JPH0611358B2 - Electric razor outer blade - Google Patents

Description

TECHNICAL FIELD The present invention relates to an outer blade of an electric razor.

(Background Art) The sharpness of an electric razor can be judged by the quality of the cut surface of the beard. That is, as shown in FIG. 12, if the cutting surface H'of the beard H is flat, it has a good sharpness, and if the cutting surface H'has a trace like that shown in FIG. Can be said to have poor sharpness because it is cut in tension. The poor sharpness is due to the gap d between the outer blade 31 and the inner blade 32 as shown in FIG. In addition, in FIG. 14, reference numeral 33 denotes a blade hole of the outer blade 31.

Generally, when a flat plate like the outer blade 31 of an electric razor is bent into a U-shaped cross section, a warp d ′ is generated at the top of the outer blade 31 as shown in FIG. And outer blade 31
It has been a cause of the gap d between and. In FIG. 15, 34 is an outer blade mounting hole, 35 is a blade hole forming region, and 36 is a sliding contact region of the inner blade 32. The way of generating the warp d ′ is considered to be due to the shape of the blade hole forming area 35 of the outer blade 31, and is actually complicated due to the difference in rigidity between the blade hole forming area 35 and other portions. It is thought that warping is occurring.

On the other hand, from the viewpoint that the gap between the inner blade 32 and the inner blade 32 can be reduced by reducing the warp of the top of the outer blade 31, a blade hole forming region 37 as shown in FIG. 16 is provided. Is proposed. That is, the width of the central portion of the blade hole-shaped region 37 is increased along the direction Y orthogonal to the inner blade sliding direction X, and the rigidity of this portion is reduced to reduce the outer blade 31 and the inner blade blade.
It improves the adhesion to 32. As a result, it was confirmed that the warp d ″ at the top of the outer blade 31 was slightly reduced. Therefore, when the outer blade 31 and the inner blade 32 are slid to observe the sliding state of the inner surface of the outer blade 31,
In the example of the figure, it was found that the sliding region 38 was narrowed at the central portion of the outer blade 31. This is because the rigidity of the central portion and both end portions in the Y direction is smaller than that of the other portions, so that the extension of the other portions in the X and Y directions acts on the portion of low rigidity, and this portion slides on the inner blade 32. Probably because it is displaced to the side opposite to the moving surface.

Assuming that the magnitude of strain in the X direction is x and the magnitude of strain in the Y direction is y, both x and y are relatively large at the central portion of the outer blade 31 and x and y at both end portions in the X direction, as shown in the figure. Both are very small. Also, although the curving becomes smaller toward the end, distortion still remains at the end in the Y direction. The adhesion is better than that of Figure 15, but not perfect.

That is, in the example shown in FIG. 15, the outer blades at both ends in the X direction
Deterioration of sharpness due to the gap between the 31 and the inner blade 32.
In the example of FIG. 6, there is a problem that the sharpness is deteriorated due to the formation of a gap at the end in the central Y direction.

(Object of the invention) The present invention has been proposed in view of the above points, and its object is to make an even contact with an inner blade blade evenly, and to obtain an excellent sharpness. To provide a blade.

(Disclosure of the Invention) Hereinafter, the present invention will be described with reference to the drawings. 1 to 5
The drawing shows the first embodiment of the present invention, and in FIGS. 1 and 2, reference numeral 1 shows a flat outer blade made of a thin metal plate. This outer blade 1 excludes both end portions in the sliding direction of the inner blade blade (X direction in the drawing) and the peripheral portion of the outer blade mounting hole 2 in the direction orthogonal to the sliding direction. It has a blade hole forming region 3 in which a blade hole is formed up to a portion. The blade hole forming region 3 is narrow at the center in the X direction and wide at both ends. By partially changing the width of the blade hole forming region 3 in the Y direction in this way, the sliding contact region with the inner blade changes, but in this embodiment, in the narrow portion of the blade hole forming region 3. The width of the sliding contact region 4 is widened, and the gap between the inner blade 1 and the outer blade 1 can be reduced.

Assuming that the magnitude of strain in the X direction is x and the magnitude of strain in the Y direction is y, both x and y are relatively large in the central portion of the outer blade 1 as shown in the figure. By partially increasing the rigidity of the end portion in the Y direction at the center portion in the X direction and reversing the direction of strain, the radius of curvature is increased and the close contact with the inner blade is improved. Further, since the strain at the end in the Y direction at the center in the X direction becomes almost zero and the flexure changes (partial convex flexure), the local contact with the inner blade is eliminated. , The whole is in close contact.

3 and 4 show a main part of an electric razor using the outer blade 1 according to the present invention, in which 5 is an inner blade blade, 6 is an outer blade mounting frame, and 7 is an outer blade member. Claw, 8 outer blade fixing plate, 9 main body housing, 10 a driver,
FIG. 3 is a sectional view corresponding to a portion where the width of the sliding contact area 4 in FIG. 1 is l ₂ , and FIG. 4 is a portion corresponding to the same portion 1 ₁ . Further, FIG. 5 is also a front view of a main part of the electric razor, in which a part of the electric razor is cut away.

Next, FIGS. 6 and 7 show a second embodiment of the present invention. In this embodiment, the width in the Y direction of the blade hole forming area 3A of the outer blade 1A is changed stepwise, and the width in the central portion in the X direction is the narrowest as in the first embodiment. Here, the width of the sliding contact area 4A in the Y direction is determined by the blade hole forming area 3A.
Caused by the difference in bending rigidity of the outer blade 1A in the bending direction between the narrow portion of the blade hole forming area 3A and the entire portion of the blade hole forming area 3A, and between the narrow portion and the wide portion of the blade hole forming area 3A. If the difference is too small, the sliding contact area 4A cannot be made wide, so it is desirable to make the difference in width as large as possible.

8 and 9 show a third embodiment of the present invention in which the blade hole forming region 3B is expanded in the Y direction to a portion including the outer blade mounting hole 2 to form the outer blade 1B. The difference A between the narrow portion and the wide portion of the formation region 3B is increased. Also in this example, it is possible to widen the sliding contact area 4B.

Further, FIG. 10 shows the fourth embodiment of the present invention, in which the rigidity of the outer blade 1C is reduced by notching the portions other than the substantially rectangular blade hole forming region 3C at both ends in the Y direction. It has good adhesion to the inner blade.

(Effects of the Invention) As described above, according to the present invention, an outer blade formed of a thin metal plate and curved in a U-shaped cross section, and an inner blade that slides on the inner surface of the outer blade. In an electric razor provided with a blade, the rigidity of both ends of the outer blade in a direction orthogonal to the sliding direction in substantially the central portion in the sliding direction of the inner blade, the sliding at both ends in the sliding direction. Since the rigidity is higher than that of both ends in the direction orthogonal to the moving direction,
As shown in the figure, the adhesion between the outer blade 1 (1A to 1C) and the inner blade 5 can be improved, and the gap near the top of the outer blade can be made smaller as compared with the conventional drawing of FIG. When the sliding contact area with the inner blade at the central portion of the outer blade is narrowed as in the conventional example shown in FIG. 16, there is no inconvenience and there is an effect that good sharpness can be obtained.

[Brief description of drawings]

1 to 5 show a first embodiment of the present invention. FIG. 1 is a plan view, FIGS. 2 (a) and 2 (b) are perspective views, and FIGS. 3 and 4 are electric. FIG. 5 is a side sectional view of a main part of the razor, FIG. 5 is a front sectional view of the same part, FIGS. 6 and 7 show a second embodiment of the present invention, and FIG. 6 is a plan view and FIG. 7 is a perspective view. FIGS. 8, 8 and 9 show a third embodiment of the present invention. FIG. 8 is a plan view, FIG. 9 is a perspective view, and FIG. 10 is a plan view showing a fourth embodiment of the present invention. , FIG. 11 is an explanatory view of the operation of the present invention, FIGS. 12 to 14 are explanatory views of the operation of a conventional example,
FIG. 15 and FIG. 16 each show a conventional example, (a) of each drawing is a plan view, and (b), (c), and (d) of each drawing are perspective views. 1, 1A, 1B, 1C ... Outer blade, 3, 3A, 3B, 3C
...... Blade hole forming area, 4, 4A, 4B ...... Sliding contact area, 5 ...
… Inner blade.

Claims (3)

[Claims] 1. An electric razor provided with an outer blade formed of a thin metal plate and curved in a U-shaped cross section, and an inner blade that slides on the inner surface of the outer blade. The rigidity of both ends of the blade in the direction substantially orthogonal to the sliding direction at substantially the center of the sliding direction of the inner blade, the rigidity of both ends in the direction orthogonal to the sliding direction at both ends of the sliding direction. Outer blade of electric razor characterized by making it higher than. 2. The width of the blade hole forming region along the direction orthogonal to the sliding direction of the inner blade is made narrower at the substantially central portion in the sliding direction than at both ends thereof. The outer blade of the electric razor according to item 1. 3. The width of the blade hole forming region along the direction orthogonal to the sliding direction of the inner blade is made wider stepwise from substantially the center to both ends in the sliding direction. The outer blade of the electric razor according to the second item.