15 of the rotor. Reference numeral 17 denotes a vibrator that is driven by the eccentric shaft 16 via a lever 18. A drive rod 17a is protruded from the upper surface of the vibrator 17.
An inner blade holder 19 is connected to the tip of 7a.
Reference numeral 20 denotes an inner cutter body formed by supporting a large number of inner cutter blades 21 in a skewered manner with a pipe 22 or the like. It is pressed against the inner surface of the outer cutter 13 under the force of a spring, and is reciprocated in the directions of arrows a and b by the rotation of the rotor shaft 15 of the motor 14.

As shown in FIG. 2, the outer cutter 13 is formed from a flexible metal plate by etching or press working, or is molded into a rectangular shape by electroforming. Raising ribs 24, 24 are formed at both ends in a direction perpendicular to the axial direction, in other words, in a direction perpendicular to the reciprocating direction (direction of arrow C), and run along the axial direction. . Thickness t ₁ of the above protruding rib 24 portion
(Fig. 3) is formed to be larger than the wall thickness t ₀ of other parts. This can be easily formed by forming the outer cutter 13 by electroforming.

Reference numeral 25 denotes a large number of slits that cross each of the protruding ribs 24, and the angle at which they intersect with the protruding ribs 25 may be arbitrarily selected. 26 is a small hole formed in almost the entire area of the outer cutter 13 except for each of the protruding ribs 24;
2 is a reinforcing plate for the outer cutter 13, and 28 is a locking portion for attaching the outer cutter. As shown in FIG. 4, the outer cutter 13 is curved in a direction perpendicular to the axial direction and stretched in an arch shape on the outer cutter holder 12.

In the above configuration, when the outer blade 13 is pressed against the skin and sheared, the long hair lying down is raised near the protruding rib 24, and in this state, the slit 25
is captured and sheared.

Here, even if the protruding ribs 24, 24 are formed on the outer cutter 13, the thickness t ₁ of the protruding ribs 24, 24 is made larger than the wall thickness t ₀ of other parts. Therefore, the outer cutter 13 in the state shown in FIG. 5 is attached to the outer cutter holder 12.
The portion of the protruding ribs 24, 24 on the outer cutter 13 is made rigid against the bending force F when the outer cutter 13 is stretched as shown in FIG.
absorption is suppressed. In other words, the bending force F is applied to the two protruding ribs 24, 2 on the outer cutter 13.
4 (center portion) 13a, and therefore each portion of the outer cutter 13 is curved with the same curvature, resulting in good adhesion to the cutting edge of the inner cutter body 20. Therefore, the hair is effectively captured without being bitten, and the risk of uneven wear and cracking can be eliminated due to uniform contact with the cutting edge of the inner cutter body 20.

Incidentally, the larger the width of the slit 25 that crosses the protruding rib 24, the more the gripping property is increased, but on the contrary, the strength of the protruding rib 24 is forced to decrease. However, if the protruding rib 24 is made thicker than the other parts as described above, it becomes easier to adjust the width of the slit 25 without sacrificing strength. Since this slit 25 extends in a direction crossing the protruding rib 24, even if the slit width becomes somewhat large, the outer cutter 1
3 does not weaken the rigidity of the protruding rib 24.

Note that the outer cutter 13 is not limited to a reciprocating type, but can also be applied to a so-called rotary type in which a roll-shaped inner cutter having a spiral blade formed on the outer periphery is rotated.

As described above, the present invention makes the thickness of the protruding rib formed on the outer cutter larger than the thickness of other parts,
By providing rigidity against bending force, the entire area of the stretched outer blade properly follows the cutting edge of the inner blade, improving cutting quality and minimizing wear and tear on the blade. We can provide you with the electric shaver you want.

[Brief explanation of the drawing]

FIG. 1 is a cutaway front view showing an example of an electric shaver according to the present invention, FIG. 2 is a perspective view showing an outer cutter of the electric shaver, FIG. 3 is a cross-sectional view of the outer cutter, and FIG.
The figure is a schematic view of the head with the outer cutter stretched, Figure 5 is the state before the outer cutter is stretched, Figure 6 is an explanatory diagram of the action of the outer cutter in the stretched state, and Figures 7 to 9 The figure is an explanatory diagram of a conventional example. 13... Outer blade, 20... Inner blade body, 24, 24...
...projection rib, 25...slit, t ₀ , t ₁ ... wall thickness.

Claims (1)

[Claims] 1. In an electric shaver in which a flexible rectangular outer cutter 13 is stretched in an arch shape and an inner cutter body 20 is slid on the inner surface thereof, there are a number of Raising protruding ribs 24, 24 having slits 25 are formed on the outer cutter 13 along the axial direction, and the protruding ribs 24, 2
An electric razor in which the wall thickness t ₁ of No. 4 is set larger than the wall thickness t ₀ of other parts.