JP3433460B2 - Reciprocating electric razor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating electric shaver, and more particularly to a reciprocating electric shaver having a cassette type outer blade.

[0002]

2. Description of the Related Art When attaching an outer blade of a reciprocating electric shaver to a blade frame so that it can be floated in the vertical direction, the one disclosed in JP-A-63-226391 is provided on the outer blade. The hook provided on the blade frame is engaged with the locking hole, and the outer blade can be moved up and down within the play between the hook and the locking hole. The outer blade is urged upward by the spring force of the pushing up spring.

In this case, the curvature of the outer blade, which is curved when it is attached to the blade frame, changes with the vertical movement of the outer blade, which is not preferable in terms of adhesion with the inner blade and the outer blade. It is difficult to attach and detach to and from the blade frame when exchanging the blade, and when the blade frame is removed, the spring force is not applied and the outer blade lowers, so the outer and inner blades are not preferable when attaching and detaching the blade frame. There is a problem that it may hit in the state.

For this purpose, an outer blade frame for holding the outer blade is provided, and the outer blade is attached to the blade frame via the outer blade frame, and at least one of the engaging portions of the blade frame and the outer blade frame is provided. Is formed of an elastic piece, and the elastic piece urges the outer blade together with the outer blade frame upward, and the outer blade has a cassette type outer blade that can be replaced with the outer blade frame. It is proposed in Japanese Patent Laid-Open No. 4-220282. In this case, since the outer blade is moved up and down together with the outer blade frame holding the outer blade, there is no problem as in the conventional example and the handling is easy.

[0005]

However, in the conventional one having the cassette type outer blade, the elastic piece is integrally formed with the blade frame or the outer blade frame by hollowing out a part of the wall surface of the blade frame or the outer blade frame. The structure is complicated because the locking pin protruding from the other member is engaged with the locking hole provided at the tip of this elastic piece, so that the structure is complicated and the blade frame or outer blade having the elastic piece is formed. The cost of forming the frame was large.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reciprocating electric shaver capable of supporting the outer blade and the outer blade frame with a float at a low cost.

[0007]

SUMMARY OF THE INVENTION Thus the present invention, the outer cutter frame that holds the outer cutter, in a reciprocating type electric shaver that is mounted freely float vertically to the blade frame, the upper
The elastic piece facing downward from the outer blade frame where the outer blade is arranged on
The elastic piece is provided on the blade frame surrounding the outer blade frame.
Is provided with a stopper that can be received by the stopper
For the float that urges the outer blade frame upward with the elastic piece
It is characterized by obtaining the elastic force of .

[0008]

According to the present invention, the outer blade frame holding the outer blade is
Just by receiving the elastic piece facing downward provided by the blade frame,
The outer blade can be float-supported.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiment. As shown in FIG. 2, this electric shaver has a plurality of outer blades 1 and a plurality of outer blades 1 each formed as a net blade having a plurality of blade holes. A trimmer blade composed of a comb-shaped fixed blade 3 and a movable blade 4 is provided on both sides of a main blade M composed of an inner blade 2 having an inner blade blade 21 formed on the inner blade base 20. T, T
Are formed by arranging each of them.

As shown in FIG. 3, the outer blade 1 of the main blade M in this case is not only curved in the direction Y orthogonal to the reciprocating direction X of the inner blade 2, but also in the reciprocating direction X of the inner blade 2. Is also curved, and is attached to the outer blade frame 15 formed in a rectangular frame shape. This attachment is performed by inserting a plurality of attachment bosses 16 protruding from the outer cutter frame 15 into the attachment holes 10 provided on both sides of the outer cutter 1. At this time, the mounting holes 10 located at both ends of the outer blade 1 in the reciprocating direction of the inner blade 2
Only the mounting boss 16 inserted into the mounting hole 10 is heat crimped, and the other mounting bosses 16 are simply inserted into the mounting hole 10. This is to make the curvature of the outer blade 1 in the reciprocating direction of the inner blade 2 smooth and to have a required radius of curvature R1, and the arc of the radius of curvature R3 connecting each mounting boss 16 is the outer blade 1. The reason why it has the same center as the arc having the above-mentioned radius of curvature R1 is that the notch 11 is formed at both ends of the outer cutter 1 in the center of the inner cutter 2 in the reciprocating direction and in the direction orthogonal to the reciprocating direction. It is provided for the same reason.

The outer cutter frame 15 to which the outer cutter 1 is attached as described above is integrally provided with elastic pieces 18, 18 whose lower ends are directed outwards at both longitudinal ends thereof, and flat portions 17, 17 are provided on the upper surfaces of both ends. And is attached to the blade frame 8 shown in FIG. The blade frame 8 in the shape of a rectangular tube that opens vertically is provided with locking projections 83 and stoppers 84 located below the locking projections 83 on the inner wall surfaces at both ends in the longitudinal direction. The stopper 84 here has a lower end that is an inclined surface directed inward, and if the outer blade frame 15 is pushed in from below the blade frame 8, as shown in FIG. Is in a state in which the flat surface portion 17 is brought into contact with the lower surface of the locking projection 83 by the upward biasing force generated by the tip of the elastic piece 18 coming into contact with the stopper 84 that is an inclined surface.
The outer blade frame 15 is attached to the blade frame 8 without rattling, and at the same time, it is prevented from being accidentally detached from the blade frame 8 when the blade frame 8 is detached and cleaned. When the outer blade 1 is pressed against the skin, the elastic piece 18 is bent inward and displaced downward along the stopper 84, which is an inclined surface, to sink the outer blade 1 as shown in FIG. If there is no pressing force on the skin, the elastic piece 18 returns to the state shown in FIG. 1 by the urging force.

On the other hand, the inner blade 2 has a large number of inner blades 21.
Are formed in parallel with each other on the upper surface of the inner blade base 20. The inner blade 21 here is
As shown in FIG. 7, an envelope connecting the upper ends of the inner blades 21 is planted so as to form a circular arc 2a having a certain radius of curvature, and one side and the other side in the reciprocating direction are provided with a padding portion 2a.
The direction of 6 is reversed. Further, these inner blades 21 are planted on the inner blade base 20 and then ground up to a point where an arc having a radius of curvature R4 shown in FIG. 2B becomes an envelope connecting the upper ends. When the grinding is performed, the edge angles of the inner blades 21 located at both ends become larger than the edge angles of the inner blade 21 located at the center. For this reason, here, the clearance angle β due to the provision of the catch portion 26 is set to be larger than the opening angle α from the center of the blade edge radius R4 of the inner blades 21 located at both ends. ), The cutting edge angle γ after grinding
So that the angle becomes 90 ° or less, the inner blade blades 2 at both ends
In No. 1 as well, good sharpness is obtained.

The inner blade 2 is reciprocally driven by a driver 7 shown in FIG. A vertically middle portion is pivotally supported by a pin 70 so as to be swingable, and a cam groove 71 with which an eccentric shaft 77 with a balancer attached to an output shaft of a motor 76 engages is provided at a lower end. The driving element 7 in which the inner blade 2 is coupled to the upper end of the inner blade 2 as the motor 76 rotates,
It swings around the pin 70.

The drive element 7 and the inner blade 2 are connected to each other by projecting from the inner blade base 20 in the upper end portion of the drive element 7 which is cylindrical and in which the compression coil spring 25 is housed. The connecting boss 22 is inserted, and the engaging portion 23 protruding on both sides of the connecting boss 22 and the hook 72 provided on the upper end of the driver 7 are prevented from coming off. The joint portion 23 is located in a vertically long groove 73 in the driver 7, and the inner blade 2 is slidable within a predetermined range in the axial direction of the driver 7.

The inner blade 2 of the main blade M constructed as described above reciprocates along an arcuate locus along the inner surface of the outer blade 1 when the motor 76 is rotated. Two
In order to make the reciprocating movement of the inner blade 2 smooth, here, the drive radius R2 of the inner blade 2, that is, the pin 70 supporting the driver element
To the edge of the inner blade 2 at the center of the inner blade 2 is smaller than the radius R1 of the outer blade 1. The distance from the pin 70 to the inner surface of the outer cutter 1 is set to increase toward both ends. As a result, the inner blade 2 has a smaller biasing force received from the compression coil spring 25 as it goes to both ends in the reciprocating direction, and the outer blade 1 is less likely to be stuck.

That is, when the inner blade 2 is located at the center of its reciprocating motion, its moving speed is maximum, so that the outer blade 1
Even if the contact pressure between and is a little higher, the inner blade 21 does not stick to the outer blade 1, and the moving speed decreases toward both ends, so it becomes easier to stick to the outer blade 1, but it goes to both ends. The urging force received from the compression coil spring 25 decreases, and the resistance of the inner blade 2 to the outer blade 1 proportional to this force also decreases, so that the inner blade 21 is less likely to be stuck on the outer blade 1, The inner blade 2 along the inner surface of the outer blade 1 which is curved also in the reciprocating direction of the blade 2.
The reciprocating motion of drawing an arcuate locus is smoothly performed, and since the inner blade 2 does not float above the inner surface of the outer blade 1, the sharpness is not deteriorated.

Further, here, as is apparent from FIG.
Since the radius of curvature R4 of the cutting edge of the inner blade 2 is made smaller than the radius R1 of the outer blade 1 so that the central portion of the inner blade 2 comes into contact with the inner surface of the outer blade 1 first, the inner blade 2 and the outer blade 2 Since the contact with 1 is made evenly over the entire surface and the above-mentioned urging force at both end portions where a catch is likely to occur is lower than that at the central portion, the catch is even less likely to occur.

Further, when the driving force F from the driver 7 is transmitted to the inner blade 2 through the connecting boss 22, the inner blade 2 and the outer blade 1
The contact force of the inner blade 2 on the one end a side that pushes the outer blade 1 in the contacting portion with is larger than that on the b side, but the difference in the resistance at this time is It is proportional to the ratio H / B between the distance B between the blades 21 and the height H from the driving point where the driving force F is transmitted to the inner blade to the tip of the inner blade 21 located at the end. That is, when the pushing-up force of the compression coil spring 25 is P, the reaction force applied to the a side is P / 2 + H.
Since the drag force on the F / B and b sides is P / 2-HF / B, the difference between a and b is 2HF / B, and when this value becomes large, the inner blade 2 easily floats with respect to the outer blade 1. At the same time, the difference in the degree of close contact with the outer blade 1 at both ends of the inner blade 2 increases.

For this reason, here, the inner blade 2 is attached to the driver 7 at the point where the driving force is received from the driver 7 in the connecting boss 22 so that the value of H / B becomes 0.3 or less. The value of H is made smaller by being located above the engaging portion 23, so that the inner blade 2 is prevented from rising from the outer blade 1 and the degree of adhesion between the outer blade 1 and the inner blade 2 is secured. And is doing. According to the experiment, when the radius of curvature of the outer cutter 1 in the reciprocating direction of the inner cutter 2 is about 35 mm or less, the value of H / B is preferably 0.2 or less. In addition, the height position of the point where the driving force is transmitted from the driver 7 to the connecting boss 22 of the inner blade 2 is the lowermost end G (located at the end portion) in the contact portion between the inner blade 21 and the outer blade 1. It is where the lower part of the side edge of the inner blade 21 comes into contact with the outer blade 1, and g from the tip of the inner blade 21
It is effective to bring it closer to where In the figure, G ′ indicates the lowermost end of the contact portion between the inner blade 21 and the outer blade 1 in the central portion of the inner blade 2. When setting the value of H / B in this manner, the type in which the driver 7 swings around the pin 70 may be used instead of the type in which the rotation of the motor 76 is converted into a reciprocating linear motion.

Next, a pair of trimmer blades T arranged on both sides of the main blade M will be described. As shown in FIG. 5, the trimmer blade T includes a base 5, a fixed blade 3 fixed to the curved upper surface of the base 5 by fitting a fitting protrusion 57,
The fitting protrusion 57 is arranged on the upper surface side of the fixed blade 3.
The movable blade 4 is slidably guided by the pressing blade 65, the pressing spring 65 that presses the movable blade 4 toward the fixed blade 3, and the cover 6. The pressing spring 65 has a vertical flat plate portion 66.
When the cover 6 is attached to the cover 6 by engagement with the spring stopper projection 60 and the cover 6 is attached to the base 5 by the hook 61, the vertical flat plate portion 66 is clamped and fixed between the cover 6 and the base 5. Then, the plurality of spring pieces 67 are brought into contact with the upper surface of the movable blade 4.

Further, the base 5 has a pair of locking pieces 50, 50, a pair of hooks 52, 52, and a pair of locking pieces 51, 51 projecting downward, and at the center thereof. The trimmer driver 54 supported by the pair of thin elastic pieces 53, 53 is provided, and the two pairs of locking portions 8 formed on the inner wall surface of the blade frame 8 in the lateral direction.
The locking pieces 50 and 51 are inserted into the blades 1 and 82, and the trimmer driver 54 is pivotally supported by the support shaft 80, whereby the trimmer driver 54 is attached to the blade frame 8. However, of both trimmer blades T, the trimmer driver 5 of one trimmer blade T
The support shaft 80 that supports 4 is provided on a slide button 85 that is vertically slidably attached to the blade frame 8, and the engagement between the engaging portions 81 and 82 and the engaging pieces 50 and 51 is up and down. In addition to being slidable, one of the trimmer blades T also slides up and down as the slide button 85 slides up and down.

The slide button 85 is attached to the blade frame 8 by slidably engaging the hook 86 with the blade frame 8 as shown in FIG. 11, and the support shaft 80 has an L-shaped protrusion. It is provided at the tip of 87. The presence of the support shaft 80 in the projecting piece 87, which is a cantilever, causes rattling in the movement of the trimmer blade T. Therefore, the projecting piece 87 is provided on the inner surface of the blade frame 8. A pair of L slidably engaged with both ends of the
The letter-shaped ribs 88, 88 are provided to stabilize the position of the support shaft 80.

The lower end of the trimmer driver 54, whose upper end is an engaging portion 55 for engaging the movable blade 4, engages with the drive projection 75 provided on the driver 7, and the driver 7 It is the engaged portion 56 whose movement is transmitted to the trimmer driver 54. When the driver 7 swings, the trimmer driver 5
Reference numeral 4 swings around the support shaft 80, and reciprocally slides the movable blade 4, which is also formed in a comb shape, with respect to the fixed blade 3, which is formed in a comb shape. The engaging portion 55 and the engaged portion 56 are positioned on the same straight line in the vertical direction so that the trimmer driver 54 is not easily twisted.

Here, from the support shaft 80 to the engaged portion 5
Since the length L1 up to 6 is shorter than the length L2 from the support shaft 80 to the movable blade 4 as shown in FIG. Blade 4
The reciprocating stroke is long enough. Also,
With respect to the trimmer blade T on the side supported by the support shaft 80 of the slide button 85, the driver 7 has two upper and lower drive protrusions 7.
5 and 75, the upper drive projection 75 is engaged with the engaged portion 56 when the slide button 85 is moved upward to move the trimmer blade T upward. However, at this time, the swing strokes of the upper and lower two drive projections 75, 75 are different, and the swing stroke of the upper drive projection 75 is larger than that of the lower drive projection 75. The vertical distance E between the two drive projections 75, 75 is made smaller than the vertical slide amount of the slide button 85 so that the reciprocating stroke of the movable blade 4 does not change even if the trimmer blade T is moved up and down.

Further, the trimmer blade T here cuts hair in cooperation with the main blade M, that is, long hair is trimmer blade T.
In order to smoothly perform the operation of cutting the short bristles after cutting with the trimmer blade T and further cutting with the main blade M, the main blade M in the reciprocating direction of the inner blade 2 Although it is curved like,
At this time, the ridge line of the outer blade 1 of the main blade M and the sliding surface of the trimmer blade T between the movable blade 4 and the fixed blade 3 maintain a constant distance D in the entire region, as shown in FIGS. Is done. The distance L2 from the support shaft 80 to the movable blade 4
Is set to be smaller than the distance L0 from the sliding surface to the center of the arc of the engaging portion 55 and the upper surface of the movable blade 4 when the engaging portion 55 of the trimmer driver 54 moves the movable blade 4. This is because the angle formed between the two is obtuse. When this angle is an acute angle, a situation occurs in which the engaging portion 55 presses the movable blade 4 and sandwiches the movable blade 4 with the fixed blade 3, and smooth driving cannot be expected.

By the way, when the fixed blade 3 and the movable blade 4 are curved in the sliding direction, it becomes difficult to bring the movable blade 4 into close contact with the fixed blade 3 with no gap in the entire area. As shown, the radius of curvature of the fixed blade 3 is smaller than that of the movable blade 4, and when assembled,
That is, when the movable blade 4 is pressed against the fixed blade 3, the movable blade 4 comes into close contact with the fixed blade 3. Further, when forming the movable blade 4, as shown in FIG. 10 (b), after being formed and curved so as to have a convex bent shape in its cross section as in the fixed blade 3, Figure 1
As shown in 0 (c), the lower surface is ground so as to be flush with the movable blade 4 to reduce the rigidity in the reciprocating direction so that the fixed blade 3 can be firmly attached. There is. Furthermore, the cutting edge portion of the movable blade 4 is, as shown in FIG.
Since it is inclined at an angle δ toward the fixed blade 3 side,
When the movable blade 4 is pressed against the fixed blade 3, it comes into close contact with the fixed blade 3 from the cutting edge side, and good sharpness is obtained. Since the fixed blade 3 side has a convex shape in its cross section, the driving load does not increase due to the friction between the fixed blade 3 and the movable blade 4.

The outer cutter frame 1 shown in FIG. 13 has a finger hooking projection 150 at its lower end and a positioning boss 151 on its side surface. The finger hooking protrusion 150 is used when the outer blade frame 15 attached to the blade frame 8 by the engagement of the elastic piece 18 and the stopper 84 is detached from the blade frame 8 by hooking the finger and pulling it downward as described above. , An outer cutter frame 15 having elastic pieces 18, 18 at both longitudinal ends
It is provided near one end of. This is because it is possible to raise the outer cutter frame 1 by placing a finger on the finger-hanging protrusion 150 and using the elastic piece 18 on the other end side of the outer cutter frame 1 as a fulcrum. Further, the positioning boss 151 prevents the outer cutter frame 15 and the outer cutter 1 from vibrating in the longitudinal direction when the inner cutter 2 is operated by the engagement with the groove of the engaging portion 82 provided on the inner surface of the blade frame 8. This is for the purpose of providing a side surface near the other end opposite to the finger hook projection 150. The one provided at this position
This is because the outer blade frame 15 can be easily removed using the finger hooking protrusion 150.

FIG. 14 shows another example of the inner blade 2, in which the inner blade base 2 is formed so that the envelope connecting the upper ends has an arc shape.
Through holes 210 are provided in a large number of inner blade blades 21 arranged on 0 to allow cut whiskers to pass through the inner blade blades 21, and at the both ends of the inner blade base 20 in the longitudinal direction. An inclined surface 200 which is inclined downward at the center in the width direction
Is formed so that the beard scraps can easily fall from above the inner blade base 20. In addition, in order to improve the rigidity of the inner blade blade 21 located in the central portion, which is most used for beard cutting, among a large number of inner blade blades 21,
A reinforcing rib 201 is provided on the upper surface of the central portion of the inner blade base 20 in the longitudinal direction, and the inner blades 21 are connected by the reinforcing rib 201. The protrusions 220, 220 provided on the connecting boss 22 in the longitudinal direction of the inner blade 2 reduce engagement rattling with the driver 7.

Further, in the trimmer blade T shown in FIG. 15, the groove 300 is provided on the upper surface of the fixed blade 3, and the notch 3 connected to the groove 300 is formed on the edge opposite to the cutting edge 302.
03 at intervals, the cutting edge 30 of the fixed blade 3
Only on the upper surface on the second side and on the upper surface of the convex portion 301 at the edge opposite to the cutting edge 302 and having the notch 303 therebetween,
The movable blade 4 is in sliding contact. The sliding contact surface with the movable blade 4 is reduced. In addition, the convex portion 3
01 is provided at a position corresponding to the spring piece 67 of the pressing spring 65 to prevent the movable blade 4 from being deformed by pressing.

[0030]

In the present invention as described above, according to the present invention, the upper
Install an elastic piece facing downward from the outer blade frame where the outer blade is arranged.
The elastic piece is attached to the blade frame surrounding the outer blade frame.
A stopper is provided so that it can be received by the stopper.
For the float that biases the outer blade frame upward with the elastic piece
Since the elastic force is obtained , the outer blade can be float-supported, and the float structure of the outer blade and the outer blade frame can be obtained at low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment.

FIG. 2 is a transverse sectional view of the above.

FIG. 3 is an exploded perspective view of the main blade of the above.

FIG. 4 is an exploded perspective view of the above-mentioned motor and driver.

FIG. 5 is an exploded perspective view of a pair of trimmer blades of the same.

FIG. 6 is a cutaway perspective view of the above blade frame.

FIG. 7 shows an inner blade of the main blade of the above, (a) is a front view, and (b) is an enlarged sectional view of a portion A.

FIG. 8 is a vertical sectional view showing the above-mentioned trimmer blade.

FIG. 9 is a front view showing the radii of curvature of the inner blade and the outer blade of the main blade of the same.

FIG. 10 shows the same trimmer blade, (a) is a front view showing the radii of curvature of the fixed blade and the movable blade, (b) is a sectional view of the movable blade before the grinding step, and (c) is It is sectional drawing in the state after a grinding process.

FIG. 11 is a perspective view of the slide button and the blade frame of the same.

FIG. 12 is a vertical cross-sectional view showing the float state of the above.

FIG. 13 is a perspective view showing another example of the outer blade frame.

FIG. 14 is a perspective view showing another example of the inner blade.

FIG. 15 is an exploded perspective view of another example of the above trimmer blade.

[Explanation of symbols]

1 outer blade 8-blade frame 15 Outer blade frame 18 Elastic piece 84 stopper

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-2-109587 (JP, A) JP-A-2-52687 (JP, A) JP-A-63-97193 (JP, A) JP-A-63- 181787 (JP, A) Actual Kaihei 2-148666 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B26B 19/00-19/48

Claims (5)

(57) [Claims] 1. In a reciprocating electric shaver in which an outer cutter frame holding an outer cutter is floatably attached to a blade frame up and down , a reciprocating electric shaver has a lower end from an outer cutter frame having an outer cutter disposed on an upper portion thereof.
It provided with a resilient piece facing, by providing a stopper for said elastic piece is in contact with the blade frame surrounding the outer cutter frame,該Su
The elastic piece received by the topper urges the outer blade frame upward.
A reciprocating electric razor having the elastic force for the float . 2. A surface of the stopper which receives the elastic piece is obliquely upward.
It is equipped with an inclined surface facing toward
The reciprocating electric razor according to claim 1, wherein the reciprocating electric razor is in contact with a slope . 3. The reciprocating electric shaver according to claim 1, wherein the outer cutter frame is provided with a finger hook projection for attachment and detachment. 4. A longitudinal direction which intersects the vertical direction of the outer cutter frame
Elastic pieces are provided at both ends, and the finger hooks are outer blades.
The reciprocating electric razor according to claim 3, wherein the reciprocating electric razor is provided near one end in the longitudinal direction of the frame . 5. The outer cutter frame outer cutter frame relative to the blade frame to engage the blade frame in the longitudinal direction near the other end longitudinal
The reciprocating electric shaver according to claim 4 , further comprising a positioning boss for preventing vibration .