JP2015070927A - Rotary type electric razor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a structure for retaining an outer blade with a few number of components, in which movable portions and spaces can be reduced and further an upper shape of a blade frame can be varied between a protruding surface and a recessed surface.SOLUTION: A rotary type electric razor 1 is equipped with a blade frame body 30 having a plurality of blade units 16 having an outer blade 22 and an inner blade 42 arranged. The blade frame body 30 has a plurality of outer blade frames 32 to be mounted individually with each outer blade 22 and has a connection portion 34 where adjacent outer blade frames 32 are connected to each other. The adjacent outer blade frames 32 are connected to each other with a play to be bendable at a connection position X and retained in a head case 12 so that an upper face 30a of the blade frame body 30 is protruded. When at least one of the outer blade frames 32 is pushed down, all of the connected outer blade frames 32 move together so that the upper face 30a of the blade frame body 30 can be deformed to be recessed.

Description

  The present invention relates to a rotary electric shaver.

  For example, as described in Patent Document 1, a blade having an outer blade having an annular shaving surface on the upper surface and an inner blade rotating in sliding contact with the lower surface of the outer blade on a head case held by the main body A rotary electric shaver having a plurality of units is known.

Japanese Patent No. 3964404

  Here, the rotary electric shaver exemplified in Patent Document 1 has a configuration in which a movable blade frame provided with each outer blade is provided in the outer blade frame. In the said structure, since there were many number of parts and the structure became complicated, there existed a subject that cost will rise. Furthermore, since there are many movable parts, there is a problem that dirt accumulates in a gap or the like in the movable part.

  The present invention has been made in view of the above circumstances, and by realizing the holding structure of the outer blade in the head portion with a small number of parts and simplifying the structure, it is possible to reduce costs and reduce movable parts. In addition, it is possible to prevent dirt from accumulating in the gap, and furthermore, by realizing a structure in which the shape of the upper surface of the blade frame body can be changed between a convex surface and a concave surface, the user can follow the skin. An object of the present invention is to provide a rotary electric razor that can be improved to improve shaving performance and shaving comfort.

  As an embodiment, the above-described problem is solved by a solution as disclosed below.

  The disclosed rotary electric shaver has a plurality of blade units each having an outer blade having an annular shaving surface on the upper surface and an inner blade rotating in sliding contact with the lower surface of the outer blade on the head case held by the main body. A rotary-type electric razor to which an arranged blade frame is mounted, wherein the blade frame has a plurality of outer blade frames to which the respective outer blades are individually mounted and the adjacent outer blade frames The head has a connecting portion to be connected to each other, the adjacent outer blade frames are connected with play so that they can be bent at the connecting position, and the upper surface of the blade frame body is convex. It is held in the case, and when at least one of the outer blade frames is pressed, all of the connected outer blade frames move together to be deformed so that the upper surface of the blade frame body becomes concave. It is a requirement that

  According to the disclosed rotary electric shaver, the outer blade holding structure in the head portion can be realized with a small number of parts. Therefore, the structure can be simplified and the cost can be reduced. In addition, since the gap can be reduced by reducing the movable parts, accumulation of dirt in the gap can be reduced. Furthermore, it is possible to realize a structure in which the shape of the upper surface of the blade frame can be changed between a convex surface and a concave surface. Thereby, the followability to the user's skin is improved, and the shaving performance and the shaving feeling can be improved.

It is the schematic which shows the example of the rotary electric shaver which concerns on embodiment of this invention. It is the schematic (exploded view) which shows the example of the head part of the rotary electric shaver shown in FIG. It is the schematic which shows the example of the blade frame body and inner blade holder of the rotary electric shaver shown in FIG. It is explanatory drawing for demonstrating the action | operation of the outer blade frame which comprises the blade frame body of the rotary electric shaver shown in FIG. It is the schematic which shows the example of the outer blade frame of the rotary electric shaver shown in FIG. It is explanatory drawing for demonstrating the action | operation of the blade frame body of the rotary electric shaver shown in FIG.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view (perspective view) showing an example of a rotary electric shaver 1 according to this embodiment. FIG. 2 is a schematic view (disassembled perspective view) showing an example of the head portion 3 of the rotary electric shaver 1. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof may be omitted.

  As shown in FIGS. 1 and 2, the rotary electric shaver 1 according to the present embodiment includes an outer blade 22 having an annular shaving surface formed with a number of scissors entrances on the upper surface 22 a, and a lower surface of the outer blade 22. The rotary electric shaver is configured to include an inner blade 42 having a small blade that rotates while being in sliding contact with the outer blade 22 and the inner blade 42 that cut the rod that has entered the retraction inlet. In addition, although the rotary electric shaver which has three sets of the blade units 16 comprised with the outer blade 22 and the inner blade 42 is mentioned as an example, it demonstrates, It is not limited to this.

  In FIG. 1, reference numeral 2 denotes a main body, which includes a substantially cylindrical case 10. The case 10 contains a battery, a motor, a control circuit board, and the like (all not shown). A power switch 14 is attached to the front surface of the case 10. In FIG. 1, reference symbol X denotes a connection position where adjacent outer blade frames 32 that are constituent elements of the blade frame body 30 are connected by a connecting portion 34 (details will be described later).

  In addition, a main drive shaft (not shown) that outputs a driving force for rotationally driving the inner blade 42 of the blade unit 16 is disposed so as to protrude from the upper surface of the case 10 toward the head portion 3 (described later).

  On the other hand, in FIGS. 1 and 2, reference numeral 3 denotes a head portion. As a characteristic configuration of the present embodiment, the head unit 3 is held by the main body unit 2 so as to be tiltable. Here, the detailed structure of the head part 3 is shown in the exploded perspective view of FIG. In addition, the holding | maintenance system to the main-body part 2 of the head part 3 is good also as a fixed type which cannot tilt.

  As shown in FIG. 2, the head unit 3 includes a head case 12 that is connected to and held by the upper part of the case 10 of the main body unit 2, a blade frame 30 that covers the head case 12 from above, and a head case. A drive mechanism comprising a gear (not shown), an inner blade drive shaft 60 and the like housed in the inner bottom portion of 12, and three sets of blade units 16 held by the blade frame 30 so as to be slightly movable up and down and swingable. And. Here, each blade unit 16 includes a substantially disk-shaped outer blade 22 and an inner blade 42 that rotates while sliding on the lower surface (inner surface) of the outer blade 22. Further, the three sets of blade units 16 are arranged in a triangular shape in plan view. Note that, as described above, this embodiment is an example in which three sets of blade units 16 are provided, but the basic configuration may be considered similarly in the case where the blade units are other than three sets.

  The inner blade drive shaft 60 that constitutes the drive mechanism is a member that is connected to the above-described main drive shaft via a gear or the like (not shown), and is a member that transmits the driving force of the motor and rotationally drives the inner blade 42. is there. The inner blade drive shaft 60 according to the present embodiment has a configuration in which a spherical portion is provided at the upper end and is held by the inner blade drive bearing 61, and a return behavior in the extension direction is generated by retracting a coil spring inside. It has become. This return behavior is a pressing force of the inner blade 42 to the outer blade 22 which will be described later.

  As shown in FIG. 2, the inner blade 42 according to the present embodiment includes a plurality of small blades 42 a in which a part of a metal plate is raised with respect to the plate surface. As an example, the inner blade 42 is formed by performing die cutting and bending by press working using a metal plate made of stainless steel. In addition, in this embodiment, although the inner blade 42 is made into the integral structure using a metal plate, it is not limited to this.

  Here, the inner blade 42 is fixed to a resin-made inner blade holding base 44, and a concave portion is formed in the lower portion of the inner blade holding base 44 to engage with the upper end (spherical portion) of the inner blade driving shaft 60. ing. That is, the spherical portion at the upper end of the inner blade drive shaft 60 enters the recess formed in the lower portion of the inner blade holding base 44 of the inner blade 42 from the lower side and is slidably engaged to transmit the driving force. Is possible. In addition, the said engagement structure is an example and you may employ | adopt another joint structure.

  On the other hand, the outer cutter 22 is formed with a large number of scissors entrances on the upper surface 22a (that is, penetrating from the top surface 22a to the bottom surface), and the scissors entering the scissors entrance are sandwiched between the lower end portion and the inner cutter 42. To cut. The outer cutter 22 has a substantially cup-like shape with its peripheral edge bent downward, and is configured to be fitted in a direction from the lower surface side to the upper surface side of the outer blade frame 32 described later. Thereby, the outer cutter 22 is configured to be held so as to be movable up and down and swingable with respect to the outer cutter frame 32 while being pressed from below by the inner cutter 42 described above. In addition, various shapes, such as a radial slit shape, a round hole shape, or those combinations, can be employ | adopted for the sliding entrance.

  As described above, the inner blade 42 is configured to be held by the inner blade drive shaft 60 held by the inner blade drive bearing 61 and to come into contact with the outer blade 22. According to this configuration, by being held swingably by the spherical portion of the inner blade drive shaft 60, it is possible to follow the tilting of the outer blade 22, and furthermore, the coil spring (not shown) of the inner blade drive bearing 61. ) Can follow the vertical movement of the outer cutter 22, so that the inner cutter 42 is always pressed against the lower surface of the outer cutter 22. In this embodiment, three sets of independent blade units 16 each having a configuration in which the inner blade 42 is pressed from the lower surface side are formed for the three outer blades 22.

  With the above configuration, the blade unit 16 is assembled, so that the upper end surface of the small blade 42 a of the inner blade 42 comes into contact with the lower surface of the outer blade 22. In this state, the inner blade 42 is rotationally driven, whereby the scissors that have entered the scissors entrance can be cut with the cutting edge of the inner blade (the tip of the small blade 42a).

  Next, the blade frame 30 that is characteristic of the present embodiment will be described in detail. As shown in FIGS. 1-3, while having the some outer blade frame 32 with which each outer blade 22 is mounted | worn separately, the adjacent outer blade frames 32 are connected by the connection part 34, and the structure integrated. I have. Here, FIG. 3 is a perspective view of the blade frame 30 as viewed from the lower surface side (note that the inner blade 42, the inner blade receiver 54, and the like are also illustrated).

  At this time, the adjacent outer blade frames 32 are connected with play so that they can be bent at the connecting position X connected by the connecting portion 34. More specifically, as shown in FIGS. 4 (a) and 4 (b) when the adjacent outer blade frames 32 are viewed from the side, they can be bent at the connecting position X connected by the connecting portion 34, that is, adjacent to each other. The angle θ formed between the upper surfaces of the outer cutter frame 32 is 180 [°] or less and 180 [°] or more. Note that the above-described configuration is adopted in all the adjacent outer blade frames 32.

  According to said structure, as shown to operation | movement explanatory drawing of Fig.6 (a), 6 (b), the structure which all the outer blade frames 32 which comprised the blade frame 30 move interlockingly. Is realized so that the upper surface 30a of the blade frame 30 is convex (see FIG. 6A) and can be deformed between a concave surface (see FIG. 6B). It becomes possible. Thus, since the upper surface 30a of the blade frame 30 can realize a structure that can be deformed between the convex surface and the concave surface, the followability to the user's skin is improved, and the shaving performance and the shaving comfort are improved. Can be improved.

  Further, for example, according to the configuration of the present embodiment, compared to the conventional technique (see Patent Document 1) in which the outer blade is tilted by holding the outer blade on the outer blade frame via a support rim or the like. Since the blade frame body 30 (outer blade frame 32) can directly realize a configuration for holding the outer blade 22, and can realize a configuration in which the upper surface 30a of the blade frame body 30 is deformed between a convex surface and a concave surface. The movable part and the gap in the outer blade holding structure can be reduced, and the problem that dirt accumulates in the gap can be solved. Therefore, it is possible to provide a clean electric razor. In addition, it is possible to improve the appearance in terms of design.

  In addition, although the structure of the connection part 34 is not specifically limited, The connection part 34 which concerns on this embodiment is the 1st connection part 34A provided in the outer edge part of the blade frame 30, and the blade frame 30. And a second connecting portion 34B provided near the center (between the outer edge portion and the central portion).

  Here, both of the first connecting portion 34A and the second connecting portion 34B according to the present embodiment have a snap-fit engagement structure, so that the connection is not released. As a result, the blade frame 30 formed as a connection body of the plurality of outer blade frames 32 can be configured as an integral structure capable of the above deformation. Note that only one of the first connecting portion 34A and the second connecting portion 34B is sufficient as a snap-fit engagement structure.

  More specifically, as shown in FIG. 5, which is an enlarged view seen from the lower surface side of one outer blade frame 32 that constitutes the blade frame body 30, the first connecting portion 34 </ b> A has one outer blade adjacent to each other. A first snap-fit engagement protrusion 34A1 is provided on the frame 32, and a first snap-fit engagement groove 34A2 is provided on the other outer blade frame 32. The connecting portion 34 can be configured so as not to be performed. Further, by setting the respective dimensions and shapes so that the engagement between the first snap-fit engagement protrusion 34A1 and the first snap-fit engagement groove 34A2 is performed with play, the connecting portion 34 At the connected position X, the adjacent outer blade frames 32 can be bent, and the upper surface 30a of the blade frame 30 can be deformed into a convex surface and a concave surface.

  Similarly, with respect to the second connecting portion 34B, a second snap-fit engagement protrusion 34B1 is provided on one outer blade frame 32 adjacent to each other, and a second snap-fit engagement is performed on the other outer blade frame 32. The groove 34B2 is provided, and the coupling portion 34 can be configured so that the coupling is not released by snap-fitting the both. Similarly to the above, by setting the respective dimensions and shapes so that the engagement between the second snap fit engagement protrusion 34B1 and the second snap fit engagement groove 34B2 is performed with play, In the connection position X connected by the connection part 34, the adjacent outer blade frame 32 can be bent, and the upper surface of the blade frame body can be deformed into a concave surface and a convex surface.

  The blade frame 30 formed as an integral structure that can be deformed is engaged with and held by the head case 12. In the present embodiment, an engagement member 36 that is engaged with the head case 12 is provided on each outer blade frame 32 constituting the blade frame body 30. More specifically, the engagement member 36 is fitted into a fitting hole 35 provided in the head case 12, and a fulcrum shaft member 37 that supports the outer blade frame 32 in a swingable and detachable manner, and the fulcrum shaft. And a second urging member 38 that urges the member 37 in the direction of entering the fitting hole 35 (the arrow direction in FIG. 7). As described above, each outer blade frame 32 can swing with respect to the head case 12 and the adjacent outer blade frames 32 can be bent to form a connected body of the outer blade frames 32. The said deformation | transformation of the blade frame 30 to be performed is possible. In addition, although the wire spring is used for the 2nd biasing member 38 which concerns on this embodiment, it is not limited to this.

  As an example, as shown in FIG. 7, the fulcrum shaft member 37 has a shaving of the outer blade 22 in a plan view in which the axis L1 serving as a swing axis when the outer blade frame 32 is swung with respect to the head case. It passes through a position coinciding with the center C1 of the surface, and is provided in an arrangement orthogonal to the line L2 connecting the center C2 of the blade frame 30 and the center C1 of the shaving surface (see FIG. 7). As a modification, the passing position of the axis L1 may be arranged to pass through a position in the vicinity of the position that coincides with the center C1 (for example, a position within a distance of about 5 [mm] from the center C1). In this way, by slightly shifting the passage position of the axis L1 from the center C1, the upper surface of the blade frame 30 is caused by the pressing force of the inner blade 42 against the outer blade 22 generated by the coil spring provided in the inner blade driving bearing 61 described above. It is possible to realize a configuration that changes between a convex surface and a concave surface according to an external force while maintaining the convex surface.

  Here, in this embodiment, the 1st biasing member 56 always urged | biased from the lower surface side of the blade frame 30 is provided so that the upper surface 30a of the blade frame 30 may become a convex surface. The first urging member 56 is provided (connected) to a movable shaft 52 movably held by the inner blade receiver 54, and the movable shaft 52 is directed from the lower surface to the upper surface of the blade frame 30. It is the composition which is energized. More specifically, as shown in FIGS. 2 and 3, a movable shaft 52 to which a first urging member (here, a coil spring) 56 is attached is disposed inside the cylindrical portion 54 a of the inner blade receiver 54. The urging force is applied to the movable shaft 52. As described above, the movable shaft 52 held by the inner blade receiver 54 fixed to the lower surface side of the blade frame 30 is urged by the first urging member 56 and is urged. When the shaft 52 is in contact with the lower surface side of the blade frame body 30, an action of urging the blade frame body 30 in the direction from the lower surface toward the upper surface is obtained.

  As a modified example, the blade frame 30 is moved from the lower surface by the pressing force of the inner blade 42 against the outer blade 22 generated by the coil spring provided in the inner blade driving bearing 61 without providing the first urging member. It is good also as a structure urged | biased in the direction which goes to an upper surface.

  The inner blade receiver 54 according to the present embodiment has a plurality (three in the present embodiment) of fixing protrusions 54b. Each of the fixing protrusions 54b is caused to enter a space portion between the inner blade receiving and fixing portion (here, the protruding portion) 39 and the connecting portion 34B provided on the blade frame 30 so as to correspond to the protruding protrusion pieces 54b. Thus, the inner blade receiver 54 is fixed to the blade frame 32. Here, the inner blade receiving and fixing portion (projection portion) 39 is provided on the first connecting portion 34A (here, the first snap-fit engagement projection 34A). According to this configuration, the blade frame 30 can be bent at the connecting position X where the blade frame 30 is connected by the connecting portion 34 and the entire upper surface 30a is concave while realizing the structure of holding the inner blade holder 54 by the blade frame 30. And the convex surface, and the upper surface 30a of the blade frame body 30 is always urged by the first urging member 56 from the lower surface side of the blade frame body 30 so as to be a convex surface. A configuration can be realized. “Always energizing” refers to energizing the upper surface 30a to be a convex surface when no external force is applied to the upper surface 30a of the blade frame 30, and when the external force is applied, As described above, 30a can be deformed from a convex surface to a concave surface.

  The inner blade receiver 54 has a plurality (three in this embodiment) of ring portions 54c corresponding to the number of blade units 16. That is, by setting the inner blade receiver 54 to be fixed to the blade frame 32, the inner blade 42 can be prevented from falling off by the ring portion 54 c even when the blade frame 32 is detached from the head case 12. In use (when shaving), the ring portion 54c and the inner blade 42 are not in contact (interference).

  The movable shaft 52 is provided with a groove 52a at the tip. Corresponding to this, the blade frame 30 is provided with a projection assembly 33 configured as an assembly of projections 33a formed on each outer blade frame 32 at the center position on the lower surface side. According to the above configuration, the protrusion assembly portion 33 is fitted and held in the groove portion 52 a provided in the movable shaft 52, so that the urged movable shaft 52 contacts the lower surface side of the blade frame 30. When the blade frame body 30 is contacted and urged in the direction from the lower surface to the upper surface, it can be prevented from being displaced in the lateral direction. It becomes possible to energize reliably.

  In addition, as for the protrusion assembly part 33, when the upper surface 30a of the blade frame 30 is deform | transformed into a convex surface, the approximate shape which an external appearance makes in the state which the protrusion 33a gathered becomes a truncated cone shape, The upper surface 30a of the blade frame 30 is When deformed into a concave surface, the rough shape formed in the appearance in a state where the protruding portions 33a are gathered is formed to be a columnar shape. Thereby, even when the upper surface 30a of the blade frame 30 is deformed, the state in which the projection assembly portion 33 is securely fitted to the groove portion 52a of the movable shaft formed in the cylindrical shape is maintained. It becomes possible.

As described above, according to the rotary electric shaver 1 according to the present invention,
In a configuration in which the outer blade 22 is directly held by the blade frame body 30 (outer blade frame 32), the outer blade 22 can be moved up and down and tilted with respect to the blade frame body 30 (outer blade frame 32). In addition to this, it is possible to realize a configuration that can be deformed between a state in which the upper surface 30a of the blade frame 30 is a convex surface and a state in which the blade frame body 30 is a concave surface. With this configuration, the user's ability to follow the skin can be improved, and the shaving performance and shaving comfort can be improved.

  Further, for example, compared with the prior art in which the outer blade is held on the outer blade frame via a support rim and the outer blade is tilted, the blade frame 30 (outer blade frame 32) directly Since the configuration for holding the blade 22 can be realized and the configuration for deforming the upper surface 30a of the blade frame 30 with the concave surface and the convex surface can be realized, the movable part and the gap in the outer blade holding structure can be reduced. It is possible to solve the problem that dirt accumulates in the gap. In this way, it is possible not only to maintain cleanliness but also to give a clean and refined impression in terms of design.

  Moreover, since the holding structure of the outer cutter 22 in the head part 3 can be realized with a small number of parts, the structure can be simplified and the cost can be reduced.

  The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the present invention. In particular, the rotary electric shaver having three sets of blade units has been described as an example. However, the present invention is not limited to this, and the rotary type has a plurality of sets (for example, four sets, five sets, etc.) of blade units. It can also be applied to electric razors.

DESCRIPTION OF SYMBOLS 1 Rotary type electric shaver 2 Main-body part 3 Head part 10 Case 12 Head case 14 Power switch 16 Blade unit 22 Outer blade 30 Blade frame body 32 Outer blade frame 34 Connection part 34A 1st connection part 34B 2nd connection part 36 engagement Joint member 37 Support shaft member 38 Second urging member 39 Inner blade receiving / fixing portion 42 Inner blade 44 Inner blade holding base 52 Movable shaft 52a Groove portion 54 Inner blade receiving 56 First urging member 60 Inner blade driving shaft 61 Inside Blade drive bearing X connection position

Claims (5)

A blade frame body in which a plurality of blade units having an outer blade having an annular shaving surface on the upper surface and an inner blade rotating in sliding contact with the lower surface of the outer blade are disposed on the head case held by the main body. A rotary electric razor mounted,
The blade frame is
While having a plurality of outer blade frames to which each outer blade is individually mounted, and having a connecting portion to which the adjacent outer blade frames are connected,
The adjacent outer blade frames are connected with play so that they can be bent at the connection position, and are held by the head case so that the upper surface of the blade frame body is a convex surface,
When at least one of the outer blade frames is pressed, all of the connected outer blade frames move in conjunction with each other and can be deformed so that the upper surface of the blade frame body is concave. Rotary electric razor. As the connection part, it has a first connection part provided at the outer edge part of the blade frame body, and a second connection part provided near the center of the blade frame body,
2. The rotary type according to claim 1, wherein at least one of the first connection portion and the second connection portion has a snap-fit engagement structure so that the connection is not released. Electric razor. The blade frame has a projection assembly part as an assembly of projections formed on each outer blade frame at the center position on the lower surface side,
The protrusion assembly portion is fitted in a groove portion provided on a movable shaft that is held so as to be movable up and down by an inner blade receiver fixed to the lower surface side of the blade frame body,
The blade frame body is biased by biasing the movable shaft in a direction from the lower surface to the upper surface of the blade frame body by the first biasing member. 2. The rotary electric razor according to 2. The blade frame body has an engagement member to be engaged with the head case in each outer blade frame,
The engaging member is fitted into a fitting hole provided in the head case, and a fulcrum shaft member that swingably and detachably supports the outer cutter frame, and the fulcrum shaft member to the fitting hole. The rotary electric shaver according to any one of claims 1 to 3, further comprising a second urging member that urges in a direction of entering. The fulcrum shaft member passes through a position where the axis serving as the axis of swinging coincides with or near the center of the shaving surface of the outer blade in plan view, and the center of the blade frame and the flange The rotary electric shaver according to claim 4, wherein the rotary electric shaver is provided in an arrangement perpendicular to a line connecting the center of the shaving surface.

Images