JPH03140183A - Inner edge of rotary type electric razor - Google Patents

Abstract

PURPOSE:To miniaturize the electric razor, to increase the number of pieces of cutting edges and to improve the shaving speed by curving and forming a connecting piece in the rotation axis direction of an inner edge, and reducing the length in the diameter direction of the connecting piece. CONSTITUTION:An inside peripheral cutting edge 1, an outside peripheral cutting edge 2, a push-up piece 6 and a connecting piece 7 are formed integrally by sheet metal blanking, the push-up spring piece 6 is curved and formed roughly in a U-shape and the inside peripheral cutting edge 1 and the outside peripheral cutting edge 2 are erected in the roughly vertical direction against the push-up spring piece 6, and also, the connecting piece 7 is curved and formed in an L-shape against the rotation axis direction of the inner edge. Thereafter, by inserting fitting holes 4, 5 of the inner edge into a boss part 13 of the inner edge base 3 and fixing it by thermal welding, an inner edge block is constituted. As for the inner edge, in an inner edge expansion state that the inner edge is brought to blanking and formed from a sheet metal, even if the outside diameter is enlarged and cutting edges of a large number of pieces are formed, its outside diameter can be formed to a small diameter at the time when the inner edge attached to the inner edge base is completed, and accordingly, the electric razor is made small in size, the number of pieces of cutting edges is increased and the shaving speed is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inner blade of a rotary electric shaver, and particularly to one in which a cutting blade and a push-up spring piece are integrally formed of a sheet metal.

[Conventional technology]

Conventionally, in order to make it easier to assemble the inner cutter,
As shown in the figure, an inner blade for a rotary electric shaver has been proposed in which a cutting blade and a push-up spring piece are integrally formed from a sheet metal.

That is, as shown in FIG. 8, the cutting blade 1.2, the push-up spring piece 6, and the connecting piece 7 that connects a plurality of these pieces together are integrally formed by sheet metal punching, as shown in FIG. To,
As shown in FIG. 10, an inner cutter formed by bending the cutting edge 1.2 at a substantially right angle to the push-up spring piece 6 is attached to the inner cutter base 3 to form an inner cutter block. I have to.

[Problem to be solved by the invention]

By the way, as a means to improve the shaving speed,
The number of cutting edges on the inner cutter can be increased, but the number of cutting edges is determined by the number of cutting edges determined for the outer diameter of the inner cutter due to the development space of the inner cutter shown in Figure 8. I can only take a few pieces,
When the number of cutting blades is increased, the outer diameter of the inner blade becomes larger, which causes the problem of increasing the size of the electric shaver.

The present invention was made in view of these problems, and its purpose is to provide an inner blade of a rotary electric razor that is compact and has a large number of cutting blades to improve shaving speed. It is in.

[Means to solve the problem]

In order to solve this problem, the inner blade of the rotary electric shaver of the present invention has a plurality of cutting blades arranged at equal intervals in the rotational direction of the inner blade, and one end of the cutting blade is connected to the other end of the cutting blade. An inner blade of a rotary electric shaver, in which a plurality of push-up spring pieces whose ends are provided with attachment parts to an inner cutter base, and a connecting piece whose one end is integrally connected to the plurality of push-up spring pieces are integrally formed of sheet metal. The connecting piece is bent in the direction of the rotation axis of the inner cutter, and the length of the connecting piece in the radial direction is reduced.

[Effect]

According to the present invention, when the inner cutter is punched out from a sheet metal and is in the unfolded state, even if the inner cutter has a diameter larger than the outer diameter of the inner cutter base, when the inner cutter is completed and attached to the inner cutter base, the outer diameter of the inner cutter base is It can be reduced to a small diameter within the diameter range, resulting in an inner cutter with a small diameter and a large number of cutting edges.

[Embodiments] Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 7.

The inner cutter has five inner cutting edges 1 arranged at equal intervals in the rotational direction of the inner cutter and five outer cutting edges 2 arranged between the inner cutting edges 1 and 1.
and a push-up spring piece 6 whose ends are connected to the inner and outer circumferential cutting edges 1.2 and whose other end is provided with a mounting portion consisting of mounting holes 4 and 5 to the inner cutter base 3. , and a connecting piece 7 connected to the push-up spring piece 6 to connect them together. The inner peripheral cutting edge 1 has a larger U7 and a lower diameter disposed closer to the center of the inner blade than the outer peripheral cutting edge 2, and has a hemispherical protrusion 8 formed on the back surface. The pusher 1-buff piece 6 is a bifurcated pusher! The push-up spring pieces 6a, 6b are connected to the inner cutting edge 1 and the outer cutting edge 2, and the cutting edges 1.
The connecting end with 2 is bent into a substantially IJ shape to form an elastic curved part 6c.
, 6d.

The inner cutter base 3 is made of synthetic resin, and has openings 9 and 10 formed therein. As shown in FIGS. 1a and elastic curved part 6C
can be inserted into the opening 10, and the elastic curved portion 6d of the outer cutting edge 2 can be inserted into the opening 10. Further, a stopper protrusion 11 is provided on the edge of the opening 9 facing the protrusion 8 of the inner circumferential cutting edge 1, and a stopper protrusion 12 is provided on the edge of the opening 10 facing the outer circumferential cutting edge 2. The inner peripheral cutting edge 1 and the outer peripheral cutting edge 2 are prevented from collapsing due to load.

As shown in FIG. 1, the inner cutting edge 1 and the outer cutting edge 2
The push-up spring piece 6 and the connecting piece 7 are integrally formed by sheet metal punching, and then the dashed-dotted line portions shown in Fig. 1 (A to H in the figure) are bent, that is, in Figs. As shown in FIG. 4, when the push-up spring piece 6 is bent into a substantially U-shape and the inner circumferential cutting edge 1 and the outer circumferential cutting edge 2 are erected in a direction substantially perpendicular to the push-up spring piece 6. As shown in , the connecting piece 7 is bent into an L-shape with respect to the rotation axis direction of the inner cutter. Thereafter, the mounting hole 4.5 of the inner cutter is inserted into the boss portion 13 of the inner cutter base 3 and fixed by heat welding to form an inner cutter block.

FIG. 7 shows a state in which the above-mentioned inner cutter block is assembled into an outer cutter bronc. An introduction hole 16 is formed, and the inner cutting edge 1 and the outer cutting edge 2 are pressed against the outer cutter 15 by a push-up spring piece 6. Reference numeral 17 denotes a connecting boss portion connected to a drive shaft of a motor (not shown).

〔Effect of the invention〕

Since the inner cutter of the rotary electric shaver of the present invention is constructed as described above, in the unfolded state of the inner cutter formed by punching the inner cutter from a sheet metal, even if the outer diameter is increased to form a large number of cutting edges. When the inner blade is completed to be attached to the inner blade base, its outer diameter can be made small, so that a small inner blade with a large number of cutting blades and improved shaving speed can be obtained.

[Brief Description of the Drawings] Fig. 1 is a developed front view of an inner cutter showing an embodiment of the present invention; Fig. 2 is a front view showing the inner cutter of Fig. 1 in a bent state; The figure is a sectional view taken along the line X-X in Figure 2, Figure 4 is a front view of the inner cutter block with the inner cutter in Figure 2 attached to the inner cutter base, and Figure 5 is the Y of the fourth leapfrog. 6 is a sectional view taken along the line 2-2 in FIG. 4, and FIG. 7 is a sectional view showing the inner cutter block shown in FIG. 3 attached to the outer cutter block. FIG. 8 is a developed front view of the inner cutter of the conventional example, and FIG.
FIG. 10 is a front view of an inner cutter block in which the inner cutter shown in FIG. 9 is attached to an inner cutter base. l-inner cutting edge, 2 outer cutting edge, 3-inner blade base, 4.5-
Mounting hole, 6 push-up spring pieces, 7 series tie pieces.

Claims (1)

[Claims] 1) A plurality of cutting blades arranged at equal intervals in the rotational direction of the inner blade, a plurality of push-up spring pieces each having one end connected to each of the cutting blades and the other end having an attachment portion to the inner blade base; In an inner blade of a rotary electric shaver integrally formed of sheet metal with a connecting piece that integrally connects the plurality of push-up spring pieces, the connecting piece is bent in the direction of the rotational axis of the inner blade, and the inner blade of the connecting piece is The inner blade of a rotary electric shaver is made by reducing the length in the radial direction of the blade.