US3777396A - Cartridges having tandemly mounted cutting edges on two sides thereof - Google Patents

Cartridges having tandemly mounted cutting edges on two sides thereof Download PDF

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Publication number
US3777396A
US3777396A US00258683A US3777396DA US3777396A US 3777396 A US3777396 A US 3777396A US 00258683 A US00258683 A US 00258683A US 3777396D A US3777396D A US 3777396DA US 3777396 A US3777396 A US 3777396A
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blade
spacer
cutting edges
curvature
upwardly
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US00258683A
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S Simonetti
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Warner Lambert Co LLC
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Warner Lambert Co LLC
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26BHAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00Razors 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
    • B26B21/08Razors 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
    • B26B21/14Safety razors with one or more blades arranged transversely to the handle
    • B26B21/22Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously

Definitions

  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 7 is an exploded view of a portion of FIG. 6.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • an upper surface 67 of the blade seat member 20 has a predetermined radius of curvature
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • top blade 26 can have an unassembled cutting edge-to-cutting edge distance less than that of the bottom blade 30.
  • 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.
  • 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,
  • 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
  • the cartridge of claim 1 further comprising means for releasably engaging a handle.
  • 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.
  • 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,
  • 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
  • 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.

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.

Description

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.

Claims (11)

1. 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 to a 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 pre-determined 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 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 having a radius of curvature less than said second pre-determined radius of curvature.
US00258683A 1972-06-01 1972-06-01 Cartridges having tandemly mounted cutting edges on two sides thereof Expired - Lifetime US3777396A (en)

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US3854201A (en) * 1971-10-22 1974-12-17 Warner Lambert Co System for dispensing razor blade cartridges
US3934338A (en) * 1972-12-11 1976-01-27 Philip Morris Incorporated Multiple blade safety razor combination
US3935639A (en) * 1973-03-01 1976-02-03 The Gillette Company Safety razor
US4069580A (en) * 1976-08-18 1978-01-24 Warner-Lambert Company Safety razor with flexible blade cartridge
US4189832A (en) * 1978-06-19 1980-02-26 The Gillette Company Shaving implement
US4245388A (en) * 1977-12-19 1981-01-20 Jan Dawidowicz Safety razor
USRE30913E (en) * 1980-01-17 1982-04-27 Warner-Lambert Company Safety razor with flexible blade cartridge
US4473944A (en) * 1981-12-16 1984-10-02 Carroll Patrick M Squeegee for razor
US4901437A (en) * 1984-05-25 1990-02-20 American Safety Razor Company Razor head and method of manufacture
US4977670A (en) * 1989-12-18 1990-12-18 American Safety Razor Company Shaving implement
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US20050198837A1 (en) * 2004-03-11 2005-09-15 Stephen Rawle Shaving razors with multiple blades
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US20070227009A1 (en) * 2006-03-29 2007-10-04 Andrew Zhuk Razor blades and razors
US20070227010A1 (en) * 2006-03-29 2007-10-04 Andrew Zhuk Multi-blade razors and blades for same
US20100011584A1 (en) * 2006-08-25 2010-01-21 Bic-Violex Sa Shaving blade unit and shaver having such a blade unit
US20100011590A1 (en) * 2008-07-16 2010-01-21 Depuydt Joseph Allan Razors and razor cartridges
WO2010037078A1 (en) * 2008-09-29 2010-04-01 The Gillette Company Razor cartridges with perforated blade assemblies
US20100107425A1 (en) * 2008-05-05 2010-05-06 Eveready Battery Company Inc. Razor Blade and Method of Manufacture
WO2011071350A2 (en) * 2009-12-11 2011-06-16 Cho Won-Sang Dual blade razor that is easily cleaned and simply assembled
KR101108807B1 (en) 2012-01-05 2012-02-20 조원상 The double sided head razor which is easy to clean
WO2012033362A2 (en) * 2010-09-08 2012-03-15 Cho Won-Sang Dual-headed razor for rough shaving and finishing shaving
US20160144519A1 (en) * 2014-11-21 2016-05-26 Leaf Shave Company Llc Razor with Pivoting Head
US20160167241A1 (en) * 2014-12-10 2016-06-16 Haggai Goldfarb Intelligent shaving system having sensors
US9505142B2 (en) 2014-09-12 2016-11-29 Rockwell Razors Corporation Modular safety razor with adjustable blade angle
USD774696S1 (en) * 2015-05-15 2016-12-20 Mongoose Razors, Inc. Shaving razor
US20170113363A1 (en) * 2015-10-23 2017-04-27 Juan Lopez Adjustable Shaving Device
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USD788367S1 (en) * 2015-09-11 2017-05-30 Rockwell Razors Corporation Safety razor base plate
US20170274541A1 (en) * 2016-03-25 2017-09-28 Avraham Gilor Safety razor
US20170326744A1 (en) * 2014-03-05 2017-11-16 Mack-Ray Inc. Dual sided razor
US9931755B2 (en) 2016-03-25 2018-04-03 Avraham Gilor Safety razor
US20180297220A1 (en) * 2017-04-18 2018-10-18 The Gillette Company Llc Shaving razor system
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US10807256B2 (en) 2014-09-12 2020-10-20 Rockwell Razors Corporation Modular safety razor with adjustable blade angle
US20210299898A1 (en) * 2020-03-31 2021-09-30 Jessica McDaniel Razor with natural head-handle angle
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US11628580B2 (en) * 2016-12-02 2023-04-18 Dorco Co., Ltd. Dual double-edge razor
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Publication number Priority date Publication date Assignee Title
US3854201A (en) * 1971-10-22 1974-12-17 Warner Lambert Co System for dispensing razor blade cartridges
US3934338A (en) * 1972-12-11 1976-01-27 Philip Morris Incorporated Multiple blade safety razor combination
US3935639A (en) * 1973-03-01 1976-02-03 The Gillette Company Safety razor
US4069580A (en) * 1976-08-18 1978-01-24 Warner-Lambert Company Safety razor with flexible blade cartridge
US4245388A (en) * 1977-12-19 1981-01-20 Jan Dawidowicz Safety razor
US4189832A (en) * 1978-06-19 1980-02-26 The Gillette Company Shaving implement
USRE30913E (en) * 1980-01-17 1982-04-27 Warner-Lambert Company Safety razor with flexible blade cartridge
US4473944A (en) * 1981-12-16 1984-10-02 Carroll Patrick M Squeegee for razor
US4901437A (en) * 1984-05-25 1990-02-20 American Safety Razor Company Razor head and method of manufacture
US4977670A (en) * 1989-12-18 1990-12-18 American Safety Razor Company Shaving implement
US5133131A (en) * 1991-08-05 1992-07-28 Hoffman Ralph H Replaceable double-sided razor blade unit
US5333382A (en) * 1992-03-02 1994-08-02 Ligaya Corporation Brow shaver
US5575068A (en) * 1992-04-27 1996-11-19 Warner-Lambert Company Safety razor
US6082007A (en) * 1993-02-22 2000-07-04 Andrews; Edward A. In-line bi-directional manual shaving razors
US6434828B1 (en) 1993-02-22 2002-08-20 Edward A. Andrews In-line razor device with twin pivoting heads
US5522137A (en) * 1993-02-22 1996-06-04 Andrews; Edward A. Bi-directional razor structures and systems
US5865189A (en) * 1993-02-22 1999-02-02 Andrews; Edward A. Bi-directional shaving method
US6141875A (en) * 1993-02-22 2000-11-07 Andrews; Edward A. In-line shaving razors with twin pivoting heads
WO1994026476A1 (en) * 1993-05-13 1994-11-24 Invention Machine Corporation Razor blade unit
US6212777B1 (en) * 1993-09-29 2001-04-10 The Gillette Company Safety razors
US20060026842A1 (en) * 1993-09-29 2006-02-09 Bernard Gilder Safety razors
US6216349B1 (en) 1993-09-29 2001-04-17 The Gillette Company Safety razors
US20040200074A1 (en) * 1993-09-29 2004-10-14 The Gillette Company, A Delaware Corporation Safety razors
WO1995032081A3 (en) * 1994-05-18 1996-02-15 Edo Juan Antonio Liesa Double-use razor
WO1995032081A2 (en) * 1994-05-18 1995-11-30 Juan Antonio Liesa Edo Double-use razor
US6295734B1 (en) 1995-03-23 2001-10-02 The Gillette Company Safety razors
EP1232045A2 (en) * 1996-10-29 2002-08-21 Edward A. Andrews Body shaving devices with curved razor blade strips
EP1232045A4 (en) * 1996-10-29 2003-01-22 Edward A Andrews Body shaving devices with curved razor blade strips
US5933959A (en) * 1997-02-14 1999-08-10 Sferruzza, Jr.; Gerald A. Shaving device
GB2408010A (en) * 2003-11-17 2005-05-18 Knowledge & Merchandising Inc A Safety Razor
US7669511B2 (en) 2003-11-17 2010-03-02 Knowledge & Merchandising, Inc. Limited Shaving product
US20050102847A1 (en) * 2003-11-17 2005-05-19 King William A. Shaving product
US7100284B2 (en) 2003-11-17 2006-09-05 Knowledge & Merchandising, Inc. Ltd. Shaving product
US20070028449A1 (en) * 2003-11-17 2007-02-08 King William A Shaving product
GB2408010B (en) * 2003-11-17 2007-03-28 Knowledge & Merchandising Inc Shaving product
US20050198837A1 (en) * 2004-03-11 2005-09-15 Stephen Rawle Shaving razors with multiple blades
US20060277760A1 (en) * 2005-06-14 2006-12-14 Sangyong Lee Razor blades and assemblies therefor
US20110120973A1 (en) * 2006-03-29 2011-05-26 Andrew Zhuk Razor blades and razors
US7448135B2 (en) 2006-03-29 2008-11-11 The Gillette Company Multi-blade razors
US20070227010A1 (en) * 2006-03-29 2007-10-04 Andrew Zhuk Multi-blade razors and blades for same
US7882640B2 (en) 2006-03-29 2011-02-08 The Gillette Company Razor blades and razors
US9027443B2 (en) 2006-03-29 2015-05-12 The Gillette Company Method of making a razor
US20070227009A1 (en) * 2006-03-29 2007-10-04 Andrew Zhuk Razor blades and razors
US20100011584A1 (en) * 2006-08-25 2010-01-21 Bic-Violex Sa Shaving blade unit and shaver having such a blade unit
US20140059862A1 (en) * 2006-08-25 2014-03-06 Bic-Violex Sa Shaving blade unit and shaver having such a blade unit
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US9032627B2 (en) * 2006-08-25 2015-05-19 Bic-Violex Sa Shaving blade unit and shaver having such a blade unit
US20100107425A1 (en) * 2008-05-05 2010-05-06 Eveready Battery Company Inc. Razor Blade and Method of Manufacture
US9248579B2 (en) 2008-07-16 2016-02-02 The Gillette Company Razors and razor cartridges
US20100011590A1 (en) * 2008-07-16 2010-01-21 Depuydt Joseph Allan Razors and razor cartridges
EP2559526A1 (en) * 2008-09-29 2013-02-20 The Gillette Company Razor cartridges with perforated blade assemblies
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WO2010037078A1 (en) * 2008-09-29 2010-04-01 The Gillette Company Razor cartridges with perforated blade assemblies
WO2011071350A2 (en) * 2009-12-11 2011-06-16 Cho Won-Sang Dual blade razor that is easily cleaned and simply assembled
WO2011071350A3 (en) * 2009-12-11 2011-11-24 Cho Won-Sang Dual blade razor that is easily cleaned and simply assembled
WO2012033362A3 (en) * 2010-09-08 2012-06-28 Cho Won-Sang Dual-headed razor for rough shaving and finishing shaving
WO2012033362A2 (en) * 2010-09-08 2012-03-15 Cho Won-Sang Dual-headed razor for rough shaving and finishing shaving
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US20170326744A1 (en) * 2014-03-05 2017-11-16 Mack-Ray Inc. Dual sided razor
US11642805B2 (en) * 2014-03-05 2023-05-09 Mack-Ray Inc. Dual sided razor
US10406706B2 (en) * 2014-03-05 2019-09-10 Mack-Ray Inc. Dual sided razor
US20210268676A1 (en) * 2014-03-05 2021-09-02 Mack-Ray Inc. Dual sided razor
US9505142B2 (en) 2014-09-12 2016-11-29 Rockwell Razors Corporation Modular safety razor with adjustable blade angle
US10807256B2 (en) 2014-09-12 2020-10-20 Rockwell Razors Corporation Modular safety razor with adjustable blade angle
US20160144519A1 (en) * 2014-11-21 2016-05-26 Leaf Shave Company Llc Razor with Pivoting Head
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US10906196B2 (en) * 2014-11-21 2021-02-02 Leaf Shave Company Razor with pivoting head
US20180354147A1 (en) * 2014-12-10 2018-12-13 Haggai Goldfarb Intelligent shaving system having sensors
US11007659B2 (en) * 2014-12-10 2021-05-18 Haggai Goldfarb Intelligent shaving system having sensors
US20160167241A1 (en) * 2014-12-10 2016-06-16 Haggai Goldfarb Intelligent shaving system having sensors
USD774696S1 (en) * 2015-05-15 2016-12-20 Mongoose Razors, Inc. Shaving razor
USD788367S1 (en) * 2015-09-11 2017-05-30 Rockwell Razors Corporation Safety razor base plate
US20170113363A1 (en) * 2015-10-23 2017-04-27 Juan Lopez Adjustable Shaving Device
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US11517509B2 (en) 2016-04-01 2022-12-06 The Procter & Gamble Company Oral care compositions containing a gel network phase
US20220072724A1 (en) * 2016-10-25 2022-03-10 OneBlade, Inc. Single-blade razor apparatus
US11697216B2 (en) * 2016-10-25 2023-07-11 OneBlade, Inc. Single-blade razor apparatus
US11628580B2 (en) * 2016-12-02 2023-04-18 Dorco Co., Ltd. Dual double-edge razor
US20180297220A1 (en) * 2017-04-18 2018-10-18 The Gillette Company Llc Shaving razor system
US11141873B2 (en) 2017-04-18 2021-10-12 The Gillette Company Llc Shaving razor system
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