JPS6287185A - Inner blade of rotary electric razor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 【Technical field】

The present invention relates to the structure of an inner cutter of a rotary electric shaver.

[Background technology]

In the conventional rotary electric shaver, as shown in FIG. 11, the inner blade 2 and the push-up spring 1 are formed separately, so that the inner blade 2 is exposed to e during rotation. The rotational force of W (here, Q and o are the distances from the push-up spring 1 to the center of gravity of the inner blade 2, and W is the centrifugal force acting on the inner blade 2) acts, and the inner blade 2 rises and moves inside. There was a problem in that the adhesion between the blade 2 and the outer cutter deteriorated, resulting in a decrease in sharpness. Furthermore, the one shown in FIG. 12 is another conventional example in which a push-up spring 1 and an inner cutter blade 2 are integrally formed, and the push-up spring 1 is composed of a long arm portion 3 and a short push-up spring 1. Both the arm portion 3 and the push-up spring 1 have spring properties, but when the inner cutter blade 2 rises due to centrifugal force, the push-up spring 1 rises because force is applied in the torsional direction. However, since the arm portion 3 extends in the radial direction, its elasticity is weak in the direction in which the inner blade 2 rises, so it hardly shows any effect in preventing the inner blade 2 from rising. For this reason, in such a conventional example, there is a problem in that the inner blade 2 cannot be sufficiently prevented from rising due to centrifugal force, and the inner blade 2 tends to rise, and therefore the v! j The adhesion was poor and the electric razor was not sharp enough.

[Purpose of the invention]

The present invention was made in view of the above-mentioned technical background, and its purpose is to prevent the inner blade from rising due to centrifugal force, and to improve the adhesion of the inner blade to the outer blade. It's about making things better.

[Disclosure of the invention]

The inner cutter of the flexible electric shaver of the present invention is an inner cutter in which a push-up spring 1 and an inner cutter blade 2 are integrally formed, and the base layer portion of the push-up spring 1, which extends substantially along the rotational direction of the inner cutter, is rotated. It is formed into a substantially U-shape in a plane, and the end portion of this substantially U-shaped side is fixed to a portion 5 to be attached to the rotating shaft 4 via the arm portion 3, and the push-up spring 1 is It is characterized in that an inner blade 2 facing in a direction intersecting the plane of rotation is integrally formed at the tip. Therefore, the base end of the push-up spring 1 is formed into a substantially U-shape, and the tip of the push-up spring 1 and the tip of the arm portion 3 are not connected in a straight line, but connected in a detour. 1 can be made longer, the pushing force of the inner blade 2 by the push-up spring 1 can be improved, and the inner blade 2 can be brought into close contact with the outer blade 10 to improve sharpness. It is. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The inner cutter 11 includes an inner cutter base 6 made of synthetic resin and a cutter 12 made of steel or the like. As shown in FIG. 1, the cutter 12 has three arm parts 3 radially extending from a central part 13
A push-up spring 1 extends along the rotational direction of the inner blade.
The base end of the push-up spring 1 is bent into a substantially U-shape within the rotation plane, and the tip of the curved outer spring portion 14 of the push-up spring 1 is raised perpendicular to the rotation plane to form the inner blade. 2 is formed perpendicular to the plane of rotation, and the tip of the short inner spring portion 15 is integrally connected to the tip of the arm portion 3. Here, the tip of the outer spring [14] follows the inner blade 2 at a position eccentric to the outer circumferential side than the center of gravity of the inner blade 2. In addition, there is a push-up spring 1 at the center of the inner blade 2.
A slanted protrusion ff1s16 is provided on the opposite side surface. As shown in FIG. 2, the inner cutter base 6 has a mounting portion 5 for mounting the cutter 12 on the rotating shaft 4.
A fitting joint part 17 for fitting to the rotating shaft 4 is suspended from the lower surface of the center, an engaging protrusion 18 is protruded from the upper surface, and the cutter 12 is inserted into the fitting hole 19 of the center part 13. is inserted into the engagement protrusion 18 and fixed to the inner cutter base 6, and the inner cutter 1
1 is configured. Further, four groove-shaped inclined portions 8 are bored on the upper surface of the inner cutter base 6 in correspondence with the positions of the outer spring portions 14 of the push-up springs 1. It is inclined so that it is shallow on the spring part 15 side and gradually becomes deeper on the inner blade 2 side, and when a downward force is applied to the inner blade 2, the outer spring part 1 of the push-up spring 1
4 can sink into the inclined recess 8. As shown in FIG. 6, the green part of the inclined concave portion 8 serves as a guide portion 21 that guides the displacement of the push-up spring 1, and even if some external force acts on the push-up spring 1, the push-up spring 1 is protected by the side part 21. Further, as shown in FIG. 7, a rib 9 is made to protrude toward the inside of the inclined recess 8 so that the upper surface of the push-up spring 1 comes into contact with the deep end of the inclined recess 8. As shown in the figure, the inclined protrusion 16
A rib 9 is provided on the side so as to contact the upper surface of the inclined protrusion 16, and when the push-up spring 1 rises and tries to come out of the inclined recess 8, it hits both ribs 9 and stops, so that the strong external force is not applied internally. Even if it acts on the blade 2, the deformation of the push-up spring 1 is prevented by the rib 9, and a large positional displacement of the inner blade 2 does not occur, and the inner blade 2 and the outer blade 10 are always
At the same time, the push-up spring 1 is also protected from large deformation. Furthermore, as shown in FIG. 8, the inner blade 2 is supported by a fall prevention protrusion 22 provided on the deep side of the inclined recess 8 and is prevented from falling over a certain level. Therefore, the inner cutter 11 connects the fitting joint portion 17 to the motor 20.
The outer cutter 10 is attached to the rotating shaft 4 of the motor 20, and when the motor 20 rotates, the inner cutter blade 2 is
It slides while being pressed against the inner surface of the outer cutter 10 to cut the whiskers and the like introduced through the blade hole of the outer cutter 10. At this time, the arm portion 2 and the inner spring ff1S15 are in close contact with the inner cutter base 6 and their springiness is completely destroyed, but the outer spring portion 1
4 is in the inclined recess 8 and is in a state where it can exhibit elasticity, and when the inner cutter 11 rotates and a centrifugal force W is applied to the inner cutter blade 2, the inner cutter blade 2 is subjected to αW (t is a push force). A moment of IHM > between the lift spring 1 and the center of gravity of the inner blade 2 acts, but this moment acts as a torsional force on the outer spring portion 14 of the lift spring 1, so the rise of the inner blade 2 is small. Furthermore, since the tip of the push-up spring 1 is eccentric to the center of gravity of the inner blade 2, a moment of αW acts on the inner blade 2 due to centrifugal force, while the moment due to the push-up force by the push-up spring 1 is in the opposite direction. α+F (Il+ is the distance between the center of gravity of the inner blade 2 and the center of the tip of the push-up spring 1, and F is the push-up force of the push-up spring 1) acts on the blade, and the total moment becomes αW-a, F, and the total moment is small. Nate, inner blade blade 2
The rotation of the inner cutter blade 2 becomes smaller, and the adhesion of the inner cutter blade 2 becomes even better. Furthermore, since the push-up blade 2 is arc-shaped, the push-up spring 1 can be made long even in a small rotary blade, and an appropriate push-up force can be ensured. What is shown in FIGS. 9 and 10 is another example of the present invention, in which the inner cutter 11 is configured by not using the inner cutter base 6 but by making the joint part 7 hang down from the lower surface of the center of the cutter 12, The cutter 12 can be directly attached to the rotary cutter 4. In this embodiment, the width of the arm portion 2 is the same as that of the push-up spring 1.
The width of the arm 2 is extremely large compared to the width of the arm 2, and the arm 2 hardly deforms elastically, and is designed to resist the moment of centrifugal force by twisting the push-up spring 1. Effects of the Invention 1 As described above, the present invention provides an inner cutter in which a push-up spring and an inner cutter blade are integrally formed, and the base end of the push-up spring extending substantially along the rotational direction of the inner cutter is connected to a rotating plane. The upper part of the push-up spring is formed into a substantially U-shape, and the substantially U-shaped mounting is fixed to the part, and an inner blade facing in a direction intersecting the plane of rotation is integrally formed at the tip of the push-up spring. Therefore, the base end of the push-up spring is formed into a substantially U-shape, and the tip of the push-up spring and the tip of the arm portion can be connected in a detour instead of being connected in a straight line.
The length of the push-up spring can be made longer, which improves the pushing force of the inner blade by the push-up spring, and the inner blade can be brought into close contact with the outer blade to improve sharpness. There are advantages.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the present invention, Fig. 2 is an exploded perspective view of the same, Fig. 3 is a partially cutaway front view of the blade portion of the above, Fig. 14 is a plan view of the same, Figure 5 is a partially cutaway front view of the same as above, Figure tlS6 is a sectional view taken along line XX in Figure 4, and Figure 7 is... @ Y-Y cross section of figure 4, figure 8 is Z-X of figure $4
9 is a plan view showing another example of the present invention, FIG. 10 is a partially cutaway front view of the same, FIG. 11 is a sectional view of a conventional example, and FIG. Brown, leapfrog-11
Shikoku Togebowa-2 is an inner blade, 3 is an arm part, 4 is a rotating shaft, and 5 is a mounting part. Agent Patent Attorney Ishi 1) Ai 7Figure 1Figure 2Figure 10Figure 1!412Figure

Claims (6)

[Claims] (1) An inner cutter in which a push-up spring and an inner cutter blade are integrally formed, and the base end of the push-up spring extending substantially along the rotational direction of the inner cutter is formed into a substantially U-shape within the rotation plane. , the end of this approximately U-shaped side is connected to the tip of an arm extending from the attachment portion to the rotating shaft, and the tip of the push-up spring is oriented in a direction intersecting the plane of rotation. An inner blade of a rotary electric shaver, characterized in that the inner blade is integrally formed. (2) The inner cutter of a rotary electric shaver according to claim 1, wherein the attachment portion to the rotating shaft is constituted by an inner cutter base that supports a push-up spring. (3) The inner cutter of a rotary electric shaver according to claim 1, wherein the attachment portion to the rotating shaft is constituted by a joint portion formed integrally with the arm portion. (4) An inclined recess is formed in the inner cutter base to guide the displacement of the push-up spring, and a rib is provided to lock the tip of the push-up spring to prevent the inner cutter blade from lifting up. The inner cutter of a rotary electric shaver according to claim 2, characterized in that the inner cutter is made of a rotary electric shaver. (5) The inner blade of the rotary electric shaver according to claim 1, wherein the tip of the push-up spring is connected to the inner blade at a position displaced from the center of gravity of the inner blade. . (6) The inner blade of a rotary electric shaver according to claim 1, wherein the push-up spring is formed in an arc shape extending in the rotation direction of the inner blade.