JPS6322834B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a rotary electric shaver.

[Background technology]

In a rotary electric shaver in which the outer blade and the inner blade are in pressure contact with the cutting edge of the inner blade and rotate in sliding contact, we aim to improve ease of assembly and performance by integrally forming a push-up spring that pushes up multiple inner blades. Various such devices have been proposed and are known, for example, from Japanese Utility Model Publication No. 19083/1983, Publication No. 35304/1983, and West German Patent No. 1033090. Of these, Jikko No. 57-19083 (same as Jikko No. 57-35304)
The one shown in Figure 1 has a ring-shaped continuous part on the outer periphery of the inner cutter base, and multiple elastic pieces extending inward from the outer periphery apply upward force to the inner cutter to bring it into close contact with the outer cutter. It's structured well. However, since the point for pushing up the inner cutter can only be set inside the continuous part of the outer ring, the push-up force applied to the outer circumference of the inner cutter and the centrifugal force applied to the inner cutter during rotation cause the outer cutter to In order to bring the inner cutter into close contact with the inner cutter, a push-up force greater than necessary is required, and the space for arranging the inner cutter is generally limited, resulting in poor assembly workability.

On the other hand, West German Patent No. 1033090 provides a ring-shaped continuous part at the innermost circumference, and applies a pushing force to the inner cutter using a plurality of elastic pieces extending outward from the ring-shaped continuous part. However, since the fixing point of the elastic piece is near the center of rotation, the attachment position of the elastic piece and the inner cutter base is likely to shift, resulting in unstable pushing up.

[Purpose of the invention]

The object of this invention is to improve the ease of assembly by integrally forming a push-up spring, to further improve the ease of assembly, to effectively select the push-up point of the inner cutter, and to stabilize the push-up. The purpose of the present invention is to provide a rotary electric razor with excellent cutting ability.

[Disclosure of the invention]

The rotary electric shaver of the present invention includes a push-up spring integrally formed and supported by the inner cutter base.
A first push-up spring extending inwardly from the ring-shaped connecting piece and a second push-up spring extending outward are formed, and the first inner cutter disposed on the inner peripheral side of the outer cutter is connected to the first push-up spring. The second inner cutter disposed on the outer circumferential side of the outer cutter is pushed up by a second push-up spring. In this way, in a rotary electric shaver in which each push-up spring is integrally formed, a ring-shaped connecting piece is provided between the outer circumference push-up spring and the inner circumference push-up spring of the inner blade, so the assembly space is divided. Therefore, it has good workability for assembly and heat caulking. In particular, the push-up point toward the inner cutter on the outer periphery side can be placed freely on the outside of the ring-shaped connecting piece, which effectively prevents gaps between the inner cutter and the outer cutter from occurring due to centrifugal force applied to the inner cutter. It is possible to easily push up at a certain point, and a rotary blade with stable push-up and good cutting quality can be obtained.

A first embodiment of the present invention will be described based on FIGS. 1 to 6. That is, as shown in FIG. 4, the peripheral edge of the outer cutter 2 is fixed to the upper end of the outer cutter frame 1, and is held down by a holding ring 3. Outer blade frame 1
The lower end has a threaded portion 4 and is attached to the razor body (not shown). The outer cutter 2 forms annular recesses 5 and 6 for introducing whiskers, and the cutter holes 7 and 8 of the outer cutter 2 are such that the center cutter hole 7 and the outer circumferential cutter hole 8 are aligned in the radial direction and rotate at a predetermined angle. It is tilted non-linearly and has an inclination angle of θ ₁ between the two. In addition, the inner cutter base 9 has a joint fitting part 9a at the center and is arranged inside the outer cutter 2, and as shown in FIG. 17, and as shown in FIG. 1, the ring-shaped connecting piece 12 engages the positioning hole 13 with the protrusion 14 of the inner cutter base 9 on the lower surface of the inner cutter base 9, and is welded and fixed by heat caulking. A first push-up spring (a plurality of pieces, but it may be one piece) 15 is extended from the inside of the connection piece 12, and a second push-up spring twice as large as the first push-up spring 15 is extended from the outside of the connection piece 12. 16 (single piece, but may be composed of multiple pieces) extend from equally spaced positions on the connecting pieces 12. The tips of each push-up spring 15, 16 are arranged in a line in the radial direction as shown in FIG.
Located in The first and second inner cutters 18 and 19 are passed through the slits 10 and 11, and the lower end support portions 20 of the inner cutters 18 and 19 are engaged with the tips of the push-up springs 15 and 16, and the push-up springs 15 and 16 push the inner cutters 18 and 19 inside. Blade 18, 19
is supported. The inner cutters 18 and 19 are inclined non-linearly in the direction of rotation with a predetermined scissor angle corresponding to the inclination of the cutter holes 7 and 8 of the outer cutter 2, and their mutual intersection angle is θ ₂ (θ ₂ ≠θ ₂ ).

By connecting the joint fitting part 9a of the inner cutter base 9 to the motor shaft and operating the motor, the inner cutter base 9 rotates, and the inner cutters 18 and 19 slide on the outer cutter 2 to open the cutter hole. Shave the ingrown hair from 7 and 8.

Because of this configuration, this rotary electric shaver has the following effects. That is, (1) the first portion extending from the inside of the ring-shaped connecting piece 12;
By providing the push-up spring 15 and the second push-up spring 16 extending from the outside of the connecting piece 12,
The ring-shaped connecting piece 12 allows the points of the pushing up force of each pushing up spring 15, 16 to be adjusted without affecting each other.
Since the springs 15 and 16 can be separated from each other and any extension position can be selected, an effective push-up force can be distributed to the push-up springs 15 and 16. In particular, the inner cutter 19 on the outer peripheral side
This problem can easily be improved because the inner cutter 19 is tilted due to the centrifugal force applied to the inner cutter 19, and a gap is likely to occur between the inner cutter 19 and the outer cutter 2 on the outer circumferential side, resulting in poor cutting quality. In addition, since the push-up springs 15 and 16 are fixed to the connecting piece 12 of the inner cutter base 9, the position for heat caulking etc. can be made in the middle part of the inner cutter base 9, so there is plenty of space for the heat caulking jig and assembly. It becomes easy.

(2) The push-up spring 16 of the inner cutter 19 on the outer periphery
The number of sheets is larger than the inner inner cutter 18, and the inner inner cutter 1
In the case of an integral multiple of 8, it is possible to provide a well-balanced spring property for obtaining a pushing force at equally divided positions of the connecting piece 12, thereby making it easy to assemble.

(3) By arranging the tips of the push-up springs 15, 16 on a straight line in the radial direction, the formation can be simplified, and the push-up springs 15, 16 and the connecting piece 12 can be easily manufactured and assembled.

(4) A line connecting the cut hole 7 in the central area of the outer cutter 2 and the cut hole 8 in the outer peripheral area of the outer cutter 2 in the radial direction of the outer cutter 2 intersects at an intersection angle θ ₁ , and the outer circumference of the outer cutter 2 The first inner cutter 19 in sliding contact with the area and the second inner cutter 18 in sliding contact with the center area of the outer cutter 2 are made to correspond to the outer cutter 2 in the outer peripheral area and the central area as shown in FIG. 5 at an intersection angle of θ _2. The first and second inner cutters 18 and 19 are tilted so as to intersect, and are pushed up by push-up springs attached to the inner cutter base 9 and slid onto the outer cutter 2.
With this configuration, an appropriate scissor angle can always be freely selected in both the central region and the outer peripheral region of the outer cutter 2, and sometimes the outer peripheral part of the outer cutter 2 has a cutting hole 8 in order to improve the introduction of hairs coming in from the outer edge. Even if it is oriented in the radial direction, the moderate inclination on the inner blade side allows for a suitable scissor angle, allowing for smooth shaving. In addition, the blade hole 8 in the outer peripheral area is sloped to have an appropriate scissor angle,
In some cases, the inner cutter 19 is made single without intersecting, but in this case, for example, when the outer cutter 2 is drawn into a spherical surface, the cutter hole 8 is plastically deformed in the circumferential direction, so the inclination angle changes. Since the amount of change differs depending on the location of the direction, the change in the outer cutter hole 8 may be smaller if the inner cutter 19 is inclined rather than the outer cutter hole 8 as in the present invention. From the above, in the outer cutter 2, the introduction of hair especially in the outer peripheral area is improved. The inner blades 7 and 8 have appropriate cutting angles in each area, so they have good cutting ability and are effective in shaving hair smoothly. Regarding this point, conventionally, the central area of the outer cutter and the cutter hole in the outer circumferential area are separated and lines connected in the radial direction of the outer cutter are crossed at a predetermined angle, and the cutter holes in the outer circumferential area are oriented in the radial direction. There were some attempts to improve the introduction of the bristles, but because the inner blade was formed as a single piece and oriented radially at a certain angle (including 0°), The inner blade has a different scissor angle with respect to the blade hole.
Therefore, if you try to match one of them, the other scissor angle will become incompatible, resulting in the disadvantage that you will not be able to shave your beard smoothly.

(5) The rib 17 of the inner cutter base 9 is provided between the inner cutters 18 and 19 arranged in the radial direction, so that the inner cutters 18 and 19 are completely independently supported by the push-up springs 7 and 8. Therefore, when the inner cutter base 9 is rotated, the inner cutters 18 and 19 try to rotate around their centers of gravity due to centrifugal force, but the length of the cutting blades of the inner cutters 18 and 19 is relatively short, and the rib 17 Because they are independent through the outer cutter 2, they do not interfere with each other, and rotate while being in close contact with each other within the sliding contact range of the outer circumferential part and the inner circumferential part of the outer cutter 2 without creating a large gap in the outer circumferential part. Therefore, the cutting quality during rotation is improved.
In this way, the inner cutters 18, 19 and the outer cutter 2 are always in good contact regardless of the centrifugal force during rotation, so a very good cutting quality can be obtained even when rotating at high speed, and this is especially noticeable at the outer periphery of the outer cutter. There is an effect.

Regarding this point, there is a conventional one in which a first inner blade that slides on the outer periphery of the outer cutter and a second inner blade that slides on the outer periphery of the outer cutter are arranged in the radial direction of the outer cutter. No rib is provided between the first and second inner cutter blades. Therefore, when rotating, even if each inner blade tries to fall toward the outer circumference due to centrifugal force around the center of gravity, the amount of fall (even the angle of fall) of the first and second inner blades will be lower. If the first inner blade falls down a lot and the second blade falls down only a little, a gap will occur between each blade and the hair cannot be cut in the important zone in the middle of the outer blade. portion occurs. On the other hand, if the first inner blade falls down a little and the second inner blade falls down a lot, the second inner blade will always collide with the first inner blade during rotation, and therefore each inner blade will fall down. As the blade tries to move downward, it loses contact with the outer cutter, resulting in poor cutting quality and noise. Note that there is one in which the first inner blade and the second inner blade are integrated. In this case, the total length of the inner blade becomes longer, so if the inner blade falls around the center of gravity due to centrifugal force during rotation, the center of the outer blade will try to adhere more tightly due to the characteristics of the rotational moment force, but the outer periphery will Since the inner blade moves in the direction where a gap is generated, a gap is generated at the outer periphery, resulting in poor cutting quality.

A second embodiment of the invention is shown in FIGS. 7 and 8. That is, in the first embodiment, the number of positioning holes 13a of the connecting piece 12a is reduced to improve the workability of attaching the connecting piece 12a such as heat caulking.

A third embodiment of the invention is shown in FIG. That is, an integrated inner cutter 21 is used instead of the inner cutters 18 and 19, and the other configurations are the same as in the first embodiment.

A fourth embodiment of the invention is shown in FIGS. 10 and 1.
Shown in Figure 1. In other words, the positioning hole 2 for heat caulking
The ring-shaped connecting piece 22 with a
A push-up spring 15' is arranged on the inside of the outer-periphery connection part 24, and a push-up spring 16' is arranged on the outside of the outer-periphery connection part 24. 'a, 16'a are formed. In this case as well, the same effects as in the first embodiment can be obtained.

FIGS. 12 and 13 show a modification thereof in which the number of positioning holes 25a of the connecting piece 22a is reduced, and correspond to the second embodiment.

The fifth embodiment of this invention is shown in FIGS. 14 and 1.
It is shown in Figure 5. That is, the tips of the push-up springs 15 and 16 are arranged in a straight line in the radial direction, and the inner cutters 18' and
19' are arranged linearly in the radial direction. The rest is the same as the first embodiment.

〔Effect of the invention〕

According to this invention, it is possible to improve the ease of assembling the inner cutter, to effectively select the push-up point of the push-up spring, to stabilize the push-up, and to improve the cutting quality.

[Brief explanation of the drawing]

Fig. 1 is a back view of the inner cutter base in the first embodiment of the invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view, and Fig. 4 is a half-sectional side view of the blade of the electric shaver. , Fig. 5 is a plan view of the outer cutter, Fig. 6 is a plan view of the ring-shaped connecting piece and the push-up spring, Fig. 7 is a back view of the inner cutter base of the second embodiment, and Fig. 8 is a plan view of the ring-shaped connecting piece and the push-up spring. FIG. 9 is a plan view of the connecting piece and the push-up spring; FIG. 9 is a half-sectional side view of the electric shaver blade of the third embodiment; FIG.
The figure is a back view of the inner cutter base of the fourth embodiment, FIG. 11 is a plan view of its ring-shaped connecting piece, FIG. 12 is a back view of the inner cutter base of a modified example, and FIG. 13 is its ring. FIG. 14 is a plan view of the inner cutter base of the fifth embodiment, and FIG. 15 is a sectional view thereof. 2...Outer cutter, 7, 8...Blade hole, 9...Inner cutter base, 1
0, 11...Slit, 12, 12a, 22, 22
a...Ring-shaped connecting piece, 15, 15', 16, 1
6'... Push-up spring, 17... Rib, 18, 19, 1
8', 19', 21...Inner cutter, _θ1 , _θ2 ...Intersection angle.

Claims (1)

[Scope of Claims] 1. An inner cutter base, a ring-shaped connecting piece attached to the lower surface of the inner cutter base, and first and second connecting pieces extending inwardly and outwardly from the ring-shaped connecting piece, respectively. a push-up spring; and first and second inner cutters that are passed through slits formed in the inner cutter base and whose lower ends are supported by the tips of the first and second push-up springs. Rotary electric razor. 2 The tips of the first and second push-up springs are aligned in the radial direction of the inner cutter base, and
The rotary electric shaver according to claim 1, wherein the second inner cutters are linearly arranged in the radial direction. 3 The tips of the first and second push-up springs are arranged in a line in the radial direction of the inner cutter base, and the first and second inner cutters are arranged in a rotational direction so as to be non-linear with respect to each other. The rotary electric shaver according to claim 1, wherein the electric shaver is arranged at an angle. 4 The non-circular outer cutter hole corresponding to the first inner cutter and the non-circular outer cutter hole corresponding to the second inner cutter are tilted in the direction of rotation at a predetermined scissor angle corresponding to the inclination of the inner cutter. A rotary electric shaver according to claim 3. 5. Among the first and second inner blades, those located on the outer peripheral side have an integral multiple of the number of blades than those on the inner peripheral side,
2. The rotary electric shaver according to claim 1, wherein said ring-shaped connecting pieces are evenly arranged.