JPS6150587A - Inner blade of reciprocal electric razor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an inner cutter for a reciprocating electric shaver.

[Conventional technology]

Conventional techniques for 1iJF grinding of the outer peripheral cutting edge of this kind of inner cutter include 1, for example, as shown in Japanese Patent Application Laid-Open No. 58-46981 and Japanese Patent Application Laid-Open No. 58-103482, etc.
A cylindrical inner blade paper is constructed by twisting two identical inner blades together,
There is one in which the outer peripheral edge portion of the inner cutter 5 is polished by centerless polishing the inner cutter paper.

[Problem that the invention seeks to solve]

However, the inner cutter base, which holds a large number of inner cutter body bodies that make up the inner cutter in parallel, has been designed to be lighter (compared to a metal one), so that it can be Although it is molded from a plastic material for the purpose of reducing vibration noise and reducing costs, the inner blade base of this plastic material is susceptible to bending and deformation due to the load from the grindstone during centerless polishing. That is, in the above-mentioned conventional device, as shown in FIG. 8, the lower surface of the inner cutter base 3 of one of the inner cutters 1 and 1 that are overlapped with each other and the lower surface of the other inner cutter base 3 are both formed into flat surfaces. It's just a comparison.

Therefore, during centerless polishing, for example, the inner cutter bases 3 and 3 overlap each other as shown in FIGS. 8 and 9.
3 receives a force F in the direction of the arrow from the grindstones 16 and 17, and is relatively shifted in the front-rear direction A-B and deformed, and as a result,
The roundness of the inner blade component car body 2 was not achieved, which caused a decrease in sharpness.

Measures to solve problem C] In order to solve the above problems, this invention has the following features.

As shown in Figure 1, two inner blades 1 are used for centerless polishing.
・On the lower surfaces of the front and rear frames 4, 4 of the inner cutter bases 3, 3, which are butted against each other when the two are overlapped.

Displacement prevention means such as ribs 15 that engage with each other to prevent the inner cutter bases 3, 3 from shifting in the longitudinal direction are provided.

[Effect]

In such a case, the two inner cutters 1 and 1 are arranged vertically to form a cylindrical inner cutter set.

The front and rear frames 4 and 4 of the inner blade bases 3 and 3, which overlap each other, form a bundle and combine their forces, so the construction is 8.
This means that the force F in the direction of the arrow shown in the figure can be sufficiently resisted.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In Figures 1 to 4, reference numeral 1 denotes an inner blade of a reciprocating electric shaver, which holds a large number of inner blade units 2 whose outer peripheral edge portions are approximately semicircular arc-shaped, and two groups of the inner blade units. It consists of an inner cutter base 3.

The inner cutter base 3 is entirely made of plastic and integrally molded into a rectangular frame shape, and has front and rear frames 4, 4 and left and right frames 5, 5.
In addition, a front and rear intermediate frame 6 is installed parallel to the front and rear frames 4, 4 between the upper parts of the left and right frames 5, 5, and further extends between the front and rear frames 4, 4 and the front 1 & intermediate frame 6, respectively. The left and right intermediate frames 7, 8, and 9 for preventing deflection of the frame 6 are constructed in parallel with the left and right frames 5 and 5.

A pair of left and right support legs 10, 10 are provided on the lower surface of the front and rear intermediate frames 6 to protrude downward, and the support legs 10, 10 are molded integrally with the left and right intermediate frames 7, 9 in order to increase their strength. It becomes. Incidentally, when the five inner cutters 1 are assembled into a reciprocating electric shaver, the support legs 10 are attached to an inner cutter mount mounted on a vibration shaft that vibrates in the left-right direction.

On the upper surfaces of the front and rear frames 4 and 4 and the front and rear intermediate frames 6.

A large number of the inner cutter body bodies 2 are arranged in parallel at predetermined intervals in the left-right direction.

Rectangular coupling holes 11 are formed in the left and right frames 5, respectively. Then, the two inner cutters 1 and 1 are reversed and the lower surfaces of the inner cutter bases 3 are butted against each other.
When two cylindrical inner cutter sets are constructed, as shown in FIG. 3, the left frame 5 of one inner cutter 1 and the cloth frame 5 of the other inner cutter 1 are Frame 5 and the left frame 5 of the other inner blade 1
are overlapped on the left and right, respectively, and the coupling holes 11 and
11 so that they match each other. A shaft portion 12 of a joining piece 13 having a shaft portion 12 having a square cross section is press-fitted into the joining holes 11 that match each other.

As a result, the overlapping state of the inner cutters 1 and 1 is maintained.

At this time, it is preferable to provide a rib 12a in the axial direction on the ridge portion of the shaft portion 12, and press fit the rib 12a into the coupling hole 11 by applying a concentrated load.

Between the left frame 5 on the lower surface of the front and rear intermediate frame 6 and the left and right intermediate frame 7,
A protrusion 14 for preventing displacement in the left and right direction is provided between the cloth frame 5 and the left and right intermediate members 9, respectively. Its left and right protrusions 1
The relationship between the positions of 4 and 14 is that when the two inner cutters 1 and 1 are fitted together as described above to form a cylindrical inner cutter set, the left side of one inner cutter j or the lower end of the cloth frame 5 is engaged between the right or left frame 5 of the other inner cutter ■ and the protrusion 14 adjacent thereto, thereby preventing the inner cutter bases 3, 3 from relatively shifting in the left-right direction. .

On the lower surfaces of the front and rear frames 4, a pair of left and right ribs 15, 15 for preventing displacement in the front and rear direction, which are long in the left and right direction and are slightly shifted from each other in the front and rear directions, are formed, respectively. The rib 15・
15 indicates that when two inner cutters ml are overlapped as described above to form a cylindrical inner cutter set, the front and rear ribs 15, 15 of one example of the inner cutter engage with those of the other inner cutter 1. They are also positioned in a relationship that should prevent relative sliding movement in the front-back direction. In addition, there is a protruding gate mark G near the right end on the lower surface of each of the front and rear frames 4 and 5, so the inner blade 1 and
A gate escape hole H for escaping from the gate mark G when stacking the inner blades 1 as described above is recessed near the left end of the inner blade 1.
- 1 is designed so that it can be polymerized in close contact without being disturbed by the gate mark G.

In this case, as described above, the two inner cutters 1 and 1 overlap the lower surfaces of the inner cutter base 3 in a butting manner, and press fit the coupling piece 13 into the left and right coupling holes 11 and 11 to form the cylindrical inner cutter. As shown in FIG. 5, this inner blade set is placed between the grinding wheels 16 and 17, which rotate in the same direction, for centerless grinding.
Even if force from 6 and 17 is applied to the inner cutter bases 3 and 3, between the overlapping surfaces of the inner cutter bases 3 and 3, the ribs 15 and 15 that engage with each other prevent the front and rear frames 4 and 4 from colliding with each other. Since the relative back and forth displacement movement of the grinding wheel 1 is prevented, the grinding wheel 1
It can sufficiently resist the forces from 6 and 17 and does not bend as shown in FIG. 8, making it possible to achieve good roundness of the inner cutter body 2.

Incidentally, after sharpening Fg::, the joint piece 13 is extracted and the inner blades 1 and 1 are separated again and used as the inner blade of the reciprocating Zino electric razor.

[Another example]

The rib 15, which serves as a means for preventing displacement in the longitudinal direction, is
It may be formed continuously in the left and right directions on the lower surfaces of the frames 4, 4, and in such a case, it is possible to prevent the front and rear frames 4, 4 from bending in the vertical direction. For example, as shown in FIG. 10 and FIG.
7, a force F in the direction of the arrow is applied, and the base 3 moves as shown by the imaginary line in the figure.
! 3 z u@°060°"°59°: As a result, as shown in FIG. 12, when looking at the entire inner cutter 1 after polishing, the center in the left and right direction is polished in a convex shape, and the inner cutter body 2 Although variations in radius occur, as mentioned above, the rib 15
If the front and rear frame openings 4 are prevented from bending in the vertical direction, it is possible to polish the radius uniformly over the entire left and right direction.

Further, as a means for preventing displacement in the longitudinal direction, as shown in FIGS. 6 and 7, a groove 18 is formed on the lower surface of one of the front and rear frames 4, 4 in the left-right direction.

The groove 18 is formed on the other lower surface in the left-right direction.
It may be constructed by a combination with a protruding strip 19 having a shape that matches the above, or it may be a combination of a bottle and a hole which are not shown in the drawings or which are shaped to fit into each other.

In addition, the inner cutter base 3 may be constructed of only the front and rear frames 4 that hold only the front and rear ends of the inner cutter body 2.

(Effects of the Invention) As explained above, the inner cutter of the reciprocating electric shaver of the present invention is provided with means for preventing displacement in the longitudinal direction on the lower surfaces of the front and rear frames 4, 4 of the inner cutter base 3 made of plastic. because there is,
Even when using a centerless polishing seat, it has the advantage of being able to achieve good roundness and improving sharpness.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention,
Figure 1 is a perspective view showing the two inner cutters separated;
The figure is a bottom view of the inner cutter, FIG. 3 is a vertical cross-sectional view showing two inner cutters overlapped, and FIG. 4 is a cross-sectional view thereof. FIG. 5 is a diagram showing the state of centerless polishing of the inner cutter. 6 and 7 show another embodiment of the present invention,
FIG. 6 is a bottom view of the inner cutter, and FIG. 7 is a cross-sectional view of the two inner cutters overlapped. FIG. 8 is an explanatory diagram of the operation of the conventional inner cutter in the senderless 'gF wear state, and FIG. 9 is a bottom view of the inner cutter. FIG. 10 is an explanatory diagram of another conventional example of the operation of the inner cutter in a centerless polishing state, and FIG. 11 is a front view of the inner cutter. Figure 12 does not show the defective rlJF wear condition of the inner cutter.
This is a schematic diagram. 1...Inner blade. 2... Single inner blade configuration. 3... Inner blade base. 4... Front and rear frames of the inner blade base. 5... Left and right frames of the inner blade base. 15... Rib for preventing slippage in the longitudinal direction. 18, 19...Concave grooves and protrusions for preventing displacement in the longitudinal direction. Inventor: Fertilizer, same as Takafumi Sano

Claims (3)

[Claims] (1) An inner blade structure unit 2 whose outer peripheral blade portion has a substantially semicircular arc shape;
A plastic inner cutter base 3 having front and rear frames 4 holding at least both front and rear ends of each inner cutter unit 2 arranged in parallel at predetermined intervals in the left and right direction; and an inner cutter base 3 made of plastic. 3 is formed on the lower surfaces of the front and rear frames 4, 4 of the other inner cutter 1, and when stacked on the lower surfaces of the front and rear frames 4, 4 of the same inner cutter 1 during centerless polishing, the lower surfaces of the front and rear frames 4, 4 of the other inner cutter 1 An inner cutter for a reciprocating electric shaver, comprising a slip-preventing means that engages with a slip-preventing means formed on the inner cutter bases 3 and 3 to prevent relative displacement of the inner cutter bases 3 and 3 in the front-back direction. (2) The inner cutter of the reciprocating electric shaver according to claim 1, wherein the slip-stopping means is a rib 15 extending in the left-right direction on the lower surface of the front and rear frames 4, 4. (3) The reciprocating type according to claim 1, wherein the anti-slip means comprises a concave groove 18 formed in the left-right direction on the lower surface of the front and rear frames 4, and a protrusion 19 that engages with the concave groove 18. The inner blade of an electric razor.