JP3383680B2 - 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 in which an outer cutter is curved in the reciprocating direction of an inner cutter.

[0002]

2. Description of the Related Art In a reciprocating electric shaver, an outer blade is generally curved only in a direction orthogonal to the reciprocating direction of the inner blade, and has an arcuate cross-section that is not curved in the reciprocating direction of the inner blade. However, in this case, when shaving the hair in a recessed area such as the submandibular region or the armpit, the outer blade does not adhere to the skin, and thus the hair cutting efficiency is greatly reduced.

For this reason, as disclosed in Japanese Patent Publication No. 57-53748, the outer blade is curved even in the reciprocating direction of the inner blade, and the inner blade slidably contacts the inner surface of the outer blade.
There is a reciprocating electric shaver in which the envelope of the upper end in the reciprocating direction is arcuate and the inner blade reciprocates along the inner surface of the outer blade.

[0004]

However, in the case of being curved in this way, the curvature of the inner surface of the outer blade is greater than that in the case where the outer blade is curved only in the direction orthogonal to the reciprocating direction of the inner blade. Since it is difficult to exactly match the radius and the radius of curvature of the envelope of the inner blade, it is difficult to secure the adhesion between the outer blade and the inner blade, and it is difficult to obtain good sharpness.

The present invention has been made in view of the above points, and an object thereof is to easily secure the adhesion between the inner blade and the outer blade which is curved even in the reciprocating direction of the inner blade. To provide a reciprocating electric razor that can.

[0006]

SUMMARY OF THE INVENTION The present invention, however, includes an outer blade having a large number of blade holes, and an inner blade which is reciprocally driven and slidably contacts the inner surface of the outer blade, and the outer blade reciprocates. Reciprocating at the upper edge of the inner blade , which is curved in the direction and makes sliding contact with the inner surface of the outer blade
In a reciprocating electric shaver in which the inner blade having an arcuate envelope in the moving direction reciprocates along the curved surface of the outer blade, in the reciprocating direction of the inner blade, the radius of curvature of the outer blade Also the above envelope in the reciprocating direction of the inner blade
Is characterized in that the inner cutter with which to reduce the radius of curvature to bias the radial is provided a spring for pressing the outer cutter inside surface.

[0007]

According to the present invention, since the inner blade is urged in the radial direction by the difference in the radii of curvature and the spring, the inner blade end portion is surely contacted with the central portion of the inner blade in contact with the outer blade. Since the outer cutter comes into contact with the outer cutter, the degree of adhesion of the outer cutter with the inner cutter is improved.

At this time, the outer cutter is attached to the outer cutter frame at both ends in the reciprocating direction of the inner cutter, and the mounting boss for supporting the outer cutter on the outer cutter frame is bent in the inner cutter reciprocating direction. If they are arranged on an arc concentric with the arc formed by, or if a notch is provided at the end of the outer blade in the central part in the reciprocating direction of the inner blade and in the direction orthogonal to the reciprocating direction, Since it can be brought into a non-curved state, the adhesion with the inner blade is further improved.

Further, in the case where both the main blade and the trimmer blade arranged in parallel with the main blade are curved in the reciprocating direction of the inner blade of the main blade, the main blade and the trimmer blade can be easily applied to the depressed skin. If the ridgeline of the main blade and the sliding contact surface of the fixed blade and the movable blade of the trimmer blade have a constant interval over the entire area, long hair is cut with the trimmer blade and the main blade Therefore, the cooperative operation of shaving it shortly can be efficiently performed in the entire area.

The trimmer blade attached to the main blade is composed of a comb-teeth-shaped fixed blade and a movable blade which is comb-teeth-shaped and slidably contacts the fixed blade. The fixed blade and the movable blade are arranged in the reciprocating direction of the movable blade. In addition to being curved, at least one of the movable blade and the fixed blade is formed to have a convex cross-section and is ground until one surface is flush with the cutting edge portion in the curved state. Is less rigid,
It becomes easier to follow the other blade, and the adhesion between the fixed blade and the movable blade is improved.

At this time, if the blade tip is inclined toward the other blade, the adhesion at the blade tip can be ensured more reliably.

[0012]

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 blade frame 15 to which the outer blade 1 is attached in this manner 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 inclined surfaces 84 located below the locking projections 83 on the inner wall surfaces at both ends in the longitudinal direction.
When the outer blade frame 15 having the elastic pieces 18 protruding from both ends in the longitudinal direction and having the flat portions 17 on the upper surfaces of both ends is pushed in from the lower side of the blade frame 8, as shown in FIG. Is in a state in which the flat 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 inclined surface 84.
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.

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, and the inner blade blades 21 here connect the upper ends of the inner blade blades 21 as shown in FIG. 7. The envelope is planted so as to form a circular arc 2a having a certain radius of curvature, and the direction of the hanging portion 26 is reversed on one side and the other side in the reciprocating direction. 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. The inner blade 21 located at the center when ground to
The blade angles of the inner blades 21 located at both ends are larger than the blade angles of. 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 blade edge angle γ after grinding is set to 90 ° or less so that the inner blades 21 at both ends can also have good sharpness.

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 driving element 7 at the point where the driving force is received from the driving element 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 lower end of the trimmer driver 54, whose upper end is the engaging portion 55 for engaging the movable blade 4, engages with the drive projection 75 provided on the driver 7, and the driver 7
Engaged portion 56 whose movement is transmitted to the trimmer driver 54
Has become. When the driver element 7 swings, the trimmer driver element 54 swings around the support shaft 80 and is also formed in a comb tooth shape with respect to the fixed blade 3 formed in a comb tooth shape. The movable blade 4 is slid back and forth. 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 8
As shown in FIG. 2, the length L1 up to 5 is shorter than the length L2 from the support shaft 80 to the engaging portion 80, so that power is taken from the middle of the driver element 7, Movable 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 with the main blade M, the trimmer blade T in the reciprocating direction of the inner blade 2 in the main blade M can be smoothly operated. Is also curved,
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 without a 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), the movable blade 4 is formed to have a convex bending shape in its cross section as in the case of the fixed blade 3 and is then curved. 10
As shown in (c), by grinding the lower surface so as to be flush, the rigidity of the movable blade 4 in the reciprocating direction is reduced, and the fixed blade 3 is firmly attached. . 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.

[0029]

As described above, in the present invention, the radius of curvature of the curvature of the outer cutter in the reciprocating direction of the inner cutter is
The envelope in the reciprocating direction of the upper end of the inner blade that slides against the inner surface of the outer blade
Since the radius of curvature of the tangent line is small, the inner blade edge also contacts the outer blade with the center of the inner blade firmly contacting the outer blade by simply pressing the inner blade against the outer blade with a spring. Therefore, the degree of adhesion of the outer blade to the inner blade is improved, and good sharpness can be secured.

If both the main blade consisting of the inner blade and the outer blade and the trimmer blade arranged in parallel with the main blade are curved in the reciprocating direction of the inner blade of the main blade, both of them have a dented skin. The main edge of the trimmer blade and the sliding contact surface of the fixed blade and the movable blade of the trimmer blade have a constant interval over the entire area, so that long hair is trimmed by the trimmer blade. Since the coordinated operation of cutting the hair and cutting it up with the main blade can be performed efficiently over the entire area, the hair in the recessed area can be surely and shortly shaved.

Further, in a trimmer blade attached to a main blade composed of an inner blade and an outer blade, the fixed blade and the movable blade are curved in the reciprocating direction of the movable blade to improve the adhesion to the dented skin, At least one of the movable blade and the fixed blade is formed in a convex shape in cross section, and if the rigidity is reduced by grinding until one surface is flush with the cutting edge portion in the curved state, it can be said that it is curved as described above. However, it is easy to follow the other blade, and therefore the fixed blade and the movable blade have good adhesion, so that the sharpness does not deteriorate.

If the blade tip is inclined toward the other blade, the adhesion at the blade tip can be ensured more reliably.

[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.

[Explanation of symbols]

1 outer blade 2 inner blade R1 outer radius R4 inner blade radius

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-352988 (JP, A) JP-A-4-343883 (JP, A) Actually opened 50-3788 (JP, U) Actually opened 50- 3789 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B26B 19/04

Claims (10)

(57) [Claims] 1. An outer blade having a large number of blade holes, and an inner blade that is reciprocally driven to slidably contact the inner surface of the outer blade, and the outer blade is curved in the reciprocating direction of the inner blade and slides on the inner surface of the outer blade. Touch
The inner edge of the inner blade in the reciprocating direction has a circular arc shape.
In a reciprocating type electric shaver that performs reciprocating blade along the curved surface of the outer inner cutter are I, than the curvature radius of the curvature of the outer blade in the reciprocating direction of the inner cutter reciprocating direction of the inner blade
In the reciprocating electric shaver, the radius of curvature of the envelope is reduced, and a spring is provided to urge the inner blade in the radial direction to press it against the inner surface of the outer blade. 2. The reciprocating electric shaver according to claim 1, wherein the outer blade is attached to the outer blade frame at both ends in the reciprocating direction of the inner blade. 3. The mounting boss for supporting the outer cutter of the outer cutter frame is arranged on an arc concentric with the arc formed by the curve of the outer cutter in the inner cutter reciprocating direction. Reciprocating electric razor. 4. The reciprocating electric machine according to claim 1, wherein the outer blade has a notch at a central portion in the reciprocating direction of the inner blade and at an end portion in a direction orthogonal to the reciprocating direction. Razor. 5. A main blade comprising an outer blade having a large number of blade holes and an inner blade which is reciprocally driven to slidably contact an inner surface of the outer blade, a fixed tooth having a comb tooth shape, and a fixed tooth having a comb tooth shape and slid on the fixed blade. The main blade and the trimmer blade arranged in parallel with each other are curved in the reciprocating direction of the inner blade of the main blade, and the ridge line of the main blade and the trimmer blade are provided. The reciprocating electric shaver according to claim 1, wherein the fixed blade and the slidable contact surface of the movable blade have constant intervals over the entire area. 6. A trimmer drive element that is rockably driven to engage a drive element that drives an inner blade of a main blade to receive a power to drive a movable blade is swingably supported by a support shaft. The reciprocating electric machine according to claim 5, wherein the distance from the support shaft to the engagement point with the movable blade is longer than the distance from the support shaft to the engagement point with the driver. Razor. 7. The driver element is provided with a plurality of engaging portions for engaging with the trimmer driver element in the vertical direction according to the vertical position of the vertically movable trimmer blade, and the vertical intervals of the engaging portions are the same as those of the trimmer blade. The reciprocating electric razor according to claim 6, wherein the reciprocating electric razor is smaller than the vertical movement amount. 8. A spring for pressing the movable blade of the trimmer blade against the fixed blade includes a base to which the fixed blade is fixed and a flat plate portion that is clamped and fixed between the movable blade and the cover that covers the spring. The reciprocating electric razor according to claim 5. 9. A main blade comprising an outer blade having a large number of blade holes and an inner blade which is reciprocally driven to slidably contact the inner surface of the outer blade, a fixed tooth having a comb tooth shape and a fixed tooth having a comb tooth shape and slid on the fixed blade. The trimmer blade is provided with a movable blade in contact with the trimmer blade, and the trimmer blade has the fixed blade and the movable blade curved in the reciprocating direction of the movable blade, and at least one of the movable blade and the fixed blade is formed to have a convex cross-section. 2. The reciprocating electric shaver according to claim 1, wherein the curved surface is ground until one surface thereof is flush with the cutting edge portion. 10. The reciprocating electric shaver according to claim 9, wherein the blade edge is inclined toward the other blade side.