JPS6329687A - Blade of electric razor - Google Patents

Abstract

(57) [Abstract] 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 an electric shaver blade, and more particularly to an electric shaver blade with an improved structure of a fixed blade and a movable blade that slide back and forth.

(Background Art) Conventionally, in electric shaver blades such as trimmers in which a substantially comb-shaped fixed blade and a movable blade slide back and forth, the fixed blade and the movable blade are generally formed in a plane and overlapped, and The leading edges of these blades are formed in a straight line or in a convex shape projecting forward from both ends of the blade width to the center.

Such electric razor blades can effectively shave hair when the part of the body that comes into contact with the blade is generally flat or concave, such as when shaving unwanted hair under the armpits.
As shown in Figure O, when the body parts 52 are convex, such as arms and legs, a gap is created between the body parts 52 and the blade 51, resulting in a problem that the shaving process is inefficient and takes a long time. At the same time, if the blade 51 is strongly pressed against the body part 52 in order to increase efficiency, there is a risk that the blade 51 will dig into the skin and cause injury.

In order to solve such problems, for example,
480 and Utility Model Application No. 53-20.672 have already been proposed. Among these, JP-A No. 56-97480 is for hair styling of eyebrows, and the tip edge of the blade is formed in a convex or concave shape to match the shape of eyebrows, and JP-A-53-20672 is for hair cutting. The blade is formed in a concave shape to match the shape of the head. However, since all of these blades have flat blades, even if they are used to remove unwanted hair on arms and legs, the length of contact with the skin will vary depending on the angle at which the blade is applied to the body part. It has been impossible to efficiently and completely remove unwanted hair.

(Object of the Invention) The present invention has been proposed in view of the above points, and its object is to make the fixed blade and the movable blade curved and overlapped, rather than planar, and to make the tip edges of these blades convex. Another object of the present invention is to provide an electric razor blade which is formed in a concave shape so that the blade can be brought into close contact with the skin regardless of the angle of application, thereby enabling efficient removal of unwanted hair in a short time.

(Disclosure of the Invention) The present invention will be described below with reference to the drawings. First, FIGS. 1 to 6 show a first embodiment of the present invention, and FIG. 1 shows the appearance of an electric shaver to which the present invention is applied. In addition to the blade 5 according to the present invention, this electric shaver is equipped with a main blade 4 consisting of a net-shaped outer blade and an inner blade that slides back and forth on the inner surface of the net-shaped outer blade. However, the present invention can of course also be applied to an electric shaver equipped only with so-called trimmer-shaped blades.

In FIG. 1, reference numeral 1 denotes a razor body, and a blade unit 2 is attached to the upper end of the razor body via an opening/closing button 3 so as to be openable and closable. In addition to the above-mentioned main blade 4, the blade unit 2 is provided with a trimmer-shaped blade 5 according to the present invention. In addition, 6 in the figure indicates a drive switch, and as shown in FIG. By attaching a blade cover 10 onto the movable blade 9, a blade block 11 is integrally formed.

Next, FIG. 3 shows an exploded view of the blade block 11. First, reference numeral 12 is a joint for converting rotational motion from a motor (not shown) into reciprocating motion. A notch 13 is formed in which the connected eccentric cam engages, a fulcrum bearing 14 is formed in the center, and a drive head 15 is formed in the upper end to engage with and drive the movable blade 9. is formed.

Next, the blade base 7 includes a base plate 16, and a fulcrum shaft 17 that is loosely engaged with the fulcrum bearing 14 is protruded from the center of the base plate 16. A nine mounting portion 18 is attached to the upper end of the substrate 16, and a locking groove 19 is formed at both ends thereof, and the blade mounting surface 20 on the upper surface is curved into a concave shape with a radius of curvature R3. There is. Further, a square hole 21 is formed in the center of the 9-mounting portion 18, and two mounting holes 22 are formed on both sides of the square hole 21.

On the other hand, the fixed blade 8 placed on the blade mounting surface 20 has a window hole 23 in its center, and two mounting holes 24 on both sides of the window hole 23.
is drilled. The radius of curvature of the sliding surface 25 with the movable blade 9 is set to R2. Further, an engaging part 26 that engages with the drive head 15 through a window hole 23 and a square hole 21 is vertically provided on the lower surface of the movable blade 9, and two mounting holes 27 are bored on both sides of the engaging part 26. There is. In addition, the sliding surface 2 with the fixed blade 8
The radius of curvature of No. 8 is set to R□. Here, the relationship between the curvature radii R1 to R1 described above is set to R≧R2≧R1. In addition, in FIG. 3, 29 indicates a push-up spring.

Next, the blade cover 10 includes a top plate 30, a locking arm 31 vertically installed at both ends of the bottom surface of the top plate 30, a mounting boss 32 vertically installed inside the locking arm 31, and a notch 3 of the push-up spring 29.
The movable blade 9 and the fixed blade 8 are superimposed between the blade mounting part 8 so that the mounting boss 32 passes through the mounting holes 27, 24, and 22. By locking the locking arm 31 in the locking groove 19, the blade block 11 is integrally formed.

However, in this embodiment, the blade tip edges 35, 34 of the movable blade 9 and the fixed blade 8 are formed in a concave shape toward the front, as shown in FIG. 4(A), and as shown in FIG. Another feature is that the sliding surfaces 28, 25 of the movable blade 9 and the fixed blade 8 are formed in a concave shape so as to curve downward at the center thereof.

Here, when the sliding surface 28.25 is curved into a concave shape,
It is conceivable to form and grind the fixed blade 8 along the direction of arrow A in FIG. 3. In this case, if the radii of curvature R + Rz of the sliding surfaces 28 and 25 do not match, the sliding surfaces 28.
Therefore, in order to completely contact the sliding surfaces 28 and 25 while setting the grinding accuracy relatively roughly, the radius of curvature should be set to R > R as described above.
By setting 2≧R3 and pressing one or more places near the center of the movable blade 9 in the direction of the fixed blade 8 with the push-up spring 29, the sliding surfaces 28, 25 can be brought into complete contact with each other. can.

To use this, as shown in Fig. 5, the blade 5 can be applied to body parts 52 such as arms and legs and driven. The blade 5, which is formed in a concave shape in the vertical and front-back directions, always comes into close contact with the skin over a wide range as shown in FIG. 6, regardless of the application angle, and can efficiently remove unwanted hair.

Next, FIGS. 7 and 9 show a second embodiment of the present invention. In this embodiment, as shown in FIGS. 7 to 9, the blade tip edges 35' and 34' of the movable blade 9' and the fixed blade 8' forming the blade 5' are formed in a convex shape toward the front. Also, like the first embodiment, the sliding surfaces 28' and 25' of the movable blade 9' and the fixed blade 8' are formed in a concave shape so as to curve downward at the center thereof.

According to this embodiment, when removing unwanted hair from a body part with a concave surface such as the armpit, the blade tip edge 3
5' and 34' have the advantage of being in close contact with the skin and efficiently cutting unwanted hair.

(Effect of the invention) ゛.

As described above, according to the present invention, in an electric shaver blade in which a substantially comb-shaped fixed blade and a movable blade slide back and forth, the sliding surfaces of the fixed blade and the movable blade are curved and overlapped, and the fixed blade and the movable blade are curved and overlapped. The edge of the blade and the movable blade are formed in a concave or convex shape facing forward, so the blade can be brought into close contact with the skin regardless of the unevenness of the skin or the angle of contact with the skin, which can be done quickly and efficiently. It has the effect of removing unwanted hair.

[Brief explanation of drawings]

1 to 6 show a first embodiment of the present invention, in which FIG. 1 is a perspective view of an electric shaver to which the present invention is applied, FIG. 2 is a perspective view of a blade unit and a blade block, and FIG. The figure is an exploded perspective view of the blade block, an explanatory diagram of its operation, Figure 4 (A) is a plan view of the blade, Figure (B) is also a front view, Figures 5 and 6 are explanatory diagrams showing the state of use, Figures 7 to 9 show a second embodiment of the present invention, where Figure 7 is a perspective view of the blade block, Figure 8 is a perspective view of the blade, and Figure 9 (A) is a plan view of the blade. , FIG. 10 is a front view, and FIG. 10 is an explanatory view of the conventional example in use. 5.5'...Blade 8,8'...Fixed blade 9.9'...Movable blade 25.25'28.28
'...Sliding surface 34.34'35.35'...Blade tip edge Fig. 1

Claims (2)

[Claims] (1) In an electric razor blade in which a substantially comb-shaped fixed blade and a movable blade slide back and forth, the sliding surfaces of the fixed blade and the movable blade are curved and overlapped, and the blades of the fixed blade and the movable blade are curved and overlapped. An electric razor blade characterized by having a tip edge facing forward in a concave or convex shape. (2) The relationship between the radius of curvature R_3 of the blade mounting surface of the blade base on which the fixed blade is mounted, the radius of curvature R_2 of the sliding surface of the fixed blade, and the radius of curvature R_1 of the sliding surface of the movable blade. , R_1≧R_2
The electric shaver blade according to claim 1, wherein the electric razor blade is set to ≧R_3.