Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
  • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
  • B26B21/40—Details or accessories
  • B26B21/44—Means integral with, or attached to, the razor for storing shaving-cream, styptic, or the like
  • B26B21/443—Lubricating strips attached to the razor head
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
  • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
  • B26B21/40—Details or accessories
  • B26B21/4081—Shaving methods; Usage or wear indication; Testing methods
  • B26B21/4087—Usage or wear indication

Definitions

• This invention relates to an improved skin engaging member for use in razor blade cartridge assemblies and shaving systems of the wet shave type.
• the present invention resides broadly in providing the skin engaging cap and/or guard surfaces with configurations which reduce frictional drag of the razor across the skin.
• This invention also relates to a novel method of manufacturing the skin engaging member of the present invention.
• shaving aids can be applied prior to, during, or after shaving.
• a number of problems accompany the use of pre- and post-applied shaving aids.
• Pre-applied shaving aids can evaporate or can be carried away from the site of application by repeated strokes of the razor.
• Post-applied shaving aids are not present on the skin during shaving and thus their application may be too late to prevent an unwanted affect.
• Both pre-applied and post-applied shaving aids add additional steps to the shaving process.
• Proposals have been made to incorporate a shaving aid e.g., lubricant, whisker softener, razor cleanser, medicinal agent, cosmetic agent or combination thereof, into a razor, e.g., by depositing a shaving aid in a recess on the razor, by incorporating a shaving aid directly into one or more molded polymeric components of the razor, by adhesively securing a shaving aid composite to the razor, and by use of a mechanical connection between a shaving aid composite and the razor.
• a water- soluble shaving aid e.g.
• polyethylene oxide has been mixed with non-water-soluble material, e.g., a polystyrene polymer, to form an insoluble polymer/soluble shaving aid composite.
• non-water-soluble material e.g., a polystyrene polymer
• the composite has been mounted on razor and shaving cartridge structures, adjacent the shaving edge or edges, of single or multiple blade shaving system. Upon exposure to water, the water-soluble shaving aid leaches from the composite onto the skin.
• Extruded composites with relatively large amounts of shaving agent material (up to 80% by weight) and relatively low amounts of water insoluble matrix material (as little as 20% by weight) are relatively weak and have a tendency towards mechanical failure, both in assembly and in use. Increase in mechanical strength can be obtained with increased amounts of the matrix material. However, such increase reduces the releasability of the shaving material.
• a shaving unit that comprises at least one blade and a skin engaging member that has a surface for engaging the user's skin adjacent the blade edge.
• the shaving unit may be of a disposable cartridge type adapted for coupling to and uncoupling from a razor handle or may be integral with a handle so that the complete razor is discarded as a unit when the blade or blades become dulled.
• the blade edge (or edges) cooperate with skin engaging surfaces to define structure having a desired geometry.
• the skin engaging member is comprised of an elongated sheath made of a mixture of water insoluble matrix material and an effective amount of shaving aid material and a rigid core material extending axially throughout said sheath. The axial position of the core need not be through the central axis.
• PIG. 1 is a perspective view of a razor unit in accordance with the invention.
• FIG. 2 is a sectional view taken along the line 2-2 of FIG. 1;
• FIG. 3 is a perspective view of another razor unit in accordance with the invention.
• FIG. 4 is an enlarged perspective view of a skin engaging member of the present invention.
• FIG. 5 is sectional view taken along the line 3-3 of FIG. 4;
• FIG. 6-7 are sectional views in accordance with FIG. 5 wherein alternate core geometry's are depicted;
• FIG. 8 is yet another cross-sectional depiction
• FIG. 9 is a schematic cross-section diagram of an extrusion die suitable for manufacturing the skin engaging member of FIG. 4.
• the shaving unit 10 shown in FIGS. 1 and 2 includes base or platform member 12 molded of high impact polystyrene that includes integral coupling groove structure 14 for attachment to a razor handle and guard structure 16 that defines a transversely extending forward skin engaging surface 18.
• base or platform member 12 molded of high impact polystyrene that includes integral coupling groove structure 14 for attachment to a razor handle and guard structure 16 that defines a transversely extending forward skin engaging surface 18.
• steel leading blade 20 having a sharpened edge 22
• steel following blade 24 having sharpened edge 26
• aluminum spacer member 28 that maintains blades 20 and 24 in spaced relation.
• Cap member 30 is molded of high impact polystyrene and has body portion 32 that defines skin engaging surface 34 that extends transversely between forwardly projecting end walls 36 and has a front edge 38 that is disposed rearwardly of blade edge 26.
• Integral rivet portions 40 extend downwardly from transversely extending body portion 32 and pass through holes in blades 20 and 24, spacer 28, and platform 12 to secure cap 30, blades 20, 24 and spacer 28 on platform 12.
• Adhesively affixed to skin engaging surface 34 is skin engaging member 42.
• the shaving unit 50 shown in FIG. 3 is of the type shown in Jacobson U.S. Patent 4,586,255 and includes body 52 with front portion 54 and rear portion 56. Resiliently secured in body 52 are guard member 58, leading blade unit 60 and trailing blade unit 62. A shaving aid composite in the form of elongated insert member 64 is frictionally locked in opening 66 of rear portion 56.
• FIG's. 4-9 generally depict variations on the present invention.
• the term "core” refers to an internal portion of a skin engaging member as examined at the cross- section. The core typically runs throughout the skin engaging member along an axis. The axis need not be the central axis.
• the FIG's. designate the core as 70.
• Embodiments of the present invention have at least one core element.
• the term “sheath” refers to an outer coating layer(s) over the core material 13.
• the FIG's. designate sheaths as 72.
• the skin engaging member 64 has a skin engaging surface 74 and an elongated insert element 76.
• the insert member 76 is designed to frictionally lock in an opening as shown in FIG. 3.
• the skin engaging member further comprises a rigid core material 70 which is surrounded by a sheath material made of a mixture of water insoluble matrix material and an effective amount of shaving aid material.
• the sheath material includes from about 0% to about 30% by weight preferably from about 5% to about 15% of the water insoluble matrix material and from about 70% to about 100% by weight of the shaving aid preferably from about 85% to about 95% material.
• Suitable water insoluble matrix materials include for example, nylon, ethylene-vinyl acetate copolymer, polyethylene, polypropylene, polystyrene, polyacetyl and combinations.
• Suitable shaving aid materials include, for example, polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazoline, polyethylene glycol, polyvinyl alcohol, methylcellulose, starch, water soluble vinyl polymers (Carbopol ® brand sold by B.F. Goodrich) , polyhydroxyethylmethacrylate, silicone copolymers, sucrose stearate, vitamin E, panthenol, aloe, essential oils such as menthol and combinations.
• the sheath may include additional components such as: plastisizers, such as polyethylene glycol; beard softeners; additional lubricants, such as silicone oil. Teflon ® polytetrafluoroethylene powders (manufactured by DuPont) , and waxes; shaving aids, such as menthol, eugenol, eucalyptol, safrol and methyl salicylate; fillers, such as calcium carbonate, mica and fibers; tackifiers such as Hercules Regalrez 1094 and 1126; fragrances; antipruritic/counterirritant materials; antimicrobial/keratolytic materials such as Resorcinol, anti-inflammatory agents such as Candilla wax and glycyrrhetinic acid; astringents such as zinc sulfate; surfactants such as pluronic and iconol materials; compatibilizers such as styrene-b-EO copolymers; and, blowing agents such as Uni
• the present skin engaging member is produced by a coextrusion process whereby a rigid core material displaces a portion of the sheath material.
• the nature and relative portions of the sheath and core polymeric materials being such that the skin engaging member has adequate mechanical strength, both as initially produced and after a significant amount of water soluble material has been leached out, the quantity of the water-soluble material being sufficient to provide effective shaving assistance, such as lubrication, for the entire expected life of the blade or blades.
• the function of the core material is not only to provide additional rigidity but to displace trapped shaving aid material.
• conventional skin engaging members such as those described in U.S. Pat. Nos. 5,063,667; 5,095,619; and 5,113,585, a significant amount of shaving aid material is trapped within the insoluble matrix. By displacing it closer to the skin engaging surface 74, diffusional paths are reduced and more efficient delivery is achieved.
• the core material provides additional mechanical strength for the attaching mechanism, if used.
• the core material must have sufficient mechanical strength and rigidity to provide adequate mechanical strength to the entire skin engaging member, both as initially produced and after a significant amount of water insoluble material has been leached out of the sheath.
• the core material can be made from a non-water soluble plastic resin or a blend consisting of at least about 50% of non-water soluble plastic resin to prevent the core from disintegrating.
• Water-soluble resins for use in such blends include polyethylene oxide, polyvinyl pyrrolidone; polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazoline, polyethylene glycol, polyvinyl alcohol, methylcellulose, starch, water-soluble vinyl polymers (Carbopol ® brand sold by B.F.
• Core material suitable for use in the present invention include polystyrene, high impact polystyrene, polypropylene, filled polypropylene, nylon, and blends such as 70% nylon/30% polyethylene oxide, 60% polystyrene/40% polyethylene oxide.
• the core material can include additives such as lubricants foaming agents, microspheres, baby powders, fillers such as CaCO ⁇ , colorants such as TiC*2 silicone copolymers, sucrose stearate, vitamin E, panthenol, aloe, essential oils, e.g. menthol, and combinations thereof.
• additives such as lubricants foaming agents, microspheres, baby powders, fillers such as CaCO ⁇ , colorants such as TiC*2 silicone copolymers, sucrose stearate, vitamin E, panthenol, aloe, essential oils, e.g. menthol, and combinations thereof.
• a wear indicating effect is produced when the sheath material and the core material are made of disparately colored materials (e.g. white colored sheath and blue colored core) .
• the sheath material over the skin engaging surface is typically worn off through use. With sufficient use, a second colored region represented by the core is exposed, thus, providing the user with and indication that the shaving unit and/or skin engaging surface have reached their effective life.
• the sheath material consists of polyethylene oxide/polystyrene mixture which is white in color and the core consists of nylon and/or styrene which has been colored with a FD&C #2 dye.
• Other suitable dyes or pigments include FD&C Red No.
• Figure 5 depicts a cross section of an alternate skin engaging member.
• the core material 70 follows the general contours of the surface defined by the outside of the sheath material.
• Figure 6 depicts a slight variation on that theme where a thicker sheath layer is provided along the skin engaging surface 74.
• Figure 7 provides a cross-section wherein a very high degree of sheath material is present along the skin engaging surface.
• Figure 8 depicts the skin engaging member depicted in Figures 1 and 2. It is interesting to note that the core in this case provides mechanical strength to the unit yet is not vital to the mechanical locking of the unit.
• the skin engaging member of Figures 1 and 2 are affixed by adhesive. According to the present invention, the skin engaging members may be a affixed by adhesive such as Loctite Super Bonder 499, mechanical locking mechanism, thermal welds.
• Figure 9 is a schematic cross section diagram of an extrusion die suitable for manufacturing the skin engaging member of the present invention.
• Core material is fed into the intrusion die 51 by an extrusion screw, hot melt or other suitable means.
• the tight core orifice 53 encounters the sheath material wherein the core becomes encapsulated by the sheath material when viewed in a transverse cross section to the flow of the die material.
• the encapsulated core then proceeds to the die outlet 55 wherein the continuous skin engaging members can be cured and/or drawn down to provide the appropriate dimensions.
• the core material could consist of a solid wire or solid plastic material which is fed in through a conventional die to produce an encapsulated skin engaging member.
• the strand is sent for further processing where it is typically drawn down to the correct size and cut to length suitable for implant into the body of a razor blade cartridge. This cutting can be achieved by knife edge cutting, lasers or water lasers.
• the skin engaging surfaces of the present invention typically are rectangular in shape with a width of from about 0.05 inches to about 0.1 inches and a length of about 1.2 inches. Applicant considers equivalent embodiments to be part of the present invention. For example, non-rectangular skin engaging surface areas may be utilized (such as ovals) and non-flat surface patterns could be utilized. These and other equivalent embodiments are also contemplated by the present invention.
• the present invention and the manner of making and using the same should be evident from the following examples: EXAMPLES
• Example 12 The following procedure can be used to produce a skin engaging member of the type depicted in Figure 4.
• the extrusion equipment includes two single-screw extruders, a die cross-head, a cooling channel, and a puller.
• the strip extruded from the extruders is pulled through a cooling tunnel by a Farris puller (a take-off machine) at a speed of approximately 10 feet per minute with minimum tension on the strip.
• the strip is air-cooled by blowing dry compressed air into the tunnel at approximately 10 CFM.
• the extrudate is kept in a cool, dry room.
• the core blend (70% Zytel 330 brand amorphous nylon/blue pigment, 30% ethylene oxide/styrene blend 60/40 is extruded through the first 3/4" Haake extruder (barrel pressure of 4,343 psi,and temperature of 180°C).
• the sheath blend (80% polyethylene oxide/styrene

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• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Cosmetics (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Magnetic Heads (AREA)
• Paper (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Glass Compositions (AREA)
• Formation And Processing Of Food Products (AREA)
• Surgical Instruments (AREA)
• Preparation Of Compounds By Using Micro-Organisms (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)

Priority Applications (2)

Applications Claiming Priority (5)

Related Child Applications (1)

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• 1995
  • 1995-06-29 WO PCT/US1995/009078 patent/WO1996001172A1/en active IP Right Grant
  • 1995-06-29 DE DE69519432T patent/DE69519432T2/de not_active Expired - Lifetime
  • 1995-06-29 AT AT95926310T patent/ATE197566T1/de not_active IP Right Cessation
  • 1995-06-29 ES ES99100307T patent/ES2172263T3/es not_active Expired - Lifetime
  • 1995-06-29 AU AU30710/95A patent/AU707126B2/en not_active Expired
  • 1995-06-29 CN CN95194471A patent/CN1105000C/zh not_active Expired - Lifetime
  • 1995-06-29 EP EP95926310A patent/EP0772511B1/de not_active Expired - Lifetime
  • 1995-06-29 CA CA002194162A patent/CA2194162C/en not_active Expired - Lifetime
  • 1995-06-29 DE DE69525268T patent/DE69525268T2/de not_active Expired - Lifetime
  • 1995-06-29 ES ES95926310T patent/ES2153487T3/es not_active Expired - Lifetime
  • 1995-06-29 PL PL95324432A patent/PL181077B1/pl unknown
  • 1995-06-29 BR BR9508372A patent/BR9508372A/pt not_active IP Right Cessation
  • 1995-06-29 MX MX9700146A patent/MX9700146A/es unknown
  • 1995-06-30 MA MA23941A patent/MA23597A1/fr unknown
  • 1995-06-30 TR TR95/00794A patent/TR199500794A2/xx unknown
  • 1995-07-01 EG EG52195A patent/EG20660A/xx active
  • 1995-07-01 MY MYPI95001831A patent/MY124228A/en unknown

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