JPS6115796Y2 - - Google Patents

Description

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

〔the purpose〕

The purpose of this invention is to support the flexible outer cutter from the inside so that the outer cutter will not be damaged or plastically deformed due to repeated pressure or external impact force during daily use. It comes out.

[Prior art]

Traditionally, the outer blades of electric razors have often been formed into a thin foil shape, and in particular, the outer blades are made of flexible materials such as nickel or nickel alloy, and the outer blades can be easily removed by the pressure applied during shaving. Due to deformation, after being used several times, the mesh part of the outer cutter may break or otherwise break due to repeated bending or partial wear, and the inner surface of the outer cutter, which is sliding under pressure against the inner surface of the outer cutter, may become damaged due to repeated bending or partial wear. The blade hit, damaging both the outer and inner blades. Furthermore, when unnecessary external force is applied to the outer cutter, the outer cutter itself is plastically deformed, making it unusable. As a method for solving these drawbacks, a method as in Japanese Utility Model Application Laid-Open No. 126491/1983 has been proposed. In this proposal, when the outer cutter deforms inward, the center part of the outer cutter is moved to the stopper part formed on the inner cutter holder that holds the inner cutter, which is slid in pressure contact with the inner surface of the outer cutter, so as to be able to move up and down. By keeping the deformation of the outer cutter within the elastic limit and setting the amount of deflection of the inner cutter smaller than the amount of deformation of the outer cutter, both blades can be held without damage, but this is unnecessary for the outer cutter. The force applied to the blade 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 caves in. This reduces the contact force between the outer cutter and the inner cutter, making it impossible to maintain the shearing function. It disappears. In addition, when the inner cutter holder and the drive transmission member press-fitted into the motor rotation shaft engage, the play in this engagement part becomes large due to wear and depression when used for a long time while receiving the biasing force from the outer cutter. As the inner cutter holder rotates at an angle with respect to the outer cutter, 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 outer cutter is rotated due to the inclination. This caused uneven wear, reducing the strength of the outer cutter and causing it to break. In addition, in a structure where the outer cutter directly hits the stopper formed on the inner cutter holder, when a strong external biasing force is applied, the wide surface of the outer cutter hits the stopper, causing the inner cutter to rotate. This increases the load placed on the motor, which reduces its rotation speed and reduces its shearing function. On the other hand, if the stopper part and the outer cutter are configured to make point contact, since the outer cutter is formed into a thin foil shape, there is a drawback that the contact part is subject to damage such as deformation and tearing due to wear and impact. Ta.

〔composition〕

The electric shaver of the present invention is an electric shaver in which an inner cutter 5 slides in pressure contact with the inner surface of a flexible outer cutter 1, and the inner cutter 5 penetrates into the center of an inner cutter holder 6 in which the inner cutter 5 is held movably up and down. A rotary shaft 1 of a motor 9 has a hole 8 formed therein and rotates the inner cutter holder 6.
A drive transmission member 11 attached to the outer cutter 1 passes through the through hole 8, and its upper part is disposed with a slight clearance from the inner surface of the central part of the outer cutter 1, so that when the outer cutter 1 deforms inwardly, The through hole 8 of the inner cutter holder 6 is configured to abut against the drive transmission member 11.
A ring-shaped inner blade pressure adjustment screw 19 is screwed into the inner wall of the inner blade pressure adjustment screw 19 , the lower end of the inner blade pressure adjustment screw 19 is brought into contact with the outer peripheral stepped portion 21 of the drive transmission member 11 , and the inner blade pressure adjustment screw 19 is connected to the inner blade pressure adjustment screw 19 . This electric shaver is characterized in that it is disposed on the outer periphery of a drive transmission member 11.

〔Example〕

The present invention will be described in detail below based on an embodiment. FIG. 1 shows an embodiment of the present invention, and shows a cross section of the 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, as viewed from the motor side.

In FIG. 1, an outer cutter 1 made of a material such as nickel or a nickel alloy, such as a nickel-cobalt alloy, by a method such as electroforming and having a large number of hair introduction holes is clamped by an outer frame 2 and an inner frame 3. and
A concave portion 4 is formed in the center and has a substantially dome-like shape. A plurality of inner cutters 5 are arranged on the inner surface of the outer cutter 1 so as to be able to press and slide freely, and are biased and locked to an inner cutter holder 6 by an inner cutter spring 7 so as to be movable up and down. A through hole 8 is formed in the center of the inner blade holder 6 , and a drive transmission member 11 attached to the rotating shaft 10 of the motor 9 passes through the through hole 8 . In addition to guiding the centering, the lower end 13 of the through hole 8 of the inner cutter holder 6 also has a circular shape, just as the lower part 12 of the drive transmission member 11 has a shape with both sides of a circle cut off as shown in FIG. Since both sides of the drive transmission member 11 and the lower end 13 of the inner cutter holder 6 are engaged with each other, the rotational movement of the motor 9 is transferred to the inner cutter through the drive transmission member 11. The holder 6 is configured so that it can be transmitted to the inner cutter 5.

On the other hand, a central hole 16 is formed in the central concave portion 4 of the outer cutter 1, and the outer cutter holder is integrally formed with the outer cutter 1 by passing through the hole 16 and engaging the inner surface 15 of the concave portion 4 of the outer cutter 1 by means such as caulking. 17 is fixed. The lower end 18 of the outer cutter holder 17 has a through hole 8 formed in the inner cutter holder 6.
The upper part 14 of the synthetic resin drive transmission member 11 is inserted halfway inside and press-fitted onto the rotating shaft 10 of the motor 9.
is also inserted into the through hole 8, so that the lower end portion 1
8 and the upper part 14 have a fine gap (the optimal value is
0.5mm or less). Further, the outer cutter 1 of the inner cutter body 5 is disposed in the through hole 8 of the inner cutter holder 6.
A ring-shaped inner cutter pressure adjusting screw 19 for adjusting the pressure contact force against the inner cutter is screwed so as to be movable up and down, and its lower end 20 is in contact with the outer circumferential stepped portion 21 of the drive transmission member 11. When the pressure adjustment screw 19 is screwed in, the entire inner cutter holder 6 rises, and the contact pressure between the inner cutter 5 and the outer cutter 1 increases, and when the inner cutter pressure adjustment screw 19 is loosened in the direction of removal, the contact pressure decreases. Further, the inner blade pressure adjustment screw 19 is disposed on the outer periphery of the drive transmission member 11. Furthermore, by forming the outer blade holder 17 with synthetic resin and the drive transmission member 11 with metal (the opposite structure is the same), an outer blade holder structure with less wear and contact resistance is achieved. Also, the lower end 1 of the outer blade holder 17
If the contact surfaces between the upper part 14 of the drive transmission member 11 and the upper part 14 of the drive transmission member 11 are configured such that one side is a flat surface and the other side is a rounded surface, a point contact is formed, and the contact resistance becomes extremely small. Also, it is more effective to make both contact surfaces mirror surfaces. Also, outer blade holder 1
The upper part 22 of 7 has a brim shape, and its outer surface is exposed to the surface of the outer blade 1, so not only can characters etc. be engraved there, but if it is made of synthetic resin, it can be made into a colorful blade. This makes it very good in terms of design.

In each of the embodiments of the present invention, a large number of small holes are formed in the sliding area of the inner cutter 5 in the outer cutter 1. Elongated holes are arranged in a substantially radial manner (near the ends), and the long hairs that have entered the recessed portion 4 are cut by the elongated holes.

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

Note that 23 is an opening/closing tool which is pressed outward by a spring 24 to attach the inner frame 3 to the main body case 26. 25 is fixed to the main body case 26, and the opening/closing tool 2
3. An opening/closing tool holder that supports the spring 24.

〔effect〕

The present invention is constructed as described above, and if the outer cutter 1 does not receive an excessive force, the lower end 18 of the outer cutter holder 17 fixed to the inner surface 15 of the outer cutter 1 and the drive transmission member The upper part 14 of the blade 11 does not come into contact with each other, and the pressure contact between the outer blade 1 and the inner blade 5 is good, and the hair can be sheared without difficulty. Furthermore, even if the outer cutter 1 is subjected to an unexpected impact force or an excessive force of the outer cutter than necessary, the lower end portion 18 of the outer cutter 1 will deform only slightly, and then the lower end portion 18 will come into contact with the upper portion 14 of the drive transmission member 11, preventing further deformation. Therefore, the two blades 1 and 5 can be kept in good contact with each other. 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 holder 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 holder 6 due to external force applied to the outer cutter 1, and a good pressure contact state can be maintained permanently. Further, the lower end portion 1 of the outer cutter 1
8 is received by the upper part 14 of the drive transmission member 11, the amount of deformation of the outer cutter 1 due to external force is forcibly reduced, so the outer cutter 1 can be formed with a thin wall (about 60 to 90 μmm), which improves sharpness. Therefore, a close shave, which is an important characteristic, can also be improved. Furthermore, since the outer cutter 1 is made of metal, if the drive transmission member 11 is made of a synthetic resin material, wear and contact resistance can be reduced. Furthermore, if the contact surface of the upper portion 14 of the drive transmission member 11 with the lower end portion 18 is made into an R shape (R5 or more), not only will the contact resistance be reduced, but also the R surface will change when the outer cutter 1 receives more than necessary force. Since the entire outer cutter 1 is received, the durability of the outer cutter 1 is also improved. Furthermore, if the contact surface of the upper portion 14 with the lower end portion 18, the contact surface of the lower end portion 18, or both contact surfaces are mirror-finished, resistance can be further reduced and a smooth outer blade receiving structure can be achieved. Incidentally, since the outer cutter having a concave center is easily deformed, this effect is particularly large.

Furthermore, in the present invention, the arrangement of the inner cutter pressure adjustment screw 19 has been devised, so that the inner cutter pressure can also be adjusted.
That is, the inner blade pressure adjustment screw 19 is formed into a ring shape,
The inner cutter holder 6 is inserted into the outer periphery of the drive transmission member 11.
It is screwed into the inner wall of the through hole 8 in the center of the hole.
Therefore, the drive transmission member 11 is connected to the inner blade pressure adjustment screw 19.
Despite the arrangement, it penetrates through the central part and has a small gap with the outer cutter holder 17 on the inner surface of the outer cutter 1, and it goes without saying that the forcible deformation of the outer cutter 1 as described above can be prevented. , inner blade pressure adjustment screw 1
9 can also adjust the height of the inner cutter 5 with respect to the outer cutter 1, that is, the pressure contact force, by rotating it with a screwdriver or the like, and easily provides an electric shaver with excellent sharpness due to its simple structure.

[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, viewed from below. DESCRIPTION OF SYMBOLS 1... Outer blade, 2... Outer frame, 3... Inner frame, 4... Recessed part of outer cutter, 5... Inner cutter, 6... Inner cutter holder, 7
...Inner blade spring, 8...Through hole of inner blade holder, 9...
... Motor, 10 ... Rotating shaft, 11 ... Drive transmission member, 12 ... Lower part of drive transmission member, 13 ... Lower end of inner blade holder, 14 ... Upper part of drive transmission member, 15 ... Outer cutter Inner surface, 16...Central hole of outer blade, 17...Outer blade holder, 18...Lower end of outer blade holder,
19...Inner cutter pressure adjustment screw, 20...Lower end of inner cutter pressure adjustment screw, 21...Outer peripheral step of drive transmission member, 2
2...The upper part of the outer blade holder.

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 flexible outer cutter 1, a through hole 8 is provided in the center of an inner cutter holder 6 in which the inner cutter 5 is held movably up and down.
is formed, and the drive transmission member 11 attached to the rotating shaft 10 of the motor 9 that rotationally drives the inner cutter holder 6 passes through the through hole 8, and its upper part forms a fine gap with the inner surface of the central part of the outer cutter 1. The inner cutter pressure adjustment screw 19 is arranged in a ring shape on the inner wall of the through hole 8 of the inner cutter holder 6, and is configured to abut against the drive transmission member 11 when the outer cutter 1 deforms inwardly. are screwed together, and the lower end of the inner blade adjustment screw 19 is brought into contact with the outer peripheral stepped portion 21 of the drive transmission member 11,
The inner blade pressure adjustment screw 19 is connected to the drive transmission member 11.
An electric shaver characterized by being disposed on the outer periphery of the razor.