JPS6232537Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a blade body for a safety razor in which guard wires are arranged in parallel in the extending direction of the blade edge at the cutting edge portion.

BACKGROUND ART Conventionally, as shown in FIG. 1, there has been a blade of this type in which a piano wire 27 serving as a guard wire is wound on one side so as to be perpendicular to the extending direction of the blade edge 28a. The resistance of the piano wire 27 prevents the blade from shifting laterally during use, thereby preventing damage to the skin surface.

On the other hand, the T-type razor was designed to perform a shaving operation by placing the blade against the skin surface and moving the blade in a vertical direction perpendicular to the blade tip. Therefore, the shaving motion is like stroking the unevenness of the skin surface in one direction, and it is difficult to shave off the beards on the skin surface from the root in one shaving motion, and many beards are left unshaved. Not only that, but because the blade is a so-called push cut, which cuts by pressing against the beard, it has the disadvantage of giving a bad shave.

Therefore, Jitsugan No. 57-199781 and Jitsugan No. 58-
As shown in No. 195235, by supporting the blade attachment part to the holder so that it can reciprocate in the direction in which the cutting edge of the blade extends, that is, in the direction that is inclined up and down with respect to the plane extending in the left and right direction, the shaving quality is improved. A razor has been developed that can improve the

By the way, when the blade body shown in FIG. 1 is used in such a razor, the intersection angle (90 degrees + θ) of the piano wire 27 with respect to the oblique direction B of the blade body is close to a right angle (the oblique angle θ is set to 10 When expressed in degrees, the intersection angle (90 degrees + θ) is 100 degrees), so the component force R perpendicular to the piano wire 27 increases, which increases the resistance against the skin surface during use, resulting in a poor shave. Ta.

Purpose The purpose of the present invention is to provide a blade body for a safety razor that can eliminate the above-mentioned drawbacks by devising the intersecting angle of the guard wire with respect to the extending direction of the blade edge.

Structure of the Invention In order to achieve this object, the present invention is such that the guard wires arranged in parallel with at least the surface of the cutting edge portion that contacts the skin surface are inclined with respect to the extending direction of the cutting edge.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In the blade bodies 12 and 14 shown in FIGS. 2 and 3, one piano wire 2 is used as a guard wire.
7 is wound between the locking recess 29 formed in the blade edge 28a of the blade edge part 28 and the back part 30, and the upper and lower surfaces 1
2a, 12b, 14a, 14b are arranged in parallel in the extending direction of the blade edge 28a, and the upper surfaces 12a, 14
Each piano wire 27 of a is inclined with respect to the extending direction of the blade edge 28a. (In this example, the inclination angle β
is assumed to be 10 degrees. ) Also, although the piano wires 27 on the lower surfaces 12b and 14b are inclined in the opposite direction to the piano wires 27 on the upper surfaces 12a and 14a, they may be made perpendicular to the extending direction of the blade edge 28a.

Next, as an application example of the blade bodies 12 and 14 configured in this way, an embodiment of a razor equipped with obliquely moving blade bodies will be described with reference to FIGS. 4 to 12. FIG. As shown, the holder 1 includes a dry cell storage cylinder 2,
A switch housing cylinder 3 is fixed to the upper end of this dry cell housing cylinder 2, a motor housing cylinder 4 is screwed to the upper end of this switch housing cylinder 3, and a motor housing cylinder 4 is screwed to the upper end of this motor housing cylinder 4. As shown in FIG. 5, an opening 5a is formed diagonally upward at the upper end of the front surface of the rail mounting part 5, and the rail mounting part 5 is formed opposite to the opening 5a.
A rail portion 6 having a U-shaped cross section as shown in FIG. 6 is fitted inside. Guide groove 6a in this rail part 6
As shown in Fig. 7, the direction B is inclined vertically with respect to the plane A extending in the left-right direction (the angle of inclination θ is approximately 10
degree) has been extended.

As shown in FIG. 5, the head 7 as a blade attachment part has a support member 8 shown in FIG.
A replaceable blade cartridge 9 is detachably supported with a fitting groove 9a on a guide rail 8a formed at the front end of the support member 8, and a guide block 10 formed at the rear of the support member 8 is attached to the rail portion 6. The guide groove 6a is fitted into the guide groove 6a. In this spare blade cartridge 9, a lower blade body 12 is placed on the blade stand 11,
The spacer 13 and the upper blade body 14 are sequentially overlapped,
These are the top plate 15 superimposed on the upper blade body 14.
and the blade base 11, and the lower blade body 12
A dregs removal plate 16 is interposed between the upper blade body 14 and the upper blade body 14. The blade edges 28a of the upper and lower blade bodies 14, 12 protrude very slightly from the shaving tangent plane P connecting the top of the top plate 15 and the guard 11a at the front end of the blade stand 11. The entire head 7 is the blade edge 28a of the blade body 14, 12 of the spare blade cartridge 9.
in the direction of extension, that is, in a direction that is vertically inclined with respect to the plane A extending in the left-right direction, and the shaving tangent plane P
It is supported on the rail portion 6 so as to be able to reciprocate in a substantially parallel direction B along the same direction.

As shown in FIG. 4, a motor 17 and a reduction gear head 18 are housed in the motor housing tube 4, and as shown in FIG.
A rotary shaft 19 of 8 is projected into the rail mounting portion 5 through the waterproof shield 20. A rotating member 21 having an eccentric shaft portion 22 is fixed to the rotating shaft 19, and the tip of the eccentric shaft portion 22 is connected to a notch portion 23 formed on the rear side of the rail portion 6, as shown in FIG. It is inserted into an engagement recess 24 formed on the rear side of the guide block 10 of the support member 8 through the support member 8 .

As shown in FIG. 4, a dry battery 25 is housed in the dry battery housing tube 2 by removing a lid 2a screwed onto the lower end thereof, and a switch 26 housed in the switch housing tube 3 is housed therein. The dry cell battery 25 and the motor 17 are electrically connected via the battery 25 and the motor 17. The motor 17, the reduction gear head 18, and the rotating member 21 constitute a driving device.

Now, as shown in Fig. 8, replaceable blade cartridge 9
When the motor 11 is rotated by applying it to the skin surface and turning on the switch 26, the decelerated rotation shaft 1
The rotating member 21 rotates via the shaft 9, and its eccentric shaft portion 22 swings. And, due to that oscillation, the 7th
As shown in the figure, the guide block 10 of the support member 8
moves back and forth along the guide groove 6a of the rail portion 6, and the blade bodies 12, 14 move obliquely in the above-mentioned inclination direction B, as shown in FIGS. 8 and 9. In this example,
The oblique angle θ is approximately 10 degrees, the reciprocating distance is approximately 2 mm,
The number of reciprocating strokes is approximately 2500 times per minute. The setting ranges for the skew angle, reciprocating distance, and reciprocating stroke number are 1 to 80 degrees and 1 to 10 degrees, respectively.
mm, about 100 to 5000 times. Furthermore, when the reciprocating distance is increased, the number of reciprocating strokes must be reduced for safety reasons.

In a conventional razor, as the blade is used to shave from top to bottom, the beard is pushed downward, and the blade works to bite into the root of the beard, creating a so-called push cut. However, at this time, it was common for unshaved areas to appear on the skin surface. Therefore,
I had to shave the same area over and over again. Therefore, a razor whose performance is further improved by applying slight vibrations to the blade body for pulling and cutting is being considered.

By the way, in pull-cutting, when the beard M is cut by the blade bodies 12 and 14 as shown in FIG. 10, the blade body 1 is
The cross sections of Nos. 2 and 14 are as shown in FIG. 11, and the cutting edge angle α2 of the cross section is always smaller than the cutting edge angle α1 during push-cutting shown in FIG. Therefore, the cutting edge angle α2 due to pulling becomes even sharper, and the effect is significant.

Normally, the cross section of whisker M generally has a short axis of 0.125 mm.
It has a circular shape with a major diameter of approximately 0.17 mm. Therefore, the first
As shown in FIG. 2, assuming that the cross section of the whisker M is circular with a diameter d, the required reciprocating distance S when the oblique angle is θ is (d×1/tan θ). Substituting d=0.17mm and θ=10 degrees into this equation, S=
It becomes 0.964mm. That is, in order to completely cut off the beard M under these conditions, the reciprocating distance S needs to be at least approximately 1 mm. Incidentally, if the skew angle θ is made larger than 10 degrees, S becomes smaller, but if θ is made too large, it is not preferable in terms of safety. Conversely, if θ is made smaller than 10 degrees,
It is necessary to increase S, but if θ is too small, the shaving quality will be poor.

For the above-mentioned reasons, if the blade vibrates only slightly as in the past, a sufficient cutting effect cannot be expected even if it is somewhat effective.

However, in this embodiment, since the blade bodies 12 and 14 have a sufficient reciprocating distance, even assuming various conditions, it is possible to reliably perform not only push-cut cutting but also pull-cut cutting, compared to the case of slight vibration. This will further improve the quality of your shave. It was considered that this reciprocating distance should be at least approximately 1 mm for the reasons mentioned above.

Moreover, the blade bodies 12 and 14 are connected to the top plate 15 and the blade base 11.
Since the blades 12 and 14 reciprocate in a substantially parallel direction B along the shaving tangential plane P that connects the blade to the guard 11a, the reciprocating movement prevents the blades 12 and 14 from digging into the skin surface excessively, improving safety. Improve even further.

Further, the guide groove 6a of the rail portion 6 is arranged in a direction that is inclined vertically with respect to the plane A extending in the extending direction of the blade edges 28a of the blade bodies 12 and 14 of the head 7, that is, in the left-right direction, and along the shaving tangent plane P. Since the blade is extended in the almost parallel direction B, the blade body 1 has a simple structure.
2 and 14 reciprocating movements in the left and right and up and down directions can be provided simultaneously. Regarding the reciprocating direction of the blades 12 and 14, unless the blades 12 and 14 protrude toward the skin surface from the shaving tangential surface P during their reciprocating movement, They do not need to be parallel, and may be reciprocated slightly backwards (in a direction away from the skin surface) with respect to the shaving tangential plane P as a reference.

Note that it is also possible to reciprocate only the blade mounting portion that supports the blade inside the head fixed to the holder, or to apply it to a single-blade safety razor.

The above is an application example of the blade bodies 12 and 14 shown in FIGS. 2 and 3. In particular, in this embodiment, the piano wires 27 parallel to the upper surfaces 12a and 14a of the blade edge portion 28 that contact the skin surface are Since the edge 28a is inclined at an inclination angle β with respect to the extending direction, as shown in FIG. 1
Compared to the conventional blade body shown in the figure, the inclination angle β of the piano wire 27 (in this example, β is 10 degrees, and the crossing angle is
110 degrees), and the component force R perpendicular to the piano wire 27 becomes smaller than in the conventional example. Therefore, the resistance against the skin surface is reduced and a good shave can be maintained.

In addition, in the above-mentioned embodiment, the piano wire 27 was wound to form a guard wire, but the comb tooth member was used as a guard wire at the cutting edge portion 28.
It is also possible to use each comb portion as a guard wire by fitting it into the wire.

Effects According to the present invention detailed above, especially when applied to a razor equipped with an oblique blade body, the resistance against the skin surface is reduced and a good shave quality can be maintained. .

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional blade body, Fig. 2 is a plan view showing a blade body according to an embodiment of the present invention, Fig. 3 is a sectional view thereof, and Figs. 4 to 12 are a plan view showing a blade body according to an embodiment of the present invention. An example of application of the blade body according to one embodiment is shown, FIG. 4 is a sectional view of the razor, FIG. 5 is a partial sectional view showing the head portion thereof, and FIG. Partially exploded perspective view showing the rotation member and the rotating member, seventh
The figure is a sectional view taken along the line X-X in Figure 5, Figures 8 and 9 are action explanatory diagrams showing the direction of reciprocating movement of the blade with respect to the tangential surface of the shaver, and Figure 10 is a drawing showing the pulling and cutting action of the blade. 11 is a cross-sectional view of the blade formed by the contact locus between the whisker and the blade, and FIG. 12 is an explanatory diagram showing the relationship between the reciprocating distance, the oblique angle, and the cross-sectional diameter of the whisker. be. Holder...1, Rail mounting part...5, Rail part...6, Head (blade body mounting part)...7, Guide block...10, Blade base...11, Guard...11
a. Lower blade body...12, Upper blade body...14, Top plate...
15, Motor...17, Reduction gear head...1
8, Rotating shaft...19, Rotating member...21, Eccentric shaft...22, Notch...23, Engagement recess...2
4, Dry battery...25, Switch...26, Piano wire (guard wire)...27, Blade tip...28, Blade edge...28a, Shaving tangent surface...P, Inclination angle...β, Component force ...R.

Claims (1)

[Claims for Utility Model Registration] 1. In a safety razor blade in which guard wires 27 are arranged in parallel in the extending direction of the blade edge 28a, the blade edge 2 contacts at least the skin surface.
A blade body for a safety razor characterized in that guard wire rods 27 arranged in parallel with surfaces 12a and 14a of No. 8 are inclined with respect to the extending direction of a blade edge 28a. 2. The blade body of the safety razor according to claim 1 of the utility model registration claim, wherein the guard wire 27 is a wound metal wire.