JP4662239B2 - Rotary electric razor - Google Patents

Description

  The present invention relates to a rotary electric razor in which an inner blade is rotated while being brought into sliding contact with a substantially disk-shaped outer blade, and a wrinkle entering a slit of the outer blade is cut by the inner blade.

  In this type of electric razor, one having an improved shaving taste by allowing the outer blade to move up and down (can sink) is known. In this case, if the outer blade is inclined not only in the vertical direction but also in any direction, and the outer blade is inclined along the curved surface of the shaving surface, the adhesion between the outer blade and the shaving surface is improved. In addition, the shaving taste is further improved.

Special table hei 9-503424 JP-A-2-213378 6-31660

  Japanese Patent Application Laid-Open No. 2004-151867 describes that the outer blade can be freely moved in the vertical direction and can be tilted in an arbitrary direction. Here, a skin support rim (outer blade ring) surrounding the outer periphery of the outer blade is provided, and a flange-like protrusion that protrudes toward the outer diameter side of the outer blade is provided on the skin support rim. The surface is slidably engaged with the hemispherical engagement surface on the outer blade holder (outer blade frame) side. This skin support rim has a function of preventing the outer peripheral edge of the outer blade from sinking deeply into the skin and excessively shaving or damaging the skin when the outer blade is strongly pressed against the skin.

  In Patent Document 2, a blade head and a motor are integrated so that the head and the motor can swing in an arbitrary direction with respect to the main body. Here, a spherical shell and a ball are respectively formed on the housing and the main body of the blade head. A cap-shaped bearing shell is formed, and both shells are slidable with respect to each other. In Patent Document 3, as in Patent Document 2, the blade head and the motor are integrated so as to be swingable with respect to the main body, but the head is connected to the main body with four links, and the conical coil is used. This is different from Patent Document 2 in that the motor is pressed in the direction of the outer blade.

  Since the outer diameter side of the skin support rim surrounding the outer periphery of the outer blade is slidably engaged with the outer blade holder, the outer blade and the outer blade holder surrounding the outer blade are in the radial direction. It is inevitable that it will grow larger. For this reason, the blade unit and blade head part which consist of one outer blade, an inner blade, and components accompanying these increase in size. Moreover, when it has a some blade unit, the space | interval of each blade unit spreads and the problem that a usability | use_condition worsens arises.

  In Patent Documents 2 and 3, since the blade head and the motor are integrated and the whole swings with respect to the main body, the swinging portion is enlarged and the head is enlarged. In addition, these outer blades are not movable in the vertical direction (centerline direction of the outer blades), so if the outer blades are pressed hard against the skin, the outer blades will sink deeply into the skin, resulting in deep shaving or damage to the skin. There was also a fear. In particular, since there is no skin support rim as in Patent Document 1, there is a problem that it is easier to shave.

  The present invention has been made in view of such circumstances, and has an outer blade ring having a function of a skin support rim, so that there is no risk of shave or tingling of the skin, and the outer diameter of the blade unit is reduced. Provided is a rotary electric razor that can reduce the size of the blade head, and in the case of having a plurality of blade units, can narrow the interval between the blade units to reduce the size of the blade head and improve the feeling of use. For the purpose.

According to the present invention, this object is achieved by holding a substantially disc-shaped outer cutter on the outer cutter frame mounted on the upper part of the main body portion incorporating the motor so as to be movable up and down, and loading the inner side of the outer cutter from below. In a rotary electric shaver that includes a blade unit that rotationally drives an inner blade while elastically pressing the inner blade toward the outer blade by a drive shaft that is rotationally driven by the motor, the blade unit is coaxial with the drive shaft on the main body. And a case holder having a case support portion located on a hemispherical surface that opens upward from within the diameter of the outer blade and from below the outer blade, and is optionally in sliding contact with the case support portion of the case holder A substantially bowl-shaped swinging case that is held by a case cradle so as to be swingable in the direction and that surrounds the lower part of the outer blade and the inner blade and that is prevented from falling upward on the inner diameter side thereof , Upper edge of moving case An outer cutter ring which is detachably fixed and engages with the outer peripheral edge of the outer cutter to hold the outer cutter up and down within a certain range, and a return which returns the swinging case to a position coaxial with the case cradle. A rotary electric razor comprising: a spring; wherein the swing case is swingable in an arbitrary direction together with the outer blade by sliding the swing case on a case support portion of the case base. The

  Since the outer periphery of the outer blade is surrounded by the outer blade ring, there is no risk that the outer peripheral edge of the outer blade will sink deeply into the skin, resulting in deep shaving or tingling of the skin.

  The outer cutter ring is detachably fixed to the upper edge of the swing case that covers the lower part of the outer and inner blades from below, and this swing case is supported by the case holder located below the outer and inner blades. The swinging case swings in any direction on the spherical surface of these case support portions because it is slidably brought into contact with the portion and held so as to swing in any direction. On the other hand, since the outer blade is biased upward by the inner blade biased upward by the drive shaft, the outer blade can move up and down together with the inner blade within a vertically movable range between the outer blade ring and the outer peripheral edge of the outer blade. . For this reason, the outer blade can smoothly follow the unevenness of the skin, and the shaving taste is improved.

  Since the outer blade is swingably held by the swing case and the case cradle positioned below, the blade unit does not have a large radial dimension of the outer blade. That is, the case support portion is located not in the radial direction of the outer blade but in the lower side of the outer blade. For this reason, the blade head portion can be miniaturized. In the case where a plurality of blade units are provided, the interval between the blade units can be narrowed to reduce the size of the head and improve the feeling of use.

  It is desirable that the swing center of the swing case, that is, the center of the hemispheric surface where the case support portion of the case cradle is located be positioned near the surface center of the outer cutter. In this case, the outer cutter swings about the fulcrum (P) near the center of the surface, so that the outer cutter swings smoothly.

The case base is provided with a spherical plate portion extending in the inner diameter direction substantially along the hemispherical surface that opens upward within the diameter of the outer cutter, and the swinging case held by the case base has a ball of the case base A tongue-like hook that is slidably engaged from the inner diameter side can be provided on the lower surface of the face plate portion (claim 3). In this case, the reaction force that the drive shaft presses the outer blade upward is received by this hook, so that the swinging case is prevented from falling upward and the movable range of the outer blade is increased to smooth the movement. Can do.

  The swing case is provided with a cylindrical portion protruding downward through the inner diameter side of the spherical plate portion of the case pedestal, and a conical coil serving as a return spring for returning the swing case between the cylindrical portion and the case pedestal If a spring is loaded, it is suitable for generating a sufficient restoring force for returning the inclination of the swing case to an upright position with a very simple configuration (claim 4).

  The swing case is provided with a plurality of hooks protruding upward from the inner diameter side and bent at the inner end side in a hook shape so that these hooks prevent the inner blade from coming out of the swing case upward. When the outer blade ring is removed from the swing case and the vicinity of the inner blade is cleaned, the inner blade is held by the swing case. Therefore, the cutting edge can be cleaned while the inner blade is held in the swing case, and the workability is good.

  A plurality of blade units are held in the outer blade frame, and if the outer blades of each blade unit can be moved up and down independently and swingable in any direction, it is possible to shave efficiently (Claim 6). . Since each blade unit is small in the radial direction, the interval between the outer blades is narrowed, the shaving surface of the blade head portion is reduced, and the blade head portion can be reduced in size, which makes it easy to use. In this case, it is possible to integrally form a case pedestal provided in a plurality of blade units. If the case pedestal is integrally formed, the number of parts is reduced, and not only assembly / disassembly is facilitated, but also the structure is simplified.

  1 is an external perspective view of one embodiment of the present invention, FIG. 2 is an enlarged perspective view of the blade head portion, FIG. 3 is an exploded perspective view, FIG. 4 is a side sectional view of one blade unit, and FIG. It is a disassembled perspective view which shows two blade units except an outer blade and an inner blade. FIG. 6 is also an exploded side sectional view, and FIGS. 6A and 6B are cross-sectional views taken from different directions (directions different by 90 °). FIG. 7 is a plan view showing a combined state of the swing case and the case cradle, FIG. 8 is a side cross-sectional view showing a part thereof omitted, and FIG. 9 is a side cross-sectional view showing a state where the outer blade and the swing case are tilted. It is.

  In FIG. 1, reference numeral 10 denotes a main body portion, and 12 denotes a blade head portion attached to the upper portion thereof so as to be openable and detachable. This blade head portion 12 incorporates three sets of blade units 16 (see FIGS. 4 and 9) formed by an outer blade 14, an inner blade swing case 48 to be described later, a case pedestal 50 and the like. The three outer blades 14 corresponding to the three blade units 16 are located at the vertices of an equilateral triangle.

  The blade head portion 12 has an outer blade frame 18 that can be opened and closed upward or detachable with respect to the main body portion 10. The outer blade frame 18 is formed with three outer blade mounting holes 20 from which the outer blade 14 can protrude (see FIG. 3). The outer blade 14 is made of a metal plate and has a substantially disc-shaped cap shape. A large number of slits 22 (FIG. 4) are formed substantially radially in the circular portion of the outer cutter 14.

  A substantially triangular substrate 24 is fitted on the upper surface of the main body 10. From this board | substrate 24, the three drive shafts 26 located under the center axis | shaft of each outer blade 14 protrude toward the upper direction. As shown in FIG. 4, the drive shaft 26 includes a rotary shaft 30 that is rotationally driven by an electric motor (not shown) built in the main body 10, a lower joint 32 that is fixed to the rotary shaft 30, and the lower joint. The upper joint 34 slidably engages with the upper joint 34, the compression coil spring 36 biases the upper joint 34 upward, and the joint cap 38 that encloses the joint between the lower joint 32 and the upper joint 34.

  Here, the upper part of the lower joint 32 is formed by forming a plurality of grooves 32a in the axial direction in an expanded cylinder. The lower part of the upper joint 34 enters the cylinder, and a plurality of protrusions 34a protruding from the outer periphery of the entry part are engaged with the groove 32a from the inner diameter side. The lower part of the coil spring 36 is guided by the outer periphery of the rotating shaft 30 protruding into the cylinder of the lower joint 32 and comes into contact with the inner bottom surface of the cylinder. The upper part of the coil spring 36 abuts on the inner top surface of a spring loading chamber 34 b formed in the upper joint 34. The joint cap 38 surrounds the outer periphery of the cylinder of the lower joint 32 and engages with the lower surface and the opening edge of the cylinder to restrict axial movement. As a result, the protrusion 34a of the upper joint 34 is restricted from escaping upward from the groove 32a. Note that an engagement head 34 a having a substantially spherical shape in a side view and a substantially rectangular shape in a plan view is formed at the upper end of the upper joint 34.

  The inner blade 40 has a resin boss portion 42 formed in a cup shape that opens downward, and a large number of blade bodies 44 that surround the boss portion 42 and are annularly fixed at equal intervals in the circumferential direction. The multiple blade bodies 44 may be connected in an annular shape.

  As shown in FIG. 4, two annular tracks 14 a and 14 b having different diameters are formed on the inner surface (lower surface) of the outer blade 14, and the blade body 44 of the inner blade 40 branches into a bifurcated shape. The branched portion, that is, the two small blades 44a and 44b are in sliding contact with the tracks 14a and 14b from below. A cap 46 having an engagement hole that opens downward is fixed to the center portion of the outer blade 14, and the upper end of the boss portion 42 of the inner blade 40 is engaged with the engagement hole, so that the shaft runout of the inner blade 40 is caused. Is prevented. The boss portion 42 is formed with an engagement hole 42a having a rectangular shape in plan view that opens downward, and a rectangular spherical engagement head portion 34a formed in the upper joint 34 of the drive shaft 26 is engaged with the boss portion 42 from below.

  48 is a swing case, and 50 is a case cradle. As shown in FIG. 5, the swing case 48 is formed in a substantially bowl shape that opens upward, and is divided separately for each blade unit 16. That is, it has three swing cases 48. Three case holders 50 corresponding to the three blade units 16 are connected and integrated.

  The case cradle 50 is held on the outer blade frame 18 fixed to the main body 10 so as to be coaxial with the drive shaft 26. That is, a knob 52 passes through the center of the case pedestal 50, and an engaging portion 52a whose tip is formed in a triangle in plan view (refer to the AA cross-sectional view in FIG. 4) is formed integrally with the knob 52. It is fixed. The engaging portion 52a can enter from below the triangular pillar portion 18a that is projected from the center inner surface of the outer blade frame 18 from below, and can be engaged with the three engaging holes 18b provided in the side wall of the pillar portion 18a. It is.

  That is, by grasping the knob 52 and inserting the triangle of the engaging portion 52a so as to coincide with the triangle of the column portion 18a and rotating about 60 °, the vicinity of the apex of the triangle of the engaging portion 52a is inserted into the engagement hole 18b of the column portion 18a. Can be engaged. A coil spring 54 is loaded in the pillar portion 18a. The coil spring 54 presses the engaging portion 52a downward with the engaging portion 52a engaged with the engaging hole 18b, and the knob 52 is provided with the pillar 52. This prevents the part 18a from coming off.

  A claw 52 b that engages with the upper surface of the case cradle 50 is formed at the upper end of the knob 52, and a coil spring 56 is mounted between the lower surface of the case cradle 50 and the lower end flange portion of the knob 52. As a result, the case cradle 50 is held by the knob 52 while being sandwiched between the claw 52 b and the coil spring 56.

In this way, the upper surface of the case pedestal 50 held on the main body 10 side is located above the center line of the drive shaft 26, that is, on the hemisphere centered on the fulcrum P near the central upper surface of the outer blade 14. A plurality of case support portions 58 are formed (see FIG. 5). In other words, the case cradle 50 has a pair of arcuate and spherical spherical plate portions 60 extending in the inner diameter direction from symmetrical positions across the center line, and both edges in the circumferential direction of both spherical plate portions 60 are slightly upward. The projecting ridges are protruded, and the total four ridges form the case support portion 58. These case support portions 58 are located below the diameter of the outer cutter.

  The swing case 48 is mounted on the case pedestal 50 from above, and its lower surface is formed in a substantially hemispherical shape, and is slidably supported on the four case support portions 58. The swing case 48 is formed with a tongue-like hook 62 that engages with the lower surface of the spherical plate 60 from the inner diameter side of the spherical plate 60 of the case cradle 50. Two hooks 62 are formed in total, one for each spherical plate 60. The swing case 48 is inserted into the case holding base 50 from above, and one hook 62 is inserted into the lower surface of one spherical plate portion 60 and tilted to one side along the spherical surface. The spherical plate 60 is attached to the case cradle 50 by passing through a notch 64 (FIGS. 5 and 6) formed in the inner peripheral edge of the spherical plate 60.

  In this state, the swing case 48 slides on the spherical surface while being in sliding contact with the case support portion 58 from above while being prevented from falling upward by the two hooks 62. A protrusion 66 (FIGS. 5 and 8) is formed on the lower surface of the spherical plate portion 60 of the case pedestal 50 to engage the hook 62 and restrict the swinging case 48 from excessively rotating in the circumferential direction. Yes.

  The swing case 48 has a cylindrical portion 68 (FIGS. 4 to 8) that protrudes downward through the inner diameter side of the spherical plate portion 60 of the case pedestal 50, and between the lower edge of the cylindrical portion 68 and the case pedestal 50. Is loaded with a conical coil spring 70. The coil spring 70 provides a restoring force that returns the swing case 48 to the vertical position (FIG. 4).

  Further, four hooks 72 project upward from the upper edge of the cylindrical portion 68 of the swing case 48. The hook 72 can be bent with elasticity in the outer diameter direction, the tip is bent inwardly in the shape of a bowl, and the tip is an annular convex portion 74 (formed on the lower outer periphery of the boss portion 42 of the inner blade 40 ( 4 and 6) with a sufficient gap to prevent the inner blade 40 from falling off the swing case 48.

  The outer blade 14 and the outer blade ring 76 are detachably attached to the upper opening of the swing case 48. The outer cutter ring 76 is engaged with a flange 14 c (FIG. 4) provided on the outer periphery of the outer cutter 14 from above to surround the outer periphery of the outer cutter 14, and two hooks 78 projecting from the lower edge of the outer cutter ring 76. Is attached to the swing case 48 by engaging with a bending engagement groove 80 provided on the outer periphery of the swing case 48 from above.

  That is, the bending engagement groove 80 opens upward, and the lower part is bent in an L shape in the circumferential direction, while the lower end of the hook 78 of the outer cutter ring 76 is engaged with the bending engagement groove 80 from above. The outer cutter ring 76 is rotated in the circumferential direction along the bent engagement groove 80. The flange 14c of the outer blade 14 can move a certain amount downward relative to the outer blade ring 76.

  Next, the operation of this embodiment will be described. In the state of FIG. 4, that is, when no external force is applied to the outer blade 14, the upper joint 34 of the drive shaft 26 is biased upward by the coil spring 36, so that the inner blade 40 and the outer blade 14 are biased upward. The The flange 14c of the outer cutter 14 urges the outer cutter ring 76 and the swing case 48 upward. Since the hook 62 of the swing case 48 is engaged with the lower surface of the spherical plate portion 60 of the case cradle 50, the hook 62 restricts the blade unit 16 from protruding upward and maintains the position shown in FIG. Is done.

  Since the case cradle 50 is locked to the claw 52b of the knob 56, the case cradle 50 does not move upward. The coil spring 54 that pushes the knob 56 downward (the coil spring 54 loaded on the triangular column 18a) has a sufficiently large spring constant as compared with the coil spring 36 of the drive shaft 26. The inner blade 40 is rotated by the rotation of the drive shaft 26, and the wrinkles that have entered the slit 22 of the outer blade 14 are cut by the inner blade 40.

  When a vertical downward external force in FIG. 4 is applied to the center or the entire surface of the outer cutter 14, the outer cutter 14 descends within a certain range with respect to the outer cutter ring 76 while compressing the drive shaft 26. That is, the lowering amount of the outer cutter 14 is limited to the range of the width in the vertical direction of the groove on the outer cutter ring 76 side where the flange 14C of the outer cutter 14 is engaged.

  When a downward external force is applied to a part of the outer periphery of the outer blade 14 (a position displaced from the center), the outer blade 14 is tilted, and at this time, the swing case 48 swings together with the outer blade ring 76. That is, the lower surface of the swing case 48 slides on the case support portion 58 of the case cradle 50. At this time, the outer cutter 14 oscillates while compressing the conical coil spring 70 in the radial direction about the fulcrum P near the center of the upper surface of the outer cutter 14 (FIG. 9). For this reason, the outer blade 14 can follow the unevenness of the skin faithfully and can be tilted to obtain a wonderful shaving taste.

  Thus, when the outer cutter 14 and the swing case 48 are inclined, the upper joint 34 of the drive shaft 26 is inclined in the opposite direction as shown in FIG. In this state, the rotation of the drive shaft 26 is transmitted to the inner blade 40, and the small blades 40a, 40b of the inner blade 40 rotate while being in sliding contact with the inner surfaces (lower surfaces) of the tracks 14a, 14b of the outer blade 14, thereby cutting the ridges. .

  When the external force applied to the outer blade 14 is lost, the swing case 48 is pushed back in the return direction by the conical coil spring 70. At this time, the drive shaft 26 also returns to the vertical position in FIG. As a result, the state returns to the state of FIG.

1 is an external perspective view of an embodiment of the present invention. Enlarged perspective view of the blade head Similarly exploded perspective view Side sectional view of one blade unit An exploded perspective view showing one blade unit excluding the outer blade and the inner blade Two exploded side sectional views (A) and (B), also cut from different directions Top view showing the combined state of the swing case and case holder A side sectional view showing the same part Side sectional view showing a state in which the outer blade and the swing case are inclined.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main body part 12 Head part 14 Outer blade 16 Blade unit 18 Outer blade frame 26 Drive shaft 40 Inner blade 48 Oscillating case 50 Case support 58 Case support part 60 Spherical plate part 62 Tongue hook 68 Cylindrical part 70 Conical coil spring ( Return spring)
72 Hook with a hook-like tip 76 Outer ring P P Swing center of blade unit

Claims (7)

A substantially disc-shaped outer cutter is held up and down by an outer cutter frame mounted on the upper part of the main body containing the motor, and the inner cutter loaded from the lower side inside the outer cutter is rotated by the motor. In a rotary electric razor equipped with a blade unit that rotates while being elastically pressed toward the outer blade by a drive shaft.
The blade unit includes a case base having a case support portion that is held on the main body portion coaxially with the drive shaft and located on a hemispherical surface that opens from below the outer blade and upward within the diameter of the outer blade. ,
The case holder is held by the case holder so that it can slide in any direction by sliding contact with the case support portion of the case holder and surrounds the lower portion of the outer blade and the inner blade, and prevents the inner blade from falling upward. A substantially bowl-shaped swing case,
An outer ring which is detachably fixed to the upper edge of the swing case and engages with the outer peripheral edge of the outer blade to hold the outer blade in a predetermined range so as to be movable up and down;
A return spring that returns the swing case to a position coaxial with the case cradle;
The rotary electric shaver is characterized in that it can be swung in an arbitrary direction together with the outer blade by sliding the swinging case on a case support portion of the case cradle.   The rotary electric shaver according to claim 1, wherein the center of the hemispheric surface where the case support portion of the case cradle is located is located near the center of the surface of the outer blade. The case cradle has a spherical plate portion extending in the inner diameter direction substantially along a hemispherical surface that opens upward within the diameter of the outer blade, and the swinging case has a tongue that engages with the lower surface of the spherical plate portion from the inner diameter side. The rotary electric shaver according to claim 1 or 2, wherein a hook-like hook is formed.   4. The swing case has a cylindrical portion that protrudes downward through the inner diameter side of the spherical plate portion of the case pedestal, and the return spring is a conical coil spring loaded between the cylindrical portion and the case pedestal. Rotary electric razor.   The swinging case is provided with a plurality of hooks protruding upward from the inner diameter side and bent at the inner end side in a hook shape, and these hooks are bosses of the inner blade when the outer cutter ring is removed from the swinging case. The rotary electric shaver according to any one of claims 1 to 4, wherein the rotary blade prevents the inner blade from falling off the swinging case by being engaged with the blade.   The rotary electric shaver according to any one of claims 1 to 5, wherein a plurality of blade units are held on the outer blade frame, and the outer blades of each blade unit are independently movable up and down and swingable in an arbitrary direction.   The rotary electric shaver according to claim 6, wherein a plurality of case bases corresponding to the plurality of outer blades are integrally formed.

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