JPH10244084A - Razor head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve comfortableness without a mark's execution of an additional processing step by providing a blade housing of a razor head in such a manner as to have a skin engagement surface with a specified value of a static friction coefficient. SOLUTION: A razor head includes a cap 10, a guard element 20, a blade 25, an upper side wall 30, a base 40 and a shaving assisting agent 50, wherein the cap 10, the guard 20 and an upper skin engagement side wall part 30 are formed of low-friction material. These low-friction materials have a static friction coefficient of 0.20 or less, preferably 0.16 or less, most preferably 0.10 or less when it is measured at 40psi and at the atmospheric temperature. The skin engagement side wall part 30 is formed by thermoplastic martial having a lubricant selected from a group composed of PTFE, silicone and its mixture. The base 40 is formed of low-priced material having a large coefficient of friction such as polypropyrene, polystyrene or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet type shaving device, and more particularly to a shaving device having a skin engaging surface and a low friction shaving aid.

[0002]

2. Description of the Related Art The most important feature of a shaving apparatus is its ability to perform comfortable shaving. Over the last few years, various proposals have been made for the comfort of this shaving. US Patent No. 4,17 to Booth
According to U.S. Pat. No. 0,821, a shaving aid is connected to the razor head, during which the water-soluble active agent is released from the water-insoluble matrix. U.S. Pat. No. 4,291,463 to Williams shows a solid water-soluble lubricating shaving aid coated on a razor blade. US Patent No. 3,0, issued to Fischbein
No. 71,856 describes polytetrafluoroethylene (PT
FE) shows a blade edge coating of a polymeric material, such as FE); U.S. Pat.
No. 7,976 shows a blade edge coating with an organosiloxane, and US Pat. No. 2,229,417 to Wetherby shows a blade coating containing a wax and a surfactant. More recently, Ga
U.S. Pat. No. 4,914,817 to lligan shows a razor cartridge with a surface having a plurality of "riblets", wherein the "riblets"
Can be formed in a variety of ways and are configured to reduce friction between the user's skin and the guard surface of the razor cartridge.

[0003] Each of the above described attempts to provide even more comfortable shaving has required razor makers to perform additional processing steps or to add additional components to existing products. It is therefore desirable to provide a wet shaving system that can improve comfort without requiring the manufacturer to perform additional processing steps. Further, it is desirable to provide a wet shaving system that improves comfort without adding components.

In addition, the aforementioned shaving aids incorporating a water-insoluble matrix and a water-soluble active agent lose active ingredients during shaving. After repeated shaving, the skin surface during this shaving comes into contact with a matrix material that has a greater frictional force than the lubricating active. If the matrix and the skin are in contact, the sled is not comfortable. Thus, the likelihood that the matrix has a large coefficient of friction with the skin surface to be slashed is reduced.

[0005]

SUMMARY OF THE INVENTION Various embodiments of the present invention include a razor head having a blade housing, the blade housing having a skin engaging surface having a coefficient of static friction of 0.20 or less. I have.

[0006] The low friction skin engaging surface of the present invention is characterized in that
After repeated shaving in the same manner as the water-soluble activator shown in the oth patent, the activator does not wear out. In systems using such water-soluble active components, the amount of water-soluble material distributed to the surface of the skin during the course of repeated shaving is reduced, thereby reducing the benefit to the shaver. . In the next shaving, the consumer may come into contact with a larger water-insoluble matrix.

[0007] Another aspect of the present invention comprises a shaving aid having a water-insoluble material formed from a low friction material.

In accordance with another embodiment of the present invention, a razor head has a blade housing having a skin engaging surface having a coefficient of static friction of less than or equal to 0.20 and a shaving aid.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

[0010] Various embodiments of the present invention provide a razor head having a low friction surface area for more comfortable shaving. According to various embodiments of the present invention, when measured at 40 psi and measured in an atmospheric environment,
The razor head is 0.20 or less, preferably 0.1
It has a skin engaging surface with a coefficient of static friction of 6 or less, most preferably 0.10. The low friction skin engaging surface is provided on either the cap member, the guard element or the skin engaging portion of the side wall.

One embodiment of the present invention is in the form of a razor head shown in FIG. 1 and includes a cap 10, a guard element 20, a blade 25, an upper side wall 30, a base 40, and a shaving aid 50. In the illustrated embodiment, the cap 10, guard 20, and upper skin engaging sidewall portion 30 are formed of a low friction material. These low friction materials have a value of 0.20 or less, preferably 0.16 or less, and most preferably 0.10 or less when measured at 40 psi and ambient temperature. Some low friction materials are
Although higher than the thermoplastic commonly used in razor head blade housings, in the illustrated embodiment, the base 40 is formed from a low cost material having a high coefficient of friction, such as polypropylene, polystyrene. These materials typically have a coefficient of static friction of 0.25 or more when measured under the same conditions.
The high modulus of the friction base 40 facilitates handling while attaching and detaching the cartridge to and from the razor and helps keep the cartridge in the razor during shaving. However, the use of different materials is not necessary to obtain the benefits of the present invention. One skilled in the art will appreciate that when different materials are used, it is preferable to use chemically consistent materials. Thus, if a base having a low coefficient of friction is molded in sequence with a cap member having a low coefficient of friction, the material may exhibit a suitable chemically consistent state to form the required bond. preferable. If the shaving elements are formed separately and connected using an adhesive or a mechanical joint, the chemical consistency is not as important.

The advantages of the present invention are applicable to all razor heads. As used herein, the term "razor head" refers to a shaving cartridge configured to attach to another razor as well as the active skin-engaging portion of a shaving system in which the handle is integrally formed with the blade support structure. Is included.

According to another aspect of the present invention, the use of one or more low friction materials in a single razor head is within the scope of the present invention. For example, the cap member may be a first member.
The guard element can be formed from different low friction materials to optimize the shaving comfort.

According to another aspect of the invention, the shaving aid is formed from a water-insoluble low friction matrix and a water-soluble active ingredient extruded from the shaving aid during shaving. Even after the water-soluble components are depleted, a low-friction water-insoluble matrix is formed to provide a comfortable shaving life for the razor head. Thus, by using a water-insoluble, low friction matrix, the loss of active ingredients, eg, the friction reducing water-soluble active ingredients of the shaving aid, is offset by the low friction properties of the matrix. In addition, the reduced friction properties of the matrix complement the water-soluble components that result in the overall low friction component currently on the market. The use of a low-friction, water-insoluble matrix can further advantageously bring out the water-soluble material during shaving, thereby increasing the effectiveness of the distribution of the water-soluble components.

From this description, those skilled in the art can determine various suitable low coefficient of friction thermoplastic materials having a desired range of static coefficients of friction. As used herein, "low friction material" is used to indicate a material that has a static coefficient of friction of 0.20 or less when measured at 40 psi and ambient temperature. Preferred low friction materials have a coefficient of static friction of 0.16 or less, and most preferred low friction materials have a coefficient of friction of 0.10 or less. Examples of suitable thermoplastic materials include both crystalline and amorphous engineering thermoplastics, especially those that use lubricants such as PTFE, silicon, and other lubricants alone or in combination. Particularly commercially available components are Plaslube PC-50 /
TF / 13 / SI / 2, Electrafil J50 / CF / 10 / TF / 13 / SI / 2, Plas
Plaslube commercially available from DSM Engineering Plastics Reading, PA, such as lube PC-50 / TF / 10 / PL /, Plaslube J50 / 20 / SI / 2;
Includes thermoplastic under Electrafil®. From the present description, and those skilled in the art, other suitable materials may be recognized.

A number of different materials have been shown to be used as shaving aids. The term "shaving aid" as used herein refers to the active ingredients combined in a dispensing device, such as a water-insoluble microporous matrix structure. The active ingredient mentioned above is Booth
No. 4,170,821, which is incorporated herein by reference. Shaving aids have one or various combinations of the following ingredients.

A. Lubricants that reduce friction between the razor and the skin, for example, microencapsulated silicone oil.

B. Chemicals that reduce scratches between the laser component and the razor surface, eg, 10,000 and 6.0
Natural polysaccharides extracted from plant materials such as polyethylene oxide, non-ionic polyacrylamide, and / or "guar gum" in the molecular weight range between 00,000.

C. One example is a chemical that alters the chemical structure of the hair, such as a cosmetic hair remover, that allows the razor blade to pass through the beard very easily.

D. Cleaning agents that can easily wash beards and skin debris during shaving, for example,
Cleaning agents such as silicon polyethylene oxide block copolymers and sodium laurin sulfate.

E. A drug that kills microorganisms and treats skin damage and abrasions.

F. A cosmetic that softens, smoothes, conditions and improves the skin.

G. A hemostatic agent that controls bleeding from cuts and cuts.

H. An astrinsen that contracts blood vessels and stops body fluids such as lymph from the cut skin during shaving.

As another example, the shaving aid is Th
US Patent No. 5,056,221 to Oene, Ro
U.S. Patent No. 4,044,120 to Wsell et al.
No. 5,095,61 issued to Davis et al.
No. 9 or Yamazaki et al., Japanese Patent Application No. 7 (1995)
No. 24156. These are incorporated herein by reference.

Other active ingredients include various pigments, titanium dioxide, fragrances, aloe vera, fragrances, essential oils, vegetable oils. In addition to one or more active ingredients, the shaving aids of the present invention have other ingredients or mixtures of ingredients, such as water-insoluble polymers such as polystyrene and polypropylene.

[Brief description of the drawings]

FIG. 1 is a perspective view of a razor head according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cap 20 Guard element 25 Blade 30 Upper side wall 40 Base 50 Shaving aid

Claims (22)

[Claims] 1. A razor head having at least one blade and a blade housing with a skin engaging surface having a coefficient of static friction of 0.20 or less. 2. The razor head according to claim 1, wherein said skin engaging surface has a coefficient of static friction of 0.16 or less. 3. The razor head according to claim 1, wherein said skin engaging surface has a coefficient of static friction of 0.10 or less. 4. The razor head according to claim 1, wherein said skin engaging surface is formed from a thermoplastic material having a lubricant selected from the group consisting of PTFE, silicone and mixtures thereof. 5. The razor head according to claim 1, wherein the skin engaging surface is formed from a material having PTFE and silicon. 6. The method of claim 1, further comprising a shaving aid having at least one material selected from the group consisting of a lubricant, a pharmaceutical, a vitamin, a cosmetic, a hemostat, an astringent, a skin conditioner, and a mixture thereof. Razor head. 7. The non-skin engaging portion of the blade housing,
The razor head according to claim 1, comprising a metal having a coefficient of static friction greater than 0.25. 8. The blade housing has at least two low friction engagement portions, each of the low friction engagement portions comprising:
A razor head according to claim 1 having a coefficient of static friction of 0.20 or less. 9. A blade support having at least one blade, a skin engaging surface, and a shaving aid connected to a blade housing, wherein the skin engaging surface of the blade support is zero. A razor head having a coefficient of static friction of .20 or less. 10. The razor head according to claim 9, wherein said skin engaging surface has a static coefficient of friction of 0.16 or less. 11. The razor head according to claim 9, wherein said skin engaging surface has a static coefficient of friction of 0.10 or less. 12. The razor head according to claim 9, wherein said skin engaging surface is formed from a thermoplastic material having a lubricant selected from the group consisting of PTFE, silicone and mixtures thereof. 13. The razor head according to claim 9, wherein said skin engaging surface is formed of a thermoplastic material having PTFE and silicone. 14. Lubricants, pharmaceuticals, vitamins, cosmetics,
14. The razor head according to claim 13, comprising a shaving aid having a material selected from the group consisting of a hemostat, an astringent, a cleanser, a skin conditioner, and mixtures thereof. 15. The shaving aid comprises a lubricant,
Pharmaceuticals, vitamins, cosmetics, hemostats, astrinsen,
10. A razor head according to claim 9, comprising a shaving aid having a material selected from the group consisting of a cleanser, a skin conditioner, and mixtures thereof. 16. The razor head according to claim 9, wherein the non-skin engaging portion of the blade housing comprises a material having a coefficient of static friction of 0.25 or less. 17. A shaving aid comprising at least one blade and a shaving aid, wherein the shaving aid comprises 0.20
A razor head having a water-soluble matrix having the following static friction coefficient material and a water-soluble active ingredient. 18. The razor head according to claim 17, wherein said matrix material has a coefficient of static friction of 0.16 or less. 19. The razor head according to claim 17, wherein said matrix material has a coefficient of static friction of 0.10 or less. 20. The razor head according to claim 17, wherein said matrix material is formed from a thermoplastic material having a lubricant selected from the group consisting of PTFE, silicon and mixtures thereof. 21. The razor head according to claim 17, wherein said matrix material is formed from a thermoplastic material selected from the group consisting of PTFE, silicon and mixtures thereof. 22. The razor head according to claim 17, wherein the active ingredient is selected from the group consisting of a lubricant, a pharmaceutical, a vitamin, a cosmetic, a hemostat, an astringent, a cleanser, a skin conditioner, and mixtures thereof.