JPH04220281A - Outer blade of reciprocating type electric razor - Google Patents

Abstract

PURPOSE:To prevent the deformation and damage of an area in which the inner blade does not come into slide-contact without exerting influence e the cutting quality by making the rigidity small in the center part in the inner blade sliding direction. large in both end parts, and varying gradually the rigidity between them. CONSTITUTION:In the reciprocating motion direction X of the inner blade, the center part of a blade hole 10, both end parts, and the part between a first area (i) and a second area (ii) are set as a first area (i) having small rigidity, a second area (ii) having large rigidity, and a third area (iii) whose rigidity becomes gradually larger toward the second area (ii) side. In this case, in a first area (i) in which the inner blade of the center part always comes into slide contact, the loading-in/cutting performance of a beard can be secured. and in a second area (ii), even when an impact is applied onto the outer blade it high strength which can stand against it is obtained. In a third area (iii), generation of a saddle type warp of the outer blade 1 caused by a sudden variation of rigidity is suppressed and the cutting quality is secured.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer cutter for a reciprocating electric shaver.

0002

2. Description of the Related Art A conventional example is shown in FIG. 4 and subsequent figures. Two outer cutters 1, 1 are attached in parallel to the upper end of a main body 3 of the electric shaver via an outer cutter frame 2. Each of the outer blades 1, 1 is made of an elastic thin metal plate, and is attached to the outer blade frame 2 in a semicylindrical shape.
As shown in FIG. 5, an inner cutter 4 that is reciprocally driven is in contact with the inner surface of the inner cutter 4 while receiving an upward biasing force from a push-up spring 5.

0003

[Problem to be solved by the invention] Here, the inner cutter 4
When the outer cutter 1 performs reciprocating motion under the drive of the driver 6, the outer cutter 1
There are a region B where the inner cutter 4 makes sliding contact and a region C where it does not make any sliding contact. A in the figure indicates a range where both ends of the inner cutter 4 come into sliding contact. In area B, even if force or impact is applied to the outer cutter 1, it is supported by the inner cutter 4 on the inner side, so it does not easily bend and will not be deformed or damaged. In region C, since there is no support on the inner surface side, it is very easy to bend, and there is a high possibility that it will lead to deformation and damage.

[0004] For this reason, it is possible to prevent deformation and damage by increasing the rigidity of the outer cutter 1 in region C to make it difficult to bend. For example, as shown in FIG. If the blade hole is removed and the area becomes plain, the change in rigidity between the area where the blade hole is formed and the plain area becomes extremely steep, and the area of the blank area becomes so wide that it cannot be ignored. Therefore, when the outer cutter 1 is curved, a phenomenon occurs in which the outer cutter 1 is warped in a saddle shape as shown in FIG.
The adhesion between the blade and the inner cutter 4 deteriorates, resulting in poor cutting quality.

The present invention has been made in view of the above points, and its purpose is to provide a reciprocating type that can prevent deformation and damage in areas where the inner blade does not make sliding contact without affecting the cutting quality. We provide the outer blades of electric razors.

[0006]

[Means for Solving the Problems] The present invention provides a first region with low rigidity at the center in the sliding direction of the inner blade, a second region with high rigidity at both ends, and a first region and a second region. By setting the third region where the rigidity gradually changes between the This makes it possible to increase the rigidity and prevent saddle-shaped warpage from occurring in the outer cutter.

[0007]

[Embodiments] The present invention will be described in detail below based on the illustrated embodiments. Fig. 1 shows an outer cutter for a reciprocating electric shaver of the type in which two outer cutters are mounted in parallel as shown in Fig. 4. 1, in which the X direction is the reciprocating direction of the inner cutter 4, and the Y direction is the direction facing the other outer cutter 1.

The outer cutter 1 is made of an elastic thin metal plate with a large number of holes 10 formed therein, and is used in a semi-cylindrical shape. Different blade holes 10 are formed at various locations as shown in FIG. In other words, in the reciprocating direction The third region iii is such that the stiffness gradually increases toward the region ii. The difference in rigidity is that the blade hole 10 in the first area i is made larger, the blade hole 10 in the third area iii is made smaller, and the blade hole 10 in the second area i is made smaller.
The blade hole 10 in i is made smaller as it goes from the first area i side to the second area ii side. FIG. 3 shows changes in rigidity in the direction of this reciprocating motion.

In this case, since the aperture ratio of the first region i, in which the inner blade 4 in the center always slides, is high, the introduction cutting performance of whiskers can be ensured, and in the second region ii, the outer blade Even when a shock is applied to the third region iii
Since the rigidity is gradually changed, the saddle-shaped warping of the outer cutter 1 that would occur due to a sudden change in rigidity is suppressed, and sharpness is ensured.

[0010] In the embodiment shown here, the area near the top when curved also in the Y direction perpendicular to the reciprocating direction In area A, there is a blade hole 10 with a shorter length in the transverse direction, and in area B outside of the area B, a blade hole 10 with a longer length in the transverse direction is provided on the side facing the other outer cutter 1.
has been set up. This is to reduce irritation to the skin and increase the efficiency of whisker introduction. In area C, which is further outside area B, the inner blade 4 does not make sliding contact, and therefore does not contribute to cutting the beard, but a small blade hole 10 is provided to avoid sudden changes in rigidity. .

FIG. 3 shows the relationship between the sliding area A where the end of the inner cutter 4 slides against the outer cutter 1 as it reciprocates, and the rigidity distribution of the outer cutter 1. Even if the sliding area A is located within the third area iii as shown in (a), (b)
It may be arranged to span the third region iii and the second region ii as shown in (c), or it may be located in the second region ii as shown in (c).

By the way, the rigidity of the outer cutter 1 can be changed depending on the aperture ratio of the cutter holes 10, but the aperture ratio mainly depends on the width of the crosspiece between the cutter holes 10, the size of the cutter holes 10, and the cutter hole 10. 10
It can be changed by changing the pitch of the outer blade, or by changing the thickness of the outer cutter. of course,
Some of these may be used in combination to vary the stiffness.

[0013]

Effects of the Invention As described above, the outer cutter of the present invention has a third region where the rigidity gradually changes between the first region of low rigidity at the center and the second region of high rigidity at both ends. By setting it to
This makes it possible to prevent the outer blade from developing a saddle-shaped warp and becoming dull.

[Brief explanation of the drawing]

FIG. 1 is a developed view of an embodiment of the present invention.

FIG. 2 is a stiffness distribution diagram same as above.

FIG. 3 is an explanatory diagram showing the relationship between the rigidity and the inner blade end sliding area.

FIG. 4 is a perspective view of a reciprocating electric shaver.

FIG. 5 is a sectional view of the same as above.

FIG. 6 is a developed view of a conventional outer cutter.

FIG. 7 is an explanatory diagram of the saddle-shaped warpage same as above.

[Explanation of symbols]

1 Outer blade i 1st area ii Second area iii Third area X Reciprocating direction

Claims (1)

[Claims] Claim 1: A first region with low rigidity is provided at the center in the sliding direction of the inner blade, a second region with high rigidity is located at both ends, and the rigidity gradually changes between the first region and the second region. An outer blade of a reciprocating electric shaver comprising a third region.