JPS6347478B2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention relates to electric razor blades.

(Background Art) Conventionally, in a rotary electric razor in which an inner cutter slides and rotates on the inner surface of an outer cutter, as shown in FIG. A slit-shaped blade hole 21a is formed extending from the top surface to the side surface. However, since the outer cutter 21 is generally formed of a thin plate with a uniform thickness, when the skin is pressed against the slit-shaped cutter hole 21a, the amount of skin S that enters into the slit-shaped cutter hole 21a is reduced as shown in Fig. 13. It has been experimentally confirmed that the number increases as the distance approaches the corner of the outer cutter 21 (δ ₀ <δ ₁ ), as shown in FIG.

For this reason, the length of the inner blade 22 is set to the length of the outer blade 21.
If an attempt is made to extend the range of hair that can be effectively cut by extending it to near the corner of the blade, there is a drawback that the inner blade 22 damages the skin S that has entered through the slit-shaped blade hole 21a. Furthermore, if a slit is provided on the outer periphery of the outer cutter made of a thin plate, the strength will be reduced and the outer periphery will be damaged. As a method to eliminate this drawback, it is possible to reduce the width of the slit-shaped cutter hole 21a as it approaches the outer periphery of the outer cutter 21, but in this case, long hairs near the corners of the outer cutter 21 are not allowed to enter the slit-shaped cutter hole 21a. The function of introducing
The problem was that there was no point in setting it up.

(Object of the Invention) The present invention has been proposed in view of the above points, and its object is to provide an electric razor that introduces long hair with high efficiency and can cut hair without damaging the skin. The purpose is to provide the blade.

(Disclosure of invention) The present invention will be explained below with reference to the drawings.

1 to 4 show a first embodiment of the present invention, and in FIGS. 1 and 2 showing an electric razor using the present invention, a battery (not shown) is provided inside the main body 1. The main body 1 has a built-in motor 2 driven by a motor 2, and is configured so that an outer cutter frame 4 to which an outer peripheral flange portion of an outer cutter 3 is fixed is attached to the upper part of the main body 1. Further, an inner cutter frame 7 to which a plurality of inner cutter blades 5 are attached via pressure springs 6 is engaged with the lower surface of the outer cutter 3 so that rotational motion is transmitted to the motor shaft 2a of the motor 2. The inner blades 5 are brought into sliding contact with the inner surfaces of the outer blades 3 by push-up springs 6. Furthermore, outer blade 3
A large number of small holes 3a are bored in the central part of the outer cutter 3, and slit-shaped cutter holes 3b are formed at equal pitches around the outer cutter 3 and communicate with each other from the top surface to the side surface of the outer cutter 3 on the outer periphery. This allows for effective introduction of hair.

As shown in FIGS. 3 and 4, the part of the outer cutter 3 having the small hole 3a is formed of a thin plate, and the outer cutter 3 has a radial ridge 3 that forms the slit-shaped cutter hole 3b.
c, the plate thickness is thinner at the part near the small hole 3a, and the outer cutter 3
The thickness of the plate gradually increases as it approaches the outer corner of the plate. In other words, the thickness of the inside plate of 3c is
When t ₀ and the plate thickness near the outer corner are t ₁ ,
There is a relationship of t ₀ < t ₁ , and the board is formed so that the plate thickness gradually increases from the inside to the outside.

With this configuration, as shown in FIG. 3, it is possible to prevent the skin S from protruding into the inner blade sliding area below the outer cutter 3 near the outer periphery of the outer cutter 3,
There is no need to worry about damaging your skin. Also, the width of the corner part of the slit-shaped blade hole 3b in FIG.
_B1 can also be made as wide as or more than the width _B0 of the portion near the small hole 3a, without impairing the introduction of the long hairs H into the slit-like blade hole 3b. In addition,
It is also possible to make B ₁ wider than B ₀ to improve the introduction of long hairs H.

Next, FIGS. 5 and 6 show a second embodiment of the present invention. The second embodiment is an embodiment that solves the difficulty of processing the first embodiment in which the thickness of the plate near the outer peripheral portion is increased using a single outer cutter. In this embodiment, a large number of small holes 8a are bored in the center of the first outer cutter 8 formed of a thin plate, and the outer cutter 8
A slit-shaped cutter hole 8b communicating from the upper surface of the outer cutter to the side surface is radially arranged in the outer peripheral corner portion of the cutter. Further, at the upper end of the outer cutter frame 9, there is provided a direction from the side surface of the outer cutter 8 toward the center, and an outer cutter 8.
A large number of comb-shaped second outer cutters 9a are arranged side by side, and are formed so as to overlap the slits 8c forming the slit-like cutter holes 3b. Here, these second outer blades 9a
The pitch in the circumferential direction is kept the same as that of the bevel 8c, and a slit-shaped cutter hole 9b is provided between the second outer cutters 9a, similarly to the first outer cutter 8.

Then, the plate thickness of the second outer cutter 9a is set so that _t0 < t1, where _t0 is the end on the center side of the first outer cutter ₈ and _t1 is near the outer circumference. The plate thickness is configured to gradually increase from the center side toward the outer periphery.

According to this embodiment, the state during use is as shown in FIG. 6, and since the skin S does not protrude into the inner blade sliding surface near the outer periphery of the first outer cutter 8, the skin S is It won't hurt you. Further, unless the width B of the second outer cutter 9a is made larger than the width of the ridge 8c of the first outer cutter 8, there is no risk of impairing the introduction of the long hairs H. That is, the first outer cutter and the second outer cutter have the same effect as the first embodiment.

Next, FIGS. 7 and 8 show a third embodiment of the present invention. That is, the first outer cutter 8 formed in the same manner as in the second embodiment is attached to the outer cutter frame 4, so that the first outer cutter 8 closely contacts and overlaps the inner surface of the slit-shaped cutter hole 8b and the slit 8c of the first outer cutter 8. Second
An outer cutter 10a is provided. These second outer cutters 10a have slit-shaped cutting holes 10c like the first outer cutters 8, and have their proximal ends fixed to a support frame 10 disposed on the inner surface of the outer cutter frame 4. , the width B ₁ and pitch of the second outer cutter 10a are set equal to that of the length 8c of the first outer cutter 8, and the plate thickness of the second outer cutter 10a is set equal to that of the outer cutter 8c, as in the second embodiment. It is set so that it gradually becomes thicker as it goes towards the end. Note that the second outer cutter 10a
The inner cutter blade 5 is in sliding contact with the lower surface of the inner cutter 5, that is, the surface on the opposite side that is in close contact with the first outer cutter 8, and a cutting edge is formed in the corner portion 10b of the lower surface.

In this embodiment, when in use, as shown in FIG. 8, the amount of skin S protruding toward the inner blade 5 side can be reduced by the second outer cutter 10a.
At the same time, the slit-shaped blade hole 1
There is no risk of impairing the introduction of long hairs to 0c and 8b.

Next, FIGS. 9 to 11 show a fourth embodiment of the present invention. This embodiment is characterized in that the outer cutter 3 is formed in the same manner as in the first embodiment, and that a vibration ring 13 is disposed on the inner surface of the outer cutter frame 4 via bearings 11 and 12. This vibration ring 13
is provided with an engagement groove 13a on the inner side of the lower end, and a comb portion 13b on the upper end that comes into contact with the lower surface of the shaft 3c of the outer cutter 3 as shown in FIG. 10, and has a gear 14a fixed to the motor shaft 2a. Through the intermediate gear 14b and the gear 14c fixed to the eccentric shaft 15, the eccentric shaft 15, which moves eccentrically, engages with the engagement groove 13a, causing reciprocating vibration along the circumferential direction of the outer cutter 3. ing.

According to this embodiment, as shown in FIG. 11, the hair H caught on the edge of the bar 3c of the outer cutter 3 is brushed away by the comb portion 13b at the tip of the vibrating ring 13, so that no pain is felt. This has the effect that the bristles H are drawn into the sliding area of the inner blade and are cut smoothly. At this time, the width b ₁ of the comb portion 13b in the circumferential direction (vibration direction) is slightly smaller than the width b of the comb 3c, and a value Δa that is slightly larger than the dimensional difference is set.
It is only necessary to slightly vibrate the vibration ring 13 in the circumferential direction. Note that this example is similar to the second example and the third example.
Needless to say, the present invention can be applied to the embodiments.

(Effects of the Invention) As described above, according to the present invention, an outer cutter is provided with a slit-shaped cutter hole that communicates from the upper surface to the side surface of the outer cutter near the outer periphery of the outer cutter, and the inner surface of the outer cutter is In an electric razor blade equipped with a sliding inner cutter, the thickness of the outer cutter forming the slit-shaped cutter hole is gradually increased from the center side to the outer circumference of the outer cutter. A safe and comfortable electric razor with no risk of damaging the skin, as the outer edge of the outer blade has increased strength and the skin pressed against the slit-shaped hole of the outer blade does not protrude into the sliding area of the inner blade. It is effective in providing the following.

In addition, since the function as a slit-shaped blade hole can be maintained as before, it has the advantage that long hair can be introduced and cut smoothly.

In addition, by providing the second outer cutter, the first outer cutter has a uniform thickness and is easier to process, and the second outer cutter supports the strength, making it possible to provide a safe and comfortable electric shaver. be.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a perspective view of an electric razor, and FIG.
The figure is a sectional view, FIG. 3 is a sectional view of the main part, FIG. 4 is a perspective view, and FIGS. 5 and 6 are the second embodiment of the present invention.
Embodiment 5 is a perspective view of the main parts, FIG. 6 is a cross-sectional view, and FIGS. 7 and 8 show a third embodiment of the present invention, with FIG. 7 showing the main parts. 8 is a sectional view, and FIGS. 9 to 1 are a perspective view of the section.
1 shows a fourth embodiment of the present invention, FIG. 9 is a sectional view of the main part, FIG. 10 is a partial perspective view of the vibration ring, and FIG. 11 is a cross-sectional view of the X in FIG. −
The X sectional view, FIGS. 12 and 13 show a conventional example, with FIG. 12 being a perspective view of the main part, and FIG. 13 being a sectional view. 3, 8, 9a, 10a...outer blade, 3b, 8b,
9b, 10c...Slit-shaped blade hole, 5...Inner blade.

Claims (1)

[Claims] 1. An outer cutter having a slit provided near the outer periphery of the outer cutter that communicates from the top surface to the side surface of the outer cutter;
In this electric razor blade equipped with an inner cutter that slides on the inner surface of the outer cutter, the thickness of the outer cutter forming the slit is gradually increased from the center side of the outer cutter toward the outer periphery. An electric razor blade characterized by: