JPH088948B2 - Electric razor outer blade - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an outer blade of an electric shaver manufactured by an electroforming method.

[Conventional technology]

The outer blade of the electric razor is manufactured by the following electroforming method. That is, after depositing a resist layer on the upper surface of the metal substrate, this layer is exposed in a predetermined pattern.
Next, the surface of the metal substrate in the exposed portion is etched, and then the resist layer is removed.
Then, the metal substrate is subjected to primary plating to form a primary plating layer portion A to be deposited below the surface of the metal substrate at a position corresponding to the exposed portion of the metal substrate, and to the non-exposed portion. At a corresponding position, the primary plating layer portion B deposited on the upper side of the surface of the metal substrate is formed. Finally, a release agent is applied to the entire surface of the primary plating layer, and then secondary plating is performed thereon. By this plating treatment, a secondary plating layer (that is, an outer blade) attached to the primary plating layer portion B is formed. The portion facing the primary plating layer portion A of the secondary plating layer is a hole through which whiskers pass, and
The hole edge becomes a cutting edge portion corresponding to the height of the primary plating layer portion B. The secondary plating layer as an outer blade formed in this way is separated from the metal substrate and provided as an outer blade.

Then, the conventional outer blade obtained by such a manufacturing method is provided with a central portion provided with innumerable holes of a size through which a whisker passes and a peripheral portion thereof as illustrated in Japanese Patent Publication No. 53-47745. A blind plate-shaped portion to be mounted, a plurality of fixing holes for mounting the mounting plate provided on the edge side of the blind plate-shaped portion, and if necessary, to form a boundary between the central portion and the blind plate-shaped portion And a transition part that is formed.

Such an outer blade for a reciprocating electric shaver is attached to the outer blade base by engaging both end portions of a mounting plate attached to the edge of the outer blade with the engaging grooves provided on the inner surface of the outer blade base. On the other hand, it is mounted in a semi-cylindrical shape, and the inner blade slides on the inner surface of the central part, cutting the whiskers passing through the hole in the central part with the inner blade and the cutting edge part of the hole. It is supposed to do. In the transition portion, for example, there are innumerable holes smaller than the hole in the central portion and through which whiskers pass, but since this portion does not contact the inner blade, shaving is not performed, and such transition The portion is configured to increase the strength of the edge portion of the outer blade.

[Problems to be Solved by the Invention]

By the way, when the secondary plating is deposited by the electroforming method, the thickness of the plating layer is greatly influenced by the plating time and the current density. Then, according to the outer blade of the conventional configuration, the current density is not uniform in the central portion having the innumerable holes and the peripheral blind plate portion, and the current density of the blind plate portion is drastically reduced. Become. Therefore, the blind plate-shaped portion is thin and the central portion is thick. Further, even in an outer blade having a transitional portion having a myriad of holes between the central portion and the blind plate-shaped portion, the transitional portion is also affected by the blind plate-shaped portion whose current density sharply decreases. The thickness was different from the other parts. Although a small hole may be provided in the blind plate portion, it was not sufficient to reduce the thickness difference even in that case.

In the conventional outer blade having a thickness difference as described above, due to the external force acting at the time of shaving or the like, the bending and stress accompanying it are concentrated in the boundary portion causing the thickness change in the outer blade. There is a problem in that there is a high possibility that the boundary will be bent or damaged. In particular, in the outer blade of the reciprocating electric shaver, the thickness boundary portion of the outer blade is configured to be pressed against the opening edge of the outer blade body from the side surface side by external force during shaving. The damage was likely to occur at the thickness boundary portion.

An object of the present invention is to provide a strong electric razor outer blade capable of preventing bending and breakage.

[Means for solving the problem]

In order to achieve the above object, in the outer blade of the electric shaver of the present invention, innumerable holes of a size through which whiskers pass are provided on the entire inner surface surrounded by the peripheral edge that forms the outer shape, and each inner portion of the peripheral edge. The aperture ratio per unit area is the same.

[Action]

The outer blade having the above-mentioned structure is made by electroforming, but innumerable holes of a size through which whiskers pass are provided on the entire inner surface surrounded by the peripheral edge that forms the outer shape, and per unit area of each inner portion of the peripheral edge. By making the aperture ratios the same, it is possible to reduce the difference in the current density of each part during the secondary plating in the manufacturing thereof, so that the thickness of each part can be made uniform. In such an outer blade having a substantially uniform thickness, bending and stress are not locally concentrated and can be dispersed throughout.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 2, 1 is a body case of a reciprocating electric shaver,
It is projected from the top surface and is in the left-right direction (the second
An inner blade 3 is attached to an inner blade support shaft 2 that reciprocates in the front and back directions in the drawing). The inner blade 3 is biased upward by a coil spring 4 provided by winding the shaft 2. Further, an outer blade body 5 is detachably attached to the upper part of the main body case 1 so as to cover the inner blade 3. The outer blade body 5 is composed of an outer blade base 6 made of resin or light metal, and an outer blade 7 which is bent into a substantially half-cylindrical shape and attached so as to close the opening 6a of the outer blade base 6. Mounting plates 8 made of resin are attached to both side edges of the outer blade 7 by means such as heat staking, and both ends of these mounting plates 8 are provided on inner surfaces of both ends of the outer blade base 6, respectively, which are not shown in the drawings. The outer cutter 7 is attached to the outer cutter base 5 by being detachably engaged with the groove.
The inner blade 3 is in sliding contact with the inner surface of the outer blade 7 while being pressed by the coil spring 4.

The outer blade 7 is made by an electroforming method. The outer blade 7 has a beard not only on the entire inner surface surrounded by the peripheral edge 9 forming the outer shape thereof, and thus, not only in the central portion with which the inner blade 3 slides but also in the portion extending from the central portion to the peripheral edge 9. Is formed by providing an innumerable number of holes having a size for passing through, and the opening ratio per unit area of each inner portion of the peripheral edge 9 is made the same. The peripheral edge 9 is edged, thereby preventing tearing into the inside of the outer blade 7. In the case of the present embodiment, the innumerable holes through which the whiskers pass have the same shape and the same size, but the present invention is not limited to this, and plural kinds of holes having different shapes and sizes may be combined. . Further, a plurality of fixing holes 10 are provided at both edge portions along the length direction of the outer blade 7. These fixing holes 10 are much larger than the holes through which the whiskers pass, and the holes 10 are shaped by the hole edges 10a. Then, the hole edge 10a prevents tearing into the outer cutter 7. In addition, these fixing holes 10
A protrusion (not shown) for heat crimping the mounting plate 8 is inserted through the.

According to the outer blade 7 having such a configuration, innumerable holes each having a size through which the whiskers pass are provided on the entire inner surface surrounded by the peripheral edge 9 forming the outer shape, and the inner surface of the inner edge of the peripheral edge 9 per unit area is Since the aperture ratios are the same, when the outer blade 7 is manufactured by the electroforming method, the difference in the current density between the respective parts when the secondary plating is provided is reduced. Therefore, the thickness of each part of the secondary plating as the outer blade 7 can be made uniform.

According to the outer blade 7 having a substantially uniform thickness over the entire surface in this manner, when the outer blade 7 is pressed against the skin to shave, for example, a force is applied from the side surface direction indicated by the arrow in FIG. Even when it is received, the bending and stress associated therewith are not locally concentrated and can be dispersed throughout. For this reason, the outer blade 7 is less likely to be bent or damaged even after long-term use, and the strength of the outer blade 7 can be improved.

Further, the present invention is not limited to being applied only to the outer blade for the reciprocating electric shaver, but can be applied to the outer blade for the rotary electric shaver. In that case, if the outer cutter base is made of resin and the peripheral edge of the outer cutter is embedded in the outer cutter base to form the outer cutter base, part of the resin forming the outer cutter base is Since it is inserted into a myriad of holes in the inserted peripheral edge portion, it becomes possible to reliably prevent the outer blade from coming off the outer blade base.

〔The invention's effect〕

According to the present invention configured as described above, since the thickness of each part is made uniform, it is possible to prevent bending and stress from locally concentrating and to disperse them throughout, and thus to prevent bending and damage. An outer blade can be provided.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a plan view of an outer blade for a reciprocating electric shaver, and FIG. 2 is a side view showing a partial cross section of an upper portion of the reciprocating electric shaver. 7 ... Outer blade, 9 ... Edge of outer blade.

Claims (1)

[Claims] 1. In an electrocasting method, innumerable holes each having a size for a whisker to pass through are provided on an entire inner surface surrounded by a peripheral edge which forms an outer shape, and a per unit area of each inner portion of the peripheral edge. Outer blade for electric razor, which has the same aperture ratio.