JPS637793B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inner blade of a reciprocating electric shaver.

The blade portion of a conventional reciprocating electric shaver is shown in FIGS. 1 to 3. In other words, this blade part is
An outer cutter frame 1 supports an outer cutter 2, and an inner cutter body 3 is slidably and elastically contacted to the back surface of the outer cutter 2. The inner cutter body 3 has a large number of semicircular inner cutter blades 4 arranged side by side, and these are connected to each other by a central holder 5 made of resin and both end holders 6, 7, and the holders 5, 6,
Reinforcing ribs 8 are bridged between the inner blades 7 to provide the strength of the inner blade 4. Reference numeral 9 denotes a protrusion protruding outward from the outer surface of the both end holders 6 and 7, which makes the inner cutter blade 4 whose inner cutter forming angle θ ₀ is 180 degrees or less substantially 180 degrees and other than its peripheral edge 10 . This avoids damage caused by contact with objects (outer cutters, human hands, etc.) and enables centerless grinding.

However, the reinforcing ribs 9
During shaving, the beard debris cut by the inner blade 4 does not fall into the beard debris reservoir, but accumulates on the upper surface of the rib 8, and the slight vibrations of the razor body remove the beard debris. There was a defect in that the particles swung and flew out of the holes in the outer blade 2, staining shirts, clothes, washrooms, etc.

In order to solve these problems, it has been proposed to provide a gap in the blade thickness direction between the inner blade body and a semicircular reinforcing member (Japanese Utility Model Publication No. 1183/1983).

However, due to limitations on the maximum distance between the inner blades and the strength of the reinforcing member, the distance in the blade thickness direction cannot be made very large. Therefore, a sufficient effect of preventing whiskers from falling cannot be obtained only with the gap in the blade thickness direction. If there is a gap in the blade thickness direction, air will flow as the inner blade reciprocates, but since the gap in the blade thickness direction is along the reciprocating direction of the inner blade, the size of the gap will vary. There is little wind circulation in the ratio of . Therefore, even if this gap is caused to fall, a sufficient effect of preventing the hair from falling cannot be obtained, and the hair remains on the reinforcing member and scatters from the outer cutter.

An object of the present invention is to provide an inner blade for a reciprocating electric shaver that can sufficiently reduce the scattering of beard debris.

The inner cutter body of the reciprocating electric shaver of the present invention includes a substantially semicircular inner cutter blade, a plurality of holders that connect and hold a plurality of the inner cutter blades arranged in parallel, and a mutual interval between the inner cutter blades. and a reinforcing member configured to have a substantially semicircular diameter having a width narrower than that and an outer diameter smaller than the inner diameter of the inner cutter blade, and arranged in the middle between the adjacent inner cutter blades to connect the holder. It is something that

According to this configuration, in addition to the gap in the blade thickness direction, a gap in the radial direction is formed between the reinforcing member and the inner blade body.

Therefore, under restrictions such as strength, a large overall distance can be obtained. Moreover, since the gap in the radial direction faces the reciprocating direction of the inner blade, there is a large amount of air flow relative to the size of the gap. Therefore,
Mustache fall is guaranteed.

Embodiment An embodiment of the present invention is shown in FIGS. 4 to 7. In the inner cutter body of this reciprocating electric shaver, the width h of the substantially semicircular reinforcing rib 11, which is a reinforcing member, is set to H>
As h, a distance x ₁ is formed in the blade thickness direction, and the sixth
As shown in the figure, the outer dimension of the upper surface of the reinforcing rib 11 is made smaller than the inner diameter dimension of the lower surface 12 of the inner cutter blade 4 to form a radial distance x ₂ , and a pair of both end holders 6 and 7 The distance L between the protrusions 13, 13' of the holding bodies 6, 7 is set to L ₀ > L (L/L ₀ ≒ 1.0 to 0.6, L = 40 mm) with respect to the total length L ₀ of the holding bodies 6, 7. It also protrudes below the lower surface 14 of the blade 7 so that the inner cutter forming angle θ is substantially 180 degrees. The rest is the same as the example shown in FIG.

The distance between x ₁ and x ₂ must be equal to or greater than the thickness of the beard (approximately 0.2 mm).

According to this configuration, even if hair chips fall onto the upper surface of the reinforcing rib 11, due to the reciprocating vibration of the inner blade body, they fall from the gap x ₁ in the blade pressure direction and the gap x ₂ in the radial direction to the lower hair waste reservoir. do.

In this case, in addition to the gap x ₁ in the blade thickness direction, the gap x ₂ in the radial direction is formed, so the inner blade 4
Under restrictions such as the maximum distance between the two and the strength of the reinforcing ribs 11, a large overall distance can be obtained. Moreover, since the radial gap x ₂ is the gap that faces the reciprocating direction of the inner blade, there is a large amount of air flow relative to the size of the gap. Therefore, the fall of the beard is ensured, and the scattering of beard debris from the outer cutter 2 is prevented.

In this way, the beard debris is less likely to clog the inner cutter blade 9, the holders 5, 6, 7, and the reinforcing ribs 11, so the beard debris can be washed away in a short time by washing with water. In addition, it is difficult for beard debris to become clogged between the inner blades 4 and cause no problem in introducing the beard, so that a good shave can be maintained. Furthermore, since the reinforcing ribs 11 have a substantially semicircular diameter, they are less likely to be clogged with beard debris, resulting in even better shaving quality.

In addition, in order to perform centerless grinding of the inner blade body, the seventh
As shown in the figure, when the pair of inner cutters A and B are placed back to back, the lower surfaces of the protrusions 13 and 13' meet each other and form a perfect circle, so there is a gap between the lower surfaces of both end holders 6 and 7. It is possible to absorb warpages P ₁ and P ₂ that occur, and the workpiece receiver 14 supports the grinding wheel 15 and adjustment wheel 1.
6 and rotate the grinding wheel 15 to grind the outer circumferential surfaces of the inner cutter bodies A and B, even if the inner cutter forming angle θ of the inner cutter blade 4 is 180 degrees or less, the true Accuracy with respect to circularity, waviness, etc. is ensured.

As described above, in the inner cutter body of the reciprocating electric shaver of the present invention, the reinforcing member connecting the plurality of holders connecting the inner cutter blades has a width narrower than the mutual spacing between the inner cutter blades. The inner blade has a substantially semicircular shape with an outer diameter smaller than the inner diameter of the inner blade. Further, the reinforcing member is disposed between adjacent inner blades. Therefore, a gap in the radial direction is formed between the reinforcing member and the inner blade body in addition to a gap in the blade thickness direction, and under restrictions such as strength,
〓You can get a large amount of space overall. Moreover, radial direction
Since the gap faces the reciprocating direction of the inner blade, there is a large amount of air flow relative to the size of the gap.
Therefore, it is possible to ensure that the beard falls off, and there is an effect that the performance of preventing scattering of beard debris is good.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a conventional electric shaver, Fig. 2 is a plan view of its inner blade, Fig. 3 is a sectional view taken along the line -- in Fig. 2, and Fig. 4 is a portion of an embodiment of the present invention. 5 is a plan view of the inner cutter body, FIG. 6 is a sectional view taken along the line ``--'', and FIG. 7 is a sectional view showing a state of centerless grinding. 4...Inner blade, 11...Reinforcement rib (reinforcement member), 12...Bottom surface, 13, 13'...Protrusion,
x ₁ , x ₂ ...〓 between, h ... width of reinforcing rib.

Claims (1)

[Claims] 1. A substantially semicircular inner blade, a plurality of holders that connect and hold a plurality of the inner blades, and a width narrower than the interval between the inner blades, and a plurality of holders that connect and hold the inner blades. An inner cutter body of a reciprocating electric shaver, comprising: a reinforcing member configured to have a substantially semicircular diameter having an outer diameter smaller than an inner diameter and arranged between the adjacent inner cutter blades to connect the holding body.