JPS6373984A - Production of outer blade of electric razor - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an outer cutter of an electric shaver applied to a reciprocating electric shaver or a rotary electric shaver.

[Conventional technology]

As shown in FIG. 9, the outer blade of this type of electric shaver includes a rectangular foil-shaped outer blade base 82 having a large number of hair introduction holes 81, and both edges of the outer blade base 82 in the width direction (direction of arrow a). and a reinforcing plate 83 made of synthetic resin, for example, polysecure resin, which is outsert molded into the reinforcing plate 83, respectively.

[Problem that the invention seeks to solve]

By the way, conventionally, the reinforcing plate 83 extends from one end edge 81a to the other end edge 81b (in the longitudinal direction of the outer cutter base 81).
Since the shrinkage force (white arrow) of the resin constituting the reinforcing plate 83 is directly transmitted to the metal outer cutter base 81, the outer cutter base 81, which has low rigidity, is pulled in the direction of contraction. As shown in Figure 10, there is an inconvenient problem of deformation in a wavy manner.

[Means for solving problems]

Therefore, when reinforcing both widthwise edges of a foil-shaped outer cutter base with synthetic resin, the present invention involves forming a plurality of through holes intermittently along the longitudinal direction on both side edges, and then Reinforcement parts are formed by outsert molding with synthetic resin for each part of the hole, and locking parts are integrally molded on the reinforcement parts at both ends of the reinforcement part in the longitudinal direction. The above-mentioned drawbacks are solved by connecting with a contraction absorbing portion having a cross-sectional area smaller than the cross-sectional area in the width direction.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a rectangular foil-shaped outer blade base made of stainless thin steel plate or nickel electroformed plate, 2 is a large number of hair introduction holes formed in this outer blade base 1 by pressing, etching, etc., 3゜3 is the width direction of the outer cutter base 1 (arrow a
Synthetic resin reinforcing bodies 5 (5, to 54) formed on both side edges 4.4 of (direction) are formed integrally with each of the above-mentioned reinforcing bodies 3 in order to be engaged with an outer cutter holder (not shown). It is a locking piece.

The method for manufacturing the above outer cutter is as follows. First, a rectangular outer blade base 1 with a thickness of about 50 to 90 μm and having a large number of hair introduction holes 2 as shown in FIG. do. At this time, through holes 6 such as square holes are intermittently formed along the longitudinal direction at both side edges 4, 4 in the width direction of the outer cutter base body 1.

Thereafter, the outer cutter base 1 is inserted into a mold (not shown), and the location where the through hole 6 is formed is shown in FIGS. 3 and 4.
As shown in the figure, a reinforcing part 7 (71...7.) is formed by outsert molding a synthetic resin over both side surfaces, and a reinforcing part 7 (71...7.) is formed along one side of the outer blade base 1, for example, by being curved into an arcuate shape. Elastically deformable contraction absorbing section 8 (8,.

8□) is integrally formed between each of the reinforcing portions 7.

The shrinkage absorbing portion 8 is set to have a smaller cross-sectional area than the cross-sectional area of the reinforcing portion 7 in the width direction a. The reinforcing body 3 is constituted by the plurality of reinforcing parts 7 and the contraction absorbing parts 8.

As the synthetic resin, one having relatively high mechanical strength, such as polyacecool resin or polyethylene resin, is used. Of course, when forming the reinforcing portion 7, etc., the reinforcing portions at both longitudinal ends of the reinforcing portion 7? (7, 73) are also integrally formed with locking pieces 5 (51-54) for the outer cutter holder.

[Effect]

In the above configuration, both side edges 4, 4 of the outer cutter base 1 are connected to a plurality of reinforcing parts 7 and between these reinforcing parts 7, the outer cutter base 1
The shrinkage-absorbing portion 8 extending along one side of the holder prevents the holder from bending in either of the two lateral sides (in the direction of arrow C in FIG. 4). In particular, the shrinkage force of the resin during molding of the reinforcing part 7 is small, and the shrinkage absorbing part 8 absorbs this shrinkage force by deforming as shown by the broken line in FIG. The problem of the both side edges 4, 4 being pulled and deformed into a wavy shape is also solved.

[Other Examples]

By the way, the through hole 6 is not limited to a square hole (it may also be a round hole as shown in FIG. 6).

When the hole is formed into a round hole, the contraction force around the round hole 6 in the reinforcing portion 71 applies a large tension force to the locking piece 51 that is integrally formed with the reinforcing portion 71. The locking elasticity P when locking to the holder can be strengthened. Further, each reinforcing portion 7 may extend from one side of the outer cutter base 1 to the other side through the side edge in order to disperse the shrinkage direction of the resin, as shown in FIG.

In the above embodiment, the shrinkage absorbing portion 8 is present only on one side of the outer cutter base 1, but if it is also present on the other side, a reinforcing effect can be effectively achieved. In that case, the 8th
As shown in the figure, the shrinkage absorbing portion 8''(s'+) is located on the other side of the outer blade base 1.

8"2), the contraction absorbing portion 8 (8I,
If it is set in the opposite direction to the bending direction of 8□), the reinforcing effect will be further improved. Of course, the curved shape of the contraction absorbing portion 8 is not limited to an arcuate shape, and may be appropriately selected such as a dogleg shape or an S shape.

〔Effect of the invention〕

As described in detail above, according to the present invention, when reinforcing both widthwise side edges 4, 4 of the foil-like outer cutter base 1 with synthetic resin, the side edges 4.4 are reinforced along the longitudinal direction. After forming a plurality of through holes 6 intermittently, each of the through holes 6 is
The reinforcing portions 7 are formed by outsert molding with synthetic resin for each portion, and the locking portions 5 are integrally molded on the reinforcing portions 7 at both longitudinal ends of the reinforcing portions 7.
Since the gaps are connected by the shrinkage-absorbing part 8 having a cross-sectional area smaller than the cross-sectional area in the width direction of the reinforcing part 7, warpage occurs due to the shrinkage force of the resin during molding.

Deformation can be prevented and the outer blade base can be appropriately reinforced regardless of this shrinkage force.Furthermore, since each reinforcing part 7 and the shrinkage absorbing part 8 are formed by simultaneous molding, productivity can be improved and the dimensions of the mounting position can be reduced. It is possible to provide a method for manufacturing the outer blade of an electric shaver that can improve precision.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the outer cutter of an electric shaver obtained by the present invention, FIGS. 2 to 4 are explanatory diagrams of a method for manufacturing the same outer cutter, and FIG. 4 is shown in FIG. IV line sectional view, 5th
Figures 7 and 6 are explanatory views of the main parts, Figures 7 and 8 are
The figure is an explanatory diagram of a modified example of the main part, and FIGS. 9 and 10 are explanatory diagrams of a conventional example. 1...Outer blade base 3...Reinforcement body 4.4...Both side edges 6...Through hole 7 (7, 7□, 73)...Reinforcement part 8 (8')...・Shrinkage absorption part. Applicant Kyushu Hitachi Maxell Co., Ltd. Representative Takashi Fukuhara - Figure 1 Figure 2 y! 4 `` 4 ? Figure 5 Figure 6 Tough 78・〈 Drawing 8 (No change in content) Figure 9 Figure 1 Q Procedural amendment (method) % formula % 2. Name of invention Outer blade of electric shaver Manufacturing method 3, Relationship with the case of the person making the amendment Patent applicant address 4680-4 Ikata, Katashiro-cho, Tagawa-gun, Fukuoka Prefecture Date of amendment order August 25, 1985 5 Subject of amendment (1) Figure Aspect 6, Contents of amendment (]) First, amend Figure 9 of the drawing as shown in the attached sheet.(Otsu 7,
Transcript of attached documents (1) One or more copies of corrected drawings

Claims (1)

[Claims] (1) When reinforcing both widthwise side edges 4, 4 of the foil-shaped outer cutter base 1 with synthetic resin, a plurality of through holes 6 are intermittently formed along the longitudinal direction on both side edges 4, 4. After that, each part of each of the through holes 6 is outsert molded with synthetic resin to form a reinforcing part 7, and the locking part 5 is integrally molded on the reinforcing part 7 at both longitudinal ends of the reinforcing part 7. A method for manufacturing an outer blade of an electric shaver, in which each reinforcing part 7 is connected by a contraction absorbing part 8 having a cross-sectional area smaller than the cross-sectional area in the width direction of the reinforcing part 7.