JP2625050B2 - Electric razor outer blade structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer blade structure of an electric razor in which an outer blade plate is provided with a whisker cut portion having a whisker introduction hole having a large opening area and a row of small holes located on both sides thereof. It is.

[0002]

2. Description of the Related Art A reciprocating electric shaver having an outer blade structure of this type is disclosed in, for example, FIG.
No. 85).

In the electric shaver shown in FIG. 4, a semi-cylindrical outer blade 2 is mounted on one end of a main body case 1, and an inner blade 3 is arranged inside the outer blade 2.

The inner cutter 3 has a cutting blade support 3a extending in the longitudinal direction of the outer cutter 2, and a number of cutting blades 4 protruding from the cutting blade support 3a at a constant pitch in the longitudinal direction. . The cutting blade body 4 extends in the width direction and elastically contacts the inner surface of the outer cutter 2.

Further, the inner cutter 3 is linked to a motor 6 via a conversion mechanism 5 for converting the rotation into a reciprocating motion. When the motor 6 is operated, the longitudinal direction of the outer cutter 2 (FIG.
It is reciprocated in the direction of arrow X in the middle. Since this structure is well known, its description is omitted.

As shown in FIG. 5, the outer blade 2 has a beard cut portion 7 formed at the center of an outer blade plate 2a made of a steel plate, and has a beard cut portion 7 on both sides of the outer blade plate 2a. A small hole row portion 8 is formed adjacent to.

The beard cut portion 7 includes a plurality of vertical mustache introduction hole rows 7a, 7a,... Comprising a large number of parallelogram-shaped beard introduction holes 2b having a large opening area. Are formed at intervals in the width direction.

By the way, in the above-mentioned outer cutter 2, the opening area of the mustache introduction hole 2b is large, and the mustache introduction holes 2b, 2b
Since the interval between them is narrow, if the mustache section 7 provided with the mustache introduction hole 2b is provided on the entire outer blade plate 2a, when the outer blade plate 2a is used for a beard sled in a state of being curved in a semi-cylindrical shape, Depending on the thickness of the outer blade plate 2a, it is difficult to secure the strength of the outer blade plate 2a.

On the other hand, since the portion used for actually cutting the beard is the center portion in the width direction of the outer blade plate 2a, only the beard introduction hole 2b is provided only at the center portion in the width direction of the outer blade plate 2a. In this case, the strength of the outer blade plate 2a may be ensured.

However, in this case, since the elastic force at the center in the width direction of the outer blade plate 2a where the mustache introduction hole 2b is provided is much weaker than that at the side, the outer blade plate 2a may be curved into a semi-cylindrical shape. Then, a large bending stress is concentrated on the boundary between the widthwise central portion of the outer blade plate 2a where the mustache introduction hole 2b is provided and the side portion where the mustache introduction hole 2b is not provided. There is a possibility of entering, which is not preferable.

For this reason, as described above, by providing the small hole row portion 8 composed of a large number of small holes 2c adjacent to the beard cut portion 7 on both sides of the outer blade plate 2a, the mustache introduction holes of the outer blade plate 2a are provided. A large bending stress is not concentrated on the boundary by preventing the elastic force between the central portion in the width direction provided with 2b and the side portion not provided with the beard introduction hole 2b from being largely different.

Further, in order to prevent the mustaches located between the mustache introduction holes 2b, 2b from remaining without being cut, each mustache introduction hole 2 of each of the vertical mustache introduction hole rows 7a, 7a,.
b is slightly shifted in the direction intersecting the arrangement direction. As a result, the arrangement direction of the row of vertical beard introduction holes 7a is inclined by the angle θ with respect to the longitudinal center line 9 of the outer blade plate 2a.

According to this arrangement, when the outer cutter 2 is moved in the longitudinal direction or the width direction, a certain mustard introduction hole 2 is formed.
b, 2b are introduced into any of the mustache introduction holes 2b of the vertical mustache introduction hole rows 7a, 7a,... with the movement operation of the outer cutter 2, and cut by the inner cutter 3. become.

However, since the arrangement direction of the vertical mustard introduction hole rows 7a is inclined by the angle θ with respect to the longitudinal center line 9 of the outer blade plate 2a, the mustache introduction hole rows 7a on both sides of the beard cut portion 7 are provided. Is provided up to the longitudinal end of the outer blade plate 2a,
The entire beard cut portion 7 is inclined by θ with respect to the longitudinal center line 9 of the outer blade plate 2a, and there is a portion where the beard cut portion 7 is not located substantially at the center of the outer blade plate 2a, which is very preferable in terms of beard warpage. is not.

Therefore, in order to avoid such a state,
A boundary portion 10 between the beard cut portion 7 and the small hole row portion 8 such that the distance between the side edge of the beard cut portion 7 and the side edge of the outer blade plate 2a is substantially constant over the entire area in the longitudinal direction of the outer blade plate 2a. Is formed in a step shape so that the beard cut portion 7 is located substantially at the center of the outer blade plate 2a over the entire area in the longitudinal direction.

[0016]

However, if the boundary portion 10 between the beard cut portion 7 and the small hole array portion 8 is formed in a step-like manner, the pitch of the mustache introduction holes 2b, 2b and the small hole array Depending on the pitch of the small holes 8a of the portion 8, for example, FIG.
Steps 10a, 10b, 10c,... Of the boundary 10 shown in FIG.
Are different in width C1, C2, C3.
The strength of the steps 10b, 10c,...
Bending stress concentrates on the narrowest portion of the portions 0a, 10b, 10c, and 10d, and cracks may occur in these portions, which is not preferable. In addition, a step portion 10e of the boundary portion 10,
There is a similar problem with widths B1, B2, etc., such as 10f, 10g, etc.

In view of the above, the present invention is based on the problem that the width of the stepped boundary formed between the beard cut portion and the row of small holes and the width of the stepped portion differ depending on the pitch of the mustache introduction holes and small holes. It is an object of the present invention to provide a shaver-free outer blade structure.

[0018]

In order to achieve this object, an electric shaver outer blade structure according to the first aspect of the present invention comprises a plurality of mustache introduction holes arranged in a width direction of the outer blade plate. A plurality of the mustache introduction holes are provided in the middle of the outer blade plate in the width direction while being provided at an intermediate position inclining with respect to the longitudinal center line of the outer blade plate. A mustache cut section consisting of a row of mustache introduction holes is provided,
An outer blade of an electric razor provided with a row of small holes formed by arranging a large number of small holes smaller than the opening area of the whisker introduction hole in a stitch shape on both sides in the longitudinal direction of the outer blade plate adjacent to the whisker cut portion. In the structure, the boundary between the beard cut portion and the small hole row portion is such that an interval between the boundary edge of the beard cut portion and the boundary edge of the small hole row portion is substantially constant over the entire longitudinal direction of the outer blade plate. The portion is formed in a step shape, and the pitch in the width direction of the mustache introduction hole row is set to an integral multiple of the pitch in the width direction of the small hole row section.

In the invention according to claim 2, a pitch of a portion corresponding to each step of the boundary portion of the mustache introduction hole row is set to an integral multiple of a longitudinal arrangement pitch of the small hole row section. It is characterized by.

[0020]

In such a configuration, since the width of the boundary between the beard cut portion and the small hole row portion is formed to be the same,
The bending stress does not concentrate on any of the steps forming the boundary in a stepwise manner, and this bending stress acts uniformly on each step.

[0021]

Next, one embodiment of the present invention will be described with reference to FIGS.

In FIG. 2, a semi-cylindrical outer blade 12 is mounted on one end of a main body case 11, and an inner blade 13 is disposed inside the outer blade 12.

The inner cutter 13 has an inner cutter support 13a extending in the longitudinal direction of the outer cutter 12 (in the direction of arrow X in the figure), and a plurality of protrusions projecting from the inner cutter support 13a at equal pitches in the longitudinal direction. A cutting blade body 14 is provided. The cutting blade body 14 extends in the width direction of the outer cutter 12 and is in elastic contact with the inner surface of the outer cutter 12.

Further, the inner blade support 13a is linked to a motor 16 via a conversion mechanism 15 for converting the rotation into a reciprocating motion.
2 is reciprocated in the longitudinal direction. At this time, the cutting blade 1
4 is the longitudinal direction while sliding on the inner surface of the outer cutter 12
(In the direction of arrow A). Since this structure is well known, its description is omitted.

As shown in FIG. 3, the outer cutter 12 includes an outer cutter plate 12a made of a steel plate, a beard cut portion 17 located at the center of the outer cutter plate 12a, and a bead cut portion 1a.
7 has small hole row portions 18 located on both sides of the outer blade plate 12a.

The beard cut portion 17 is formed by arranging a plurality of vertical mustache introduction hole rows 17a, 17a,... At a center in the width direction of the outer blade plate 12a made of a steel plate in a horizontal direction.
The vertical mustard introduction hole row 17a is formed by arranging a large number of parallelogram-shaped mustache introduction holes 12b having a large opening area at an equal pitch P1 in the longitudinal direction of the outer blade plate 12a.

Moreover, in order to prevent the mustaches located between the mustache introduction holes 12b, 12b from remaining without being cut, the mustache introduction holes 12b of the vertical mustache introduction hole rows 17a, 17a,. Are slightly shifted in the direction intersecting with.

As a result, each vertical mustard introduction hole row 17a, 17
a,.. are slightly shifted by the same amount in the direction intersecting the arrangement direction, so that the arrangement direction of the vertical mustache introduction hole row 17a is the longitudinal center line 19 of the outer blade plate 12a.
With respect to the angle θ.

Further, adjacent vertical mustache introduction hole rows 17a, 1
Since 7a is slightly shifted by the same amount in the longitudinal direction,
Horizontal beard introduction hole rows 17b, 17b,.
And 17c, 17c,... Are formed. The pitch P2 of the mustache introduction holes 12b, 12b of each of the horizontal mustache introduction hole rows 17b, 17b,... And 17c, 17c,.

According to this arrangement, when the outer blade 12 is moved in the longitudinal direction or the width direction, a certain mustache introduction hole 1 is formed.
The beard located between 2b and 12b is introduced into any of the mustache introduction holes 12b of each of the vertical mustache introduction hole rows 17a, 17a,... become.

The boundary 20 between the beard cut portion 17 and the small hole row portion 18 is formed such that the distance between the side edge of the beard cut portion 17 and the side edge of the outer blade plate 12a is in the entire longitudinal direction of the outer blade plate 12a. It is formed stepwise so as to be substantially constant. Thereby, the beard cut portion 17 is located substantially at the center of the outer blade plate 12a over the entire area in the longitudinal direction.

The small hole row portion 18 includes a plurality of vertical small hole rows 18a, 1
8a are formed at a constant pitch in the width direction on the side of the outer blade plate 12a in the width direction. The vertical small hole row 18a has a plurality of small holes 12c formed at a constant pitch in the longitudinal direction of the outer blade plate 12a. P
3 is formed. The direction in which the vertical small hole row 18a extends is inclined by an angle θ with respect to the longitudinal center line 19, and the adjacent vertical small hole row 18a,
18a are arranged with a shift of 1/2 pitch in the longitudinal direction.

Thus, horizontal small hole rows 18b, 18b,... And 18c, 18c,. This horizontal small hole row 18b, 18b,.
are the pitch P4 of the small holes 12c, 12c.
It is formed identically. Thereby, the arrangement shape of the plurality of adjacent small holes 12c is a regular triangle.

The boundary portion 20 is formed by step portions 20a, 20a.
Steps 20b, 20c, and 20d and steps 20e, 20f, and 20g form a step-like shape.

Further, since the widthwise pitch P2 of the horizontal mustache introduction hole rows 17b and 17c is set to an integral multiple of the widthwise pitch P4 of the small hole row portion 18, the step portions 20e and 20f of the boundary portion 20 are formed. The widths B1, B2, etc. of 20 g are formed identically. Thus, the boundary portion 20 is formed in a step-like manner so that the interval between the boundary edge of the beard cut portion 17 and the boundary edge of the small hole row portion is substantially constant over the entire area in the longitudinal direction of the outer blade plate 12a.

Further, the boundary portion 20 of the vertical mustache introduction hole row 18a
The pitch A of the portion corresponding to each step portion 20a, 20b, 20c, 20d is the longitudinal arrangement pitch P3 of the small hole row portion 18.
Are set to integral multiples of the widths C1, C2, C of the steps 20a, 20b, 20c, 20d of the boundary 20.
3 and the like are formed identically.

Next, the operation of the electric shaver having such a configuration will be described.

In such a configuration, the beard cut portion 1
Steps 20a, 2 of boundary 20 between 7 and small hole row 18
Since the widths C1, C2, C3, etc. of 0b, 20c, 20d are formed to be the same, bending stress concentrates on any of the step portions 20a, 20b, 20c, 20d which form the boundary portion 20 in steps. This bending stress is not applied to each step 2
0a, 20b, 20c, and 20d act uniformly.

Similarly, steps 20e, 20e of the boundary 20
Since the widths B1, B2, etc. of 20f, 20g, etc. are formed identically, each stepped portion 20 that forms the boundary portion 20 in a stepped shape
e, 20f, and 20g, the bending stress does not concentrate on any of the step portions 20e, 20f, and 2g.
It works even on 0 g.

[0040]

According to the present invention, as described above, the beard cut portion and the small bead cut portion are so arranged that the interval between the boundary edge of the beard cut portion and the boundary edge of the small hole row portion is substantially constant over the entire longitudinal direction of the outer cutter plate. Since the boundary between the row of holes is formed stepwise, and the pitch in the width direction of the mustache introduction hole row is set to an integral multiple of the pitch in the width direction of the small hole row. The width of the steps at the stepwise boundary formed between the beard cut portion and the row of small holes can be made the same by the pitch of the mustache introduction holes and small holes. As a result, the bending stress does not concentrate on any of the steps forming the boundary in a stepwise manner, and this bending stress acts uniformly on each step, so that the outer blade plate is used at the time of beard warpage. Can be prevented from being generated at the step of the boundary by the bending stress acting on the boundary.

In addition, the pitch of the portion corresponding to each step of the boundary portion of the row of mustache introduction holes is set to be an integral multiple of the pitch in the longitudinal direction of the small hole row portion. The width of the stair-shaped boundary formed between the mustache cut portion and the row of small holes can be made equal by the pitch of the introduction holes and small holes. The bending stress does not concentrate on any of the steps, and this bending stress also acts uniformly on each of the steps. Cracks can be prevented from occurring at the step portion of the portion.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part for explaining an outer blade structure of an electric razor according to the present invention.

FIG. 2 is a sectional view of an electric shaver having an outer blade having the structure of FIG.

FIG. 3 is an overall development view of an outer blade having a mustache introduction hole of FIG. 1;

FIG. 4 is a longitudinal sectional view showing an example of a conventional electric shaver having an outer blade.

FIG. 5 is an overall development view showing an example of an outer blade structure.

FIG. 6 is an explanatory view of a main part of the outer blade shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Outer blade 12a ... Outer blade plate 12b ... Beard introduction hole 12c ... Small hole 17 ... Beard cut part 17a ... Vertical mustache introduction hole row 18 ... Small hole row part 18a ... Vertical small hole row 19 ... Longitudinal center line 20 ... Boundary Sections 20a, 20b, 20c, 20d Steps 20e, 20f, 20g Steps

Claims (2)

(57) [Claims] A whisker introduction hole array comprising a plurality of whisker introduction holes is provided at the middle in the width direction of the outer cutter plate so as to be inclined with respect to a longitudinal center line of the outer cutter plate. By providing a plurality of rows in the width direction on the blade plate, a beard cut portion including a number of mustache introduction hole rows is provided in the width direction central portion of the outer blade plate, and a number of small holes smaller than the opening area of the mustache introduction hole are stitched. In an outer blade structure of an electric razor provided with a row of small holes arranged in a shape adjacent to the beard cut portion on both longitudinal sides of the outer blade plate, a boundary edge of the beard cut portion and the small hole row portion A boundary portion between the beard cut portion and the small hole row portion is formed in a step-like manner so that an interval with a boundary edge of the outer blade plate is substantially constant throughout the longitudinal direction of the outer blade plate, and the beard introduction hole is formed. The widthwise pitch of the row is an integral multiple of the widthwise pitch of the small hole row portion. An outer blade structure for an electric razor, wherein the outer blade structure is set to: 2. The method according to claim 1, wherein a pitch of a portion corresponding to each step of the boundary portion of the mustache introduction hole row is set to an integral multiple of a longitudinal arrangement pitch of the small hole row section. The outer razor structure of the electric razor.