JPH03268784A - Electric razor - Google Patents

Abstract

PURPOSE:To simplify the manufacture of an inner blade, to reduce its manufacturing cost, and also, to improve the cutting quality by forming the inner blade from a perforated plate on which many beard intrusion hole parts are formed. CONSTITUTION:In an inner blade, many beard intrusion hole parts are formed, and in the part running along the beard intrusion hole part of this inner blade, a cutting edge part 17b protruded to the outside is formed. Also, the cutting edge part 17b is formed at an acute angle. The beard intrusion hole part and the cutting edge part 17b in the inner edge can be formed easily by press working. In this case, the cutting edge part 17b of the inner edge 17 and a cutting edge part 19b of an outer blade 19 execute a reciprocating motion in a close state by pressing force of some extent on all faces. Accordingly, by this condition and the acute angle of the cutting edge parts 17b, 19b, the cutting quality is improved in all the parts of the inner blade and the outer blade 19. In such a way, by the constitution in which said inner blade is formed from a perforated on which many beard intrusion hole parts are formed, the inner blade can be manufactured simply, its manufacturing cost can be reduced, and also, the cutting quality can be improved.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is characterized in that an inner cutter slides in an outer cutter that is curved into a convex shape and is provided with a large number of hair penetration holes on the entire surface.
This invention relates to an electric razor that uses an inner cutter and an outer cutter to cut off beards that enter the outer cutter through a beard entry hole.

(Prior Art) Conventionally, for example, in a reciprocating electric shaver, an inner cutter assembly is installed inside a semi-cylindrical outer cutter that is curved into a convex shape and provided with a large number of hair penetration holes on the entire surface. It is designed to be driven forward in the longitudinal direction.

As shown in FIG. 13, this inner cutter assembly usually has 10 to 20 inner cutters 1 having a cut plate shape and a thickness of about 0.11 arranged in parallel on the upper surface of an inner cutter mounting base 2. It has a similar structure.

(Problem to be solved by the invention) However, such a large number of inner cutters 1 cannot be mounted on the inner cutter mounting base 2.
Assembling the inner cutters 1 on top and polishing the peripheral surfaces of all the inner cutters 1 into the same shape requires a lot of effort and time, which unfortunately increases the manufacturing cost of the inner cutter assembly.

In addition, when cutting hairs with the inner blade 1 and the outer blade, it is desirable that the part of the blade that touches the hair be at an acute angle in order to improve the cutting quality.However, if a large number of inner blades 1 are formed into the same shape by polishing In this case, the blade angle of the inner cutter 1 is at a right angle, so that a satisfactory sharpness cannot necessarily be obtained. For this reason, the corners of the inner cutter 1 are sometimes formed into acute angles by etching or the like on the side surfaces of the corners of the inner cutter 1, but this also takes time and effort, and increases costs. It was the cause.

Furthermore, the tips of the many inner cutters 1 are pressed against the inner surface of the outer cutter by springs, and a certain amount of pressing force acts between the tips of the inner cutters 1 and the inner surface of the outer cutter. However, when the inner cutter is pressed against the outer cutter by the spring, the force acts only in the direction of the tip of the inner cutter, so when pressing between the side of the inner cutter 1 and the inside surface of the outer cutter, the force Since it is smaller than the inner cutter l
There is a tendency for the sharpness of the beard to decrease due to the sides.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electric shaver whose inner cutters are easy to manufacture, can reduce manufacturing costs, and can improve sharpness.

(Means for Solving the Problems) Based on this object, the present invention provides an inner cutter that slides in an outer cutter that is curved into a convex shape and provided with a large number of hair penetration holes on the entire surface. In the electric shaver, the inner cutter and the outer cutter cut beard hair that enters the outer cutter through the beard entry hole, wherein the inner cutter is formed from a perforated plate in which a large number of beard entry holes are formed. It is characterized by being an electric shaver.

The inner cutter is made of an elastic material, the outer cutter and the inner cutter are curved in a convex arc, and the outer radius of the inner cutter is larger than the inner radius of the outer cutter. has been done.

Furthermore, an edge of the inner cutter is attached to an inner cutter mount, and the inner cutter mount is provided with a support plate that supports the inner surface of the inner cutter.

Furthermore, the peripheral edge of the support plate is formed of a large number of curved edges having different radii of curvature.

(Function) In an electric shaver with such a configuration, as the inner cutter reciprocates or rotates, the hairs that enter the outer cutter's hair entry hole and the inner cutter's hair entry hole are separated from the outer and inner blades. It is cut off with.

The inner cutter is made of an elastic material, the outer cutter and the inner cutter are curved in a convex arc, and the outer radius of the inner cutter is larger than the inner radius of the outer cutter. In this configuration, by pressing the inner cutter against the inner surface of the outer cutter, the inner cutter is entirely inscribed on the inner surface of the outer cutter by its own elastic force, so that the tip and side portions of the inner cutter are in contact with the outer cutter. They will reciprocate or rotate while in close contact with each other.

Moreover, in a configuration in which the inner cutter has an edge attached to the inner cutter mount, and the inner cutter mount is provided with a support plate that supports the inner surface of the inner cutter, the inner cutter and the outer cutter Even if a pressing force is applied to the outer cutter because the outer cutter is supported by the support plate, the outer cutter and the inner cutter are prevented from being deformed.

Further, in a configuration in which the peripheral edge of the support plate is formed from a large number of curved edges having different radii of curvature, the inner cutter and the outer cutter are correctively curved along the shape of the peripheral edge of the support plate.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 9.

[First Embodiment] FIGS. 1 to 6 show a first embodiment of the present invention.

In FIG. 1, 10 is the main body of the electric shaver, 11 is a slit provided at the top of the main body 10, and 12 is a slit 1.
A soft rubber seal member 1 is provided in the inner blade 1, and 13 is an inner blade drive shaft that penetrates the seal member 12 and projects upward. This inner blade drive shaft 13 is configured to be reciprocated in the longitudinal direction of the slit 11 by a motor (not shown). Since this structure employs a well-known structure, its explanation will be omitted.

A clip 14 is fixed to the upper end of the inner cutter drive shaft 13, and a base mounting member 15 is attached to the inner cutter drive shaft 13 so as to be vertically movable and tiltable in any direction.

A spring S is interposed between the base mounting member 15 and the seal member 12, and the base mounting member 15 is attached to the clip 1.
It is biased towards the 4th side. Note that since the seal member 14 is supported from below by a support wall (not shown) that is integrated with the inner cutter drive shaft 13, it is not bent downward by the spring force of the spring S.

An inner blade mount 16 made of synthetic resin is removably attached to the mount member 15 . The inner cutter mount 16 has a shape formed by cutting out the edge of a cylinder into a plate shape in a direction parallel to the axis, and side surfaces 16a, 16a are formed in an arc shape. A large number of attachment protrusions 16b are formed on the side surfaces 16a, 16a. Inner blade mounting base 1
A plurality of locking pawls 16c are provided on the bottom surface of the central portion of 6, and is attached to the base mounting member 15 by these locking pawls 16c.

A side edge portion of a thin inner cutter 17 made of a cutter steel plate such as stainless steel is attached to the side surfaces 16a, 16a. This attachment is done through the attachment hole 17C provided on the side edge of the inner blade 17.
This is done by inserting the attachment protrusion 16b into the hole (see FIG. 2A) and then caulking the attachment protrusion 16b as shown in the figure. With this fixation, the inner cutter 17 is
As shown in the figure, it has a turned cylindrical shape and is curved upward in a convex shape.

Note that, assuming that the radius of curvature of the inner cutter 17 is R1, the maximum width a of the inner cutter mount 16 is smaller than 2R1.

This inner cutter 17 is formed with a large number of hair penetration holes 17a, and a portion of the inner cutter 17 along the hair penetration holes 17a is formed with a cutting edge portion 17b that projects outward.

This cutting edge portion 17b is formed at an acute angle as shown in FIG. Hair penetration hole 17 in such inner cutter 17
a and the cutting edge portion 17b can be easily formed by press working.

In addition, a rectangular frame-shaped outer cutter case 18 is provided at the upper end of the main body lO.
is removably attached to the upper opening 18a of the outer cutter case 18, and a semicylindrical outer cutter 19 curved into a convex shape (turning tube shape) is attached to the upper opening 18a of the outer cutter case 18. In addition, the outer cutter 19 includes a large number of whisker penetration holes 19a and the whisker penetration holes 19.
A cutting edge portion 19b protruding toward the inner surface along line a is formed on the entire surface. This cutting edge portion 19b is formed at an acute angle as shown in FIG. The outer cutter 19 is also formed from the same material as the inner cutter 17 in the same manner.

Moreover, the outer radius R1 of the inner cutter 17 (see 3rd rXJ) is slightly larger than the inner radius R2 of the outer cutter 19 (see FIG. 4). The inner cutter 17 is pressed against the inner surface of the outer cutter 19 by the action of the spring S and is deformed as shown in FIG. At this time, since the outer radius of the inner cutter 17 is larger than the inner radius of the outer cutter 19, the side of the inner cutter 17 is also brought into close contact with the side of the outer cutter 19.

Next, the operation of such a configuration will be explained.

In an electric shaver having such a configuration, a motor (not shown) is operated to move the inner blade drive shaft 13 through the slit 11 in FIG.
When the inner cutter 17 is reciprocated in the longitudinal direction, the inner cutter 17 is reciprocated in the longitudinal direction while closely contacting the inner surface of the outer cutter 19.

With this reciprocating drive, when the whiskers 20 enter the whisker penetration hole 19a of the outer cutter 19 and the whisker penetration hole 17a of the inner cutter 17 as shown in FIG. 19b and the tip of the acute-angled cutting edge portion 17b of the inner cutter 17 to be pinched and cut.

In a configuration in which the outer cutter 19 and the inner cutter 17 are formed into a turning cylindrical shape, and the outer radius of the inner cutter 17 is formed slightly larger than the inner radius of the outer cutter 19, the inner cutter 17
The blade reciprocates with the tip and side portions in close contact with the outer cutter 19. That is, in reality, the inner cutter 17
The cutting edge portion 17b of the outer cutter 19 and the cutting edge portion 19b of the outer cutter 19 reciprocate in close contact with each other with a certain amount of pressing force on all surfaces. Therefore, due to this condition and the acute angles of the cutting edges 17b and 19b, the sharpness of all parts of the inner cutter 17 and the outer cutter 19 is improved.

Moreover, since the inner cutter 17 can be formed from a single thin cutter steel plate or the like, the inertial force of the inner cutter 17 can be reduced.

As a result, by bringing the inner cutter 17 and the outer cutter 19 into close contact,
Even if the frictional force generated between the inner cutter 17 and the outer cutter 9 is slightly larger than that of the conventional type, and the load on the motor due to this frictional force increases, the inertial force of the inner cutter 17 is reduced. Since the load on the motor due to inertial force is accordingly smaller than that of the conventional type, the load on the motor does not substantially increase.

[Second Embodiment] FIGS. 7 to 10 show a second embodiment of the present invention.

In this embodiment, as shown in FIG.
This figure shows an example in which the support plate 21 is provided integrally with the inner cutter mount 16 in the embodiment, and the inner surface of the inner cutter 17 is supported by the support plate 21. As a result, the inner cutter 17 and the outer cutter 19
is supported by the support plate 21, so even if a pressing force is applied to the outer cutter 19, the outer cutter 19 and the inner cutter 17 are prevented from being deformed.

Further, in this embodiment, the peripheral edge of the support plate 21 has a radius of curvature r
l, r2. A large number of curved edges 21a, 2 different from r3
1b.

21c. In this configuration, the inner cutter 17 and the outer cutter 19 are corrected and curved along the peripheral edge shape of the support plate 21. In this example, the radius of curvature is rl
, r2. The curved edges 21a are formed to be larger in the order of r3 and have the smallest radius of curvature rl at the tip of the support plate 2.

Furthermore, as shown in FIG. 7, by forming the hair inlet hole 19a near the top A of the outer cutter 19 into a smaller pattern than the hair inlet hole 19a on the side, the top of the outer cutter 19 can be easily bent. are doing. As a result, when the inner cutter 17 whose top portion has been corrected to a small curvature by the support plate 21 comes into elastic contact with the inner surface of the outer cutter 19, the outer cutter 19 is also corrected into the shape of the support plate 21. By doing this, the top of the outer cutter 19 is curved with a small curvature, making it easier to shave narrow areas such as under the nose.

Therefore, it is usually better to shave the beard using the part corresponding to the radius of curvature r2, and to shave the narrow part such as under the nose using the part corresponding to the radius of curvature rl.

[Third Embodiment] FIGS. 11 and 12 show a third embodiment of the present invention.

This embodiment shows an example in which the present invention is applied to an electric shaver having a rotary inner cutter.

In this embodiment, as shown in FIG. 11, the main body 22 of the electric shaver is provided with a cylindrical portion 22a at the tip,
A rotating shaft 23 that is rotationally driven by a motor (not shown) is provided at the center of this cylindrical portion 22m.

The center of the bottom of a bottomed cylindrical inner cutter mounting base 24 is attached to the rotating shaft 23 in a detachable and relatively non-rotatable manner.

This inner cutter mount 24 is provided with a protrusion 25, and the upper end opening of this inner cutter mount 26 is closed with a dome-shaped inner cutter 26 made of a thin plate material such as a stainless steel plate. The protrusion 25 is connected to the hole 2 provided in the ear portion 27 of the inner cutter 26.
The inner cutter 26 is fixed to the inner cutter mounting base 24 by passing through the inner cutter 7a.

In the figure, 28 is a dome-shaped outer cutter made of a thin plate material such as a stainless steel plate, and this outer cutter 28 is detachably attached to the cylindrical portion 22a. A well-known structure is used for this attachment.

The inner cutter 26 and the outer cutter 28 have a large number of hair penetration holes 26.
m, 28a are formed respectively, and the inner cutter 2
Cutting edges 26b and 28b are formed on the outer surface of the blade 6 and the inner surface of the outer cutter 28, as shown in FIG. This cutting edge 26
b.

28b is also formed at an acute angle.

In this embodiment, by rotating the inner blade 26, the hair that has entered the hair entry holes 26a and 28a is cut between the sharp cutting blades 26b and 28b.

(Effects of the Invention) The present invention has an inner cutter that slides in and out of an outer cutter that is curved into a convex shape and provided with a large number of hair penetration holes on the entire surface.
In the electric shaver, the inner cutter and the outer cutter cut beard hair that enters the outer cutter through the beard entry hole, and the inner cutter is formed from a perforated plate in which a large number of beard entry holes are formed. Therefore, the inner cutter can be manufactured easily, the manufacturing cost can be reduced, and the sharpness can be improved.

The inner cutter is made of an elastic material, the outer cutter and the inner cutter are curved in a convex arc, and the outer radius of the inner cutter is larger than the inner radius of the outer cutter. By pressing the inner cutter against the inner surface of the outer cutter, the inner cutter is brought into close contact with the entire inner surface of the outer cutter with a certain degree of adhesion force due to its own elastic force, and the sides of the inner cutter and outer cutter are The sharpness also improves on the sides.

Moreover, in a configuration in which the edge of the inner cutter is attached to the inner cutter mount and a support plate that supports the inner surface of the inner cutter is provided on the inner cutter mount, the inner cutter and the outer cutter are Since they are supported by the support plate, even if a pressing force is applied to the outer cutter, the outer cutter and the inner cutter are prevented from being deformed.

Further, in a configuration in which the peripheral edge of the support plate is formed from a large number of curved edges having different radii of curvature, the inner cutter and the outer cutter are corrected and curved along the peripheral shape of the support plate. Therefore, by selecting the optimal radius of curvature depending on the area to be shaved,
You can shave your beard efficiently.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an electric shaver according to the present invention. 2 is an enlarged perspective view showing the inner cutter mounting base and inner cutter shown in FIG. 1. FIG. FIG. 2A is a cross-sectional view of the attachment portion between the inner cutter mount and the inner cutter in FIG. 2. FIG. 3 is a side view of the inner cutter shown in FIG. 1. ! Figure @4 is a partial sectional view showing the relationship between the outer cutter case and the outer cutter shown in FIG. 1. FIG. 5 is an explanatory diagram showing a state in which the inner cutter is assembled into the outer cutter shown in FIG. 4. FIG. 6 is an explanatory diagram of the operation of the inner cutter and outer cutter shown in FIG. 1. FIG. 7 is an exploded perspective view showing a second embodiment of the electric shaver according to the present invention. FIG. 8 is a perspective view of the inner cutter mount and inner cutter shown in FIG. 7. FIG. 9 is a side view of the inner cutter of FIG. 7. FIG. 10 is a perspective view of the inner cutter mount shown in FIG. 7. FIG. 11 is an explanatory diagram showing a third embodiment of the electric shaver according to the present invention. FIG. 12 is a sectional view showing the relationship between the inner cutter and outer cutter shown in FIG. 11. FIG. 13 is a partial perspective view of a conventional inner cutter. 16... Inner blade mounting base 17... Inner blade 17a... Beard penetration hole 17b... Cutting blade part 19... Outer blade 19a... Beard penetration hole 19b... Cutting blade part 20... Beard 21... Support plates 21a to 21c... Curved edge 26... Inner blade 26a... Beard penetration hole 28... Outer blade 28a... Beard penetration hole FIG. Fig. 2 Fig. A Fig. Fig. Fig. Fig. Fig. 673-

Claims (4)

[Claims] (1) The inner cutter slides in the outer cutter, which is curved into a convex shape and is provided with a large number of hair inlet holes on the entire surface, and removes the hairs that enter the outer cutter from the hair inlet holes. An electric shaver that cuts with an inner cutter and an outer cutter, characterized in that the inner cutter is formed from a perforated plate in which a large number of hair penetration holes are formed. (2) The inner cutter is made of an elastic material, the outer cutter and the inner cutter are curved into a convex arc, and the outer radius of the inner cutter is larger than the inner radius of the outer cutter. The electric shaver according to claim 1, characterized in that: (3) The inner cutter has an edge attached to an inner cutter mount, and the inner cutter mount is provided with a support plate that supports the inner surface of the inner cutter. The electric shaver according to item 1 or 2. (4) An electric shaver characterized in that the peripheral edge of the support plate is formed from a number of curved edges having different radii of curvature.