JPS602067B2 - Inner blade of reciprocating electric razor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inner cutter body for a reciprocating electric shaver, which is made up of a plurality of inner cutter blades each having an arc-shaped cutting edge and fixed by a supporting member, and prevents damage to the outer cutter. The purpose of the present invention is to provide an inner blade body for a reciprocating electric shaver that can prevent the above-mentioned problems, and can grind the cutting edge with high accuracy and efficiency, and has high quality after grinding, such as surface roughness and grinding returns. do.

In general, this kind of inner blade body is a horizontal body with a plurality of inner blades, each base of which is integrally fixed with a support member made of aluminium, zinc die-cast, synthetic resin, pipe, etc. Because the entire circumference of the cutting edge of the inner cutter is exposed, the high-speed reciprocating movement of the inner cutter and the deflection of the outer cutter during use cause the cutting edge to become thinner, especially at the edges on both lower edges. There was a risk that the outer blade of the blade could get caught and be damaged.

For this purpose, a structure was developed in which the outer edges of the inner blade were covered with synthetic resin (e.g. Tokkan Sho 46-59
As shown in Japanese Patent No. 37) and FIG. 3, a structure in which the back frame portion 52 of the support portion 51 of the inner blade body 50 is expanded and molded to the cutting edge line 53 has already been provided. However, in such a device, the frame-shaped portion 52 of the inner cutter body 50 prevents the outer cutter from moving when reciprocating.
4, the outer cutter 54 is extended in an arched shape, and the frame-shaped portion 52 of the inner cutter body 50, as shown in FIG. During this process, the escape space for the hair shoulder was destroyed, which caused the hair shoulder to blow out from the outer cutter hole.

In this way, the expanded frame-shaped portion for protecting the outer blade and the escape space for hair debris are contradictory to each other.

In addition, in this case, the enlarged portion of the frame portion 52 becomes larger in mass, resulting in loss of reciprocating power. Moreover, when polishing the arc-shaped cutting edge, for example, 1
The machine body to be polished, which is made up of a pair of inner blade bodies 50 and a rear frame part 52 assembled into a cylindrical shape, is accurately positioned and held with respect to a rotary whetstone using a fixing jig, and while the above-mentioned vulgarity is rocked or rotated. It is customary to polish the cutting edge of the structure by applying it to a rotating grindstone.

However, in the inner blade body 50, the edge portion 55 is connected to the frame portion 5.
2 is protruded so that it is covered flush with the grinding wheel, so during polishing, not only the inner cutter blade but also the entire side surface 56 of the frame portion 52 (see Figure 3) is covered with the grinding wheel. As a result, the material of the frame portion 52, for example, synthetic resin, not only clogs the grindstone and reduces polishing efficiency, but also causes grinding warpage due to the difference in hardness between the inner cutter blade and the frame portion 52. Furthermore, since the inner cutter assembled into a cylindrical shape does not rotate smoothly, it is difficult to achieve a uniform surface roughness, resulting in a decrease in quality after polishing.

This invention was made in consideration of these circumstances,
A plurality of inner cutter blades with arc-shaped cutting edges are held together by multiple support members.

At the same time, both ends of each of the supporting members are interconnected by a reinforcing plate part to form an inner cutter transporting body. "And a protrusion is formed so that the distal end face faces substantially flush with the same circumferential surface as the distal end surface of the arcuate cutting edge." By setting the inner blade of the reciprocating electric razor across the upper and lower areas in relation to an imaginary straight line parallel to the lower end surface of the small blade, it is possible to prevent damage to the outer blade while maintaining a space for hair release. This invention makes possible the contradictory objectives.Embodiments of this invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the inner cutter body of the present invention, and 1, j, 12...ln are a plurality of inner cutter blades each having an arc-shaped cutting edge portion la, and each inner cutter cutter has a circular cutting edge portion la. They are arranged in parallel with each other at predetermined intervals, and are supported and fixed in a skewered manner to a plurality of (three in this embodiment) support members 2, such as pipes, and furthermore, the support members 2 are arranged in parallel with each other at predetermined intervals. In order to maintain their positions, they are each connected and fixed by a substantially semi-disc-shaped reinforcing slope portion 3.

Of course, this reinforcing plate portion 3 is formed to have a diameter smaller than that of the inner cutter so as not to prevent exposure of the cutting edge portion la of the inner cutter.

The inner cutter blade 1, the support part village 2 and the reinforcing plate part 3 form the inner cutter 4.
・Constitutes the Hadatsudan body 4. 5, 5 is the above inner blade 4.
These are protrusions provided at both circumferential ends of the reinforcing plate portion 3, respectively, so as to correspond to both circumferential edge portions of the blade length.

The protrusions 5, 5 are protruded so that their respective tip surfaces 5a are substantially flush with the same circumferential surface Q as the end surface lb of the cutting edge portion la, as shown in FIG. With respect to the imaginary straight line 1 that passes through the center 0 of the circumferential surface Q and is parallel to the lower end surface lc of the inner cutter 4 and the cutter 1, it is set across the upper and lower regions.

As is clear from the above configuration, both peripheral edge portions of the inner cutter 4 and the blade 1 are made to correspond to each other, so that the tip surface 5a of the reinforcing plate portion 3 is aligned with the same circumferential surface Q as the end surface lb of the cutting edge portion la. Since the protrusion 5 is formed so as to be substantially flush with each other, the deformation of the outer cutter during use is forcibly followed by the protrusion 5, and the circumferential edge of each of the inner cutter blades 1 continuous with the protrusion 5 is formed. This prevents the edge portion from hitting the outer cutter in a hooked manner, thereby preventing damage to the outer cutter.

In particular, since the protrusions 5 are located on both end sides of the inner cutter blade extension body 4, there are no more protrusions than necessary on the loose body 4, and there is no hair between the outer cutter and the circumferential edge of the machine body 4. An escape space is provided for removing the burr, and it is possible to prevent hair from blowing out from the outer cutter.In addition, each of the protrusions 5 is connected to the center ○ of the circumferential surface Q and the end face of the inner cutter blade 1. Since it is set across the upper and lower areas with respect to the imaginary straight line 1 parallel to lc, there is no need to assemble two inner blade small blade Renseki bodies 4 as in the conventional case.
The tip 5a of the protrusion 5 and the tip surface lb of the tip la
As a result, a perfectly circular polished surface is formed, making it possible to easily and highly accurately polish the cutting edge portion la.

As described above, the present invention provides a structure in which the reinforcing plate portions located at both ends of the horizontal body connected to the inner cutter blades are provided with t-shaped parts that correspond to both circumferential edge portions of the inner cutter blades, and whose tip surfaces are in the same circle as the blade tip surface. By forming a protrusion that faces substantially flush with the circumferential surface, it is possible to give the horizontal body an action of pushing the outer cutter and forcing the outer cutter to follow the pattern, thereby preventing damage to the outer cutter. By providing an escape space for hair removal in areas other than the protrusion formation position, it is possible to prevent hair debris from blowing out, and since there is no need to form the protrusion formation position unnecessarily, the weight of the inner blade can be reduced. Not only can the loss of reciprocating driving force be reduced, but also the protrusion can be arranged parallel to the lower end surface of the inner cutter blade and in the upper and lower regions with respect to the imaginary straight line passing through the center of the circumferential surface. Since the inner blades are formed so as to span over each other, it is possible to provide an inner blade body of a reciprocating electric shaver, which can be used for highly efficient sharpening with the horizontal body connected to the inner cutter blades as it is.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the inner cutter body of the reciprocating electric shaver according to the present invention, Fig. 2 is an explanatory view of the same main part, Fig. 3 is a perspective view of a conventional inner cutter body, and Fig. 4 is a bottom view showing the relationship with the conventional outer cutter. 1... Inner cutter blade, la... Arc-shaped cutting edge,
lb...Blade tip surface, lc...Lower end surface,
2...Supporting member, 3...Reinforcement plate part, 4
...Inner blade small blade Renseki body, 5...Protrusion part, 5
a...Tip surface, 1...Virtual straight line, 0...
・Center, Q... Circumferential surface. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A plurality of inner cutter blades 1 having an arc-shaped cutting edge portion 1a are connected and fixed by a plurality of support members 2, and
Both ends of each of the supporting members 2 are interconnected by a reinforcing plate part 3 to form an inner cutter connecting structure 4, and the reinforcing plate part 3 corresponds to both peripheral edge parts of the inner cutter blade 1, and tip surface 5
A is formed with protrusions 5 which make it face substantially flush with the same circumferential surface Q as the blade tip surface 1b of the arc-shaped cutting edge portion 1a, and these protrusions 5 pass through the center O of the circumferential surface Q, respectively. , and with respect to the imaginary straight line 1 parallel to the lower end surface 1c of the inner cutter blade 1,
The inner blade of a reciprocating electric razor is set across the upper and lower regions.