JPS63255090A - Inner blade of rotary electric razor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an inner blade of a rotary electric razor.

(Background Art) Conventionally, an outer blade has a plurality of inner blades in which an inner blade push-up spring and an inner cutter blade are integrally formed and is attached to an inner cutter base via the inner cutter push-up spring, and has a large number of hair introduction holes. In a rotary electric shaver that slides, the inner blades are supported by the arms of the inner blade push-up springs so that a large number of the inner blades can evenly contact the outer blades. When looking at the flatness of the upper ends of many inner cutter blades, unevenness inevitably occurs during manufacturing. Therefore,
In order to make all of the many inner blades come into uniform contact with the outer cutter and improve their sliding contact with the outer cutter (reducing the gap), the spring constant of the arm of the inner cutter push-up spring should be reduced and the amount of deflection should be increased. (for example, 0.2 to 0.31), and for this reason, in the inner blade of conventional rotary electric shavers, the thickness of the inner blade material is thinner (0.1 to 0.5). There is.

Therefore, in the case where the inner blade part and the arm of the inner blade push-up spring are integrally formed, the blade part is not thin like the inner blade push-up spring, and the rigidity is weak and the cutting ability is reduced.
There is a problem in that it is not possible to shave a thick beard sharply all at once.

Also, in order to increase the cutting ability, if the plate thickness is increased,
The inner cutter on the outer periphery must be close to a rigid blade without an inner cutter push-up spring, and if the accuracy of the flatness of the inner and outer cutter surfaces is not improved, a gap will occur between the outer and inner cutters. However, the disadvantage was that the cutting quality deteriorated.

In addition, in order to reduce the above-mentioned gap and improve cutting quality, the arm of the inner blade push-up spring and the inner blade blade part are separated.
Some models have the arm of the inner blade push-up spring thinner to ensure sufficient deflection, and the inner blade blade thicker to ensure cutting ability, but this requires multiple blades. , the number of parts including the inner blade push-up spring increases,
Cost increases. Furthermore, the attachment part between the inner blade blade and the arm of the inner blade push-up spring is subject to wear as both members slide, and because the plate thickness of the arm of the inner cutter push-up spring is thin, there is a risk of damage after long-term use. There was also.

(Object of the Invention) The present invention was proposed in order to solve the above-mentioned problems, and by supporting a plurality of blades as a set with one arm, the arm of the outer peripheral inner blade push-up spring is To provide an inner blade of a rotary electric shaver which is easily deflectable and has improved durability and sharpness by increasing the plate thickness of the arm of the spring for pushing up the outer periphery of the inner blade.

(Disclosure of invention) Embodiments of the present invention will be described below with reference to the drawings.

Figures 1(a) to 2) and 2(a) to 2(c) show the first embodiment of the present invention, and Figure 1(a) is a top view of the rotary electric shaver; Figure (b) is a sectional view taken along line X-X in figure (a), figure (c) is a top view of the inner blade, and figure (b) is a bottom view of the inner blade. First, in Figures 1 (a) and (b), l is the outer blade, 2
1 is an outer cutter frame, and the outer cutter 1 is housed inside the outer cutter frame 2, and an elastic arm 7 applies a biasing force to the outer cutter in the vertical direction. 3 is an inner cutter base, and this inner cutter base 3
Two types of inner cutters are installed: an inner inner cutter 4 and an outer inner cutter 5 (the inner cutter and the outer inner cutter are collectively referred to as the inner cutter).

6 is a center pin located in the cylindrical portion 1a near the center of the outer cutter 1.
It works to reinforce the radial stiffness of.

The outer cutter 1 is fitted with the inner cutter base 3 at this cylindrical portion 1a, and the center of the outer cutter 1 and the center of the inner cutter 4.5 are positioned. 8 is a joint for giving rotational motion to the inner cutter 4.5, and is a drive l! Play with 110. Also, on the upper surface of the drive ring 10 and inside the joint 8, there is a push-up spring 9 for the inner cutter base.
is included. Reference numeral 13 denotes a rotating shaft of the motor, to which a pinion 12 is connected, this -nion 12 meshes with a gear 11, and the shaft of this gear 11 is connected to a drive ring 10. 1
4 indicates a waterproof packing. Further, 15 is a spring for pushing up the inner cutter on the outer periphery.

Next, FIG. 1(C) is a top view of the inner cutter, and the inner cutter arm 17 is arranged in a direction from the center to the outer circumferential direction.
is extended, and the inner cutter arm 17 is bent and extended to ensure the length. In addition, the inner periphery inner blade push-up spring 16
is fixed to the inner cutter base 3 by a heat seal portion 18.

An inner inner cutter 4 is attached to the tip of this inner inner cutter arm.

In addition, Fig. 1) is a bottom view of the inner cutter, and the shaft of the inner cutter base 3 is inserted into the center of the push-up spring support portion 19 whose center portion is approximately circular in the outer peripheral inner cutter push-up spring 15. A hole 20 is provided, and an outer inner cutter arm 2 is provided along the outer circumference of the push-up spring support portion 19.
1 is extended, and at the tip of the outer peripheral inner cutter arm 2 is an inner cutter blade attachment part 23 that connects a plurality of inner cutter blades 22.
are formed, the push-up spring support part 19, the outer inner cutter arm 21
, the inner cutter attachment portion 23 and the inner cutter blade 22 are integrally formed of the same material.

The outer inner cutter is connected so that a plurality of outer inner cutter blades 22 (three inner cutter blades in the figure) are connected by the inner cutter blade attachment part 23 and supported by a push-up spring 150 and one outer inner cutter arm 21. In addition, the inner cutter is formed integrally with the outer circumferential inner cutter arm 21 and is constructed in a partially independent suspension system. In this outer circumferential inner cutter, one outer circumferential inner cutter arm 21 of the push-up spring 15 is not subjected to the push-up blades (load) of a plurality of outer circumferential inner cutter blades 22 (in the figure, a conventional completely independent suspension system inner cutter is used). Even if the spring constant of the outer circumferential inner cutter arm 21 of the push-up spring 15 increases, the amount of deflection can be ensured, and the plate thickness can be reduced accordingly. Because it can be made thicker, the cutting ability can be increased and thick hair can be shaved at once. Even if the blade surfaces of the outer and inner blades are not flat, the gap between the inner and outer blades can be reduced, resulting in a sharp cut. You can shave. Furthermore, since the outer inner cutter blade 22 and the outer inner cutter arm 21 of the push-up spring 15 are integrally formed,
Can reduce costs.

Furthermore, FIG. 2(a) is a sectional view taken along the line A-A in FIG. 1, FIG. 2(b) is a view taken along arrow B, and FIG.

In Figure (a), an outer circumferential inner blade 22 is formed at the tip of the push-up spring 15, and a stopper 24 for preventing the outer circumferential inner blade 22 from tipping over is provided on the rear side with respect to the rotating direction of the outer circumferential inner blade 22. Reference numeral 25 denotes an inner cutting blade.

In addition, in Figures (B) and (C), the outer peripheral inner blade 2
2, a protrusion 26 of the stopper 24 that contacts the inner cutter base 3;
By providing this, it is possible to prevent the deformation of the outer peripheral inner cutter arm 21 of the lower push-up spring 15 toward the outer blade side, reduce the variation in the push-up blade of each outer peripheral inner cutter blade 22, and improve the cutting quality. Can be done evenly.

In this structure, the outer peripheral inner blade 22 and the push-up spring 15
Since the outer peripheral inner cutter arm 21 is integrally formed,
The outer inner cutter blade 22 does not fall toward the outer periphery due to rotational centrifugal force of the inner cutter block, and there is no need for a side wall in the outer circumferential direction of the outer inner cutter blade 22 on the inner cutter base 3, and the outer diameter of the inner cutter base 3 is the same. It can be made smaller. Further, a stopper for preventing the outer inner cutter blade 22 from falling in the rotational direction is provided on the outer periphery of the inner cutter base 3 to prevent the outer inner cutter 5 from falling when cutting beards. The outer circumference inner cutter blade 22 is provided with a guide to prevent the outer circumference inner cutter blade 22 from falling into the cutter hole of the outer cutter 1 and damage the rim of the outer cutter 1. .

In this example, inner blades and outer blades are installed.
Of course, it is also possible to arrange only the outer solade.

By integrally forming the outer inner cutter blade 22 and the outer inner cutter arm 21 of the push-up spring 15, a stop horn 9- for preventing the outer circumference inner cutter blade from falling, which protrudes from the outer periphery of the inner cutter base 3, is formed. There is no need for a side wall of the inner cutter base 3 in the outer circumferential direction of the outer inner cutter blade 22, and the outer diameter of the inner cutter base 3 can be reduced, and the whole machine can be made smaller.

FIG. 3 is a bottom view of the inner blade showing the second embodiment of the present invention.
In the figure, a plurality of second arms 29 each independently support a plurality of outer circumference inner cutter blades 22 between a push-up spring r, a first arm 28, and a plurality of outer circumference inner cutter blades 22.
By forming , it is possible to prevent the simultaneous deflection of the plurality of outer inner cutter blades 22 supported by the outer inner cutter arm 21 of the push-up spring 15 in FIG. 22 deflection to a certain extent (for example, 0
．． 05 to 0.15 m) and the total deflection with the first arm (for example, 0.2 to 0.3 m). It is possible to prevent the generation of gaps between the two outer circumference inner cutter blades 22 and the outer cutter 1, eliminate the gaps between the outer circumference inner cutter blades 22 and the outer cutter 1, and further improve the cutting quality.

FIG. 4 is a bottom view of the inner blade showing the third embodiment of the present invention.
In the figure, in order to equalize the push-up edges of the respective outer circumferential inner blades 22 and to equalize the sharpness of the respective outer circumferential inner cutter blades 22, the first
The arm joint and the second arm 31 are formed to extend in a dogleg shape, and the adjacent first arm 30 and second arm 31 are connected by a first and second arm connecting portion 32, and a plurality of the second of
The arms 31 have the same shape. By dividing the first arm 30 into a plurality of spring parts and providing a connecting part 32 for connecting them, it is possible to make the pushing edges of the outer peripheral inner cutter blade 22 substantially uniform.

Furthermore, Fig. 5 and Fig. 6 (A) and (B) are views showing the fourth embodiment, Fig. 5 is a bottom view of the inner blade, and Fig. 6 @) is A-A in Fig. 5. A sectional view of the same figure (b) is a BB sectional view of the same.

In this fourth embodiment, the arm of the push-up spring and the inner cutter blade are formed separately. In the figure, the outer circumference inner cutter blade 22 connects a guide 33 for preventing the outer circumference inner cutter blade 22 from falling into the outer cutter 1, an inner cutter edge portion of the outer circumference inner cutter blade 22, and a second arm 34 of the push-up spring. The connecting plate 35 is integrally formed in the rotation direction. In this blade, a load F is applied to the tip of the cutting edge of the outer circumferential inner blade 22 as a load for cutting whiskers, but the cutting edge hits the tip of the tip 9- to prevent falling at point 36, and the connecting plate 3 at the rear of the guide.
5 is formed integrally with F in the direction of rotation, so the cutting edge part is not easily bent and has strong rigidity, and has a large cutting capacity and the guide height can be secured without the guide rising upward, preventing it from falling. The effect can be fully demonstrated.

(Effects of the Invention) As explained above, according to the present invention, in the inner cutter of a rotary electric shaver in which the inner cutter blade is supported on the inner cutter base via the push-up spring, the push-up spring supports the inner cutter base. By providing a plurality of inner blade attachment parts at the tip of the arm extending from the arm, and by attaching the inner blade to the attachment parts, and by dividing the arm, the following effects are achieved.

@) By using a partially independent suspension type inner blade, the thickness of the inner blade arm on the outer periphery can be increased, increasing rigidity and increasing cutting capacity. Further, the amount of deflection of the outer peripheral inner cutter arm can be increased, and even if the flatness of the blade surfaces of the outer cutter and inner cutter is poor, the gap can be reduced and cutting quality can be improved.

(b) By providing the second arm, even if the flatness of the blade surfaces of the outer cutter and inner cutter is poor, it is possible to eliminate the gap between the inner cutter and the outer cutter, further improving the cutting quality. .

(c) By dividing and connecting the first arm, the length of each inner blade, that is, the spring constant, can be made uniform, and the cutting quality of each inner blade can be made uniform.

(b) By providing the stroke horn 9 on the inner blade, it is possible to prevent deformation of the inner blade, reduce variations in the push-up blade, and make the cutting quality uniform.

[Brief explanation of the drawing]

Figure 1 (a) to d) and Figure 2 (a) to c) are diagrams showing the first embodiment of the present invention, and Figure 1 0) is a top view of the rotary electric shaver; Figure (B) is a sectional view taken along line XX in Figure (A), Figure (C) is a top view of the inner blade, Figure 2 (A) is a bottom view of the inner blade, Figure 2 (A) is Figure 1 ( (c) is a sectional view taken along the line A-A in FIG. 4 is a bottom view of the inner blade showing the third embodiment of the present invention, FIG. 5 is a bottom view of the inner blade showing the fourth embodiment of the present invention,
FIG. 6(a) is a sectional view taken along line AA in FIG. 5, and FIG. 6(b) is a sectional view taken along line BB in the same figure. 15... Push-up spring, 19... Push-up spring support part, 21
... Outer station inner blade arm, 22 ... Inner blade blade, 23
...Inner blade attachment part. Part 2'tA (a) (b) (c) Figure 5 (a) (b) Procedural amendment - m<method) May 26, 1988

Claims (5)

[Claims] (1) In the inner blade of a rotary electric shaver in which the inner blade is supported on the inner cutter base via a push-up spring, the push-up spring is attached to the tip of the arm extending from the support part to the inner cutter base. An inner blade for a rotary electric shaver, comprising a plurality of blade attachment parts, and an inner blade attached to the attachment parts. (2) The inner cutter of a rotary electric shaver according to claim 1, wherein the inner cutter blade mounting portion includes a plurality of second arms that independently support the inner cutter blades. (3) The inner cutter of a rotary electric shaver according to claim 2, wherein the plurality of second arms are formed to have substantially the same shape. (4) The inner cutter of a rotary electric shaver according to claim 1, wherein the inner cutter blade is provided with a protrusion of a stopper that contacts the inner cutter base. (5) The inner blade of a rotary electric shaver according to claim 1, wherein the arm extending from the push-up spring support portion and the inner blade are integrally formed of the same material.