Razor cartridges

Abstract

Replaceable shaving assemblies are disclosed that include a razor cartridge having a blade geometry that is designed to provide a close, comfortable shave. Shaving systems including such shaving assemblies are also disclosed, as are methods of using such shaving systems and methods of manufacturing these cartridges.

1 . A razor cartridge, comprising:
 a frame defining a base, said frame having an opening defined in part by a composite guard having a leading guard surface and a cap having a trailing cap surface, said leading guard surface and said trailing cap surface cooperating to define a contact plane tangential thereto and extending across said opening; and   at least three razor blades attached to said base, said razor blades being fixedly spaced;   wherein the cutting edge of the razor blade closest to the leading guard surface has a cutting edge exposure relative to said contact plane that is positive; and   wherein the cutting edge exposures of the other razor blades become less positive from said leading composite guard to said cap; and   wherein at least two of the blades have an inter-blade span that is less than about 0.9 mm.   
     
     
         2 . The razor cartridge of  claim 1  wherein said composite guard includes an elastomeric guard bar having a skin contacting surface, and a rigid guard bar support defining said leading guard surface, wherein the rigid guard bar support is proximal to the cutting edge of the razor blade closest to the leading guard surface. 
     
     
         3 . The razor cartridge of  claim 2  wherein the skin contacting surface is higher than an uppermost surface of the rigid guard bar support. 
     
     
         4 . The razor cartridge of  claim 3  wherein the skin contacting surface is higher by about 0.1 to 0.4 mm. 
     
     
         5 . The razor cartridge of  claim 4  wherein the skin contacting surface is higher by about 0.2 to 0.3 mm. 
     
     
         6 . The razor cartridge of  claim 1  wherein the cartridge has a pivot point that is closer to the trailing cap surface than to the leading guard surface. 
     
     
         7 . The razor cartridge of  claim 6  wherein the pivot point is below a lowermost portion of the blades. 
     
     
         8 . (canceled) 
     
     
         9 . The razor cartridge of  claim 1  wherein the inter-blade span is from about 0.75 to 0.85 mm. 
     
     
         10 . The razor cartridge of  claim 1  wherein the distance between a leading edge of the leading guard surface and the cutting edge closest to the leading guard surface is from about 0.3 to 0.75 mm. 
     
     
         11 . The razor cartridge of  claim 1  wherein the distance between a leading edge of the leading guard surface and the cutting edge closest to the leading guard surface is from about 0.35 to 0.45 mm. 
     
     
         12 . The razor cartridge of  claim 1  wherein the blades are bent blades. 
     
     
         13 . The razor cartridge of  claim 1  wherein the blades are fixedly supported within the frame such that the blades do not move relative to the frame during shaving. 
     
     
         14 . A razor cartridge, comprising:
 a frame defining a base, said frame having an opening defined in part by a guard having a leading guard surface and a cap having a trailing cap surface, said leading guard surface and said trailing cap surface cooperating to define a contact plane tangential thereto and extending across said opening; and   at least three razor blades attached to said base, said razor blades being fixedly spaced;   wherein the cutting edge of the razor blade closest to the leading guard surface has a cutting edge exposure relative to said contact plane that is positive; and   wherein the cutting edge exposure of the cutting edges of the other razor blades become less positive from said leading guard surface to said cap, and one or more of said blades has a cutting edge exposure that is negative or neutral; and   wherein at least two of the blades have an inter-blade span that is less than about 0.9 mm.   
     
     
         15 . The razor cartridge of  claim 14  wherein said guard is a composite guard. 
     
     
         16 . The razor cartridge of  claim 15  wherein said composite guard includes an elastomeric guard bar having a skin contacting surface, and a rigid guard bar support defining said leading guard surface, wherein the rigid guard bar support is proximal to the cutting edge of the razor blade closest to the leading guard surface. 
     
     
         17 . The razor cartridge of  claim 16  wherein the skin contacting surface is higher than an uppermost surface of the rigid guard bar support. 
     
     
         18 . The razor cartridge of  claim 14  wherein the cartridge has a pivot point that is closer to the trailing cap surface than to the leading guard surface. 
     
     
         19 . The razor cartridge of  claim 18  wherein the pivot point is below a lowermost portion of the blades. 
     
     
         20 . (canceled) 
     
     
         21 . The razor cartridge of  claim 14  wherein the inter-blade span is from about 0.75 to 0.85 mm. 
     
     
         22 . The razor cartridge of  claim 14  wherein the distance between the leading guard surface and the cutting edge closest to the leading guard surface is from about 0.3 to 0.75 mm. 
     
     
         23 . The razor cartridge of  claim 14  wherein the distance between a leading edge of the leading guard surface and the cutting edge closest to the leading guard surface is from about 0.35 to 0.45 mm. 
     
     
         24 . The razor cartridge of  claim 14  wherein the blades are bent blades. 
     
     
         25 . The razor cartridge of  claim 14  wherein the blades are fixedly supported within the frame such that the blades do not move relative to the frame during shaving. 
     
     
         26 . The razor cartridge of  claim 1  wherein the inter-blade span between each of the blade edges is less than 0.9 mm. 
     
     
         27 . The razor cartridge of  claim 1  wherein the exposure of the razor blade closest to the leading guard surface is positive by at least 0.02 mm. 
     
     
         28 . The razor cartridge of  claim 1  wherein at least five razor blade are attached to said base.