IP Library › Granted Patent US 8,037,613
Granted Patent B2
US 8,037,613 · App. 10/932,523 · Granted Oct 18, 2011

Shaving head for rotary shaver and method of manufacturing the same

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Quick Facts
Patent No.
US 8,037,613
App. No.
10/932,523
Granted
Oct 18, 2011
Kind
B2
Abstract

A rotary shaving head having a one-piece cup-shaped metal body including a comb portion. A plurality of openings in the comb portion are defined by opposed sidewalls, the intersection of at least one sidewall of at least one of the openings with an inner surface of the comb portion defining a cutting edge having a positive rake angle. A rotary shaving head manufacturing method includes the steps of etching a set of openings corresponding to a shaving head blank into an elongate flat metal strip, forming the blank into a cup-shaped unfinished shaving head, and removing material from the inner surface of the comb portion of the unfinished shaving head.

Claims (13)

1. A shaving head for a rotary shaver, said shaving head comprising:

a one-piece, generally cup-shaped metal body having an internal cavity for receiving a rotary cutter, a comb portion comprising an outer surface for contacting skin to be shaved and an inner surface in part defining the internal cavity, the comb portion having a plurality of openings therein defined by opposed sidewalls having respective generally arcuate surfaces, the comb portion having a thickness in the range of about 0.0025 inches to about 0.0055 inches, the sidewalls generally curving inward toward each other in a concave manner as the openings extend from the outer surface of the comb portion toward the inner surface thereof,

the intersection of at least one sidewall of at least one of said openings with the inner surface of the comb portion of the body defining a cutting edge having a positive rake angle, wherein the shaving head further comprises an annular sidewall depending from the comb portion of said shaving head, the shaving head sidewall having a thickness, the thickness of the comb portion of the shaving head being substantially less than the thickness of said sidewall of said shaving head.

2. The shaving head of claim 1 wherein the openings are chemically etched openings.

3. The shaving head set forth in claim 1 wherein the opposed sidewalls for at least one opening are generally symmetric with each other.

4. The shaving head set forth in claim 1 wherein the opposed sidewalls continuously curve toward each other as the sidewalls extend away from the outer surface of the comb portion.

5. The shaving head set forth in claim 1 wherein the at least one sidewall of said at least one opening has a radius of curvature generally adjacent the cutting edge formed in part by said at least one sidewall of between about 0.004 and about 0.007 inches.

6. The shaving head set forth in claim 5 wherein the radius of curvature is about 0.006 inches.

7. The shaving head set forth in claim 1 wherein said at least one opening has a width at the inner surface of the comb portion in the range of about 0.010 to about 0.011 inches.

8. The shaving head set forth in claim 1 wherein the at least one sidewall of said at least one opening intersects the inner surface of the comb portion at an angle of between about 45 degrees and about 65 degrees.

9. The shaving head set forth in claim 8 wherein said angle is about 55 degrees.

10. The shaving head set forth in claim 1 wherein at least some of the openings are substantially circular.

11. The shaving head set forth in claim 1 wherein the comb portion has a thickness of about 0.003 inches.

Assignments (8)
NOTICE OF SUCCESSOR AGENT AND ASSIGNMENT OF SECURITY INTEREST (INTELLECTUAL PROPERTY) REEL/FRAME 036131/0272 Recorded Jun 5, 2018
From: DEUTSCHE BANK AG NEW YORK BRANCH
To: ROYAL BANK OF CANADA
Reel/Frame 046301/0425 →
SECURITY INTEREST Recorded Jul 20, 2015
From: SPECTRUM BRANDS, INC.
To: DEUTSCHE BANK AG NEW YORK BRANCH, AS COLLATERAL AGENT
Reel/Frame 036131/0272 →
RELEASE OF SECURITY INTEREST Recorded Jul 14, 2015
From: WELLS FARGO BANK, NATIONAL ASSOCIATION, AS COLLATERAL TRUSTEE
To: APPLICA CONSUMER PRODUCTS, INC.; APPLICA CONSUMER PRODUCTS, INC., A CORP. OF FLORIDA; KWIKSET CORPORATION; LIQUID HOLDING COMPANY, INC.; NATIONAL MANUFACTURING CO.; PRICE PFISTER, INC.; ROV HOLDING, INC., A CORP. OF DELAWARE; ROVCAL, INC.; ROVCAL, INC., A CORP. OF CALIFORNIA; RUSSELL HOBBS, INC., A CORP. OF DELAWARE; SALIX ANIMAL HEALTH, LLC; SEED RESOURCES, L.L.C.; SPECTRUM BRANDS, INC.; SPECTRUM BRANDS, INC. AS SUCCESSOR IN INTEREST TO ROVCAL, INC.; SPECTRUM BRANDS, INC., A CORP. OF DELAWARE; TELL MANUFACTURING, INC.; TETRA HOLDING (US), INC., A CORP. OF DELAWARE; TETRA HOLDINGS (US), INC.; UNITED INDUSTRIES CORPORATION; UNITED INDUSTRIES CORPORATION AS SUCCESSOR IN INTEREST TO LIQUID HOLDING COMPANY, INC.; UNITED PET GROUP, INC.; UNITED PET GROUP, INC., A CORP. OF DELAWARE
Reel/Frame 036102/0001 →
PATENT SECURITY AGREEMENT Recorded Dec 28, 2012
From: SPECTRUM BRANDS, INC.; UNITED INDUSTRIES CORPORATION; UNITED PET GROUP, INC.; APPLICA CONSUMER PRODUCTS, INC.; ROVCAL, INC.
To: WELLS FARGO BANK, NATIONAL ASSOCIATION
Reel/Frame 029536/0634 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 14, 2009
From: GOLDMAN SACHS CREDIT PARTNERS L.P.
To: THE BANK OF NEW YORK MELLON, AS COLLATERAL AGENT
Reel/Frame 022951/0236 →
SECURITY AGREEMENT Recorded Jun 27, 2007
From: AQUARIA, INC.; AQUARIUM SYSTEMS, INC.; UNITED PET GROUP, INC.; SPECTRUM BRANDS, INC. (FORMERLY KNOWN AS RAYOVAC CORPORATION); ROVCAL, INC.; SOUTHERN CALIFORNIA FOAM, INC.; TETRA HOLDING (US), INC.; UNITED INDUSTRIES CORPORATION
To: GOLDMAN SACHS CREDIT PARTNERS L.P., AS COLLATERAL AGENT
Reel/Frame 019477/0974 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 21, 2005
From: MURZYNSKI, MACIEJ
To: ROVCAL, INC.
Reel/Frame 016376/0117 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 14, 2004
From: EVERETT, DAVID W., JR.
To: ROVCAL, INC.
Reel/Frame 015461/0884 →