JPH09122362A - Rotary electric shaver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety mechanism to an electric shaver with which the inner edge does not rotate when the edge is exposed to the outside. SOLUTION: An electric shaver consists of the following; the outer edge body with the outer edge, the inner edge body 25 with the inner edge 26 that is to rotate while making a contact to the inner face, the shaver main body 51 to contain the motor 60, the rotating shaft of the motor projecting from the shaver main body 51, the coupling 35 connected to the rotating shaft and fitted to the connecting shaft hole 32 situated on the back face of the inner edge body 25, and the rotation stoppers 37 and 39 that are to be connected to the coupling 35 and the inner edge body 25 and are to be fitted to the coupling 35 and the connecting shaft hole 32 respectively. Only when the outer edge is assembled to the outer edge body 53 that is integrally fitted to the shaver main body 51, the rotation stoppers 37 and 39 that are attached to the inner edge body 25 and the coupling 35 respectively are connected each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety mechanism of a rotary electric razor, and more particularly to a rotary electric razor in which an inner blade rotates only when an outer blade is attached to a razor body.

[0002]

2. Description of the Related Art A conventional rotary electric shaver has an outer blade body screwed into a razor body and an inner blade body mounted inside the outer blade body and rotating in contact with an inner surface of the outer blade body of the outer blade body. And an inner blade having.

During use, the outer blade body was loosened by screwing it into the razor body, the outer blade body was detached from the razor body, and the rotating inner blade could injure a face or the like.

Therefore, as a method for solving the above-mentioned drawbacks of the prior art, there is the invention of Japanese Patent Laid-Open No. 49-48450.

In the present invention, as shown in FIG. 7, an outer cutter body 1 in which a peripheral edge of an outer cutter 2 is fixed to an upper portion of an outer cutter frame 3, and an inner peripheral surface of the outer cutter frame 3 of the outer cutter body 1. A ring 4 having a plurality of cutouts 5 formed on the inner peripheral surface is press-fitted into the lower end portion.

Next, a plurality of projections 9 are formed on the peripheral side surface of the inner blade base 8 in correspondence with the notches 5 of the ring 4, and the inner blade body 6 rotates in contact with the inner surface of the outer blade 2. The inner blade body 6 is detachably fitted into the outer blade body 1 by elastically supporting the blade 7 and allowing the plurality of protrusions 9 to pass through the plurality of notches 5, respectively.

[0007]

As described above, in the conventional rotary electric shaver, a plurality of protrusions 9 provided on the outer peripheral surface of the inner blade body 6 are formed on the inner periphery of the outer blade body 1. Cutout 5
The inner blade body 6 is assembled in the outer blade body 1 by passing through each of them.

Therefore, even if the outer blade body 1 is detached from the razor body (not shown) during use, the inner blade body 6
Does not remain on the main body side and continues to rotate, and the inner blade body 6 is also removed at the same time while being fitted in the outer blade body 1. Therefore, the inner blade 7 was safe without damaging the face or the like.

However, taking out the inner blade body 6 from the outer blade body 1,
It can be attached alone to the rotary shaft (not shown) of the motor. For this reason, there is a problem that the inner blade 7 can be rotated in a state of being exposed, which is an incomplete safety mechanism.

The present invention has been made in view of the above points, and an object of the present invention is to provide a safety mechanism for a rotary electric shaver that does not rotate even when the inner blade is exposed.

[0011]

In order to achieve the above object, the rotary electric shaver according to claim 1 of the present invention rotates in contact with an outer blade body having an outer blade and an inner surface of the outer blade. An inner blade body having an inner blade, a razor body for accommodating the motor, and the mower provided so as to project from the razor body.
Rotating shaft of the rotor, a joint that is connected to the rotating shaft and that is fitted into a connecting shaft hole provided on the back surface side of the inner blade body, and the joint and the inner blade body are engaged with each other in the rotational direction. Rotation preventing means for the inner blade body and the joint are formed only when the detent means for mating are respectively formed in the joint and the connecting shaft hole, and the outer blade body is attached to the outer blade mounting body of the razor body. It is characterized in that they engage with each other in the rotational direction.

According to a second aspect of the present invention, there is provided a rotary electric shaver which is vertically movably arranged at an outer peripheral position of the joint so that an upper end of a clutch member biased upward by a clutch biasing member contacts the inner blade body. To move the inner blade body upward so that the inner blade body and the detent means of the joint do not engage in the rotational direction when the outer blade body is removed from the razor body. Is characterized by.

A rotary electric shaver according to a third aspect of the present invention is characterized in that the clutch member is provided with a brake member that comes into contact with the razor body when the outer blade body is removed from the razor body.

A rotary electric shaver according to a fourth aspect of the present invention is an inner blade body for urging the inner blade body upward between the upper end of the joint and the upper inner surface of the connecting shaft hole of the inner blade body. It is characterized in that a biasing member is provided.

In the structure of claim 1, when the outer blade body is removed from the razor body, the inner blade body moves upward along the fitting shaft for connection of the joint, and the detent portion of the joint and the inner blade body move. The inner blade body moves upward to a position where it does not engage with the rotation stopper receiving portion. Therefore, even when the joint rotates, the inner blade does not rotate, and the inner blade is safe without damaging the face or the like.
Also, when the outer blade body is attached to the razor body, the inner blade body moves downward, the detent portion of the joint engages with the detent receiving portion of the inner blade body, and the inner blade body does not rotate with the joint. Is the one that rotates normally.

According to a second aspect of the present invention, there is provided a clutch member which is attached to the outer peripheral surface side of the joint and which is movable upward and downward while being urged upward by a clutch spring, and the upper end of the clutch member contacts the inner blade. Installed in contact. For this reason, when the outer blade is removed from the razor body, the clutch spring moves the clutch member upward and at the same time, it moves above the inner blade to prevent the joint from rotating and the inner blade receiving portion. The inner blade moves upward to a position where is not engaged. Therefore, even when the joint rotates, the inner blade does not rotate, and the inner blade is safe without damaging the face or the like.

In the third aspect of the invention, the brake portion is integrally formed on the outer peripheral surface of the clutch member. For this reason, when the outer cutter is removed from the razor body, the clutch spring moves the clutch member upward, and the brake part presses against the lower surface of the upper wall of the razor body, causing the joint to rotate. Even if it is, the rotation does not transmit the transmission force due to the friction between the lower surface of the joint and the clutch member to the clutch member due to the break portion. Therefore, it is safer as compared with claims 1 and 2.

In the structure of claim 4, even when the inner blade spring for urging the inner blade upward is arranged between the inner blade and the joint, the same effect as that of the first aspect can be obtained. .

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

FIG. 3 is an exploded perspective view showing the structure of a rotary electric shaver according to an embodiment of the present invention.

Reference numeral 51 denotes a cylindrical razor body which is made of synthetic resin or the like and accommodates the motor 60, and has a downward opening, and an upper wall portion 54 is formed on an upper surface portion thereof. A circular through hole 55 is formed in the center of the upper wall portion 54, and mounting holes 56, 56 are formed in the middle portion. Further, an outer blade mounting body 53 provided with a screw 53a for screwing the outer blade body 20 is formed on the outer peripheral surface of the upper portion of the razor body 51.

On the upper surface of the motor 60, a motor mount 6 is attached.
A fitting boss 65 protruding in a cylindrical shape for fitting and fixing to the No. 1 is formed, and a motor rotating shaft 64 is formed so as to project from the fitting boss 65. Further, a D cut 64 having a D-shaped cross section is formed at the tip of the motor rotation shaft 64.
a is formed.

Reference numeral 61 is a disc-shaped motor mount made of synthetic resin or the like, which is mounted by engaging with the inner peripheral surface of the razor body 51, and the fitting boss 65 of the motor 60 is inserted and fitted in the center of the upper surface. The cylindrical mounting bosses 62, 62 each having a fitting hole 58 to be fitted and a screw hole 63 in the center are
The razor body 51 is formed so as to protrude from the mounting holes 56, 56, respectively.

Reference numeral 40 denotes a clutch member made of a synthetic resin or the like having a bottomed cylindrical shape having an upper opening, and a through hole 43 is formed in the center of a bottom portion 42 of the clutch member 40 as shown in FIG. Further, at a substantially central portion of the outer peripheral surface of the clutch member 40, there is provided a break portion 41 protruding outward and having a substantially triangular upper surface.

Next, a method of assembling the motor to the razor body will be described with reference to FIGS.

First, the fitting boss 65 formed on the upper surface of the motor 60 is fitted into the fitting hole 58 of the motor mounting base 61, and the motor 60 is fitted into the motor mounting base 61. Fix together.

Next, with the coil-shaped clutch spring 45 and the clutch member 40 inserted in the rotary shaft 64 of the motor, the motor mount 61 is inserted from below the razor body 51 into the clutch. The upper end of the member 40 is projected from the through hole 55 formed in the upper wall portion 54 of the razor body 51. Then, the mounting boss 6 of the motor mounting base 61
After the 2 is aligned with the mounting hole 56 of the razor body 51, the mounting screws 57 are respectively screwed into the screw holes 63 of the mounting boss 62, whereby the motor mounting base 61 is mounted and fixed to the razor body 51. Then, a bottom lid (not shown) is attached to the lower portion of the razor body 51, and the motor 60 is sandwiched between the razor body 51 and the bottom lid and stored. The clutch member 40 is biased upward by the clutch spring 45, and the brake portion 41 of the clutch member 40 contacts the lower surface of the upper wall portion 54 of the razor body 51. The clutch member 40 is attached to the razor body 51 so as to be vertically movable.

Reference numeral 35 is a joint made of synthetic resin or the like, in which a connecting fitting shaft 36 which fits in the connecting fitting hole 32 of the inner blade 25 is formed in the longitudinal direction, and a disk-shaped base portion 38 is formed at the lower end. Has been formed. The base portion 38 is inserted into the inner peripheral surface of the clutch member 40, and on the upper surface of the base portion 38, protrusion-shaped rotation stopping portions 37, 37 that engage with the rotation preventing receiving portion 39 of the inner blade body 25 are formed. Has been done. Further, in the longitudinal direction of the joint 35, the rotary shaft 64 of the motor 60 is fitted and inserted, and a fitting hole 34 corresponding to the D cut 64a is formed.

Reference numeral 28 denotes a disk-shaped inner blade base made of a molded product such as a synthetic resin, and a cylindrical fitting cylinder 31 is integrally projectingly provided at the center of the lower surface of the inner blade base 28. Furthermore, the inner blade base 2
A plurality of inner blade mounting grooves 27 are respectively formed in the outer peripheral direction of 8, and the inner blades 26 are mounted in the inner blade mounting grooves 27, and a push-up spring 29 that pushes the inner blade 26 upward is provided. Each is attached to the inner blade base 28.

Since the fitting cylinder 31 is detachably fitted in the joint 35, the fitting fitting hole for fitting the fitting fitting shaft 36 of the fitting 35 is fitted in the longitudinal center of the fitting fitting 31. 32 is formed, and at the lower end, the rotation stopping portion 3 of the joint 35 is formed.
Detent stop receiving portions 39, 39 with which 7 and 37 are respectively engaged are formed.

The inner blade body 25 includes the detent portions 37, 37 of the joint 35 fixed to the rotary shaft 64 of the motor 60 and the inner blade body 2.
5, the detent receiving portions 39, 39 provided on the fitting cylinder 31 of No. 5 engage and receive the driving force of the motor 60.

Reference numeral 20 denotes a cylindrical outer blade frame 2 having a peripheral edge portion of the outer blade 21.
It is an outer blade fixed to the upper part of 2. The generated load of the clutch spring 45 described above is equal to or more than the load required to lift the inner blade body 25 upward and when the plurality of inner blade pushing springs 29 attach the outer blade body 20 to the razor body 51. It is a value equal to or less than the generated combined load value.

Another structure for urging the inner blade body upward will be described with reference to FIG. Note that FIG. 5 is a cross-sectional view showing a state in which the outer blade body is removed from the razor body.

Reference numeral 70 denotes a fitting hole 32 for connection relating to the inner blade 25.
When the outer blade body 20 is detached from the razor body 51 with the inner blade body spring that is in contact with the upper wall of the joint 35 and is in contact with the upper end of the joint 35, the inner blade body spring 70 has a free length. Has become. Further, when the outer blade body 20 is attached to the razor body 51, the inner blade body spring 7
0 indicates a state in which the inner blade body 25 is biased upward.

Another embodiment of the engaging means for engaging the joint 35 and the inner blade body 25 will be described. FIG. 4 (A)
Shows the second embodiment, and FIG. 4B shows the third embodiment. In the second embodiment, a plurality of concave engaging concave portions 80 are provided on the upper surface of the base portion 38 of the joint 35, and the engaging concave portions 80 are provided.
A plurality of convex engaging projections 81 that engage with are formed on the lower surface of the fitting cylinder 31 of the inner blade body 25. In the third embodiment, a plurality of engagement protrusions 90 protruding in a substantially triangular shape are formed on the upper surface of the base 38 of the joint 35, and the engagement protrusions 90 are formed.
A plurality of engaging protrusions 95 each having a substantially triangular shape and engaging with each other are formed on the lower surface of the fitting cylinder 31 of the inner blade body 25. Also,
Although not shown, an engaging means may be provided which engages by providing a magnet on one side and an iron plate attracted by the magnet on the other side.

Next, the operation of the above embodiment will be described.

FIG. 1 is a sectional view showing a state in which the outer blade body is removed from the razor body.

In the state where the motor 60 and the clutch member 40 are attached to the razor body 51, the clutch member 40 is urged upward by the clutch spring 45 to be attached inside the razor body 51, and the outer periphery of the clutch member 40. The break portion 41 formed on the surface abuts on the back surface side of the upper wall portion 54 of the razor body 51 and is biased upward.

Next, the joint 3 is attached to the rotary shaft 64 of the motor 60.
5 is attached, the base portion 38 of the joint 35 becomes a brake portion 41.
Is placed in contact with the upper surface of the bottom portion 42 of the
The tip of 5 is attached so as to project from the tip of the opening of the clutch member 40.

Further, when the connecting fitting hole 32 of the inner blade body 25 is inserted and fitted into the connecting fitting shaft 36 of the joint 35 and the inner blade body 25 is attached to the joint 35, the upper open end of the joint 35 is formed. The lower end of the fitting cylinder 31 of the inner blade body 25 abuts and is attached.

In this state, the detent portion 3 of the joint 35 is
Anti-rotation receiving parts 39, 39 of the upper ends of the 7, 37 and the inner blade 25
It is attached separately from the lower end of the. Therefore, even when the joint 35 rotates, the inner blade body 25 does not rotate. Therefore, it does not damage the face. In addition, due to the frictional force between the joint 35 and the inner blade 25, the inner blade 2 should not be damaged.
Even when 5 rotates, the inner blade body 25 can be stopped with a weak force, so there is almost no risk of scratching the face or the like.

When the outer blade body 20 is screwed and attached to the razor body 51, the inner blade body 25 becomes the outer blade body 2 as shown in FIG.
It is pushed downward by the outer blade 21 of 0 and moves downward, and the clutch member 40 also moves downward against the upward biasing force of the clutch spring 45. When the inner blade body 25 moves downward, the rotation stopper receiving portions 39, 3 of the inner blade body 25
9 and the detent portions 37, 37 of the joint 35 are in the engaged state.

Therefore, when the motor 60 rotates, the driving force of the motor 60 is transmitted to the inner blade 25 through the joint 35, and the inner blade 25 rotates.

As described in claim 3, when the brake member 41 is integrally provided with the clutch member 40,
As shown in FIG. 1, when the outer blade body 21 is removed from the razor body 51, the brake portion 41 is urged upward to cause the break portion 41 to move to the rear surface of the upper wall portion 54 of the razor body 51. Is pressed by.

Therefore, the joint 35 rotates, and the frictional force between the lower end of the joint 35 and the clutch member 40 causes the frictional force between the brake portion 41 and the razor body 51 even when the clutch member 40 rotates. The clutch member 40 does not rotate. Therefore, even if the joint 35 rotates, the clutch member 4
0 does not co-rotate, and the inner blade 25 does not co-rotate.

As described in claim 4, when the inner blade spring 70 is mounted so as to be interposed between the inner blade 25 and the joint 35, as shown in FIG. 5, the outer blade is razored. When the inner blade body 70 is detached from the main body, the inner blade body spring 70 is attached in a state where the inner blade body 70 has a free length.
No upward force acts on 5.

Further, the rotation preventing portions 37, 37 of the joint 35
And the lower ends of the rotation stopper receiving portions 39, 39 of the inner blade body 25 are separated from each other. For this reason, even when the joint 35 is rotating, the inner blade 25 does not rotate, so that the face or the like is not damaged.

Next, as shown in FIG. 6, when the outer cutter is attached to the razor body, the inner cutter 25 moves downward against the inner cutter spring 70, and the inner cutter 25 moves. Anti-rotation receiving portions 39, 39 and anti-rotation portions 37, 37 of the joint 35
And are in the engaged state.

Therefore, when the motor 60 rotates, the driving force of the motor 60 is transmitted to the inner blade 25 through the joint 35, and the inner blade 25 rotates normally.

[0050]

As described above in detail, according to the present invention, when the outer blade body is removed from the razor body, the inner blade body moves upward and the joint and the inner blade body engage with each other. Since it is in a position where it is not in a condition, it can not receive the effective rotational force from the joint, and only the inner blade will rotate during the assembly work after cleaning, and the risk of injury due to contact with hands etc. can be avoided. Is.

Further, even if the outer blade body comes off from the razor body during use of the razor, the inner blade body does not receive an effective rotational force from the joint, and there is no risk of scratching the face or the like. On the other hand, when the outer blade is properly attached to the main body, the joint and the inner blade body are connected, and the inner blade body rotates normally.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where an outer blade body of a rotary razor according to an embodiment of the present invention is removed from a razor body.

FIG. 2 is a cross-sectional view showing a rotary razor according to the same embodiment.

FIG. 3 shows a structure of a rotary razor in the same embodiment, and (A) is an exploded perspective view. FIG. 6B is a perspective view showing a D-cut formed on the rotation shaft of the motor.

FIG. 4 (A) is a perspective view showing a second embodiment of another embodiment showing the engagement means between the joint and the inner blade body in the same embodiment. FIG. 9B is a perspective view showing the third embodiment.

FIG. 5 is a cross-sectional view showing another urging member for urging the joint in the same embodiment, showing a state where the outer blade body is removed from the razor body.

FIG. 6 is a cross-sectional view showing another urging member for urging the joint in the same embodiment, showing a state where the outer blade body is detached from the razor body.

FIG. 7 is a side view including an outer blade body, an inner blade body, and a ring according to a conventional technique, including (A) a partial cross-sectional view showing the outer blade body. (B) is a top view showing the inner blade. (C) is a top view showing a ring.

[Explanation of symbols]

 20 ... Outer blade body, 21 ... Outer blade, 25 ... Inner blade body, 26 ... Inner blade, 32 ... Connection shaft hole, 35 ... Joint, 37 ... Rotation stop portion (rotation stop means), 39 ... Rotation stop receiving portion (Rotation preventing means), 40 ... Clutch member, 41 ... Brake part, 45 ... Clutch spring (clutch biasing member), 51 ... Razor body, 53 ... Outer blade mounting body, 60 ... Motor, 64 ... rotating shaft, 70 ... spring for inner blade (biasing member for inner blade).

Claims (4)

[Claims] 1. An outer blade body having an outer blade, an inner blade body having an inner blade rotating in contact with an inner surface of the outer blade, a razor body for accommodating a motor, and a razor body protruding from the razor body. A rotating shaft of the motor, a joint that is connected to the rotating shaft and that is fitted into a connecting shaft hole provided on the back surface side of the inner blade, and the joint and the inner blade. The inner blade body and the joint are respectively formed only when the outer blade body is attached to the outer blade mounting body of the razor body by forming rotation preventing means which engage with each other in the rotational direction in the joint and the connecting shaft hole, respectively. A rotary electric shaver, characterized in that the detent means of the two are engaged with each other in a rotational direction. 2. An outer blade body, which is disposed at an outer peripheral position of the joint so as to be vertically movable, and is provided so that an upper end of a clutch member biased upward by a clutch biasing member is brought into contact with the inner blade body. The inner blade body is moved upward so that the inner blade body and the detent means of the joint do not engage with each other in the rotational direction when the is removed from the razor body. Rotary electric razor. 3. The rotating member according to claim 1, wherein the clutch member is provided with a brake member that comes into contact with the razor body when the outer blade body is removed from the razor body. Type electric razor. 4. An inner blade urging member for urging the inner blade upward is provided between an upper end of the joint and an inner surface of an upper end of a joining shaft hole of the inner blade. The rotary electric razor according to claim 1.