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Publication numberUS3890704 A
Publication typeGrant
Publication dateJun 24, 1975
Filing dateJan 14, 1974
Priority dateJan 14, 1974
Publication numberUS 3890704 A, US 3890704A, US-A-3890704, US3890704 A, US3890704A
InventorsFerraro Frank A
Original AssigneeWarner Lambert Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Razor blade cartridge
US 3890704 A
Abstract
The specific disclosure provides a razor blade cartridge comprising a plastic blade seat member, a blade and a cap member. The seat and the blade have transversely spaced and transversely elongated apertures. The cap has at least two posts extending downwardly through the apertures. The posts initially have an outer longitudinal dimension equal to or greater than the longitudinal dimensions of the apertures, and an outer transverse dimension less than the transverse dimensions of the apertures to provide a longitudinal interference fit of the posts in the apertures. The longitudinal interference fit aligns the blade cutting edge with respect to a transversely elongated guard surface on the seat.
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Description  (OCR text may contain errors)

United States Patent [191 Ferraro June 24, 1975 [73] Assignee: Warner-Lambert (10., Morris Plains,

22 Filed: Jan. 14, 1974 21 Appl. No.: 433,030

[52] US. Cl. 30/47; 30/50; 30/75 [51] Int. Cl. B26B 21/06; B26B 21/22 [58] Field of Search 30/32, 47, 50, 75, 346.58

[56] References Cited UNITED STATES PATENTS 3,675,323 7/1972 Braginetz 30/32 3,703,764 11/1972 Perry 30/47 X 3,724,070 4/1973 Dorion 30/47 Primary Examiner-Al Lawrence Smith Assistant Examiner-Gary L. Smith Attorney, Agent, or FirmJames F. Powers, Jr.; Albert H. Graddis 5 7 ABSTRACT The specific disclosure provides a razor blade cartridge comprising a plastic blade seat member, a blade and a cap member. The seat and the blade have transversely spaced and transversely elongated apertures. The cap has at least two posts extending downwardly through the apertures. The posts initially have an outer longitudinal dimension equal to or greater than the longitudinal dimensions of the apertures, and an outer transverse dimension less than the transverse dimensions of the apertures to provide a longitudinal interference fit of the posts in the apertures. The longitudinal interference fit aligns the blade cutting edge with respect to a transversely elongated guard surface on the seat.

5 Claims, 10 Drawing Figures RAZOR BLADE CARTRIDGE BACKGROUND OF THE INVENTION The present invention relates to safety razors of the type having at least one blade permanently bonded in a replaceable cartridge. More particularly, the present invention relates to means for aligning the cartridge components.

A critical step in assembling razor blade cartridges is to properly align the blade cutting edges with respect to guard surfaces. US. Pat. No. 3,724,070 provides for loosely fitting, blades on posts extending from a cap member through a blade seat member. The blades are then moved forwardly to abut notches in the cap member, and the cartridge is thereafter bonded together by deforming the lower ends of the posts. Such movement of the blades during assembly raises a degree of risk in not properly aligning the blades. Further, there is a danger that the deformed posts will not maintain the blade in a desired location during shipment and use.

SUMMARY OF THE INVENTION In accordance with the present invention, there is provided a razor blade cartridge comprising a plastic seat member, a blade and a cap member. The seat and the blade have transversely spaced and transversely elongated apertures. The cap has at least two posts extending downwardly through the apertures. The posts initially have an outer longitudinal dimension equal to or greater than the longitudinal dimensions of the apertures, and an outer transverse dimension less than the transverse dimensions of the apertures to provide a longitudinal interference fit of the posts in the apertures. The longitudinal interference fit aligns the blade cutting edge with respect to a transversely elongated guard surface on the seat.

The invention is also suitable for aligning more than one blade and spacing means between the cap member and the blade seat member.

Thus, it is clear that the present invention avoids the need for longitudinal movement of the blade(s) after they are located between the cap member and the blade seat member. Further, the blade(s) cannot longitudinally move after the components are bonded together.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a specific embodiment of the present invention;

FIG/2 isa front elevational view of the cartridge;

FIG. 3 isa rear elevational view of the cartridge;

FIG. 4 is a bottom plan view of a cap component of the cartridge; 7 I

FIG. 5 is a front elevational view of the cap member;

FIG. 6 is a top plan view of a blade seat member of the cartridge;

FIG. 7 is a bottom plan view of the blade seat;

FIG. 8 is a cross-sectional view of the cartridge;

FIG. 9 is a top plan view of perforated blade material suitable to form blades for the cartridge,

FIG. 10 is a cross-sectional view taken along line 10-10 of FIG. 5.

DESCRIPTION OF SPECIFIC EMBODIMENTS A razor blade cartridge 10 has a pair of tandemly mounted blades l4, l8 bonded permanently between a cap member and a blade seat member 12. The

blades 14, 18 each have a single cutting edge 38, 39, and are maintained in a vertically separated state by a spacer member 16.

The cartridge 10 has a T-shaped channel 69 (FIG. 8) formed by inwardly directed flange members 70, 71 for releasably securing the cartridge on a holder (not shown).

The spacer member 16 has a rearwardly extending flange 59, and seven spacer elements 55, 58 joined to the flange 59 by vertically extending members 60. The inner spacer elements 55 have beveled forward surfaces 56, 57 which may extend outwardly a slight distance from the top blade cutting edge 38. The spacer elements 55, 58 form shaving residue channels 61 (FIG. 2) which extend rearwardly from between the cutting edges 38, 39 to exit ports 47 49 (FIG. 3) formed at the rear 46 of the cartridge 10. The spacer member 16 also has transversely elongated outer holes 28, 31, and circular inner holes 29, 30.

With reference to FIGS. 4 and 5, the cap member 20 has four posts 22 25 extending downwardly from recesses 50 in the underside of the cap member 20. The cap member 20 also has opposing downwardly extending side walls 53, 54, and a pair of spaced downwardly extending front walls 51, 52.

With reference to FIG. 5, the outer posts 22, 25 have a beveled lower portion 40, an intermediate cylindrical portion 41, an upper cylindrical portion 43, and an upwardly and outwardly beveled intermediate portion 42 interconnecting the intermediate and upper cylindrical portions 41, 43. The inner posts 23, 24 are cylindrical at 45 and have a beveled lower end 44.

With reference to FIG. 1, the blades 14; 18 have a pair of spaced and transversely elongated slots or apertures 26, 27; 32, 33. As clearly shown in FIG. 8, the top blade 18 has a shorter longitudinal length than the bottom blade 14.

Referring now to FIGS. 6 and 7, the blade seat member 12 has a pair of transversely elongated outer holes or perforations 34, 37, and a pair of circular inner perforations 35, 36. Each one of the perforations 34 37 has a beveled upper portion 82 for guiding the lower beveled portions 40, 44 of the posts 22 25 therein.

The blade seat member 12 also has a plateau 62 for seating the bottom blade 14, and a rear step 63 for receiving the flange 59 of the spacer member 16. A guard bar 64 is supported forwardly of the blade seat member 12 by spaced support elements 65. Surfaces 66, 67 extend upwardly from the outer ends of the guard bar 64 to cover the outer corners of the bottom blade cutting edge 39. A boss 68 extends rearwardly from the blade seat member 12, and functions to maintain the cartridge 10 in a dispenser (not shown). The T-shaped channel 69 has a notch 72 formed in the flange member 71 for receiving a holder spring (not shown). Stop members 80, 81 are provided at one end of the T- shaped channel 69 for preventing a holder (not shown) from passing therethrough. US. Pat. No. 3,783,510 discloses a holder and a dispenser suitable for use with the specific embodiment described hereinabove.

The cartridge 10 can be assembled by inverting the cap member 20, and sequentially placing the top blade 18, the spacer member 16, the bottom blade 14 and the blade seat member 12 on the cap member 20 with the posts 22, 23 passing through the aperture or slot 26, the holes 28, 29, the aperture or slot 32 and the perforations 34, 35, and with the posts 24, 25 correspondingly passing through the aperture or slot 27, the holes 30, 3 l, the aperture or slot 33 and the perforations 36, 37. The lower ends of the posts 22 25 are stacked or otherwise deformed at the lower ends thereof as shown in FIGS. 7 and 8 to permanently bond the components together. The cap member 20, the blades 14, 18 and the spacer member 16 have cut-out portions for receiving alignment members (not shown) during assembly. After the cartridge is stacked, the alignment members are removed.

The intermediate cylindrical portions 41 of the outer posts 22, 25 are dimensioned to have a close longitudinal fit in the blade apertures 26, 27, 32, 33, the spacer outer holes 28, 31 and the blade seat outer perforations 34, 37. The intermediate cylindrical portions 41 may have a longitudinal dimension equal to the longitudinal dimension of the bottom blade apertures 32, 33 to provide an interference fit.

The intermediate beveled portions 42 of the outer posts 22, 25 serve to gradually increase the longitudinal dimensions of the posts 22, 25 such that the upper cylindrical portions 43 have a longitudinal interference fit in the blade apertures 26, 27, 32, 33 and the blade seat perforations 34, 37, and a very close fit in the outer spacer holes 28, 31. The inner posts 23, 24 have a close fit through the blade apertures 26, 27, 32, 33, the inner spacer holes 29, 30 and the inner blade seat perforations 35, 36.

The following table provides suitable dimensions for the posts 22 25, the apertures 26, 27, 32, 33, the holes 28 31 and the perforations 34 37.

Perforations 35. 36 (diameter) The transverse dimensions of the blade apertures or slots 26, 27, 32, 33, the outer spacer holes 28, 31 and the outer seat perforations 34, 37 are greater than the diameters of the outer posts 22, 25 to provide deformation of the outer posts 22, 25 in a transverse direction as interference fitting occurs in a longitudinal direction, and thereby provide alignment of the cutting edges 38, 39 with respect to the guard bar 64.

FIG. 9 shows a perforated strip of blade material having cutting edges 38, 39 formed on the outer sides. The strip is cut along the dashed lines to provide the top and bottom blades 14, 18, and the portions 96 are discardedor recycled.

What is claimed is:

1. A razor blade cartridge comprising:

a. a plastic blade seat member including a transversely elongated guard surface defining a front surface of said blade seat member, and at least two transversely spaced perforations therethrough, each one of said perforations being transversely elongated and having a first longitudinal dimension;

b. a first blade located on said blade seat member including a forward cutting edge spaced upwardly and rearwardly of said guard surface, and at least two transversely spaced apertures, each one of said first blade apertures being transversely elongated and having a second longitudinal dimension greater than said first dimension;

c. a spacer member located on said first blade including at least two transversely spaced holes;

(1. a second blade located on said spacer member including a forward cutting edge spaced upwardly and rearwardly of the forward cutting edge of said first blade, and at least two transversely spaced apertures, each one of said second blade apertures being transversely elongated and having a third longitudinal dimension greater than said second dimension; and

e. a cap member located above said second blade and including at least two plastic posts extending downwardly through said aperture s, said holes and said perforations, said posts initially having a longitudinal outer dimension equal to or greater than the longitudinal dimensions of said apertures and said perforations to provide a longitudinal interference fit of said posts in said apertures and said perforations.

2. The cartridge of claim 1 wherein said spacer member holes are transversely elongated.

3. The cartridge of claim 1 wherein each one of said posts has a lower cylindrical portion and an upper cylindrical portion, the diameter of said upper cylindrical portion being greater than the diameter of said lower cylindrical portion.

4. The cartridge of claim 3 wherein each one of said posts has an upwardly and outwardly beveled portion interconnecting said upper and lower cylindrical portions.

5. The cartridge of claim 1 wherein said posts are deformed at the lower ends thereof to prevent removal of said posts from said perforations.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3675323 *Jul 18, 1969Jul 11, 1972Philip Morris IncDisposable preassembled plastic razor
US3703764 *Mar 15, 1971Nov 28, 1972Gillette CoRazor blade assembly
US3724070 *Mar 15, 1971Apr 3, 1973Gillette CoDual razor blade assembly
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4016648 *Aug 13, 1975Apr 12, 1977Warner-Lambert CompanySafety razor
US4574476 *Feb 13, 1985Mar 11, 1986Warner-Lambert CompanyRazor blade assembly
US4679324 *Nov 7, 1985Jul 14, 1987The Gillette CompanySafety razor blades
US4866844 *Mar 11, 1988Sep 19, 1989Warner-Lambert CompanyRazor head assembly
US5060377 *Aug 15, 1990Oct 29, 1991Wilkinson Sword GmbhShaver head with flow passages
US5232568 *Jun 24, 1991Aug 3, 1993The Gillette CompanyRazor technology
US5276967 *Apr 29, 1993Jan 11, 1994Warner-Lambert CompanyFlexible razor unit employing corrugated spacer
US5331740 *Oct 8, 1992Jul 26, 1994The Gillette CompanyShaving system
US5347714 *Feb 18, 1993Sep 20, 1994American Safety Razor CompanyMovable blade shaving cartridge
US5365665 *Mar 5, 1993Nov 22, 1994Warner-Lambert CompanyRazor head with flow passages
US5373638 *Apr 30, 1993Dec 20, 1994Warner-Lambert CompanyRazor head, especially razor blade unit of a wet razor
US5388332 *Oct 11, 1991Feb 14, 1995The Gillette CompanyRazor blade units and blade spacers therefor
US5517760 *Jun 23, 1993May 21, 1996American Safety Razor CompanyMovable blade shaving cartridge or the like
US5526567 *Apr 14, 1995Jun 18, 1996The Gillette CompanyShaving system
US6769180Jul 1, 2002Aug 3, 2004Eveready Battery Company, Inc.Shaving implement having static and dynamic blades
US8814881 *Dec 13, 2007Aug 26, 2014Zimmer Surgical, Inc.Dermatome with orientation guides
US8926632Jun 8, 2011Jan 6, 2015Zimmer Surgical, Inc.Dermatome swivel double acting valve
CN1053138C *Oct 8, 1993Jun 7, 2000吉莱特公司Razor system
DE2636534A1 *Aug 13, 1976Feb 17, 1977Warner Lambert CoSicherheitsrasierapparat und klingenblock dafuer
DE2746372A1 *Oct 14, 1977Apr 20, 1978Warner Lambert CoSicherheitsrasierer
DE4303865A1 *Feb 10, 1993Sep 16, 1993Wilkinson Sword GmbhTitle not available
DE4309437A1 *Mar 24, 1993Nov 4, 1993Wilkinson Sword GmbhRazor blade unit for wet razor
DE8909759U1 *Aug 16, 1989Dec 20, 1990Wilkinson Sword Gmbh, 5650 Solingen, DeTitle not available
DE9205955U1 *May 2, 1992Sep 9, 1993Wilkinson Sword GmbhRasierapparatekopf, insbesondere Rasierklingeneinheit eines Na▀rasierapparates
EP0331831A1 *Apr 19, 1988Sep 13, 1989Warner-Lambert CompanyRazor head
EP0894582A1 *Sep 27, 1993Feb 3, 1999The Gillette CompanyFixed head disposable razor
WO1992006828A1 *Oct 11, 1991Apr 23, 1992Gillette CoRazor blade units and blade spacers therefor
WO1994008761A1 *Sep 27, 1993Apr 28, 1994Gillette CoFixed head disposable razor
Classifications
U.S. Classification30/47, 30/75, 30/50
International ClassificationB26B21/22, B26B21/08, B26B21/06, B26B21/00
Cooperative ClassificationB26B21/06, B26B21/222
European ClassificationB26B21/22A, B26B21/06