Disposable blade unit

A disposable blade unit for a safety razor comprising a thin, transversely flexible base blade which is apertured along its longitudinal center line and has two parallel, longitudinal edges that are sharpened to cutting edges, the overall width of the blade between its cutting edges being from 0.8 to 1.0 inch,

• a pair of supplemental blades, each said supplemental blade having a planar body portion permanently secured in contact with a planar portion of said base blade, each supplemental blade having a length substantially equal to that of said base blade and a width less than half that of said base blade, each said supplemental blade having a longitudinal edge that is sharpened to a cutting edge positioned parallel to and offset from the adjacent longitudinal edge of said base blade, the edge of each said supplemental blade and the adjacent edge of said base blade defining a set of tandem blade edges, the cutting edges of each said set being spaced apart a distance in the range of 0.03 to 0.08 inch, and
• lower surfaces of said blade unit defining planar support surfaces, one planar support surface being associated with each set of tandem blade edges, one sharpened edge of each set of tandem blade edges being disposed below its associated planar support surface and the other sharpened edge of each set of tandem blade edges being disposed above its associated planar support surface, the blade tangent angle of each said other edge being in the range of 22.degree.-28.degree., and the bisector of the angle between the facet surfaces that defines each sharpened edge being disposed at a downwardly inclined angle of at least 1.degree. to its associated planar support surface.