JP4598419B2 - Safety razor - Google Patents

Description

  The present invention relates to a safety razor for use by the general public.

There is a safety razor in which each of at least four blades is disposed at the rear portion so that the exposure value is increased (see, for example, Patent Document 1).
Further, there are safety razors having three blades, in which the exposure value or individual exposure value of the lower blade is larger than that of the upper blade, or those having different blade thicknesses (for example, Patent Document 2, Patent Document 3, Patent) Reference 4).
JP 2003-62369 A Japanese Patent No. 3321237 Japanese Patent No. 3213692 Japanese Patent No. 3213693

  At present, safety razors having three blades are generally widespread, and there are patent documents relating to three-blade safety razors. Among the patent documents, there are those related to numerical values for the blade of a safety razor such as an exposure value. This is because this value is an important factor in the shaving taste when using a safety razor. However, a safety razor with four blades has just appeared in the last few years, and it cannot be said that research has been sufficiently accumulated and is still under development. Therefore, for example, with regard to the exposure value of the blade, it can not be said that the numerical value of the four-blade safety razor is optimally elucidated. By using the 3-blade safety razor technology as it is for 4-blade blades, it may be possible to obtain an excellent safety razor such as a shaving taste. It is also possible to do it. SUMMARY OF THE INVENTION An object of the present invention is to provide a safety razor having three or more blades, which has an excellent shave taste and is easy to handle with little shaving remaining.

  In addition, a safety razor having three or more blades is provided with a spacer between the blades. The spacer is intended to smoothly discharge whiskers that enter between the blades during use. Accordingly, an object of the present invention is to provide a safety razor that is easy to handle by improving the spacer so that it can be used for other purposes.

Claim 1 of the present invention has three or more blades, and two adjacent blades when the vertical distance from the common tangent line connecting the guard part and the top plate to the blade edge measured is the exposure value of the blade The exposure value of the blade closer to the guard part is larger than the exposure value of the rear blade, and there is at least one blade ahead of the blade closer to the guard part. the exposure value of a group of blades including all blades to be in front than the blade and blade closer, a large towards the exposure value of the blade of the rear than the front of the blade, and the top plate The blades other than the closest blade are the group of blades .

Claim 2 has the 1st, 2nd, 3rd and 4th blades in which the blade tip retreats in order from the side closer to the guard part, and the exposure values of the 1st and 4th blades are negative values, exposure value of the third blade has a positive value, the exposure value of the second blade element according to claim 1 which is smaller than the exposure value of the third blade at greater than the exposure value of the first blade It is the structure added to.

A third aspect is a configuration in which an element having a negative exposure value of the second blade is added to the second aspect.

According to a fourth aspect of the present invention, when at least the exposure values of the first blade and the second blade are negative, the exposure value of the blade having a negative value is the minimum for the first blade and the maximum for the second blade. A certain element is added to claim 3.

Claim 5, with the exposure value for each blade, the first blade -0.09Mm, second blade -0.01Mm, a third blade + 0.03 mm, the fourth blade - The element which is 0.04 mm is the structure added to Claim 4.

Claim 6 is that when the number of all the blades is an even number, one of the half blades close to the top plate, or when the number of all the blades is an odd number, the top plate rather than the center blade. Any one of the close blades is formed to have a blade thickness smaller than all the other blades, and all the other blades have the same blade thickness.

According to the seventh aspect of the present invention, each blade is overlapped and a spacer is disposed between the blades, and the spacer between the blade closest to the top plate and the blade adjacent to the front is formed in a comb shape. The tip of the comb teeth is forward of the cutting edge of the blade closest to the top plate and protrudes to a position behind the cutting edge of the blade adjacent to the front of the blade.

According to the eighth aspect of the present invention, a spacer is disposed between the blades, and the rear portion of the spacer disposed between the blade closest to the top plate and the blade adjacent to the front thereof protrudes from the rear end surface of the blade base and is bent downward. In addition, at least the rear surface portion of the spacer that is bent is colored in a color different from the color of the blade base.

Claim 1 has three or more blades, and when the vertical distance from the common tangent line connecting the guard portion and the top plate to the blade edge measured is the exposure value of the blade, the guard portion is composed of two adjacent blades. The exposure value of the blade closer to the edge is larger than the exposure value of the blade behind it, and there is at least one blade in front of the blade closer to the guard part, and the exposure value closer to the guard part The exposure value of a group of blades including the blade and all blades existing in front of the blade is larger than the front blade, and the exposure value of the blade behind the blade is closest to the top plate. The other blades are the group of blades. Therefore, the exposure value of a certain blade and a group of blades existing in front of the blade increases as it goes to the rear blade. Therefore, the rear blade with a large exposure value shave the shavings left behind by the front blade. It can prevent unshaved parts. Further, since the exposure value of the blade adjacent to the rear side is smaller than the exposure value of the certain blade, the burden from the beard applied to the blade edge adjacent to the rear side when shaving is reduced. Therefore, since the sharpness does not fall compared with other blades, the remaining shavings of other blades can be shaved reliably. Further , blades other than the blade closest to the top plate are the group of blades. Accordingly, since only the last blade that sequentially hits the beard during shaving is smaller than the exposure value of the blade adjacent to the front, the burden from the beard on the blade tip is minimized, and the sharpness of the finished blade lasts longer.

Claim 2 has the 1st, 2nd, 3rd and 4th blades in which the blade tip retreats in order from the side closer to the guard part, and the exposure values of the 1st and 4th blades are negative values, The exposure value of the third blade is a positive value, and the exposure value of the second blade is larger than the exposure value of the first blade and smaller than the exposure value of the third blade. Having four blades results in shaving the beard with four cutting edges, so it is desirable for each cutting edge to complement the other cutting edges to lighten the burden from the beard and to provide excellent sharpness. Since the exposure value of the first blade is negative and the exposure value of the second blade is smaller than the exposure value of the third blade, the first and second blades must behave in a state where the burden from the beard is not large. A third blade with a positive exposure value shaves after a shave has been made and many beards have been shaved. Since the exposure value of the third blade is positive, it is possible to shave the beard reliably, and since many beards are shaved with the first blade and the second blade before the third blade, The burden from the beard of 3 blades is not great. It is then finished with a fourth blade. Therefore, it is possible to maintain a sharp shaving for a long time while reducing the burden on the blade edge of each blade.

According to the third aspect , since the exposure value of the second blade is a negative value, the burden from the beard of the second blade is not particularly increased. According to the fourth aspect , the exposure value of the blade having a negative value is the minimum for the first blade and the maximum for the second blade. Since the first blade hits the beard first, it is the blade that receives the most burden. By making the exposure value negative and minimum, it is possible to prevent the sharpness of the first blade from dropping in a short period of time. Also, since the exposure value of the second blade is negative and maximum, most of the beard left by the first blade is shaved. In the fifth aspect , the exposure value of each blade is -0.09 mm for the first blade, -0.01 mm for the second blade, +0.03 mm for the third blade, and -0 for the fourth blade. .04 mm, and the excellent shaving taste lasts for a long time and can effectively prevent unshaved residue.

Claim 6 is that when the number of all the blades is an even number, one of the half blades close to the top plate, or when the number of all the blades is an odd number, the top plate rather than the center blade. Any one of the close blades is formed to have a blade thickness smaller than all the other blades, and the blade thicknesses of all the other blades are all equal. The blade is sharper when the blade thickness is smaller because the opening width at the time of cutting is narrower. However, when the blade thickness is reduced, the strength is reduced. In this section, the blades with small thickness are behind the center of the blades arranged in order and the burden from the beard is relatively small, so even if the blade strength is smaller than other blades, the blade will bend during shaving, etc. There is no fear of it. The sharpness can be improved by inserting one sharp blade.

  According to the seventh aspect of the present invention, each blade is overlapped and a spacer is disposed between the blades, and the spacer between the blade closest to the top plate and the blade adjacent to the front is formed in a comb shape. The tips of the comb teeth are in front of the cutting edge of the blade closest to the top plate and protrude to a position behind the cutting edge of the blade adjacent to the front of the blade. Therefore, the blades above and below the comb teeth are prevented from being bent during use.

  According to the eighth aspect of the present invention, a spacer is disposed between the blades, and the rear portion of the spacer disposed between the blade closest to the top plate and the blade adjacent to the front thereof protrudes from the rear end surface of the blade base and is bent downward. And at least the bent rear surface portion of the spacer is colored in a color different from the color of the blade base. When the replaceable blade is stored in the replaceable blade case, the replaceable blade is stored in an oblique state so that the bottom surface of the blade base faces upward and the rear end is slightly higher than the front end of the replaceable blade. Therefore, when the replaceable blade stored in the replaceable blade case is viewed from above, the rear end surface of the replaceable blade can be visually observed. This means that the colored color on the surface of the end portion bent below the spacer can be visually observed. Thereby, since the front and back of the stored replacement blade can be discriminated, the front and rear of the replacement blade will not be mistaken when the stored replacement blade is attached to the holder in the stored state.

  The embodiment relates to a spare blade having four blades. Of course, it may be a safety razor in which the blade is integrally attached to the holder. The replaceable blade has a first blade 1 whose blade tip is retracted in order from the side closer to the guard portion 10, a second blade 2, a third blade 3, and a fourth blade 4. The four blades 1, 2, 3, 4 are sandwiched between the blade base 20 and the top plate 21, and a first spacer 6, a second spacer 7, and a third spacer 8 are interposed between the blades. Intervene. The pin 9 provided on the lower surface of the top plate 21 extends to the lower surface of the blade base 20 through the blades and the insertion portions of the spacers, and by crushing the tip of the pin 9, the blade base 20 and the top plate 21 are combined. Yes.

  As shown in FIG. 1, the rear portions of the spacers 6, 7, 8 protrude from the rear end surface 12 of the blade base and are bent vertically downward. FIG. 3 is a plan view and a side view of the state before the rear portion of the third spacer 8 is bent, and it is shown from the plan view that the planar shape of the third spacer 8 before bending is a comb shape. The planar shapes of the other first spacers 6 and the second spacers 7 are slightly different from those of the third spacers 8 but are comb-shaped. The reason why each spacer 6, 7, 8 is comb-shaped and the rear part is bent is that the space between the comb teeth 13, 13 is removed from the rear end of the replaceable blade by bending the comb teeth 13 of that part. Thus, it is for enabling the whiskers accumulated between the comb teeth 13 and 13 to be discharged to the outside from the rear end of the replacement blade. In addition, the round hole provided in each comb tooth 13 is the insertion part 14, Comprising: The pin 9 is penetrated.

  The third spacer 8 shown in FIG. 3 is formed using aluminum as a material, and a coating film is formed on the surface. The coating film consists of two layers, and the layer in contact with aluminum is formed of a thermosetting epoxy resin and has a thickness of approximately 2 μm, but may be larger. The surface layer is formed of a thermosetting polyester resin containing an antibacterial agent, and the thickness is preferably about 18 μm or more and about 60 μm or less. As the antibacterial agent, for example, hinokitiol is used. The surface layer is colored yellow. The coloring does not have to be yellow and may be any color different from the blade base 20. For example, when the blade base 20 is black, it may be green or blue in addition to yellow.

  As shown in the side view of the third spacer 8 in FIG. 3, the upper surface of the tip portion of each comb tooth 13 is formed with an inclined surface 15 that gradually descends toward the tip of the comb tooth. Since the inclined surface 15 is formed by pressing after providing the above-described coating film, a coating film also exists on the surface of the inclined surface 15. The coating film should just be provided in the inclined surface 15 of the 3rd spacer 8, and may be both surfaces of the 3rd spacer 8, and only an upper surface may be sufficient as it. Coloring may be performed on the surface of the bent portion of the rear portion of the third spacer 8, but may be performed on both surfaces or the entire upper surface of the third spacer 8. As shown in FIG.1 and FIG.2, the front-end | tip of the comb tooth of a 3rd spacer protrudes to the position ahead of the blade edge of a 4th blade, and behind the blade edge of a 3rd blade. Therefore, the inclined surface 15 is exposed between the cutting edge of the third blade 3 and the cutting edge of the fourth blade 4. In order to increase the exposed area of the inclined surface 15, the span S between the third blade and the fourth blade is approximately 1.32 mm, which is larger than the span between the other blade edges. Thereby, an antibacterial action is made by the antibacterial agent contained in the coating film. The spacer may be formed of a material having an antibacterial action without providing a coating film containing the antibacterial agent, or the entire spacer may be formed of a plastic containing the antibacterial agent. Moreover, you may provide a smoother in the front-end | tip part of a comb tooth. The smoother is preferably a mixture of polyethylene oxide and polypropylene or polystyrene mixed with vitamin E, an aloe component, a plant extract, a beard softener, and the like. The smoother may be soap. It can be said that this smoother has a finishing shave assist function just before the blade for finishing shave. In addition, the smoother is provided in addition to this. In FIG. 2, reference numeral 16 is a leading smoother, reference numerals 17 and 17 are side smoothers, and reference numeral 18 is a subsequent smoother. Reference numeral 19 denotes a concave portion for storing a smoother that has melted during use. It is optional to provide these smoothers.

  As described above, the surface of the bent portion of the rear part of the third spacer 8 is colored with a color different from that of the blade base 20. FIG. 4 shows a state where the replaceable blade 5 is stored in the storage portion 23 of the replaceable blade case 22. As is apparent from the figure, the replaceable blade 5 is stored upside down, and is stored in an oblique state so that the rear end surface 24 of the replaceable blade rises. Therefore, the rear end face 24 of the replacement blade can be seen when the stored replacement blade 5 is viewed from above. As described above, since the surface of the bent portion of the third spacer 8 is colored, this coloring can be visually observed when the replaceable blade 5 accommodated is viewed from above. Thereby, the front and back of the replaceable blade 5 become clear at a glance. When the stored replaceable blade 5 is attached to the razor holder, the replaceable blade mounting device at the tip of the holder is directed to the bottom surface of the replaceable blade 5 to join the replaceable blade and lift the replaceable blade 5 from the storage portion 23. At that time, if the front / rear relationship of the replaceable blade to the holder is not matched, the replaceable blade cannot be attached. Therefore, the fact that the front and rear of the replaceable blade is clear at a glance is very easy for the user. It is easy to handle.

The exposure value is defined as the vertical distance from the common tangent line 11 connecting the top plate 21 and the surface of the guard part 10 to the measured cutting edge. FIG. 1 shows a replaceable blade having four blades, the exposure value A of the first blade is a negative value of −0.09 mm, and the exposure value B of the second blade is also a negative value. And -0.01 mm. The exposure value C of the third blade is positive and +0.03 mm, and the exposure value D of the fourth blade is negative and −0.04 mm. That is, the relationship between the exposure values of the adjacent third blade and the fourth blade is C> D, and the relationship between the exposure values from the first blade to the third blade is A <B <C, It is. However, it goes without saying that the present invention is not limited to these numerical values . Although the exposure value B of the second blade is negative, it may be positive or zero. Moreover, the exposure value of all the blades may be a value of zero or more, or may be a negative value. Only the exposure value A may be negative and the other exposure values may be positive. The exposure value A and the exposure value D may be negative, and the exposure value B and the exposure value C may be positive. When the exposure value A of the first blade and the exposure value B of the second blade are negative, including other exposure values having negative values, the exposure value A of the first blade is Although the exposure value B of the second blade is the minimum and the maximum, the present invention is not limited to this. When the exposure value is a negative value, the smaller exposure value is defined as the larger exposure value than the larger exposure value.

FIG. 5 is a reference diagram in the case of using an exposure value that is substantially the same as that of the present invention, but is different from the exposure value defined in the present invention. Therefore, FIG. 5 is not a diagram for directly explaining the present invention. The configuration of FIG. 5 includes first, second, third, and fourth elements in which the cutting edge is retracted in order from the side closer to the guard part, arranged between the guard part, the top board, and the guard part and the top board. When the vertical distance from the common tangent line connecting each skin contact surface of the adjacent members to the front and rear of the blade edge to be measured is the individual exposure value that is the exposure value in the blade individual conditions The individual exposure values of the first blade and the fourth blade are negative values, the individual exposure value of the third blade is a positive value, and the individual exposure value of the second blade is the individual exposure value of the first blade. Greater than the value and less than the individual exposure value of the third blade. As shown in FIG. 5, the individual exposure value E of the first blade 1 is a vertical distance from a common tangent line connecting the surface of the guard portion 10 and the blade edge of the second blade 2 to the blade edge of the first blade 1. -0.08 mm. The individual exposure value F of the second blade 2 is a vertical distance from the common tangent line connecting the blade edge of the first blade 1 and the blade edge of the third blade 3 to the blade edge of the second blade 2 and is zero. The individual exposure value G of the third blade 3 is a vertical distance from a common tangent line connecting the blade edge of the second blade 2 and the blade edge of the fourth blade 4 to the blade edge of the third blade 3 and is +0.06 mm. is there. The individual exposure value H of the fourth blade 4 is a vertical distance from a common tangent line connecting the blade edge of the third blade 3 and the surface of the top plate 21 to the blade edge of the fourth blade 4 and is −0.05 mm. .

  Further, as shown in FIG. 5, the blade thicknesses of the first blade 1, the second blade 2, and the third blade 3 are all equal, and the blade thickness of the fourth blade 4 is smaller than those. Although the blade thickness of the blade with the smaller blade thickness is 0.08 mm, it may be about 0.05 mm to 0.25 mm. Although the blade thickness of the blade having the larger blade thickness is 0.1 mm, it may be 0.09 mm to 0.5 mm. However, the blade thickness is not limited to this value.

Cross section of the present invention Perspective view of the present invention Plan view and side view of third spacer Sectional drawing which shows the state which stored the replaceable blade in the replaceable blade case Reference cross-sectional view when using exposure values measured differently from the exposure values defined in the present invention

DESCRIPTION OF SYMBOLS 1 1st blade 2 2nd blade 3 3rd blade 4 4th blade 5 Replacement blade 6 1st spacer 7 2nd spacer 8 3rd spacer 9 Pin 10 Guard part 11 Common tangent 12 Rear end surface 13 of a turret Comb tooth 14 Inserting portion 15 Inclined surface 16 Leading smoother 17 Side smoother 18 Subsequent smoother 19 Recessed portion 20 Blade base 21 Top plate 22 Replacement blade case 23 Storage portion 24 Rear end surface of replacement blade

Claims (8)

A blade that has three or more blades, and that is close to the guard portion with two adjacent blades when the vertical distance from the common tangent line connecting the guard portion and the top plate to the blade edge is the exposure value of the blade Is larger than the exposure value of the blade behind the blade, and there is at least one blade in front of the blade closer to the guard portion, and the blade closer to the guard portion and the blade The exposure value of a group of blades including all the blades existing in the front is larger in the exposure value of the blade behind the blade than the front blade , and the blades other than the blade closest to the top plate A safety razor characterized by a group of blades . There are first, second, third and fourth blades whose blade edges retreat in order from the side closer to the guard part, and the exposure values of the first and fourth blades are negative values. The safety razor according to claim 1 , wherein the exposure value is a positive value, and the exposure value of the second blade is larger than the exposure value of the first blade and smaller than the exposure value of the third blade. The safety razor according to claim 2, wherein the exposure value of the second blade is a negative value. When the exposure value of at least a first blade and the second blade has a negative exposure value of the blade having a negative value, according to claim 3, wherein the second blade in the first blade minimum is the largest Safety razor. Exposure value for each blade, the first blade -0.09Mm, second blade -0.01Mm, a third blade + 0.03 mm, wherein the fourth blade is -0.04mm Item 4. A safety razor according to item 4 . If the number of all blades is an even number, one of the half blades near the top plate, or if the number of all blades is an odd number, in the blade closer to the top plate than the center blade The safety razor according to claim 1 , wherein any one of the blades is formed to have a blade thickness smaller than all the other blades, and the blade thicknesses of all the other blades are all equal. Each blade is overlapped, and a spacer is arranged between each blade, and the spacer between the blade closest to the top plate and the blade adjacent to the front is formed in a comb shape, and the tip of the comb tooth of this comb spacer is The safety razor according to any one of claims 1 to 6, wherein the safety razor protrudes forward from a cutting edge of a blade closest to the top plate to a position behind a cutting edge of a blade adjacent to the front of the blade. A spacer is disposed between each blade, and the rear portion of the spacer disposed between the blade closest to the top plate and the blade adjacent to the front of the blade protrudes from the rear end surface of the blade base and is bent downward. The safety razor according to any one of claims 1 to 7 , wherein at least a bent rear surface portion of the spacer is colored in a color different from the color of the blade base.

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