JPS6213580Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a rotary electric shaver in which an inner cutter body slides on the inner surface of an outer cutter in a vertically movable state, for example.

In the conventional rotary electric shaver, by inserting the inner cutter body 2 into a plurality of insertion holes 10 formed in the inner cutter support 3 as shown in FIGS. 5 and 6,
A biasing portion 5 of an inner blade spring 4 that is fixed to the inner blade support 3 and applies upward force to the inner blade body 2 is attached to the inner blade support 3.
The structure was such that the inner cutter body 2 was prevented from coming off from the insertion hole 10 of the inner cutter support 3 by being locked in the inner cutter spring locking hole 11 of the inner cutter body 2 . According to this structure, the inner blade body 2
Since the inner blade spring locking hole 11 that locks the biasing part 5 of the inner blade spring 4 must be provided in the inner blade spring 4, the strength of the inner blade body is weak and the inner blade spring locking hole 11 may break on both sides. It was hot. In addition, since the inner cutter body 2 has a simple shape with few irregularities, some of the inner cutter bodies may overlap and stick to each other during heat treatment after press punching. ,
There was also the problem of incorporating two overlapping pieces.
Furthermore, since the lower part of the inner cutter spring locking hole 11 of the inner cutter body 2 extends considerably downward than the bottom surface 12 of the inner cutter support 3, the bottom surface 1 of the inner cutter support 3
2, a rib 16 for guiding the inner cutter body 2;
The ribs 16 have to be erected, which has the disadvantage that erecting the ribs 16 increases air resistance and increases current consumption.

This idea aims to eliminate the above drawbacks.
The purpose is to provide a rotary electric shaver in which the strength of the inner cutter body can be improved and the inner cutter body can be easily attached to the inner cutter support.

The gist of the present invention is an outer cutter 1, an inner cutter 2 that rotates and slides on the inner surface of the outer cutter 1, an inner cutter support 3 that inserts and supports the inner cutter 2 into an insertion hole 10 and rotates, and an inner cutter. The bottom surface 1 of the inner cutter body 2 is supported by the bottom surface 12 of the support 3.
A protrusion 8 is formed on the bottom of the inner cutter body 2 to protrude, and the inner cutter spring 4 has a base supported by the inner cutter support 3. a spring member 6 having an end portion 9 and biasing portions 5, 5 extending from the base end portion 9 and having bifurcated tips that push up both sides of the bottom surface 14 of the inner blade body 2; and an elastic piece 7 formed to extend from the base end 9 of the adjacent spring member 6 to an intermediate position between the biasing parts 5, 5, and the elastic piece 7 is When the blade body 2 is inserted from above the inner blade support 3, it is pressed by the protrusion 8 and is elastically deformed, and then moves above the protrusion 8, and the elastic piece 7 comes into contact with the protrusion 8. This rotary electric shaver is specially designed to have dimensions that prevent the inner cutter body 2 from slipping out upwards. An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4. 1 is an electroformed or press punched outer blade, 2 is an inner blade body inscribed in the outer blade 1, and 3
Reference numeral 4 indicates an inner cutter support having a disk shape and rotating motion, and 4 an inner cutter which is an integrally formed leaf spring that applies a pushing force to the inner cutter body 2, supports the inner cutter body so as to be able to move up and down. It is a blade spring. The base end 9 of the inner blade spring 4 is fixed by thermal welding or the like to a caulking pin 13 that stands up from the bottom surface 12 of the inner blade support 3. In addition, the inner blade spring 4
A spring member 6 extends from the base end 9 of the
The tip of the spring member 6 is bifurcated and serves as a biasing portion 5 that exerts an upward force on the inner blade body 2. In other words, the biasing parts 5, 5 are on both sides of the bottom surface 14 of the inner blade body 2 (both sides from which the approximately L-shaped protrusion 8 is removed).
is pushing up. An elastic piece 7 separate from the biasing portion 5 extends from the other base end portion 15 between the biasing portions 5 , 5 . In addition, the bottom surface 14 of the inner blade body 2
A substantially L-shaped protrusion 8 which is a protrusion is integrally projected from the bottom at a position equal to or more than the thickness of the inner blade spring 4, and the substantially L-shaped protrusion of the inner blade body 2 is attached to the elastic piece 7 of the inner blade spring 4. The protruding piece 8 is locked to prevent the inner cutter body from coming off above the insertion hole of the inner cutter support.
The area around the insertion hole 10 of the inner blade support 3 is as shown in FIG. It is cut out. In assembly, when the inner blade body 2 is inserted into the insertion hole 10, the approximately L-shaped protruding piece 8 first comes into contact with the elastic piece 7, and when the inner blade body 2 is further inserted, the elastic piece 7 bends downward, and finally the elastic piece 7 comes into contact with the elastic piece 7. It enters into the upper surface side of the piece 8, as shown in FIG. 1, and the biasing portions 5, 5 push up the bottom surfaces 14, 14.

Note that the approximately L-shaped protrusion 8 may protrude at one or more locations, and in addition to the above-mentioned approximately L-shaped protrusion 8, a protrusion such as a part of a spherical shape (possible by press forming) may also be used. It may be a cut-and-raised portion, and the important thing is that the protrusion engages with the elastic piece 7 of the inner blade spring so that the inner blade body 2 does not come off upward.

Further, the elastic direction of the elastic piece 7 is not limited to the vertical direction as in the embodiment, but may be the horizontal direction. In the case of the horizontal direction, the elastic piece or the protrusion has a slope portion so that a horizontal pressing force acts on the elastic piece when the elastic piece or the protrusion abuts, and the protrusion When pushed down to the lower part of the elastic piece, the elastic piece returns to its original flat position, and in this state, the elastic piece engages with the protrusion and prevents it from coming off upward.

As described above, in the present invention, the inner cutter body 2 is replaced by the inner cutter support 3.
Just by inserting it into the insertion hole 10 of the inner cutter body 2, the bottom surface 14 comes into contact with the biasing parts 5, 5 of the inner cutter spring 4 and is supported, and the protrusion 8 on the bottom of the inner cutter body 2 is connected to the elastic piece of the inner cutter spring. 7 to prevent it from coming off, the inner cutter body 2 can be attached to the inner cutter support 3 by simply inserting it from above, making automatic assembly possible. In addition, since the protrusion 8 is protruded from the bottom of the inner cutter body 2, the inner cutter bodies do not completely overlap due to heat treatment, thereby preventing two blades from being assembled into the inner cutter support. I can do things. Furthermore, since the inner cutter body 2 is not provided with the inner cutter spring locking hole 11 as shown in the conventional example shown in FIG. 6, the strength of the inner cutter body can be increased. Another advantage is that
The heights of the bottom surface 12 of the inner cutter support 3 and the bottom surface 14 of the inner cutter body 2 can be made almost the same, and the rib 17 is slightly larger than the stroke of the inner cutter body on the bottom surface of the inner cutter support 3. It is only necessary to set it upright, and it is possible to reduce unevenness on the bottom surface of the inner cutter support and reduce air resistance. Therefore, current consumption can be reduced and battery life can be extended.

Particularly, in the present invention, bifurcated biasing parts 5, 5 are provided at the tip of the spring member 6 of the inner blade spring 4, and the biasing parts 5, 5 are attached to the inner blade body 2.
Since both sides of the bottom surface 14 of the inner blade 2 are pushed up, both the inner end and the outer end of the inner cutter 2 are pushed up reliably, and the inner cutter 2 is prevented from tilting due to centrifugal force when the inner cutter rotates. It is also possible to reliably prevent uneven contact between the outer cutter and the inner cutter due to poor adhesion of the outer cutter and uneven contact, dramatically improving sharpness and preventing damage to the outer cutter and inner cutter. Moreover, by skillfully utilizing the lids of the biasing parts 5, 5, an elastic piece 7 is arranged to extend from the base end 9 of the adjacent spring member 6 between the biasing parts 5 and 5 at both ends. Then, near the intermediate position, the elastic piece 7
is engaged with a protrusion 8 formed at the lower part of the inner cutter body 2, and the upward release of the inner cutter body 2 is ensured by this protrusion 8, and the biasing parts 5, 5 and the elastic By appropriately arranging the piece 7 and the protrusion 8 of the inner cutter body 2, the space in these parts is effectively utilized, so the radial dimension of the inner cutter support 3 can also be small, which facilitates miniaturization. In addition, the inner cutter body 2 is reliably prevented from coming off upward.

Further, the spring member 6 that pushes up the inner cutter body 2 and the elastic piece 7 that locks the inner cutter body 2 are arranged completely independently, and the elastic piece 7 protrudes from the base end 9 of the adjacent spring member 6. Therefore, the spring member 6 is attached to the inner blade body 2.
The elastic piece 7 can be designed and manufactured by considering only the point of pushing the inner blade upward, and the elastic piece 7 can be designed and manufactured by considering only the function of locking the inner blade 2. When the spring member 6 is inserted and locked, there is no influence on the spring member 6, so that both can function under optimal conditions. Therefore, it is possible to improve the adhesion between the outer cutter and the inner cutter, resulting in improved sharpness, and it is possible to more reliably prevent the inner cutter from coming off, which has a great practical effect.

[Brief explanation of the drawing]

1 to 4 show a rotary electric shaver according to an embodiment of the present invention, FIG. 1 is a sectional view of the blade portion of the embodiment, FIG. 2 is a bottom view of the inner blade spring, and FIG. 3 4 is a perspective view of the inner cutter body, FIG. 4 is a perspective view of the inner cutter body and the inner cutter support, FIGS. 5 and 6 show the conventional example, and FIG. 5 is a cross-section of the blade portion of the conventional example. figure,
FIG. 6 is a perspective view of the inner cutter body. DESCRIPTION OF SYMBOLS 1... Outer cutter, 2... Inner cutter body, 3... Inner cutter support, 4... Inner cutter spring, 5... Biasing part, 7... Elastic piece, 8... Approximately L-shaped protrusion Piece (protrusion), 10...insertion hole.

Claims (1)

[Scope of utility model registration request] An outer cutter 1 and an inner cutter 2 that rotates and slides on the inner surface of the outer cutter 1.
, an inner cutter support 3 that inserts and supports the inner cutter 2 into the insertion hole 10 and rotates; and an inner cutter spring that is supported by the bottom surface 12 of the inner cutter support 3 and pushes up the bottom surface 14 of the inner cutter 2. 4, a protrusion 8 is formed protruding from the bottom of the inner blade body 2, and the inner blade spring 4 has a base end 9 supported by the inner blade support 3, and a base end 9 that is supported by the inner blade support 3; a spring member 6 extending from the portion 9 and having biasing portions 5, 5 having bifurcated tips that push up both sides of the bottom surface 14 of the inner blade body 2;
An elastic piece 7 formed to extend from the base end 9 of the adjacent spring member 6 to an intermediate position between the biasing parts 5, 5 is provided integrally, and the elastic piece 7 is
When the inner cutter body 2 is inserted from above the inner cutter support 3, it is pressed by the protrusion 8 and is elastically deformed, and then moves above the protrusion 8 so that the elastic piece 7 comes into contact with the protrusion 8. A rotary electric shaver characterized by having dimensions such that the inner cutter body 2 does not come out upward when the inner cutter body 2 comes into contact with the shaver.