JPS6352911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) This invention relates to an improvement in the guide surface of a two-blade safety razor that comes into contact with the skin surface during shaving.

(Problems to be solved by conventional technology and invention) As a conventional two-blade safety razor, for example,
As shown in No. 130671, there is a blade in which upper and lower blade bodies are sandwiched between a blade stand and a top plate with a spacer interposed therebetween. With this two-blade safety razor, you can shave while your skin is in contact with the guide surfaces of the blade base and top plate, but because the distance between both guide surfaces is narrow, the shaving action becomes unstable. There was a fear that this would happen. Therefore, there is also a flat type razor (for example, Japanese Patent Publication No. 12307/1983) in which the distance between both guide surfaces is widened and the distance between the upper and lower blades is also widened. In this razor, as shown in FIG. 4, when the skin surface S is a curved surface, when shaving with the lower blade body 4, the lower guide surface 9 is applied to the skin surface S, but the upper guide surface 10 is Separate from surface S. Therefore, the razor is supported only by the lower guide surface 9, making it very unstable. Furthermore, when shaving with the lower blade body 4 and then shaving continuously with the upper blade body 5, the razor is supported only by the upper guide surface 10, which also makes it very unstable.

Structure of the Invention (Means for Solving the Problems) In view of this problem, the present invention provides a structure in which the lower blade body and the upper blade body are mounted on the blade support portion in a substantially parallel state, and the cutting edge of the lower blade body is placed upward. Each of the blades is fixed in a position forward of the cutting edge of the blade, and the blade supporting part has a position below the front of the cutting edge of the lower blade near the plane connecting the cutting edge of the lower blade and the cutting edge of the upper blade. a lower guide surface located on the side;
In addition to providing an upper guide surface located above and behind the cutting edge of the upper blade body, a central guide surface is provided between the cutting edges of both the upper and lower blade bodies, and the lower blade body The blade edge is provided so as not to protrude or at the same position, while the blade edge of the upper blade body is provided so as to protrude from the shaving tangent surface.

(Function) Therefore, in a continuous shaving operation from the lower blade to the upper blade, even if the skin surface is curved, the lower guide surface and the center guide surface or the center guide surface and the upper guide surface are At the same time, it comes into contact with the skin surface.
At that time, the cutting edge of the lower blade cuts slightly above the root of the beard for a rough shave, and the cutting edge of the upper blade cuts the rough shaved hair from the root to give a final shave. .

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. The blade support part 1 is detachably attached to a holder (not shown), and The lower blade body 4 is fixed by the clamping part 6 on the blade mounting surface 2 formed on the upper surface, and the upper blade body 5 is secured on the blade mounting surface 3 formed on the rear side of the upper surface. It is fixed by a fitting part 7. The lower blade body 4 and the upper blade body 5 are in a substantially parallel state, and the cutting edge 4a of the lower blade body is located in front of the cutting edge 5a of the upper blade body 5. Blade support part 1
In the figure, there is a lower guide surface 9 on the front wall 8 located below the front of the cutting edge 4a of the lower blade body 4 near the plane connecting the cutting edge 4a of the lower blade body 4 and the cutting edge 5a of the upper blade body 5.
In addition to providing the upper guide surface 10 on the clamping part 7 located rearward and upper side of the cutting edge 5a of the upper blade body 5, the clamping part 6 is provided between the blade edges 5a and 4a of the upper and lower blade bodies 5 and 4. An upper central guide surface 11 is provided. A plane connecting these guide surfaces 9, 10, 11 forms a shaving tangential plane P, and the upper and lower blade bodies 5, 4 are inclined with respect to this shaving tangential plane P. As shown in FIG. 3, the cutting edge 4a of the lower blade body 4 is slightly retracted backward from the shaving tangent plane P by a distance L1, and the cutting edge 5a of the upper blade body 5 is drawn forward from the shaving tangential plane P. It protrudes by a distance L2.
Therefore, assuming a plane A that passes through the cutting edge 4a of the lower blade body 4 and is parallel to the shaving tangent plane P, and a plane B that passes through the cutting edge 5a of the upper blade body 5 and is parallel to the shaving tangent plane P, The distance between both sides A and B is the distance L1 and L
It becomes the sum of 2. That is, when performing a shaving operation parallel to the shaving tangent plane P, the blade edge 5a of the upper blade body 5 is at the distance L compared to the blade edge 4a of the lower blade body 4.
It passes along the front in the horizontal direction including the blade bodies 4 and 5 by the sum of 1 and L2. Note that the cutting edge 4a of the lower blade body 4
may be located on the shaving contact surface P.
Note that in this specification, the distance refers to the distance between each blade body 4, 5.
The horizontal distance including

Now, in a continuous shaving operation from the lower blade body 4 to the upper blade body 5, even if the skin surface S is a curved surface as shown in FIG. 1, when shaving with the lower blade body 4, the lower blade guide The surface 9 and the central guide surface 11 come into contact with the skin surface S, and the blade support portion 1 is supported with good stability. Thereafter, as shown in FIG. 2, when shaving with the upper blade 5, the central guide surface 11 and the upper guide surface 10 come into contact with the skin surface S, and the blade support 1 is similarly supported with good stability. That is, in addition to the lower guide surface 9 and the upper guide surface 10, the cutting edges 5a, 4 of the upper and lower blade bodies 5, 4
Since there is a central guide surface 11 between a, the lower guide surface 9 and the central guide surface 11 or the central guide surface 11
and the upper guide surface 10 simultaneously contact the skin surface S,
This makes it possible to provide stability to the shaving action.

Furthermore, as described above, the cutting edge 4a of the lower blade body 4 is recessed with respect to the shaving tangent plane P, while the cutting edge 5a of the upper blade body 5 is protruding.
By arranging a and 5a in this way, it is possible to perform a rough shave with the lower blade body 4 and then finish shaving with the upper blade body 5, and the characteristics of the setting of each blade body 4 and 5 are fully brought out to shave the skin. Due to the synergistic effect with the flat type razor that makes surface contact with the surface S,
The shave becomes very soft.

Effects of the Invention As detailed above, according to the present invention, the guide surface 11 is also provided between the upper and lower blade bodies 5 and 4 of the double-blade safety razor, so even if the skin surface is curved, the blade body The support part 1 is supported with good safety, giving stability to the shaving operation and improving the taste of the shave. Further, by arranging the double-edged blades as described above, rough shaving and finishing shaving can be performed. Furthermore, due to the synergistic effect of the characteristics of the arrangement of the double blades and the fact that the blade support portion is supported by each guide surface, the shaving taste is extremely soft and the shaving operation is stable.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of the blade support section showing the positional relationship between each guide surface and the skin surface during shaving operation, and Figure 3 schematically shows the positional relationship between the cutting edges of the upper and lower blades. FIG. 4, a partially enlarged view, is a sectional view showing a conventional razor. Blade support part…1, lower blade body…4, blade edge…4a, upper blade body…5, blade edge…5a, lower guide surface…9, upper guide surface…10, center guide surface…11, shaving tangent surface… P.Skin side...S.

Claims (1)

[Claims] 1. Place the lower blade 4 and the upper blade 5 in a substantially parallel state on the blade support 1, and the cutting edge 4a of the lower blade 4 is aligned with the upper blade 5.
The blade edge 4a of the lower blade body 4 is fixed in a state in front of the blade edge 5a of the lower blade body 4.
A lower guide surface 9 located on the lower front side of the cutting edge 4a of the lower blade body 4 and an upper part located on the rear upper side of the cutting edge 5a of the upper blade body 5 near the top of the plane connecting the blade edge 5a of the upper blade body 5. In addition to providing the guide surface 10,
A central guide surface 11 is provided between the cutting edges 5a, 4a of the upper and lower blade bodies 5, 4, and each guide surface 9, 10, 1
1, the cutting edge 4a of the lower blade body 4 is provided so as not to protrude or at the same position as the shaving tangent plane P connecting
On the other hand, the shaving guide structure for a two-blade safety razor is characterized in that the cutting edge 5a of the upper blade body 5 is provided to protrude from the shaving tangential plane P.