JP2652363B2 - Rotary electric razor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a rotary electric shaver and relates to an improvement in a holding structure of an inner cutter and an outer cutter.

[0002]

2. Description of the Related Art As a rotary electric shaver, there is, for example, one shown in FIGS. There, in the main body case, a cylindrical inner blade 6
Are bearing bosses 20 facing left and right of the inner blade support frame 15.
The outer cutter 4 is supported so as to rotate in a fixed direction with the inner cutter drive shaft 14 between the outer cutters 20, while the outer cutter 4 is curved over the upper peripheral surface of the inner cutter 6 via the outer cutter holder 5 on the upper part of the main body case. It is stretched.

[0003]

The problem is that, despite the fact that the cutting edge 6a of the inner cutter 6 is cut to the end face in the axial direction, the left and right ends 4a. 4a
However, the point is that it is not fixed to the outer cutter holder 5 but is provided in a state of being raised from the upper end of the bearing boss 20 of the inner cutter support frame 15.

The end 4a of the outer blade 4 projecting above the bearing boss 20 is depressed during shaving when it is pushed inward by the skin pressure W as shown by a two-dot chain line B in FIG. The outer blade 4 is scratched at the edge of the end face of the inner blade 6, or the outer blade 4 is locally lifted from the inner blade 6 at another location under the influence of the deformation at that location. Sometimes the sharpness deteriorated. In particular, in the case where the inner cutter 4 is fixed without moving up and down with respect to the main body, the tearing phenomenon of the outer cutter 4 due to the edge of the end face of the inner cutter 6 occurs remarkably.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem. In a rotary electric shaver in which a cylinder-type inner blade is rotatably supported between opposed bearing bosses as described above, an outer shaft is provided. By devising how to prepare the bearing bosses at both ends of the blade and the support structure for the inner and outer blades, the friction resistance between the outer blade and the inner blade is reduced, the sharpness is improved, and the durability of the outer blade is improved. The purpose is to improve the quality.

[0006]

In order to achieve the above object, in a rotary electric shaver of the present invention, a bearing boss 20 provided at the left and right upper ends of an inner blade support frame 15 in a main body case 1 is provided. In addition, a cylindrical inner cutter 6 is rotatably supported via an inner cutter drive shaft 14, and the outer cutter 4 moves up and down in an inverted U-shape with respect to the outer cutter holder 5 mounted on the main body case 1. In the rotary electric shaver, which is supported and stretched so as to be wound around the upper part of the peripheral surface of the inner cutter 6, the inner cutter support frame 15 is provided.
Is supported so as to be vertically movable with respect to the main body case 1 and always urged to the outer blade side. The left and right end surfaces of the inner blade 6 are in close contact with the inner walls of the left and right bearing bosses 20. And the upper half 20 a of the peripheral surface of the bearing boss 20.
Is formed in a semicircular shape along the outer diameter of the inner cutter 6, and the height of the top of the upper half 20 a of the peripheral surface of the bearing boss 20 is substantially equal to the height position of the upper part of the peripheral surface of the inner cutter 6. The inner cutter 4 is slid in contact with the bristle introduction hole 8 region of the central portion 4b of the curved portion of the outer cutter 4, and the inner surfaces of the left and right ends 4a and 4a of the bristle non-introduction region are the bearing bosses. 20 ・ 20 Upper half of peripheral surface 2
0a and 20a.

[0007]

[Operation] The outer diameter of the inner cutter 6 and the upper half portion 20 of the peripheral surface of the bearing boss 20
a is the same diameter and the same height, and both ends of the inner cutter 6 and both bearing bosses 20 are arranged in close contact with each other, so that the upper half 20a of the inner peripheral surface of the inner cutter 6 and the bearing boss 20 is formed. Are integrated in a semi-circular shape in a pseudo-continuous manner. Further, the outer cutter 4 is connected to the region where the hair introduction holes 8 are formed in the central portion 4 b by the inner cutter 6.
And both ends 4a, 4a are brought into contact with the bearing boss 20.
The outer peripheral surface of the inner boss 6 supporting the inner surface of the outer blade and the bearing bosses 20 and 20 even when receiving the pressing force from the skin against the outer blade by receiving and supporting the upper blade 20a at the upper peripheral portion 20a. Since the halves and the semi-circular shape are quasi-continuously integrated into a semicircular shape, the inner blade 6
The edges of both ends are flush with the bearing boss 20 and are substantially eliminated, so that it is possible to prevent the outer blade from being damaged by the both edges of the inner blade.

In particular, the outer blade 4, which is supported so as to be movable up and down, extends over substantially the entire length thereof, and the upper end of the inner blade support frame 15 which is also movably moved up and down with respect to the main body case 1 and is urged upward. Are received by the bearing bosses 20 and 20 and the inner blade 6 supported by the bearing bosses.
In addition, since the bearing bosses 20 and 20 move downward and follow the spring pressure as a unit, a clearance is hardly generated between the outer cutter 4 and the inner cutter 6, and the sharpness does not deteriorate and the skin is good. It is familiar.

Further, the inner cutter 4 is slid in contact with the bristle introduction hole 8 formed in the central portion 4b of the outer cutter 4, so that the upper half portions 20a of the bearing bosses 20 are fixed to the outer portions. Since it is configured to receive the inner surface of the non-introduction area of the hairs at the left and right ends 4a of the blade 4, the beard introduced from the hair introduction hole 8 is surely cut by the corresponding inner blade 4,
Since the whiskers cannot be introduced from the left and right ends 4a of the outer blades corresponding to the bearing bosses 20 which receive and support the outer blades 4, the whiskers may be caught between the outer blades and the bearing bosses 20 and pulled. There is no one.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a rotary electric shaver according to the present invention will be described with reference to FIGS. In FIG. 1, a circuit board 2 and rechargeable batteries 3 are incorporated in a lower half portion of the main body case 1. An outer cutter 4 is mounted on the upper part of the main body case 1 by being bent into an inverted U-shape via an outer cutter holder 5, and a cylindrical inner cutter 6 is mounted on the upper half of the main body case 1 by a horizontal shaft. Inner blade unit 7 supported
Are movably up and down and are urged upward.

In FIG. 1 and FIG.
Is formed such that a square outer holder 5b is detachably mounted on the outside of a square cylindrical inner holder 5a. As shown in FIG. 4, the outer cutter 4 has a substantially central portion 4 in the front-rear direction.
b is formed in a mesh shape with a large number of shear introduction holes 8 as opening areas. The outer blade 4 bends its mesh portion in an inverted U-shape to expose the upper surface openings of the inner and outer holders 5a and 5b, and has front and rear ends thereof at the inner and outer holders 5a and 5b.
By being sandwiched between the mating surfaces b, it is held by the outer blade holder 5. In this case, the outer blade 4 is attached to the front wall of the inner holder 5a.
Of the outer blade 4 is connected to a support plate 10 attached to a rear wall portion of the inner holder 5a via a spring 11 so that the outer blade 4 is Blade 6
Thus, the outer cutter 4 is wound around the upper part of the inner cutter 6 with an appropriate tension via the outer cutter holder 5 on the upper part of the main body case 1.

In FIG. 1, the outer blade holder 5 is supported by an engaging claw 12a provided at the upper right side of the main body case 1 with the right wall of the inner holder 5a. The left wall portion of the holder 5a is engaged and supported by a locking claw 12b with a knob attached to the upper left end of the main body case 1. Therefore, when the locking claw with knob 12b on the left side is pushed in against the spring 13, the outer blade holder 5 can be removed from the main body case 1 together with the outer blade 4.

In FIG. 1, an inner cutter unit 7 includes a cylindrical inner cutter 6, a pair of left and right inner cutter support frames 15 for horizontally supporting the inner cutter 6 via an inner cutter drive shaft 14, and the frame. A motor 16 mounted on the motor 15 and a transmission mechanism 17 of a gear group for transmitting a motor output to the inner blade drive shaft 14. The inner blade unit 7 includes a pair of left and right support members 1 fixed in the main body case 1 so as to be elastically deformable in the vertical direction.
8 and 18 so as to be able to move up and down.
And is constantly pushed up toward the outer blade side.

The cylinder-type inner blade 6 has a plurality of cutting blades 6a formed integrally on the outer peripheral surface of the cylinder in a spiral shape in the axial direction. The space between 6a is filled with the filler 6b to form a true cylinder with no cutting edge. Bearing bosses 20 that rotatably support the inner blade drive shaft 14 are provided at upper ends of the left and right inner blade support frames 15. The bearing boss 20 has an upper half portion 20a of a semicircular shape drawn with the same diameter as the outer diameter of the inner cutter 6 and a height of the top of the upper half portion 20a of the inner cutter 6. The height is set to be equal to the height of the upper part of the peripheral surface. Then, the outer cutter 4 aligns the left and right ends 4a, 4a of the curved portion wound around the inner cutter 6 along the upper halves 20a, 20a of the bearing bosses 20, 20.
Take it on 0. The left and right ends 4a of the outer blade 4 correspond to the upper half portions 20a of the peripheral surface of the bearing bosses 20.
Is formed as a non-hair introduction area without forming the hair introduction hole 8.

The outer blades 4 received on the upper halves 20a of the bearing bosses 20 are bent and stretched so that the inner blades 6 are wound around the outer blades 4. Without being deformed into a polygonal cross-sectional shape, the curved portion is maintained in a semicircular cross-sectional shape having the same diameter as the outer diameter of the inner cutter 6 over the entire axial length of the curved portion. Therefore, the inner cutter 6 rotates with less frictional resistance against the inner surface of the curved portion of the outer cutter 4.

As shown in FIG. 4, long slits 21 are formed in the left and right ends 4a of the outer cutter 4 in the circumferential direction thereof, and project from the upper half 20a of the peripheral surface of the bearing boss 20. The part 22 is engaged with the slit 21 to allow a constant movement in the circumferential direction due to the tension of the spring 13 of the outer blade 4, but restricts the outer blade 4 from moving in the left-right direction, The relationship between the inner and outer blades is well and stably maintained.

[0017]

[Other Embodiment] As in the above embodiment, the cylindrical inner cutter 6 is formed into a true cylinder without cutting edges by filling the space between the cutting edges 6a with the filler 6b only at both axial ends. Thus, the polygonal deformation of the outer cutter 4 can be prevented more reliably. However, it is not necessary to form the inner cutter 6 in such a shape, and the cutting blade 6a is provided on the cylinder peripheral surface at the axial end face. It may be cut down to the end. Further, the inner cutter 6 may be provided with a separate cutting blade on the peripheral surface of the cylinder. The cutting blade 6a may be not only a helical shape but also a straight blade parallel to the rotation axis direction.

[0018]

According to the present invention configured as described above,
The outer blade can be effectively prevented from being damaged by the edges of both ends of the inner blade 6, and the inner blade 6 and the bearing bosses 20 are integrally lowered even when the outer blade moves downward due to pressure from the skin during shaving. It moves and satisfactorily follows and adapts to the skin, and it is unlikely that a gap or the like is formed between the outer and inner blades, and the sharpness is not reduced. Further, since the bristle introduction holes 8 are not formed in the left and right end portions 4a of the outer blade 4 received and supported by the bearing bosses 20, the whiskers may be introduced from this portion to cause pulling. Nor.

[Brief description of the drawings]

FIG. 1 is an overall longitudinal sectional front view of a rotary electric shaver according to the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an exploded perspective view of an outer blade, an inner blade, and an inner blade support frame.

FIG. 5 is a longitudinal sectional side view of a main part of a conventional technique.

FIG. 6 is a vertical sectional side view of a main part of the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 4 Outer blade 5 Outer blade holder 6 Inner blade 14 Inner blade drive shaft 15 Inner blade support frame 20 Bearing boss

Claims (1)

(57) [Claims] In the main body case, a cylindrical inner blade is rotatably supported via an inner blade drive shaft between bearing bosses provided on the left and right upper ends of an inner blade support frame in the main body case. The outer cutter 4 is supported and stretched in an inverted U-shape and vertically movably with respect to an outer cutter holder 5 mounted on the main body case 1 so as to be wound around the upper part of the peripheral surface of the inner cutter 6. In the supported rotary electric shaver, the inner blade support frame 15 is supported so as to be vertically movable with respect to the main body case 1 and always urged to the outer blade side. The left and right end faces are arranged in close contact with the respective inner walls of the left and right bearing bosses 20. The upper half 20 a of the peripheral surface of the bearing boss 20 is formed in a semicircular arc shape along the outer diameter of the inner cutter 6. The top of the upper half portion 20a of the peripheral surface of the bearing boss 20 The height of the inner blade 4 substantially coincides with the height of the upper part of the peripheral surface of the inner cutter 6, and the inner cutter 4 is slid in contact with the hair introduction hole 8 in the central portion 4b of the curved portion of the outer cutter 4. With the left and right ends 4a
A rotary electric shaver characterized in that the inner surface of the bristle non-introduction region is received by upper half portions 20a of the peripheral surfaces of the bearing bosses 20.