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Publication numberUS3777396 A
Publication typeGrant
Publication dateDec 11, 1973
Filing dateJun 1, 1972
Priority dateJun 1, 1972
Publication numberUS 3777396 A, US 3777396A, US-A-3777396, US3777396 A, US3777396A
InventorsSimonetti S
Original AssigneeWarner Lambert Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cartridges having tandemly mounted cutting edges on two sides thereof
US 3777396 A
Abstract
The specific disclosure provides a bonded blade cartridge having two double edge blades separated by a spacer rigidly secured between a cap member and a blade seat member. Transverse center portions of the lower surfaces of the cap member and of the spacer are curved to a greater degree than respective corresponding transverse center portions of the upper surfaces of the spacer and of the blade seat member. The greater degree of curvature of the lower surface of the spacer ensures that the bottom blade cutting edges are in proper abutting engagement with upwardly extending blade stops on the blade seat member. The greater degree of curvature in the lower surface of the cap member ensures that the cutting edges of the top blade are in proper abutting engagement with upwardly extending blade stops formed on the spacer.
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Description  (OCR text may contain errors)

United States Patent 1 1 Simonetti Dec. 11, 1973 CARTRIDGES HAVING TANDEMLY MOUNTED CUTTING EDGES ON TWO SIDES THEREOF Sergio Simonetti, Westport, Conn.

Warner-Lambert Company, Morris Plains, NJ.

Filed: June 1, 1972 Appl. No.: 258,683

Inventor:

Assignee:

US. Cl 30/32, 30/47, 30/50, 30/85, 30/346.57

Int. Cl... B26b 21/00, B26b 21/20, B26b 21/52 Field of Search 30/32, 47, 50, 346.58, 30/75, 85, 346.57

References Cited UNITED STATES PATENTS Harrison Dorion Plesch 30/50 Hulversceidt 30/50 Des Jardins 30/50 X Primary Examiner-Othell M. Simpson Assistant Examiner-Gary L. Smith Attorney-James F. Powers et al.

[57] ABSTRACT The specific disclosure provides a bonded blade cartridge having two double edge blades separated by a spacer rigidly secured between a cap member and a blade seat member. Transverse center portions of the lower surfaces of the cap member and of the spacer are curved to a greater degree than respective corre sponding transverse center portions of the upper surfaces of the spacer and of the blade seat member. The greater degree of curvature of the lower surface of the spacer ensures that the bottom blade cutting edges are in proper abutting engagement with upwardly extending blade stops on the blade seat member. The greater degree of curvature in the lower surface of the cap member ensures that the cutting edges of the top blade are in proper abutting engagement with upwardly extending blade stops formed on the spacer.

11 Claims, 7 Drawing Figures PATENIEUUEE 1 1 I975 SHEET 10F 2 CARTRIDGES HAVING TANDEMLY MOUNTED CUTTING EDGES ON TWO SIDES THEREOF BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to safety razors of a type having at least two blades permanently bonded in a disposable cartridge. More particularly, the present invention relates to cartridge structure for tandemly aligning the cutting edges of a plurality of double edge blades. I

2. Description of the Prior Art Disposable cartridges are known in which at least one blade is permanently secured in or between molded plastic material shaped to leave a cutting edge or edges exposed and to form a guard surface in front of the cutting edge or edges. The cartridge is detachably secured to a handle and is discarded when the cutting edges are no longer useful.

US. Pat. No. 2,741,839 provides a safety razor in which equally dimensioned double edge blades are flexed to provide tandemly arranged cutting edges at opposite sides of the razor. The tandemly mounted blades of US. Pat. No. 2,741,839 are positioned upwardly and rearwardly with respect to guard bar surfaces by locating the blades on centrally located razor pins.

SUMMARY OF THE INVENTION An advantage of bonded blade cartridges is that it is possible to optimize the shaving angles defined by the relationship between the cutting edges and the guard bar surfaces to minimize the possibility of nicks and cuts and to maximize shaving efficiency.

In accordance with the present invention, there is provided a disposable razor blade cartridge comprising a plurality of double edge blades rigidly secured between an upper member and a blade seat member. A spacer is provided between opposing side surfaces of the blade. The blade seat member and the spacer have upwardly extending blade stop members at the outer four corners thereof. Each blade cutting edge is brought into abutting engagement with a respective set of blade stop members to provide a pre-determined orientation with respect to a guard bar surface. Lower curved surfaces of the upper member and of the spacer have transverse center portions which are curved to a greater extent than opposing transverse center portions of the upper surfaces of the spacer and of the blade seat member to provide transverse gaps in the cartridge. The transverse gaps ensure that the cutting edges of the blades are properly positioned in abutting engagement with the blade stops.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a specific embodiment of the present invention showing a disposable cartridge and a holder therefor;

FIG. 2 is an exploded perspective view of the disposable cartridge shown in FIG. 1;

FIG. 3 is a bottom plan view of a cartridge cap member;

FIG. 4 is a cross-sectional view of the cartridge shown in FIG. 1;

FIG. 5 is an exploded view of .a portion of FIG.

FIG. 6 is another cross-sectional view of a cartridge showing another embodiment of the present invention; and

FIG. 7 is an exploded view of a portion of FIG. 6.

DESCRIPTION OFSPECIFIC EMBODIMENTS FIG. 1 shows in an exploded view a cartridge 10 and a cartridge holder 12. The cartridge 10 has a pair of double edge blades 26, 30 bonded permanently between an upper member or cap 24 and a blade seat member 20. The blades 26, 30 are maintained in a separated state by a spacer 22. The spacer 22 has a plurality of teeth 28 protruding a slight distance in front of the cutting edges of the top blade 26.

The blade seat member 20 has a guard bar 32 postioned on opposite longitudinal ends thereof. The guard bars 32 are spaced from the body portion of the blade seat member 20 by a plurality of ribs 33 to provide flow channels 34 between the guard bars 32 and the blade seat member 20. The flow channels 34 provide a path for shaving residue from the cutting edges of the bottom blade 30 downwardly between the guard bars 32 and the blade seat member 20.

The holder 12 includes a handle 13 to which a frame member 14 is secured. A generally U-shaped channel member 16 and a spring member 17 are secured to the upper portion of the frame member 14. The upper part of the U-shaped channel member 16 has rearwardly and forwardly extending flange portions 15 for sliding engagement in a T-shaped channel 18 transversely formed in the bottom of the blade seat member 20.

With reference to FIG. 2, the cap member 24 has a longitudinally upwardly curved lower surface 68, and a plurality of transversely spaced posts 36 extending downwardly from the lower surface 68 (FIG. 3). The posts 36 extend through a slot 38 in the top blade 26, apertures 44 in the spacer 22, a slot 38' in the bottom blade 30 and apertures 54 in the blade seat member 20. As shown in FIG. 4, the bottom portions of the posts 36 are staked, for example, by ultrasonic, mechanical or heat energy, to deform the lower ends and thereby bond the components of the cartridge l0-together) Each of the blades 26, 30 has two transverse rows of perforations 40, 42; 40, 42' formed therethrough. Shaving residue generated between the cutting edges of the blades 26, 30 passes between the teeth 28 formed on the spacer and down through the apertures 56, 58 formed in the blade seat member 20.

Upwardly extending top blade stop members 46, 48, 50, 51 are provided on the outer four comers of the spacer 22 for abutting engagement with the cutting edges of the top blade 26. Similarly, the blade seat member 20 has upwardly extending bottom blade stop members 60, 62, 64, 66 at the outer four corners thereof for abutting engagement with the cutting edges of the bottom blade 30.

An upper surface 45 of the spacer 22 is longitudinally upwardly curved and has a pre-determined radius of curvature. The lower surface 68 of the cap member 24 has'a tansverse center portion 68' with a radius of curvature less than the pre-determined radius of curvature of the spacer upper surface 45. Similarly, an upper surface 67 of the blade seat member 20 has a predetermined radius of curvature, and a lower surface 53 of the spacer has a transverse center portion 53, which portion has a radius of curvature less than that of the blade seat upper surface 67. As shown in FIG. 4, the

smaller radius of curvature in the transverse center portions 68', 53 provides transverse gaps 70, 72 between the cap member 24 and the top blade 26 and between the spacer 22 and the bottom blade 30.

The transverse gaps 70, 72 compensate for manufacturing tolerances in the formation of the components of the cartridge which may be in the order of 0.002 0.003 inch. The compensation is accomplished by absorbing the tolerances in the gaps 70, 72 after the blade edges are in an abutting engagement with respective pairs of stops 48, 50; 46, 51; 62, 64; 60, 66 on the spacer 22 and the blade seat member 20. In this manner, the relationship between the cutting edges and the guard bar 32 on each side of the cartridge 10 is predetermined by the relative positions of the blade stops on the spacer 22 and the blade seat member 20.

In the embodiments shown, the length and width dimensions of the blades 26, 30 are identical. The FIG. 4 embodiment provides for the radius of curvature of the spacer upper surface 45 to be less than the radius of curvature of the blade seat upper surface 67. This differnence in radii of curvature narrows the assembled distance between the cutting edges of the top blade 26 to less than the distance between the cutting edges of the bottom blade 30 such that the blades are tandemly mounted in the cartridge 10. As clearly shown in FIG. 5, this configuration situates the cutting edges of the top blade 26 to a cutting angle with respect to the guard bar 32 which is less than the cutting angle of the edges of the bottom blade 30.

The embodiment of FIGS. 6 and 7 is a modification of the embodiment of FIGS. 4 and 5 to equalize the cutting angles of the top and bottom blades. The components of the embodiment of FIGS. 6 and 7 which are identified by primed numerals indicate functional correspondence with components of the embodiment of FIGS. 4 and 5. However, the top blade 26 is reversed curved at 74 and 76 to orientate theouter ends of the top blade 26 parallelly with the outer ends of the bottom blade 30'.

The cap member 24, the spacer 22 and the blade seat member 20 can each be formed of molded plastic, or can be-composed of other, suitable materials such as metal.

It is also contemplated that the top blade 26 can have an unassembled cutting edge-to-cutting edge distance less than that of the bottom blade 30. In this embodiment, the radii of curvature of the upper surfaces of the spacer 22 and blade seat member 20 are equal to provide equivalent blade edge cutting angles with respect to the guard bars 32.

What is claimed is:

l. A disposable razor .blade cartridge comprising, in combination:

a blade seat member comprising a guard surface on each one of two opposite sides of said seat member, a pair of spaced first blade stop surfaces extending upwardly and rearwardly of opposite ends of each one of the guard surfaces, and an upwardly curved upper surface extending between each of the pairs of first blade stop surfaces,

a first double cutting edge blade located on said blade seat upper surface with each one of the cutting edges thereof abutting a respective one of the pairs of first blade stop surfaces, each one of the first blade cutting edges being spaced upwardly and rearwardly from a respective one of the guard surfaces,

a spacer located on said first blade, said spacer comprising a pair of spaced second blade stop surfaces extending upwardly and rearwardly of each one of the first blade cutting edges, an upwardly curved lower surface having the transverse outer portions thereof in abutting engagement with said first blade and a transverse center portion spaced upwardly from said first blade, and an upwardly curved upper surface extending between each of the pairs of second blade stop surfaces,

a second double cutting edge blade located on said spacer upper surface with each one of the cutting edges thereof abutting a respective one of the pairs of second blade stop surfaces, each one of the second blade cutting edges being spaced upwardly and rearwardly from a respective one of the first blade cutting edges,

an upper member comprising an upwardly curved lower surface having the transverse outer portions thereof in abutting engagement with said second blade and a transverse center portion spaced upwardly from said second blade, and

means for rigidly maintaining said first blade, said spacer and said second blade between said blade seat member and said upper member.

2. The cartridge of claim 1 further comprising means for releasably engaging a handle.

3. The cartridge of claim 1 wherein said first and second blades have identical length and width dimensions.

4. The cartridge of claim 1 wherein said maintaining means comprises a plurality of posts extending downwardly from said upper member, and wherein said second blade, said spacer, said first blade and said blade seat member have apertures for the passage of said posts therethrough, said posts being deformed at the lower ends thereof to prevent removal from said apertures.

5. The cartridge of claim 3 wherein said upper surface of said spacer and said lower surface of said upper member are curved toa greater degree than said upper surface of said blade seat and said lower surface of said spacer to decrease the distance between the cutting edges of said second blade to less than the distance between the cutting edges of said first blade.

6. The cartridge of claim 5 wherein said first blade has a pre-determined cutting angle, and wherein the outer ends of said upper surface of said spacer and said lower surface of said upper member are reversed curved to provide a second blade cutting angle corresponding to said pre-determined cutting angle.

7. The cartridge of claim 1 wherein said upper surface of said blade seat member has a first predetermined radius of curvature along at least a transverse center portion thereof, and-said transverse center portion of said spacer lower surface has a radius of curvature less than said first pre-determined radius of curvature, and wherin said upper surface of said spacer has a second pre-determined radius of curvature along at least a transverse center portion thereof, and said transverse center portion of said lower surface of said upper member has a radius of curvature less than said second pre-determined radius of curvature.

8. The cartridge of claim 7 wherein said first predetermined radius of curvature is greater than said second pre-determined radius of curvature.

9. The cartridge of claim 7 wherin the length of said second blade between the cutting edges thereof is less than the length of said first blade between the cutting edges thereof.

10. The cartridge of claim 9 wherin said first predetermined radius'of curvature is equal to said second predetermined radius of curvature.

11. A disposable razor blade cartridge comprising, in combination:

a blade seat member comprising a guard surface on each one of two opposite sides of said seat member, a pair of spaced first blade stop surfaces extending upwardly and rearwardly of opposite ends of each one of the guard surfaces, and an upwardly curved upper surface extending between each of the pairs of first blade stop surfaces,

a first double cutting edge blade located on said blade seat upper surface with each one of the cutting edges thereof abutting a respective one of the pairs of first blade stop surfaces, each one of the first blade cutting edges being spaced upwardly and rearwardly from a respective one of the guard surfaces,

a spacer located on said first blade, said spacer comprising a pair of spaced second blade stop surfaces extending upwardly and rearwardly of each one of the first blade cutting edges, an upwardly curved lower surface having the transverse outer portions thereof in abutting engagement with said first blade and a transverse center portion spaced upwardly from said first blade, and an upwardly curved upper surface extending between each of the pairs of second blade stop surfaces,

a second double cutting edge blade located on said spacer upper surface with each one of the cutting edges thereof abutting a respective one of the pairs of second blade stop surfaces, each one of the second blade cutting edges being spaced upwardly and rearwardly from a respective one of the first blade cutting edges,

an upper member comprising an upwardly curved lower surface having the transverse outer portions thereof in abutting engagement with said second blade and a transverse center portion spaced upwardly from said second blade, and

means interconnecting said blade seat member and said upper member for rigidly maintaining said first blade, said spacer and said second blade between said blade seat member and said upper member,

said upper surface of said blade seat member having a first pre-determined radius of curvature along at least a transverse center portion thereof, and said transverse center portion of said spacer lower surface having a radius of curvature less than said first predetermined radius of curvature, and

said upper surface of said spacer having a second predetermined radius of curvature along at least a transverse center portion thereof, and said transverse center portion of said lower surface of said upper member having a radius of curvature less than said second pre-determined radius of curvature.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1024509 *Nov 13, 1909Apr 30, 1912Herbert C HarrisonMultibladed razor.
US2319980 *Sep 25, 1939May 25, 1943Des Jardins Edmund LSafety razor
US2713201 *Aug 30, 1952Jul 19, 1955Peter Hariolf PleschSafety razors
US2741839 *Jul 5, 1952Apr 17, 1956Hellmuth HulverscheidtSafety razors
US3724070 *Mar 15, 1971Apr 3, 1973Gillette CoDual razor blade assembly
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3854201 *May 21, 1973Dec 17, 1974Warner Lambert CoSystem for dispensing razor blade cartridges
US3934338 *Dec 11, 1972Jan 27, 1976Philip Morris IncorporatedMultiple blade safety razor combination
US3935639 *Feb 25, 1974Feb 3, 1976The Gillette CompanySafety razor
US4069580 *Aug 18, 1976Jan 24, 1978Warner-Lambert CompanySafety razor with flexible blade cartridge
US4189832 *Jun 19, 1978Feb 26, 1980The Gillette CompanyShaving implement
US4245388 *Dec 19, 1977Jan 20, 1981Jan DawidowiczSafety razor
US4473944 *Dec 16, 1981Oct 2, 1984Carroll Patrick MSqueegee for razor
US4901437 *May 25, 1984Feb 20, 1990American Safety Razor CompanyRazor head and method of manufacture
US4977670 *Dec 18, 1989Dec 18, 1990American Safety Razor CompanyShaving implement
US5133131 *Aug 5, 1991Jul 28, 1992Hoffman Ralph HReplaceable double-sided razor blade unit
US5333382 *Jul 20, 1992Aug 2, 1994Ligaya CorporationBrow shaver
US5522137 *Sep 6, 1994Jun 4, 1996Andrews; Edward A.Bi-directional razor structures and systems
US5575068 *Apr 23, 1993Nov 19, 1996Warner-Lambert CompanySafety razor
US5865189 *May 24, 1996Feb 2, 1999Andrews; Edward A.Bi-directional shaving method
US5933959 *Feb 14, 1997Aug 10, 1999Sferruzza, Jr.; Gerald A.Shaving device
US6082007 *Jun 6, 1999Jul 4, 2000Andrews; Edward A.In-line bi-directional manual shaving razors
US6141875 *Oct 28, 1999Nov 7, 2000Andrews; Edward A.In-line shaving razors with twin pivoting heads
US6212777 *Sep 22, 1994Apr 10, 2001The Gillette CompanySafety razors
US6216349Jun 30, 1998Apr 17, 2001The Gillette CompanySafety razors
US6295734Mar 21, 1996Oct 2, 2001The Gillette CompanySafety razors
US6434828Nov 6, 2000Aug 20, 2002Edward A. AndrewsIn-line razor device with twin pivoting heads
US7100284Dec 11, 2003Sep 5, 2006Knowledge & Merchandising, Inc. Ltd.Shaving product
US7448135Mar 29, 2006Nov 11, 2008The Gillette CompanyMulti-blade razors
US7669511Aug 4, 2006Mar 2, 2010Knowledge & Merchandising, Inc. LimitedShaving product
US7882640Feb 8, 2011The Gillette CompanyRazor blades and razors
US8499459 *Aug 25, 2006Aug 6, 2013Bic-Violex SaShaving blade unit and shaver having such a blade unit
US8991058 *Jul 8, 2013Mar 31, 2015Bic ViolexShaving blade unit and shaver having such a blade unit
US9027443Nov 22, 2010May 12, 2015The Gillette CompanyMethod of making a razor
US9032627 *Jul 8, 2013May 19, 2015Bic-Violex SaShaving blade unit and shaver having such a blade unit
US9248579Jul 16, 2008Feb 2, 2016The Gillette CompanyRazors and razor cartridges
US20040200074 *Apr 27, 2004Oct 14, 2004The Gillette Company, A Delaware CorporationSafety razors
US20050102847 *Dec 11, 2003May 19, 2005King William A.Shaving product
US20050198837 *Mar 11, 2004Sep 15, 2005Stephen RawleShaving razors with multiple blades
US20060026842 *Aug 29, 2005Feb 9, 2006Bernard GilderSafety razors
US20060277760 *Jun 14, 2005Dec 14, 2006Sangyong LeeRazor blades and assemblies therefor
US20070028449 *Aug 4, 2006Feb 8, 2007King William AShaving product
US20070227009 *Mar 29, 2006Oct 4, 2007Andrew ZhukRazor blades and razors
US20070227010 *Mar 29, 2006Oct 4, 2007Andrew ZhukMulti-blade razors and blades for same
US20100011584 *Aug 25, 2006Jan 21, 2010Bic-Violex SaShaving blade unit and shaver having such a blade unit
US20100011590 *Jul 16, 2008Jan 21, 2010Depuydt Joseph AllanRazors and razor cartridges
US20100107425 *May 4, 2009May 6, 2010Eveready Battery Company Inc.Razor Blade and Method of Manufacture
US20110120973 *May 26, 2011Andrew ZhukRazor blades and razors
US20140059861 *Jul 8, 2013Mar 6, 2014Bic-Violex SaShaving blade unit and shaver having such a blade unit
US20140059862 *Jul 8, 2013Mar 6, 2014Bic-Violex SaShaving blade unit and shaver having such a blade unit
USRE30913 *Jan 17, 1980Apr 27, 1982Warner-Lambert CompanySafety razor with flexible blade cartridge
EP1232045A2 *Nov 8, 1999Aug 21, 2002Edward A. AndrewsBody shaving devices with curved razor blade strips
EP2559526A1 *Sep 29, 2009Feb 20, 2013The Gillette CompanyRazor cartridges with perforated blade assemblies
WO1994026476A1 *May 11, 1994Nov 24, 1994Invention Machine CorporationRazor blade unit
WO1995032081A2 *May 18, 1995Nov 30, 1995Edo Juan Antonio LiesaDouble-use razor
WO1995032081A3 *May 18, 1995Feb 15, 1996Edo Juan Antonio LiesaDouble-use razor
WO2010037078A1 *Sep 29, 2009Apr 1, 2010The Gillette CompanyRazor cartridges with perforated blade assemblies
WO2011071350A2 *Dec 13, 2010Jun 16, 2011Won-Sang ChoDual blade razor that is easily cleaned and simply assembled
WO2011071350A3 *Dec 13, 2010Nov 24, 2011Won-Sang ChoDual blade razor that is easily cleaned and simply assembled
WO2012033362A2 *Sep 8, 2011Mar 15, 2012Won-Sang ChoDual-headed razor for rough shaving and finishing shaving
WO2012033362A3 *Sep 8, 2011Jun 28, 2012Won-Sang ChoDual-headed razor for rough shaving and finishing shaving
Classifications
U.S. Classification30/47, 30/50, 30/346.57
International ClassificationB26B21/22, B26B21/08
Cooperative ClassificationB26B21/22
European ClassificationB26B21/22