JP2641950B2 - Electric razor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a reciprocating electric shaver.

[Prior art] Conventional reciprocating electric razors are described in, for example,
As described in No. 36221, in a case provided with an outer blade on the upper part, the motor is arranged so that its rotating shaft projects toward the outer blade, and an eccentric cam is attached to the rotating shaft of the motor, By inserting the output shaft of the eccentric cam into a long hole of the vibrator attached to the inner blade arranged inside the outer blade, the rotational motion of the motor is converted into a reciprocating motion to reciprocate the inner blade. It has become.

[Problems of the prior art] However, in such a conventional electric shaver,
The thickness of the case depends on the outer diameter of the motor, and if a motor having a small outer diameter is used, a sufficient torque (elasticity) cannot be obtained.

[Object of the Invention] The present invention has been made in view of the above circumstances,
An object of the present invention is to provide an electric shaver that can obtain a sufficient torque (shaving force) even when the electric shaver is made thin.

SUMMARY OF THE INVENTION In order to achieve the above-described object, the present invention provides a case in which an outer blade is provided on an upper portion, and a case in which the axial dimension of a rotating shaft is smaller than the radial dimension of the rotating shaft. A flat motor arranged at a position corresponding to one side of the outer cutter in the case with an axial direction of the shaft being the thickness direction of the case, and a large gear attached to a rotating shaft of the flat motor A metal eccentric cam disposed at a position corresponding to the other side of the outer cutter in the case beside the flat motor, and formed integrally with the eccentric cam by a synthetic resin; A small gear that rotates by transmitting the rotation,
A swing lever that is arranged at a position corresponding to the other side of the outer cutter in the case next to the flat motor, and converts a rotational movement of the eccentric cam into a swing movement, and a case below the outer cutter. The main point is that the oscillator includes a vibrator that is disposed inside and is reciprocated by the swing lever, and an inner blade that is disposed inside the outer blade and is reciprocated by the reciprocating motion of the vibrator.

Hereinafter, the present invention will be described in detail with reference to examples.

FIG. 1 shows the internal structure of an electric shaver according to one embodiment of the present invention, and FIGS. 2 and 3 show the appearance of the electric shaver.

The electric shaver case includes a main body case 1 and an outer blade case 2 which is detachable from the main body case 1 as described later. The main body case 1 has a structure in which a case half 3 made of an aluminum alloy plate by die casting and a case half 4 in which a synthetic resin frame is attached to the inner surface of the aluminum alloy plate are screwed together. (See FIG. 5).

A flat motor 11 is housed on the left side of the upper half in the main body case 1 in FIG. As shown in FIG. 4, the flat motor 11 has a flat motor case 12 on which a disk-shaped bracket 13 is mounted, and a ring-shaped magnet 14 mounted on the upper surface of the bracket 13. A flat rotor 15 having a coil integrated therewith is disposed between the motor 15 and the inner surface of the motor case 12. One end of a rotating shaft 16 of the rotor 15 is pivotally mounted on the upper surface of the bracket 13,
The other end of the brush 16 projects outside through a bearing 17 provided in the motor case 12, and a commutator 18 attached to the lower surface of the rotor 15 and a brush attached to the upper surface of the bracket 13 via a brush base 19. A rectifier comprising 20 is arranged in the center space of the magnet 14. As shown in FIG. 1, the flat motor 11 is housed in the main body case 1 in a state where the axial direction of the rotating shaft 16 is set to the thickness direction of the main body case 1 (the left-right direction in FIG. 3). .

A large gear 21 made of metal is attached to the rotating shaft 16 of the flat motor 11. The large gear 21 is meshed with a small gear 22 made of synthetic resin. As shown in FIG. 5, the small gear 22 is integrally provided with a metal eccentric cam 23 by insert molding. The small gear 22 and the eccentric cam 23 are rotatably mounted on a shaft 24 provided on one case half 4 of the main body case 1. The eccentric cam 23 is fitted in a long hole 26 provided at one end of a lever 25 made of synthetic resin. A central portion of the lever 25 is rotatably attached to a shaft portion 27 provided on one case half 4 of the main body case 1. A column 28 is provided below the other end of the lever 25 in FIG. Here, the eccentric cam 23 and the lever
25 constitutes a motion conversion mechanism.

The cylindrical portion 28 of the lever 25 is fitted in an elongated hole 32 provided in a vibrator 31 made of synthetic resin. The vibrator 31 has a long vibrator main body 33 having rigidity and a protruding piece having the long hole 32 provided at a lower right portion of the vibrator main body 33 in FIG.
34, a substantially U-shaped elastic arm 35 provided at both ends of the vibrator body 33, a mounting portion 36 provided at the tip of these elastic arms 35, and a lower central part of the vibrator body 33 And a flat connecting plate 38 provided at the upper center of the vibrator main body 33, and a long groove 39 provided at the center of the connecting plate 38. The vibrator 31
The vibrator main body 33 is arranged in the main body case 1 and the connecting plate
With the long groove 39 part protruding from the opening 40 provided in the upper part of the main body case 1, the two mounting portions 36 are attached to the main body case 1.
In FIG. 1, both elastic arms 35 are arranged so as to be able to reciprocate in the left-right direction because they are fitted into mounting grooves 41 provided on both sides of the upper part thereof, and both elastic arms 35 are elastically deformable. The lower limit position of the vibrator 31 is regulated by the slidable contact of the protrusion 37 with the flat upper surface of the protrusion 42 provided on the one case half 4 of the main body case 1.

An inner blade block 43 is attached to the connecting plate 38 of the vibrator 31. The inner cutter block 43 is configured as shown in FIGS. 1, 6, and 7. That is, the inner blade block
43 has a blade mount 44. The blade mount 44 is formed of a synthetic resin, and side plates 44c and 44d are provided between left and right ends of the front plate 44a and the rear plate 44b, and pin mounting holes 44e and 44f are provided in the lower center of the front plate 44a and the rear plate 44b. The pin mounting holes 44e, 4
It has a structure in which middle plates 44g and 44h are provided between the front plate 44a and the rear plate 44b on both sides of 4f. A plurality of inner blades 45 are mounted in parallel on the upper part of the blade mount 44. Blade mount 44
Pins 46 are mounted in the pin mounting holes 44e and 44f. The inner blade block 43 is attached to the connecting plate 38 with a certain amount of play because the pin 46 is fitted into the long groove 39 of the connecting plate 38 of the vibrator 31 in a state where the pin 46 is prevented from coming off.

A flat elliptical coil spring 47 for urging the inner cutter block 43 upward is attached to the connecting plate 38 between the pin 46 of the inner cutter block 43 and the upper surface of the transducer main body 33 of the transducer 31. Have been. A flexible packing 48 is provided on the upper part of the main body case 1. The packing 48 is attached to the main body case 1 while avoiding interference with the coil spring 47.
The opening 40 is closed to prevent the cut pieces of the beard from entering the main body case 1.

In the lower half in the main body case 1, two storage batteries 51 having a rectangular flat shape are stored. The negative electrode of the lower storage battery 51 is an electrode plate 52
Is connected to the positive electrode of the storage battery 51 on the upper side. The negative electrode of the upper storage battery 51 is an electrode plate 53, a wiring board 54, and a lead wire 55.
One brush 20 of the flat motor 11 through the shaft (see FIG. 4)
It is connected to the. The other brush 20 of the flat motor 11 is connected to one terminal of a switch 57 via a lead wire 56. The other terminal of the switch 57 is a lead wire 58, a wiring board 5
9. It is connected to the positive electrode of the lower storage battery 51 via a leaf spring 61 and an electrode plate 62 which constitute one terminal of a circuit block 60 provided with charging and electronic components. The circuit block 60
The jack 63 constituting the other terminal of the wiring board 64, the wiring board
It is connected to the negative electrode of the upper storage battery 51 via the 54 and the electrode plate 53. An operation button 66 is attached to a slider 65 of the switch 57. The operation button 66 is arranged on the side of the main body case 1 so as to be slidable in the vertical direction.

Lock buttons 71 are provided on both upper sides of the main body case 1 so as to be slidable in the left-right direction. The lock button 71 is urged in a direction protruding from the side of the main body case 1 by the force of the coil spring 72 in a state where the lock button 71 is prevented from coming off. A locking piece 73 with a taper is provided above the lock button 71. Usually, the tapered portion of the locking piece 73 is
Protruding from the side of. Guide portions 74 are provided on the upper sides of the main body case 1 above the locking pieces 73.

On the other hand, the outer cutter case 2 is formed of an aluminum alloy by die casting as shown in FIGS. 1 to 3 and FIGS. 8 to 12. That is, the outer blade case 2
A case body 81 having a substantially semi-cylindrical headed hollow shape, an opening 82 provided at the center of the head of the case body 81, and a recess 83 on the inner surface of the case body 81 in the case body 81 on both sides of the opening 82. A thin position restricting portion 84 formed by being provided, a front protruding portion 85 having a flat upper surface provided at the lower part of the front inner surface of the case main body 81, and a case main body 81
Rear protruding part provided on the lower part of the rear inner surface and having a flat upper surface
86, a rectangular projection 87 provided at the upper center of the rear protruding portion 86, and a rectangular locking concave portion 88 provided at the lower portion of the inner surface of both sides of the case body 81. I have.

An outer blade 91 is attached to the outer blade case 2. Outer blade
91 has an edge 91a in contact with the flat upper surface of the rear protruding portion 86 of the outer blade case 2 and a rectangular cutout 91b provided at the center of the one edge 91a is formed in a square shape of the outer blade case 2. One end edge in the positioned state by being fitted into the projection 87 of
A plurality of locations 91c near the 91a are attached to the inner surface of the case body 81 of the outer cutter case 2 by spot welding (or bonding or the like), and the left and right side portions 91d are attached to the inner surface of the thin position regulating portion 84 of the outer cutter case 2. By being along, it is curved in an arch shape. The other end edge 91e of the outer cutter 91 is normally slidably abutted on the inner surface of the outer cutter case 2 at a predetermined interval above the flat upper surface of the front protruding portion 85 of the outer cutter case 2, and is free. It is in a state. And on use,
When pressure is applied to the outer blade 91, the other edge 91
As e descends along the inner surface of the outer cutter case 2,
The outer blade 91 moves to the inside of the outer blade case 2 and the other edge of the outer blade 91
When the outer blade 91e contacts the flat upper surface of the front protruding portion 85 of the outer blade case 2, the outer blade 91 is prevented from moving inside the outer blade case 2.

Outer blade case 2 with electric razor constructed as above
When attaching the outer blade case 2 to the main body case 1, the case body 81 of the outer blade case 2 is put on both guide portions 74 of the main body case 1, and the locking pieces 73 of the lock button 71 are used for locking the outer blade case 2. The outer blade case 2 is locked to the concave portion 88, and thus the outer blade case 2 is attached to the main body case 1. When the outer cutter case 2 is not used with the outer cutter case 2 attached to the main body case 1, a cap 92 (see FIG. 2) made of a synthetic resin may be put on the outer cutter case 2. On the other hand, when removing the outer blade case 2 from the main body case 1 in order to remove, for example, cut pieces of the whiskers accumulated in the outer blade case 2, when the two lock buttons 71 are simultaneously pressed, the locking pieces of the lock button 71 are pressed. 73 comes off the locking recess 88 of the outer blade case 2, and the outer blade case 2 can be removed from the main body case 1.

Next, when using this electric razor,
When the switch 57 is turned on by operating 66, power is supplied from the storage battery 51 to the flat motor 11, and the flat motor 11 starts rotating. The rotation of the flat motor 11 is transmitted to the eccentric cam 23 via the rotating shaft 16, the large gear 21, and the small gear 22, and the eccentric cam 23 rotates. When the eccentric cam 23 rotates, the eccentric cam 23 and the lever
The lever 25 swings about the shaft 27 by the engagement with the long hole 26 of the 25. When the lever 25 swings, the vibrator 31 reciprocates left and right due to the engagement between the cylindrical portion 28 of the lever 25 and the elongated hole 32 of the vibrator 31, and the inner blade block 43 reciprocates left and right accordingly. Move. When the body blade block 43 reciprocates left and right, the beard is cut between the inner blade 45 and the outer blade 91 that reciprocate with the reciprocation.

By the way, in this electric shaver, the flat motor 11 is arranged in the main body case 1 so that the rotation axis 16 thereof is in the thickness direction of the main body case 1 (left and right direction in FIG. 3), and That is, since the motion conversion mechanism including the eccentric cam 23 and the lever 25 is arranged at a position where the flat motor 11 does not overlap, even if a flat motor 11 having a large outer diameter is used, the motor can be made thinner. However, sufficient torque (shaving force) can be obtained. Further, the height of the electric shaver is considerably reduced as compared with the case where a motion conversion mechanism including the eccentric cam 23 and the repeller 25 is arranged between the flat motor 11 and the vibrator 31 in the height direction of the electric shaver. Can be.

Incidentally, as the flat motor 11, the outer diameter of the motor case 12 is 29 mm, the thickness of the motor case 12 is 6.2 mm,
The protrusion length of the rotating shaft 16 protruding from the motor case 12 is 1.
If you use a 2mm one, this electric razor cap 92
Height except for 85.5mm, width 54mm, thickness 8.2mm, height and thickness can be considerably reduced. The upper end of the outer blade 91 is curved into an arc having a radius of 2.5 mm.

In addition, the rotation speed of the flat motor 12 as described above is 6000 rpm
Assuming that the pitch circle diameter of the large gear 21 is 26 mm, the number of teeth is 104, and the pitch circle diameter of the small gear 22 is 14.5 mm and the number of teeth is 58, the frequency of the inner blade 45 becomes about 10760, and sufficient torque is obtained. (Shaving power) can be obtained.

Furthermore, in this electric shaver, a large gear 21 is mounted on the rotating shaft 16 of the flat motor 11 instead of the eccentric cam 23, and the rotation of the large gear 21 forms a metallic eccentric cam 23 integrally therewith. Since it is rotated together with the resin small gear 22, even if the metal eccentric cam 23 is heavy, the vibration caused by the eccentric rotation of the heavy eccentric cam 23 causes the rotation shaft of the flat motor 11 to rotate.
16 can be prevented from being applied as a radial force. Therefore, even if the flat motor 11 that is weak against the radial force is used, the flat motor 11 can be prevented from being damaged.

[Effects of the Invention] As described above, according to the present invention, the flat motor is disposed in the case such that the axial direction of the rotating shaft thereof is in the thickness direction of the case, and the flat motor is arranged laterally, that is, flat. Since the eccentric cam and the oscillating lever for converting the rotational motion of the flat motor into the oscillating motion are arranged at positions not overlapping with the motor, even if a flat motor having a large outer diameter is used,
The thickness can be reduced, and hence the thickness can be reduced to obtain a sufficient torque (shaving force). Also, since the eccentric cam and the swing lever are arranged beside the flat motor, compared with the case where the eccentric cam and the swing lever are arranged between the flat motor and the inner blade in the height direction of the electric shaver. ,
The height of the electric razor can be considerably reduced.
Further, the arrangement position of the flat motor can be freely selected to some extent, and the degree of freedom in design can be increased.
Further, the rotation of the large gear attached to the rotating shaft of the flat motor rotates the metal eccentric cam together with the synthetic resin small gear formed integrally therewith, so that the metal eccentric cam is Even if it is heavy, it is possible to prevent the vibration caused by the eccentric rotation of this heavy eccentric cam from being applied to the rotating shaft of the flat motor as a radial force, and therefore even if a flat motor weak in radial force is used, The flat motor can be prevented from being damaged.

[Brief description of the drawings]

1 to 12 are views for explaining one embodiment of the present invention, in which FIG. 1 is a front view showing the internal structure of an electric shaver, FIG. 2 is a front view of the appearance of the electric shaver, Third
FIG. 4 is a side view of the appearance of the electric shaver, FIG. 4 is a cross-sectional view of the flat motor, FIG. 5 is a cross-sectional view taken along the line VV in FIG. 1, FIG. FIG. 8 is a bottom view of the inner cutter block, FIG. 8 is a front view of the outer cutter case, FIG. 9 is a sectional view taken along line IX-IX in FIG. 8, and FIG.
FIG. 11 is a sectional view taken along the line XI-XI in FIG. 9, and FIG. 12 is a sectional view taken along the line XII-XII in FIG. 1 ... body case, 2 ... outer blade case, 11 ... flat motor, 16 ... rotating shaft, 21 ... large gear, 22 ... small gear, 23 ...
... Eccentric cam, 25 ... Lever, 31 ... Vibrator, 43 ... Inner blade block, 45 ... Inner blade, 91 ... Outer blade.

Claims (1)

(57) [Claims] 1. A case having an outer blade provided on an upper part thereof, wherein the axial dimension of the rotating shaft is smaller than the radial dimension of the rotating shaft, and the axial direction of the rotating shaft is the thickness direction of the case. A flat motor arranged at a position corresponding to one side of the outer blade in the case in a state in which the flat motor is rotated; a large gear attached to a rotating shaft of the flat motor; A metal eccentric cam disposed at a position corresponding to the other side of the outer cutter; a small gear formed integrally with the eccentric cam by a synthetic resin and rotating by transmitting rotation of the large gear; A swing lever that is arranged at a position corresponding to the other side of the outer blade in the case next to the motor, and that converts a rotational movement of the eccentric cam into a swing movement; The swing lever is arranged Reciprocating and luck is the vibrator is disposed inside of the outer cutter, the electric shaver characterized by comprising, an inner cutter which is reciprocated by the reciprocating motion of the vibrator by.