JP3209975B2 - Safety razor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a safety razor used by the general public.

[0002]

2. Description of the Related Art There has been a safety razor blade that swings during use as disclosed in Japanese Patent Application Laid-Open No. 51-137554. In the configuration disclosed in this publication, the cartridge replacement blade is journal-coupled to a journal shaft provided on the top of the holder, and the cartridge replacement blade swings around the journal axis. Things.

[0003] In addition, as disclosed in Japanese Patent Publication No. 3-57791, the blades of the safety razor move up and down during use, each blade is supported by an elastic member, and each blade is moved. There is something that moves vertically independently.

[0004] In addition, a type in which the blade member moves during use of the safety razor has been conventionally proposed as shown in Japanese Patent Publication No. 7-55267. In the configuration disclosed in this publication, the blade base is integrally connected to the blade support so as to swing or move up and down via an elongated elastic portion, and is attached to the blade base during use of the safety razor. The blade body moves together with the blade base.

[0005]

Among the prior arts described in the above publication, a safety razor disclosed in Japanese Patent Application Laid-Open No. 51-137554 is characterized in that a cartridge replacement blade swings around a journal shaft. This is called a swing-type safety razor. Jars between cartridge replacement blades and holders
The null connection is a connection between the journal shaft and the journal bearing, and has a configuration in which friction occurs between the shaft and the bearing. Therefore, there is a disadvantage that the swing of the cartridge replacement blade is not smooth due to the friction.

In the safety razor disclosed in Japanese Patent Publication No. 3-57791, the individual blades move individually and vertically.
It is formed by bending slightly. Therefore, there is a disadvantage that the configuration for supporting the individual blades is complicated, and the blades also need to be bent, resulting in a very high cost.

Further, in the safety razor disclosed in Japanese Patent Publication No. 7-55267, the blade moves up and down. To be precise, the blade moves up and down while slightly swinging. That is, the swing angle is extremely small as compared with the vertical and vertical movement amounts of the blade body. This is because the movement of the blade body is caused by bending of a portion extending in the longitudinal direction of the elongated elastic portion bent in a key shape. More specifically, in use, when the replacement blade receives an external force, the elongated elastic portion bends in an arc shape and the blade body swings, and the shaving angle tends to change, but at the same time, the blade edge of the blade body Is applied to lower the cutting edge in the vertical direction. As a result, the elastic portion bent in the bow shape is deformed and bent in a waveform, so that the shaving angle returns to the original state. That is, initially, the blade body is turned upward to change the shaving angle, but the external force applied to the blade edge changes the blade edge downward, and the shaving angle returns immediately, so that the shaving is not efficiently performed. Will be. Further, the changed shaving angle is returned to the original one by the torsion of the portion of the elastic portion that extends short in the lateral direction, and a sufficient shaving angle cannot be obtained.

In the safety razor disclosed in Japanese Patent Publication No. 7-55267, the blade body is moved by utilizing the bending of the entire elongated portion of the elastic portion extending in the vertical direction. There is. As a result, the length of the cartridge replacement blade itself in the vertical direction is increased, and the cartridge replacement blade cannot be formed to be slender and cannot be made smart in design.

In each of the prior arts described above, the cartridge replacement blade is all movable. The reason is that the replacement blade automatically moves according to the unevenness of the face during use, so that a safe razor can be used by hand. In order to save time and effort to obtain an ideal shaving angle. Therefore, the shave angle changes only slightly when the blade body moves vertically, and a sufficient angle cannot be obtained when a large shave angle is required. The safety razor disclosed in Japanese Patent Publication No. 3-57791 is insufficient in this respect. In addition, the safety razor disclosed in Japanese Patent Publication No. 7-55267 also returns immediately to its original state even if the blade swings, and the blade moves sufficiently in the vertical direction. Is very slight, and after all, the change of the shaving angle is not enough.

An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional product, and to provide a low-cost product in which the blade body swings smoothly and sufficiently during use to change the shaving angle. It is assumed that.

[0011]

According to a first aspect of the present invention, there is provided a construction including a top plate, a blade member, and a base.
The base 3 is formed in a substantially rectangular frame shape.
4, the blade support pieces 4 extend integrally therewith via the hinges 5, and each blade support piece 4 is provided with an insertion hole 16 so that a fitting projection 8 extending from the lower surface of the top plate is formed. Insertion hole 1
6, the blade body member 2 is clamped between the top plate 1 and the blade body support piece 4, and the blade body member 2 is
Together with the hinge 5 so that the guard
9 extends in front of the front frame portion 14 at an interval from the front frame portion 14. The present invention described in claim 2 is obtained by adding a configuration in which the upper end of the front frame portion 14 is obliquely cut to claim 1.

[0012]

According to the present invention, the base 3 is provided with a cantilever blade support piece 4 extending at right angles to the longitudinal direction of the base 3 via a hinge 5. , The blade member 2 is fixed to the upper surface of the blade support piece 4, and the blade member 2
Can swing about the hinge 5 together with the blade support piece 4. Therefore, since the cantilever blade support piece 4 for rocking the blade member 2 is provided integrally with the base 3 and has a simple structure, a safe razor that can rock the blade body is provided at low cost. can do.

The cantilever blade support piece 4 swings about a hinge 5. As described above, the safety razor disclosed in Japanese Patent Publication No. 7-55267 also has a portion similar to the cantilever blade support piece, but the entire blade support piece is an elastic part, and this is an overall part. Since the blade body moves by bending, the blade body that has swung as described above immediately returns to its original state by bending the elastic portion into a waveform. Therefore, since the blade body only moves vertically without swinging, the change in the shaving angle due to the swing was very small. In the present invention, since the blade body member 2 swings by bending the hinge 5, the swing axis of the spare blade is the fixed hinge 5. Thus, conventionally, when the shaving angle is changed by moving the blade member in the vertical direction, the change in the shaving angle is slight, but the present invention does not require the blade member 2 to move vertically. Since the blade member swings about the fixed swing axis, a sufficient shaving angle can be obtained.

Further, the swing of the blade supporting member 4 is caused by the hinge 5, and does not utilize the entire bending of the blade supporting member 4 itself. Therefore, even if the length of the blade supporting piece 4 is shortened, the blade supporting piece 4 smoothly swings around the hinge 5, so that the length of the blade supporting piece 4 is shortened to change the cartridge replacement blade. Can be similarly shortened. As a result, the entire replacement blade can be made thinner, and a smarter blade in design can be provided.

According to the second aspect of the present invention, it is possible to prevent a mustache from being clogged between the front frame portion 14 and the blade member 2 during use.

[0016]

Embodiments of the present invention will now be described with reference to the drawings. Although the drawings relate to a cartridge replacement blade of a replaceable blade-type safety razor, the present invention is not limited to this, and may be a disposable safety razor in which a base and a handle are integrally connected.

The cartridge replacement blade comprises a top plate 1, a blade member 2, and a base 3. The blade member 2 includes three blades 6 and two spacers 7 interposed between the blades.
The blade member 2 is not limited to this, and may be composed of two blades and one spacer interposed therebetween, or may be a single blade. Is also good.

The top plate 1 is integrally provided with four fitting projections 8 on the back surface thereof, and is inserted through four insertion holes 9 provided in the blade member 2. End walls 10, 10 for protecting both ends of the blade member 2 are integrally provided at both ends of the top plate 1.

The base 3 is integrally formed of a synthetic resin and is formed in a substantially rectangular frame shape. A center rib 11 is provided at the center of the base 3, and bearing ribs 12, 12 are provided on both sides of the middle rib 11.
Is provided. Journal bearings 13, 13 are provided on the dual bearing ribs 12, 12, respectively. This is for journal connection with a journal shaft provided on a holder for mounting the cartridge replacement blade, and the cartridge replacement blade also swings by this journal connection. Can be obtained. A safety razor in which the cartridge replacement blade is journaled to the holder and is swingable is called a swing-type safety razor as described above, and the cartridge replacement blade swings along irregularities on the face. It is intended to shave the beard smoothly and efficiently.

A typical swing-type safety razor has the structure disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 51-137554. Describing this configuration, two arms are provided at the upper end of the handle, and a journal shaft is provided inward at each end of the arm. Since the two arms can be slightly opened outward, respectively, the arms are opened when the cartridge replacement blade is mounted, and the journal shaft is applied to the journal bearing of the cartridge replacement blade. Later, the arm is closed. By this operation, the journal shaft is inserted into the journal bearing, so that the cartridge replacement blade can swing about the journal axis.

The present invention is more preferably used for such a swing-type safety razor. When the present invention is used in combination with a swing-type safety razor, the cartridge replacement blade itself swings by the journal coupling device, and at the same time, the blade body member 2 swings about the hinge 5. In fact, it has been confirmed by experiments that the blade member 2 swings in response to the unevenness of the face more than the conventional swing-type safety razor, and that the shaving is performed more smoothly and efficiently. In the present invention, the connection between the cartridge replacement blade and the holder is not limited to the journal connection.

A blade support piece 4 extends from the front frame portion 14 of the frame base 3 integrally therewith at a right angle rearward. Blade support piece 4
Are provided and arranged so as to be at the same interval as the fitting projection 8. The blade supporting piece 4 is formed to be slightly thicker, so that only the hinge 5 is bent, and the other portions hardly bend. That is, the swing of the blade support piece 4 is caused by the hinge 5, and the blade support piece 4
It does not take advantage of its own overall deflection. Therefore, even if the length of the blade support piece 4 is shortened, the blade support piece 4 swings smoothly around the hinge 5. As a result, it is possible to reduce the length of the cartridge replacement blade in the front-rear direction and to reduce the overall size. The number of the blade support pieces 4 is not limited to four.

Each blade support piece 4 is provided with an insertion hole 16, and the fitting projection 8 inserted into the insertion hole 9 of the blade member further projects through the insertion hole 16 to the rear surface. The blade portion 2 is firmly clamped between the top plate 1 and the blade support piece 4 by crushing the formed portion to form a fixed head 17. As a result, the blade member 2 and the top plate 1 can swing together with the blade support piece 4 about the hinge 5. here,
Since the end walls 10, 10 of the top plate are located outside the both ends of the base 3, the end portions of the base 3 do not hit the end walls 10, 10.

The upper surface of the blade supporting piece 4 has the same height as the upper surface of the front frame portion 14. The height of the upper surfaces of the rear frame portion 18 and the horizontal frame portions 15, 15 is formed to be lower than the height of the upper surface of the front frame portion 14. Thereby, the top plate 1
There is a gap between the rear surface of the rear frame portion and the rear frame portion 14, so that the blade body member 2 can swing by the gap, and further swinging is restricted. This implies that there is no fixed regulation on the swing of the blade member, and if the shaving angle becomes too large during use, the skin may be damaged. However, the swing of the blade member 2 is limited by the width of the gap. Therefore, the shaving angle can be used safely without increasing beyond a certain value.

As shown in FIG. 4, if the upper end of the front frame portion 14 is cut obliquely, it is possible to completely prevent the shavings from being clogged between the front frame portion 14 and the blade member.

A thin hinge 5 is formed at the base of each blade support piece 4, and this hinge 5 extends in a groove shape in the lateral direction. Since the hinge 5 is formed in a hemispherical groove shape in cross section and extends in the lateral direction, the blade member 2 can swing about the hinge 5 together with the blade support piece 4. The cross-sectional shape of the hinge 5 is not limited to a hemisphere, and may be a triangle or a quadrangle. By providing the hinge 5, the blade member 2 swings while the swing axis is substantially fixed at the position of the hinge 5. This allows the shaving angle to be changed about the fixed pivot axis, similar to a pivoting motion by a journal connection with the pivot axis completely fixed. When the swing axis is fixed, the change in the shaving angle becomes remarkable even when the spare blade slightly moves due to an external force during use.

When the shaving angle is changed by moving the blade member in the vertical direction as in the prior art, the change in the shaving angle is slight, but the blade member swings about a fixed swing axis. When shaving, the shaving angle can be changed sufficiently. According to the present invention, a hinge 5 can be used instead of or in combination with a journal coupling device conventionally used as a means for swinging a blade member.
By using such simple means, it is possible to obtain a sufficient swing of the blade member and a change in the shaving angle associated therewith.

The present invention is not limited to the configuration in which the blade body member 2 swings together with the top plate 1, but the blade body 6 and the spacer 7 constituting the blade body member 2 are overlapped and joined. Alternatively, the blade member 2 may be joined to the blade support piece 4. In this case, the top plate 1 is connected to the base 3, and the blade body member 4 swings, but the top plate 1 does not swing.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the present invention.

FIG. 2 is a sectional view of the present invention.

FIG. 3 is a cross-sectional view of a state where the blade member swings.

FIG. 4 is a sectional view of another embodiment in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top plate 2 Blade body member 3 Base 4 Blade body support piece 5 Hinge 6 Blade body 7 Spacer 8 Fitting protrusion 9 Insertion hole 10 End wall 11 Medium rib 12 Bearing rib 13 Bearing 14 Front frame 15 Horizontal frame Part 16 Insertion hole 17 Fixed head 18 Rear frame part 19 Guard bar

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B26B 21/22 B26B 21/14

Claims (2)

(57) [Claims] 1. A base (3), comprising a top plate (1), a blade member (2), and a base (3), the base (3) being formed in a substantially rectangular frame shape, and a front frame of the base (3). A blade support piece (4) extends rearwardly from the portion (14) via a hinge (5) integrally therewith, and each blade support piece (4) is provided with an insertion hole (16),
The fitting projection (8) extending from the lower surface of the top plate is inserted into the insertion hole (1).
6), the blade body member (2) is clamped between the top plate (1) and the blade body support piece (4), and the blade body member (2) is together with the blade body support piece (4). A hinge (5) is swingable about a center, and a guard (19) is attached to the front frame (1).
A safety razor extending forward of (4) at a distance from the front frame (14). 2. The safety razor according to claim 1, wherein an upper end of the front frame (14) is cut obliquely.