JPH0436793Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a replaceable blade safety razor that has a wider lower guide surface and a replaceable blade placed above to improve stability and shaving quality when shaving. It is related to.

(Prior Art) As shown in FIG. 6, a conventional replaceable blade safety razor has one or more replaceable blades between a lower guide surface 22 and an upper guide surface 23 provided on a cartridge case 21. 24 is arranged, the lower and upper guide surfaces 22 and 23 are directed toward the skin surface A, and the replaceable blade 24 is used to shave the beard.

However, in the conventional type, the length W' of the lower guide surface 22 is significantly shorter than the overall length W' of the cartridge case 21, and the replaceable blade 24 is arranged near the lower guide surface 22. Due to the reaction force applied to the replaceable blade 24 when shaving, the cartridge case 21 tends to rotate in the direction of the arrow, and the tangential plane B connecting the lower guide surface 22 and the upper guide surface 23 tends to separate from the skin surface A. shall be. Therefore, there was a problem that stability during shaving was poor, and the contact angle θ' of the replaceable blade 24 with respect to the skin surface A changed, resulting in poor shaving quality. Moreover,
Since the replaceable blade 24 is disposed near the narrow lower guide surface 22, there is also a problem in that it is not possible to easily shave under the nose, under the eyebrows, or in the recessed area.

In addition, some of the conventional safety razors with replaceable blades include
There is a method that attempts to control the effective exposure amount of the blade edge of a replaceable blade and the angle between the blade and the skin so as not to cause cuts as shown in Japanese Patent No. 55-141279. When the pressure applied to the skin from the disposable blade increases, for example by rotating the handle upwards relative to the disposable blade, the skin bulges in the span area between the blade edge of the disposable blade and the guard element (comb). Instead of a guard element having a curved engagement surface with a small radius of curvature that may injure the skin, the guard element has a skin engagement guide surface with a sufficient area and is placed sufficiently close to the blade edge to prevent the skin from getting into it. More preferably, the skin engagement control surface of the cap member (top plate) of the replaceable blade is provided on substantially the same plane as the guard element, so that the blade remains substantially constant even when the handle angle or the blade pressure changes. /Maintaining the contact angle with the skin improves the shave quality. however,
As explained earlier, if the replacement blade is not placed upward, the cartridge case will rotate outward due to the reaction force applied to the blade edge when shaving, and the tangential plane connecting the upper and lower guide surfaces will be at the skin surface. It cannot be said that the problem of stability and shaving quality deteriorated due to the contact angle changing as the blade tries to separate from the surface has not been solved.

(Problems to be Solved by the Invention) The present invention has been made in order to solve the above-mentioned problems.

(Means for Solving the Problems) The present invention provides a guide surface that is formed over the entire length of the cartridge case and is pressed against the skin surface, with the cutting edges of one or more replaceable blades facing the guide surface. In a replaceable blade safety razor, the surface is formed with a lower guide surface that is on the lower side with the cutting edge of the replaceable blade as a boundary, and an upper guide surface that is on the upper side of the same cutting edge,
The cutting edge of the one or more replaceable blades located between the lower guide surface and the upper guide surface is arranged at 2/3 or higher than the total length of the cartridge case, and the lower guide The upper guide surface is configured to be wider than the upper guide surface.

(Function) Since the above-mentioned method is adopted, when the cutting edge of the disposable blade receives a reaction force from the skin surface during shaving operations, the cartridge case uses the cutting edge of the disposable blade as a fulcrum to prevent the cartridge case from becoming unstable. This prevents the phenomenon of unintentional rotation.
The posture of the cartridge case pressed against the skin surface is stabilized in a state where the contact surface connecting the lower guide surface and the upper guide surface is in close contact with the skin surface, and the beard is shaved.

(Embodiment) A first embodiment of the present invention is shown in FIGS. 1 to 3. The cartridge case 1 includes a lower guide surface 2 and an upper guide surface 3, and a guide surface that is pressed against the skin surface is formed over the entire length W of the cartridge case 1. The lower guide surface 2 and the upper guide surface 3 are provided on the same tangential plane B. Further, a beard discharge port 4 is provided between both guide surfaces 2 and 3, and a replaceable blade 6 is attached to an inclined surface 5 opposite to the upper guide surface 3 so as to face the whisker discharge port 4.

As is clear from the figure, the cutting edge 6a of the replaceable blade 6 located between the lower guide surface 2 and the upper guide surface 3 is approximately 2/2/2 of the total length W of the cartridge case 1.
It is placed on the upper side at position 3. In other words,
The lower guide surface 2, which is on the lower side with the cutting edge 6a of the replaceable blade 6 as a boundary, has a length w that is approximately 2/3 of the total length W of the cartridge case 1, and
The replaceable blade 6 is arranged at the upper part of the cartridge case 1.

In the first embodiment, as shown in FIGS. 1 and 2, grooves 7 are provided at both ends of the upper part of the inclined surface 5 on the back surface of the cartridge case 1.
A fixing plate 8 is provided connected to this groove 7.
In addition, a cartridge case 1 is installed at both ends of the lower part of the inclined surface 5.
A positioning plate 9 is provided for positioning the replaceable blade 6 with respect to the blade. Both ends of the cutting edge 6a of the replaceable blade 6 are brought into contact with the positioning plate 9 for positioning, and with the ears 6b at both ends inserted into the respective grooves 7, the replaceable blade 6 is placed on the inclined surface of the cartridge case 1. 5
The replaceable blade 6 is fixed to the cartridge case 1 by heating the fixing plate 8, bending it into the groove 7, and pressing the ears 6b of the replaceable blade 6.

Then, as shown in FIG. 3, when shaving with the wide lower guide surface 2 facing the skin surface A, the replaceable blade 6 rotates when shaving because the lower guide surface 2 is wide. Even when subjected to force, the tangential surface B does not move away from the skin surface A, and the contact angle θ of the replaceable blade 6 with respect to the skin surface A remains approximately constant, allowing the user to shave in a stable state. Further, since the replaceable blade 6 is arranged at the upper part of the cartridge case 1, narrow areas such as under the nose and under the eyebrows can be easily shaved.

A second embodiment of the present invention is shown in FIG. 4, and this embodiment has two blades. The first replaceable blade 10 is fixed to the cartridge case 1 in the same manner as in the first embodiment. Second spare blade 1
1 is bent at an obtuse angle approximately at the center, and its fixed part 11a is fixed to the upper surface of the cartridge case 1, and its main body part 11b is inserted into the insertion groove of the cartridge case 1 so that the cutting edge is placed on the tangential plane B. It is located at

As shown in FIG. 5, a method for fixing the replaceable blade 6 is to provide curved portions 6c at both ends of the replaceable blade 6, and attach the curved portions 6c to the fixing portion 1 of the cartridge case 1.
Alternatively, if the replaceable blade is held down and fixed as in the above embodiment,
The blade edge portion may be fixed to control wobbling of the replaceable blade during shaving.

In addition, in the present invention, the position of the cutting edge of the replaceable blade is limited to 2/3 or above the total length of the cartridge case, if it is 2/3 or less,
This is because sufficient stability during shaving cannot be obtained due to insufficient contact width between the lower guide surface and the skin surface.

The ratio of the length of the lower guide surface to the total length of the guide surface formed over the entire length of the cartridge case is determined relatively by the size of the cartridge case, and the length of the cartridge case itself is small. If the contact width is too long, it is necessary to increase the ratio to ensure a predetermined contact width.

(Effects) (1) The lower guide surface is wide, and the replacement blade is placed above the cartridge case, so the cartridge case can be removed from the cartridge without the risk of inadvertent rotation due to reaction force during shaving. Shaving can be performed in a stable state in which the case has a stable posture in which the contact surface connecting the upper and lower guide surfaces of the cutting edge of the replaceable blade is in close contact with the skin surface.

(2) For the same reason, it is possible to shave comfortably without having to apply excessive pressure to the cartridge case against the skin, and the contact angle of the replaceable blade to the skin surface remains almost constant at all times, which prevents skin damage. There is almost no wear and tear on the cutting edge of the replaceable blade itself, which in turn extends the life of the replaceable blade.

(3) The lower guide surface is wide and the replacement blade is placed at the top of the cartridge case, making it easy to shave even in narrow or concave areas such as under the nose and eyebrows. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a replaceable blade safety razor according to the first embodiment of the present invention, FIG. 2 is a perspective view of the back side of the cartridge case 1, FIG. 3 is a view showing the state of use, The figure is a cross-sectional view of a replaceable blade safety razor according to the second embodiment of the present invention, FIG. 5A is a perspective view of another replaceable blade 6, and FIG. FIG. 6 is a sectional view of a conventional replaceable blade safety razor. Explanation of symbols of main parts, 1...Cartridge case, 2...Lower guide surface, 3...Upper guide surface, 4...Hair discharge port, 6...Replaceable blade, 6a...Blade tip of replaceable blade, 10 ...First spare blade, 11...Second spare blade, W...Full length of cartridge case.

Claims (1)

[Scope of utility model registration request] A guide surface formed over the entire length W of the cartridge case 1 and pressed against the skin surface has blade edges 6a of one or more replaceable blades 6 facing the guide surface, and the blade edge 6a of the replaceable blade 6 faces the guide surface. A replaceable blade safety razor is formed with a lower guide surface 2 that is on the lower side with the boundary being the boundary, and an upper guide surface 3 that is on the upper side of the cutting edge 6a, the lower guide surface 2 and the upper guide surface 3. The cutting edges 6a of the one or more replaceable blades 6 located between the cartridge case 1 are arranged at 2/3 or higher than the total length W of the cartridge case 1, so that the lower guide surface 2 is aligned with the upper part of the cartridge case 1. A replaceable blade safety razor characterized by being wider than the guide surface 3.