JPS63217Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electric shaver in which a rotary or vibrating blade unit is detachably attached to a main body case having a driving source.

Conventionally, as this type of electric shaver, there is one in which a rotary or vibrating blade unit is fastened and fixed to a main body case via bayonet coupling means. The bayonet coupling means engages and disengages the engaged piece provided on the blade unit side with the engaging piece provided on the main body case side between the mating surfaces of the blade unit and the main body case, To engage and disengage, either firmly grasp the blade unit with one hand and the main body case with the other hand, and rotate either the blade unit or the main case around the central axis of the main body case, or both in opposite directions. It has to be rotated. However, many blade units have shapes that are difficult to grip, and especially in women's electric razors, it is extremely troublesome for women to engage and release the blades. There was a risk that the blade could be deformed or damaged by the hand gripping it, or if the vibrating blade unit had a vibrating blade unit, the blade tip could injure the hand.

This invention focuses on this fact and provides an electric shaver in which the bayonet coupling means between the mating surfaces of the rotary or vibrating blade unit and the main body case can be easily and safely engaged and disengaged with a one-touch operation. This is what I am trying to do.

The details will be explained below based on the drawings.

FIGS. 1 and 2 illustrate an electric shaver according to this invention, which includes a main body case 1 having a waterproof structure, a drive unit 2 built into the main body case 1, and an electric shaver that is replaceably attached to the drive unit 2. It consists of a rotating or vibrating blade unit 3.

Structure of the main body case 1 In FIGS. 3 and 4, the main body case 1 is entirely integrally molded from plastic, and includes a cylindrical grip portion 1a and a bowl-shaped head portion 1b connected to the upper end of the grip portion 1a. It consists of. The head portion 1b is inclined forward by a certain angle θ with respect to the central axis S of the grip portion 1a, and the drive unit 2 is installed therein from above. A battery 6 is housed in the grip portion 1a through the bottom opening 5, and the bottom opening 5 is closed with a bottom cover 8 screwed thereto via a waterproof O-ring 7. Inside the main body case 1, an anode plate 10 is assembled to a partition wall 9 that partitions the inside of the head part 1b and the inside of the grip part 1a, and the battery 6
The anode terminal contacts the anode plate 10. Further, a lead terminal 11 is attached along the inner wall surface of the grip portion 1a, the upper end 11a of the lead terminal 11 passes through the partition wall 9 and faces the inside of the head portion 1a, and the lower end of the lead terminal 11 is provided with a conical coil spring. Cathode spring 1
2 are connected in a flexible manner. The cathode spring 12 is received and supported by the inner surface of the bottom cover 8, and the battery 6
contact the cathode surface of the

Structure of Drive Unit 2 In FIG. 9, the drive unit 2 includes a top cover 14 fitted to the head portion 1b of the main body case 1, a motor 13 fitted to the top cover 14, and a top cover 1
4 and a blade unit attachment/detachment operation ring 16.

The upper lid 14 is entirely made of plastic, has an opening 17 formed in the center thereof, and has a cylindrical motor case 18 integrally provided at the center of the lower surface of the upper lid 14 so as to project downward. As shown in FIGS. 3 and 4, the motor 13 is fitted into the motor case 18 from below in the upper cover 14, and the output shaft, ie, the drive shaft 19, of the motor 13 is caused to protrude upward from the opening 17. A gap between the drive shaft 19 and the inner periphery of the opening 17 is closed with a waterproof seal packing 20 to prevent water from entering the motor case 18. Motor case 1
A blade unit attachment/detachment operation ring 16 and a switch operation ring 15 are fitted into the outer periphery of the blade unit 8 so as to be vertically arranged. Then, the upper cover 14 is connected to the motor 1 in this way.
3. The switch operation ring 15 and the blade unit attachment/detachment operation ring 16 are assembled in advance and then assembled into the head portion 1b of the main body case 1. By this assembly, the motor case 18, the switch operation ring 15, and the blade unit attachment/detachment operation ring 16 are housed inside the head portion 1b, and the lower surface of the peripheral edge of the top cover 14 is received and supported by the upper edge of the opening of the head portion 1b. At the same time, the lower edge of the opening of the motor case 18 is received and supported by the motor case receiving protrusion 21 erected on the inner bottom surface of the head portion 1b via the waterproof O-ring 22, and the anode terminal 13a on the lower end surface of the motor 13 is supported. comes into pressure contact with the anode plate 10. Further, the drive shaft 19 is set to coincide with the central axis of the head portion 1b and tilted forward at the above-mentioned inclination angle θ with respect to the central axis S of the grip portion 1a.

After assembly, the top cover 14 is integrally connected to the main body case 1 by passing tapping screws 25 through holes 23 formed in several places and screwing them into bosses 24 on the inner surface of the head portion 1b. The head of the tapping screw 25 is sunk flush with the top surface of the upper cover 14.

In FIG. 9, the switch operating ring 15 is entirely made of plastic, has an inner diameter slightly larger than the outer diameter of the motor case 18, and is elastically deformable from one side edge of a notch 26 in a part of its inner circumference. A rotary moderation arm 27 is extended in a cantilevered manner in the circumferential direction, and an inward protrusion 2 is provided at the tip of the rotation moderation arm 27.
7a is provided. An operation knob 28 is integrally formed on a part of the outer periphery of the ring 15.
5, a shutter opening/closing pin 35 is integrally formed on the upper surface side, and a switch pin operating cam piece 29 is integrally formed on the lower surface side. The cam piece 29 is the switch pin pressing part 2
9a and a pressure release portion 29b.

Similarly, in FIG. 9, the blade unit attachment/detachment operation ring 16 is also entirely molded of plastic and has an inner diameter that is the same as the inner diameter of the switch operation ring 15, and has a bayonet connecting means on its upper surface side. A pair of engaging pieces 31 having tapered grooves 30 are provided to protrude and face each other. Further, on the outer periphery of the ring 16, there is an operating knob 32, and an elastically deformable rotary moderation arm 34 extends in a cantilevered manner in the circumferential direction from one side edge of a notch 33 in a part of the outer periphery.
An outward protrusion 34a is provided at the tip of the arm 34.

In FIGS. 3 to 6, these blade unit attachment/detachment operation ring 16 and switch operation ring 15 are shown.
As described above, the shutter opening/closing pins 35 protruding from the switch operating ring 15 are stacked one on top of the other, and the shutter opening/closing pin 35 is connected to the blade unit attachment/detachment operating ring 1.
It protrudes upward from a pin groove 36 opened at 6. These rings 15 and 16 are rotatably fitted onto the motor case 18, and each ring 15 and 1
The operation knobs 28 and 32 of No. 6 are provided with a notch 37 formed at the upper edge of the opening of the head portion 1b of the main body case 1.
Each of them faces outward from 38. Also, the shutter opening/closing pin 35 of the switch operation ring 15 and the engagement pieces 31, 31 of the blade unit attachment/detachment operation ring 16
protrude upward from the pin groove 39 and the engagement piece grooves 40, 40, which are opened in the upper lid 14, respectively. The blade unit attachment/detachment operation ring 16 brings the outward protrusion 34a of the rotary moderation arm 34 into elastic contact with the inner surface of the head portion 1b of the main body case 1 in a slidable manner.

In FIG. 6, the switch operation ring 15 connects the inward protrusion 27a of the rotary moderation arm 27 to the first engagement groove 41, which is cut at a predetermined pitch in the circumferential direction on the circumferential surface of the motor case 18. It can be freely engaged and disengaged from the second engagement groove 42 and the third engagement groove 43, and in the normal state, the first engagement groove 41 is in the switch-off position, and in the initial stage, the second engagement groove 42 is in the switch-on position.
In the second stage, the shutter is switched to the open position using the third engagement groove 43 and is rotatable.

3 and 6, an open/close switch pin 44 is provided at a predetermined position on the circumferential surface of the motor case 18 facing the switch pin operation cam piece 29 of the switch operation ring 15 so as to be movable in the radial direction. A motor cathode switch terminal 45 formed by a plate spring is interposed between the inner surface of the motor case 18 and the motor 13 so that the movable contact 45a extends downwardly of the motor case 18 and moves toward and away from the upper end 11a of the lead terminal 11. Ru. Now, the switch operation ring 15 is connected to the inward protrusion 2 of the rotary moderation arm 27.
In the normal state where the switch pin operating cam piece 29 is in the switch-off position where the pin 7a is engaged with the first engagement groove 41, the switch pin operating cam piece 29
The switch pin press release portion 29b is located at the outer end 44a of the open/close switch pin 44 to bring the open/close switch pin 44 into a non-pressed state, so that the movable contact 45a of the switch terminal 45 is separated from the upper end 11a of the lead terminal 11. When the switch operation ring 15 is in the switch-on position and the shutter open position in which the inward protrusion 27a of the rotary moderation arm 27 is engaged with the second engagement groove 42 and the third engagement groove 43,
Since the switch pin operating cam piece 29 pushes the open/close switch pin 44 inward into the motor case 18 with the switch pin pressing part 29a, the switch terminal 45 receives the pressing force of the pin 44 and moves the movable contact 45.
a comes into contact with the upper end 11a of the lead terminal 11 to turn on the switch.

Structure of Blade Unit 3 The blade unit 3 shown in FIGS. 1 to 4 includes a circular hair catcher 46, a rotary inner cutter 48 mounted on the hair catcher 46 via an inner cutter holder 47,
and a dome-shaped mesh outer cutter 50 mounted on the hair receiving tray 46 via an outer cutter holder 49.
The hair catcher 46 has a boss 51 at the center of the inner bottom surface, and the inner cutter holder 47 is rotatably inserted into the boss 51, and a screw 52 is attached to the inner peripheral surface of the peripheral wall 46a of the hair catcher 46, which has an inverted V-shaped cross section. is carved, and the outer blade holder 49 is removably screwed into this screw 52. This blade unit 3 is designed so that water accumulated in the hair receiving tray 46 during washing can be discharged from a drainage hole 53 opened in a part of the peripheral wall 46a.

A circular bottom plate 54 is integrally joined to the outer bottom side of the hair receiving tray 46 with screws 55. As shown in FIG. 9, a substantially rectangular alignment hole 5 is formed in the diameter direction of the bottom plate 54.
6 is opened, and wedge-shaped engaged pieces 57, which constitute bayonet coupling means, are provided at mutually facing corners in the alignment hole 56.

In FIGS. 7 to 9, an opening 58 that matches the drainage hole 53 and a blind wall portion 59 are provided in the gap between the part of the peripheral wall 46a of the hair receiving tray 46 where the drainage hole 53 is opened and the bottom plate 54. A shutter 60 having an L-shaped cross section is provided so as to be slidable with a constant stroke in the circumferential direction. The shutter 60 is always urged to close by a spring 61 so as to close the drain hole 53 with the blind wall portion 59. A shutter operation port 62 is opened in a portion of the bottom plate 54 facing below the shutter 60.

Mounting operation of the blade unit 3 When appropriate, attach the rotary blade unit 3 to the top cover 14.
To attach it to the top, use the alignment hole 5 in the bottom plate 54
6 is fitted into a substantially rectangular alignment protrusion 75 (see FIG. 9) provided on the upper surface of the upper cover 14 in the diametrical direction for alignment, and the drive shaft 19 protruding from the center of the upper cover 14 is aligned with the boss. 51 and drive shaft 19.
The inner cutter holder 49 is coupled to the drive shaft 19 via the drive element 76 that is fitted and fixed thereon. At the same time, the shutter opening/closing pin 35 protruding from the upper lid 14 is fitted into the shutter operation opening 62, and the engaging pieces 31 of the blade unit attachment/detachment operation ring 16 protruding from the upper lid 14 are inserted into the alignment hole 56 at the bottom of the blade unit 3.
It fits into the diagonal portion adjacent to the engaged pieces 57, 57 inside. After that, when the blade unit attachment/detachment operation ring 16 is slid in the circumferential direction by a certain stroke using the operation knob 32, the engagement pieces 31, 31 integrated with the ring 16 rotate together, and the blades are inserted into the tapered grooves 30, 30. The engaged piece 57 at the bottom of the unit 3
57 engages, and the blade unit 3 is bayonet connected to the top cover 14.

Under this installed state of the blade unit 3, the sixth
In the figure, first, when the operation knob 28 is slid one step in the sliding direction A together with the switch operation ring 15, the switch pin operation cam piece 29 presses the open/close switch pin 44, so that the movable contact 45a of the switch terminal 45 moves to the lead terminal 11. top end 1
1a, the motor 13 is driven, and the inner cutter 48 rotates.

When washing with water, if the operation knob 28 is slid one more step in the sliding direction A together with the switch operation ring 15, the shutter opening/closing pin 35, which is integrated with the ring 15, comes into contact with one end of the shutter 60 in the closed state. It is pushed against the spring 61, and the opening 58 of the shutter 60 and the drain port 53 are aligned, so that the drain port 53 is in an open state. With the drain port 53 in the open state and the inner cutter 48 in the driven state, tap water is poured into the numerous hair introduction holes of the outer cutter 50 to remove hair that has adhered to the inner cutter 48 or accumulated in the hair receiving tray 46. The debris is washed away from the drain port 53 along with water. After washing, slide the operation knob 28 together with the switch operation ring 15 in the opposite direction and return it to the original switch-off position, the motor 13 will stop, and the shutter 60 will release the spring 61 as the shutter opening/closing pin 35 retreats. The force returns to the original position, and the blind wall portion 59 closes the drain port 53.

Detachment operation of the blade unit 3 Move the blade unit attachment/detachment operation ring 16 to the operation knob 32
When you slide it in the opposite direction to the above, ring 1
The engaging pieces 31, 31 integral with the blade 6 move in the same direction, and the engaged pieces 57, 57 are pulled out from the tapered grooves 30, 30 of the engaging pieces 31, 31, and the rotary blade unit 3 will be removed from the top cover 14.

Other modified embodiments of the blade unit 4 FIGS. 10 to 12 show a vibrating blade unit 3, which has a cap-shaped blade holder 63 and a bottom opening of the blade holder 63. a bottom plate 65 that is integrally connected with screws 64 in a lid-like manner;
A fixed blade 66 and a movable blade 67 whose respective cutting edges protrude from a blade opening 77 at the upper part of the front wall 63a of the blade holder 63.
and a vibrator 68 that vibrates the movable blade 67 inside the blade holder 63. The fixed blade 66 is supported and fixed to the top wall 63b of the blade holder 63 by two support shafts 69, and the movable blade 67 has two elongated holes 70 that are long in the vibration direction and are inserted into the support shafts 69. . The vibrator 68 has its base 68a inserted through a vertical shaft 71 erected on the bottom plate 65, and horizontally swings around the vertical shaft 71. This vibrator 68 has a forked portion 72 at its tip, and an engagement piece 7 at the top of the vibrator 68.
3 and 73, and a projecting piece 74 protruding from the rear end of the movable blade 67 is engaged between the engaging pieces 73 and 73.
The bottom plate 65 has a positioning hole 56 that matches the positioning protrusion 75 on the top cover 14 similarly to the bottom plate 54 of the rotary blade unit 3, and a positioning hole 56 that matches the positioning protrusion 75 on the top cover 14, although not shown.
It has engaging pieces 31, 31 that protrude from it, and engaged pieces 57, 57 that engage and disengage. Therefore, in order to attach and detach this vibrating blade unit 3 to and from the upper lid 14, the engaged pieces are moved by moving the engaging pieces 31 with the operating knob 32, in the same manner as the procedure for attaching and detaching the rotary blade unit 3. It is only necessary to engage or disengage the coupling pieces 57 and 57. Note that the vibrating blade unit 3 is attached to the top lid 14.
, the eccentric cam 76a of the driver 76 on the drive shaft 19 is removably engaged with the bifurcated portion 72 of the vibrator 68, so that the vibrator 68 is connected to the drive shaft 19.
Power is transmitted to.

As explained above, according to this invention, the bottom side of the blade unit 3 is detachably attached to the protruding upper end surface of the drive shaft 19 of the main body case 1 via the bayonet coupling means. is the operation knob 32 attached to the main body case 1.
By moving the engaging pieces 31, 31 provided on the upper end side of the main body case 1 by the sliding operation, the engaging pieces 31, 31 are moved to the engaged pieces 57, on the bottom side of the blade unit 3. 57. Therefore, the blade unit 3 can be easily attached and detached by simply sliding the operation knob 32, and there is no need to tightly grip the blade unit 3 by hand as in the conventional case. The blade units 3 can be safely attached and detached without causing any deformation damage to the blade 50 or injuring the hand with the cutting edge of the vibrating blade unit 3.

[Brief explanation of drawings]

The drawings show an embodiment of the electric shaver according to the invention, and FIG. 1 is a perspective view of the electric shaver, FIG. 2 is an exploded perspective view, and FIG. 3 is a longitudinal side view.
Fig. 4 is a longitudinal sectional front view, Fig. 5 is a - line sectional view in Fig. 4, Fig. 6 is a - line sectional view in Fig. 4, Fig. 7 is a - line sectional view in Fig. 3, and Fig. 8 is a - line sectional view in Fig. 4. 9 is a cross-sectional view of the shutter in a closed state corresponding to FIG. 7, and FIG. 9 is an exploded perspective view of the hair tray, the bottom plate, and the drive unit. Fig. 10 is a perspective view of an electric shaver showing another embodiment of this invention;
FIG. 1 is a side view showing a cutaway portion of the blade unit, and FIG. 12 is a perspective view of the vibrator. 1... Main body case, 2... Drive unit, 3...
...Blade unit, 16...Blade unit attachment/detachment operation ring, 19...Drive shaft, 31...Engagement piece, 57...
Engaged piece, 32...operation knob.

Claims (1)

[Scope of utility model registration request] An electric shaver in which the bottom side of a blade unit 3 having a shaving blade driven by a drive shaft 19 is removably attached to the upper end surface of a main body case 1 from which a drive shaft 19 can protrude via a bayonet coupling means. In this case, the bayonet coupling means is provided between the engaged pieces 57 provided on the bottom side of the blade unit 3 and the engaged pieces 5 provided on the upper end surface side of the main body case 1.
The engaging pieces 31, 31 engage and disengage from the engaged pieces 57, 57 by sliding the operation knob 32 attached to the main body case 1. An electric shaver characterized by being movable in the direction of engagement and disengagement.