JPS6238610Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of a rotary electric shaver in which an inner blade attached to the circumferential surface of a rotating barrel is brought into elastic contact with an inner surface of an outer cutter.

[Conventional technology]

Conventionally, in rotary electric shavers, in order to improve cutting efficiency, the inner blades are pressed upward against the outer blades using separate spring members on the circumferential surface of a rotary drum, and the inner blades are pressed up against the outer blades. It has been proposed that the inner blade is brought into elastic contact with the outer blade by pushing the entire blade up against the outer blade using a separate spring member. However, all of these have drawbacks such as complex structures, difficulty in assembly, and easy failure.

As a solution to this drawback, there is, for example, one disclosed in Japanese Utility Model Application Laid-Open No. 53-106191. As shown in FIG. 4, the inner blade 4 is held in an engagement groove 15 formed on the circumferential surface of the rotary cylinder 5 so as to be displaced in the radial direction of the cylinder by its own elasticity. . However, in the case where the inner cutter blade 4 is flexibly deformed within the engagement groove 15 in this way, the direction of elastic deformation of the inner cutter blade 4 is restricted, so that the impact when sliding contact starts against the inner surface of the outer cutter 2 is large.
That is, when the inner blade 4 rotates, the inner blade 4 receives a force inward in the radial direction of the body and a force in the opposite direction to the rotational direction at the starting point of sliding contact with the inner surface of the outer cutter 2. Because the inner cutter blade 4 hits the wall 15a on the lower side in the rotational direction in the engagement groove 15 due to the force in the opposite direction to the rotational direction, the inner cutter blade 4 resists the force in that direction, so that the impact applied to the outer cutter 2 is large. That is, the inner blade 4 is inserted into the wall 15 in the engagement groove 15.
Since the direction of the reaction force when it hits point a does not match the direction of movement in the radial direction of the barrel, the inner cutter blade 4 is twisted into the engagement groove 15, giving an impact to the outer cutter 2, causing vibration. , it is difficult to obtain smooth rotation, and it may also cause damage to the outer cutter 2 or the inner cutter blade 4.

As a method to solve this problem, the engagement groove 15
However, in such a case, a gap will be created between the inner blade 4 and the engagement groove 15, and hair will enter through this gap and accumulate in the engagement groove 15. It becomes easier. The hair waste accumulated in the engagement groove 15 is difficult to discharge and dispose of, and it also makes it difficult for the inner blade 4 to move, which is a disadvantageous problem.

[Problem that the invention attempts to solve]

This idea solves the above-mentioned conventional problems, and allows for a simpler structure and easier assembly.
The purpose of the present invention is to provide a rotary electric shaver with fewer failures.

This invention also provides a rotary electric shaver that can reduce the impact of the inner blades on the outer blades, rotate smoothly with less vibration, and improve the durability of the outer and inner blades. With the goal.

A further object of this invention is to provide a rotary electric shaver that can enhance the effect of removing hair from the inner blade.

[Means for solving problems]

In order to achieve the above objectives, this invention:
The fixing plate portion 4 is formed by forming the inner cutter blade 4 into a Z-shaped cross section.
a, an abdominal plate part 4b extending from the fixed plate part 4a, and a cutting edge plate part 4c bent at the end of the abdominal plate part 4b in the direction of extension. The inner blade 4 is fixed to the fixed plate portion 4.
a is embedded and fixed in a part of the circumferential surface of the rotating drum 5, and a connecting portion between the fixed plate part 4a and the belly plate part 4b, the belly plate part 4b and the cutting edge plate part 4c are arranged outside the circumferential surface of the rotating drum 5. The abdominal plate portion 4b is elastically deformed in the radial direction of the rotating body 5 using the connecting portion as a fulcrum outside the circumferential surface of the rotary body 5.

[Effect]

In this case, the inner blade 4 brings the cutting edge plate 4c into elastic contact with the inner surface of the outer cutter 2 through elastic deformation of the belly plate 4b.

Further, when the inner blade 4 rotates, at the point where the cutting edge plate 4c starts sliding contact with the inner surface of the outer cutter 2, the inner blade 4 receives a force inward in the radial direction of the body and a force in the opposite direction to the rotation direction. However, at this time, the belly plate portion 4b moves inward in the radial direction of the body while elastically deforming without resisting the force in the opposite direction to the rotational direction. Smooth sliding contact is made along the outer blade 2, and no impact is applied to the outer cutter 2.

〔Example〕

An embodiment of a rotary electric shaver according to the present invention will be described with reference to FIGS. 1 to 3.

In FIG. 1, a semicircular mesh outer cutter 2 is removably attached to the hair storage chamber 1a in the upper part of the main body case 1 via an outer cutter holder 3. A rotary cylinder 5 equipped with an inner blade 4 that comes into elastic contact with the inner surface is rotatably mounted around a shaft 6. The rotating body 5 has a gear 7 fixed to one end of the shaft 6, and a motor 8 built in the main body case 1.
The drive gear 10 on the shaft 9 is transmitted to the gear 7 via a group of reduction gears 11, thereby rotating in the direction of arrow A.

As shown in FIG. 2, a plurality of inner blades 4 are mounted on the circumferential surface of the rotary drum 5 in parallel to the axial direction. Each inner cutter blade 4 includes a fixed plate part 4a formed with a Z-shaped cross section and embedded and fixed in a part of the circumferential surface of the rotary cylinder 5, and an end of the fixed plate part 4a protruding outward in the radial direction of the rotary cylinder 5. It consists of a belly plate part 4b extending in a direction opposite to the rotational direction A, and a cutting edge plate part 4c bent outward in the body radial direction from the end in the extension direction of the belly plate part 4a. The belly plate part 4b is arranged on the rotating body 5 so that it can be elastically deformed in the body radial direction using the connecting part with the fixed plate part 4a as a fulcrum outside the circumferential surface of the rotating body 5.
A gap is formed between the circumferential surface of the In addition, the abdominal plate part 4
Through-holes 12 are formed at several locations in b to facilitate elastic deformation and to reduce weight. The through-hole portion 12 is not limited to the rectangular hole shown in FIG. It is also possible to make only the portion 4b thinner.

[Effect of idea]

According to the present invention, the inner cutter blade 4 comes into contact with the inner surface of the outer cutter 2 due to elastic deformation in the barrel radial direction by its own belly plate 4b, so the outer cutter blade 4 can be used without a separate spring member. Inner blade 4 for blade 2
The blade edge plate portion 4c is brought into elastic contact with the structure,
Assembly can be simplified and failures can be reduced.

In particular, in the present invention, the inner cutter blade 4 is
The fixed plate part 4a is embedded and fixed in a part of the circumferential surface of the rotary cylinder 5 so that the connecting part between the a and the abdominal plate part 4b, the abdominal plate part 4b and the cutting edge plate part 4c are arranged outside the circumferential surface of the rotary cylinder 5. , the abdominal plate portion 4b can be freely elastically deformed outside the circumferential surface of the rotating body 5 using the connecting portion as a fulcrum. Therefore, there is no impact at the starting point of sliding contact with the outer cutter unlike in the conventional inner cutter blade mentioned above, and smooth rotation with less vibration is achieved, which also improves the durability of the outer cutter 2 and the inner cutter blade 4. This is excellent, and also eliminates the problem of hair entering the rotating body as with conventional inner-cutting blades.

In addition, in this way, the inner blade 4 is
Even if the portion from the connecting portion with the fixed plate portion 4a to the cutting edge plate portion 4c is arranged outside the circumferential surface of the rotary barrel 5, the inner blade 4 separates from the inner surface of the outer blade 2 when the inner blade 4 rotates. Immediately, due to the elastic restoring force, the blade returns to the outside in the radial direction of the barrel (see Fig. 3), and the vibration accompanying this return deformation forces the hair particles adhering to the blade edge plate 4c to be brushed off. The inner cutter blade 4 comes into elastic contact with the outer cutter 2 again in a clean state without any hair particles attached thereto, which has the advantage of improving sharpness.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the rotary electric shaver according to the present invention, with Figure 1 being a partial longitudinal cross-sectional view and Figure 2 being a perspective view of a rotary body equipped with inner blades. , FIG. 3 is a diagram showing the operation of the inner cutter blade in an elastic restoring state when it is separated from the outer cutter. FIG. 4 is a sectional view showing a part of a conventional rotary electric shaver. 2... Outer blade, 4... Inner cutter blade, 4a... Fixed plate part, 4b... Abdomen plate part, 4c... Cutting edge plate part, 5
...Rotating body, 6...axes.

Claims (1)

[Scope of utility model registration request] A plurality of inner blades 4 parallel to the axial direction are mounted on the circumferential surface of a rotary drum 5 that is rotationally driven around a shaft 6, and the inner blades 4 are in elastic contact with the inner surface of the outer blade 2. In the razor, the inner cutter blade 4 is connected to a fixed plate portion 4a that is embedded in and fixed to a part of the circumferential surface of the rotating barrel 5, and from a protruding end of the fixed plate portion 4a that protrudes outward from the circumferential surface of the rotating barrel 5. Abdominal plate part 4b formed to extend in the counter-rotational direction of No. 5, and abdominal plate part 4b.
The cutting edge plate part 4c is bent outward in the cylinder radial direction from the end on the extension direction side, and has a Z-shaped cross section. A rotary electric shaver characterized in that the rotary electric shaver is configured to be elastically deformable in the radial direction of the body using a connecting portion with the body as a fulcrum.