JPH04352988A - Inner blade for reciprocating electric razor - Google Patents

Abstract

PURPOSE:To simplify manufacturing method of an inner blade in a reciprocating electric razor provided with an outer blade having a curved surface along the sliding direction of the inner blade. CONSTITUTION:In a reciprocating electric razor provided with an outer blade 2 having a surface curved along the sliding direction of an inner blade 4, many small blades 7 are arranged parallelly in the first base 9 having flexibility, in the sliding direction of the inner blade with a predetermined space provided, and in the inner blade 4, the first base 9 is curved so that an edge point of the small blade 7 is placed along at an almost right angle relative to a curved internal surface of the outer blade 2, holding a curved condition of the first base 9 by the second base 11. In this way, the inner blade 4, whose edge point is placed along almost at a right angle relative to the curved internal surface of the outer blade 2, is easily obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating electric shaver, and more particularly to an inner cutter of a reciprocating electric shaver having an outer cutter having a curved surface along the reciprocating sliding direction of the inner cutter.

0002

[Prior Art] As a reciprocating electric shaver having an outer cutter of this kind of shape, for example, as disclosed in Japanese Utility Model Application Publication No. 50-3789, the inner cutter is the inner cutter of a normal reciprocating electric shaver. The inner cutter moves in a circular arc reciprocating motion, unlike the one that reciprocates in a straight line, but this inner cutter has a large number of small blades that are attached to the base (inner cutter holder) so that each cutting edge is approximately perpendicular to the curved inner surface of the outer cutter. They are constructed by being buried in a state where they are arranged at predetermined intervals in the sliding direction. According to this, because of the shape of the outer blade, it is easy to fit the outer blade to the concave curved surface under the chin, making it easier to shave in that area, and furthermore, the cutting edge of each small blade of the inner blade is shaped like the curved surface of the outer blade. Since all of the blades are aligned equally and approximately at right angles to the inner surface, even in a reciprocating electric shaver equipped with an outer cutter that has a curved surface that curves along the reciprocating sliding direction of the inner cutter, when the inner cutter slides back and forth, the It can exhibit the same sharpness in both the forward and backward strokes of reciprocating motion.

0003

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, all the cutting edges of a large number of small blades actually forming the inner cutter are arranged so as to be equally and substantially perpendicular to the curved inner surface of the outer cutter. When embedding the cutter blade in the blade holder, it is advantageous to use a molding method in which the cutter blade is held in the mold and insert-molded into the base, allowing for mass production. If the molded product is held within the mold, a problem arises in that it becomes difficult or impossible to remove the molded product from the mold due to the relationship between the inclination angle of the cutter blade and the direction in which the mold is removed.

SUMMARY OF THE INVENTION An object of the present invention is to simplify the manufacture of the inner cutter in a reciprocating electric shaver having an outer cutter having a curved surface along the sliding direction of the inner cutter. shall be.

[0005]

[Means for Solving the Problems] The inner cutter of the reciprocating electric shaver of the present invention has a flexible first inner cutter as shown in the illustrated example.
A cutter blade 7 is disposed on the base 9, and the first base 9 is curved so that the cutting edge of the cutter blade 7 is substantially perpendicular to the curved inner surface of the outer cutter 2. The curved shape of the first base 9 is held by the second base 11.

[0006]

[Operation] By arranging the cutter blade 7 on the first base 9 and then curving the first base 9, the cutting edge of the cutter blade 7 is aligned approximately perpendicularly to the curved inner surface of the outer cutter 2. Since the blade 4 is made so as to be obtained, insert molding of the cutter blade 7 at the stage of arranging it on the first base 9 can be performed without the problem of mold release.

[0007]

Effects of the Invention According to the present invention, the inner cutter 2 can be easily constructed in which all of the cutting edges can be aligned approximately at right angles to the curved inner surface of the outer cutter, which has a curved surface curved along the sliding direction of the inner cutter. can be manufactured.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 6. In FIG. 1, 1 is a main body case of a reciprocating electric shaver, 2 is an outer blade removably provided with an outer blade holder 3 on the upper part of the main body case 1, 4 is an inner blade, and 5 is an arrow A with a pivot 6 as the center. A drive rod that swings in the direction causes the inner cutter 4 connected to the upper end of the drive rod 5 to reciprocate and slide against the inner surface of the outer cutter 2.

The outer cutter 2 is formed into a rectangular dome shape, and is curved in an outward convex shape with a predetermined radius of curvature along the sliding direction A of the inner cutter 4, and is curved in a convex shape along a direction perpendicular to the direction A. It is curved in an outward convex shape with a radius of curvature smaller than the radius of curvature. Note that although the outer cutter 2 is curved along the sliding direction A of the inner cutter 4, it is not necessarily curved along the direction perpendicular to the sliding direction A, and may be made into a flat surface. good.

The inner cutter 4 is manufactured as follows. first,
As shown in FIG. 3, a large number of small blades 7 are inserted in a parallel arrangement at predetermined intervals in the sliding direction A of the inner blade 4 in a flat first base 9 made of flexible material such as ABS resin. Shape. During this insert molding, the cutter blade 7 is embedded perpendicularly to the flat first base 9, so the molded product can be easily released from the mold by taking it out from the mold in a direction parallel to the cutter blade 7. can.

Next, as shown in FIGS. 4 and 5, in separate upper and lower molds 10a and 10b, the cutting edge of each small blade 7 is aligned approximately at right angles to the curved inner surface of the outer cutter 2, as shown in FIG. The first base 9 is held in a curved state so as to obtain the right angle. As a holding means, ribs 12 arranged on the same arc drawn with a predetermined curvature on the inner surface of the lower mold 10b are used.
By supporting the protrusion 13 provided on the side surface of the first base 9, the first base 9 is curved to a predetermined curvature, while the upper mold 1
The curved state of the first base 9 is maintained by pressing it with the lower surface convex portion 10c of the first base 9. After that, a resin having higher rigidity than that of the first base 9, for example, a molten resin of glass-filled PBT, is applied to the lower mold 10b.
The second base 1 is injected inward to cover the outside of the first base 9.
1 is integrally molded on the first base 9. By covering the first base 9 with the highly rigid second base 11 in this way, the first base 9 does not return from a curved shape to a flat shape, and its curved shape is always maintained reliably. A finished inner cutter product as shown in FIG. 2 is obtained.

After the inner cutters 4 assembled in this way are hardened, the two inner cutters 4 are assembled into a cylindrical shape using a temporary fixing tool (not shown) as shown in FIG. grinding wheel 1
The blade is sharpened by polishing the blade between 4 and 15 minutes. After setting the blades, remove the temporary fasteners and separate the inner blades 4.

FIGS. 7 to 9 show variants of the means for holding the blank in the mold. As shown in FIGS. 8 and 9, ribs 12 arranged in a predetermined curvature on the inner surface of the lower mold 10b support the lower surface 9a side of the first base 9 to curve it to a predetermined curvature, while the upper mold The first base 9 is held in a curved state by being pressed by the lower surface convex portion 10c of the first base 9. Under this holding, the second base 11 is integrally molded on the first base 9.

In another embodiment shown in FIGS. 10 and 11, a cylindrical cutter blade 7 is formed by winding a cutter steel wire with a square cross section in a spiral shape.
is made, and as shown in FIG. 10, insert molding is performed to embed substantially the lower half of the cutter blade 7 into the first base 9. Then,
As shown in FIG. 11, a first base 9 is curved and a second base 11 is integrally molded on the outside of the first base 9, as in the case of the above embodiment.

12(A)(B)(C) and FIG. 13
shows still another embodiment. In this embodiment, the first base 9 is formed by pressing a metal plate such as stainless steel, and at the same time, the inner cutter 4 is made by integrally cutting and raising the small blade 7 from the first base 9, and this is made of plastic. the second of
It is embedded in the base 11. In this case, by stacking and embedding two or more of the inner cutters 4 as shown in FIG. 14, the cutter blades 7 can be arranged at a small pitch.

Instead of integrally molding the first base 9 and the second base 11, a second base having a recess 16 as shown in FIG.
The base 11 may be molded separately, and the first base 9 with the cutter blade 7 embedded in the recess 16 may be curved and press-fitted. In addition, as shown in the figure, the first base 9 is divided into two parts and three parts.
It may be divided into parts.

The structure in which the first base 9 and the second base 11 are integrally attached can be modified in various other ways, and in that attached state, the first base
Any material that can maintain the curved state of the base 9 may be used. For example, as shown in FIG. 16, the second base 11 is formed into a curved shape with a predetermined curvature and has a groove 17 along the curved surface, and the flexible first base 9 is formed on this. The provided protrusion 19 and edge 20 are inserted into the groove 17 of the second base 11.
It can also be held on the second base 11 by inserting and fitting into the edge 21 and curving it. In this case, it is easy to bend and deform the first base 9 at its edge 2.
It is also possible to provide a partial cutout 22 at 0.

In FIG. 13, the inner cutter 7 is moved from the first base 9 made of metal.
The second base made of plastic is made by cutting and raising it.
1, but instead of this, as shown in FIG.
The base 9 may be curved and held on a second base 11 having a shape as shown in FIG. 17(B). In this case, a holding claw 23 is provided on the second base 11 side, and this holding claw 23
is engaged with the hole 24 on the first base 9 side from the outside or inside (outside in the illustrated example). Further, it is preferable to provide a support rib 25 on the first base 9 side or the second base 11 side to reliably support the curved state of the first base 9.

As shown in FIGS. 18A and 18B, the first base 9 and the second base 11 are provided with holes 26 and 27 for dropping hair debris, respectively, and as shown in FIGS. )
As shown in the figure, with the first base 9 curved, the second base 1 is
1 can also be elastically fitted from above.

In the embodiment shown in FIG. 1, the second base 11 is directly connected to the driving rod 5, but instead of this, as shown in FIG. 18(A), a vibrator 29 is connected to the driving rod 5. The second base 11 can also be attached to this vibrator 29.

As a means for curving the first base 9 with a predetermined curvature, instead of deforming the entire first base 9 into a circular arc shape, the first base 9 is curved as shown in FIG. 19(A). Platform 9
A concave line 30 is provided between each of the small blades 7 and 7, and the (
As shown in B), the first base 9 can also be curved and deformed into a multi-stage folded shape via the concave line 30. By employing such a curving method, even if the depth of embedding the base of the cutter blade 7 in the first base 9 is deep and the embedding force is increased, the blade can be easily curved.

In the embodiment shown in FIG. 19, the recessed lines 30 may be provided at a pitch of two or three cutter blades instead of between each cutter blade 7. In this case, the cutting edge line that connects the cutting edges of each small blade 7 is difficult to form a continuous arc shape and difficult to follow the outer cutter 2, but in this case, by polishing the cutting edge, it becomes almost perpendicular to the curved inner surface of the outer cutter 2. You can follow it.

Furthermore, if the recessed line 30 is provided on the lower surface side of the first base 9 as shown in FIG. Problems such as the accumulation of hair and the difficulty of cleaning can be solved, and when the first base 9 is integrally molded with the second base 11, the resin of the second base 11 enters the recessed line 30, so that both It also increases the bonding strength between them.

In each of the above-described embodiments, the first base 9 is bent so that the cutting edge line is highest at the center in the sliding direction of the inner blade and becomes lower as it approaches both ends in the sliding direction of the inner blade. However, on the contrary, as shown in Fig. 21, the first base is shaped so that the cutting edge line is lowest at the center in the sliding direction of the inner blade and becomes higher toward both ends in the sliding direction of the inner blade. The stand 9 can also be bent in the opposite direction. When the inner cutter 4 is formed in this way, the outer cutter 2 is also formed to have a curved surface to match the curved surface. According to this, it is possible to shave by shaving the outer cutter 2 along a convex curved surface such as the chin. make it easier

[Brief explanation of drawings]

FIG. 1 is a cutaway front view showing the main parts of a reciprocating electric shaver.

FIG. 2 is a sectional view of the inner cutter.

FIG. 3 is a front view of a blank inner cutter.

FIG. 4 is a longitudinal sectional front view showing a state in which a blank inner cutter is held in a curved shape within a mold.

FIG. 5 is a longitudinal sectional side view showing a state in which a blank inner cutter is held in a curved shape within a mold.

FIG. 6 is a diagram showing the state of sharpening and polishing the inner cutter.

FIG. 7 is a longitudinal sectional front view showing a mold showing another embodiment in a separated state.

8 is a longitudinal sectional front view of the mold of the embodiment shown in FIG. 7 in a state where they are combined; FIG.

9 is a longitudinal sectional side view of the mold of the embodiment shown in FIG. 7 in a state where they are combined; FIG.

FIG. 10 is a front view of a blank inner cutter showing still another embodiment.

11 is a front view of a completed inner cutter of the embodiment shown in FIG. 10. FIG.

FIG. 12 is a manufacturing process diagram of an inner cutter showing still another embodiment.

13 is a longitudinal sectional front view showing a completed inner cutter of the embodiment shown in FIG. 12. FIG.

FIG. 14 is a longitudinal sectional front view of an inner cutter showing still another embodiment.

FIG. 15 is a longitudinal sectional front view showing still another embodiment with the first base and the second base separated.

FIG. 16 is a perspective view showing still another embodiment with the first base and the second base separated.

FIG. 17 is a perspective view of a first base and a sectional view of a state in which the first base and the second base are attached, showing still another embodiment.

FIG. 18 is an exploded perspective view and a sectional view showing still another embodiment.

FIG. 19 is a front view of a first base showing still another embodiment.

FIG. 20 is a front view of a first base showing still another embodiment.

FIG. 21 is a front view of an inner cutter showing another embodiment.

[Explanation of symbols]

1 Main body case 2 Outer blade 4 Inner blade 7 Small blade 9 First base 11 Second base

Claims (1)

[Claims] 1. A reciprocating electric shaver in which an inner cutter 4 reciprocates against the inner surface of an outer cutter 2, and the outer cutter 2 has a curved surface along a sliding direction A of the inner cutter 4. The inner cutter 4 is provided with a small blade 7 on a flexible first base 9.
is arranged, and the first base 9 is curved so that the cutting edge of the small blade 7 is along substantially perpendicular to the curved inner surface of the outer cutter 2, and the outside of the first base 9 is curved so that the cutting edge of the small blade 7 follows the curved inner surface of the outer cutter 2. Change the shape to the second base 11
An inner blade of a reciprocating electric razor characterized by being held in place.