JPH0316601Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an outer blade body of a rotary razor in which the outer blade holder is made of synthetic resin.

[Conventional technology]

As shown in Fig. 1, the outer blade body of the rotary razor consists of a metal frame 1 with an annular step 1' formed on the inner wall, and a dome-shaped outer blade 2 with a number of hair introduction holes formed therein.
The peripheral edge 3 of the metal frame 1 is secured to the metal frame 1.
A structure is known in which a metal frame 4 having an annular step 1' and a polymerizable annular step 4' is press-fitted and fixed. However, this structure requires a high degree of dimensional accuracy between the metal frame 1 and the metal frame 4, which has the disadvantage of increasing costs.

[Problem that the invention attempts to solve]

In view of these drawbacks, in order to provide a rotary razor that is easy to manufacture, inexpensive, and has a variety of designs, the outer blade holder is made of synthetic resin, and the outer blade holder and dome-shaped outer blade are made of synthetic resin. An outer blade body is known in which both are simultaneously formed and integrated. However, in this case, the outer cutter becomes brittle and shrinks due to temperature changes, and the curvature of the dome-shaped outer cutter changes to protrude further outward, leading to deterioration of sharpness and increased noise due to poor contact with the inner cutter. An inconvenient problem was occurring.

[Means for solving problems]

Therefore, in this invention, a plurality of notches are provided in the peripheral flange of a dome-shaped outer cutter in which a number of whisker introduction holes are formed, and a plurality of notches are provided in the inner step of a synthetic resin outer cutter holder that supports the outer cutter in a stretched manner. At a position facing the notch, a convex portion is provided that is smaller than the notch size of the notch and larger than the thickness of the peripheral flange, and when the peripheral flange is in contact with the inner step, the convex portion is provided. The protruding part is made to protrude through the notch, and the protruding part is ultrasonically welded to a synthetic resin annular member that is inserted from below toward the inner step, thereby forming a gap between the inner step and the annular member. When fixing the synthetic resin outer cutter holder and the dome-shaped outer cutter by clamping the peripheral flange of the outer cutter, a separate synthetic resin annular member was welded using ultrasound. Since the outer cutter 6 does not act, it is not welded to either the inner step 8 or the annular member 7, and the protrusion 9 and the annular member 7 are directly welded, and the welding force is applied to the peripheral flange 11 of the outer cutter 6. To provide an outer cutter body that can be clamped without being applied directly, and therefore can obtain good sharpness without changing the curvature of the dome-shaped outer cutter. In particular, the welding between the protruding portion 9 and the annular member 7 is performed within the notch 12 provided in the peripheral edge flange 11 of the outer cutter 6, and the peripheral edge is welded at a location other than the welding between the two, that is, at a location where welding deformation has not occurred. Tsuba 1
1 is clamped, the clamping accuracy is high, and the notch size of the notch 12 is larger than that of the protruding part 9, so the welded deformed part of the protruding part 9 is unnecessarily attached to the peripheral flange 11.
It can be installed securely without putting pressure on it.

〔Example〕

This invention will be explained below based on the drawings.

As shown in FIGS. 2 and 3, an annular inner step 8 is provided on the inner wall of the outer cutter holder 5 made of synthetic resin such as polyacetal, and this inner step 8 has a convex portion 9.
Many have been established. The protrusions are arranged at equal intervals of, for example, 30 degrees, resulting in 12 protrusions.
In addition, the dome-shaped outer blade 6 is formed by press molding or electroforming of a stainless steel thin copper plate, and the dome-shaped outer blade 6 is formed by press molding or electroforming.
Many 0's are formed. A notch 12 is provided in the peripheral edge flange 11 of the dome-shaped outer cutter 6 at a position facing the protrusion 9 provided upright on the inner step 8 of the outer cutter holder 5. The thickness of the portion 9 is larger than that of the flange 11, and with the peripheral flange 11 in contact with the inner step 8, the convex portion 9 protrudes to the lower surface side through the notch 12, so that both It plays the role of position fixing when 8 and 11 are polymerized. The outer cutter 6 is sandwiched between an outer cutter holder 5 and an annular member 7 made of synthetic resin such as polyacetal, and by ultrasonically welding the protruding portion 9 of the outer cutter holder 5 and the annular member 7, the outer cutter 6 is formed into a dome shape. The peripheral flange 11 of the blade 6 is clamped and fixed.

In this case, while the protruding portion 9 has a triangular cross section, the annular member 7 has a rectangular cross section, so the ridgeline position will be in contact during ultrasonic welding, as shown in Figure 3. Improves welding performance.

In addition, since the length b of the notch 12 in the circumferential direction is sufficiently larger than the width a of the protrusion 9, the outer cutter 6 can be attached to the outer cutter holder 5 and temporarily positioned, so that the two do not match each other. This simplifies the assembly process and improves the ease of automatic assembly when using a robot.Moreover, the difference in length acts as a space for resin to escape due to deformation of the convex portion 9 during welding. The welded deformed portion does not unnecessarily press the peripheral flange 11 and the annular member 7 is tightly held on the peripheral flange 1 of the outer cutter.
1 can be prevented from shaking in the vertical direction, and the resin filling this relief space can also be used to prevent the outer cutter 6 from rotating. Furthermore, if the notch 12 of the peripheral flange 11 is not in a closed hole shape but in an open shape toward the outer cutter, the outer cutter may have been pressed by an ultrasonic horn (not shown) and deformed in shape. The restoring force after the holder 5 is bonded is smoothly absorbed and alleviated by the open notch 12, and the original curvature of the outer blade can be maintained.

〔effect〕

As described above, the outer cutter body according to this invention has a plurality of notches 12 provided in the peripheral edge flange 11 of the dome-shaped outer cutter 6 in which a large number of whisker introduction holes 10 are formed.
In the inner step 8 of the synthetic resin outer cutter holder 5 that supports the synthetic resin outer cutter holder 5, at a position opposite to the notch 12, the circumferential flange 1 is smaller than the notch size of the notch 12.
A protruding portion 9 larger than the thickness dimension of 1 is provided, and the protruding portion 9 is made to protrude through the notch 12 with the peripheral flange portion 11 in contact with the inner step portion 8, and the protruding portion 9 and a synthetic resin annular member 7 inserted from below toward the inner step 8 are ultrasonically welded, and the peripheral flange 11 of the outer cutter 6 is sandwiched between the inner step 8 and the annular member 7. Therefore, it can be provided at a low cost without requiring a high degree of dimensional accuracy, and the outer cutter 6 does not become brittle due to the temperature of the resin, which occurs when the outer cutter 6 and the outer cutter holder 5 are integrally formed at the same time due to temperature changes. In addition, good warpage can be maintained without causing shrinkage distortion, and noise can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional outer cutter body, Fig. 2 is an exploded view showing an outer cutter body according to this invention, and Fig. 3 is a sectional view showing an outer cutter body according to this invention. be. 5...Outer blade holder, 6...Dome-shaped outer blade, 7...
...Annular member, 8...Inner stage part, 9...Protrusion part, 10
... Whisker introduction hole, 11 ... Peripheral flange, 12 ... Notch.

Claims (1)

[Scope of utility model registration request] A dome-shaped outer blade 6 with a large number of whisker introduction holes 10 formed therein.
A plurality of notches 12 are provided in the peripheral flange 11 of the
A synthetic resin outer cutter holder 5 that supports the outer cutter 6 in tension.
A convex portion 9 is provided on the inner step 8 of the holder at a position facing the notch 12, and the convex portion 9 is smaller than the notch size of the notch 12 and larger than the thickness of the peripheral flange 11. The protruding part 9 projects through the notch 12 while in contact with the inner step 8, and a synthetic resin annular ring is inserted into the protruding part 9 from below toward the inner step 8. The outer blade body of a rotary razor is formed by ultrasonically welding a member 7 and a peripheral flange 11 of an outer cutter 6 between an inner step 8 and an annular member 7.