JPH0123404Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a mounting structure for a thin metal plate applied to a push-up spring of an electric shaver, etc.

[Background technology]

The inner cutter body of a rotary electric shaver usually has a slit 2 in an inner cutter frame 1 as shown in Figures 1 and 2.
The inner cutter 3 is passed through the slit 2, and the base end 4a of the push-up spring 4 is attached to the back surface of the inner cutter frame 1 to support the inner cutter 3 at its tip.

The structure for attaching this push-up spring 4 to the inner cutter frame 1 is as shown in FIG.
A boss 6 is provided on the inner cutter frame 1, a boss 6 is provided in the opening hole 5, the boss 6 is press-fitted into the opening hole 5 (see figures a to c), and the boss is crimped with pressure using a crimping punch 7. The tip of 6 was pressed and fixed as shown in the figure d. However, since the boss 6 is made of synthetic resin and the push-up spring 4 is made of metal, the boss 6 made of synthetic resin may be scraped by the push-up spring 4 made of a thin plate due to misalignment and tightness between the two when press-fitting. The shavings 8 get caught between the support surface 9 and the push-up spring 4, making it impossible to press-fit the push-up spring 4 to a predetermined position, resulting in a gap H.

In order to solve this problem, it has been devised to form a recess 10 at the base of the boss 6 to accommodate the shavings 8, as shown in FIG. However, when the synthetic resin boss 6 is caulked by pressure P, there is a problem in that the push-up spring 4 is deformed by the recess 10 as shown in FIG. 4c. Therefore, the spring characteristics of the push-up spring 4 change, the pressing force of the inner cutter against the outer cutter changes, and the sharpness of the whiskers changes. Furthermore, the problem of deformation occurs not only when the push-up spring 4 is used but also when a thin metal plate is attached to the boss.

[Purpose of invention]

Therefore, an object of this invention is to provide a thin metal plate mounting structure that allows the thin metal plate to be press-fitted into a predetermined position and prevents the thin plate from being deformed.

[Disclosure of invention]

This idea forms a non-contacting part on the peripheral surface of the synthetic resin boss that does not come into contact with the edge of the opening hole in the thin metal plate, and a support surface is formed at the base of the boss at a position corresponding to the non-contacting part. The feature is that a recess for accommodating shavings is formed in the other part. The shavings generated by press-fitting the thin metal plate are stored in the recess,
Further, since the pressure during pressure caulking is supported by the support surface, there is no deformation as shown in FIG. 4c.

An electric shaver to which the first embodiment of this invention is applied is shown in FIGS. 5 to 17. That is, 1
1 is a main body housing, 12 is a motor, 13 is a joint provided on the motor shaft 14, 15 is an inner blade attached to the joint 13, and 16 is a push-up supported by the synthetic resin frame 15a of the inner blade 15. spring, 17
18 is an inner cutter passed through the slit 15b of the frame 15a and supported by the push-up spring 16; 18 is an outer cutter frame screwed onto the upper end of the main body housing 11;
Reference numeral 19 denotes an outer cutter that circumscribes the inner cutter 17. When the motor 12 is activated by a switch (not shown), the inner cutter 17 rotates via the joint 13, the frame 15a, and the push-up spring 16, and its cutting edge is rotated. slides on the inner surface of the outer cutter 19, and enters a shaving operation state in which the hair that enters through the cutter hole of the outer cutter 19 is cut. Note that the shaved beard debris is stored in the beard debris reservoir 20.

Now, the push-up spring 16 has an arcuate plate shape as shown in FIG.
6a, and a pair of circular opening holes 21 as shown in FIGS. 11 and 12 are formed at the base end. Further, as shown in FIGS. 8 and 9, on the back surface of the frame 15a to which this is attached, a boss 22 having a substantially triangular cross section and an arcuate top is integrally formed by molding means, and the top of the boss 22 abuts the opening hole 21. portion 23, and the straight portion becomes a non-contact portion 24 that forms a gap with the opening hole 21. In addition, a ring-shaped support surface 22' is formed at the base of the boss 22, and the position of the abutting part on the inside thereof is defined as a shavings storage recess 25, and the non-contacting part 24
A rib-shaped support surface 26 is formed on the surface.

FIG. 14 shows the installation process of the push-up spring 16,
Figure a shows a state in which the opening hole 21 faces the boss 22;
Figures b and c and Figure 13 show the press-fitting process, at which time the abutment portion 23 of the boss 22 is
is scraped, and the shavings 27 may be generated, but they are stored in the shavings storage recess 25. Therefore, the push-up spring 16 can be accurately press-fitted to the position of the support surface 26. Figures d and e show the process of pressing and caulking the tip of the boss 22 with the caulking punch 7, and the push-up spring 16 is pressed against the support surface 26 and fixed by the pressing portion 28 formed by caulking. Since the push-up spring 16 is supported by the support surface 26 in this manner, the push-up spring 16 is not deformed as shown in FIG. 4c, and the spring characteristics can be guaranteed.
Note that FIGS. 15 to 17 show the installed state.

A second embodiment of this invention is shown in Figures 18 to 2.
Shown in Figure 2. That is, the opening hole 21' of the boss 22a is triangular instead of having a circular cross section. In this case, press fit so that the top of the triangle that will become the non-contact part 24 is on the support surface 26, and caulk the boss 22a, the shavings 27 will be removed from the accommodation recess 25.
Since it is housed in the holder, it can be press-fitted into a fixed position, and since it is supported by the support surface 26, no deformation occurs.

In addition, although the above-mentioned embodiment explained the attachment of the push-up spring 16, the attachment is not limited to this, and any thin metal plate may be used.

[Effect of idea]

As described above, according to the thin metal plate mounting structure of this invention, when a thin metal plate is attached to a synthetic resin boss, it can be easily mounted in a fixed position without deformation.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the inner blade of the electric shaver, Figure 2
The figure is a bottom view, Figure 3 is a cross-sectional view showing the process of installing the push-up spring, Figure 4 is a cross-sectional view of the installation process of an improved example, and Figure 5 is an electrical A sectional view of the main parts of the razor, FIG. 6 is a perspective view of the inner blade, FIG. 7 is a bottom view, FIG. 8 is an enlarged plan view showing the push-up spring attachment part, and FIG. 9 is the - line. 10 is a sectional view taken along the line of FIG. 8, FIG. 11 is a partial plan view of the base end of the push-up spring, FIG. 12 is a sectional view thereof, and FIG. 13 is a press-fitted state of the push-up spring. Fig. 14 is a sectional view of the push-up spring installation process, Fig. 15 is a plan view of the completed installation state, Fig. 16 is a sectional view taken along the line
Fig. 7 is a sectional view taken along the - line in Fig. 15, Fig. 18 is an enlarged plan view of the boss portion in the second embodiment, Fig. 19 is a sectional view taken along the - line, and Fig. 20 is a view of the mounting portion of the push-up spring. A partial plan view is shown, FIG. 21 is a sectional view thereof, and FIG. 22 is a plan view of the press-fitted state of the push-up spring. 16... Push-up spring (thin metal plate), 21,2
1'...opening hole, 22, 22'...boss, 23...
Contact part, 24, 24'...Non-contact part, 25...Shavings storage recess, 26...Rib-shaped support surface, 27...
...Shavings, 28...Pressed part.

Claims (1)

[Scope of utility model registration request] A thin metal plate having a mounting hole formed therein, and a synthetic resin boss that fits into the mounting hole and has a non-contacting part on the circumferential surface that does not touch the edge of the hole, and the boss A supporting surface for supporting the fitted position of the thin metal plate is formed at a position corresponding to the non-contacting part at the base of the boss, and further at a position corresponding to the non-contacting part at the base of the boss. and a mounting base formed with a recess for accommodating shavings, and a mounting structure for a thin metal plate that is pressure-impregnated onto the thin metal plate by pressure caulking the tip of the boss.