JP4420363B2 - Electric razor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric razor and is an improvement of a locking mechanism provided to maintain the mounting state of the outer blade holder.
[0002]
[Prior art]
Japanese Patent Laid-Open No. 7-299262 discloses a lock mechanism of this type. There, a pair of left and right lock bodies are arranged on the front and rear surfaces of the razor head so as to be freely retractable, and these lock bodies are advanced and biased by springs so that the outer blade holder can be locked and held. Further, in order to simultaneously unlock each lock body against the spring, a slide frame is provided on the lower surface of the lock body, and a cam groove and a pin are provided between the frame and the lock body. The slide frame is retreated while pushing the lock release buttons provided on the head frame against each spring against the spring.
[0003]
Japanese Patent Laid-Open No. 10-216374 also proposes a locking mechanism having the same purpose. There, a pair of front and rear lock bodies are provided on the left and right side surfaces of the razor head, and these lock bodies can be simultaneously retracted by a lock release frame. The lock release frame and each lock body are integrally molded with plastic, and a V-shaped hinge portion that converts a pushing operation into a reverse motion is provided in the middle of the frame body. This hinge part is always received by a fixed wall inside the razor head, and when one arm of the hinge part is pressed against the fixed wall, the whole hinge part tilts and the other arm moves away from the fixed wall. The movement conversion in the reverse direction is realized by moving in the direction. Similarly, the lock mechanism of the present invention is integrally formed with an operation frame for unlocking and a lock body.
[0004]
[Problems to be solved by the invention]
In the former former razor, the lock mechanism is composed of four lock bodies, a guide body that slidably guides them, a spring and a slide frame, etc., so the number of parts is large, and the cost increases accordingly. It takes a lot of time to assemble. On the other hand, since the latter razor integrally molds members other than the spring, the number of components of the lock mechanism can be remarkably reduced, and the labor of assembly can be saved. The problem is that motion conversion is performed by tilting the hinge portion like a lever with a V-shaped hinge portion and a fixed wall that receives the hinge portion, so that the amount of movement of the lock body that is pulled in by the motion conversion tends to vary. In the point. There is also a disadvantage that the amount of movement of the lock body tends to vary depending on the variation in the shape of the hinge portion and the slight variation in the contact position between the hinge portion and the fixed wall.
[0005]
An object of the present invention is to enable the lock body and the operation frame for unlocking the lock body to be integrally molded with plastic so that all the lock bodies can be properly unlocked without variation, and It is to facilitate attachment / detachment of the outer blade holder to / from the razor head. Another object of the present invention is to reduce the manufacturing cost of an electric shaver by reducing the number of components of the lock mechanism for the outer blade holder, thereby reducing the manufacturing cost and further reducing the assembly effort. It is in.
[0006]
[Means for Solving the Problems]
In the electric razor according to the present invention, the outer blade holder 22 is detachably attached to the razor head 6, and a lock mechanism is provided inside the razor head 6 to lock and hold the attached state of the outer blade holder 22. The lock mechanism is disposed at a plurality of positions on at least one of the front and rear surfaces of the razor head 6, and a lock body 55 that engages with an engagement portion 51 provided on the outer blade holder 22, and the lock body 55 is advanced to a lock posture. A spring 56 to be urged, and an operation frame 53 that is operated to be displaced in a direction crossing the direction in which the lock body 55 is withdrawn and operated to release the lock body 55 against the urging force of the spring 56. Each lock body 55 and the operation frame 53 are integrally plastic-molded via a branch arm 54 that connects the both 53 and 55. The branch arm 54 and the fixed projection 69 that receives the branch arm 54 constitute a motion conversion function, and the displacement of the operation frame 53 in the unlocking direction is converted into a direction crossing the displacement direction by the motion conversion mechanism and locked. Tell body 55.
[0007]
Specifically, the branch arm 54 and the operation frame 53 and the branch arm 54 and the lock body 55 are connected to each other via a thin hinge portion 58 so as to be relatively displaceable.
[0008]
The branch arm 54 is inclined and arranged in parallel to the displacement direction of the operation frame 53, and with the displacement of the operation frame 53 in the unlocking direction, the branch arm 54 is a fixed protrusion 69 and the operation frame 53. The tilting operation is performed in such a direction that the angle between the branch arms 54 decreases.
[0009]
On the left and right sides of the operation frame 53, a pair of lock bodies 55 and branch arms 54 that are paired in front and rear are provided. A lock urging spring 56 is disposed between the pair of front and rear branch arms 54.
[0010]
The razor head 6 includes a frame 20 that opens upward and a lid 21 that closes the upper surface opening of the frame 20 as an attachment base. An inner blade driving vibrator 18 and a lock mechanism for the outer blade holder 22 are accommodated in a room surrounded by the frame 20 and the lid 21. The vibrator 18 is erected at the left and right centers of the front and rear edges of the base wall 63, the flat base wall 63, the base wall 63, a pair of front and rear vibration absorbing arms 64 that extend upward at both ends of the base wall 63. The drive shaft 25 and a mounting base 65 projecting laterally continuously from the upper end of the vibration absorbing arm 64 are provided. An operation frame 53, a branch arm 54, and a lock urging force are provided in a gap space between the left and right of the vibration absorbing arm 64 and the drive shaft 25 at both ends, and between the pair of front and rear vibration absorbing arms 64 and the front and rear of the drive shaft 25. A spring 56 or the like is disposed.
[0011]
Each lock body 55 is guided and supported by the grooves 59 provided at the front and rear edges of the frame 20 so as to be freely retractable. The attachment base 65 of the inner blade vibrator 18 and each lock body 55 are held and fixed by the lid body 21 fixed to the frame 20.
[0012]
A fixing projection 69 for receiving the branch arm 54 is provided on the inner surface of the upper wall of the lid 21.
[0013]
The connection form of the operation frame 53, the branch arm 54, and the lock body 55 is made different so that the retraction timing of one front / rear pair of the lock body 55 is different from the retraction timing of the other front / rear pair.
[0014]
[Action]
When the operation frame 53 is operated to be displaced in a direction intersecting the direction in which the lock body 55 is withdrawn / retracted, the branch arm 54 tends to be displaced along with the operation frame 53. However, since the branch arm 54 is received by the fixed protrusion 69, it is displaced along with the operation frame 53 while being deformed so as to go around the fixed protrusion 69. The deformation direction at this time coincides with the direction in which the lock body 55 is retreated into the razor head 6. Therefore, the lock body 55 can be unlocked against the urging force of the spring 56 even though the operation frame 53 is displaced in a direction intersecting with the direction in which the lock body 55 is retracted.
[0015]
As described above, in the present invention, the branch arm 54 is received by the fixed protrusion 69 and the branch arm 54 gradually turns around and tilts along the fixed protrusion 69, whereby the horizontal displacement of the operation frame 53 is changed in the front-rear direction. Since the motion is converted into the displacement, the unlocking operation of the lock body 55 can be reliably performed without variation as in the positive movement mechanism. Further, since the lock body 55 is always urged to move to the lock posture by the dedicated spring 56, when the operation force on the operation frame 53 is released, the lock body 55 can be immediately returned to the lock posture. Therefore, according to the locking mechanism of the present invention, the outer blade holder 22 can be locked without being affected by variations in the formation of the branch arm 54 and slight variations in the contact position between the branch arm 54 and the fixing protrusion 69. The release operation can be performed accurately, and the razor head 6 can be smoothly attached and detached.
[0016]
According to the lock mechanism that connects the branch arm 54 and the operation frame 53 and the branch arm 54 and the lock body 55 via the thin-walled hinge portion 58 so as to be relatively displaceable, the branch arm 54 extends along the fixing protrusion 69. The deformation resistance of the branch arm 54 with respect to the operation frame 53 and the lock body 55 at the time of tilting around is remarkably reduced, and the unlocking operation can be easily performed.
[0017]
According to the lock mechanism in which the branch arm 54 is inclined and tilted in the direction approaching the operation frame 53 with the fixing protrusion 69 to unlock the lock body 55, the operation frame 53 is unlocked. In addition to smoothing the slewing and tilting action of the branch arm 54 at the time, the deformation resistance can be further reduced. The retraction input when the lock body 55 is retreated is initially small and can be gradually increased as it retreats.
[0018]
In the lock mechanism in which the lock body 55 and the branch arm 54 are provided in pairs on the left and right and front and rear, the left and right two places on the front wall of the outer blade holder 22 and the left and right two places on the rear wall are engaged by the lock body 55 to The blade holder 22 can be locked and held in a stable state without wobbling.
[0019]
An inner blade driving vibrator 18 is accommodated in a chamber surrounded by the frame 20 and the lid 21, and a gap space between the vibration absorbing arm 64 provided on the vibrator 18 and the drive shaft 25 is used to According to the electric razor in which the lock mechanism is arranged, the razor head 6 can be made compact by the amount in which the vibrator 18 and the lock mechanism are collectively arranged, and the electric razor can be miniaturized.
[0020]
According to the razor head structure in which the attachment base 65 of the vibrator 18 and the lock body 55 are held and fixed by the lid body 21, the vibrator 18 and the lock mechanism can be easily removed from the frame 20 simply by removing the lid body 21. Maintenance work such as cleaning and replacement of the vibrator 18 and the lock mechanism, or a chamber for housing these parts, can be easily performed.
[0021]
When the fixing projection 69 for displacing the branch arm 54 is provided on the lid body 21 side, the fixing projection 69 can be prevented from obstructing the assembly when the vibrator 18 or the lock mechanism is assembled in the frame 20. Therefore, as compared with the case where the fixing protrusion 69 is provided on the inner bottom of the frame 20, the assembly can be performed quickly. Further, when the fixed protrusion 69 is provided on the inner bottom of the frame 20, the planar view shape of the base wall 63 of the vibrator 18 is restricted by the relationship with the arrangement position of the fixed protrusion 69. Therefore, the left and right dimensions and the front and rear dimensions of the base wall 63 can be set large. In other words, the rigidity of the base wall 63 that inherits the rotational power can be improved, and it is convenient to provide a pair of front and rear drive shafts 25 on the base wall 63.
[0022]
According to the lock mechanism in which the retract timing of one front / rear pair of the lock body 55 and the other front / rear pair is different, the lock body 55 can be unlocked after one of the pair of lock bodies 55 is unlocked. It is possible to prevent the entire outer blade holder 22 that has received the upward biasing force of the blade 33 from jumping off at the same time as the lock is released. For example, after unlocking the front / rear pair of the lock bodies 55 provided on the left half side of the outer blade holder 22, the front / rear pair of the lock bodies 55 on the right half side is unlocked, and the pushing force by the inner blade 33 is increased in the meantime. Therefore, the outer blade holder 22 can be prevented from jumping up vigorously.
[0023]
【Example】
1 to 15 show a water-washing type electric shaver to which the present invention is applied. This electric razor is composed of a swing-type electric razor in which a razor head is pivotally supported in a swingable manner. 2 to 9, the electric razor includes a deformed cylindrical main body case 1 that opens downward, an electrical component unit 2 that is inserted and loaded into the main body case 1 from the lower surface side, a bottom case 3, and an upper surface of the main body case 1. The head frame 4 fixed to the head frame 4 and a pair of left and right side frames 5 and 5 of the head frame 4 are configured with a razor head 6 and the like as main constituent members so as to be swingable back and forth, that is, swingable. is there. The left side frame 5 is provided with a lock release button 52 which will be described later.
[0024]
The head frame 4 and the electrical component unit 2 are fastened with screws 7 with the upper wall of the main body case 1 in between, and the bottom case 3 and the electrical component unit 2 are fastened with screws 8. Sealing with an O-ring or packing prevents water from entering the main body case 1 and enables the razor head 6 to be washed with water. The electrical component unit 2 is mounted on a plastic molded unit base 11 with a motor. 9. A secondary battery 10, a circuit board and the like are assembled, and a motor starting switch and the like are arranged on the circuit board (see FIG. 4).
[0025]
A switch knob 13 for starting the motor is provided on the front surface of the main body case 1. As shown in FIG. 8, a wobbling blade unit 14 is disposed on the rear surface of the head frame 4, and a slide knob 15 for raising and lowering the unit 14 is provided on the rear surface of the main body case 1. Motor power is generated through an eccentric cam 16 fixed to the output shaft of the motor 9, a swaying vibrator 17 that is reciprocally driven by the eccentric cam 16, and an inner blade system vibrator 18. It is transmitted to the blade unit 14 and the inner blade described later. In FIG. 2, reference numeral 12 denotes a cap for protecting the outer blade.
[0026]
11 to 14, the razor head 6 is used for an inner blade in a chamber surrounded by the frame 20 and the lid body 21, using an inverted portal frame 20 and a lid body 21 screwed to the frame 20 as an attachment base. The vibrator 18 and a lock mechanism for the outer blade holder 22 are incorporated, and the outer blade holder 22 is detachably attached to the frame 20. A pair of front and rear first blade bodies 23, 23 are disposed between the outer blade holder 22 and the lid body 21, and a second blade body 24 is provided between the both blade bodies 23, so that both the 23, 24 are attached to the previous blade body 23. The vibrator 18 can be driven simultaneously (see FIG. 8). The vibrator 18 is provided with a pair of front and rear drive shafts 25 protruding from the upper surface of the lid 21.
[0027]
The shaft 26 fixed to the outer surfaces of the pair of left and right side walls of the frame 20 is pivotally supported by the head frame 4 so that the entire razor head 6 can be swung in the front-rear direction. In order to lock the razor head 6 so that it cannot swing, a lock knob 29 and a lock bar 30 are provided to slide up and down on one side of the head frame 4 as shown in FIG. The razor head 6 can be locked and locked in the state of being engaged with the lock recess 31.
[0028]
In FIG. 9, the first blade body 23 is composed of an inner blade 33 that is separably press-fitted to the drive shaft 25 and an outer blade 34 that is supported by the outer blade holder 22 in an arched cross section. The inner blade 33 is pressed against the outer blade 34 and biased by a spring 27 (see FIG. 11) disposed inside the shaft 25.
[0029]
In FIG. 14, the outer blade holder 22 is disposed between a holder frame 35 having upper and lower walls and left and right walls that are open on the upper and lower sides, the outer blade 34 disposed on the front and rear of the upper surface, and both outer blades 34. The second blade body 24 and the guide frame 36 provided below the second blade body 24 are configured. Among these components, the front and rear outer blades 34 for the first blade body 23 are welded and integrated with the front and rear surfaces of the guide frame 36 via a float frame.
[0030]
As shown in FIG. 6, the second blade 24 includes a U-shaped outer blade 38 that opens downward, an inner blade 39 that is fitted in the outer blade 38 and is driven to reciprocate left and right, and the outer blade 38. A pair of left and right side end pieces 40 engaged and mounted on both ends of the inner edge 39, a passive piece 41 fixed to the center of the inner blade 39, and an inner blade 39 pressed against the outer blade 38 by being assembled to the passive piece 41. The plate spring 42 is configured as one unit part.
[0031]
The inner blade 39 of the second blade body 24 is driven to reciprocate by a drive piece 45 that is externally fitted to the front and rear drive shafts 25 of the vibrator 18. As shown in FIG. 11, the drive piece 45 has a lid wall 46 that closes the opening surface of the lid 21, and a drive projection 47 that engages with the passive groove of the passive piece 41 projects upward at the front and rear center thereof. . Engaging claws 48 that engage with the respective drive shafts 25 are provided on the lower central surface of the front and rear edges of the lid wall 46 (see FIG. 14). The lid wall 46 prevents fouling from entering the room surrounded by the frame 20 and the lid body 21, and fouling and sebum adhere to the vibrator 18 and the lock piece mechanism disposed in the room. This helps to prevent the operation of these drive parts from being hindered.
[0032]
The outer blade holder 22 is connected to the razor head 6 so as to be able to open and swing in the front-rear direction, so that the outer surface of the inner blade 33 of the first blade body 23 can be largely opened during washing. For this purpose, as shown in FIGS. 9 and 10, a pair of left and right guide pieces 70 are integrally formed on both sides of the rear surface of the lid 21, and the rear wall of the holder frame 35 is formed by vertically long grooves 71 defined by the guide pieces 70. The shaft body 72 projecting on both sides of the lower end of the guide is supported so as to be slidable up and down. Near the lower end of the guide piece 70, a connection port 73 that allows the shaft body 72 to be taken in and out is provided. The upper and lower gaps of the connection port 73 are set slightly smaller than the diameter dimension of the shaft body 72.
[0033]
As described above, by sliding and guiding the shaft body 72 provided on the holder frame 35 with the groove 71, the holder frame 35 is fitted into the mounting portion of the frame 20 and the outer blade 34 is A use position (the state shown in FIG. 8) in close contact with the inner blade 33 and a swing standby position (see FIG. 9) where the entire outer blade holder 22 slides upward to the upper end of the groove 71 and is separated from the mounting portion and the inner blade 33. And the open position in which the outer blade holder 22 reversely swings toward the rear side of the razor with the shaft body 72 as the center to completely open the front and rear surfaces of the inner blade 33 and the fluff chamber (imaginary line in FIG. 9). The state shown in FIG. The outer blade holder 22 is once slid upward to the swing standby position to avoid the holder frame 35 from contacting and interfering with the inner blade 33 during the open swing and further to the passive piece 41 of the second blade body 24. This is because the drive piece 45 is separated.
[0034]
In order to lock and hold the outer blade holder 22 fitted to the razor head 6, a lock mechanism shown in FIGS. 11 to 15 is provided. The lock mechanism includes a lock piece 50 incorporated in the frame 20, a total of four engaging portions 51 formed in the left and right inner surfaces of the front and rear walls of the holder frame 35 (see FIG. 14), and unlocking the lock piece 50. It consists of buttons 52 and the like.
[0035]
1 and 11, the lock piece 50 includes a horizontally long rod-shaped operation frame 53 provided at the front and rear center, four branch arms 54 branched and led out from the middle part of the front and rear surfaces of the operation frame 53 and the right end, and the branch arms 54. The lock body 55 is in a locked position between the opposing surfaces of the branch arms 54 that are paired in the front and back. A spring 56 for urging and advancing is arranged. The spring 56 is formed of a compression coil spring and is externally fitted to a pin 57 formed integrally with the branch arm 54. The branch arm 54 is provided so as to be inclined at 45 degrees with respect to the operation frame 53, and both ends thereof are continuous with the operation frame 53 and the lock body 55 through thin hinges 58. Thus, by providing the hinge part 58, the branch arm 54 can tilt without trouble in the direction in which the front and rear branch arms approach each other.
[0036]
The lock body 55 is guided and supported so as to be freely withdrawn and retracted by grooves 59 formed in notches in front and rear opening edges of the frame 20, and an advance limit is defined by a restriction piece 60 projecting on both sides of the inner surface of the lock body 55. In a state in which each lock body 55 is loaded in the groove 59, the operation end of the operation frame 53 faces the outer surface of the frame through a through hole 61 provided in one side wall of the frame 20. A button 52 is arranged on the outer surface of the operation end.
[0037]
As described above, the lock piece 50 is incorporated in the frame 20 together with the vibrator 18, but in order to avoid contact interference with the vibrator 18, the operation frame 53, the branch arm 54, the lock body 55, and the spring 56 is disposed in a structure provided in the vibrator 18, specifically, in a gap space on the front and rear, left and right of the drive shaft 25 and the vibration absorbing arm 64. As shown in FIG. 11, the vibrator 18 is a plastic molded product in which thin vibration absorbing arms 64 are provided around both ends of a rectangular base wall 63, and upper ends of the front and rear vibration absorbing arms 64 are connected to each other by a mounting base 65. A rectangular tube-shaped drive shaft 25 projects from the front and back of the center of the base wall 63. The left and right mounting bases 65 are placed on the bracket 66 provided on the inner surface of the side wall of the frame 20, the lid 21 is put on the upper surface, and then the lid 21 is fastened and fixed to the bracket 66 with screws 67. The mounting base 65 is integrated with the frame 20. In this state, the passive groove 68 provided on the lower surface of the base wall 63 faces the lower surface of the frame from a through hole provided in the bottom wall of the frame 20. In order to convert the rotational movement of the eccentric cam 16 into a reciprocating movement and to enable power transmission even when the razor head 6 is swung, the passive groove 68 is formed as a long groove in the front and rear of a partial arc shape.
[0038]
The lid body 21 fixed to the frame 20 blocks the upper surface opening of the groove 59 for the lock body 55 and prevents the lock body 55 from moving upward. Further, round shaft-shaped fixing projections 69 provided on the four inner surfaces of the lid body 21 enter the frame 20 and circumscribe each branch arm 54. As shown in FIG. 11, the branch arm 54 and the fixing protrusion 69 convert the lateral movement of the operation frame 53 into a forward / backward movement, and unlocks the lock body 55 against the urging force of the spring 56. . For this purpose, the fixing protrusion 69 is arranged on the side for receiving the branch arm 54 that is to move along with the operation frame 53. When the operation frame 53 is pushed by the button 52, each branch arm 54 is oriented in the direction indicated by the arrow. Tilt operation.
[0039]
More specifically, each branch arm 54 tilts around the fixing projection 69 while resisting the biasing force of the spring 56, and the angle between the operation frame 53 and the branch arm 54 gradually decreases. As a result, each lock body 55 receives a force in a direction of retracting inward of the frame 20 and is released from the engaging portion 51 while being guided by the groove 59.
[0040]
If the four lock bodies 55 are separated from the engaging portion 51 at the same time, there is a possibility that the entire outer blade holder 22 may be thrown off due to the pushing force of the inner blade 33 acting on the front and rear outer blades 34. is there. In order to avoid such a situation, the retraction timing of the left front-rear pair of the lock body 55 and the right front-rear pair is different.
[0041]
Specifically, the pair of left front and rear lock bodies 55 are disengaged from the engagement portion 51 and then the right pair of front and rear lock bodies 55 are disengaged from the engagement portion 51 as shown in FIG. . Therefore, in the left front-rear pair, the hinge portion 58 continuous to the branch arm 54 is continued on the inner end surface of the lock body 55, and in the right front-rear pair, the hinge portion 58 continuous to the branch arm 54 is restricted. It is made to continue on the inner surface of the left end of the piece 60. In this way, if the connection position of the lock body 55 and the branch arm 54 is made different, even if the inclination angle of the branch arm 54 is the same, a difference occurs in the retraction amount of the lock body 55. It can be made different between left and right front and rear pairs. By the way, it is also possible to retreat in the same way by changing the engagement depth between the lock body 55 and the engagement portion 51 in the left and right front and rear pairs, or by changing the inclination angle of the branch arm 54 between the left and right front and rear pairs. The input timing can be varied. Of course, the right pair of front and rear lock bodies 55 can be detached from the engaging portion 51 first, and if necessary, one of the front and rear left and right pairs can be separated first.
[0042]
FIG. 15 shows a procedure for assembling the lock piece 50. Before assembling the lock piece 50, the vibrator 18 is assembled in the manner described above. Next, the operation end of the operation frame 53 is passed between the left front and rear pair of the vibration absorbing arm 64 and applied to the through hole 61. In this state, while pushing the lock piece 50 horizontally, the operation end is inserted into the through-hole 61 and the whole is housed in the frame 20. Each lock body 55 is fitted into the groove 59, and the lid body 21 is fastened to the bracket 66 with a screw 67. Thereafter, the drive piece 45 is externally attached to the drive shaft 25, and the inner blade 33 is attached to each drive shaft 25.
[0043]
Next, a modified example of the lock piece 50 will be described with reference to FIGS. 16 and 17. In each modified example, only characteristic changes are described, and the same members as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0044]
In the lock piece 50 in FIG. 16, the positions of the front and rear lock bodies 55 constituting the left and right front and rear pairs are shifted left and right so that the four lock bodies 55 are arranged in a staggered manner before and after the operation frame 53. . Further, a spring 56 is disposed between the right end portion of the operation frame 53 and the side wall of the frame 20, and the lock body 55 is urged to lock by the spring 56.
[0045]
The lock piece 50 in FIG. 17 is provided with a pair of left and right lock bodies 55 only on the rear side of the operation frame 53. In this case, the outer blade holder 22 is provided with the engaging portion 51 only on the inner surface of the rear wall of the holder frame 35, and the front wall side is hooked and connected to the frame 20.
[0046]
In addition to the above, the engaging portion 51 provided on the holder frame 35 can be formed by a protrusion. The branch arm 54 of the lock piece 50 is preferably disposed to be inclined with respect to the operation frame 53, but this is not always necessary. For example, the branch arm 54 can be arranged so as to be substantially orthogonal to the operation frame 53. Further, when the branch arm 54 is formed in a block shape, an arc shape, or a disk shape, it is not necessary to be inclined and a guide surface that is inclined toward the fixed projection 69 can be provided. The spring 56 can be formed of a torsion coil type kick spring or leaf spring, and can be formed of a plastic spring formed integrally with the operation frame 53 if necessary. The fixing protrusion 69 can be provided on the frame 20 side.
[Brief description of the drawings]
FIG. 1 is a cross-sectional plan view showing a locking mechanism.
FIG. 2 is an inclined view of an electric razor.
FIG. 3 is an exploded cross-sectional view of an electric razor.
FIG. 4 is an exploded perspective view of a main body case.
FIG. 5 is an exploded perspective view of the razor head side.
FIG. 6 is a central longitudinal front view of a razor head.
FIG. 7 is a longitudinal front view passing through the center of the inner blade of the razor head.
FIG. 8 is a vertical side view of a razor head.
FIG. 9 is a longitudinal side view of the outer blade holder in a separated state.
FIG. 10 is a rear view with the outer blade holder removed.
FIG. 11 is an exploded perspective view of a razor head.
FIG. 12 is a longitudinal front view of the razor head with the outer blade holder and the inner blade removed.
13 is a cross-sectional view taken along line AA in FIG.
FIG. 14 is a vertical side view of the razor head with the outer blade holder removed.
FIG. 15 is an exploded cross-sectional view showing an assembled state of the lock piece.
FIG. 16 is a plan view showing another embodiment of the lock piece.
FIG. 17 is a plan view showing still another embodiment of the lock piece.
[Explanation of symbols]
6 Razor head
20 frames
21 Lid
22 Outer blade holder
51 engaging part
52 button
53 Operation frame
54 Branch Arm
55 Lock body
56 Spring
69 Fixing protrusion

Claims (8)

An electric razor in which an outer blade holder 22 is detachably attached to the razor head 6 and a lock mechanism is provided inside the razor head 6 to lock and hold the attached state of the outer blade holder 22.
The locking mechanism is disposed at a plurality of positions on at least one of the front and rear surfaces of the razor head 6, and a locking body 55 that engages with an engaging portion 51 provided on the outer blade holder 22, and the locking body 55 is advanced to a locking posture. An operating frame 53 that is operated to displace the lock body 55 against the urging force of the spring 56 and is operated to be displaced in a direction that intersects the direction in which the lock body 55 is withdrawn and retracted.
Each lock body 55 and the operation frame 53 are integrally molded with plastic via a branch arm 54 that connects the both 53 and 55.
The branch arm 54 and the fixed protrusion 69 that receives the branch arm 54 constitute a motion conversion function.
An electric razor characterized in that a displacement in the unlocking direction of the operation frame 53 is converted to a direction crossing the displacement direction by an operation conversion mechanism and transmitted to the lock body 55. The electric shaver according to claim 1, wherein the branch arm and the operation frame, and the branch arm and the lock body are connected to each other via a thin hinge portion so as to be relatively displaceable. The branch arm 54 is tilted in a non-parallel manner with respect to the displacement direction of the operation frame 53. As the operation frame 53 is displaced in the unlocking direction, the branch arm 54 is a fixed protrusion 69 and the operation frame 53. The electric shaver according to claim 1 or 2, wherein the electric shaver is tilted so that the angle between the branch arms 54 decreases. A pair of lock bodies 55 and branch arms 54 that make a pair in the front and rear are provided on the left and right sides of the operation frame 53, and a lock biasing spring 56 is disposed between the pair of front and rear branch arms 54. The electric shaver according to claim 1, 2, or 3. The razor head 6 is configured with a frame 20 that opens upward and a lid body 21 that closes the upper surface opening of the frame 20 as an attachment base,
In the room surrounded by the frame 20 and the lid body 21, the vibrator 18 for driving the inner blade and the lock mechanism for the outer blade holder 22 are housed.
The vibrator 18 includes a flat base wall 63, a pair of front and rear vibration absorbing arms 64 extending upward at both ends of the base wall 63, and a drive shaft 25 erected at the left and right centers of the front and rear edges of the base wall 63. A mounting base 65 projecting laterally continuously from the upper end of the vibration absorbing arm 64;
An operation frame 53, a branch arm 54, and a lock urging force are provided in the gap between the left and right vibration absorbing arms 64 and the drive shaft 25 at both ends and between the front and rear vibration absorbing arms 64 and the front and rear of the drive shaft 25. The electric shaver according to claim 4, wherein a spring 56 or the like is disposed. Each lock body 55 is guided and supported so as to be freely retractable by grooves 59 provided at the front and rear edges of the frame 20.
The electric razor according to claim 5 , wherein the mounting base 65 of the inner blade vibrator 18 and each lock body 55 are held and fixed by a lid 21 fixed to the frame 20. The electric shaver according to claim 5 or 6, wherein a fixing projection (69) for receiving the branch arm (54) is provided on the inner surface of the upper wall of the lid (21 ) . The connection form of the operation frame 53, the branch arm 54, and the lock body 55 is made different so that the retraction timing of one front-rear pair of the lock body 55 is different from the retraction timing of the other front-rear pair. The electric shaver according to 5, 6 or 7.

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