JPS592514B2 - rotary electric razor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary electric shaver, and its first object is to provide a rotary electric shaver in which the contact between the outer cutter and the inner cutter is improved. The second objective is to provide a rotary electric shaver that can smoothly cut long hair.

In conventional rotary electric shavers, the outer cutter frame on which the outer cutter is attached and the inner cutter frame on which the inner cutter is attached can be separated from the main body of the electric shaver. When the blade frame is installed, the center axes of each part may not match due to dimensional errors or assembly errors such as the drive shaft being slightly tilted or eccentric rather than perpendicular, and the center axes may not match. When assembled, the contact between the outer cutter and the inner cutter is poor, creating a gap between the two, resulting in lower cutting quality and increased noise. In the case where an annular guide ring is concentrically protruded and fitted into a notch formed on the cutting edge of the inner cutter, the gap formed between the side walls of the guide ring and the notch is It fluctuates constantly due to the oscillation of the inner cutter as it rotates,
In order to cut long hair, the three-dimensional slit-shaped hair introduction hole leading to the side wall of the guide ring is blocked by an inner blade, making it impossible to introduce long hair into the hair introduction hole and cut it smoothly. However, there is a drawback that noise is generated due to interference between the guide ring and the notch.

The present invention has been made in view of the above drawbacks, and will be described below with reference to the drawings showing one embodiment of the present invention.

In the figure, reference numeral 1 denotes an outer cutter having a dish-shaped inner surface with a large number of hair introduction holes, and the peripheral edge of the outer cutter 10 is fixed to an annular outer cutter frame 2.

An annular guide ring 5 is concentrically protruded from the inner surface of the outer cutter 1.

The guide link 5 is formed with a three-dimensional slit-shaped hair introduction hole that is continuous with the upper surface of the outer cutter 1.

In the first embodiment shown in FIGS. 1 to 4, the guide ring 5 is formed by bending the outer cutter 1 to form an annular protrusion projecting inward, and has a wear-resistant material on the top surface of the annular protrusion. Although a ring 9 with good wear resistance is attached, the guide ring 5 may be formed by simply bending the outer cutter 1 as in the second embodiment shown in FIG.

3 is an inner cutter, 4 is an inner cutter frame that elastically supports three inner cutters 3, and the inner cutter frame 4 has a fitting hole 10 in the center of the back surface thereof to be connected to a drive rod (not shown). , a hole 11 into which each inner cutter 3 is inserted is formed.

The inner cutter 3 is loosely fitted into the hole 11 formed in the inner cutter frame 4, and the support spring 8 (
In the embodiment, the vicinity of the self-curving end of the wire spring (wire spring) is fitted into the elongated hole 12 of the inner cutter 3, thereby being elastically supported.

The long hole 12 is elongated in the radial direction of rotation of the inner cutter 3.

Therefore, the inner cutter 3 is elastically supported by the inner cutter frame 4 and is movable in the rotational radial direction.

6 is a notch formed in the cutting edge 7 of the inner cutter 3, and the guide ring 5 fits into the notch 6 when the cutting edge 7 of the inner cutter 3 comes into elastic contact with the inner surface of the outer cutter 1 as shown in FIG. That's what I do.

Reference numeral 13 indicates gap maintaining means in the form of small protrusions formed on both side edges of the notch 6. The gap maintaining means 13.13 abuts against the inner and outer surfaces of the guide ring 5, thereby preventing contact between the notch 6 and the guide ring 5.
This reduces the area.

14 is a screw for fixing the outer cutter frame 2 to the main body (not shown).

When the outer cutter frame 2 to which the outer cutter 1 is attached and the inner cutter frame 4 to which the inner cutter 3 is attached are attached to the electric shaver body and the inner cutter frame 4 is rotated by the drive rod, each inner cutter 3 is attached to the guide ring 5. The cutting edge 7 is rotated with the cutting edge 7 being brought into elastic contact with the inner surface of the outer cutter 1 using the cutting edge 7 as a guide.

In the embodiment, a gap maintaining means in the form of a small protrusion is provided in the notch of the inner cutter, but it may also be provided in the guide ring of the outer cutter, or alternatively, the gap maintaining means may be provided in the notch and the guide ring at different positions. It may be provided.

Furthermore, even if the gap maintaining means is not in constant contact with the side wall,
Any material may be used as long as it comes into contact with the side wall due to the centrifugal force generated by the rotation of the inner cutter, and in this state, the hair can be easily introduced into the hair introduction hole formed in the side wall of the guide ring.

Furthermore, it is preferable that the guide link be in contact with the side wall where the hair introduction hole is not formed, but if the width is wider than the inner dimension of the hair introduction hole, a gap maintaining means may be provided in the hair introduction hole. It's good to do something like this without feeling depressed.

As described above, the electric shaver of the present invention includes an outer cutter having a dish-shaped inner surface with a large number of hair introduction holes, an outer cutter frame to which the peripheral edge of the outer cutter is fixed, and an outer cutter that comes into elastic contact with the inner surface of the outer cutter. Consisting of a rotating inner cutter and an inner cutter frame that elastically supports the inner cutter, an annular guide ring is concentrically protruded from the inner surface of the outer cutter, and the upper surface of the outer cutter is attached to the side wall of the guide link. a three-dimensional slit-shaped hair introduction hole continuous with the inner cutter, a notch that fits into the guide ring on the cutting edge of the inner cutter, and a gap formed between the side walls of the guide ring and the notch. The present invention is characterized in that at least one of the kite ring and the notch is provided with a gap maintaining means for maintaining the gap.
Since the inner cutter rotates in a stable position relative to the outer cutter with almost no increase in load, the inner cutter and outer cutter are in close contact with each other, resulting in a rotary electric shaver with good cutting quality and low noise. Furthermore, since the gap formed between the guide ring and the notch does not change, the three-dimensional slit-shaped hair introduction hole formed for cutting long hair will not be blocked by the inner blade, and the long hair will be cut into the long hair. It has the effect that it can be introduced into the introduction hole and cut smoothly.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention, and Fig. 2 is a partially cutaway perspective view of an outer cutter frame with an outer cutter attached thereto, and Fig. 2 is a perspective view of an inner cutter frame with an inner cutter of the above embodiment attached. , FIG. 3 is a partially enlarged sectional view of FIG. 2, FIG. 4 is a partial sectional view showing the relationship between the outer cutter and the inner cutter of the above embodiment, and FIG. 5 is an outer cutter in another embodiment of the present invention. FIG. 3 is a partial cross-sectional view showing the relationship between the inner cutter and the inner cutter. 1...Outer cutter, 2...Outer cutter frame, total...Inner cutter, 4...Inner cutter frame, 5...
...Guide ring, 6...Notch, 7...
...Blade edge, 8...Support spring, 9...
・Ring, 10... Fitting hole, 11...
Hole, 12...Elongated hole, 13...Gap maintaining means, 14...Screw.

Claims (1)

[Claims] 1. An outer cutter having a dish-shaped inner surface with a large number of hair introduction holes, an outer cutter frame to which the peripheral edge of the outer cutter is fixed, an inner cutter that rotates in elastic contact with the inner surface of the outer cutter, and the inner cutter. It consists of an elastically supported inner cutter frame, an annular guide ring concentrically protruding from the inner surface of the outer cutter, and a three-dimensional slit-shaped hair introduction hole continuous with the upper surface of the outer cutter on the side wall of the guide link. A notch is formed in the cutting edge of the inner cutter to fit into the guide ring, and a gap maintaining means for maintaining the gap formed between the side walls of the guide ring and the notch is provided in the guide ring. and the notch.