JPH08323058A - Inner blade body of reciprocation electric shaver - Google Patents

Abstract

PURPOSE: To improve cutting performance and reduce shaving noises and to prevent a crack of an inner blade base in cutting by thicken the thickness of the inner blade and reducing the edge angle. CONSTITUTION: Multiple inner blades 2 are mounted on an inner blade base 1 arranged along the longitudinal direction of the inner blade base 1. Therein, an opening part 5 is formed in the inside of the inner blades 2 along the width direction to make a narrow part 6 with a narrow width in the width direction resulting in forming a part with low rigidity positioned between parts with high rigidity in the vertical direction of the inner blade 2. The position of the narrow width part 6 forming a part with low rigidity in the vertical direction is set to include the center of the arc of the top part of the inner blade 2 or the center of the outer shape of the inner blade 2 exposed on the inner blade base 1, or lower.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an inner blade of a reciprocating electric shaver.

[0002]

2. Description of the Related Art An inner blade of a reciprocating electric shaver of this type is disclosed in, for example, Japanese Unexamined Patent Publication No. 6-142347. As shown in FIG. 9, a large number of inner blades 2 are integrally formed on an inner blade base 1 made of synthetic resin or the like, and whiskers are prevented from scattering above the inner blades 2. For this purpose, a long hole 3 is provided as shown in FIG. 9A, or a plurality of round holes 4 is provided as shown in FIG. 9B.

[0003]

By the way, in the above-mentioned conventional example, in order to further improve the shaving taste, it is attempted to reduce the cutting edge by piling work. The plate thickness of the valley part of the part becomes thin,
It is necessary to increase the plate thickness in order to shorten the length of the inclined portion of the drop portion, to secure the strength of the drop portion and to secure the grinding allowance. When the plate thickness is increased as described above, there is a problem in that the rigidity is increased and the natural frequency is increased to exceed the audible sound range, and the shaving sound cannot be heard well. Further, in such a conventional example, as shown in FIGS. 9 (a) and 9 (b), the long holes 3 and the round holes 4 are provided on the upper part of the inner blade 2 for preventing the beard scattering. 3 and round hole 4
Has no role of reducing the rigidity of the inner blade 2,
9 shows how the inner blade 2 bends when a load is applied.
As shown in (c), there was almost no difference from the inner blade 2 having no hole. Further, in order to adjust the shaving sound, the rigidity is changed by changing the plate thickness of the inner blade 2 or changing the height of the inner blade base 1 by molding the lower part of the inner blade 2, etc. There is also an attempt to change the number, but if the plate thickness of the inner blade 2 becomes too thick, the natural frequency cannot be lowered only by setting the height of the inner blade base 1, and the shaving noise cannot be heard well. There was a problem.

Since the inner blade 2 has a high rigidity in the vertical direction, when the load is applied, the inner blade 2 is entirely bent as shown in FIG. 5 (a). The solid line indicates a state in which no load is applied to the inner blade blade 2, and the imaginary line indicates a state in which the inner blade blade is bent. Therefore, stress concentrates on the upper portion of the inner blade base 1, and particularly during grinding, the inner blade base 1 There was a problem that cracks occurred at the top of the.

Further, when the reciprocating motion of the inner blade is handled at a higher speed, fluttering of the inner blade occurs, and in order to solve this, it is necessary to set the drive transmission point of the reciprocating motion above the inner blade. However, there is a problem that the drive pin integrally provided on the driver hits the lower portion of the inner blade 2, and the drive transmission point cannot be set upward especially when the float amount of the inner blade is taken into consideration. Further, when the drive pin is inserted into the inner blade blade 2, the width of the portion of the inner blade base 1 which is a molded product for holding the inner blade blade 2 becomes narrower. There is also a problem that the holding power of 2 may be weakened.

The present invention has been made in view of the above problems, and an object of the present invention is to improve the sharpness by increasing the plate thickness of the inner blade and decreasing the blade angle. At the same time, it is to provide an inner blade body of a reciprocating electric razor capable of improving the shaving sound and preventing cracks of the inner blade base during cutting, and another object of the present invention is to provide an inner blade body of the inner blade body. An object of the present invention is to provide an inner blade body of a reciprocating electric razor capable of preventing the inner blade body from fluttering even if the reciprocating motion is accelerated.

[0007]

In order to achieve the above object, the first feature of the inner blade body of the electric razor of the present invention is that the inner blade base 1 is provided with a large number of inner blades 2. In the longitudinal direction of the inner blade 2, by forming an opening 5 inside the inner blade 2 in the width direction and providing a narrow portion 6 having a narrow width in the width direction, The vertical position of the narrow portion 6 that forms a low-rigidity portion between the high-rigidity portion and the high-rigidity portion and forms the low-rigidity portion is defined by the center of the arc of the top of the inner blade 2. , Or the center of the outer shape of the inner blade blade 2 exposed on the inner blade base 1 or positioned below the center.

The second feature of the inner blade plate of the electric shaver of the present invention is that the inner blade base 1 has a large number of inner blade blades 2 arranged in a row in the longitudinal direction of the inner blade base 1. Blade 2
By providing the thin-walled portion 7 with a reduced plate thickness, a low-rigidity portion is formed between the high-rigidity portion and the high-rigidity portion of the inner blade blade 2 in the vertical direction, and the low-rigidity portion is formed. The upper and lower positions of the thin portion 7 to be formed include the center of the arc of the apex of the inner blade 2 or the outer shape center of the inner blade 2 exposed on the inner blade base 1 or below the center. It is characterized by being formed.

The third inner blade of the electric shaver of the present invention
The first feature or the second feature is that the drive pin 9 provided integrally with the reciprocating drive element 8 reaches the inside of the inner blade 2 on the inner blade base 1 through the penetrating portion through which the drive pin 9 passes. And the inner blade blade 2 has a plate thickness of 0.1 to 0.3 mm.

[0010]

According to the first feature, by forming a portion of the inner blade 2 having a low rigidity in the narrow portion 6, the shaving noise can be secured even if the inner blade 2 is thickened. For this reason, the shaving sound can be secured, but the plate thickness of the inner blade 2 can be increased to reduce the blade edge angle and improve the sharpness. Further, since the inner blade 2 is bent at the narrow portion 6, stress is not concentrated on the inner blade base 1 of the molded product, and the inner blade base 1 during grinding is
Can be prevented from cracking.

According to the second feature, by forming a portion of the inner blade 2 having low rigidity in the thin portion 7, the shaving noise is secured even if the inner blade 2 other than the thin portion 7 is thickened. it can. Therefore, the shaving sound can be secured, but the blade angle can be reduced by increasing the plate thickness of the inner blade 2.
The sharpness can be improved. Further, since the inner blade 2 bends at the thin portion 7, stress is not concentrated on the inner blade base 1 of the molded product, and cracking of the inner blade base 1 during grinding can be prevented.

According to the third feature, the inner blade base 1 is provided with a penetrating portion through which the drive pin 9 provided integrally with the reciprocating drive element 8 passes.
Since it is provided so as to reach the inside of the upper inner blade 2, the drive transmission point from the drive pin 9 to the inner blade base 1 can be provided above, and the inner blade can be reciprocally driven at a high speed. Fluttering of the body can be prevented.

[0013]

The present invention will be described in detail below with reference to the illustrated embodiments. First, the first embodiment will be described. FIG. 2 shows an inner blade of a reciprocating electric shaver, in which a large number (28 in the present embodiment) of inner blades 2 are integrally formed on the upper portion of an inner blade base 1 of a molded product such as a synthetic resin. A joint portion 11 is attached to the lower portion of the inner blade base 2. The top of the inner blade 2 has an arc shape, and the lower leg portions on both sides in the width direction of the inner blade 2 are embedded in the inner blade base 1. At the center of the inner blade base 1 in the longitudinal direction, there is provided an insertion gap 12 which serves as a penetrating portion for penetrating a drive pin 9 described later. The thickness of the inner blade is preferably 0.1 to 0.3 mm.

FIG. 3 shows a state in which the driver element 8 is attached to the inner blade body of FIG. The driver element 8 has a vertically elongated drive pin 9 embedded in a driver element body 13,
The coiled spring 14 is provided inside, and the spring retainer 15 is formed on the upper end of the coiled spring 14. A pin receiving cylinder 16 is provided in the joint portion 11, and a drive pin 9 of a driver element 8 is vertically slidably inserted in the pin receiving cylinder 16 so that the joint portion can be reciprocally driven. 11
The inner blade base 1 and the inner blade 2 can be reciprocally driven via the. An inwardly projecting protrusion 16a is provided on the top of the pin receiving cylinder 16, and the protrusion 16a is in contact with the drive pin 9, and this contacted portion transmits the reciprocating motion of the driver element 8. It is the drive transmission point 17. A protruding piece 16b protruding from the lower end of the pin receiving cylinder 16 is placed on the spring retainer 15 and is biased so that the inner blade body floats upward. By bringing the drive transmission point 17 upward as shown in FIG. 3, fluttering of the inner blade can be prevented when the reciprocating movement of the inner blade is accelerated, but a predetermined float amount of the inner blade is secured. In order to do so, it is necessary to have a structure in which the drive pin 9 can be inserted into the inner blade 2. In the case of the present embodiment, since the inner blade 2 is provided with the opening 5 as will be described later, the drive pin 9 can be inserted into the opening 5, and even if the drive transmission point 17 is located above. In the case of this embodiment, which can obtain a sufficient float amount,
A bulged portion 18 reaching the upper end of the opening 5 of the inner blade 2 is provided at the center of the inner blade base 1 in the longitudinal direction, and the insertion gap 12 of the drive pin 9 is provided to the upper end of the bulged portion 18. It is provided.

FIG. 1 is a sectional view taken along the line AA of FIG. 2 with the joint portion 11 removed, and in this embodiment,
The inner blade 2 is provided with an opening 5 at the center in the width direction, and a narrow portion 6 having a narrow width is provided on both sides of the opening 5.
Even in this cross-section of the inner blade base 1, a gap 19 for beard removal
Is provided. Further, in the case of the present embodiment, the lower portion of the opening 5 is open, and the opening 5 and the gap 19 are in communication with each other. Further, the narrow portion 6 is formed by providing the opening 5 as described above. The vertical position where the narrow portion 6 is provided is at the center of the arc of the top of the inner blade 2, or the inner blade base. It is a position including or below the center of the outer shape of the inner blade 2 exposed on the table 1. In this way the width is w
And a narrow portion 6 having a height of h is formed on both sides, and a portion having a high rigidity indicated by a in the order from the upper part of the inner blade blade 2, a b
A portion having low rigidity and being soft, and a portion having high rigidity shown by symbol c are formed. Here, for example, the plate thickness is 0.2 mm
In the case of a stainless steel having a hardness of about Hv640, the inner blade 2 having a rigidity of 1.0 kgf / mm and a natural frequency of 8 kHz was obtained by setting h = 1.0 mm and w = 0.4 mm. . By forming a soft portion having low rigidity in the narrow portion 6 as described above, even if the inner blade 2 is thickened, the natural frequency is lowered and a shaving sound can be obtained. In addition, by increasing the plate thickness of the inner blade 2, it is possible to form a sharp blade edge in the pasting process and improve the sharpness.

FIG. 4 is a sectional view taken along line BB in FIG.
1 is a cross-sectional view in which 1 and the bulged portion 18 are omitted, and shows a state in which the inner blade body is pushed down against the coiled spring 14 and the drive pin 9 has entered the inner blade 2. With such a structure in which the drive pin 9 extends into the inner blade 2, it is possible to obtain a sufficient float amount even if the drive transmission point 17 is moved upward.

FIG. 5 shows a state in which a load is applied to the inner blade 2, and FIG. 5 (a) shows how the inner blade 2 in the prior art is bent, and FIG. 5 (b) shows the invention. 3 shows how the embodiment shown in FIG. 1 is bent. In FIG. 5, the solid line is a curved state in which the imaginary line is not curved, and the cross-hatched portion in FIG. 5B is a portion having a low rigidity due to the narrow portion 6 and is curved. In the conventional example of FIG. 5 (a), since the inner blade blade 2 has no significant difference in rigidity in the vertical direction, the inner blade blade 2 on the inner blade base 1 is entirely bent, The stress was concentrated on the portion where the upper surface of the base 1 and the inner blade 2 were in contact with each other, and the inner blade base 1 was cracked. However, in the present invention, as shown in FIG.
Since the bending occurs in the portion having low rigidity, stress is not concentrated on the inner blade base 1, and cracks do not occur on the inner blade base 1. In addition, as for this phenomenon, the width d of the clearance 19 for removing the beard of the inner blade base 1 is increased as a countermeasure against beard scattering, and the diameter of the drive pin 9 is increased in order to secure strength when speeding up the reciprocating motion. At times, when the width e of the insertion gap 12 for introducing the drive pin 9 is widened, it appears remarkably and the holding strength of the inner blade 2 may be weakened. However, according to the present invention, as described above, This problem is eliminated because the stand 1 is not burdened.

Next, a second embodiment will be described. The inner blade 2 of this embodiment is annular as shown in FIG. 6, and the lower portions of the plurality of inner blades 2 are integrally connected by a connecting portion 20. That is, the lower connecting portion 20 has an arcuate cross section in the longitudinal direction, and has a shape in which a plurality of annular inner blade blades 2 are integrally arranged in the longitudinal direction. That is, the inner blade blades 2 are formed in a row by cutting a portion other than the lower portion of the pipe-shaped material with a milling cutter at equal intervals in a direction orthogonal to the longitudinal direction of the material. Also in this case, the narrow portions 6 are provided on both sides of the inner blade 2. The vertical position at which the narrow portion 6 is provided is a position including or below the center of the outer shape of the inner blade 2 exposed on the inner blade base 1. In this way, the narrow portions 6 are formed on both sides, and a portion having a high rigidity indicated by a in the order from the upper portion of the inner blade blade 2,
A portion having a low rigidity and a low rigidity shown by a reference numeral b and a portion having a high rigidity shown by a reference numeral c are formed. Thus, the narrow portion 6
By providing the inner blade body, an inner blade body having a good shaving sound can be obtained even if the inner blade blade 2 is thick.

Next, a third embodiment will be described. As shown in FIG. 7, in this embodiment as well, as in the first embodiment, the narrow portion 6 is formed on both sides by providing the opening 5 at the center of the inner blade blade 2 in the width direction. Also in the case of this embodiment, the narrow portions 6 are formed on both sides at a position including or below the center of the outer shape of the inner blade blade 2 exposed on the inner blade base 1, and the upper portion of the inner blade 2 is formed. In order from, the high rigidity portion indicated by the reference sign a, the low rigidity and soft portion indicated by the reference sign b, and the high rigidity portion indicated by the reference sign c are formed. Even if the inner blade 2 is thick, the shaving noise is good. There is a blade. However, in this embodiment, the lower portion of the opening 5 is not opened. Therefore, it is suitable for the case where the drive pin 9 does not reach the inner blade 2 even if it floats.

Next, a fourth embodiment will be described. FIG. 8 is a view of the inner blade 2 viewed from the side, showing the inner blade base 1
The lower portion of the inner blade 2 is embedded in the inner blade 2, and the thin portion 7 is provided in the inner blade 2. The vertical position at which the thin portion 7 is provided is at a position including or below the center of the circular arc of the top of the inner blade 2, or the center of the outer shape of the inner blade 2 exposed on the inner blade base 1. is there. By forming the thin portion 7 in this manner, a portion having a high rigidity indicated by a reference numeral a, a portion having a low rigidity indicated by a reference numeral b which is soft and a portion having a high rigidity indicated by a reference numeral c are sequentially arranged from the upper portion of the inner blade 2. Is formed.

[0021]

According to the first aspect of the present invention, an inner blade is formed by forming an opening inside the inner blade in the width direction and providing a narrow portion having a narrow width in the width direction. The vertical position of the narrow part that forms the low rigidity part that forms the low rigidity part between the high rigidity part and the high rigidity part is the arc of the top of the inner blade. Since it is located at or below the center of the inner blade blade or the center of the outer shape of the inner blade blade exposed on the inner blade base, it is possible to form a portion with low rigidity in the inner blade blade in the narrow portion. The shaving noise can be secured even if the inner blade thickness is increased, and while the shaving noise can be secured, the inner blade blade thickness can be increased to reduce the blade edge angle and improve sharpness. It is possible, and because the inner blade is bent in the narrow part, Since the stress does not concentrate on the inner blade base of the product and the inner blade base can be prevented from cracking during grinding, the rigidity is determined by the shape of the narrow part, so the rigidity and natural frequency can be set. It is easy to change the settings, and it is possible to reduce the beard scattering because the opening can be made larger, and furthermore, the opening is provided in the lower part and the large swinging part of the upper part of the inner blade is Since the area is increased, the volume can be increased and the shaving sound can be increased.

According to the second aspect of the present invention, by providing the inner blade with a thin portion having a thin plate thickness, the inner blade has a high rigidity portion in the vertical direction and a high rigidity portion. Form the low rigidity portion located between, the vertical position of the thin portion that forms the low rigidity portion, the center of the arc of the top of the inner blade blade, or the outside of the inner blade blade exposed on the inner blade base Since it includes the center of the shape or is located below it, by forming a part with low rigidity in the inner blade at the thin part, even if the plate thickness of the inner blade other than the thin part is thickened, the shaving noise will be generated. It is possible to secure the shaving sound, while increasing the plate thickness of the inner blade to reduce the blade angle and improve the sharpness,
Also, since the inner blade blade bends at the thin portion, stress does not concentrate on the inner blade base of the molded product, and it is possible to prevent cracking of the inner blade base during grinding, and the rigidity is determined by the shape of the thin portion. Therefore, the rigidity and natural frequency can be easily set or changed, and since the rigidity is determined by the thickness and length of the thin portion, it is not necessary to provide a large opening and the volume is reduced. It can be increased to increase the shaving sound.

According to the third aspect of the present invention, the penetrating portion through which the drive pin provided integrally with the reciprocating drive element passes is provided so as to reach the inside of the inner blade blade on the inner blade base. Therefore, the drive transmission point from the drive pin to the inner blade base can be provided above, and the flapping of the inner blade can be prevented even when the reciprocating speed is increased. It is possible to increase the float amount because a large opening can be provided. Also, there is a concern that the inner blade blade may be held on the inner blade base, but since the load on the inner blade base is reduced as in claims 1 and 2, there is no such concern.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of an embodiment of an inner blade of a reciprocating electric shaver of the present invention, taken along line AA of FIG.

FIG. 2 is a half cross-sectional view of the inner blade body as seen from the front.

FIG. 3 is a half cross-sectional view seen from the front in a state where a driver is attached to the inner blade body of the above.

4 is a cross-sectional view taken along the line BB of FIG.

FIG. 5 is an explanatory view for explaining the operation when a load is applied to the inner blade of the above, (a) shows a conventional example,
(B) shows the present invention.

FIG. 6 is a sectional view showing another embodiment of the above.

FIG. 7 is a sectional view of still another embodiment of the same.

FIG. 8 is a sectional view of still another embodiment of the same.

9A, 9B and 9C are cross-sectional views illustrating a conventional example.

[Explanation of symbols]

 1 Inner Blade Base 2 Inner Blade 5 Opening 6 Narrow Part 7 Thin Part 8 Driver 9 Drive Pin

Claims (3)

[Claims] 1. An inner blade body of a reciprocating electric shaver in which a large number of inner blade blades are arranged in a row in the longitudinal direction of the inner blade base on the inner blade base, and an opening is provided inside the width direction of the inner blade base. By forming a narrow portion with a narrow width in the width direction, a low rigidity portion is formed between the high rigidity portion and the high rigidity portion in the vertical direction of the inner blade, and the low rigidity portion is formed. The vertical position of the narrow portion forming the, including the center of the arc of the top of the inner blade blade, or located below or including the center of the outer shape of the inner blade exposed on the inner blade base. An inner blade of a reciprocating electric razor characterized by being made. 2. An inner blade body of a reciprocating electric shaver in which a large number of inner blade blades are arranged on the inner blade base in a longitudinal direction of the inner blade base. By providing a lower rigidity portion between the high rigidity portion and the high rigidity portion in the vertical direction of the inner blade, the upper and lower positions of the thin portion forming the low rigidity portion An inner blade body of a reciprocating electric shaver, characterized in that it is located at or below the center of the arc of the top of the blade or the center of the outer shape of the inner blade exposed on the inner blade base. 3. A reciprocating driving element is provided with a penetrating portion through which a drive pin integrally provided reaches the inside of the inner blade on the inner blade base, and the inner blade has a plate thickness of 0.1 to 10. 0.
The length is set to 3 mm.
Inner blade of reciprocating electric razor described.