JPH033515B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention provides a T-shaped two-blade safety razor having a holder, or a T-shaped two-blade safety razor that can be attached to and detached from the support at the upper end of the holder. This relates to a replacement blade cartridge.

(Prior art and problems to be solved by the invention) Conventionally, in this type of two-blade safety razor, as shown in FIGS.
A lower blade body 7, a spacer 9, an upper blade body 11, and a top plate 13 made of synthetic resin are placed on top of each other in order.
The support pin 3 of the top plate 13 connects the upper and lower blade bodies 11, 7, the spacer 9, and the support holes 12, 8, 9c, 2 of the blade base 2.
This support pin 3 is inserted into the blade holder 2 and caulked with the lower surface of the blade holder 2, and is clamped between the blade holder 2 and the top plate 13. However, in this clamping structure, the support pin 3 is simply inserted and caulked into the upper and lower blade bodies 11, 7 and the spacer 9, so if the support pin 3 is not sufficiently caulked, is the top plate 13 for the blade base 2.
There was a risk that the blades would become loose and the upper and lower blade bodies 11, 7 and spacer 9 would move, affecting the quality of the shave.

Therefore, the top plate was molded integrally with the support pins on the blade holder, and the protrusions provided on both the left and right sides of the top plate and the rear wall portion provided on the bottom surface of the top plate were attached to the blade holder. The first invention is one in which the upper and lower blade bodies, the spacer, and the top plate are prevented from moving on the blade stand by being integrally molded and brought into close contact with the blade.

Further, in the two-blade safety razor shown in FIGS. 16 and 17, the cutting edge 11a of the upper blade body 11 is located behind the cutting edge 7a of the lower blade body 7, and the front edge 9a of the spacer 9 is located behind the cutting edge 7a of the lower blade body 7. It immerses behind the cutting edge 11a,
A space 16 is formed between the upper and lower blade bodies 11 and 7 in front of the front edge 9a of the spacer 9. This space 16 is necessary to prevent the cutting edge 11a of the upper blade body 11 from being obstructed by the front edge 9a of the spacer 9 during shaving. On the other hand, protrusions 14 are formed from both left and right sides of the top plate 13 toward the front, and these protrusions 1
4 and the left and right sides of the blade base 2, the upper and lower double blade bodies 11,
7 and the spacer 9 are held on both left and right sides.

By the way, in order to prevent the above-mentioned loosening, the top plate 13
When the right and left protrusions 14 are also integrally formed on both the left and right sides of the blade base 2, the upper and lower blade bodies 11, 7
It is necessary to design the mold so that the synthetic resin does not flow into the space 16 between them, but the shape of the mold becomes very complicated in order to leave such a shaped space 16.

Therefore, the second invention is one in which the spacer is used in place of a mold by devising the shape of the spacer, thereby simplifying the shape of the mold.

Structure of the Invention (Means for Solving the Problems) That is, the first invention is made of synthetic resin as well as the synthetic resin blade base 2, as shown in particular in FIGS. In a two-blade safety razor blade in which a lower blade body 7, a spacer 9, and an upper blade body 11 are interposed between a top plate 13 made of steel, a support pin 3 protruding from the upper surface of the blade stand 2 is connected to the upper and lower blades. The top plate 13 is formed integrally with the support pin 3 on the upper blade body 11 by inserting it through the bodies 11, 7 and the spacer 9, and is brought into close contact with the support pin 3.
Protrusions 14 corresponding to the left and right sides 4 of the blade base 2 are provided on the blade base 2, and the protrusions 14 are integrally molded with the both sides 4 of the blade base 2 so as to be in close contact with each other. A rear wall portion 15 is provided protrudingly, and the rear wall portion 15 is connected to the blade rest 2.
rear side, upper and lower blade bodies 11, 7 and spacer 9
It is molded integrally with the rear side of the body and is attached tightly.

In addition, as shown in the drawings of the embodiments described later, particularly in Figures 1, 9 to 11, and 15, the second invention has a lower blade between the blade base 2 made of synthetic resin and the top plate 13 also made of synthetic resin. In a two-blade safety razor in which a body 7, a spacer 9 and an upper blade body 11 are interposed, the cutting edge 7 of the lower blade body 7 is
The cutting edge 11a of the upper blade body 11 is positioned behind the blade a, and the front edge 9a of the spacer 9 is recessed behind the cutting edge 11a of the upper blade body 11. A protrusion 10 is formed that protrudes forward from the cutting edge 11a of the upper blade body 11, and a support pin 3 protruding from the upper surface of the blade base 2 is inserted through the upper and lower blade bodies 11, 7 and the spacer 9 to form the upper blade body 11. Above, the top plate 13 is integrally molded with this support pin 3 and brought into close contact with the top plate 13.
Projections 14 protruding forward from the left and right sides 13b of the spacer 9 are integrally molded with the left and right sides 4 of the blade base 2 on the outside of both the left and right projections 10 of the spacer 9, and are brought into close contact with them. .

(Function) In the first invention, the top plate 13 is integrated with the support pin 3 of the blade stand 2, and the upper and lower blade bodies 11, 7 and the spacer 9 are brought into close contact between them, and further, By integrally molding the protrusions of the top plate on both sides of the blade holder, and by integrally molding the rear wall of the top plate on the rear side of the blade holder, the double blade body, and the rear side of the spacer, the top plate and The prevention of loosening of the upper and lower blade bodies and the spacer between the blade bases is further strengthened.

Further, in the second invention, in addition to the first invention, both the left and right protrusions 14 of the top plate 13 are also provided on both the left and right sides 4 of the blade base 2.
will be integrated into. Moreover, when molding both protrusions 14, the flow of synthetic resin
0, the synthetic resin is blocked by the leading edge 9a of the spacer 9.
It does not flow into the space 16 created between the upper and lower blade bodies 11 and 7 in front of the blade.

(Example) Hereinafter, an example of the first and second inventions will be described in the first to first embodiments.
The manufacturing process will be explained in order according to FIG.

First, as shown in FIG. 1, a T-shaped member having a blade base 2 formed at the upper end of a holder 1 is integrally molded from synthetic resin. On the rear side of the blade stand 2, four support pins 3 are arranged in parallel in the left-right direction and protrude upward. In addition, there are stepped portions 4a on both left and right sides 4 of the blade stand 2.
A guard 5 is installed between the front ends of the same side portion 4, and a beard dregs removal hole 6 is formed on the rear side of the guard 5.

Then, as shown in Figures 2 and 3, this blade stand 2
Place the lower blade body 7 on top. In this state, the lower blade body 7
Each support pin 3 of the blade stand 2 is inserted into each support hole 8 formed in the blade. Also, the cutting edge 7a of the lower blade body 7
is located above the dregs removal hole 6 of the blade base 2, and the left and right side parts 7b of the lower blade body 7 are on the same side part 4 inside the stepped part 4a of the left and right side parts 4a of the blade base 2. positioned.

Next, as shown in FIGS. 4 and 5, the lower blade body 7
Place spacer 9 on top. In this state, each support pin 3 of the blade stand 2 is inserted into each support hole 9c formed in the spacer 9. Further, the front edge 9a of the spacer 9 is located behind the cutting edge 7a of the lower blade body 7, and the left and right side portions 9b of the spacer 9 are located above the left and right side portions 7b of the lower blade body 7. In particular, protrusions 1 are provided at both left and right ends of the front edge 9a of the spacer 9.
0 protrudes forward to near the cutting edge 7a of the lower blade body 7.

Next, as shown in FIGS. 6 to 8, the upper blade body 11 is placed on the spacer 9. In this state, each support pin 3 of the blade base 2 is inserted into each support hole 12 formed in the upper blade body 11. Also, the upper blade body 11
The cutting edge 11a of the spacer 9 is located behind the cutting edge 7a of the lower blade body 7 on the protrusion 10 of the spacer 9, and the front edge 9a of the spacer 9 is recessed behind the cutting edge 11a of the upper blade body 11, and the protrusion 10 of the spacer 9 protrudes further forward than the cutting edge 11a of the upper blade body 11. On the other hand, the left and right side portions 11b of the upper blade body 11 are located on the left and right side portions 9b of the spacer 9.

Next, as shown in FIGS. 9 to 11, a top plate 13 made of synthetic resin is molded integrally with the support pin 3 of the blade base 2 on the upper blade body 11 and brought into close contact therewith. In this state, the front edge 13a of the top plate 13 is located behind the cutting edge 11a of the upper blade body 11, and the protrusions protruding forward from the left and right side parts 13b and the same side part 13b of the top plate 13 are 14 is located outside the left and right protrusions 10 of the spacer 9 on the stepped portions 4a of the left and right sides 4 of the blade base 2, and is integrally molded with the stepped portions 4a and is in close contact with the top plate 13. A rear wall portion 15 protruding from the lower surface serves as the rear side of the blade base 2 and the upper and lower blade bodies 1.
1, 7 and the rear side of the spacer 9 are also integrally molded and closely attached. Note that when forming the top plate 13, the upper and lower blade bodies 11, 7 and the support hole 1 of the spacer 9 are
The synthetic resin flows into the holes 2, 8, and 9c and comes into close contact with the outer periphery of the support pin 3 of the blade stand 2.

In particular, in this embodiment, the top plate 13 is integrated with the support pin 3 of the blade stand 2, and the upper and lower blade bodies 11, 7 and the spacer 9 are brought into close contact between them, causing them to become loose. There will be no fear. Furthermore, both the left and right protrusions 14 of the top plate 13 are also attached to the blade base 2.
Furthermore, the rear wall portion 15 of the top plate 13 is also integrated with the rear side of the blade base 2, the upper and lower blade bodies 11, 7, and the rear side of the spacer 9. , 7 and the spacer 9 from the left or right direction or from the rear, these protrusions 1
4. Since it is reliably absorbed by the rear wall portion 15, the loosening prevention function is further improved.

In addition, a space 16 created between the upper and lower blade bodies 11 and 7 in front of the front edge 9a of the spacer 9 is
It is located between the left and right protrusions 10 of. Therefore, the top plate 1
When the left and right projections 14 of No. 3 are integrally molded, the flow of the synthetic resin is blocked by the projections 10, and the synthetic resin does not flow into the space 16 between the upper and lower blade bodies 11 and 7. In other words, both protrusions 10 serve as a part of the mold.

In another embodiment shown in FIGS. 12 to 15, a spacer 9 made of synthetic resin is molded integrally with the support pin 3 of the blade base 3 on the lower blade body 7 in the state shown in FIGS. 2 and 3. This is what I did. In this state, the first
As shown in FIGS. 2 and 13, the support pin 3 protrudes from the upper surface of the spacer 9. In addition, during molding of the spacer 9, the synthetic resin flows into the support hole 8 of the lower blade body 7 and comes into close contact with the outer periphery of the support pin 3 of the blade base 2. After that, similarly to the case shown in Figs. 6 to 8,
When the upper blade body 11 is placed on the spacer 9, the state shown in FIG. 14 is obtained. Next, as in the case shown in FIGS. 9 to 11, when the top plate 13 made of synthetic resin is integrally molded with the support pin 3 of the blade base 2 on the upper blade body 11 and brought into close contact with the support pin 3, the 15th The state shown in the figure will be reached. In addition,
When forming the top plate 13, the support hole 1 of the upper blade body 11
The synthetic resin flows into 2 and tightly adheres to the outer periphery of the support pin 3 of the blade stand 2.

In the case of this embodiment as well, the function of preventing loosening is achieved as in the case of the previous embodiment. Moreover, spacer 9
Since it is also integrally molded, its functionality is further improved. Further, both the left and right protrusions 10 of the spacer 9 also perform the mold function as in the previous embodiment.

Effects of the Invention In short, according to the first invention, the top plate 13, the upper and lower blade bodies 11, 7, and the spacer 9 are reliably positioned with respect to the blade stand 2, and the upper and lower blade bodies 11,
7 and the spacer 9 from the left and right directions or from the rear, the protrusion 14 of the top plate 13 and the rear wall 15
Since they are absorbed more reliably, there is no risk of them moving due to loosening, which has the effect of improving the shave quality.

Further, according to the second invention, in addition to the effects of the first invention, both the left and right protrusions 10 of the spacer 9 function as a part of the mold, so there is an effect that the shape of the mold can be simplified. .

[Brief explanation of the drawing]

1 to 11 show one embodiment of the present invention.
The figure is a partially cutaway perspective view showing the holder and blade stand, the second
The figure is a partial perspective view showing the state in which the lower blade body is placed on the blade rest, Figure 3 is a sectional view of Figure 2, and Figure 4 is a partial perspective view showing the condition in which a spacer is further placed on the blade in Figure 2. Figure 5 is a sectional view of Figure 4, Figure 6 is a partial perspective view of the blade shown in Figure 4 with a lower blade further mounted, Figure 7 is a sectional view of Figure 6, and Figure 8 is a sectional view of Figure 4. The figure is a plan view of Fig. 6, Fig. 9 is a partial perspective view showing a state in which the top plate is further integrally molded with the one in Fig. 6, and Fig. 10 is a plan view of Fig. 6.
The figure shows a sectional view of FIG. 9, FIG. 11 is a plan view of FIG. 9, and FIGS. 12 to 15 show other embodiments of the present invention, and FIG. 13th partial perspective view showing the state of molding
The figure is a sectional view of Fig. 12, Fig. 14 is a sectional view of the one in Fig. 12 with an upper blade added, and Fig. 15 is the one in Fig. 14 with a top plate integrally molded. FIG. 16 is a sectional view showing a conventional two-blade safety razor, and FIG. 17 is a plan view thereof. Blade base...2, Support pin...3, Side of the blade base...
4, Lower blade body...7, Support hole...8, Spacer...
9, Support hole...9c, Protrusion...10, Upper blade body...
11, Support hole...12, Top plate...13, Side part of the top plate...13b, Protrusion...14, Rear wall part...15,
Space...16.

Claims (1)

[Claims] 1. A two-blade safety razor in which a lower blade body 7, a spacer 9, and an upper blade body 11 are interposed between a synthetic resin blade base 2 and a synthetic resin top plate 13, A support pin 3 protruding from the upper surface of the blade base 2 is inserted through the upper and lower blade bodies 11, 7 and the spacer 9, and the top plate 13 is integrally formed with the support pin 3 on the upper blade body 11. At the same time, protrusions 14 are provided on the left and right sides 13b of the top plate 13 corresponding to the left and right sides 4 of the blade base 2, and the protrusions 1
4 are integrally molded with both side parts 4 of the blade stand 2 and brought into close contact with each other, and further, a rear wall part 15 is provided protruding from the lower surface of the top plate 13, and the rear wall part 15 is attached to the rear side of the blade stand 2. Also, a two-blade safety razor characterized in that the upper and lower blade bodies 11, 7 and the rear side of the spacer 9 are integrally molded and brought into close contact with each other. 2. In a two-blade safety razor in which a lower blade body 7, a spacer 9, and an upper blade body 11 are interposed between a synthetic resin blade base 2 and a synthetic resin top plate 13, the lower blade body 7 is The upper blade body 1 is located behind the blade edge 7a.
At the same time, the front edge 9a of the spacer 9 is recessed behind the blade edge 11a of the upper blade body 11, and the front edge 9a of the spacer 9 has a blade at both left and right ends than the blade edge 11a of the upper blade body 11. The support pin 3 protruding from the upper surface of the blade base 2 is inserted through the upper and lower blade bodies 11, 7 and the spacer 9, and the top plate 13 is mounted on the upper blade body 11. The spacer 9 is integrally molded with the support pin 3 and brought into close contact with the support pin 3, and the protrusions 14 protruding forward from the left and right sides 13b of the top plate 13 are connected to the spacer 9.
The left and right sides 4 of the blade base 2 on the outside of both the left and right protrusions 10 of
A two-blade safety razor characterized by being integrally molded with and closely attached.