JPH0214750Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a drive pole device for an electric shaver that transmits rotation from a drive motor to an inner cutter.

(Prior Art) An electric shaver, especially a triple round blade type electric shaver, is equipped with inner and outer cutters arranged at the vertices of an equilateral triangle, and each inner cutter is rotationally driven by a drive pole device with one end engaged with the inner cutter. I am forced to do it. On the other hand, each drive pole device has a gear at the other end, and each gear is rotationally driven by a pinion fixed to the shaft of a drive motor disposed at the center.

By the way, since the outer cutter needs to be in close contact with the shaving surface, the inner and outer cutters are usually supported so that they can be tilted and moved forward and backward with respect to the shaft.

Therefore, the conventional driving pole device includes at least a gear part, a stop part integrally molded or integrally connected to the gear part, and a pawl part separate from these parts, and a spring is compressed into the inside of the pawl part. At the same time, the pole part is elastically supported so as to be relatively expandable and swingable inside the shaft stop part, and on the other hand, for example, a recess provided on the pole part side and a vertical rail part provided on the shaft stop part side are engaged with each other. A configuration is adopted in which both can rotate together in the rotational direction.

(Problems to be Solved by the Invention) However, the conventional drive pole device has the following problems.

That is, since the stop shaft portion and the pawl portion are provided with engagement means that can rotate together in the rotational direction, it is necessary to align the two during assembly. Therefore, assembly is difficult and assembly efficiency is significantly reduced. Moreover, this has led to considerable complexity in automation, and the reality is that automation is not easy to implement.

In addition, the pole part is assembled with a spring inside it, and is also fitted against the retaining part of the stopper part, which makes assembly even more difficult.

Therefore, this invention aims to dramatically improve the ease of assembly,
Furthermore, the present invention provides a driving pole device for an electric shaver that can be easily automated in assembly.

(Means and operations for solving the problems) The present invention relates to a driving pole device 2 particularly shown in FIG. cylindrical pole part 5,
and a spring portion 6.

The gear part 3 has a cylindrical part 32 with an upward opening formed on the upper end surface of the gear 31, and an inner circumferential surface 32a of the cylindrical part 32.
A spline-shaped portion 34 having a pointed protrusion 33 at the upper end is provided. The stopper part 4 has an outer circumferential surface 41 having approximately the same diameter as the inner diameter of the cylindrical part 32, and an inner circumferential surface 42 with a non-circular cross section. At the same time, a groove 44 is formed on the outer circumferential surface 41, and a spline-shaped part 46 having a pointed protrusion 45 at the lower end that fits into the spline-shaped part 34 is provided. It is held inside the section 32. The cylindrical pole portion 5 opens downward, and has a peripheral edge approximately in the same shape as the non-circular inner circumferential surface 42, and has an edge that is similar to the inner protruding edge 4.
3 is provided at the lower end with an engaging flange 51 that engages with the holder 3. Also, at the upper end is an engagement shaft 52 that extends upward and engages with the inner cutter.
is provided, thereby allowing it to be vertically slidably inserted into the stop tube portion 4. The spring portion 6 is inserted into the pawl portion 5, and its lower end is pressed against the upper end surface of the gear 31.

Therefore, when assembling, as shown in FIG. 2, the pole part 5 is inserted from below the stopper part 4, and then the spring part 6 is inserted from below into the inside of the pole part 5. In this state, the stop barrel portion 4 is attached to the gear portion 3.
If inserted into the cylindrical part 32 from above at any position, the protrusions 33,
Automatically aligned by the action of the pointed shape of 45,
It can be assembled with one touch. Further, according to a preferred embodiment, the retaining means 7 is attached to the cylindrical portion 32.
If the pawl portion 5 is configured by a locking projection 38 provided at the upper end of the pole portion 5, the pole portion 5 will be automatically held after assembly due to the elastic action of the locking projection 38. As a result, the spline-shaped portions 34 and 46, the non-circular inner circumferential surface 42, and the engaging collar 5
1, the gear part 3 and the pawl part 5 can rotate together, and at the same time, the pawl part 5 can move forward and backward and swing relative to the gear part 3.

(Embodiments) Below, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a vertical cross-sectional front view of the drive pole device according to the present invention, Fig. 2 is an exploded vertical cross-sectional front view of the device, Fig. 3 is a bottom view of the stopper tube portion, and Fig. 4A is the stopper tube portion. Figure B is a perspective view showing a part of the inner peripheral surface of the cylindrical part.

First, the gear part 3 is a gear 31 with teeth formed on the circumference.
A cylindrical part 32 coaxially integrally formed with this gear 31
Equipped with. A tubular shaft bearing part 35 is integrally formed in the center of the gear 31 and penetrates vertically in the axial direction, and a cam part 36 is integrally provided on the outer peripheral surface of the shaft bearing part 35 that projects downward. This cam portion 36 is used to drive the hair cutting portion 8 (see FIG. 6) that reciprocates the blade. On the other hand, the upper end of the shaft bearing part 35 protruding upwardly has the same height as the substantially cylindrical part 32, and supports the spring part 6. As shown in FIG. 4B, the cylindrical portion 32 has a spline-shaped portion 34 formed on its inner circumferential surface 32a, particularly on the circumferential surface of the lower half. And ridge 33...
The upper end of is formed into a pointed shape. Further, the cylindrical portion 32 is partially vertically divided to form elastic pieces 37, and a locking protrusion 38 is formed on the upper end of the inner wall. The locking protrusion 38 has a shape that prevents the locking tube portion 32 from coming off even though the locking tube portion 32 is easily inserted into the cylindrical portion 32 by the action of the elastic piece 37.

Further, the length of the locking cylinder portion 4 is desirably made approximately equal to the distance between the upper end surface of the gear 31 and the lower end of the locking protrusion 38 . Further, the outer diameter of the stopper part 4 is equal to the diameter of the cylindrical part 3.
2, and the outer circumferential surface 41 has the diameter A shown in FIG.
A spline-shaped part 46 is formed by leaving a part of the upper part as shown in FIG. This shaped portion 46 is formed by a groove 44 so as to fit into the spline shaped portion 34, and the lower end of the convex strip 45 formed thereby is formed into a pointed shape. Further, as shown in FIG. 3, the non-circular inner circumferential surface 42 is formed, for example, in a substantially octagonal shape.
An inner protruding edge 43 is formed at the upper end of the inner peripheral surface 42 so that a circular hole 47 opens at the center.

On the other hand, the cylindrical pole part 5 has an outer diameter smaller than the circular hole 47, and has an engaging flange 51 on its lower outer circumferential surface that has approximately the same circumferential shape as the non-circular inner circumferential surface 42, and has a tapered upper end. An engagement shaft 52 having a relatively small diameter is integrally formed upwardly via the engagement shaft 53. Engagement shaft 5
The upper end of 2 has a non-circular cross-section engaging part 54 for the inner cutter.
form. The pole portion 5 opens downward, and a rib-shaped spring receiver 55 is formed at the upper portion of the inside.

Further, the spring portion 6 is specifically a coil spring 61, and its length is selected so that it can be assembled in a compressed manner.

Each part has been described in detail above, but the gear part 3, stopper part 4, and pole part 5 are each integrally molded from synthetic resin, and unnecessary parts are removed as necessary to save material.

Next, the assembly procedure will be explained.

First, the pole part 5 is inserted from below the stopper part 4. In this case, the engaging flange 5
1 positioning is required, but it is a simple assembly of individual parts, and the polygonal shape allows for easy assembly. Next, coil spring 6
One end of the spring 61 is inserted into the inside of the pole part 5, and the other end of the spring 61 is inserted into the shaft bearing part 35.
Then, in this state, if the stop cylinder part 4 is pushed into the cylindrical part 32, the assembly is completed. At this time, there is no need for alignment at all because the spline-shaped portions 34, 46 are automatically fitted together by the action of the pointed shapes of the protrusions 33, 45. Also, when pushing the stopper part 4,
The locking protrusion 38 expands outward due to the elastic action of the elastic piece 37 and does not prevent the insertion of the stopper cylinder 4. After assembly, the locking protrusion 38 locks the upper end of the stopper cylinder 4 and has a retaining function. Motsu.

Note that the retaining means 7 is attached to the retaining tube portion 4 to the cylindrical portion 32.
This may also be done by press-fitting and fixing.

Next, FIGS. 5 and 6 show the structure of a suitable electric shaver using such a drive pole device 2.
This will be explained with reference to the figures. Fig. 5 is an exploded perspective view showing the drive device and head device of the electric shaver;
The figure is an external side view of the electric shaver.

In FIG. 5, 70 is a drive unit holding stand.
A motor 71 is held on the lower surface, and a pinion 72 is fixed on the shaft by protruding to the upper surface. Further, three pins 73 are arranged facing each other at equal intervals around the pinion 72 on the upper surface of the holding table 70. The support portion 35 of the drive pole device 2 according to the present invention is rotatably supported on each pin 73 . A blade holder 74 is arranged above the holder 70, and a plurality of locking arms 75 provided on the blade holder 74 are connected to the holder 70.
It is integrated by locking on the outer edge of the. At this time, the holding stand 7
A felt holding plate 76 is interposed between the felt holding plate 76 and the blade holder 74, and felt 77 . . . is interposed between the felt holding plate 76 and the blade holder 74. The integrated drive device 90 is constructed as described above, and the thus assembled product is assembled to the main body 91 of the electric shaver 1 shown in FIG. 6.

The material of the felt holding plate 76 is selected, and a locking post 78 having appropriate elasticity is provided extending upward from the outer edge of the locking post 78.
. . . allows the head device 79 to be attached to and removed from the blade holder 74 in a click-type manner. Head device 79
consists of a blade frame 80 and a blade holding plate 81 that holds the inner and outer blades. In FIG. 6, 82 indicates an outer cutter.
In the figure, 8 is a hair cutting section, and 83 is a power switch.

This kind of electric shaver is easy to assemble as a whole and incorporates ideas for reducing costs.

Although the embodiments have been described above, the present invention is not limited to such embodiments, and the detailed shape (for example, the shape of the non-circular inner circumferential surface of the stopper part), structure,
Arbitrary changes in arrangement and quantity (number of protrusions on the spline portion, etc.) that do not depart from the gist of the present invention are permitted within the scope of the present invention.

(Effect of the invention) As described above, the driving pole device for an electric shaver according to the present invention is provided with a spline-shaped part having a convex ridge with a pointed tip, and also has a non-circular peripheral surface between the stopper part and the pole part. Since they are connected together, assembly is extremely easy. In particular, this type of pole device, which is assembled by inserting a spring, is extremely complicated to assemble when positioning etc. are included, resulting in a significant decrease in assembly efficiency.However, the device of the present invention can resist the elasticity of the spring and perform positioning during assembly. is completely unnecessary,
Furthermore, the ease of assembly can be dramatically improved as it can be performed with one touch, and assembly automation can be facilitated, leading to significant cost reductions.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional front view of the drive pole device according to the present invention, Fig. 2 is an exploded vertical cross-sectional front view of the device, Fig. 3 is a bottom view of the stopper tube portion, and Fig. 4A is the stopper tube portion. FIG. 4B is a perspective view showing a part of the inner peripheral surface of the cylindrical part, FIG. 5 is an exploded perspective view showing the drive device and head device of the electric shaver, and FIG. is a side view of an electric razor. In the drawings, 1... electric shaver, 2... drive pole device, 3... gear section, 4... stop tube section, 5...
Cylindrical pole part, 6... Spring part, 7... Retaining means, 31... Gear, 32... Cylindrical part, 3
2a...Inner circumferential surface, 33...Convex strip, 34...Spline shaped portion, 41...Outer circumferential surface, 42...Non-circular inner circumferential surface, 43...Inner projecting edge, 44...Groove, 45... …
Convex strip, 46... Spline shaped portion, 51... Engagement collar, 52... Engagement shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A driving pole device for an electric shaver consisting of the following parts. (a) A gear part in which a cylindrical part with an upward opening is formed on the upper end surface of the gear, and a spline-shaped part having a pointed upper end protrusion is provided on the inner peripheral surface of the cylindrical part. (b) An inner peripheral surface having an outer circumferential surface having approximately the same diameter as the inner diameter of the cylindrical portion and a non-circular inner circumferential surface having a non-circular cross-sectional shape, and an inner protruding edge protruding inward at the upper end of the inner circumferential surface. and a spline-shaped part having a groove on the outer peripheral surface and a sharp protrusion at the lower end into which the spline-shaped part is fitted, and the stopper part is held inside the cylindrical part by a retaining means. (c) A peripheral edge is formed in substantially the same shape as the non-circular inner circumferential surface, an engaging collar is provided at the lower end so that the edge engages with the inner protruding edge, and an engaging collar is provided at the upper end that extends upward to form an inner cutter. (d) a cylindrical pole portion with a downward opening, which is provided with an engagement shaft and is slidably inserted into the stop cylinder portion in a vertically slidable manner; (d) a spring portion which is installed inside the pole portion and whose lower end is in pressure contact with the upper end surface of the gear; 2. The electric shaver according to claim 1, wherein the retaining means is provided with a locking protrusion at the upper end of the inner circumferential surface of the cylindrical portion, and locks the upper end of the locking tube portion. driving pole device.