JPS5819316B2 - electric razor - Google Patents

Description

[Detailed Description of the Invention] 2 The present invention relates to an electric shaver in which trimmer blades move in and out through a gate with a door provided on the main body housing. This relates to an electric shaver in which the trimmer blade opens and then the trimmer blade comes out, and the trimmer blade is retracted by reverse operation, and then the door moves to close the gate, and the power switch is also turned on and off by operating the handle like this. The purpose is to prevent the vibration of the trimmer block with the trimmer blade at the front end? To provide an electric shaver that reduces noise, reduces the operating force required to take in and out the trimmer blade, and reliably maintains the protruding state of the trimmer blade.

FIG. 1 shows a supported state of a trimmer block 6 having a trimmer blade 7 at its front end in a conventional example.

The trimmer block 6 is arranged at the lower center of the blade mount 4, and its rear side is guided by the blade mount 4 so that it can freely slide in the front and rear direction.
A trimmer holding plate 40 which is caulked and fixed to the blade mount 4 is disposed on the lower surface of the trimmer.

The trimmer base 56, on which each component is attached to form the trimmer block 6, has a protrusion 90 on the front upper surface and a spring piece 72 on the rear upper surface.

The tip of the spring piece 72 is connected to the bottom surface of the blade mount 4 and the dustproof cap 9
1, and the protrusion 90 is in elastic contact with the guide 1 guide groove 9 on the lower surface of the blade mount 4.
2.

In this case, the protrusion 90 and the guide groove 92 are fitted with a clearance so that a gap exists, and the front part of the trimmer block 6 is fitted with a clearance between the blade mount 4 and the trimmer holding plate 49.

Therefore, when the trimmer blade 7 is driven, this vibration causes the trimmer block 6 to vibrate up and down, as shown by the arrow in the figure, with its rear part as an axis, producing sound.

The present invention has been provided in view of this point, and will be described in detail below based on the embodiments shown in FIG. 2 and below.

In the figure, 1 is a main body housing, 3 is an outer cutter frame equipped with an outer cutter 2, and 5 is a bottom cover. and an upper housing 11 in which mechanical parts such as the trimmer block 6 are housed.

The bottom cover 5 includes a battery holder portion 39 and is engaged with the lower end opening of the lower housing 12 , and a motor base 38 is fixed within the lower housing 12 .

The lower part of the motor is fixed to the motor base 38, and the upper part is housed in a lower cylindrical part that is housed in the lower housing 12 of the upper housing 11.

A ring-shaped bundle 10 is rotatably attached to the center of the upper housing 11.

The upper part of the upper housing 11 has a cup shape that opens upward, and the blade mount 4 is disposed at the upper end of the cup.

The blade mount 4 and the upper housing 11 are fixed to the lower housing 12 by screws 37 that pass through them and are screwed onto the motor base 38.

An outer cutter frame 3 is screwed onto the upper surface of the blade mount 4, and a rotary blade (not shown) that slides into contact with the outer cutter 2 is disposed in the internal space between the blade mount 4 and the outer cutter frame 3. Ru.

A boss 36 protrudes upward from the center of a floor 35 provided in the upper housing 11, and a cylindrical base 41 at the lower end of the boss 36
The operation plate 14 is rotatably mounted around the axis.

The operation plate 14 has a switch spring 42 attached to its lower surface and opens and closes the switch as it rotates, and an engagement piece 43 that protrudes downward through the floor 35 is engaged with the bundle 10 to close the bundle 10. rotates with.

This rotation range is regulated by the side edge of the operating plate 14 coming into contact with the peripheral wall of the hole 44 for the screw 37 to pass through.

A gear 25 is provided on one side of the operation plate 14, and a plurality of notches 26 are provided on the other side, with teeth facing toward the boss 36, respectively.

The gear 25 meshes with the lower gear 24 of the operating wheel 15, which is loosely fitted onto a shaft 45 that stands up from the floor 35.

46 is a ring that prevents the operation wheel 15 from being removed.

The operating wheel 15 further includes an upper gear 22 and a middle gear 23, and the lower gear 24 has teeth around the entire circumference, but the upper gear 22 and the middle gear 23 are only provided approximately halfway around the circumference. First, the door operating plate 16 driven by the upper gear 22 and the trimmer operating plate 18 driven by the middle gear 1a 23 via the trimmer operating wheel 17 operate intermittently in response to the operation of the bundle 10, respectively.

The trimmer operation wheel 17 is rotatably mounted on the boss 36,
The door operating plates 16 are rotatably fitted loosely into the trimmer operating wheel 17, and are rotated separately.

A cam groove 19 is cut into the upper surface of the trimmer operation plate 18 fixed to the upper end of the trimmer operation wheel 17, and one end of this cam groove 19 is located on the shaft side and curves toward the circumferential direction and is engaged. The groove portion 47 has the other end extending in the shape of a circular arc 5 in the outer circumferential direction.

The door operation plate 16 has a protrusion 31 on the outer circumferential surface of the shaft portion, and an arcuate pressing spring portion 21 is integrally formed from the tip of the door engagement rod 20 extending toward the outer circumference.

In the figure, 43 is a washer, 27 is clicked and has two spring pieces 28° 29, one spring piece 28 is attached to the operation plate 1.
The other spring piece 29 is click-engaged with a notch 26 provided in the door operating plate 16 .

A trimmer block 6 is further housed in the upper housing 11 in which these mechanical parts are arranged.

The trimmer block 6 is arranged on the lower surface of the blade mount 4, and is housed in the upper housing 11 while being pressed against the lower surface of the blade mount 4 by a trimmer holding plate 49 which is caulked and fixed to the blade mount 4. The trimmer holding plate 49 has a trimmer pin guide groove 50 formed rearward from a central drive shaft insertion hole 51, and a trimmer pin guide groove 50 is formed in the trimmer block 6.
A trimmer pin 52 protrudes downward from the lower surface of the rear end and protrudes downward from the trimmer pin guide groove 50.

Reference numeral 8 denotes a trimmer block 6, which is a trimmer blade at the front end; 7, a gate for entering and exiting, which is formed at the upper part of the upper housing 11 with its upper end open; It is opened and closed by a door 9 whose lower edge slides in a sliding groove 53.

One end of the door 9 engages with a door engaging rod 120 of the door operating plate 16, and the other end is pressed by a pressing spring portion 21.

The upper edge of the door 9 is a guide groove 5 provided on the lower surface of the blade mount 4.
It is also guided by 4.

In the trimmer block 6, a trimmer blade 7 consisting of a fixed blade and a movable blade is disposed at the front end of a trimmer base 56, and the front end of an annular drive rod 58, which is pivotally supported by a pin 57 on an annular portion at the rear of the trimmer base 56, is movable. It is configured to be connected to the blade, and its movement in the front and rear direction is guided by the blade mount 4.

The cylindrical shaft 59 penetrating the trimmer holding plate 49 and protruding downward is inserted into the upper recess of the insertion hole 44 of the upper housing 11, and is positioned relative to the upper housing 11 to attach the blade mount 1. and secure it with screws 37 as described above.

Trimmer pin 52 protruding from trimmer block 6
engages not only with the trimmer pin guide groove 50 of the trimmer holding plate 49 but also with the cam groove 19 of the trimmer operation plate 18,
As the trimmer operation plate 18 rotates, the portion of the cam groove 19 that overlaps the trimmer pin guide groove 50 changes from the outer circumferential side to the center side, or from the center side to the outer circumferential side. The trimmer block 6 is moved in the front-back direction.

Next, the operation will be explained.

When the trimmer blade 7 is not in use and the power to the motor is turned off, the engagement protrusion of one spring piece 28 of the click spring 27 is click-engaged with the notch 26 of the operation plate 14; The spring piece 29 is located on one side of the protrusion 31,
The gate 8 is closed by a door 9, and the trimmer block 6 is housed inside.

This state is shown in FIGS. 16 and 17.

When the handle 10 is operated from this state and the operation plate 14 is slightly rotated, the engagement protrusion 30 of the click spring 27 clicks into the next notch 26 of the operation plate 14, and the lower surface of the operation plate 14 clicks. Switch spring 42 closes the switch and energizes the motor.

The rotation of the motor projects upward from the boss 36 and the blade mount 4.

The signal is transmitted to the rotary blade attached to the upper end of the drive shaft 60.

At this time, the operation wheel 15 rotates slightly as the operation plate 14 rotates, but the upper gear 22 and the middle gear 23 do not rotate until their teeth mesh with the door operation plate 16 and the trimmer operation wheel 17. First, the door 9 and trimmer block 6 will not be moved.

Furthermore, the eccentric cam 64 provided on the outer periphery of the drive shaft 60 is not engaged with the drive rod 58 of the trimmer block 6, so the movable blade of the trimmer blade 7 is not driven.

To open the gate 8 and take out the trimmer blade 7, use the handle 10.
All you have to do is rotate it further.

The operating wheel 15 rotates via the operating plate 14, and the upper gear 22 first engages with the teeth of the door operating plate 16 to rotate the door operating plate 16.

At this time, the spring piece 29 rides on the protrusion 31 and bends.

Further, the door 9 moves with the rotation of the door operation plate 16, and the gate 8 opens.

Then, as shown in FIG. 19, when the spring piece 29 returns over the protrusion 30 and the door operation plate 16 rotates to the point where a click sound is generated, the gate 8 is completely opened and the upper gear 22 is no longer attached to the door operation plate. 16 teeth, and does not move even when the handle 10 is rotated thereafter.

Also in this state, the middle gear 23 of the operating wheel 15 is not engaged with the trimmer operating wheel 17.

When the gate 8 is opened and the handle 10 is further rotated after the click sound is generated, the middle gear 23 of the operating wheel 15 meshes with the trimmer operating wheel 17 and the trimmer operating plate 1 is rotated.
Rotate 8.

The rotation of the trimmer operating plate 18 rapidly changes the overlapping portion of the cam groove 19 with the trimmer pin guide groove 50 of the trimmer holding plate 49 from the outer peripheral side to the shaft side.

For this purpose, the trimmer block 6 engages the trimmer pin 52 with the trimmer pin guide groove 50 and the cam groove 19.
The trimmer blade 7 moves forward while being guided by various parts, and causes the trimmer blade 7 to protrude from the opened gate 8.

The trimmer pin 52 is finally located in the locking groove 47 to prevent the trimmer block 6 from retreating, and the trimmer block 6 rides on the push-up spring section 63 provided at the front of the trimmer holding plate 49, causing the blade mount to be removed. 4 Press it against the bottom surface.

At this point, as shown in FIGS. 20 and 21, one spring piece 28 of the click spring 27 is click-engaged with the notch 26, making the operation feel clear, and the switch spring 42 on the lower surface of the operation plate 14 is also activated. Close the switch and energize the motor.

At this time, the drive rod 5 is
8 engages, the rotational motion of the motor is converted into a swinging motion about the pin 57 of the drive rod 58, and this motion is transmitted to the movable blade to drive the trimmer blade 7 by 1. .

Further rotation of the handle 10 is prevented by the operation plate 14 coming into contact with the peripheral wall of the insertion hole 44.

If you turn the handle 10 in the opposite direction, first trimmer.

Tsuku 6 retreats. When the trimmer block 6 is completely retracted and retracted, the trimmer operating plate 18 will stop at a predetermined position, and if the handle 10 is further turned, the door operating plate 14 will press one spring piece 29 of the click spring 27. Rotate while deflecting and move door 9.

When the door 9 finishes closing the gate 8 and comes into contact with the stopper 65, the spring piece 29 climbs over the protrusion 31 and returns to its original position, producing a click sound.

At the same time, the other spring piece 28 of the click spring 27 also clicks into engagement with the notch 26.

In this state, the switch is still engaged, but if the handle 10 is further turned and only the operation plate 14 and operation wheel 15 are slightly rotated, the switch can be turned off.

Electric razor trimmer block 6 that works like this
Figure 4 shows an exploded view of the unit.

Elastic protrusions 71 provided with spring properties in the left-right direction are provided on the front upper surface and the rear end upper surface of the trimmer base 56, on which the trimmer blade 7 is mounted, respectively, with longitudinal longitudinal grooves 70. A pair of spring pieces 72 are integrally provided in the annular portion of the spring 72 and extend rearward and have rear tips protruding upward.

The drive rod 58 whose front end engages with the movable blade of the movable blade 7 of the trimmer blade 7 has a large diameter at the front and a small diameter continuous to the large diameter at the rear, and one side is attached to the trimmer base 56 by a pin 57.
As described above, when the trimmer block 6 is stored, the eccentric cam 64 is positioned within the large diameter portion of the drive rod 58 and eccentrically connected to the drive rod 58. When the trimmer block 6 is advanced and the trimmer blade 7 is taken out from the gate 8 without engaging with the cam 64, the narrow portion of the small diameter engages with the eccentric cam 64, and the pin 57 is rotated by the rotation of the eccentric cam 64. The drive rod 58 swings about the center, but what comes into direct contact with the eccentric cam 64 is a buffer material 77 that is integrally attached to the drive rod 58 by two-color molding.

This cushioning material 7 provided only on the contact surface with the eccentric cam 64
7 is a member with lower rigidity than the eccentric cam 64 and the drive rod 58;
For example, it is made of pelprene, and by providing a low-rigidity cushioning material 77 in a part of the drive rod 58, unnecessary vibrations of the drive rod 58 are absorbed, and the drive rod 58
By reducing the contact noise at the contact area between the drive rod 58 and the trimmer base 56, and by making contact with the eccentric cam 64 at the cushioning material 77, the contact between the drive rod 58 and the eccentric cam 64 due to the engagement gap is reduced. The sound is reduced.

Furthermore, a buffer material 77 is disposed only on the inner circumferential surface of the drive rod 58 so that it protrudes inward from the inner circumferential surface of the drive rod 58 as shown in FIG. By transmitting the load to the drive rod 58 on the outer circumferential side via the buffer material 77, the increased load is applied to the eccentric cam 64 regardless of whether the engagement with the first drive rod 58 is from a small press fit to a clearance fit. Therefore, the tolerance of the engagement dimensional accuracy between the eccentric cam 64 and the drive rod 58 is increased, and difficulties in processing can be reduced.

Moreover, since the buffer material 77 is integrally molded with the drive rod 58 by two-color molding, it is possible to easily achieve engagement dimensional accuracy.

In the figure, 78 is a washer, p is the eccentricity of the eccentric cam 64, and q
indicates the sliding width of the eccentric cam 64 with respect to the drive rod 58.

In addition to the above-mentioned elastic protrusions 71 and spring pieces 72, the trimmer base 56 equipped with such a drive rod 58 has small protrusions 73 and 74 on both sides of the front upper surface and on the lower part of both rear sides, and also has small protrusions 73 and 74 on both sides of the front end of the lower surface. Also, small projections 75 and 76 are provided on both sides of the rear end.

On the top surface, the blade mount 4 has recesses 80 and 80 on both rear sides for cleaning the beard, and recesses 8 protrude below the blade mount 4.
The rear part of the trimmer block 6 fits between 0.80 and the small protrusions 74 and 74 on both sides of the rear part come into contact.

In addition, each elastic protrusion 7 of the trimmer base 56 is inserted into two colinear sliding guide grooves 81 provided on the lower surface of the blade mount 4.
1, the elastic protrusion 71 comes into elastic contact with both side walls of the sliding guide groove 81.

Trimmer holding plate 4 caulked and fixed to the underside of the blade mount 4
Reference numeral 9 is made of a metal plate, and in addition to the aforementioned drive shaft insertion hole 51 and trimmer pin guide groove 50, it has a pre-caulking hole 82,
82 and cylindrical shaft insertion holes 83, 83 are provided, and at the time of punching and forming, leaf spring pieces 84° 84 extending forward are provided on both rear sides of the trimmer holding plate 49, and protrusions 85 are provided on the front portion.
A push-up spring portion 63 is formed.

Insert the cylindrical shaft 59 into the cylindrical shaft insertion hole 83, and press the trimmer holding plate 4.
When both sides of the central part in the front and back direction of the trimmer block 9 are caulked and fixed to the blade mount 4 and the trimmer block 6 is placed between the two, the elastic protrusion 71 is elastically engaged with the sliding guide groove 81, and the trimmer base The small protrusions 73 on the upper surface of the trimmer base 56 contact the lower surface of the blade mount 4, the small protrusions 74 at the bottom of both rear sides contact the outer wall of the recess 80 of the blade mount 4, and the small protrusions 73 on the lower surface of the trimmer base 56 on the front and rear The protrusions 75 and 76 push up the spring portions 63, respectively.
It makes elastic contact with the upper surface and the upper surface of the leaf spring piece 84.

When the handle 10 is rotated, the trimmer block 6 moves forward while being guided by the engagement and contact with the blade mount 4 and the engagement and elastic contact with the trimmer holding plate 49 via the trimmer operation plate 18 etc. as described above. However, due to the elastic engagement of the elastic protrusion 71 with the sliding guide groove 81, a cushioning property is created between the trimmer base 56 and the blade mounting base 4, and therefore, the vibration caused by the trimmer blade 7 when it is driven is generated. The chatter between the trimmer base 56 and the blade mount 4 can be eliminated, and the effect of noise reduction is significant. Due to the contact between the trimmer pin 52 and the cam groove 19 of the trimmer operating plate 18, the trimmer block 6 is stabilized against swinging in the left-right direction caused by the rotation of the trimmer operating plate 18, and the operating force is reduced. The trimmer block 6 can be moved forward and backward without causing any increase in trimmer block 6, and since the leaf spring piece 84 provided on the trimmer holding plate 49 comes into elastic contact with the small protrusion 76 at the rear of the trimmer base 56, the trimmer operating force can be reduced. It is something.

That is, the rear part of the trimmer block 6 is the trimmer base 56.
The spring pieces 72 and 72 provided on the blade mount 4 are pushed downward by the elastic contact with the blade mount 4, but when the trimmer block 6 is advanced as shown in FIG.
The contact point gradually changes from the base of the leaf spring piece 84 of the trimmer holding plate 49 to the free end, and for this reason, as the trimmer block 6 moves forward, the resistance received from the leaf spring piece 84 decreases, so that the contact point during the operation is reduced. The operating force can be reduced.

Therefore, when the trimmer operation plate 18, which has a cam groove 19 that engages with the trimmer pin 52, is rotated to move the trimmer blade 7 in and out, as shown in FIG. The pressure angle θ becomes large, and a large rotational force f is required in this vicinity, which increases the operating force of the bundle 10 and makes it difficult to use.
Since the acting force of the spring piece 72 is reduced by the deflection of the leaf spring piece 84 as the trimmer block 6 is displaced, the trimmer operating force F during the operation becomes small, and good operability can be obtained.

Furthermore, since the trimmer block 6 is pressed upward by the protrusion 85 provided at the front end of the push-up spring section 63, the 13th
As shown in the figure, the resistance at the final protrusion of the trimmer block 6 is particularly strong, so that the front part of the trimmer block 6 is prevented from inadvertently retreating due to external force. Since the small protrusion 75 on the lower surface can get over the protrusion 85 and click, the trimmer block 6 can be held securely in the protruding state, and the pressure angle θ between the trimmer pin 52 and the cam groove 19 is In this state, which is close to zero, the trimmer blade 7 would normally be retracted by a light operating force of the bundle 10, but this can be prevented;
It will be stopped.

[Brief explanation of the drawing]

Figures 1a and b are a plan view and side view of essential parts of the conventional example, Figure 2 is a perspective view of an embodiment of the present invention, Figure 3 is an exploded perspective view of the same as the above, and Figure 4 is the trimmer block of the same as the above.・An exploded perspective view of
Figure 5 is a sectional view of the drive rod, Figure 6 is a plan view of the drive rod, Figure 7 is an exploded perspective view of the blade mount, trimmer block, and trimmer holding plate, and Figure 8 is the X-- X-ray cross-sectional view, No. 9
The figure is a sectional view taken along the Y-Y line in Fig. 7, Fig. 10 a and b are wave and cross-sectional side views of the same main parts as above, Fig. 11 is a broken side view of other main parts, and Figs. 12 a, b, and c. is an explanatory diagram of the engagement state between the trimmer pin and the cam groove, FIG. 13 is a correlation diagram between the trimmer operating force and the amount of trimmer displacement, FIG. 14 is a longitudinal cross-sectional view of the same as the above, and FIG. 15 is a cross-sectional view of the same as the above. Fig. 16 and Fig. 17 a, b, and c are explanatory diagrams of the operation of each part in the off state, Fig. 18 and Fig. 19 a, b,
Fig. 20 and 21 a, b, and c are explanatory views of the operation of each part when the gate is open, and Figs. 20 and 21 a, b, and c are explanatory views of the operation of each part when the trimmer blade is in the protruding state, where 1 is the main body housing, and 4 is the blade mounting base. , 6 is a trimmer block, 7 is a trimmer blade, 8 is a gate, 9 is a door, 10 is a bundle, 14 is an operation panel, 18
19 is a trimmer operation plate, 19 is a cam groove, 49 is a trimmer holding plate, 50 is a trimmer pin guide groove, 52 is a trimmer pin, 56 is a trimmer base, 57 is a pin, 58 is a drive rod, 6
3 is a push-up spring part, 64 is an eccentric cam, 71 is an elastic protrusion, 73 to 75 are small protrusions, 77 is a buffer material, 81 is a sliding guide groove, 84 is a leaf spring piece, and 85 is a protrusion.

Claims (1)

[Claims] 1. A trimmer block equipped with a trimmer blade at its front end that can freely protrude from a gate provided in the main body housing is movable back and forth between a blade mounting base and a trimmer holding plate fixed to the lower surface of the blade mounting base. The trimmer block has an elastic protrusion on the front upper surface that elastically engages with the inner wall of a longitudinally long sliding guide groove cut into the lower surface of the blade mount. The push-up spring portion of the front portion of the trimmer holding plate that comes into elastic contact with a small projection attached to the front lower surface of the trimmer block that protrudes downward is provided with a projection on its front end that engages with a small projection of the trimmer block when the trimmer block moves forward. An electric razor characterized by: 2. The electric shaver according to claim 1, wherein the trimmer block has a rear side surface provided with small protrusions that make sliding contact with the wall surface of the blade mount. 3 The trimmer block, which is equipped with a trimmer blade at the front end that can freely protrude from the gate provided in the main body housing, is arranged so as to be movable back and forth between the blade mount and the trimmer holding plate fixed to the lower surface of the blade mount. The upper surface of the block was provided with a spring piece that came into elastic contact with the lower surface of the blade mount, and the trimmer holding plate was provided with a leaf spring piece that was long in the front-rear direction and whose free end was located forward and came into elastic contact with the lower surface of the trimmer block. An electric razor characterized by: