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EP0554367B1 - Safety razors - Google Patents

Safety razors Download PDF

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Publication number
EP0554367B1
EP0554367B1 EP91920238A EP91920238A EP0554367B1 EP 0554367 B1 EP0554367 B1 EP 0554367B1 EP 91920238 A EP91920238 A EP 91920238A EP 91920238 A EP91920238 A EP 91920238A EP 0554367 B1 EP0554367 B1 EP 0554367B1
Authority
EP
European Patent Office
Prior art keywords
teeth
blade unit
comb
polyethylene oxide
blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91920238A
Other languages
German (de)
French (fr)
Other versions
EP0554367A4 (en
EP0554367A1 (en
Inventor
Robert Gillibrand
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gillette Co LLC
Original Assignee
Gillette Co LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gillette Co LLC filed Critical Gillette Co LLC
Publication of EP0554367A1 publication Critical patent/EP0554367A1/en
Publication of EP0554367A4 publication Critical patent/EP0554367A4/en
Application granted granted Critical
Publication of EP0554367B1 publication Critical patent/EP0554367B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B26B21/4068—Mounting devices; Manufacture of razors or cartridges
    • 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

Definitions

  • This invention is concerned with safety razors which comprise a flexible razor blade unit secured to a handle by connecting means arranged to permit flexure of the unit when the razor is used.
  • the blade unit is flexible in the sense that it is readily flexible, in response to forces encountered during normal use, about an axis or axes parallel with the plane of the blade unit and extending substantially perpendicular to the cutting edge(s) of the blade(s).
  • Safety razors of this kind are described for example, in British Specifications 1589591 and 2119690.
  • blade unit for such a safety razor comprises a flexible blade or tandem flexible blades with a flexible spacer therebetween, which blade or blades and spacer are mounted in a moulded plastics housing providing a comb-like guard portion and a comb-like cap portion, the teeth of the two comb-like portions being interconnected by a web which is sufficiently thin to be flexible.
  • the blade unit is connected to a razor handle by connecting means which permit flexing of the blade unit in use.
  • a safety razor which comprises a razor blade unit which is readily flexible, in response forces encountered during normal use, about an axis or axes parallel with the plane of the blade or blades and extending substantially perpendicular to the cutting edge(s) thereof, a handle, and connecting means connecting the blade unit to the handle which means permit flexing of the blade unit, the blade unit comprising a moulded plastics housing providing a comb-like guard portion and a comb-like cap portion between which the blade or tandem blades with a spacer therebetween is/are clamped, the teeth of the two comb-like portions being interconnected by a web which is sufficiently thin to be flexible, and the blade unit further comprising a comb-like moulding of a mixture of polyethylene oxide and a structural polymer, positioned between the teeth of the comb-like cap portion, the teeth of the polyethylene oxide-containing moulding being narrower than the space between the teeth of the cap portion so that the blade unit can flex concavely.
  • the teeth of the polyethylene oxide-containing moulding are preferably level with or project above the teeth of the cap portion.
  • inserts formed of a mixture of polyethylene oxide and a structural polymer, such as polystyrene, in the cap and/or the guard portions of razors and blade units to improve shaving performance is known and has been described, for example, in British Specification 2024082.
  • Such inserts typically contain, by weight, 80% of polyethylene oxide and 20% of structural polymer.
  • the present invention provides a particularly convenient way of incorporating polyethylene oxide-containing inserts in a flexible blade unit of the kind described.
  • the illustrated razor comprises a flexible blade unit 10 which comprises a moulded plastics housing 11 (made, for example, from polystyrene) which has a comb-like guard portion 12 and a comb-like cap portion 13 between which a combination of tandem single edged razor blades 14 with a spacer 15 therebetween is clamped.
  • the blades 14 and spacer 15 are retained in the correct position by protrusions (not shown) in the housing and protrusions (not shown) on the spacer 15 which engage in slots 16 in the blades. Slots are used so as to allow relative movement of the blades and spacer during flexing.
  • the teeth of the comb-like portions 12 and 13 are interconnected by a web 17 which is sufficiently thin for the blade unit 10 to be flexible.
  • the blade unit further comprises a comb-like polyethylene oxide-containing moulding 18, the teeth 19 of which are positioned between the teeth of the cap portion 13, the width of the teeth 19 being less than the space between the teeth of the cap portion (when the blade unit is unflexed) so that the blade unit can flex concavely.
  • the teeth 19 of the polyethylene oxide-containing moulding 18 are interconnected by a web 20 which is adhesively secured to the back of the web 17. As can be seen from Figure 2, in the assembled condition, the teeth 19 of the polyethylene oxide-containing moulding 18 are level with the teeth 13 of the cap portion.
  • Figures 1 and 2 further illustrate a preferred manner of assembling the blade unit, that is the polyethylene oxide-containing moulding 18 is not separated from the sprue 21 with which it is moulded until the moulding 18 has been bonded to the housing 11; the sprue 21 is then cut away (see Figure 2).
  • the blade unit 10 is connected to a handle 22 by means of three posts 23,24 depending integrally from the underside of the housing 11 which slidably engage in corresponding slots 25,26 in the head of the handle.
  • the posts 23,24 extend perpendicularly to the parallel planes of the blades and are positioned directly underneath the blade edges, i.e. passing through a region bordered by the blade edges.
  • the central post 24 is guided for rectilinear sliding movement within the slot 26; this post therefore centralises the unit longitudinally, without interfering with its flexure.
  • the outer posts 23 each have a pivot pin 27 projecting through them, parallel with the axis or axes of flexure of the blade unit, and these pins 27 are received in and guided by elongate slots 28 formed in the walls of the slots 26, so that they accommodate flexure of the blade unit, which is accompanied by movement of the ends of the unit towards and away from each other.
  • the pins 27 also prevent withdrawal of the blade unit from the handle.
  • the posts 23 are set in from the ends of the unit so as to permit the blade unit to flex convexly if one or both ends encounter larger forces during shaving than the medial portion of the unit.
  • deflection from the unflexed plane is limited by abutment of the underside of the platform with the centre of the head of the handle.
  • deflection of the outer portions of the blade unit is limited by abutment of the underside of the outer portions of the platform with outer portions of the handle head.
  • the concave deflection is limited to 2.5 mm at the centre, and the convex deflection is limited to 3 mm at the ends, of the blade unit.
  • the spacing of the outer posts 23 is preferably 2/3 of the overall length of the blade unit.
  • the main forces encountered during shaving are directed perpendicular to the plane of the blades (or blade) and passing through a region bordered by the cutting edges of a tandem blade unit. Since the posts 23,24 are aligned with those forces, they do not encounter any substantial bending moment which would otherwise tend to tilt them and create a tendency for the pins 27 to bind in the guide slots 28.
  • the polyethylene oxide-containing moulding can be made in situ by a two stage moulding process, namely a process in which different materials are moulded into a single component by moulding one material first and then moulding the second in situ .
  • This process can be used to mould the housing and the polyethylene oxide-containing moulding as a single component (spacing pieces being inserted into the mould before the injection of the polyethylene oxide-containing mixture to provide the desired gaps between the cap teeth and the teeth of the polyethylene oxide-containing moulding. This eliminates the need for adhesive bonding and the reduction in the flexibility of the unit which might arise from the use of an adhesive.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Cosmetics (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Knives (AREA)

Abstract

A safety razor having one or more blades (14) seated between a cap (11) and guard (12), said guard cap and guard having a comb-like configuration in which a comb-like moulding (18) of a mixture of polyethylene oxide and a structural polymer, such as polystyrene, is positioned between the teeth (13) of the comb-like cap portion, the teeth (19) of the polyethylene oxide-containing moulding being narrower than the space between the teeth of the cap portion so that the blade unit can flex concavely.

Description

  • This invention is concerned with safety razors which comprise a flexible razor blade unit secured to a handle by connecting means arranged to permit flexure of the unit when the razor is used.
  • The blade unit is flexible in the sense that it is readily flexible, in response to forces encountered during normal use, about an axis or axes parallel with the plane of the blade unit and extending substantially perpendicular to the cutting edge(s) of the blade(s). Safety razors of this kind are described for example, in British Specifications 1589591 and 2119690.
  • One form of blade unit for such a safety razor comprises a flexible blade or tandem flexible blades with a flexible spacer therebetween, which blade or blades and spacer are mounted in a moulded plastics housing providing a comb-like guard portion and a comb-like cap portion, the teeth of the two comb-like portions being interconnected by a web which is sufficiently thin to be flexible. The blade unit is connected to a razor handle by connecting means which permit flexing of the blade unit in use.
  • We have now developed an improvement of such a safety razor in which a comb-like moulding of a mixture of polyethylene oxide and a structural polymer, such as polystyrene, is positioned between the teeth of the comb-like cap portion, the teeth of the polyethylene oxide-containing moulding being narrower than the space between the teeth of the cap portion so that the blade unit can flex concavely.
  • According to the present invention, there is provided a safety razor which comprises a razor blade unit which is readily flexible, in response forces encountered during normal use, about an axis or axes parallel with the plane of the blade or blades and extending substantially perpendicular to the cutting edge(s) thereof, a handle, and connecting means connecting the blade unit to the handle which means permit flexing of the blade unit, the blade unit comprising a moulded plastics housing providing a comb-like guard portion and a comb-like cap portion between which the blade or tandem blades with a spacer therebetween is/are clamped, the teeth of the two comb-like portions being interconnected by a web which is sufficiently thin to be flexible, and the blade unit further comprising a comb-like moulding of a mixture of polyethylene oxide and a structural polymer, positioned between the teeth of the comb-like cap portion, the teeth of the polyethylene oxide-containing moulding being narrower than the space between the teeth of the cap portion so that the blade unit can flex concavely.
  • The teeth of the polyethylene oxide-containing moulding are preferably level with or project above the teeth of the cap portion.
  • The use of inserts formed of a mixture of polyethylene oxide and a structural polymer, such as polystyrene, in the cap and/or the guard portions of razors and blade units to improve shaving performance is known and has been described, for example, in British Specification 2024082. Such inserts typically contain, by weight, 80% of polyethylene oxide and 20% of structural polymer. The present invention provides a particularly convenient way of incorporating polyethylene oxide-containing inserts in a flexible blade unit of the kind described.
  • A currently preferred embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
    • Figure 1 is a perspective exploded view of the razor, and
    • Figure 2 is a similar view of the assembled razor.
  • The illustrated razor comprises a flexible blade unit 10 which comprises a moulded plastics housing 11 (made, for example, from polystyrene) which has a comb-like guard portion 12 and a comb-like cap portion 13 between which a combination of tandem single edged razor blades 14 with a spacer 15 therebetween is clamped. The blades 14 and spacer 15 are retained in the correct position by protrusions (not shown) in the housing and protrusions (not shown) on the spacer 15 which engage in slots 16 in the blades. Slots are used so as to allow relative movement of the blades and spacer during flexing. The teeth of the comb- like portions 12 and 13 are interconnected by a web 17 which is sufficiently thin for the blade unit 10 to be flexible.
  • The blade unit further comprises a comb-like polyethylene oxide-containing moulding 18, the teeth 19 of which are positioned between the teeth of the cap portion 13, the width of the teeth 19 being less than the space between the teeth of the cap portion (when the blade unit is unflexed) so that the blade unit can flex concavely.
  • The teeth 19 of the polyethylene oxide-containing moulding 18 are interconnected by a web 20 which is adhesively secured to the back of the web 17. As can be seen from Figure 2, in the assembled condition, the teeth 19 of the polyethylene oxide-containing moulding 18 are level with the teeth 13 of the cap portion.
  • Figures 1 and 2 further illustrate a preferred manner of assembling the blade unit, that is the polyethylene oxide-containing moulding 18 is not separated from the sprue 21 with which it is moulded until the moulding 18 has been bonded to the housing 11; the sprue 21 is then cut away (see Figure 2).
  • The blade unit 10 is connected to a handle 22 by means of three posts 23,24 depending integrally from the underside of the housing 11 which slidably engage in corresponding slots 25,26 in the head of the handle. The posts 23,24 extend perpendicularly to the parallel planes of the blades and are positioned directly underneath the blade edges, i.e. passing through a region bordered by the blade edges. The central post 24 is guided for rectilinear sliding movement within the slot 26; this post therefore centralises the unit longitudinally, without interfering with its flexure. The outer posts 23 each have a pivot pin 27 projecting through them, parallel with the axis or axes of flexure of the blade unit, and these pins 27 are received in and guided by elongate slots 28 formed in the walls of the slots 26, so that they accommodate flexure of the blade unit, which is accompanied by movement of the ends of the unit towards and away from each other. The pins 27 also prevent withdrawal of the blade unit from the handle.
  • The posts 23 are set in from the ends of the unit so as to permit the blade unit to flex convexly if one or both ends encounter larger forces during shaving than the medial portion of the unit.
  • In order to protect the blade unit from damage due to excessive flexure in both concave and convex modes it has been found necessary to limit deflection both at the centre and at the ends of the cartridge.
  • In the concave mode, deflection from the unflexed plane is limited by abutment of the underside of the platform with the centre of the head of the handle. In the convex mode, deflection of the outer portions of the blade unit is limited by abutment of the underside of the outer portions of the platform with outer portions of the handle head.
  • In a particular embodiment the concave deflection is limited to 2.5 mm at the centre, and the convex deflection is limited to 3 mm at the ends, of the blade unit. The spacing of the outer posts 23 is preferably 2/3 of the overall length of the blade unit.
  • The main forces encountered during shaving are directed perpendicular to the plane of the blades (or blade) and passing through a region bordered by the cutting edges of a tandem blade unit. Since the posts 23,24 are aligned with those forces, they do not encounter any substantial bending moment which would otherwise tend to tilt them and create a tendency for the pins 27 to bind in the guide slots 28.
  • Whilst we have described an embodiment in which the polyethylene oxide-containing moulding is made separately from the housing 11 and is adhesively bonded to the latter, the polyethylene oxide-containing moulding can be made in situ by a two stage moulding process, namely a process in which different materials are moulded into a single component by moulding one material first and then moulding the second in situ. This process can be used to mould the housing and the polyethylene oxide-containing moulding as a single component (spacing pieces being inserted into the mould before the injection of the polyethylene oxide-containing mixture to provide the desired gaps between the cap teeth and the teeth of the polyethylene oxide-containing moulding. This eliminates the need for adhesive bonding and the reduction in the flexibility of the unit which might arise from the use of an adhesive.

Claims (2)

  1. A safety razor which comprises a razor blade unit (10) which is readily flexible, in response to forces encountered during normal use, about an axis or axes parallel with the plane of the blade or blades (14) and extending substantially perpendicular to the cutting edge(s) thereof, a handle, and connecting means connecting the blade unit to the handle which means permit flexing of the blade unit, the blade unit comprising a moulded plastics housing providing a comb-like guard portion (12) and a comb-like cap portion (13) between which the blade or tandem blades (14) with a spacer (15) therebetween is clamped, the teeth of the two comb-like portions (12, 13) being interconnected by a web (17) which is sufficiently thin to be flexible and the blade unit (10) further comprising a comb-like moulding (18) of a mixture of polyethylene oxide and a structural polymer positioned between the teeth of the comb-like cap portion (13), the teeth (19) of the polyethylene oxide-containing moulding (18) being narrower than the space between the teeth of the cap portion (13) so that the blade unit (10) can flex concavely.
  2. A razor according to claim 1, in which the teeth of the polyethylene oxide-containing moulding (18) are level with or project above the teeth of the cap portion (13).
EP91920238A 1990-10-22 1991-10-10 Safety razors Expired - Lifetime EP0554367B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB909022945A GB9022945D0 (en) 1990-10-22 1990-10-22 Safety razors
GB9022945 1990-10-22
PCT/US1991/007468 WO1992006827A1 (en) 1990-10-22 1991-10-10 Safety razors

Publications (3)

Publication Number Publication Date
EP0554367A1 EP0554367A1 (en) 1993-08-11
EP0554367A4 EP0554367A4 (en) 1993-12-01
EP0554367B1 true EP0554367B1 (en) 1996-04-10

Family

ID=10684149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91920238A Expired - Lifetime EP0554367B1 (en) 1990-10-22 1991-10-10 Safety razors

Country Status (9)

Country Link
EP (1) EP0554367B1 (en)
JP (1) JP3117711B2 (en)
AU (1) AU643097B2 (en)
BR (1) BR9107004A (en)
CA (1) CA2092532C (en)
DE (1) DE69118711T2 (en)
GB (1) GB9022945D0 (en)
MX (1) MX9101688A (en)
WO (1) WO1992006827A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ243908A (en) * 1991-08-16 1994-12-22 Beth Israel Hospital Assn Mutant l3t4 protein which facilitates hiv infection; transgenic mouse
EP0655027B1 (en) * 1992-08-13 1998-04-29 Warner-Lambert Company Shaving aid with increased flexibility
GB2360479A (en) * 2000-03-03 2001-09-26 Enda Keaveney Improvements in or relating to a razor
EP1501115B1 (en) 2003-07-14 2009-07-01 FEI Company Dual beam system
US7748121B2 (en) * 2005-05-06 2010-07-06 Eveready Battery Company, Inc. Razor blade and support assembly
US9221185B2 (en) 2008-09-10 2015-12-29 The Gillette Company Shaving razors and cartridges
US8209867B2 (en) 2008-10-02 2012-07-03 The Gillette Company Shaving razors and cartridges
JP5702552B2 (en) 2009-05-28 2015-04-15 エフ イー アイ カンパニＦｅｉ Ｃｏｍｐａｎｙ Control method of dual beam system
US8726518B2 (en) 2010-03-16 2014-05-20 The Gillette Company Shaving razors and cartridges
US9492933B2 (en) 2011-09-30 2016-11-15 The Gillette Company Guard for a shaving razor
JP6976674B1 (en) * 2021-10-25 2021-12-08 株式会社貝印刃物開発センター Plow razor for delicate zone

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516320A (en) * 1983-04-28 1985-05-14 Warner-Lambert Company Dynamic razor
GB8717216D0 (en) * 1987-07-21 1987-08-26 Gillette Co Safety razors
US5003694A (en) * 1987-10-30 1991-04-02 Warner-Lambert Company Flexible razor head
US4976028A (en) * 1987-10-30 1990-12-11 Warner-Lambert Company Flexible razor head
US5070612A (en) * 1991-05-06 1991-12-10 Michael Abatemarco Razor blade assembly

Also Published As

Publication number Publication date
EP0554367A4 (en) 1993-12-01
WO1992006827A1 (en) 1992-04-30
JPH06502332A (en) 1994-03-17
JP3117711B2 (en) 2000-12-18
MX9101688A (en) 1992-06-05
DE69118711D1 (en) 1996-05-15
AU8950391A (en) 1992-05-20
EP0554367A1 (en) 1993-08-11
BR9107004A (en) 1993-08-24
AU643097B2 (en) 1993-11-04
CA2092532C (en) 1998-12-15
GB9022945D0 (en) 1990-12-05
DE69118711T2 (en) 1996-12-12
CA2092532A1 (en) 1992-04-23

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