JPS5894879A - 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 The present invention relates to a rotary blade for an electric razor that cuts beards by rotating and sliding an inner cutter into contact with a spherical outer cutter.

Conventionally, as shown in FIG. 4, an electric razor is rotated, which is held on an inner frame 5 via a spring 4 to push up one end of an inner cutter blade 30 that rotates and slides into contact with the inner surface of an outer cutter 1 having a hair introduction hole 2. The inner blade 30 of this rotary blade is made of a rigid body, and the tip of the inner blade 30 has a rake angle θ, so that the skin is brought into contact with the outer blade 1 and the beard B is formed. When the outer cutter 1 and the inner cutter blade 80 protrude from the whisker introduction hole 2 to the inner surface of the outer cutter 1 and attempt to cut, the cutting force of the inner cutter blade 30 acts in the direction F, and the inner cutter blade 3o
A component force of a reaction force F1 against the force pushing up the inner blade 3o and a force F2 that prevents rotation of the inner cutter blade 3o is generated. However, since the inner blade 30 has no force in the rotational direction FQ, it overcomes the component force F2 and rotates, but depending on the component force Fl, the inner blade 80 moves in the opposite direction to the outer cutter 1 and the inner blade 80 moves in the opposite direction to the outer cutter 1. There is a problem in that the adhesion with the blade 80 is low, and the hairs B are not cut sharply, resulting in poor cutting quality.

The purpose of the present invention is to solve the above-mentioned problems and to provide a comfortable shave by imparting sharpness to cutting beards and improving the cutting quality.

In FIG. 1, a spherical outer cutter 1 in which a plurality of sink introduction holes 2 are formed is provided on an outer cutter frame 6, and one end 9 of an inner cutter blade 3 is inserted into the outer cutter frame 6 via a push-up spring 4. An inner cutter frame 5 is housed therein. The inner blade frame 5
A motor shaft insertion hole 7 is formed in the center of the motor shaft, and the rotating shaft of the motor (not shown) is engaged with the motor shaft insertion hole 7, so that the inner cutter frame 5 is connected to the inner cutter blade 3 and the push-up. It rotates together with the spring 4. Inner cutter frame 5 of the blade 3
As shown in FIG. 2, one end 9 of the blade 3 is held by the other end of a push-up spring 4 whose one end is fixed to the inner cutter frame 5, and the inner cutter blade 3 is held by the inner cutter frame 5. It is configured to be fitted into the fitting hole 8 of. In addition, in FIG. 3, the other end 8 of the inner blade 3 is shaped in the same direction R.
The blade rotates while slidingly contacting the inner surface of the outer cutter 1 via the bent portion 12 bent in the same manner. The inner blade 3 has a notch 11 formed in the middle thereof approximately parallel to a bent portion 12 (see FIG. 1) of the inner blade 3, and the notch 11 is located at a position that protrudes beyond the inner blade frame 5. be.

Next, the operating state of the rotary blade of the present invention will be explained with reference to FIG. The skin A is brought into contact with the outer cutter 1 and the beard B is projected from the beard introduction hole 2 to the inner surface of the outer cutter 1, and the inner cutter blade 3 is rotated in the R direction so that the other end 8 of the inner cutter blade is attached to the beard B. At the time of collision, that is, the force F4 that cuts the beard by the inner blade 3 is the component force of the reaction force F when the force F5 pushing up the inner blade 3 and the rotational force y6 of the inner blade 3 are generated. The inner cutter blade 3 is cut by the inner cutter blade 8 by the above-mentioned notch part 11 in such a state that the direction of the force F4 for cutting the beard with respect to the rake angle θ of the inner cutter blade 3 is 1 with the cutting edge of the inner cutter blade 3. By tilting, most of the force with which the inner cutter blade 3 collides with the beard B can be converted into cutting force of the beard. At this time, the notch 11 is inserted into the bent part 12 of the inner blade 3.
If the inner cutter blade 3 is made approximately parallel to the inner cutter blade 3, the inner cutter blade 3 will be more likely to tilt more smoothly. Also, the rotation direction R of the insertion hole 8 of the inner cutter frame 5
If the inner cutter blade 3 is shaped to operate while remaining in contact with the inner cutter frame 5 on the opposite side, the contact between the inner cutter blade 3 and the inner cutter frame 5,
Can be set in a shape that does not generate noise without separation.

As described above, the present invention holds one end of the inner cutter blade, which rotates and slides in contact with the inner surface of the spherical outer cutter provided with a plurality of whisker introduction holes, on the inner cutter frame via a push-up spring, and Since the inner cutter blade is freely bendable between the inner cutter frame and the inner cutter frame, most of the force with which the inner cutter blade collides with the beard is converted into cutting force, so that the beard can be cut sharply.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view showing an embodiment of the present invention, Fig. 2 is a partial cross-sectional view showing the joint state of the inner cutter frame, push-up spring, and inner cutter blade, and Fig. 3 is a partial cross-sectional view showing the operating state of the present invention. FIG. 4 is a partially enlarged view showing the operating state of the conventional example. 10 outer blade, 3. inner blade, 4. push-up spring, 5.
O inner blade frame, 80 insertion hole, 11...notch, 12...
・Bending part. Patent applicant Matsushita Electric Works Co., Ltd. Patent attorney Toshimaru Takemoto (and 2 others) Figure 1 Strategy 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] (1) One end of the inner cutter blade, which is in rotating and sliding contact with the inner surface of the spherical outer cutter provided with a plurality of sink introduction holes, is held on the inner cutter frame via a push-up spring, and the outer cutter is A rotary blade for an electric razor, characterized in that an inner blade is bendable between an inner surface and the inner blade frame. 2. A fitting hole is formed in the inner cutter frame, an inner cutter blade is fitted into the hole and protrudes from the inner cutter frame, and a notch is formed in the inner cutter blade at a portion protruding from the inner cutter frame. The rotary blade of an electric razor according to claim 1, characterized in that: 3. The electric motor according to claim 2, wherein one end of the inner cutter blade forms a bent part bent in a C-shape in the rotation direction, and the cutout part is substantially parallel to the bent part. Rotating razor blade.