JPS6319195B2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention relates to an inner blade for a reciprocating electric razor.

(Background Art) Figure 1 A, B, and C show a general reciprocating electric razor. This reciprocating electric razor has a built-in drive motor and a switch 1 on the outside. a razor body 3 having a drive element 2 connected to a drive shaft of a motor projecting from the center of the upper part; an inner blade 5 attached via a joint 4 above the razor body 3; An outer cutter frame 7 has an outer cutter 6 which is removably attached above the razor body 3 so as to cover the outer cutter 5, and an inner cutter blade 8 is configured to come into sliding contact with the inner surface of the outer cutter 6.

Figure 2 is a perspective view of the inner cutter 5, Figure 3 is A in Figure 2.
- A cross-sectional view is shown, and this inner cutter 5 includes inner cutter blade support members 9a to 9c arranged at positions corresponding to respective apexes of a substantially triangular shape, and these inner cutter blade support members 9a. It is composed of a large number of half-ring-shaped inner cutter blades 8 whose both ends and inner central part are supported by .about.9c.

The bending elastic modulus of the conventional inner blade 8 configured as described above is explained with reference to FIG.
The rigidity is large at both end support portions near θ=90°, and small in the intermediate region near θ=45°. Figure 4 shows the relationship.

By the way, it is commonly said that sharpness is good or bad, but good sharpness means that the cut surface of the beard is sharply cut as shown in Figure 5 A, and the cut surface is not wrinkled as shown in Figure 5. The relationship between this cutting quality and the above-mentioned elasticity is proportional, and the greater the elasticity, the better the cutting quality. Fig. 4 shows the relationship between elastic modulus and sharpness, where curve a shown by a solid line is the conventional elastic modulus, curve b shown by a dashed dotted line is a conventional sharpness curve, and curve c shown by a two-dot chain line is a curve according to the present invention which will be described later. The cutting curve is shown below. The inner blade 8, which constitutes the inner blade of a conventional reciprocating electric razor, has regions with different moduli of elasticity, so there are regions where the cutting quality is poor, and the rigidity of the center part, which contributes most to cutting, is particularly large. There was a problem that the sharpness deteriorated significantly.

(Object of the Invention) The present invention has been proposed in view of the above points, and its purpose is to make the inner blade of a reciprocating electric razor uniform in rigidity. To provide an inner blade of a reciprocating electric razor capable of obtaining uniform cutting over the entire cutting area.

(Disclosure of the Invention) In order to achieve the above object, the present invention provides an inner blade of a reciprocating electric razor in which both ends and the center of an arc-shaped inner blade are supported, in which the center support part and each end support part are supported. The gist of this invention is an inner blade of a reciprocating electric razor, characterized in that a bulge is provided on the inner side of each inner blade between the inner blades, the width of which becomes wider toward the center.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 6 shows a first embodiment of the present invention. In this embodiment, the central part of the inner blade 8 is supported by the central support part 9a and both end support parts 9b and 9c. A substantially trapezoidal bulge 10 is provided in the inner part of the inner blade 8 between the end and the inner blade 8, and as shown in FIG. It is characterized by improved rigidity and uniform cutting quality over the entire cutting area of the inner blade.

FIG. 7 shows a second embodiment of the present invention. This differs from the previous embodiment in that the blade width is changed in an arc shape, and the width of the blade is the thickest at the center.

(Effects of the Invention) As described above, the present invention makes the inner blade constituting the inner blade of a reciprocating electric razor uniform in its rigidity, so that the stiffness is uniform over the entire cutting area of the inner blade. It has the effect of providing sharpness and improving usability.

[Brief explanation of the drawing]

Figure 1 A, B and C show a conventional reciprocating electric razor, A is an overall perspective view, B is an exploded perspective view, C is a partial sectional view, and Figure 2 is a perspective view of a conventional inner blade Figure 3 is a sectional view taken along the line A-A in Figure 2, Figure 4 is an explanatory diagram showing the relationship between the elastic modulus and change of the inner blade, and cutting quality, and Figure 5 A and B are explanatory diagrams showing the state of cutting quality. FIG. 6 shows an inner cutter blade supported by an inner cutter support blade in a first embodiment of the present invention. Moreover, FIG. 7 shows a second embodiment same as the above. 5... Inner blade, 8... Inner cutter blade, 9a... Center support part, 9b, 9c... End support part, 10...
Bulge.

Claims (1)

[Claims] 1. In the inner blade of a reciprocating electric razor in which both ends and the center of the arc-shaped inner blade are supported, widths are set on the inside of the inner blade between the center support part and each end support part toward the center. An inner blade of a reciprocating electric razor characterized by having a widening bulge.