JP6379068B2 - Razor blade - Google Patents

Description

  The present invention relates to a razor blade, and more particularly to a razor blade used for facial shaving in a barber shop, for example.

This type of razor blade includes a covering member that partially covers the blade edge of the blade body in the width direction, and protects the skin from the blade edge during shaving.
As such a razor blade, there is a razor blade provided with a wire wound around a blade as a covering member, and a razor blade provided with a thin plate that is bent on the blade edge side and sandwiches both side surfaces of the blade (for example, see Patent Document 1) .

  By the way, in order to deeply shave an eyelid, it is one of the important elements that the blade edge easily captures the root of the hair by raising hair against the skin. For that purpose, it is effective to give tension to the skin by pulling the skin with a finger or the like.

  Patent Document 2 discloses a razor provided with a bulging portion that bulges in an arc shape with respect to the outside in order to dent the skin in a portion that comes into contact with the skin in a holder that holds a replaceable blade. According to the razor described in Patent Document 2, the skin is pressed by the bulging portion of the holder immediately before the blade edge comes into contact with the hair, thereby applying tension to the skin.

  Patent Document 3 discloses a razor in which two blades are stacked. According to the razor described in Patent Document 3, at the time of shaving, the hair is first cut and pulled by the upper blade. Next, the pulled hair is cut by the lower blade.

Japanese Patent No. 3393289 Japanese Patent No. 4786019 Japanese Utility Model Publication No. 49-50193

  By the way, in the conventional razor including what is described in patent document 1 and patent document 2, the maximum load at the time of shaving is large, and this leaves the room for improvement in improving shaving comfort. Yes.

  Further, in the case of the razor described in Patent Document 3, before the hair is cut by the lower blade, the hair may be cut by the upper blade. Therefore, it may not be possible to appropriately shave such as a heel. Further, the blade body is chemically treated for the purpose of improving durability and shaving comfort. For this reason, when a plurality of expensive blades are superposed, another problem such as an increase in manufacturing cost arises.

  The objective of this invention is providing the razor blade which can improve shaving comfort by simple structure.

  A razor blade for achieving the above object includes a blade body and a support portion fixed to at least one side surface of the blade body, the support portion sandwiching the blade body during shaving and skin Is located on the opposite side, and the tip of the support portion is at the same position as the cutting edge of the blade body or a position retracted from the cutting edge, and presses the hair before the cutting edge contacts the hair. In the position.

  At the time of shaving, the replacement blade is slid along the skin while bringing the blade tip into contact with the skin. At this time, according to the razor blade having the above-described configuration, the tip of the support portion presses the hair before the blade edge comes into contact with the hair. For this reason, the hair is pulled from both sides by the skin supporting the hair root and the support portion of the replacement blade, and is cut by the blade body in a stable posture. Thereby, the cut surface of the hair tends to be flat. Therefore, the maximum load at the time of shaving can be reduced. Further, the support part only supports the hair, and there is no possibility that the hair is cut by the support part. Therefore, shaving comfort can be improved with a simple configuration.

The said razor blade WHEREIN: The aspect that the said support part is provided in the both sides | surfaces of the said blade body is preferable.
In a razor, the replacement blade can often be attached to the holder even if one side surface of the replacement blade is directed to either the front side or the back side of the holder.

  According to the above aspect, since the support portion is provided on both side surfaces of the blade body, when the replacement blade is attached to the holder with one side surface of the replacement blade facing either the front surface side or the back surface side of the holder Even so, the support part is located on the opposite side of the skin with the blade between them during shaving. Therefore, the above effects can be achieved regardless of the direction in which the replacement blade is mounted on the holder.

  The razor blade includes a covering member that sandwiches both side surfaces of the blade body and partially covers the blade edge in the width direction, and the covering member covers the blade edge and removes skin from the blade edge during shaving. A protective portion for protecting, and an exposed portion that is provided adjacent to the protective portion and exposes the blade edge, and a tip of the support portion is formed by an edge of the exposed portion extending in the width direction. Such an embodiment is preferable.

  According to this aspect, the support portion can be formed by setting the edge of the exposed portion of the covering member extending in the width direction to a position where the blade edge is pressed before the blade contacts the hair. Therefore, in addition to the effect of protecting the skin from the cutting edge by the covering member, the effect of improving the shaving feeling can be achieved with a simple configuration.

In the razor blade, it is preferable that the distance from the blade edge to the tip of the support portion differs depending on the position of the blade edge in the width direction.
In the razor blade of the same aspect, there are a portion having a long distance and a short portion from the blade edge to the tip of the support portion (hereinafter simply referred to as a distance). For this reason, even if the individual difference at the time of manufacture arises, hair will be pressed by either the said long site | part and a short site | part. Therefore, the effect that shaving comfort can be improved with a simple configuration can be more reliably achieved.

  According to the present invention, the shaving feeling can be improved with a simple configuration.

The perspective view of a razor about one Embodiment of a replaceable blade type razor. (A) is a perspective view of the replaceable blade of the embodiment, (b) is a partially enlarged view of (a). Sectional drawing along the 3-3 line of FIG.2 (b). The top view centering on the blade edge | tip of the replaceable blade in the embodiment. (A) is a perspective view of the coating | coated member before bending, (b) is the elements on larger scale of (a). (A) is sectional drawing for demonstrating the effect | action of the replaceable blade of the embodiment, (b) is the elements on larger scale of (a). Sectional drawing for demonstrating the effect | action of the replaceable blade of a comparative example. Sectional drawing, such as a jig | tool for demonstrating the method of a verification test. (A)-(F) is a figure which shows the positional relationship of the fishing line fixed to the fixing jig, and the spare blade of this embodiment. It is a graph which shows the relationship between the position of a replaceable blade, and the load which acts on a replaceable blade, Comprising: The graph which shows the measurement result at the time of using the replaceable blade of this embodiment. (A)-(F) is a figure which shows the positional relationship of the fishing line fixed to the fixing jig, and the spare blade of a comparative example. It is a graph which shows the relationship between the position of a replaceable blade, and the load which acts on a replaceable blade, Comprising: The graph which shows the measurement result at the time of using the replaceable blade of a comparative example. It is a graph which shows the relationship between the position of a replaceable blade, and the load which acts on a replaceable blade, Comprising: The measurement result at the time of using the replaceable blade of this embodiment, and the measurement result at the time of using the replaceable blade of a comparative example The graph which shows together. The photograph of the fishing line cut | disconnected by the spare blade of this embodiment. The photograph of the fishing line cut with the spare blade of the comparative example. The top view centering on the blade edge | tip of the replaceable blade of a modification. The top view centering on the blade edge | tip of the replaceable blade of another modification. The top view centering on the blade edge | tip of the replaceable blade of another modification. Sectional drawing of the replaceable blade of another modification.

Hereinafter, with reference to FIGS. 1-15, one Embodiment which actualized the razor blade as a replaceable blade of a replaceable blade type razor is described.
As shown in FIG. 1, a replaceable blade razor (hereinafter referred to as “razor 10”) is used for face shaving or the like in a barber shop, and includes a holder 20 and a replaceable blade 30.

  The holder 20 is opposed to an inner side surface (not shown) of a long holder main body 21, a handle member 22 fixed to the proximal end portion of the holder main body 21, and a fixed clamping portion 23 formed at the distal end portion of the holder main body 21. The movable clamping plate 24 is provided. The movable clamping plate 24 is provided so as to be slidable with respect to the fixed clamping unit 23, and the replacement blade 30 is clamped between the fixed clamping unit 23 and the movable clamping plate 24.

  As shown in FIGS. 2A, 2 </ b> B, and 3, the replaceable blade 30 sandwiches one blade body 40 and both side surfaces of the blade body 40 and partially cuts the blade edge 41 in the width direction W. It is comprised by the one coating | coated member 50 to coat | cover.

  As shown in FIG. 2A, the replaceable blade 30 basically has a bilaterally symmetric shape, and one side surface of the replaceable blade 30 is directed to either the front side or the back side of the holder 20. However, the replacement blade 30 can be attached to the holder 20.

  The blade body 40 is formed of a stainless steel plate having a substantially rectangular shape as a whole, and a blade edge 41 is formed at the upper end in FIGS. 2 (a), 2 (b) and FIG. In this embodiment, the thickness of the blade body 40 (excluding the blade edge 41) is 0.15 mm.

  The covering member 50 includes a pair of plate portions 51 that cover both side surfaces of the blade body 40, a plurality of protection portions 52 that cover the blade edge 41 and protect the skin surface from the blade edge 41 during shaving, and a protection portion 52. And an exposed portion 54 that is provided adjacently and exposes the blade edge 41.

  The covering member 50 is formed by bending a stainless steel plate shown in FIG. 5A in half on the cutting edge 41 side. As shown in FIGS. 5A and 5B, a plurality of through holes 53 extending in the width direction W are formed in the bent portion of the stainless steel plate, and between the through holes 53, The protective portion 52 that connects the pair of plate portions 51 is formed. The exposed portion 54 is formed by each through hole 53.

In the present embodiment, the thickness of the covering member 50 is 0.1 mm. The covering member 50 is fixed to the blade body 40 by spot welding.
As shown in FIGS. 2A, 2B and 4, the edge of the exposed portion 54 extends in the width direction W and has a wave shape. For this reason, the distance d from the blade edge 41 to the edge of the exposed portion 54 differs depending on the position of the blade edge 41 in the width direction W.

  As shown in FIG. 4, in this embodiment, the minimum value dmin of the distance d is 0.15 mm, and the maximum value dmax of the distance d is 0.30 mm. Further, the blade edge 41 and the support portion 34 are exposed to the outside of the holder 20 in the mounted state in which the replacement blade 30 is sandwiched by the holder 20.

Next, the operation of this embodiment will be described.
During shaving, the replaceable blade 30 is slid along the skin S while the blade edge 41 is in contact with the skin S.

  At this time, as shown in FIGS. 6 (a) and 6 (b), according to the razor 10 provided with the replacement blade 30 of the present embodiment, the skin is sandwiched between the blade body 40 before the blade edge 41 contacts the hair H. The edge of the exposed portion 54 located on the opposite side of S, that is, the tip of the support portion 34 presses the hair H. For this reason, the hair H is pulled from both sides by the skin S that supports the hair root H1 and the support portion 34 of the replacement blade 30, and is cut by the blade body 40 in a stable posture. Thereby, the cut surface of the hair H tends to be flat. Therefore, the maximum load Fmax during shaving can be reduced. In FIGS. 6A and 6B, the force acting on the hair H from the blade body 40 is indicated by F1, and the force acting on the hair H from the support portion 34 is indicated by F2.

  Moreover, the support part 34 only supports the hair H, and there is no possibility that the hair H is cut by the support part 34. In addition, in the same figure, illustration of the protection part 52 of the coating | coated member 50 is abbreviate | omitted.

  On the other hand, as shown in FIG. 7, since the razor 110 provided with the spare blade 130 of the comparative example does not include the support portion 34, the hair H is cut in an unstable posture. Thereby, the cut surface of the hair H tends to be curved. Therefore, the maximum load Fmax at the time of shaving becomes large compared with the replaceable blade 30 of this embodiment. In FIG. 7, the force acting on the hair H from the blade body 140 is indicated by F0.

  In many conventional replaceable blades provided with a covering member, the distance from the blade edge to the edge of the exposed portion is 1 mm or more. However, in the case of such a conventional replaceable blade, the edge of the exposed portion is located in the holder and does not have a function of pressing the hair H.

  The distance d from the blade edge 41 to the edge of the exposed portion 54 is preferably 0.40 mm or less, and more preferably 0.35 mm or less. Note that these numerical values can be appropriately changed within the scope of the object of the present invention.

  Next, with reference to FIGS. 8-13, the test for verifying the reduction effect of the maximum load Fmax at the time of shaving by the replaceable blade 30 of this embodiment and its result are demonstrated. In this verification test, a fishing line 61 having a diameter of 0.145 mm is used so as to correspond to a human rod having a diameter of 0.10 mm to 0.15 mm.

  As shown in FIG. 8, the fishing line 61 is cut by fixing the base end portion of the fishing line 61 to the fixing jig 60 made of ABS resin and sliding the blade 30 along the surface of the fixing jig 60. At the same time, the position of the replaceable blade 30 and the load acting on the replaceable blade 30 were measured. The moving speed of the replaceable blade 30 was 1.0 mm / min. The distance from the surface of the fixing jig 60 to the blade edge 41 was set to 0.15 mm. The inclination angle of the replacement blade 30 with respect to the surface of the fixing jig 60 was set to 60 degrees. The fishing line 61 is Trout3lb manufactured by Silver Thread.

Moreover, the same measurement was performed for the replaceable blade 130 of the comparative example.
Next, with reference to FIG.9 and FIG.10, the measurement result at the time of using the replaceable blade 30 of this embodiment is demonstrated. The positions of arrows A to F in the graph of FIG. 10 correspond to the positions of FIGS. 9 (A) to (F), respectively.

  As shown in FIGS. 9A to 9C, when the replaceable blade 30 is slid, first, only the support portion 34 presses the fishing line 61. At this time, as indicated by arrows A to C in FIG. 10, the load acting on the replacement blade 30 gradually increases as the sliding amount of the replacement blade 30 increases.

  Subsequently, as shown in FIGS. 9C to 9E, when the fishing line 61 is pressed by the support portion 34 and the blade edge 41 is cut into the root of the fishing line 61, the arrows C to E in FIG. As shown, the load acting on the replaceable blade 30 increases more rapidly than before as the sliding amount of the replaceable blade 30 increases.

Further, as indicated by an arrow E in FIGS. 9E and 10, the load becomes maximum immediately before the fishing line 61 is cut.
Thereafter, as shown in FIGS. 9E and 9F, when the fishing line 61 is cut, as shown by arrows E and F in FIG.

  The cut surface of the fishing line 61 at this time was substantially flat as shown at the left end of FIG. This is because the fishing line 61 is pulled from both sides by the fixing jig 60 that supports the base end of the fishing line 61 and the support portion 34 of the replaceable blade 30, and is cut by the blade body 40 in a stable posture.

  Next, with reference to FIG.11 and FIG.12, the measurement result at the time of using the replaceable blade 130 of a comparative example is demonstrated. The positions of arrows A to F in the graph of FIG. 12 correspond to the positions of FIGS. 11 (A) to (F), respectively.

  As shown in FIGS. 11A and 11B, when the replaceable blade 130 is slid, it acts on the replaceable blade 130 as indicated by arrows A and B in FIG. 12 until the cutting edge 141 contacts the fishing line 61. The load to be applied hardly changes.

  When the cutting edge 141 is cut into the root of the fishing line 61 as shown in FIGS. 11B to 11E, as the sliding amount of the replacement blade 130 increases as shown by arrows B to E in FIG. The load acting on the replaceable blade 130 increases more rapidly than before.

As shown by the arrow E in FIG. 11 (E) and FIG. 12, the load becomes maximum immediately before the fishing line 61 is cut.
Thereafter, as shown in FIGS. 11 (E) and 11 (F), when the fishing line 61 is cut, as shown by arrows E and F in FIG.

  The cut surface of the fishing line 61 at this time was curved as shown at the left end of FIG. It can be said that this is because the attitude of the fishing line 61 is not stable when the fishing line 61 is cut by the blade body 140.

As shown in FIG. 13, according to the replaceable blade 30 of the present embodiment, it was verified that the maximum load Fmax required for cutting the fishing line 61 is significantly reduced as compared with the replaceable blade 130 of the comparative example.
Incidentally, the maximum load Fmax required for cutting the fishing line 61 was measured at five different positions of the replaceable blades 30 and 130, and the average value thereof was calculated. As a result, the average value of the maximum load Fmax when the replaceable blade 30 of the present embodiment was used was 29.7 gf, whereas the average value of the maximum load Fmax when the replaceable blade 130 of the comparative example was used. Was 56.8 gf. Therefore, according to the replaceable blade 30 of the present embodiment, it can be said that the maximum load Fmax can be reduced by about 48% compared to the replaceable blade 130 of the comparative example.

According to the razor blade according to the present embodiment described above, the following effects can be obtained.
(1) The replaceable blade 30 includes a blade body 40 and a support portion 34 fixed to the side surface of the blade body 40. The support portion 34 is positioned on the opposite side of the skin with the blade body 40 sandwiched during shaving, and the tip of the support portion 34 is a position retracted from the blade edge 41, and the blade edge 41 becomes the hair H. Prior to contact, the hair H is provided at a position where it is pressed.

  According to such a configuration, the maximum load Fmax during shaving can be reduced. Moreover, the support part 34 supports the hair H, and there is no possibility that the hair H is cut by the support part 34. Therefore, shaving comfort can be improved with a simple configuration.

Moreover, since the load required for shaving can be reduced, the durability of the blade edge 41 can be improved.
(2) Since the support portions 34 are provided on both side surfaces of the blade body 40, the replaceable blade 30 faces the holder 20 with one side surface of the replaceable blade 30 facing either the front surface side or the back surface side of the holder 20. Even in the case of attachment, the support portion 34 is located on the opposite side of the skin with the blade body 40 sandwiched during shaving. Therefore, the above effect (1) can be achieved regardless of the direction in which the replacement blade 30 is attached to the holder 20.

(3) The tip of the support portion 34 is formed by the edge of the exposed portion 54 of the covering member 50.
According to such a configuration, the support portion 34 can be formed by setting the edge of the exposed portion 54 in the covering member 50 at a position where the edge 41 presses the hair H before the blade edge 41 contacts the hair H. Therefore, in addition to the effect which protects skin from the blade edge | tip 41 with the coating | coated member 50, there can exist said effect (1).

  (4) The replaceable blade 30 includes a covering member 50 having a protection part 52. For this reason, the protection part 52 will slip on the skin S at the time of shaving, and shaving can be performed smoothly. Further, even if the blade edge 41 slides with respect to the skin S, the skin S can be protected from the blade edge 41.

(5) The edge of the exposed portion 54 extends in the width direction W and has a wave shape, and the distance d from the blade edge 41 to the edge of the exposed portion 54 varies depending on the position of the blade edge 41 in the width direction.
According to such a configuration, the replaceable blade 30 has a portion where the distance d from the blade edge 41 to the tip of the support portion 34 is long and a portion where the distance d is short. For this reason, even if the individual difference at the time of manufacture arises, the hair H will be pressed by either the said long site | part or a short site | part. Therefore, the effect that shaving comfort can be improved with a simple configuration can be more reliably achieved.

(6) The razor 10 includes a replaceable blade 30 and a holder 20 that holds the replaceable blade 30 in a state where the blade tip 41 and the support portion 34 are exposed.
According to such a configuration, the effect (1) can be reliably achieved.

<Modification>
In addition, the said embodiment can also be changed as follows, for example.
In the above embodiment, the edge of the exposed portion 54 is wave-shaped, but as shown in FIG. 16, the edge of the exposed portion 54 may have a concavo-convex shape with sides orthogonal to the cutting edge 41. Moreover, as shown in FIG. 17, it can also be set as the uneven | corrugated shape which has the edge | side which inclined the edge of the exposed part 54 toward the blade edge | tip 41, ie, trapezoid shape. Moreover, as shown in FIG. 18, the edge of the exposed part 54 can also be made linear. In the modification shown in FIG. 18, for example, it is preferable to set the distance d from the blade edge 41 to the edge of the exposed portion 54 so as to be included between the minimum value dmin and the maximum value dmax exemplified in the above embodiment. .

  The support portion 34 is not limited to the one formed by the edge of the exposed portion 54 of the covering member 50. In the case of a replaceable blade that does not include the covering member 50, a plate material that functions as a support portion may be fixed to the side surface of the blade body 40 by spot welding or an adhesive.

-The support part 34 is not limited to what is provided in the both sides | surfaces of the blade body 40, but should just be fixed to the at least one side surface of the blade body 40. FIG.
-The support part 34 is not limited to what is formed by stainless steel, You may form by other metal materials, such as aluminum, a hard resin material, an amorphous (amorphous) material, etc.

  In the above embodiment, the spare blade 30 of the business razor 10 used in the barber is illustrated, but it can also be embodied as a general razor blade such as a long handle razor or a T-shaped razor. Further, the razor blade is not limited to a replacement blade that can be attached to and detached from the holder, but may be one that is not attachable to and detachable from the holder.

  In the above embodiment, the tip of the support portion 34 is set at a position retracted from the blade edge 41, but the tip of the support portion 34 can also be set at the same position as the blade edge 41 as shown in FIG. Even in this case, the maximum load at the time of shaving can be reduced and shaving comfort can be improved.

  DESCRIPTION OF SYMBOLS 10,110 ... Razor, 20 ... Holder, 21 ... Holder main body, 22 ... Handle member, 23 ... Fixed clamping part, 24 ... Movable clamping plate, 30, 130 ... Replacement blade, 34 ... Support part, 40, 140 ... Blade body 41, 141 ... blade edge, 50 ... covering member, 51 ... plate part, 52 ... protective part, 53 ... through hole, 54 ... exposed part, 60 ... fixing jig, 61 ... fishing line, H ... hair, H1 ... hair root, S ... Skin.

Claims (2)

A blade,
And it provided et the support part on both sides of the blade body,
A covering member that sandwiches both side surfaces of the blade body and partially covers the blade edge in the width direction thereof ,
The covering member has a protective part that covers the blade edge and protects the skin from the blade edge during shaving, and an exposed part that is provided adjacent to the protective part and exposes the blade edge,
The front end of the support portion is formed by an edge of the exposed portion extending in the width direction, and is between a blade edge of the blade body and a base end of an inclined surface inclined from both side surfaces of the blade body toward the blade edge. The tip of the support portion located on the opposite side of the skin across the blade body during shaving is provided to press the hair prior to the blade tip contacting the hair,
Razor blade. The distance from the blade edge to the tip of the support portion is different depending on the position in the width direction of the blade edge,
The razor blade according to claim 1 .