JPH05200166A - Reciprocating electric razor - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to prevent the structure for rocking the cutter head from interfering with shaving, and to improve the followability of the head to the skin accompanying the rocking of the cutter head. To get a reciprocating electric razor that can. [Structure] Two supported portions 31 are provided respectively on both longitudinal direction end walls 22a of a cutter head 21 having a plurality of inner blades 24, 25 and an outer blade 26 inscribed therein, and both end walls 22a of the cutter head 21 are provided. The two supported portions 32 that are fitted respectively corresponding to the two supported portions 31 are provided on both end walls 12 of the main body case 11 that face each other, and the two supported portions that fit into the two supported portions 32 are provided. 31 is movable, and the movement locus is formed in an arc shape, and the distance Y between the centers of rotation of these two movement loci is set larger than the separation distance X between the two supported portions 31. , The head 21 with respect to the body case 11
Was attached so as to be swingable in a direction orthogonal to its longitudinal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating electric shaver having a cutter head having a plurality of inner blades and swinging.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 62-227395 discloses
A cutter head having two inner blades and one outer blade in which two arch-shaped outer blade portions inscribed therein are juxtaposed is swingably attached to the main body case, and serves as a fulcrum of the swing. A technique is shown in which the pivot is provided above a straight line passing through a limit point where the outer blade contacts the inner blade.

As for the arrangement of the pivots in this technique, either FIG. 8 or FIG. 9 can be considered. Figure 8 shows the case where the pivot is placed above the tangent line connecting the vertices of the two inner blades,
FIG. 9 shows a case where the pivot is arranged below the tangent line. 8 and 9, reference numeral 1 is a main body case, 2 is a swingable cutter head, 3 is an inner blade, 4 is an outer blade, 5 is a pivot axis, A is a limit point, B is an apex of the inner blade 3, C indicates tangent lines, respectively. The inner blade 3 and the outer blade 4 are provided on the cutter head 2, and a pivot 5 rotatably supports both longitudinal ends of the cutter head 2 with respect to the main body case 1. Irrespective of the swinging of the main body case 1, it is reciprocally moved by a drive mechanism (not shown) incorporated in the main body case 1.

[0004]

Problems to be Solved by the Invention JP-A-62-2273
8 and 9 when the electric shaver disclosed in Japanese Patent Publication No. 95 is used.
The center tangent line C and the skin surface of the user coincide with each other, and the shaving is performed by moving the electric razor, for example, in the direction of arrow D in FIGS. 8 and 9. In this case, the cutter head 2 receives a force (in other words, a frictional force) F in the direction opposite to the moving direction along the tangent line. This force F is a component force Fp in a straight line connecting the pivot 5 and the apex C, and a force Fm in a direction perpendicular to this.
And the cutter head 2 is moved by the component force Fm. That is, in the configuration of FIG.
Acts as a counterclockwise rotational couple, and the cutter head 2 is rotated counterclockwise about the pivot 5. Further, in the configuration of FIG. 9, the component force Fm acts as a clockwise rotational couple, and the cutter head 2 is rotated clockwise about the pivot shaft 5.

Therefore, in the configuration of FIG. 8, the counterclockwise rotation of the cutter head 2 pushes down the inner blade 3 on the left side (front side in the moving direction of the razor) in FIG. 8 and the outer blade portion inscribed therein. Since the inner blade 3 on the right side (the rear side in the moving direction of the razor) and the outer blade portion inscribed therein are pushed up, the contact with the skin is maintained. However, in the configuration of FIG. 8, since the pivots 5 are above the tangent line C, there is a problem in that the periphery of these pivots comes into contact with the skin, and the shaving is liable to be disturbed.

In the configuration of FIG. 9, there is no problem as in FIG. 8, but the inner blade 3 and the outer blade portion on the left side in FIG. 9 are raised by the clockwise rotation of the cutter head 2, and
The inner blade 3 and the outer blade portion on the right side are lowered. Therefore, since the left outer blade portion increases the contact force with the skin and increases the frictional force with the skin, there is a problem that the sliding with the skin becomes worse and the right outer blade portion easily separates from the skin. is there.

It is an object of the present invention that the structure for swinging the cutter head does not interfere with the shaving, and
The object is to obtain a reciprocating electric shaver that can improve the followability of the cutter head to the skin due to the swing of the cutter head.

[0008]

SUMMARY OF THE INVENTION The present invention comprises a cutter head having a plurality of inner blades that reciprocate along the longitudinal direction, and an outer blade in contact with these inner blades. Is applied to a reciprocating electric shaver mounted so as to be swingable in a direction orthogonal to the longitudinal direction of the cutter head, and in order to achieve the above object, two supported parts are provided on both end walls in the longitudinal direction of the cutter head. And two support portions that respectively fit correspondingly to the two supported portions are provided on both end walls of the main body case that face both end walls of the cutter head, and are fitted to the two support portions. The two supported parts are movable,
In addition, the movement locus is formed in an arc shape, and the distance between the rotation centers of these two movement loci is made larger than the distance between the two supported portions.

[0009]

In the structure of the present invention, the two supporting portions and the supported portions which are fitted to each other support the cutter head so as to be swingable with respect to the end wall of the main body case. Then, the two supported portions respectively provided on the end walls of the cutter head move along an arcuate locus as the cutter head swings. Since the distance between the centers of rotation of these movement trajectories is larger than the distance between the two supported parts, the mutual relationship between the two supporting parts and the two supported parts that fit with each other is determined by the two levers in the four-bar rotation chain. The cutter head is swingably supported by the case body through the both lever mechanisms which are substantially equivalent to the mechanism and which are substantially arranged at both ends in the longitudinal direction of the cutter head.

Further, the both lever mechanisms are one in which one of a pair of links connecting two swinging links, for example, a link facing a shortest link is fixed. Therefore, when the inner blade located on the front side in the moving direction of the razor during shaving and the outer blade portion inscribed therein receives a force due to contact with the skin, at the same time the inner blade and the outer blade portion inscribed therein are pushed down, The inner blade located on the rear side in the moving direction of the razor and the outer blade portion inscribed therein are pushed up, and the outer blade portion is pressed against the skin.

Further, since the supporting portion and the supporting portion forming the both lever mechanisms are provided on both end walls of the cutter head in the longitudinal direction and the end wall of the main body case opposed thereto, both are connected by a tangent line connecting the apexes of the inner blades. Located on the underside, these do not hit the skin when shaving.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. Reference numeral 11 in FIGS. 1 and 2 denotes a main body case made of synthetic resin, and upward end walls 12 located at both ends in the width direction of the case 11 are integrally projected. The upper surface of the upper end wall 11a of the main body case 11 in which the lower ends of the end walls 12 are integrally connected is formed by a concave curved surface along the thickness direction of the case 11, that is, the front-rear direction, and the center of the upper end wall 11a is substantially centered. Through hole 13
Are formed.

A motor 14 is built in the body case 11. An eccentric cam 16 is fixed to the rotating shaft 14a of the motor 14 and has a drive shaft 15 protruding upward at a position eccentric to the shaft 14a. The upper portion of the eccentric cam 16 is projected to the outside of the main body case 11 through the through hole 13.

A cutter head 21 is provided on the main body case 11 so as to be swingable in a direction orthogonal to the longitudinal direction thereof, that is, along the front-back direction of the concave curved surface. As shown in FIGS. 1 to 3, the cutter head 21 includes a head frame 22, a head base 23, and two inner blades 24 and 25.
And one outer blade 26.

The head frame 22 includes a pair of left and right end walls 2.
A frame structure is formed in which both upper and lower ends are opened from 2a and front and rear wall portions 22b which are connected to each other and are long in the left-right direction. The lower surface of the end wall 22a is formed as an arcuate surface along the upper surface of the upper end wall 11a, and the wall portion 22b is formed.
Outer blade locking portions 27 are provided inside the respective. The outer blade locking portion 27 is formed by, for example, a step portion and extends in the longitudinal direction of the wall portion 22b.

The head base 23 is made of a synthetic resin, and has a flat plate-shaped base main portion 2 having a downward projecting edge on the peripheral portion.
Two arms 23b facing upward are formed integrally on both ends of 3a. The total length of the base main portion 23a is shorter than the distance between the inner surfaces of the left and right end walls 22a of the head frame 22. Each arm 23b has a thin plate structure that can be flexibly deformed, and its relatively thick upper end portion is fixed to the upper inner surface of the end wall 22a of the head frame 22, respectively. Therefore, the base main portion 23a is connected to each arm 23
It is suspended via b and is provided so as to be able to reciprocate in the longitudinal direction through the flexible deformation of each arm 23b.

As shown in FIG. 1, a cam groove 28 having a groove width substantially the same as the diameter of the drive shaft 15 is provided on the lower surface of, for example, the central portion in the longitudinal direction of the base main portion 23a. The cam groove 28 is formed between a pair of wall plate portions 28a (only one of which is shown in FIG. 1) extending in a direction orthogonal to the longitudinal direction of the base main portion 23a, and the lower surface of the wall plate portion 28a has the above-mentioned structure. It is formed in an arcuate surface along the upper surface of the upper end wall 11a. The drive shaft 15 is inserted in the cam groove 28. Therefore, when the drive shaft 15 is eccentrically rotated, the head base 2 is moved with a stroke twice the eccentric amount.
3 is reciprocally moved in the longitudinal direction of the arm 23b along with the flexible deformation of each arm 23b.

Two inner blade support shafts 29 are integrally projected on the upper surface of the central portion of the base main portion 23a in the longitudinal direction, for example. One inner blade 24 is attached to one support shaft 29 so as to be movable in its axial direction, and the other inner blade 25 is attached to the other support shaft 29 so as to be movable in its axial direction. . Further, both support shafts 29 have a stepped structure in which the lower part has a large diameter, and coil springs 30 are respectively interposed between the large diameter part and the inner blades 24, 25. Coil spring 3
0 gives an upward biasing force to the inner blades 24, 25. In FIG. 1, reference symbol K is the apex of the inner blades 24 and 25, and J is the apex 2.
It is a tangent line passing through 4,25.

The outer blade 26 has a first outer blade portion 26a having an arcuate cross section on which the inner blade 24 is pressed, and a second outer blade portion 26b having an arcuate cross section on which the inner blade 25 is pressed. is doing. Both of these outer blades 26 arranged side by side
Although not shown, innumerable whisker cutting holes are formed in a and 26b. Further, engaging portions 26c made of synthetic resin are attached to the outer surfaces of both side edges of the outer blade 26, respectively.

The outer blade 26 is formed by the cutter head 21.
By engaging the engaging portions 31 with the outer blade engaging portions 27, the upper opening of the cutter head 21 is closed and the detachable portion is provided. The outer blade 26 is the inner blade 24,
It can move up and down in FIG.

Next, a structure for swingably attaching the cutter head 21 will be described. As shown in FIG. 2 and the like, the end wall 22a of the head frame 22 is provided with two engagement holes 31 which are located inside the outer contour of the end frame 22a and serve as supported portions, and are separated by a distance X in the front-back direction of the head frame 21. It is provided separately. A support link 3 as a support portion is provided in these engaging holes 31.
The upper end shaft portions 32a provided at the upper ends of the two are fitted rotatably, respectively. Further, the two support links 32 having the same length are attached to the end wall 12 of the main body case 11 facing the end wall 22a. That is, the end wall 12 is provided with two bearing holes 33 located inside the outer contour of the end wall 12, and the lower end shaft portions 32b provided at the lower ends of the support links 32 are rotatable in the bearing holes 33, respectively. It is fitted. The two bearing holes 33 are separated from each other by the rotation centers of the movement locus described later, that is, the distance Y between the rotation centers.
However, the body case 12 is separated in the front-rear direction (thickness direction), and the rotation center distance Y thereof is larger than the separation distance X. Therefore, the cutter head 21 is swingably supported through the rotation of the pair of left and right support links 32 about the bearing holes 33.

In the reciprocating electric shaver of the above construction, when the motor 14 is operated, the eccentric rotation of the drive shaft 15 rotated thereby causes the cam groove 28 of the head base 23 to rotate.
The engagement with the head base 23 is converted into a reciprocating motion in the longitudinal direction of the head base 23. Therefore, together with the head base 23, the two inner blades 24, 25 are simultaneously moved while being in contact with the inner surfaces of the first outer blade portion 26a and the second outer blade portion 26b of the outer blade 26. Therefore, the beard introduced into the beard cutting hole of the outer blade 26 can be cut by moving the inner blades 24, 25.

In this shaver, the support links 32 and the like for swingably supporting the cutter head 21 on the end wall 12 of the main body case 11 are the outer shells of the end walls 12 and 22a of the main body case 11 and the cutter head 21 facing each other. Since it is inside the wall and is not projected outside, the support link 3
Second grade does not hit the skin. Therefore, the support link 32 and the like do not interfere with the shaving, and the usability is good.

The head frame 22 of the cutter head 21 is not reciprocally moved together with the head base 23 during the shaving, and the solid line in FIG. The same as when the skin Z is lowered to the position shown by the chain double-dashed line from the position, the outer blade 26 can move slightly in the vertical direction and can follow the unevenness of the skin Z.

By the way, the cutter head 21 is, as shown by the solid line in FIGS. 1 and 4, in a normal state or when a load is applied from directly above due to its own weight.
The support link 32 of the book is arranged in a V shape, is stable, and does not swing. In this state, the space between the two bearing holes 33, which serve as the center of rotation of the two support links 32, can be regarded as a fixed link, and the upper end shaft portions 32a of the two support links 32 are engaged with each other. The space between the dowels 31 can also be regarded as a link. Further, as described above, the distance between the bearing holes 33, that is, the distance Y between rotation centers (considered as the length of the fixed link) is more than the distance X between the engagement holes 31 (considered as the length of the link). Is long,
After all, a structure equivalent to the both lever mechanism in the four-bar rotary chain is provided at both ends in the longitudinal direction of the cutter head 21, and the cutter head 21 can swing on the case body 11 via these both lever mechanisms. Supported by.

Therefore, when shaving is performed by sliding the entire razor to the left in FIG. 4, the inner blade 24 located on the front side in the moving direction and the outer blade 26 inscribed therein.
The first outer blade portion 26a receives the force G due to the contact with the skin.
Then, when the skin is tilted as shown in FIG. 5, the one support link 32 positioned on the front side in the moving direction is rotated by the force G in the clockwise direction about the bearing hole 33, The inner blade 24 and the first outer blade portion 26a in contact with the inner blade 24 are moved from the position of the inner blade 24 shown by the solid line in FIG. 4 to the position shown by the dotted line in FIG. It is pushed down to the position shown. Note that FIG.
A medium symbol L indicates the support link 32 located on the front side in the moving direction.
The movement loci of the upper end shaft portion 32a and the engagement hole 31 are shown.

With the movement of the one support link 32 as described above, the end wall 22a of the head frame 22 acts as a connecting rod and the other support link 32 positioned on the rear side in the moving direction is provided with the bearing hole 33. Rotate clockwise around the center. Therefore, the inner blade 25 located on the rear side in the moving direction is
And the second outer blade portion 26b inscribed therein moves from the position of the inner blade 25 shown by the solid line in FIG. 4 to the position shown by the dotted line in the figure, and further to the position shown by the dashed line in FIG. 2 when the force G is large. Pushed up. Note that reference symbol M in FIG. 4 indicates the movement loci of the upper end shaft portion 32a of the support link 32 and the engagement hole 31 located on the rear side in the movement direction.

Since the inner blade 25 and the second outer blade portion 26b located on the rear side in the moving direction of the razor are pushed up in this manner, the close contact between the second outer blade portion 26b and the skin Z can be maintained. That is, since the ability to follow the skin Z is good, the sharpness is not deteriorated, and therefore the characteristics of the twin blade can be maintained. Moreover, since the first outer blade portion 26a located on the front side in the moving direction does not intensify the bite into the skin Z, the razor can be smoothly and easily moved along the skin Z to perform shaving.

In the first embodiment, the supporting link is used as the supporting portion for swinging the cutter head. However, the supporting link may be omitted and may be carried out as shown in FIG. 6 or 7. In this case, not only the intended object of the present invention can be achieved, but also the number of parts is reduced and the manufacturability can be improved.

In the second embodiment shown in FIG. 6, two guide grooves 41 having an arc shape are provided in the inner surface of the end wall 12 of the main body case 11 as a support portion in an inverted V shape. Further, two projecting shaft portions 42 as supported portions are provided on the outer surface of the end wall 22a of the cutter head 21, and these projecting portions 42 are slidably fitted in the guide grooves 41, respectively. Therefore, the center line of the guide groove 41 coincides with the movement loci L and M of the protruding shaft portion 42, and the point P in FIG. 6 indicates the center of rotation of the movement loci L and M, and R.
Indicates the radius of gyration. The configuration other than the points described above is the same as that of the first embodiment including points not shown.

Also in the structure of the second embodiment, when the razor is slid to the left in FIG. 6 to perform shaving, the first inner blade positioned on the front side in the moving direction and the first outer blade inscribed with the inner blade are moved. The outer blade receives a force G due to contact with the skin. Therefore, at the same time, one of the protruding shaft portions 42 located on the front side in the moving direction is guided downward by the guide groove 41 on the front side, and at the same time, the other protruding shaft portion 42 located on the rear side in the moving direction of the razor is rear side. Is guided upward by the guide groove 41. Therefore, the cutter head 21 lowers while the front side in the moving direction of the razor lowers,
The intended purpose of the present invention can be achieved.

In the third embodiment shown in FIG. 7, two guide grooves 51 having an arc shape are provided in the inner surface of the end wall 12 of the main body case 11 as a supporting portion in an inverted V shape. Further, two projecting shaft portions 52 serving as supported portions are provided on the outer surface of the end wall 22a of the cutter head 21, and sliders 53 are rotatably fitted to these projecting shaft portions 52, respectively. Then, the sliders 53 are slidably fitted in the guide grooves 51, respectively. Therefore, the center line of the guide groove 51 is
7 and the movement loci L and M of the slider 53.
The middle point P indicates the center of rotation of the movement loci L and M, and R indicates the turning radius. The configuration other than the points described above is the same as that of the first embodiment including points not shown.

Also in the structure of the third embodiment, when the razor is slid to the left in FIG. 7 to perform shaving, the first inner blade located on the front side in the moving direction and the first outer blade inscribed therewith. The outer blade receives a force G due to contact with the skin. Therefore, the one protruding shaft portion 52 located on the front side in the moving direction and the slider 53 fitted thereto are guided downward by the guide groove 51 on the front side, and at the same time, the other located on the rear side in the moving direction of the razor. Protruding shaft part 5
2 and the slider 53 fitted thereto are guided upward by the guide groove 51 on the rear side. Therefore, in the cutter head 21, the front side in the moving direction of the razor is lowered and the rear side is raised, so that the intended object of the present invention can be achieved.

The present invention is not limited to the above embodiments.
For example, in the embodiment shown in FIGS. 6 and 7, the protruding shaft portion 41 or the slider 53 is provided on the end wall 12 of the main body case 11.
The projecting shaft portion 52 into which is fitted is provided as a supporting portion, and the end wall 22a of the cutter head 21 is provided with the guide groove 41 or 51 into which the supporting portion is fitted as a supported portion. It doesn't matter.

Further, in each of the above-mentioned embodiments, the outer blade 26 is a single piece having a plurality of outer blade portions, but instead of this, the same number of outer blades as the inner blades may be provided on the head frame. good. Further, the number of inner blades is not limited to two and may be three or more.

[0036]

As described above in detail, according to the present invention, two supported portions are provided on both longitudinal end walls of a cutter head having a plurality of inner blades and outer blades inscribed therein, and Two support parts, which respectively fit into the two supported parts, are provided on both end walls of the main body case facing the both end walls of the cutter head, and the two supported parts are fitted to the two support parts. Is movable, and the movement locus is formed into an arc shape, and the distance between the centers of rotation of these two movement loci is made larger than the distance between the two supported parts, and On the other hand, due to the structure in which the head is swingably mounted in the direction orthogonal to the longitudinal direction of the razor, the inner blade located on the front side in the moving direction of the razor and the outer blade portion inscribed with the razor are in contact with the skin to exert force. When I received it, The inner blade located on the rear side in the moving direction of the razor can press the outer blade portion that is inscribed on the skin, thus improving the followability of the cutter head to the skin due to the swing of the cutter head and supporting it. Part and support part,
All of them are arranged below the tangent line connecting the vertices of the inner blades, and they do not hit the skin during shaving. Therefore, the structure for swinging the cutter head does not interfere with the shaving, and the usability is good.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure around a cutter head of an electric shaver according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the periphery of the cutter head shown in FIG.

FIG. 3 is an exploded perspective view of the cutter head shown in FIG.

FIG. 4 is a view showing the principle of operation of two inner blades according to the first embodiment.

FIG. 5 is a view showing an operation when the electric shaver according to the first embodiment is used.

FIG. 6 is a side view showing a partial cross-section of a configuration around a cutter head of an electric shaver according to a second embodiment of the present invention.

FIG. 7 is a side view showing a partial cross-section of a structure around a cutter head of an electric shaver according to a third embodiment of the present invention.

FIG. 8 is a side view schematically showing a configuration around a cutter head of a conventional electric shaver.

FIG. 9 is a side view schematically showing a configuration around a cutter head of a conventional electric shaver.

[Explanation of symbols]

11 ... Main body case, 12 ... End wall, 21 ... Cutter head, 22a ... End wall, 24, 25 ... Inner blade, 26 ... Outer blade, 3
DESCRIPTION OF SYMBOLS 1 ... Engagement hole (supported part), 32 ... Support link (supporting part), 33 ... Bearing hole, 41, 51 ... Guide groove (supporting part), 42 ... Projected shaft part (supported part), 52 ... Projection Shaft part (supported part), 53 ... Slider (supported part), X ... Separation distance, Y ... Distance between rotation centers, L, M ... Movement locus.

Claims (1)

[Claims] 1. A cutter head having a plurality of inner blades that reciprocate along a longitudinal direction and an outer blade with which the inner blades are inscribed. The cutter head is provided in a longitudinal direction of the cutter head with respect to a main body case. In a reciprocating electric shaver mounted so as to be swingable in a direction orthogonal to, two supported parts are provided on both end walls in the longitudinal direction of the cutter head, and both ends of the main body case facing both end walls of the cutter head. The wall is provided with two supporting portions that respectively fit into the two supported portions, and the two supported portions that fit into the two supporting portions are movable and the movement locus Is a circular arc, and the distance between the centers of rotation of these two trajectories is made larger than the distance between the two supported parts.