CA2162685A1 - Razor blade unit - Google Patents
Razor blade unitInfo
- Publication number
- CA2162685A1 CA2162685A1 CA 2162685 CA2162685A CA2162685A1 CA 2162685 A1 CA2162685 A1 CA 2162685A1 CA 2162685 CA2162685 CA 2162685 CA 2162685 A CA2162685 A CA 2162685A CA 2162685 A1 CA2162685 A1 CA 2162685A1
- Authority
- CA
- Canada
- Prior art keywords
- cutting
- blade
- hair
- cutting edge
- angle
- 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.)
- Abandoned
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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dry Shavers And Clippers (AREA)
- Scissors And Nippers (AREA)
Abstract
A wet shaving head in-cludes parts (6, 7) that de-fine a cutting plane, a leading blade (2) mounted at an an-gle that is optimum for lift-ing before substantially cut-ting through the hair, and a trailing blade (3) mounted at an angle that is optimum for cutting a lifted hair with-out substantially further lift-ing it. The blades (2, 3) are arranged so that the trailing blade (3) begins to cut the hair before the leading blade (2) completes its cutting action on the lifted hair. The trailing blade (3) has its cutting edge mounted close to the cutting plane and the leading blade (2) has its cutting edge mounted at the same or greater distance from the cutting plane.
Description
~ 94/26476 PCT/US94tO5238 RAZOR BLADE UNIT
This present invention relates to safety shaving a~p~dt~ls and more particularly to a repl~rP~ble razor blade cartridge with two blades.
There are widespread safety shaving app~dtus that consist of a handle co,l,ponent and a replaceable cartridge or head with two razor blades held therein. Such a replaceable head is manufactured by many firms and among there are "GILETTE TRAC II" (GILETTE
COMPANY), "SCHICK ULTREX" (SCHICK), "F II" (Feather, Japan), "SPUTNIK II"
(Consumer Goods Factory, St. Petersburg, Russia). In general, the design of the above-mentioned units is çssenti~lly defined by GILETTE patent, Great Britain, No. 1,362,443, a simplified design structure of which prior art razor blade unit is shown in FIG. 1.
The prior art shaving unit includes a base 1, a leading blade 2 and a following blade 3 with a space 4 between them and a cap mPmbPr 5. Base 1 and cap member 5 have two ~.lppo,ling surfaces 6 and 7 COl~ ondingly for contact with skin, and the cutting edges of the blades are disposed between these mPntionP~ surfaces. The shaving unit razor blades 2 ?,,,.6~G~
and 3 are disposed in parallel relation to one another and define an angle of about 20 to 25 degrees with the cutting plate or cutting plane between edges of sul po~ling surfaces 6 and 7.
The safety of shaving is provided by presence of the s.~ ing surfaces and the spe~ific positioning of razor blades in the gap belween the base and cap members.
Well-known modifi~tions have been made to the shaving razor blade units shown in said British patent. For in~t~nce, to improve the cle~ning in the gap between blades, a spring plate is placed in this gap to force out lather and debris, som~timtos referred to as a "cle~ning system" in well-known TRAC II, SCHICK, F II shaving razor blade units. To simplify the assembling p~lu~e, shaving units can be made from two plastic parts with p~ ss~d razor blades, or using standard razor blades. See, for example, U.S. Patent No.
4,852,254 and Former U.S.S.R. Certificate 1,481,061.
The integral coupling groove structure and the processes of assembly, m~tçri~l~ and metho~s of ma~ ining are well developed, but no change has been made to the principal constructional scheme or principle of operation of the shaving unit that is shown in FIG. 1 which reflects the prior art to the present invention.
It is a main goal or theory of the prior art unit of Figure 1 to provide a close shave pu,suant to the intende~ method shown in Figure 2. In Figure 2, the leading razor blade 2, while cutting, lifts the hair, completes the cut, leaving some part of the uncut hair above the cutting plate. At the next moment, this uncut hair portion is engaged and cut by the O 94/26476 21 6 2 6 ~ ~ PCT/US94/05238 following ra_or blade 3 (FIG. 2-B). After shaving, skin el~ticity causes the cut hair to be pulled down, and as a result, the surface of skin is shaved closely.
But this in~ended method of Figure 2, in reality, is pe,rol"~ed rather poorly because of the hair's downward movement before the following razor blade 3 can cut it, i.e., there is no cutting of the raised hair close to the skin surface. The enh~nc~rnent of this action by re~ucing gap between blades will not lead to re~li7~tiQn of the intended method because the space between blades fills quickly with lather and debris.
- Also, real shaving quality improvement does not result from increasing of number of razor blades as shown in Euro~ Patent No. 0336355.
Moreover, the design of Figure 1 does not supply the optimum geometrical relationship between various co",ponents of the system that relates to shaving comfort because the ra7or blade mounting for effective pushing or pulling the hair upward, i.e., 25 degrees, is not effective for cutting the hair. Applicants hereof have dele.,l,ined that cutting is better achieved by razor blades mounting at the half of 20 to 25 degree cutting edge angle, i.e., about 11 degrees to the cutting plate for existing prior art razor blades.
To some extent, the angle of cutting can be changed by moving the shaving unit (swivel head). See Eu~upean Patent No. 0132663. But in this prior art case, the quality of shaving remains the same as that of usual two blade shaving unit because the method of pulling or pushing up and cutting the hair remains the same as in Figure 2.
The çngint-Pring objective of the present invention is to develop a two-razor-blade shaving unit that provides a close and safe shave.
WO 94/26476 ~ GC~6 PCT/US94/0523~
The objective result is achieved, in one eyempl~ry embodiment of the present invention, by providing a shaving unit similar to that of Figure 1 comprising a base and a cap mPmher, having sul)po~ g surfaces for contact with the skin and two razor blades bel~n said base and said cap ...- ..b~. However, according to the present invention, said razor blades are mounted in such a manner so as to create by their plates or planes, at the zone of the cutting edges, an acute angle, and the leading razor blade is positioned toward the cutting plate not closer than the trailing blade.
The shaving prin-ipl~P of the present invention is that both razor blades, when mounted as stated above, act on the hair at the same time. The leading razor blade pushes or pulls up the hair and cuts it but not all the way through when the following razor blade begins to cut the hair completely close to the skin surface.
With this process, the razor blade ..ou~.ling ~,~ge."ent provides both the optimum angle for pulling up the hair by the leading razor blade and the optimum cutting angle for the following blade, thus providing both a close and a safe shave.
It should be understood that mounting razor blades according to the present invention enables them to be very close together to supply, on the one hand, the best conditions for simul~neQusly acting on the same cut hair, and out of danger, on the other hand, that the lather and debris will fill up the space between razor blades because such lather and debris will move to the e~cp~n(ling space between the blades.
The present invention prin~iple can be seen by drawings in which:
FIG. 1 - prior art sc-hPm~tic construction.
'O 94/26476 ~8~ PCT/US94/05238 FIG. 2 - int~nded scheme of hair-cutting process by prior art shaving unit.
FIG. 3 - scheme of the shaving process of one embodiment of the present invention.
FIG. 4 - one embodiment example of the present invention comprising one-sided razor blade shaving unit construction.
FIG. S and FIG. 6 - variants of present invention emboAim~ont~ of double-sided razor blade shaving unit construction.
The shaving razor blade unit (FIG. 4) according to the principles of the present invention compri~s base 1 and two razor blades - leading blade 2 and following blade 3, cap mPmb.or 5 . Base 1 and cap member 5 have ~lppOI ling surfaces 6 and 7 correcpon~ling to the tangent plate or cutting plate. The razor blades 2 and 3 are mounted at the acute angle one to another so the angle between leading razor blade plate or plane and the cutting plate is about 20 - 25 degrees, and the one belween following razor blade plate or plane and the cutting plate is about 10 - 12 degrees. For supplying of the best conditions of above mentioned simultaneous activities on the pulled up and cut hair by both razor blades 2 and 3, the leading edge of razor blade 2 is positioned a ~ t~nce from the cutting plane no less than the leading edge of blade 3.
The modified double-sided shaving unit (FIG. S) according to the present invention comprises a base 1, two pairs of razor blades 2 and 3, cap mto-mber 5. Like a one-sided shaving unit (FIG. 4), in this variant, base 1 and cap mPmber S have supporting surfaces 6 and 7 that create two cutting plates. Co"~l,ondingly, the razor blades 2 and 3 are mounted to create the cutting pairs like those of FIG. 4.
WO 94/26476 ?~,~ 67'6S PCT/US94/0523g Shaving units in FIG. SA and FIG. SB show ~ltPrn~tive embodimPnt~ of the inventive units of the double sided type. In FIG. SA, the following razor blades 3 are mounted in the same plane but the leading razor blades 2 are mounted in two planes at an angle one to the other. In FIG. SB, the leading razor blades 2 are mounted in one plane but the following razor blades 3 are mounted in two planes with an angle one to another.
It is possible to create double-sided shaving unit (FIG. 6) embodying the invention with two pairs of cutting razor blade edges 2 and 3 from only two strips of m~tPri~l for all leading razor blades 2 and for all following ones 3. In this case, double-edged blades are pressed or stressed into the shaving head so their planes, in the zone or area at cutting edges, create an angle mentioned above for the present invention in relation to cutting plate.
The assembling process of shaving heads according to the present invention can be the usual m~nllf~tllring of the standard shaving unit of Figure 1. The elen-.onts of the integral coupling groove structure of the head for cooperating with the handle can be the same as the known prior art products, for in~t~ntce~ fixed or pivoting type.
The technique or motion of wet shaving with the shaving unit of the present invention is the same as that of the prior art.
- However, shaving with a unit according to principles of the present invention, including the simultaneous action on the cut hair by both razor blades as shown in FIG. 3, a close, safe and better shave is achieved.
IO 94126476 6~?68~ PCT/US94/05238 It will be understood that various modifications and changes can be made to the herein ~ rlose~ exemplary emboAimPnt~ of the present invention without dep~ling from the spirit and sense thereof.
This present invention relates to safety shaving a~p~dt~ls and more particularly to a repl~rP~ble razor blade cartridge with two blades.
There are widespread safety shaving app~dtus that consist of a handle co,l,ponent and a replaceable cartridge or head with two razor blades held therein. Such a replaceable head is manufactured by many firms and among there are "GILETTE TRAC II" (GILETTE
COMPANY), "SCHICK ULTREX" (SCHICK), "F II" (Feather, Japan), "SPUTNIK II"
(Consumer Goods Factory, St. Petersburg, Russia). In general, the design of the above-mentioned units is çssenti~lly defined by GILETTE patent, Great Britain, No. 1,362,443, a simplified design structure of which prior art razor blade unit is shown in FIG. 1.
The prior art shaving unit includes a base 1, a leading blade 2 and a following blade 3 with a space 4 between them and a cap mPmbPr 5. Base 1 and cap member 5 have two ~.lppo,ling surfaces 6 and 7 COl~ ondingly for contact with skin, and the cutting edges of the blades are disposed between these mPntionP~ surfaces. The shaving unit razor blades 2 ?,,,.6~G~
and 3 are disposed in parallel relation to one another and define an angle of about 20 to 25 degrees with the cutting plate or cutting plane between edges of sul po~ling surfaces 6 and 7.
The safety of shaving is provided by presence of the s.~ ing surfaces and the spe~ific positioning of razor blades in the gap belween the base and cap members.
Well-known modifi~tions have been made to the shaving razor blade units shown in said British patent. For in~t~nce, to improve the cle~ning in the gap between blades, a spring plate is placed in this gap to force out lather and debris, som~timtos referred to as a "cle~ning system" in well-known TRAC II, SCHICK, F II shaving razor blade units. To simplify the assembling p~lu~e, shaving units can be made from two plastic parts with p~ ss~d razor blades, or using standard razor blades. See, for example, U.S. Patent No.
4,852,254 and Former U.S.S.R. Certificate 1,481,061.
The integral coupling groove structure and the processes of assembly, m~tçri~l~ and metho~s of ma~ ining are well developed, but no change has been made to the principal constructional scheme or principle of operation of the shaving unit that is shown in FIG. 1 which reflects the prior art to the present invention.
It is a main goal or theory of the prior art unit of Figure 1 to provide a close shave pu,suant to the intende~ method shown in Figure 2. In Figure 2, the leading razor blade 2, while cutting, lifts the hair, completes the cut, leaving some part of the uncut hair above the cutting plate. At the next moment, this uncut hair portion is engaged and cut by the O 94/26476 21 6 2 6 ~ ~ PCT/US94/05238 following ra_or blade 3 (FIG. 2-B). After shaving, skin el~ticity causes the cut hair to be pulled down, and as a result, the surface of skin is shaved closely.
But this in~ended method of Figure 2, in reality, is pe,rol"~ed rather poorly because of the hair's downward movement before the following razor blade 3 can cut it, i.e., there is no cutting of the raised hair close to the skin surface. The enh~nc~rnent of this action by re~ucing gap between blades will not lead to re~li7~tiQn of the intended method because the space between blades fills quickly with lather and debris.
- Also, real shaving quality improvement does not result from increasing of number of razor blades as shown in Euro~ Patent No. 0336355.
Moreover, the design of Figure 1 does not supply the optimum geometrical relationship between various co",ponents of the system that relates to shaving comfort because the ra7or blade mounting for effective pushing or pulling the hair upward, i.e., 25 degrees, is not effective for cutting the hair. Applicants hereof have dele.,l,ined that cutting is better achieved by razor blades mounting at the half of 20 to 25 degree cutting edge angle, i.e., about 11 degrees to the cutting plate for existing prior art razor blades.
To some extent, the angle of cutting can be changed by moving the shaving unit (swivel head). See Eu~upean Patent No. 0132663. But in this prior art case, the quality of shaving remains the same as that of usual two blade shaving unit because the method of pulling or pushing up and cutting the hair remains the same as in Figure 2.
The çngint-Pring objective of the present invention is to develop a two-razor-blade shaving unit that provides a close and safe shave.
WO 94/26476 ~ GC~6 PCT/US94/0523~
The objective result is achieved, in one eyempl~ry embodiment of the present invention, by providing a shaving unit similar to that of Figure 1 comprising a base and a cap mPmher, having sul)po~ g surfaces for contact with the skin and two razor blades bel~n said base and said cap ...- ..b~. However, according to the present invention, said razor blades are mounted in such a manner so as to create by their plates or planes, at the zone of the cutting edges, an acute angle, and the leading razor blade is positioned toward the cutting plate not closer than the trailing blade.
The shaving prin-ipl~P of the present invention is that both razor blades, when mounted as stated above, act on the hair at the same time. The leading razor blade pushes or pulls up the hair and cuts it but not all the way through when the following razor blade begins to cut the hair completely close to the skin surface.
With this process, the razor blade ..ou~.ling ~,~ge."ent provides both the optimum angle for pulling up the hair by the leading razor blade and the optimum cutting angle for the following blade, thus providing both a close and a safe shave.
It should be understood that mounting razor blades according to the present invention enables them to be very close together to supply, on the one hand, the best conditions for simul~neQusly acting on the same cut hair, and out of danger, on the other hand, that the lather and debris will fill up the space between razor blades because such lather and debris will move to the e~cp~n(ling space between the blades.
The present invention prin~iple can be seen by drawings in which:
FIG. 1 - prior art sc-hPm~tic construction.
'O 94/26476 ~8~ PCT/US94/05238 FIG. 2 - int~nded scheme of hair-cutting process by prior art shaving unit.
FIG. 3 - scheme of the shaving process of one embodiment of the present invention.
FIG. 4 - one embodiment example of the present invention comprising one-sided razor blade shaving unit construction.
FIG. S and FIG. 6 - variants of present invention emboAim~ont~ of double-sided razor blade shaving unit construction.
The shaving razor blade unit (FIG. 4) according to the principles of the present invention compri~s base 1 and two razor blades - leading blade 2 and following blade 3, cap mPmb.or 5 . Base 1 and cap member 5 have ~lppOI ling surfaces 6 and 7 correcpon~ling to the tangent plate or cutting plate. The razor blades 2 and 3 are mounted at the acute angle one to another so the angle between leading razor blade plate or plane and the cutting plate is about 20 - 25 degrees, and the one belween following razor blade plate or plane and the cutting plate is about 10 - 12 degrees. For supplying of the best conditions of above mentioned simultaneous activities on the pulled up and cut hair by both razor blades 2 and 3, the leading edge of razor blade 2 is positioned a ~ t~nce from the cutting plane no less than the leading edge of blade 3.
The modified double-sided shaving unit (FIG. S) according to the present invention comprises a base 1, two pairs of razor blades 2 and 3, cap mto-mber 5. Like a one-sided shaving unit (FIG. 4), in this variant, base 1 and cap mPmber S have supporting surfaces 6 and 7 that create two cutting plates. Co"~l,ondingly, the razor blades 2 and 3 are mounted to create the cutting pairs like those of FIG. 4.
WO 94/26476 ?~,~ 67'6S PCT/US94/0523g Shaving units in FIG. SA and FIG. SB show ~ltPrn~tive embodimPnt~ of the inventive units of the double sided type. In FIG. SA, the following razor blades 3 are mounted in the same plane but the leading razor blades 2 are mounted in two planes at an angle one to the other. In FIG. SB, the leading razor blades 2 are mounted in one plane but the following razor blades 3 are mounted in two planes with an angle one to another.
It is possible to create double-sided shaving unit (FIG. 6) embodying the invention with two pairs of cutting razor blade edges 2 and 3 from only two strips of m~tPri~l for all leading razor blades 2 and for all following ones 3. In this case, double-edged blades are pressed or stressed into the shaving head so their planes, in the zone or area at cutting edges, create an angle mentioned above for the present invention in relation to cutting plate.
The assembling process of shaving heads according to the present invention can be the usual m~nllf~tllring of the standard shaving unit of Figure 1. The elen-.onts of the integral coupling groove structure of the head for cooperating with the handle can be the same as the known prior art products, for in~t~ntce~ fixed or pivoting type.
The technique or motion of wet shaving with the shaving unit of the present invention is the same as that of the prior art.
- However, shaving with a unit according to principles of the present invention, including the simultaneous action on the cut hair by both razor blades as shown in FIG. 3, a close, safe and better shave is achieved.
IO 94126476 6~?68~ PCT/US94/05238 It will be understood that various modifications and changes can be made to the herein ~ rlose~ exemplary emboAimPnt~ of the present invention without dep~ling from the spirit and sense thereof.
Claims (11)
- Claim 1. A shaving head comprising a part for engaging a user's skin and forming a cutting plane therewith, a leading blade and a following blade both mounted rearward of said part, each of said blades having a cutting edge spaced from the other cutting edge and facing toward the forward direction and toward said cutting plane, said cutting edges moving generally parallel to the cutting plane when said part is moved forward, said leading blade cutting edge forming a first acute angle with said cutting plane, said following blade cutting edge forming a second acute angle with said cutting plane, said first angle being greater than said second angle, the leading blade cutting edge being spaced from said cutting plane a distance that is equal to or greater than the distance between the following blade cutting edge and the cutting plane, and the spacing between said cutting edges enabling said cutting edges to simultaneously act on a hair during a same time segment during their forward movement.
- Claim 2. A head according to claim 1, wherein the leading blade cutting edge is spaced forward of the following blade cutting edge a distance which enables the leading cutting edge to engage and raise a hair by its forward movement and no more than partially cut into the raised hair at the moment the following blade engages and begins to cut the raised hair.
- Claim 3. A head according to claim 1, wherein the following blade cutting edge is located relative to said cutting plane so that one of the surfaces of said following blade contacts the skin surface during forward travel.
- Claim 4. A head according to claim 3, wherein the distance between said cutting plane and the cutting edge of said leading blade is greater than the distance between the following blade cutting edge and said cutting plane.
- Claim 5. A head according to claim 1 , wherein said first angle is selected to substantially optimize the raising of a hair before cutting the same.
- Claim 6. A head according to claim 1 wherein said second angle is selected to substantially optimize the cutting through of a raised hair without substantially raising the same.
- Claim 7. A head according to claim 1 , wherein said second angle approximates one-half the value of the first angle.
- Claim 8. A head according to claim 7, wherein said first angle approximates 20-25 degrees, and said second angle approximates 10-12 degrees.
- Claim 9. A shaving head comprising a part for engaging a user's skin and forming a cutting plane therewith, a leading member mounted in the head rearward of said part and moving forward and generally parallel to said cutting plane when said part is moved forward, said member having a leading edge for raising a hair by engaging a portion of the hair located above the cutting plane and moving said portion generally parallel and forward as said member moves forward, and a following blade mounted in the head and having a cutting edge for cutting through the raised hair substantially at the cutting plane, said cutting edge beginning the cutting of the raised hair while said leading edge is applying raising forces on the hair.
- Claim 10. A head according to claim 9, wherein said cutting edge forms an angle with said cutting plane such that said blade cuts the raised hair without substantially raising the same further.
- Claim 11. A head according to claim 9, wherein said cutting blade is mounted on the head such that its cutting edge travels substantially along said cutting plane.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU93027402 | 1993-05-13 | ||
| RU93027402/12A RU93027402A (en) | 1993-05-13 | SHAVED CASSETTE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2162685A1 true CA2162685A1 (en) | 1994-11-24 |
Family
ID=20141875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2162685 Abandoned CA2162685A1 (en) | 1993-05-13 | 1994-05-11 | Razor blade unit |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU7093494A (en) |
| CA (1) | CA2162685A1 (en) |
| WO (1) | WO1994026476A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050022386A1 (en) | 2003-07-29 | 2005-02-03 | Macove James A. | Razor having separate blade groups for shaving and trimming/sculpting |
| US7882640B2 (en) | 2006-03-29 | 2011-02-08 | The Gillette Company | Razor blades and razors |
| US7448135B2 (en) | 2006-03-29 | 2008-11-11 | The Gillette Company | Multi-blade razors |
| US9248579B2 (en) | 2008-07-16 | 2016-02-02 | The Gillette Company | Razors and razor cartridges |
| KR101111504B1 (en) * | 2011-12-30 | 2012-02-22 | 오상근 | Plate cutter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE853397C (en) * | 1950-10-08 | 1952-10-23 | Erich Fiebelkorn | razor |
| US3777396A (en) * | 1972-06-01 | 1973-12-11 | Warner Lambert Co | Cartridges having tandemly mounted cutting edges on two sides thereof |
| NL7506985A (en) * | 1975-06-12 | 1976-12-14 | Philips Nv | SHAVER WITH A CUTTING ELEMENT HOLDER. |
| US4407067A (en) * | 1980-10-06 | 1983-10-04 | The Gillette Company | Shaving implement |
-
1994
- 1994-05-11 WO PCT/US1994/005238 patent/WO1994026476A1/en active Application Filing
- 1994-05-11 AU AU70934/94A patent/AU7093494A/en not_active Abandoned
- 1994-05-11 CA CA 2162685 patent/CA2162685A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO1994026476A1 (en) | 1994-11-24 |
| AU7093494A (en) | 1994-12-12 |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |