JPS62381A - Outer blade of reciprocal 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 (Field of Industrial Application) The present invention relates to an outer blade of an electric razor in which the inner blade reciprocates on the inner surface.

(Prior Art) As an outer blade of such a conventional reciprocating electric razor, a structure as shown in, for example, Japanese Patent Publication No. 12305/1983 is known. In other words, this example is shown in Fig. 6, where the elongated hair introduction holes (hereinafter referred to as blade holes >1.1.' pointing upward to the left and upward to the right) alternate in the direction perpendicular to the sliding direction The same blade holes are arranged in a row in the sliding direction X of the inner blade. However, this arrangement of blade holes had the following problems. .

(1) In the configuration of the blade hole row a parallel to the sliding direction X of the inner cutter,
There is a zone A corresponding to the area where hair is not sufficiently introduced (the shaded area in the figure), and the corresponding large area of the blade hole 1 in the moving direction Y of the electric razor (the cross-hatched area) A is also small. . In order to improve this problem, a blade hole 1' facing upward is provided in the moving direction Y of the electric razor, but the improvement effect is not sufficient. The reason for this is explained below.
When lUm-m is drawn in the moving direction Y of the electric razor through the center point to the above zone, the length of the intersection with the cutting edge line of the blade hole 1' is the width of the blade hole that determines the hair introduction effect. This is a dimension that depends on the width B of the blade hole in the short direction, and by slightly changing the moving direction Y of the electric razor, θ
Even if you shift the cutting edge (1 or 1') to the left by
This is because since it is approximately rectangular, the length of the intersection Ae is not much different from the length of the intersection Uu. In addition, @0-0, which is approximately perpendicular to the line n-n connecting the center of gravity of the blade hole 1 shape facing upward to the left, passes through the center of gravity of the blade hole 1' shape facing upward to the right and a position away from the center of gravity, and the cutting edge 1' is line 0. -・It spreads only on one side compared to 0, and the introduction of hair on the side of the blade hole where it does not spread is not good.

(2) Since the blade holes (1 or 1') facing the same direction are adjacent to each other in the sliding direction of the inner cutter, the crosspieces 2 are arranged in a straight line and parallel to the inner cutter sliding direction. For this reason, it is susceptible to bending in a direction perpendicular to the sliding direction of the inner cutter, and the crosspiece 2 is often damaged.

This is particularly a serious problem when the outer cutter plate is made of a flexible material and is attached to the outer cutter frame with a semicircular cross section, that is, an arch shape, through its attachment hole.

(Object of the Invention) The present invention has been made in view of the above-mentioned conventional problems, and provides an outer cutter that allows for good hair introduction and has high outer cutter strength by optimizing the arrangement of the cutter holes. The purpose is to

(Structure of the Invention) The present invention has a gourd-shaped cutter hole whose longitudinal direction faces upward to the right and an inner cutter that slides in the left and right directions on the inner surface, and a gourd-shaped cutter hole whose longitudinal direction faces upward to the left with respect to the sliding direction of the inner cutter. The gourd-shaped blade holes are arranged adjacent to each other alternately, and the blade holes in the same direction are separated via a crosspiece in the approximate sliding direction of the inner blade, and the center of gravity of the blade hole shape facing upward to the left is connected. A line that passes through the midpoint of the line and is substantially orthogonal to the line connecting the center of gravity, passes near the center of gravity of the blade hole shape facing upward to the right, and connects the center of gravity of the blade hole shape facing left or right upward. is the outer cutter that is inclined with respect to the sliding direction of the inner cutter.

With this configuration, the area where hair is not sufficiently introduced is reduced, and the bars of the blade hole are no longer arranged parallel to the sliding direction of the inner blade.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 5. In Figures 1 to 3, 3 is the electric razor body, 4 is an outer blade frame, 5 is an outer blade made of a flexible plate attached to the outer blade frame 4 in an arc shape, and 6 is an outer blade 5. A sling-shaped recess is provided at approximately the middle or top of the skin, and is formed to stretch the skin and improve the introduction of hair. , 7 is a mounting hole for attaching the outer cutter 5 to the outer cutter frame 4, 8.8' is a hole in the outer cutter 5, 9 is a plain part where a cutter hole is not formed in the outer cutter 5, and 10 is a semicircle. A plurality of plate-shaped inner cutter blades 10a are spaced apart from each other and arranged in parallel on a straight line, and are pressed into contact with the inner surface of the outer cutter 5 mounted in an arch shape by a push-up spring 11, Moreover, it is caused to reciprocate and slide in the left and right direction by a drive source. 10
b is a relief recess provided at a position corresponding to the recess 6 of the inner cutter blade 10a.

The pattern of the outer cutter 5 is shown in FIGS. 4 and 5. Reference numeral 8 denotes a gourd-shaped blade hole with the longitudinal direction of the hole facing upward to the left, and 8' denotes a gourd-shaped blade hole with the longitudinal direction of the hole facing upward to the right, and these are arranged adjacent to each other alternately. Further, the blade holes 8 or 8' facing the same direction are arranged in a separated manner via a crosspiece 12 in the sliding direction X of the inner blade. The perpendicular bisector of the center of gravity of the shape of the cutter hole 8 arranged substantially in the sliding direction X of the inner cutter passes through the vicinity of the center of gravity of the shape of the cutter hole 8' in the opposite direction. That is, with respect to the line 1-1 passing through the centers of gravity P and Q of the shape of the blade hole 8, a line t'-t' that is approximately orthogonal between P and Q is the line 1-1 that passes through the center of gravity P and Q of the blade hole 8 shape.
' Passes through the centers of gravity R and S of the shape.

Further, the arrangement of the blade holes 8 or 8' in the same direction is configured to have an inclination θ with respect to the sliding direction X of the inner blade, that is, the line U-.U. Note that 13 is the constriction of the gourd-shaped blade hole.

By arranging the blade holes 8, 8' in this way, the following effects can be obtained. The area where hair introduction is insufficient is line 1.
-1 is zone C of the crosspiece 12, and the hair riding on this zone C moves on the crosspiece 12 and passes through one of the blade holes 8' having centers of gravity R and S. This blade hole is line t
Since it is spread out on both sides relative to '-t', the introduction of hair is good, and even long hair can be introduced. That is, the blade hole 8' facing upwardly to the left on the line 1-1 passes through the midpoint of the center of gravity P and Q, and runs in the opposite direction, that is, upwardly to the right, on a line t-1' that is approximately perpendicular to this. By arranging the blade holes so that the center of gravity R8 is located, hair that has not been introduced in the area of line t- can be omitted in the next blade hole.

Furthermore, the blade holes 8 and 8' are shaped like gourds, and the sliding direction of the inner blade is X.
By inclining the row of blade holes by an angle θ, the following effect can be obtained. Regarding zone C where it is difficult to introduce hair, in the conventional case where the electric razor is not tilted, the blade hole width that determines the introduction of hair at the next blade hole in the moving direction Y of the electric razor is 81 in FIG. 5, but as described above Due to the gourd shape and inclination, the width of the blade hole is approximately perpendicular to the blade hole and the line U-U.
B2 is determined by the intersection with u 1, and B1 < 82
This can improve the hair introduction rate. Moreover, when the blade hole is formed into a gourd shape, the skin is prevented from being introduced into the blade hole by the constricted portion at the intermediate position. Therefore, the maximum width of the blade hole can be widened, improving the hair introduction rate.
You can increase the shaving speed. In addition, there is no crosspiece of the same shape parallel to the sliding direction X of the inner cutter, that is, 1Qu-u, and there is also an effect that the outer cutter is strong against arch-like bending.

In addition, when the outer cutter 5 is formed in an arch shape, the shape of the blade hole 8.8' near the top T (FIG. 4) is short in length in the longitudinal direction, and near the periphery D (FIG. 4). The shape of the blade holes 8, 8' is configured such that the length in the longitudinal direction is long. With this configuration, hair can be shaved shorter with the short hole near the top, and the long hair introduction rate can be further improved with the long hole near the periphery. It is.

(Effects of the Invention) As described above, according to the present invention, the am-shaped blade holes are alternately arranged adjacent to each other with the longitudinal direction facing upward to the right and upward to the left with respect to the sliding direction of the inner blade, and The blade holes are separated in the inner blade sliding direction via a crosspiece, and the blade holes in one direction are separated on a line that passes through the midpoint of the line connecting the centers of gravity and is approximately perpendicular to the line connecting the center of gravity positions in the other direction. The blade hole is arranged so that the center of gravity of the blade hole is located, and the line connecting the center of gravity of the blade hole in the same direction is inclined with respect to the sliding direction of the inner blade, improving the hair introduction rate, The shaving speed is increased, and since the crosspiece of the blade hole no longer exists parallel to the sliding direction of the inner blade, the strength of the outer blade can be improved and the life of the outer blade can be extended.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of an electric razor embodying the present invention, FIG. 2 is a perspective view of an outer blade in an expanded state according to an embodiment of the invention, and FIG. 3 is a side view of an electric razor in pressure contact with the inner surface of the outer blade. FIG. 4 is a plan view of the outer cutter in an expanded state showing the hole pattern of the outer cutter, FIG. 5 is a partially enlarged plan view of the outer cutter, and FIG. 6 is a portion of the conventional outer cutter. FIG. 5...Outer blade, 8.8'...Blade hole, 10...Inner blade,
12... Crosspiece, P, Q, R, S... Center of gravity, θ... Inclination angle, X... Sliding direction of inner cutter. Patent applicant Matsushita Electric Works Co., Ltd. Figure 1 Figure 2 Figure 1 (Ja

Claims (1)

[Scope of Claims] 1. An inner cutter that slides in the left-right direction is in pressure contact with the inner surface, and with respect to the sliding direction of the inner cutter, there is a gourd-shaped cutter hole with the longitudinal direction facing upward to the right and a hole with the longitudinal direction facing upward to the left. Gourd-shaped blade holes are arranged adjacent to each other alternately, the blade holes in the same direction are separated via a crosspiece in the approximate sliding direction of the inner blade, and a line connects the center of gravity of the blade hole shape facing upward to the left. A line that passes through the midpoint and is substantially orthogonal to the line connecting the center of gravity, passes near the center of gravity of the blade hole shape facing upward to the right, and a line connects the center of gravity of the blade hole shape facing left or right upward. The outer blade of a reciprocating electric razor is characterized by being inclined with respect to the sliding direction of the inner blade. 2. The blade is formed in an arch shape, and the length of the blade hole near the top of the blade is shorter in the longitudinal direction than the gourd-shaped blade hole near the periphery. The outer blade of the reciprocating electric razor listed.