JPS6037746B2 - electric razor outer blade - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of an outer blade of an electric razor.

Conventionally, in order to manufacture the outer blade of an electric razor, the first step is
As shown in the figure, a thin metal plate is placed on top of a die slot with a plurality of protrusions A, and is pressed and molded with a mold to form a plurality of protrusions C, and then the recesses other than the protrusions C are formed. 2 was removed by cutting to form a plurality of hair introduction holes. However, in the outer blade of a conventional electric razor manufactured in this way, the metal material at the shoulder part of the protrusion A of the dice is pulled to both sides and becomes the thinnest part, and that part breaks. However, there are constraints on the depth of the die opening and when forming the shoulder of the die opening into an arc shape, and the corners of the sink land portion obtained by cutting the lower part of the metal material Therefore, the rising angle (that is, the cutting edge angle a) must become small, and therefore the diameter of the sink land surface cannot be made small. Therefore, if a metal material with a large elongation at break is used in order to reduce such breakage, the surface of the product becomes rough and the hardness of the cutting edge decreases. The present invention was made in order to improve the conventional shortcomings, and the hardness of the cutting edge is made higher than that of the conventional one to maintain the sharpness for a long time.
Moreover, it is intended to eliminate the inconvenience of rough skin etc. occurring on the surface of the product.

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 3 is a sectional view showing the press-molded state of the outer blade of the electric razor of the present invention, FIG. 4 is a partially cutaway sectional view of the outer blade with the lower half cut, and FIG. 5 is another embodiment of the present invention. FIG. 3 is a partially cutaway sectional view showing the structure of an example outer cutter. In the figure, 1 is a clad material with a high carbon content layer la on the front side and a low carbon content layer lb on the back side, and 2 is a die with a plurality of protrusions 2a formed on the upper side. The shoulder portion of the protrusion 2a is slightly rounded and has an arc shape.

3 is a pressing die that presses the clad material 1 from above.

Next, a method for manufacturing the outer blade of the electric razor of the present invention will be explained.

The above-described cladding material 1 is press-molded with the surface of the low carbon material lb facing the upper surface of the die 2 and the surface of the high carbon material la facing the surface of the press mold 3. At this time, only the portion of the cladding material 1 corresponding to the protrusion 2a of the die 2 protrudes upward, and a plurality of protrusions 2a are formed. Here, dice 2
The thickness of the cladding material 1 is the thinnest at the shoulder portion 2b since it is stretched to both sides, and the other portions are smoothly thickened. That is, the deformed state of the wall thickness after press molding is shown in FIG. 3. Next, the lower half other than the protrusion lc is removed by cutting.

As a result, the periphery of the whisker introduction hole is smoothly bent toward the back side, and the bonding surface between the high carbon content layer and the low carbon layer faces the back side. FIG. 4 is a cross-sectional view of the state after cutting, and the cutting edge angle can be left at a large angle (for example, greater than 60 degrees). Here, since the layer forming the sink land recess has a high carbon content layer la on the upper surface side and a low carbon content layer lb on the lower surface side, the upper surface side is a hard layer and the lower surface side is a hard layer.

As described above, the outer blade of the electric razor of the present invention is not limited to being formed of a clad material in which a high carbon content layer and a low carbon content layer are bonded into two layers.

As shown in FIG. 5, it may be formed using a clad material in which high carbon content layers and low carbon content layers are alternately bonded into four layers.

As described above, the outer blade of the electric razor of the present invention has a high carbon content layer on the front side and a low carbon content layer on the back side, and a plurality of hair introduction holes are formed in the clad material bonded and bonded. The periphery of the blade is bent toward the back side so that the joining surface of the high carbon content layer and the low carbon content layer faces the back side, so the cutting edge on the inner peripheral side of the hair introduction hole is a hard high carbon content layer. It is covered and the sharpness lasts for a long time.

In addition, the low carbon content layer on the back side of the cladding material located in the sink part is relatively soft, so the flesh of the cladding material that is in contact with the shoulder of the protruding part of the die is easily constricted and deformed. rate can be increased. By using the cladding material, it is possible to provide an outer cutter with high mechanical strength and flexibility as a whole.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the outer blade of a conventional electric razor in a state of divine pressure molding, Figure 2 is a partially cutaway cross-sectional view of the outer blade with the lower half of the outer blade machined, and Figure 3 is a sectional view of the outer blade of a conventional electric razor. FIG. 4 is a partially cutaway sectional view of the outer blade of the invention electric razor in which the outer blade has been formed by cutting, and FIG. FIG. 3 is a partially cutaway sectional view showing the structure. 1...Clad material, la...High carbon content layer, l
b...Low carbon content layer, lc...Protrusion, 2
...Dice, 2a...Protrusion, 3...
...Press type. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 A plurality of whisker introduction holes are formed in the bonded clad material with a high carbon content layer on the front side and a low carbon content layer on the back side, and the periphery of the whisker introduction holes is bent to the back side to form the high carbon content layer. An outer blade of an electric razor characterized in that the joint surface with the low carbon content layer faces the back side.