EP0929382A1 - Razor - Google Patents
RazorInfo
- Publication number
- EP0929382A1 EP0929382A1 EP97938045A EP97938045A EP0929382A1 EP 0929382 A1 EP0929382 A1 EP 0929382A1 EP 97938045 A EP97938045 A EP 97938045A EP 97938045 A EP97938045 A EP 97938045A EP 0929382 A1 EP0929382 A1 EP 0929382A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- fulcrum
- safety razor
- frame
- unit according
- 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.)
- Granted
Links
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
- B26B21/08—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 involving changeable blades
- B26B21/14—Safety razors with one or more blades arranged transversely to the handle
- B26B21/22—Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously
- B26B21/222—Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously with the blades moulded into, or attached to, a changeable unit
- B26B21/227—Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously with the blades moulded into, or attached to, a changeable unit with blades being resiliently mounted in the changeable unit
Definitions
- RAZOR This invention relates to safety razors, and in particular it is concerned with a blade unit for a safety razor.
- the blade units of the invention may be either cartridges which are mounted replaceably on a handle for use, or the shaving heads of disposable razors having blade carrying parts permanently attached to a handle.
- a safety razor cartridge as currently marketed comprises a generally rectangular moulded plastics frame with guard and cap surfaces on the lengthwise extending frame parts. Within the opening of the frame are a pair of blades arranged in tandem with their cutting edges parallel to each other and directed towards the guard surface.
- the blades are carried on respective supports to which they are fixedly attached, and the ends of the blade supports are slidably guided in grooves in the end walls of the frame to enable the blades to retract, under forces exerted on the blades during shaving. Springs act on the blades to urge them to a normal rest position.
- the shaving geometry of a blade unit is important in determining the shaving performance of the blade unit.
- the shaving geometry defines the position and orientation of the blades in relation to other skin contacting parts, in particular the guard and cap, of the blade unit.
- One parameter of the shaving geometry is the blade exposure, which is the perpendicular distance by which the edge of a blade protrudes above a shaving plane tangential to the surfaces of the skin contacting parts immediately in front of and behind the blade edge.
- the known blade unit described above has the blades mounted so that the exposure is reduced when loads of sufficient magnitude to overcome the force of the springs are exerted on the blades.
- the blade tangent angle is the angle at which the central plane of the blade intersects the tangent plane, the tangent plane being the plane which is tangent to the edge of the blade and to the surface of the skin contacting part next in front of the blade.
- the blade tangent angle of the first or primary blade is the angle of the blade to the tangent plane tangential to the guard surface and the edge of the primary blade.
- a safety razor blade unit having at least one blade mounted for independent movement relative to other skin contacting parts of the blade unit under forces exerted at the blade edge during shaving, wherein the or each blade is mounted to move to increase the blade tangent angle in response to load forces exerted on the blade during shaving.
- the blade unit includes a frame, and the or each blade is fixedly carried on a blade support, and the blade support is connected to the frame by means defining a fulcrum, the movement of the blade under load fulcrum being located closer to the blade edge than is the point where the tangent plane meets the skin contacting surface next in front of the blade. Also, the fulcrum lies in or closely adjacent to the tangent plane. This arrangement minimizes the changes in blade exposure as the blade tangent angle increases, and to the extent that the exposure of the blade does change it reduces as the blade tangent angle increases. Also, the angular displacement of the blade is largely insensitive to the drag forces on the blade, and the blade span, i.e.
- the distance between the blade edge and the skin contacting surface in front of the blade edge measured in the tangent plane does not change significantly as the blade tangent angle increases. It is expedient for the fulcrum to be spaced from the blade edge at a distance in the range of 0.2 mm to 0.6 mm.
- the blade or blades are initially set with a minimum blade tangent angle, and this angle increases under increasing load forces. As a consequence there is greater comfort as compared with other arrangements which provide the blade tangent angle to be initially set at a maximum.
- the blade supports can conveniently be coupled to the frame so that the fulcrum is fixed with respect to the frame, but this is not essential and it is also possible to allow a degree of controlled movement of the fulcrum.
- Figure 1 is a cross-section through a razor cartridge in accordance with the invention, the blades being shown in a normal rest position;
- Figure 2 shows the cartridge of Figure 1 with the blades in the position of maximum angular displacement
- FIG 3 is an exploded perspective view of the cartridge shown in Figure 1;
- Figure 4 is an enlarged detail showing part of a blade unit and its support;
- Figure 5 is a perspective view showing a modified blade mounting arrangement
- Figures 6A and 6B are perspective and end views showing an alternative blade mounting arrangement with a hinge
- Figures 7A and 7B are perspective and end views showing another alternative blade mounting arrangement with a shell bearing
- Figures 8A and 8B are perspective and end views showing a further alternative blade mounting arrangement with a moving fulcrum;
- Figures 9A and 9B show in perspective and end view a blade mounting arrangement including a four bar linkage, and
- Figure 9C shows this embodiment in a maximum blade displacement condition.
- the safety razor blade unit shown in Figures 1-4 is a shaving cartridge.
- the handle to which the cartridge is attached is not shown and may be of conventional form.
- the cartridge comprises a moulded plastics frame 1 of generally rectangular shape.
- the front rail of the frame includes a guard bar 2 and carries a guard strip 3 of elastomeric material having upstanding fins extending along the strip.
- the rear rail of the frame defines a cap surface 5 and carries a strip 6 of lubricating material.
- Three blades 7 with parallel edges are mounted in the frame between the guard bar 2 and cap surface 5 so that the blades pass in turn over the skin during shaving.
- Each blade is fixedly attached to a blade support 8, and as best seen in Figure 4, integral with each end of the blade support is a forwardly and upwardly inclined suspension arm 9 having a journal 10 at its free end.
- the journal axis is parallel to the edge of the blade and spaced forwardly therefrom at a distance of 0.2 to 0.6 mm.
- the journals are received in bearings defined by spring blocks 12 and the end walls of the cartridge frame.
- the spring blocks have connection elements 13 which engage with a snap fit in sockets formed in the frame walls, and integral with the spring blocks are spring fingers 14 which act on the undersides of the respective blades for urging the blades to their rest positions shown in Figure 1.
- Upwardly directed key elements 15 on the spring blocks are arranged to extend into slots formed in the end walls of the frame to retain the journals 10 in their bearings defined at the upper ends of these slots, as may be seen in Figures 1 and 2.
- each blade 7 is mounted in the cartridge frame 1 for pivotal movement about the axis defined by the journals 10, this axis being located between the blade edge, and the skin contacting member next in front of the blade, this axis being in or closely adjacent the tangent plane of the blade.
- the spring fingers 14 bias the blades to the rest position of Figure 1 in which the blades, or their support, abut against shoulders 18 formed on the frame end walls.
- the blade When a blade 7 is subjected to a load force, applied at the blade edge and directed substantially perpendicular to the shaving plane, and the load force is of sufficient magnitude to overcome the prestress in the spring fingers 14, the blade is caused to pivot so that the blade tangent angle gradually increases as the load force increases further.
- the blade exposure reduces, but only slightly if desired, the reduction in exposure could be compensated by arranging for the guard bar 2 to be itself spring mounted or to be elastically deformable so that it will be gradually depressed under the corresponding load force applied on the guard bar as the blades pivot under the load forces imparted on the blades.
- the cartridge construction is such that the blade tangent angles will increase with increasing force used by the razor user to press the razor against the skin being shaved.
- the suspension arms 9 and journals 10 can be formed as a separate moulded members 20 which can be formed with slots to receive the ends of the blade support 8.
- Figures 6A and 6B illustrate an arrangement in which a fulcrum about which a blade 7 is pivotable is formed by a living hinge 22 incorporated in a member 23 including the suspension arm 9.
- the member may be integral with the cartridge frame 1 or can be moulded separately and attached to it.
- the blade support is arcuate and end extensions 24 on the support are arranged to fit into correspondingly curved slots in the frame end walls to form a shell bearing defining the centre of pivotal movement of the blade 7.
- each of the blades it is not essential for each of the blades to be constrained to move about a fixed fulcrum or pivot axis.
- the suspension arms 9 showing integral with the blade support although they could be moulded separately and attached to the blade support as in Figure 5, have hooks 26 at their free forward ends. The hooks rest on cantilever support bars 27 fixed to the frame end walls and having substantially flat surfaces with opposite edges defining respective pivot axes.
- the suspension arms 9 and blade 7 pivot about the axis defined by the forward edges of the support bars 27, and during subsequent angular movement the pivoting takes place about the pivot axis defined by the rear edges of support bars.
- the blades 7 are supported by integrally moulded four bar linkage assemblies.
- a first link 30 forms the suspension arm 9, a second L-shaped link 31, is fixed to the cartridge frame, a third link 32 is connected to the suspension arm 9 by one living hinge 33 defining a fulcrum for movement of the blade 7, and to one end of the second link 31 by another living hinge 34, and a fourth link 35 of short length is connected by respective living hinges 36, 37 to the other end of the second link and to the first link.
- the link 30 moves about the fulcrum defined by the hinge 33.
- the fulcrums will be located substantially as described in relation to the embodiment of Figures 1-4 and as a consequence the desired effect of the blade tangent angels increasing as the load forces increase is obtained, while the blade spans do not change substantially, and the changes to the blade exposures are kept small.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9616402.5A GB9616402D0 (en) | 1996-08-05 | 1996-08-05 | Safety razors |
GB9616402 | 1996-08-05 | ||
PCT/US1997/013099 WO1998005478A1 (en) | 1996-08-05 | 1997-07-28 | Razor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0929382A1 true EP0929382A1 (en) | 1999-07-21 |
EP0929382B1 EP0929382B1 (en) | 2003-01-02 |
Family
ID=10798030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97938045A Expired - Lifetime EP0929382B1 (en) | 1996-08-05 | 1997-07-28 | Razor |
Country Status (17)
Country | Link |
---|---|
EP (1) | EP0929382B1 (en) |
JP (1) | JP4267071B2 (en) |
CN (1) | CN1142050C (en) |
AR (1) | AR008109A1 (en) |
AT (1) | ATE230331T1 (en) |
AU (1) | AU738107B2 (en) |
BR (1) | BR9710805A (en) |
CA (1) | CA2261759C (en) |
DE (1) | DE69718184T2 (en) |
EG (1) | EG21083A (en) |
ES (1) | ES2185982T3 (en) |
GB (1) | GB9616402D0 (en) |
ID (1) | ID19214A (en) |
MY (1) | MY132495A (en) |
RU (1) | RU2214902C2 (en) |
TW (1) | TW382609B (en) |
WO (1) | WO1998005478A1 (en) |
Families Citing this family (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6112412A (en) * | 1999-04-21 | 2000-09-05 | Warner-Lambert Company | Razor assembly and cartridge having improved wash-through |
US6138361A (en) * | 1999-04-21 | 2000-10-31 | Warner-Lambert Company | Pivotable razor assembly and cartridge |
US6182366B1 (en) | 1999-04-21 | 2001-02-06 | Warner-Lambert Company | Flexible razor assembly and cartridge |
US6772523B1 (en) | 1999-04-21 | 2004-08-10 | Eveready Battery Company, Inc. | Pivotable and flexible razor assembly and cartridge |
US6629475B1 (en) * | 2000-07-18 | 2003-10-07 | The Gillette Company | Razor blade |
EP1236547A3 (en) * | 2001-02-28 | 2003-04-02 | Warner-Lambert Company | Shaving system which actively flex a blade |
US7621203B2 (en) * | 2004-02-09 | 2009-11-24 | The Gillette Company | Shaving razors, and blade subassemblies therefor and methods of manufacture |
US7690122B2 (en) | 2004-03-11 | 2010-04-06 | The Gillette Company | Shaving razor with button |
AU2006290228B2 (en) * | 2005-09-14 | 2012-09-13 | Edgewell Personal Care Brands, Llc | Blade mounting members for a razor cartridge |
US7578217B2 (en) | 2005-10-26 | 2009-08-25 | The Gillette Company | Manufacturing razor blades |
US8607667B2 (en) | 2005-10-26 | 2013-12-17 | The Gillette Company | Manufacturing razor blades |
US8061237B2 (en) | 2005-10-26 | 2011-11-22 | The Gillette Company | Manufacturing razor blades |
JP4950506B2 (en) * | 2006-02-14 | 2012-06-13 | 株式会社貝印刃物開発センター | razor |
JP4950507B2 (en) | 2006-02-14 | 2012-06-13 | 株式会社貝印刃物開発センター | razor |
JP4977374B2 (en) * | 2006-02-14 | 2012-07-18 | 株式会社貝印刃物開発センター | razor |
ATE500039T1 (en) * | 2006-06-20 | 2011-03-15 | Bic Violex Sa | RAZOR BLADE UNIT HEAD AND RAZOR HAVING SUCH A BLADE UNIT |
US8262755B2 (en) | 2007-06-05 | 2012-09-11 | Air Products And Chemicals, Inc. | Staged membrane oxidation reactor system |
US8209867B2 (en) * | 2008-10-02 | 2012-07-03 | The Gillette Company | Shaving razors and cartridges |
WO2010069388A1 (en) | 2008-12-19 | 2010-06-24 | Bic-Violex Sa | Razor cartridge and mechanical razor comprising such a cartridge |
US8826543B2 (en) * | 2009-03-23 | 2014-09-09 | The Gillette Company | Manually actuable liquid dispensing razor |
US8061039B2 (en) * | 2009-05-19 | 2011-11-22 | The Gillette Company | Shaving cartridges having elongated skin contacting members |
US20100313426A1 (en) * | 2009-06-12 | 2010-12-16 | Terence Gordon Royle | Safety razor with pivot and rotation |
US9193080B2 (en) * | 2009-08-03 | 2015-11-24 | The Gillette Company | Shaving blade unit with self-leveling trimmer |
EP2366507B1 (en) | 2010-03-15 | 2015-05-13 | The Gillette Company | Razor cartridge |
CN102452094A (en) * | 2010-10-28 | 2012-05-16 | 吉列公司 | Hair removing kit for distributing liquid |
PL2537649T3 (en) * | 2011-06-21 | 2013-11-29 | Gillette Co | Razor cartridge with skin contact element |
CA2962748A1 (en) * | 2014-10-20 | 2016-04-28 | Bic-Violex Sa | A shaving blade cartridge and a shaver comprising such shaving blade cartridge |
EP3237156B1 (en) * | 2014-12-22 | 2020-04-22 | BIC-Violex S.A. | A shaving blade cartridge and a shaver comprising such shaving blade cartridge |
CN107107358B (en) * | 2014-12-24 | 2020-08-18 | 比克-维尔莱克 | Shaving blade cartridge and shaver comprising same |
EP3638467B1 (en) * | 2017-06-16 | 2024-02-28 | BIC Violex Single Member S.A. | Razor cartridges |
EP3912772B1 (en) * | 2020-05-20 | 2024-03-06 | BIC Violex Single Member S.A. | Razor head with improved spring fingers |
EP3912773B1 (en) | 2020-05-20 | 2024-03-06 | BIC Violex Single Member S.A. | Razor head with improved spring fingers |
EP4311637A1 (en) * | 2022-07-29 | 2024-01-31 | BIC Violex Single Member S.A. | Shaving head |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3019399A1 (en) * | 1979-05-25 | 1981-04-23 | The Gillette Co., 02199 Boston, Mass. | HEAD OF A SAFETY SHAVER |
JPS5627290A (en) * | 1979-05-25 | 1981-03-17 | Gillette Co | Head portion for safety razor |
US4774765A (en) * | 1986-09-02 | 1988-10-04 | Warner-Lambert Company | Blade assembly featuring variable span |
DE9108212U1 (en) * | 1991-07-03 | 1992-10-29 | Wilkinson Sword Gmbh | |
DE9108214U1 (en) * | 1991-07-03 | 1992-10-29 | Wilkinson Sword Gmbh, 5650 Solingen, De | |
US5222600A (en) * | 1992-07-28 | 1993-06-29 | Stoddard James T | Autoclave pouch |
-
1996
- 1996-08-05 GB GBGB9616402.5A patent/GB9616402D0/en active Pending
-
1997
- 1997-07-28 DE DE69718184T patent/DE69718184T2/en not_active Expired - Lifetime
- 1997-07-28 AU AU40460/97A patent/AU738107B2/en not_active Ceased
- 1997-07-28 EP EP97938045A patent/EP0929382B1/en not_active Expired - Lifetime
- 1997-07-28 JP JP50799098A patent/JP4267071B2/en not_active Expired - Fee Related
- 1997-07-28 ES ES97938045T patent/ES2185982T3/en not_active Expired - Lifetime
- 1997-07-28 CN CNB971970696A patent/CN1142050C/en not_active Expired - Fee Related
- 1997-07-28 WO PCT/US1997/013099 patent/WO1998005478A1/en active IP Right Grant
- 1997-07-28 CA CA002261759A patent/CA2261759C/en not_active Expired - Fee Related
- 1997-07-28 BR BR9710805A patent/BR9710805A/en not_active IP Right Cessation
- 1997-07-28 RU RU99104520/12A patent/RU2214902C2/en not_active IP Right Cessation
- 1997-07-28 AT AT97938045T patent/ATE230331T1/en not_active IP Right Cessation
- 1997-07-30 AR ARP970103437A patent/AR008109A1/en unknown
- 1997-07-31 ID IDP972655A patent/ID19214A/en unknown
- 1997-07-31 MY MYPI97003501A patent/MY132495A/en unknown
- 1997-08-03 EG EG77097A patent/EG21083A/en active
- 1997-08-04 TW TW086111133A patent/TW382609B/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9805478A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2000515406A (en) | 2000-11-21 |
DE69718184T2 (en) | 2003-08-21 |
BR9710805A (en) | 1999-08-17 |
JP4267071B2 (en) | 2009-05-27 |
CN1142050C (en) | 2004-03-17 |
MY132495A (en) | 2007-10-31 |
DE69718184D1 (en) | 2003-02-06 |
AR008109A1 (en) | 1999-12-09 |
EP0929382B1 (en) | 2003-01-02 |
CA2261759C (en) | 2003-09-30 |
AU4046097A (en) | 1998-02-25 |
TW382609B (en) | 2000-02-21 |
ATE230331T1 (en) | 2003-01-15 |
ID19214A (en) | 1998-06-28 |
EG21083A (en) | 2000-10-31 |
ES2185982T3 (en) | 2003-05-01 |
GB9616402D0 (en) | 1996-09-25 |
CN1227520A (en) | 1999-09-01 |
WO1998005478A1 (en) | 1998-02-12 |
CA2261759A1 (en) | 1998-02-12 |
AU738107B2 (en) | 2001-09-06 |
RU2214902C2 (en) | 2003-10-27 |
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