JP5700519B2 - Safety razor - Google Patents

Description

  The present invention relates to a safety razor that is mainly used in general households and in which a razor head swings during use.

  The safety razor in which the razor head swings is configured such that during shaving, the razor head follows the undulation of the skin and swings to provide good shaving results. In such a safety razor, the razor head is swingably held by an arm provided at the upper end of the handle. Normally, the razor head is elastically supported so as to maintain a fixed position, and the journal is coupled to the arm. Has been. The razor head swings following the undulations of the skin when the razor head is applied to the skin at a certain pressure or higher during shaving. The razor head is swung by a force greater than the elastic force that is maintained. Safety razors that exhibit such excellent effects have been accepted by consumers, and have long maintained the mainstream position of safety razors.

Safety razors are mainly used for shaving, but users also use for shaving. Since the vellus hair is thin and soft, it can be shaved without applying a razor head to the skin as compared to shaving. It may be preferable to apply a razor head weakly to the skin depending on the part of the neck where the hair is shaved.

Even when the razor head is weakly applied to the skin when shaving shaved hair, it is preferable that the razor head swings following the undulations of the skin as in shaving. This is because the angle of the blade with respect to the skin when shaving the vellus hair can be improved by swinging the razor head. However, in conventional safety razors, when the razor head is applied to the skin weakly, the stress that the razor head receives from the skin when shaving the vellus is greater than the elastic force that keeps the razor head in a fixed position. It is difficult to rock the razor head. Accordingly, when the razor head is applied to the skin weakly when shaving shaved hair, it is preferable that the connecting portion bend easily so that the razor head swings easily. In order to swing the razor head when the razor head is applied to the skin weakly, for example, the connecting portion may be formed thin to facilitate bending. By doing so, the razor head can be swung even when shaving the shaved hair while the razor head is weakly applied to the skin, and a good shaving result can be obtained. It is sufficient that such a state where the connecting portion is easily bent when shaving shavings occurs in a narrow range of the swing angle of the razor head. This is because the undulation of the skin is very gradual in the place where the vellus hair grows compared to the jaw where the beard grows, and the rocking angle of the razor head when shaving the vellus hair is small.

On the other hand, when the beard is shaved, the oscillating angle of the razor head is increased. In addition to this, the razor head is swung more than necessary due to the influence of the resistance force received from the whisker when the beard is cut. Therefore, it is preferable that the connecting portion bend easily when the razor head swing angle is small. However, when the razor head swing exceeds the small swing angle, the ease of bending of the connecting portion is automatically reduced. It is necessary to let

There has already been proposed a safety razor that can adjust the flexibility of the connecting portion. It is a safety razor having a means in which a handle and a razor head are joined by a flexible connecting portion and the exposed length of the connecting portion can be adjusted. When the exposed length of the connecting part is increased, the connecting part is easily bent, and when the exposed length is reduced by covering a part of the connecting part with a cylindrical body, the connecting part is less easily bent. It is possible to adjust the ease of bending. However, adjustments must be made by hand and not automatically.

Japanese Utility Model Publication No. 55-143177

When using a safety razor suitable for shavings, where the connection part is always flexible, the resistance received from the beard is much greater than shavings, so the blade is caught by the whisker before the beard is cut. In this state, the connecting portion bends more than necessary. As a result, the blade stands more than the preferred angle with respect to the skin, so that it is a problem that a good shaving result cannot be obtained. Therefore, there is a need for a safety razor that can automatically adjust the ease of bending of the connecting portion with a simple configuration.

In the present invention, the razor head easily swings when the razor head is weakly applied to the skin as in shaving shaved hair, and the razor head receives a large resistance from the beard when shaving the razor head over a certain angle. The object of the present invention is to provide a safety razor whose ease of bending is automatically reduced according to the angle when it swings to a low price with a simple configuration. Any part of the head is integrally coupled to the upper ends of the two connecting parts extending from the handle, and any part of the razor head, the connecting part, and the handle are integrally formed by plastic injection molding. cage, the side facing the skin during use of the safety razor front, when defining the rear and the opposite side, the front-rear direction of the thickness of the connecting portion gradually decreases toward the upper end portion to the upper portion from its base It is formed on so that, to swing the razor head flexes during use part of the safety razor of between predetermined portions formed to the thickness of the connecting portion to the upper portion

In the invention according to claim 2, the rate of change from the middle of the connecting portion to the upper end is higher than the rate of change from the base of the connecting portion to the middle of the connecting portion. This is a smaller configuration.

According to a third aspect of the present invention , the razor head includes a blade base portion, a top plate, and a razor blade mounted between them, and the upper end portion of the blade base portion and the connection portion are integrally coupled. It is the composition which is.

The invention according to claim 4 is a configuration in which the razor head is coupled to the connection portion at the foremost portion thereof.

The present invention, when any part of the razor head is integrally coupled to the upper end of the connecting portion extending from the handle, when the safety razor is used, the side facing the skin is defined as the front side, and the opposite side is defined as the rear side. The connecting portion is formed such that the thickness in the front-rear direction of the portion having a predetermined length from the upper end portion toward the handle is gradually reduced toward the upper end portion, and a certain length in the portion having the predetermined length is formed. This portion is configured to bend when the safety razor is used and swing the razor head. The connection part is thinnest near the upper end, so when shaving the razor head weakly against the skin, shaving the razor head while swinging the razor head because the upper end is easily bent. And a good shaving result can be obtained. Further, since the thickness of the connecting portion gradually increases from the upper end portion in the direction of the handle, the connecting portion has a so-called firmness property with respect to bending. Therefore, when shaving, the ease of bending of the connecting portion automatically decreases as the oscillating angle of the razor head gradually increases. Can be obtained. Furthermore, the configuration for obtaining such an effect is such that the thickness in the front-rear direction of the connecting portion gradually decreases as it goes to the upper end portion of the portion having a predetermined length from the upper end portion of the connecting portion toward the handle. Since it is only formed, the configuration is simple and the manufacturing cost can be reduced.

In addition, when the razor head is configured with a razor blade mounted between the blade base and the top plate, and the blade base and the connecting part are integrally coupled at the forefront of the razor head, the front surface of the upper end of the connecting part It is possible to form a continuous surface from to the surface of the blade base. When the razor head is formed with a skin engaging surface extending in front of the edge of the razor blade and extending parallel to the edge of the razor, and the front surface of the upper end of the connecting portion is formed on a surface continuous with the skin engaging surface. The front surface of the upper end portion of the connection portion also acts as a skin engaging surface. Further, when the connecting portion is formed in an arm shape that is divided into two forks upward, it is possible to shave while checking the skin surface between the two arms.

It is a perspective view of the present invention. It is a side view of the present invention. It is a front view of the present invention. FIG. 3 is an AA end view in FIG. 2. It is a BB end view in FIG.

  Next, an embodiment of the present invention will be described. The safety razor 1 is provided with arm-shaped connecting portions 3 and 3 that are bifurcated upward from the upper end of the handle 2, and the razor head 4 is coupled to the upper ends of the connecting portions 3 and 3. ing.

The razor head 4 is provided with a razor blade 7 between a blade base 5 and a top plate 6. As a method for mounting the razor blade 7, for example, two leg portions (not shown) integrally extending from the lower surface of the top plate 6 are inserted into an insertion hole (not shown) provided in the razor blade 7 and the blade base 5. The razor blade 7 is interposed between the blade base 5 and the top plate 6 by inserting and crushing the end of the leg protruding from the lower surface of the blade base 5 to form the leg retaining portions 10 and 10. Installing. Other attachment methods, the legs (not shown.) End to form a small projection on the side surface of the protrusion insertion hole is press-fitted into the insertion hole of the blade base portion (not shown.) It may be fixed where it passes through. The razor blade 7 is equipped with a guard sheet 18 that exposes the edge of the blade at regular intervals. The guard sheet 18 is provided with a plurality of small holes 21 that are exposed in a row along the front edge of the top plate 6.

The razor head 4 has a guard bar 8 extending in front of the razor blade 7 and parallel to the blade edge 13. Both end portions of the guard bar 8 are integrally coupled to the upper end portions of the connecting portions 3 and 3 and are integrally coupled to the blade base portion 5 by two ribs 19. The surface of the guard bar 8 is a skin engaging surface 16 and four ribs 9 are provided. The skin engaging surface 16 of the guard bar 8 may be a smooth surface without unevenness, or may be a surface provided with a plurality of grooves in the length direction. The upper ends of the guard bar 8 and the connecting portions 3 and 3 are the forefront of the razor head 4. The front surfaces of the upper end portions of the connecting portions 3 and 3 are formed on skin engaging surfaces 17 and 17 that are smoothly continuous with the skin engaging surface 16 of the guard bar 8. The skin engaging surfaces 17, 17 are preferably formed in the same manner as the skin engaging surface 16, and may be smooth surfaces without irregularities, or may be surfaces having a plurality of grooves in the length direction. Good. The outer surfaces 11, 11 at the upper ends of the connection portions 3, 3 and the outer surfaces 12, 12 of the blade base 5 are formed to be flush with each other.

As described above, the connecting portions 3 and 3 are formed in an arm shape that is bifurcated upward from the upper end of the handle 2. The connecting portions 3 and 3 are formed integrally with the handle 2. The connecting portions 3 and 3 are formed such that the thickness in the front-rear direction gradually decreases from the base portions 14 and 14 toward the upper end portion. As shown in FIG. 4, the thickness in the vicinity of the upper end portions of the connecting portions 3 and 3 is thin, and as shown in FIG. 5, the thickness of the portion below the upper end portion is thicker than the thickness in the vicinity of the upper end portion. The position where the connection portions 3 and 3 are formed to be the thinnest exists slightly below the connection point between the connection portions 3 and 3 and the razor head 4, and the minimum thickness is about 1 mm, and the width of the portion. Is about 5 mm. The thickness below it, for example, along the line BB in FIG. 2, is about 1.5 mm and the width is about 6 mm. The thickness at the connection point between the connecting portions 3 and 3 and the razor head 4 is formed to be thicker than the minimum thickness described above. This is to prevent the portion from breaking when a large force is applied to the razor head 4 and the stress is concentrated at the joining point.
The rate of change in which the thickness of the connecting portions 3 and 3 is reduced is large from the base portions 14 and 14 of the connecting portions 3 and 3 to the middle of the connecting portions 3 and 3. That is, it becomes thinner a little at a relatively large rate. From the middle of the connecting portions 3 and 3 to the upper end portion, the rate of change that becomes thinner becomes smaller and gradually becomes thinner at a slight rate. Although the thin portion with a small change rate is bent during use, the entire portion is not bent, but the upper portion is bent from the portion formed to have a predetermined thickness. This is the same way of bending as a fishing rod. That is, the thin portion near the upper end is easily bent, the way of bending is reduced as it goes in the base direction, and the portion closer to the base is not further bent. An object that bends like this is called strong. That is, when a force for swinging the razor head 4 is applied, the thin portion near the upper ends of the connecting portions 3 and 3 is easily bent and the razor head 4 swings. When swinging to a predetermined position, the connecting portions 3 and 3 are hardly bent and swinging is restricted.

As shown in FIG. 2, in the section between the AA line and the BB line of the connection part 3, the side line center line of the connection part 3 forms a straight line. The angle formed by the extension line of the center line in side view and the extension line extending rearward of the extension line X in the front-rear direction of the razor blade 7 attached to the razor head 4 is about 100 degrees. This means that the razor head 4 is attached to the connection parts 3 and 3 at an angle of about 100 degrees. However, it is not limited to about 100 degrees and is preferably 70 to 160 degrees. Also, the center line in a side view in the section between the AA line and the BB line of the connecting portion 3 may be a convex curve. Moreover, the side view center line from the BB line to the lower end of the connection part 3 is formed in a convex curve on the rear side, and the side view center line from the lower end of the connection part 3 to the lower end of the handle is also continuous with it. A convex curve is formed on the rear side.

A shaving aid 15 for smoothly shaving or shaving is attached to the top surface of the top plate 6. The shaving aid 15 may be attached to the top plate 6 by injection molding, or may be previously formed by extrusion molding and attached to the top plate 6 after molding. The shaving aid 15 may be attached to a skin engaging surface other than the top plate 6. That is, you may attach to the skin engaging surface 16 of the guard bar 8, and may attach to the skin engaging surfaces 17 and 17 of the upper end part front surface of the connection parts 3 and 3. FIG. Components such as isoflavone and hyaluronic acid may be added to the shaving aid 15.

Next, the manufacturing method of the present invention will be described. In the manufacturing method of the present invention, the handle 2, the connecting portions 3, 3 and the blade base portion 5 are integrally formed by plastic injection molding, and the top is similarly formed by plastic injection molding. The plate 6 is formed, the razor blade 7 is placed on the blade base part 5, the top plate 6 is attached from above, and the razor blade 7 is clamped and fixed. As the plastic material, a resin such as polypropylene is preferably used.

  In the present invention, the connecting portions 3 and 3 may be coupled to both ends of the top plate 6 without being coupled to the blade base portion 5.

  According to the present invention, it is possible to obtain a razor head swing suitable for either shaving or shaving with a simple configuration.

  DESCRIPTION OF SYMBOLS 1 Safety razor, 2 handle, 3 connection part, 4 razor head, 5 blade base part, 6 top plate, 7 razor blade, 8 guard bar, 9 rib, 10 retaining part, 11 outer surface of connection part, 12 blade base part , 13 cutting edge, 14 base of connecting part, 15 shaving aid, 16 skin engaging surface of guard bar, 17 skin engaging surface of connecting part, 18 guard sheet, 19 bridge, 20 front edge of top plate, 21 Small hole

Claims (4)

The razor blade attached to the razor head is disposed so as to extend in a direction transverse to the handle, and any part of the razor head is integrally coupled to the upper ends of two connecting portions extending from the handle, and the razor When any part of the head, the connection part and the handle are integrally formed by plastic injection molding , when the safety razor is used, the side facing the skin is defined as the front side, and the opposite side is defined as the rear side. The thickness in the front-rear direction of the connecting portion is formed so as to gradually decrease from the base portion to the upper end portion as it goes to the upper end portion, and the portion between the portion formed at a predetermined thickness of the connecting portion and the upper end portion is A safety razor that bends and swings the razor head when the safety razor is used. The rate of change in which the thickness of the connecting portion becomes thinner is smaller in the rate of change from the middle of the connecting portion to the upper end than the rate of change from the base of the connecting portion to the middle of the connecting portion. Safety razor. The razor head is configured to include a blade part, a top plate, and a razor blade mounted between them, and the blade part and the upper end of the connecting part are integrally coupled. The safety razor according to 2. The safety razor according to claim 3, wherein the razor head is coupled to the connecting portion at the foremost part thereof.

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