JPS6324710B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a rotary electric shaver in which an inner cutter is in rotational sliding contact with the inner surface of an outer cutter, or a reciprocating electric shaver in which an inner cutter is in reciprocating sliding contact with the inner surface of an outer cutter. Regarding the structure of the blade.

[Background technology]

Electric razors are equipped with elongated hair introduction holes on the outer blade to reliably cut long beards that have been growing for several days or fallen beards, as well as on the inner surface of the outer blade to prevent deformation of the outer blade crosspiece. Some have a comb attached.
One such device is disclosed in Japanese Utility Model Application Publication No. 58-157461.

However, as shown in FIG. 20, in such a conventional electric shaver, the outer cutter frame 5 only rests on the comb 4a, and the comb 4a and the outer cutter 2
Positioning is not performed. For this reason, during use, the outer cutter 2 tends to shift in the direction of rotation of the inner cutter or in the direction of movement of the electric shaver, and in places where the outer cutter 2 shifts in the direction of rotation of the inner cutter, the comb 4a introduces hairs as shown in Fig. 20. Hole 18 (blade hole 1) is closed,
The groove width of the whisker introduction hole 18, which was originally set to _B1 , is
There was a problem that it became narrower as B ₂ , making it difficult to introduce the mustache hole. In addition, in the case of such a conventional example, the outer blade crosspiece 5
Since the cutting blade edges 7 on both sides of the electric razor were exposed, the hair holes were caught on the cutting blade edges 7 in the areas where the inner blade did not make sliding contact, and as the electric razor moved, the hair holes were pulled and stretched. It has the disadvantage of irritating the skin.

[Purpose of the invention]

The present invention was made in view of the above-mentioned technical background, and its purpose is to prevent the outer cutter from shifting by fixing the outer cutter to the comb, and to prevent the outer cutter from shifting into the cutter hole. To smoothly introduce whiskers and to ensure the positioning of a comb during assembly.

[Disclosure of the invention]

The electric shaver blade of the present invention has an outer cutter 2 having a large number of cutter holes 1, inner cutters 3a and 3b that are in sliding contact with a part of the inner surface of the outer cutter 2, and inner cutters 3a and 3b on the inner surface of the outer cutter 2. In an electric shaver blade having a comb 4 disposed in a portion that does not touch the blade, a recess 6 is formed on the inner surface of the outer cutter crosspiece 5 disposed between the blade holes 1 of the outer cutter 2, and the comb 4 is inserted into the recess. By fitting the comb 4 into the recess 6 in this way, the outer cutter crosspiece 5 can be fixed to the comb 4, and the outer cutter crosspiece 5 can be fixed to the comb 4. Changes in the groove width of the hair introduction hole due to positional deviation can be prevented, and on the other hand, the comb 4 can be reliably positioned on the outer cutter 2 when assembling the outer cutter block.

Embodiments of the present invention will be described in detail below with reference to the attached drawings showing a rotary electric shaver. Figure 2 shows the blade of an electric razor. It consists of an outer cutter block 8 and an inner cutter block 9. The outer cutter block 8 is attached to the upper end of the razor main body (not shown) which has a built-in motor (not shown), etc., and the inner cutter block 9 is attached to the shaft of the motor. The outer cutter block 8 has a comb 4 made of synthetic resin integrally molded on the upper end of a cylindrical outer cutter frame 10 that is screwed onto the razor body.As shown in FIG. A substantially hat-shaped peripheral edge of the outer cutter 2 is placed on the upper end, and a flange 11 at the lower edge of the outer cutter 2 is attached to the outer cutter frame 10 by a ring 12 attached to the outer periphery of the outer cutter frame 10.
Fixed. As shown in FIG. 17, the inner cutter block 9 has a disc-shaped inner cutter frame 1 made of synthetic resin.
Three inner cutters 3a on the inner circumference side and six inner cutters 3b on the outer circumference side are inserted into the hole 14 of No. 3 so as to be vertically movable, and as shown in FIG. It is elastically biased upward by a push-up spring 15 attached to the lower surface of the blade frame 13 by heat sealing. Further, on the outer peripheral wall of the inner cutter frame 13, 6
A protrusion 30 is provided at a location, an inner cutter 3b on the outer circumference side is provided on the upper surface of this protrusion 30, an inner cutter 3a on the inner circumference side is arranged on the inner circumference side of every other inner cutter 3b, Ribs 32 for scraping off soap are provided in the recesses 31 between the protrusions 30. The inner cutter frame 13 is injection molded from a material that is a mixture of synthetic resin and metal powder, and the weight of the metal powder increases the inertia of the inner cutter block 9, so that the inner cutter block 9 rotates evenly and uniformly. At the same time, it is not slowed down by the cutting resistance of the whiskers, and the cutting quality is improved. The amount of metal powder mixed is, for example, 30% to 60% when iron powder (#200 or less) is mixed with polyacetal resin. That is, if it is more than 60%, the heat sealability will be impaired, and if it is less than 30%, the inertial force will be insufficient. The outer cutter 2 is a thin metal plate with a large number of cutting holes 1. As shown in FIG. A three-dimensional slit portion 19 is formed in which a long hair introduction hole 18 is formed extending from the upper surface of the outer blade 2 to the outer peripheral side wall, and the net portion 17 and the three-dimensional slit portion 19
A concave bent strip 20 is provided between the two. Blade hole 1 consisting of round blade hole 16 and whisker introduction hole 18
As shown in FIGS. 5 and 6, the outer cutter bar 5 that separates the outer cutter bar 5 has an arcuate cross section.
A recess 6 is formed in the lower surface of the recess 6, and cutting edges 7 are formed on both side edges of the recess 6. Thus, the inner cutters 3a and 3b on the inner circumference side are in sliding contact with the inner surface of the net portion 17, the inner cutters 3a and 3b on the outer circumference side are in sliding contact with the inner surface of the three-dimensional slit portion 19, and the bent strip portion 20 is in sliding contact with the inner surface of the three-dimensional slit portion 19. The comb 4 is located between the inner cutter 3a and the inner cutter 3b on the outer circumference side, and the comb 4 is located on the outer circumference side than the inner cutter 3b on the outer circumference side.

FIG. 4 shows the structure of the three-dimensional slit portion 19. The comb 4 has an outer cutter 5 formed on the outer cutter 2.
A plurality of protrusions 21 are made to protrude upward at the same pitch, and the upper ends of these protrusions 21 are brought into contact with the lower surface of the outer cutter crosspiece 5 of the three-dimensional slit part 19, and the grooves between the protrusions 21 are 22 is aligned with the whisker introduction hole 18. Furthermore, as shown in FIGS. 7 and 8, a recess 6 of the outer cutter crosspiece 5 is provided on the upper surface of the protrusion 21.
A rib 23 is provided protruding in the same direction as (perpendicular to the rotational direction of the inner cutters 3a, 3b), and this rib 2
3 fits into the recess 6 of the outer cutter crosspiece 5 to position the comb 4 and the outer cutter 2 in the rotational direction of the inner cutters 3a, 3b. The comb 4 with the ribs 23 fitted into the recesses 6 is then heat welded, and the ribs 23 and their vicinity are melted to form the recesses 6.
At the same time, the cutting edge 7 of the outer cutter crosspiece 5 is buried in the upper surface of the comb 4, and the cutting edge 7 is covered by the comb 4, and the inner cutters 3a, 3b are filled as shown in FIG. This prevents whiskers from getting caught on the cutting edge 7 that does not make sliding contact with the outer cutter 2, thereby preventing irritation to the skin and preventing the outer cutter 2 from slipping.

This method of thermal welding is shown in FIGS. 9 to 12. That is, first, the outer cutter 2 is placed on the comb 4, the rib 23 is fitted into the recess 6 and aligned, and the ring 12 is temporarily press-fitted into the outer cutter frame 10 with the ring 12 slightly raised ( Figure 9). After that, the hot caulking punch 24 is lowered onto the outer cutter 2 to heat the comb 4 through the outer cutter 2 and press the outer cutter 2 against the comb 4, so that the rib 2
3 into the recess 6 (10th
figure). Then, when the flange 11 of the outer cutter 2 comes into contact with the upper end of the outer cutter frame 10, the ring 12 is press-fitted again to fix the flange 11 of the outer cutter 2 (FIG. 11). At this time, the resin protruding from the lower surface of the outer cutter crosspiece 5 covers the cutting edge 7. In order to cover the cutting edge 7 with the protruding resin 25 of the comb 4 during heat welding of the comb 4, the ninth
As shown in the figure, the height H ₁ of the comb 4 is made larger than the height H ₂ of the outer cutter 2 (H ₁ >H ₂ ) depending on the amount of resin protruding.

The one shown in FIG. 13 is another example of the present invention, and as shown in FIG. 14, the rib 23 is not provided on the upper surface of the protrusion 21 of the comb 4 before heat welding. The outer blade crosspiece 5 is placed on the comb 4 without this rib 23.
and heat the comb 4 from above the outer blade 2 with the hot caulking punch 24 in the same manner as above.
The melted resin of the comb 4 enters into the recess 6, and the comb 4 and the outer cutter 2 are fitted together, and the cutting edge 7 is covered with the protruding resin 25 that protrudes laterally.

The one shown in FIG. 15 is still another example of the present invention, in which a comb 4 is formed on the outer cutter 2 at the same time. That is, the upper surface opening of the cavity 27 for forming the comb 4 formed on the lower mold 26 is connected to the outer cutter crosspiece 5.
When the outer cutter 2 is sandwiched between the upper mold 28 and the lower mold 26 by closing it with the lower surface of the mold, and the resin 29 is injected into the cavity 27 from below, the resin 29 is filled into the recess 6 and the outer cutter crosspiece 5 is attached to the comb 4. It is positioned.

What is shown in FIGS. 16a and 16b is still another example of the present invention, in which the recess 6 on the lower surface of the outer cutter crosspiece 5 and the rib 23 on the upper surface of the comb 4 are mechanically fitted.

〔Effect of the invention〕

Since the present invention is configured as described above, since the comb fits into the recess of the outer cutter, the outer cutter does not shift from the comb. The blade hole is narrowed by protruding into the blade hole, which does not impede the introduction of the beard, and therefore has the advantage that even long beards or fallen beards can be reliably cut by introducing the beard. Furthermore, by fitting the comb into the recess of the outer cutter, the outer cutter and the comb can be easily positioned when the outer cutter block is assembled, and there is an advantage that assembly is easy.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a partially cutaway front view showing the entire blade of the electric shaver as above, Figure 3 is an enlarged view of the The figure is a partially broken perspective view of the outer cutter, Figure 6 is a YY sectional view of Figure 5, Figure 7 is a partially broken perspective view of the comb, and Figure 8 is a Z arrow view of Figure 7. Figures 9, 10 and 11 are cross-sectional views showing a method of thermally welding the comb to the recess of the outer cutter, Figure 12 is a PP cross-sectional view of Figure 10, and Figure 13 is a cross-sectional view of the present invention. 14 is a partially broken perspective view of the same comb before heat welding; FIG. 15 is a sectional view showing still another example of the present invention; FIGS. 17 is a front view of the inner cutter block, FIG. 18 is a bottom view of the same, FIG. 19 is an explanatory view of the operation of the present invention, and FIG. 20 is a sectional view of a conventional example. 1 is a blade hole, 2 is an outer cutter, 3 is an inner cutter, 4 is a comb, 5 is an outer cutter crosspiece, and 6 is a recess.

Claims (1)

[Scope of Claims] 1. An outer cutter having a large number of cutting holes, an inner cutter that makes sliding contact with a part of the inner surface of the outer cutter, and a comb that is arranged in a part of the inner surface of the outer cutter where the inner cutter does not make sliding contact. 1. An electric shaver blade comprising: a recess formed in the inner surface of the outer cutter crosspiece disposed between the cutter holes of the outer cutter, and a comb fitted into the recess. 2. The electric shaver blade according to claim 1, characterized in that the comb is thermally welded to the recessed portion of the outer cutter crosspiece and the comb covers the cutting edge formed on the outer cutter crosspiece. 3. The electric shaver blade according to claim 1, wherein the comb is provided on the side wall of the inner surface of the outer cutter, and the cut hole on the outer side of the outer cutter is formed across the side wall.