JPH10137461A - Rotary electric razor - Google Patents

Abstract

(57) [Problem] To provide a rotary electric shaver which prevents a decrease in strength of an inner blade. A rotary electric shaver that rotates an inner cutter base having an inner cutter that is biased by a spring to cut a beard by a blade that slides on an inner surface of an outer cutter. A guide recess 56 is formed at the lower end edge of the through hole 55 (engaging portion) corresponding to the through hole 55, so that the spring 34 corresponds to the guide recess formed at the base inserted into the inner blade insertion hole 32. At the same time, until the insertion amount of the base portion 51 into the inner blade insertion hole 32 reaches a predetermined amount, the front end portion contacts the edge of the guide concave portion 56, and when the insertion amount exceeds the predetermined amount, the front end is guided. A rotary electric shaver, which is set to have a length deviating from an edge of the concave portion 56 and is engaged with the through-hole by restoring when the base is inserted beyond a predetermined amount and the tip corresponds to the through-hole 55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric shaver, and more particularly to a rotary electric shaver for preventing deformation of an inner blade.

[0002]

2. Description of the Related Art A conventional rotary electric razor (hereinafter simply referred to as an electric razor) is provided with a disposing portion for disposing an inner blade base having an opening facing outward in a main body case. An inner blade base having a plurality of beard introduction holes is attached to the opening, and the inner blade base is rotated by a motor provided in the main body case to be introduced from the beard introduction hole. The beard is shaved by cutting the beard.

[0003] As a conventional structure for attaching the inner blade of the electric shaver to the inner blade base, there is a structure as shown in Figs. That is, as shown in FIG. 12, the inner blade base 200 is formed in a substantially disk shape, and forms an inner blade mounting hole 201 formed of a through hole formed in an elongated hole shape along the normal direction from the center thereof, The inner blade 210 attached to the inner blade mounting hole 201 includes a base 211 and a blade portion 212 integrally formed on the upper portion of the base 211 as shown in FIG. A groove 214 is formed, and the introduction groove 214 has a lower portion communicated with the outside by an opening 214a formed at a lower end edge of the base portion 211, and an upper portion has a substantially concave portion formed by a locking projection 213a formed in a lateral direction. It is formed to be bent in the shape of a letter, and the introduction groove 214 is formed by the locking projection 213a.
An engagement hole 213 is formed in the back portion of.

A spring mounting hole (not shown) is formed on the back side of the inner cutter base 200 in the drawing, and the spring mounting hole has a linear action portion 221 and an action portion 221.
A spring 220 having a mounting portion 222 bent in a substantially rectangular shape at one end of the spring 220 is mounted by inserting the mounting portion 222 into the spring mounting hole. When the spring 220 is attached to the inner cutter base 200, the action portion 222 is disposed across the attachment hole 201 in a direction orthogonal to the longitudinal direction of the attachment hole 201. When the inner blade 210 is inserted into the mounting hole 201, the crossing position is set so as to be located at a position corresponding to the opening 214a provided in the base 211 thereof. When the spring 220 is attached to the inner cutter base 200, the acting portion 221 is applied with an urging force upward in the drawing.

The inner cutter 220 is attached to the inner cutter base 200 by attaching the base 211 of the inner cutter 210 to the mounting hole 201 of the inner cutter base 200 to which the spring 220 is attached from above in FIGS. When the base portion 211 is inserted into the mounting hole 201, the action portion 22 of the spring 220 is inserted through the opening 214a.
1 enters the introduction groove 214, and further continues to insert the base portion 211. Since the operating portion 221 is applied with an upward biasing force, the operating portion 221 bypasses the locking convex portion 213a by the restoring force. In FIG. 14, through the path shown by the dashed line in the direction of the arrow, it automatically enters the engaging hole 213 and engages. In this state, the inner blade 210 is urged upward in the drawing by the action portion 221 of the spring 220 engaged with the engagement hole 213, and is held in the mounting hole 201 so as to be movable in the vertical direction. Things. When the inner cutter base 200 to which the inner cutter 210 is attached is disposed in the inner cutter disposition portion provided in the main body case and an outer cutter (not shown) is attached, the blade portion 212 of the inner cutter 210 is attached with a spring 220. The blade is pressed against the inner surface of the outer blade by the force. When the inner blade base 200 is driven to rotate by the motor, the beard introduced from the beard introduction hole of the outer blade is cut by the blade portion 212 and shaved, and shavings are collected in the inner blade disposition portion. It has become.

As described above, the inner blade 210 is automatically mounted on the inner blade base 200 by continuously inserting the base 211 of the inner blade 210 into the mounting hole 201. Since the opening 214a of the introduction groove 214 formed in the base 211 of the 210 is formed, the strength of the inner blade 210 is reduced, and in addition, during shaving, the entire outer peripheral surface of the outer blade (not shown) is simultaneously in contact with the skin. Since only the outer side, which is the outer side, is in contact with and pressed, the blade section 212 is subjected to uneven pressing force, that is, a load, and the blade section 212 is deformed. As a result, the blade section 212 is deformed. Good contact between the outer blade and the inner peripheral surface of the outer blade is impaired, which adversely affects the sharpness.
Since the introduction groove 214 formed at the bottom has an opening 214a,
The base portion 211 also deforms due to the deformation of the blade portion 212 or the like, that is, deforms so that the flatness is impaired, and the deformation in the mounting hole 201 is not smoothed. Satisfactorily, and a good sliding contact relationship is not obtained.

[0007]

As described above, in the conventional electric shaver, the introduction groove 2 having an opening 214a at the lower end for introducing a spring to the base 211 of the inner blade 210 is used.
14, the inner blade 210, that is, the blade portion 2
12 and the strength of the base 211 are reduced, the blade 212 is deformed when the pressing force applied to the blade 212 during shaving becomes uneven, that is, the blade 211 is deformed.
As a result, the smoothness of the inner blade 210 in the mounting hole 201 is hindered, and as a result, a good contact between the blade portion 212 and the inner surface of the outer blade is prevented. There is a problem in that a sliding relationship cannot be obtained, the sharpness is poor, and good shaving cannot be performed.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the invention according to claim 1 is characterized in that a main body case in which a motor is housed and an inner blade base disposition portion is provided is provided. An outer blade attached to the inner cutter base disposition portion and having a number of beard introduction holes, and an inner cutter insertion hole disposed on the inner cutter base disposition portion and rotated by the motor and penetrated in the axial direction are formed. An inner blade base, a biasing spring having one end attached to the inner blade base and the other end intersecting the inner blade insertion hole, a base inserted into the inner blade insertion hole, A blade portion provided on one end side of the base portion and having an engaging portion for engaging the spring with the base portion, and urging the blade portion against an inner surface of an outer blade by the urging spring to form the inner blade. And an inner blade attached to the base, and a blade portion for rotatingly driving the inner blade base and slidingly contacting the inner surface of the outer blade. In a rotary electric shaver for cutting a beard more, the engaging portion is formed by a through hole passing through the base, and a guide recess is formed at a lower end edge of the base corresponding to the through hole, and the other end of the spring is formed. Correspond to the guide recess formed in the base inserted into the inner blade insertion hole, and the length of the spring is adjusted at the other end until the insertion amount of the base into the inner blade insertion hole reaches a predetermined amount. When the distal end abuts against the edge of the guide concave portion and curves as the base is inserted and the insertion amount exceeds a predetermined amount, the distal end of the other end is set to be separated from the edge of the guide concave portion, and the base exceeds the predetermined amount. And a rotary electric shaver that is engaged with the through hole by restoring by its own elastic force when the tip of the other end corresponds to the through hole.

As described above, according to the first aspect of the invention, the engaging portion for engaging with the spring formed in the base is formed by the through hole penetrating the base, and the guide recess is formed at the lower end edge of the base in correspondence with the through hole. Due to the formation, the strength of the inner blade can be prevented from being reduced, and the guide recess can guide the spring to a position corresponding to the through-hole, and the other end of the spring can be connected to the guide recess. In addition to this, the tip of the spring abuts on the edge of the guide recess until the insertion amount of the base into the inner blade insertion hole exceeds a predetermined amount, and the spring curves as the base is inserted, and the insertion amount becomes a predetermined amount. When it reaches, the tip is set to a length that deviates from the edge of the guide recess, and when the base is inserted beyond a predetermined amount and the through hole corresponds to the tip, it engages with the through hole by restoring by its own elastic force. Since was Unishi, attachment to the inner blade base of the inner cutter are those having an effect of automatically done by inserting the inner cutter to the inner cutter mounting hole from its base.

According to a second aspect of the present invention, there is provided the rotary electric shaver according to the first aspect of the present invention, wherein the through hole has a substantially triangular shape, and one apex angle is formed in the direction of the blade portion. It is.

According to the second aspect of the present invention, the through hole has a substantially triangular shape and one of the apical angles is directed toward the blade portion. The tip of the working portion of the spring, which is restored by the elastic force, can easily and reliably enter the through-hole, and the engaged spring is located at the apex, so that the inner blade can be stably attached to the inner surface of the outer blade. This has the effect of pressing against the surface.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, A is an electric razor,
The electric shaver A is provided with a main body case 1 including a front case 1a and a rear case 1b, a motor 2 (not shown in FIG. 1) provided in the main body case 1, an outer blade 25, and an inner blade 50. It is composed of an inner blade base 30 (not shown in FIG. 1) and the like. An annular protruding wall 1c is formed on the front case 1a of the main case 1 so as to protrude from one end of the front case 1a. An inner cutter base disposition chamber (hereinafter simply referred to as a disposition chamber) 10 (not shown in FIG. 1) is formed as an inner cutter stand disposition portion that accommodates and disposes the stand 30 and the like.

As shown in FIG. 2, the installation chamber 10 has a bottom wall 11 and an annular wall 1 formed on an outer peripheral portion of the bottom wall 11.
2 and an opening 13 on the outside, that is, on the upper side in FIG.
Are formed in a bottomed cylindrical shape. A through hole 14 is formed in the bottom wall 11, and an output shaft 2 a of the motor 2 is provided to protrude from the through hole 14. The output shaft 2 a is a drive shaft that transmits the torque of the motor 2. A certain coupling 3 is attached, and a centering shaft portion 3a is formed at a distal end portion of the coupling 3 and an engaging portion 3b made of unevenness is provided at a base portion. A male screw 15 is formed on the outer peripheral wall of the annular wall 12 of the installation chamber 10.

The motor 2 is attached to a bottom wall 11 of the installation chamber 10 by a screw (not shown) and housed in the main body case 1. The main body case 1
Although not shown, a battery for supplying electric power to the motor 2 is housed therein, and an operation switch for supplying and stopping electric power from the battery to the motor 2 is provided at a front portion of the front case 1a as shown in FIG. S is provided.

An outer cutter frame 20 having an outer cutter 25 integrally attached thereto is detachably attached to the disposition chamber 10, and the outer cutter frame 20 is made of synthetic resin and formed in a cylindrical shape. At the same time, a female screw 21 is formed on the inner peripheral wall to be screwed into a male screw 15 formed on the outer periphery of the annular wall 12 of the installation chamber 10. The female screw 21 is screwed into or unthreaded from the male screw 15. As a result, the annular wall 12, that is, the installation chamber 10, can be attached and detached as described above. The outer blade 25 is made of a thin metal plate as shown in FIG.
As shown in FIG. 2, a substantially spherical concave portion 26 is formed at the center portion, and a number of small holes 27a are formed on the outer peripheral portion of the concave portion 26 as shown in FIG. A beard introduction hole 27 is formed from the provided elongated hole 27b, and the small hole 27a and the elongated hole 27b are for introducing a normal beard and habitual beard, respectively.

In the drawing of the outer cutter frame 20, an annular engaging ridge 23 is formed at the upper end, and the engaging ridge 23 is tapered and inclined toward the tip. Guide surfaces 23a and 23b are formed.

Next, the inner blade base 30 provided in the installation chamber 10 will be described. The inner blade base 30 is made of a synthetic resin and is formed in a circular shape as shown in FIGS. 2 to 5, and the side facing the bottom wall 11 of the installation chamber 10, that is, FIG.
In the lower central portion, an alignment bearing portion 31a having an axial center coinciding with the central axis of the inner cutter rest 30 and fitted to the alignment axis portion 3a of the coupling 3, and the alignment bearing portion Engagement portion 3b of the coupling 3 which is formed below the lower portion 31a
Coupling 31 having an engaging portion 31b that engages with and disengages from the coupling 31
Is provided.

As shown in FIGS. 3 to 5, the inner cutter base 30 is formed so as to extend radially from the center thereof, that is, in the normal direction, and penetrate in a direction parallel to the central axis of the inner cutter base 30. An attachment hole 32 is provided as an inner blade insertion hole for disposing the inner blade 50 described later in a loosely fitted state. As shown in FIG. 6, the mounting hole 32 has slits 32a having a width L at which the base portion 51 of the inner blade 50 can slide, and a substantially U-shaped through hole 32b is formed on one side wall. On the other side wall, a ridge portion 32c is formed at a position substantially at the center of the U-shaped through hole 32b so as to face the base portion 51 of the inner blade 50, and both sides of the ridge portion 32c penetrate. Holes 32d, 32d are formed. The U-shaped through-hole 32b allows the beard cut by the blade of the inner blade to drop to the bottom wall 11 side of the storage chamber 10 through the through-hole 32b.

As shown in FIGS. 5 to 11, the ridge 32c penetrates in the direction perpendicular to the direction in which the base 51 of the inner blade 50 slides, and is opened at the lower end. Elongated guide grooves 40 are formed, and three spring mounting holes 33 are formed on the rear surface side of the inner cutter base 30 as shown in FIG. The spring mounting hole 33 has a mounting portion 34b provided at one end thereof and bent in a substantially rectangular shape.
A spring 34 as an urging spring 4a is attached by inserting the attachment portion 34b into the spring attachment hole 33 as shown in FIGS. The action portion 34a of the spring 34 causes the mounting hole 32 to cross the mounting hole 32 in a direction perpendicular to the sliding direction of the base 51 of the inner blade 50, that is, the direction perpendicular to the direction in which the mounting hole 32 penetrates. The guide groove 4 formed in the ridge 32c
The guide groove 40 is mounted on the inner cutter base 30 such that the guide groove 40 is located above the guide groove 40 in the figure. As a result, the inner blade 50 is urged upward in the drawing as described later. In the free state, the action portion 34a of the spring 34 has a guide groove 40 as shown in FIG.
Is set to be located at the center portion of the guide groove 40 and above the guide groove 40.

When the base 51 of the inner blade 50 is inserted into the mounting hole 32, the length of the spring 34, that is, the action portion 34a, reaches a predetermined amount after the insertion of the base 51 is started. Until the bottom edge of the base, that is, the edge of the guide recess 56 formed in the base 51 described later, and as the insertion of the base 51 proceeds, curves along the trajectory shown by the two-dot chain line in FIGS. When the base portion 51 exceeds a predetermined amount, the length is set so as to deviate from the edge of the guide recess 56. Then, the base portion 51 is further inserted, and as shown by the two-dot chain line in FIG.
When the tip of a corresponds to a through hole 55 formed in the base 51 described later, it is restored by its own elastic force, that is, moves upward and enters the through hole 55 to engage with the through hole 55. The specific dimensions of the length are determined by the size and shape of the inner blade base 30 and the outer blade 2 of the blade portion of the inner blade 50.
5 differs depending on the specific shape, such as the contact pressure against the inner surface and the overall length of the spring 34, and is determined by experiments or the like at the time of specific design.

As shown in FIGS. 3 to 5, three U-shaped notches 35 are formed on the outer peripheral wall of the inner cutter base 30 so as to be equally arranged. As described above, a locking piece 36 formed in a U-shaped cross section and given elasticity is formed,
A projection 37 is formed at the tip of the locking piece 36, and the projection 37 is adapted to engage and disengage with the engaging ridge 23 formed on the outer cutter frame 20. Further, the projection 37 is formed to be tapered toward the front end, which is a guide surface 37a, 37b whose upper and lower surfaces are inclined in the figure.

The inner cutter base 30 is removably housed in the outer cutter frame 20 to which the outer cutter 25 is attached. When the inner cutter base 30 is stored in the outer cutter frame 20, the inner cutter base 30 is inserted from below the outer cutter frame 20 in FIG. The outer blade frame 20 is inserted and stored until it gets over the engaging ridge 23. When the inner cutter base 30 is to be removed from the outer cutter frame 20, the protrusions 37 of the locking pieces 36 are engaged with the engagement protrusions 2 so that the inner cutter base 30 faces downward in the drawing of the outer cutter frame 20.
3 can be removed by pulling it out until it gets over. When the projection 37 of the locking piece 36 gets over the engaging convex edge 23, the locking piece 34
And the guide surfaces 37a, 37b and 23a, 23b formed on the projections 35 and the engaging ridges 23, respectively, so that they can be easily overcome. The reason why the inner cutter base 30 is removed together with the outer cutter frame 20 is that the inner cutter 5 is removed when the outer cutter 25 is removed.
This is for the purpose of preventing the inner blade base 30 to which the “0” is attached from being left in the disposition chamber 10 in an exposed state and the inner blade base 30 rotating in this state.

Next, the inner blade 50 provided in the mounting hole 32 of the inner blade base 30 will be described. The inner blade 50 is made of a thin metal plate and includes a base 51 and a blade 52 integrally formed on one end of the base 51. On both sides of the other end of the base 51, guide projections 53, 53 for guiding when moving in the mounting hole 32 are formed. The base portion 51 has a through hole 55 which is an engaging portion that engages with the distal end portion of the action portion 34a of the spring 34. The through hole 55 is formed in a substantially triangular shape. The apex angle is upward, that is, toward the blade portion 52,
The side corresponding to the apex angle is formed below the base 51. The through-hole 55 is formed at the center of the base 51 in the insertion direction with the one apex angle.

A guide recess 56 is formed below the through hole 55, that is, at the lower end edge of the corresponding base portion 51, that is, the end edge on the tip side in the insertion direction. It has a function of guiding to be positioned below the through hole 55.

Accordingly, when the inner blade 50 is mounted in the mounting hole 32 of the inner blade base 30 as described above, if the base 51 is positioned such that the distal end thereof corresponds to the mounting hole 32, the operating portion 34a of the spring 34 The distal end portion substantially corresponds to the guide concave portion 56. In this state, when the base portion 51 is inserted into the mounting hole 32, the distal end portion of the working portion 34a comes into contact with the edge of the guide concave portion 56 at the initial stage of insertion. Since it is pushed downward, it gradually curves along the trajectory shown by the two-dot chain line in FIGS. 7 to 10, but when the base portion 51 is inserted beyond a predetermined amount as shown in FIG. Of the guide concave portion 56 is disengaged from the edge of the guide concave portion 56, and slides into contact with the surface of the base 51 as the base 51 is further inserted. When the distal end of the base corresponds to the through hole 55 provided in the base 51 as shown in FIG. Restored by The tip enters the hole 55 engages the portion of the apex angle of the through-hole 56, is urged to press the inner cutter 50 upward, that blade portion 52 on the inner surface of the outer cutter 25.

Next, the inner cutter 5 is inserted into the mounting hole 32 of the inner cutter base 30.
7 to FIG.
It will be described based on.

FIG. 7 shows the inner cutter base 3 to which the spring 34 is attached.
This shows a state before the inner blade 50 is inserted into the mounting hole 32 of No. 0. When the inner blade 50 is inserted into the mounting hole 32 from the lower end of the base 51 from this state, the edge of the guide recess 56 and the tip of the action portion 34a of the spring 34 have a corresponding relationship. In the initial stage of insertion, the distal end of the operating portion 34a abuts on the edge of the guide concave portion 56 formed in the base portion 51. With this abutment, as the insertion of the base advances, the operating portion 34a gradually curves as shown in FIG. The tip moves along a trajectory shown by a two-dot chain line in the figure. Then, when the insertion of the base portion 51 further proceeds and the insertion amount exceeds a predetermined amount, the distal end comes off the edge of the guide concave portion 56 as shown in FIG. Then, when the insertion of the base 51 further proceeds in a state where the tip is disengaged from the edge of the guide recess 56, the tip is inserted into the through hole 55.
And corresponding. As described above, the tip of the action portion 34a is
In response to FIG. 5, the action portion 34a is restored by its own elastic force, and with this restoration, its tip enters the through hole 56 and engages with the through hole 56, that is, the apex angle portion, as shown in FIG. The inner blade 50 is urged upward. Thus, the blade portion 52 of the inner cutter 50 is pressed against the inner surface of the outer cutter 25. As described above, the inner cutter 50 is automatically attached to the inner cutter base 30 by inserting the base 51 into the attachment hole 32.

Then, the inner cutter base 30 to which the inner cutter 50 is attached is housed in the outer cutter frame 20 as described above, and
By attaching the outer blade 20 to the installation chamber 10 of the front case 1a while coupling the zero coupling 31 to the coupling 3, the inner blade base 30 is mounted to the main body case 1 together with the outer blade frame 20. When the inner blade 50 is attached to the installation chamber 10, the blade 52 of the inner blade 50
3, the blade 52 is pressed against the inner surface of the outer blade 25 by the motor 2 when the inner blade base 50 is driven to rotate by the motor 2 in this state. While rotating or sliding, the beard introduced from the beard introduction hole 27 of the outer blade 25 is cut and shaved.

Since the engaging portion formed on the base 51 of the inner cutter 50 is formed as the through-hole 55 penetrating the base 51 in this manner, it is possible to prevent the strength of the base 51, that is, the inner cutter from lowering. Further, since the guide concave portion 56 is formed below the lower end edge of the base portion corresponding to the through hole 55, the action portion 34a of the spring 34 can be guided and positioned at a position corresponding to the through hole 55. Further, the spring 34 is attached to the mounting hole 3 of the base 51.
Until the amount of insertion into the cartridge 2 exceeds the predetermined amount, the tip of the working portion 34a contacts the edge of the guide concave portion 56 and pushes down the working portion 34a. By setting the length to be outside the edge of the concave portion 56 and further inserting the base portion 51 beyond the predetermined amount, the distal end portion of the action portion 34a can be engaged with the through hole 55. The attachment to the inner cutter base 30 is automatically performed only by inserting the base 51 into the attachment hole 32.

In the above embodiment, the base 5
1, the through-hole 55 is formed independently. However, the through-hole 55 is continuous with the through-hole 55 and is discontinuous with the guide recess 56, and has a slit shape having a width slightly larger than the wire diameter of the spring 34. A guide hole may be formed.
Even in such a configuration, since the guide hole is not opened at the lower end edge of the base portion 51, it is possible to prevent the strength of the base portion 51, that is, the inner blade 50 from decreasing, and to easily restore the spring 34 by its own elastic force. And the engagement with the through-hole 55 can be facilitated.

In the above embodiment, the through-hole 55 is formed in a substantially triangular shape. However, the present invention is not limited to the substantially triangular shape, and the through-hole may have any shape. However, in the case of a substantially triangular shape, the lower end side of the through hole 55 is large, and the apex angle is at the top, so that the positioning of the spring 34 is surely performed. When the spring is restored, the other end of the spring, that is, the tip of the working portion, can easily and reliably enter the through hole, and since the engaged spring 34 is located at the apex angle, the inner blade can be stably held. Can be pressed against the inner surface of the outer cutter.

[0033]

According to the first aspect of the present invention, the engaging portion for engaging with the spring formed in the base is formed by a through hole passing through the base, and the lower end edge of the base corresponds to the through hole. By forming the guide recess, the strength of the inner blade can be prevented from lowering, and the guide recess can guide the spring to a position corresponding to the through hole. With the end corresponding to the guide recess, the tip of the spring abuts the edge of the guide recess until the insertion amount of the base into the inner blade insertion hole exceeds a predetermined amount, and the spring bends as the base is inserted. When the amount reaches a predetermined amount, the tip is set to a length that is separated from the edge of the guide recess, and when the base is inserted beyond a predetermined amount and the through hole corresponds to the tip, the through hole is restored by its own elastic force. From what has been so as to engage, the attachment of the inner blade base of the inner cutter are those having the effect that done automatically by inserting the inner cutter attachment holes the inner cutter from its base.

According to a second aspect of the present invention, in the first aspect of the present invention, the through hole has a substantially triangular shape and one apex angle thereof is formed in the direction of the blade. In addition to the effect of the invention described in the item 1, in addition to making it easy and sure that the tip of the working portion of the spring that is restored by the elastic force enters the through hole, the engaged spring is located at the apex angle. This has the effect of pressing the inner cutter against the inner surface of the outer cutter in a stable state.

[Brief description of the drawings]

FIG. 1 is a side view of an electric shaver according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a state in which an inner blade base and an outer blade are provided in an inner blade base mounting portion of the embodiment.

FIG. 3 is an exploded view of a part of the inner blade in the perspective view of the inner blade base of the embodiment.

FIG. 4 is a plan view of the inner cutter base of the embodiment.

FIG. 5 is a plan view of the inner blade base according to the embodiment as viewed from the back surface side.

FIG. 6 is an enlarged plan view of a mounting hole of the inner cutter base according to the embodiment.

FIG. 7 is an explanatory view showing how to mount the inner blade to the inner blade base of the embodiment, and is a view showing a state before the inner blade is mounted, and FIG. 7 (A) is a cross-sectional view in the longitudinal direction of the mounting hole. Figure, (B)
Is a cross-sectional view in a direction perpendicular to the longitudinal direction of the mounting hole (a cross-sectional view taken along line XX in (A)).

FIG. 8 is an explanatory view showing how to mount the inner blade to the inner blade base according to the embodiment, and shows a state where the inner blade is inserted into the mounting hole until a predetermined insertion amount is not reached; ) Is a cross-sectional view in the longitudinal direction of the mounting hole, (B) is a cross-sectional view in a direction orthogonal to the longitudinal direction of the mounting hole (cross-sectional view taken along line XX in (A)).
It is.

FIG. 9 is an explanatory view showing how to attach the inner blade to the inner cutter base according to the embodiment, and shows a state where the inner blade is inserted into a mounting hole beyond a predetermined amount, and FIG. FIG. 4B is a cross-sectional view in a direction perpendicular to the longitudinal direction of the mounting hole (a cross-sectional view taken along line XX in FIG. 4A).

FIG. 10 is an explanatory view showing how to attach the inner blade to the inner blade base of the embodiment, and is a view showing a state in which a tip portion of a spring is engaged with a through hole; FIG. FIG. 7B is a cross-sectional view in a longitudinal direction, and FIG. 7B is a cross-sectional view in a direction orthogonal to the longitudinal direction of the mounting hole (a cross-sectional view taken along line XX in FIG. 7A).

FIG. 11 is a diagram showing how to attach the inner blade to the inner blade base according to the embodiment, showing a state where the inner blade is mounted;
(A) is a cross-sectional view in the longitudinal direction of the mounting hole, (B) is a cross-sectional view in a direction orthogonal to the longitudinal direction of the mounting hole (XX in (A))
FIG.

FIG. 12 is a perspective view of an inner blade base of a conventional electric razor in which a part of the inner blade is exploded.

FIG. 13 is an explanatory view showing a conventional method of attaching the inner blade to the inner cutter base, and is a view showing a state before the inner blade is attached.

FIG. 14 is an explanatory view showing a conventional method of attaching an inner blade to an inner cutter base, and is a view showing a state where the inner blade is attached.

[Explanation of symbols]

 Reference Signs List A electric shaver 1 body case 2 motor 10 inner blade base installation chamber (inner blade base installation part) 20 outer blade frame 25 outer blade 30 inner blade base 32 mounting hole provided in inner blade base 34 spring (biasing spring) Reference Signs List 50 inner blade 51 base of inner blade 52 blade portion of inner blade 55 through hole (engaging portion) 56 guide concave portion

Claims (2)

[Claims] A main body case accommodating a motor therein and having an inner blade base disposition portion; an outer blade attached to the inner blade base disposition portion and having a plurality of beard introduction holes; An inner cutter base provided with an inner cutter insertion hole that is disposed in the disposition portion and is rotationally driven by the motor and penetrates in the axial direction,
A biasing spring having one end attached to the inner cutter base and the other end intersecting the inner cutter insertion hole, a base inserted into the inner cutter insertion hole, and one end of the base are provided. It has an engaging portion comprising a blade portion and engaging the spring with the base portion,
An inner blade attached to the inner blade base by urging the blade part against the inner surface of the outer blade by the urging spring, and rotating the inner blade base to slidably contact the inner surface of the outer blade. In the rotary electric shaver, the engaging portion is formed by a through hole penetrating the base, and a guide recess is formed at a lower end edge of the base corresponding to the through hole, and the other end of the spring is provided. Correspond to the guide recess formed in the base inserted into the inner blade insertion hole, and the length of the spring is adjusted at the other end until the insertion amount of the base into the inner blade insertion hole reaches a predetermined amount. When the distal end abuts against the edge of the guide concave portion and curves as the base is inserted and the insertion amount exceeds a predetermined amount, the distal end of the other end is set to be separated from the edge of the guide concave portion, and the base exceeds the predetermined amount. The tip of the other end corresponds to the through hole Electric rotary shaver, characterized in that engaging in the through-hole by the restoring of the elastic force of the self-can. 2. A rotary electric shaver according to claim 1, wherein said through-hole is formed in a substantially triangular shape, and one apex angle thereof is formed as a blade direction.