JPS6038460Y2 - electric razor - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a blade structure of an electric shaver.

〔the purpose〕

The purpose of this invention is to support the outer cutter from the inside so that the outer cutter will not be damaged or plastically deformed due to repeated energization or external impact force during regular use of the flexible outer cutter. This is what I did.

[Prior art]

Conventionally, the outer blades of electric razors are often made of thin foil, and in particular, the outer blades made of flexible materials such as nickel or nickel alloys are easily deformed by the pressure applied during shaving. Therefore, after being used several times, the mesh of the outer cutter may break or break due to repeated bending or local wear, and the inner cutter, which is sliding against the inner surface of the outer cutter, may become damaged. The hit caused damage to both the outer blade and the inner blade.

Furthermore, if unnecessary force is applied to the outer cutter, the outer cutter itself is plastically deformed, making it unusable.

As a method to solve these drawbacks,
A method such as No. 26491 has been proposed.

In this proposal, when the outer cutter deforms inward, a part of the stopper formed on the inner cutter holder that holds the inner cutter, which is slidably pressed against the inner surface of the outer cutter so as to be movable up and down, is inserted into the center of the outer cutter. The content is that both blades can be held without damage by keeping the deformation of the outer cutter within the elastic limit by contacting them, and by setting the amount of deflection of the inner cutter smaller than the amount of deformation of the outer cutter. The unnecessarily applied force is applied directly to the inner cutter holder, and in many cases, the inner cutter holder, which is made of synthetic resin, becomes deformed and caved in, reducing the pressure force between the outer and inner cutters and reducing the shearing function. becomes unsustainable.

Also, when the inner cutter holder and the drive transmission member attached to the motor rotating shaft by press fit etc. engage, there is some play in this engagement part, and if used for a long time while receiving the biasing force from the outer cutter, As the wear increases due to depression, the inner cutter holder rotates at an angle with respect to the outer cutter, and the inner cutter that is locked to the inner cutter holder also becomes inclined, and when the inner cutter slides in pressure contact with the outer cutter, the inner cutter rotates at an angle with respect to the outer cutter. This type of cutting causes uneven wear on the outer cutter, reducing its strength and even causing it to break.

In addition, in a structure where the outer cutter directly hits a part of the stopper formed on the inner cutter holder, when a strong external biasing force is applied, the wide surface of the outer cutter hits a part of the stopper, causing the inner cutter to rotate. The load on the moving motor increases and the rotational speed decreases, resulting in a decline in shearing function.On the other hand, if a part of the stopper and the outer blade are configured to make point contact, the outer blade will be formed into a thin foil shape. Because of this, there was a drawback that the contact parts were subject to damage such as deformation and tearing due to wear and impact.

[Structure]

The present invention has been made to eliminate such drawbacks, and includes a rotating shaft 10 of a motor 9 that is securely fixed to an electric shaver main body case etc. with screws or the like, or a drive transmission member that is fixed to the rotating shaft by press fitting or the like. 11 is inserted halfway into a through hole 8 formed in the center of an inner cutter holder 6 that holds an inner cutter 5 that slides in pressure contact with the inner surface of the outer cutter so as to be movable up and down. and an outer blade holder 16 which is movable up and down at the top of the through hole 8 and is locked to prevent the puller from falling.
The upper surface 19 of the outer cutter holder 16 contacts the lower part 15 of the outer cutter 1.
It is arranged with a minute gap between the center inner surface 0 and the center surface.

[Effect]

Therefore, the outer cutter 1 is slightly deformed and comes into contact with the upper surface 14 of the drive transmission member 11 via the outer cutter holder 16 without directly applying a biasing force to the outer cutter from the outside on the inner cutter holder 6. The durability is improved and the shearing function can be maintained for a long time.

[Embodiment] The present invention will be described below based on an embodiment. FIG. 1 shows an embodiment of the present invention and shows a cross section of a main part.

FIG. 2 is a view of the engagement portion between the drive transmission member and the inner cutter holder at the AA position in FIG. 1, viewed from the motor side.

In FIG. 1, an outer cutter 1, which is made of a material such as nickel or a nickel alloy (for example, a nickel-cobalt alloy) by electroforming or the like and has a large number of whisker introduction holes, is formed by an outer frame 2 and an inner frame 3. It is sandwiched, and there is a recessed part 4 in the center.
is formed, giving it an almost dome-like shape.

A plurality of inner cutters 5 are provided on the inner surface of the outer cutter 1 so as to be able to press and slide freely.
is disposed and is biased and locked to the inner cutter holder 6 by an inner cutter spring 7 so as to be able to move up and down.

A through hole 8 is formed in the center of the inner blade holder 6 , and a drive transmission member 11 press-fitted into the rotating shaft 10 of the motor 9 enters halfway into the through hole 8 .
As shown in FIG. Since the portion 13 also has a shape obtained by cutting both sides of a circle, the lower portion 1 of each of the drive transmission member 11 and the inner cutter holder 6
2 and the lower end portion 13 are engaged with each other, so that the rotational drive of the motor 9 can be transmitted to the inner cutter holder 6 and the inner cutter 5 via the drive transmission member 11.

Further, at the upper part of the through hole 8 formed in the inner cutter holder 6, an outer cutter holder 16 made of synthetic resin and having legs 15, 15 split into pieces and having spring properties is movable up and down. The stepped portion 17 formed at 8 and the tip convex portion 1 of the leg piece 15.15
8.18 is engaged so that the puller does not fall from the inner cutter holder 6.

Further, the tip convex portion 18.18 of the outer cutter receiver 16 is in contact with the upper surface 14 of the drive transmission member 11 within the through hole 8.

The upper surface 19 of the outer cutter holder 16 is always spaced at a predetermined distance from the inner surface 20 of the central concave portion 4 of the outer cutter 1 (the optimum value is 0.57 f).
rIn or less), and when the outer cutter is biased from the outer surface of the outer cutter 1, the upper surface 19 of the outer cutter receiver 16 and the outer cutter 1
The inner surface 20 is configured to slidably abut.

Note that 21 is an opening/closing tool which is urged outward by a spring 22 and attaches the inner frame 3 to the main body case 23.

24 is fixed to the main body case 23, and has an opening/closing tool 21 and a spring 2.
I love opening/closing devices that support #2.

Note that the outer cutter holder 16 only needs to be locked to the inner cutter holder 6 and does not necessarily need to rotate together with the inner cutter holder, but the electric shaver may be used in any posture. As such, it is desirable that the outer cutter holder 16 is side-locked to the inner cutter holder 6.

In other words, if the outer blade holder 16 does not generate any frictional force when moving vertically against the inner blade holder 6, the outer blade holder 16 may come into contact with the inner surface of the outer blade when the electric shaver is used at an angle. The device may move away from the device and repeat this action, resulting in unpleasant vibration noise and wasted power consumption.

For this reason, if the legs 15, 15 of the outer cutter 16 are urged outward and the tip convex portion 18.18 is pressed against the inner wall of the hole of the inner cutter holder 6, the outer cutter holder 16 will not move up and down unnecessarily. There is no.

In this case, the inner cutter holder rotates to some extent together with the inner cutter holder.

〔effect〕

The present invention is constructed as described above, and if the outer cutter 1 does not receive more than necessary outer cutter bias, the inner surface 20 of the outer cutter 1 and the upper surface 19 of the outer cutter receiver 16 will not come into contact with each other, and the outer cutter 1 The pressure contact between the inner blade 5 and the inner cutter 5 is good, and the hair can be sheared without difficulty.

In addition, even if the outer cutter 1 receives an unexpected impact force or an excessive force on the outer cutter than necessary, the outer cutter 1 deforms slightly and then returns to the upper surface 1 of the outer cutter holder 16.
9 and it will not deform any further, so the double-edged blade 1
, 5 are maintained in good contact condition.

In addition, unlike the conventional structure, the outer cutter 1 is not in direct contact with the inner cutter holder, so the inner cutter holder 6 is not subjected to force due to outer cutter bias or impact, and the inner cutter 5 is not tilted to the outside. The inner cutter holter 6 does not suffer uneven wear due to sliding pressure contact with the blade 1, or damage such as deformation or depression of the inner cutter holter 6 due to external force applied to the outer cutter 1, and a good pressure contact state can be maintained permanently.

In particular, since the outer blade holder 16 can be attached to and removed from the through hole 8 of the inner blade holder 6, the gap between the inner surface 20 of the outer blade 1 and the upper surface 19 of the outer blade holder 16 can be adjusted as appropriate by replacing the outer blade holder 16. .

This can be adjusted by looking at variations in each part and the extent to which the inner surface of the outer blade is deformed by the user.

In addition, the outer cutter 1 is connected to the upper surface 1 of the drive transmission member 11 via the outer cutter holder 16.
4, the amount of deformation of the outer cutter 1 due to external force is forcibly reduced.
m) can also be formed, and a close shave, which is an important performance for sharpness, can also be achieved.

Furthermore, since the outer cutter 1 is made of metal, if the outer cutter holder 16 is made of a synthetic resin material, there will be less wear and contact resistance.

In addition, the contact surface of the upper surface 19 of the outer cutter holder 16 with the outer cutter 1 has an R shape (
R5 or more) not only reduces the contact resistance, but also improves the durability of the outer cutter 1 because the entire R surface receives the outer cutter 1 when the outer cutter 1 receives more force than necessary.

Furthermore, if the contact surface of the upper surface 19 with the outer cutter 1 is mirror-finished, the resistance is further reduced and a smooth outer cutter receiving structure can be achieved.

Furthermore, if the contact surfaces between the upper surface 14 of the drive transmission member 11 and the tip convex portion 18 of the outer cutter receiver 16 are configured with a flat surface on one side and a rounded surface on the other side, the contact resistance will be further reduced, and energy loss in the drive portion will be reduced. Therefore, it improves shearing function.

Furthermore, if both parts 14 and 18 of the contact portion are formed with a mirror surface, the effect will be further enhanced.

Incidentally, since the outer cutter having a concave center is easily deformed, this effect is particularly large.

In addition, a large number of small holes are formed in the sliding contact area of the inner cutter 5 on the outer cutter 1 in the embodiment of the present invention. Elongated holes are arranged in a substantially radial manner (near the end portion), and the elongated holes that enter the recessed portion 4 are cut by the elongated holes.

However, the cross-sectional shape of the outer cutter is not limited to the above-mentioned embodiments, and may be dome-shaped (for example, spherical) having a continuous curved surface without a central recess.

Further, in the embodiment, the outer cutter holder is brought into contact with the drive transmission member fixed to the rotating shaft of the motor when the outer cutter is deformed, but it may be made to contact directly with the rotating shaft of the motor. Of course.

In this case, a non-circular portion is formed on a part of the rotating shaft and engaged with the inner cutter holder, thereby driving the holder to rotate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention. FIG. 2 is a plan view of the engagement portion between the drive transmission member and the inner cutter holder at the AA position in FIG. 1 from below. 1... Outer blade, 2... Outer frame, 3...
...Inner frame, 4...Concave portion, 5...Inner blade, 6...Inner blade holder, 7...Inner blade spring, butt... ...Through hole, 9...Motor 10
... Rotating shaft, 11 ... Drive transmission member,
12... Lower part of the drive transmission member, 13...
・Lower end of through hole, 14... upper surface of drive transmission member, 15... foot piece, 16... outer blade holder,
17...Step part, 18...Tip convex part of outer blade holder, 19...Top surface of outer blade holder, 20...-
・Inner surface of the central concave part of the outer blade.

Claims (1)

[Scope of utility model registration request] In an electric shaver in which an inner cutter 5 slides in pressure contact with the inner surface of a visible outer cutter 1, a through hole 8 is formed in the center of an inner cutter holder 6 in which the inner cutter 5 is held so as to be movable up and down. Elastic legs of an outer cutter holder 16 are removably locked on the sides of the upper part of the through hole 8, and the tip protrusion 18 is inserted halfway into the through hole 8 to hold the inner cutter holder 6. The upper surface 19 of the outer cutter holder is in contact with the upper surface 14 of the rotating shaft 10 of the motor 9 to be rotationally driven or the drive transmission member 11 attached to the rotating shaft, and the upper surface 19 of the outer cutter holder has a minute gap with the inner surface 20 of the central portion of the outer cutter 1. An electric shaver characterized in that the outer cutter is arranged so that the outer cutter comes into contact with the rotating shaft or the drive transmission member when the outer cutter deforms inward.