EP0366139B1 - Improvements in or relating to safety razors - Google Patents
Improvements in or relating to safety razors Download PDFInfo
- Publication number
- EP0366139B1 EP0366139B1 EP19890119937 EP89119937A EP0366139B1 EP 0366139 B1 EP0366139 B1 EP 0366139B1 EP 19890119937 EP19890119937 EP 19890119937 EP 89119937 A EP89119937 A EP 89119937A EP 0366139 B1 EP0366139 B1 EP 0366139B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- projections
- fact
- base
- skin
- pillars
- 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
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Images
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
- B26B21/4012—Housing details, e.g. for cartridges
- B26B21/4018—Guard elements
-
- 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
- B26B21/4012—Housing details, e.g. for cartridges
- B26B21/4025—Cap elements
Definitions
- This invention relates to razors having one or more blades and skin engaging surfaces arranged ahead of and/or behind the blade edge or edges.
- the invention is applicable to razors of various forms, such as so-called 3-piece razors, one-piece, or disposable razors and to razors in which the head is formed by a replaceable blade cartridge.
- the skin engaging surfaces are formed as cap and guard members, the cap member being positioned behind the blade edges(s) and the guard member ahead of the edge(s).
- the present invention resides broadly in providing the skin engaging cap and/or guard surfaces with configurations or textures designed to promote pleasant tactile sensations, in use of the razors, which tend to mask the sensations caused by contact of the blade edge(s) with the skin and more significantly with the facial hairs as they are severed.
- European Patent Application 0 254 491 published 27/01/88 discloses a guard bar for a razor head having closely spaced knurls with apices defining a discontinuous upper surface.
- a safety razor having one or more blades and a skin-engaging surface such as guard or cap having projections extending therefrom, characterized by the fact that the projections are upstanding straight filaments extending throughout their length away from the respective surface and present at a density of at least 100 per sq. mm, said filaments having a uniform length of 0.3 to 2.00 mm and diameters in the range of 1.5 to 3.2 x 10 -2 mm.
- the invention also resides in a safety razor in which the projections comprise longitudinal fins generally parallel to the blade edge(s) and flexible under normal shaving forces in directions transverse to the blade edge(s), and having a height in the range of 0.5 to 2.5 mm, a ratio of height to base thickness in the range of 2:1 to 5:1, and a spacing between adjacent longitudinal rows of 0.3 to 1.5 mm.
- the invention also resides in a safety razor in which the projections comprise mutually transverse walls tapering to a thin edge, some of said walls being generally parallel to the blade edges and some of said walls being generally perpendicular to the blade edge so as to form a plurality of square cells 0.3 to 1.0 mm across, 0.5 to 2.5 mm high and having an aspect ratio of height to thickness at the base of 2:1 to 5:1.
- the invention also resides in a safety razor in which the projections comprise a plurality of individual upstanding pillars which are relatively flexible or are set in an elastomeric base which permits flexure of the pillars about their lower ends, the pillars being arranged in a plurality of parallel rows with a spacing between pillars in each row, and between adjacent longitudinal rows, in the range of 0.6 to 1.5 mm.
- the skin engaging surfaces of the razor head or cartridge are provided in one form or another with projections whose function is to provide frequent stimulation of the individual nerve zones at a low but adequate pressure level.
- the pressures are controlled by making the projections flexible and by varying their density to achieve sufficient but not excessive stimuli.
- FIG. 1 is a perspective view illustrating a cartridge body 1 of moulded construction (usually composed of a number of individual mouldings) in which are permanently secured a pair of blades 2, 3 whose cutting edges are disposed to act in tandem upon the skin.
- the body is formed to provide a guard member 4 and a cap member 6 having skin engaging surfaces 7 and 8, respectively, to engage the skin ahead of and behind the blade edges.
- one or both of the surfaces 7 and 8 is or are provided with a configured surface essentially comprising a plurality of spaced projections.
- the surfaces are formed by spray flock coatings, e.g. of nylon, acetate or acrylic filaments having lengths of 0.3 to 2.00, and diameters of (1.5 to 3.2) x 10 -2 .
- the filaments are applied at a density of 100 to 500 per sq. mm.
- the filaments may be disposed perpendicular to the skin engaging surface in question, or may be inclined up to 60° from the perpendicular, either forwardly or rearwardly relative to the shaving direction, and they may be orientated differently in different regions of the skin engaging surfaces.
- the surface is formed with a square grid pattern of mutually transverse walls 11, each tapering to a very thin edge.
- Each square cell 12 thus formed may be some 0.3 to 1.0 across, with its walls 0.5 to 2.5 high and with an "aspect ratio" of height to thickness of base in the range of 2:1 to 5:1.
- the structure may be completely open, as shown in Fig. 2 or, as illustrated in Fig. 3, it may have a continuous base 13.
- the individual projections 11A are spaced apart in respective, mutually transverse rows to form rectangular cells open at their corners and the base 13 has apertures 14 at the intersection of each group of four adjacent projections to facilitate clearance of shaving debris.
- the corresponding projections are formed as continuous longitudinal fins 11B.
- the fins may be spaced apart by 0.3 to 1.0, with a height of 0.5 to 2.5 and an aspect ratio in the range 2:1 to 5:1.
- Fig. 5 the fins are perpendicular to the base 13 but in Fig. 6 they are shown inclined at an angle of about 30° or more to the perpendicular, and forwardly relative to the shaving direction, indicated by the arrow 'S'.
- the fins may alternatively be set to slope rearwardly relative to shaving direction at an angle of up to 30° beyond the perpendicular.
- Fig. 7 illustrates a variant of Fig. 5 in which the fins 11C, instead of being continuous, are interrupted at intervals along their lengths. They may also be inclined, either forwardly or rearwardly, as described in relation to Fig. 6.
- the skin engaging surfaces are formed by mouldings of synthetic elastomeric materials. They may be formed integrally with the basic cap or guard structures, or as separate mouldings which are then attached to underlying cap and guard structures. This latter approach lends itself particularly well, but not exclusively, to incorporation in razor cartridges of the conventional form currently marketed widely in the UK and elsewhere.
- Fig. 8 illustrates another form of the invention in which the skin engaging surfaces are formed with individual pillars 14.
- the pillars may have a height in the range of 0.5 to 2.5 with an aspect ratio of height to base diameter of 2:1 to 5:1 and with a spacing between adjacent pillars in each row and between adjacent rows of pillars of 0.6 to 1.5.
- the base 13 and pillars 14 may be integrally moulded in one material which is relatively flexible, or the pillars might be made of a more rigid material set in an elastomeric base 13 which permits flexure of the individual pillars about their lower ends.
- the precise arrangement and dimensioning of the fins, walls, pillars or other projections will be dependent in part on the flexibility of the particular materials selected, which will normally have a hardness of less than 90 Shore A.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dry Shavers And Clippers (AREA)
- Toilet Supplies (AREA)
- Cosmetics (AREA)
Description
- This invention relates to razors having one or more blades and skin engaging surfaces arranged ahead of and/or behind the blade edge or edges.
- The invention is applicable to razors of various forms, such as so-called 3-piece razors, one-piece, or disposable razors and to razors in which the head is formed by a replaceable blade cartridge.
- In conventional razors, the skin engaging surfaces are formed as cap and guard members, the cap member being positioned behind the blade edges(s) and the guard member ahead of the edge(s).
- The present invention resides broadly in providing the skin engaging cap and/or guard surfaces with configurations or textures designed to promote pleasant tactile sensations, in use of the razors, which tend to mask the sensations caused by contact of the blade edge(s) with the skin and more significantly with the facial hairs as they are severed.
- It is known that small discrete regions of the skin, approximately 1mm across on the face, are served by separate nerve networks so that it is not possible subjectively to distinguish between two separate points of pressure applied to the skin less than about 1mm apart. These areas can be stimulated repeatedly by a succession of pressure points moving across them. By controlling the pressure to a low but adequate level it can be assured that the sensation is pleasant, but it has been found, surprisingly, that this raises the threshold stimulus level for discomfort.
- European Patent Application 0 254 491 published 27/01/88 discloses a guard bar for a razor head having closely spaced knurls with apices defining a discontinuous upper surface.
- According to the present invention, there is provided a safety razor having one or more blades and a skin-engaging surface such as guard or cap having projections extending therefrom, characterized by the fact that the projections are upstanding straight filaments extending throughout their length away from the respective surface and present at a density of at least 100 per sq. mm, said filaments having a uniform length of 0.3 to 2.00 mm and diameters in the range of 1.5 to 3.2 x 10-2 mm.
- The invention also resides in a safety razor in which the projections comprise longitudinal fins generally parallel to the blade edge(s) and flexible under normal shaving forces in directions transverse to the blade edge(s), and having a height in the range of 0.5 to 2.5 mm, a ratio of height to base thickness in the range of 2:1 to 5:1, and a spacing between adjacent longitudinal rows of 0.3 to 1.5 mm.
- The invention also resides in a safety razor in which the projections comprise mutually transverse walls tapering to a thin edge, some of said walls being generally parallel to the blade edges and some of said walls being generally perpendicular to the blade edge so as to form a plurality of square cells 0.3 to 1.0 mm across, 0.5 to 2.5 mm high and having an aspect ratio of height to thickness at the base of 2:1 to 5:1.
- The invention also resides in a safety razor in which the projections comprise a plurality of individual upstanding pillars which are relatively flexible or are set in an elastomeric base which permits flexure of the pillars about their lower ends, the pillars being arranged in a plurality of parallel rows with a spacing between pillars in each row, and between adjacent longitudinal rows, in the range of 0.6 to 1.5 mm.
- In the embodiments of the invention described below, the skin engaging surfaces of the razor head or cartridge are provided in one form or another with projections whose function is to provide frequent stimulation of the individual nerve zones at a low but adequate pressure level. The pressures are controlled by making the projections flexible and by varying their density to achieve sufficient but not excessive stimuli.
- Some embodiments of the invention will now be described in detail, by way of example, with reference to the accompanying drawings, in which:
- Fig. 1 is a perspective view of a conventional form of replaceable razor cartridge to which the invention may be applied;
- Figs. 2 to 8 each comprise a fragmentary view, on a greatly enlarged scale, of a skin engaging surface in accordance with the invention.
- A cartridge of conventional form is illustrated in Figure 1, which is a perspective view illustrating a cartridge body 1 of moulded construction (usually composed of a number of individual mouldings) in which are permanently secured a pair of
blades 2, 3 whose cutting edges are disposed to act in tandem upon the skin. The body is formed to provide aguard member 4 and acap member 6 having skin engaging surfaces 7 and 8, respectively, to engage the skin ahead of and behind the blade edges. - In accordance with the invention, one or both of the surfaces 7 and 8 is or are provided with a configured surface essentially comprising a plurality of spaced projections.
- All linear dimensions specified herein are in mm.
- In one embodiment of the invention, the surfaces are formed by spray flock coatings, e.g. of nylon, acetate or acrylic filaments having lengths of 0.3 to 2.00, and diameters of (1.5 to 3.2) x 10-2. The filaments are applied at a density of 100 to 500 per sq. mm. The filaments may be disposed perpendicular to the skin engaging surface in question, or may be inclined up to 60° from the perpendicular, either forwardly or rearwardly relative to the shaving direction, and they may be orientated differently in different regions of the skin engaging surfaces.
- Examples of various possible forms of moulded configurations are illustrated in Figs. 2 to 8, respectively.
- In Fig. 2, the surface is formed with a square grid pattern of mutually
transverse walls 11, each tapering to a very thin edge. Eachsquare cell 12 thus formed may be some 0.3 to 1.0 across, with its walls 0.5 to 2.5 high and with an "aspect ratio" of height to thickness of base in the range of 2:1 to 5:1. The structure may be completely open, as shown in Fig. 2 or, as illustrated in Fig. 3, it may have acontinuous base 13. - In Fig. 4, the individual projections 11A are spaced apart in respective, mutually transverse rows to form rectangular cells open at their corners and the
base 13 hasapertures 14 at the intersection of each group of four adjacent projections to facilitate clearance of shaving debris. - In Figs. 5 and 6, the corresponding projections are formed as continuous longitudinal fins 11B. The fins may be spaced apart by 0.3 to 1.0, with a height of 0.5 to 2.5 and an aspect ratio in the range 2:1 to 5:1.
- In Fig. 5 the fins are perpendicular to the
base 13 but in Fig. 6 they are shown inclined at an angle of about 30° or more to the perpendicular, and forwardly relative to the shaving direction, indicated by the arrow 'S'. - The fins may alternatively be set to slope rearwardly relative to shaving direction at an angle of up to 30° beyond the perpendicular.
- Fig. 7 illustrates a variant of Fig. 5 in which the fins 11C, instead of being continuous, are interrupted at intervals along their lengths. They may also be inclined, either forwardly or rearwardly, as described in relation to Fig. 6.
- The action of the above described fins is as follows. Those arranged parallel to the blade edges interact with the skin either directly or through contact with facial hair to produce pleasant masking sensations, while those arranged perpendicular to the edges help to control the pressure of the parallel fins on the skin.
- In each of the cases illustrated in Figs. 2 to 7, the skin engaging surfaces are formed by mouldings of synthetic elastomeric materials. They may be formed integrally with the basic cap or guard structures, or as separate mouldings which are then attached to underlying cap and guard structures. This latter approach lends itself particularly well, but not exclusively, to incorporation in razor cartridges of the conventional form currently marketed widely in the UK and elsewhere.
- Fig. 8 illustrates another form of the invention in which the skin engaging surfaces are formed with
individual pillars 14. The pillars may have a height in the range of 0.5 to 2.5 with an aspect ratio of height to base diameter of 2:1 to 5:1 and with a spacing between adjacent pillars in each row and between adjacent rows of pillars of 0.6 to 1.5. Thebase 13 andpillars 14 may be integrally moulded in one material which is relatively flexible, or the pillars might be made of a more rigid material set in anelastomeric base 13 which permits flexure of the individual pillars about their lower ends. - With all of the above described moulded constructions, the precise arrangement and dimensioning of the fins, walls, pillars or other projections will be dependent in part on the flexibility of the particular materials selected, which will normally have a hardness of less than 90 Shore A.
- It will also be possible to combine different surfaces on different regions of the razor, say one type on the cap member and another on the guard member as well as to combine different surfaces on different regions of either member.
Claims (9)
- A safety razor having one or more blades (2,3) and a skin-engaging surface such as guard (7) or cap (8) having projections extending therefrom, characterized by the fact that the projections are upstanding straight filaments extending throughout their length away from the respective surface and present at a density of at least 100 per sq. mm, said filaments having a uniform length of 0.3 to 2.00 mm and diameters in the range of 1.5 to 3.2 x 10-2 mm.
- A safety razor having one or more blades (2,3) and a skin-engaging surface such as guard (7) or cap (8) having projections extending therefrom, characterized by the fact that the projections comprise longitudinal fins (11B, Figs. 5-6) generally parallel to the blade edge(s) and flexible under normal shaving forces in directions transverse to the blade edge(s), and having a height in the range of 0.5 to 2.5 mm, a ratio of height to base thickness in the range of 2:1 to 5:1, and a spacing between adjacent longitudinal fins of 0.3 to 1.5 mm.
- A razor according to claim 2, characterized by the fact that the fins (11B) slope upwardly and forwardly or rearwardly from their bases at an acute angle to the shaving direction.
- A razor according to claim 2, characterized by the fact that the fins (11C, Fig. 7) are interrupted at intervals along their lengths.
- A safety razor having one or more blades (2,3) and a skin-engaging surface such as guard (7) or cap (8) having projections extending therefrom, characterized by the fact that the projections comprise mutually transverse walls (11, Figs. 2-3) tapering to a thin edge, some of said walls being generally parallel to the blade edges and some of said walls being generally perpendicular to the blade edge so as to form a plurality of square cells 0.3 to 1.0 mm across, 0.5 to 2.5 mm high and having an aspect ratio of height to thickness at the base of 2:1 to 5:1.
- A razor according to claim 5, characterized by the fact that the walls (11A, Fig. 4) are formed integrally with a base (13) having apertures (14) at the intersection of each group of four adjacent walls.
- A safety razor having one or more blades (2,3) and a skin-engaging surface such as guard (7) or cap (8) having projections extending therefrom, characterized by the fact that the projections comprise a plurality of individual upstanding pillars (14, Fig. 8) which are relatively flexible or are set in an elastomeric base which permits flexure of the pillars about their lower ends, the pillars being arranged in a plurality of parallel rows with a spacing between pillars in each row, and between adjacent longitudinal rows, in the range of 0.6 to 1.5 mm.
- A razor according to any one of the preceding claims, characterized by the fact that the projections are of a synthetic elastomeric material.
- A razor according to claim 8, characterized by the fact that the projections are individually set in a base of synthetic elastomeric material which permits deflection about their lower ends, the projections being of a more rigid material than the base.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB888825268A GB8825268D0 (en) | 1988-10-28 | 1988-10-28 | Safety razors |
GB8825268 | 1988-10-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0366139A2 EP0366139A2 (en) | 1990-05-02 |
EP0366139A3 EP0366139A3 (en) | 1990-07-25 |
EP0366139B1 true EP0366139B1 (en) | 1996-09-18 |
Family
ID=10645939
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890119937 Expired - Lifetime EP0366139B1 (en) | 1988-10-28 | 1989-10-26 | Improvements in or relating to safety razors |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0366139B1 (en) |
JP (1) | JP2809779B2 (en) |
BR (1) | BR8907724A (en) |
CA (1) | CA2000772C (en) |
DE (1) | DE68927220T2 (en) |
ES (1) | ES2091759T3 (en) |
GB (1) | GB8825268D0 (en) |
GR (1) | GR3021079T3 (en) |
SG (1) | SG48421A1 (en) |
WO (1) | WO1990005047A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015131496A1 (en) * | 2014-03-05 | 2015-09-11 | 黄志坚 | Shaver cutter head |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9022128D0 (en) * | 1990-10-11 | 1990-11-21 | Gillette Co | Safety razors |
USRE36816E (en) * | 1992-05-13 | 2000-08-15 | The Gillette Company | Guard for razor blade assembly |
US5249361A (en) * | 1992-05-13 | 1993-10-05 | The Gillette Company | Guard for razor blade assembly |
US5416973A (en) * | 1993-09-30 | 1995-05-23 | The Gillette Company | Razors |
US6944952B1 (en) | 1994-07-01 | 2005-09-20 | The Gillette Company | Shaving system |
US6594904B1 (en) | 1994-07-01 | 2003-07-22 | The Gillette Company | Shaving system |
WO1996001171A1 (en) * | 1994-07-01 | 1996-01-18 | The Gillette Company | Skin engaging member for razor blade assembly |
US5903979A (en) * | 1994-07-13 | 1999-05-18 | The Gillette Company | Safety razors |
US6298558B1 (en) | 1994-10-31 | 2001-10-09 | The Gillette Company | Skin engaging member |
GB9502268D0 (en) * | 1995-02-06 | 1995-03-29 | Gillette Co | Razors |
US5953819A (en) * | 1995-02-06 | 1999-09-21 | The Gillette Company | Razors |
US5689883A (en) * | 1995-05-08 | 1997-11-25 | Warner-Lambert Company | Shaving implement |
US5794343A (en) * | 1997-05-12 | 1998-08-18 | The Gillette Company | Razor blade assembly |
US6014918A (en) * | 1998-10-28 | 2000-01-18 | Warner & Lambert Company | Transcutaneous electric nerve stimulator razor system |
US6167625B1 (en) * | 1999-05-18 | 2001-01-02 | Warner-Lambert Company | Shaving implement |
US20110203113A1 (en) * | 2010-02-25 | 2011-08-25 | Xiandong Wang | Razor Cartridge With Improved Cap Structure |
USD965887S1 (en) | 2020-05-20 | 2022-10-04 | The Gillette Company Llc | Shaving razor guard bar |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2068085A (en) * | 1935-02-27 | 1937-01-19 | Nathan M Stanley | Safety razor |
US3138865A (en) * | 1960-08-13 | 1964-06-30 | Meyer Eugen | Safety razor having skin-stretching and guiding means |
US3909939A (en) * | 1973-08-23 | 1975-10-07 | Colombo Winifred M | Safety razor having a row of short convergently slanted counter-stretching tension grooves extending along the guard bar |
GB1557177A (en) * | 1975-09-12 | 1979-12-05 | Wilkinson Sword Ltd | Shaving units |
US4189832A (en) * | 1978-06-19 | 1980-02-26 | The Gillette Company | Shaving implement |
NL8000884A (en) * | 1980-02-13 | 1981-09-16 | Philips Nv | SHAVER. |
US4741103A (en) * | 1986-07-25 | 1988-05-03 | Warner Lambert Company | Razor for shaving a face having pseudofolliculitis barbae |
-
1988
- 1988-10-28 GB GB888825268A patent/GB8825268D0/en active Pending
-
1989
- 1989-10-13 JP JP1511539A patent/JP2809779B2/en not_active Expired - Fee Related
- 1989-10-13 BR BR898907724A patent/BR8907724A/en not_active IP Right Cessation
- 1989-10-13 WO PCT/US1989/004588 patent/WO1990005047A1/en unknown
- 1989-10-16 CA CA 2000772 patent/CA2000772C/en not_active Expired - Lifetime
- 1989-10-26 EP EP19890119937 patent/EP0366139B1/en not_active Expired - Lifetime
- 1989-10-26 ES ES89119937T patent/ES2091759T3/en not_active Expired - Lifetime
- 1989-10-26 SG SG1996009551A patent/SG48421A1/en unknown
- 1989-10-26 DE DE1989627220 patent/DE68927220T2/en not_active Expired - Lifetime
-
1996
- 1996-09-19 GR GR960402326T patent/GR3021079T3/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015131496A1 (en) * | 2014-03-05 | 2015-09-11 | 黄志坚 | Shaver cutter head |
Also Published As
Publication number | Publication date |
---|---|
DE68927220T2 (en) | 1997-04-03 |
BR8907724A (en) | 1991-07-30 |
SG48421A1 (en) | 1998-04-17 |
CA2000772A1 (en) | 1990-04-28 |
DE68927220D1 (en) | 1996-10-24 |
CA2000772C (en) | 1997-03-04 |
EP0366139A3 (en) | 1990-07-25 |
GR3021079T3 (en) | 1996-12-31 |
JP2809779B2 (en) | 1998-10-15 |
JPH04502413A (en) | 1992-05-07 |
EP0366139A2 (en) | 1990-05-02 |
ES2091759T3 (en) | 1996-11-16 |
GB8825268D0 (en) | 1988-11-30 |
WO1990005047A1 (en) | 1990-05-17 |
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