JPS6272388A - Rotary blade of electric razor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a rotary blade for an electric shaver.

[Background technology]

The rotary blade of a conventional electric shaver is as shown in Figure 7.
Since the pressing spring (A) and the inner blade (B) are formed separately, when the inner blade (C) rotates and centrifugal force F acts on the center of gravity G of the inner blade (B), It is easy to be affected by centrifugal force, and with the push spring (a) as the fulcrum, Fr,
The rotational moment acts on the inner blade (b), causing the center of rotation of the inner blade (b) to lift up, resulting in poor adhesion to the first blade (d) and reduced sharpness.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a rotary blade for an electric shaver with good sharpness.

[Disclosure of the invention]

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4. The outer cutter l is made of a thin metal plate, and has a plurality of cutter holes 2 formed therein.

The edge of the outer cutter 1 is fixed to a cylindrical outer cutter base 3.

The inner cutter 4 has a pair of inner cutter blades 5 that slide on the inner surface of the outer cutter l.
It is composed of a pair of push-up springs 6 that press the inner cutter blade 5 against the outer cutter 1, and an inner cutter base 8 that supports the support part 7 of the push-up spring 6. The push-up spring 6 is bent at a bending line 9 inclined with respect to the circumferential direction of a certain inner cutter 4, so that the outer length 11) of the push-up spring 6 in the radial direction of the inner cutter 4 is made shorter than the inner length 12). With,
An inner blade 5 is integrally formed at the free end of the push-up spring 6. The push-12 spring 6 is accommodated in the opening 10 of the inner cutter base 8. The inner cutter 4 is connected to a rotating shaft 13 of a motor 12 via a joint 11.

The outer length I of the push-up spring 6 in the radial direction of the inner cutter 4
When I) is made shorter than the inner length 12), the outer spring force P1 and the inner spring force P2 of the push-up spring 6 are P,>P
, and b(P+P2
) A counterclockwise rotational moment is generated. Inner blade 4
When rotates, a centrifugal force F acts on the center of gravity G of the inner blade 5, and a force F is applied to the inner blade 5 using the push-up spring 6 as a fulcrum.
The clockwise rotational moment L acts on the inner blade 5, and the rotational moment acting on the inner blade 5 is FL.
The clockwise rotational moment becomes b (P+Pg).

If the shape of the inner blade is such that FL-b (P+ -Pg)=O, the rotational moment acting on the inner blade 5 is eliminated, and the sharpness is improved by -.

Next, a second embodiment of the present invention will be described with reference to FIG. The inner cutter 14 of this embodiment includes a pair of inner cutter blades 15 that slide on the inner surface of the outer cutter l, a pair of pressure springs 16 that press the inner cutter blade 15 against the outer cutter 1, and a pair of pressure springs 16 that press the inner cutter blade 15 against the outer cutter 1, and It consists of an inner cutter base 18 that supports the support part 17 of the push-up spring 16, and is inclined with respect to the rotation center direction of the inner cutter 14, which is the direction in which the push-up spring 16 extends. The push-up spring 16 is bent at the bending line 19 to make the outer length l,) of the push-L spring 16 in the radial direction of the inner cutter 14 shorter than the inner length 14), and the push-up spring 16
An inner blade 15 is integrally formed at the free end of the blade.

Next, a third embodiment of the present invention will be described with reference to FIG. The inner cutter 20 of this embodiment includes a pair of inner cutter blades 21 that slide on the inner surface of the outer cutter l, a pair of push-up springs 22 that press the inner cutter blades 21 against the outer cutter 1, and a pair of push-up springs 22 that press the inner cutter blades 21 against the outer cutter 1. The push-up spring 22 is configured with an inner cutter base 24 that supports the support portion 23 of the push-up spring 22, and the push-up spring is 22 and make the outer length 15) of the push-up spring 22 in the radial direction of the inner cutter 20 the inner length 16.
), and the inner blade 21 is integrally formed at the free end of the push-up spring 22.

In the embodiment, the push-up spring is extended forward in the rotation direction of the inner cutter, but the push-up spring may be extended backward in the rotation direction.

〔Effect of the invention〕

As described above, the rotary blade of the electric shaver according to the present invention includes an outer cutter in which a plurality of cut holes are formed, an inner cutter blade that comes into sliding contact with the inner surface of the outer cutter, and the inner cutter blade that is in sliding contact with the inner surface of the outer cutter. In a rotary blade of an electric shaver, which is equipped with an inner cutter consisting of a push-up spring that presses and an inner cutter base that supports the push-up spring, the push-up blade is pressed with a folded line inclined with respect to the direction in which the spring extends. The L spring is bent to make the outer length of the push-up spring in the radial direction of the inner blade shorter than the inner length, and the inner cutter blade is integrally formed at the free end of the push-up spring. Because of this, the inner blade is not affected by centrifugal force, and even when the inner blade rotates, the center of rotation of the inner blade does not lift up, resulting in good contact with the outer blade and good sharpness. effective.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an electric shaver equipped with a rotary blade of the electric shaver of the present invention, Fig. 2 is a plan view of the inner cutter of the electric shaver of the above, and Fig. 3 is a view of the inner cutter blade and push-up spring of the same. FIG. 4 is a plan view of the arrow A in FIG. 2 for explaining the rotational moment, and FIG.
FIG. 6 is a plan view corresponding to FIG. 2 in the third embodiment of the present invention, and FIG. 7 is a sectional view corresponding to FIG. 1 in the conventional example. l...Outer blade, 2...Blade hole, 4.14.20...Inner blade, 5
．． 15.21...Inner cutter blade, 6.16.22...Push-up spring, 8.18.24...Inner cutter base, 9.19.25
...Folding curve.

Claims (1)

[Claims] 1) An outer cutter having a plurality of cutting holes formed therein, an inner cutter blade that slides on the inner surface of the outer cutter, a push-up spring that presses the inner cutter blade against the inner surface of the outer cutter, and an inner cutter that supports the push-up spring. In the rotary blade of an electric shaver, which is equipped with a base and an inner cutter, the push-up spring is bent along a bending line that is inclined with respect to the extension direction of the push-up spring, and the outer length of the push-up spring in the radial direction of the inner cutter is adjusted. In addition to making the length shorter than the inner length,
A rotary blade for an electric shaver, characterized in that an inner blade is integrally formed at the free end of a push-up spring.