JPH01110391A - Rotary electric shaver - Google Patents

Abstract

PURPOSE: To reduce the noise and abrasion of a supporting operation part by forming a plurality of projecting parts around a rotary shaft at the connecting part of a joint and a connecting boss and forming a supporting operation place in the rotating direction and pushing-up direction at these projecting parts. CONSTITUTION: The rotary shaft 10a is integrally formed nearly at the tip part of the joint 10 and three projecting parts 11 extending in the direction of a shaft line constitute a connecting part 12a in the state of a thick pawl surrounding it. Its one edge forms a slope 13a and the other edge is provided with an inner blade frame driving surface 14a. The joint 10 and the connecting boss 18 are fitted by connecting parts 12a and 12b to be in contact at respectively three surfaces of the slopes 13a, 13b, a driving surface and inner blade pushing up contact surfaces 15a and 15b both in the rotating direction and pushing up direction. When the pressurizing force of a skin is large, the floating of the outer blade 20 is also large and the inclination β of an inner blade frame 17 is also large. However, by fixing a stopper 21a, etc., supporting points are held at three points to distribute pushing up force added to the surfaces 15a and 15b to reduce the abration of the parts 12a and 12b.

Description

TECHNICAL FIELD The present invention relates to a rotary electric shaver having a floating shaving head, and more particularly to a rotary electric shaver with improved joints and connecting bosses.

(Background Art) A conventional rotary electric shaver having a floating shaving head is disclosed in Japanese Patent Publication No. 5B-4/9273, and is shown in FIGS. 6 and 7.

1 is a joint, and three claw-shaped connecting members 2 are formed at the tip of the joint 1, and these connecting members 2 are loosely fitted into three connecting ports 4 formed approximately in the center of a connecting piece 3. has been done.

Note that the connecting piece 3 and the inner cutter frame 5 are locked.

Therefore, as the joint 1 rotates, the connecting member 2 also rotates, and the connecting port 4 loosely fitted into the connecting member 2 follows the movement, causing the connecting piece 2, that is, the inner cutter frame 5 to rotate.

The support mechanism for pushing up the inner cutter frame 5 toward the outer cutter consists of a hemispherical pivot surface 6 formed approximately in the center surrounded by the connecting member 2 of the joint 1, and a hemispherical pivot surface 6 formed on the lower surface of the connecting piece 3. The protrusion 7 formed on the axis of rotation abuts and is supported at approximately one point.

For this reason, when the skin comes into contact with the outer cutter, the outer cutter floats and the inner cutter frame 5 tilts with respect to the joint l.As a result, the protrusion 7 formed below the connecting piece 3 is formed on the joint 1. The hemispherical pivot surface 6 formed on the hemispherical pivot surface 6 causes unpleasant noise to be generated, and the hemispherical pivot surface 6 formed on the protrusion 7 formed below the connecting piece 3 and the hemispherical pivot surface 6 formed on the joint 1. Since the surface 6 abuts at approximately one point and is supported so as to be pushed up toward the outer blade, there is a problem in that the friction between the two is large.

(Object of the Invention) The present invention aims to solve the above-mentioned problems, and includes a plurality of support functions in both the rotational direction and the push-up direction at the connecting portion between the joint and the inner cutter frame. A rotary electric shaver that can reduce noise generation and wear of the support mechanism for pushing up the inner cutter frame toward the outer cutter when the joint and the inner cutter frame are rotated by forming the joint and the inner cutter frame. is intended to provide.

(Disclosure of invention) The present invention will be explained below with reference to the drawings.

1 to 5 show a rotary electric shaver showing an embodiment of the present invention.

In FIG. 1, 10 is a joint, and a rotating shaft 10a is integrally formed approximately at the tip of the joint 10, and three convex portions 11 extending in the axial direction are formed around the rotary shaft 10a.
The connecting portion 12a has a thick claw shape and a substantially triangular shape.

One side of this convex portion 11 forms an inclined surface 13a, and the other side forms a driving surface 1 that rotates the inner cutter frame.
4a, and the apex formed by these two sides is the inner blade push-up contact surface 15a.

In addition, as mentioned above, the convex portion 1 formed around the joint 10
A projection 16 that is longer in the axial direction than the joint 10 and slightly tapered is formed at the axial center of the tip of the joint 10.

FIG. 2 shows the back side of the inner cutter frame 17 having an inner cutter blade (not shown), and shows that the connecting portion 12b of the connecting boss 18 that fits with the connecting portion 12a of the joint 10 is located approximately at the center of the inner blade frame 17. The connecting portion 12b of the connecting boss 18 has a substantially opposite shape to the connecting portion 12m of the joint 10, and the connecting portion 12b of the connecting boss 18 has a shape substantially opposite to that of the connecting portion 12m of the joint 10, and
3b, a hole 19 that constitutes the driving surface 14b and the inner blade push-up contact surface 15b, and that fits into the protrusion 16 of the joint 1O.
is formed.

FIG. 3 shows the fitted state of the joint 10 and the connecting boss 18, in which the joint 10 and the connecting boss 18 are fitted at the connecting parts L2a and 12b, and in both the rotational direction and the push-up direction.
The inclined surfaces 13a, 13b, and the N moving surface (not shown) are in contact with each other at three surfaces, ie, the inner blade push-up contact surfaces 15a, 15b.

In addition, when assembling the joint 10 and the connection boss 18, since the protrusion 16 formed on the joint 1O is longer than the convex part 11, it is first fitted into the hole of the connection boss 18 -1 and then the joint is assembled. 10 and the inclined surface 13 formed on each of the connecting boss 18
a, 13b, the respective connecting portions 12a, 12
b is in the fitted state.

FIGS. 4(a) and 4(b) are cross-sectional views of the tip of the rotary electric shaver during actual shaving.

In FIG. 5A, when the pressing force of the skin against the outer cutter 20 is small, the floating of the outer cutter 20 is small and the inclination α of the inner cutter frame 17 is also small.

Therefore, the joint 10 and the connecting boss 18 are held at three points, the inner blade push-up surfaces 15a and 15b, which are support points in the push-up direction, and are tilted together.

On the other hand, in FIG. 2B, when the pressing force of the skin against the outer cutter 20 is large, the floating of the outer cutter 20 is large and the inclination β of the inner cutter frame 17 is also large.

Therefore, the rotation axis between the joint 10 and the inner cutter frame 17 is tilted, and the inner cutter push-up surface 1 is located on the right side of the rotation axis as shown in the figure.
5a and 15b are separated, the support point in the upward direction of the inner cutter becomes one point on the left side of the rotation axis as shown in the figure, but if the downward floating of the outer cutter flow) 21 exceeds a certain level, it is regulated. By providing a sut bar 21a or the like as shown in FIG. Wear of the parts 12a and 12b can be reduced.

FIG. 5 shows an overall configuration diagram of the main parts of the electric shaver of the present invention. Reference numeral 22 denotes a housing, and an outer cutter frame 23 is detachably provided above the housing 22.

Reference numeral 24 denotes an outer cutter frame having an outer cutter 25. This outer cutter frame 24 is attached to an outer cutter float arm 26, and this outer cutter float arm 26 is urged upward by a spring 27. 10 is a joint whose tip protrudes from the opening 30 of the gear cover 29 and which connects to the connecting boss 18 of the inner cutter frame 17.
The inner cutter frame 17 is connected to the inner cutter frame 17 to transmit rotational motion to the inner cutter frame 17.

Further, the lower part of the joint 10 is loosely engaged with a drive gear 31, and an inner cutter frame push-up spring 32 for pushing up the inner cutter frame 17 toward the outer cutter is housed inside the joint 10.

Reference numeral 33 designates a motor provided within the housing body 22, and a pinion gear 35 is fitted onto its rotating shaft 34. This pinion gear 35 and the drive gear 31 are in mesh with each other, and the rotation of the motor 33 is controlled by the inner blade. 34 is configured to transmit the information to the inner cutter frame 17 provided with the cutter frame 17.

Note that there is little variation in the connecting parts 12a, 12b ((When the inner cutter frame is tilted greatly, the inner cutter push-up surfaces 15a, 15b
It has a flexible configuration in which it is supported at one point, and the other two points of the inner cutter push-up surfaces 15a, 15b are separated. ) Noise can be reduced.

Furthermore, since the protrusion 16 formed at the axial center of the tip of the joint 10 and the hole 19 formed in the connection boss 18 fit together to align the centers of their rotation axes, rotation loss due to eccentricity is avoided. can be reduced.

(Effects of the Invention) As detailed above, according to the rotary electric shaver of the present invention, there is an outer cutter having a writing hole, an inner cutter that comes into sliding contact with the inner surface of the outer cutter, and one end of which has the inner cutter. a joint connected to a connecting boss of an inner cutter frame and having the other end connected to a drive mechanism, and wherein the connecting boss is tiltable with respect to the joint; A plurality of convex portions extending in the axial direction are formed around the rotating shaft at the connecting portion with the connecting boss and are connected to each other, and the convex portions form supporting areas in both the rotational direction and the push-up direction. This makes it possible to reduce noise and wear of the supporting portion.

[Brief explanation of the drawing]

Figures 1 to 5 show a rotary electric shaver showing an embodiment of the present invention, in which Figure 1 is a perspective view of the joint, Figure 2 is a perspective view of the back side of the inner cutter frame, and Figure 3 is a perspective view of the joint. 4(a) and (b) are sectional views showing the inclination of the inner blade frame during shaving, and FIG. 5 is an overall configuration diagram of the main parts. 6 and 7 are diagrams showing a joint and an inner cutter frame of a conventional rotary electric shaver. 10...Joint, 11...Protrusion, 12a, 12
b...Connection part, 13a, 13b...Slope part,
14a, 14b ``drive surface, 15a, 15b...
Inner blade push-up contact surface, 16... protrusion, 17... inner blade frame, 18... connection boss, 19... hole,
20... Outer blade float, 21... Stopper. (1 other person) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Cause 6 Figure 7

Claims (2)

[Claims] (1) An outer cutter having a hair hole, an inner cutter that slides on the inner surface of the outer cutter, one end of which is connected to a connecting boss of the inner cutter frame having the inner cutter, and the other end of which is connected to a drive mechanism. In the rotary electric shaver, the coupling boss is tiltable with respect to the coupling, and the coupling boss is provided with a plurality of coupling parts extending in the axial direction around the rotating shaft. 1. A rotary electric shaver characterized in that a plurality of convex portions are formed and connected, and the convex portions form support areas in both the rotational direction and the pushing-up direction. (2) A protrusion that is longer in the axial direction than the plurality of protrusions extending in the axial direction formed around the joint is formed at the axial center of the tip of the joint, and the inner cutter frame is formed with the protrusion. The rotary electric shaver according to claim 1, further comprising a fitting hole.