JP5229803B2 - Electric razor - Google Patents

Description

  The present invention relates to an electric razor including a floating support structure that supports a razor head in a tiltable manner and in a vertically floatable manner.

  Such a floating support structure can be found, for example, in US Pat. There, four support legs are guided and supported by the main body so as to be slidable up and down, and a razor head is supported by a ball seat provided at the upper end of each support leg. A float spring that pushes up and biases the razor head is disposed around each support leg. The razor head includes a motor and a vibrator, an outer blade holder that can swing back and forth, and the like, and can float up and down with respect to the main body by a pressing reaction force received from the skin surface, and can tilt further to the left and right.

  The floating support structure in Patent Document 2 includes a U-shaped frame-shaped support base fixed to the main body, a pair of left and right links connecting the support base and the razor head, and a return spring that urges the razor head to return to the neutral position. And a float table that is pushed up and biased by a float spring. The support table is fixed to the upper surface of the float table. The pair of left and right links are arranged in a C shape, the lower ends of the links are connected to the front and rear surfaces of the razor head, and the upper ends of the links are individually connected to the pair of left and right connection holes provided in the support base. It is.

  As described above, the razor head supported by a pair of left and right links in the shape of a letter can float up and down with respect to the main body by the pressing reaction force received from the skin surface, and the left and right links are independent of the support base. Can be tilted left and right. The center of tilting when the razor head is in the neutral position is on the center axis of the main body and on the intersection of the center lines of the left and right links. However, the instantaneous tilt center when the razor head tilts to the left or right is on the intersection of the link center line shifted to the left or right from the center axis of the main body, but the amount of shift is negligible. The instantaneous tilt center position is substantially constant.

  In the floating support structure of the present invention, a partial arc-shaped tilt groove is formed in the tilt frame, and the tilt groove is moved and guided by a plurality of rollers to tilt the razor head left and right. Is disclosed in Patent Document 3. There, a motor, a vibrator, and the like are incorporated in the tilting frame, and the concave arc-shaped tilting grooves formed on the front and rear surfaces of the tilting frame are transferred and guided by three rollers disposed on the front and rear surfaces of the main body case. The virtual tilt center when the razor head tilts left and right is located in the vicinity of the top center of the blade surface. Although the entire razor head can be tilted in the front-rear direction, it cannot float up and down because the tilting groove of the tilting frame is received by a roller.

Japanese Patent Laid-Open No. 10-043443 (paragraph number 0027, FIG. 3) Japanese Patent Laying-Open No. 2005-192615 (paragraph number 0051, FIG. 7) Japanese Patent Laid-Open No. 06-343776 (paragraph number 0016, FIG. 1)

  The floating support structure of Patent Document 1 supports the razor head so that it can tilt left and right with four support legs that slide up and down and a float spring, so that the razor head can be tilted left and right following changes in the skin surface. Can float. However, since the four lower surfaces of the razor head are supported by the support legs, the razor head is liable to tilt in the front-rear direction when tilting left and right, so that the razor head is likely to fluctuate during shaving and it is difficult to shave in a stable state.

  In that respect, the floating support structure of Patent Document 2 supports the razor head so that it can tilt left and right with four links arranged in a C-shape, so that the razor head does not tilt back and forth, and in a more stable state. You can shave. However, the instantaneous tilt center position when the razor head tilts left and right is substantially constant. Further, even if the sinking amount when the razor head sinks toward the main body portion changes to a large or small amount, the vertical distance between the previous tilting center and the blade surface of the razor head is constant and does not change.

  An object of the present invention is to provide an electric razor capable of smoothly cutting a beard by actively changing the tilting locus of the razor head in accordance with the amount of the razor head pushed into the main body case. The object of the present invention is to make the beard cutting smoothly by following the change in the skin surface of the razor head, and to make the beard cutting lighter by always performing the horizontal tilting operation in a stable state. It is to provide an electric razor that can be used.

  The electric razor according to the present invention is provided with a left-right tilt mechanism that supports the razor head 3 so as to be tiltable left and right between the main body case 2 and the razor head 3. As shown in FIG. 1, the left / right tilt mechanism is configured such that the razor head 3 can tilt left / right around the virtual tilt center P. The razor head 3 is guided and supported by a float structure provided between the left-right tilt mechanism and the razor head 3 so as to be movable up and down, and is pushed up and biased by a float spring 80. Thus, the vertical distance H between the virtual tilt center P and the blade surface S of the razor head 3 varies depending on the pushing amount of the razor head 3 pushed into the main body case 2 side. Razor.

  The left / right tilt mechanism includes a bracket 51 fixed to the main body case 2 side, a head holder 52 supported by the bracket 51 so as to be tiltable left / right, and a first return spring 53 for returning the head holder 52 to a neutral position. The razor head 3 is guided and supported by the head holder 52 so as to be movable up and down.

  The virtual tilt center P of the left / right tilt mechanism is positioned in the vicinity of the top center Q of the razor head 3.

  As shown in FIG. 4, the razor head 3 is provided with an outer blade 15, an outer blade support structure 13 that supports the outer blade 15, an inner blade 16, and an inner blade spring 28 that pushes up and biases the inner blade 16. . The outer blade 15 is supported by the outer blade support structure 13 so as to be movable up and down and tilted left and right.

  The outer blade support structure 13 includes a tilt frame 31 that supports the outer blade 15 and an outer blade holder 32 that supports the tilt frame 31. The tilt frame 31 is supported by a pair of left and right side walls 43 provided on the outer blade holder 32 so as to be tiltable back and forth via a shaft 36. A second return spring 37 is provided between the tilt frame 31 and the outer blade holder 32 to urge the tilt frame 31 back to the neutral position.

  As shown in FIG. 3, a pair of front and rear outer blades 15 and an inner blade 16 that is driven to reciprocate along each outer blade 15 are assembled to the razor head 3. Thus, the inner blade drive structure that reciprocally drives both the inner blades 16 is configured such that the front inner blade 16 and the rear inner blade 16 can be driven in opposite directions.

  The left / right tilting mechanism is supported by a partially concave arc-shaped tilting groove 70 formed on at least one of the front and rear surfaces of the head holder 52 and a bracket 51 so as to be freely swingable, and a plurality of the tilting mechanisms 70 are moved and guided. A single guide roller 59 is included (see FIG. 1).

  Two guide rollers 59 and an auxiliary roller 61 are provided on the bracket 51. A partial arcuate tilting body 71 is provided adjacent to the tilting groove 70 of the head holder 52 and guided by the auxiliary roller 61.

  A first return spring 53 is provided between the bracket 51 and the head holder 52 to return the head holder 52 tilted left and right to the neutral position (see FIG. 8).

  When the spring force of the inner blade spring 28 is F1, the spring force of the float spring 80 is F2, the spring force of the second return spring 37 is F3, and the spring force of the first return spring 53 is F4, the spring force of each spring is It sets so that the relationship of F1> F2> F3> F4 may be satisfied.

  The electric razor of the present invention has a float structure in which the razor head 3 is supported by a left-right tilt mechanism so that it can tilt left and right around one virtual tilt center P, and is further provided between the left-right tilt mechanism and the razor head 3. It was guided and supported so that it could move up and down, and was pushed up and biased by a float spring 80. As a result, the vertical distance H between the virtual tilt center P and the blade surface of the razor head 3 is changed to be larger or smaller in accordance with the push amount of the razor head 3 pushed into the main body case 2 side.

  As described above, according to the electric razor that changes the vertical distance H between the virtual tilt center P and the blade surface S of the razor head 3 in accordance with the amount of pressing of the razor head 3, the tilting posture of the razor head 3 is changed. Various changes can be made within the range of the vertical distance H. For example, when the virtual tilt center P is provided at the top center Q of the blade surface S as shown in FIG. 13A, the razor head 3 can be tilted left and right around the virtual tilt center P. Further, FIG. In the state where the blade surface S sinks from the virtual tilt center P by the vertical distance H as shown in (b), the razor head 3 can be tilted in various directions around the virtual tilt center P at an arbitrary sink position. . Note that the position of the virtual tilt center P is always constant even when the razor head 3 tilts left or right or floats up and down, and the position does not change.

  Therefore, according to the electric razor of the present invention, when the blade surface S of the razor head 3 is lightly applied to the skin surface, the razor head 3 is tilted left and right around the virtual tilt center P following the change of the skin surface. The beard cutting can be performed smoothly. Further, when the blade surface S sinks below the virtual tilt center P, the top center Q of the blade surface S is tilted and displaced along the radial line R centering on the virtual tilt center P, and the blade at this time The surface S tilts while sliding relative to the skin surface. Therefore, the movement of the razor head 3 is restrained by the frictional resistance when the blade surface S slides relative to the skin surface, and the razor head 3 does not wobble and changes in the skin surface in a stable state. In accordance with the displacement, the whisker can be cut more easily. Further, since the tilting moment changes depending on the amount of subsidence of the blade surface S, the razor head 3 is easy to move when the vertical distance H is small, but when the vertical distance H is large. The movement is suppressed, and the user can press the blade surface S against the skin surface with a desired pressing force to tilt left and right.

  The bracket 51, the head holder 52 supported by the bracket 51 so as to be able to tilt left and right, and the first return spring 53 and the like constitute a left-right tilt mechanism, and the floating support structure that guides and supports the razor head 3 so that the head holder 52 can move up and down. According to the above, while the head holder 52 and the razor head 3 are tilted left and right, the razor head 3 can be floated up and down at the same time. Further, since the head holder 52 is supported by the bracket 51 so as to be able to tilt left and right, and the razor head 3 is guided and supported by the head holder 52 so as to be able to move up and down, the left and right tilting operation and the vertical movement operation can be performed independently and smoothly. Therefore, the razor head 3 can be floated up and down while tilting left and right following the change in the skin surface to maintain the razor head 3 in an optimal posture, and the beard can be cut lightly.

  When the virtual tilt center P of the left / right tilt mechanism is positioned in the vicinity of the top center Q of the razor head 3, the virtual tilt center P when the razor head 3 is pressed against the skin surface is positioned above the outer surface of the blade surface S. Can be positioned. Thus, the blade surface S in a state where the virtual tilt center P is located above the outer surface of the blade surface S is tilted and displaced along the radial line R centering on the virtual tilt center P and is pressed against the skin surface. The side blade surface S tilts in a state where it is inclined downward. When the entire razor head 3 is slid upward in this state, whiskers can be cut while the blade surface S is properly brought into close contact with the skin surface while maintaining the previously tilted posture. Therefore, as compared with the case where the virtual tilt center P is provided on the main body case 2 side with respect to the blade surface S, whiskers can be cut lightly while the blade surface S is tilted and displaced according to the skin surface change in a more stable state.

  The razor head 3 is provided with an outer blade 15, an outer blade support structure 13, an inner blade 16, and an inner blade spring 28 that pushes and urges the inner blade 16, and the outer blade 15 can be moved up and down and tilted left and right by the outer blade support structure 13. , The outer blade 15 having a small mass is moved up and down or tilted left and right in advance of other members such as the razor head 3, and the posture of the blade surface S is gradually changed corresponding to the change in the skin surface. Moreover, it can be followed lightly.

  The outer blade support structure 13 is configured by the tilt frame 31 and the outer blade holder 32, and the tilt frame 31 is supported by the outer blade holder 32 so as to be tiltable forward and backward via the shaft 36, and is moved to the neutral position by the second return spring 37. When the return bias is applied, the outer blade 15 can be further tilted back and forth while allowing the outer blade 15 to move up and down and to the left and right according to changes in the skin surface as described above. Therefore, the blade surface S is always brought into close contact with the skin surface in an appropriate posture, and the beard cutting can be performed effectively.

  When the razor head 3 is provided with a pair of front and rear outer blades 15 and a pair of front and rear inner blades 16 that are driven to reciprocate, when the inner blades 16 are driven in opposite directions by the inner blade driving structure, each inner blade The motion inertia force of 16 can be canceled out, for example, compared with the case where both the inner blades 16 are simultaneously driven in the same direction, the generation of vibration can be remarkably suppressed and the electric razor can be silenced, and the feeling of use can be improved. . Further, it is possible to well prevent the outer blade 15 from being lifted away from the skin surface due to reciprocal vibration.

  When a left and right tilt mechanism is configured by a partially concave arc-shaped tilt groove 70 formed on at least one of the front and rear surfaces of the head holder 52 and a plurality of guide rollers 59 provided on the bracket 51 side, a plurality of guides are provided. The roller 59 can reliably guide the tilting groove 70 in a stable state. That is, the left / right tilt mechanism can be configured as a positive mechanism, and the head holder 52 can be accurately tilted and displaced according to the movement locus defined by the guide roller 59.

  When two guide rollers 59 and an auxiliary roller 61 are provided on the bracket 51 and the tilt groove 70 and the tilt body 71 are moved and guided by these rollers 59 and 61, the head holder 52 is further moved by the three rollers 59 and 61. It can be supported so that it can tilt to the left and right in a stable state. Further, the external force when the razor head 3 is pushed against the float spring 80 can be dispersedly supported by the three rollers 59 and 61 so that the head holder 52 can be tilted left and right lightly and smoothly. .

  If the first return spring 53 for returning the head holder 52 tilted left and right to the neutral position is provided between the bracket 51 and the head holder 52 that slide relative to each other, the spring force of the first return spring 53 is maintained without delay. Thus, the head holder 52 and the razor head 3 can be smoothly returned to the neutral position. Further, it is possible to prevent the first return spring 53 from being unnecessarily large and to make the floating support structure compact.

  When the spring force of the inner blade spring 28 is F1, the spring force of the float spring 80 is F2, the spring force of the second return spring 37 is F3, and the spring force of the first return spring 53 is F4, the spring force of each spring is When setting is made so as to satisfy the relationship of F1> F2> F3> F4, in the razor head 3 having various degrees of freedom, the movement of the outer blade 15 and the razor head 3 can be suppressed and shaving can be performed in a stable state. Specifically, the outer blade 15 can be moved up and down and tilted left and right prior to the others, and then the razor head 3 can be moved into the main body case 2 by sinking. Further, the razor head 3 can be tilted and displaced to the left and right after allowing the outer blade 15 and the inner blade 16 to tilt forward and backward. The spring force of each spring is such that when the outer blade 15 starts to move up and down and to the left and right, when the razor head 3 starts to sink, and when the outer blade 15 and the inner blade 16 start to tilt back and forth, This is the spring force when the head 3 starts to tilt left and right.

(Embodiment) FIGS. 1 to 13 show an embodiment of an electric shaver according to the present invention. In FIG. 2, the electric razor is composed of a main body case 2 that also serves as a grip, an electrical component housed in the main body case 2, a razor head 3 disposed on the upper portion of the main body case 2, and the like. The electrical component includes a secondary battery 4, a circuit board on which a control circuit is mounted, an inner case 5 that accommodates both, a switch structure, and the like. The inner case 5 is fixed to the main body case 2. On the front surface of the main body case 2, a switch knob 6 for starting the motor and a display window 7 for lighting and displaying the operation status of the electric razor and the charging status of the secondary battery 4 are provided. In the present invention, “front / rear”, “left / right”, and “upper / lower” refer to the orthogonal arrows shown in FIG. 2 and FIG.

  The razor head 3 includes a head case 11, a motor holder 12 fixed to the lower surface of the head case 11, an outer blade support structure 13 assembled on the upper surface of the head case 11, and the like as main outer structures. . At the upper end of the razor head 3, a pair of front and rear outer blades 15 made of mesh blades and a pair of inner blades 16 made of slit blades reciprocally driven along the inner surface of the outer blade 15 are arranged. The outer cutter 15 is fixed to an outer cutter frame 17 whose upper and lower surfaces are open and is formed into a cassette. Similarly, the inner blade 16 is fixed to an inner blade frame 18 whose upper and lower surfaces are open and is formed into a cassette. As shown in FIG. 4, slide grooves 19 that are long in the vertical direction are formed on the left and right side walls of the outer cutter frame 17. A passive piece 20 for connecting a drive shaft 24 to be described later is integrally provided at the left and right center inside the inner blade frame 18.

  Inside the razor head 3, an inner blade driving structure for reciprocally driving both inner blades 16 is incorporated. As shown in FIG. 3, the inner blade drive structure has a motor 22 incorporated in the motor holder 12, a pair of front and rear vibrators 23 incorporated in the head case 11, and the reciprocating power of the vibrator 23 to the inner blade 16. It comprises a pair of front and rear drive shafts 24 that transmit to the front.

  An eccentric cam 25 is fixed to the output shaft of the motor 22, and eccentric pins 26 for reciprocating the vibrator 23 are provided above and below the eccentric cam 25. In order to drive the front inner blade 16 and the rear inner blade 16 in opposite directions, the phase positions of the upper and lower eccentric pins 26 are shifted by 180 degrees. The drive shaft 24 includes a T-shaped fixed drive shaft 24a connected to the vibrator 23 and a movable drive shaft 24b that can be tilted back and forth with respect to the fixed drive shaft 24a. A connecting frame 27 that engages with the passive piece 20 is formed integrally with the upper portion of the movable drive shaft 24b. The inner blade 16 connected to the connection frame 27 is pushed up and biased by an inner blade spring 28 disposed between the passive piece 20 and the movable drive shaft 24b.

  As shown in FIG. 6, the head case 11 is composed of an upper head case 11a and a lower head case 11b, and attachment portions on both ends of the vibrator 23 are sandwiched between the joint surfaces of the both cases 11a and 11b. Fixed. The outer blade support structure 13 includes a tilting frame 31 that supports the outer blade frame 17, an outer blade holder 32 that supports the tilting frame 31, and a spring receiving frame 33 that is disposed between the both 31 and 32. . The tilt frame 31 is provided to support the outer blade 15 and the outer blade frame 17 so as to be movable up and down and to the left and right, and to allow the outer blade 15 and the outer blade frame 17 to tilt forward and backward.

  Specifically, by forming engagement protrusions 35 on the opposing surfaces of the pair of left and right side walls of the tilting frame 31, and slidingly guiding the slide grooves 19 of the outer blade frame 17 disposed between both side walls with the engagement protrusions 35, The outer blade 15 and the outer blade frame 17 are supported so as to be vertically movable and horizontally tiltable (see FIG. 4). Further, the upper portions of the left and right side walls of the tilting frame 31 are pivotally supported by the outer blade holder 32 via the shaft 36 so as to tilt forward and backward, and the outer blade 15 and the outer blade frame 17 can be tilted forward and backward by accompanying the tilting frame 31. I am doing so.

  A second return spring 37 is disposed between the tilt frame 31 and the outer blade holder 32, and the tilt frame 31 tilted back and forth by this spring 37 is returned to the neutral position. As shown in FIG. 5, the second return spring 37 is a partial arc-shaped wire spring, and the front and rear ends thereof are hooked in grooves 38 provided in the spring receiving frame 33 and the outer blade holder 32. The spring receiving frame 33 is provided with a pair of upper and lower spring holders 39 and 40 that sandwich and hold the middle part of the second return spring 37. When the spring receiving frame 33 accompanies the tilting frame 31 and tilts back and forth, the spring holders 39 and 40 elastically deform the spring 37 while sliding relative to the second return spring 37, and the one latching end is grooved. 38 is displaced. The tilting frame 31 and the outer blade frame 17 are returned to the neutral position by the elastic force at this time. In order to facilitate the tilting of the tilting frame 31 in the front-rear direction, a pair of front and rear tilting pins 42 are provided on the outer surfaces of the left and right side walls. I have been guiding the transition.

  The outer blade holder 32 is formed of a frame body having upper and lower surfaces having a pair of left and right side walls 43 and is detachably attached to the head case 11. The tilt frame 31 is disposed between the pair of side walls 43 and is supported by the shaft 36 so as to be tiltable back and forth as described above. As shown in FIG. 7, the outer blade holder 32 is locked and held so as not to be separated by a lock claw 45 incorporated in the head case 11. The lock release button 46 formed integrally with the lock claw 45 is pushed against the lock spring 47 to release the engagement between the lock claw 45 and the lock recess 48, so that the outer blade holder 32 is moved to the head case 11. Can be removed from.

  In order to support the entire razor head 3 so as to be able to tilt left and right, a left-right tilt mechanism is provided between the main body case 2 and the razor head 3. Further, a float structure is provided between the left-right tilt mechanism and the razor head 3, and the entire razor head 3 is supported so as to be able to float up and down.

  In FIG. 1, the left / right tilt mechanism includes a bracket 51 fastened and fixed to the upper end of the inner case 5, a head holder 52 supported by the bracket 51 so as to be tiltable left and right, and a first return for returning the head holder 52 to a neutral position. A spring 53 (see FIG. 8) is used. The bracket 51 is formed in a U-shaped frame shape by fastening lower ends of the front bracket 54 and the rear bracket 55 with screws 56. As shown in FIG. 9, a T-shaped roller arm 58 is provided on the upper portion of the front bracket 54, and a pair of left and right guide rollers 59 can be freely rotated by pins 60 on the rear surface side of both lateral arms of the roller arm 58. Pivot. Further, another auxiliary roller 61 is pivotally supported by a pin 62 on the front surface of the middle portion of the vertical arm of the roller arm 58 so as to be freely rotatable. A further auxiliary roller 63 is pivotally supported by a pin 64 on the upper front surface of the rear bracket 55 so as to be freely rotatable. The first return spring 53 is composed of a tension spring, and the upper and lower ends thereof are hooked on a pin 64 and a spring hooking protrusion 75 described later (see FIG. 8).

  The head holder 52 includes a front holder body 67 and a rear holder body 68 each formed in a casing shape. The front holder body 67 has a partially concave arc-shaped forward tilt groove (tilt groove) 70 which is guided to be transferred by the guide roller 59, and is further moved by the auxiliary roller 61 below the front tilt groove 70. A partially concave arc-shaped tilting frame 71 to be guided is provided. On the rear surface of the front holder body 67, a front guide surface 72 (see FIG. 11) for slidably guiding and supporting the motor holder 12 is formed in a groove shape.

  In the upper part of the rear holder body 68, a rear concave groove (tilt groove) 74 that is partially guided by the auxiliary roller 63 is formed, and the first return spring 53 is latched at the center of the lower end of the rear surface. For this purpose, a spring projection 75 is formed. A rear guide surface 76 that slidably guides and supports the motor holder 12 is formed on the front surface of the rear holder body 68 so as to be recessed in a groove shape. As shown in FIG. 11, the front and rear holder bodies 67 and 68 are joined in a state of holding the motor holder 12 from the front and rear, fastened with screws 77, and further fastened with a pair of left and right sandwiching springs 78 having a U-shaped cross section. (See FIG. 12).

  As described above, by supporting the motor holder 12 with the head holder 52 and supporting the head holder 52 with the bracket 51, the entire razor head 3 can be supported so as to be tiltable in the left-right direction. The virtual tilt center P when the razor head 3 tilts left and right is determined by the curvature of the front tilt groove 70, the tilt frame 71, and the rear tilt groove 74. In this embodiment, as shown in FIG. The previous curvature was set so as to be located at the center Q of the top of the razor head 3. In a state where the head holder 52 is supported by the bracket 51, the upper groove circumferential surface of the front tilt groove 70 is supported by the left and right guide rollers 59, and the upper surface of the tilt frame 71 is supported by the auxiliary roller 61. Therefore, when the head holder 52 tilts left and right or the razor head 3 floats up and down, the head holder 52 does not rattle up and down, and the left and right tilting operation and the vertical floating operation can be performed smoothly.

  The float structure is configured using the head holder 52. Specifically, the front guide surface 72 and the rear guide surface 76 provided on the front and rear holder bodies 67 and 68, the motor holder 12 slidably guided by the both guide surfaces 72 and 76, and the float spring 80 constitute a float structure. . The float spring 80 is composed of a compression spring, and is disposed between the lower end of the motor holder 12 and the base end of the bracket 51 to push up and bias the entire razor head 3. In order to define the push-up limit by the float spring 80, stoppers 81 are formed on the left and right side surfaces of the lower part of the motor holder 12, respectively. As shown in FIG. 10, the state where the stopper 81 is in contact with the lower edge of the head holder 52 is the push-up limit.

  According to the electric shaver configured as described above, the outer blade 15 and the inner blade 16 can move up and down and left and right with respect to the tilt frame 31, and the tilt frame 31 can tilt back and forth with respect to the outer blade holder 32. Further, the entire razor head 3 can float up and down with respect to the main body case 2 and can tilt left and right. As described above, when the degrees of freedom of the razor head 3 are varied, the razor head 3 is likely to wobble. Therefore, the degree of freedom is given to the degree of freedom to suppress the movement of the outer blade 15 and the razor head 3 so that the shaving can be performed in a stable state. Specifically, when the spring force of the inner blade spring 28 is F1, the spring force of the float spring 80 is F2, the spring force of the second return spring 37 is F3, and the spring force of the first return spring 53 is F4, The spring force of the spring is set so as to satisfy the relationship of F1> F2> F3> F4.

  When the razor head 3 is not in use, the razor head 3 is pushed up and biased by the float spring 80, and as shown in FIG. 2, there is a sufficient gap between the lower peripheral surface of the head case 11 and the upper end of the main body case 1. ing. When the razor head 3 in this state is pushed into the main body case 2 while the blade surface (outer surface of the outer blade 15) S is held horizontally, the float spring 80 is compressed and deformed, and eventually the periphery of the head case 11 The lower surface is received by the upper end of the main body case 1. The pushing operation force at this time coincides with the repulsive force of the float spring 80.

  The virtual tilting center P when the razor head 3 is in the neutral position in an unloaded state where no external force that tilts the blade surface S is applied to the razor head 3 is located at the top center Q of the blade surface S. From this state, when an external force is applied to a position away from the top center Q of the blade surface S of the razor head 3 to the left side, as shown in FIG. 13A, the entire razor head 3 depends on the magnitude of the external force f1. To the left about the virtual tilt center P. Therefore, in a state where the blade surface S of the razor head 3 is lightly applied to the skin surface, the whisker can be cut smoothly following the change in the skin surface. If the repulsive force of the first return spring 53 in this state is smaller than the spring force F2 of the float spring 80, the razor head 3 will not sink into the main body case 2 side. However, when the previous repulsive force exceeds the spring force F2 of the float spring 80, the razor head 3 sinks to the main body case 2 side by an excess amount.

  FIG. 13B shows a state in which the razor head 3 is pushed to the limit position on the main body case 2 side by the external force f2 and further tilted to the left tilt limit position. In this state, like the conventional electric razor, the repulsive force of the float spring 80 and the repulsive force of the first return spring 53 act on the blade surface S. However, the blade surface S sinks from the virtual tilt center P by the amount that the razor head 3 is pushed into the main body case 2 side, that is, the vertical distance H. Therefore, the top center Q of the blade surface S is tilted and displaced along the radial line R centered on the virtual tilt center P. As a result, the top center Q of the blade surface S is relatively slid relative to the skin surface. Tilt while moving. In other words, the razor head 3 does not fluctuate as much as the blade surface S slides relative to the skin surface, and can be tilted and displaced in a stable state. This effect can be exhibited when the vertical distance H is greater than zero, and becomes more prominent as the vertical distance H increases.

  As described above, when the vertical distance H is greater than zero, if the top center Q of the blade surface S is tilted while sliding relative to the skin surface, the razor head 3 is pushed into the body case 2 side. Can be prevented from wobbling in the left-right direction. Furthermore, since the distance moved along the radial line R varies depending on whether the amount of pushing of the razor head 3 is small or large, the user can lighten the user while applying the desired pressing force to the skin surface. A beard cutting can be performed. In addition, since the tilting moment changes depending on the amount of sinking of the blade surface S, the razor head 3 is relatively easy to move when the vertical distance H is small, but when the vertical distance H is large. In this state, the movement is suppressed, and the user can press the blade surface S against the skin surface with a desired pressing force and tilt it left and right.

  Incidentally, when the blade surface S is pushed into the main body case 2 side and becomes horizontal, and the top center Q is in contact with the lower end of the lower jaw, the entire electric razor is shown in FIG. , The pushing force that had been acting on the top center Q until now acts on the blade surface S on the left half side, so that the entire razor head 3 is shown in FIG. Will tilt to the left. Conversely, when the entire electric razor is moved to the upper right side in FIG. 13, the entire razor head 3 tilts downward with respect to the main body case 2.

  FIG. 14 shows another embodiment of the guide structure of the auxiliary roller 61. There, a partial concave arc-shaped front tilt groove 70 guided by the guide roller 59 is formed in the front upper portion of the front holder body 67, and a portion guided by the auxiliary roller 61 below the front tilt groove 70. A concave arc-shaped tilting groove 71 is provided. The tilt groove 71 corresponds to the tilt frame in the previous embodiment. Thus, the guidance object of the auxiliary roller 61 may be a frame or a groove. Since others are the same as the previous embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.

  15 and 16 show another embodiment of the electric shaver according to the present invention. There, a left and right tilt mechanism is constituted by a bracket 51 fixed to the inner case 5, a head holder 52 supported by the bracket 51 via a pair of left and right tilt arms 85 so as to be tiltable left and right, a first return spring 53, and the like. To do. The upper end of the tilting arm 85 is connected to both ends of the upper end of the bracket 51 via a connecting pin 86 so as to be able to swing relative to each other, and the lower end of the tilting arm 65 is the protruding end of the arm bracket 87 protruding to the left and right of the head holder 52. Are connected to each other via a connecting pin 88. The first return spring 53 is hooked between the bracket 51 and the head holder 52 as in the previous embodiment.

  The virtual tilting center P when the razor head 3 is in the neutral position in the no-load state in which the external force for tilting the blade surface S is not applied to the razor head 3 is the center of the blade surface S on the central axis of the body case 2. It is located in the middle of the razor head 3 below the top center Q, and is the intersection of the central axes of the left and right tilt arms 87. When the razor head 3 is pushed in this state, the razor head 3 sinks toward the main body case 2 against the float spring 80, as shown by an imaginary line in FIG.

  Further, when the blade surface S is pressed against the skin surface and the razor head 3 is tilted to the left or right limit position by the reaction force, the blade surface S on the side subjected to the reaction force as shown in FIG. Tilts in a state of falling down. At this time, the virtual tilt center P1 is on the intersection of the central axes of the left and right tilt arms 87, and is displaced to a position shifted to the left from the virtual tilt center P in the neutral state toward FIG. As indicated by the imaginary line, the virtual tilt center P1 when the razor head 3 tilts in the opposite direction is similarly displaced from the virtual tilt center P in the neutral state to a position shifted to the right side in FIG.

  As described above, the position of the virtual tilt center P in this embodiment continuously changes according to the change in tilt angle when the razor head 3 tilts to the left and right. . The present invention also includes a left-right tilt structure in which the instantaneous virtual tilt center P changes continuously as described above.

  In addition to the above embodiment, the virtual tilt center P when the razor head 3 tilts left and right does not need to be positioned at the top center Q of the razor head 3, but from the top center Q as described with reference to FIGS. In addition to being provided at a position distant from the main body case 2 side, it can be provided at a position distant from the top center Q. The present invention can also be applied to an electric razor having a rotary inner blade 16. The bracket 51 may be directly attached to the main body case 2.

It is a partially broken front view which shows a floating support structure. It is a front view of an electric razor. It is the sectional view on the AA line in FIG. It is a partially broken front view of the razor head which shows the drive structure of an inner blade. It is the BB sectional view taken on the line in FIG. It is an exploded sectional view of a razor head. It is a partially broken front view of a razor head. It is CC sectional view taken on the line in FIG. It is a disassembled front view of a floating support structure. It is a vertical front view of a floating support structure. It is the DD sectional view taken on the line in FIG. It is the EE sectional view taken on the line in FIG. It is operation | movement explanatory drawing which shows the left-right tilting operation | movement of a floating support structure. It is a front view which shows another Example of the left-right tilt structure. It is a front view which shows another Example of the left-right tilt structure. It is a front view which shows the tilting operation | movement of the left-right tilting structure which concerns on FIG.

Explanation of symbols

2 Main body case 3 Razor head 51 Bracket 52 Head holder 53 First return spring 59 Guide roller 70 Tilt groove (front tilt groove)
P Virtual tilt center Q Top center S Blade surface

Claims (10)

Between the main body case (2) and the razor head (3), a left / right tilt mechanism for supporting the razor head (3) so as to be tiltable to the left and right is provided.
The left-right tilt mechanism is configured such that the razor head (3) can tilt left and right around the virtual tilt center (P),
The razor head (3) is supported by a float structure provided between the left-right tilt mechanism and the razor head (3) so as to be movable up and down, and is pushed up and biased by a float spring (80).
The vertical distance (H) between the virtual tilt center (P) and the blade surface (S) of the razor head (3) is large or small in accordance with the amount of pushing of the razor head (3) pushed into the main body case (2). An electric razor characterized by changing to. The left / right tilt mechanism returns the bracket (51) fixed to the main body case (2) side, the head holder (52) supported by the bracket (51) so as to be tiltable left and right, and the head holder (52) to the neutral position. A first return spring (53) to be operated;
2. The electric razor according to claim 1, wherein the razor head (3) is supported by a head holder (52) so as to be movable up and down.   The electric shaver according to claim 1 or 2, wherein the virtual tilting center (P) of the left-right tilting mechanism is located in the vicinity of the top center (Q) of the razor head (3). The razor head (3) has an outer blade (15), an outer blade support structure (13) that supports the outer blade (15), an inner blade (16), and an inner blade that pushes and urges the inner blade (16). A spring (28) is provided,
The electric shaver according to any one of claims 1 to 3, wherein the outer blade (15) is supported by the outer blade support structure (13) so as to be vertically movable and horizontally tiltable. The outer blade support structure (13) includes a tilt frame (31) that supports the outer blade (15) and an outer blade holder (32) that supports the tilt frame (31).
The tilt frame (31) is supported by a pair of left and right side walls (43) provided on the outer blade holder (32) so as to be tiltable back and forth via the shaft (36).
The electric shaver according to claim 4, wherein a second return spring (37) is provided between the tilt frame (31) and the outer blade holder (32) to return and bias the tilt frame (31) to the neutral position. A pair of front and rear outer cutters (15) and an inner cutter (16) driven reciprocally along each outer cutter (15) are assembled to the razor head (3).
The inner blade driving structure for reciprocally driving both inner blades (16) is configured to be able to drive the front inner blade (16) and the rear inner blade (16) in opposite directions. 5. The electric razor according to 5.   The tilting mechanism is pivotally supported by a tilting groove (70) formed in at least one of the front and rear surfaces of the head holder (52) and a partially concave arc-shaped tilting groove (70) and a bracket (51). The electric shaver according to any one of claims 2 to 6, comprising a plurality of guide rollers (59) for guiding the transition (70). The bracket (51) is provided with two guide rollers (59) and an auxiliary roller (61),
The electric shaver according to claim 7, wherein a partial arcuate tilting frame (71) that is guided by the auxiliary roller (61) is provided adjacent to the tilting groove (70) of the head holder (52).   The electric return according to claim 7 or 8, wherein a first return spring (53) is provided between the bracket (51) and the head holder (52) to return the head holder (52) tilted left and right to a neutral position. Razor.   The spring force of the inner blade spring (28) is (F1), the spring force of the float spring (80) is (F2), the spring force of the second return spring (37) is (F3), and the first return spring (53) The electric shaver according to claim 7, 8 or 9, wherein the spring force of each spring is set so as to satisfy a relationship of F1> F2> F3> F4 when the spring force is (F4).

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